Split type grease injection cylinder

Abstract

The utility model belongs to grease injection device technical field relates to a split type grease injection cylinder, including grease injection cylinder mechanism, booster cylinder mechanism. The utility model mainly includes grease injection cylinder mechanism and booster cylinder mechanism, and the grease injection cylinder mechanism no longer has booster function, so the volume is reduced, and the both side -by -side connection reduces the length of this device, and the booster cylinder mechanism is responsible for the normal pressure oil pressurization, and the design booster cylinder volume is less than the grease injection cylinder volume, and the lubricating grease in the grease injection cylinder mechanism is discharged a part every time to normal pressure oil pressurization, and the total grease injection amount is satisfied through many times of grease injection.

Description

Technical Field

[0001] This utility model belongs to the technical field of grease injection devices and relates to a split-type grease injection cylinder. Background Technology

[0002] In petrochemical, oil and gas, steel, and shipbuilding equipment, greases and other grease-based materials are commonly used. These greases require injection via a pressurized grease injection cylinder. Application CN202123071197.2 discloses a grease injection pressurized cylinder and grease injection machine. In its technical solution, the grease injection pressurized cylinder includes a low-pressure cylinder and a high-pressure cylinder. A piston is installed inside the grease injection pressurized cylinder, with one end in the high-pressure cylinder and the other end in the low-pressure cylinder. By injecting hydraulic oil into the low-pressure cylinder to drive the piston to move, the grease material in the high-pressure cylinder can be squeezed out from the grease injection port on the front end cover. This application integrates the hydraulic piston and the grease injection cylinder piston, connecting the grease injection cylinder and the hydraulic cylinder in series. Its total length is at least twice its effective stroke, that is, the sum of the grease injection cylinder piston stroke and the hydraulic piston stroke, resulting in a large piston length and a large overall equipment length. Furthermore, in order to achieve the pressurization function, the area of ​​the hydraulic piston must be larger than that of the grease injection cylinder piston (usually 3 to 4 times), resulting in a larger overall diameter of the product, increased processing difficulty, and increased cost. Summary of the Invention

[0003] This invention addresses the problem of the large size of existing grease injection cylinders by designing a smaller, split-type grease injection cylinder.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a split-type grease injection cylinder, including a grease injection cylinder mechanism and a pressure cylinder mechanism; The grease injection cylinder mechanism includes a grease injection cylinder body, an upper grease injection cylinder cover threaded to the upper end of the grease injection cylinder body, a lower grease injection cylinder cover screwed to the lower end of the grease injection cylinder body, a grease injection cylinder piston disposed inside the grease injection cylinder body, and a grease injection port opened on the upper side of the grease injection cylinder body. The booster cylinder mechanism includes a booster cylinder body. The booster cylinder body is connected to an upper cylinder cover and a lower cylinder cover by screws at both ends. A variable diameter piston is provided inside the booster cylinder body. The area between the variable diameter piston and the upper cylinder cover is set as a normal pressure oil chamber, and the area between the variable diameter piston and the lower cylinder cover is set as a high pressure oil chamber. The upper diameter of the variable diameter piston is 3 to 4 times the lower diameter of the variable diameter piston. The upper cylinder cover of the booster cylinder is provided with a hydraulic oil port for the booster cylinder, and a three-way oil passage connects the lower cylinder cover of the booster cylinder to the lower part of the grease injection cylinder body.

[0005] Preferably, a magnetostrictive sensor is installed above the cylinder head of the booster cylinder. The magnetostrictive sensor includes a waveguide. The variable-diameter piston is provided with an upward-facing blind hole. The lower end of the waveguide passes through the cylinder head of the booster cylinder and is inserted into the blind hole. A magnetic ring is sleeved on the waveguide and is fixedly connected to the variable-diameter piston.

[0006] Preferably, the system also includes an automatic reset mechanism, which includes an upper cylinder cover for a grease injection cylinder. The upper cylinder cover has a through hole, and a cap is fixedly connected to the upper end of the through hole. The cap has a reset oil injection port. A first-stage piston cylinder is fitted inside the through hole. A second-stage piston cylinder is fitted inside the first-stage piston cylinder. A third-stage piston rod is fitted inside the second-stage piston cylinder.

[0007] Preferably, the through hole, the first-stage piston cylinder, and the second-stage piston cylinder are all connected to the reset oil inlet.

[0008] Preferably, the booster cylinder body is connected to the side of the grease injection cylinder body.

[0009] Preferably, the system also includes a hydraulic control circuit, which includes an oil pipe, a solenoid directional valve, a relief valve, an oil pump, an oil tank, and a controller.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model mainly includes a grease injection cylinder mechanism and a booster cylinder mechanism. The grease injection cylinder mechanism itself no longer has a booster function, so its volume is reduced. Moreover, the two are connected side by side, reducing the length of the device. The booster cylinder mechanism is responsible for boosting the atmospheric pressure oil. The booster cylinder is designed to have a volume smaller than the grease injection cylinder. Each time the atmospheric pressure oil is boosted, a portion of the lubricating grease in the grease injection cylinder mechanism is discharged. The total grease injection volume is met through multiple grease injections. A hydraulic control oil circuit is also provided to control the automatic cyclic grease injection of the grease injection cylinder mechanism and the booster cylinder mechanism.

[0011] This invention features an automatic reset mechanism. Under the control of the hydraulic control circuit, atmospheric pressure oil is injected into the reset port, preventing it from entering the grease injection cylinder. This oil pushes the third-stage piston rod, second-stage piston cylinder, and first-stage piston cylinder to move, thereby pushing the grease injection cylinder piston at the upper end of the cylinder downwards. This ensures sufficient space above the piston to accommodate lubricating grease, eliminating the need for manual resetting of the piston. Furthermore, after the piston resets, the injection of atmospheric pressure oil into the reset port ceases, and the oil in the automatic reset mechanism flows back to the oil tank. When the piston moves upwards, it pushes the third-stage piston rod, second-stage piston cylinder, and first-stage piston cylinder upwards. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of Example 1; Figure 2 This is a schematic diagram of the structure of Example 2; Figure 3 This is a schematic diagram of the structure of Example 3; Figure 4 This is a schematic diagram of the structure of Example 5.

[0014] In the above figures, 1. Grease injection cylinder mechanism; 11. Grease injection cylinder body; 12. Grease injection cylinder upper cylinder cover; 13. Grease injection cylinder lower cylinder cover; 14. Grease injection cylinder piston; 15. Grease injection port; 2. Intensifier cylinder mechanism; 21. Intensifier cylinder body; 22. Intensifier cylinder upper cylinder cover; 221. Through hole; 23. Intensifier cylinder lower cylinder cover; 24. Variable diameter piston; 25. Normal pressure oil chamber; 26. High pressure oil chamber; 27. Intensifier cylinder hydraulic oil port; 3. Three-way oil circuit; 4. Magnetostrictive sensor; 41. Waveguide; 42. Magnetic ring; 5. Automatic reset mechanism; 51. Sealing cap; 52. Reset oil injection port; 53. First stage piston cylinder; 54. Second stage piston cylinder; 55. Third stage piston rod; 6. Hydraulic control oil circuit; 61. Solenoid directional valve; 62. Overflow valve; 63. Oil pump; 64. Oil tank; 65. Controller. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] like Figures 1-4 As shown; Example 1 A split-type grease injection cylinder includes a grease injection cylinder mechanism 1 and a pressure boosting cylinder mechanism 2; The grease injection cylinder mechanism 1 includes a grease injection cylinder body 11. The upper end of the grease injection cylinder body 11 is threadedly connected to a grease injection cylinder upper cover 12. By unscrewing and opening the grease injection cylinder upper cover 12, lubricating grease can be added into the grease injection cylinder body 11. The lower end of the grease injection cylinder body 11 is connected to a grease injection cylinder lower cover 13 by screws. A grease injection cylinder piston 14 is provided inside the grease injection cylinder body 11, and a grease injection port 15 is opened on the upper side of the grease injection cylinder body 11. When the grease injection cylinder piston 14 moves upward, it squeezes the lubricating grease inside the grease injection cylinder body 11, so that the internal pressure of the grease injection cylinder body 11 is greater than the internal pressure of the equipment, so that the lubricating grease can be discharged from the grease injection port 15. The grease injection port 15 is used to connect to the equipment that needs grease injection. The booster cylinder mechanism 2 includes a booster cylinder body 21. The two ends of the booster cylinder body 21 are connected to the upper cylinder cover 22 and the lower cylinder cover 23 by screws. A variable diameter piston 24 is provided inside the booster cylinder body 21. The upper and lower ends of the variable diameter piston 24 are sealed to the inner wall of the booster cylinder body 21. The area between the variable diameter piston 24 and the upper cylinder cover 22 is set as a normal pressure oil chamber 25, and the area between the variable diameter piston 24 and the lower cylinder cover 23 is set as a high pressure oil chamber 26. The diameter of the upper end of the variable diameter piston 24 is 3 to 4 times the diameter of the lower end of the variable diameter piston 24. The upper cylinder cover 22 of the booster cylinder is provided with a booster cylinder hydraulic oil port 27. Normal pressure oil is injected from the booster cylinder hydraulic oil port 27 to push the variable diameter piston 24 to move. The lower cylinder cover 23 of the booster cylinder is connected to the lower part of the grease injection cylinder body 11 by a three-way oil passage 3. The other oil port of the three-way oil passage 3 is connected to a solenoid reversing valve, that is, the solenoid reversing valve controls the injection / return of oil into the high pressure oil chamber and the space below the piston of the grease injection cylinder.

[0018] Example 1: Circulatory grease injection procedure: Step 1: Unscrew the upper cylinder cover 12 of the grease injection cylinder, add lubricating grease into the cylinder body 11 of the grease injection cylinder, and then tighten the upper cylinder cover 12 of the grease injection cylinder to expel the air mixed into the cylinder body 11 of the grease injection cylinder when adding grease (the existing technology will not be described in detail). Step 2: The electromagnetic reversing valve connects to the oil pump via the three-way oil circuit 3, thereby injecting normal pressure oil into the high-pressure oil chamber and the space below the piston of the grease injection cylinder. This pushes the variable diameter piston 24 to the upper end of the booster cylinder body 21 and prevents it from moving further upward. Since lubricating grease has been injected into the upper part of the grease injection cylinder body 11, whether the piston of the grease injection cylinder moves and the direction of movement depends on the pressure on both sides.

[0019] Step 3: The electromagnetic reversing valve closes the passage between the three-way oil circuit 3 and the oil pump, that is, it no longer injects normal pressure oil into the high pressure oil chamber and the space below the piston of the grease injection cylinder, and only keeps the lower part of the booster cylinder body 21 connected to the lower part of the grease injection cylinder body 11.

[0020] Step 4: Inject atmospheric pressure oil into the upper part of the booster cylinder body 21. Since the upper diameter of the variable diameter piston 24 is larger than the lower diameter, it pushes the variable diameter piston 24 to move downward. The high pressure oil (the atmospheric pressure oil is compressed and the pressure increases) in the lower part of the booster cylinder body 21 flows into the lower part of the grease injection cylinder body 11, which in turn pushes the grease injection cylinder piston to move upward. When the pressure of the lubricating grease is greater than the internal pressure of the equipment, the lubricating grease flows into the equipment from the grease injection port 15.

[0021] Step 5: When the variable diameter piston 24 reaches the end of its stroke and can no longer move downwards, the solenoid directional valve controls the three-way oil circuit 3 to connect with the oil tank, so that the high pressure oil in the high pressure oil chamber and the space below the variable diameter piston 24 flows back to the oil tank where the oil pressure is lower.

[0022] Step 6: Detect the lubricating grease content. If it is greater than the preset value, proceed to Step 2; if it is less than the preset value, proceed to Step 1.

[0023] Each step is performed in sequence.

[0024] Example 2 A magnetostrictive sensor 4 is installed above the cylinder head 22 of the booster cylinder. The magnetostrictive sensor 4 includes a waveguide 41, an electronic compartment, and a magnetic ring 42. The variable-diameter piston 24 has an upward-facing blind hole. The lower end of the waveguide 41 passes through the cylinder head and is inserted into the blind hole. The magnetic ring 42 is fitted onto the waveguide 41 and is fixedly connected to the variable-diameter piston 24, meaning the variable-diameter piston 24 can drive the magnetic ring 42 to move. The detection principle of the magnetostrictive sensor 4 is existing technology and will not be described further here. The displacement of the variable-diameter piston 24 is detected by the magnetostrictive sensor 4. The controller 65 converts the displacement to obtain the change in lubricating grease, thereby monitoring the lubricating grease content in the grease injection cylinder body 11. Furthermore, since the cylinder head 22 of the booster cylinder also houses the magnetostrictive sensor 4 and the hydraulic oil port 27 of the booster cylinder, the magnetostrictive sensor 4 is positioned at the center of the cylinder head 22, while the hydraulic oil port 27 is positioned off-center.

[0025] Example 3 Furthermore, it also includes an automatic reset mechanism 5, which includes an upper cylinder cover 12 of the grease injection cylinder. The upper cylinder cover 12 of the grease injection cylinder is provided with a through hole 221. A cover 51 is fixedly connected to the upper end of the through hole 221, and the cover 51 blocks the upper end of the through hole 221. A reset oil injection port 52 is provided on the cover 51. A first-stage piston cylinder 53 is sleeved inside the through hole 221. The first-stage piston cylinder 53 cannot pass through the lower end of the through hole 221. A second-stage piston cylinder 54 is sleeved inside the first-stage piston cylinder 53. The second-stage piston cylinder 54 cannot pass through the lower end of the first-stage piston cylinder 53. A third-stage piston rod 55 is sleeved inside the second-stage piston cylinder 54. The third-stage piston rod 55 cannot pass through the lower end of the second-stage piston cylinder 54. The upper end of the first-stage piston cylinder 53 is sealed with the inner wall of the through hole 221. The upper end of the second-stage piston cylinder 54 is sealed with the inner wall of the first-stage piston cylinder 53. The upper end of the third-stage piston rod 55 is sealed with the inner wall of the second-stage piston cylinder 54.

[0026] Furthermore, the through hole 221, the first-stage piston cylinder 53, and the second-stage piston cylinder 54 are all connected to the reset oil inlet 52.

[0027] Working principle of automatic reset mechanism 5: Due to repeated grease injection, the piston of the grease injection cylinder moves to the upper end of the grease injection cylinder body 11, making it impossible to hold enough lubricating grease above the piston. Therefore, before performing step one, atmospheric pressure oil is injected into the reset oil inlet 52. The atmospheric pressure oil first pushes the third-stage piston rod 55 downward, and then drives the second-stage piston cylinder 54 and the first-stage piston cylinder 53 to move, so that the stroke of the third-stage piston rod 55 is greater than its own length. The third-stage piston rod 55 pushes the grease injection cylinder piston to the lower end of the grease injection cylinder body 11, and discharges the low-pressure oil below the grease injection cylinder piston from the three-way oil passage 3.

[0028] Example 4 Furthermore, the booster cylinder body 21 is connected to the side of the grease injection cylinder body 11, achieving a lateral expansion of the entire device while reducing its longitudinal length. Also, the volume of the booster cylinder body 21 is smaller than that of the grease injection cylinder body 11, allowing for multiple grease injections to achieve the total grease injection volume, thus reducing the amount of grease injected per injection and further decreasing the overall size of the device.

[0029] Example 5 Furthermore, this utility model also includes a hydraulic control circuit 6, which includes an oil pipe, a solenoid directional valve 61, a relief valve 62, an oil pump 63, an oil tank 64, and a controller 65. The controller 65 is used to receive information from the magnetostrictive sensor 4 and to control the operation of the solenoid directional valve 61 and the oil pump 63. The oil pump 63 draws oil from the oil tank 64 and outputs atmospheric pressure oil at a pressure of 15MPa~25MPa to realize the injection of atmospheric pressure oil in the above-mentioned circulating grease injection process. The relief valve 62 is indirectly connected to the oil pump 63 through the oil circuit, and the solenoid directional valve 61 controls the oil circuit connection to realize the connection between the oil pump 63 / oil tank 64 and the three-way oil circuit 3, the connection between the oil pump 63 / oil tank 64 and the atmospheric pressure oil chamber, and the connection between the oil pump 63 / oil tank 64 and the reset oil inlet 52, so as to realize the injection of oil / oil return in the above steps.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A split grease injection cylinder, characterized by, Including grease injection cylinder mechanism and pressure boosting cylinder mechanism; The grease injection cylinder mechanism includes a grease injection cylinder body, an upper grease injection cylinder cover threaded to the upper end of the grease injection cylinder body, a lower grease injection cylinder cover screwed to the lower end of the grease injection cylinder body, a grease injection cylinder piston disposed inside the grease injection cylinder body, and a grease injection port opened on the upper side of the grease injection cylinder body. The booster cylinder mechanism includes a booster cylinder body. The booster cylinder body is connected to an upper cylinder cover and a lower cylinder cover by screws at both ends. A variable diameter piston is provided inside the booster cylinder body. The area between the variable diameter piston and the upper cylinder cover is set as a normal pressure oil chamber, and the area between the variable diameter piston and the lower cylinder cover is set as a high pressure oil chamber. The upper diameter of the variable diameter piston is 3 to 4 times the lower diameter of the variable diameter piston. The upper cylinder cover of the booster cylinder is provided with a hydraulic oil port for the booster cylinder, and a three-way oil passage connects the lower cylinder cover of the booster cylinder to the lower part of the grease injection cylinder body.

2. The split grease injection cylinder of claim 1, wherein, A magnetostrictive sensor is installed above the cylinder head of the booster cylinder. The magnetostrictive sensor includes a waveguide. The variable diameter piston is provided with an upward-facing blind hole. The lower end of the waveguide passes through the cylinder head of the booster cylinder and is inserted into the blind hole. A magnetic ring is sleeved on the waveguide and is fixedly connected to the variable diameter piston.

3. The split grease injection cylinder of claim 1, wherein, It also includes an automatic reset mechanism, which includes an upper cylinder cover for a grease injection cylinder. The upper cylinder cover for the grease injection cylinder has a through hole. A cover is fixedly connected to the upper end of the through hole. A reset oil injection port is provided on the cover. A first-stage piston cylinder is sleeved inside the through hole. A second-stage piston cylinder is sleeved inside the first-stage piston cylinder. A third-stage piston rod is sleeved inside the second-stage piston cylinder.

4. The split grease injection cylinder of claim 3, wherein, The through hole, the first-stage piston cylinder, and the second-stage piston cylinder are all connected to the reset oil inlet.

5. The split grease injection cylinder of claim 1, wherein, The booster cylinder body is connected to the side of the grease injection cylinder body.

6. The split grease injection cylinder of any one of claims 1-5, wherein, It also includes a hydraulic control circuit, which includes oil pipes, a solenoid directional valve, a relief valve, an oil pump, an oil tank, and a controller.

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