Shifting fork type pneumatic actuator

Abstract

The utility model discloses a shifting fork type pneumatic actuator, and particularly relates to the technical field of pneumatic actuators, which comprises a shifting fork box, a fixed base is fixedly connected to the bottom end in the shifting fork box, a supporting rod is fixedly connected to the top end of the fixed base, a first cover plate is fixedly connected to the top end of the supporting rod, and a rotary drum is mounted on the outer side of the supporting rod. By arranging the supporting rod, the rotating cylinder, the connecting plates, the first sliding groove, the second sliding groove, the supporting sliding rods, the fixing rod and the connecting cylinder, compared with the prior art, the supporting rod can support the two connecting plates to drive the rotating cylinder to swing left and right, and then the two supporting sliding rods and the fixing rod slide in the first sliding groove and the second sliding groove; the push rod can be connected with the connecting plate more stably and tightly in the moving process, the push rod is effectively prevented from deviating or shaking in the moving process, the stability of the push rod is enhanced, and meanwhile friction and abrasion of the push rod in the moving process can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, and more specifically, to a scotch yoke type pneumatic actuator. Background Art

[0002] A pneumatic actuator is an actuator that uses air pressure to open, close or adjust a valve. It is also called a pneumatic actuator or a pneumatic device. The pneumatic actuator adjusts the direction of the air in and out of the cylinder to make the piston move in different directions in the cylinder. The piston drives the fork to move, the fork drives the turntable to rotate, and the turntable drives the output shaft to rotate, thereby achieving control of the valve.

[0003] Due to the long cylinder stroke, the gear transmission causes large mutual damping, resulting in slow valve response speed. At the same time, the transmission and structure are relatively complex, and the manufacturing cost is high; the load-bearing capacity and strength are not high, resulting in reduced reliability.

[0004] After searching, a Chinese patent with application number CN201822033608.0 discloses a slewing fork type pneumatic actuator, which is provided with a slewing fork inside the valve body and a pin on the piston rod. The pin slides on the inner wall of the pin. When the piston rod moves axially, the slewing fork is driven by the pin to swing at an angle, thereby realizing the rotation of the valve shaft installed on the slewing fork. Since the U-shaped claw and the rotation center of the slewing fork form a transmission principle of a force-saving lever, when the piston rod slides for a long stroke, the U-shaped claw has little resistance, so the rotation response speed of the valve shaft is fast.

[0005] When the above-mentioned yoke-type pneumatic actuator is actually used, the yoke opening is prone to breakage when subjected to torque or impact force, causing the yoke to deform or be damaged when performing high-torque tasks, and to fall off from the push rod, causing the matching clearance between the yoke and the push rod to increase, thereby reducing the transmission efficiency. Utility Model Content

[0006] In order to overcome the above defects of the prior art, the utility model provides a scotch yoke type pneumatic actuator to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A scotch fork type pneumatic actuator comprises a scotch fork box, the bottom end of the scotch fork box is fixedly connected to a fixed base, the top of the fixed base is fixedly connected to a support rod, the top of the support rod is fixedly connected to a first cover plate, a rotating cylinder is installed on the outside of the support rod, the upper and lower ends of the right side of the rotating cylinder are fixedly connected to connecting plates, the surfaces of the two connecting plates are provided with a first slide groove, the two first slide grooves are provided with a second slide groove at both ends of the inner sides, a plurality of supporting slide rods are installed inside the second slide grooves, the outer sides of the upper and lower supporting slide rods are fixedly connected to a fixed rod, one end of the two fixed rods is fixedly connected to the second cover plate, and the other ends of the two fixed rods are fixedly connected to the connecting cylinder.

[0009] By adopting the above technical scheme: the fixed base is fixedly connected to the bottom end of the inner side of the fork box, the bottom end of the support rod is fixedly connected to the top of the fixed base, the first cover plate is fixedly connected to the top end of the support rod, the inner side of the rotating cylinder is rotatably connected to the outer side of the support rod, one side of the upper and lower connecting plates is fixedly connected to the right side of the rotating cylinder, the surfaces of the two connecting plates are provided with a first slide groove, the two second slide grooves are provided on the inner side of the first slide groove, the two supporting slide rods are installed on the inner side of the second slide groove, the two supporting slide rods are plugged and fixed inside the fixed rod, one end of the two fixed rods is fixedly connected to the second cover plate, and the other end of the two fixed rods is fixedly connected to the connecting cylinder.

[0010] As a further description of the above technical solution: a push rod is fixedly connected to the inner side of the connecting cylinder.

[0011] By adopting the above technical solution, the inner side of the connecting tube and the outer side of the push rod are plugged and fixed.

[0012] As a further description of the above technical solution: a piston is fixedly connected to the left end of the push rod, and a cylinder body is arranged on the outside of the piston.

[0013] By adopting the above technical solution: the piston is fixedly connected to the left end of the push rod, and the cylinder body is installed on the outside of the piston.

[0014] As a further description of the above technical solution: the right end of the push rod is fixedly connected to a slide cylinder, and the outer side of the right end of the slide cylinder is fixedly connected to a baffle.

[0015] By adopting the above technical solution: the left end of the slide cylinder is fixedly connected with the right end of the push rod, and the inner side of the baffle is plugged and fixed with the outer side of the right end of the slide cylinder.

[0016] As a further description of the above technical solution: a limit rod is arranged inside the slide cylinder, one end of the limit rod is fixedly connected to a spring cylinder, and a spring is arranged inside the spring cylinder.

[0017] By adopting the above technical solution: the inner side of the slide cylinder is slidably connected with the outer side of the limit rod, the right end of the limit rod is fixedly connected with one end of the inner side of the spring cylinder, and the spring is installed inside the spring cylinder.

[0018] As a further description of the above technical solution: connecting blocks are installed at the connection between the left and right sides of the fork box and the cylinder body and the spring cylinder.

[0019] By adopting the above technical solution: the two connecting blocks are installed at the connection between the cylinder body and the spring cylinder and the left and right sides of the fork box.

[0020] As a further description of the above technical solution: the two supporting slide bars are both slidably connected inside the second slide groove, and the two fixing bars are both slidably connected inside the first slide groove.

[0021] By adopting the above technical solution: the inner sides of the two second sliding grooves are both slidably connected to the outer sides of the supporting sliding rods, and the inner sides of the two fixing rods are both slidably connected to the outer sides of the first sliding grooves.

[0022] Technical effects and advantages of the utility model:

[0023] 1. By arranging a support rod, a rotating drum, a connecting plate, a first slide groove, a second slide groove, a support slide rod, a fixed rod and a connecting drum, compared with the prior art, the support rod can support the two connecting plates to drive the rotating drum to swing left and right, and then the two support slide rods and the fixed rod slide inside the first slide groove and the second slide groove, so that the push rod can be more stably and tightly connected with the connecting plate during the movement, effectively preventing the push rod from deflecting or shaking during the movement, enhancing the stability of the push rod, and helping to reduce the friction and wear of the push rod during the movement;

[0024] 2. By setting a slide cylinder, a baffle, a limit rod and a spring, compared with the prior art, the movement of the slide cylinder is used to drive the baffle to squeeze the spring, which is convenient for generating movement through the compression and recovery of the spring, thereby achieving the reset function. The inner side of the slide cylinder is moved on the outer side of the limit rod, so that the slide cylinder can stably drive the push rod to move, thereby improving the stability of the push rod movement, preventing the push rod from excessive displacement or damage, and thus improving the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 This is a schematic diagram of the connection block structure of the utility model.

[0027] Figure 3 It is a schematic diagram of the limit rod structure of the utility model.

[0028] Figure 4 This is a schematic diagram of the second chute structure of the utility model.

[0029] Figure 5 This is a schematic diagram of the baffle structure of the utility model.

[0030] Figure 6 For the utility model Figure 5 Schematic diagram of the structure of the enlarged view of part A.

[0031] The accompanying drawings are marked as follows: 1. fork box; 2. fixed base; 3. support rod; 4. first cover plate; 5. rotating cylinder; 6. connecting plate; 7. first slide groove; 8. second slide groove; 9. supporting slide rod; 10. fixed rod; 11. second cover plate; 12. connecting cylinder; 13. push rod; 14. piston; 15. cylinder body; 16. slide cylinder; 17. baffle; 18. limit rod; 19. spring; 20. spring cylinder; 21. connecting block. DETAILED DESCRIPTION

[0032] 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.

[0033] The embodiment of the present application discloses a slewing fork pneumatic actuator, including a slewing fork box 1, a fixed base 2 is fixedly connected to the bottom end of the slewing fork box 1, a support rod 3 is fixedly connected to the top of the fixed base 2, a first cover plate 4 is fixedly connected to the top of the support rod 3, a rotating cylinder 5 is installed on the outside of the support rod 3, and a connecting plate 6 is fixedly connected to the upper and lower ends of the right side of the rotating cylinder 5, a first slide groove 7 is opened on the surface of the two connecting plates 6, and a second slide groove 8 is opened on both ends of the inner sides of the two first slide grooves 7, and a plurality of supporting slide rods 9 are installed inside the second slide grooves 8, and a fixed rod 10 is fixedly connected to the outer sides of the upper and lower supporting slide rods 9, and one end of the two fixed rods 10 is fixedly connected to the second cover plate 11, and the other end of the two fixed rods 10 is fixedly connected to the connecting cylinder 12, and the two supporting The sliding rods 9 are all slidably connected inside the second sliding groove 8, and the two fixed rods 10 are all slidably connected inside the first sliding groove 7. The air source is filled through the right side of the piston 14, and the air pressure pushes the piston 14 to move to the left, so that the piston 14 mobilizes the push rod 13 to move to the left, and the push rod 13 drives the upper and lower fixed rods 10 to slide inside the first sliding groove 7 through the connecting tube 12. The two fixed rods 10 both drive the supporting sliding rod 9 to slide inside the second sliding groove 8, and the push rod 13 is used to move to the left, so as to drive the rotating drum 5 to rotate left and right on the outside of the support rod 3 through the two connecting plates 6. The two second sliding grooves 8 provide a limiting effect on the supporting sliding rod 9, so that the two fixed rods 10 are more tightly connected to the connecting plate 6, thereby enhancing the stability of the movement of the push rod 13.

[0034] Reference Figure 1As shown, a push rod 13 is fixedly connected to the inner side of the connecting tube 12, a piston 14 is fixedly connected to the left end of the push rod 13, a cylinder body 15 is arranged on the outer side of the piston 14, and the opening and closing of the valve can be controlled by moving the piston 14 left and right.

[0035] Reference Figure 3 and 5 As shown, the right end of the push rod 13 is fixedly connected to a slide cylinder 16, and a baffle 17 is fixedly connected to the outer side of the right end of the slide cylinder 16. A limit rod 18 is arranged inside the slide cylinder 16, and one end of the limit rod 18 is fixedly connected to a spring cylinder 20, and a spring 19 is arranged inside the spring cylinder 20. The spring 19 is compressed and restored to generate thrust, which can push the baffle 17 to drive the slide cylinder 16 to move outside the limit rod 18. The movement of the slide cylinder 16 drives the push rod 13 to move to the right side, thereby driving the piston 14 to move to the right side, and can push the valve to close. At the same time, the limit rod 18 provides stability for the movement of the push rod 13, thereby improving the safety of the system.

[0036] Reference Figure 2 As shown, connecting blocks 21 are installed at the connection between the left and right sides of the fork box 1 and the cylinder body 15 and the spring cylinder 20. The two connecting blocks 21 can be used to seal the connection between the cylinder body 15 and the spring cylinder 20 and the fork box 1, thereby effectively preventing gas leakage when the cylinder body 15 is filled with air source.

[0037] Working principle of the utility model: The utility model designs a scotch fork type pneumatic actuator, the specific structure is as shown in the attached manual Figure 1-6 As shown, in the technical solution, through the mutual cooperation between various structures, when the air source is filled into the right side of the piston 14, the air pressure pushes the piston 14 to move to the left, so that the piston 14 drives the push rod 13 to move to the left, so that the push rod 13 drives the two supporting slide bars 9 to slide inside the second slide groove 8 through the connecting tube 12, so that the two supporting slide bars 9 drive the two fixed rods 10 to move inside the first slide groove 7, and the inner side of the rotating cylinder 5 is rotatably connected with the outer side of the supporting rod 3, so that the two fixed rods 10 move and drive the rotating cylinder 5 to move in the supporting groove 7 through the two connecting plates 6. The outer side of the support rod 3 swings left and right, the push rod 13 moves to the left and drives the slide 16 to move to the left at the same time, and then the slide 16 drives the baffle 17 to squeeze the spring 19 inside the spring cylinder 20, so as to support the piston 14 to move to the left, thereby pushing the valve to open, and then when the right side of the piston 14 stops delivering gas source, the thrust of the spring 19 rebounds to push the slide 16 to drive the push rod 13 to move to the right, and the two fixed rods 10 drive the connecting plate 6 to move to the right, and at the same time, the piston 14 can be pulled to move to the right, thereby pushing the valve to close.

[0038] Among them, the drawings of the embodiments disclosed in the present utility model only involve structures related to the embodiments disclosed in the present utility model, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0039] The contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited and can be determined using conventional equipment. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the prior art, and will not be described here;

[0040] Finally: The above are only preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A scotch fork type pneumatic actuator, comprising a scotch fork box (1), characterized in that: The bottom end of the fork box (1) is fixedly connected to a fixed base (2), the top of the fixed base (2) is fixedly connected to a support rod (3), the top of the support rod (3) is fixedly connected to a first cover plate (4), a rotating cylinder (5) is installed on the outside of the support rod (3), the upper and lower ends of the right side of the rotating cylinder (5) are fixedly connected to connecting plates (6), the surfaces of the two connecting plates (6) are provided with first slide grooves (7), the inner ends of the two first slide grooves (7) are provided with second slide grooves (8), a plurality of second slide grooves (8) are installed with supporting slide rods (9), the outer sides of the upper and lower supporting slide rods (9) are fixedly connected to fixed rods (10), one end of the two fixed rods (10) is fixedly connected to a second cover plate (11), and the other end of the two fixed rods (10) is fixedly connected to a connecting cylinder (12).

2. The scotch fork pneumatic actuator according to claim 1, characterized in that: A push rod (13) is fixedly connected to the inner side of the connecting tube (12).

3. The scotch fork pneumatic actuator according to claim 2, characterized in that: The left end of the push rod (13) is fixedly connected to a piston (14), and a cylinder body (15) is arranged outside the piston (14).

4. The scotch fork pneumatic actuator according to claim 2, characterized in that: The right end of the push rod (13) is fixedly connected to a slide cylinder (16), and the outer side of the right end of the slide cylinder (16) is fixedly connected to a baffle (17).

5. The scotch fork pneumatic actuator according to claim 4, characterized in that: A limiting rod (18) is arranged inside the slide cylinder (16), one end of the limiting rod (18) is fixedly connected to a spring cylinder (20), and a spring (19) is arranged inside the spring cylinder (20).

6. The scotch fork pneumatic actuator according to claim 1, characterized in that: Connecting blocks (21) are installed at the connection points between the left and right sides of the fork box (1) and the cylinder body (15) and the spring cylinder (20).

7. The scotch fork pneumatic actuator according to claim 1, characterized in that: The two supporting slide bars (9) are both slidably connected inside the second slide groove (8), and the two fixing bars (10) are both slidably connected inside the first slide groove (7).

Images