High-pressure locking oil cylinder

Abstract

The utility model relates to the technical field of oil cylinder locking, in particular to a high-pressure locking oil cylinder. According to the technical scheme, the high-pressure locking oil cylinder comprises a piston rod, an oil cylinder front cover is arranged on the outer side of the piston rod in a sleeved mode, a one-way valve is arranged in the oil cylinder front cover, and an annular cavity is formed in one end of the one-way valve. And the hydraulic oil in the one-way valve cannot smoothly pass through and flow back into the annular cavity, so that the purpose that the front cover of the oil cylinder does not leak oil is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinder locking, in particular to a high-pressure locking oil cylinder. Background Art

[0002] With the rapid development of my country's economic construction, the application of hydraulic systems in the field of engineering machinery is increasing day by day. The hydraulic system is a set of devices that use hydraulic oil as the working medium, use the pressure energy of hydraulic oil and operate the hydraulic actuator through hydraulic control elements. In the hydraulic system, the hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion or swinging motion. When it is used to achieve reciprocating motion, there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines, and the piston rod is provided with a protective locking device to limit and fix the piston rod to ensure that personnel are not injured. The locking effect of the existing locking cylinder is not good, which affects normal use. Usually, the cylinder locking is achieved by using hydraulic control elements to close the return oil of the rodless cavity, such as various types of hydraulic locks that are widely used now. However, when the hydraulic pipeline, hydraulic lock, joint or cylinder itself leaks due to an accident, it will cause the cylinder rodless cavity to release pressure and the cylinder piston rod to be recovered. For those cylinders used in special engineering conditions, such failures are not allowed to occur, because once the cylinder is depressurized, the cylinder lifting object will loosen, which may cause major safety accidents.

[0003] At present, the most widely used die-casting machine clamping mechanism is the toggle clamping locking mechanism. There are problems with the three-platen machine with crankshaft structure. The force on the template is uneven due to the force on the upper and lower parts. The poor lubrication effect of the crankshaft joints can easily cause the pins and sleeves to wear and burn. Therefore, it has the following problems: the template is unevenly stressed, the upper and lower forces are large during the clamping process, and the forces on both sides are small, which causes the template to be unevenly stressed. The design structure of the sleeve and pin of the crankshaft part is not good, or the lubrication effect is not good, which can easily cause the sleeve and pin to burn; for super-large die-casting machines, it is easy to cause the mold adjustment to not move. The pure two-platen machine structure brings difficulties to the design structure of super-large die-casting machines. Due to the large diameter of the oil cylinder, the requirements for the seals are also high, which is easy to leak oil and the maintenance cost is too high. Specifically, there are the following problems: the center of gravity of the brake nut connected to the piston of the locking oil cylinder moves backward, and there is a tendency to tilt, which can easily cause oil leakage; because the locking oil cylinder passes through the large bar, the diameter of the oil cylinder is large.

[0004] Existing patents provide some solutions, such as patent EP2886756B1, which relates to a lock cylinder and a lock cylinder rotatable in a housing, the lock cylinder can be locked to the housing by at least one locking element operated by a key, the key can be inserted into the lock cylinder, the lock can perform a plug in a release flip situation, the housing for locking the lock plug is independently provided from the lock element and the key and an additional locking element operable by a motorized drive, wherein the additional locking element, the locking element includes, in the locked position, preventing the rotational movement of the lock cylinder relative to the housing and in the release position relative to the housing to allow the rotational movement of the lock cylinder, the additional locking element cooperates with the locking element through the local movement of the motorized drive, the spring includes, the spring of the lock element in the release position is not in its locked position and can be transferred to the locked position, the locking element acts on the locking element by a force, which turns the locking element in the locked position and the lock plug in its rotational position from the direction of the release flip situation, the lock plug of the lock element in the converted release flip situation is inserted into the locked position. However, this patent still fails to lock under long-term use.

[0005] For example, patent EP2674553A1 provides a cylinder lock, which has a main body (1), the main body has a closed channel, a specific side of the closed channel has a knob, and the other side has a key insertion hole. The knob is connected to the knob shaft via the knob side iron core part, and the closed channel is provided with a channel side iron core part. The core part is coupled to a closed beard adapter with a locking part. The knob is rotated to different positions, so that the closed beard adapter with a locking part rotates to lock or unlock the cylinder. The locking mechanism provided by this patent requires the additional provision of a separate locking component, and the processing is relatively cumbersome. The inventor believes that there is still a lot of room for improvement. Utility Model Content

[0006] The utility model aims to provide a high-pressure locking oil cylinder which can solve the problem of oil leakage caused by long-term movement of the oil cylinder, avoid oil leakage caused by oil cylinder wear and has a simple structure and low manufacturing cost.

[0007] The utility model realizes the above technical purpose by: a high-pressure locking oil cylinder, comprising a piston rod, a cylinder front cover is sleeved on the outer side of the piston rod, a one-way valve is arranged inside the cylinder front cover, and an annular cavity is arranged at one end of the one-way valve.

[0008] Furthermore, when the high-pressure locking cylinder moves, the external force drives the piston rod to move. Usually, in order to improve the movement efficiency and increase the service life of the product itself, hydraulic oil is injected into the gap between the piston rod and the cylinder sleeve. The movement efficiency of the piston rod is improved by injecting hydraulic oil, and the wear of the piston rod during movement is reduced. A one-way valve is arranged inside the front cover of the cylinder. One end of the one-way valve is aligned with the annular cavity formed by the gap between the piston rod and the cylinder sleeve. The purpose is that the movement of the piston rod will drive the hydraulic oil wrapped on its outside to move together, and bring the hydraulic oil into the one-way valve. The hydraulic oil in the one-way valve cannot pass smoothly and flow back into the annular cavity, so as to achieve the purpose of preventing the front cover of the cylinder from leaking oil.

[0009] In the utility model, a cylinder sleeve is sleeved on the outer side of the piston rod, and the cylinder sleeve is arranged at one end of the cylinder front cover.

[0010] Furthermore, the cylinder liner is arranged at the lower end of the cylinder front cover, and an annular groove for improving the tightness of the connection is provided at the connection between the cylinder liner and the cylinder front cover, so that the connection between the cylinder liner and the cylinder front cover will not loosen during frequent displacement of the piston rod.

[0011] In the utility model, the gap formed by the inner wall of the cylinder sleeve and the piston rod is an annular cavity.

[0012] In the utility model, the inner walls of the oil cylinder rear cover, the oil cylinder sleeve and the oil cylinder front cover are all provided with annular grooves for clamping.

[0013] Furthermore, under the pushing action of the piston rod, part of the hydraulic oil in the annular cavity still flows out through the gap between the piston rod and the cylinder sleeve, and the purpose of providing the annular groove and the clamping base in the annular groove is not only to improve the tightness of the connection, but also to prevent the hydraulic oil from flowing out of the gap and then flowing into the cylinder rear cover. In addition, the annular groove is provided, and the pressure in the annular cavity outside the piston rod is smaller than that in the outside world. Under the pushing action of the piston rod, the hydraulic oil can flow into the one-way valve more smoothly, avoiding the failure of the piston rod to move smoothly due to excessive pressure of the hydraulic oil.

[0014] In the utility model, a threaded hole is arranged at the end of the piston rod.

[0015] Furthermore, the threaded hole provided at the end of the piston rod can be used to connect other components.

[0016] In the utility model, the bottom of the piston rod is in contact with the oil cylinder rear cover, and the end surface of the oil cylinder rear cover is also provided with an oil cylinder sleeve.

[0017] In the utility model, a through hole is opened at the center of the oil cylinder rear cover, and a gap is provided between the oil cylinder rear cover and the piston rod.

[0018] Furthermore, a through hole is provided at the rear cover of the cylinder, and a gap is provided between the rear cover of the cylinder and the piston rod, which can ensure that the piston rod encounters less resistance when starting, thereby improving the service life of the piston rod and the overall high-pressure locking cylinder, and through the modular design of multiple components such as the cylinder front cover, cylinder liner, cylinder rear cover and piston rod, the convenience of subsequent disassembly, assembly and replacement is improved.

[0019] Furthermore, due to the long-term movement of the piston rod, the cylinder liner and the cylinder front cover will inevitably have some wear, and a one-way valve structure is arranged in the cylinder front cover, so that the hydraulic oil can smoothly flow into the one-way valve and return to the annular cavity every time. Even if the cylinder liner and the cylinder front cover are worn, it is not easy for the hydraulic oil to leak, which further improves the overall service life of the device.

[0020] In the utility model, the oil cylinder rear cover is a disc-shaped structure, and a protrusion is arranged at the end of the oil cylinder rear cover toward one end of the piston rod.

[0021] Furthermore, an annular groove is also provided on the side of the protrusion, and the annular groove is installed in cooperation with the inner wall of the cylinder liner to improve the tightness of the connection and prevent the oil driven by the piston rod during the pushing process from flowing out from the gap between the protrusion of the cylinder rear cover and the cylinder liner, thereby further improving the sealing of the locking structure, increasing the use time of a single hydraulic oil charge, and further saving costs.

[0022] In the utility model, the end surface of the protrusion abuts against the piston rod, and the side surface of the protrusion abuts against the cylinder sleeve.

[0023] Furthermore, since the piston rod can abut against the protrusions provided on the rear cover of the cylinder, the piston rod can be prevented from directly hitting the surface of the rear cover of the cylinder during movement and displacement. At the same time, a certain gap is formed by the provided protrusions, which can ensure that the piston rod encounters less resistance when starting, thereby increasing the service life of the piston rod and the overall high-pressure locking cylinder.

[0024] Furthermore, by filling the annular cavity provided between the piston rod and the side cylinder sleeve with hydraulic oil, the friction force exerted on the piston rod during movement can be further reduced, uneven force on the side of the piston rod can be avoided, and the piston rod can be prevented from being stuck and unable to move. At the same time, the one-way valve has a smaller aperture, which can further reduce the pressure of the hydraulic oil and prevent the hydraulic oil from accumulating in the one-way valve and being unable to flow back into the annular cavity smoothly. In addition, further reducing the pressure of the hydraulic oil is also conducive to reducing the pressure in the annular cavity, so that the power required for starting the piston rod is smaller, further reducing the cost required for the device during use, and playing a role in energy saving and efficiency improvement.

[0025] Compared with the prior art, the beneficial technical effect of the utility model is as follows: a one-way valve is arranged inside the front cover of the oil cylinder, and one end of the one-way valve is aligned with the annular cavity formed by the gap between the piston rod and the cylinder liner. The purpose is that the movement of the piston rod will drive the hydraulic oil coated on its outside to move together, and bring the hydraulic oil into the one-way valve. The hydraulic oil in the one-way valve cannot pass smoothly and flow back into the annular cavity, thereby achieving the purpose of preventing the front cover of the oil cylinder from leaking oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic cross-sectional structure diagram of the high-pressure locking oil cylinder involved in the utility model;

[0027] Figure 2 This is a cross-sectional structural diagram of the high-pressure locking cylinder involved in the utility model from another viewing angle;

[0028] Figure 3 The utility model involves Figure 2 The enlarged structural diagram at A in the middle;

[0029] Figure 4 The utility model involves Figure 2 Enlarged structural diagram at B in the middle.

[0030] Explanation of the accompanying drawings: 11 - front cover of the oil cylinder; 12 - cylinder liner; 13 - rear cover of the oil cylinder; 14 - piston rod; 2 - one-way valve. DETAILED DESCRIPTION

[0031] Example

[0032] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the high-pressure locking cylinder includes a piston rod 14, a cylinder front cover 11 is sleeved on the outer side of the piston rod 14, a one-way valve 2 is arranged inside the cylinder front cover 11, and an annular cavity is arranged at one end of the one-way valve 2.

[0033] Furthermore, when the high-pressure locking cylinder moves, the external force drives the piston rod 14 to move. In order to improve the movement efficiency and increase the service life of the product itself, hydraulic oil is usually injected into the gap between the piston rod 14 and the cylinder sleeve 12. The movement efficiency of the piston rod 14 is improved by injecting hydraulic oil, and the wear of the piston rod 14 during movement is reduced. A one-way valve 2 is arranged inside the cylinder front cover 11. One end of the one-way valve 2 is aligned with the annular cavity formed by the gap between the piston rod 14 and the cylinder sleeve 12. The purpose is that the movement of the piston rod 14 will drive the hydraulic oil wrapped on its outer side to move together, and bring the hydraulic oil into the one-way valve. The hydraulic oil in the one-way valve 2 cannot pass smoothly and flow back into the annular cavity, so as to achieve the purpose of preventing the cylinder front cover 11 from leaking oil.

[0034] In the utility model, a cylinder sleeve 12 is sleeved on the outer side of the piston rod 14 , and the cylinder sleeve 12 is arranged at one end of the cylinder front cover 11 .

[0035] Furthermore, the cylinder liner 12 is arranged at the lower end of the cylinder front cover 11, and an annular groove for improving the tightness of the connection is provided at the connection between the cylinder liner 12 and the cylinder front cover 11, so that the connection between the cylinder liner 12 and the cylinder front cover 11 will not loosen during frequent displacement of the piston rod 14.

[0036] In the present invention, the gap formed by the inner wall of the cylinder sleeve 12 and the piston rod 14 is an annular cavity.

[0037] In the utility model, the inner walls of the oil cylinder rear cover 13, the oil cylinder sleeve 12 and the oil cylinder front cover 11 are all provided with annular grooves for clamping.

[0038] Furthermore, under the pushing action of the piston rod 14, part of the hydraulic oil in the annular cavity still flows out through the gap between the piston rod 14 and the cylinder sleeve 12, and the purpose of providing the annular groove and the clamping base in the annular groove is not only to improve the tightness of the connection, but also to prevent the hydraulic oil from flowing out of the gap and then flowing into the cylinder rear cover 13. In addition, due to the provision of the annular groove, the pressure in the annular cavity outside the piston rod 14 is smaller than that in the outside, and under the pushing action of the piston rod 14, the hydraulic oil can flow into the one-way valve 2 more smoothly, preventing the piston rod 14 from being unable to move smoothly due to excessive pressure of the hydraulic oil.

[0039] In the present invention, a threaded hole is provided at the end of the piston rod 14 .

[0040] Furthermore, the threaded hole provided at the end of the piston rod 14 can be used to connect other components.

[0041] In the present invention, the bottom of the piston rod 14 abuts against the oil cylinder rear cover 13 , and the end surface of the oil cylinder rear cover 13 is further provided with an oil cylinder sleeve 12 .

[0042] In the utility model, a through hole is opened at the center of the oil cylinder rear cover 13 , and a gap is provided between the oil cylinder rear cover 13 and the piston rod 14 .

[0043] Furthermore, a through hole is opened at the cylinder rear cover 13, and a gap is set between the cylinder rear cover 13 and the piston rod 14, which can ensure that the piston rod 14 encounters less resistance when starting, thereby improving the service life of the piston rod 14 and the overall high-pressure locking cylinder, and through the modular design of multiple components such as the cylinder front cover 11, the cylinder liner 12, the cylinder rear cover 13 and the piston rod 14, the convenience of subsequent disassembly, assembly and replacement is improved.

[0044] Furthermore, due to the long-term movement of the piston rod 14, the cylinder liner 12 and the cylinder front cover 11 will inevitably have some wear, and the structure of the one-way valve 2 is arranged in the cylinder front cover 11, so that the hydraulic oil can smoothly flow into the one-way valve 2 and return to the annular cavity every time. Even if the cylinder liner 12 and the cylinder front cover 11 are worn, it is not easy for the hydraulic oil to leak, which further improves the overall service life of the device.

[0045] Example

[0046] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, in the present invention, the oil cylinder rear cover 13 is a disc-shaped structure, and a protrusion is provided at the end of the oil cylinder rear cover 13 facing one end of the piston rod 14 .

[0047] Furthermore, an annular groove is also provided on the side of the protrusion, and the annular groove is installed in cooperation with the inner wall of the cylinder liner 12, so as to improve the tightness of the connection, and also prevent the oil driven by the piston rod 14 during the pushing process from flowing out from the gap between the protrusion of the cylinder rear cover 13 and the cylinder liner 12, thereby further improving the sealing performance of the locking structure, increasing the use time of a single hydraulic oil charge, and further saving costs.

[0048] In the present invention, the end surface of the protrusion abuts against the piston rod 14 , and the side surface of the protrusion abuts against the cylinder sleeve 12 .

[0049] Furthermore, since the piston rod 14 can abut against the protrusions provided on the cylinder rear cover 13, the piston rod 14 is prevented from directly hitting the surface of the cylinder rear cover 13 during movement and displacement. At the same time, a certain gap is formed by the provided protrusions, which can ensure that the piston rod 14 encounters less resistance when starting, thereby improving the service life of the piston rod 14 and the overall high-pressure locking cylinder.

[0050] Furthermore, the locking cylinder can be used in a double-sided vertical die-casting mechanism, which can further improve the injection efficiency, while avoiding various defects in the product and improving the quality of the product.

[0051] Furthermore, by filling the annular cavity provided between the piston rod 14 and the side cylinder sleeve 12 with hydraulic oil, the friction force on the piston rod 14 during movement can be further reduced, thereby avoiding uneven force on the side of the piston rod 14 and preventing the piston rod 14 from being stuck and unable to move. At the same time, the one-way valve 2 has a smaller aperture, which can further reduce the pressure of the hydraulic oil and avoid the accumulation of hydraulic oil in the one-way valve 2 and its inability to flow back to the annular cavity smoothly. In addition, further reducing the pressure of the hydraulic oil is also conducive to reducing the pressure in the annular cavity, so that the power required for starting the piston rod 14 is smaller, further reducing the cost required for the device during use, and playing a role in energy saving and efficiency improvement.

[0052] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. High-pressure locking cylinder, characterized in that: It comprises a piston rod (14), the piston rod (14) is sleeved with a cylinder front cover (11) on the outside, a one-way valve (2) is arranged inside the cylinder front cover (11), and an annular cavity is arranged at one end of the one-way valve (2); The piston rod (14) is sleeved on its outer side with a cylinder sleeve (12), and the cylinder sleeve (12) is arranged on one side of the cylinder front cover (11); The gap formed by the assembly of the inner wall of the oil cylinder sleeve (12) and the piston rod (14) is an annular cavity.

2. The high-pressure locking cylinder according to claim 1, characterized in that: A threaded hole is provided at the end of the piston rod (14).

3. The high-pressure locking cylinder according to claim 1, characterized in that: The bottom of the piston rod (14) is in contact with a cylinder rear cover (13), and the end surface of the cylinder rear cover (13) is also provided with a cylinder sleeve (12).

4. The high-pressure locking cylinder according to claim 3, characterized in that: The inner walls of the oil cylinder rear cover (13), the oil cylinder sleeve (12) and the oil cylinder front cover (11) are all provided with annular grooves for clamping.

5. The high-pressure locking cylinder according to claim 3, characterized in that: A through hole is provided at the center of the oil cylinder rear cover (13), and a gap is provided between the oil cylinder rear cover (13) and the piston rod (14).

6. The high-pressure locking cylinder according to claim 5, characterized in that: The oil cylinder rear cover (13) is a disc-shaped structure, and a protrusion is provided at an end of the oil cylinder rear cover (13) facing one end of the piston rod (14).

7. The high-pressure locking cylinder according to claim 6, characterized in that: The end surface of the protrusion abuts against the piston rod (14), and the side surface of the protrusion abuts against the cylinder sleeve (12).

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