Liquid leakage prevention type hydraulic oil cylinder

Abstract

The utility model discloses a liquid leakage prevention type hydraulic oil cylinder which comprises a cylinder barrel, a front end cover installed at the front end of the cylinder barrel, a plurality of wear-resistant rings fixed in the cylinder barrel and distributed in a linear array mode, and a piston rod connected in the wear-resistant rings in a sliding mode. The oil leakage prevention sealing assembly comprises a sealing cover, a plurality of pressurizing elastic oil seals are fixedly connected to the inner side wall of the sealing cover, and a pressurizing plate is slidably connected to the position, close to the front end, of the interior of the sealing cover in a limited mode. According to the utility model, the pressurizing plate is driven by the pressurizing spring to move towards the rear side, hydraulic oil in the detection cylinder enters the front cavity of the sealing cover, and the sliding sheet is driven by the top spring to move downwards so as to extrude the trigger spring; the buzzer is triggered to give an alarm, and the alarm can be fed back to a worker at the first time when the oil seal part is abraded, so that the worker can maintain as early as possible.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a leak-proof hydraulic cylinder. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It consists of components such as cylinder barrel and cylinder head, piston and piston rod, and sealing devices. The working principle of the hydraulic cylinder's oil seal is based on the tight fit between the sealing lip and the sealing surface. The sealing lip of the oil seal is usually made of elastic materials such as rubber. After installation, the lip is deformed under certain pressure and fits tightly against the piston rod or the inner wall of the cylinder where sealing is required. When there is pressure in the hydraulic oil, the oil exerts pressure on the oil seal. The oil seal balances the oil pressure through its own elastic deformation, preventing hydraulic oil from leaking to the outside and also preventing external impurities from entering the hydraulic cylinder.

[0003] However, hydraulic cylinder oil seals are prone to wear due to long-term friction, leading to hydraulic oil leakage. Once the oil seal wears out, hydraulic oil will gradually seep out during operation. Because leakage is usually slow and may occur in hard-to-observe parts inside the equipment, it is difficult to detect. However, the hazards are serious. Leakage will cause a drop in hydraulic system pressure, affecting the normal operating efficiency and accuracy of the equipment. At the same time, leaked hydraulic oil will pollute the environment, increase maintenance costs, and long-term leakage may also cause excessive wear of internal parts of the hydraulic cylinder due to insufficient hydraulic oil, shortening the service life of the equipment. In addition, if leakage is not detected and dealt with in time, it may cause safety accidents in some critical equipment, threatening the lives of operators. Based on the above points, those skilled in the art have provided a leak-proof hydraulic cylinder. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a leak-proof hydraulic cylinder. This leak-proof hydraulic cylinder uses a pressure spring to move the pressure plate to the rearward direction, allowing hydraulic oil inside the detection cylinder to enter the front cavity of the sealing cover. The sliding plate is moved downward by the top spring, which in turn squeezes the trigger spring. After the trigger spring is squeezed, the trigger buzzer will start to sound an alarm, providing immediate feedback to the staff as soon as wear occurs in the oil seal, so that the staff can perform maintenance as soon as possible.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A leak-proof hydraulic cylinder includes a cylinder barrel, a front end cover installed at the front end of the cylinder barrel, a plurality of anti-wear rings fixed inside the cylinder barrel and arranged in a linear array, and a piston rod slidably connected inside the plurality of anti-wear rings. The front end cover is internally threaded with a leak-proof sealing assembly, which includes a sealing cover. A plurality of pressurized elastic oil seals are fixedly connected to the inner wall of the sealing cover. A pressure plate is slidably connected to the interior of the sealing cover near its front end. The interior of the sealing cover is divided into front and rear cavities by the pressure plate. Both cavities of the sealing cover store hydraulic oil. A plurality of pressure springs arranged in a circumferential array are fixedly connected to the front wall of the pressure plate. The front ends of the pressure springs are fixedly connected to the front inner wall of the sealing cover. A rear end cover is installed at the rear end of the cylinder barrel. The rear end cover includes an end cover body, and a hydraulic injection port is provided on the end cover body.

[0007] Through the above technical solution, the hydraulic cylinder seals the moving end of the piston rod. Several pressurized elastic oil seals are made of elastic rubber material, and lubricating oil is applied to the sealing part where they fit with the piston rod. The lubricating oil forms an oil film between the pressurized elastic oil seal and the piston rod. The thickness of this oil film varies with the magnitude of the radial force. When the thickness of the oil film is kept within a certain range, a good sealing effect can be achieved. The elastic force of several pressure springs applied to the pressure plate causes the liquid in the cavity behind the sealing cover to be squeezed, thereby allowing the pressurized elastic oil seal to fit against the outer surface of the piston rod, fully ensuring its sealing performance.

[0008] Furthermore, a detection cylinder is fixedly connected to the top of the sealing cover and above the front cavity of the sealing cover. A top cover is fixedly connected to the top of the detection cylinder via several connecting rods. A top spring is fixedly connected to the bottom of the top cover. A slider is fixedly connected to the bottom end of the top spring. The slider is slidably connected to the inside of the detection cylinder. A trigger spring is installed on the inner wall of the detection cylinder. A buzzer is installed on the outer side of the detection cylinder. The buzzer is electrically connected to the trigger spring. The trigger spring is located below the slider.

[0009] With the above technical solution, when the pressure elastic oil seal part wears, the hydraulic sealing oil located on the rear side of the sealing cover will leak from the wear point. At this time, the pressure spring will drive the pressure plate to move to the rear side, and the hydraulic oil located inside the detection cylinder will enter the front cavity of the sealing cover. The slide will be driven down by the top spring, which will then squeeze the trigger spring. After the trigger spring is squeezed, the buzzer will be triggered to start the alarm, reminding the staff that the hydraulic cylinder is leaking, so that the staff can maintain it as soon as possible.

[0010] Furthermore, a wedge-shaped groove that mates with the trigger spring is provided on the side wall of the slider located above the trigger spring;

[0011] The above technical solution allows the slider to compress the trigger spring during its downward movement, thus avoiding damage to the trigger spring due to rigid contact.

[0012] Furthermore, a number of adjusting screws are installed on the front sidewall of the pressure plate, and the adjusting screws penetrate the front sidewall of the sealing cover;

[0013] By using the above technical solution, the pressure plate is moved forward by pulling the adjusting screw, so that the pressure elastic oil seal is no longer squeezed by the hydraulic oil in the rear cavity, and the pressure elastic oil seal no longer keeps in close contact with the piston rod, thus facilitating the process of disassembling the oil leakage prevention sealing assembly from the inside of the front cover.

[0014] Furthermore, the front section of the adjusting screw is elliptical, and the front half of the front section of the adjusting screw is rotatably connected to the rear half of the front section.

[0015] With the above technical solution, when it is necessary to disassemble the oil leak prevention sealing component, pull the adjusting screw and then rotate the front half of the adjusting screw so that the front half of the adjusting screw is locked in front of the sealing cover, thereby realizing the work process of replacing the oil leak prevention sealing component by a single person, making the disassembly and maintenance work more convenient.

[0016] This utility model has the following beneficial effects:

[0017] 1. In this utility model, the elastic force applied to the pressure plate by the pressure spring causes the liquid in the cavity behind the sealing cover to be squeezed, thereby allowing the pressure elastic oil seal to fit against the outer surface of the piston rod, thus fully ensuring its sealing performance.

[0018] 2. In this utility model, when the pressure elastic oil seal part is worn, the hydraulic sealing oil located on the rear side of the sealing cover will leak from the worn part. At this time, the pressure spring will drive the pressure plate to move to the rear side, and the hydraulic oil located inside the detection cylinder will enter the front cavity of the sealing cover. The slide will be driven down by the top spring, thereby squeezing the trigger spring. After the trigger spring is squeezed, the buzzer will be triggered to start the alarm, reminding the staff that the hydraulic cylinder is leaking, so that the staff can maintain it as soon as possible.

[0019] 3. In this utility model, by pulling the adjusting screw, the pressure plate is moved forward, so that the pressure elastic oil seal is no longer squeezed by the hydraulic oil in the rear cavity, and the pressure elastic oil seal no longer keeps in close contact with the piston rod, thus facilitating the process of disassembling the oil leakage prevention sealing assembly from the inside of the front cover. Attached Figure Description

[0020] Figure 1 A perspective view of a leak-proof hydraulic cylinder proposed in this utility model;

[0021] Figure 2 This is a first top view of a leak-proof hydraulic cylinder proposed in this utility model;

[0022] Figure 3 for Figure 2 Isometric side sectional view at point AA;

[0023] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0024] Figure 5 This is a second top view of a leak-proof hydraulic cylinder proposed in this utility model;

[0025] Figure 6 for Figure 5 Isometric side sectional view at the center CC.

[0026] Legend:

[0027] 1. Cylinder barrel; 2. Rear end cover; 3. Front end cover; 4. Oil leakage prevention sealing assembly; 5. Piston rod; 6. Anti-wear ring;

[0028] 21. End cap body; 22. Hydraulic injection port;

[0029] 41. Sealing cover; 42. Pressure plate; 43. Pressure spring; 44. Adjusting screw; 45. Pressure elastic oil seal; 46. Detection cylinder; 47. Top cover; 48. Top spring; 49. Sliding plate; 410. Buzzer; 411. Trigger spring. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 1-6This utility model provides an embodiment of a leak-proof hydraulic cylinder, comprising a cylinder barrel 1, a front end cover 3 installed at the front end of the cylinder barrel 1, a plurality of anti-wear rings 6 fixed inside the cylinder barrel 1 and arranged in a linear array, a piston rod 5 slidably connected inside the plurality of anti-wear rings 6, and an oil leak-proof sealing assembly 4 threadedly connected inside the front end cover 3. The oil leak-proof sealing assembly 4 includes a sealing cover 41, a plurality of pressurized elastic oil seals 45 fixedly connected to the inner side wall of the sealing cover 41, a pressure plate 42 slidably connected to the interior of the sealing cover 41 near the front end, the interior of the sealing cover 41 being divided into front and rear cavities by the pressure plate 42, both of which store hydraulic oil, and a plurality of pressure springs 43 arranged in a circumferential array fixedly connected to the front side wall of the pressure plate 42. The end is fixedly connected to the front inner wall of the sealing cover 41. The hydraulic cylinder seals the movable end of the piston rod 5. Several pressurized elastic oil seals 45 are made of elastic rubber material. The sealing part and the position where they fit with the piston rod 5 are coated with lubricating oil. The lubricating oil forms an oil film between the pressurized elastic oil seal 45 and the piston rod 5. The thickness of this oil film will change with the magnitude of the radial force. When the thickness of the oil film is kept within a certain range, a good sealing effect can be achieved. The elastic force of several pressure springs 43 applied to the pressure plate 42 causes the liquid in the rear cavity of the sealing cover 41 to be squeezed, so that the pressurized elastic oil seal 45 can fit against the outer surface of the piston rod 5, fully ensuring its sealing performance. The rear end of the cylinder 1 is equipped with a rear end cover 2. The rear end cover 2 includes an end cover body 21. The end cover body 21 is provided with a hydraulic injection port 22.

[0032] A detection cylinder 46 is fixedly connected to the top of the sealing cover 41 and above the front cavity of the sealing cover 41. A top cover 47 is fixedly connected to the top of the detection cylinder 46 via several connecting rods. A top spring 48 is fixedly connected to the bottom of the top cover 47. A slider 49 is fixedly connected to the bottom end of the top spring 48. The slider 49 is slidably connected inside the detection cylinder 46. A trigger spring 411 is installed on the inner wall of the detection cylinder 46. A buzzer 410 is installed on the outer side of the detection cylinder 46. The buzzer 410 is electrically connected to the trigger spring 411. The trigger spring 411 is located below the slider 49. When the pressure elastic oil seal 45 experiences wear, the hydraulic sealing oil located at the rear of the sealing cover 41 will... When leakage occurs at the wear point, the pressure spring 43 will drive the pressure plate 42 to move to the rearward side, and the hydraulic oil inside the detection cylinder 46 will enter the front cavity of the sealing cover 41. The slide plate 49 will be driven down by the top spring 48, thereby squeezing the trigger spring 411. After the trigger spring 411 is squeezed, the buzzer 410 will be triggered to start the alarm, reminding the staff that there is a leak in the hydraulic cylinder so that the staff can maintain it as soon as possible. The slide plate 49 has a wedge-shaped groove on the side wall above the trigger spring 411 that cooperates with the trigger spring 411, so that the slide plate 49 can squeeze the trigger spring 411 during the downward movement, avoiding rigid contact that could damage the trigger spring 411.

[0033] Several adjusting screws 44 are installed on the front side wall of the pressure plate 42. The adjusting screws 44 penetrate the front side wall of the sealing cover 41. By pulling the adjusting screws 44, the pressure plate 42 is moved forward, so that the pressure elastic oil seal 45 is no longer squeezed by the hydraulic oil in the rear cavity. The pressure elastic oil seal 45 is no longer tightly fitted with the piston rod 5, which facilitates the process of removing the oil leakage sealing assembly 4 from the inside of the front cover 3. The front section of the adjusting screw 44 is elliptical, and the front half of the front section of the adjusting screw 44 is rotatably connected to the rear half of the front section. When it is necessary to remove the oil leakage sealing assembly 4, pull the adjusting screw 44, and then rotate the front half of the front section of the adjusting screw 44 so that the front half of the front end of the adjusting screw 44 is stuck on the front side of the sealing cover 41, thereby realizing the work process of replacing the oil leakage sealing assembly 4 by a single person, making the disassembly and maintenance work more convenient.

[0034] Working principle: The hydraulic cylinder seals the movable end of the piston rod 5. Several pressurized elastic oil seals 45 are made of elastic rubber, and lubricating oil is applied to the sealing part where they contact the piston rod 5. The lubricating oil forms an oil film between the pressurized elastic oil seals 45 and the piston rod 5. The thickness of this oil film varies with the magnitude of the radial force. When the thickness of the oil film is maintained within a certain range, a good sealing effect can be achieved. The elastic force of several pressure springs 43 applied to the pressure plate 42 compresses the liquid in the rear cavity of the sealing cover 41, thereby allowing the pressurized elastic oil seals 45 to adhere to the outer surface of the piston rod 5, fully ensuring its sealing performance. When the pressurized elastic oil seals 45 wear, the hydraulic sealing oil located on the rear side of the sealing cover 41 will leak from the wear point. At this time, the pressure springs 43 will drive the pressure plate 42 to move rearward, and the hydraulic oil located inside the detection cylinder 46 will enter. Upon entering the front cavity of the sealing cover 41, the slide plate 49 is driven downward by the top spring 48, thereby squeezing the trigger spring 411. After the trigger spring 411 is squeezed, the buzzer 410 will be triggered to sound an alarm, reminding the staff that there is a leak in the hydraulic cylinder so that the staff can perform maintenance as soon as possible. The wedge-shaped groove on the slide plate 49 allows the slide plate 49 to squeeze the trigger spring 411 during its downward movement, avoiding rigid contact that could damage the trigger spring 411. When it is necessary to disassemble the oil leak prevention sealing assembly 4, pull the adjusting screw 44 and then rotate the front half of the adjusting screw 44 so that the front half of the adjusting screw 44 is stuck on the front side of the sealing cover 41. This prevents the pressure elastic oil seal 45 from being squeezed by the hydraulic oil in the rear cavity, and the pressure elastic oil seal 45 is no longer tightly fitted with the piston rod 5, thus facilitating the process of disassembling the oil leak prevention sealing assembly 4 from the inside of the front cover 3.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leak-proof hydraulic cylinder, comprising a cylinder barrel (1), a front end cap (3) installed at the front end of the cylinder barrel (1), a plurality of anti-wear rings (6) fixed inside the cylinder barrel (1) and arranged in a linear array, and a piston rod (5) slidably connected inside the plurality of anti-wear rings (6), characterized in that: The front end cover (3) is internally threaded with an oil leak prevention sealing assembly (4). The oil leak prevention sealing assembly (4) includes a sealing cover (41). Several pressurized elastic oil seals (45) are fixedly connected to the inner side wall of the sealing cover (41). A pressure plate (42) is slidably connected to the front end of the sealing cover (41). The interior of the sealing cover (41) is divided into two cavities, front and rear, by the pressure plate (42). Hydraulic oil is stored in both cavities of the sealing cover (41). Several pressure springs (43) arranged in a circular array are fixedly connected to the front side wall of the pressure plate (42). The front ends of several pressure springs (43) are fixedly connected to the front inner wall of the sealing cover (41). A rear end cover (2) is installed at the rear end of the cylinder (1). The rear end cover (2) includes an end cover body (21). A hydraulic injection port (22) is provided on the end cover body (21).

2. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: A detection cylinder (46) is fixedly connected to the top of the sealing cover (41) and above the front cavity of the sealing cover (41). A top cover (47) is fixedly connected to the top of the detection cylinder (46) through several connecting rods. A top spring (48) is fixedly connected to the bottom of the top cover (47). A slider (49) is fixedly connected to the bottom end of the top spring (48). The slider (49) is slidably connected to the inside of the detection cylinder (46). A trigger spring (411) is installed on the inner wall of the detection cylinder (46). A buzzer (410) is installed on the outer side of the detection cylinder (46). The buzzer (410) is electrically connected to the trigger spring (411). The trigger spring (411) is located on the lower side of the slider (49).

3. A leak-proof hydraulic cylinder according to claim 2, characterized in that: The slider (49) has a wedge-shaped groove on one side wall above the trigger spring (411) that cooperates with the trigger spring (411).

4. A leak-proof hydraulic cylinder according to claim 1, characterized in that: Several adjusting screws (44) are installed on the front side wall of the pressure plate (42), and the adjusting screws (44) penetrate the front side wall of the sealing cover (41).

5. A leak-proof hydraulic cylinder according to claim 4, characterized in that: The front section of the adjusting screw (44) is elliptical, and the front half of the front section of the adjusting screw (44) is rotatably connected to the rear half of the front section.

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