Main cylinder sealing structure of cubic press

Abstract

The invention relates to the technical field of sealing synthesized by superhard materials, in particular to a main cylinder sealing structure of a cubic press, which comprises a main shell, a sealing cylinder coaxially fixed in the main shell, a piston in sliding connection with the sealing cylinder, an oil pressure system for driving the piston to slide along the central axis direction of the sealing cylinder, a sealing assembly and an impurity removal assembly. Wherein the impurity removal assembly comprises a first impurity removal unit and a second impurity removal unit. The hydraulic system has a first stroke and a second stroke when driving the piston to slide; when the piston is in the first stroke, the first impurity removal unit is used for cleaning impurities through the negative pressure effect; and when the piston is in the second stroke, the second impurity removal unit is used for cleaning impurities through the negative pressure effect. And the sealing assembly is used for preventing hydraulic oil in the first impurity removal unit and the second impurity removal unit from being exchanged mutually. Therefore, the impurities are removed, and the sealing cylinder is effectively prevented from being damaged by pulling of the impurities.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for the synthesis of superhard materials, and in particular to a main cylinder sealing structure for a six-sided top press. Background Technology

[0002] The six-sided top press is the main equipment for synthetic diamond synthesis in my country, with more than 10,000 units currently in use nationwide. The piston seal reliability design is a key challenge in this press, as the cylinders operate in ultra-high pressure hydraulic oil ranging from 70 to 110 MPa.

[0003] After prolonged operation, impurities will accumulate on the side wall of the sealing cylinder due to friction. When the hydraulic oil pushes the piston, these impurities will get embedded in the gap between the piston and the sealing cylinder, causing damage to the sealing cylinder.

[0004] However, existing technologies, such as Chinese Patent No. CN111637112B, disclose an ultra-high pressure sealing device for a six-sided top press piston and cylinder. This device uses V-shaped and O-shaped rubber seals to prevent impurities from embedding into the gap between the piston and the sealing cylinder. However, under ultra-high pressure conditions with hydraulic oil, impurities can still be squeezed by the high-pressure hydraulic oil and embedded into the gap between the piston and the sealing cylinder as the piston moves, thus scratching the sidewall of the sealing cylinder. Summary of the Invention

[0005] Therefore, it is necessary to provide a main cylinder sealing structure for a six-sided top press to address the problem of impurities embedding into the gaps between the piston and the side wall of the sealing cylinder, causing damage to the sealing cylinder.

[0006] The above objectives are achieved through the following technical solutions: A main cylinder sealing structure for a six-sided top press includes: main housing; A sealing cylinder is coaxially and fixedly disposed inside the main housing. Piston, which is slidably connected coaxially to the sealing cylinder; A hydraulic system for driving the piston to slide along the central axis of the sealed cylinder; The impurity removal assembly includes a first impurity removal unit and a second impurity removal unit. When the hydraulic system drives the piston to slide within the sealing cylinder, it has a first stroke and a second stroke. When the piston is in the first stroke, the first impurity removal unit uses a negative pressure effect to remove impurities generated by the relative motion between the piston and the sealing cylinder. When the piston is in the second stroke, the second impurity removal unit uses a negative pressure effect to remove impurities generated by the relative motion between the piston and the sealing cylinder. A sealing assembly disposed on the side wall of the piston, the sealing assembly being used to impede the flow of hydraulic oil in the gap between the side wall of the piston and the sealing cylinder.

[0007] Furthermore, the first impurity removal unit includes a first impurity removal ring, which is rotatably disposed on the side wall of the piston; the first impurity removal ring is provided with a first through groove and a plurality of first collection grooves, the plurality of first collection grooves having openings facing away from their own central axis, and the plurality of first collection grooves being circumferentially spaced around the central axis of the impurity removal ring; the first through groove is an annular structure, and the first through groove connects all the first collection grooves.

[0008] Furthermore, the second impurity removal unit includes a second impurity removal ring, which is rotatably disposed on the side wall of the piston; the second impurity removal ring is provided with a second through groove and a plurality of second collection grooves, the plurality of second collection grooves having openings facing away from their own central axis, and the plurality of second collection grooves being circumferentially spaced around the central axis of the impurity removal ring; the second through groove is an annular structure, and the second through groove connects all the second collection grooves.

[0009] Furthermore, the first collection trough is inclined and extends along its own central axis, with the central axis of the first collection trough forming an angle with the central axis of the first impurity removal ring.

[0010] Furthermore, the second collection trough is inclined and extends along its own central axis, with the central axis of the second collection trough forming an angle with the central axis of the second impurity removal ring.

[0011] Furthermore, the hydraulic system includes a first hydraulic circuit unit and a second hydraulic circuit unit; when the piston is in the first stroke, the first hydraulic circuit unit uses a negative pressure effect to discharge hydraulic oil containing impurities through the first collection groove and the first through groove; when the piston is in the second stroke, the second hydraulic circuit unit uses a negative pressure effect to discharge hydraulic oil containing impurities through the second collection groove and the second through groove.

[0012] Furthermore, it also includes a bellows and a connecting cylinder; the connecting cylinder is fixedly connected to the piston, and the bellows is coaxially disposed inside the connecting cylinder, and the bellows is fixedly connected to the piston; the first oil circuit unit includes a first oil pipe, a plurality of first oil passages and a plurality of oil grooves, the plurality of first oil passages are circumferentially arranged around the central axis of the sealing cylinder, and the plurality of oil grooves are circumferentially arranged around the central axis of the sealing cylinder; the oil grooves connect the first through groove and the first oil passage; the sealing cylinder and the piston together form a first oil cavity, and the first oil cavity is connected to the first oil pipe through the first oil passage; the first oil pipe is connected to the interior of the bellows; the second oil circuit unit includes a second oil pipe and a plurality of second oil passages, the plurality of second oil passages are circumferentially arranged around the central axis of the sealing cylinder, and the second oil passages connect the second through groove and the second oil pipe; the piston, the sealing cylinder and the connecting cylinder together form a second oil cavity, and the second oil cavity is connected to the second oil pipe.

[0013] Furthermore, the hydraulic system also includes a first oil inlet, a second oil inlet, and a connector. The first oil inlet and the second oil inlet are both disposed on the connector. The connector is detachably connected to the connecting cylinder. The first oil pipe is connected to the first oil inlet, and the second oil pipe is connected to the second oil inlet.

[0014] Furthermore, the sealing assembly includes at least one set of sealing units, which are spaced apart between the first impurity removal ring and the second impurity removal ring. Each sealing unit is used to prevent the hydraulic oil in the first oil chamber and the second oil chamber from exchanging with each other.

[0015] Furthermore, each sealing unit includes a sealing ring and a sealing gasket. The sealing ring is movably disposed on the piston, and the sealing gasket is movably disposed on the outer side of the sealing ring near the sealing cylinder. When the piston slides along the central axis of the sealing cylinder, the sealing ring deforms, pushing the sealing gasket to slide along a direction perpendicular to the central axis of the sealing cylinder.

[0016] The beneficial effects of this invention are: This invention provides a main cylinder sealing structure for a six-sided top press, comprising: a main housing, a sealing cylinder coaxially fixed within the main housing, a piston slidably connected to the sealing cylinder, a hydraulic system driving the piston to slide along the central axis of the sealing cylinder, a sealing assembly, and a cleaning assembly for removing impurities. The cleaning assembly includes a first cleaning unit and a second cleaning unit. The hydraulic system drives the piston to slide within the sealing cylinder, performing a first stroke and a second stroke. When the piston is in the first stroke, the first cleaning unit cleans impurities generated by the relative motion between the piston and the sealing cylinder using a negative pressure effect. When the piston is in the second stroke, the second cleaning unit cleans impurities generated by the relative motion between the piston and the sealing cylinder using a negative pressure effect. The sealing assembly is located on the side wall of the piston, preventing the flow of hydraulic oil in the gap between the piston side wall and the sealing cylinder, further effectively isolating the working areas of the first and second cleaning units. This improves the efficiency of impurity removal and effectively prevents damage to the sealing cylinder from impurities. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the main cylinder sealing structure of a six-sided top press according to an embodiment of the present invention; Figure 2 for Figure 1 The front view; Figure 3 for Figure 2 Cross-sectional view along section AA; Figure 4 for Figure 3 A magnified view of a portion of point A in the middle; Figure 5 for Figure 3 A magnified view of a portion of point B in the middle; Figure 6 for Figure 3 A magnified view of a portion of point C in the middle; Figure 7 for Figure 2 A schematic diagram of the exploded structure; Figure 8 for Figure 7 A schematic diagram of the structure of the first impurity removal ring; Figure 9 for Figure 7 A schematic diagram of the structure of the second impurity removal ring.

[0018] in: 100. Main housing; 101. Connecting plate; 102. Piston; 103. Sleeve; 104. Cover; 105. Sealing cylinder; 106. Connecting cylinder; 107. Bellows; 110. Connector; 111. First oil inlet; 112. Second oil inlet; 210. First impurity removal unit; 211. First impurity removal ring; 212. First collection tank; 213. First through tank; 220. Second impurity removal unit; 221. Second impurity removal ring; 222. Second collection tank; 223. Second through tank; 311. First oil passage; 312. First oil pipe; 313. First oil cavity; 314. Oil tank; 321. Second oil passage; 322. Second oil pipe; 323. Second oil cavity; 400, sealing unit; 401, sealing ring; 402, sealing gasket. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The following reference Figures 1 to 9 The main cylinder sealing structure of the six-sided top press provided in the embodiments of the present invention is described.

[0023] like Figure 1 and Figure 2As shown, the main cylinder sealing structure of the six-sided top press provided by the present invention is particularly suitable for processing diamond materials, and can also be used for processing hard materials under other working conditions when appropriate.

[0024] Specifically, the main cylinder sealing structure of the six-sided top press includes a connecting plate 101, a main housing 100, a piston 102, a sealing cylinder 105, a sleeve 103, and a cover 104. The connecting plate 101 is fixedly mounted on the main housing 100, and multiple six-sided top presses are interconnected via the connecting plate 101. The sealing cylinder 105 is coaxially mounted inside the main housing 100 and is detachably connected to the main housing 100 via the cover 104. The cover 104 also restricts the sliding of the sealing cylinder 105 along its central axis, preventing it from detaching from the main housing 100. The sleeve 103 is detachably connected to the sealing cylinder 105, and the piston 102 is coaxially and slidably connected to the sealing cylinder 105. The sleeve 103 is located inside the sealing cylinder 105, and slides in conjunction with the piston 102. The sleeve 103 restricts the sliding of the piston 102 along its central axis, preventing it from detaching from the sleeve 103 and the sealing cylinder 105.

[0025] The main cylinder sealing structure of the six-sided top press also includes a hydraulic system and a cleaning assembly. The hydraulic system drives the piston 102 to slide along the central axis of the sealing cylinder 105 via hydraulic oil pressure to achieve diamond processing. The cleaning assembly includes a first cleaning unit 210 and a second cleaning unit 220.

[0026] Before piston 102 operates, the hydraulic system fills the sealed cylinder with hydraulic oil. Then, the hydraulic system further fills the sealed cylinder with hydraulic oil; in this embodiment, the pressure is 100 MPa, meaning the bottom of piston 102 experiences a hydraulic oil pressure of 100 MPa. When the hydraulic oil pushes piston 102 upwards, piston 102 is in its first stroke. Figure 3 In the vertical direction, a high-pressure region is formed near the side wall of the piston 102 and the sealing cylinder 105, while a low-pressure region is formed near the central axis of the piston 102. This pressure difference creates a negative pressure effect, causing the first impurity removal unit 210 to squeeze the hydraulic oil containing impurities into the low-pressure region. At this time, it is equivalent to the hydraulic oil containing impurities being drawn into the low-pressure region and finally discharged from the sealing cylinder 105.

[0027] Similarly, when the high-pressure hydraulic oil drives the piston 102 to slide downwards, the piston 102 is in its second stroke. A high-pressure region is formed near the piston 102 and the side wall of the sealing cylinder 105, while a low-pressure region is formed near the central axis of the piston 102. This pressure difference creates a negative pressure effect, causing the second impurity removal unit 220 to squeeze the hydraulic oil containing impurities into the low-pressure region. This is equivalent to the hydraulic oil containing impurities being drawn into the low-pressure region and ultimately discharged from the sealing cylinder 105. Therefore, it is ensured that impurities are effectively discharged from the sealing cylinder 105 as the piston 102 reciprocates along the central axis of the sealing cylinder 105.

[0028] Meanwhile, the main cylinder sealing structure of the six-sided top press also includes a sealing assembly. This assembly is positioned on the sidewall of the piston 102 and serves to impede the flow of hydraulic oil through the gap between the sidewall of the piston 102 and the sealing cylinder 105. When the piston 102 reciprocates along the central axis of the sealing cylinder 105, the sealing assembly further effectively isolates the working areas of the first impurity removal unit 210 and the second impurity removal unit 220, thus limiting the exchange of hydraulic oil between them through the gap between the sidewall of the piston 102 and the sealing cylinder 105. Therefore, this effectively ensures that the impurity removal units can effectively remove impurities.

[0029] It is worth noting that, to further ensure the sealing effect, the gap between the piston 102 and the sealing cylinder 105 at the sealing assembly mounting position is smaller than the gap between the piston 102 and the sealing cylinder 105 at the mounting positions of the first impurity removal unit 210 or the second impurity removal unit 220. At the sealing assembly mounting position, the gap between the piston 102 and the sealing cylinder 105 is 0.05mm to 0.08mm; at the positions where the first impurity removal unit 210 or the second impurity removal unit 220 is located, the gap between the piston 102 and the sealing cylinder 105 is 0.5mm to 1.0mm. Specifically, the setting of the gap is prior art and will not be elaborated further here. This not only ensures stable sealing performance and effectively prevents hydraulic oil exchange between the two impurity removal units, but also avoids direct rigid contact between the piston 102 and the sealing cylinder 105, effectively preventing damage.

[0030] It is worth noting that, based on actual working conditions, piston 102 adopts a stepped variable diameter structure. The top of piston 102, which contacts the diamond, uses a small-diameter cylinder to adapt to low-pressure conditions of 8MPa; its bottom uses a large-diameter pressure-bearing surface to withstand high-pressure conditions of 100MPa. The top and bottom ends are transitioned by a gradually changing conical surface to achieve optimized stress distribution. This pressure difference not only ensures sufficient processing force but also avoids unnecessary energy loss. The entire sealing structure maintains stable sealing performance under extremely high pressure, thereby effectively extending the service life of the equipment. In particular, the hydraulic system uses 100MPa as the hydraulic oil pressure, which is existing technology and will not be elaborated here.

[0031] In one embodiment, the first impurity removal unit 210 includes a first impurity removal ring 211, which is rotatably disposed on the side wall of the piston 102. The first impurity removal ring 211 is provided with a first through groove 213 and a plurality of first collection grooves 212, which are circumferentially spaced around the central axis of the impurity removal ring. Each first collection groove 212 has an opening facing away from its own central axis. The first through groove 213 has an annular structure and connects all the first collection grooves 212.

[0032] Furthermore, the second impurity removal unit 220 includes a second impurity removal ring 221, which is rotatably disposed on the side wall of the piston 102. The second impurity removal ring 221 is provided with a second through groove 223 and a plurality of second collection grooves 222, which are circumferentially spaced around the central axis of the impurity removal ring. Each second collection groove 222 has an opening facing away from its own central axis. The second through groove 223 has an annular structure and connects all the second collection grooves 222.

[0033] In one embodiment, the hydraulic system includes a first hydraulic circuit unit and a second hydraulic circuit unit. When the piston 102 slides upward, the piston 102 is in its first stroke, i.e. Figure 3 In the vertical direction, the first oil circuit unit causes the hydraulic oil containing impurities to flow out through the first collection groove 212 and the first through groove 213 through the negative pressure effect; when the piston 102 slides downward, the piston 102 is in the second stroke, and the second oil circuit unit causes the hydraulic oil containing impurities to flow out through the second collection groove 222 and the second through groove 223 through the negative pressure effect.

[0034] In one embodiment, the main cylinder sealing structure of the six-sided top press also includes a bellows 107 and a connecting cylinder 106. The connecting cylinder 106 is fixedly connected to the piston 102, and the bellows 107 is coaxially disposed inside the connecting cylinder 106.

[0035] In one embodiment, the main cylinder sealing structure of the six-sided top press further includes a first oil inlet 111, a second oil inlet 112, and a connecting cylinder 106. Both the first oil inlet 111 and the second oil inlet 112 are mounted on the connector 110, and the connecting cylinder 106 is detachably connected to the connector 110. One end of the bellows 107 is fixedly connected to the piston 102, and the other end of the bellows 107 is connected to the connector 110.

[0036] Furthermore, the first oil circuit unit includes a first oil pipe 312, multiple first oil channels 311, and multiple oil grooves 314. The multiple first oil channels 311 are arranged circumferentially around the central axis of the sealing cylinder 105, and the multiple oil grooves 314 are arranged circumferentially around the central axis of the sealing cylinder 105. One end of the oil groove 314 is connected to the first through groove 213, and the other end of the oil groove 314 is connected to the first oil channel 311. In addition, the sealing cylinder 105, piston 102, and sleeve 103 together form a first oil cavity 313. The first oil cavity 313 is connected to the first oil pipe 312 through the first oil channel 311. The first oil pipe 312 is connected to the interior of the bellows 107 and is also connected to the first oil inlet 111. The second oil circuit unit includes a second oil pipe 322 and multiple second oil channels 321, which are arranged circumferentially around the central axis of the sealing cylinder 105. One end of the second oil passage 321 is connected to the second through groove 223, and the other end of the second oil passage 321 is connected to the second oil pipe 322. In addition, the piston 102, the sealing cylinder 105 and the connecting cylinder 106 together form the second oil chamber 323, which is connected to the second oil pipe 322, and the second oil pipe 322 is connected to the second oil inlet 112.

[0037] Specifically, before piston 102 begins to work, the sealed cylinder 105 is pre-filled with clean hydraulic oil. When hydraulic oil continues to be injected into the second oil chamber 323 through the second oil pipe 322, the area of ​​the second oil chamber 323 increases, thereby pushing piston 102 to slide upward. Figure 3The upward and downward direction of the piston 102 causes impurities in the gap between the piston 102 and the sealing cylinder 105 to flow into the first collection groove 212 as the piston 102 slides. That is, the impurities flow from the upper end to the lower end of the first collection groove 212. Furthermore, as the piston 102 slides upward, the area of ​​the first oil chamber 313 gradually decreases, causing the hydraulic oil in the first oil chamber 313 to be squeezed into the first oil passage 311. At this time, the first oil chamber 313 can be considered as the oil inlet end. Therefore, the oil pressure at the end of the first oil passage 311 connected to the first oil chamber 313 is higher than that at the other end of the first oil pipe 312, causing the hydraulic oil to flow directionally from the high-pressure end to the low-pressure end in the first oil passage 311. Meanwhile, one end of the oil tank 314 is connected to the area near the middle of the first oil passage 311, and the other end of the oil tank 314 is connected to the first oil cavity 313 through the first collection tank 212 and the first through groove 213. Therefore, the oil pressure in the oil tank 314 gradually decreases from the end near the first oil cavity 313 to the end near the first oil passage 311. As a result, impurities flowing through the first collection tank 212 are transported to the low-pressure position, i.e., the connection between the oil tank 314 and the first oil passage 311, under the push of the high-pressure hydraulic oil. At the same time, the flow of hydraulic oil in the first oil passage 311 from the high-pressure end to the low-pressure end will have a suction effect on the hydraulic oil containing impurities in the oil tank 314, further drawing the hydraulic oil containing impurities into the first oil passage 311 through the oil tank 314, and then into the first oil pipe 312, and finally discharged through the first oil inlet 111.

[0038] It is worth noting that the oil groove 314 is designed with a curved structure. This is to avoid the turbulence and pressure fluctuations caused by the excessive speed of hydraulic oil containing impurities flowing into the first oil passage 311, which would be a problem with a straight structure. Such fluctuations would hinder the flow of hydraulic oil containing impurities within the first oil passage 311 and could even cause backflow. The curved structure effectively buffers the speed, preventing the backflow of hydraulic oil containing impurities.

[0039] Furthermore, when hydraulic oil is injected into the first oil chamber 313 through the first oil pipe 312, the area of ​​the first oil chamber 313 increases, thereby pushing the piston 102 to slide downwards to achieve reset. Figure 3In the vertical direction, during the downward sliding of piston 102, impurities existing in the gap between piston 102 and sealing cylinder 105 enter the second collection groove 222 as piston 102 slides, i.e., impurities flow from the lower end to the upper end of the second collection groove 222. As piston 102 slides downward, the area of ​​the second oil chamber 323 gradually decreases, causing some of the hydraulic oil in the second oil chamber 323 to be squeezed into the second oil passage 321. One side of the second oil chamber 323 is connected to the second oil passage 321 through the second collection groove 222 and the second through groove 223. At this time, one side of the second oil chamber 323 can be considered as the oil inlet end. Therefore, the oil pressure at the end of the second oil passage 321 connected to the second oil chamber 323 is higher than that at the other end of the first oil pipe 312, causing the hydraulic oil to flow directionally from the high-pressure end to the low-pressure end in the second oil passage 321. Therefore, impurities flowing through the second collection tank 222 are transported to the low-pressure position, i.e., the connection between the second oil passage 321 and the second oil pipe 322, under the push of the high-pressure hydraulic oil. Simultaneously, during the downward sliding of the piston 102, some hydraulic oil in the second oil chamber 323 is also squeezed out through the second oil pipe 322 from the second oil inlet 112. Thus, the position of the second oil pipe 322 near the second oil chamber 323 is the high-pressure end, and the position away from the second oil chamber 323 is the low-pressure end. The flow of hydraulic oil in the second oil pipe 322 from the high-pressure end to the low-pressure end creates a suction effect on the impurity-containing hydraulic oil in the second oil passage 321, further drawing the impurity-containing hydraulic oil through the second oil passage 321 to the second oil pipe 322, and finally discharging it through the second oil inlet 112.

[0040] In one embodiment, the first collection trough 212 is inclined and extends along its own central axis. The central axis of the first collection trough 212 is set at an angle to the central axis of the first impurity removal ring 211.

[0041] In one embodiment, the second collection trough 222 is inclined and extends along its own central axis. The central axis of the second collection trough 222 is set at an angle to the central axis of the second impurity removal ring 221.

[0042] Specifically, the inclined arrangement of the first collection groove 212 and the second collection groove 222 prolongs the movement path of impurities within them, increasing the residence time and thus extending the suction time of the negative pressure effect on the impurity-containing hydraulic oil, thereby improving the impurity removal efficiency. Furthermore, the first collection groove 212 guides the hydraulic oil to flow from top to bottom, causing the first impurity removal ring 211 to generate a small torque on the piston 102; while the second collection groove 222 guides the hydraulic oil to flow from bottom to top, causing the second impurity removal ring 221 to generate a small torque on the piston 102 in the opposite direction to that of the first impurity removal ring 211. These two opposing torques cancel each other out, thus ensuring the overall stability of the piston 102.

[0043] Specifically, during the process of hydraulic oil being introduced into the second oil pipe 322 to push the piston 102 upward, the high-pressure thrust of the hydraulic oil causes the oil temperature to rise, and the heat is then transferred to the first oil pipe 312 and the bellows 107. Since the first oil pipe 312 and the bellows 107 are both built inside the second oil pipe 322, when hydraulic oil is introduced from the first oil inlet 111, the hydraulic oil is preheated as it flows through the first oil pipe 312 and the bellows 107, which helps to prevent the hydraulic oil from experiencing overcooling or overheating shocks after entering the piston 102 through the first oil pipe 312.

[0044] In one embodiment, the sealing assembly includes at least one set of sealing units 400. The sealing units 400 are spaced apart between the first impurity removal ring 211 and the second impurity removal ring 221, and all sealing units 400 are used to prevent the hydraulic oil in the first oil chamber 313 and the second oil chamber 323 from being exchanged with each other.

[0045] In one embodiment, each sealing unit 400 includes a sealing ring 401 and a sealing gasket 402. The sealing ring 401 is movably disposed on the piston 102, and the sealing gasket 402 is movably disposed on the side of the sealing ring 401 near the sealing cylinder 105.

[0046] Specifically, when the piston 102 slides along the central axis of the sealing cylinder 105, the hydraulic oil in the gap between the piston 102 and the sealing cylinder 105 near the sealing ring 401 will squeeze the sealing ring 401 to deform it, thereby pushing the sealing gasket 402 to slide along the direction perpendicular to the central axis of the sealing cylinder 105 towards the sealing cylinder 105, so that the sealing gasket 402 fits against the side wall of the sealing cylinder 105, achieving a sealing effect, thereby preventing the hydraulic oil in the first oil chamber 313 and the second oil chamber 323 from exchanging with each other, and ensuring the effectiveness of impurity removal.

[0047] In particular, the present invention further improves the reliability of sealing by setting two sets of sealing units 400, and the two sets of sealing units 400 are arranged at intervals.

[0048] It is worth noting that when piston 102 slides upward, that is... Figure 4 In the vertical direction, the area between the first impurity removal ring 211 and the sealing cylinder 105 is a high-pressure zone. The area between the sealing gasket 402 at the upper end of the piston 102 and the first impurity removal ring 211 is defined as the first region, and the area between the sealing gasket 402 at the lower end of the piston 102 and the second impurity removal ring 221 is defined as the second region. At this time, the hydraulic oil in the gap between the piston 102 and the sealing cylinder 105 in the first region is constantly squeezed downwards by the hydraulic oil in the high-pressure zone. However, because the sealing gasket 402 at the upper end of the piston 102 remains sealed, the hydraulic oil in this gap is stationary relative to the piston 102, thus ensuring that the hydraulic oil containing impurities flowing through the first impurity removal ring 211 does not enter this gap, but instead all enters the oil sump 314 through the first collection groove 212, and is finally discharged from the first oil inlet 111 under the negative pressure effect of the system.

[0049] Similarly, when the piston 102 slides downward, the area between the second impurity removal ring 221 and the sealing cylinder 105 is a high-pressure zone. At this time, the hydraulic oil in the gap between the piston 102 and the sealing cylinder 105 in the second area is always squeezed upward by the hydraulic oil in this high-pressure zone. However, since the sealing gasket 402 at the lower end of the piston 102 is always in the sealing stage, the hydraulic oil in this gap is stationary relative to the piston 102. This ensures that the hydraulic oil containing impurities flowing through the second impurity removal ring 221 will not enter this gap, but will instead enter the second oil passage 321 through the second collection groove 222, and finally be discharged from the second oil inlet 112 under the negative pressure effect of the system.

[0050] Specifically, a sealing ring 401 and a sealing gasket 402 are also provided between the piston 102 and the sleeve 103. Specifically, when the piston 102 slides along the central axis of the sealing cylinder 105, the hydraulic oil in the gap between the piston 102 and the sleeve 103 squeezes the sealing ring 401, causing it to deform. This pushes the sealing gasket 402 to slide along a direction perpendicular to the central axis of the sealing cylinder 105 towards the sealing cylinder 105, so that the sealing gasket 402 fits against the inner wall of the sleeve 103, achieving a sealing effect and preventing the hydraulic oil in the first oil chamber 313 from leaking to the outside of the device.

[0051] Understandably, the sealing ring 401 is made of an elastic material.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A main cylinder sealing structure for a six-sided top press, characterized in that, include: main housing; A sealing cylinder is coaxially and fixedly disposed inside the main housing. Piston, which is slidably connected coaxially to the sealing cylinder; A hydraulic system for driving the piston to slide along the central axis of the sealed cylinder; The impurity removal assembly includes a first impurity removal unit and a second impurity removal unit. When the hydraulic system drives the piston to slide within the sealing cylinder, it has a first stroke and a second stroke. When the piston is in the first stroke, the first impurity removal unit uses a negative pressure effect to remove impurities generated by the relative motion between the piston and the sealing cylinder. When the piston is in the second stroke, the second impurity removal unit uses a negative pressure effect to remove impurities generated by the relative motion between the piston and the sealing cylinder. A sealing assembly disposed on the side wall of the piston, the sealing assembly being used to impede the flow of hydraulic oil in the gap between the side wall of the piston and the sealing cylinder.

2. The main cylinder sealing structure of the six-sided top press according to claim 1, characterized in that, The first impurity removal unit includes a first impurity removal ring, which is rotatably disposed on the side wall of the piston; the first impurity removal ring is provided with a first through groove and a plurality of first collection grooves, the plurality of first collection grooves having openings facing away from their own central axis, and the plurality of first collection grooves being circumferentially spaced around the central axis of the impurity removal ring; the first through groove is an annular structure, and the first through groove connects all the first collection grooves.

3. The main cylinder sealing structure of the six-sided top press according to claim 2, characterized in that, The second impurity removal unit includes a second impurity removal ring, which is rotatably disposed on the side wall of the piston; the second impurity removal ring is provided with a second through groove and a plurality of second collection grooves, the plurality of second collection grooves having openings facing away from their own central axis, and the plurality of second collection grooves being circumferentially spaced around the central axis of the impurity removal ring; the second through groove is an annular structure, and the second through groove connects all the second collection grooves.

4. The main cylinder sealing structure of the six-sided top press according to claim 3, characterized in that, The first collection trough is inclined and extends along its own central axis. The central axis of the first collection trough is set at an angle to the central axis of the first impurity removal ring.

5. The main cylinder sealing structure of the six-sided top press according to claim 4, characterized in that, The second collection trough is inclined and extends along its own central axis. The central axis of the second collection trough is set at an angle to the central axis of the second impurity removal ring.

6. The main cylinder sealing structure of the six-sided top press according to claim 3, characterized in that, The hydraulic system includes a first hydraulic circuit unit and a second hydraulic circuit unit. When the piston is in the first stroke, the first hydraulic circuit unit uses a negative pressure effect to discharge hydraulic oil containing impurities through the first collection groove and the first through groove. When the piston is in the second stroke, the second hydraulic circuit unit uses a negative pressure effect to discharge hydraulic oil containing impurities through the second collection groove and the second through groove.

7. The main cylinder sealing structure of the six-sided top press according to claim 6, characterized in that, It also includes a bellows and a connecting cylinder; the connecting cylinder is fixedly connected to the piston, and the bellows is coaxially disposed inside the connecting cylinder, and the bellows is fixedly connected to the piston; the first oil circuit unit includes a first oil pipe, a plurality of first oil passages and a plurality of oil grooves, the plurality of first oil passages are circumferentially arranged around the central axis of the sealing cylinder, and the plurality of oil grooves are circumferentially arranged around the central axis of the sealing cylinder; the oil grooves connect the first through groove and the first oil passage; the sealing cylinder and the piston together form a first oil cavity, and the first oil cavity is connected to the first oil pipe through the first oil passage; the first oil pipe is connected to the interior of the bellows; the second oil circuit unit includes a second oil pipe and a plurality of second oil passages, the plurality of second oil passages are circumferentially arranged around the central axis of the sealing cylinder, and the second oil passages connect the second through groove and the second oil pipe; the piston, the sealing cylinder and the connecting cylinder together form a second oil cavity, and the second oil cavity is connected to the second oil pipe.

8. The main cylinder sealing structure of the six-sided top press according to claim 7, characterized in that, The hydraulic system further includes a first oil inlet, a second oil inlet, and a connector. The first oil inlet and the second oil inlet are both located on the connector. The connector is detachably connected to the connecting cylinder. The first oil pipe is connected to the first oil inlet, and the second oil pipe is connected to the second oil inlet.

9. The main cylinder sealing structure of the six-sided top press according to claim 7, characterized in that, The sealing assembly includes at least one set of sealing units, which are spaced apart between the first impurity removal ring and the second impurity removal ring. Each sealing unit is used to prevent the hydraulic oil in the first oil chamber and the second oil chamber from exchanging with each other.

10. The main cylinder sealing structure of the six-sided top press according to claim 9, characterized in that, Each sealing unit includes a sealing ring and a sealing gasket. The sealing ring is movably disposed on the piston, and the sealing gasket is movably disposed on the outer side of the sealing ring near the sealing cylinder. When the piston slides along the central axis of the sealing cylinder, the sealing ring deforms, pushing the sealing gasket to slide along a direction perpendicular to the central axis of the sealing cylinder.

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