A leakage prevention device for hydraulic cylinder

Abstract

The present invention discloses a leakage prevention device for a hydraulic cylinder, which relates to the technical field of hydraulic cylinders, comprising: a hydraulic cylinder unit, the hydraulic cylinder unit comprising an intermediate cylinder, the interior of the intermediate cylinder being movably connected with a piston, and further comprising: a buffer chamber 1 and a buffer chamber 2 are symmetrically arranged on the upper and lower sides of the intermediate cylinder for buffering the piston and the hydraulic oil; the intermediate cylinder is closed and sealed by a closed scraper 1 and a closed scraper 2, which are used to receive the piston falling on the surface thereof, and the elastic member on the side of the ring plate buffers the movement of the piston, and then the closed scraper 1 and the closed scraper 2 are unfolded, so that the scraper 1 and the scraper 2 move in opposite directions and are clamped on the piston surface, and the oil port 1 or the oil port 2 between the ring plate and the intermediate cylinder is injected with hydraulic oil to push the ring plate, the closed scraper 1 and the closed scraper 2 to move, so that the scraper 1 and the scraper 2 perform a unidirectional scraping on the piston away from the intermediate cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic oil cylinders, and in particular to a leakage prevention device for a hydraulic oil cylinder. Background Art

[0002] As the actuator in the high-pressure and high-flow hydraulic system, the hydraulic cylinder can convert hydraulic energy into mechanical energy. The leakage of the hydraulic cylinder will affect its performance. The leakage of hydraulic cylinders is generally divided into two categories: one is external leakage: the hydraulic oil leaks directly from the cylinder seal to the external environment; the other is internal leakage: the oil flows abnormally from the high-pressure chamber to the low-pressure chamber inside the cylinder, which cannot be directly observed, resulting in insufficient output of the hydraulic cylinder and reduced efficiency.

[0003] Chinese patent CN114109960B discloses a leak-proof hollow plunger hydraulic oil cylinder, including a cylinder barrel, a drive motor, an oil bin, a dust removal bin, a flushing mechanism, and a hollow plunger. A drive motor is fixed to one side of the cylinder barrel, and the output shaft is arranged on the top of the drive motor. A hollow plunger is slidably connected to the inside of the cylinder barrel, and an oil bin is welded to the top of the cylinder barrel. The hollow plunger is connected through the middle of the oil bin, a dust removal bin is fixed to the top of the oil bin, the hollow plunger is connected through the middle of the dust removal bin, and a flushing mechanism is connected to the top of the dust removal bin. In most cases, dust and other debris adsorbed by the plunger during operation will reduce the lubricating effect of the oil film, and as the machine movement frequency increases and the operating cycle lengthens, the adsorbed dust accelerates the wear and fatigue of the sealing system, causing the plunger cylinder to easily leak after frequent operation for a period of time. Therefore, a leak-proof hollow plunger hydraulic oil cylinder is proposed here.

[0004] The above patents and prior art have the following problems:

[0005] Existing technologies usually intervene in external leakage, but in the event of oil circuit failure or dirt entering the cylinder from the external environment, it will cause attachments to form on the surface of the seal on the piston surface, which will increase the wear of the piston surface seal and the inner wall of the cylinder. Long-term operation will cause the seal to wear and fail, especially in places with poor working environments. Therefore, how to solve the internal and external leakage of the hydraulic cylinder and reduce the wear problem caused by the backflow of attachments on the piston surface into the cylinder body is a problem that needs to be solved for the development of the industry. Summary of the Invention

[0006] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A leakage prevention device for a hydraulic cylinder comprises: a hydraulic cylinder unit, the hydraulic cylinder unit comprising an intermediate cylinder, a piston movably connected to the interior of the intermediate cylinder, and further comprising:

[0009] The upper and lower sides of the intermediate cylinder are symmetrically provided with a buffer chamber 1 and a buffer chamber 2 for buffering the piston and the hydraulic oil;

[0010] An anti-overflow unit is provided inside the buffer chamber 1 and the buffer chamber 2;

[0011] The anti-overflow unit includes a ring plate, the interior of which accommodates closed scraper 1 and closed scraper 2 moving in opposite directions through an active cavity, and the outer sides of closed scraper 1 and closed scraper 2 are provided with a pushing driving member for pushing closed scraper 1 and closed scraper 2 to move, and closed scraper 1 and closed scraper 2 are closed and sealed to receive a piston falling on its surface, and the elastic member on the side of the ring plate cushions the movement of the piston, and then the closed scraper 1 and closed scraper 2 are unfolded, so that the scraping mouth 1 and scraping mouth 2 move in opposite directions and are engaged with the piston surface, and hydraulic oil is injected into the oil port 1 or the oil port 2 between the ring plate and the intermediate cylinder body to push the ring plate, closed scraper 1 and closed scraper 2 to move, so that the scraping mouth 1 and scraping mouth 2 scrape the piston away from the intermediate cylinder body in one direction.

[0012] As a preferred solution of the anti-leakage device for the hydraulic cylinder of the present invention, the top of the piston is fixedly connected to a piston rod.

[0013] The buffer chamber 1 is conductively connected to the buffer chamber 2 through the intermediate cylinder body, and the inner diameters of the buffer chamber 1 and the buffer chamber 2 are larger than the inner diameter of the intermediate cylinder body.

[0014] As a preferred embodiment of the anti-leakage device for the hydraulic cylinder of the present invention, the top of the buffer chamber 1 is provided with a through opening with a sealing member disposed therein, and the through opening is movably connected to the piston rod through the sealing member;

[0015] A clamping piece is installed on the top of the buffer chamber 1. The cross section of the clamping piece is conical. The clamping piece is in movably contact with the piston rod through the rubber layer in the top opening.

[0016] As a preferred solution of the anti-leakage device for the hydraulic cylinder of the present invention, the side of the buffer chamber 1 is connected to the oil port 1, the side of the top of the buffer chamber 1 is symmetrically provided with a flushing port 1 and an installation chamber 1, and a pushing drive member is installed inside the installation chamber 1.

[0017] As a preferred solution of the anti-leakage device for the hydraulic cylinder of the present invention, the side of the buffer chamber 2 is provided with an oil port 2, the bottom of the buffer chamber 2 is symmetrically provided with a flushing port 2 and an installation chamber 2, and a pushing drive member is installed inside the installation chamber 2.

[0018] As a preferred solution of the anti-leakage device for the hydraulic cylinder of the present invention, wherein:

[0019] The ring plate further comprises a circular opening formed in the middle thereof, wherein the diameter of the circular opening is larger than the diameter of the piston;

[0020] An active cavity communicating with the circular opening is provided inside the ring plate, and inner walls of the first buffer cavity and the second buffer cavity are fixedly connected to the ring plate via an elastic member.

[0021] As a preferred solution of the anti-leakage device for the hydraulic cylinder of the present invention, the interior of the movable chamber is movably connected with a closed scraper 1 and a closed scraper 2 in an upper and lower staggered manner, and the surfaces of the closed scraper 1 and the closed scraper 2 are both wrapped with a rubber layer.

[0022] As a preferred solution of the leakage prevention device for the hydraulic cylinder described in the present invention, the shapes of the scraper 1 and the scraper 2 are both semicircular, the projection of the scraper 1 and the scraper 2 on the surface of the ring plate after relative movement and contact is circular, and the diameter of the circle matches the diameter of the piston, and the inner sides of the scraper 1 and the scraper 2 are provided with a rubber layer along their contours.

[0023] As a preferred solution of the anti-leakage device for the hydraulic cylinder of the present invention, the bottom of the closing scraper one is provided with a closing strip one, and the top of the closing scraper two is provided with a closing strip two, and the closing strip one and the closing strip two are respectively fixedly connected to the inner wall of the movable cavity.

[0024] As a preferred solution of the anti-leakage device for the hydraulic cylinder of the present invention, wherein: a movable groove is provided at the bottom of the movable chamber;

[0025] The output shaft of the push driving member is fixedly connected with a telescopic rod, the top of the telescopic rod passes through a movable slot and is fixedly connected with the closed scraper 1 and the closed scraper 2 respectively, and a roller is installed at the bottom of the telescopic rod.

[0026] Beneficial effects of the present invention:

[0027] By arranging the buffer chamber 1 and the buffer chamber 2 on the upper and lower sides of the intermediate cylinder body, the pressure inside the intermediate cylinder body is buffered, and the closing movement of the ring plate, the closed scraper 1 and the closed scraper 2 is coordinated to buffer the movement of the piston, thereby improving the life of the piston. In combination with the relative positions of the oil ports 1 and 2 inside the buffer chamber 1 and the buffer chamber 2 relative to the closed scraper 1 and the closed scraper 2 on their sides, and the relative movement of the closed scraper 1 and the closed scraper 2, the piston surface sealing ring is scraped in one direction, so that the scraped attachments are washed out of the buffer chamber 1 and the buffer chamber 2 inside, avoiding the attachments on the piston surface from entering the interior of the intermediate cylinder body, causing internal leakage caused by long-term movement and wear between the piston sealing ring and the intermediate cylinder body, thereby resulting in poor sealing effect and insufficient driving force between the upper and lower pistons. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, wherein:

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure connection of the present invention;

[0031] Figure 3 This is a schematic diagram of the internal structure connection of the buffer chamber of the present invention;

[0032] Figure 4 This is a schematic diagram of the internal structure connection of the buffer chamber 2 of the present invention;

[0033] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part A;

[0034] Figure 6 for Figure 4 Schematic diagram of the enlarged structure of part B;

[0035] Figure 7 Schematic diagram comparing the interior of buffer chamber 1 and the interior of buffer chamber 2 of the present invention;

[0036] Figure 8 This is a schematic diagram of the internal structure connection of the ring plate of the present invention;

[0037] Figure 9 This is a schematic diagram of the closed connection between the first and second closed scrapers of the present invention;

[0038] Figure 10 This is a schematic diagram of the contact connection between the closed scraper 1 and the closed scraper 2 and the piston of the present invention.

[0039] In the picture:

[0040] 1. Hydraulic cylinder unit; 101. Intermediate cylinder; 102. Buffer chamber 1; 1021. Oil port 1; 1022. Flushing port 1; 1023. Mounting chamber 1; 1024. Clamp; 1025. Seal; 103. Buffer chamber 2; 1031. Oil port 2; 1032. Flushing port 2; 1033. Mounting chamber 2; 104. Piston rod; 1041. Piston;

[0041] 2. Anti-overflow unit; 201. Ring plate; 2011. Round mouth; 2012. Movable cavity; 2013. Elastic member; 2014. Movable groove; 202. Enclosing scraper 1; 2021. Enclosing strip 1; 2022. Scraping mouth 1; 203. Enclosing scraper 2; 2031. Enclosing strip 2; 2032. Scraping mouth 2; 204. Push drive member; 205. Telescopic rod; 2051. Roller. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] Example 1: Figures 1-10 As shown, 1. A leakage prevention device for a hydraulic cylinder, comprising: a hydraulic cylinder unit 1, the hydraulic cylinder unit 1 comprising an intermediate cylinder 101, wherein the interior of the intermediate cylinder 101 is movably connected to a piston 1041, and further comprising:

[0044] The upper and lower sides of the intermediate cylinder 101 are symmetrically provided with a buffer chamber 102 and a buffer chamber 2 103 for buffering the piston 1041 and the hydraulic oil;

[0045] An anti-overflow unit 2 is provided inside the buffer chamber 1 102 and the buffer chamber 2 103;

[0046] The anti-overflow unit 2 includes a ring plate 201, the interior of which accommodates a closed scraper 1 202 and a closed scraper 2 203 that move in opposite directions through an active cavity 2012. The outer sides of the closed scraper 1 202 and the closed scraper 2 203 are provided with a driving member 204 for pushing the closed scraper 1 202 and the closed scraper 2 203 to move. The closed scraper 1 202 and the closed scraper 2 203 are closed and sealed to receive the piston 1041 that falls on its surface, and to make the elastic member 2013 on the side of the ring plate 201 press the piston 1041 against the piston 1041. Move for buffering, then unfold the closed scraper 1 202 and the closed scraper 2 203, so that the scraper mouth 1 2022 and the scraper mouth 2 2032 move towards each other and are engaged with the surface of the piston 1041, and inject hydraulic oil into the oil port 1021 or the oil port 2 1031 between the ring plate 201 and the intermediate cylinder body 101 to push the ring plate 201, the closed scraper 1 202 and the closed scraper 2 203 to move, so that the scraper mouth 1 2022 and the scraper mouth 2 2032 perform a one-way scraping on the piston 1041 away from the intermediate cylinder body 101, and the elastic member 2013 is preferably a spring.

[0047] like Figure 1-Figure 2 As shown, the top of the piston 1041 is fixedly connected to the piston rod 104, and the piston 1041 is connected to a sealing ring through the upper and lower grooves on its surface;

[0048] The buffer chamber 1 102 is conductively connected to the buffer chamber 2 103 via the intermediate cylinder 101 . The inner diameters of the buffer chamber 102 and the buffer chamber 2 103 are larger than the inner diameter of the intermediate cylinder 101 .

[0049] like Figure 1-Figure 3 As shown, the top of the buffer chamber 102 is provided with an opening in which a sealing member 1025 is disposed. The opening is movably connected to the piston rod 104 via the sealing member 1025. The sealing member 1025 is preferably composed of a guide support ring, a lip seal ring, and a dust ring.

[0050] A clamping piece 1024 is installed on the top of the buffer chamber 102. The cross section of the clamping piece 1024 is conical. The clamping piece 1024 is in movable contact with the piston rod 104 through the rubber layer in the top opening.

[0051] like Figure 1-Figure 3 and Figure 7 As shown, the side of the buffer chamber 102 is connected to the oil port 1021, and the side of the top of the buffer chamber 102 is symmetrically provided with a flushing port 1022 and an installation chamber 1023. The interior of the installation chamber 1023 is provided with a push drive 204, the interior of the flushing port 1022 is provided with a filter screen, and an electromagnetic valve is provided between the buffer chamber 102 and the oil port 1021, and the electromagnetic valve is provided between the filter screen and the buffer chamber 102.

[0052] like Figure 1-Figure 2 as well as Figure 4 and Figure 7 As shown, the side of the buffer chamber 2 103 is provided with an oil port 2 1031, and the bottom of the buffer chamber 2 103 is symmetrically provided with a flushing port 2 1032 and an installation chamber 2 1033. A push drive 204 is installed inside the installation chamber 2 1033, and a filter is installed inside the flushing port 2 1032, and a solenoid valve is provided between the filter inside the flushing port 2 1032 and the buffer chamber 1 102. The push drive 204 installed inside the installation chamber 1 1023 and the installation chamber 2 1033 is preferably a cylinder or an electric telescopic cylinder, and the output rod of the push drive 204 passes through the perforation on the inner wall of the buffer chamber 1 102 and the buffer chamber 2 103 and is provided inside the buffer chamber 1 102 and the buffer chamber 2 103, and a sealing ring is installed inside the perforation. Of course, the push drive 204 can also be preferably a micro hydraulic cylinder, and the output shaft of the push drive 204 is pushed back and forth through an external circuit and a hydraulic pump.

[0053] like Figure 3-Figure 4 As shown, the ring plate 201 further includes a circular opening 2011 opened in the middle thereof, and the diameter of the circular opening 2011 is larger than the diameter of the piston 1041;

[0054] The ring plate 201 has an internal active cavity 2012 in communication with the circular opening 2011 . The inner walls of the buffer cavity 1 102 and the buffer cavity 2 103 are fixedly connected to the ring plate 201 via an elastic member 2013 .

[0055] like Figure 4-10 As shown, the interior of the movable cavity 2012 is movably connected with a closed scraper 1 202 and a closed scraper 2 203 in an alternating manner up and down, and the surfaces of the closed scraper 1 202 and the closed scraper 2 203 are both wrapped with a rubber layer.

[0056] like Figure 4-10As shown, the bottom of the closed scraper 1 202 is provided with a closing strip 1 2021, and the top of the closed scraper 2 203 is provided with a closing strip 2031. The closing strip 1 2021 and the closing strip 2 2031 are respectively fixedly connected to the inner wall of the active cavity 2012. The closing strip 1 2021 and the closing strip 2 2031 are preferably sealing strips, wherein the top of the closed scraper 1 202 contacts the inner wall of the active cavity 2012 through the rubber layer on its surface, and the bottom of the closed scraper 1 202 contacts the closing strip 1 2021, so that the closed scraper One 202 is relatively closed relative to the interior of the active chamber 2012. Similarly, the bottom of the closed scraper two 203 contacts the inner wall of the active chamber 2012 through the rubber layer on its surface, and the top of the closed scraper two 203 contacts the closed strip two 2031, so that the closed scraper two 203 is relatively closed relative to the interior of the active chamber 2012, and the closed scraper one 202 is closer to the middle cylinder body 101. When the closed scraper one 202 and the closed scraper two 203 buffer the piston 1041, the closed scraper one 202 first contacts the closed scraper one 202.

[0057] Working principle:

[0058] The hydraulic circuit of the oil cylinder, its oil port 1021 and oil port 2 1031 are respectively connected and controlled by two independent two-position three-way solenoid valves. That is, the P port of the valve, i.e., the oil inlet, receives high-pressure oil from the main oil pipeline and the hydraulic pump, the T port, i.e., the oil return port, is connected to the oil tank, and the A port is connected to the surface of oil port 1021 or oil port 2 1031. The operation logic of the entire system is directed by a PLC controller. The oil inlets of these two valves are respectively connected to a main oil pipeline through pipes, and their respective oil return ports are merged and flowed back to the oil tank. An oil filter is also installed between oil port 1021 and oil port 2 1031 and the main circuit pipeline. The end of the main oil pipeline opposite to the valve is connected to the hydraulic pump outlet, and the hydraulic pump inlet is connected to the oil tank through a pipe. The oil flow of the main oil pipeline is regulated by a throttle valve to control the speed of the piston 1041. A relief valve is also connected in parallel to the main oil pipeline, which is responsible for setting the maximum safety pressure of the entire system.

[0059] The symmetrical flushing ports 1022 are connected to a hydraulic pump driven by a motor through a pipeline, that is, the flushing port 1022 on one side is connected to the oil tank through a pipeline, the oil tank is connected to the liquid inlet of the hydraulic pump through a pipeline, and the flushing port 1022 on the other side is connected to the liquid outlet of the hydraulic pump through a pipeline. Similarly, the symmetrical flushing ports 2 1032 are connected to a hydraulic pump driven by a motor through a pipeline, that is, the flushing port 2 1032 on one side is connected to the oil tank through a pipeline, the oil tank is connected to the liquid inlet of the hydraulic pump through a pipeline, and the flushing port 2 1032 on the other side is connected to the liquid outlet of the hydraulic pump through a pipeline, and the pipelines connecting the hydraulic pump and the flushing ports 1 1022 and 1032 are filled with hydraulic oil, thereby forming a loop between the relative flushing ports 1 1022 and a loop between the relative flushing ports 2 1032.

[0060] When the surface of the piston 1041 does not need to be cleaned, the driving member 204 inside the mounting chamber 2 1033 symmetrically on the surface of the buffer chamber 2 103 and the mounting chamber 1 1023 symmetrically on the surface of the buffer chamber 1 102 pushes the telescopic rod 205 and the roller 2051 to move inside the buffer chamber 1 102 and the buffer chamber 2 103 respectively, so that the telescopic rod 205 drives the closing scraper 2 203 and the closing scraper 1 202 to move in opposite directions along the moving groove 2014 inside the ring plate 201, so that the interior of the circular opening 2011 is overlapped and sealed by the closing scraper 1 202 and the closing scraper 2 203 that overlap and move relative to each other.

[0061] It should be noted that the surfaces of the closed scraper 1 202 and the closed scraper 2 203 are wrapped with a rubber layer, and the closed scraper 1 202 and the closed scraper 2 203 are respectively in contact with the inside of the active cavity 2012 through the rubber layer, and the two are sealed by the rubber layer contact, and the portion of the closed scraper 2 203 located inside the active cavity 2012 corresponds to the sealing strip 2 2031 installed on the top of the active cavity 2012, so that the active cavity 2012 is movably sealed through the sealing strip 2 2031 and the closed scraper 2 203, and the portion of the closed scraper 1 202 located inside the active cavity 2012 corresponds to the sealing strip 2 2031 installed on the top of the active cavity 20 12 is provided with a closing strip 1 2021 at the bottom, so that the movable cavity 2012 can be movably closed by the closing strip 1 2021 and the closing scraper 1 202, and the closing strip 1 2021 and the closing strip 2 2031 are both arranged between the movable groove 2014 and the circular opening 2011 on their corresponding sides, thereby realizing relative closure between the closing scraper 2 203 and the closing scraper 1 202 and the ring plate 201, and the outer side of the ring plate 201 is provided with a sealing ring wrapped around it, so that the ring plates 201 inside the buffer cavity 102 and the buffer cavity 2 103 are movably closed with the buffer cavity 102 and the buffer cavity 2 103 respectively through the sealing ring.

[0062] When the piston 1041 needs to be lifted, the piston 1041 contacts the closed scraper 1 202 and the closed scraper 203 inside the buffer chamber 2 103, so that the oil inlet of the valve external to the oil port 2 1031 is opened and the oil return port is closed, so that the hydraulic pump injects hydraulic oil into the buffer chamber 2 103 through the oil port 2 1031. At this time, the oil return port of the valve external to the oil port 1021 is opened and the oil inlet is closed, so that the subsequent oil port 1031 pushes the piston 1041 to rise, and the hydraulic oil on the front side of the piston 1041 rises returns to the inside of the oil tank through the oil return port of the valve external to the oil port 1021, so that the hydraulic oil inside the buffer chamber 2 103 is The oil pushes the ring plate 201, the closed scraper 1 202 and the closed scraper 2 203 at the bottom of the piston 1041 to descend, so that the hydraulic oil pushes the ring plate 201 to drive the elastic member 2013 to descend. Only when the hydraulic oil compresses the elastic member 2013 to a preset height will there be space between the piston 1041 and the ring plate 201. The design of leaking the bottom space of the piston 1041 by the pre-descent of the elastic member 2013 and the ring plate 201 is one way to prevent the piston 1041 from being clamped or lifted by the rapid lifting of the piston rod 104 caused by the rapid lifting of the oil injection. The lifting of the equipment is unstable, and the hydraulic oil is filled into the interior of the buffer chamber 103 through the oil port 1031, so that the elastic member 2013 and the ring plate 201 are slowly lowered, and the hydraulic oil is slowly filled in the interior of the buffer chamber 103, so that the lifting pressure at the bottom of the piston 1041 is stably established, avoiding the jitter phenomenon caused by unstable pressure when the piston rod 104 is started. Secondly, it is also ensured that through the above design, the piston 1041 can only move when the ring plate 201 is pressed down by pressure, so that a pressure safety locking structure is formed before the piston 1041 is lifted. Only when the ring plate 201 is pressed down, the space between the piston 1041 and the ring plate 201 leaks. After the piston 1041 is squeezed out, there is space for the piston 1041 to be squeezed and lifted. When the ring plate 201 drops, the space at the bottom of the piston 1041 leaks out. At this time, one-third of the piston 1041 is inside the middle cylinder 101, and two-thirds is set inside the second buffer chamber 103. The surfaces of the piston 1041 located inside the middle cylinder 101 and the second buffer chamber 103 are both provided with sealing rings. The piston 1041 will be in contact and sealed with the middle cylinder 101 through the sealing ring located inside the middle cylinder 101. Therefore, when the space at the bottom of the piston 1041 leaks out, the hydraulic oil pushes the bottom of the piston 1041, causing it to lift the piston 1041 along the middle cylinder 101.

[0063] When the piston rod 104 enters the buffer chamber 102, the top of the piston 1041 contacts the closed scraper 203, so that the piston 1041 squeezes the closed scraper 203 and the ring plate 201 inside the buffer chamber 102, so that when the ring plate 201 is squeezed, the elastic member 2013 on its top is also squeezed, so that when the piston rod 104 moves to the buffer chamber 102, the piston 1041 will not directly hit the rigid cylinder body, but will squeeze the closed scraper 203 and the ring plate supported by the elastic member 2013 before the piston rod 104 moves to the buffer chamber 102. 201, so that it can effectively absorb the impact of the piston 1041 when it moves, thereby reducing the impact damage of the piston 1041, and reducing the impact vibration and noise of the piston 1041. When the piston 1041 returns from the buffer chamber 102 to the buffer chamber 2 103, the interior of the oil port 1021 will be injected with hydraulic oil, and the oil port 2 1031 will discharge the hydraulic oil, thereby repeating the above process, so that the piston 1041 descends to the interior of the buffer chamber 2 103 and is buffered by the closed scraper 2 203, the ring plate 201 and the elastic member 2013.

[0064] Buffer chamber 1 102 and buffer chamber 2 103 with larger diameters than the inner diameter of the middle cylinder body 101 are respectively provided above and below the middle cylinder body 101. When the load installed on the piston rod 104 in the oil cylinder changes suddenly, a pressure shock will be generated in the hydraulic pipeline. The enlarged space of buffer chamber 102 and buffer chamber 2 103 will absorb the shock through the enlarged space, making the pressure change inside it smoother, thereby protecting the seal and reducing damage caused by accidental impact, thereby avoiding the phenomenon of external leakage of the oil cylinder caused by pressure shock.

[0065] Example 2: This embodiment is different from the first embodiment in that:

[0066] like Figure 4-10 As shown, the shapes of scraper 1 2022 and scraper 2 2032 are both semicircular. After scraper 1 2022 and scraper 2 2032 move relative to each other and contact, the projections on the surface of the ring plate 201 are circular, and the diameter of the circle matches the diameter of the piston 1041. A rubber layer is provided on the inner side of scraper 1 2022 and scraper 2 2032 along their contours.

[0067] like Figures 1-10 As shown, a movable groove 2014 is provided at the bottom of the movable cavity 2012, and a first closing strip 2021 and a second closing strip 2031 are both provided between the movable groove 2014 and the circular opening 2011;

[0068] The output shaft of the pushing drive member 204 is fixedly connected to a telescopic rod 205, the top of the telescopic rod 205 passes through the movable groove 2014 and is fixedly connected to the closed scraper 1 202 and the closed scraper 2 203 respectively, and a roller 2051 is installed at the bottom of the telescopic rod 205. The telescopic rod 205 is preferably composed of an external sleeve and a straight rod movable inside the sleeve.

[0069] The rest of the structure is the same as that of the first embodiment.

[0070] Operation process:

[0071] When the surface of the piston 1041 needs to be cleaned, the piston 1041 moves to the interior of the buffer chamber 2 103 and is buffered by the closed scraper 2 203, the ring plate 201 and the elastic member 2013. At this time, one-third of the piston 1041 is inside the middle cylinder 101, and two-thirds is set inside the buffer chamber 2 103. The piston 1041 will be in contact and sealed with the middle cylinder 101 through its sealing ring located inside the middle cylinder 101. At this time, the closed scraper 1 202 and the closed scraper 2 203 at the bottom of the piston 1041 are pushed by the driving members 2 on both sides. 04 is pulled, so that the push drive member 204 pulls the telescopic rod 205 outward, thereby releasing the contact between the closed scraper 1 202 and the closed scraper 2 203, so that when the closed scraper 1 202 and the closed scraper 2 203 are withdrawn outward to the preset position inside the movable chamber 2012 along with the telescopic rod 205, the space between the closed scraper 1 202 and the closed scraper 2 203 is larger than the diameter of the piston 1041 and the sealing ring on its surface, so that when the closed scraper 1 202 and the closed scraper 2 203 are withdrawn a distance greater than the piston 1041 and the sealing ring on its surface, the space between the closed scraper 1 202 and the closed scraper 2 203 is larger than the diameter of the piston 1041 and the sealing ring on its surface. When the diameter of the sealing ring is 0.044mm, the closing scraper 1 202 and the closing scraper 2 203 do not contact the sealing ring on the surface of the piston 1041, so that the squeezing of the closing scraper 2 203 by the piston 1041 is released, and the elastic member 2013 compressed by the piston 1041 rebounds, thereby driving the closing scraper 1 202 and the closing scraper 2 203 to rebound to the pre-position, which is set at the bottom of the position where the oil port 2 1031 is located in the buffer chamber 2 103, and in this process, the closing scraper 1 202 and the closing scraper 2 203 do not contact the piston 1041, so that the closing scraper 1 202 and the closing scraper 2 During the upward movement of the closed scraper 203, the attached matter on the surface of the piston 1041 located inside the second buffer chamber 103 will not be scraped onto the top of the ring plate 201, thereby reducing the probability that the attached matter on the surface of the piston 1041 will be scraped to its top and flow into the interior of the intermediate cylinder 101 during the upward movement of the closed scraper 1 202 and the closed scraper 2 203, thereby reducing the probability that the attached matter scraped subsequently will flow into the interior of the intermediate cylinder 101, and reducing the wear of the surface between the piston 1041 and the intermediate cylinder 101 by the attached matter inside the intermediate cylinder 101 when the piston 1041 is located inside the intermediate cylinder 101 and moves.

[0072] After the preset time, the ring plate 201 has been rebounded by the elastic member 2013 to the bottom of the oil port 2 1031, and then the two pushing driving members 204 are started, so that the two pushing driving members 204 push the closing scraper 1 202 and the closing scraper 2 203 to move relative to each other, so that the closing scraper 1 202 and the closing scraper 2 203 are respectively connected to the sealing ring surface of the piston 1041 through the scraper 1 2022 and the scraper 2 2032 combination on their surfaces. At this time, the internal space contour of the combination of scraper 1 2022 and scraper 2 2032 is circular, so that the rubber layer on the surface of scraper 1 2022 and scraper 2 2032 fits and is connected to the sealing ring surface of the piston 1041, so that hydraulic oil is injected into the interior of the oil port 2 1031 through the hydraulic oil pump. At this time, the oil inlet of the valve external to the oil port 2 1031 is opened, the oil return port is closed, and the oil return port of the valve external to the oil port 1021 is opened. The oil inlet is closed, so that the hydraulic oil injected into the oil port 2 1031 pushes the ring plate 201 and the closed scraper 2 203 and the closed scraper 1 202 attached to the outer sealing ring surface of the piston 1041 to move downward, so that the closed scraper 1 202 and the closed scraper 2 203 respectively scrape downward along the surface of the piston 1041 through the scraper 1 2022 and the scraper 2 203, so that the surface of the bottom part of the ring plate 201 of the sealing ring of the piston 1041 after rebound and lifting is cleaned, so that most of the attachments scraped off the surface of the sealing ring of the piston 1041 will be located at the bottom of the ring plate 201, so that the scraper 1 2022 and the scraper 2 2032 complete the one-way scraping of the piston 1041. After the hydraulic oil is injected into the oil port 2 1031 for a preset time, the throttle valve adjusts to slow down the oil injection speed of the oil port 2 1031, so that the closed scraper 1 202 and the closed scraper 2 203 maintain their positions or slowly descend;

[0073] The external solenoid valve of the flushing port 1032 is opened, and the external hydraulic pump injects hydraulic oil into the flushing port 1032 on one side, and the flushing port 1032 on the other side discharges oil, so that the scraping port 1 2022 and the scraping port 2 2032 form a circular structure that is clamped with the outside of the piston 1041, and the attachments that fall from the sealing ring surface of the scraping piston 1041 to the bottom of the ring plate 201 are washed away and filtered by the filter screen inside the flushing port 1032. After the preset flushing time, the solenoid valve installed between the flushing port 1032 and the buffer chamber 103 is closed, thereby completing the scraping and flushing of the piston 1041 at the bottom of the ring plate 201. When the scraping at the bottom of the ring plate 201 is After the attachments on the surface of the movable piston 1041 are cleaned, the closing scraper 1 202 and the closing scraper 2 203 are pulled apart by the driving member 204 and retracted into the interior of the movable chamber 2012, causing the circular port 2011 to leak out, and the space between the piston 1041 and the circular port 2011 to leak out, so that the hydraulic oil injected from the oil port 2 1031 can enter the bottom of the piston 1041 through the space between the circular port 2011 and the piston 1041, thereby pushing the piston 1041 to rise. Of course, when the piston 1041 moves to the interior of the intermediate cylinder 101, the closing scraper 1 202 and the closing scraper 2 203 inside the buffer chamber 102 are overlapped and closed again;

[0074] In order to reduce the downward movement of the piston 1041 when it is not supported by the closed scraper 1 202 and the closed scraper 2 203, the nut on the surface of the piston rod 104 can contact the clamp 1024. After being supported by the clamp 1024, the piston rod 104 and the piston 1041 are lowered and supported by the clamp 1024. Then, the closed scraper 1 202 and the closed scraper 2 203 at the bottom of the piston 1041 are pushed outward by the driving member 204, and then supported by the elastic member 2013 to rise.

[0075] The above process only cleans the bottom surface of the ring plate 201 of the piston 1041 after the rebound and lifting, and the structures inside the buffer chamber 102 and the buffer chamber 2 103 are basically the same. According to the above process, after the piston 1041 enters the buffer chamber 102 and is buffered, the closed scraper 1 202 and the closed scraper 2 203 inside the buffer chamber 102 are pulled back by the push driving member 204, and then rebounded downward by the elastic member 2013. During this process, the scraper 1 2022 and the scraper 2 2032 do not contact the piston 1041. When the closed scraper 1 202 and the closed scraper 2 203 move to the top position of the oil port 1021, the push driving member 204 pushes the closed scraper 1 202 and the closed scraper 2 203 to move in opposite directions, so that the scraper 1 2022 and the scraper 2 2032 are clamped to the sealing ring surface of the piston 1041.

[0076] Then, hydraulic oil is injected into the oil port 1021. At the same time, the oil inlet of the outer valve of the oil port 2 1031 is not closed, and the oil return port is not opened. The hydraulic pump on the outer side slowly supplies oil to the oil port 2 1031 or does not supply oil, thereby maintaining the relative position of the piston 1041 at this time. After all, at this time, one-third of the bottom of the piston 1041 is located inside the middle cylinder body 101, and two-thirds are located inside the buffer chamber 102. Therefore, when the oil injected into the oil port 1021 pushes the closed scraper 1 202 and the closed scraper 2 203 inside the buffer chamber 102 to rise along the piston 1041 for a preset time, the surface sealing ring of the piston 1041 relative to the other part of the buffer chamber 2 103 is scraped and cleaned in one direction, and then the flushing port 1022 on one side is filled with oil, and the flushing port 1022 on the other side is drained, thereby completing the scraping and discharge cleaning of the top part of the piston 1041.

[0077] After the cleaning is completed, the closing scraper 1 202 and the closing scraper 2 203 are moved outward, so that the closing scraper 1 202 and the closing scraper 2 203 vacate the space of the circular port 2011. At this time, the oil inlet of the external valve of the oil port 2 1031 is closed, and the oil return port is opened, so that the hydraulic oil injected into the oil port 1021 enters the top of the piston 1041 at the top of the buffer chamber 102 through the circular port 2011 inside the buffer chamber 102, thereby pushing the piston 1041 downward. When the piston 1041 moves down to the inside of the intermediate cylinder body 101, the closing scraper 1 202 and the closing scraper 2 203 inside the buffer chamber 102 are pushed closed by the corresponding pushing drive member 204, and then through the above process, the surface of the piston 1041 is cleaned, thereby reducing the attachment of the piston 1041 sealing ring and the attachment of the piston 1041, which accelerates the internal leakage problem caused by the wear of the piston 1041 surface sealing ring during the movement of the piston 1041.

[0078] During the up and down movement of the piston 1041, the clamping member 1024 always adheres to the surface of the piston rod 104, thereby scraping the reciprocating surface of the piston rod 104, so that the piston rod 104 extends out of the buffer chamber 102 and then retracts into the buffer chamber 102. The surface is scraped by the clamping member 1024 and the rubber layer of its top opening, preventing the piston rod 104 from carrying its surface attachments into the interior of the buffer chamber 102, thereby causing external leakage caused by wear and failure of the seal 1025.

[0079] In summary, the buffer chamber 102 and the buffer chamber 2 103 are arranged on the upper and lower sides of the intermediate cylinder body 101, thereby buffering the pressure inside the intermediate cylinder body 101, and cooperating with the closing movement of the ring plate 201, the closing scraper 1 202 and the closing scraper 2 203, thereby buffering the movement of the piston 1041, thereby improving the life of the piston 1041, and combining the relative positions of the oil port 1 1021 and the oil port 2 1031 inside the buffer chamber 102 and the buffer chamber 2 103 with respect to the closing scraper 1 202 and the closing scraper 2 203 on their sides, And the relative movement of the closed scraper 1 202 and the closed scraper 2 203, thereby performing one-way scraping on the sealing ring on the surface of the piston 1041, so that the scraped attachments are washed out of the buffer chamber 102 and the buffer chamber 2 103 inside the buffer chamber 102 and the buffer chamber 2 103, avoiding the attachments on the surface of the piston 1041 from entering the interior of the intermediate cylinder body 101, causing internal leakage caused by long-term movement and wear between the sealing ring of the piston 1041 and the intermediate cylinder body 101, thereby resulting in poor sealing effect and insufficient driving force between the upper and lower parts of the piston 1041.

Claims

1. A leakage prevention device for a hydraulic cylinder, comprising: A hydraulic cylinder unit (1) comprising an intermediate cylinder (101), wherein the interior of the intermediate cylinder (101) is movably connected to a piston (1041), and is characterized in that it further comprises: A buffer chamber 1 (102) and a buffer chamber 2 (103) for buffering the piston (1041) and the hydraulic oil are symmetrically provided on the upper and lower sides of the intermediate cylinder body (101); an anti-overflow unit (2) is provided inside the buffer chamber 1 (102) and the buffer chamber 2 (103); The anti-overflow unit (2) includes a ring plate (201), the interior of the ring plate (201) accommodates a closed scraper 1 (202) and a closed scraper 2 (203) that move in opposite directions through an active cavity (2012), and a driving member (204) is provided on the outer sides of the closed scraper 1 (202) and the closed scraper 2 (203) to push the closed scraper 1 (202) and the closed scraper 2 (203) to move, and is used to receive the piston (1041) that falls on its surface by closing the closed scraper 1 (202) and the closed scraper 2 (203), and to make the elastic member (2013) on the side of the ring plate (201) move against the active cavity (2012). The movement of the plug (1041) is buffered, and then the closed scraper 1 (202) and the closed scraper 2 (203) are unfolded, so that the scraper port 1 (2022) and the scraper port 2 (2032) move in opposite directions and are engaged with the surface of the piston (1041), and the oil port 1 (1021) or the oil port 2 (1031) between the ring plate (201) and the intermediate cylinder body (101) is injected with hydraulic oil to push the ring plate (201), the closed scraper 1 (202) and the closed scraper 2 (203) to move, so that the scraper port 1 (2022) and the scraper port 2 (2032) scrape the piston (1041) in a one-way manner away from the intermediate cylinder body (101); The top of the piston (1041) is fixedly connected to a piston rod (104), and the buffer chamber 1 (102) is conductively connected to the buffer chamber 2 (103) via the intermediate cylinder body (101), and the inner diameters of the buffer chamber 1 (102) and the buffer chamber 2 (103) are larger than the inner diameter of the intermediate cylinder body (101); The ring plate (201) further comprises a circular opening (2011) formed in the middle thereof, wherein the diameter of the circular opening (2011) is larger than the diameter of the piston (1041); an active cavity (2012) communicating with the circular opening (2011) is formed inside the ring plate (201); the inner walls of the buffer cavity 1 (102) and the buffer cavity 2 (103) are fixedly connected to the ring plate (201) via an elastic member (2013); The movable cavity (212) has a closed scraper 1 (202) and a closed scraper 2 (203) connected in an upper and lower staggered manner inside, and the surfaces of the closed scraper 1 (202) and the closed scraper 2 (203) are both wrapped with a rubber layer; A movable groove (2014) is provided at the bottom of the movable cavity (2012); the output shaft of the push driving member (204) is fixedly connected to a telescopic rod (205); the top of the telescopic rod (205) passes through the movable groove (2014) and is fixedly connected to the closed scraper 1 (202) and the closed scraper 2 (203), respectively; and a roller (2051) is installed at the bottom of the telescopic rod (205).

2. The anti-leakage device for a hydraulic cylinder according to claim 1, characterized in that: The top of the buffer chamber (102) is provided with a through opening with a sealing member (1025) disposed therein, and the through opening is movably connected to the piston rod (104) via the sealing member (1025); A clamping piece (1024) is installed on the top of the buffer chamber (102). The cross section of the clamping piece (1024) is conical. The clamping piece (1024) is in movable contact with the piston rod (104) through the rubber layer in the top opening.

3. The anti-leakage device for a hydraulic cylinder according to claim 2, characterized in that: The side of the buffer chamber (102) is connected to the oil port (1021), and the top side of the buffer chamber (102) is symmetrically provided with a flushing port (1022) and an installation chamber (1023), and a pushing driving member (204) is installed inside the installation chamber (1023).

4. The anti-leakage device for a hydraulic cylinder according to claim 2, characterized in that: The side of the second buffer chamber (103) is provided with an oil port 2 (1031), the bottom of the second buffer chamber (103) is symmetrically provided with a flushing port 2 (1032) and an installation chamber 2 (1033), and a push driving member (204) is installed inside the installation chamber 2 (1033).

5. The anti-leakage device for a hydraulic cylinder according to claim 4, characterized in that: The scraper 1 (2022) and the scraper 2 (2032) are both semicircular in shape. After the scraper 1 (2022) and the scraper 2 (2032) move relative to each other, their projections on the surface of the ring plate (201) are circular, and the diameter of the circle matches the diameter of the piston (1041). A rubber layer is provided on the inner sides of the scraper 1 (2022) and the scraper 2 (2032) along their contours.

6. The anti-leakage device for a hydraulic cylinder according to claim 5, characterized in that: The bottom of the first closing scraper (202) is provided with a first closing strip (2021), and the top of the second closing scraper (203) is provided with a second closing strip (2031). The first closing strip (2021) and the second closing strip (2031) are respectively fixedly connected to the inner wall of the movable cavity (2012).

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