CN218505133U - Low resistance injection cylinder structure - Google Patents
Low resistance injection cylinder structure Download PDFInfo
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- CN218505133U CN218505133U CN202222356433.3U CN202222356433U CN218505133U CN 218505133 U CN218505133 U CN 218505133U CN 202222356433 U CN202222356433 U CN 202222356433U CN 218505133 U CN218505133 U CN 218505133U
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- 238000002347 injection Methods 0.000 title claims abstract description 36
- 239000007924 injection Substances 0.000 title claims abstract description 36
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 166
- 230000006872 improvement Effects 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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Abstract
The utility model provides a low resistance injection hydro-cylinder structure, is including controlling coaxial setting's time hydro-cylinder and oil feed jar, and the right-hand member of advancing the hydro-cylinder is equipped with the oil feed cylinder cap, and the left end is connected with the time hydro-cylinder through the connecting plate, is equipped with oil feed piston and oil feed piston rod in the oil feed jar, and the internal diameter of time hydro-cylinder is less than the internal diameter of advancing the hydro-cylinder, and the left end of time hydro-cylinder is equipped with the time hydro-cylinder cap, is equipped with time return piston and time return piston rod in the time hydro-cylinder. The structure of the traditional double-acting single oil cylinder is improved into a double-oil cylinder structure, a single-acting return oil cylinder with smaller inner diameter is additionally arranged, and an oil return piston rod are arranged in the oil return cylinder, so that the effective area of an oil return cavity is greatly reduced, the oil return flow rate is also greatly reduced, and the oil return resistance is reduced. The utility model has the advantages of simple and reasonable structure, effectively solved the problem that the oil return resistance is big, the oil circuit noise is big.
Description
Technical Field
The utility model belongs to the technical field of and plastic injection molding machine, a injection cylinder structure that plastic injection molding machine injection part was used is related to, concretely relates to low resistance injection cylinder structure.
Background
An injection molding machine is also known as an injection molding machine or an injection machine. It is a main forming equipment for making various shaped plastic products from thermoplastic plastics or thermosetting plastics by using plastic forming mould. The injection mechanism is one of the key components of the injection machine, and mainly injects the plastic in a plasticized molten state (i.e. viscous state) into a closed mold cavity by driving a screw (or a plunger) to move through an injection oil cylinder. The injection mechanism of the plastic injection molding machine produced by various manufacturers at present has a single oil cylinder structure basically with a traditional double-acting single oil cylinder structure, as shown in fig. 1, the main structure comprises an oil cylinder 1a, a front cylinder cover 4a, a rear cylinder cover 5a, a piston 2a and a piston rod 3a, an injection oil inlet 40 is arranged on the front cylinder cover 4a, an injection oil return port 50 is arranged on the rear cylinder cover 5a, and the injection mechanism is characterized in that a rod cavity is filled with pressure oil through the injection oil inlet 40, the piston 2a and the piston rod 3a are pushed to drive related parts and a screw to perform injection action, and a rodless cavity returns oil through the injection oil return port 40 under the action of the piston 2 a. The double-acting single oil cylinder structure is simple and mature in machining and assembling process, but the effective area of the oil return cavity is obviously larger than that of the oil inlet cavity, so that when oil returns from the oil return cavity, the oil return flow rate ratio of hydraulic oil in the rodless cavity is large, certain oil return resistance can be generated, and the noise of an oil way is large.
Through inspection, the Chinese patent CN202022557798.3, an injection cylinder structure of an injection molding machine, comprises an oil cylinder barrel and a piston hermetically connected with the inner peripheral wall of the oil cylinder barrel, wherein the piston can slide in the oil cylinder barrel in a reciprocating manner, and the injection cylinder structure is characterized in that: the two ends of the piston are respectively and coaxially connected with a first piston rod and a second piston rod, one end of the first piston rod penetrates through one end of the oil cylinder barrel, the diameter of the second piston rod is larger than that of the first piston rod, and one end of the second piston rod penetrates through the other end of the oil cylinder barrel. The injection oil cylinder structure adopts a single oil cylinder structure, although the effective area of an oil return cavity is reduced to some extent, the injection oil cylinder structure is not ideal enough, and the problems of large oil return resistance and large oil circuit noise exist.
Disclosure of Invention
The utility model aims to solve the technical problem that a low resistance injection cylinder structure that structural design is reasonable, the oil return resistance is little, the oil circuit noise is little is provided.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a low resistance injection cylinder structure which characterized in that: the oil return cylinder and the oil inlet cylinder are coaxially arranged on the left and right sides, an oil inlet cylinder cover is arranged at the right end of the oil inlet cylinder, the left end of the oil inlet cylinder is connected with the oil return cylinder through a connecting plate, an oil inlet piston and an oil inlet piston rod are arranged in the oil inlet cylinder, the inner diameter of the oil return cylinder is smaller than that of the oil inlet cylinder, an oil return cylinder cover is arranged at the left end of the oil return cylinder, an oil return piston and an oil return piston rod are arranged in the oil return cylinder, and the oil inlet piston and the oil return piston are in linkage.
As an improvement, the oil return piston rods are coaxially arranged two, the left end of the first oil return piston rod is connected with the oil return piston, the right end of the first oil return piston rod penetrates through the connecting plate to be connected with the left end of the oil inlet piston, the right end of the second oil return piston rod is connected with the oil return piston, and the left end of the second oil return piston rod extends out of the oil return cylinder cover.
Furthermore, an oil inlet is arranged on the oil inlet cylinder cover, an oil return port is arranged on the oil return cylinder cover, an oil return cavity is formed between the oil return piston and the oil return cylinder cover, an oil inlet cavity is formed between the oil inlet piston and the oil inlet cylinder cover, the left end of the oil inlet piston rod is connected with the right end of the oil inlet piston, and the right end of the oil inlet piston rod extends out of the oil inlet cylinder cover.
Furthermore, the connecting plate is of a stepped circular sleeve structure with a large left-side diameter and a small right-side diameter, the right end of the connecting plate is consistent with the inner diameter of the oil inlet cylinder, the right end of the connecting plate is inserted into the oil inlet cylinder for positioning, a central through hole with a large left-side inner diameter and a small right-side inner diameter is formed in the middle of the connecting plate, the left side diameter of the central through hole is consistent with the outer diameter of the oil return cylinder, the left end of the oil return cylinder is inserted into the left side of the central through hole of the connecting plate for fixing, and the right end of the first oil return piston rod penetrates through the central through hole to be connected with the oil inlet piston.
And finally, two exhaust ports parallel to the central through hole are formed in the connecting plate, one exhaust port is connected with the inner cavities of the oil inlet cylinder and the oil return cylinder, and the other exhaust port is connected with the inner cavity of the oil inlet cylinder and the outside.
Compared with the prior art, the utility model has the advantages of: the structure of the traditional double-acting single oil cylinder is improved into a double-oil cylinder structure, a single-acting return oil cylinder with smaller inner diameter is additionally arranged, and an oil return piston rod are arranged in the oil return cylinder, so that the effective area of an oil return cavity is greatly reduced, the oil return flow rate is also greatly reduced, and the oil return resistance is reduced. The utility model has the advantages of simple and reasonable structure, effectively solved the big, the big problem of oil circuit noise of oil return resistance, obtained following advantage simultaneously: the oil return flow rate is low, and the leakage risk of a sealing element is reduced; (2) the oil return pressure is small, and the injection pressure loss is reduced; (3) the flow rate is reduced, and the noise of an oil return cavity is reduced; (4) The valve over-flow speed is reduced, and the valve with large drift diameter can be reduced to be used as a valve with small drift diameter, so that the cost of the valve is reduced, and the response speed and the control precision of the valve are increased.
Drawings
FIG. 1 is a schematic structural diagram of a conventional injection cylinder before improvement;
fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following examples of the drawings.
As shown in fig. 2, a low-resistance injection oil cylinder structure comprises a return oil cylinder 2 and an oil inlet cylinder 1 which are coaxially arranged on the left and right, wherein an oil inlet cylinder cover 5 is arranged at the right end of the oil inlet cylinder 1, the left end of the oil inlet cylinder is connected with the return oil cylinder 2 through a connecting plate 10, an oil inlet piston 3 and an oil inlet piston rod 4 are arranged in the oil inlet cylinder 1, the inner diameter of the return oil cylinder 2 is smaller than that of the oil inlet cylinder 1, an oil return cylinder cover 9 is arranged at the left end of the oil return cylinder 2, and an oil return piston 6 and oil return piston rods 7 and 8 are arranged in the oil return cylinder 2. The oil return piston rods 7 and 8 are coaxially arranged two, the left end of the first oil return piston rod 7 is connected with the oil return piston 6, the right end of the first oil return piston rod passes through the connecting plate 10 to be connected with the left end of the oil inlet piston 3, the right end of the second oil return piston rod 8 is connected with the oil return piston 6, and the left end of the second oil return piston rod extends out of the oil return cylinder cover 9. An oil inlet 51 is formed in the oil inlet cylinder cover 5, an oil return port 91 is formed in the oil return cylinder cover 9, an oil return cavity is formed between the oil return piston 6 and the oil return cylinder cover 9, and an oil inlet cavity is formed between the oil inlet piston 3 and the oil inlet cylinder cover 5. The left end of the oil inlet piston rod 4 is connected with the right end of the oil inlet piston 3, and the right end of the oil inlet piston rod 4 extends out of the oil inlet cylinder cover 5. The connecting plate 10 is of a stepped circular sleeve structure with a large left side diameter and a small right side diameter, the right end of the connecting plate 10 is consistent with the inner diameter of the oil inlet cylinder 1, the right end of the connecting plate 10 is inserted into the oil inlet cylinder 1 to be positioned, a central through hole with a large left side inner diameter and a small right side inner diameter is formed in the middle of the connecting plate 10, the left side diameter of the central through hole is consistent with the outer diameter of the oil return cylinder 2, the left end of the oil return cylinder 2 is inserted into the left side of the central through hole of the connecting plate 10 to be fixed, and the right end of the first oil return piston rod 7 penetrates through the central through hole to be connected with the oil inlet piston 3. Two exhaust ports a and b parallel to the central through hole are arranged on the connecting plate 10, wherein one exhaust port a is connected with the inner cavities of the oil inlet cylinder 1 and the oil return cylinder 2, and the other exhaust port b is connected with the inner cavity of the oil inlet cylinder 1 and the outside.
In the case of the same injection pressure and speed requirements, the dimension parameters of the injection oil inlet and the connected injection cavity are consistent with the scheme before improvement, and the oil return cavity is replaced by a connected single-acting oil cylinder with a smaller inner diameter. When the oil return device works, pressure oil is fed into the rod cavity through the injection oil inlet 51 to push the oil feeding piston 3, the oil return piston 6 and the oil return piston rods 7 and 8, the volume of an oil cavity of the left single-action return oil cylinder 2 is reduced, and the oil return flow rate is also greatly reduced due to the fact that the effective area of the oil return cavity is greatly reduced, so that oil return resistance is reduced.
The effective area of the oil return cavity of the embodiment is calculated according to the inner diameter of the oil return cylinder 2 and the size of the second oil return piston rod 8, the effective area of the oil return cavity of the embodiment is reduced by about 20% compared with that before improvement, so that the oil return flow rate is also reduced by one fifth of the original flow rate, and the oil return resistance is greatly reduced.
The utility model discloses following advantage has been obtained: the oil return flow rate is low, and the leakage risk of a sealing element is reduced; (2) the oil return pressure is small, and the injection pressure loss is reduced; (3) the flow rate is reduced, and the noise of the oil return cavity is reduced; (4) The over-current speed of the valve is reduced, the valve with a large drift diameter can be degraded into a valve with a small drift diameter for use, the cost of the valve is reduced, and the response speed and the control precision of the valve are increased.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides a low resistance injection cylinder structure which characterized in that: the oil return device comprises a left oil return cylinder and a right oil return cylinder which are coaxially arranged, wherein an oil inlet cylinder cover is arranged at the right end of the oil inlet cylinder, the left end of the oil inlet cylinder is connected with the oil return cylinder through a connecting plate, an oil inlet piston and an oil inlet piston rod are arranged in the oil inlet cylinder, the inner diameter of the oil return cylinder is smaller than that of the oil inlet cylinder, an oil return cylinder cover is arranged at the left end of the oil return cylinder, an oil return piston and an oil return piston rod are arranged in the oil return cylinder, and the oil inlet piston and the oil return piston are linked.
2. The low drag injection cylinder structure of claim 1 wherein: the oil return piston rods are coaxially arranged two, the left end of the first oil return piston rod is connected with the oil return piston, the right end of the first oil return piston rod penetrates through the connecting plate to be connected with the left end of the oil inlet piston, the right end of the second oil return piston rod is connected with the oil return piston, and the left end of the second oil return piston rod extends out of the oil return cylinder cover.
3. The low drag injection cylinder structure of claim 2 wherein: the oil inlet cylinder cover is provided with an oil inlet, the oil return cylinder cover is provided with an oil return port, an oil return cavity is formed between the oil return piston and the oil return cylinder cover, an oil inlet cavity is formed between the oil inlet piston and the oil inlet cylinder cover, the left end of an oil inlet piston rod is connected with the right end of the oil inlet piston, and the right end of the oil inlet piston rod extends out of the oil inlet cylinder cover.
4. The low drag injection cylinder structure of claim 3 wherein: the connecting plate is of a stepped circular sleeve structure with a large left-side diameter and a small right-side diameter, the right end of the connecting plate is consistent with the inner diameter of the oil inlet cylinder, the right end of the connecting plate is inserted into the oil inlet cylinder for positioning, a central through hole with a large left-side inner diameter and a small right-side inner diameter is formed in the middle of the connecting plate, the left-side diameter of the central through hole is consistent with the outer diameter of the oil return cylinder, the left end of the oil return cylinder is inserted into the left side of the central through hole of the connecting plate for fixing, and the right end of the first oil return piston rod penetrates through the central through hole to be connected with the oil inlet piston.
5. A low resistance injection cylinder structure of any of claims 1 to 4 wherein: two exhaust ports parallel to the central through hole are formed in the connecting plate, one exhaust port is connected with the inner cavities of the oil inlet cylinder and the oil return cylinder, and the other exhaust port is connected with the inner cavity of the oil inlet cylinder and the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222356433.3U CN218505133U (en) | 2022-09-05 | 2022-09-05 | Low resistance injection cylinder structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222356433.3U CN218505133U (en) | 2022-09-05 | 2022-09-05 | Low resistance injection cylinder structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218505133U true CN218505133U (en) | 2023-02-21 |
Family
ID=85210748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222356433.3U Active CN218505133U (en) | 2022-09-05 | 2022-09-05 | Low resistance injection cylinder structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218505133U (en) |
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2022
- 2022-09-05 CN CN202222356433.3U patent/CN218505133U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 315400 Simen Town Industrial Park, Yuyao City, Zhejiang Province Patentee after: Ningbo Chuangji Machinery Co.,Ltd. Address before: 315400 Simen Town Industrial Park, Yuyao City, Zhejiang Province Patentee before: NINGBO LOG MACHINERY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |