CN114228072A - High-pressure and low-pressure separated composite injection device and composite injection method - Google Patents
High-pressure and low-pressure separated composite injection device and composite injection method Download PDFInfo
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- CN114228072A CN114228072A CN202111375531.5A CN202111375531A CN114228072A CN 114228072 A CN114228072 A CN 114228072A CN 202111375531 A CN202111375531 A CN 202111375531A CN 114228072 A CN114228072 A CN 114228072A
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- 238000002347 injection Methods 0.000 title claims abstract description 220
- 239000007924 injection Substances 0.000 title claims abstract description 220
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000001746 injection moulding Methods 0.000 abstract description 9
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
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Classifications
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a high-pressure and low-pressure separated composite injection device and a composite injection method, which enable injection molding equipment to meet high-pressure maintaining and realize quick injection, and are small in size and low in cost. The feeding hole is communicated with the runner hole; the material storage hole is in a step hole shape, and the aperture of the front section is smaller than that of the rear section; the low-pressure injection plunger is slidably arranged in the rear section of the material storage hole, and the tail end of the low-pressure injection plunger is arranged on the injection push plate; a guide sealing hole is formed in the low-pressure injection plunger, the guide sealing hole is in a step hole shape, and the aperture of the front section is larger than that of the rear section; the front section of the high-pressure injection plunger is a piston body, the rear section of the high-pressure injection plunger is a plunger rod body, the axial diameter of the piston body is larger than that of the plunger rod body, the piston body is slidably arranged in the front section of the guide sealing hole and the front section of the material storage hole, the plunger rod body is slidably arranged in the rear section of the guide sealing hole, and the tail end of the plunger rod body is connected with a piston rod of a high-pressure injection oil cylinder; the low-pressure injection oil cylinder is fixedly arranged on the injection seat, and a piston rod of the low-pressure injection oil cylinder is connected with the injection push plate; the high-pressure injection oil cylinder is fixed on the injection push plate.
Description
Technical Field
The invention relates to a high-pressure and low-pressure separated composite injection device and a composite injection method, which are used in a plastic product injection molding machine.
Background
In injection molding production, defects are generated due to shrinkage during cooling after injection molding of plastic articles. For quality assurance, dwell feeding is required during cooling for some articles. However, when the product is cooled, the plastic will gradually solidify, which causes a rapid deterioration in the flowability, and therefore a higher holding pressure is required for feeding.
In conventional injection molding equipment, the injection mechanism often comprises an injection cylinder, an injection seat, an injection screw (or plunger), a material storage barrel, a front material barrel, a nozzle, etc., as shown in chinese patent application No. 201420614046.8. The injection and pressure holding actions are usually performed by an injection cylinder, and the injection and pressure holding actions are usually performed by the same screw or the same plunger. According to pascal's law: p(pressure maintaining)= system pressure P(System)X injection oil cylinder A(oil cylinder)/ A(screw)In the formula: p(pressure maintaining)For maintaining the pressure, P(System)Is the system pressure, A(oil cylinder)Is the sectional area of the injection cylinder, A(screw)Is the injection screw (or injection plunger) cross-sectional area. The screw or plunger being associated with the injection volume and having a cross-sectional area A(screw)Is usually deterministic, so P(pressure maintaining)∝P(System) ×A(oil cylinder)。
The cylinders for injection and pressure maintaining are injection cylinders, and the sectional area of the cylinder is changed to obtain higher P(pressure maintaining)The injection seat, the hydraulic system and the like need to be comprehensively changed, the overall modification engineering quantity is large, the period is long, the overall appearance size is increased, and the modification cost is very high.
To promote P(System)To obtain higher P(pressure maintaining)And the purchasing cost can be greatly improved due to the limitation of matching components such as a motor and an oil pump.
In summary, in the existing injection molding equipment, increasing the pressure maintaining pressure is usually a method of increasing an injection cylinder or a system, which will greatly increase the overall dimension of the whole machine, and is limited by components, and meanwhile, the manufacturing cost is greatly increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the high-pressure and low-pressure separated composite injection device and the composite injection method with reasonable structural design, so that the injection molding equipment meets high-pressure maintaining, realizes quick injection, and has small size and low cost.
The technical scheme adopted by the invention for solving the problems is as follows: a high-low pressure separated composite injection device comprises a nozzle, a front charging barrel, a charging barrel, an injection plunger, an injection oil cylinder, an injection seat and an injection push plate; the nozzle is fixed with the front charging barrel, the front charging barrel is fixed with the material storage barrel, and the material storage barrel is fixed on the injection seat; a material storage hole is formed in the material storage barrel; a runner hole is arranged in the front charging barrel, one end of the runner hole is communicated with the nozzle, and the other end of the runner hole is communicated with the material storage hole; the front charging barrel is also provided with a feeding hole which is communicated with the runner hole; the method is characterized in that: the injection plunger comprises a low-pressure injection plunger and a high-pressure injection plunger, and the injection oil cylinder comprises a high-pressure injection oil cylinder and a low-pressure injection oil cylinder; the material storage hole is in a step hole shape and is divided into a front section and a rear section, and the aperture of the front section is smaller than that of the rear section; the low-pressure injection plunger is slidably arranged in the rear section of the material storage hole, and the tail end of the low-pressure injection plunger is arranged on the injection push plate; a guide sealing hole is formed in the low-pressure injection plunger, the guide sealing hole is in a step hole shape and is divided into a front section and a rear section, and the aperture of the front section of the guide sealing hole is larger than that of the rear section; the front section of the high-pressure injection plunger is a piston body, the rear section of the high-pressure injection plunger is a plunger rod body, the axial diameter of the piston body is larger than that of the plunger rod body, the piston body is slidably arranged in the front section of the guide sealing hole and the front section of the material storage hole, the plunger rod body is slidably arranged in the rear section of the guide sealing hole, and the tail end of the plunger rod body is connected with a piston rod of the high-pressure injection oil cylinder; the low-pressure injection oil cylinder is fixedly arranged on the injection seat, and a piston rod of the low-pressure injection oil cylinder is connected with the injection push plate; the high-pressure injection oil cylinder is fixed on the injection push plate.
The invention also comprises a fastening nut, and the material storage barrel is fixed on the injection seat by the fastening nut.
The front section of the low-pressure injection plunger is a piston body, the rear section of the low-pressure injection plunger is a plunger rod body, the piston body is slidably arranged in the rear section of the material storage hole, and the tail end of the plunger rod body is arranged on the injection push plate.
The outer diameter of the front section of the low-pressure injection plunger is larger than that of the rear section.
The flow passage hole is conical.
The head of the piston body is conical, and the taper is consistent with that of the runner hole.
The two low-pressure injection oil cylinders are symmetrically and fixedly arranged on two sides of the injection seat.
A high-pressure and low-pressure separated composite injection method is characterized in that: the compound injection device comprises the following steps:
(1) and a feeding stage:
closing the nozzle, opening a feed hole of the front charging barrel, injecting molten plastic from the feed hole, then flowing into the front section of the storage hole through the runner hole, pushing the high-pressure injection plunger and the piston rod in the high-pressure injection oil cylinder to retreat, and after the tail end of the piston body of the high-pressure injection plunger is contacted with the step of the guide sealing hole, simultaneously pushing the piston and the piston rod in the high-pressure injection plunger, the low-pressure injection plunger, the injection push plate, the high-pressure injection oil cylinder and the low-pressure injection oil cylinder to move backwards until the molten plastic enters the storage hole as required, so as to complete plasticization;
(2) and a low-pressure injection stage:
the nozzle is opened, the feeding hole of the front charging barrel is closed, the low-pressure injection oil cylinder works, the injection push plate is pulled, and the low-pressure injection plunger, the high-pressure injection oil cylinder and the high-pressure injection plunger are pulled forwards through the injection push plate, so that the molten plastic in the material storage hole is pushed to be sprayed out of the nozzle, the low-pressure injection is realized, and the low-pressure injection is stopped until the low-pressure injection plunger is contacted with the step of the material storage hole;
(3) and a high-pressure injection stage:
and when the head of the high-pressure injection plunger is contacted with the runner hole of the front charging barrel, the high-pressure injection is finished.
Compared with the prior art, the invention has the following advantages and effects: the invention enables the injection molding machine to realize injection rapidly, meets the requirement of high pressure maintaining, meets the requirement of product injection molding with low flow requirement, reduces the manufacturing cost, improves the pressure maintaining pressure, improves the injection precision, reduces the working energy consumption, and has the advantages of small size and low cost.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
FIG. 2 is a schematic side view of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a front view configuration of an embodiment of the present invention.
Fig. 4 is a schematic sectional view along a-a in fig. 3.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
The injection device comprises a nozzle 1, a front charging barrel 2, a charging barrel 4, a nut 3, a low-pressure injection plunger 5, a high-pressure injection plunger 6, a fastening nut 7, an injection seat 8, an injection push plate 9, a high-pressure injection oil cylinder 10 and a low-pressure injection oil cylinder 11.
The nozzle 1 and the front charging barrel 2 are fixed by screws, the front charging barrel 2 and the charging barrel 4 are fixed by screws, and the charging barrel 4 is fixed on the injection seat 8 by a fastening nut 7.
The material storage barrel 4 is internally provided with a material storage hole which is in a step hole shape and is divided into a front section and a rear section, and the aperture of the front section 41 is smaller than that of the rear section 42.
The outer part of the low-pressure injection plunger 5 is step-shaped, the outer diameter of the front section of the low-pressure injection plunger is larger than that of the rear section of the low-pressure injection plunger, the front section of the low-pressure injection plunger 5 is a piston body 53, and the rear section of the low-pressure injection plunger is a plunger rod body 54; the piston body 53 of the low-pressure injection plunger 5 is slidably arranged in the rear section 42 of the material storage hole and can flexibly and linearly slide; the rear end of the plunger rod body 54 of the low pressure injection plunger 5 is fitted with the injection push plate 9 while being mounted on the injection push plate 9 with a screw.
The low-pressure injection plunger 5 is internally provided with a guide sealing hole. The guide sealing hole is in a step hole shape and is divided into a front section and a rear section, and the aperture of the front section 51 of the guide sealing hole is larger than that of the rear section 52.
The exterior of the high-pressure injection plunger 6 is step-shaped, the external diameter of the front section of the high-pressure injection plunger is larger than that of the rear section of the high-pressure injection plunger 6, the front section of the high-pressure injection plunger 6 is a piston body 62, and the rear section of the high-pressure injection plunger is a plunger rod body 63. The head 61 of the piston body 62 is tapered in conformity with the taper of the passage hole 22 of the front barrel 2. The axial diameter of the piston body 62 is larger than that of the plunger rod body 63, and the piston body 62 is slidably mounted in the front section 51 of the guide sealing hole and the front section 41 of the material storage hole and can flexibly and linearly slide; the plunger rod body 63 is slidably arranged in the rear section 52 of the guide sealing hole, and the tail end of the plunger rod body 63 penetrates through the central hole of the injection push plate 9 and then is connected with the piston rod of the high-pressure injection oil cylinder 10.
Two low-pressure injection oil cylinders 11 are arranged and are fixedly arranged at two sides of the injection seat 8 by central symmetry of screws, and piston rods of the low-pressure injection oil cylinders 11 are connected with the injection push plate 9 by nuts 3.
The high-pressure injection oil cylinder 10 is fixed at the center of the injection push plate 9 by a screw.
The front barrel 2 is provided with a flow passage hole 22 inside, the flow passage hole 22 is conical, and one end is communicated with the nozzle 1, and the other end is communicated with the front section 41 of the storage hole of the storage barrel 4.
The front charging barrel 2 is provided with a feeding hole 21, and the feeding hole 21 is communicated with a runner hole 22.
A high-pressure and low-pressure separated composite injection method is carried out by adopting the high-pressure and low-pressure separated composite injection device, and comprises the following steps:
(1) and a feeding stage:
the nozzle 1 is closed, the feed hole of the front barrel 2 is opened, the molten plastic is injected from the feed hole 21, and then flows into the front section 41 of the stock hole through the passage hole 22,
and pushing the pistons and piston rods inside the high-pressure injection plunger 6 and the high-pressure injection oil cylinder 10 to retreat, and after the tail end of the piston body 62 of the high-pressure injection plunger 6 is contacted with the step of the guide sealing hole, the molten plastic simultaneously pushes the pistons and piston rods in the high-pressure injection plunger 6, the low-pressure injection plunger 5, the injection push plate 9, the high-pressure injection oil cylinder 10 and the low-pressure injection oil cylinder 11 to move backwards until the molten plastic enters a material storage hole as required, so that plasticization is completed.
(2) And a low-pressure injection stage:
the nozzle 1 is opened, the feeding hole 21 of the front charging barrel 2 is closed, the low-pressure injection oil cylinder 11 works, the injection push plate 9 is pulled, the low-pressure injection plunger 5, the high-pressure injection oil cylinder 10 and the high-pressure injection plunger 6 are pulled forwards through the injection push plate 9, so that the molten plastic in the storage hole is pushed to be sprayed out of the nozzle 1, low-pressure injection is realized, and the low-pressure injection is stopped until the low-pressure injection plunger 5 is contacted with the step of the storage hole.
(3) And a high-pressure injection stage:
and stopping the low-pressure injection action, switching to the operation of the high-pressure injection oil cylinder 10, entering a high-pressure state, pushing the high-pressure injection plunger 6 to operate by the piston rod of the high-pressure injection oil cylinder 10, pushing the flow passage hole 22 and the molten plastic in the front section 41 of the material storage barrel 4 to be sprayed out from the nozzle 1 by the high-pressure injection plunger 6, realizing high-pressure injection, and finishing the high-pressure injection after the head 61 of the high-pressure injection plunger 6 is contacted with the flow passage hole 22 of the front material barrel 2.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent changes or simple changes of the structure, the characteristics and the principle according to the patent conception of the invention, such as the change of a power mechanism from an oil cylinder to a motor drive, are included in the protection scope of the patent of the invention.
Claims (8)
1. A high-low pressure separated composite injection device comprises a nozzle, a front charging barrel, a charging barrel, an injection plunger, an injection oil cylinder, an injection seat and an injection push plate; the nozzle is fixed with the front charging barrel, the front charging barrel is fixed with the material storage barrel, and the material storage barrel is fixed on the injection seat; a material storage hole is formed in the material storage barrel; a runner hole is arranged in the front charging barrel, one end of the runner hole is communicated with the nozzle, and the other end of the runner hole is communicated with the material storage hole; the front charging barrel is also provided with a feeding hole which is communicated with the runner hole; the method is characterized in that: the injection plunger comprises a low-pressure injection plunger and a high-pressure injection plunger, and the injection oil cylinder comprises a high-pressure injection oil cylinder and a low-pressure injection oil cylinder; the material storage hole is in a step hole shape and is divided into a front section and a rear section, and the aperture of the front section is smaller than that of the rear section; the low-pressure injection plunger is slidably arranged in the rear section of the material storage hole, and the tail end of the low-pressure injection plunger is arranged on the injection push plate; a guide sealing hole is formed in the low-pressure injection plunger, the guide sealing hole is in a step hole shape and is divided into a front section and a rear section, and the aperture of the front section of the guide sealing hole is larger than that of the rear section; the front section of the high-pressure injection plunger is a piston body, the rear section of the high-pressure injection plunger is a plunger rod body, the axial diameter of the piston body is larger than that of the plunger rod body, the piston body is slidably arranged in the front section of the guide sealing hole and the front section of the material storage hole, the plunger rod body is slidably arranged in the rear section of the guide sealing hole, and the tail end of the plunger rod body is connected with a piston rod of the high-pressure injection oil cylinder; the low-pressure injection oil cylinder is fixedly arranged on the injection seat, and a piston rod of the low-pressure injection oil cylinder is connected with the injection push plate; the high-pressure injection oil cylinder is fixed on the injection push plate.
2. The high and low pressure separated compound injection device of claim 1, wherein: the injection device also comprises a fastening nut, and the material storage barrel is fixed on the injection seat by the fastening nut.
3. The high and low pressure separated compound injection device of claim 1, wherein: the front section of the low-pressure injection plunger is a piston body, the rear section of the low-pressure injection plunger is a plunger rod body, the piston body is slidably arranged in the rear section of the material storage hole, and the tail end of the plunger rod body is arranged on the injection push plate.
4. The high and low pressure separated compound injection device of claim 1, wherein: the outer diameter of the front section of the low-pressure injection plunger is larger than that of the rear section.
5. The high and low pressure separated compound injection device of claim 1, wherein: the flow passage hole is conical.
6. The high and low pressure separated compound injection device of claim 5, wherein: the head of the piston body is conical, and the taper is consistent with that of the flow passage hole.
7. The high and low pressure separated compound injection device of claim 1, wherein: the two low-pressure injection oil cylinders are symmetrically and fixedly arranged on two sides of the injection seat.
8. A high-pressure and low-pressure separated composite injection method is characterized in that: the composite injection device of any one of claims 1 to 7, comprising the steps of:
(1) and a feeding stage:
closing the nozzle, opening a feed hole of the front charging barrel, injecting molten plastic from the feed hole, then flowing into the front section of the storage hole through the runner hole, pushing the high-pressure injection plunger and the piston rod in the high-pressure injection oil cylinder to retreat, and after the tail end of the piston body of the high-pressure injection plunger is contacted with the step of the guide sealing hole, simultaneously pushing the piston and the piston rod in the high-pressure injection plunger, the low-pressure injection plunger, the injection push plate, the high-pressure injection oil cylinder and the low-pressure injection oil cylinder to move backwards until the molten plastic enters the storage hole as required, so as to complete plasticization;
(2) and a low-pressure injection stage:
the nozzle is opened, the feeding hole of the front charging barrel is closed, the low-pressure injection oil cylinder works, the injection push plate is pulled, and the low-pressure injection plunger, the high-pressure injection oil cylinder and the high-pressure injection plunger are pulled forwards through the injection push plate, so that the molten plastic in the material storage hole is pushed to be sprayed out of the nozzle, the low-pressure injection is realized, and the low-pressure injection is stopped until the low-pressure injection plunger is contacted with the step of the material storage hole;
(3) and a high-pressure injection stage:
and when the head of the high-pressure injection plunger is contacted with the runner hole of the front charging barrel, the high-pressure injection is finished.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375531.5A CN114228072A (en) | 2021-11-19 | 2021-11-19 | High-pressure and low-pressure separated composite injection device and composite injection method |
| PCT/CN2022/127492 WO2023088048A1 (en) | 2021-11-19 | 2022-10-25 | Separate high-pressure and low-pressure composite injection device and composite injection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375531.5A CN114228072A (en) | 2021-11-19 | 2021-11-19 | High-pressure and low-pressure separated composite injection device and composite injection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114228072A true CN114228072A (en) | 2022-03-25 |
Family
ID=80750190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111375531.5A Withdrawn CN114228072A (en) | 2021-11-19 | 2021-11-19 | High-pressure and low-pressure separated composite injection device and composite injection method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114228072A (en) |
| WO (1) | WO2023088048A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023088048A1 (en) * | 2021-11-19 | 2023-05-25 | 德清申达机器制造有限公司 | Separate high-pressure and low-pressure composite injection device and composite injection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB501277A (en) * | 1937-08-21 | 1939-02-21 | Henry Grafton | Improvements in and relating to the moulding of thermoplastic materials by injection |
| GB656415A (en) * | 1947-09-08 | 1951-08-22 | Carl Christian Gravesen | Injection cylinder assembly for injection moulding machines |
| CN106827427A (en) * | 2016-12-02 | 2017-06-13 | 湖北工业大学 | A kind of high pressure plasticizing of macromolecular material and injecting method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114228072A (en) * | 2021-11-19 | 2022-03-25 | 德清申达机器制造有限公司 | High-pressure and low-pressure separated composite injection device and composite injection method |
-
2021
- 2021-11-19 CN CN202111375531.5A patent/CN114228072A/en not_active Withdrawn
-
2022
- 2022-10-25 WO PCT/CN2022/127492 patent/WO2023088048A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB501277A (en) * | 1937-08-21 | 1939-02-21 | Henry Grafton | Improvements in and relating to the moulding of thermoplastic materials by injection |
| GB656415A (en) * | 1947-09-08 | 1951-08-22 | Carl Christian Gravesen | Injection cylinder assembly for injection moulding machines |
| CN106827427A (en) * | 2016-12-02 | 2017-06-13 | 湖北工业大学 | A kind of high pressure plasticizing of macromolecular material and injecting method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023088048A1 (en) * | 2021-11-19 | 2023-05-25 | 德清申达机器制造有限公司 | Separate high-pressure and low-pressure composite injection device and composite injection method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023088048A1 (en) | 2023-05-25 |
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Application publication date: 20220325 |
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