Oil cylinder

Abstract

The utility model discloses an oil cylinder, belongs to the technical field of oil cylinder maintenance, and aims to solve the problem that when a liquid storage oil cylinder is transported or stored in the prior art, internal oil pressure rises to damage the oil cylinder. When the oil cylinder is used, the working oil port of the oil cylinder is closed, the oil cylinder enters a liquid storage transportation / storage state, and the oil pressure in the oil cylinder rises along with rising of the temperature; the first oil duct is communicated with the rodless cavity or the rod cavity, the pressure limiting protection valve is communicated with the pressure in the oil cylinder, and the pressure limiting protection valve is used for limiting the pressure in the oil cylinder and preventing the oil cylinder from being damaged due to too high pressure; if the pressure limiting protection valve breaks down, the hydraulic oil tends to leak quickly, and at the moment, the flow limiting valve discharges the hydraulic oil within the limited flow; when the pressure limiting protection valve further breaks down or the flow limiting valve also breaks down, the first oil duct is closed through the emergency valve to prevent further aggravation of the fault and further leakage of the hydraulic oil; therefore, the probability or degree of structural damage caused by internal oil pressure rise is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oil cylinder belongs to oil cylinder maintenance technical field. BACKGROUND

[0002] A large number of hydraulic cylinders are used on cranes, and the hydraulic cylinders are also disassembled, transported or stored when the crane is disassembled for transportation or storage. At the same time, in order to facilitate and be quick, the oil port is blocked after the oil cylinder is disassembled, and the hydraulic oil is retained in the oil cylinder. When the temperature rises, such as long-time sun exposure, environmental temperature change, etc., the hydraulic oil in the oil cylinder will expand due to the temperature rise, and the internal pressure of the oil cylinder will rise due to the closure of the oil cylinder, which will damage the weakest part in the oil cylinder when the pressure is too high. The hydraulic oil will leak out of the guide sleeve, and even the guide sleeve will be pushed out, causing damage to the oil cylinder.

[0003] Therefore, when the existing oil cylinder is transported or stored as a liquid storage oil cylinder, the internal oil pressure will rise and damage the oil cylinder. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide an oil cylinder that avoids damage caused by rising oil pressure when the oil cylinder is used as a liquid storage oil cylinder.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] The present application provides an oil cylinder, comprising,

[0007] Rodless cavity, rod cavity and first oil hole, the first oil hole is arranged in the cylinder wall of the rodless cavity and / or the rod cavity;

[0008] The oil cylinder protection device comprises a flow limiting valve, an emergency valve, a pressure limiting protection valve and a first oil channel; the first oil channel is in communication with the rodless cavity or the rod cavity through the first oil hole, and the first oil channel is also in communication with the inlet of the pressure limiting protection valve and the inlet of the flow limiting valve; an emergency valve for closing the first oil channel is arranged on the first oil channel.

[0009] In some embodiments of the present application, the oil cylinder protection device further comprises a mounting shell, the flow limiting valve, the emergency valve, the pressure limiting protection valve and the first oil channel are fixed in the mounting shell, the mounting shell is detachably mounted on the cylinder wall, and the first oil channel is detachably communicated with the first oil hole;

[0010] Further comprising a first sealing plug matched with the first oil hole.

[0011] In some embodiments of the present application, the flow limiting valve and the pressure limiting protection valve are arranged in series on the first oil passage, the inlet of the flow limiting valve is communicated with the first oil hole, the outlet of the flow limiting valve is communicated with the inlet of the pressure limiting protection valve, and the outlet of the pressure limiting protection valve is communicated with an oil storage device.

[0012] In some embodiments of the present application, the emergency valve is connected in series between the outlet of the flow limiting valve and the inlet of the pressure limiting protection valve.

[0013] In some embodiments of the present application, the flow limiting valve is a damping hole, a throttle valve or a speed regulating valve.

[0014] In some embodiments of the present application, the emergency valve is a hand-operated emergency valve or an electric signal control emergency valve.

[0015] In some embodiments of the present application, the hand-operated emergency valve is a hand-operated ball valve or a hand-operated reversing valve.

[0016] In some embodiments of the present application, the pressure limiting protection valve is an overflow valve or a check valve.

[0017] In some embodiments of the present application, a second oil passage is further included; a second oil hole is formed in the cylinder wall of the rodless chamber, a third oil hole is formed in the cylinder wall of the rod chamber, the second oil passage is communicated with the rodless chamber through the second oil hole, and the second oil passage is communicated with the rod chamber through the third oil hole.

[0018] In some embodiments of the present application, the second oil hole is provided with a first quick release connector, the third oil hole is provided with a second quick release connector, and the two ends of the second oil passage are respectively provided with a third quick release connector and a fourth quick release connector; the first quick release connector is connected with the third quick release connector, and the second quick release connector is connected with the fourth quick release connector, so that the second oil passage is detachably communicated with the rodless chamber and the rod chamber.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The oil cylinder provided by the application is used, the working oil port of the oil cylinder is closed, and the oil cylinder enters a liquid storage and transportation / storage state, with the increase of temperature, the oil pressure in the oil cylinder is increased; as the first oil channel is communicated with the rodless cavity or the rod cavity, the pressure limiting protection valve is communicated with the pressure in the oil cylinder, the pressure limiting protection valve is used for limiting the pressure in the oil cylinder, and damage of the oil cylinder caused by excessively high pressure is prevented; if the pressure limiting protection valve fails (such as being stuck), the hydraulic oil has a tendency of rapid leakage, at this time, the flow limiting valve discharges the hydraulic oil within the limited flow, reduces the leakage amount of the hydraulic oil of the pressure limiting protection valve, prevents the leakage amount from increasing, and prevents the pressure limiting protection valve from further failing; when the pressure limiting protection valve further fails or the flow limiting valve also fails, the first oil channel is closed through the emergency valve to prevent the failure from further aggravating and the hydraulic oil from further leaking; thereby, the probability or degree of structural damage caused by the increase of the internal oil pressure when the oil cylinder is transported or stored as an internally closed liquid storage oil cylinder is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0022] Figure 1 is a structural schematic diagram of the oil cylinder provided by the embodiment;

[0023] Figure 2 is Figure 1 a structural schematic diagram of the oil cylinder protection device in the embodiment;

[0024] In the figure: 1, cylinder bottom; 2, rodless cavity; 3, piston; 4, rod cavity; 5, oil cylinder protection device; 6, guide sleeve; 7, piston rod; 8, rodless cavity oil port; 9, second oil channel; 10, rod cavity oil port; 11, first quick release joint; 12, second quick release joint; 13, third quick release joint; 14, fourth quick release joint; 5.1, flow limiting valve; 5.2, emergency valve; 5.3, pressure limiting protection valve; 5.4, first oil channel. DETAILED DESCRIPTION

[0025] The technical solutions in the application / embodiments of the application will be described clearly and completely below in combination with the drawings in the application / embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the application / embodiments of the application and its application or use. Embodiment one

[0026] The oil cylinder is used to solve the problem of structural damage caused by the increase of internal oil pressure when the oil cylinder is transported or stored as an internally closed liquid storage cylinder.

[0027] Reference Figure 1 With Figure 2 The oil cylinder provided by the embodiment includes a rodless cavity 2, a rod cavity 4, and a first oil hole which is opened in the cylinder wall of the rodless cavity 2 or the rod cavity 4 as needed;

[0028] The oil cylinder protection device 5 includes a flow limiting valve 5.1, an emergency valve 5.2, a pressure limiting protection valve 5.3, and a first oil channel 5.4. The first oil channel 5.4 is in communication with the rodless cavity 2 or the rod cavity 4 through the first oil hole, and is also in communication with the inlet of the pressure limiting protection valve 5.3 and the inlet of the flow limiting valve 5.1. The emergency valve 5.2 for closing the first oil channel 5.4 is arranged on the first oil channel 5.4.

[0029] In use, the working oil port of the oil cylinder is closed, and the oil cylinder enters a liquid storage and transportation / storage state. As the temperature rises, the oil pressure in the oil cylinder increases. Since the first oil channel 5.4 is in communication with the rodless cavity 2 or the rod cavity 4, and the pressure limiting protection valve 5.3 is in communication with the pressure in the oil cylinder, the pressure limiting protection valve 5.3 is used to limit the internal pressure of the oil cylinder to prevent the oil cylinder from being damaged due to excessive pressure. If the pressure limiting protection valve 5.3 fails (such as being stuck), there will be a tendency for the hydraulic oil to leak quickly. At this time, the flow limiting valve 5.1 discharges the hydraulic oil within the limited flow, thereby reducing the leakage of the hydraulic oil of the pressure limiting protection valve 5.3, preventing the leakage from increasing, and preventing the pressure limiting protection valve 5.3 from further failing. When the pressure limiting protection valve 5.3 further fails or the flow limiting valve 5.1 also fails, the emergency valve 5.2 is used to close the first oil channel 5.4 to prevent the failure from further intensifying and the hydraulic oil from further leaking; thereby reducing the probability or degree of structural damage caused by the increase of internal oil pressure when the oil cylinder is transported or stored as an internally closed liquid storage cylinder. Embodiment Two

[0030] The oil cylinder provided by the embodiment is optimized on the basis of the oil cylinder provided by the first embodiment to improve the technical effect and refine the technical solution. The contents not described in detail in the embodiment can be found in the first embodiment.

[0031] As one of the embodiments, in order to improve the cooperative working efficiency of the flow limiting valve 5.1 and the pressure limiting protection valve 5.3, reference is made to Figure 2, the flow limiting valve 5.1 and the pressure limiting protection valve 5.3 are arranged in series on the first oil passage 5.4, the inlet of the flow limiting valve 5.1 is communicated with the first oil hole, the outlet of the flow limiting valve 5.1 is communicated with the inlet of the pressure limiting protection valve 5.3, and the outlet of the pressure limiting protection valve 5.3 is communicated with the oil storage device or directly exposed to the outside. When the pressure limiting protection valve 5.3 fails and leakage occurs, the flow limiting valve 5.1 can throttle the hydraulic oil upstream of the pressure limiting protection valve 5.3 to prevent the leakage from worsening.

[0032] The leakage generally occurs in the pressure limiting protection valve 5.3. As one of the embodiments, referring to Figure 2 , the emergency valve 5.2 is arranged in series between the outlet of the flow limiting valve 5.1 and the inlet of the pressure limiting protection valve 5.3. When the pressure limiting protection valve 5.3 leaks, the emergency valve 5.2 can cut off the hydraulic source of the pressure limiting protection valve 5.3 to prevent the leakage from worsening. At the same time, arranging the emergency valve 5.2 between the outlet of the flow limiting valve 5.1 and the inlet of the pressure limiting protection valve 5.3 is also conducive to the stability of the structure and the transmission of pressure.

[0033] As one of the embodiments, the flow limiting valve 5.1 is a damping orifice, a throttle valve or a proportional valve. The damping orifice, also known as hydraulic resistance, is a hydraulic valve port or similar structure that can locally change the flow area of the liquid flow, causing pressure loss of the liquid flow. When the fluid flows through the damping orifice, the pressure increases due to the flow restriction, which helps to restore the pressure lost by the fluid passing through the pump or other components. The damping orifice also helps to maintain a high pressure level, minimizing pressure drop, thereby preventing the fluid from reaching the vapor pressure and forming cavitation bubbles. The structure of the throttle valve is relatively simple, which makes it have high reliability and long service life, and the maintenance cost is relatively low. The throttle valve generally has high pressure capacity, is suitable for high pressure systems, and can ensure the safe and stable operation of the system. The proportional valve has a more complex structure and working principle than the ordinary throttle valve, but it can achieve more accurate and flexible flow control, especially suitable for hydraulic systems with high speed control accuracy requirements. The proportional valve can achieve smooth speed regulation of the hydraulic system, avoiding shocks and vibrations caused by rapid changes in system speed, thereby improving the stability and efficiency of the system.

[0034] As one of the embodiments, the emergency valve 5.2 is a hand control emergency valve or an electric signal control emergency valve. The hand control emergency valve can be handled in time after the personnel discovers the hydraulic oil leakage, and the signal end of the electric signal control emergency valve can be coupled with the control system of the vehicle or the warehouse.

[0035] As one of the embodiments, the hand control emergency valve is a hand control ball valve or a hand control reversing valve. The hand control ball valve has flexible diameter design, which can meet the demand of large flow. The internal flow passage of the valve is designed reasonably, with small resistance, reducing the pressure loss of the pipeline. The hand control reversing valve can realize the steering control of the valve through the handle or hand wheel, and the operation is very simple.

[0036] As one of the embodiments, referring to Figure 1 , the oil cylinder further comprises a second oil channel 9; the cylinder wall of the rodless cavity 2 is provided with a second oil hole 8, the cylinder wall of the rod cavity 4 is provided with a third oil hole 10, the second oil channel 9 communicates with the rodless cavity 2 through the second oil hole 8, and the second oil channel 9 communicates with the rod cavity 4 through the third oil hole 10.

[0037] The unit length oil storage capacity of the rodless cavity 2 is greater than that of the rod cavity 4, when the oil pressure rises, the hydraulic oil expanded in the rod cavity 4 flows into the rodless cavity 2 through the second oil channel 9, and the piston 3 and the piston rod 7 move out in the direction shown in Figure 1 , the extra volume of the rodless cavity 2 per unit length compared with the rod cavity 4 can well alleviate the rise of the hydraulic oil pressure. The second oil channel 9 can be used together with the first oil channel 5.4, reducing the damage of the rise of the hydraulic oil to the oil cylinder structure represented by the cylinder bottom 1, the guide sleeve 6 and the working oil port.

[0038] As one of the embodiments, referring to Figure 1 , the second oil hole 8 is provided with a first quick release connector 11, the third oil hole 10 is provided with a second quick release connector 12, and the two ends of the second oil channel 9 are respectively provided with a third quick release connector 13 and a fourth quick release connector 14; the first quick release connector 11 is connected with the third quick release connector 13, and the second quick release connector 12 is connected with the fourth quick release connector 14, so as to realize the detachable communication of the second oil channel 9 with the rodless cavity 2 and the rod cavity 4.

[0039] When the oil cylinder is ready to be used, the second oil channel 9 is removed through the quick release connector, and the second oil hole 8 and the third oil hole 10 are blocked, so as to ensure the normal use of the oil cylinder.

[0040] As one of the embodiments, the oil cylinder protection device 5 further comprises a mounting shell, the flow limiting valve 5.1, the emergency valve 5.2, the pressure limiting protection valve 5.3 and the first oil channel 5.4 are fixed in the mounting shell, the mounting shell is detachably mounted on the cylinder wall, and the first oil channel 5.4 is detachably communicated with the first oil hole; and the first blocking matched with the first oil hole. When the oil cylinder is ready to be stored or transported, the oil cylinder protection device 5 is mounted on the cylinder wall; when the oil cylinder is ready to be used, the mounting shell and the first oil channel 5.4 are removed, and the first blocking is used to block the first oil hole to ensure the normal use of the oil cylinder.

[0041] In summary, the oil cylinder provided by the embodiment improves the protection of the internal structure when the hydraulic oil pressure rises, and prevents damage caused by excessive internal pressure of the oil cylinder.

[0042] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0043] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "set in", "provided with", "located", "mounted", "set", and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. "Hinged" includes "rotary connection".

[0044] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the art, without departing from the technical principles of the utility model, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the utility model.

Claims

1. A cylinder, characterized in that It comprises, a rodless cavity (2), a rod cavity (4) and a first oil hole, the first oil hole is opened in the cylinder wall of the rodless cavity (2) and / or the rod cavity (4); An oil cylinder protection device (5) comprising a flow limiting valve (5.1), an emergency valve (5.2), a pressure limiting protection valve (5.3) and a first oil way (5.4); the first oil way (5.4) is communicated with the rodless cavity (2) or the rod cavity (4) through the first oil hole, the first oil way (5.4) is also communicated with the inlet of the pressure limiting protection valve (5.3) and the inlet of the flow limiting valve (5.1), and the emergency valve (5.2) for closing the first oil way (5.4) is arranged on the first oil way (5.4).

2. The cylinder according to claim 1, characterized in that It comprises, the oil cylinder protection device (5) further comprises a mounting shell, the flow limiting valve (5.1), the emergency valve (5.2), the pressure limiting protection valve (5.3) and the first oil way (5.4) are fixed in the mounting shell, the mounting shell is detachably mounted on the cylinder wall, and the first oil way (5.4) is detachably communicated with the first oil hole; It further comprises a first plugging matched with the first oil hole.

3. The cylinder as defined in claim 1, characterized in that The flow limiting valve (5.1) and the pressure limiting protection valve (5.3) are arranged in series on the first oil way (5.4), the inlet of the flow limiting valve (5.1) is communicated with the first oil hole, the outlet of the flow limiting valve (5.1) is communicated with the inlet of the pressure limiting protection valve (5.3), and the outlet of the pressure limiting protection valve (5.3) is communicated with an oil storage device.

4. The cylinder according to claim 3, wherein The emergency valve (5.2) is connected in series between the outlet of the flow limiting valve (5.1) and the inlet of the pressure limiting protection valve (5.3).

5. The cylinder of claim 1 wherein, The flow limiting valve (5.1) is a damping hole, a throttle valve or a speed regulating valve.

6. The cylinder of claim 1 wherein, The emergency valve (5.2) is a hand control emergency valve or an electric signal control emergency valve.

7. The cylinder according to claim 6, characterized in that The hand control emergency valve is a hand control ball valve or a hand control reversing valve.

8. The cylinder of claim 1 wherein, The pressure limiting protection valve (5.3) is an overflow valve or a one-way valve.

9. The oil cylinder according to any one of claims 1 to 8, characterized in that It further comprises a second oil way (9); the cylinder wall of the rodless cavity (2) is provided with a second oil hole (8), the cylinder wall of the rod cavity (4) is provided with a third oil hole (10), the second oil way (9) is communicated with the rodless cavity (2) through the second oil hole (8), and the second oil way (9) is communicated with the rod cavity (4) through the third oil hole (10).

10. The cylinder according to claim 9, wherein The second oil hole (8) is provided with a first quick release connector (11), the third oil hole (10) is provided with a second quick release connector (12), and the two ends of the second oil way (9) are respectively provided with a third quick release connector (13) and a fourth quick release connector (14); the first quick release connector (11) is connected with the third quick release connector (13), the second quick release connector (12) is connected with the fourth quick release connector (14), so that the second oil way (9) is detachably communicated with the rodless cavity (2) and the rod cavity (4).

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