Balance cylinder of press machine

Abstract

The embodiment of the invention provides a balance cylinder of a press machine. The balance cylinder comprises a cylinder body, a piston assembly and a cover plate. The cylinder body is provided with a containing cavity, a first opening and a second opening, wherein the first opening and the second opening communicate with the containing cavity and are formed in the two opposite ends of the containing cavity in the first direction. The piston assembly comprises a piston head and a piston rod, the piston head is slidably arranged in the containing cavity, and the piston head is in sealing fit with the cavity wall of the containing cavity; one end of the piston rod is connected to the piston head, and the other end extends out of the containing cavity through the second opening and is in sealing fit with the second opening. The cover plate is arranged at the first opening, and the projection of the cover plate at least covers the gap between the piston head and the cavity wall of the containing cavity on a projection plane perpendicular to the first direction. According to the balance cylinder of the press machine, the cover plate plays a role in shielding the gap between the piston head and the cavity wall of the containing cavity in the first direction, the leakage risk of lubricating oil is reduced, and repeated utilization of the lubricating oil is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of presses, and particularly to a balance cylinder of a press. Background Art

[0002] As an important part of a stamping production line, a balance cylinder is an important component of a mechanical press. Its main function is to balance the weights of the slider, the slider piping, and some transmission components. When the mechanical press is working normally, the piston assembly of the balance cylinder moves up and down reciprocally, and the medium inside it is compressed air. The cavity wall of the cylinder body of the balance cylinder is lubricated with lubricating oil. In related technologies, the piston head of the piston assembly is matched with the cavity wall through a seal. During the movement of the piston head, the seal is likely to be damaged, resulting in the leakage of high-pressure gas, and the lubricating oil on the cavity wall of the cylinder body is blown out to the outside of the cylinder body, causing environmental pollution problems. Summary of the Invention

[0003] The present invention hopes to provide a balance cylinder of a press, which reduces the risk of lubricating oil leakage and improves the problem of environmental pollution of the balance cylinder.

[0004] In view of this, an embodiment of the present application provides a balance cylinder of a press, including:

[0005] A cylinder body, which is provided with a receiving cavity, a first opening and a second opening both communicating with the receiving cavity. The first opening and the second opening are arranged at opposite ends of the receiving cavity along a first direction;

[0006] A piston assembly, which includes a piston head and a piston rod. The piston head is slidably arranged in the receiving cavity, and the piston head is in sealing cooperation with the cavity wall of the receiving cavity; one end of the piston rod is connected to the piston head, and the other end extends out of the receiving cavity through the second opening and is in sealing cooperation with the second opening;

[0007] A cover plate, which is arranged at the first opening. On a projection plane perpendicular to the first direction, the projection of the cover plate at least covers the gap between the piston head and the cavity wall of the receiving cavity.

[0008] In one embodiment, the piston assembly is provided with a liquid guiding channel, which extends away from the first opening from a side of the piston assembly close to the first opening to the outside of the receiving cavity, and the liquid guiding channel communicates with an external oil tank of the press outside the receiving cavity.

[0009] In one embodiment, an oil supply port is arranged at the cylinder body close to the first opening, and the oil supply port communicates with the external oil tank.

[0010] In one embodiment, the piston rod includes a first section and a second section arranged along the first direction; at least a part of the first section extends near the first opening on the side of the piston head close to the first opening; at least a part of the second section extends away from the first opening on the side of the piston head far from the first opening and extends to the outside of the accommodating cavity; the cross-section of the first section perpendicular to the first direction is larger than the cross-section of the second section perpendicular to the first direction; the liquid guiding channel extends along the piston rod.

[0011] In one embodiment, the liquid guiding channel includes a main channel and an auxiliary channel. The main channel extends to the outside of the accommodating cavity along the first direction, and the auxiliary channel extends from the outer peripheral wall of the first section along the second direction to communicate with the main channel, where the first direction intersects the second direction; and / or,

[0012] The cover plate is provided with an avoidance hole, and the avoidance hole at least avoids the first section.

[0013] In one embodiment, the cylinder block includes a housing and a bottom cover. The bottom cover is arranged at one end of the housing along the first direction far from the first opening. The second opening is provided on the bottom cover, and the bottom cover is fixedly connected to the housing.

[0014] In one embodiment, the cover plate is fixedly connected to the housing; and / or,

[0015] An inspection hole communicating with the accommodating cavity is provided on the bottom cover. The cylinder block includes a plugging member, and the plugging member penetrates through the inspection hole and is in sealing fit with the bottom cover.

[0016] In one embodiment, a first fastening hole is provided on the piston head, a second fastening hole is provided at the corresponding position on the cover plate, and the cylinder block includes a fastening member. The fastening member penetrates through the first fastening hole and the second fastening hole to fixedly connect the piston head and the cover plate.

[0017] In one embodiment, the piston assembly includes a sealing member. A sealing groove is provided on the circumference of the piston head, and the sealing member is arranged in the sealing groove. The sealing member is in interference fit with the inner wall of the accommodating cavity.

[0018] In one embodiment, the sealing member is a Y-shaped sealing ring.

[0019] For the balance cylinder of the press provided in this application, the cover plate is arranged at the first opening, and on the projection plane perpendicular to the first direction, the projection of the cover plate at least covers the gap between the piston head and the cavity wall of the accommodation cavity. That is to say, at the first opening, the cover plate blocks the gap between the piston head and the cavity wall of the accommodation cavity in the first direction. In this way, when the seal in the gap between the piston head and the cavity wall of the accommodation cavity is damaged and the high-pressure gas sprays out from the damaged part, the lubricating oil on the cavity wall of the accommodation cavity is blown to the first opening by the high-pressure gas and blocked by the cover plate, and cannot spray out from the first opening, reducing the risk of lubricating oil leakage. After the piston head stops moving, under the action of gravity, the lubricating oil blown onto the cover plate can also flow back under the action of gravity, which is beneficial to the reuse of the lubricating oil. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the balance cylinder in an embodiment of this application;

[0021] Figure 2 is a schematic structural diagram of the unfolded balance cylinder in an embodiment of this application.

[0022] Description of the Reference Numerals

[0023] 100, balance cylinder; 1, cylinder block; 11, accommodation cavity; 12, first opening; 13, second opening; 14, injection port; 15, oil supply port; 16, housing; 17, bottom cover; 171, inspection hole; 18, plugging member; 19, fastening member; 2, piston assembly; 21, piston head; 211, first fastening hole; 22, piston rod; 221, first section; 222, second section; 23, liquid guiding channel; 231, main channel; 232, auxiliary channel; 24, seal; 3, cover plate; 31, avoidance hole; 32, second fastening hole. Detailed Description of the Embodiment

[0024] It should be noted that, without conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. The detailed description in the specific implementation manners should be understood as an explanatory description of the purpose of this application and should not be regarded as an improper limitation of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically and clearly defined.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0029] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense. It can be direct contact, or contact through an intermediate medium layer. It can be contact where there is basically no mutual force between the two contacting objects, or contact where there is a mutual force between the two contacting objects.

[0032] The embodiments of the present application provide a balance cylinder 100 for a press. Please refer to Figures 1 to 2 , which includes a cylinder block 1, a piston assembly 2, and a cover plate 3. The cylinder block 1 is provided with a receiving cavity 11, a first opening 12, and a second opening 13 that are all communicated with the receiving cavity 11. The first opening 12 and the second opening 13 are arranged at opposite ends of the receiving cavity 11 along a first direction. The piston assembly 2 includes a piston head 21 and a piston rod 22. The piston head 21 is slidably arranged in the receiving cavity 11, and the piston head 21 is in sealing cooperation with the cavity wall of the receiving cavity 11. One end of the piston rod 22 is connected to the piston head 21, and the other end extends out of the receiving cavity 11 through the second opening 13 and is in sealing cooperation with the second opening 13. The cover plate 3 is arranged at the first opening 12. On the projection plane perpendicular to the first direction, the projection of the cover plate 3 at least covers the gap between the piston head 21 and the cavity wall of the receiving cavity 11.

[0033] A press is a mechanical device that causes materials to undergo plastic deformation, cutting, or assembly through pressure, and is widely used in fields such as mechanical manufacturing, automotive, and aerospace, playing a key role in industrial production.

[0034] The balance cylinder 100 is a component in the press, and its main function is to balance the weight and inertial force of the press slider during movement, reduce vibration and impact, improve the working accuracy and stability of the press, and extend the service life of the equipment.

[0035] The cylinder block 1, as the main structure of the balance cylinder 100, provides a receiving space for the internal piston assembly 2, etc., bears the internal pressure and external forces, and plays an important role in the stability and sealing of the overall structure.

[0036] The material of the cylinder block 1 is not limited here. Exemplarily, the material of the cylinder block 1 can be made of high-strength alloy steel or cast iron to ensure sufficient strength and stiffness to bear the internal high pressure and external loads.

[0037] In some embodiments, in order to improve the wear resistance and corrosion resistance of the cylinder block 1, its inner wall can be surface-treated, such as chrome plating, spraying a wear-resistant coating, etc. In addition, the cylinder block 1 can also be provided with structures such as mounting holes, oil ports, exhaust ports, etc., for connecting with other components, introducing or discharging working media, and discharging air to support the normal operation of the balance cylinder 100.

[0038] The accommodation cavity 11 is the space inside the cylinder block 1 for accommodating the piston assembly 2 and the working medium (such as hydraulic oil, air), and it is the core area for the balance cylinder 100 to achieve its functions. Its shape, size, and surface quality will affect the movement performance and sealing effect of the piston assembly 2.

[0039] The first opening 12 and the second opening 13 are the channels through which the cylinder block 1 communicates with the outside, and are used for installing the piston assembly 2, introducing or discharging the working medium, etc. The first opening 12 and the second opening 13 are respectively arranged at the opposite ends of the accommodation cavity 11 along the first direction, providing space and path for the movement of the piston assembly 2.

[0040] The piston assembly 2 is the key component for the balance cylinder 100 to achieve pressure transmission and balance functions. Through reciprocating motion in the accommodation cavity 11, it compresses and pushes the working medium, thereby generating a balancing force.

[0041] The piston head 21 is the main part of the piston assembly 2, which can slide in the accommodation cavity 11, is in sealed cooperation with the cavity wall of the accommodation cavity 11, divides the accommodation cavity 11 into different working chambers, and realizes pressure change and force transmission by changing the volume of the working chambers.

[0042] In some embodiments, the cylinder block 1 is also provided with an injection port 14 through which oil communicates with the accommodation cavity 11, and the working medium is injected into the sealed working chamber through the injection port 14 to push the movement of the piston head 21.

[0043] The shape and size of the piston head 21 will be designed according to specific working requirements, and common ones include cylindrical, disc-shaped, etc. There are various sealing methods between the piston head 21 and the accommodation cavity 11, such as using sealing parts 24 such as O-ring seals and Y-ring seals, or using non-contact sealing methods such as clearance seals and labyrinth seals.

[0044] The piston rod 22 is used to connect the piston head 21 and external components, and transmits the movement of the piston head 21 to the outside. One end of the piston rod 22 is connected to the piston head 21, and the other end extends out of the accommodation cavity 11 through the second opening 13 and is in sealed cooperation with the second opening 13 to improve the leakage of the working medium.

[0045] The piston rod 22 is usually made of high-strength alloy steel and its surface is processed by processes such as quenching and grinding to improve its strength, hardness, and surface finish, and reduce the friction and wear between it and the sealing part 24 of the second opening 13. In addition, components such as a guide sleeve and a dust-proof ring may be provided on the piston rod 22. The guide sleeve is used to guide the movement of the piston rod 22 to improve the straightness of the piston rod 22, and the dust-proof ring prevents external dust and impurities from entering the accommodation cavity 11 and affecting the working performance of the balance cylinder 100.

[0046] The cover plate 3 is arranged at the first opening 12 to play a role in sealing and protection. On the projection plane perpendicular to the first direction, the projection of the cover plate 3 at least covers the gap between the piston head 21 and the cavity wall of the accommodation cavity 11, preventing the leakage of the working medium and the entry of external impurities, and ensuring the normal operation of the balance cylinder 100.

[0047] The first direction is not limited here and can be any direction. For the convenience of description, the first direction in the embodiments of the present application is the direction coinciding with the movement direction of the piston head 21. Generally speaking, the movement of the piston head 21 of the press is the height direction of the press. That is to say, the first direction coincides with the height direction of the press.

[0048] In the related art, the piston head 21 and the cavity wall of the accommodation cavity 11 are in sealed cooperation through a seal 24. However, during the operation of the balance cylinder 100, the piston head 21 and the cavity wall of the accommodation cavity 11 need to move relatively, and lubricating oil needs to be applied to the cavity wall of the accommodation cavity 11 to reduce friction. The seal 24 arranged in the gap between the piston head 21 and the cavity wall of the accommodation cavity 11 is prone to wear during movement. When the piston head 21 moves, the high-pressure gas in the accommodation cavity 11 is likely to spray out from the damaged part of the seal 24, causing the lubricating oil applied to the cavity wall of the accommodation cavity 11 to spray out from the first opening 12, which is likely to cause waste of lubricating oil and pollution of the working environment.

[0049] In the balance cylinder 100 of the press provided in the present application, the cover plate 3 is arranged at the first opening 12, and on the projection plane perpendicular to the first direction, the projection of the cover plate 3 at least covers the gap between the piston head 21 and the cavity wall of the accommodation cavity 11. That is to say, at the first opening 12, the cover plate 3 plays a blocking role in the first direction for the gap between the piston head 21 and the cavity wall of the accommodation cavity 11. In this way, when the seal 24 in the gap between the piston head 21 and the cavity wall of the accommodation cavity 11 is damaged and the high-pressure gas sprays out from the damaged part, the lubricating oil on the cavity wall of the accommodation cavity 11 is blown by the high-pressure gas to the first opening 12 and is blocked by the cover plate 3 and cannot spray out from the first opening 12, reducing the risk of lubricating oil leakage. After the piston head 21 stops moving, under the action of gravity, the lubricating oil blown onto the cover plate 3 can also flow back under the action of gravity, which is beneficial to the recycling of lubricating oil.

[0050] In some embodiments, please refer to Figures 1 to 2 , the piston assembly 2 is provided with a liquid guiding channel 23. The liquid guiding channel 23 extends away from the first opening 12 from the side of the piston assembly 2 close to the first opening 12 to the outside of the accommodation cavity 11, and the liquid guiding channel 23 communicates with the external oil tank of the press outside the accommodation cavity 11.

[0051] The liquid guiding channel 23 is a liquid channel inside the piston assembly 2, which is used to guide media such as lubricating oil to flow in the balance cylinder 100 to achieve recycling.

[0052] The external oil tank is an oil storage device independent of the balance cylinder 100 of the press, used to store media such as lubricating oil required for work, and provide lubricating oil supplement and circulation guarantee for the normal operation of the balance cylinder 100.

[0053] The liquid guiding channel 23 can be of different shapes such as straight, broken line or curved, and is designed according to the structure and working requirements of the piston assembly 2. Its internal diameter size will also be precisely calculated and optimized according to the required flow rate and pressure to ensure that the liquid can flow smoothly without excessive resistance. The inner wall of the channel may be smoothed, such as polished, to reduce friction and energy loss during liquid flow.

[0054] The liquid guiding channel 23 can be formed separately on the piston rod 22, or can be formed jointly by the piston head 21 and the piston rod 22, and is not limited here.

[0055] Under the action of gravity, the lubricating oil on the cavity wall on one side of the first opening 12 of the accommodating cavity 11 will converge on the side of the piston assembly 2 close to the first opening 12. The liquid guiding channel 23 extends away from the first opening 12 from the side of the piston assembly 2 close to the first opening 12. That is to say, the converged lubricating oil flows into the liquid guiding channel 23 at the position where the piston assembly 2 is close to the first opening 12, and then flows out of the accommodating cavity 11 along the liquid guiding channel 23 to the external oil tank of the press.

[0056] By setting the liquid guiding channel 23, the liquid guiding channel 23 serves as a liquid circulation path connecting the accommodating cavity 11 of the balance cylinder 100 and the external oil tank, enabling the lubricating oil to flow directionally between the two, realizing the circulation and supplement of the lubricating oil, and ensuring the lubrication effect and stable working performance in the balance cylinder 100.

[0057] In some embodiments, please refer to Figures 1 to 2 , an oil supply port 15 is provided at the position of the cylinder block 1 close to the first opening 12, and the oil supply port 15 is communicated with the external oil tank.

[0058] The oil supply port 15 is an opening structure provided on the cylinder block 1, and is a channel for lubricating oil to flow between the balance cylinder 100 and the external oil tank, and is used to supply lubricating oil to the inside of the balance cylinder 100.

[0059] The shape and size of the oil supply port 15 are not limited here. Exemplarily, the shape of the oil supply port 15 can be various forms such as circular, square, oval, etc.

[0060] The size of the oil supply port 15 will be precisely designed according to the working flow rate demand and pressure requirement of the balance cylinder 100. For the balance cylinder 100 with a larger flow rate demand, the diameter of the oil supply port 15 is relatively larger. At the same time, in order to improve the connection sealing performance and stability, the edge of the oil supply port 15 can be chamfered, threaded processed, etc.

[0061] In some embodiments, a diversion groove is provided near the oil supply port 15 to guide the lubricating oil into the accommodation cavity 11 more smoothly.

[0062] In some embodiments, the wall surface of the cylinder block 1 around the oil supply port 15 is smoothed to reduce the resistance of the lubricating oil flow.

[0063] The connection design of the oil supply port 15 with the external oil tank enables the lubricating oil to be continuously supplied into the balance cylinder 100. The piston assembly 2 moves frequently in the accommodation cavity 11 and requires continuous lubrication. Timely replenishment of the lubricating oil through the oil supply port 15 is beneficial to reducing the friction and wear between components, prolonging the service life of each component of the balance cylinder 100, and facilitating the stable and efficient operation of the balance cylinder 100.

[0064] In some embodiments, refer to Figures 1 to 2 , the piston rod 22 includes a first section 221 and a second section 222 arranged along the first direction. At least a part of the first section 221 extends near the first opening 12 on the side of the piston head 21 close to the first opening 12; at least a part of the second section 222 extends away from the first opening 12 on the side of the piston head 21 away from the first opening 12, to the outside of the accommodation cavity 11; the cross-section of the first section 221 perpendicular to the first direction is larger than the cross-section of the second section 222 perpendicular to the first direction; the liquid guiding channel 23 extends along the piston rod 22.

[0065] The first section 221 is a part of the piston rod 22 divided along the first direction. At least a part of the first section 221 is on the side of the piston head 21 close to the first opening 12 and extends towards the first opening 12. The first section 221 is connected to the piston head 21 and protrudes from the surface of the side of the piston head 21 close to the first opening 12.

[0066] The second section 222 is another part of the piston rod 22 along the first direction. At least a part of the second section 222 is located on the side of the piston head 21 away from the first opening 12 and extends towards the outside of the accommodation cavity 11 to achieve connection with external components, and provides an extension path for the liquid guiding channel 23.

[0067] The cross-section of the first section 221 perpendicular to the first direction is larger than the cross-section of the second section 222 perpendicular to the first direction. Thus, a stepped surface can be formed between the first section 221 and the second section 222 to cooperate with the piston head 21 to limit the movement of the piston rod 22 in the axial direction.

[0068] The first section 221 and the second section 222 can be made of different materials according to their force-bearing characteristics and functional requirements. For example, since the second section 222 needs to extend out of the accommodating cavity 11 to connect with external components, an alloy steel material with higher strength and better wear resistance can be selected; if the first section 221 mainly plays an auxiliary connection and liquid guiding role, on the basis of ensuring a certain strength, a material with relatively lower cost can be selected.

[0069] The first section 221 and the second section 222 can be of an integral structure, or can adopt various connection methods such as welding, threaded connection, interference fit, etc.

[0070] The connection part between the first section 221 and the piston head 21 needs to ensure good sealing performance and stability. Structures such as the seal 24 and the positioning pin can be adopted, which is beneficial to prevent lubricating oil from leaking from the connection during the movement of the piston head 21, and the piston rod 22 and the piston head 21 can move in coordination.

[0071] When the second section 222 cooperates with the seal 24 at the second opening 13 of the accommodating cavity 11, a guiding structure such as a guide sleeve can be designed to improve the straightness of the movement of the piston rod 22, reduce the wear of the seal 24, and at the same time improve the accuracy of the connection between the outlet of the liquid guiding channel 23 and the outside.

[0072] The reasonable segmented design makes the force distribution of the piston rod 22 more uniform. The first section 221 and the second section 222 play roles at different positions, enhancing the overall structural strength and stability of the piston rod 22. During the movement of the piston assembly 2, it can better withstand pressure and impact, reduce vibration and deformation, which is beneficial to the smooth operation and processing accuracy of the press.

[0073] In some embodiments, please refer to Figures 1 to 2 , the liquid guiding channel 23 includes a main channel 231 and an auxiliary channel 232. The main channel 231 extends along a first direction to the outside of the accommodating cavity 11, and the auxiliary channel 232 extends from the outer peripheral wall of the first section 221 of the piston rod 22 along a second direction to communicate with the main channel 231, where the first direction intersects the second direction.

[0074] The main channel 231 is the main part of the liquid guiding channel 23. The main channel 231 extends along the first direction to the outside of the accommodating cavity 11, which is the main path for the lubricating oil to flow out of the accommodating cavity 11 and connect to the external oil tank, and undertakes the main liquid transmission function.

[0075] The auxiliary channel 232 is the auxiliary part of the liquid guiding channel 23. The auxiliary channel 232 starts from the outer peripheral wall of the first section 221 of the piston rod 22, extends along a second direction intersecting the first direction, and finally communicates with the main channel 231, playing an auxiliary role in collecting and guiding the liquid.

[0076] The second direction is not limited herein, and it only needs to intersect with the first direction. For the convenience of description, the second direction is the radial direction of the first section 221 of the piston rod 22.

[0077] The outer peripheral wall refers to the outer circumferential surface of the first section 221 of the piston rod 22. The auxiliary passage 232 extends from this surface to the internal main passage 231. The lubricating oil is collected outside the first section 221 and introduced into the main passage 231.

[0078] By providing the main passage 231 and the auxiliary passage 232, the lubricating oil located on the side of the piston head 21 close to the first opening 12 and converging near the outer peripheral wall of the first section 221 of the piston rod 22 can smoothly flow into the main passage 231 through the auxiliary passage 232, and then flow out of the accommodation cavity 11 through the main passage 231 and enter the external oil tank. Thus, the circulating flow of the lubricating oil between the balance cylinder 100 and the external oil tank is realized, so that the components in the balance cylinder 100 are well lubricated.

[0079] In some embodiments, the cover plate 3 is provided with an avoidance hole 31, and the avoidance hole 31 at least avoids the first section 221.

[0080] The avoidance hole 31 is a hole processed on the cover plate 3, which is used to provide space for components such as the first section 221 of the piston rod 22, avoid interference, and ensure the normal movement of the components. In addition, the avoidance hole 31 also enables the internal and external gases in the cavity between the cover plate 3 and the piston head 21 to communicate, so that when the piston head 21 moves, it will not be hindered by the sealing of the cavity between the cover plate 3 and the piston head 21.

[0081] In some embodiments, please refer to Figures 1 to 2 , the cylinder block 1 includes a housing 16 and a bottom cover 17. The bottom cover 17 is arranged at one end of the housing 16 away from the first opening 12 along the first direction. A second opening 13 is provided on the bottom cover 17, and the bottom cover 17 is fixedly connected to the housing 16.

[0082] The bottom cover 17 is a part of the cylinder block 1. The bottom cover 17 is arranged at one end of the housing 16 away from the first opening 12 along the first direction, and functions to close the end of the accommodation cavity 11.

[0083] The second opening 13 is an opening provided on the bottom cover 17, that is, the plurality of piston rods 22 pass through the bottom cover 17 and extend out of the accommodation cavity 11.

[0084] The shape of the bottom cover 17 is usually adapted to the end of the housing 16, and is commonly a circular or square flat plate. Its size needs to be calculated according to the inner diameter of the housing 16 and the design requirements of the accommodation cavity 11 to make it fit tightly with the housing 16.

[0085] The thickness of the bottom cover 17 is designed according to the pressure and strength requirements. A thicker bottom cover 17 can better withstand the internal pressure.

[0086] The specific manner of the fastening connection is not limited herein. For example, it can be a bolt connection, a snap connection, etc.

[0087] The cylinder block 1 adopts a split design of the housing 16 and the bottom cover 17. When installing internal components such as the piston assembly 2, the components can be first placed into the housing 16, and then the bottom cover 17 is installed, which is convenient for operation. During maintenance and repair, the components in the accommodation cavity 11 can also be inspected, replaced, and repaired by removing the bottom cover 17, reducing the difficulty of installation and maintenance and improving work efficiency.

[0088] In some embodiments, refer to Figures 1 to 2 , the cover plate 3 is fastened to the housing 16.

[0089] The specific manner of the fastening connection is not limited herein. For example, it can be a bolt connection, a snap connection, etc.

[0090] Exemplarily, a bolt connection is adopted between the cover plate 3 and the housing 16, and a gasket and low-carbon steel wire are arranged on the bolt to achieve the anti-loosening function of the connection.

[0091] Exemplarily, structures such as positioning pins and positioning bosses are arranged on the cover plate 3 and the housing 16 to improve the accuracy of the installation of the cover plate 3 and prevent installation deviation from affecting the sealing effect and the operation of the components.

[0092] In some embodiments, an inspection hole 171 communicating with the accommodation cavity 11 is opened on the bottom cover 17, and the cylinder block 1 includes a plugging member 18 which penetrates through the inspection hole 171 and is in sealing fit with the bottom cover 17.

[0093] The inspection hole 171 is a hole opened on the bottom cover 17, and its purpose is to facilitate the inspection and maintenance of the components inside the cylinder block 1, enabling the staff to enter the accommodation cavity 11 through this hole.

[0094] The plugging member 18 is a component for closing the inspection hole 171, and usually has a shape and size matching the inspection hole 171, and can penetrate through the inspection hole 171 to achieve the sealing of the inspection hole 171 and prevent the substances in the accommodation cavity 11 from leaking. The plugging member 18 and the inspection hole 171 are in sealing fit, and in this way, it can be ensured that there is good sealing between the two to prevent substances such as gas and liquid from leaking from the inspection hole 171.

[0095] The shape of the inspection hole 171 is not limited herein and can be designed according to actual needs. Commonly, there are circular, square, etc. Chamfers or rounded corners can be provided at the edge of the inspection hole 171 to avoid causing harm to the staff during the inspection process.

[0096] The plugging member 18 can take various forms, such as a plug, a cover plate 3, etc. To achieve a better sealing effect, the surface of the plugging member 18 can be polished to improve the fitting degree with the inspection hole 171. At the same time, a sealing washer or a sealing ring can be provided on the plugging member 18 to further enhance the sealing performance.

[0097] To facilitate the installation and removal of the plugging member 18, structures such as a handle or a pull ring can be provided on the plugging member 18.

[0098] The setting of the inspection hole 171 provides a direct access channel for the staff to enter the accommodation cavity 11, eliminating the need to disassemble the entire cylinder block 1 or perform other complex operations, improving the convenience and efficiency of maintenance, and reducing the maintenance time and cost.

[0099] In some embodiments, refer to Figures 1 to 2 , a first fastening hole 211 is provided on the piston head 21, a second fastening hole 32 is provided at the corresponding position on the cover plate 3, and the cylinder block 1 includes a fastener 19 that passes through the first fastening hole 211 and the second fastening hole 32 to firmly connect the piston head 21 and the cover plate 3.

[0100] The first fastening hole 211 is a hole structure provided on the piston head 21, which is used to cooperate with the second fastening hole 32 on the cover plate 3, providing an installation channel for the fastener 19 to achieve the firm connection between the piston head 21 and the cover plate 3.

[0101] The second fastening hole 32 is a hole structure on the cover plate 3 at the position corresponding to the first fastening hole 211 of the piston head 21. Together with the first fastening hole 211 and the fastener 19, it firmly connects the piston head 21 and the cover plate 3 together.

[0102] The fastener 19, as a part connecting the piston head 21 and the cover plate 3, passes through the two fastening holes and applies a fastening force to closely combine the two, ensuring the fixed relative position.

[0103] The shapes of the first fastening hole 211 and the second fastening hole 32 are not limited. Commonly, they are circular, which is convenient for cooperating with fasteners 19 such as bolts and pins.

[0104] The type of the fastener 19 is not limited here. For example, it can be a bolt and nut, a pin, a rivet, etc.

[0105] By firmly connecting the piston head 21 and the cover plate 3 with the fastener 19, the two form a stable whole. During the transportation or storage of the balance cylinder 100, it can better limit the movement freedom of the piston head 21, reduce the damage caused by shaking or offset, and at the same time make the overall structure more compact, reduce the space requirement during transportation and storage, and improve the convenience of transportation and storage of the balance cylinder 100.

[0106] In some embodiments, the piston assembly 2 includes a seal 24 . A sealing groove is provided around the piston head 21 . The seal 24 is disposed in the sealing groove. The seal 24 is interference fit with the inner wall of the accommodating chamber 11 .

[0107] The circumference refers to a circle in the outer circumferential direction of the piston head 21 , where the sealing groove is arranged for installing the sealing member 24 to achieve sealing between the piston head 21 and the inner wall of the accommodating chamber 11 .

[0108] The sealing groove is a groove structure processed around the piston head 21, which is used to accommodate the sealing member 24, provide an installation position and fixing space for the sealing member 24, and assist in enhancing the sealing effect.

[0109] The shape of the sealing groove is not limited here and can be designed according to the type of the sealing member 24 , and common ones include rectangular grooves, trapezoidal grooves, and the like.

[0110] The rectangular groove is easy to process and is suitable for most seals 24; the trapezoidal groove can provide better guidance when installing the seal 24, and when the seal 24 is under pressure, it helps to disperse the stress and improve the sealing reliability.

[0111] The surface roughness and hardness of the sealing groove will also affect the sealing effect. The surface of the sealing groove can be polished to reduce the surface roughness, which can reduce the friction between the seal 24 and the groove wall and extend the service life of the seal 24; the surface hardening of the groove wall can improve its wear resistance and prevent wear and deformation of the seal 24 during extrusion and friction.

[0112] Interference fit is an assembly method, that is, the size of the seal 24 is slightly larger than the space size formed between the sealing groove and the inner wall of the accommodating chamber 11. After assembly, the seal 24 is squeezed, thereby generating pressure between the piston head 21 and the inner wall of the accommodating chamber 11, achieving a tight fit and good sealing effect.

[0113] The size of the interference should be selected according to factors such as the material of the seal 24, working pressure, temperature, etc. If the interference is too large, the friction resistance between the seal 24 and the inner wall of the accommodating chamber 11 will increase, resulting in increased energy consumption when the piston assembly 2 moves, and it is easy to accelerate the wear of the seal 24; if the interference is too small, the sealing effect is poor and leakage may occur.

[0114] The interference fit between the seal 24 and the inner wall of the receiving cavity 11 can form a reliable sealing barrier between the piston head 21 and the receiving cavity 11, preventing the working medium from leaking. Whether it is to prevent liquid overflow under high-pressure conditions or prevent external dust and impurities from entering, it can play a good protective role, maintaining the internal pressure stability of the balance cylinder 100 and ensuring the normal operation of the equipment. The reasonably designed sealing groove and the appropriate seal 24 can reduce the frictional resistance when the piston assembly 2 moves while ensuring sealing. The uniform contact and moderate extrusion between the seal 24 and the inner wall of the receiving cavity 11 reduce local wear, extend the service life of the seal 24 and the piston assembly 2, and reduce the maintenance frequency and cost of the equipment.

[0115] In some embodiments, refer to Figures 1 to 2 , the seal 24 is a Y-shaped sealing ring.

[0116] The Y-shaped sealing ring is a sealing ring whose cross-sectional shape is similar to the letter "Y". It is usually made of elastic materials such as rubber, has good sealing performance and a certain pressure resistance, and is widely used in various occasions that require sealing, such as hydraulic systems, pneumatic systems, etc.

[0117] The lip design of the Y-shaped sealing ring can automatically fit on the inner wall of the receiving cavity 11 under the action of pressure, forming a good sealing effect, preventing the fluid or gas in the receiving cavity 11 from leaking, and improving the working efficiency and performance of the balance cylinder 100. The Y-shaped sealing ring has a certain elasticity and flexibility, and can adapt to different positions and attitude changes of the piston during movement. Even when there is a certain gap change between the piston head 21 and the inner wall of the receiving cavity 11, it can still maintain good sealing performance. At the same time, it can also withstand a certain pressure fluctuation and impact, and is suitable for various different working pressures and working environments.

[0118] In the description of the present application, the description referring to terms such as "in one embodiment", "in some embodiments", "in other embodiments", "in still other embodiments", or "exemplary", etc. means that the specific features, structures, materials or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic expression of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present application and the features of different embodiments or examples.

[0119] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are all included within the protection scope of the present application.

Claims

1. A balancing cylinder for a press, characterized in that: include: A cylinder body, wherein the cylinder body is provided with a containing cavity and a first opening and a second opening both communicated with the containing cavity, wherein the first opening and the second opening are provided at opposite ends of the containing cavity along a first direction; A piston assembly, the piston assembly comprising a piston head and a piston rod, the piston head being slidably disposed in the accommodating cavity, and the piston head being in sealing cooperation with the cavity wall of the accommodating cavity; one end of the piston rod is connected to the piston head, and the other end extends out of the accommodating cavity through the second opening and is in sealing cooperation with the second opening; A cover plate is arranged at the first opening, and on a projection plane perpendicular to the first direction, a projection of the cover plate at least covers a gap between the piston head and a cavity wall of the accommodating cavity.

2. The balancing cylinder of a press machine according to claim 1, characterized in that: The piston assembly is provided with a liquid conducting channel, which extends from a side of the piston assembly close to the first opening away from the first opening to the outside of the accommodating cavity, and the liquid conducting channel is connected to the external oil tank of the press outside the accommodating cavity.

3. The balancing cylinder of a press machine according to claim 2, characterized in that: The cylinder body is provided with an oil supply port near the first opening, and the oil supply port is communicated with the external oil tank.

4. The balancing cylinder of a press machine according to claim 2, characterized in that: The piston rod comprises a first section and a second section arranged along the first direction; at least a portion of the first section extends close to the first opening on a side of the piston head close to the first opening; at least a portion of the second section extends away from the first opening to the outside of the accommodating chamber on a side of the piston head away from the first opening; The cross section of the first section perpendicular to the first direction is larger than the cross section of the second section perpendicular to the first direction; the liquid guiding channel extends along the piston rod.

5. The balancing cylinder of a press machine according to claim 4, characterized in that: The liquid-conducting channel comprises a main channel and an auxiliary channel, wherein the main channel extends along the first direction to the outside of the accommodating cavity, and the auxiliary channel extends from the outer peripheral wall of the first section along the second direction to communicate with the main channel, wherein the first direction intersects with the second direction; and / or, The cover plate is provided with an avoidance hole, and the avoidance hole at least avoids the first section.

6. The balancing cylinder of a press machine according to claim 1, characterized in that: The cylinder body comprises a shell and a bottom cover. The bottom cover is arranged at one end of the shell away from the first opening along the first direction. The second opening is formed on the bottom cover. The bottom cover is firmly connected to the shell.

7. The balancing cylinder of a press machine according to claim 6, characterized in that: The cover plate is firmly connected to the housing; and / or, The bottom cover is provided with an inspection hole communicated with the accommodating cavity, and the cylinder body comprises a blocking piece, which is passed through the inspection hole and sealed with the bottom cover.

8. The balancing cylinder of a press machine according to any one of claims 1 to 7, characterized in that: The piston head is provided with a first fastening hole, the cover plate is provided with a second fastening hole at a corresponding position, the cylinder body comprises a fastener, and the fastener is passed through the first fastening hole and the second fastening hole so that the piston head is fastened to the cover plate.

9. The balancing cylinder of a press machine according to claim 8, characterized in that: The piston assembly comprises a sealing member, a sealing groove is arranged on the circumference of the piston head, the sealing member is arranged in the sealing groove, and the sealing member is interference-fitted with the inner wall of the accommodating cavity.

10. The balancing cylinder of a press machine according to claim 9, characterized in that: The sealing element is a Y-shaped sealing ring.

Images