A main cylinder sealing structure of a cubic press

Abstract

The present application relates to the technical field of sealing of superhard material synthesis, and particularly relates 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 a impurity removing assembly. The impurity removing assembly comprises a first impurity removing unit and a second impurity removing unit. The oil pressure 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 removing unit is used to clean impurities through a negative pressure effect. When the piston is in the second stroke, the second impurity removing unit is used to clean impurities through a negative pressure effect. The sealing assembly is used to prevent the hydraulic oil in the first impurity removing unit and the second impurity removing unit from exchanging with each other. Thus, the impurities are removed, and the sealing cylinder is effectively prevented from being damaged by the impurities.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing of superhard material synthesis, in particular to a main cylinder sealing structure of a cubic press. BACKGROUND

[0002] The cubic press is the main equipment for synthetic diamond synthesis in China, and there are more than ten thousand cubic presses in use in the country. The working pressure of the oil cylinder of the cubic press is in the superhigh pressure hydraulic oil of 70 to 110 MPa, and the reliability design of the piston seal is a difficult point.

[0003] After the piston works for a long time, impurities will be generated on the side wall of the sealing cylinder due to friction. When the hydraulic oil drives the piston to move, the impurities will be embedded in the gap between the piston and the sealing cylinder, causing damage to the sealing cylinder.

[0004] However, in the prior art, a superhigh pressure sealing device for the piston and the oil cylinder of the cubic press is disclosed in Chinese Patent No. CN111637112B, which blocks the impurities from being embedded in the gap between the piston and the sealing cylinder by setting V-shaped sealing rings and O-shaped rubber sealing rings. However, under the superhigh pressure working condition of the hydraulic oil, the impurities may still be extruded by the high pressure hydraulic oil and embedded in the gap between the piston and the sealing cylinder along with the movement of the piston, thereby causing scratches on the side wall of the sealing cylinder. SUMMARY

[0005] Therefore, it is necessary to provide a main cylinder sealing structure of a cubic press in view of the problem that the impurities are embedded in the gap between the piston and the sealing cylinder, causing scratches on the sealing cylinder.

[0006] The above-mentioned purpose is achieved by the following technical scheme:

[0007] A main cylinder sealing structure of a cubic press, comprising:

[0008] a main housing;

[0009] a sealing cylinder coaxially fixedly arranged inside the main housing;

[0010] a piston coaxially and slidingly connected with the sealing cylinder;

[0011] an oil pressure system for driving the piston to slide along the central axis direction of the sealing cylinder;

[0012] The impurity removal assembly comprises a first impurity removal unit and a second impurity removal unit, and the oil pressure system has a first stroke and a second stroke when the piston slides in the sealed cylinder; when the piston is at the first stroke, the first impurity removal unit removes the impurities generated by the relative movement between the piston and the sealed cylinder by using the negative pressure effect; when the piston is at the second stroke, the second impurity removal unit removes the impurities generated by the relative movement between the piston and the sealed cylinder by using the negative pressure effect.

[0013] The sealing assembly is arranged on the side wall of the piston, and is used to prevent the hydraulic oil from flowing through the gap between the side wall of the piston and the sealed cylinder.

[0014] Further, the first impurity removal unit comprises a first impurity removal ring rotatably arranged 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 have openings directed away from the central axis thereof, and the plurality of first collection grooves are arranged in a circumferential interval around the central axis of the first impurity removal ring; the first through groove is in an annular structure, and the first through groove is connected to all the first collection grooves.

[0015] Further, the second impurity removal unit comprises a second impurity removal ring rotatably arranged 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 have openings directed away from the central axis thereof, and the plurality of second collection grooves are arranged in a circumferential interval around the central axis of the second impurity removal ring; the second through groove is in an annular structure, and the second through groove is connected to all the second collection grooves.

[0016] Further, the first collection groove is arranged in an inclined manner, the first collection groove extends along the central axis thereof, and the central axis of the first collection groove is arranged at an angle with the central axis of the first impurity removal ring.

[0017] Further, the second collection groove is arranged in an inclined manner, the second collection groove extends along the central axis thereof, and the central axis of the second collection groove is arranged at an angle with the central axis of the second impurity removal ring.

[0018] Further, the oil pressure system comprises a first oil path unit and a second oil path unit; when the piston is at the first stroke, the first oil path unit causes the hydraulic oil containing impurities to be discharged through the first collection groove and the first through groove by using the negative pressure effect; when the piston is at the second stroke, the second oil path unit causes the hydraulic oil containing impurities to be discharged through the second collection groove and the second through groove by using the negative pressure effect.

[0019] Further, the oil pressure system further comprises a first oil inlet, a second oil inlet and a connector, the first oil inlet and the second oil inlet are arranged on the connector, the connector is detachably connected with the connecting cylinder, the first oil pipe is communicated with the first oil inlet, and the second oil pipe is communicated with the second oil inlet.

[0020] Further, the oil pressure system further comprises a first oil inlet, a second oil inlet and a connector, the first oil inlet and the second oil inlet are arranged on the connector, the connector is detachably connected with the connecting cylinder, the first oil pipe is communicated with the first oil inlet, and the second oil pipe is communicated with the second oil inlet.

[0021] Further, the sealing assembly comprises at least one set of sealing units, the sealing units are arranged at intervals between the first impurity removing ring and the second impurity removing ring, and the sealing units are all used for preventing the hydraulic oil in the first oil cavity and the second oil cavity from being exchanged.

[0022] Further, the sealing units all comprise a sealing ring and a sealing pad, the sealing ring is movably arranged on the piston, and the sealing pad is movably arranged on the sealing ring and close to the outer side of the sealing cylinder; when the piston slides along the central axis direction of the sealing cylinder, the sealing ring is deformed to push the sealing pad to slide along the direction perpendicular to the central axis of the sealing cylinder.

[0023] The beneficial effects of the present application are as follows:

[0024] 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

[0025] 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;

[0026] Figure 2 for Figure 1 The front view;

[0027] Figure 3 for Figure 2 Cross-sectional view along section AA;

[0028] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0029] Figure 5 for Figure 3 A magnified view of a portion of point B in the middle;

[0030] Figure 6 for Figure 3 A magnified view of a portion of point C in the middle;

[0031] Figure 7 for Figure 2 A schematic diagram of the exploded structure;

[0032] Figure 8 for Figure 7 A schematic diagram of the structure of the first impurity removal ring;

[0033] Figure 9 for Figure 7 A schematic diagram of the structure of the second impurity removal ring.

[0034] in:

[0035] 100, main housing; 101, connecting plate; 102, piston; 103, sleeve; 104, cover; 105, sealed cylinder; 106, connecting cylinder; 107, bellows; 110, connector; 111, first oil inlet; 112, second oil inlet;

[0036] 210, first impurity removal unit; 211, first impurity removal ring; 212, first collection groove; 213, first through groove;

[0037] 220, second impurity removal unit; 221, second impurity removal ring; 222, second collection groove; 223, second through groove;

[0038] 311, first oil passage; 312, first oil pipe; 313, first oil cavity; 314, oil groove; 321, second oil passage; 322, second oil pipe; 323, second oil cavity;

[0039] 400, sealing unit; 401, sealing ring; 402, sealing gasket. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0041] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" of the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] 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.

[0043] 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.

[0044] like Figure 1 and Figure 2 As 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.

[0045] 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.

[0046] 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.

[0047] 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 3In the vertical direction, the region near the side wall of the sealing cylinder 105 forms a high pressure region, while the region near the central axis of the piston 102 forms a low pressure region. This pressure difference forms a negative pressure effect, so that the first impurity removal unit 210 extrudes the hydraulic oil containing impurities to the low pressure region, which is equivalent to the hydraulic oil containing impurities being sucked to the low pressure region, and finally being discharged out of the sealing cylinder 105.

[0048] Similarly, when the high pressure hydraulic oil drives the piston 102 to slide downward, the piston 102 is in the second stroke, in which the region near the side wall of the sealing cylinder 105 forms a high pressure region, while the region near the central axis of the piston 102 forms a low pressure region. This pressure difference forms a negative pressure effect, so that the second impurity removal unit 220 extrudes the hydraulic oil containing impurities to the low pressure region, which is equivalent to the hydraulic oil containing impurities being sucked to the low pressure region, and finally being discharged out of the sealing cylinder 105. Therefore, it is ensured that when the piston 102 reciprocates along the central axis direction of the sealing cylinder 105, the impurities can be effectively discharged out of the sealing cylinder 105.

[0049] At the same time, the main cylinder sealing structure of the six-face press further comprises a sealing assembly arranged on the side wall of the piston 102, which is used to block the flow of hydraulic oil between the side wall 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 regions of the first and second impurity removal units 210 and 220, so as to limit the exchange of hydraulic oil between the first and second impurity removal units 210 and 220 through the gap between the side wall of the piston 102 and the sealing cylinder 105. Therefore, it is effectively ensured that the impurity removal units can effectively remove impurities.

[0050] It is worth noting that, in order to further ensure the sealing effect, the gap between the piston 102 and the sealing cylinder 105 at the installation position of the sealing assembly is smaller than the gap between the piston 102 and the sealing cylinder 105 at the installation position of the first or second impurity removal unit 210 or 220. At the installation position of the sealing assembly, the gap between the piston 102 and the sealing cylinder 105 is 0.05mm to 0.08mm; at the position where the first or second impurity removal unit 210 or 220 is arranged, the gap between the piston 102 and the sealing cylinder 105 is 0.5mm to 1.0mm. In particular, the setting of the gap belongs to the prior art, which will not be described here. Not only does it ensure stable sealing performance and effectively block the exchange of hydraulic oil between the two impurity removal units, but it also avoids direct rigid contact between the piston 102 and the sealing cylinder 105, effectively preventing the piston 102 from being pulled.

[0051] It is worth noting that based on the actual working condition requirements, the piston 102 adopts a stepped variable diameter structure. The top end of the piston 102 in contact with the diamond adopts a small diameter cylinder to adapt to the 8MPa low pressure working condition; the bottom end adopts a large diameter pressure bearing surface to withstand the 100MPa high pressure working condition, and the top end and the bottom end are transitioned by a tapered surface to realize stress optimized distribution. This pressure difference not only ensures sufficient processing force, but also avoids unnecessary energy loss. The entire sealing structure can still maintain stable sealing performance under very high pressure, thereby effectively prolonging the service life of the equipment. In particular, the hydraulic system selects 100MPa as the pressure of the hydraulic oil, which is the prior art, and will not be described here.

[0052] In one embodiment, the first impurity removal unit 210 includes a first impurity removal ring 211 rotatably arranged 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, and the plurality of first collection grooves 212 are arranged in a circumferential interval around the central axis of the impurity removal ring. The first collection groove 212 has an opening facing away from the central axis thereof, and the first through groove 213 is an annular structure, and the first through groove 213 communicates all the first collection grooves 212.

[0053] Further, the second impurity removal unit 220 includes a second impurity removal ring 221 rotatably arranged 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, and the plurality of second collection grooves 222 are arranged in a circumferential interval around the central axis of the impurity removal ring. The second collection groove 222 has an opening facing away from the central axis thereof, and the second through groove 223 is an annular structure, and the second through groove 223 communicates all the second collection grooves 222.

[0054] In one embodiment, the oil pressure system includes a first oil path unit and a second oil path unit. When the piston 102 slides upward, the piston 102 is in the first stroke, that is, the up-down direction in the figure, the first oil path unit makes the hydraulic oil containing impurities flow out through the first collection groove 212 and the first through groove 213 by negative pressure effect; when the piston 102 slides downward, the piston 102 is in the second stroke, the second oil path unit makes the hydraulic oil containing impurities flow out through the second collection groove 222 and the second through groove 223 by negative pressure effect. Figure 3

[0055] In one embodiment, the main cylinder sealing structure of the six-sided top press further includes a bellows 107 and a connecting cylinder 106. The connecting cylinder 106 is fixedly connected with the piston 102, and the bellows 107 is coaxially arranged inside the connecting cylinder 106.

[0056] ​In one of the embodiments, the main cylinder sealing structure of the cubic press further comprises a first oil inlet 111, a second oil inlet 112 and a connecting cylinder 106. The first oil inlet 111 and the second oil inlet 112 are arranged on the connector 110, and the connecting cylinder 106 is detachably connected with the connector 110. One end of the bellows 107 is fixedly connected with the piston 102, and the other end of the bellows 107 is connected with the connector 110.

[0057] Further, the first oil passage unit comprises a first oil pipe 312, a plurality of first oil channels 311 and a plurality of oil grooves 314. The plurality of first oil channels 311 are arranged circumferentially around the central axis of the sealing cylinder 105, and the plurality of oil grooves 314 are arranged circumferentially around the central axis of the sealing cylinder 105. One end of the oil groove 314 is in communication with the first through groove 213, and the other end of the oil groove 314 is in communication with the first oil channel 311. In addition, the sealing cylinder 105, the piston 102 and the sleeve 103 jointly form a first oil cavity 313, the first oil cavity 313 is in communication with the first oil pipe 312 through the first oil channel 311, the first oil pipe 312 is in communication with the inside of the bellows 107, and the first oil pipe 312 is in communication with the first oil inlet 111. The second oil passage unit comprises a second oil pipe 322 and a plurality of second oil channels 321, and the plurality of second oil channels 321 are arranged circumferentially around the central axis of the sealing cylinder 105. One end of the second oil channel 321 is in communication with the second through groove 223, and the other end of the second oil channel 321 is in communication with the second oil pipe 322. In addition, the piston 102, the sealing cylinder 105 and the connecting cylinder 106 jointly form a second oil cavity 323, the second oil cavity 323 is in communication with the second oil pipe 322, and the second oil pipe 322 is in communication with the second oil inlet 112.

[0058] Specifically, before the piston 102 starts to work, the sealing cylinder 105 is pre-filled with clean hydraulic oil. When the hydraulic oil is continuously injected into the second oil cavity 323 through the second oil pipe 322, the area of the second oil cavity 323 is increased, so as to push the piston 102 to slide upward, that is, Figure 3The impurities in the gap between the piston 102 and the sealing cylinder 105 flow into the first collecting groove 212 along with the sliding of the piston 102, i.e. the impurities flow from the upper end to the lower end of the first collecting groove 212. Further, as the piston 102 slides upward, the area of the first oil cavity 313 gradually decreases, so that the hydraulic oil in the first oil cavity 313 is squeezed into the first oil channel 311. At this time, the first oil cavity 313 can be considered as an oil inlet end, so the oil pressure at one end of the first oil channel 311 connected with the first oil cavity 313 is higher than that at the other end of the first oil pipe 312, so that the hydraulic oil in the first oil channel 311 generates directional flow from the high-pressure end to the low-pressure end. At the same time, one end of the oil groove 314 is in communication with the area close to the middle of the first oil channel 311, and the other end of the oil groove 314 is in communication with the first oil cavity 313 through the first collecting groove 212 and the first through groove 213, so that the oil groove 314 also forms a condition of gradually decreasing oil pressure from the end close to the first oil cavity 313 to the end close to the first oil channel 311. Therefore, the impurities flowing through the first collecting groove 212 are pushed by the high-pressure hydraulic oil and transported to the low-pressure position, i.e. the connection between the oil groove 314 and the first oil channel 311, through the oil groove 314. At the same time, the flow of hydraulic oil in the first oil channel 311 from the high-pressure end to the low-pressure end will produce a suction effect on the impurity-containing hydraulic oil in the oil groove 314, further sucking the impurity-containing hydraulic oil in the oil groove 314 into the first oil channel 311, and then flowing into the first oil pipe 312, and finally being discharged through the first oil inlet 111.

[0059] It is worth noting that the oil groove 314 is arranged in a curved structure, which is intended to avoid the turbulence and pressure fluctuations caused by the too fast flow of the impurity-containing hydraulic oil into the first oil channel 311 in a straight structure. Such fluctuations will hinder the flow of the impurity-containing hydraulic oil in the first oil channel 311, and even cause backflow. The curved structure effectively plays a role in speed buffering, avoiding the backflow of the impurity-containing hydraulic oil.

[0060] Further, when the hydraulic oil is injected into the first oil cavity 313 through the first oil pipe 312, the area of the first oil cavity 313 increases, thereby pushing the piston 102 to slide downward to reset, i.e. Figure 3The impurities existing in the gap between the piston 102 and the sealing cylinder 105 flow into the second collecting groove 222 along with the sliding of the piston 102, i.e. the impurities flow from the lower end to the upper end of the second collecting groove 222. With the downward sliding of the piston 102, the area of the second oil cavity 323 gradually decreases, so that part of the hydraulic oil in the second oil cavity 323 is squeezed into the second oil channel 321, and one side of the second oil cavity 323 is in communication with the second oil channel 321 through the second collecting groove 222 and the second through groove 223, at this time, the one side of the second oil cavity 323 can be considered as an oil inlet end. Therefore, the oil pressure at the end of the second oil channel 321 connected with the second oil cavity 323 is higher than that at the other end of the first oil pipe 312, so that the directional flow of the hydraulic oil from the high-pressure end to the low-pressure end in the second oil channel 321 is generated. Thus, the impurities flowing through the second collecting groove 222 are transported to the low-pressure position, i.e. the connection position of the second oil channel 321 and the second oil pipe 322, under the pushing of the high-pressure hydraulic oil. At the same time, part of the hydraulic oil in the second oil cavity 323 is also squeezed to be discharged from the second oil inlet 112 through the second oil pipe 322 during the downward sliding of the piston 102, so that the position of the second oil pipe 322 close to the second oil cavity 323 is the high-pressure end, and the position far away from the second oil cavity 323 is the low-pressure end. The flow of the hydraulic oil in the second oil pipe 322 from the high-pressure end to the low-pressure end generates a suction effect on the impurity-containing hydraulic oil in the second oil channel 321, so that the impurity-containing hydraulic oil is further sucked into the second oil pipe 322 through the second oil channel 321, and finally discharged through the second oil inlet 112.

[0061] In one of the embodiments, the first collecting groove 212 is obliquely arranged, and the first collecting groove 212 extends along its central axis, and the central axis of the first collecting groove 212 is arranged at an angle with the central axis of the first impurity removing ring 211.

[0062] In one of the embodiments, the second collecting groove 222 is obliquely arranged, and the second collecting groove 222 extends along its central axis, and the central axis of the second collecting groove 222 is arranged at an angle with the central axis of the second impurity removing ring 221.

[0063] Specifically, the inclination of the first collecting groove 212 and the inclination of the second collecting groove 222 prolong the movement path of the impurities in the first collecting groove 212 and the second collecting groove 222, increase the residence time, and further increase the time of the suction effect of the negative pressure on the hydraulic oil containing impurities, thus improving the cleaning efficiency of the impurities. In addition, the first collecting groove 212 guides the hydraulic oil to flow from top to bottom, which will cause the first impurity removal ring 211 to generate a small rotating torque on the piston 102; and the second collecting groove 222 guides the hydraulic oil to flow from bottom to top, which will cause the second impurity removal ring 221 to generate a small rotating torque on the piston 102, which is opposite to the direction of the rotating torque generated by the first impurity removal ring 211. The two opposite rotating torques can offset each other, thereby ensuring the overall stability of the piston 102.

[0064] In particular, during the process of the hydraulic oil in the second oil pipe 322 pushing the piston 102 to slide 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-in in the second oil pipe 322, when the hydraulic oil is introduced from the first oil inlet 111, the hydraulic oil flowing through the first oil pipe 312 and the bellows 107 is preheated, which helps to prevent the hydraulic oil from being subjected to a supercooling shock or a superheating shock after entering the interior of the piston 102 through the first oil pipe 312.

[0065] In one embodiment, the sealing assembly includes at least one set of sealing units 400. The sealing units 400 are arranged between the first impurity removal ring 211 and the second impurity removal ring 221, and each of the sealing units 400 is used to prevent the hydraulic oil in the first oil chamber 313 and the second oil chamber 323 from exchanging with each other.

[0066] In one embodiment, each of the sealing units 400 includes a sealing ring 401 and a sealing gasket 402. The sealing ring 401 is movably arranged on the piston 102, and the sealing gasket 402 is movably arranged on the side of the sealing ring 401 close to the sealing cylinder 105.

[0067] Specifically, when the piston 102 slides along the central axis direction of the sealing cylinder 105, the hydraulic oil in the gap between the piston 102 and the sealing cylinder 105 close to the sealing ring 401 will extrude the sealing ring 401 to deform, thereby pushing the sealing gasket 402 to slide along the central axis of the sealing cylinder 105 towards the sealing cylinder 105, so that the sealing gasket 402 is attached to 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.

[0068] In particular, the present application further improves the reliability of the sealing by arranging two sets of sealing units 400, and the two sets of sealing units 400 are arranged at intervals.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Understandably, the sealing ring 401 is made of an elastic material.

[0073] 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.

[0074] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A main cylinder seal structure of a cubic press, characterized by comprising: The utility model relates to a kind of oil filter, including: Main housing; Sealing cylinder, the sealing cylinder is coaxially fixedly arranged inside the main housing; Piston, the piston is coaxially slidingly connected with the sealing cylinder; Oil pressure system, the oil pressure system is used to drive the piston sliding along the central axis direction of the sealing cylinder; Impurity removal assembly, the impurity removal assembly includes first impurity removal unit and second impurity removal unit, the oil pressure system drives the piston to slide in the sealing cylinder and has first stroke and second stroke;When the piston is in first stroke, the first impurity removal unit uses negative pressure effect to clean the impurities generated by the relative motion between the piston and the sealing cylinder;When the piston is in second stroke, the second impurity removal unit uses negative pressure effect to clean the impurities generated by the relative motion between the piston and the sealing cylinder; Sealing assembly, the sealing assembly is arranged in the side wall of the piston, and the sealing assembly is used to prevent the flow of hydraulic oil between the side wall of the piston and the sealing cylinder; The first impurity removal unit includes first impurity removal ring, and the first impurity removal ring is rotationally arranged in the side wall of the piston;First through slot and a plurality of first collection grooves are provided on the first impurity removal ring, a plurality of first collection grooves have opening towards away from the central axis direction of itself, and a plurality of first collection grooves are circumferentially spaced apart around the central axis of the impurity removal ring;The first through slot is annular structure, and the first through slot is connected with all the first collection grooves; The second impurity removal unit includes second impurity removal ring, and the second impurity removal ring is rotationally arranged in the side wall of the piston;Second through slot and a plurality of second collection grooves are provided on the second impurity removal ring, a plurality of second collection grooves have opening towards away from the central axis direction of itself, and a plurality of second collection grooves are circumferentially spaced apart around the central axis of the impurity removal ring;The second through slot is annular structure, and the second through slot is connected with all the second collection grooves; The oil pressure system includes first oil path unit and second oil path unit;When the piston is in first stroke, the first oil path unit passes through negative pressure effect, and makes the hydraulic oil containing impurities discharge through the first collection groove and the first through slot;When the piston is in second stroke, the second oil path unit passes through negative pressure effect, and makes the hydraulic oil containing impurities discharge through the second collection groove and the second through slot; The corrugated pipe and the connecting cylinder; the connecting cylinder is fixedly connected with the piston, the corrugated pipe is coaxially arranged in the connecting cylinder, and the corrugated pipe is fixedly connected with the piston; the first oil passage unit comprises a first oil pipe, a plurality of first oil channels and a plurality of oil grooves, the plurality of first oil channels are arranged in a circumferential direction around the central axis of the sealing cylinder, and the plurality of oil grooves are arranged in a circumferential direction around the central axis of the sealing cylinder; the oil groove communicates the first through groove and the first oil channel; the sealing cylinder and the piston jointly enclose a first oil cavity, the first oil cavity is communicated with the first oil pipe through the first oil channel; the first oil pipe is communicated with the inside of the corrugated pipe; the second oil passage unit comprises a second oil pipe and a plurality of second oil channels, the plurality of second oil channels are arranged in a circumferential direction around the central axis of the sealing cylinder, and the second oil channel communicates the second through groove and the second oil pipe; the piston, the sealing cylinder and the connecting cylinder jointly enclose a second oil cavity, and the second oil cavity is communicated with the second oil pipe; The oil pressure system further comprises a first oil inlet, a second oil inlet and a connector, the first oil inlet and the second oil inlet are arranged on the connector, the connector is detachably connected with the connecting cylinder, the first oil pipe is communicated with the first oil inlet, and the second oil pipe is communicated with the second oil inlet.

2. The main cylinder seal structure of a cubic press according to claim 1, characterized by The first collecting groove is arranged in an inclined manner, the first collecting groove extends along its central axis, and the central axis of the first collecting groove is arranged at an angle with the central axis of the first impurity removing ring.

3. The main cylinder seal structure of a cubic press according to claim 1, characterized by, The second collecting groove is arranged in an inclined manner, the second collecting groove extends along its central axis, and the central axis of the second collecting groove is arranged at an angle with the central axis of the second impurity removing ring.

4. The main cylinder seal structure of a cubic press according to claim 1, wherein The sealing assembly comprises at least one set of sealing units, the sealing units are arranged in a spaced manner between the first impurity removing ring and the second impurity removing ring, and the sealing units are used for preventing the hydraulic oil in the first oil cavity and the second oil cavity from being exchanged.

5. The main cylinder seal structure of a cubic press according to claim 4, characterized by The sealing unit comprises a sealing ring and a sealing pad, the sealing ring is movably arranged on the piston, and the sealing pad is movably arranged on the outer side of the sealing ring close to the sealing cylinder; when the piston slides along the central axis direction of the sealing cylinder, the sealing ring deforms and pushes the sealing pad to slide along the direction perpendicular to the central axis of the sealing cylinder.

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