Hydraulic cylinder with high sealing performance

Abstract

The present application relates to the technical field of hydraulic oil cylinder, in particular to a hydraulic oil cylinder with high sealing performance, which comprises a piston cylinder and a sliding disc slidingly arranged in the piston cylinder, the sliding disc is provided with a piston rod extending out of the piston cylinder at one end, and the piston cylinder is provided with an oil inlet at the end away from the piston cylinder; an annular clamping groove is arranged on the outer wall of the sliding disc, a sealing ring is arranged in the annular clamping groove through an annular clamping piece, a plurality of strip-shaped grooves are arranged on the side of the sliding disc close to the oil inlet in the circumferential direction, and a pressing mechanism for making the sealing ring adhere to the inner wall of the piston cylinder is arranged on the sliding disc. The sealing ring is kept stable through the annular clamping piece, and the sealing ring adheres to the inner wall of the piston cylinder more through the pressing mechanism, so that the sealing effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic oil cylinder, in particular to a hydraulic oil cylinder with high sealing performance. BACKGROUND

[0002] The hydraulic cylinder is a hydraulic execution element which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It is simple in structure and reliable in operation. When it is used to realize reciprocating motion, the reduction device can be omitted, and there is no transmission gap, so the motion is stable, and it is widely used in various mechanical hydraulic systems.

[0003] Among them, the piston type hydraulic cylinder can be divided into single rod type and double rod type. The single rod type hydraulic oil cylinder inputs pressure into one cavity of the oil cylinder, and moves the oil cylinder in one direction by hydraulic pressure. The piston only relies on the sealing ring for sealing. With the input of hydraulic oil, the hydraulic pressure in the oil cylinder increases. At this time, the hydraulic pressure on the sealing ring also gradually increases. Under long-term high pressure, the hydraulic oil may leak, causing "cylinder explosion", thereby affecting production safety. SUMMARY

[0004] The main purpose of the present application is to provide a hydraulic oil cylinder with high sealing performance. The stability of the sealing ring is ensured by the sealing ring and the annular clamping piece. The sealing ring is more closely attached to the inner wall of the piston cylinder by the first arc-shaped pressing plate and the second arc-shaped pressing plate, thereby ensuring the sealing effect.

[0005] To achieve the above purpose, the present application provides a hydraulic oil cylinder with high sealing performance, which comprises a piston cylinder, a sliding disc, a sealing ring and a pressing mechanism. One end of the piston cylinder is provided with an oil inlet, and the end of the piston cylinder away from the oil inlet is provided with a guide hole. The sliding disc is slidingly arranged in the piston cylinder. The piston rod is arranged at the end of the sliding disc center away from the oil inlet and slidingly arranged in the guide hole. The outer wall of the sliding disc is provided with an annular clamping groove, and the inner wall of the sealing ring is provided with an annular clamping piece. The annular clamping piece is arranged in the annular clamping groove, and the sealing ring is located between the inner wall of the piston cylinder and the outer wall of the sliding disc. The side of the sliding disc close to the oil inlet is provided with a plurality of strip-shaped grooves in the circumferential direction, and the pressing mechanism is arranged on the sliding disc and used to make the sealing ring closely attached to the inner wall of the piston cylinder. The pressing mechanism comprises a plurality of moving strips slidingly arranged in the corresponding strip-shaped grooves. One end of each moving strip close to the axis of the sliding disc is connected with the end of the corresponding strip-shaped groove through a pressing spring, and the other end of each moving strip away from the axis of the sliding disc is provided with a first arc-shaped pressing plate. The two ends of the side of each first arc-shaped pressing plate away from the moving strip are provided with arc-shaped guide grooves, and the second arc-shaped pressing plate is slidingly arranged in each arc-shaped guide groove. The edge of the side of the sliding disc close to the oil inlet is provided with an annular accommodating groove for accommodating the first arc-shaped pressing plate and the second arc-shaped pressing plate.

[0006] Preferably, the inner wall of the sealing ring is further provided with an arc-shaped connecting cover, the arc-shaped connecting cover is integrally formed with the sealing ring, the sealing ring is made of soft silica gel material, and the arc-shaped connecting cover is made of hard rubber material.

[0007] Preferably, a sliding hole is arranged at the center of the side of the sliding disc close to the oil inlet, a connecting rod is slidably arranged in the sliding hole, a buffer spring is arranged between the connecting rod and the inner wall of the bottom of the sliding hole, and an arc-shaped supporting plate is arranged at the end of the connecting rod away from the sliding hole.

[0008] Preferably, two guide grooves are arranged in the inner wall of the sliding hole in a mirror image, guide blocks are arranged on the outer wall of the connecting rod in a mirror image, the guide blocks are slidably arranged in the corresponding guide grooves, an annular groove is arranged at the center of the side of the sliding disc close to the sliding hole, and a limiting ring is arranged in the annular groove.

[0009] Preferably, a plurality of vertical grooves corresponding to the strip-shaped grooves are arranged on the side of the sliding disc close to the oil inlet in a circumferential direction, a right-angled trapezoidal block is slidably arranged in each vertical groove, an extension plate extending into the inside of the corresponding vertical groove is arranged at the end of each moving strip away from the corresponding first arc-shaped pressing plate, and a triangular clamping block cooperating with the right-angled trapezoidal block is arranged on the extension plate.

[0010] Preferably, a reset spring is further sleeved on the piston rod.

[0011] Preferably, a guide spring is further arranged in each arc-shaped guide groove.

[0012] The beneficial effects of the present application compared with the prior art are:

[0013] 1. The first arc-shaped pressing plate and the second arc-shaped pressing plate cooperate to enable the sealing ring to self-adaptively fit the inner wall of the piston cylinder, thereby ensuring the sealing effect.

[0014] 2. The arc-shaped connecting cover and the arc-shaped supporting plate cooperate, the arc-shaped connecting cover can not only avoid the overflow of hydraulic oil through the imaginary accommodating grooves at the edge of the sliding disc, but also the arc-shaped connecting cover made of hard rubber material can be deformed under the pressure of the hydraulic oil, so that the edge of the arc-shaped connecting cover can perform secondary extrusion on the edge of the sealing ring, thereby further improving the sealing effect of the sealing ring.

[0015] 3. The right-angled trapezoidal blocks arranged in the vertical grooves can enable the plurality of first arc-shaped pressing plates to move synchronously toward the sealing ring during the movement of the arc-shaped supporting plate, and the extrusion force of the first arc-shaped pressing plate and the second arc-shaped pressing plate on the sealing ring can be increased correspondingly according to the different internal pressures of the piston cylinder, thereby ensuring the sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated herein by reference. The illustrations are of illustrative embodiments of the application and are not intended to limit the application in any way. In the drawings:

[0017] Figure 1 is a perspective view of the present application;

[0018] Figure 2 is a front view of the present application;

[0019] Figure 3 is Figure 2 a sectional view along the plane A-A;

[0020] Figure 4 is Figure 3 a partial enlarged view at B in the middle;

[0021] Figure 5 is a partial perspective view of the present application;

[0022] Figure 6 is Figure 5 a partial enlarged view at C in the middle;

[0023] Figure 7 is a partial perspective exploded view of the present application Figure 1 ;

[0024] Figure 8 is a partial perspective exploded view of the present application Figure 2 ;

[0025] Figure 9 is Figure 8 a partial enlarged view at D in the middle.

[0026] The reference signs in the above figures are:

[0027] 1 - piston cylinder; 11 - oil inlet; 12 - guide hole;

[0028] 2 - sliding disc; 21 - piston rod; 211 - return spring; 22 - annular clamping groove; 23 - strip-shaped groove; 24 - annular accommodating groove; 25 - sliding hole; 251 - guide groove; 26 - connecting rod; 261 - arc-shaped support plate; 262 - guide block; 27 - buffer spring; 28 - annular groove; 281 - limiting ring; 29 - vertical groove; 291 - right-angled trapezoidal block;

[0029] 3 - sealing ring; 31 - annular clamping member; 32 - arc-shaped connecting cover;

[0030] 4 - compression mechanism; 41 - moving bar; 411 - extension plate; 412 - triangular clamping block; 42 - compression spring; 43 - first arc-shaped pressing plate; 431 - arc-shaped guide slot; 432 - guide spring; 44 - second arc-shaped pressing plate. DETAILED DESCRIPTION

[0031] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0032] Reference Figures 1 to 9 As shown in the figure, a hydraulic cylinder with high sealing performance, comprising a piston cylinder 1, a sliding disc 2, a sealing ring 3 and a compression mechanism 4; the piston cylinder 1 is provided with an oil inlet 11 at one end, and a guide hole 12 is provided at the end of the piston cylinder 1 away from the oil inlet 11; the sliding disc 2 is slidingly arranged inside the piston cylinder 1, and a piston rod 21 is provided at the end of the sliding disc 2 center away from the oil inlet 11, and the piston rod 21 is slidingly arranged in the guide hole 12; the outer wall of the sliding disc 2 is provided with an annular clamping groove 22, and the inner wall of the sealing ring 3 is provided with an annular clamping piece 31, the annular clamping piece 31 is arranged in the annular clamping groove 22, and the sealing ring 3 is located between the inner wall of the piston cylinder 1 and the outer wall of the sliding disc 2; a plurality of strip-shaped grooves 23 are circumferentially arranged on the side of the sliding disc 2 close to the oil inlet 11, and the compression mechanism 4 is arranged on the sliding disc 2 and used for making the sealing ring 3 fit the inner wall of the piston cylinder 1; the compression mechanism 4 comprises a plurality of moving bars 41 slidingly arranged in the corresponding strip-shaped grooves 23; one end of each moving bar 41 close to the axis of the sliding disc 2 is connected with the end of the corresponding strip-shaped groove 23 through a compression spring 42, and the other end of each moving bar 41 away from the axis of the sliding disc 2 is provided with a first arc-shaped pressing plate 43, and two ends of the side of each first arc-shaped pressing plate 43 away from the moving bar 41 are provided with arc-shaped guide slots 431, and a second arc-shaped pressing plate 44 is slidingly arranged in each arc-shaped guide slot 431, and the edge of the side of the sliding disc 2 close to the oil inlet 11 is provided with an annular accommodating groove 24 for accommodating the first arc-shaped pressing plate 43 and the second arc-shaped pressing plate 44.

[0033] The worker injects hydraulic oil into the piston cylinder 1 through the oil injection port 11, at this time, the hydraulic oil is located between the sliding disc 2 and the oil injection port 11, thereby pushing the sliding disc 2 to move, the annular clamping piece 31 is integrally formed with the sealing ring 3, the sealing ring 3 is connected with the sliding disc 2 through the annular clamping piece 31, which can prevent the sealing ring 3 from being displaced or shaken during use, and ensure that it can remain stable; the second arc-shaped pressing plate 44 is close to the adjacent second arc-shaped pressing plate 44, at this time, the plurality of first arc-shaped pressing plates 43 and the plurality of second arc-shaped pressing plates 44 form a “compression ring” that can tightly adhere to the sealing ring 3, during the movement of the sliding disc 2, the “compression ring” can adaptively adhere to the inner wall of the piston cylinder 1 under the elastic force of the compression spring, thereby ensuring that the “compression ring” can always adhere to the inner wall of the piston cylinder 1, and ensuring the sealing effect.

[0034] Referring to Figure 4 As shown in the figure, the inner wall of the sealing ring 3 is also provided with an arc-shaped connecting cover 32, the arc-shaped connecting cover 32 is integrally formed with the sealing ring 3, the sealing ring 3 is made of soft silicone material, and the arc-shaped connecting cover 32 is made of hard rubber material.

[0035] In order to further ensure the sealing effect between the sliding disc 2 and the piston cylinder 1, and avoid leakage of hydraulic oil from the annular accommodating groove 24; thereby setting the arc-shaped connecting cover 32 on the inner wall of the sealing ring 3, the arc-shaped connecting cover 32 is integrally formed with the sealing ring 3, the sealing ring 3 is made of soft silicone material, and the arc-shaped connecting cover 32 is made of hard rubber material; the cross section of the arc-shaped connecting cover 32 is arc-shaped, at this time, the arc-shaped connecting cover 32, the sealing ring 3 and the side of the sliding disc 2 close to the oil injection port 11 form a cavity, the first arc-shaped pressing plate 43 and the second arc-shaped pressing plate 44 are located inside the cavity, thereby avoiding leakage of hydraulic oil from the annular accommodating groove 24; and when the pressure in the piston cylinder 1 increases, the hydraulic oil can extrude the arc-shaped connecting cover 32, at this time, the extruded arc-shaped connecting cover 32 can deform, thereby enabling the edge of the arc-shaped connecting cover 32 to extrude the edge of the sealing ring 3 again, thereby further improving the sealing effect of the sealing ring 3.

[0036] Referring to Figures 4 to 9 As shown in the figure, the side of the sliding disc 2 close to the oil injection port 11 is provided with a sliding hole 25 at the center, the sliding hole 25 is slidably provided with a connecting rod 26, a buffer spring 27 is arranged between the connecting rod 26 and the inner wall of the bottom of the sliding hole 25, and the end of the connecting rod 26 away from the sliding hole 25 is provided with an arc-shaped supporting plate 261.

[0037] In order to avoid excessive deformation of the arc-shaped connecting cover 32, causing the connecting position of the arc-shaped connecting cover 32 and the sealing ring 3 to fall off; the arc-shaped support plate 261 provided on the connecting rod 26 is in close contact with the arc-shaped connecting cover 32 under the elastic force of the buffer spring 27, thereby supporting the arc-shaped connecting cover 32, which not only avoids excessive deformation of the arc-shaped connecting cover 32, but also guides the deformation position of the arc-shaped connecting cover 32, further improving the fit of the sealing ring 3 and the piston cylinder 1.

[0038] As shown in Figures 8 to 9 The inner wall of the sliding hole 25 is mirror-imaged provided with two guide grooves 251, and the outer wall of the connecting rod 26 is mirror-imaged provided with a guide block 262, which can be slidably arranged in the corresponding guide groove 251. The sliding disc 2 is provided with an annular groove 28 at the center of the side close to the sliding hole 25, and a limiting ring 281 is arranged in the annular groove 28.

[0039] By providing the guide block 262 and the guide groove 251, the stability of the movement of the connecting rod 26 can be ensured, and by providing the limiting ring 281, the position of the connecting rod 26 can be limited to prevent it from falling out of the sliding hole 25.

[0040] As shown in Figure 4 and Figure 7 The sliding disc 2 is provided with a plurality of vertical grooves 29 corresponding to the strip-shaped grooves 23 on the side close to the oil inlet 11. A right-angled trapezoidal block 291 is slidably arranged in each vertical groove 29. An extension plate 411 extending into the corresponding vertical groove 29 is arranged at one end of each moving strip 41 away from the corresponding first arc-shaped pressing plate 43. A triangular clamping block 412 cooperating with the right-angled trapezoidal block 291 is arranged on the extension plate 411.

[0041] As the pressure in the piston cylinder 1 increases, the arc-shaped support plate 261 moves with the movement of the arc-shaped connecting cover 32. The arc-shaped support plate 261 can contact the corresponding plurality of right-angled trapezoidal blocks 291. The inclined surface of the right-angled trapezoidal block 291 can be in abutment with the inclined surface of the corresponding triangular clamping block 412. With the movement of the arc-shaped support plate 261, the right-angled trapezoidal block 291 can move along the corresponding vertical groove 29. Through the extension plate 411, the plurality of first arc-shaped pressing plates 43 can be more closely fitted with the sealing ring 3, thereby further improving the sealing effect of the sealing ring 3.

[0042] As shown in Figure 3 The piston rod 21 is further sleeved with a reset spring 211.

[0043] By providing the reset spring 211, the reset spring 211 is located in the corresponding piston cylinder 1, thereby facilitating the quick reset of the piston rod 21.

[0044] As shown inFigure 7 As shown, a guide spring 432 is further arranged in each arc-shaped guide slot 431.

[0045] By arranging the guide spring 432, when the first arc-shaped pressing plate 43 moves, the second arc-shaped pressing plate 44 can always move away from the first arc-shaped pressing plate 43, thereby being attached to the adjacent second arc-shaped pressing plate 44, ensuring that the sealing ring 3 can be pressed in the circumferential direction, and ensuring the sealing effect.

[0046] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A hydraulic cylinder with high sealing performance, characterized in that: The piston cylinder, the sliding disc, the sealing ring and the pressing mechanism are included. The piston cylinder is provided with an oil inlet at one end and a sliding hole at the other end away from the oil inlet. The sliding disc is provided with an annular clamping groove on the outer wall, and the sealing ring is provided with an annular clamping piece on the inner wall. The sliding disc is provided with a plurality of strip-shaped grooves on the side close to the oil inlet. The pressing mechanism is arranged on the sliding disc and is used to make the sealing ring fit the inner wall of the piston cylinder. The pressing mechanism includes a plurality of moving strips slidingly arranged in the corresponding strip-shaped grooves. Each moving strip is connected to the end of the corresponding strip-shaped groove through a pressing spring at the end close to the axis of the sliding disc.

2. The hydraulic cylinder with high sealing performance according to claim 1, characterized in that, Each first arc-shaped pressing plate is provided with an arc-shaped guide groove at the two ends away from the moving strip.

3. The hydraulic cylinder with high sealing performance according to claim 1, characterized in that, Each arc-shaped guide groove is slidingly provided with a second arc-shaped pressing plate.

4. The hydraulic cylinder with high sealing performance according to claim 1, characterized in that, The sliding disc is provided with an annular accommodating groove at the edge of the side close to the oil inlet for accommodating the first arc-shaped pressing plate and the second arc-shaped pressing plate. The sealing ring is made of soft silicone material, and the arc-shaped connecting cover is made of hard rubber material. The sliding disc is provided with a sliding hole at the center of the side close to the oil inlet. The connecting rod is slidingly arranged in the sliding hole. The connecting rod is provided with a buffer spring between the connecting rod and the inner wall of the bottom of the sliding hole. The connecting rod is provided with an arc-shaped support plate at the end away from the sliding hole. The sliding disc is provided with a plurality of vertical grooves corresponding to the strip-shaped grooves on the side close to the oil inlet. Each vertical groove is slidingly provided with a right-angled trapezoidal block. Each moving strip is provided with an extension plate extending into the corresponding vertical groove at the end away from the corresponding first arc-shaped pressing plate. The extension plate is provided with a triangular clamping block matched with the right-angled trapezoidal block. The inner wall of the sliding hole is provided with two guide grooves in mirror image. The outer wall of the connecting rod is provided with guide blocks in mirror image. The guide blocks are slidingly arranged in the corresponding guide grooves. The piston rod is further provided with a reset spring. Each arc-shaped guide groove is further provided with a guide spring.

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