Hydraulic oil cylinder capable of preventing bottom collision

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a bottom-collision-preventing hydraulic oil cylinder which comprises a cylinder barrel, a buffer spring arranged on the surface of a piston, a fixed clamping plate fixed on the surface of the piston, a sliding rail arranged on the surface of the piston, a sliding block connected in the sliding rail in a sliding mode, a movable clamping plate fixed on the surface of the sliding block, and a movable clamping plate fixed on the surface of the movable clamping plate. The fixed clamping plate and the movable clamping plate are movably connected to the surfaces of the two ends of the buffer spring. The hydraulic oil cylinder has the advantages that under buffering of the buffering spring, the cylinder bottom of the cylinder barrel is prevented from being impacted by large force, meanwhile, when the buffering spring is compressed to the limit, the piston cannot continue to move in the direction close to the cylinder bottom of the cylinder barrel, and therefore the bottom impacting phenomenon is prevented, and the service life of the hydraulic oil cylinder is prolonged; and meanwhile, the buffer spring can be replaced.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a hydraulic cylinder with an anti-collision bottom. Background Technology

[0002] Hydraulic cylinders are key actuators in hydraulic systems, mainly used to convert hydraulic energy into mechanical energy to drive loads to perform linear motion. The main components of a hydraulic cylinder include cylinder barrel, piston, piston rod, and end cap. The end cap has a rod hole, in which the piston rod is movably inserted. The inner wall of the cylinder barrel at the end away from the cylinder head is the cylinder bottom.

[0003] In existing technology, the working principle of a hydraulic cylinder is to pump hydraulic oil into or out of the cylinder. When hydraulic oil is pumped into the end of the piston without the piston rod, the piston moves towards the cylinder head under the action of oil pressure, causing the piston rod to extend further out of the cylinder, thereby pushing the load away from the cylinder. When hydraulic oil is pumped into the end of the piston with the piston rod, the piston moves away from the cylinder head under the action of oil pressure, while simultaneously expelling the hydraulic oil from the end of the cylinder away from the cylinder head. This shortens the length of the piston rod extending out of the cylinder, thereby pulling the load towards the cylinder, thus achieving the function of driving the load to perform linear motion.

[0004] However, when the hydraulic cylinder is used vertically with the piston rod extending upwards, the weight of the load will press on the piston rod and then be transmitted to the piston. At this time, when the load needs to move towards the cylinder, the piston is driven by both oil pressure and the weight of the load. As a result, the piston will approach the bottom of the cylinder very quickly. When the piston contacts the bottom of the cylinder at a very high speed, it will collide with the bottom. This phenomenon is called the bottom impact phenomenon. The existence of the bottom impact phenomenon will cause collision damage to the cylinder and piston of the hydraulic cylinder. When the collision damage reaches a certain level, it will cause surface wear and fatigue damage to the cylinder and piston, thereby causing problems such as cylinder leakage, which will drastically shorten the service life of the hydraulic cylinder. Utility Model Content

[0005] The purpose of this invention is to provide a hydraulic cylinder with a shock-proof bottom to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic cylinder with anti-collision bottom, comprising: a cylinder barrel, a cylinder cover at one end of the cylinder barrel, a piston slidably connected in the cylinder cover, a piston rod fixed on the surface of the piston, the piston rod being movably inserted into the surface of the cylinder cover, two sets of oil holes on the surface of the cylinder barrel, a buffer spring on the surface of the piston, a fixed plate fixed on the surface of the piston, a slide rail on the surface of the piston, a slider slidably connected in the slide rail, a movable plate fixed on the surface of the slider, and the fixed plate and the movable plate being movably connected to the two ends of the buffer spring.

[0007] Preferably, both the fixed plate and the movable plate have an "L"-shaped plate structure.

[0008] Preferably, a pull rod hole is provided on the surface of the fixing plate, and a pull rod is movably inserted into the pull rod hole. The pull rod has a circular rod structure.

[0009] Preferably, the surface of the movable card plate is provided with a screw hole, one end of the pull rod is provided with a thread, and the threaded end of the pull rod is installed in the screw hole through a threaded connection.

[0010] Preferably, a support spring is sleeved on the rod body of the pull rod, with one end of the support spring abutting against the surface of the fixed plate and the other end of the support spring abutting against the surface of the movable plate.

[0011] Preferably, a pull block is fixed to the end of the pull rod away from the movable plate, and the pull block has a circular rod structure.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The anti-collision hydraulic cylinder proposed in this utility model has the following characteristics: When the piston moves close to the bottom of the cylinder, the buffer spring first contacts the bottom of the cylinder. As the piston continues to approach the bottom of the cylinder, the buffer spring is compressed. The compressed buffer spring generates a reaction force on the piston under its own elasticity. This reaction force is opposite to the direction of piston movement, thus slowing down the piston. Under the buffering effect of the buffer spring, the bottom of the cylinder is prevented from being impacted by a large force. At the same time, when the buffer spring is compressed to its limit, the piston can no longer move towards the bottom of the cylinder, thereby preventing the bottom collision phenomenon and extending the service life of the hydraulic cylinder. In addition, the buffer spring can be replaced. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the present invention.

[0016] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the slide rail.

[0018] In the diagram: 1. Cylinder; 2. Piston; 3. Fixed plate; 4. Slide rail; 5. Slider; 6. Moving plate; 7. Buffer spring; 8. Screw hole; 9. Tie rod hole; 10. Tie rod; 11. Support spring; 12. Pull block; 13. Cylinder head; 14. Piston rod; 15. Oil hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Example 1: Please refer to Figures 1 to 4 This utility model provides a technical solution: a hydraulic cylinder with anti-collision bottom, comprising: a cylinder barrel 1, a cylinder cover 13 at one end of the cylinder barrel 1, a piston 2 slidably connected in the cylinder cover 13, a piston rod 14 fixed on the surface of the piston 2, the piston rod 14 being movably inserted into the surface of the cylinder cover 13, two sets of oil holes 15 provided on the surface of the cylinder barrel 1, a buffer spring 7 provided on the surface of the piston 2, a fixed plate 3 fixed on the surface of the piston 2, a slide rail 4 provided on the surface of the piston 2, a slider 5 slidably connected in the slide rail 4, a movable plate 6 fixed on the surface of the slider 5, the fixed plate 3 and the movable plate 6 being movably connected to the two ends of the buffer spring 7, and both the fixed plate 3 and the movable plate 6 having an "L" shaped plate structure.

[0021] In actual use, when cylinder 1 is vertically positioned and piston rod 14 extends upwards from cylinder 1, the weight of the load at the end of piston rod 14 presses onto piston rod 14 and is transmitted to piston 2. When it is necessary to move the load closer to cylinder 1, hydraulic oil is pumped into cylinder 1 through oil hole 15 located above cylinder 1. Under the action of oil pressure and the weight of the load, piston 2 moves away from cylinder head 13, and the distance of piston rod 14 extending from cylinder 1 becomes shorter, thus causing the load at the end of piston rod 14 to move closer to cylinder 1. When piston 2 moves close to the bottom of cylinder 1, buffer spring 7 first contacts the bottom of cylinder 1. Subsequently, as piston 2 continues to approach the bottom of cylinder 1, buffer spring 7 is compressed. The compressed buffer spring 7 generates a reaction force on piston 2 under its own elasticity. This reaction force and the movement of piston 2 The opposite direction slows down the piston 2. The buffer spring 7 cushions the piston, preventing a large impact on the bottom of the cylinder 1. When the buffer spring 7 is compressed to its limit, the piston 2 can no longer move towards the bottom of the cylinder 1, thus preventing a bottom impact and extending the service life of the hydraulic cylinder. The buffer spring 7 is attached to the surface of the piston 2 by the fixed plate 3. After prolonged use, if the spring force decreases, the cylinder head 13 can be removed, the piston 2 removed from the cylinder 1, and the slider 5 moved in the slide rail 4 towards the fixed plate 3, causing the moving plate 6 to move towards the fixed plate 3. The old buffer spring 7 can then be removed, replaced with a new one, and the moving plate 6 returned to its original position, completing the replacement of the buffer spring 7.

[0022] Example 2: Based on Example 1, in order to control the position of the movable card plate 6 to replace the buffer spring 7, a pull rod hole 9 is provided on the surface of the fixed card plate 3, and a pull rod 10 is movably inserted into the pull rod hole 9. The pull rod 10 has a circular rod structure. A screw hole 8 is provided on the surface of the movable card plate 6. One end of the pull rod 10 has a thread, and the threaded end of the pull rod 10 is installed in the screw hole 8 through a threaded connection. A support spring 11 is sleeved on the rod body of the pull rod 10. One end of the support spring 11 abuts against the surface of the fixed card plate 3, and the other end of the support spring 11 abuts against the surface of the movable card plate 6. A pull block 12 is fixed at the end of the pull rod 10 away from the movable card plate 6. The pull block 12 has a circular rod structure.

[0023] When the buffer spring 7 needs to be replaced, pull the pull block 12 away from the fixed plate 3. The pull block 12 pulls one end of the pull rod 10 out of the pull rod hole 9. The pull rod 10 drives the movable plate 6 to move in the same direction through the threaded connection with the screw hole 8. When the distance between the fixed plate 3 and the movable plate 6 is close, the old buffer spring 7 can be removed from the fixed plate 3 and the movable plate 6. At this time, the support spring 11 is compressed. After replacing the new buffer spring 7, release the pull block 12. The support spring 11 pushes the movable plate 6 back to its original position under its own elastic state. The fixed plate 3 and the movable plate 6 are re-engaged at both ends of the buffer spring 7, completing the replacement of the buffer spring 7.

[0024] Example 3: Based on Example 2, in order to replace the support spring 11, a pull rod hole 9 is provided on the surface of the fixed plate 3, and a pull rod 10 is movably inserted into the pull rod hole 9. The pull rod 10 has a circular rod structure. A screw hole 8 is provided on the surface of the movable plate 6. One end of the pull rod 10 is threaded, and the threaded end of the pull rod 10 is installed in the screw hole 8 through a threaded connection. A support spring 11 is sleeved on the rod body of the pull rod 10. One end of the support spring 11 abuts against the surface of the fixed plate 3, and the other end of the support spring 11 abuts against the surface of the movable plate 6. A pull block 12 is fixed at the end of the pull rod 10 away from the movable plate 6. The pull block 12 has a circular rod structure.

[0025] When the support spring 11 needs to be replaced, rotate the pull block 12. The pull block 12 drives the pull rod 10 to rotate, unscrewing the pull rod 10 from the screw hole 8. Then pull the pull rod 10 out of the pull rod hole 9 to remove the old support spring 11 and replace it with a new support spring 11. After replacement, insert the pull rod 10 back into the pull rod hole 9 and screw it into the screw hole 8. The pull rod 10 will then be inserted into the support spring 11, completing the replacement of the support spring 11.

[0026] In actual use, when cylinder 1 is vertically positioned and piston rod 14 extends upwards from cylinder 1, the weight of the load at the end of piston rod 14 presses onto piston rod 14 and is transmitted to piston 2. When it is necessary to move the load closer to cylinder 1, hydraulic oil is pumped into cylinder 1 through oil hole 15 located above cylinder 1. Under the action of oil pressure and the weight of the load, piston 2 moves away from cylinder head 13, and the distance of piston rod 14 extending from cylinder 1 becomes shorter, thereby causing the load at the end of piston rod 14 to move closer to cylinder 1. When piston 2 moves close to the bottom of cylinder 1, buffer spring 7 first contacts the bottom of cylinder 1, and then, as piston 2 continues to move closer to the bottom of cylinder 1... The buffer spring 7 is compressed. Under its own elasticity, the compressed buffer spring 7 generates a reaction force on the piston 2. This reaction force is opposite to the direction of piston 2's movement, thus slowing down the piston 2. The buffer spring 7 cushions the piston 2, preventing a large impact on the bottom of the cylinder 1. Furthermore, when the buffer spring 7 is compressed to its limit, the piston 2 can no longer move towards the bottom of the cylinder 1, preventing bottom impact and extending the service life of the hydraulic cylinder. The buffer spring 7 is secured to the surface of the piston 2 by the fixing plate 3. When the spring 7's elasticity decreases after long-term use, the cylinder head 13 can be removed, and the piston 2 can be removed from the cylinder. Remove the old buffer spring 7 from cylinder 1, then move the slider 5 in the slide rail 4 towards the fixed plate 3, causing the movable plate 6 to move towards the fixed plate 3. Then remove the old buffer spring 7, replace it with a new one, and return the movable plate 6 to its original position. This completes the replacement of the buffer spring 7. When replacing the buffer spring 7, pull the pull block 12 away from the fixed plate 3. The pull block 12 pulls one end of the pull rod 10 out of the pull rod hole 9. The pull rod 10, through its threaded connection with the screw hole 8, drives the movable plate 6 to move in the same direction. When the distance between the fixed plate 3 and the movable plate 6 is close, the old buffer spring 7 can be removed from both the fixed plate 3 and the movable plate 6. The support spring 11 is compressed; after replacing the new buffer spring 7, the pull block 12 is released, and the support spring 11 pushes the movable clamping plate 6 back to its original position under its own elastic state. The fixed clamping plate 3 and the movable clamping plate 6 are re-clamped at both ends of the buffer spring 7, completing the replacement of the buffer spring 7; when the support spring 11 needs to be replaced, the pull block 12 is rotated, and the pull block 12 drives the pull rod 10 to rotate, unscrewing the pull rod 10 from the screw hole 8, and then pulling the pull rod 10 out of the pull rod hole 9, so that the old support spring 11 can be removed and replaced with a new support spring 11. After replacement, the pull rod 10 is inserted back into the pull rod hole 9 and screwed into the screw hole 8, and the pull rod 10 is also inserted into the support spring 11, completing the replacement of the support spring 11.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder with a crash-resistant base, comprising: A cylinder (1) is provided with a cylinder head (13) at one end of the cylinder (1). A piston (2) is slidably connected in the cylinder head (13). A piston rod (14) is fixed on the surface of the piston (2). The piston rod (14) is movably inserted into the surface of the cylinder head (13). Two sets of oil holes (15) are provided on the surface of the cylinder (1). The cylinder (1) is characterized in that: a buffer spring (7) is provided on the surface of the piston (2). A fixed plate (3) is fixed on the surface of the piston (2). A slide rail (4) is provided on the surface of the piston (2). A slider (5) is slidably connected in the slide rail (4). A movable plate (6) is fixed on the surface of the slider (5). The fixed plate (3) and the movable plate (6) are movably connected to the two ends of the buffer spring (7).

2. The hydraulic cylinder for anti-collision bottom according to claim 1, characterized in that: Both the fixed plate (3) and the movable plate (6) have an "L" shaped plate structure.

3. The hydraulic cylinder for anti-collision bottom according to claim 1, characterized in that: The fixed plate (3) has a pull rod hole (9) on its surface, and a pull rod (10) is movably inserted into the pull rod hole (9). The pull rod (10) has a circular rod structure.

4. The hydraulic cylinder for anti-collision bottom according to claim 3, characterized in that: The movable card plate (6) has a screw hole (8) on its surface, and one end of the pull rod (10) has a thread. The threaded end of the pull rod (10) is installed in the screw hole (8) through a threaded connection.

5. A hydraulic cylinder for anti-collision bottom as described in claim 4, characterized in that: A support spring (11) is sleeved on the rod body of the pull rod (10). One end of the support spring (11) abuts against the surface of the fixed plate (3), and the other end of the support spring (11) abuts against the surface of the movable plate (6).

6. The hydraulic cylinder for anti-collision bottom according to claim 5, characterized in that: The end of the pull rod (10) away from the movable plate (6) is fixed with a pull block (12), which has a circular rod structure.

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