CN108311686B - Adjustable hydraulic ram device - Google Patents
Adjustable hydraulic ram device Download PDFInfo
- Publication number
- CN108311686B CN108311686B CN201810456142.7A CN201810456142A CN108311686B CN 108311686 B CN108311686 B CN 108311686B CN 201810456142 A CN201810456142 A CN 201810456142A CN 108311686 B CN108311686 B CN 108311686B
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- China
- Prior art keywords
- cantilever
- sleeve
- clamping
- punch
- guide groove
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- 239000000725 suspension Substances 0.000 claims 2
- 238000009434 installation Methods 0.000 abstract description 10
- 239000002893 slag Substances 0.000 abstract description 10
- 238000005266 casting Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an adjustable hydraulic punch device, which comprises a punch mechanism, a cantilever mechanism, a sleeve mechanism and a hydraulic system, wherein the punch mechanism is used for realizing efficient slag removal and can be quickly disassembled and assembled; the cantilever mechanism is used for realizing the axial and circumferential position adjustment of the punch rod and can be rapidly positioned and clamped; the sleeve mechanism is used for controlling the lifting movement and the guiding positioning of the plunger and the cantilever; the hydraulic system realizes the rapid movement and impact force adjustment of the whole device. The adjustable hydraulic punch device can adjust the axial and circumferential positions of punch installation, rapidly position and clamp, simultaneously can adjust the speed and impact force of the punch, realizes rapid large-impact-force slag removal operation, and has the characteristics of convenient installation and disassembly, long service life and the like.
Description
Technical Field
The invention relates to an adjustable hydraulic ram device.
Background
The automatic pouring system solves the requirements of modern casting on mass production and high productivity. In an automatic pouring system, slag removal operation of a pouring ladle nozzle of a pouring machine is completed by a plunger device, and the quality of slag removal effect of the plunger device has great influence on pouring efficiency and quality. The high-efficiency plunger rod device of the casting machine is required to be fast and adjustable, has large impact force, reliable structure, convenient installation and disassembly and long service life. At present, the punch rod device of the automatic casting machine sold in the market cannot meet the use demands of people.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an adjustable hydraulic punch device which can be used for adjusting the axial and circumferential positions of punch installation and rapidly positioning and clamping, and simultaneously can be used for adjusting the speed and impact force of the punch to realize rapid slag removal operation with large impact force, and has the characteristics of convenience in installation and disassembly, long service life and the like.
The technical scheme for achieving the purpose is as follows: an adjustable hydraulic ram device, includes ram mechanism, cantilever mechanism, sleeve mechanism and hydraulic system, wherein:
the punch rod mechanism comprises a handle, a punch rod body and a spiral punch rod head which are sequentially connected from top to bottom;
the cantilever mechanism comprises an outer cantilever, an inner cantilever, a first clamping clamp, a second clamping clamp, a first clamping bolt and a second clamping bolt, and the outer cantilever is transversely arranged; the inner cantilever is inserted into the outer cantilever in a manner of being capable of moving left and right; the first clamping pliers are arranged at the left end of the inner cantilever, and the handle of the punch rod mechanism is fixed in the first clamping pliers; the outer cantilever arm is clamped on the inner cantilever arm through the second clamping pliers and the first clamping bolt; the right end of the outer cantilever is welded with a vertical cylinder, and the outer wall surface of the vertical cylinder is welded with a circular arc-shaped guide groove along the circumferential direction of the outer wall surface of the vertical cylinder; the second clamping bolt is arranged in the circular arc-shaped guide groove and moves along the circular arc-shaped guide groove;
the sleeve mechanism comprises an outer sleeve, an inner sleeve, a wear-resistant bushing and a hydraulic cylinder joint; the outer sleeve is vertically arranged; the inner sleeve is arranged in the outer sleeve in a vertically movable manner; the wear bushing is disposed between the inner sleeve and the outer sleeve; the vertical cylinder is sleeved at the top of the inner sleeve, a guide groove fixing plate matched with the circular arc guide groove is arranged on the outer wall of the inner sleeve, and the circular arc guide groove and the guide groove fixing plate are fixed together through the second clamping bolt; a guide plate is arranged on the outer wall of the inner sleeve along the axial direction of the inner sleeve, the guide plate is pressed by a roller, and the guide plate is positioned below the guide groove fixing plate; a joint mounting plate is transversely arranged in the inner sleeve; the hydraulic cylinder joint is fixed on the joint mounting plate;
the hydraulic system comprises a hydraulic station, a hydraulic cylinder and a control valve group, wherein the hydraulic station is connected with the hydraulic cylinder through the control valve group, the hydraulic cylinder is arranged in the inner sleeve and positioned below the joint mounting plate, and the cylinder head of the hydraulic cylinder is connected with the joint of the hydraulic cylinder.
The adjustable hydraulic punch device is characterized in that the handle is provided with two positioning plates one above the other, and the first clamping pliers are located between the two positioning plates.
The adjustable hydraulic punch device is characterized in that a circular ring is arranged at the top end of the handle.
The second clamping pliers comprise a pliers seat and a contact rod, wherein the pliers seat is fixed at the left end of the outer cantilever, and a contact rod mounting hole is formed in the wall surface of the outer cantilever; one end of the abutting rod is connected with the clamp seat, and the other end of the abutting rod penetrates through the abutting rod mounting hole to abut against the inner cantilever;
the wall surface of the outer cantilever is provided with a bolt sliding groove along the axial direction; the first clamping bolt is arranged in the bolt sliding groove, and the first clamping bolt is connected with the inner cantilever.
According to the adjustable hydraulic ram device, the abutment rods and the first clamping bolts are located on two radial sides of the outer sleeve in a one-to-one correspondence mode.
The adjustable hydraulic punch device, wherein the radian of the circular arc-shaped guide groove is smaller than or equal to 60 degrees.
The adjustable hydraulic punch device is characterized in that the bottom end of the outer sleeve is welded with the base.
The adjustable hydraulic punch device comprises a connector mounting plate, wherein the connector mounting plate is circular, and the diameter of the connector mounting plate is matched with the inner diameter of the inner sleeve.
The adjustable hydraulic ram device is characterized in that a bottom plate is arranged at the bottom of the hydraulic cylinder.
The adjustable hydraulic ram device comprises a control valve group, a speed control valve and a pressure control valve.
The adjustable hydraulic punch device can adjust the axial and circumferential positions of punch installation, rapidly position and clamp, simultaneously can adjust the speed and impact force of the punch, realizes rapid large-impact-force slag removal operation, and has the characteristics of convenient installation and disassembly, long service life and the like.
Drawings
FIG. 1 is a front view of an adjustable hydraulic ram apparatus of the present invention;
FIG. 2 is a block diagram of a ram mechanism of the adjustable hydraulic ram apparatus of the present invention;
FIG. 3a is a front view of the cantilever mechanism of the adjustable hydraulic ram apparatus of the present invention;
FIG. 3b is a top view of the cantilever mechanism of the adjustable hydraulic ram apparatus of the present invention;
fig. 4 is a structural view of a sleeve mechanism of the adjustable hydraulic ram apparatus of the present invention.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the following detailed description is provided with reference to the accompanying drawings:
referring to fig. 1 to 4, an adjustable hydraulic ram device according to a preferred embodiment of the present invention includes a ram mechanism 1, a cantilever mechanism 2, a sleeve mechanism 3, and a hydraulic system. The punch rod mechanism 1 is connected with the sleeve mechanism 3 through the cantilever mechanism 2, and the hydraulic system is connected with the sleeve mechanism 3.
Referring to fig. 2 again, the plunger mechanism 1 includes a handle 11, a plunger body 12 and a screw plunger head 13 sequentially connected from top to bottom, and the plunger head adopts a screw structure for improving the slag removal efficiency. Two positioning plates 14 are arranged on the handle 11 one above the other for quick positioning of the connection between the punch mechanism 1 and the cantilever mechanism 2. The top of the handle 11 is provided with a circular ring 15 which is convenient for the operator to grasp the punch.
Referring to fig. 3a and 3b again, the cantilever mechanism 2 includes an outer cantilever 21, an inner cantilever 22, a first clamping jaw 23, a second clamping jaw 24, a first clamping bolt 25 and a second clamping bolt 26, the outer cantilever 21 being disposed laterally; the inner cantilever 22 is inserted into the outer cantilever 21 in a manner of moving left and right; the first clamping pliers 23 are arranged at the left end of the inner cantilever 22, the handle 11 of the punch mechanism 1 is fixed in the first clamping pliers 23, and the first clamping pliers 23 are positioned between the two positioning plates 14, so that the punch mechanism 1 and the cantilever mechanism 2 can be rapidly clamped and fixed together; the outer cantilever 21 is clamped on the inner cantilever 22 through the second clamping pliers 24 and the first clamping bolt 25, specifically, the second clamping pliers 24 comprise a pliers seat and a contact supporting rod 241, the pliers seat is fixed at the left end of the outer cantilever 31, the wall surface of the outer cantilever 21 is provided with a contact supporting rod mounting hole 210, one end of the contact supporting rod 241 is connected with the pliers seat, the other end of the contact supporting rod 241 passes through the contact supporting rod mounting hole 210 and is in contact with the inner cantilever 22, the wall surface of the outer cantilever 21 is provided with a bolt sliding groove 29 along the axial direction thereof, the first clamping bolt 25 is arranged in the bolt sliding groove 29 and is connected with the inner cantilever 22, when the inner cantilever 22 moves left and right along the outer cantilever 21, the contact supporting rod 241 and the first clamping bolt 25 are positioned at two radial sides of the outer sleeve 21 in a one-to-one correspondence manner, and the outer cantilever 21 and the inner cantilever 22 are fast clamped and fixed through the second clamping pliers 24 and the first clamping bolt 25; the right end of the outer cantilever 21 is welded with a vertical cylinder 27, and the outer wall surface of the vertical cylinder 27 is welded with a circular arc-shaped guide groove 28 along the circumferential direction; the second clamping bolt 26 is arranged in the circular arc-shaped guide groove 28 and moves along the circular arc-shaped guide groove 28, the circular arc-shaped guide groove 28 is used for adjusting the circumferential position of the punch rod, and the adjusting range is 60 degrees, namely the radian of the circular arc-shaped guide groove 28 is smaller than or equal to 60 degrees. The inner cantilever 22 can move left and right along the outer cantilever 21 and can be used for adjusting the left and right positions of the punch rod, and after the adjustment, the inner cantilever and the outer cantilever are rapidly clamped and fixed through the second clamping pliers 24 and the first clamping bolt 25.
Referring again to fig. 4, the sleeve mechanism 3 includes an outer sleeve 31, an inner sleeve 32, a wear bushing 33, and a cylinder head 34; the outer sleeve 31 is vertically arranged; the inner sleeve 32 is provided inside the outer sleeve 31 so as to be movable up and down; the wear-resistant bush 33 is arranged between the inner sleeve 32 and the outer sleeve 31, the inner sleeve 32 and the outer sleeve 31 are positioned and guided by the wear-resistant bush 33, and the wear-resistant bush 33 is made of wear-resistant materials so as to improve the service life; the vertical cylinder 27 of the cantilever mechanism 2 is sleeved on the top of the inner sleeve 32, a guide groove fixing plate 35 matched with the circular arc guide groove 28 is arranged on the outer wall of the inner sleeve 32, and the circular arc guide groove 28 and the guide groove fixing plate 35 are fixed together through a second clamping bolt 26, so that the cantilever mechanism 2 is connected with the sleeve mechanism 3; a guide plate 36 is arranged on the outer wall of the inner sleeve 32 along the axial direction of the inner sleeve, the guide plate 36 is pressed by a roller 37 and is used for positioning the inner sleeve 32 in the circumferential direction and guiding the inner sleeve in the axial direction, and the guide plate 36 is positioned below the guide groove fixing plate 35; a splice mounting plate 38 is transversely disposed within the inner sleeve 32; the cylinder head 34 is secured to a head mounting plate 38. The connector mounting plate 38 is circular in shape and the diameter of the connector mounting plate 38 is adapted to the inner diameter of the inner sleeve 32. The bottom end of the outer sleeve 31 is welded with a base 39, and in use, the outer sleeve 31 is secured to the casting machine apparatus by the base 39.
The hydraulic system comprises a hydraulic station, a hydraulic cylinder 4 and a control valve group, wherein the hydraulic station is connected with the hydraulic cylinder 4 through the control valve group, the hydraulic cylinder 4 is arranged in the inner sleeve 32, the hydraulic cylinder 4 is positioned below the joint mounting plate 38, and the cylinder head of the hydraulic cylinder 4 is connected with the hydraulic cylinder joint 34 and used for pushing the inner sleeve 32 to move up and down along the outer sleeve 31. The bottom of the hydraulic cylinder 4 is provided with a bottom plate, and when in use, the hydraulic cylinder 4 is fixed on casting machine equipment through the bottom plate. The control valve group includes a directional control valve, a speed control valve, and a pressure control valve for controlling the speed and pressure of the movement of the hydraulic cylinder 4.
In the adjustable hydraulic punch device, a cantilever mechanism 2 is used for installing a punch mechanism 1 and is connected with a sleeve mechanism 3. The cantilever mechanism 2 is used for axial and circumferential adjustment of the position of the punch mechanism 1 and fixedly clamping the punch mechanism 1. The sleeve mechanism 3 is mounted below the cantilever mechanism 2. A base is welded to the bottom end of the outer sleeve 31 for mounting on casting machine equipment. The sleeve mechanism 3 serves to control the movement and guiding of the ram mechanism. The hydraulic system drives the sleeve mechanism and thus the punch mechanism 1. At the time of installation, the axial and circumferential positions of the punch mechanism 1 can be adjusted and locked quickly by adjusting the cantilever mechanism 2. When the casting machine works, the speed and impact force of the slag removal action of the punch mechanism 1 can be adjusted by adjusting the control valve of the hydraulic system.
The adjustable hydraulic punch device is characterized in that a punch mechanism 1 is used for realizing efficient slag removal and can be quickly assembled and disassembled; the cantilever mechanism 2 is used for realizing the axial and circumferential position adjustment of the punch rod and can be rapidly positioned and clamped; the sleeve mechanism 3 is used for controlling the lifting movement and the guiding positioning of the punch rod and the cantilever; the hydraulic system realizes the rapid movement and impact force adjustment of the whole device.
In summary, the adjustable hydraulic punch device provided by the invention can be used for adjusting the axial and circumferential positions of punch installation and rapidly positioning and clamping, and simultaneously can be used for adjusting the speed and impact force of the punch, so that rapid large-impact-force slag removal operation is realized, and the adjustable hydraulic punch device has the characteristics of convenience in installation and disassembly, long service life and the like.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (10)
1. The utility model provides an adjustable hydraulic ram device which characterized in that, includes ram mechanism, cantilever mechanism, sleeve mechanism and hydraulic system, wherein:
the punch rod mechanism comprises a handle, a punch rod body and a spiral punch rod head which are sequentially connected from top to bottom;
the cantilever mechanism comprises an outer cantilever, an inner cantilever, a first clamping clamp, a second clamping clamp, a first clamping bolt and a second clamping bolt, and the outer cantilever is transversely arranged; the inner cantilever is inserted into the outer cantilever in a manner of being capable of moving left and right; the first clamping pliers are arranged at the left end of the inner cantilever, and the handle of the punch rod mechanism is fixed in the first clamping pliers; the outer cantilever arm is clamped on the inner cantilever arm through the second clamping pliers and the first clamping bolt; the right end of the outer cantilever is welded with a vertical cylinder, and the outer wall surface of the vertical cylinder is welded with a circular arc-shaped guide groove along the circumferential direction of the outer wall surface of the vertical cylinder; the second clamping bolt is arranged in the circular arc-shaped guide groove and moves along the circular arc-shaped guide groove;
the sleeve mechanism comprises an outer sleeve, an inner sleeve, a wear-resistant bushing and a hydraulic cylinder joint; the outer sleeve is vertically arranged; the inner sleeve is arranged in the outer sleeve in a vertically movable manner; the wear bushing is disposed between the inner sleeve and the outer sleeve; the vertical cylinder is sleeved at the top of the inner sleeve, a guide groove fixing plate matched with the circular arc guide groove is arranged on the outer wall of the inner sleeve, and the circular arc guide groove and the guide groove fixing plate are fixed together through the second clamping bolt; a guide plate is arranged on the outer wall of the inner sleeve along the axial direction of the inner sleeve, the guide plate is pressed by a roller, and the guide plate is positioned below the guide groove fixing plate; a joint mounting plate is transversely arranged in the inner sleeve; the hydraulic cylinder joint is fixed on the joint mounting plate;
the hydraulic system comprises a hydraulic station, a hydraulic cylinder and a control valve group, wherein the hydraulic station is connected with the hydraulic cylinder through the control valve group, the hydraulic cylinder is arranged in the inner sleeve and positioned below the joint mounting plate, and the cylinder head of the hydraulic cylinder is connected with the joint of the hydraulic cylinder.
2. An adjustable hydraulic ram apparatus according to claim 1, wherein the handle is provided with two positioning plates one above the other, the first clamping jaw being located between the two positioning plates.
3. An adjustable hydraulic ram apparatus according to claim 1 or claim 2, wherein the top end of the handle is provided with a circular ring.
4. The adjustable hydraulic ram device according to claim 1, wherein the second clamping pliers comprise pliers bases and abutting rods, the pliers bases are fixed at the left ends of the outer suspension arms, and abutting rod mounting holes are formed in the wall surfaces of the outer suspension arms; one end of the abutting rod is connected with the clamp seat, and the other end of the abutting rod penetrates through the abutting rod mounting hole to abut against the inner cantilever;
the wall surface of the outer cantilever is provided with a bolt sliding groove along the axial direction; the first clamping bolt is arranged in the bolt sliding groove, and the first clamping bolt is connected with the inner cantilever.
5. The adjustable hydraulic ram apparatus of claim 4, wherein the abutment bar and the first clamping bolt are located on either radial side of the outer sleeve in a one-to-one correspondence.
6. An adjustable hydraulic ram apparatus according to claim 1, wherein the arcuate channel has an arc of less than or equal to 60 degrees.
7. An adjustable hydraulic ram apparatus according to claim 1, wherein the bottom end of the outer sleeve is welded with a base.
8. The adjustable hydraulic ram apparatus of claim 1, wherein the connector mounting plate is circular, and wherein the diameter of the connector mounting plate is adapted to the inner diameter of the inner sleeve.
9. An adjustable hydraulic ram apparatus according to claim 1, wherein the bottom of the hydraulic cylinder is provided with a bottom plate.
10. An adjustable hydraulic ram apparatus according to claim 1, wherein the control valve block comprises a directional control valve, a speed control valve and a pressure control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810456142.7A CN108311686B (en) | 2018-05-14 | 2018-05-14 | Adjustable hydraulic ram device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810456142.7A CN108311686B (en) | 2018-05-14 | 2018-05-14 | Adjustable hydraulic ram device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108311686A CN108311686A (en) | 2018-07-24 |
| CN108311686B true CN108311686B (en) | 2024-02-02 |
Family
ID=62896572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810456142.7A Active CN108311686B (en) | 2018-05-14 | 2018-05-14 | Adjustable hydraulic ram device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108311686B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011118538A1 (en) * | 2011-11-15 | 2013-05-16 | Otto Ganter Gmbh & Co. Kg Normteilefabrik | Quick clamping device for clamping workpieces in work bench, has plate adjustably accommodated in inner thread of sleeve, where sleeve is twisted against lever legs by clamping screw that is arranged at upper side of sleeve |
| CN204396858U (en) * | 2015-01-12 | 2015-06-17 | 山东球墨铸铁管有限公司 | A kind of ladle scarfing cinder disintegrating machine |
| CN104923774A (en) * | 2015-07-07 | 2015-09-23 | 云南云铝润鑫铝业有限公司 | Automatic slag removal machine for ingot casting |
| CN204868625U (en) * | 2015-08-14 | 2015-12-16 | 安阳钢铁股份有限公司 | Quick replacement diffuses device of valve |
| CN206066480U (en) * | 2016-09-18 | 2017-04-05 | 盛富春 | A kind of molten metal scarfing cinder mechanical hand |
| CN106955995A (en) * | 2017-05-05 | 2017-07-18 | 应达工业（上海）有限公司 | A kind of adjustable type stopper rod mechanism controls device |
| CN107900322A (en) * | 2017-12-29 | 2018-04-13 | 烟台盛利达工程技术有限公司 | A kind of combined type slag removing mechanism and clinker removal method |
| CN208374200U (en) * | 2018-05-14 | 2019-01-15 | 应达工业（上海）有限公司 | A kind of adjustable type hydraulic punch lever apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9086242B2 (en) * | 2013-03-15 | 2015-07-21 | Nucor Corporation | Slag clearing system and method |
-
2018
- 2018-05-14 CN CN201810456142.7A patent/CN108311686B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011118538A1 (en) * | 2011-11-15 | 2013-05-16 | Otto Ganter Gmbh & Co. Kg Normteilefabrik | Quick clamping device for clamping workpieces in work bench, has plate adjustably accommodated in inner thread of sleeve, where sleeve is twisted against lever legs by clamping screw that is arranged at upper side of sleeve |
| CN204396858U (en) * | 2015-01-12 | 2015-06-17 | 山东球墨铸铁管有限公司 | A kind of ladle scarfing cinder disintegrating machine |
| CN104923774A (en) * | 2015-07-07 | 2015-09-23 | 云南云铝润鑫铝业有限公司 | Automatic slag removal machine for ingot casting |
| CN204868625U (en) * | 2015-08-14 | 2015-12-16 | 安阳钢铁股份有限公司 | Quick replacement diffuses device of valve |
| CN206066480U (en) * | 2016-09-18 | 2017-04-05 | 盛富春 | A kind of molten metal scarfing cinder mechanical hand |
| CN106955995A (en) * | 2017-05-05 | 2017-07-18 | 应达工业（上海）有限公司 | A kind of adjustable type stopper rod mechanism controls device |
| CN107900322A (en) * | 2017-12-29 | 2018-04-13 | 烟台盛利达工程技术有限公司 | A kind of combined type slag removing mechanism and clinker removal method |
| CN208374200U (en) * | 2018-05-14 | 2019-01-15 | 应达工业（上海）有限公司 | A kind of adjustable type hydraulic punch lever apparatus |
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| Publication number | Publication date |
|---|---|
| CN108311686A (en) | 2018-07-24 |
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