A swing hydraulic cylinder with damping function

Abstract

The present invention relates to the field of hydraulic machinery, and provides a swing hydraulic cylinder with a damping function. The hydraulic oil entering the hydraulic oil inlet pushes the piston sleeve to reciprocate in a straight line. The piston sleeve is meshed with the rear pressure cover through a spiral gear, and the rear pressure cover is fixed. The piston sleeve will also rotate along the spiral direction during the movement. The piston sleeve is meshed with the outer spiral gear of the output shaft through the inner spiral gear, so that the output shaft produces reciprocating rotational motion; the hydraulic oil inlet and the hydraulic oil outlet are each provided with two channels, and the two channels are a certain distance apart, and a damping structure is added to one of the channels; the oil chamber of the piston sleeve is a conical surface, and during the piston sleeve running to the end point, its conical surface structure gradually blocks the first channel of the hydraulic oil outlet, and only the channel with a damping structure at the rear has hydraulic oil flowing out. The present invention can better meet the requirements for opening and closing of the tongue valve, improve the working reliability of the tongue valve, reduce the instantaneous noise of valve opening and closing, and reliably output the valve closing signal.

Description

Technical Field

[0001] The invention relates to the field of hydraulic machinery, in particular to a swing hydraulic cylinder with a damping function. Background Art

[0002] Hydraulic cylinders have the characteristics of fast opening and closing speeds and large opening and closing torques, and are widely used in fields such as valve opening and closing control and driving of other mechanical components.

[0003] The opening and closing of a high-pressure tongue valve on a ship needs to be completed by a hydraulic cylinder, which requires a closing signal output after the valve is closed. At the same time, the valve must not hit the valve body when opening and closing, reduce noise, and improve valve working reliability. Currently, the commonly used hydraulic cylinders have problems such as large size and high-speed impact of the valve on the valve body when opening and closing to the end position, resulting in high noise. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a swing hydraulic cylinder with a damping function, which can better meet the requirements of opening and closing of the tongue valve, improve the working reliability of the tongue valve, reduce the instantaneous noise of valve opening and closing, and reliably output the valve closing signal.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a swing hydraulic cylinder with damping function, including a piston sleeve, a hydraulic cylinder body, an output shaft, a gasket, a front pressure cover, a rear pressure cover, a hydraulic oil inlet, a hydraulic oil outlet, a damping structure and a junction box.

[0006] The hydraulic oil entering the hydraulic oil inlet pushes the piston sleeve to reciprocate in a straight line. The piston sleeve is meshed with the rear gland through a helical gear, and the rear gland is fixed. The piston sleeve will also rotate in the helical direction during the movement. The piston sleeve is meshed with the outer helical gear of the output shaft through the inner helical gear, so that the output shaft produces reciprocating rotational motion. The square terminal extending out of the output shaft is used to connect with external valves and other components, and can drive external valves and other components to rotate.

[0007] Two channels are respectively provided for the hydraulic oil inlet and the hydraulic oil outlet, and the two channels are a certain distance apart, and a damping structure is added to one of the channels; the oil chamber of the piston sleeve is a conical surface, and during the movement of the piston sleeve toward the end point, its conical surface structure gradually blocks the first channel of the hydraulic oil outlet, and only the channel with a damping structure at the rear has hydraulic oil flowing out; at this time, the flow rate of the hydraulic cylinder is greatly reduced, and its running speed is slowed down accordingly, which can greatly reduce the impact force that may occur to the external working parts when the hydraulic cylinder is in the extreme position.

[0008] A limit switch is provided in the junction box, and a screw is provided on the output shaft at a position corresponding to the limit switch. During the rotation of the output shaft, the screw rotates with the shaft. When the output shaft runs to the limit position, the screw just presses the limit switch in the junction box and outputs a rotation to position signal.

[0009] In the above technical solution, the damping structure is in the form of a screw, which is directly connected and fixed to the hydraulic oil inlet and outlet channels through threads. A through hole is left inside the screw to ensure that a small flow of hydraulic fluid can pass through, thereby increasing the flow resistance by reducing the flow area.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. It adopts helical gear meshing output and the cylinder volume is small;

[0012] 2. The piston sleeve adopts a conical surface structure, and the hydraulic port is equipped with dual channels and a damping structure, which can effectively ensure that the output speed of the hydraulic cylinder is rapidly reduced when the piston moves to the limit position, and effectively avoid the high-speed impact caused by the valve and other components in place;

[0013] 3. Add screws to the output shaft and use the screws to tighten the limit switch to ensure reliable output of the output shaft rotation signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a swing hydraulic cylinder with damping function.

[0015] Figure 2 It is a side view of a swing hydraulic cylinder with damping function.

[0016] In the figure: 1-front pressure cover, 2-gasket, 3-hydraulic cylinder body, 4-piston sleeve, 5-output shaft, 6-rear pressure cover, 7-junction box, 8-screw, 9-limit switch, 10-hydraulic oil inlet and outlet, 11-damping structure.

[0017] Figure 3 This is the appearance diagram of the swing hydraulic cylinder with damping function. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiment is only one of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figures 1 to 3 As shown, a swing hydraulic cylinder with damping function includes a piston sleeve 4, a hydraulic cylinder body 3, an output shaft 5, a gasket 2, a front gland 1, a rear gland 6, a hydraulic oil inlet, a hydraulic oil outlet, a damping structure 11 and a junction box 7.

[0020] The hydraulic cylinder is provided with a hydraulic oil inlet and a hydraulic oil outlet in mutually perpendicular directions of 90 degrees. The hydraulic oil entering the hydraulic oil inlet pushes the piston sleeve 4 to reciprocate linearly. The piston sleeve 4 is meshed with the rear gland 6 through a helical gear, and the rear gland 6 is fixed. The piston sleeve 4 will also rotate along the helical direction during the movement. The piston sleeve 4 is meshed with the outer helical gear of the output shaft 5 through the inner helical gear, so that the output shaft 5 generates reciprocating rotational motion. The square terminal extending out of the output shaft 5 is used to connect with external valves and other components, and can drive external valves and other components to rotate.

[0021] Two channels are provided at the hydraulic oil inlet and the hydraulic oil outlet respectively, and the two channels are a certain distance apart, and a damping structure 11 is added to one of the channels; the oil chamber of the piston sleeve 4 is a conical surface, and during the movement of the piston sleeve 4 to the end point, its conical surface structure gradually blocks the first channel of the hydraulic oil outlet, and only the channel with the damping structure 11 at the rear has hydraulic oil flowing out; at this time, the flow rate of the hydraulic cylinder is greatly reduced, and its running speed is slowed down accordingly, which can greatly reduce the impact force that may occur to the external working parts when the hydraulic cylinder is in the extreme position.

[0022] A limit switch 9 is provided in the junction box 7, and a screw 8 is provided on the output shaft 5 at a position corresponding to the limit switch 9. During the rotation of the output shaft 5, the screw 8 rotates with the shaft. When the output shaft 5 runs to the limit position, the screw 8 just presses the limit switch 9 in the junction box and outputs a rotation to position signal.

[0023] The damping structure is similar to an ordinary screw, and is directly connected and fixed to the second channel of the hydraulic oil inlet and outlet through a thread. A through hole is left inside the screw to ensure that a small flow of hydraulic fluid can pass through.

[0024] Figure 1 The piston sleeve 4 of the middle hydraulic cylinder is located on the far left. At this time, the hydraulic oil inlet is perpendicular to the paper surface, and the hydraulic oil outlet is above. At this time, the hydraulic cylinder works as follows:

[0025] (1) The piston sleeve 4 is meshed with the rear gland 6 through the helical gears. Since the rear gland 6 is fixed, when the hydraulic oil enters the hydraulic cylinder from the inlet, it will push the piston sleeve 4 to move in a right spiral direction.

[0026] (2) When the piston sleeve 4 rotates to the right, the internal helical gear meshes with the external helical gear of the output shaft 5, and the output shaft 5 is fixed in the axial direction and cannot move. The meshing effect will cause the output shaft 5 to rotate;

[0027] (3) When the piston sleeve 4 approaches the right end position, the first channel of the oil outlet is gradually blocked. When the piston sleeve 4 runs for the last distance, only the channel with the damping structure 11 at the rear has hydraulic oil flowing out. At this time, the flow rate of the hydraulic cylinder is greatly reduced, and its running speed is slowed down accordingly, which can ensure that the speed of the flap valve is reduced when it is close to opening or closing.

[0028] (4) When the piston sleeve 4 moves to the right end position, the output shaft 5 also rotates to the limit angle. At this time, the screw 8 fixed on the output shaft 5 at the junction box is rotated to the position of the limit switch 9, and the switch above is pressed, so that the switch outputs the hydraulic cylinder rotation signal;

[0029] (5) When the oil inlet and outlet directions are changed, the output shaft 5 rotates in the opposite direction. When approaching the limit position, the resistance structure can ensure that the rotation speed is greatly reduced.

[0030] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A swing hydraulic cylinder with damping function, comprising a piston sleeve, a hydraulic cylinder body, an output shaft, a gasket, a front gland, a rear gland, a hydraulic oil inlet, a hydraulic oil outlet, a damping structure and a junction box, characterized in that: The hydraulic oil entering the hydraulic oil inlet pushes the piston sleeve to move back and forth in a straight line. The piston sleeve is meshed with the rear pressure cover through a helical gear, and the rear pressure cover is fixed. The piston sleeve will also rotate in the helical direction during the movement. The piston sleeve is meshed with the outer helical gear of the output shaft through the internal helical gear, so that the output shaft produces a reciprocating rotational motion; the hydraulic oil inlet and the hydraulic oil outlet are each provided with two channels, and the two channels are a certain distance apart, and a damping structure is added to one of the channels; the oil chamber of the piston sleeve is a conical surface, and its conical surface structure gradually decreases during the movement of the piston sleeve to the end point. The first channel of the hydraulic oil outlet is gradually blocked, and hydraulic oil only flows out of the channel with a damping structure at the rear. The damping structure is in the form of a screw, which is directly connected and fixed to the channels of the hydraulic oil inlet and the hydraulic oil outlet through a thread. A through hole is left inside the screw to ensure the passage of a smaller flow of hydraulic fluid. A limit switch is provided in the junction box, and a screw is provided on the output shaft at a position corresponding to the limit switch. During the rotation of the output shaft, the screw rotates with the shaft. When the output shaft runs to the limit position, the screw just presses the limit switch in the junction box, and the output rotation is in place signal.

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