A three-stage telescopic cylinder

Abstract

The utility model provides a three-stage telescopic oil cylinder, which belongs to the technical field of telescopic oil cylinders. It includes a cylinder barrel and a return mechanism, wherein a piston rod is arranged inside the cylinder barrel, and the return mechanism includes a cavity, wherein a cavity is arranged inside the cylinder barrel, and an air inlet hole is opened on the inner wall of the cavity, and a connecting rod is slidably installed inside the cavity, and an annular plate is fixedly connected to the outer surface of the cylinder barrel, and a connecting rope is movably installed on the upper surface of the annular plate. A cavity is arranged inside the cylinder barrel, and a connecting rod is slidably installed inside the cavity, and an air inlet hole is arranged on the outer surface of the cylinder barrel, and a small air pump is installed outside the cylinder barrel, and the air inside the cavity is extracted by the small air pump to reduce the air pressure inside the cavity, so that the connecting rod is pressed into the interior of the cavity by the external atmospheric pressure, and the three piston rods are driven to move back to the initial position, which is convenient for storage, and effectively replaces the manual pressing method, saving time and labor, and is convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic oil cylinders, in particular to a three-stage telescopic oil cylinder. Background Art

[0002] Telescopic cylinder is a kind of hydraulic cylinder. Telescopic cylinder is used in many fields, such as automobile, construction, machinery and other fields. The telescopic cylinder is used to prop up objects so that the objects can be lifted into the air, which is convenient for their inspection and maintenance. Telescopic cylinder is mostly used to support heavy objects to meet the needs of use.

[0003] There are many types of telescopic cylinders, including single-piston rod, double-piston rod and triple-piston rod types. Different types of telescopic cylinders are used in different usage environments. When the telescopic cylinder is in use, hydraulic oil is introduced into the interior of the telescopic cylinder. Through the continuous input of hydraulic oil, the piston rod can be extended, and the extension of the first-stage piston rod, the second-stage piston rod and the third-stage piston rod are controlled in turn to lift the object and meet the needs of use.

[0004] Although the above method can be used normally for the telescopic cylinder, in actual use, the piston rod is lifted up by hydraulic oil. Due to the large damping force between the piston rods, after use, even if the internal hydraulic pressure is discharged, the piston rod will not move down naturally. It is necessary to manually use a large force to press the piston rod downward to move the piston rod downward, which is time-consuming and labor-intensive and affects use. Therefore, we propose a three-stage telescopic cylinder to solve the above problem. Utility Model Content

[0005] In order to make up for the above deficiencies, the utility model provides a three-stage telescopic oil cylinder that overcomes the above technical problems or at least partially solves the above problems.

[0006] The utility model is achieved in this way:

[0007] The utility model provides a three-stage telescopic oil cylinder, comprising a cylinder barrel, a piston rod is arranged inside the cylinder barrel, a positioning mechanism is installed on the cylinder barrel, the positioning mechanism comprises a vertical plate, a plug rod and a positioning hole, the top of the cylinder barrel is fixedly connected to the vertical plate, the inside of the vertical plate is slidably connected to the plug rod, one end of the plug rod is fixedly connected to a baffle, a limit plate is slidably installed outside the plug rod, a plurality of positioning holes are opened on the outer surface of the connecting rod, and the positioning holes are evenly arranged on the outer surface of the connecting rod, and the plug rod is plugged into the inside of the positioning hole;

[0008] A return mechanism, the return mechanism comprising:

[0009] A cavity, wherein the cylinder is provided with a cavity, an air inlet hole is provided on the inner wall of the cavity, and a connecting rod is slidably installed inside the cavity;

[0010] A sealing plug, the outer surface of the cylinder is fixedly connected to an annular plate, a connecting rope is movably installed on the upper surface of the annular plate, one end of the connecting rope is movably connected to the sealing plug, and the sealing plug is plugged into the inside of the air inlet;

[0011] A small air pump is installed on the outside of a cylinder, an air intake pipe is fixedly installed on the air intake end of the cylinder, and the air intake pipe is arranged inside a cavity.

[0012] In a preferred embodiment, the cylinder is internally slidably connected to a piston rod, the piston rod includes a primary piston rod, the primary piston rod is internally slidably connected to a secondary piston rod, and the secondary piston rod is internally slidably connected to a tertiary piston rod.

[0013] In a preferred embodiment, a partition is fixedly installed inside the cylinder, one end of the primary piston rod is arranged on the inner side of the partition, the interior of the primary piston rod is connected to the inner side of the partition, and the interior of the secondary piston rod is connected to the interior of the primary piston rod.

[0014] In a preferred embodiment, the top of the three-stage piston rod is fixedly connected to a circular plate, one end of the connecting rod is fixedly connected to the circular plate, the other end of the connecting rod is arranged inside the cavity and fixedly connected to a sealing plate, and the sealing plate is slidably arranged inside the cavity.

[0015] In a preferred solution, an oil inlet pipe is fixedly mounted on the outer surface of the cylinder, one end of the oil inlet pipe is arranged at a position inside the partition, and a control valve is installed on the oil inlet pipe.

[0016] The utility model provides a three-stage telescopic oil cylinder, and its beneficial effects include:

[0017] 1. A cavity is provided inside the cylinder, and a connecting rod is slidably installed inside the cavity. At the same time, an air inlet is provided on the outer surface of the cylinder, and a small air pump is installed outside the cylinder. When there is no need to control the piston rod to move back, the air inlet is used to open the pile body. When the piston rod needs to be controlled to move back, the air inlet is closed, and the air inside the cavity is extracted by the small air pump to reduce the air pressure inside the cavity, so that the connecting rod can be pressed into the cavity by the external atmospheric pressure, and the three piston rods can be driven to move back to the initial position, which is convenient for storage and effectively replaces the manual pressing method, saving time and effort and being convenient to use.

[0018] 2. A vertical rod is installed through the top of the cylinder, and a plug-in rod is slidably installed inside the vertical plate. At the same time, a positioning hole is opened on the outside of the connecting rod. By inserting the plug-in rod into the inside of the positioning hole, the connecting rod can be positioned, thereby preventing the three piston rods from moving back when an accident occurs during use of the device, and keeping them in an extended state to support the object, avoiding danger and meeting the requirements of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the position of the air inlet of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the cylinder of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the plug-in rod of the utility model;

[0024] In the figure: 1. cylinder barrel; 2. piston rod; 3. return mechanism; 31. cavity; 311. air inlet hole; 312. connecting rod; 32. sealing plug; 321. annular plate; 322. connecting rope; 33. small vacuum pump; 331. air inlet pipe; 4. primary piston rod; 5. secondary piston rod; 6. tertiary piston rod; 7. partition; 8. round plate; 9. sealing plate; 10. oil inlet pipe; 11. control valve; 12. positioning mechanism; 121. vertical plate; 122. plug-in rod; 123. positioning hole; 13. baffle; 14. limit plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example

[0027] Reference Figure 1-Figure 4The utility model provides a technical solution: a three-stage telescopic oil cylinder, including a cylinder barrel 1 and a return mechanism 3, a piston rod 2 is arranged inside the cylinder barrel 1, the return mechanism 3 includes a cavity 31, a cavity 31 is arranged inside the cylinder barrel 1, an air inlet hole 311 is opened on the inner wall of the cavity 31, a connecting rod 312 is slidably installed inside the cavity 31, an annular plate 321 is fixedly connected to the outer surface of the cylinder barrel 1, a connecting rope 322 is movably installed on the upper surface of the annular plate 321, one end of the connecting rope 322 is movably connected to a sealing plug 32, the sealing plug 32 is plugged into the inside of the air inlet hole 311, a small vacuum pump 33 is installed on the outside of the cylinder barrel 1, an air inlet pipe 331 is fixedly installed on the air inlet end of the cylinder barrel 1, and the air inlet pipe 331 is arranged inside the cavity 31.

[0028] In a preferred embodiment, the cylinder 1 is internally slidably connected to a piston rod 2, the piston rod 2 includes a primary piston rod 4, the primary piston rod 4 is internally slidably connected to a secondary piston rod 5, the secondary piston rod 5 is internally slidably connected to a tertiary piston rod 6. The device is provided with three-stage telescopic function to increase the supporting height of the object to meet the use requirements, and the three piston rods are arranged to slide in pairs for easy telescopic function.

[0029] In a preferred embodiment, a partition 7 is fixedly installed inside the cylinder 1, one end of the first-stage piston rod 4 is arranged on the inner side of the partition 7, the interior of the first-stage piston rod 4 is connected to the inner side of the partition 7, and the interior of the second-stage piston rod 5 is connected to the interior of the first-stage piston rod 4. In order to facilitate the extension of the three piston rods, the device will deliver the hydraulic oil to the inside of the cylinder 1. In order to prevent the hydraulic oil from entering the cavity 31, a partition 7 is provided inside the cylinder 1 to separate the hydraulic oil from the cavity 31. The hydraulic oil is delivered to the inside of the partition 7. As the hydraulic oil continues to increase, the three piston rods will be pushed out to lift the object for easy use.

[0030] In a preferred embodiment, the top of the tertiary piston rod 6 is fixedly connected to the circular plate 8, one end of the connecting rod 312 is fixedly connected to the circular plate 8, and the other end of the connecting rod 312 is arranged inside the cavity 31 and fixedly connected to the sealing plate 9. The sealing plate 9 is slidably arranged inside the cavity 31. The device slidably connects the connecting rod 312 with the inside of the cylinder 1. In order to prevent external air from entering the cavity 31 from the connection between the connecting rod 312 and the cylinder 1 and affecting subsequent operations, a sealing plate 9 is installed at the bottom of the connecting rod 312. During operation, the upward movement of the tertiary piston rod 6 will drive the connecting rod 312 to move upward, and the sealing plate 9 and the inner top of the cavity 31 are sealed to prevent external air from entering the cavity 31 from the connection position, thereby ensuring that when the piston rod is subsequently controlled to move downward, the air pressure inside the cavity 31 will be reduced.

[0031] In order to facilitate the delivery of hydraulic oil to the interior of the cylinder 1, an oil inlet pipe 10 is fixedly installed on the outer surface of the cylinder 1, and one end of the oil inlet pipe 10 is arranged at a position inside the partition 7. A control valve 11 is installed on the oil inlet pipe 10, and one end of the oil inlet pipe 10 is arranged at a position inside the partition 7. The connection between the oil inlet pipe 10 and the cylinder 1 is a sealed connection. At the same time, the oil inlet pipe 10 extending outside the cylinder 1 can be connected to an external oil pipe, which facilitates the delivery of hydraulic oil to the interior of the cylinder 1 and is easy to use.

[0032] When the device is in the process of lifting an object, if an accident occurs, the three piston rods will retract under the pressure of the object, causing the person at the bottom of the object to be crushed by the object, posing a danger to the maintenance personnel. To solve this problem, a positioning mechanism 12 is installed on the cylinder 1, and the positioning mechanism 12 includes a vertical plate 121, a plug rod 122 and a positioning hole 123. The top of the cylinder 1 is fixedly connected to the vertical plate 121, the inside of the vertical plate 121 is slidably connected to the plug rod 122, one end of the plug rod 122 is fixedly connected to the baffle 13, and the outside of the plug rod 122 is slidably installed with a limit plate 14. A plurality of positioning holes 123 are opened on the outer surface of the connecting rod 312, and are evenly arranged on the outer surface of the connecting rod 312, and the plug rod 122 is inserted into the inside of the positioning hole 123.

[0033] In actual operation, by controlling the tertiary piston rod 6, the secondary piston rod 5 and the primary piston rod 4 to extend from the inside of the cylinder 1 and drive the connecting rod 312 to move upward, after determining the position of the tertiary piston rod 6, the connecting rod 122 is inserted into the inside of the connecting rod 312 to position the connecting rod 312. The connecting rod 312 will not move downward, and the tertiary piston rod 6 will be controlled to be unable to move downward. This can prevent the tertiary piston rod 6 from being compressed in the event of an error, and will not control the primary piston rod 4 and the secondary piston rod 5 to move downward, thereby ensuring the safety of the staff and satisfying the use.

[0034] Specifically, the working process or working principle of a three-stage telescopic cylinder is as follows: there are many types of telescopic cylinders, including single-piston rod, double-piston rod and triple-piston rod types. Different types of telescopic cylinders will be used in different usage environments. When the telescopic cylinder is in use, hydraulic oil is introduced into the interior of the telescopic cylinder. Through the continuous input of hydraulic oil, the piston rod can be extended, and the first-stage piston rod 4, the second-stage piston rod 5 and the third-stage piston rod 6 are controlled to extend in turn, so as to prop up the object and meet the usage requirements.

[0035] Although the above method can be used normally for the telescopic cylinder, in actual use, the piston rod 2 is lifted up by the hydraulic oil. Since the damping force between the piston rod 2 is large, after use, even if the internal hydraulic pressure is discharged, the piston rod 2 will not move down naturally. It is necessary to manually use a large force to press the piston rod 2 downward to move the piston rod 2 downward, which is time-consuming and labor-intensive and affects use. Therefore, this device is designed to solve this problem.

[0036] When using the device, not only the external inlet pipe is connected, but also the external power supply is required. By adding hydraulic oil into the cylinder 1, as the hydraulic oil continues to increase, the tertiary piston rod 6 will be pushed to move. When the tertiary piston rod 6 is fully extended, the secondary piston rod 5 will continue to be controlled to extend, thereby continuing to control the movement of the tertiary piston rod 6. Similarly, the movement of the primary piston rod 4 will push the secondary piston rod 5 and the tertiary piston rod 6 to move, and the circular plate 8 at the end of the tertiary piston rod 6 will be used to lift the object so that the object can be inspected or maintained.

[0037] When the device is used normally, hydraulic pressure will be continuously delivered to the inside of the cylinder 1. After use, the delivery of hydraulic oil will be stopped. At the same time, the hydraulic oil in the cylinder 1 will be discharged, and the device will be moved out from under the object. Since the damping force between the piston rods is large, when the hydraulic oil in the cylinder 1 is discharged, the three piston rods will not fall automatically. They need to be pressed to control the three piston rods to return to their initial positions. In order to facilitate the control of the return of the three pistons, the device adopts the method of air pressure difference to make them return to their initial positions.

[0038] When the device is in use, the air inlet 311 is in an open state. When the three piston rods are controlled to move downward, the sealing plug 32 is used to plug the inside of the air inlet 311 to prevent the outside air from entering the inside of the cavity 31. Then the small vacuum pump 33 is turned on to extract the gas inside the cavity 31, so that the air pressure inside the cavity 31 is reduced. The air pressure inside the cavity 31 is lower than the outside air pressure. At this time, the circular plate 8 connected to the connecting rod 312 will be pressed downward by the outside atmospheric pressure, so that the connecting rod 312 is pressed into the inside of the cavity 31. At this time, the tertiary piston rod 6 will also move downward passively, and then drive the secondary piston rod 5 and the primary piston rod 4 to move downward in sequence, and restore the three piston rods 6 to their initial positions, so that the storage of the three piston rods can be completed.

[0039] When the device is in use, in order to improve stability, after adjusting the position of the rear three-stage piston rod 6, the plug-in rod 122 is controlled to extend into the interior of the connecting rod 312 to position the connecting rod 312. Even if an accident occurs during use, the three piston rods will not move downward under the action of the plug-in rod 122, thereby enabling the device to be used stably and improving the use effect.

[0040] It should be noted that the small vacuum pump 33 is a device or equipment existing in the prior art, or a device or equipment that can be realized in the prior art. Its power supply, specific composition and principle are clear to those skilled in the art, so they are not described in detail.

Claims

1. A three-stage telescopic cylinder, characterized in that: It comprises a cylinder (1), wherein a piston rod (2) is arranged inside the cylinder (1); A return mechanism (3), the return mechanism (3) comprising: A cavity (31), wherein the cylinder barrel (1) is provided with a cavity (31), an inner wall of the cavity (31) is provided with an air inlet hole (311), and a connecting rod (312) is slidably mounted inside the cavity (31); A sealing plug (32), the outer surface of the cylinder (1) is fixedly connected to an annular plate (321), a connecting rope (322) is movably installed on the upper surface of the annular plate (321), one end of the connecting rope (322) is movably connected to the sealing plug (32), and the sealing plug (32) is plugged into the inside of the air inlet (311); A small air pump (33) is installed outside the cylinder (1); an air intake pipe (331) is fixedly installed at the air intake end of the cylinder (1); and the air intake pipe (331) is arranged inside the cavity (31).

2. A three-stage telescopic cylinder according to claim 1, characterized in that: The cylinder barrel (1) is internally slidably connected to a piston rod (2), the piston rod (2) includes a primary piston rod (4), the primary piston rod (4) is internally slidably connected to a secondary piston rod (5), and the secondary piston rod (5) is internally slidably connected to a tertiary piston rod (6).

3. A three-stage telescopic cylinder according to claim 2, characterized in that: A partition (7) is fixedly installed inside the cylinder (1), one end of the primary piston rod (4) is arranged on the inner side of the partition (7), the interior of the primary piston rod (4) is connected to the inner side of the partition (7), and the interior of the secondary piston rod (5) is connected to the interior of the primary piston rod (4).

4. A three-stage telescopic cylinder according to claim 2, characterized in that: The top of the three-stage piston rod (6) is fixedly connected to the circular plate (8), one end of the connecting rod (312) is fixedly connected to the circular plate (8), the other end of the connecting rod (312) is arranged inside the cavity (31) and fixedly connected to the sealing plate (9), and the sealing plate (9) is slidably arranged inside the cavity (31).

5. A three-stage telescopic oil cylinder according to claim 3, characterized in that: An oil inlet pipe (10) is fixedly mounted on the outer surface of the cylinder barrel (1), one end of the oil inlet pipe (10) is arranged at a position inside the partition (7), and a control valve (11) is mounted on the oil inlet pipe (10).

6. A three-stage telescopic cylinder according to claim 1, characterized in that: A positioning mechanism (12) is installed on the cylinder barrel (1), and the positioning mechanism (12) comprises a vertical plate (121), a plug-in rod (122) and a positioning hole (123).

7. A three-stage telescopic oil cylinder according to claim 6, characterized in that: The top of the cylinder (1) is fixedly connected to a vertical plate (121), the interior of the vertical plate (121) is slidably connected to a plug-in rod (122), one end of the plug-in rod (122) is fixedly connected to a baffle (13), and the exterior of the plug-in rod (122) is slidably mounted with a limiting plate (14).

8. A three-stage telescopic oil cylinder according to claim 7, characterized in that: The outer surface of the connecting rod (312) is provided with a plurality of positioning holes (123) which are evenly arranged on the outer surface of the connecting rod (312), and the plug-in rod (122) is plugged into the interior of the positioning holes (123).

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