CN111119888B - Machine-mounted splitting machine for hard stones - Google Patents
Machine-mounted splitting machine for hard stones Download PDFInfo
- Publication number
- CN111119888B CN111119888B CN202010101888.3A CN202010101888A CN111119888B CN 111119888 B CN111119888 B CN 111119888B CN 202010101888 A CN202010101888 A CN 202010101888A CN 111119888 B CN111119888 B CN 111119888B
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- splitting
- block
- machine
- cylinder body
- groove
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- 239000004575 stone Substances 0.000 title claims abstract description 48
- 230000000903 blocking effect Effects 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims description 3
- 230000004886 head movement Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 238000010030 laminating Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 239000010720 hydraulic oil Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/02—Other methods or devices for dislodging with or without loading by wedges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
- B28D1/222—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising by pressing, e.g. presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
Abstract
The invention relates to the technical field of splitting machines, and discloses a machine-mounted splitting machine for hard stones, which comprises a hydraulic cylinder and a splitting gun, wherein the bottom of the hydraulic cylinder is movably provided with the splitting gun, the hydraulic cylinder comprises a cylinder body, the inner ring of the cylinder body is movably provided with a plunger push rod at the top of a limiting ring, the inner ring at the bottom of the cylinder body is movably sleeved with the splitting gun, the splitting gun comprises four identical splitting blocks, each splitting block comprises a block body, the inner side surface of the block body is an inclined surface, one side of the block body is movably provided with a blocking block, the middle part of the inner side of the blocking block body is fixedly provided with a magnet, the other side of the block body is provided with an arc surface groove matched with the blocking block in shape and size, the outer surface of the arc surface groove is provided with a magnet groove matched with the magnet in shape and size, the splitting machine is provided with the splitting gun in a full, the effect of uniform splitting around is realized, and the service life is prolonged.
Description
Technical Field
The invention relates to the technical field of splitting machines, in particular to a machine-mounted splitting machine for hard stones.
Background
Often need handle hard stone for the stone of broken one-tenth fritter when carrying out rock mining or construction etc, the equipment that adopts at this in-process adopts the splitting machine more, because the splitting machine is a plurality of simultaneous workings, and itself is also very heavy, so most all adopt the machine-carried formula, the splitting machine danger coefficient is little, safety ring protects, current splitting machine adopts a voussoir and two pieces of splitting to constitute, promote the voussoir downwards through hydraulic pressure and break the piece to both sides extrusion, thereby it produces the crack to split the piece to act on the stone head to both sides under the effect of force with monoblock stone splitting, but the splitting machine still has some problems:
1. the position of splitting gun is required to be adjusted according to the required splitting direction before splitting is carried out by the existing splitting machine, acting force can only be generated towards two sides by a splitting block, so that more time can be consumed when the splitting is carried out, meanwhile, the splitting effect caused by the splitting is only on one line, the force acting by a hydraulic device is not completely acted on a stone head, on one hand, the splitting effect is poor or the splitting direction cannot meet the requirement, on the other hand, the waste of the acting force is caused, the generated hydraulic force is very large, and resources are wasted when the hydraulic device is not fully utilized.
2. A space can exist between the wedge block and the splitting block of the splitting machine when the wedge block and the splitting block are opened and closed, small stones and the like can be easily clamped into the space, so that the wedge block or the splitting block can be deformed due to the fact that the stones are clamped in the middle when subsequent splitting is carried out, equipment damage and the like are caused, the service life of the equipment is shortened, and splitting cost is improved.
Disclosure of Invention
Aiming at the defects of the background technology, the invention provides the machine-mounted splitter for the hard stone, which has the advantages of good splitting effect and long service life and solves the problems in the background technology.
The invention provides the following technical scheme: a machine-carried type splitting machine for hard stones comprises a hydraulic cylinder and a splitting gun, wherein the bottom of the hydraulic cylinder is movably provided with the splitting gun, the hydraulic cylinder comprises a cylinder body, the top of the cylinder body is provided with an oil inlet, the inner ring of the cylinder body is fixedly provided with a limiting ring, the inner ring of the cylinder body is positioned at the top of the limiting ring and is movably provided with a plunger push rod, the bottom inner ring of the cylinder body is movably sleeved with the splitting gun, the splitting gun comprises four identical splitting blocks, the four splitting blocks are jointed to form a cylinder, each splitting block comprises a block body, the inner side surface of the block body is an inclined plane, the inclined plane is in a trapezoid shape with a large top and a small bottom, the top of the block body is fixedly provided with a clamping sliding head, the outer side of the clamping sliding head is movably sleeved at the bottom of the inner ring of the cylinder body through the sliding head, the inboard middle part fixed mounting of fender piece has magnet, the opposite side of block is seted up with the cambered surface groove of fender piece shape size looks adaptation, the magnet groove with magnet shape size looks adaptation is seted up to the surface in cambered surface groove, the rotation spacing groove has been seted up with the fender piece junction to the inside of block, one side of fender piece stretches into and rotates the spacing inslot, circular activity groove has been seted up to the bottom of plunger push rod, the voussoir has been cup jointed in the activity inslot activity, the bottom of voussoir is positive toper platform form, and the inclined plane slope degree of the inclined plane of toper platform and block is the same.
Preferably, the distance from the limiting ring to the wedge block is the same as that from the inner wall of the movable groove to the wedge block.
Preferably, the joint slips the head and is the C font of outside open-ended, conical spring connects between the C font diapire of joint slips the head and the inner wall of cylinder body, and the great one end of conical spring connects on the inner wall of cylinder body.
Preferably, the cambered surface groove is made of hard alloy materials capable of being adsorbed by the magnet.
Preferably, the end part of the outer side of the stone blocking block is arc-shaped.
Preferably, the angle of 5 degrees exists between the both sides face that the stone stopping block is located the inside one end of rotation spacing inslot.
The invention has the following beneficial effects:
1. the splitting gun of the whole circle form is formed by setting four splitting blocks, the round form is acted on in a drilling hole in the process of splitting, compared with the prior art, the round splitting form can act on force uniformly around, the splitting gun does not need to be installed and placed according to the requirement of splitting, meanwhile, force can be acted on all around, the pressure provided by a hydraulic system is utilized to the maximum degree, the splitting effect is better, the top of a wedge block can be set to move around, the splitting gun can be movably adjusted to adapt when deviation is generated due to external factors when splitting is carried out, and the adaptability of the splitting machine is improved.
2. Through setting up stone blocking block and magnet in the piece outside of cleaving, and stone blocking block and cambered surface groove remain the laminating condition throughout, compare in prior art, through stone blocking block when the piece is cleaved to the displacement all around with two pieces of cleaving between remain the laminating all the time, can not produce the clearance, avoid the stone to get into the inside condition that causes the jam of piece of cleaving, stone blocking block can also produce the rotation of certain angle, guaranteed that it can not obstruct the motion of other pieces of cleaving, magnet plays the effect of stone blocking block and cambered surface groove laminating at the splitting in-process, the design in this kind of cambered surface groove also can guarantee when closing the splitting rifle that the tip edge of stone blocking block is closed along the cambered surface to receive, also guaranteed that the stone can not adsorb on the cambered surface groove or the card advances in the middle of the piece of cleaving, increase the life of splitting rifle.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an overall assembled cross-sectional view of the present invention;
FIG. 3 is a transverse cross-sectional view of the inventive structure;
FIG. 4 is a schematic view of the wedge structure of the present invention;
FIG. 5 is a schematic view of the cleaving gun of the present invention;
FIG. 6 is a top view of the cleaving gun configuration of the present invention;
FIG. 7 is a cross-sectional view of the cleaving gun of the present invention;
FIG. 8 is a schematic view of the wedge structure of the present invention.
In the figure: 1. a hydraulic cylinder; 101. a cylinder body; 102. an oil inlet; 103. a limiting ring; 2. a splitting gun; 3. splitting the block; 301. a block body; 302. clamping a sliding head; 303. a stone block; 304. a magnet; 305. a cambered surface groove; 306. a magnet slot; 307. rotating the limiting groove; 4. a plunger push rod; 401. a movable groove; 5. a wedge block; 6. a conical spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, a machine-mounted hard stone splitter comprises a hydraulic cylinder 1 and a splitting gun 2, wherein the splitting gun 2 is movably mounted at the bottom of the hydraulic cylinder 1, the hydraulic cylinder 1 comprises a cylinder body 101, an oil inlet 102 is formed in the top of the cylinder body 101, hydraulic oil enters the cylinder body to provide power for the splitting gun, a limiting ring 103 is fixedly mounted at an inner ring of the cylinder body 101, on one hand, the limiting ring 103 ensures that a plunger push rod 4 cannot be pushed downwards to exceed the range of equipment, on the other hand, the wedge 5 is ensured to return to the original position when being lifted, the plunger push rod 4 is movably mounted at the top of the inner ring of the cylinder body 101, the splitting gun 2 is movably sleeved at the inner ring at the bottom of the cylinder body 101, the splitting gun 2 comprises four identical splitting blocks 3, the four blocks 3 are attached to form a cylinder, the cylinder is the splitting gun 2, the splitting, the inclined plane is in a trapezoid shape with a large upper part and a small lower part, so that the wedge blocks 3 and the wedge blocks 5 can be always in a joint state when the wedge block 5 is pushed and pressed downwards, hydraulic pressure is enabled to act on each wedge block 3 uniformly, stress is more uniform, the top of the block body 301 is fixedly provided with a clamping sliding head 302, the outer side of the clamping sliding head 302 is movably sleeved at the bottom of the inner ring of the cylinder body 101 through the sliding head, the outer side groove wall of the clamping sliding head 302 is fixedly connected with a conical spring 6, one side of the block body 301 is movably provided with a block 303, the middle part of the inner side of the block 303 is fixedly provided with a magnet 304, the other side of the block body 301 is provided with an arc surface groove 305 matched with the block 303 in shape and size, the outer surface of the arc surface groove 305 is provided with a magnet groove 306 matched with the magnet 304 in shape and size, and the block 303 and the arc surface groove 305 are the same in, and because magnet 304 adsorbs magnet groove 306 always when carrying out the splitting, can make the fender piece 303 laminate cambered surface groove 305 always and produce slight rotation separation, but there can not be the clearance and get into the stone, the life of splitting rifle 2 has been guaranteed, the rotation spacing groove 307 has been seted up with fender piece 303 junction to the inside of block 301, the one side of fender piece 303 stretches into in the rotation spacing groove 307, circular movable groove 401 has been seted up to the bottom of plunger push rod 4, voussoir 5 has been cup jointed in the activity of movable groove 401, the bottom of voussoir 5 is positive toper platform form, and the inclined plane of toper platform is the same with the inclined plane inclination of block 301.
Wherein, spacing ring 103 and activity groove 401 inner wall are the same to the distance of voussoir 5, can be because the different surfaces receive the reaction force of hard stone different when splitting rifle 2 carries out the work, in order to make each balanced splitting rifle 2 of face atress can carry out the adjustment of minimaling, this clearance distance that exists can provide the space of adjustment during the adjustment, but the same assurance of upper and lower adjustable distance makes whole splitting rifle 2 produce the slope, and the splitting effect is better.
The clamping sliding head 302 is in a C shape with an opening towards the outside, the conical spring 6 is connected between the C-shaped bottom wall of the clamping sliding head 302 and the inner wall of the cylinder body 101, the larger end of the conical spring 6 is connected to the inner wall of the cylinder body 101, on one hand, the clamping sliding head 302 connects the splitting block 3 and the cylinder body 101 together, on the other hand, when the splitting block is folded, the splitting block 3 is folded and reset to an initial state under the action of the conical spring 6, and the adjacent splitting blocks 3 are enabled to be tightly attached.
The arc-shaped groove 305 is made of a hard alloy material capable of being adsorbed by the magnet 304, so that the blocking block 303 is attached to the arc-shaped groove 305, and only relative sliding is generated, and a gap is not formed to enter the stone.
Wherein, the tip in the fender piece 303 outside is the arc, and the arc side can be closed along cambered surface groove 305 when closing, and the curved side slides on cambered surface groove 305 and pushes away the adsorbed stone on its surface this moment, and on the other hand can guarantee that the stone can not enter into between the adjacent piece 3 of splitting.
Wherein, there is an included angle of 5 degrees between the both sides face that keeps off the stone piece 303 and is located the inside one end of rotation spacing groove 307, and the small angle is because voussoir 5 bulldozes downwards when carrying out the splitting, splits piece 3 and opens to the outside, keeps off the stone piece 303 because the existence of rotation included angle just can not produce because the factor that the curved surface stretches and keeps off the expansion of adjacent splitting piece 3, has reduced and has opened the resistance, reduces the loss of power.
The working principle is that before use, the whole splitting gun 2 is placed into a hard stone hole drilled in advance, a hydraulic device is started, hydraulic oil is introduced into a hydraulic cylinder 1 by the hydraulic device, the hydraulic oil pushes a plunger push rod 4 to move downwards, the plunger push rod 4 drives a wedge block 5 to downwards abut against a splitting block 3, the splitting block 3 is outwards opened at the bottom of a cylinder body 101 through a clamping sliding head 302 under the action of the wedge block 5, the opening distance of the splitting block 3 towards the periphery is larger and larger along with the deeper and deeper downward abutting of the wedge block 5, a blocking stone block 303 slides along an arc surface groove 305 in the opening process of the splitting block 3 and slightly rotates, the magnet 304 is tightly attracted with the magnet groove 306 to ensure that no gap exists between the blocking stone block 303 and the arc surface groove 305, the stone cannot enter the splitting gun 2, when the splitting block 3 is opened sufficiently, the stone can be split into a crack, and the splitting process is completed, receive splitting rifle 2 through reducing hydraulic pressure receipts, this moment keep laminating all the time along cambered surface groove 305 again to the initial position by the fender piece 303, this in-process also keeps the laminating under magnet 304's effect, the cambered surface of fender piece 303 one side can prevent that the surface clean up of cambered surface groove 305 from having the small stone to adsorb on it when receiving, conical spring 6 plays the effect that supplementary piece 3 of splitting was received fast to receive, improve work efficiency, treat that 3 whole laminatings of piece 3 have accomplished promptly when inseparable and receive the process of receiving, whole splitting is accomplished this moment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a machine-mounted formula splitting machine of hard stone, includes pneumatic cylinder (1) and splitting rifle (2), the bottom and splitting rifle (2) movable mounting of pneumatic cylinder (1), its characterized in that: the hydraulic cylinder (1) comprises a cylinder body (101), an oil inlet (102) is formed in the top of the cylinder body (101), a limiting ring (103) is fixedly mounted on the inner ring of the cylinder body (101), a plunger push rod (4) is movably mounted at the top of the limiting ring (103) on the inner ring of the cylinder body (101), a splitting gun (2) is movably sleeved on the inner ring at the bottom of the cylinder body (101), the splitting gun (2) comprises four identical splitting blocks (3), the four splitting blocks (3) are attached to form a cylinder, each splitting block (3) comprises a block body (301), the inner side surface of each block body (301) is an inclined plane, the inclined plane is in a ladder shape with a large upper part and a small lower part, a clamping sliding head (302) is fixedly mounted at the top of each block body (301), the outer side of each clamping sliding head (302) is sleeved at the bottom of the inner ring of the cylinder body (101) through the sliding head movement, and a, one side of the block body (301) is movably provided with a block retaining block (303), the middle part of the inner side of the block retaining block (303) is fixedly provided with a magnet (304), the other side of the block body (301) is provided with an arc surface groove (305) which is matched with the block (303) in shape and size, the outer surface of the cambered surface groove (305) is provided with a magnet groove (306) which is matched with the shape and size of the magnet (304), a rotary limiting groove (307) is arranged at the joint of the inner part of the block body (301) and the stone blocking block (303), one side of the stone blocking block (303) extends into the rotation limiting groove (307), the bottom of the plunger push rod (4) is provided with a circular movable groove (401), the wedge block (5) is movably sleeved in the movable groove (401), the bottom of the wedge block (5) is in a shape of a right conical table, and the inclined plane of the conical table is the same as the inclined plane of the block body (301).
2. A hard stone machine-mounted splitter as claimed in claim 1, wherein: the distance between the limiting ring (103) and the inner wall of the movable groove (401) to the wedge block (5) is the same.
3. A hard stone machine-mounted splitter as claimed in claim 1, wherein: joint slippery fellow (302) is the C font to outside open-ended, conical spring (6) are connected between the C font diapire of joint slippery fellow (302) and the inner wall of cylinder body (101), and the great one end of conical spring (6) is connected on the inner wall of cylinder body (101).
4. A hard stone machine-mounted splitter as claimed in claim 1, wherein: the cambered surface groove (305) is made of hard alloy materials capable of being adsorbed by the magnet (304).
5. A hard stone machine-mounted splitter as claimed in claim 1, wherein: the end part of the outer side of the stone blocking block (303) is arc-shaped.
6. A hard stone machine-mounted splitter as claimed in claim 1, wherein: and an included angle of 5 degrees is formed between two side surfaces of one end, positioned in the rotation limiting groove (307), of the stone blocking block (303).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010101888.3A CN111119888B (en) | 2020-02-19 | 2020-02-19 | Machine-mounted splitting machine for hard stones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010101888.3A CN111119888B (en) | 2020-02-19 | 2020-02-19 | Machine-mounted splitting machine for hard stones |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111119888A CN111119888A (en) | 2020-05-08 |
| CN111119888B true CN111119888B (en) | 2020-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010101888.3A Active CN111119888B (en) | 2020-02-19 | 2020-02-19 | Machine-mounted splitting machine for hard stones |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111119888B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114425479B (en) * | 2022-01-26 | 2023-05-05 | 武宣益德矿业有限责任公司 | Crushing device for ore exploitation based on impact |
| CN114542064B (en) * | 2022-03-04 | 2023-03-28 | 徐州奔蓝机械科技有限公司 | Splitting machine for mine excavation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU783469A1 (en) * | 1972-04-07 | 1980-11-30 | Казахский политехнический институт им. В.И.Ленина | Hydraulic wedge |
| SU1126332A1 (en) * | 1982-10-05 | 1984-11-30 | Конструкторско-Технологическое Бюро "Авторемонт" | Device for pressure spraying of liquid |
| CN2302107Y (en) * | 1997-09-11 | 1998-12-30 | 上海高溪机电实业有限公司 | Machine for cleaving rock |
| CN203451232U (en) * | 2013-08-15 | 2014-02-26 | 汕头保税区三宝光晶云母科技有限公司 | Blowing-in device of production line for artificially synthesizing fluorophlogopite sheets |
| CN106003428A (en) * | 2016-07-12 | 2016-10-12 | 青岛科技大学 | Hydraulic rock splitter |
| CN206085358U (en) * | 2016-07-12 | 2017-04-12 | 青岛科技大学 | Rock hydraulic pressure splitting machine |
-
2020
- 2020-02-19 CN CN202010101888.3A patent/CN111119888B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU783469A1 (en) * | 1972-04-07 | 1980-11-30 | Казахский политехнический институт им. В.И.Ленина | Hydraulic wedge |
| SU1126332A1 (en) * | 1982-10-05 | 1984-11-30 | Конструкторско-Технологическое Бюро "Авторемонт" | Device for pressure spraying of liquid |
| CN2302107Y (en) * | 1997-09-11 | 1998-12-30 | 上海高溪机电实业有限公司 | Machine for cleaving rock |
| CN203451232U (en) * | 2013-08-15 | 2014-02-26 | 汕头保税区三宝光晶云母科技有限公司 | Blowing-in device of production line for artificially synthesizing fluorophlogopite sheets |
| CN106003428A (en) * | 2016-07-12 | 2016-10-12 | 青岛科技大学 | Hydraulic rock splitter |
| CN206085358U (en) * | 2016-07-12 | 2017-04-12 | 青岛科技大学 | Rock hydraulic pressure splitting machine |
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| Publication number | Publication date |
|---|---|
| CN111119888A (en) | 2020-05-08 |
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Effective date of registration: 20231023 Address after: 221000 meters east of the Star Sign on Sanhuan North Road, Xuzhou City, Jiangsu Province Patentee after: Xuzhou Tiangu Technology Co.,Ltd. Address before: 221005 Pipa Street Center Complex Building 7-018, North Side of Hongxing Avenue, Gulou District, Xuzhou City, Jiangsu Province Patentee before: Xuzhou muzelin Construction Engineering Co.,Ltd. |
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