A hydraulic cylinder assembly with high sealing performance

Abstract

The present invention relates to the technical field of hydraulic cylinders, and discloses a hydraulic cylinder assembly with high sealing performance, including a multi-stage cylinder, the multi-stage cylinder including a cylinder shell, a first-stage piston rod slidably connected in the cylinder shell, a second-stage piston rod slidably connected in the first-stage piston rod, a fixing device for limiting the sliding of the first-stage piston rod is arranged in the first-stage piston rod, the fixing device includes a movable groove, the movable groove is arranged in the side wall of the first-stage piston rod, a plug-in rod is slidably connected in the movable groove, one end of the plug-in rod is plugged in the fixed groove, the plug-in receiving of the plug-in rod is driven by a driving block, and the driving block is installed on a rotating driving device. This solution has the beneficial effect of freely controlling the piston rod to be pushed, and solves the problem that in some specific usage scenarios, the multi-stage hydraulic cylinder of the prior art cannot push the required piston rod as required.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder component with high sealing performance. Background Art

[0002] A hydraulic cylinder is a commonly used hydraulic transmission device, usually composed of a cylinder body, a piston, a piston rod, a seal, an oil inlet and an oil outlet, etc. Its working principle is to use the pressure of a liquid (usually oil) to transmit force and motion, converting hydraulic energy into mechanical energy.

[0003] A multi-stage hydraulic cylinder is a hydraulic transmission device used to generate or withstand large forces or movements. It consists of multiple pistons that are connected in a certain order to form a multi-stage structure. In a hydraulic system, a multi-stage hydraulic cylinder can provide greater thrust or pull force and can achieve a larger stroke in a relatively small space. This design makes multi-stage hydraulic cylinders very useful in some applications that require high force output but are limited by space, such as construction machinery, metallurgical equipment, ships, aerospace and other fields.

[0004] However, the multi-stage hydraulic cylinder in the prior art can only push the piston inside the outer shell and then push the piston in the piston rod in a fixed order during use. In addition, the special design of the multi-stage hydraulic cylinder means that the extension length of the piston rod of each stage is smaller and smaller, and the maximum load strength it can withstand is also different. In certain specific usage scenarios, for example, when the direction or size of the load borne by the multi-stage cylinder changes, the piston with a smaller diameter cannot withstand a larger load. At this time, a piston with a larger diameter is required to bear this load. The multi-stage hydraulic cylinder in the prior art cannot push the required piston rod as required; therefore, it does not meet the existing needs. In this regard, we propose a hydraulic cylinder assembly with high sealing performance. Summary of the invention

[0005] The present invention provides a hydraulic cylinder assembly with high sealing performance, which has the beneficial effect of freely controlling the piston rod that needs to be pushed, and solves the problem mentioned in the above background technology that in certain specific usage scenarios, the multi-stage hydraulic cylinder of the prior art cannot push the required piston rod as required.

[0006] The present invention provides the following technical solution: a hydraulic cylinder assembly with high sealing performance, comprising a multi-stage cylinder, the multi-stage cylinder comprising a cylinder shell, a primary piston rod slidably connected in the cylinder shell, a secondary piston rod slidably connected in the primary piston rod, an oil inlet and a primary oil outlet are opened on one side of the cylinder shell, the primary oil outlet is connected to the secondary oil outlet, the secondary oil outlet is opened in the primary piston rod, and an oil through port is opened in the primary piston rod.

[0007] A fixing device for limiting the sliding of the first-level piston rod is provided in the first-level piston rod, and the fixing device includes a movable groove, and the movable groove is opened in the first-level piston rod. A plug-in rod is slidably connected in the movable groove, and a fixing groove is provided at one end of the plug-in rod, and the fixing groove is opened in the cylinder housing. The plug-in of the plug-in rod is driven by a driving block, and the driving block is installed on a rotating driving device.

[0008] A sealing device for blocking the oil passage is arranged in the primary piston rod, and the sealing device includes a mounting groove provided in the primary piston rod, a rotating plate is rotatably connected in the mounting groove, a connecting groove is provided in the rotating plate, the connecting groove is eccentrically arranged on the rotating plate, and the connecting groove is connected to the oil passage.

[0009] As an optional solution of a hydraulic cylinder assembly with high sealing performance described in the present invention, the rotation drive device includes a rotation groove and a C-shaped groove opened at the top of the first-level piston rod, the rotation groove is connected to the C-shaped groove, a driving disk is rotatably connected in the rotation groove, one side of the driving disk is fixedly connected to a connecting rod, the connecting rod is rotatably connected in the C-shaped groove, the other end of the connecting rod is fixedly connected to a rotating disk, the rotating disk is rotatably connected in an empty groove, the empty groove is opened in the first-level piston rod, one side of the rotating disk is fixedly connected to the driving block, and the other side of the rotating disk is installed with the blocking device.

[0010] A limiting groove is provided in the primary piston rod, the limiting groove is communicated with the movable groove, a limiting plate is slidably connected in the limiting groove, the limiting plate is fixedly connected to one side of the plug rod, and the limiting plate is elastically connected to the limiting groove through a limiting spring.

[0011] As an optional solution of a hydraulic cylinder assembly with high sealing performance described in the present invention, a positioning groove is also provided in the first-stage piston rod, the positioning groove is connected to the mounting groove, a positioning ring is rotatably connected in the positioning groove, one end of the positioning ring is fixedly connected to the rotating plate, the outer side wall of the positioning ring is fixedly connected to the inner wall of the rotating disk, a sealing ring is fixedly connected to one side of the rotating plate, and the sealing ring is located in the mounting groove.

[0012] As an optional solution of a hydraulic cylinder assembly with high sealing performance described in the present invention, wherein: one side of the positioning ring is fixedly connected to a limiting ring block, the limiting ring block is rotatably connected in the limiting ring groove, the limiting ring groove is opened at the position where the first-level piston rod is located in the positioning groove, and the limiting ring groove is connected to the positioning groove.

[0013] As an optional solution of a hydraulic cylinder assembly with high sealing performance described in the present invention, a lifting sealing device for sealing the oil passage is arranged in the rotating plate, and the lifting sealing device includes a lifting groove, and the lifting groove is opened on the surface of the rotating plate, and a sealing member is slidably connected in the lifting groove, and a sliding wedge is fixedly connected to one side of the sealing member, and the sliding wedge passes through and is slidably connected in the rotating plate, and a driving wedge is arranged at one end of the sliding wedge, and a driving connecting rod is fixedly connected to one end of the driving wedge, and the driving connecting rod passes through the rotating plate, and the other end of the driving connecting rod is fixedly connected to the driving slider.

[0014] As an optional solution of a hydraulic cylinder assembly with high sealing performance described in the present invention, the driving slider is slidably connected in the driving slide groove, the driving slide groove is opened on the ring block, the ring block is fixedly connected to the primary piston rod at the positioning groove, and a No. 1 convex groove is also arranged in the ring block, and the No. 1 convex groove is connected to the driving slide groove.

[0015] As an optional solution of a hydraulic cylinder assembly with high sealing performance described in the present invention, one side of the sliding wedge block is fixedly connected to a reset connecting plate, one side of the reset connecting plate is fixedly connected to a reset spring, and the other end of the reset spring is fixedly connected to the reset connecting plate on the other side.

[0016] As an optional scheme of a hydraulic cylinder assembly with high sealing performance described in the present invention, a sliding assembly is arranged between the sliding wedge block and the driving wedge block, the sliding assembly includes a sliding groove, the sliding groove is opened on the sliding wedge block, a sliding block is slidably connected in the sliding groove, the sliding block is fixedly connected to the driving wedge block, an anti-slip block is fixedly connected to one side of the sliding block, the anti-slip block is slidably connected to the anti-slip groove, the anti-slip groove is opened on the sliding wedge block, and the anti-slip groove is communicated with the sliding groove.

[0017] As an optional scheme of a hydraulic cylinder assembly with high sealing performance described in the present invention, a secondary sealing assembly is arranged in the primary piston rod, and the secondary sealing assembly includes a connecting groove, which is opened in the primary piston rod, and the connecting groove is communicated with the oil port, and a sliding sealing plate is slidably connected in the connecting groove, a sealing slider is fixedly connected to one side of the sliding sealing plate, and the other end of the sealing slider is slidably connected in the sealing drive groove, and the sealing drive groove is opened on the sealing member, and a No. 2 convex groove is also arranged in the sealing drive groove, and the sealing slider is slidably connected in the swinging groove, and the swinging groove is opened in the primary piston rod, and the swinging groove is communicated with the connecting groove.

[0018] The present invention has the following beneficial effects:

[0019] 1. The hydraulic cylinder assembly with high sealing performance drives the rotating disk to rotate clockwise to drive the plug-in rod in the first-stage piston rod to insert into the fixed groove in the oil cylinder shell, thereby limiting the sliding of the first-stage piston rod in the oil cylinder shell. At the same time, the rotating disk will drive the rotating plate to rotate synchronously, so that the oil through port is connected with the connecting groove. This design effectively ensures that the hydraulic cylinder can only realize the sliding of the second-stage piston rod. Through the counterclockwise rotation of the rotating disk, the driving block will not be able to drive the plug-in rod due to insufficient rotation angle. At this time, the first-stage piston rod can slide in the oil cylinder shell, and the rotating plate will block the oil through port. The hydraulic oil in the oil cylinder shell will not drive the second-stage piston rod to slide. At this time, only the first-stage piston rod of the hydraulic cylinder can slide, and in the initial state, the fixing device does not limit the sliding of the first-stage piston rod and the oil through port is connected with the connecting groove, thereby ensuring the function of the multi-stage oil cylinder. Through this design, the user can only control the piston rod that needs to be extended to meet different work requirements.

[0020] 2. The hydraulic cylinder assembly with high sealing performance can realize the lifting and lowering of the seal by the rotation of the rotating plate. Through this design, it is ensured that the seal does not fit tightly against the oil port when the rotating plate rotates, which effectively reduces the friction of the seal and increases the service life of the seal. When the rotating plate rotates to the maximum position, the seal can effectively seal the oil port, effectively preventing the hydraulic oil from entering the installation groove through the oil port and avoiding oil leakage.

[0021] 3. The hydraulic cylinder assembly with high sealing performance will drive the sealing slider to slide through the sealing driving groove on the sealing member during the rotation of the rotating plate. Due to the design of the No. 2 convex groove in the sealing driving groove, the sealing slider will drive the sliding sealing plate to move left in the connecting groove when it slides to a certain position, thereby sealing the oil port. Since the connection between the oil port and the connecting groove needs to be ensured when the rotating plate rotates forward, the No. 2 convex groove is designed only at one place, which can effectively ensure that the oil port is blocked by the sliding sealing plate when the rotating plate rotates counterclockwise, thereby further ensuring the sealing of internal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0024] Figure 3 The figure is a schematic diagram of the structure of the connection between the driving block and the plug rod of the present invention.

[0025] Figure 4 For the present invention Figure 2 Enlarged structural diagram at A in the middle.

[0026] Figure 5 For the present invention Figure 4 Enlarged structural diagram at B in the middle.

[0027] Figure 6 It is a schematic diagram of the structure of the connection between the driving slider and the driving slide groove of the present invention.

[0028] Figure 7 For the present invention Figure 4 Schematic diagram of the C structure.

[0029] Figure 8 It is a schematic diagram of the structure of the sliding assembly of the present invention.

[0030] Fig. 9 For the present invention Figure 4 Schematic diagram of the D structure.

[0031] Fig.10 It is a schematic diagram of the structure of the connection between the sealing sliding block and the sealing driving groove of the present invention.

[0032] In the figure: 1. Multi-stage oil cylinder; 101. Oil cylinder housing; 102. Primary piston rod; 103. Secondary piston rod; 104. Oil inlet; 105. Primary oil outlet; 106. Secondary oil outlet; 107. Oil through port; 2. Rotary drive device; 201. Rotary slot; 202. C-shaped slot; 203. Drive disk; 204. Connecting rod; 205. Rotating disk; 206. Empty slot; 3. Fixing device; 301. Active slot; 302. Connecting rod; 303. Fixing slot; 304. Limiting slot; 305. Limiting plate; 306. Limiting spring; 307. Driving block; 4. Blocking device; 401. Mounting slot; 402. Rotating plate; 403. Connecting slot; 404. Positioning slot; 405. Positioning ring; 406, limiting ring groove; 407, limiting ring block; 408, sealing ring; 5, lifting and lowering sealing device; 501, lifting and lowering groove; 502, sealing member; 503, sliding wedge block; 504, driving wedge block; 505, driving connecting rod; 506, driving slider; 507, driving slide groove; 508, ring block; 509, No. 1 convex groove; 510, reset connecting plate; 511, reset spring; 6, sliding assembly; 601, sliding groove; 602, sliding block; 603, anti-slip groove; 604, anti-slip block; 7, secondary sealing assembly; 701, connecting groove; 702, sliding sealing plate; 703, sealing slider; 704, sealing driving groove; 705, No. 2 convex groove; 706, swing groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1: This embodiment is intended to help solve the problem that the multi-stage hydraulic cylinder of the prior art cannot push the required piston rod as required in certain specific usage scenarios. Figure 1-10 ,

[0035] A hydraulic cylinder assembly with high sealing performance includes a multi-stage cylinder 1, the multi-stage cylinder 1 includes a cylinder housing 101, a primary piston rod 102 is slidably connected in the cylinder housing 101, a secondary piston rod 103 is slidably connected in the primary piston rod 102, an oil inlet 104 and a primary oil outlet 105 are provided on one side of the cylinder housing 101, the primary oil outlet 105 is connected to the secondary oil outlet 106, the secondary oil outlet 106 is provided in the primary piston rod 102, and an oil through port 107 is provided in the primary piston rod 102.

[0036] A fixing device 3 for limiting the sliding of the first-stage piston rod 102 is provided in the first-stage piston rod 102, and the fixing device 3 includes a movable groove 301, and the movable groove 301 is opened in the first-stage piston rod 102. A plug-in rod 302 is slidably connected in the movable groove 301. A fixing groove 303 is provided at one end of the plug-in rod 302. The fixing groove 303 is opened in the cylinder housing 101. The plug-in of the plug-in rod 302 is driven by a driving block 307, and the driving block 307 is installed on the rotating driving device 2.

[0037] A blocking device 4 for blocking the oil passage 107 is provided in the primary piston rod 102. The blocking device 4 includes a mounting groove 401 provided in the primary piston rod 102. A rotating plate 402 is rotatably connected in the mounting groove 401. A connecting groove 403 is provided in the rotating plate 402. The connecting groove 403 is eccentrically arranged on the rotating plate 402, and the connecting groove 403 is connected to the oil passage 107.

[0038] By slidingly arranging the secondary piston rod 103 in the primary piston rod 102, and the two-stage design of the primary oil outlet 105 and the secondary oil outlet 106, the multi-stage extension of the hydraulic cylinder can be achieved. (This hydraulic cylinder with multi-stage sliding is a prior art and will not be described in detail here). By designing the fixing device 3, under the drive of the rotary drive device 2, the plug-in rod 302 in the primary piston rod 102 can be inserted into the fixing groove 303 of the cylinder housing 101, thereby fixing the primary piston rod 102 in the cylinder housing 101, so that the primary piston rod 102 cannot slide. By designing the blocking device 4, under the drive of the rotary drive device 2, the rotation of the rotating plate 402 can be achieved, thereby realizing whether the connecting groove 403 on the rotating plate 402 is connected with the oil through port 107 (the relative position of the connecting groove 403 and the rotating plate 402 is shown in FIG. 1 ). Figure 3 ), thereby realizing the connection and blockage of the oil port 107. Through the above design, the sliding of the primary piston rod 102 and the secondary piston rod 103 can be effectively controlled by the rotary drive device 2, so that the user can control which piston rod needs to be extended, solving the problem that the multi-stage hydraulic cylinder cannot push the required piston rod as required.

[0039] The rotary drive device 2 includes a rotary groove 201 and a C-shaped groove 202 opened at the top of the primary piston rod 102. The rotary groove 201 is connected to the C-shaped groove 202. A driving disk 203 is rotatably connected in the rotary groove 201. A connecting rod 204 is fixedly connected to one side of the driving disk 203. The connecting rod 204 is rotatably connected in the C-shaped groove 202. The other end of the connecting rod 204 is fixedly connected to a rotating disk 205. The rotating disk 205 is rotatably connected in an empty groove 206. The empty groove 206 is opened in the primary piston rod 102. A driving block 307 is fixedly connected to one side of the rotating disk 205. A sealing device 4 is installed on the other side of the rotating disk 205.

[0040] By manually rotating the driving disk 203, the rotating disk 205 is driven to rotate synchronously through the connecting rod 204 fixedly connected thereto, thereby driving the fixing device 3 and the blocking device 4 to move. Since the primary oil outlet 105 and the secondary oil outlet 106 are provided in the cylinder housing 101 and the primary piston rod 102, the rotation of the driving disk 203 cannot affect the channels of the primary oil outlet 105 and the secondary oil outlet 106. Therefore, a C-shaped groove 202 is opened, and the rotation of the driving disk 203 will not exceed the limit of the C-shaped groove 202.

[0041] By rotating the disk 205 along Figure 3Rotating in the direction shown can drive the driving block 307 fixedly connected to the rotating disk 205 to contact the plug-in rod 302, driving the plug-in rod 302 to slide in the movable groove 301, so that the plug-in rod 302 is inserted into the fixed groove 303 in the cylinder housing 101. Through this design, the primary piston rod 102 can be effectively fixed in the cylinder housing 101, so that the primary piston rod 102 cannot slide in the cylinder housing 101. When the rotating disk 205 rotates to drive the plug-in rod 302 to insert into the fixed groove 303, the rotating plate 402 will rotate synchronously, connecting and aligning the connecting groove 403 on the rotating plate 402 with the oil port 107 on the primary piston rod 102. At this time, the primary piston rod 102 can be fixed and the secondary piston rod 103 can be driven to slide upward.

[0042] A limiting groove 304 is provided in the primary piston rod 102, and the limiting groove 304 is connected to the movable groove 301. A limiting plate 305 is slidably connected in the limiting groove 304, and the limiting plate 305 is fixedly connected to one side of the plug-in rod 302. The limiting plate 305 is elastically connected to the limiting groove 304 through a limiting spring 306. The design of the limiting groove 304 and the limiting plate 305 can ensure that the plug-in rod 302 does not slide excessively until it is separated from the movable groove 301. At the same time, the design of the limiting spring 306 ensures that the plug-in rod 302 can be reset when there is no interference drive from the driving block 307, and at the same time ensures that the sliding of the primary piston rod 102 is not restricted by the plug-in rod 302. A bottom ring 207 is fixedly connected in the piston housing 101. The design of the bottom ring 207 limits the lowest point of the primary piston rod 102, effectively ensuring the accurate positioning of the plug-in rod 302 and the fixed groove 303.

[0043] A positioning groove 404 is also provided in the first-stage piston rod 102, and the positioning groove 404 is communicated with the mounting groove 401. A positioning ring 405 is rotatably connected in the positioning groove 404, and one end of the positioning ring 405 is fixedly connected to the rotating plate 402, and the outer wall of the positioning ring 405 is fixedly connected to the inner wall of the rotating disk 205. A sealing ring 408 is fixedly connected to one side of the rotating plate 402, and the sealing ring 408 is located in the mounting groove 401.

[0044] One side of the positioning ring 405 is fixedly connected to a limiting ring block 407 , which is rotatably connected in a limiting ring groove 406 . The limiting ring groove 406 is provided at the first-stage piston rod 102 at the positioning groove 404 , and the limiting ring groove 406 is communicated with the positioning groove 404 .

[0045] When the rotating disk 205 rotates, the rotating plate 402 fixedly connected thereto is driven to rotate through the positioning ring 405. The rotation of the rotating plate 402 aligns and interlaces the connecting groove 403 provided on the rotating plate 402 with the oil port 107 in the primary piston rod 102, so as to control whether the hydraulic oil in the cylinder housing 101 passes through the oil port 107, thereby driving the secondary piston rod 103.

[0046] When the hydraulic cylinder is in the initial state, the plug-in rod 302 is not inserted into the fixed groove 303, and the connecting groove 403 in the rotating plate 402 is aligned with the oil port 107. At this time, the hydraulic cylinder is filled with oil, and the first-stage piston rod 102 and the second-stage piston rod 103 can be extended in sequence, which can effectively ensure the normal use of the multi-stage cylinder.

[0047] When the rotating disk 205 rotates clockwise by a certain angle, the driving block 307 on the outer wall of the rotating disk 205 will contact the plug-in rod 302, driving the plug-in rod 302 to be inserted into the fixing groove 303. At this time, the primary piston rod 102 is fixed in the cylinder housing 101 and cannot slide. At the same time, the positioning ring 405 fixedly connected to the inner wall of the rotating disk 205 drives the rotation of the rotating plate 402. Through the rotation of the rotating plate 402, the oil port 107 is connected with the connecting groove 403. At this time, filling the hydraulic cylinder with oil will only drive the secondary piston rod 103 to slide.

[0048] When the rotating disk 205 rotates counterclockwise by a certain angle, the driving block 307 on the outer wall of the rotating disk 205 will not rotate to the position of contacting the plug-in rod 302. At this time, the primary piston rod 102 can still slide in the cylinder housing 101. At this time, the rotating plate 402 will block the oil port 107. At this time, filling the hydraulic cylinder with oil will only drive the primary piston rod 102 to slide in the cylinder housing 101.

[0049] Through the design of the above process, the user can freely control the piston rod that needs to be extended, so that when the direction or size of the load carried by the multi-stage cylinder changes, the piston with a smaller diameter cannot bear the larger load, and a piston with a larger diameter needs to be used to bear this load.

[0050] Embodiment 2: This embodiment is intended to promote the solution of the problem that the seal and the No. 1 piston rod have a large friction during the rotation of the rotating plate. This embodiment is an explanation based on Embodiment 1. For details, please refer to Figure 1-10 ,

[0051] A lifting sealing device 5 for sealing the oil passage 107 is provided in the rotating plate 402, and the lifting sealing device 5 includes a lifting groove 501, and the lifting groove 501 is opened on the surface of the rotating plate 402. A sealing member 502 is slidably connected in the lifting groove 501, and a sliding wedge 503 is fixedly connected to one side of the sealing member 502. The sliding wedge 503 passes through and is slidably connected in the rotating plate 402. A driving wedge 504 is provided at one end of the sliding wedge 503, and a driving connecting rod 505 is fixedly connected to one end of the driving wedge 504. The driving connecting rod 505 passes through the rotating plate 402, and the other end of the driving connecting rod 505 is fixedly connected to a driving slider 506.

[0052] The driving slider 506 is slidably connected in the driving groove 507, and the driving groove 507 is provided on the ring block 508. The ring block 508 is fixedly connected to the primary piston rod 102 at the positioning groove 404. A No. 1 convex groove 509 is also provided in the ring block 508, and the No. 1 convex groove 509 is connected to the driving groove 507.

[0053] One side of the sliding wedge block 503 is fixedly connected to a reset connecting plate 510 , one side of the reset connecting plate 510 is fixedly connected to a reset spring 511 , and the other end of the reset spring 511 is fixedly connected to the reset connecting plate 510 on the other side.

[0054] When the rotating plate 402 rotates, the driving connecting rod 505 disposed in the rotating plate 402 drives the driving wedge 504 to rotate, so that the driving slider 506 at one end of the driving connecting rod 505 slides in the driving slide groove 507. Figure 6 As shown, the arrow direction in the figure is the sliding direction of the driving slider 506, and the driving slider 506 indicated by the dotted line is the maximum sliding position of the driving slider 506).

[0055] When the rotating plate 402 is in a rotating state, the driving slider 506 slides in the driving slide groove 507. At this time, the seal 502 will not fit tightly in the first-stage piston rod 102 under the drive of the lifting sealing device 5. Through this design, it can effectively ensure that when switching the multi-stage cylinder working mode, the seal 502 will not have excessive friction, which will cause the service life of the seal 502 to be reduced.

[0056] When the rotating plate 402 stops rotating, the driving slider 506 is in the first convex groove 509. At this time, the driving slider 506 will produce a lateral displacement due to the change of the track groove, and then drive the driving wedge 504 to produce a lateral displacement through the driving connecting rod 505. This displacement can drive the sliding wedge 503 to slide upward, and then drive the sealing member 502 fixedly connected to the sliding wedge 503 to slide upward, so that when the rotating plate 402 stops rotating, the sealing member 502 is tightly attached to the two sides of the primary piston rod 102 located in the installation groove 401. The design of the connecting plate 510 and the return spring 511 can effectively ensure that the seal 502 is located in the lifting groove 501 when the driving slider 506 does not have lateral displacement, thereby reducing the friction between the seal 502 and the primary piston rod 102. Through this design, it can effectively ensure that when the rotating plate 402 stops rotating, the seal 502 is tightly fitted into the primary piston rod 102 to ensure the sealing of the oil port 107, effectively preventing the hydraulic oil from entering the installation groove 401 through the oil port 107, thereby avoiding oil leakage.

[0057] A sliding assembly 6 is arranged between the sliding wedge block 503 and the driving wedge block 504, and the sliding assembly 6 includes a sliding groove 601, and the sliding groove 601 is opened on the sliding wedge block 503. A sliding block 602 is slidably connected in the sliding groove 601, and the sliding block 602 is fixedly connected to the driving wedge block 504. An anti-slip block 604 is fixedly connected to one side of the sliding block 602, and the anti-slip block 604 is slidably connected to the anti-slip groove 603. The anti-slip groove 603 is opened on the sliding wedge block 503, and the anti-slip groove 603 is communicated with the sliding groove 601.

[0058] The design of the sliding assembly 6 effectively ensures the connection between the sliding wedge 503 and the driving wedge 504, preventing the sliding wedge 503 and the driving wedge 504 from being separated due to unexpected situations such as movement, resulting in the two being unable to contact each other normally, causing the seal 502 to be unable to seal the oil port 107 and causing oil leakage.

[0059] Embodiment 3: This embodiment is intended to promote the solution of the problem of ensuring the sealing of the oil hole during the lifting process of the lifting seal. This embodiment is an explanation based on Embodiment 2. For details, please refer to Figure 1-10 ,

[0060] A secondary sealing assembly 7 is provided in the primary piston rod 102, and the secondary sealing assembly 7 includes a connecting groove 701, which is provided in the primary piston rod 102 and communicated with the oil passage 107. A sliding sealing plate 702 is slidably connected in the connecting groove 701, a sealing slider 703 is fixedly connected to one side of the sliding sealing plate 702, and the other end of the sealing slider 703 is slidably connected in a sealing drive groove 704, which is provided on the sealing member 502, and a No. 2 convex groove 705 is also provided in the sealing drive groove 704, and the sealing slider 703 is slidably connected in a swinging groove 706, which is provided in the primary piston rod 102, and communicated with the connecting groove 701.

[0061] In order to further ensure the sealing performance of the oil passage 107, during the rotation of the rotating plate 402, the sealing slide block 703 is driven to slide through the sealing driving groove 704 on the sealing member 502. Fig.10 As shown in the figure, the direction of the arrow is the sliding direction of the sealing slider 703, and the dotted sealing slider 703 is the maximum sliding position of the sealing slider 703), so that when the sealing slider 703 slides to a certain position, it will drive the sealing slider 703 to drive the sliding sealing plate 702 to move left in the connecting groove 701, thereby realizing the blocking of the oil port 107. Since the connection between the oil port 107 and the connecting groove 403 needs to be ensured when the rotating plate 402 rotates forward, the second convex groove 705 is designed only at one place, which can effectively ensure that the oil port 107 is blocked by the sliding sealing plate 702 when the rotating plate 402 rotates counterclockwise, thereby further ensuring the sealing of the internal parts.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic cylinder assembly with high sealing performance, comprising a multi-stage cylinder (1), Features: The multi-stage oil cylinder (1) comprises an oil cylinder housing (101), a first-stage piston rod (102) is slidably connected inside the oil cylinder housing (101), a second-stage piston rod (103) is slidably connected inside the first-stage piston rod (102), an oil inlet (104) and a first-stage oil outlet (105) are provided on one side of the oil cylinder housing (101), the first-stage oil outlet (105) is connected to a second-stage oil outlet (106), the second-stage oil outlet (106) is provided inside the first-stage piston rod (102), and an oil passage (107) is provided inside the first-stage piston rod (102); A fixing device (3) for limiting the sliding of the primary piston rod (102) is arranged in the primary piston rod (102), the fixing device (3) comprising a movable groove (301), the movable groove (301) being arranged in the primary piston rod (102), a plug-in rod (302) being slidably connected in the movable groove (301), a fixing groove (303) being arranged at one end of the plug-in rod (302), the fixing groove (303) being arranged in the cylinder housing (101), the plug-in of the plug-in rod (302) being driven by a driving block (307), the driving block (307) being mounted on the rotary driving device (2); A blocking device (4) for blocking the oil passage (107) is arranged in the primary piston rod (102), the blocking device (4) comprising a mounting groove (401) provided in the primary piston rod (102), a rotating plate (402) being rotatably connected in the mounting groove (401), two connecting grooves (403) being arranged in the rotating plate (402), and the connecting grooves (403) being eccentrically arranged on the rotating plate (402); The rotary drive device (2) comprises a rotary groove (201) and a C-shaped groove (202) provided at the top of the primary piston rod (102); the rotary groove (201) is in communication with the C-shaped groove (202); a driving disk (203) is rotatably connected in the rotary groove (201); a connecting rod (204) is fixedly connected to one side of the driving disk (203); the connecting rod (204) is rotatably connected in the C-shaped groove (202); a rotating disk (205) is fixedly connected to the other end of the connecting rod (204); the rotating disk (205) is rotatably connected in an empty groove (206); the empty groove (206) is provided in the primary piston rod (102); the driving block (307) is fixedly connected to one side of the rotating disk (205); and the blocking device (4) is installed on the other side of the rotating disk (205); A limiting groove (304) is provided in the primary piston rod (102), the limiting groove (304) is communicated with the movable groove (301), a limiting plate (305) is slidably connected in the limiting groove (304), the limiting plate (305) is fixedly connected to one side of the plug rod (302), and the limiting plate (305) is elastically connected to the limiting groove (304) via a limiting spring (306); A positioning groove (404) is also provided in the primary piston rod (102), the positioning groove (404) being in communication with the mounting groove (401), a positioning ring (405) being rotatably connected in the positioning groove (404), one end of the positioning ring (405) being fixedly connected to the rotating plate (402), an outer side wall of the positioning ring (405) being fixedly connected to the inner wall of the rotating disk (205), a sealing ring (408) being fixedly connected to one side of the rotating plate (402), and the sealing ring (408) being located in the mounting groove (401); A limiting ring block (407) is fixedly connected to one side of the positioning ring (405); the limiting ring block (407) is rotatably connected in a limiting ring groove (406); the limiting ring groove (406) is provided on the first-stage piston rod (102) at the location of the positioning groove (404); the limiting ring groove (406) is communicated with the positioning groove (404); When the multi-stage oil cylinder (1) is in an initial state, the plug-in rod (302) is not inserted into the fixing groove (303), and the connecting groove (403) in the rotating plate (402) is aligned with the oil passage (107), the multi-stage oil cylinder (1) is filled with oil, and the first-stage piston rod (102) and the second-stage piston rod (103) can be extended in sequence; When the rotating disk (205) rotates clockwise by a certain angle, the driving block (307) on the outer wall of the rotating disk (205) will contact the plug rod (302), driving the plug rod (302) to be inserted into the fixing groove (303). At this time, the primary piston rod (102) is fixed in the oil cylinder housing (101) and cannot slide. At the same time, the positioning ring (405) fixedly connected to the inner wall of the rotating disk (205) drives the rotating plate (402) to rotate. Through the rotation of the rotating plate (402), the oil port (107) is connected to the connecting groove (403). At this time, oil is injected into the multi-stage oil cylinder (1), which will only drive the secondary piston rod (103) to slide. When the rotating disk (205) rotates counterclockwise by a certain angle, the driving block (307) on the outer wall of the rotating disk (205) will not rotate to a position that abuts against the plug-in rod (302). At this time, the primary piston rod (102) can still slide in the oil cylinder housing (101). At this time, the rotating plate (402) will block the oil port (107). At this time, when the multi-stage oil cylinder (1) is filled with oil, only the primary piston rod (102) will be driven to slide in the oil cylinder housing (101).

2. A hydraulic cylinder assembly with high sealing performance according to claim 1, Features: A lifting seal device (5) for sealing the oil passage (107) is arranged in the rotating plate (402), the lifting seal device (5) comprising a lifting groove (501), the lifting groove (501) being arranged on the surface of the rotating plate (402), a sealing member (502) being slidably connected in the lifting groove (501), a sliding wedge (503) being fixedly connected to one side of the sealing member (502), the sliding wedge (503) passing through and slidably connected in the rotating plate (402), a driving wedge (504) being arranged at one end of the sliding wedge (503), a driving connecting rod (505) being fixedly connected to one end of the driving wedge (504), the driving connecting rod (505) passing through the rotating plate (402), and a driving slider (506) being fixedly connected to the other end of the driving connecting rod (505); The driving slider (506) is slidably connected in the driving slide groove (507), the driving slide groove (507) is provided on the ring block (508), the ring block (508) is fixedly connected to the first-stage piston rod (102) at the positioning groove (404), and a first convex groove (509) is further provided in the ring block (508), and the first convex groove (509) is communicated with the driving slide groove (507); When the rotating plate (402) stops rotating, the driving slider (506) is in the first convex groove (509), and the driving slider (506) is laterally displaced, thereby driving the driving wedge (504) to be laterally displaced through the driving connecting rod (505). The lateral displacement can drive the sliding wedge (503) to slide upward, thereby driving the sealing member (502) fixedly connected to the sliding wedge (503) to slide upward.

3. A hydraulic cylinder assembly with high sealing performance according to claim 2, Features: A sliding assembly (6) is provided between the sliding wedge block (503) and the driving wedge block (504), and the sliding assembly (6) comprises a sliding groove (601), wherein the sliding groove (601) is provided on the sliding wedge block (503), a sliding block (602) is slidably connected in the sliding groove (601), the sliding block (602) is fixedly connected to the driving wedge block (504), an anti-slip block (604) is fixedly connected to one side of the sliding block (602), the anti-slip block (604) is slidably connected to the anti-slip groove (603), the anti-slip groove (603) is provided on the sliding wedge block (503), and the anti-slip groove (603) is communicated with the sliding groove (601).

4. A hydraulic cylinder assembly with high sealing performance according to claim 3, Features: A secondary sealing assembly (7) is provided in the primary piston rod (102), the secondary sealing assembly (7) comprising a connecting groove (701), the connecting groove (701) being provided in the primary piston rod (102), the connecting groove (701) being communicated with the oil passage (107), a sliding sealing plate (702) being slidably connected in the connecting groove (701), a sealing slider (703) being fixedly connected to one side of the sliding sealing plate (702), the other end of the sealing slider (703) being slidably connected in a sealing driving groove (704), the sealing driving groove (704) being provided on the sealing member (502), a second convex groove (705) being further provided in the sealing driving groove (704), the sealing slider (703) being slidably connected in a swinging groove (706), the swinging groove (706) being provided in the primary piston rod (102), and the swinging groove (706) being communicated with the connecting groove (701); During the rotation of the rotating plate (402), the sealing driving groove (704) on the sealing member (502) drives the sealing slider (703) to slide. Due to the second convex groove (705) in the sealing driving groove (704), when the sealing slider (703) slides to a certain position, the sealing slider (703) drives the sliding sealing plate (702) to move to the left in the connecting groove (701), thereby achieving the blocking of the oil passage (107).

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