Pressure equalizing bladder hydraulic press

Abstract

The application relates to the explosive pressing technical field and discloses a uniform-pressure skin bag hydraulic machine. The uniform-pressure skin bag hydraulic machine comprises a rack, a hydraulic system and a skin bag liquid-filling pressure increasing system, the lower surface of the rack is fixedly connected with a workbench base plate, the upper surface of the workbench base plate is fixedly connected with a mold, the skin bag liquid-filling pressure increasing system comprises a displacement sensor, a skin bag body, a rubber pad, an upper push rod and a punch, the inside of the rack is slidably connected with a sliding block, the sliding block is located below a main oil cylinder, the inside of the sliding block is provided with the displacement sensor, the side surface of the sliding block is provided with the rubber pad, the upper surface of the rubber pad is provided with the skin bag body, the upper surface of the skin bag body is provided with a skin bag oil inlet, the lower surface of the rubber pad is provided with the upper push rod, the end, away from the rubber, of the upper push rod is movably connected with the punch, the sliding block-embedded skin bag and the outer-wrapped rubber pad structure can reduce the stress of the skin bag and prolong the service life of the skin bag.

Description

Technical Field

[0001] This invention relates to the field of explosives compression technology, specifically to a pressure equalization bladder hydraulic press. Background Technology

[0002] In some explosives pressing fields, the pressing process requires high pressure, as overpressure can easily cause explosions and other risks. In some solid-state battery electrolyte pressing fields, a uniform thin layer of solid electrolyte is needed to maintain high contact between layers and achieve stable ion movement, which requires high pressure uniformity. Some porous materials require high pressure uniformity to ensure uniform pore distribution in the pressed product, thus possessing certain special physical or chemical properties. In some precision cold extrusion fields, the pressure accuracy of extrusion is required to be high. Small parts production in these fields often adopts a multi-part die-casting method to increase output, which places higher demands on the pressure uniformity of all pressed parts in the die. Traditional multi-part powder / cold extrusion hydraulic presses use a main cylinder to drive a slider to press workpieces uniformly, usually adopting a single main cylinder structure. During pressing, due to factors such as machine deformation, gaps, dimensional and positional tolerances, and inconsistent loading heights, there are often inconsistent pressures in parts in different die cavities, leading to safety risks and increased product defect rates.

[0003] Currently, the problem of equalizing pressure across multiple parts in a single mold is generally solved by using independent drives, but the actual results are far from ideal, and sometimes even unusable. Independent drives typically use independent hydraulic cylinders, with the number of mold cavities equal to the number of pressing cylinders. These processes often involve high-pressure or ultra-high-pressure hydraulic systems. The high-pressure seals of too many cylinders often have very low reliability, frequently leaking oil and causing contamination of the blanks or parts. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a pressure equalizing bladder hydraulic press, which features a slider-embedded rubber bladder structure. The upper punch is driven by the internal pressure of the rubber bladder to perform uniform pressing, improving the sealing performance and service life of the bladder. This solves the problem of low high-pressure sealing reliability of hydraulic cylinders, frequent oil leakage, and contamination of blanks or parts.

[0006] (II) Technical Solution

[0007] To solve the above technical problems, the present invention provides the following technical solution: a pressure equalizing bladder hydraulic press, comprising a frame, a hydraulic system and a bladder filling and pressurizing system, characterized in that: a worktable pad is fixedly connected to the lower surface of the frame, a mold is fixedly connected to the upper surface of the worktable pad, a mold locking and limiting device is fixedly connected to the upper surface of the worktable pad, and the mold locking and limiting device is located on both sides of the mold, and the mold locking and limiting device is fixedly connected to the frame;

[0008] The bladder filling and pressurization system includes a displacement sensor, a bladder body, a rubber pad, an upper push rod, and a punch. A slider is slidably connected inside the frame and is located below the main oil cylinder. A displacement sensor is installed inside the slider. A rubber pad is installed on the side surface of the slider. A bladder body is installed on the upper surface of the rubber pad. A bladder oil inlet is provided on the upper surface of the bladder body. An upper push rod is installed below the rubber pad. A punch is movably connected to the end of the upper push rod away from the rubber pad.

[0009] The hydraulic system includes a main cylinder, which is fixedly connected to the top of the frame, and the output end of the main cylinder is fixedly connected to the slider.

[0010] The main hydraulic cylinder drives the slider to move downwards, and the slider guide rail guides and limits the movement direction of the slider, so that the mold locking and limiting device locks up and down. The displacement sensor transmits the signal to the hydraulic system to control the filling and pressurization of the bladder. 80-100Mpa liquid pressure is injected into the bladder body through the oil inlet. The pressure is transmitted to the upper push rod through the bladder body and the rubber pad. The upper push rod drives the punch to move downwards to press the blank in the mold cavity.

[0011] Preferably, the frame is internally fixedly connected to a slider guide rail, and the slider guide rail is slidably connected to the slider.

[0012] Preferably, the mold contains a blank, which is located below the punch. A guide post is fixedly connected to the upper surface of the mold, and the guide post is connected to the punch through a connecting plate.

[0013] Preferably, an ejector cylinder is fixedly connected to the lower surface of the worktable pad, and an ejector rod is fixedly connected to the output end of the ejector cylinder, with the end of the ejector rod away from the ejector cylinder extending into the interior of the mold.

[0014] Compared with the prior art, the present invention provides a pressure equalizing bladder hydraulic press, which has the following beneficial effects:

[0015] 1. The slider-embedded bladder and the outer rubber pad structure reduce bladder stress and extend bladder life. The outer rubber pad cavity structure allows the punch and push rod to be guided without sealing, ensuring that the bottom surface of the bladder remains flat when it is supported externally, thus equalizing the pressure distribution. The bladder's inverted pressure block structure makes it easier to ensure high-pressure sealing, and the liquid inside the bladder will not shift under long-term high-pressure tension, improving reliability. It can realize pressure grading and stepless pressure boosting pressing processes, and has a wide range of process adaptability.

[0016] 2. The mold clamping limit device ensures the slider's mold closing position, while the bladder provides pressing pressure. This not only ensures the accuracy of the slider's position during mold closing but also guarantees the reasonableness of the bladder's stroke. The mold clamping limit device is adjustable and can accommodate different mold mounting heights.

[0017] 3. The upper push rod and the punch are detachably connected and installed, allowing for quick adaptation to new product specifications by changing the punch. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the mold opening state structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the mold-locking and pressing state structure of the present invention.

[0020] The components are: 1. Frame; 2. Worktable pad; 3. Main oil cylinder; 4. Oil inlet of the bladder; 5. Bladder body; 6. Rubber pad; 7. Slider; 8. Upper push rod; 9. Punch; 10. Slider guide rail; 11. Mold locking and limiting device; 12. Ejector rod; 13. Blank; 14. Guide pillar; 15. Mold. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-2A pressure equalizing bladder hydraulic press includes a frame 1, a hydraulic system, and a bladder filling and pressurizing system. The bladder filling and pressurizing system includes a displacement sensor, a bladder body 5, a rubber pad 6, an upper push rod 8, and a punch 9. A slider 7 is slidably connected inside the frame 1 and is located below the main cylinder 3. A displacement sensor is installed inside the slider 7. A rubber pad 6 is provided on the side surface of the slider 7, and the bladder body 5 is provided on the upper surface of the rubber pad 6. The bladder has an inverted pressing block structure, which makes it easier to ensure high-pressure sealing and prevents the liquid inside the bladder from shifting under long-term high-pressure tension, thus improving reliability. The upper surface of the bladder body 5 has a bladder oil inlet 4. An upper push rod 8 is provided below the rubber pad 6. The end of the upper push rod 8 away from the rubber pad 6 is movably connected to the punch 9. The punch 9 has a quick-change structure to ensure the compatibility of the punch 9 with the pressed product. During the pressing of the blank 13, the main cylinder drives the slider... Under mold-locking conditions, 80-100 MPa liquid pressure is injected into the interior of the bladder body 5 through the oil inlet 4. The pressure is transmitted to the upper push rod 8 through the bladder body 5 and the rubber gasket 6. The upper push rod 8 drives the punch 9 to move downward to press the blank 13 in the mold cavity. The liquid pressure inside the bladder body 5 is adjusted to match the pressing pressure of the workpiece. Since all the upper push rods 8 are driven by the bladder together, the pressure they receive is consistent. All punches 9 and upper push rods 8 only need to be guided and do not need to be sealed. The bladder body 5 is an integral seal, which reduces the sealing difficulty and greatly increases reliability. At the same time, the upper push rod 8 has a pressure-bearing area that is larger at the top and smaller at the bottom. It can increase the liquid pressure of the bladder several times and apply it to the blank. Under the premise of the pressing pressure required for the blank 13, the liquid pressure of the bladder is greatly reduced, which improves the service life of the bladder body 5. The main oil cylinder 3 moves with a large stroke, while the bladder moves with a small stroke during forming, which greatly improves efficiency.

[0023] The hydraulic system includes a main cylinder 3, which is fixedly connected to the top of the frame 1, and its output end is fixedly connected to the slider 7. A worktable pad 2 is fixedly connected to the lower surface of the frame 1, and a mold 15 is fixedly connected to the upper surface of the worktable pad 2. A mold locking and limiting device 11 is fixedly connected to the upper surface of the worktable pad 2, and the mold locking and limiting device 11 is located on both sides of the mold 15. The mold locking and limiting device 11 is fixedly connected to the frame 1. A slider guide rail 10 is fixedly connected inside the frame 1, and the slider guide rail 10 is slidably connected to the slider 7. A blank 13 is provided inside the mold 15, and the blank 13 is located below the punch 9. A guide post 14 is fixedly connected to the upper surface of the mold 15, and the guide post 14 is connected to the punch 9 through a connecting plate. An ejector cylinder is fixedly connected to the lower surface of the worktable pad 2. The output end of the cylinder is fixedly connected to the ejector rod 12, and the end of the ejector rod 12 away from the ejector cylinder extends into the interior of the mold 15. During the pressing of the blank 13, the main oil cylinder 3 drives the slider 7 to move downward. The slider guide rail 10 guides and limits the movement direction of the slider 7, so that the mold locking and limiting device 11 locks up and down. The displacement sensor transmits the signal to the hydraulic system to control the bladder to fill and pressurize for pressing. The mold locking and limiting ensures the mold closing position of the slider 7. The bladder provides the pressing pressure. Under the premise of ensuring the accuracy of the slider 7 position when the mold is closed, the bladder stroke is more reasonable. At the same time, when the punch 9 presses the blank 13 downward, the guide post 14 limits the punch 9. After pressing is completed, the ejector cylinder is driven to move the ejector rod 12 upward, and the pressed blank 13 is ejected and demolded.

[0024] In use, the main hydraulic cylinder 3 drives the slider 7 to move downwards, and the slider guide rail 10 guides and limits the movement direction of the slider 7, so that the mold locking limit device 11 locks up and down. The displacement sensor transmits the signal to the hydraulic system to control the filling and pressurization of the bladder. 80-100Mpa liquid pressure is injected into the inside of the bladder body 5 through the bladder oil inlet 4. The pressure is transmitted to the upper push rod 8 through the bladder body 5 and the rubber pad 6. The upper push rod 8 drives the punch 9 to move downwards to press the blank 13 in the mold cavity. The ejector cylinder drives the ejector rod 12 to move upwards to eject the pressed blank 13 out of the mold.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure equalizing bladder hydraulic press, comprising a frame (1), a hydraulic system, and a bladder filling and pressurizing system, characterized in that: The lower surface of the frame (1) is fixedly connected to a worktable pad (2), the upper surface of the worktable pad (2) is fixedly connected to a mold (15), the upper surface of the worktable pad (2) is fixedly connected to a mold locking device (11), and the mold locking device (11) is located on both sides of the mold (15). The mold locking device (11) is fixedly connected to the frame (1). The bladder filling and pressurization system includes a displacement sensor, a bladder body (5), a rubber pad (6), an upper push rod (8), and a punch (9). A slider (7) is slidably connected inside the frame (1), and the slider (7) is located below the main oil cylinder (3). A displacement sensor is installed inside the slider (7). A rubber pad (6) is installed on the side surface of the slider (7). A bladder body (5) is installed on the upper surface of the rubber pad (6). A bladder oil inlet (4) is provided on the upper surface of the bladder body (5). An upper push rod (8) is installed below the rubber pad (6). A punch (9) is movably connected to the end of the upper push rod (8) away from the rubber pad (6). The hydraulic system includes a main cylinder (3), which is fixedly connected to the top of the frame (1), and the output end of the main cylinder (3) is fixedly connected to the slider (7); The main cylinder (3) drives the slider (7) to move downward. The slider guide rail (10) guides and limits the movement direction of the slider (7), so that the mold locking device (11) locks up and down. The displacement sensor transmits the signal to the hydraulic system to control the bladder to fill and pressurize. 80-100Mpa liquid pressure is injected into the bladder body (5) through the bladder inlet (4). The pressure is transmitted to the upper push rod (8) through the bladder body (5) and the rubber pad (6). The upper push rod (8) drives the punch (9) to move downward to press the blank (13) in the mold cavity.

2. The pressure equalizing bladder hydraulic press according to claim 1, characterized in that: The frame (1) is internally fixedly connected to a slider guide rail (10), and the slider guide rail (10) is slidably connected to the slider (7).

3. The pressure equalizing bladder hydraulic press according to claim 1, characterized in that: The mold (15) has a blank (13) inside, and the blank (13) is located below the punch (9). The upper surface of the mold (15) is fixedly connected to a guide post (14), and the guide post (14) is connected to the punch (9) through a connecting plate.

4. The pressure equalizing bladder hydraulic press according to claim 1, characterized in that: The lower surface of the worktable pad (2) is fixedly connected to an ejector cylinder, and the output end of the ejector cylinder is fixedly connected to an ejector rod (12), with the end of the ejector rod (12) away from the ejector cylinder extending into the interior of the mold (15).

Images