CN105936119B - A kind of short screw extruder - Google Patents
A kind of short screw extruder Download PDFInfo
- Publication number
- CN105936119B CN105936119B CN201610543257.0A CN201610543257A CN105936119B CN 105936119 B CN105936119 B CN 105936119B CN 201610543257 A CN201610543257 A CN 201610543257A CN 105936119 B CN105936119 B CN 105936119B
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- China
- Prior art keywords
- support portion
- spiral shell
- shell rib
- screw
- gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 239000011148 porous material Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 229920005992 thermoplastic resin Polymers 0.000 description 5
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 125000003003 spiro group Chemical group 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011236 particulate material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/84—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders by heating or cooling the feeding screws
- B29C48/845—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/82—Cooling
Abstract
A kind of short screw extruder, including machine barrel (1), screw rod (2) and injection shaft (3), screw rod (2) includes the screw body for having central through hole, the screw body has left support portion (2.3) and right support portion (2.4), screw body is equipped with outer spiral shell rib (2.1) between left support portion and right support portion, interior spiral shell rib (2.2) is equipped with from hole site in the correspondence of right support end (2.4) in the centre bore of screw body, one section of rotatable engagement is in machine barrel (1) between the left support portion (2.3) and right support portion (2.4) of the screw body, injection shaft (3) cooperation is in the interior spiral shell rib (2.2)；The outer spiral shell rib (2.1) and interior spiral shell rib (2.2) hand of spiral are reversed.The short screw extruder has accomplished that external spiral channel is folded relative to inside spin channel, has shortened the length of screw rod, realized the miniaturization of extruder.
Description
Technical field
The present invention relates to the technical fields of extruder, and in particular to a kind of short screw extruder.
Background technology
Screw extruder is the important equipment of plastic cement processing, and screw rod is its core component, and the length of screw rod determines to squeeze out
The length of machine.In extruder, machine barrel/screw rod has three big effects：When feeding conveying effect, i.e. feeding section, second is that plastication,
Particulate material is melted into plastic cement melt, i.e. fluxing zone；Third, the extruding zone of steady extruding, will there is melt-stoichiometry effect.
The screw extruder of the prior art must make screw rod long enough to obtaining the good injecting products of quality so that
Obtaining it has enough mixing length fully to melt thermoplastic resin material, and therefore, extruder increasingly has the tendency that enlargement.
And the product delivery cycle increasingly shortens in recent years, it is desirable that the plasticizing rate of screw rod will be getting faster, and many extruders changes are capable not
From the heart.
Stock is few in the injecting cavity of screw-type extruder, in the occasion for needing mass storage liquid plastics, needs to accelerate wink
Shi Jiare improves liquid storage amount to reach shot or increase injecting cavity；The former, which accelerates instantaneously to heat, needs temperature high energy
Amount consumption is big；Injection pressure after the latter's increasing injecting cavity is small, and injection force is insufficient.Need to design that a kind of spiro rod length is short, metering
Chamber long extruder meets injection molding needs.
Invention content
Defect present in for the above-mentioned prior art, the purpose of the present invention is to provide a kind of short screw extruders.
The object of the present invention is achieved like this, a kind of short screw extruder, including machine barrel, screw rod and injection shaft, screw rod
Include the screw body with central through hole, the screw body has left support portion and a right support portion, screw body in left support portion and
Outer spiral shell rib is equipped between right support portion, equipped with interior spiral shell from hole site in the correspondence at right support end in the centre bore of screw body
Rib, one section of rotatable engagement is in machine barrel between the left support portion and right support portion of the screw body, and the injection shaft cooperation is in institute
It states in interior spiral shell rib；
The outer spiral shell rib and the interior spiral shell rib hand of spiral are reversed；
External spiral channel between the outer spiral shell rib and machine barrel is external screw thread transportation section, between the interior spiral shell rib and injection shaft
Inside spin channel until the head spiral shell rib generally corresponded to injection shaft head be inside spin fluxing zone since the right support portion,
Head spiral shell rib is inside spin extruding zone；
The end end of the external spiral transportation section is equipped at least three intercommunicating pore, and the intercommunicating pore one end open is in external spiral
In transportation section, the other end is opened in inside spin fluxing zone.
Further, screw pitch identical spiral shell rib of the outer spiral shell rib from left support portion to right support portion continuously decreases, screw body
From left support portion to right support portion with 5 °~25 ° of circular cone oblique angle.
Further, screw body corresponds to inside spin fluxing zone and inside spin extruding zone is equipped with heating device, the heating dress
Setting in the position of close central through hole wall in screw body.
Further, the left support portion is rotatably supported on left shaft holder, and right support portion is rotatably supported on right axle bearing
On.
Further, the pressing plate of gear-box is fixedly connected with the flange of machine barrel, and the left shaft holder is fitted in by flange
In the bearing press mounting hole of gear-box.
Further, the screw body only includes left support portion, and screw body is rotatably supported in left support portion；Screw body
Right end is free end, and free end extend into the spacing distance apart from right shell body in machine barrel, which is configured to replace connection
The communicating passage in hole.
Further, it is combined with rolling bearing between the endoporus corresponding position in injection shaft and right support portion.
Further, axis connection driving device is injected.
Further, the rotating driving device that the left support portion side of the screw rod is arranged in gear-box, it is described
Rotating driving device includes driven gear, driving gear and drive shaft, is installed with driven gear in screw body, it is described from
Moving gear is engaged with driving gear, and driving gear is installed on the driving shaft.
Further, the drive shaft is rotatably provided in gear-box, and the drive shaft is driven by motor.
The short screw extruder has accomplished that spiro rod length is less than fluid channel by the following special construction design of screw rod
Length：
1) sleeve of spiral shell rib inside and outside, screw body have outer spiral shell rib and interior spiral shell rib simultaneously, and outer spiral shell rib is used to coordinate with machine barrel, interior
Spiral shell rib is used to coordinate with injection shaft；
2) internal and external screw channel, the cooperation of sleeve and machine barrel and axis, outer spiral shell rib cooperatively form external spiral channel with machine barrel, outside
Helical duct is responsible for conveying particulate material and gives inside spin channel；Interior spiral shell rib cooperatively forms inside spin channel with injection shaft；
3) intercommunicating pore or communicating passage, intercommunicating pore or communicating passage are connected between external spiral channel and inside spin channel,
External spiral channel is connected to by communicating passage with inside spin channel constitutes whole screw rod fluid channel so that external spiral channel is opposite
It is folded in inside spin channel, non-rectilinear is ranked sequentially.
By the mutual cooperation of three above structure, accomplish that external spiral channel is folded relative to inside spin channel jointly,
The length for having shortened screw rod realizes the miniaturization of extruder；Thermoplastic resin is by intercommunicating pore or the dynamic of communicating passage
Shear stress makes resin by Flashmelt, convenient for forming the hot-melt resin of homogeneous high pressure in extruding zone；Screw design at
The sleeve of inside and outside spiral shell rib, as long as the sleeve that the maintenance in terms of spiral shell rib abrasion more renews, repair and replacement are at low cost.
Description of the drawings
Fig. 1 is the main sectional view of short screw extruder of the present invention.
Reference numeral in above-mentioned figure：
1 machine barrel, 2 screw rods, 3 injection shafts, 4 driving devices, 5 hoppers, 6 intercommunicating pores, 7 storing areas, 8 rolling bearings, 9 left bearings
Seat, 10 right axle bearings, 11 gear-boxes, 12 driven gears, 13 driving gears, 14 drive shafts, 15 heating devices, 16 bearing press mountings
Hole, 17 pressing plates, 18 flanges, 19 right shell bodies, 20 die heads
2.1 outer spiral shell ribs, spiral shell rib in 2.2,2.3 left support portions, 2.4 right support portions
Specific implementation mode
It elaborates to the embodiment of the present invention below in conjunction with attached drawing, but is not limited to the scope of the present invention.
Embodiment 1
As shown, a kind of short screw extruder, including machine barrel 1, screw rod 2, injection shaft 3, injection shaft 3 connect driving device
4, screw rod 2 is rotatably provided in machine barrel 1, and screw rod 2 includes the screw body for having central through hole, and the screw body has left support portion
2.3 and right support portion 2.4, the outside cylinder of screw rod 2 is equipped with outer spiral shell rib 2.1 between left support portion 2.3 and right support portion 2.4,
Coordinate in the interior spiral shell equipped with interior spiral shell rib 2.2, the injection shaft 3 from hole site in the correspondence in right support portion 2.4 in centre bore
In rib 2.2；It is combined with rolling bearing 8 between the endoporus corresponding position in injection shaft 3 and right support portion 2.4, to reduce injection shaft
The frictional force of forward or backward；
As shown, the outer spiral shell rib 2.1 and interior 2.2 hand of spiral of spiral shell rib are reversed, outer spiral shell rib 2.1 is fight hand flight
When, interior spiral shell rib 2.2 is left-handed spiral shell rib, just can guarantee that the conveying direction of outer spiral shell rib 2.1 is when screw rod 2 rotates counterclockwise in this way
The conveying to the right of material 2.4 spiral of support portion movement to the right, the conveying direction of interior spiral shell rib 2.2 is material 2.3 spiral shell of support portion to the left
Revolve mobile conveying to the left.
The left support portion 2.3 of the screw rod 2 is rotatably supported on left shaft holder 9, and right support portion 2.4 is rotatably supported on right axle
In bearing 10, the pressing plate 17 of gear-box 11 is fixedly connected with the flange 18 of machine barrel 1, and the left shaft holder 9 is pressed by flange 18
In the bearing press mounting hole 16 of gear-box 11, the gear-box 11 and the right axle bearing 10 are installed in rack；Right axle supports
Seat 10 is fixed in right shell body 19.
Screw pitch identical spiral shell rib of the outer spiral shell rib 2.1 from left support portion 2.3 to right support portion 2.4 continuously decreases, screw body
From left support portion 2.3 to right support portion 2.4 with 5 °~25 ° of circular cone oblique angle.The outer spiral shell rib 2.1 of the screw rod 2 and machine barrel 1 it
Between external spiral channel be external screw thread transportation section A, inside spin channel between the interior spiral shell rib 2.2 and injection shaft 3 is from right support
Portion 2.4 starts until the head spiral shell rib generally corresponded to 3 head of injection shaft to be inside spin fluxing zone B, and head spiral shell rib is interior spiral shell
Revolve extruding zone C.
The driving device 4 is motor or oil cylinder.
2.3 side of left support portion of the screw rod 2 is equipped with rotating driving device, and the rotating driving device includes driven tooth
Wheel 12, driving gear 13 and drive shaft 14 are installed with driven gear 12, the driven gear 12 and active in screw body
Gear 13 engages, and driving gear 13 is mounted in drive shaft 14, and the drive shaft 14 is rotatably provided in gear-box 11, the drive
Moving axis 14 is driven by motor.
The initiating terminal of the external spiral transportation section A of the screw rod 2 is equipped with hopper 5, and the end end of the external spiral transportation section A is set
There is at least three intercommunicating pore 6, for 6 one end open of the intercommunicating pore in the A of external spiral transportation section, the other end is opened on inside spin plasticizing
In section B；Graininess thermoplastic resin material is added from hopper 5, and by the effect of outer spiral shell rib 2.1,2.4 direction of support portion will to the right
Material is gradually squeezed and is fed forward, until the material of external spiral transportation section A is imported inside spin fluxing zone B, material from intercommunicating pore 6
Spiral melting forward is transported to inside spin extruding zone C, is stored in storing area 7, and the molten thermoplastic resin of storing area 7 pushes note
Penetrate the retrogressing of axis 3.The endoporus in the right support portion 2.4 of the screw rod 2 is coordinated by rolling bearing 8 and the sealing of injection shaft 3.
The spiral shell rib of the screw rod is actually the helical duct and inside spin melt zone and inside spin external spiral transportation section
What the helical duct of extruding zone obtained after being folded, therefore its spiro rod length is relatively short, extruder relatively small.
Screw body corresponds to inside spin fluxing zone B and inside spin extruding zone C and is equipped with heating device 15, the heating device 15
Close to the position of central through hole wall in screw body.It is further preferred that 15 outside of heating device in outer helical feed section A is set
There is heat insulation layer 21.
The left end of the screw rod connects die head 20.
Embodiment 2
The screw body of the screw rod 2 only includes left support portion 2.3, and the left shaft holder 9 in the left support portion 2.3 is interval one
Two bearing blocks of set a distance or a bearing block with rotation bearing length enough, the screw body of screw rod 2 are rotatably supported on
In left support portion 2.3；The right end of screw body is free end, extend into machine barrel 1 the spacing distance H apart from right shell body 19.Between being somebody's turn to do
Gauge is configured to the communicating passage instead of intercommunicating pore 6 from H.Screw body is equipped between left support portion 2.3 and the right end of screw body
Outer spiral shell rib 2.1.
Graininess thermoplastic resin material is added from hopper 5, will from the effect of outer spiral shell rib 2.1 to screw body right end direction
Material is gradually squeezed and is fed forward, until the material of external spiral transportation section A is imported interior spiral shell from screw body right end through communicating passage
Fluxing zone B is revolved, spiral melting is transported to inside spin extruding zone C to material forward, is stored in storing area 7, the melting heat of storing area 7
Plastic resin pushes injection shaft 3 to retreat.
Claims (8)
1. a kind of short screw extruder, including machine barrel (1), screw rod (2) and injection shaft (3), which is characterized in that
Screw rod (2) includes the screw body for having central through hole, and the screw body has left support portion (2.3) and right support portion
(2.4), screw body is equipped with outer spiral shell rib (2.1) between left support portion and right support portion, from right branch in the centre bore of screw body
Hole site in the correspondence of end (2.4) is supportted to rise equipped with interior spiral shell rib (2.2), the left support portion (2.3) of the screw body and right support portion
(2.4) one section of rotatable engagement is in machine barrel (1) between, and injection shaft (3) cooperation is in the interior spiral shell rib (2.2)；
The left support portion (2.3) is rotatably supported on left shaft holder (9), and right support portion (2.4) are rotatably supported on right axle bearing
(10) on；The left shaft holder (9) is fitted in gear-box (11), and the gear-box (11) and the right axle bearing (10) are equal
In rack；The outer spiral shell rib (2.1) and interior spiral shell rib (2.2) hand of spiral are reversed；
External spiral channel between the outer spiral shell rib (2.1) and machine barrel (1) is external spiral transportation section (A), the interior spiral shell rib (2.2)
Inside spin channel between injection shaft (3) is since right support portion (2.4) to the head generally corresponded to injection shaft (3) head
It is inside spin fluxing zone (B) until spiral shell rib, head spiral shell rib is inside spin extruding zone (C)；
The end end of the external spiral transportation section (A) is equipped at least three intercommunicating pore (6), and intercommunicating pore (6) one end open is in outer
In helical feed section (A), the other end is opened in inside spin fluxing zone (B).
2. short screw extruder as described in claim 1, which is characterized in that the outer spiral shell rib (2.1) from left support portion (2.3) extremely
The identical spiral shell rib of screw pitch in right support portion (2.4) continuously decreases, and screw body has from left support portion (2.3) to right support portion (2.4)
5 °~25 ° of circular cone oblique angle.
3. short screw extruder as described in claim 1, which is characterized in that screw body corresponds to inside spin fluxing zone (B) and interior spiral shell
It revolves extruding zone (C) and is equipped with heating device (15), the heating device (15) is located in screw body close to the position of central through hole wall.
4. short screw extruder as claimed in claim 3, which is characterized in that gear-box (11) includes pressing plate (17), bearing pressure
It fills hole (16), machine barrel (1) left end is equipped with flange (18), the pressing plate (17) left bearing when being fixedly connected with flange (18)
Seat (9) is fitted in by flange (18) in bearing press mounting hole (16).
5. short screw extruder as described in claim 1, which is characterized in that in the endoporus of injection shaft (3) and right support portion (2.4)
Rolling bearing (8) is combined between corresponding position.
6. short screw extruder as described in claim 1, which is characterized in that injection shaft (3) connects driving device (4).
7. the short screw extruder as described in claim 2-6 is any, which is characterized in that the left support portion (2.3) of the screw rod (2)
Side is equipped with the rotating driving device being arranged in gear-box (11), and the rotating driving device includes driven gear (12), master
Moving gear (13) and drive shaft (14) are installed with driven gear (12), the driven gear (12) and master in screw body
Moving gear (13) engages, and driving gear (13) is mounted in drive shaft (14).
8. short screw extruder as claimed in claim 7, which is characterized in that the drive shaft (14) is rotatably provided in gear-box
(11) in, the drive shaft (14) is driven by motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610543257.0A CN105936119B (en) | 2016-07-11 | 2016-07-11 | A kind of short screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610543257.0A CN105936119B (en) | 2016-07-11 | 2016-07-11 | A kind of short screw extruder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105936119A CN105936119A (en) | 2016-09-14 |
| CN105936119B true CN105936119B (en) | 2018-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610543257.0A Active CN105936119B (en) | 2016-07-11 | 2016-07-11 | A kind of short screw extruder |
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| Country | Link |
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| CN (1) | CN105936119B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017114841B4 (en) | 2017-07-04 | 2022-09-15 | Aim3D Gmbh | Device and method for the extrusion of thermo-mechanically deformable granular materials |
| DE102018102731B4 (en) | 2018-02-07 | 2023-03-02 | Aim3D Gmbh | Device and method for the additive manufacturing of a workpiece or component made of reinforced plastics |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204749210U (en) * | 2015-05-27 | 2015-11-11 | 顺德职业技术学院 | Take hollow screw's extruder |
| CN205800143U (en) * | 2016-07-11 | 2016-12-14 | 盐城工学院 | A kind of short screw extruder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2257410A1 (en) * | 1973-09-11 | 1975-08-08 | Creusot Loire | Homogenising head for matl. flowing through cranked channel - has revolving screw causing thorough remixing and driven by flow |
| CN102896759B (en) * | 2012-10-18 | 2015-03-11 | 华南理工大学 | Rotation and axial vibration synergic driving method and device for screw rod of directly-driven dynamic extruder |
-
2016
- 2016-07-11 CN CN201610543257.0A patent/CN105936119B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204749210U (en) * | 2015-05-27 | 2015-11-11 | 顺德职业技术学院 | Take hollow screw's extruder |
| CN205800143U (en) * | 2016-07-11 | 2016-12-14 | 盐城工学院 | A kind of short screw extruder |
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| Publication number | Publication date |
|---|---|
| CN105936119A (en) | 2016-09-14 |
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Denomination of invention: A Short Screw Extruder Effective date of registration: 20230330 Granted publication date: 20180817 Pledgee: Shandong Linyi Luozhuang Rural Commercial Bank Co.,Ltd. Pledgor: Linyi Tianzeyuan Ecological Wood Co.,Ltd. Registration number: Y2023980036700 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A short screw extruder Granted publication date: 20180817 Pledgee: Shandong Linyi Luozhuang Rural Commercial Bank Co.,Ltd. Pledgor: Linyi Tianzeyuan Ecological Wood Co.,Ltd. Registration number: Y2024980010847 |