Long-stroke hydraulic cylinder for engineering machinery

Abstract

The long-stroke hydraulic cylinder for the engineering machinery comprises a cylinder body, a front end cover, a rear end cover, a piston rod and a piston ring, the piston rod and the piston ring are installed in the cylinder body, the piston ring is fixed to the end of the piston rod, one end of the piston rod extends out of the cylinder body, the front end cover and the rear end cover are arranged at the two ends of the cylinder body respectively, and the piston ring is fixed to the piston rod. The cylinder body is fixedly connected with the front end cover through bolts, an oil inlet and an oil outlet are formed in the cylinder body, a dustproof sleeve is arranged at the front end cover, the piston rod is sleeved with the dustproof sleeve, one end of the dustproof sleeve is fixed to the top end of the piston rod, the other end of the dustproof sleeve is fixed to the upper surface of the front end cover, and the dustproof sleeve is made of flexible materials. The surface of the front end cover is further provided with a dirt cleaning ring, the piston rod penetrates through the dirt cleaning ring, a clamping groove is formed in the surface of the front end cover, the dirt cleaning ring is fixed in the clamping groove, and through the design of the dustproof sleeve and the dirt cleaning ring, dust and dirt are effectively prevented from entering the hydraulic cylinder, and the hydraulic cylinder is kept clean and works normally.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a long-stroke hydraulic cylinder for engineering machinery. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device, has no transmission backlash, and provides smooth movement. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] Chinese patent document CN201720316263.2 discloses a hydraulic cylinder with a displacement measuring device. The key technical points of this solution include a cylinder barrel, a cylinder bottom fixed to one end of the cylinder barrel to seal the cylinder body, and a piston assembly inserted into the cylinder barrel. A spare cap is threaded onto the inner ring surface of the cylinder barrel at the end away from the cylinder bottom. A connecting groove is formed on the side wall of the cylinder bottom. A through groove is formed on the side wall of the connecting groove facing the cylinder barrel, and a magnetostrictive displacement sensor is threaded into the through groove. Embedded slots are formed on the piston and piston rod corresponding to the position of the magnetostrictive displacement sensor. An internal thread is formed on the inner ring surface of the connecting groove, and a connector is threaded onto the internal thread. An L-shaped flexible hose for inserting a cable is connected between the connector and the magnetostrictive displacement sensor. A ring magnet is embedded on the inner ring surface of the piston facing the magnetostrictive displacement sensor. This achieves the technical effect of conveniently and accurately controlling and measuring the displacement of the piston rod, improving the practicality of the equipment.

[0004] However, the above-mentioned patent has certain defects in use. Due to the long stroke of the hydraulic cylinder, when used in construction machinery, the piston rod has no protective device when it extends out of the cylinder due to the harsh construction environment. After long-term use, it will get dusty and contaminate the hydraulic oil and the inside of the cylinder when it retracts, which will aggravate wear.

[0005] To address these issues, a long-stroke hydraulic cylinder for engineering machinery is proposed here. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, this utility model provides a long-stroke hydraulic cylinder for engineering machinery.

[0007] This utility model is achieved using the following technical solution:

[0008] A long-stroke hydraulic cylinder for engineering machinery includes a cylinder body, a front end cover, a rear end cover, a piston rod, and a piston. The piston rod and piston are installed inside the cylinder body, and the piston is fixed to the end of the piston rod. One end of the piston rod extends out of the cylinder body. The front end cover and the rear end cover are respectively located at both ends of the cylinder body and are fixedly connected to it by bolts. The cylinder body has an oil inlet and an oil outlet. A dust cover is provided at the front end cover. The dust cover is fitted onto the piston rod, with one end fixed to the top of the piston rod and the other end fixed to the upper surface of the front end cover. The dust cover is made of a flexible material and can extend and retract with the piston rod.

[0009] The surface of the front cover is also provided with a cleaning ring, the piston rod passes through the cleaning ring, and the surface of the front cover is provided with a slot, in which the cleaning ring is fixed.

[0010] A spring is installed inside the cylinder body, and the spring is installed at one end near the rear end cover.

[0011] The cylinder body is provided with a first buffer ring, which is located on the side of the spring away from the rear end cover. The inner wall of the cylinder body near the rear end cover is provided with a limiting groove, and the first buffer ring is interference-fitted with the cylinder body.

[0012] The cylinder body is provided with a second buffer ring, and the side wall of the second buffer ring is provided with multiple mounting posts. The second buffer ring is located on the side close to the front end cover. The front end cover is provided with fixing holes, and the second buffer ring is engaged with the front end cover.

[0013] The piston rod is provided with a lifting ring at the top, and the lifting ring is welded and fixed to the piston rod;

[0014] The rear end cover is provided with a lifting ring, which is threadedly connected to the rear end cover.

[0015] The present invention has the following advantages over the prior art:

[0016] 1. By installing a dust cover on the piston rod, which covers the entire piston rod and can extend and retract with the piston rod, the dust cover effectively prevents the piston rod from getting dust and impurities. In addition, a cleaning ring is installed at the front end cover. The cleaning ring can scrape off the dust on the piston rod and ensure that dust does not enter the cylinder. Through the design of the dust cover and cleaning ring, dust and dirt are effectively blocked from entering the hydraulic cylinder, keeping the hydraulic cylinder clean and working normally.

[0017] 2. By setting a spring, a first buffer ring, and a second buffer ring inside the cylinder, the spring can buffer the piston rod. The setting of the spring and buffer ring reduces the impact and vibration of the piston rod during the extension and retraction process, and improves the stability and safety of the hydraulic cylinder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is an exploded view of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the front structure of this utility model;

[0021] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0022] Figure 5 This is a schematic diagram of the installation structure of the front cover, cleaning ring, and second buffer ring of this utility model;

[0023] In the diagram: 1. Cylinder body; 11. Oil inlet; 12. Oil outlet; 13. Limiting groove; 2. Dust cover; 3. Lifting ring; 4. Piston rod; 41. Piston ring; 42. Limiting block; 43. Sealing ring; 5. Cleaning ring; 6. Rear end cover; 7. Front end cover; 71. Fixing hole; 72. Slot; 8. Second buffer ring; 81. Mounting post; 9. Spring; 10. First buffer ring. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figures 1 to 5 As shown, a long-stroke hydraulic cylinder for engineering machinery includes a cylinder body 1, a front end cover 7, a rear end cover 6, a piston rod 4, and a piston ring 41. The piston rod 4 and piston ring 41 are installed inside the cylinder body 1, and the piston ring 41 is fixed to the end of the piston rod 4. One end of the piston rod 4 extends out of the cylinder body 1. The front end cover 7 and the rear end cover 6 are respectively located at both ends of the cylinder body 1 and are fixedly connected to it by bolts. The cylinder body 1 is provided with an oil inlet 11 and an oil outlet 12. A dust cover 2 is provided at the front end cover 7. The dust cover 2 is fitted onto the piston rod 4, with one end fixed to the top of the piston rod 4 and the other end fixed to the upper surface of the front end cover 7. The dust cover 2 is made of a flexible material, such as rubber or silicone, and can extend and retract with the piston rod 4. The dust cover 2 effectively prevents dust and dirt from entering the interior of the cylinder body 1, protecting the normal operation of the hydraulic cylinder.

[0027] The front cover 7 is also provided with a cleaning ring 5, through which the piston rod 4 passes. The front cover 7 has a groove 72, in which the cleaning ring 5 is fixed. As the piston rod 4 extends and retracts, the cleaning ring 5 can scrape away dirt from the surface of the piston rod 4, keeping it clean and further extending the service life of the hydraulic cylinder. The front cover 7 and the rear cover 6 are respectively installed at both ends of the cylinder body 1 to seal the cylinder body 1, prevent hydraulic oil leakage, and fix components such as the piston rod 4 and the dust cover 2. The front cover 7 and the rear cover 6 are tightly connected to the cylinder body 1 by bolts, forming a sealed hydraulic chamber. The oil inlet 11 and oil outlet 12 on the cylinder body 1 are used for the entry and exit of hydraulic oil, driving the piston rod 4 to extend and retract.

[0028] A spring 9 is installed inside the cylinder body 1. The spring 9 is installed at one end near the rear end cover 6. When the piston rod 4 retracts quickly, the spring 9 acts as a buffer, absorbing part of the impact force, reducing vibration, and improving the stability and safety of the hydraulic cylinder.

[0029] The cylindrical body 1 is provided with a first buffer ring 10, which is located on the side of the spring 9 away from the rear end cover 6. A limiting groove 13 is provided on the inner wall of the end of the cylindrical body 1 closest to the rear end cover 6. The first buffer ring 10 is interference-fitted with the cylindrical body 1. The first buffer ring 10 serves to further buffer and limit movement.

[0030] The cylinder body 1 is equipped with a second buffer ring 8. Multiple mounting posts 81 are provided on the side wall of the second buffer ring 8. The second buffer ring 8 is located near the front end cover 7, which has fixing holes 71. The second buffer ring 8 is engaged with the front end cover 7. The second buffer ring 8 engages with the fixing holes 71 of the front end cover 7 via the mounting posts 81, ensuring that the piston rod 4 does not wobble or shift during extension. The second buffer ring 8 serves to buffer and fix the piston rod 4, preventing excessive vibration during high-speed movement.

[0031] The piston rod 4 is provided with a lifting ring 3 at the top, and the lifting ring 3 is welded and fixed to the piston rod 4;

[0032] The rear end cover 6 is provided with a lifting ring 3, which is threadedly connected to the rear end cover 6. Lifting rings 3 are provided on both the front and rear sides of the entire hydraulic cylinder, which facilitates lifting and transportation, and also facilitates the installation and disassembly of the hydraulic cylinder on engineering machinery.

[0033] The working principle of this utility model is as follows: When in use, the hydraulic cylinder is in a stationary state, the piston rod 4 is in the initial position, the dust cover 2 tightly wraps around the piston rod 4 to prevent dust and dirt from entering, the spring 9 is in a natural state, and the first buffer ring 10 and the second buffer ring 8 are respectively in their set positions.

[0034] The hydraulic pump delivers high-pressure hydraulic oil to the oil inlet 11 of the hydraulic cylinder. The hydraulic oil pushes the piston forward, which in turn drives the piston rod 4 to extend. During the extension of the piston rod 4, the dust cover 2 extends and retracts accordingly to maintain the seal. As the piston rod 4 moves, the cleaning ring 5 scrapes off the dirt on its surface. When the piston rod 4 approaches the front cover 7, the second buffer ring 8 plays a buffering role to reduce the impact force of the piston rod 4.

[0035] The hydraulic pump changes direction and delivers hydraulic oil to the oil outlet 12 of the hydraulic cylinder, which reduces the internal pressure of the hydraulic cylinder. The spring force of the spring 9 pushes the piston to move backward, which in turn drives the piston rod 4 to retract. During the retraction of the piston rod 4, the dust cover 2 also extends and retracts to maintain the seal. The cleaning ring 5 continues to scrape off the dirt on its surface. When the piston rod 4 approaches the rear end cover 6, the first buffer ring 10 plays a buffering role to prevent the piston rod 4 from directly colliding with the rear end cover 6.

[0036] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A long-stroke hydraulic cylinder for engineering machinery, comprising a cylinder body (1), a front end cover (7), a rear end cover (6), a piston rod (4), and a piston ring (41), wherein the piston rod (4) and the piston ring (41) are installed inside the cylinder body (1), the piston ring (41) is fixed to the end of the piston rod (4), one end of the piston rod (4) extends out of the cylinder body (1), the front end cover (7) and the rear end cover (6) are respectively disposed at both ends of the cylinder body (1) and fixedly connected thereto by bolts, and the cylinder body (1) is provided with an oil inlet (11) and an oil outlet (12), characterized in that: The front cover (7) is provided with a dust cover (2). The dust cover (2) is fitted on the piston rod (4). One end is fixed to the top of the piston rod (4), and the other end is fixed to the upper surface of the front cover (7). The dust cover (2) is made of flexible material and can extend and retract with the piston rod (4). The surface of the front cover (7) is also provided with a cleaning ring (5), the piston rod (4) passes through the cleaning ring (5), the surface of the front cover (7) is provided with a slot (72), and the cleaning ring (5) is fixed in the slot (72).

2. The long-stroke hydraulic cylinder for engineering machinery according to claim 1, characterized in that: The cylinder body (1) is provided with a spring (9), which is installed at one end near the rear end cover (6).

3. A long-stroke hydraulic cylinder for engineering machinery according to claim 2, characterized in that: The cylinder body (1) is provided with a first buffer ring (10), which is located on the side of the spring (9) away from the rear end cover (6). A limiting groove (13) is provided on the inner wall of the cylinder body (1) near the rear end cover (6). The first buffer ring (10) is interference-fitted with the cylinder body (1).

4. A long-stroke hydraulic cylinder for engineering machinery according to claim 1, characterized in that: The cylinder body: (1) has a second buffer ring (8) inside. The side wall of the second buffer ring (8) has multiple mounting posts (81). The second buffer ring (8) is located on the side close to the front cover (7). The front cover (7) has a fixing hole (71). The second buffer ring (8) is engaged with the front cover (7).

5. A long-stroke hydraulic cylinder for engineering machinery according to claim 1, characterized in that: The piston rod (4) is provided with a lifting ring (3) at the top, and the lifting ring (3) is welded and fixed to the piston rod (4); The rear end cover (6) is provided with a lifting ring (3), which is threadedly connected to the rear end cover (6).

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