CN211550704U

CN211550704U - Angular travel hydraulic actuator

Info

Publication number: CN211550704U
Application number: CN201922479603.5U
Authority: CN
Inventors: 徐晶; 张莹; 肖利
Original assignee: Wuxi Chengtiannuo Actuator Manufacturing Co ltd
Current assignee: Wuxi Chengtiannuo Actuator Manufacturing Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-22
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses an angular travel hydraulic actuator, wherein a shifting fork shaft hinged with a shell is arranged in the shell, hydraulic cylinders are symmetrically arranged at two ends of the shell, a slider is arranged at the end part of a hydraulic rod of the hydraulic cylinder, the slider is sleeved on a fixed rod in the shell, the slider is matched with a shifting fork on the shifting fork shaft to control the shifting fork shaft to rotate, a bidirectional hydraulic buffer is fixed on the slider, and the length of a collided head extending out of the slider is about 20 mm; buffer springs are respectively sleeved at two ends of the fixed rod and fixed on the end face of the shell through annular spring seats, and the wire diameters of the buffer springs are changed from thin to thick. The utility model discloses a set up two-way hydraulic buffer on the slider, establish buffer spring through overlapping at dead lever both ends to reduced the impact, realized the buffer protection to pneumatic actuator and its driven valve, make pneumatic actuator satisfy the requirement of quick-opening or quick-closing promptly, be unlikely to again to damage the spacing guiding mechanism in the casing, furthest's improvement the reliability and the life of product.

Description

Angular travel hydraulic actuator

Technical Field

The utility model relates to an actuating mechanism field especially relates to an angle stroke hydraulic actuator.

Background

The angular travel actuator is a device for controlling the opening and closing of a valve at 0 to 90 degrees, and is mainly used for controlling ball valves, plug valves, butterfly valves and louver valves. The actuator receives the control signal from the regulator, and the actuator converts the control signal into corresponding angular displacement to operate the valve, so as to realize the change and regulation of the valve flow. In the industrial automatic control process, the valve is required to be capable of responding quickly and closing or opening quickly, so that the aim of quickly and effectively controlling a medium controlled by the valve is fulfilled, and the requirement of process control working conditions is met. In order to achieve the purpose of quickly driving a part of rotary control valves such as ball valves and butterfly valves, a quick type angular travel actuator is often used for control. However, with the increase of the action speed of the angular travel actuator, the impact of the angular travel actuator and the valve at the closed position or the open position becomes serious, which directly affects the positioning accuracy, the service life and the operation reliability of the pneumatic actuator and the valve, and even affects the safety of the automatic control system.

SUMMERY OF THE UTILITY MODEL

The applicant provides an angular travel hydraulic actuator with a reasonable structure aiming at the defect of serious impact on opening and closing positions of the existing angular travel actuator, so that the impact on opening and closing positions is relieved, and the positioning precision and the operation reliability are ensured.

The utility model discloses the technical scheme who adopts as follows:

an angular travel hydraulic actuating mechanism comprises a shell, wherein a shifting fork shaft hinged with the shell is arranged in the shell, hydraulic cylinders are symmetrically arranged at two ends of the shell, a slide block is arranged at the end part of a hydraulic rod of each hydraulic cylinder, the slide block is sleeved on a fixed rod in the shell and is matched with a shifting fork on the shifting fork shaft to control the shifting fork shaft to rotate, a bidirectional hydraulic buffer is fixed on the slide block and is arranged in parallel with the slide block, the collision heads of the bidirectional hydraulic buffer respectively face two ends of the shell, and the length of the collision heads extending out of the slide block is about 20 mm; buffer spring is established to the both ends cover respectively of dead lever, and on buffer spring was fixed in the terminal surface of casing through annular spring holder, buffer spring's wire rod diameter was by thin thickening, and the both sides of shift fork are close to shift fork axle department and are equipped with spacing arch, are equipped with on the casing with spacing protruding cooperation counterbalance with this restriction shift fork swing angle's stop screw.

As a further improvement of the above technical solution:

the end part of the limit screw screwed into the shell is provided with a silica gel sleeve, and the thickness of the silica gel sleeve is 5 mm.

The cross section of the buffer spring is circular or elliptical.

The oil tank of the hydraulic cylinder is positioned on one side of the shell.

The utility model has the advantages as follows:

the utility model discloses a set up two-way hydraulic buffer on the slider, hydraulic buffer receives the kinetic energy of head motion to turn into the elastic energy of heat energy and fluid through hydraulic buffer to reduced the impact, realized the buffer protection to pneumatic actuator and its driven valve, make pneumatic actuator satisfy the requirement of quick-opening or quick-closing promptly, be unlikely to again to damage the spacing guiding mechanism in the casing, furthest's improvement the reliability and the life of product.

The utility model discloses a establish buffer spring at dead lever both ends cover, when buffer spring was collided to quick travel's slider, the kinetic energy of slider motion turned into elastic energy through buffer spring to the impact of slider has been reduced. Because the diameter of the wire rod of the buffer spring is changed from thin to thick along the direction departing from the sliding block, the speed of the sliding block is gradually reduced, and the buffer effect is further achieved.

The utility model discloses an install the silica gel cover at stop screw's tip, the thickness of silica gel cover is about 5mm, when stop screw is close in the quick swing of shift fork, at first the contact be stop screw's silica gel cover, the silica gel cover has protecting against shock buffer function, impact when can alleviating the declutch shift shaft fast turn-round.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a housing; 2. a fork shaft; 3. a limit screw; 4. a limiting bulge; 5. a shifting fork; 6. a silica gel sleeve; 7. an oil port; 8. a hydraulic cylinder; 9. a buffer spring; 10. a hydraulic lever; 11. a slider; 12. an oil tank; 13. fixing the rod; 14. a bi-directional hydraulic damper.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, the utility model discloses a casing 1 sets up a plurality of hydraulic fluid ports 7 on the casing. A shifting fork shaft 2 hinged with the shell 1 is arranged in the shell 1, hydraulic cylinders 8 are symmetrically arranged at two ends of the shell 1, and sliding blocks 11 are arranged at end parts of hydraulic rods 10 of the hydraulic cylinders 8. The sliding block 11 is sleeved on a fixing rod 13 in the shell 1 and can slide along the length direction of the fixing rod 13, and the sliding block 11 is matched with the shifting fork 5 on the shifting fork shaft 2 to control the shifting fork shaft 2 to rotate. The two-way hydraulic buffer 14 is arranged in parallel along the moving direction of the sliding block 11 on one side of the sliding block 11 close to the shell 1, two collided heads of the two-way hydraulic buffer respectively face to two ends of the shell 1, the length of the collided heads extending out of the sliding block 11 is about 20mm, when the sliding block 11 is driven by the hydraulic rod 10 to move rapidly, when the collided heads of the two-way hydraulic buffer 14 contact with the end face of the shell 1, the collided heads are compressed into the hydraulic buffer 14 to be contracted, kinetic energy of the motion of the collided heads is converted into heat energy and elastic energy of oil through the hydraulic buffer, so that impact is reduced, buffer protection of the pneumatic actuator and a valve driven by the pneumatic actuator is realized, the pneumatic actuator can meet the requirement of rapid opening or rapid closing, and the limit adjusting mechanism in the shell 1 cannot be damaged.

Buffer springs 9 are further respectively sleeved at two ends of the fixing rod 13, and the buffer springs 9 are fixed on the end face of the shell 1 through annular spring seats. The diameter of the wire of the buffer spring 9 is gradually or step-wise changed from thin to thick along the direction departing from the slide block 11, the diameter of the spring ring is unchanged, and the cross section of the buffer spring 9 is circular or elliptical. When the hydraulic rod 10 drives the sliding block 11 to move rapidly and is close to the buffer spring 9, the sliding block 11 firstly contacts the head part with the thinner wire diameter of the buffer spring 9, at the moment, the deformation compression speed of the buffer spring 9 is high, the resistance of the sliding block 11 is small, along with the movement of the sliding block 11, the deformation compression speed of the buffer spring 9 is gradually reduced from high to low, the elastic force is gradually increased, the resistance of the sliding block 11 is also gradually increased, the speed of the sliding block 11 is gradually reduced, and the buffering effect is further played.

Two sides of the shifting fork 5 are provided with a limiting bulge 4 near the shifting fork shaft 2, and the shell 1 is provided with two limiting screws 3 which are respectively matched and abutted against the limiting bulge 4 to limit the swing angle of the shifting fork 5. The limiting screw 3 is screwed into the upper end part of the shell 1 and is provided with a silica gel sleeve 6, the thickness of the silica gel sleeve 6 is preferably 5mm, and if the silica gel sleeve 6 is too thick, the rotating angle of the shifting fork 5 is influenced; if it is too thin, the buffering effect is poor. When the shifting fork 5 swings fast and approaches to the limit screw 3, the first contact is the silica gel sleeve 6 of the limit screw 3, and the silica gel sleeve 6 has an anti-impact buffering function and relieves impact when the shifting fork shaft 2 rotates fast.

The oil tank 12 of the hydraulic cylinder 8 is positioned on one side of the housing 1, so that the oil path between the oil tank 12 and the hydraulic cylinder 8 is shortest, and the hydraulic rod 10 can rapidly move.

The utility model discloses a establish buffer spring 9 at 13 both ends covers of dead lever, when buffer spring 9 was collided to quick travel's slider 11, the kinetic energy of slider 11 motion turned into elastic energy through buffer spring 9 to slider 11's impact has been reduced. Because the diameter of the wire rod of the buffer spring 9 is changed from thin to thick along the direction departing from the sliding block 11, the speed of the sliding block 11 is gradually reduced, the buffer effect is achieved, the requirement of quick opening or quick closing is met, the sliding block is not damaged, and the reliability and the service life of the product are improved to the maximum extent.

The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention.

Claims

1. An angular travel hydraulic actuator, characterized in that: the hydraulic buffer comprises a shell (1), wherein a shifting fork shaft (2) hinged with the shell (1) is arranged in the shell (1), hydraulic cylinders (8) are symmetrically arranged at two ends of the shell (1), a sliding block (11) is arranged at the end part of a hydraulic rod (10) of each hydraulic cylinder (8), the sliding block (11) is sleeved on a fixed rod (13) in the shell (1), the sliding block (11) is matched with a shifting fork (5) on the shifting fork shaft (2) to control the shifting fork shaft (2) to rotate, a bidirectional hydraulic buffer (14) is fixed by the sliding block (11), the bidirectional hydraulic buffer (14) and the sliding block (11) are arranged in parallel, the collision heads of the bidirectional hydraulic buffer (14) respectively face two ends of the shell (1), and the length of the collision heads extending out of the sliding block (11) is about 20 mm; buffer spring (9) are established respectively to the both ends cover of dead lever (13), and on buffer spring (9) were fixed in the terminal surface of casing (1) through annular spring seat, buffer spring (9) wire rod diameter was become thick by thin, and the both sides of shift fork (5) are close to shift fork axle (2) department and are equipped with spacing arch (4), are equipped with on casing (1) with spacing arch (4) cooperation offset with this restriction shift fork (5) swing angle's stop screw (3).

2. The angular stroke hydraulic actuator according to claim 1, wherein: the end part of the limit screw (3) screwed into the shell (1) is provided with a silica gel sleeve (6), and the thickness of the silica gel sleeve (6) is 5 mm.

3. The angular stroke hydraulic actuator according to claim 1, wherein: the cross section of the buffer spring (9) is circular or elliptical.

4. The angular stroke hydraulic actuator according to claim 1, wherein: the oil tank (12) of the hydraulic cylinder (8) is positioned on one side of the shell (1).