Double cylinder hydraulic press

Abstract

The utility model discloses a double -cylinder ejection hydraulic press, aims at solving the problem of the uneven stripping force of the existing technology that different step of many hydraulic cylinders leads to product easy deformation. The hydraulic press includes frame, forming subassembly and ejection system. The ejection system sets up at the bottom of base, and its core lies in by the first ejector and the second ejector integrated constitutes a whole ejection power module, and the first ejector is connected through a plurality of ejector rods and drives the core, and the second ejector is connected through a plurality of pull rods and drives the mould frame. By controlling the motion direction of the output end of two ejectors opposite, respectively drive the core and the mould frame to carry out opposite ejection and shrinkage movement, thereby realizing two -way compression in the compression stage to guarantee the uniformity of the blank density, realizes the synchronous pullback of the mould frame in the stripping stage to eliminate the stripping partial load. The utility model discloses compact structure, control is simple, can obviously promote the size precision and quality consistency of product.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic press technology, specifically to a double-cylinder ejector hydraulic press. Background Technology

[0002] Hydraulic forming machines are used for high-pressure forming of materials such as powders, ceramics, and metal powders. A typical structure includes an upper pressure head, a lower pressure head, a floating beam / mold frame, several hydraulic cylinders (such as four symmetrically arranged hydraulic cylinders), guide components, an ejection mechanism, and corresponding hydraulic valve circuits and control systems. The forming process generally involves powder loading—mold frame closure—pressure forming—backpressure—demolding and ejection. To ensure uniform force distribution on the mold frame and reduce the impact of friction, production equipment often employs a floating beam or multi-point support structure, with multiple hydraulic cylinders working together to drive the mold frame lifting and ejection.

[0003] In actual production, due to factors such as manufacturing tolerances of hydraulic cylinders, differences in oil circuit impedance, poor valve response, inconsistent cylinder guiding and sealing friction, and inadequate adjustment of pipeline length, flow distribution, and control components, it is difficult for multiple hydraulic cylinders (such as four hydraulic cylinders on a floating beam) to operate in perfect synchronization. If the ejection cylinders are not synchronized or the force distribution is uneven during the ejection stage, it will cause localized uneven stress on the mold frame, bending deformation of the blank, or local density differences, thereby affecting the consistency of the product and the forming yield. Utility Model Content

[0004] The purpose of this invention is to provide a double-cylinder ejection hydraulic press, which aims to solve the problem in the prior art where the four hydraulic cylinders on the floating beam do not move synchronously, resulting in uneven distribution of demolding force, blank deformation, and reduced product quality.

[0005] To achieve the above objectives, this utility model provides a double-cylinder ejection hydraulic press, comprising: a frame, including a base and an upper cylinder mounted above the base via multiple columns; a forming assembly, including a movable crossbeam and an upper mold mounted on the piston rod end of the upper cylinder, and a lower mold mounted on the base, wherein the mold frame and mold core of the lower mold are movable relative to each other; and an ejection system, disposed at the bottom of the base, comprising: a mounting frame, fixedly connected to the bottom of the base; a first ejector and a second ejector, both integrated on the mounting frame and forming an integral ejection power module; a first transmission assembly, passing through the mounting frame and connected between the output end of the first ejector and the mold core; and a second transmission assembly, passing through the mounting frame and connected between the output end of the second ejector and the mold frame; the output ends of the first and second ejectors move in opposite directions, thereby driving the mold core and mold frame to perform opposite ejection and retraction movements respectively via the first and second transmission assemblies.

[0006] Furthermore, the mounting frame includes: a connecting plate, fixedly connected to the bottom of the base; an ejector plate, spaced vertically from the connecting plate; and a first ejector and a second ejector stacked between the connecting plate and the ejector plate.

[0007] Furthermore, the output end of the first ejector is arranged facing upward and connected to an output plate. The first transmission component consists of multiple ejector rods, which are arranged on the output plate and pass through the connecting plate and the base in sequence before being connected to the mold core drive.

[0008] Furthermore, a fixed connecting plate is provided between the fixed end of the first ejector and the fixed end of the second ejector. The mounting frame also includes multiple fixing rods, one end of which is connected to the fixed connecting plate, and the other end passes through the output plate and is fixedly connected to the connecting plate.

[0009] Furthermore, both the fixed connecting plate and the output plate are disc-shaped, and the number of the multiple fixing rods is four, which are evenly distributed around the first ejector and the second ejector in the circumference.

[0010] Furthermore, the output end of the second ejector is arranged downward and fixedly connected to the ejector plate. The second transmission component consists of multiple tie rods, which are arranged on the ejector plate and sequentially pass through the connecting plate and the base before being driven and connected to the mold frame.

[0011] Furthermore, the multiple columns, top rods, and tie rods are all arranged symmetrically in pairs.

[0012] Furthermore, the movable crossbeam slides in conjunction with the column via guide sleeves on both sides.

[0013] Furthermore, the first ejector and / or the second ejector is a hydraulic cylinder, a pneumatic cylinder, or an electric push rod.

[0014] Furthermore, both the first ejector and the second ejector are hydraulic cylinders.

[0015] The dual-cylinder ejection hydraulic press provided by this utility model, compared with the prior art, independently and synchronously controls the ejection movement of the mold core and the retraction movement of the mold frame by integrating the power modules of the first ejector and the second ejector. This enables bidirectional pressing of the mold core upward and the upper mold during the pressure forming stage, ensuring uniform density of the blank. During the demolding stage, the mold frame is synchronously and uniformly pulled downward to demold, eliminating defects such as uneven load, product bending or cracking caused by asynchronous ejection cylinders, and significantly improving the dimensional accuracy and quality consistency of the product. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of a double-cylinder ejector hydraulic press according to the present invention; Figure 2 This is a schematic diagram of the connection structure between the ejection system and the lower mold in a double-cylinder ejection hydraulic press according to the present invention; Figure 3 This is a schematic diagram of the cross-sectional connection structure between the ejection system and the lower mold in a double-cylinder ejection hydraulic press according to this utility model.

[0017] Explanation of reference numerals in the attached figures 1-Rack; 10-Base; 11-Column; 12-Upper hydraulic cylinder; 20 - Moving crossbeam; 21 - Upper mold; 30 - Lower mold; 31 - Mold core; 311 - Mold core fixing seat; 32 - Mold frame; 321 - Mold frame mounting plate; 40 - Ejection system; 41 - Mounting frame; 411 - Connecting plate; 412 - Ejection plate; 42 - First ejector; 421 - Output plate; 43 - Second ejector; 431 - Fixed connecting plate; 432 - Fixed rod; 44 - First transmission assembly; 45 - Second transmission assembly. Detailed Implementation

[0018] The present invention will be described in detail below with reference to specific embodiments.

[0019] In this utility model, when directional terms appear, they are used to facilitate the description of this utility model and simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this utility model.

[0020] In this utility model, unless otherwise explicitly specified and limited, when terms such as "set in," "connected," or "linked" appear, these terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Figures 1 to 3 As shown, this embodiment provides a dual-cylinder ejection hydraulic press, including a frame 1, a forming assembly, and an ejection system 40.

[0022] The frame 1 consists of a base 10, four columns 11, and an upper hydraulic cylinder 12. The lower ends of the four columns 11 are fixedly connected to the base 10 and arranged symmetrically in pairs. The cylinder bodies of the upper hydraulic cylinder 12 are directly fixed to the tops of the four columns 11 via flanges or bolts, so that the columns 11 simultaneously serve the dual function of supporting the upper hydraulic cylinder 12 and acting as guide columns, eliminating the need for the traditional upper crossbeam structure and simplifying the frame 1.

[0023] The forming assembly includes a movable crossbeam 20, an upper mold 21, and a lower mold 30. Guide sleeves are provided at the four corners of the movable crossbeam 20, and these guide sleeves slide in engagement with four columns 11, providing precise guiding connections for accurate alignment of the upper mold 21 and the lower mold 30. The piston rod of the upper hydraulic cylinder 12 extends downwards and is fixedly connected to the top center of the movable crossbeam 20. The upper mold 21 is bolted to the bottom of the movable crossbeam 20.

[0024] The lower mold 30 is mounted on the base 10. Specifically, the lower mold 30 includes a mold core 31 and a mold frame 32 fitted over the mold core 31. The bottom of the mold core 31 is fixedly mounted on a mold core fixing seat 311, serving as a mounting and force-transmitting base. The bottom of the mold frame 32 is fixedly mounted on a mold frame mounting plate 321. The mold frame mounting plate 321 and the mold frame 32 are fitted together over the mold core 31 and the mold core fixing seat 311, and can move up and down relative to them. This structure establishes a precise guiding and sliding fit between the mold frame 32 and the mold core 31, forming the basis for achieving precise relative movement between them (i.e., demolding action), thus avoiding the need for additional complex guiding mechanisms.

[0025] The ejection system 40 is located at the bottom of the base 10 and includes a mounting frame 41, a first ejector 42, a second ejector 43, a first transmission assembly 44, and a second transmission assembly 45.

[0026] The mounting frame 41 includes a connecting plate 411 fixedly connected to the bottom of the base 10, and an ejector plate 412 spaced vertically from the connecting plate 411. A first ejector 42 and a second ejector 43 are stacked between the connecting plate 411 and the ejector plate 412, forming an integrated ejection power module. In a preferred embodiment of this invention, both the first ejector 42 and the second ejector 43 are hydraulic cylinders.

[0027] The first ejector 42 and the second ejector 43 are integrated and stacked between the connecting plate 411 and the ejector plate 412, forming a compact and integrated ejection power module. The output end of the first ejector 42 is arranged upward and connected to a disc-shaped output plate 421, while the output end of the second ejector 43 is arranged downward and fixedly connected to the ejector plate 412.

[0028] The first transmission assembly 44 consists of multiple ejector rods. The lower end of each ejector rod is fixedly connected to the output plate 421, and the upper end passes through corresponding through holes pre-drilled in the connecting plate 411 and the base 10, finally being fixedly connected to the bottom of the mold core fixing seat 311. Therefore, the action of the first ejector 42 is directly and without offset transmitted to the mold core fixing seat 311 through the ejector rods, thereby driving the mold core 31 to perform precise ejection and retraction movements, and cooperating with the upper mold to achieve bidirectional pressing during the pressing stage.

[0029] The second transmission assembly 45 consists of multiple tie rods. The lower ends of the tie rods are fixedly connected to the ejector plate 412, and the upper ends pass through corresponding through holes reserved in the connecting plate 411 and the base 10 in sequence, and finally are fixedly connected to the bottom of the mold frame mounting plate 321. The multiple tie rods not only transmit power, but also form a guide and support for the mold frame mounting plate 321, so that the second ejector 43 can drive the mold frame mounting plate 321 and the mold frame 32 to rise and fall synchronously and smoothly through the tie rods.

[0030] In this embodiment, the multiple columns 11, top rods, and tie rods are arranged symmetrically in pairs to ensure that the equipment is subjected to balanced forces during operation and to avoid generating harmful eccentric load moments.

[0031] In this embodiment, a disc-shaped fixed connecting plate 431 is provided between the fixed end of the first ejector 42 and the fixed end of the second ejector 43. The plate is fastened to the two with bolts, so that the first ejector 42 and the second ejector 43 are connected back to back into one.

[0032] The mounting frame 41 also includes four fixing rods 432, which are evenly distributed around the circumference of the first ejector 42 and the second ejector 43. The lower end of the fixing rod 432 is connected to the fixing connecting plate 431, and its upper end passes through the pre-reserved through holes on the output plate 421, and is finally fixedly connected to the upper connecting plate 411. This connection structure rigidly connects the cylinders of the first ejector 42 and the second ejector 43, the output plate 421, and the connecting plate 411 into a robust frame structure. This greatly suppresses the deformation and vibration of the entire ejection power module under high pressure, ensuring that the force output by the ejector rod and the pull rod is more precise and stable, which is the core guarantee for achieving high-precision synchronous motion.

[0033] The specific working principle of this utility model is as follows: Powder loading stage: The first ejector 42 ejects upward, pushing the mold core 31 upward through the ejector rod. The mold core 31 protrudes from the mold frame 32, forming a mold cavity with the powder loading depth, and then the powder is loaded.

[0034] Mold closing and bidirectional pressing: The upper hydraulic cylinder 12 drives the upper mold 21 to move downward. At the same time, the first ejector 42 maintains an upward ejection force. After the upper mold 21 contacts the mold frame 32, it moves downward together and achieves bidirectional counter-pressing with the upward ejected mold core 31 to ensure uniform blank density.

[0035] Demolding: The upper mold 21 returns upward, and the second ejector 43 ejects downward. The mold frame 32 is pulled downward synchronously and evenly by the tie rod, and the mold frame 32 separates from the stationary blank, completing the demolding. There is no off-center load in this process.

[0036] Ejection: The first ejector 42 ejects upward again, and the mold core 31 and the finished blank are ejected from the upper surface of the mold frame 32 through the ejector rod, so as to remove the part.

[0037] Reset: The first ejector 42 retracts, causing the mold core 31 to descend and reset. The second ejector 43 retracts, and the mold frame 32 returns to its initial position under the action of the reset device.

[0038] In summary, this utility model integrates the two ejectors of the drive mold core 31 and the mold frame 32 into a rigid mounting frame 41 to form a unified power module. With an extremely simple and reliable structure, it independently and precisely controls the two core process steps of bidirectional pressing and synchronous demolding, solving a series of product quality problems caused by the asynchrony of multiple hydraulic cylinders in the prior art.

[0039] Where there is no conflict, the above embodiments and features can be combined with each other.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A double-cylinder ejection hydraulic press, characterized in that, include: The frame includes a base and an upper hydraulic cylinder mounted above the base via multiple columns; The forming assembly includes a movable crossbeam and an upper mold disposed at the piston rod end of the upper cylinder, and a lower mold disposed on the base, wherein the mold frame and the mold core of the lower mold can move relative to each other; An ejection system, disposed at the bottom of the base, the ejection system comprising: The mounting frame is fixedly connected to the bottom of the base; The first ejector and the second ejector are integrated on the mounting frame and form an integral ejection power module. The first transmission component is mounted on the mounting frame and connected between the output end of the first ejector and the mold core. The second transmission component is mounted on the mounting frame and connected between the output end of the second ejector and the mold frame; The output ends of the first ejector and the second ejector move in opposite directions, so as to drive the mold core and the mold frame to perform opposite ejection and retraction movements through the first transmission assembly and the second transmission assembly, respectively.

2. The double-cylinder ejection hydraulic press according to claim 1, characterized in that, The installation framework includes: A connecting plate is fixedly connected to the bottom of the base; The ejector plate is positioned vertically and vertically at intervals from the connecting plate; The first ejector and the second ejector are stacked between the connecting plate and the ejector plate.

3. The double-cylinder ejection hydraulic press according to claim 2, characterized in that, The first ejector has its output end facing upward and connected to an output plate. The first transmission assembly consists of multiple ejector rods, which are disposed on the output plate and pass through the connecting plate and the base in sequence before being connected to the mold core drive.

4. The double-cylinder ejection hydraulic press according to claim 3, characterized in that, A fixed connecting plate is provided between the fixed end of the first ejector and the fixed end of the second ejector. The mounting frame also includes multiple fixing rods, one end of which is connected to the fixed connecting plate, and the other end passes through the output plate and is fixedly connected to the connecting plate.

5. The double-cylinder ejection hydraulic press according to claim 4, characterized in that, Both the fixed connecting plate and the output plate are disc-shaped, and the number of the multiple fixing rods is four, which are evenly distributed around the first ejector and the second ejector.

6. The double-cylinder ejection hydraulic press according to claim 2, characterized in that, The output end of the second ejector is set downward and fixedly connected to the ejector plate. The second transmission component consists of multiple tie rods, which are set on the ejector plate and pass through the connecting plate and the base in sequence before being driven and connected to the mold frame.

7. The double-cylinder ejection hydraulic press according to claim 6, characterized in that, The multiple columns, top rods, and tie rods are all arranged symmetrically in pairs.

8. The double-cylinder ejection hydraulic press according to claim 1, characterized in that, The movable crossbeam slides into the column via guide sleeves on both sides.

9. The double-cylinder ejection hydraulic press according to claim 1, characterized in that, The first ejector and / or the second ejector is a hydraulic cylinder, a pneumatic cylinder, or an electric push rod.

10. The double-cylinder ejection hydraulic press according to claim 9, characterized in that, Both the first ejector and the second ejector are hydraulic cylinders.

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