Oil filling structure for reducing air entering into pressure cylinder

Abstract

The utility model discloses an oil filling structure capable of reducing air entering into a pressure cylinder, which comprises an auxiliary oil tank, the auxiliary oil tank is communicated with the pressure cylinder, a mounting plate is arranged on the pressure cylinder, two ends of the mounting plate are respectively used for fixing the auxiliary oil tank and a cylinder barrel of the pressure cylinder, a through hole communicated with the cylinder barrel is processed in the mounting plate, and an oil filling valve is arranged on the mounting plate. The two ends of the oil filling valve are communicated with the through hole and the U-shaped pipe respectively, and the U-shaped pipe is communicated with the auxiliary oil tank which is provided with a breather valve. According to the device, oil in the auxiliary oil tank is sucked into the cylinder barrel of the pressure cylinder along the U-shaped pipe through the oil filling valve, the oil suction mode is from top to bottom, air entering the cylinder barrel is reduced, and the high-pressure mold clamping force is better maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of local improvement design of oil cylinder structures, in particular to an oil filling structure for reducing the ingress of air into a boost cylinder. Background Art

[0002] At present, the booster cylinder of the injection molding machine sucks oil from bottom to top. It is difficult to eliminate the presence of air in the pipeline during operation. It is difficult to achieve reliable efficiency with large oil filling valves. The high-pressure clamping time is difficult to confirm, resulting in unstable production cycles and it is difficult to ensure the duration of high-pressure clamping force.

[0003] In the prior art, the patent with announcement number CN217481627U discloses a split servo booster cylinder, including a cylinder body, an oil barrel and a supercharger, wherein a delivery pipe is connected between the cylinder body and the oil barrel, and one end of the delivery pipe is connected to the bottom end of the oil barrel, and the other end is connected to the top end of the cylinder body, and an oil passage is formed between the cylinder body and the oil barrel through the delivery pipe, and the supercharger is located at the oil barrel and connected to the oil passage to squeeze the oil in the delivery pipe. The utility model split servo booster cylinder, by connecting the delivery pipe between the cylinder body and the oil barrel, can place the cylinder body and the oil barrel in different places when the booster cylinder is in use, so that the booster cylinder is suitable for various harsh occasions, thereby improving the adaptability of the booster cylinder; at the same time, the mechanized structure of the servo motor and the screw drive can make the design of the booster cylinder reasonable, and make the positioning of the booster cylinder more accurate when boosting, thereby reducing the use requirements of the booster cylinder. Although a delivery pipe is connected between the cylinder body and the oil barrel, its function is to place the cylinder body and the oil barrel in different places respectively, and it cannot solve the technical problem of stabilizing the clamping force during high-pressure operation.

[0004] The patent with announcement number CN218817290U discloses a hydraulic booster cylinder, including a main cylinder body, a booster cylinder body and an oil storage cylinder body; wherein, the main cylinder body includes a front cylinder barrel and a rear cylinder barrel, an auxiliary cylinder barrel is arranged on one side of the front cylinder barrel, the front cylinder barrel and the auxiliary cylinder barrel are connected by a front locking block, a front flange is arranged on one end of the auxiliary cylinder barrel, an oil piston is arranged in the rear cylinder barrel, a main piston rod is arranged on the oil piston, and an air piston is arranged in the front cylinder barrel; the booster cylinder body is arranged on one side of the main cylinder body, including the booster cylinder barrel and the rear locking block; the oil storage cylinder body is arranged on one side of the booster cylinder body, including the oil storage cylinder barrel and an oil storage front cover and an oil storage rear cover arranged at both ends of the oil storage cylinder barrel, the oil storage front cover is connected with the rear middle cover, an oil-passing sleeve is arranged in the oil storage cylinder barrel, and the oil-passing sleeve is installed on the oil storage front cover. The utility model has a compact and reasonable structure, few machine installation restrictions, and high applicability; it can reduce the hydraulic oil return flow rate, avoid hydraulic oil atomization, reduce hydraulic oil loss, and prevent oil spray, making the booster cylinder safe and reliable.

[0005] In the above technical solution, an oil-passing sleeve is provided in the oil storage cylinder, and the oil-passing sleeve is installed on the oil storage front cover, thereby reducing the flow rate of the hydraulic oil return, avoiding the atomization of the hydraulic oil, reducing the loss of hydraulic oil, and preventing the hydraulic oil from spraying out of the oil storage cylinder, making the booster cylinder safe and reliable.

[0006] In order to solve one of the above problems, the present application provides an oil filling structure for reducing the ingress of air into the boost cylinder. Utility Model Content

[0007] The purpose of the utility model is to solve the problems existing in the prior art, and to propose an oil filling structure for reducing the entry of air into the boost cylinder. The oil in the auxiliary oil tank is sucked into the cylinder barrel of the boost cylinder along a U-shaped tube through an oil filling valve. The oil suction method is to suck the oil from top to bottom, thereby reducing the entry of air into the cylinder barrel and better maintaining the high-pressure clamping force.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an oil filling structure for reducing the entry of air into the boost cylinder, comprising an auxiliary oil tank, the auxiliary oil tank is connected to the boost cylinder for oil supply, a mounting plate is provided on the boost cylinder, both ends of the mounting plate are respectively fixed to the auxiliary oil tank and the cylinder barrel of the boost cylinder, the auxiliary oil tank is located above the boost cylinder, the mounting plate seals one end of the cylinder barrel, a through hole connected to the cylinder barrel is processed in the mounting plate, an oil filling valve is installed on the mounting plate, both ends of the oil filling valve are respectively connected to the through hole and a U-shaped pipe, the U-shaped pipe is connected to the auxiliary oil tank, so that when the boost cylinder is working, the oil filling valve can suck oil from the auxiliary oil tank through the U-shaped, and a breathing valve is provided on the auxiliary oil tank to balance the air pressure in the auxiliary oil tank.

[0009] Furthermore, the auxiliary fuel tank as described above is fixed above the mounting plate via a support plate, and the support plate is located at the bottom of the auxiliary fuel tank and is fixed to the mounting plate via screws.

[0010] Furthermore, as described above, the axial direction of the through hole in the mounting plate and the axial direction of the cylinder barrel of the booster cylinder are perpendicular to each other, the through hole is processed from one side of the mounting plate to the joint between the cylinder barrel and the mounting plate, and a plug matching the size of the end of the through hole is fixed on the mounting plate.

[0011] Furthermore, one end of the U-shaped tube as described above is connected to the oil filling valve through a first flange, and the other end of the U-shaped tube is fixed in the black rubber tube through an annular throat clamp.

[0012] Furthermore, the other end of the black rubber tube as described above is also connected to the second flange through an annular throat clamp, and the second flange is connected to the bottom of the auxiliary oil tank. Screw holes are processed on the outer annular plates of the first flange and the second flange.

[0013] Furthermore, a sealing ring, such as an O-ring, is provided between the oil filling valve and the mounting plate as described above.

[0014] Furthermore, the bottom of the auxiliary oil tank as described above is provided with a discharge valve, and the side of the auxiliary oil tank is provided with an oil hole.

[0015] Furthermore, as described above, a piston rod is movably provided in the cylinder, the piston rod includes an integrated piston and a rod portion, the diameter of the piston is larger than the outer diameter of the rod portion, a blind hole is machined in the piston rod, a fixed rod is movably provided in the blind hole, the fixed rod is fixed to the mounting plate, and the piston rod moves linearly along the axial direction of the blind hole.

[0016] Furthermore, a through hole is machined in the fixing rod as described above, which connects the blind hole in the piston rod and the oil nozzle at the end of the fixing rod, and is used to inject oil into the blind hole to push the piston rod forward in the axial direction of the blind hole or to discharge oil from the blind hole to make the piston rod retreat.

[0017] Furthermore, a wear-resistant ring is sleeved in the blind hole of the piston rod as described above, and a plurality of sealing rings are arranged between the wear-resistant ring and the fixed rod. The fixed rod is clamped on the mounting plate through a step position and is screwed and fixed by a locking block.

[0018] Compared with the prior art, the beneficial effect of the utility model is that the oil filling valve of the device sucks the oil into the cylinder barrel of the booster cylinder along the U-shaped tube through the upper back auxiliary oil tank, and the oil suction method is changed to sucking oil from top to bottom, which reduces the self-priming efficiency requirement of the oil filling valve, ensures that there is no risk of air suction in the pipeline, and better maintains the high-pressure clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the utility model;

[0020] Figure 2 It is a three-dimensional diagram of the utility model;

[0021] Figure 3 It is an explosion diagram of the utility model;

[0022] Figure 4 It is a top view of the utility model;

[0023] Figure 5 for Figure 4 Section view in the AA direction;

[0024] Figure 6 for Figure 5 Enlarged view of the middle boost cylinder.

[0025] In the figure: 1. mounting plate; 11. through hole; 12. plug; 2. auxiliary oil tank; 21. second flange; 3. oil filling valve; 4. black rubber tube; 5. U-shaped tube; 51. first flange; 6. breathing valve; 7. sealing ring; 8. annular throat clamp; 9. booster cylinder; 91. fixing rod; 92. locking block; 93. wear-resistant ring; 94. piston rod; 95. cylinder barrel. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected", "set", etc. should be understood in a broad sense. For example, when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be a central element. When an element is considered to be "installed on" another element, it can be directly installed on the other element or there can be a central element. When an element is considered to be "connected" to another element, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a communication between the two elements.

[0028] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Embodiment 1

[0031] Reference Figure 1-6As shown, the utility model is an oil filling structure for reducing the air entering the boost cylinder, comprising an auxiliary oil tank 2, the auxiliary oil tank 2 is connected to the boost cylinder 9 to assist in supplying oil thereto, the boost cylinder 9 is provided with a mounting plate 1, the two ends of the mounting plate 1 are respectively fixed to the auxiliary oil tank 2 and the cylinder barrel 95 of the boost cylinder 9, specifically, the mounting plate 1 is provided with an upper back type auxiliary oil tank 2 exclusively for the boost cylinder 9, at the same time, the mounting plate 1 is connected to the cylinder barrel 95 to play the role of a locking block 92, a through hole 11 connected to the cylinder barrel 95 is processed in the mounting plate 1, an oil filling valve 3 is installed on the mounting plate 1, and the oil filling valve 3 The two ends are respectively connected to the through hole 11 and the U-shaped tube 5, and the U-shaped tube 5 is connected to the auxiliary oil tank 2. In this way, the oil in the auxiliary oil tank 2 can enter the cylinder 95 through the U-shaped tube 5 and the oil filling valve 3. The installation position of the U-shaped tube 5 is below the auxiliary oil tank 2. This design prevents the inflation in the auxiliary oil tank 2 from entering the U-shaped tube 5, and also does not enter the cylinder 95, so that the high-pressure clamping force can be better maintained. A breathing valve 6 is provided on the auxiliary oil tank 2. The breathing valve 6 is a conventional component that can be directly purchased on the market. Its specific structural design is not repeated here. The breathing valve 6 (BREATHING VALVE) is used for the air pressure balance in the auxiliary oil tank 2. It is a safe and energy-saving product that reduces the volatilization of the oil medium. Its principle is to use the weight of the positive and negative pressure valve disc to control the exhaust positive pressure and the suction negative pressure of the auxiliary oil tank 2, to ensure that the pressure in the auxiliary oil tank 2 does not continue to drop or rise, so that the air pressure inside and outside the auxiliary oil tank 2 is balanced, which is a safety device for protecting the auxiliary oil tank 2.

[0032] The working principle of the oil filling valve 3 is that when the upper chamber of the cylinder barrel 95 of the booster cylinder 9 is in a vacuum state, the valve port of the oil filling valve 3 is sucked open, and the oil in the auxiliary oil tank 2 is put into the upper chamber of the cylinder barrel 95. Then the oil filling valve 3 is closed and operates under the oil supply pressure of the oil pump; on the contrary, the piston reverse stroke oil pump supplies oil to the lower chamber of the cylinder barrel 95. When the piston has not moved, the lower chamber has pressure. A small tube is used to lead this pressure to the oil filling valve 3 to open the oil filling valve 3. When the piston rises, the oil in the upper chamber of the cylinder barrel 95 returns to the auxiliary oil tank 2. The oil filling valve 3 is a conventional component that can be directly purchased on the market, and its specific structural design is not described here.

[0033] Embodiment 2

[0034] Reference Figure 1-6 As shown, based on the technical solution of embodiment 1, an oil filling structure for reducing the air entering the boost cylinder is provided. The auxiliary oil tank 2 is fixed above the mounting plate 1 through a support plate. Figure 1 and Figure 2It can be seen that the support plate is an L-shaped plate, which is welded to the lower part of the auxiliary oil tank 2 and drilled with holes and screwed to the upper part of the mounting plate 1, so that the bottom position of the auxiliary oil tank 2 is higher than the top of the cylinder 95, and the medium oil in the auxiliary oil tank 2 will not enter the air due to its own gravity in the U-shaped tube 5. In addition, the auxiliary oil tank 2 is composed of a cover plate, a side plate and a bottom plate, wherein a breathing valve 6 is arranged on the cover plate, and the four side plates are surrounded and respectively connected with the cover plate and the bottom plate to form a box structure, and a discharge valve is arranged at the bottom of the auxiliary oil tank 2 for emptying the auxiliary oil tank 2, and an oil hole is arranged on the side of the auxiliary oil tank 2, which can be used to connect other oil storage tanks according to actual needs.

[0035] Furthermore, the axial direction of the through hole 11 in the mounting plate 1 and the axial direction of the cylinder barrel 95 of the booster cylinder 9 are perpendicular to each other. Since the through hole 11 is drilled from the side of the mounting plate 1 to the joint of the cylinder barrel 95 and the mounting plate 1, a plug 12 matching the size of the end of the through hole 11 needs to be fixed on the mounting plate 1, and a sealing element such as an O-ring is provided between the plug 12 and the mounting plate 1. In addition, a mounting hole is processed below the mounting plate 1, and the mounting hole is connected to the through hole 11, which is used for the installation and fixation of the oil filling valve 3. A sealing ring 7 is provided between the oil filling valve 3 and the mounting plate 1, and the sealing ring 7 is an O-ring.

[0036] Furthermore, one end of the U-shaped tube 5 is connected to the oil filling valve 3 through the first flange 51, and the other end of the U-shaped tube 5 is fixed in the black rubber tube 4 through an annular throat hoop 8. The other end of the black rubber tube 4 is also connected to the second flange 21 through an annular throat hoop 8, and the second flange 21 is connected to the bottom of the auxiliary oil tank 2. The U-shaped tube 5 is generally a steel pipe or a steel wire braided pipe, and the black rubber tube 4 is made of plastic or rubber, which plays a role of a flexible connection when there is a certain deviation in the installation position of the auxiliary oil tank 2.

[0037] Embodiment 3

[0038] Reference Figure 1-6As shown, based on the technical solution of the second embodiment, an oil filling structure for reducing the air entering the boost cylinder is provided. For the specific structural design of the boost cylinder 9, a piston rod 94 is movably provided in the cylinder barrel 95, and the piston rod 94 includes an integrated piston and a rod portion, and the outer diameter of the piston is larger than the diameter of the rod portion. A blind hole is processed in the piston rod 94, and a fixed rod 91 is movably provided in the blind hole. The fixed rod 91 is fixed to the mounting plate 1, and the piston rod 94 moves linearly along the axial direction of the blind hole. The mounting plate 1, the fixed rod 91, the piston end, and the inside of the cylinder barrel 95 constitute the upper chamber of the cylinder barrel 95, and the upper chamber is connected to the through hole 11. Specifically, a through hole is processed in the fixed rod 91, and the through hole connects the blind hole in the piston rod 94 and the oil nozzle at the end of the fixed rod 91. The oil nozzle at the end of the fixed rod 91 connects the external oil pipe, the oil pump, and the oil storage tank, and is used to inject oil into the blind hole to push the piston rod 94 forward along the axial direction of the blind hole or to discharge oil from the blind hole to make the piston rod 94 retreat.

[0039] Further, a wear ring 93 is sleeved in the blind hole of the piston rod 94 as described above, and a plurality of sealing rings are arranged between the wear ring 93 and the fixed rod 91. Specifically, the wear ring 93 is a step ring sleeved between the piston and the fixed rod 91, and the fixed rod 91 is clamped on the mounting plate 1 through the step position and is screwed and fixed by the locking block 92, as shown in FIG. Figure 6 As shown, a locking block 92 is threadedly connected to the end of the fixing rod 91 , and a sealing component, such as an O-ring, is also provided between the fixing rod 91 and the mounting plate 1 .

[0040] In addition, a flange plate is provided at one end of the cylinder 95. Figure 6 Omitted and not drawn, the flange plate and the mounting plate 1 are fastened to the cylinder 95 by a number of screws, both ends of the screws are respectively machined with external threads, the parts of the screws that pass through the mounting plate 1 and the flange plate are locked and fixed by external threaded connecting nuts, wherein an end cover is clamped in the flange plate, and the end cover is clamped in the cylinder 95 through a step position design and movably mounted on the rod portion of the piston rod 94, the lower chamber of the cylinder 95 is formed between the end cover, the inner wall of the cylinder 95 and the piston and the rod portion, and an oil nozzle is machined outside the cylinder 95, which is used to connect a small tube to the oil filling valve 3 to open the oil filling valve 3.

[0041] Working principle: The existing oil suction structure of the boost cylinder 9 is partially changed, and the oil suction method from bottom to top is changed to top to bottom. The design combining the structure of the U-tube 5 and the installation position of the auxiliary oil tank 2 is used to reduce the entry of outside air into the cylinder barrel 95 of the boost cylinder 9, making it easier to maintain the high-pressure clamping force of the boost cylinder 9 and making the production cycle more stable.

[0042] In the device of the utility model, the assembly and matching relationship of the various components involved, the annular throat clamp 8, the breathing valve 6, the oil filling valve 3, the oil pump and its control software, etc. are existing technologies or materials. The relevant technical personnel can directly purchase or customize them from the market according to the required product models and specifications.

[0043] The electrical components mentioned in the text are all connected to an external main controller and 220V mains or industrial electricity, and the main controller can be a conventional known device such as a computer that plays a control role.

[0044] The above is only a preferred specific embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described too much here. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned embodiment, and the utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiment should be regarded as exemplary and non-restrictive. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical scheme of the utility model and its utility model concept, shall be covered within the protection scope of the utility model.

Claims

1. An oil filling structure for reducing air ingress into a boost cylinder, comprising an auxiliary oil tank (2), wherein the auxiliary oil tank (2) is connected to the boost cylinder (9), and is characterized in that: The boost cylinder (9) is provided with a mounting plate (1), the two ends of the mounting plate (1) are respectively fixed to the auxiliary oil tank (2) and the cylinder barrel (95) of the boost cylinder (9), a through hole (11) connected to the cylinder barrel (95) is processed in the mounting plate (1), an oil filling valve (3) is installed on the mounting plate (1), the two ends of the oil filling valve (3) are respectively connected to the through hole (11) and the U-shaped pipe (5), the U-shaped pipe (5) is connected to the auxiliary oil tank (2), and the auxiliary oil tank (2) is provided with a breathing valve (6).

2. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 1, characterized in that: The auxiliary oil tank (2) is fixed above the mounting plate (1) via a support plate.

3. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 2, characterized in that: The axial direction of the through hole (11) in the mounting plate (1) and the axial direction of the cylinder barrel (95) of the booster cylinder (9) are perpendicular to each other, and a plug (12) matching the size of the end of the through hole (11) is fixed on the mounting plate (1).

4. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 3, characterized in that: One end of the U-shaped tube (5) is connected to the oil filling valve (3) via a first flange (51), and the other end of the U-shaped tube (5) is fixed in the black rubber tube (4) via an annular throat hoop (8).

5. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 4, characterized in that: The other end of the black rubber tube (4) is also connected to the second flange (21) through an annular throat hoop (8), and the second flange (21) is connected to the bottom of the auxiliary oil tank (2).

6. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 5, characterized in that: A sealing ring (7) is provided between the oil filling valve (3) and the mounting plate (1).

7. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 6, characterized in that: The bottom of the auxiliary oil tank (2) is provided with a discharge valve, and the side of the auxiliary oil tank (2) is provided with an oil hole.

8. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 7, characterized in that: A piston rod (94) is movably arranged in the cylinder barrel (95), a blind hole is processed in the piston rod (94), a fixing rod (91) is movably arranged in the blind hole, and the fixing rod (91) is fixed to the mounting plate (1).

9. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 8, characterized in that: A through hole is machined in the fixing rod (91), and the through hole communicates with the blind hole in the piston rod (94) and the oil nozzle at the end of the fixing rod (91).

10. The oil filling structure for reducing air ingress into a supercharged cylinder according to claim 9, characterized in that: A wear-resistant ring (93) is sleeved in the blind hole of the piston rod (94), and a plurality of sealing rings are arranged between the wear-resistant ring (93) and the fixed rod (91). The fixed rod (91) is clamped on the mounting plate (1) through a step position and is screwed and fixed through a locking block (92).

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