Injection oil cylinder of injection molding machine
By designing separate injection and release ends in the injection cylinder and setting a hollow structure in the release end, the problem of return oil resistance during high-speed return oil is solved, achieving medium and low injection pressure and high-speed injection, improving product quality and simplifying structural design.
Patent Information
- Application Number
- CN202423030952.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-09
AI Technical Summary
The injection cylinder of the existing twin-cylinder injection molding machine has large oil return resistance at high speed, resulting in a decrease in injection speed, affecting the molding quality of thin-walled and long-flow-length-ratio products. Conventional improvement solutions also increase cost and complexity.
Design an injection cylinder by dividing the piston rod into an injection end and a release end, and setting a hollow structure in the release end to reduce the volume and effective cross-sectional area of the release chamber, reduce the return oil resistance, and optimize the cylinder structure to achieve medium and low injection pressure and high-speed injection.
It effectively solves the problems of pressure loss and speed reduction caused by return oil resistance, ensures product quality, simplifies the structure and reduces costs.
Smart Images
Figure CN223466659U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to injection molding machine field, concretely is a kind of injection molding machine injection oil cylinder. BACKGROUND
[0002] The existing double-cylinder injection molding machine injection oil cylinder is divided into rod cavity and rodless cavity by piston. When high-speed injection, hydraulic oil enters rod cavity to form pressure to push piston to move to rodless cavity. Rodless cavity has large hydraulic oil volume, and the effective cross-sectional area of the piston on one side of the rodless cavity is large. When instant high-speed oil return, large oil return flow leads to large oil return resistance, causing large oil cylinder pressure loss and injection speed drop. When producing thin-walled products with long flow ratio, medium-low injection pressure and high-speed injection molding are required, otherwise defects such as excessive internal stress of products, product deformation and even product not full will occur. Common solutions include increasing the diameter of the oil return pipeline and valve, but this will cause the size of related parts such as oil plate to be larger, the cost is high, the overall structure is complex, and the product is not beautiful. SUMMARY
[0003] The utility model aims to provide an injection molding machine injection oil cylinder which can realize medium-low injection pressure and high-speed injection molding and solve the defects such as excessive internal stress of products, product deformation and even product not full.
[0004] The above object is achieved as follows.
[0005] An injection molding machine injection oil cylinder includes an oil cylinder body, a piston, a piston rod, a first oil cylinder cover and a second oil cylinder cover. The first oil cylinder cover and the second oil cylinder cover are fixedly arranged at the two ends of the oil cylinder body and seal the oil cylinder body to form a sealed cavity inside the oil cylinder body. The piston is arranged in the sealed cavity and divides the sealed cavity into an injection chamber and a relaxation chamber. The piston is fixedly connected with the piston rod, the piston rod passes through the axis of the piston, and the two ends of the piston rod extend to the first oil cylinder cover and the second oil cylinder cover respectively. The piston rod passing through the injection chamber is the injection end, and the piston rod passing through the relaxation chamber is the relaxation end.
[0006] The utility model can also be optimized by the following technical measures.
[0007] Preferably, the first oil cylinder cover is provided with a first oil port, and the second oil cylinder cover is provided with a second oil port.
[0008] Preferably, the first oil cylinder cover is provided with an injection sheath, and the part of the relaxation end that passes through the first oil cylinder cover is arranged in the injection sheath.
[0009] Preferably, the relaxation end is hollow.
[0010] Preferably, the injection sheath is provided with a connecting hole connected with a displacement mechanism.
[0011] Adopt above technical scheme, the utility model discloses through setting loose end and makes the volume of loose chamber and the effective cross-sectional area of loose chamber piston greatly reduce, when instant high -speed oil return, oil cylinder oil return resistance is small, pressure loss is small, speed drops little, can effectively solve the product defect of the production thin -walled, long product due to the oil return resistance of long ratio, pressure loss is larger, speed drops cause. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is the schematic view of injection oil cylinder.
[0013] Figure 2 It is another schematic view of injection oil cylinder.
[0014] Figure 3 It is Figure 2 A-A section view of.
[0015] Figure 4 It is another section view of injection oil cylinder. DETAILED DESCRIPTION
[0016] The utility model will be further explained below in combination with the drawings and specific embodiment.
[0017] In combination Figure 1 , a kind of injection molding machine injection oil cylinder, including oil cylinder body 2, piston 6, piston rod, first oil cylinder cover 5, second oil cylinder cover 7.
[0018] In combination Figure 2 , first oil cylinder cover 5 and second oil cylinder cover 7 are fixedly arranged at the both ends of oil cylinder body 2 respectively and seal oil cylinder body 2 to make its inside form airtight cavity.
[0019] In combination Figure 2 With Figure 3 , first oil cylinder cover 5 is equipped with first oil port 23, and second oil cylinder cover 7 is equipped with second oil port 24, when oil cylinder works, first oil port 23 and second oil port 24 can be filled with oil, can also discharge oil. The piston is arranged in airtight cavity, and airtight cavity is divided into loose chamber 21 and injection chamber 22.
[0020] The piston 6 is fixedly connected with the piston rod, the piston rod passes through the axis of the piston 6, and the two ends of the piston rod extend to the first oil cylinder cover 5 and the second oil cylinder cover 7 respectively. The piston rod is provided with a first oil cylinder cover 5, a first oil cylinder cover 4 and a second oil cylinder cover 7, a second oil cylinder cover 8, and the piston rod passing through the injection chamber 22 is an injection end 32. The piston rod passing through the loose chamber 21 is a loose chamber 21. The inside of the loose end 31 is hollow. The hollow setting is to reduce the weight of the piston rod in the loose chamber 21, so that the installation is more relaxed.
[0021] The first oil cylinder cover 5 is externally provided with an injection sheath 1, the part of the loosening end 31 penetrating out of the first oil cylinder cover 5 is arranged in the injection sheath 1, the injection sheath 1 is provided with a connecting hole 11 connected with the displacement mechanism, the injection sheath 1 can prevent the impact danger generated by the reciprocating movement of the piston rod, and can also connect the displacement mechanism to realize the forward and backward reciprocating movement of the whole injection oil cylinder component.
Claims
1. An injection cylinder of an injection molding machine, comprising a cylinder body, a piston, a piston rod, a first cylinder cover and a second cylinder cover, the first and second cylinder covers are fixedly arranged at two ends of the cylinder body respectively and seal the cylinder body to form a closed cavity inside the cylinder body, the piston is arranged in the closed cavity and divides the closed cavity into an injection chamber and a decompression chamber, characterized in that: The piston is fixedly connected with a piston rod, the piston rod passes through the axis of the piston, and the two ends of the piston rod extend to the first oil cylinder cover and the second oil cylinder cover respectively, and the two ends of the piston rod are respectively arranged on the first oil cylinder cover and the second oil cylinder cover, the piston rod passing through the injection cavity is the injection end, and the piston rod passing through the stripping cavity is the stripping end.
2. An injection cylinder for an injection molding machine as defined in claim 1, characterized in that: The first oil cylinder cover is provided with a first oil passage, and the second oil cylinder cover is provided with a second oil passage.
3. The injection cylinder of claim 1, wherein: The first oil cylinder cover is externally provided with an injection sheath, and the part of the stripping end passing out of the first oil cylinder cover is arranged in the injection sheath.
4. Injection cylinder of an injection molding machine according to claim 1 or 3, characterized in that The stripping end is hollow.
5. The injection cylinder of claim 3, wherein: The injection sheath is provided with a connecting hole connected with the displacement mechanism.