Automatic oil supplementing and oil way control device for internal leakage of hydraulic cylinder

Abstract

The utility model discloses an automatic oil supplementing and oil way control device for internal leakage of a hydraulic cylinder. The automatic oil supplementing and oil way control device comprises a plunger pump and a hydraulic cylinder device, one end of the plunger pump is connected with a stop valve, one side of the top of the stop valve is connected with a pressure measuring connector A, the top of the stop valve is connected with a pressure gauge, the top of the pressure gauge is provided with an electromagnetic valve, and the top of the electromagnetic valve is connected with a hydraulic control one-way valve; when the hydraulic cylinder leaks internally, the pressure of the working cavity of the hydraulic cylinder cannot be reduced due to the internal leakage, and when the hydraulic cylinder leaks internally, the position of equipment cannot be changed due to the internal leakage; the design is small and exquisite, use is convenient, pressure oil can be led to a working cavity of a hydraulic cylinder through a pressure measuring point of the hydraulic valve stand for oil supplementing, no hydraulic pump needs to be additionally arranged, joints are not temporarily arranged on pipelines, and oil supplementing pressure and flow setting is flexible and can be automatically adjusted according to use requirements; the application range is wide, and the hydraulic control one-way valve can be used for locking all hydraulic cylinder equipment for guaranteeing pressure in the hydraulic cylinder stop state.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to an automatic oil replenishment and oil circuit control device for internal leakage of a hydraulic cylinder. Background Art

[0002] On some mechanical hydraulic equipment, especially some large-scale continuous automatic production lines with a large number of hydraulic cylinders and frequent movements, equipment failures often occur due to failure of the hydraulic cylinder piston ring seal and internal leakage, requiring the replacement of the hydraulic cylinder. This affects the stability and automatic operation of the production line, and in severe cases, safety accidents may occur due to leakage in the hydraulic cylinder.

[0003] At present, the existing technology is to add a hydraulically controlled one-way valve between the electromagnetic reversing valve and the hydraulic cylinder. After reaching the working position, the electromagnetic valve is powered off and then the hydraulically controlled one-way valve locks the inlet and outlet of the hydraulic cylinder, so that the hydraulic cylinder stops at the working position. However, when the hydraulic cylinder has internal leakage, it cannot automatically replenish oil, so that the hydraulic cylinder stops at the working position and cannot continue to be used; at the same time, when the internal leakage of the hydraulic cylinder cannot be solved, the pressure in the working chamber of the hydraulic cylinder will decrease due to the internal leakage, and the position will change due to the internal leakage, which is inconvenient to use. In view of this, we have introduced an automatic oil replenishment and oil circuit control device for hydraulic cylinder internal leakage. Utility Model Content

[0004] The utility model aims to provide an automatic oil replenishment and oil circuit control device for hydraulic cylinder internal leakage, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic cylinder internal leakage automatic oil replenishment and oil circuit control device, comprising: a plunger pump and a hydraulic cylinder device;

[0006] One end of the plunger pump is connected to a stop valve, one side of the top of the stop valve is connected to a pressure measuring joint A, the top of the stop valve is connected to a pressure gauge, the top of the pressure gauge is provided with a solenoid valve, the top of the solenoid valve is connected to a hydraulically controlled one-way valve, and the top of the hydraulically controlled one-way valve is provided with a hydraulic cylinder device for controlling oil.

[0007] Preferably, the hydraulic cylinder device includes a rodless chamber, a piston ring is slidably connected inside the rodless chamber, the piston ring can work inside the rodless chamber, the top of the piston ring is connected to the hydraulic cylinder rod, the interior of the hydraulic cylinder device is provided with a rod chamber located above the rodless chamber, and the hydraulic cylinder rod can work inside the rod chamber, one side of the pressure measuring joint A is connected to a hose A, one side of the hose A is connected to a throttle valve, the top of the throttle valve is connected to a pressure reducing valve, one side of the pressure reducing valve is connected to a hydraulic oil tank, a pressure measuring joint B is connected between the hydraulic cylinder device and the hydraulically controlled one-way valve, one side of the pressure measuring joint B is connected to a hose B, the pressure gauge is connected to one side of the hose B, and one end of the hose B is connected to the pressure reducing valve.

[0008] Preferably, the other side of the hydraulic cylinder device is connected to a pressure measuring joint C, one side of the pressure measuring joint C is connected to a hose C, the pressure measuring joint C and the hose C are used in cooperation to form a connection, the bottom of the hose C is connected to an overflow valve, and the bottom of the overflow valve is connected to a hydraulic oil tank.

[0009] Install an oil replenishment port on the oil inlet pipeline instead of the pressure measuring joint;

[0010] An oil drain port is installed on the oil return pipeline instead of a pressure measuring joint.

[0011] Preferably, the solenoid valve is a three-position four-way valve.

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

[0013] (1) When the hydraulic cylinder leaks internally, the pressure in the working chamber of the hydraulic cylinder will not decrease due to the internal leakage.

[0014] (2) When there is internal leakage in the hydraulic cylinder, the position of the equipment will not change due to the internal leakage.

[0015] (3) A hydraulic cylinder leakage oil replenishing device is formed by a group of oil replenishing valve stations consisting of a DN diameter hose, a throttle valve, a pressure reducing valve, and a pressure gauge, and another group of oil discharge valve stations consisting of a DN diameter hose and a relief valve.

[0016] (4) The design is compact and easy to use. The pressure measuring point of the hydraulic valve station can be used to lead the pressure oil to the working chamber of the hydraulic cylinder to replenish the oil. There is no need to equip a hydraulic pump or add a joint to the pipeline. The oil replenishment pressure and flow rate can be flexibly adjusted according to the use requirements. It has a wide range of applications and can be used for all hydraulic cylinder equipment that uses a hydraulically controlled one-way valve to lock and ensure pressure when the hydraulic cylinder is stopped. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2This is a structural schematic diagram of the oil replenishment valve station of the utility model;

[0019] Figure 3 This is a structural schematic diagram of the oil discharge valve station of the utility model;

[0020] Figure 4 It is a schematic diagram for explaining the thrust of the hydraulic cylinder of the utility model.

[0021] In the figure: 1. plunger pump; 2. stop valve; 3. pressure measuring joint A; 31. pressure measuring joint B; 32. pressure measuring joint C; 4. pressure gauge; 5. solenoid valve; 6. hydraulically controlled one-way valve; 7. hydraulic cylinder device; 8. hose A; 81. hose B; 82. hose C; 9. pressure reducing valve; 10. hydraulic oil tank; 11. overflow valve; 12. throttle valve; 13. rodless chamber; 14. piston ring; 15. rod chamber; 16. hydraulic cylinder rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-4 The utility model provides a technical solution: an automatic oil replenishment and oil circuit control device for internal leakage of a hydraulic cylinder, comprising: a plunger pump 1 and a hydraulic cylinder device 7, one end of the plunger pump 1 is connected to a stop valve 2, one side of the top of the stop valve 2 is connected to a pressure measuring joint A3, the top of the stop valve 2 is connected to a pressure gauge 4, the top of the pressure gauge 4 is provided with a solenoid valve 5, the top of the solenoid valve 5 is connected to a hydraulically controlled one-way valve 6, and the top of the hydraulically controlled one-way valve 6 is provided with a hydraulic cylinder device 7 for controlling oil.

[0024] The hydraulic cylinder device 7 includes a rodless chamber 13, a piston ring 14 is slidably connected inside the rodless chamber 13, the piston ring 14 can work inside the rodless chamber 13, the top of the piston ring 14 is connected to a hydraulic cylinder rod 16, the interior of the hydraulic cylinder device 7 is located above the rodless chamber 13 and a rod chamber 15 is opened, and the hydraulic cylinder rod 16 can work inside the rod chamber 15, one side of the pressure measuring joint A3 is connected to a hose A8, one side of the hose A8 is connected to a throttle valve 12, the top of the throttle valve 12 is connected to a pressure reducing valve 9, one side of the pressure reducing valve 9 is connected to a hydraulic oil tank 10, a pressure measuring joint B31 is connected between the hydraulic cylinder device 7 and the hydraulically controlled one-way valve 6, one side of the pressure measuring joint B31 is connected to a hose B81, the pressure gauge 4 is connected to one side of the hose B81, and one end of the hose B81 is connected to the pressure reducing valve 9.

[0025] The other side of the hydraulic cylinder device 7 is connected to a pressure measuring joint C32, and one side of the pressure measuring joint C32 is connected to a hose C82. The pressure measuring joint C32 and the hose C82 can be used together to form a connection. The bottom of the hose C82 is connected to an overflow valve 11, and the bottom of the overflow valve 11 is connected to a hydraulic oil tank 10.

[0026] Install an oil replenishment port on the oil inlet pipeline instead of the pressure measuring joint;

[0027] An oil drain port is installed on the oil return pipeline instead of a pressure measuring joint.

[0028] The solenoid valve 5 is a three-position four-way valve.

[0029] Specifically, when in use, the hydraulic cylinder device 7 rises to a specified height, the three-position four-way solenoid valve 5 is powered off and returns to the middle position, the hydraulic cylinder device 7 stops, and then the hydraulic control one-way valve 6 is used to lock the oil inlet and outlet chambers of the hydraulic cylinder device 7 to maintain pressure. When the piston ring 14 seal inside the hydraulic cylinder device 7 leaks, as the pressurized hydraulic oil in the rodless chamber 13 leaks into the rod chamber 15, the hydraulic oil in the rodless chamber 13 will be reduced, and the hydraulic cylinder rod 16 will drop abnormally;

[0030] At this time, the hose A8 is connected to the pressure measuring joint A3, and the system pressure is connected to the throttle valve 12 (controlling the oil replenishment speed), and then through the pressure reducing valve 9 (controlling the oil replenishment pressure), and then the oil is replenished into the rodless chamber 13 of the hydraulic cylinder device 7 through the pressure measuring joint B31;

[0031] The purpose of doing this is to replenish the oil leaking from the hydraulic cylinder device 7 through another corresponding pressure and flow rate, so that the thrust of the rodless chamber 13 (i.e., the working chamber) remains the same as the gravity of the load of the hydraulic cylinder device 7. Figure 4Load gravity = hydraulic cylinder thrust F = force area A1 of rodless chamber 13 * oil inlet pressure P1 - force area A2 of rod chamber 15 * oil return pressure P2 = A1 * P1 - A2 * P2) to keep the position of hydraulic cylinder rod 16 unchanged;

[0032] As time goes by, the hydraulic oil leaking from the rodless chamber 13 (i.e., the working chamber) of the rod chamber 15 of the hydraulic cylinder device 7 will increase, causing the pressure of the rod chamber 15 to also increase. The pressure measuring joint C32 and the hose C82 are connected to the overflow valve 11, and then the hydraulic oil is connected back to the hydraulic oil tank 10. The overflow valve 11 is set to a corresponding pressure to keep the rod chamber 15 in a low pressure or no pressure state. The purpose of doing this is simply to reduce the pressure of the rod chamber 15 to avoid reverse thrust.

[0033] When the hydraulic cylinder rod 16 needs to descend, the three-position four-way solenoid valve 5 is energized to supply oil to the rod chamber 15 and return oil to the rodless chamber 13 to achieve descent. At the same time, the flow rate of the main oil circuit DN25 is larger than the diameter of the oil discharge valve station DN6, which does not affect the descending action of the hydraulic cylinder device 7. After descending to the position, the originally set pressure of the pressure reducing valve 9 and the load of the hydraulic cylinder device 7 are still balanced, so that the position of the hydraulic cylinder device 7 remains in the new working position and does not rise abnormally.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder internal leakage automatic oil replenishment and oil circuit control device, comprising: A plunger pump (1) and a hydraulic cylinder device (7), characterized in that one end of the plunger pump (1) is connected to a stop valve (2), one side of the top of the stop valve (2) is connected to a pressure measuring joint A (3), the top of the stop valve (2) is connected to a pressure gauge (4), the top of the pressure gauge (4) is provided with a solenoid valve (5), the top of the solenoid valve (5) is connected to a hydraulically controlled one-way valve (6), and the top of the hydraulically controlled one-way valve (6) is provided with a hydraulic cylinder device (7) for controlling oil.

2. The hydraulic cylinder internal leakage automatic oil replenishment and oil circuit control device according to claim 1, characterized in that: The hydraulic cylinder device (7) comprises a rodless chamber (13), a piston ring (14) is slidably connected inside the rodless chamber (13), a hydraulic cylinder rod (16) is connected to the top of the piston ring (14), a rod chamber (15) is provided inside the hydraulic cylinder device (7) above the rodless chamber (13), a hose A (8) is connected to one side of the pressure measuring joint A (3), a throttle valve (12) is connected to one side of the hose A (8), a pressure reducing valve (9) is connected to the top of the throttle valve (12), a hydraulic oil tank (10) is connected to one side of the pressure reducing valve (9), a pressure measuring joint B (31) is connected between the hydraulic cylinder device (7) and the hydraulically controlled one-way valve (6), a hose B (81) is connected to one side of the pressure measuring joint B (31), the pressure gauge (4) is connected to one side of the hose B (81), and one end of the hose B (81) is connected to the pressure reducing valve (9).

3. The hydraulic cylinder internal leakage automatic oil replenishment and oil circuit control device according to claim 1, characterized in that: The other side of the hydraulic cylinder device (7) is connected to a pressure measuring joint C (32), one side of the pressure measuring joint C (32) is connected to a hose C (82), the bottom of the hose C (82) is connected to a relief valve (11), and the bottom of the relief valve (11) is connected to a hydraulic oil tank (10).

4. The hydraulic cylinder internal leakage automatic oil replenishment and oil circuit control device according to claim 1, characterized in that: The solenoid valve (5) is a three-position four-way valve.

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