Oil cylinder buffer device and oil cylinder

Abstract

The invention relates to the technical field of hydraulic oil cylinders, in particular to an oil cylinder buffering device and an oil cylinder. According to the technical scheme, the device comprises a base fixed to the peripheral side of the cylinder bottom, moving cavities are formed in the two sides of the base, a cover is fixed to the tops of the moving cavities and comprises moving holes, moving blocks are slidably installed in the moving cavities, and a plurality of steel balls located in the moving cavities are arranged below the moving blocks; and the lower portion of the moving cavity communicates with a moving groove and a through groove which are formed in the base, the moving groove communicates with the through groove through a movable groove, and one side of the through groove communicates with an auxiliary flow dividing channel located in the base. The oil enters the auxiliary flow dividing channel to be discharged, the effects of oil flow dividing, liquid outlet pressure reduction and pressure relief are achieved, it is guaranteed that impact force and vibration are gradually reduced in the middle and later periods of the stroke of the piston, and the overall safety is improved.

Description

Technical Field

[0001] The present invention and the technical field of hydraulic cylinders particularly relate to an oil cylinder buffer device and an oil cylinder. Background Art

[0002] In many industrial applications, hydraulic cylinders are widely used as actuators. A common problem with hydraulic cylinders is that when the piston approaches the end of the stroke, it is easy to generate a large impact force due to the high speed, resulting in mechanical vibration and noise, and even damage to the equipment. Therefore, a buffer device is set at the bottom of the hydraulic cylinder.

[0003] The existing buffering device is to open an oil diversion channel around the bottom of the cylinder and install a sleeve at the bottom of the piston. When the piston moves to the end of the stroke, the sleeve will block the main oil return port, so that the oil can only return through the diversion channel, thereby reducing the amount of oil return to achieve a buffering effect. However, this method often causes excessive oil pressure on the bottom of the cylinder at the end of the piston stroke, which is easy to cause danger. Summary of the invention

[0004] The purpose of the present invention is to provide an oil cylinder buffer device and an oil cylinder in view of the problems existing in the background technology.

[0005] The technical solution of the present invention is as follows: a cylinder buffer device and an oil cylinder, comprising a piston, a base fixed on the peripheral side of the cylinder bottom, a moving cavity is provided on both sides of the base, a cover body is fixed on the top of the moving cavity, the cover body comprises a moving hole, a moving block is slidably installed in the moving cavity, a plurality of steel balls located in the moving cavity are arranged below the moving block, a moving groove and a through groove arranged in the base are connected below the moving cavity, the moving groove and the through groove are connected through a movable groove, one side of the through groove is connected with a secondary shunt channel located in the base, a shunt column is arranged in the through groove, a pushing seat is arranged in the moving groove, a connecting plate penetrating the movable groove is fixedly connected between the shunt column and the pushing seat, the connecting plate and the movable groove wall are slidably connected, an oil inlet is provided inside the shunt column, the shunt column is an oil inlet cavity connected to the oil inlet, an extension of the oil inlet cavity is slidably connected in the secondary shunt channel, a top cover is fixed on the other end of the shunt column, a sealing sleeve is arranged around the top cover, the piston comprises a piston sealing ring, a trigger rod that can pass through the moving hole is fixedly installed on both sides of the piston, and movement of the trigger rod will push the shunt column to move.

[0006] Preferably, an oil port is opened at the bottom of the cylinder, and oil channels are connected on both sides of the oil port. The oil channels are provided with diverter valves, and main diverter channels connected to the oil channels are opened on both sides of the bottom of the cylinder. The secondary diverter channel and the oil channel are connected through a connecting channel, and a first check valve is provided at the secondary diverter channel. A sealing sleeve is provided on the peripheral side of the top cover.

[0007] Preferably, a buffer seat is fixedly installed at the bottom of the piston sealing ring, L-shaped diversion channels are provided on both sides of the buffer seat, a sleeve is fixed at the bottom of the buffer seat, a movable moving cylinder is provided in the sleeve, the middle part of the buffer seat is a buffer cavity, the oil inlet end of the L-shaped diversion channel is located in the buffer cavity, and the oil outlet end is located in the oil cylinder, a spring is fixedly installed in the buffer cavity and is located on the same horizontal line as the moving cylinder, and a support column is fixedly installed in the oil port and is located on the same horizontal line as the moving cylinder.

[0008] Preferably, sleeve oil ports are opened on both sides of the sleeve, and moving cylinder oil ports are opened on both sides of the moving cylinder. The contraction length of the spring is consistent with the length of the support column entering the sleeve, and the distance from the moving cylinder oil port to the sleeve oil port is consistent with the length of the support column entering the sleeve.

[0009] Preferably, sliding bearings are fixedly installed at both ends of the sleeve, the moving cylinder and the inner wall of the sliding bearing are fixedly connected, and a second check valve is installed at the oil outlet end of the L-shaped diversion channel.

[0010] Preferably, a plugging groove is provided at the top of the oil port, a plug matching the plugging groove is fixedly mounted on the peripheral side of the sleeve, and a storage area matching the buffer seat is provided on the base.

[0011] An oil cylinder comprises a cylinder body for installing the buffer device.

[0012] Compared with the existing technology, the beneficial effects of the present invention are as follows: this scheme arranges a base at the bottom of the cylinder and installs a trigger rod on the periphery of the piston. When in use, when the piston moves to the bottom of the cylinder to return oil, the trigger rod will be inserted into the moving hole, the trigger rod will press the moving block, the moving block will push a number of steel balls to move, so that the steel balls will enter the moving groove and push the pushing seat to move, the pushing seat will drive the diverter column out of the through groove, so that the top cover and the oil inlet are in the cylinder, so that the oil enters the oil inlet cavity through the oil inlet, and finally the oil enters the secondary diverter channel for discharge, which plays a role in diverting the oil, reducing the pressure of the outlet liquid, and having a pressure relief effect, ensuring that the piston gradually reduces the impact force and vibration in the middle and late stages of the stroke, and improving the overall safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0015] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0016] Figure 4 It is a schematic diagram of the side cross-sectional structure of the base of the present invention;

[0017] Figure 5 It is a structural schematic diagram of the buffer seat of the present invention;

[0018] Figure 6 It is a structural schematic diagram of the storage area of ​​the present invention;

[0019] Figure 7 It is a schematic diagram of the cross-sectional structure of the sleeve and the moving cylinder of the present invention.

[0020] Figure numerals: 1, cylinder body; 2, piston; 3, piston seal ring; 4, trigger rod; 5, base; 6, first check valve; 7, connecting channel; 8, diverter valve; 9, oil port; 10, main diverter channel; 11, oil channel; 51, moving chamber; 52, cover body; 53, moving block; 54, steel ball; 55, moving groove; 56, through groove; 57, diverter column; 58, push seat; 59, auxiliary diverter channel; 521, moving hole; 571, top cover; 5 72. Oil inlet; 573. Oil inlet chamber; 574. Movable groove; 575. Connecting plate; 100. Buffer seat; 101. Buffer chamber; 102. Spring; 103. L-shaped diversion channel; 200. Sleeve; 201. Sleeve oil port; 202. Sliding bearing; 300. Moving cylinder; 301. Moving cylinder oil port; 400. Support column; 500. Storage area; 600. Plug; 700. Plug groove; 800. Second check valve; 900. Sealing sleeve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See attached Figure 1-Figure 7A cylinder buffer device and a cylinder, comprising a piston 2, a base 5 fixed to the circumference of the cylinder bottom, a moving cavity 51 is opened on both sides of the base 5, a cover body 52 is fixed on the top of the moving cavity 51, the cover body 52 includes a moving hole 521, a moving block 53 is slidably installed in the moving cavity 51, a plurality of steel balls 54 located in the moving cavity 51 are arranged below the moving block 53, a moving groove 55 and a through groove 56 opened in the base 5 are connected below the moving cavity 51, the moving groove 55 and the through groove 56 are connected through a movable groove 574, one side of the through groove 56 is connected to a secondary diversion channel 59 located in the base 5, a diversion column 57 is arranged in the through groove 56, and a diversion column 57 is arranged in the moving groove 55. A pushing seat 58 is provided, and a connecting plate 575 penetrating the movable groove 574 is fixedly connected between the diverter column 57 and the pushing seat 58. The connecting plate 575 and the wall of the movable groove 574 are slidably connected. An oil inlet 572 is provided inside the diverter column 57. The diverter column 57 has an oil inlet chamber 573 connected to the oil inlet 572. The extension of the oil inlet chamber 573 is slidably connected in the auxiliary diverter channel 59. A top cover 571 is fixed to the other end of the diverter column 57. A sealing sleeve 900 is provided on the periphery of the top cover 571. The piston 2 includes a piston sealing ring 3. A trigger rod 4 that can pass through the movable hole 521 is fixedly installed on both sides of the piston 2. Movement of the trigger rod 4 will push the diverter column 57 to move.

[0023] When the piston 2 moves to the bottom of the cylinder to return oil, the trigger rod 4 will be inserted into the moving hole 521, the trigger rod 4 will press the moving block 53, and the moving block 53 will push a number of steel balls 54 to move, so that the steel balls 54 will enter the moving groove 55 to push the pushing seat 58 to move, and the pushing seat 58 will drive the diverter column 57 to come out of the through groove 56, so that the top cover 571 and the oil inlet 572 are in the cylinder, so that the oil enters the oil inlet chamber 573 through the oil inlet 572, and finally the oil enters the auxiliary diverter channel 59 for discharge, which plays the role of diverting the oil, reducing the pressure of the outflowing liquid, and having a pressure relief effect, ensuring that the piston can gradually reduce the impact force and vibration in the middle and late stages of the stroke, thereby improving the overall safety, and by the way that the trigger rod 4 enters to push the moving block 53, the moving force of the piston 2 can also be converted into the mechanical force coming out of the diverter column 57, which has a certain buffering effect.

[0024] In this embodiment, an oil port 9 is opened at the bottom of the cylinder, and oil passages 11 are connected on both sides of the oil port 9. The oil passages 11 are provided with diverter valves 8. Main diverter passages 10 connected to the oil passages 11 are opened on both sides of the bottom of the cylinder. The secondary diverter passage 59 and the oil passage 11 are connected through a connecting passage 7. A first check valve 6 is provided at the secondary diverter passage 59, and a sealing sleeve 900 is provided on the peripheral side of the top cover 571.

[0025] When the piston 2 moves to the bottom of the cylinder to return oil, the oil port 9 is the main oil return channel. The oil flowing through the oil port 9 is discharged through the oil channel 11. When the trigger rod 4 is inserted into the moving hole 521, the oil will enter the secondary diversion channel 59, and finally flow into the oil channel 11 through the connecting channel 7. The diversion valve 8 plays a role in controlling the liquid flow.

[0026] When the piston 2 moves toward the top of the cylinder, oil enters the cylinder through the oil passage 11 and the oil port 9 to lift the piston 2. At this time, the trigger rod 4 is driven out of the moving hole 521 through the piston 2, and the moving block 53 loses the driving force. At this time, the first check valve 6 closes the secondary bypass channel 59, and the oil will only enter the cylinder. Under the impact force when the oil continues to enter, it will continuously push the top cover 571, so that the top cover 571 enters the through groove 56 again under the action of this driving force. When the top cover 571 enters, the sealing sleeve 900 has a sealing effect, and the entry of the top cover 571 will push the diverter column 57 to move in the opposite direction, so that the diverter column 57 drives the push seat 58 to move in the opposite direction, thereby pushing the seat 58 to reversely lift the steel ball 54, so that the moving block 53 returns to its position, thus preparing for the next oil return.

[0027] It should be noted that in the traditional oil return method, when the piston 2 moves to the bottom of the cylinder, the oil begins to return through the oil port 9 due to the pressure, and the main diversion channel 10 plays the role of diverting the oil. When the piston 2 continues to move downward to the end of the stroke, the oil port 9 will be blocked, so that the oil is only returned through the main diversion channel 10, thereby reducing the amount of returned oil and playing a buffering effect. However, if this method is used alone, it will cause excessive oil pressure and long-term operation will be dangerous;

[0028] Therefore, in this solution, when the piston 2 moves to the bottom of the cylinder, when the piston 2 has not completely moved to the end of the stroke, the oil is still returned in a traditional way to achieve a buffering effect. When the piston 2 moves to the end of the stroke, the trigger rod 4 enters the moving hole 521 to push the diverter column 57 out, so that the oil enters the oil inlet 572, and the oil path of the secondary diverter channel 59 is opened, which has the effect of diverting the oil, thereby reducing the oil pressure at the end of the stroke, and because of its opening method and time, it will not cause an excessive reduction in the buffering force.

[0029] It should also be noted that if Figure 1As shown, a buffer seat 100 is fixedly installed at the bottom of the piston seal ring 3, and L-shaped shunt channels 103 are arranged on both sides of the buffer seat 100. A sleeve 200 is fixedly installed at the bottom of the buffer seat 100, and a movable moving cylinder 300 is arranged in the sleeve 200. The middle part of the buffer seat 100 is a buffer cavity 101. The oil inlet end of the L-shaped shunt channel 103 is located in the buffer cavity 101, and the oil outlet end is located in the oil cylinder. A spring 102 located on the same horizontal line as the moving cylinder 300 is fixedly installed in the buffer cavity 101, and a spring 102 located on the same horizontal line as the moving cylinder 300 is fixedly installed in the oil port 9. A support column 400 is installed on the same horizontal line as the moving cylinder 300, sleeve oil ports 201 are opened on both sides of the sleeve 200, and moving cylinder oil ports 301 are opened on both sides of the moving cylinder 300. The contraction length of the spring 102 is consistent with the length of the support column 400 entering into the sleeve 200, and the distance from the moving cylinder oil port 301 to the sleeve oil port 201 is consistent with the length of the support column 400 entering into the sleeve 200, so that when the moving cylinder 300 moves, the moving cylinder oil port 301 will coincide with the sleeve oil port 201.

[0030] In addition, sliding bearings 202 are fixedly installed at both ends of the sleeve 200 , the moving cylinder 300 is fixedly connected to the inner wall of the sliding bearing 202 , and a second check valve 800 is installed at the oil outlet end of the L-shaped diversion channel 103 .

[0031] In this embodiment, when the piston 2 moves to the bottom of the cylinder to return oil, it will drive the buffer seat 100 to move. When it moves to the end of the stroke, the sleeve 200 will be inserted into the oil port 9, and the support column 400 will enter the sleeve 200 to push the moving cylinder 300 to move it, so that the moving cylinder 300 will squeeze the spring 102 to contract. At this time, when the support column 400 completely enters the sleeve 200, the moving cylinder oil port 301 will move to the sleeve oil port 201 and overlap with it, so that an oil hole is formed in the sleeve oil port 201, the moving cylinder oil port 301 and the moving cylinder 300. The oil path is connected to the buffer chamber 101, thereby pushing the piston 2 to move, so that the oil enters the moving cylinder 300 through the sleeve oil port 201 and is discharged into the buffer chamber 101. Finally, the oil enters the L-shaped shunt channel 103 for discharge. The oil enters the L-shaped shunt channel 103 under high pressure, and the oil discharged from the L-shaped shunt channel 103 also has high pressure. The high-pressure oil discharged from the L-shaped shunt channel 103 goes to the bottom of the cylinder, thereby forming a reaction force to push the piston 2, which has a buffering effect.

[0032] When oil is introduced, the piston 2 will drive the buffer seat 100 to move, so that the support column 400 will no longer play the role of pushing the movable cylinder 300. At this time, the spring 102 will rebound, so that the movable cylinder 300 is pushed completely into the sleeve 200 and returns to its original position. When oil is introduced, the second check valve 800 will be closed to prevent oil from entering the L-shaped diversion channel 103.

[0033] Furthermore, a plugging groove 700 is formed at the top of the oil port 9 , a plug 600 matching the plugging groove 700 is fixedly mounted on the peripheral side of the sleeve 200 , and a receiving area 500 matching the buffer seat 100 is formed at the base 5 .

[0034] When the sleeve 200 moves into the oil port 9, the plug 600 will enter the blocking groove 700 to block the oil port 9, and the oil will be diverted back from the blocking groove 700 and the auxiliary diversion channel 59, thereby achieving a buffering effect. When the piston 2 is fully moved into place, the buffer seat 100 will be located in the storage area 500, and the piston 2 will be located on the top of the base 5. This reasonable design allows the piston 2 to be stable in the cylinder.

[0035] In addition, the present invention also discloses an oil cylinder, comprising the above-mentioned oil cylinder buffer device, and also comprising a cylinder body 1 for installing the buffer device.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cylinder buffer device, comprising a piston (2), characterized in that: A base (5) is fixed on the circumferential side of the bottom of the cylinder, and a moving cavity (51) is provided on both sides of the base (5). A cover (52) is fixed on the top of the moving cavity (51), and the cover (52) includes a moving hole (521). A moving block (53) is slidably installed in the moving cavity (51), and a plurality of steel balls (54) located in the moving cavity (51) are provided below the moving block (53). A moving groove (55) and a through groove (56) provided in the base (5) are connected below the moving cavity (51). The moving groove (55) and the through groove (56) are connected via a movable groove (574). One side of the through groove (56) is connected to a secondary flow diversion channel (59) located in the base (5). A flow diversion column (57) is provided in the through groove (56), and a push seat (58) is provided in the moving groove (55). A connecting plate (575) penetrating the movable groove (574) is fixedly connected between the diverter column (57) and the push seat (58); the connecting plate (575) and the wall of the movable groove (574) are slidably connected; an oil inlet (572) is provided inside the diverter column (57); an oil inlet chamber (573) connected to the oil inlet (572) is provided inside the diverter column (57); an extension of the oil inlet chamber (573) is slidably connected in the auxiliary diverter channel (59); a top cover (571) is fixedly provided at the other end of the diverter column (57); a sealing sleeve (900) is provided around the top cover (571); the piston (2) includes a piston sealing ring (3); trigger rods (4) that can pass through the movable hole (521) are fixedly installed on both sides of the piston (2); movement of the trigger rod (4) will push the diverter column (57) to move.

2. The oil cylinder buffer device according to claim 1, characterized in that: The bottom of the cylinder is provided with an oil port (9), both sides of the oil port (9) are connected to oil passages (11), the oil passages (11) are provided with diverter valves (8), both sides of the bottom of the cylinder are provided with main diverter passages (10) connected to the oil passages (11), the secondary diverter passages (59) and the oil passages (11) are connected via a connecting passage (7), a first check valve (6) is provided at the secondary diverter passage (59), and a sealing sleeve (900) is provided on the peripheral side of the top cover (571).

3. The oil cylinder buffer device according to claim 2, characterized in that: A buffer seat (100) is fixedly installed at the bottom of the piston sealing ring (3), and L-shaped flow-diverting channels (103) are arranged on both sides of the buffer seat (100). A sleeve (200) is fixedly installed at the bottom of the buffer seat (100), and a movable moving cylinder (300) is arranged in the sleeve (200). The middle part of the buffer seat (100) is a buffer cavity (101), and the oil inlet end of the L-shaped flow-diverting channel (103) is located in the buffer cavity (101), and the oil outlet end is located in the oil cylinder. A spring (102) located on the same horizontal line as the moving cylinder (300) is fixedly installed in the buffer cavity (101), and a support column (400) located on the same horizontal line as the moving cylinder (300) is fixedly installed in the oil port (9).

4. The oil cylinder buffer device according to claim 3, characterized in that: Sleeve oil ports (201) are provided on both sides of the sleeve (200), and moving cylinder oil ports (301) are provided on both sides of the moving cylinder (300). The contraction length of the spring (102) is consistent with the length of the support column (400) entering into the sleeve (200), and the distance from the moving cylinder oil port (301) to the sleeve oil port (201) is consistent with the length of the support column (400) entering into the sleeve (200).

5. The oil cylinder buffer device according to claim 4, characterized in that: Sliding bearings (202) are fixedly installed at both ends of the sleeve (200), the moving cylinder (300) and the inner wall of the sliding bearing (202) are fixedly connected, and a second check valve (800) is installed at the oil outlet end of the L-shaped diversion channel (103).

6. The oil cylinder buffer device according to claim 3, characterized in that: The top of the oil port (9) is provided with a plugging groove (700), the peripheral side of the sleeve (200) is fixedly mounted with a plug (600) adapted to the plugging groove (700), and the base (5) is provided with a storage area (500) adapted to the buffer seat (100).

7. An oil cylinder, characterized in that: It comprises an oil cylinder buffer device as described in any one of claims 1 to 6, and also comprises a cylinder body (1) for mounting the buffer device.

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