Anti-jamming method and device for hydraulic vacuum valve

Abstract

The invention relates to an anti-jamming method and device for a hydraulic vacuum valve. The method comprises the following steps: arranging an oil storage tank in a guide copper bush structure of a vacuumizing valve body of the die-casting die, and filling lubricating grease in the oil storage tank; sealing check ring mounting grooves are machined in the two sides of the oil storage tank, and sealing check rings are mounted in the mounting grooves; aluminum scraps are effectively prevented from entering the matching position of the valve rod and the copper guide sleeve, and frictional wear caused by mutual movement of the valve rod and the copper guide sleeve is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of die-casting molds and relates to a method and a device for preventing a hydraulic vacuum valve from being stuck. Background Art

[0002] A high vacuum environment is required during the production process of die-casting molds to reduce defects such as porosity in castings and improve the quality of castings. Therefore, a vacuum pumping system is set for the die-casting mold. Its working principle is to use a vacuum machine to evacuate the inside of the cavity after the mold is closed, and set the position to close during the injection of molten aluminum to prevent the molten aluminum from entering the vacuum pipeline, thereby circulating.

[0003] At present, the structure of hydraulic vacuum valves at home and abroad mainly relies on a copper guide sleeve to control the stable movement direction of the piston rod. When the working environment is good and there is less accumulation of aluminum chips in the valve, it can work effectively by relying on the strong wear resistance of the brass material itself. However, in the actual production process, on the one hand, the vacuum valve piston rod and the copper guide sleeve move against each other at a high frequency, resulting in friction and wear. On the other hand, aluminum chips can easily enter the vacuum valve during the vacuum pumping process. Once entering the gap between the piston rod and the guide copper sleeve, it will cause strain inside the copper guide sleeve. In severe cases, it will cause the piston rod to get stuck, leading to serious consequences such as interruption of injection, sticking to the mold, and even aluminum liquid entering the vacuum system.

[0004] like Figure 1 As shown, the mechanical movement principle of the design of the vacuum valve body of the die-casting mold in the prior art is that the movable piston rod uses a hydraulic cylinder to control the movement of the piston rod in the copper guide sleeve to open and close the vacuum valve. In actual use, the mold vacuum system works in a high temperature, humid, and oily environment. Its vacuum pull rod is prone to rust, and the accumulation of impurities such as sludge and aluminum chips causes the vacuum pull rod to jam or even get stuck, resulting in it being unable to close normally. At the least, the equipment alarms and stops production. At the worst, aluminum liquid enters the vacuum pipeline, causing damage to the equipment and mold, seriously affecting production efficiency.

[0005] like Figure 5 , Figure 6 , Figure 7As shown, patent document CN205013697U discloses a vacuum valve on a die-casting mold, including a valve body, a valve cavity is provided on the valve body, a valve core is provided in the valve cavity which can move left and right or relatively with the valve body, a gap is left between the valve core and the inner wall of the valve cavity, the right end of the valve core is exposed outside the valve body, the right end of the valve core is adapted to the right end of the valve cavity, so that after the valve core moves a certain distance to the left relative to the valve body, the right end of the valve core is sealed against the right end of the valve cavity, the valve body is connected to the driving mechanism, and a vacuum joint connected to the valve cavity is provided on the valve body, and the vacuum joint is connected to the vacuum machine. The gas in the die cavity of the die-casting mold is actively extracted by the vacuum machine, the formation of pores inside the product is reduced, the internal quality of the product is improved, the die-casting scrap rate is reduced, and the cost is reduced. In addition, the vacuum valve is simple to operate, easy to replace and maintain, and has a stable structure.

[0006] The above patent documents reflect the defects and shortcomings of the existing technology. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art and provide a method and device for preventing a hydraulic vacuum valve from getting stuck.

[0008] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0009] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0010] A method for preventing a hydraulic vacuum valve from jamming, characterized in that:

[0011] An oil storage tank is arranged inside the guide copper sleeve structure of the vacuum valve body of the die-casting mold, and the oil storage tank is filled with grease.

[0012] Furthermore, sealing retaining ring installation grooves are processed on both sides of the oil storage tank, and sealing retaining rings are installed in the installation grooves.

[0013] Furthermore, the sealing retaining ring is a PDR pneumatic dustproof ring of matching size.

[0014] Furthermore, the lubricating grease is molybdenum disulfide high temperature water-resistant lubricating grease.

[0015] Furthermore, the oil storage tank has a depth of 3 mm.

[0016] Furthermore, the guide copper sleeve is provided with an indication mark for distinguishing and identifying the installation direction of the guide copper sleeve.

[0017] Furthermore, the installation direction of the sealing retaining ring should match the installation direction of the guide copper sleeve, so as to prevent aluminum chips from entering the gap between the guide copper sleeve and the piston rod.

[0018] A hydraulic vacuum valve anti-stuck device comprises a guide copper sleeve structure and a piston rod;

[0019] An oil storage tank is arranged inside the guide copper sleeve structure.

[0020] Furthermore, sealing retaining ring installation grooves are arranged on both sides of the oil storage tank.

[0021] Furthermore, a sealing ring is arranged in the sealing ring installation groove.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The invention effectively prevents aluminum chips from entering the matching position of the valve stem and the copper guide sleeve, and reduces the friction and wear when the valve stem and the copper guide sleeve move relative to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a cross-sectional view of the internal structure of a hydraulic vacuum valve in the prior art;

[0026] Figure 2 Schematic diagram of installing pneumatic dust ring and machining copper guide sleeve of oil storage tank;

[0027] Figure 3 Schematic diagram of the hydraulic vacuum valve anti-stuck device of the present invention Figure 1 ;

[0028] Figure 4 Schematic diagram of the hydraulic vacuum valve anti-stuck device of the present invention Figure 2 ;

[0029] Figure 5 This is a schematic diagram of patent document CN205013697U Figure 1 ;

[0030] Figure 6 This is a schematic diagram of patent document CN205013697U Figure 2 ;

[0031] Figure 7 This is a schematic diagram of patent document CN205013697U Figure 3 . DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0034] The present invention is described in detail below in conjunction with the accompanying drawings:

[0035] The present invention redesigns and manufactures the original guide copper sleeve structure of the die-casting mold vacuum valve body in the prior art, sets an oil storage tank inside, fills grease during installation to provide lubrication, and adds a special sealing ring to prevent aluminum chips from entering the vacuum valve body and accumulating over time to cause the vacuum valve piston rod to jam. It has been proven that this method can effectively ensure the stable operation of the vacuum system.

[0036] The present invention provides an embodiment, a method for preventing a hydraulic vacuum valve from getting stuck, which is based on strengthening the lubrication of a piston rod and a copper guide sleeve. By modifying the vacuum copper sleeve, the problem of aluminum chips entering the matching position of the valve stem and the copper guide sleeve is effectively solved, and the friction and wear of the valve stem and the copper guide sleeve when they move relative to each other is reduced.

[0037] Improved process:

[0038] 1. Process the oil storage tank inside the original copper sleeve (such as Figure 2 (shown)

[0039] The depth of the oil storage tank can be processed according to the actual situation, which mainly affects the oil storage capacity and the cycle time. For example, with a 3mm tank depth, the oil storage capacity can reach 1250mm 3, it can be used 10,000 times, and can be adjusted appropriately according to the maintenance cycle.

[0040] 2. Machine sealing ring installation grooves on both sides of the oil storage tank (such as Figure 2 (shown)

[0041] 3. Select a suitable size PDR pneumatic dust ring and install it in the groove (such as Figure 2 (shown)

[0042] PDR type dust seal is a type of dust seal with a sharp lip structure, suitable for preventing external dust, sand and water pollutants from entering the sealed cylinder.

[0043] 4. Fill the oil tank with high-temperature grease, such as Figure 3 The figure shows the cross-sectional view of the modified copper guide sleeve after installation. The lubricating grease is molybdenum disulfide high temperature and water-resistant lubricating grease.

[0044] It is not advisable to use high-fluidity grease for high-temperature grease to prevent overflow and adverse effects such as flowing into the mold cavity and reducing the service life.

[0045] Pay attention to the installation direction of the vacuum copper sleeve. In order to facilitate identification, the indicator mark can be processed on the outside of the copper sleeve. This time we choose to distinguish it by processing large-size chamfers. You can choose the appropriate distinction method according to the actual situation, such as directly marking text.

[0046] The installation direction of the vacuum copper sleeve also affects the installation direction of the PDR dust ring. The correct installation direction of the dust ring can prevent aluminum chips from entering the gap between the guide sleeve and the piston rod, and ensure the self-cleaning and self-lubricating of the piston rod.

[0047] The processing method of the sealing retaining ring installation groove shall be based on the drawing. The direction has been designed. The sealing retaining ring only needs to be installed in the matching direction of the sealing retaining ring installation groove. After the sealing retaining ring is installed, the guide copper sleeve can be installed on the mold as a whole according to the direction marked on the guide copper sleeve shape, so that the installation direction of the sealing retaining ring and the guide copper sleeve can be matched.

[0048] The present invention provides another embodiment, a hydraulic vacuum valve anti-stuck device, such as Figure 3 , Figure 4 As shown, it includes a guide copper sleeve structure and a piston rod; an oil storage tank is arranged inside the guide copper sleeve structure. The oil storage tank is filled with grease. High-temperature grease should not be selected from products with good fluidity to prevent overflow and flow into the mold cavity, reduce the use time and other adverse effects.

[0049] Sealing ring installation grooves are arranged on both sides of the oil storage tank. Sealing rings are arranged in the sealing ring installation grooves to prevent aluminum chips from entering the vacuum valve body and accumulating over time to cause the vacuum valve piston rod to jam.

[0050] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A method for preventing a hydraulic vacuum valve from jamming, characterized in that: An oil storage tank is arranged inside the guide copper sleeve structure of the vacuum valve body of the die-casting mold, and the oil storage tank is filled with grease.

2. A method for preventing a hydraulic vacuum valve from jamming according to claim 1, characterized in that: Sealing retaining ring installation grooves are machined on both sides of the oil storage tank, and sealing retaining rings are installed in the installation grooves.

3. A method for preventing a hydraulic vacuum valve from jamming according to claim 2, characterized in that: The sealing retaining ring is a PDR pneumatic dust seal of matching size.

4. A method for preventing a hydraulic vacuum valve from jamming according to claim 1, characterized in that: The lubricating grease is molybdenum disulfide high temperature water-resistant lubricating grease.

5. A method for preventing a hydraulic vacuum valve from jamming according to claim 1, characterized in that: The oil storage tank has a depth of 3 mm.

6. A method for preventing a hydraulic vacuum valve from jamming according to claim 1, characterized in that: The guide copper sleeve is provided with an indication mark for distinguishing and identifying the installation direction of the guide copper sleeve.

7. A method for preventing a hydraulic vacuum valve from jamming according to claim 1, characterized in that: The installation direction of the sealing retaining ring should match the installation direction of the guide copper sleeve, so as to prevent aluminum chips from entering the gap between the guide copper sleeve and the piston rod.

8. A hydraulic vacuum valve anti-stuck device, characterized in that: Including a guide copper sleeve structure; An oil storage tank is arranged inside the guide copper sleeve structure.

9. A hydraulic vacuum valve anti-stuck device according to claim 8, characterized in that: Sealing retaining ring installation grooves are arranged on both sides of the oil storage tank.

10. A hydraulic vacuum valve anti-stuck device according to claim 9, characterized in that: A sealing ring is arranged in the sealing ring installation groove.

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