Shifting fork pneumatic actuator

Abstract

The utility model discloses a shifting fork pneumatic actuator which comprises a cylinder body, an output shaft rotationally installed on the cylinder body, a piston arranged in the cylinder body in a sliding mode and a shifting fork assembly in linkage with the piston and the output shaft, and the output shaft is divided into a butt joint section with a butt joint end and a stop section with a stop end. The cylinder body is provided with a butt joint hole which is communicated with the locking section and the outside in a sealing mode, a driving piece is arranged outside the cylinder body, the driving piece and the locking section are provided with locking assemblies which are connected through the butt joint hole, and the locking assemblies are driven by the driving piece to have a locking state for limiting rotation of the output shaft and an unlocking state for normal rotation of the output shaft. The shifting fork assembly has the following advantages and effects that the service life of the shifting fork assembly can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to an actuator, in particular to a yoke pneumatic actuator. BACKGROUND

[0002] The actuator is an important component of the automatic control system. Its function is to accept the control signal sent by the controller, change the size of the controlled medium, and maintain the controlled variable at the required value or within a certain range. The actuator can be divided into three categories according to its energy form: pneumatic, hydraulic and electric. Different types of actuators have their own characteristics and application scenarios, and users should choose the appropriate actuator type according to actual needs.

[0003] The existing actuator includes a cylinder body, an output shaft rotatably installed on the cylinder body, a piston slidably arranged in the cylinder body, and a yoke assembly that links the piston and the output shaft. Because the actuator is widely used in various fields and the working conditions are very complex, in some special working conditions, when the actuator is not working, the output shaft will also be subjected to a rotating force from the working condition, and this rotating force will act on the yoke assembly through the output shaft and be borne by the yoke assembly. Due to the structure of the yoke assembly, if it is subjected to long-term stress, it is easy to deform or even break, thereby reducing the service life of the yoke assembly. SUMMARY

[0004] The purpose of the utility model is to provide a yoke pneumatic actuator that can prolong the service life of the yoke assembly.

[0005] The above technical purpose of the utility model is achieved by the following technical scheme: a yoke pneumatic actuator, comprising a cylinder body, an output shaft rotatably installed on the cylinder body, a piston slidably arranged in the cylinder body, and a yoke assembly that links the piston and the output shaft. The output shaft is divided into a butt joint section with a butt joint end and a stop section with a stop end. The cylinder body is provided with a butt joint hole that sealingly communicates the stop section with the outside. The cylinder body is provided with a driving member. The driving member and the stop section are provided with a stop assembly connected through the butt joint hole. The stop assembly is driven by the driving member to have a stop state that restricts the rotation of the output shaft and a release state that allows the normal rotation of the output shaft.

[0006] By adopting the above technical scheme, the driving member controls the stop assembly to switch between the stop state and the release state. When the stop assembly is in the release state, the piston drives the output shaft to rotate through the yoke assembly to perform normal control operation on the output shaft. When the actuator is not working, the stop assembly is switched to the stop state, and the stop assembly restricts the rotation of the output shaft and bears the rotating force on the output shaft, thereby reducing the stress on the yoke assembly when the actuator is not working and prolonging the service life of the yoke assembly.

[0007] Further, the stop section extends into the docking hole and is in sealing and rotating fit with the docking hole, and the driving member is a driving cylinder, and the telescopic rod of the driving cylinder is coaxially arranged with the stop section.

[0008] By adopting the technical scheme, the control of the stop assembly is realized through the setting structure, and the sealing property of the cylinder body is well ensured.

[0009] Further, the stop assembly comprises a stop groove arranged at the end of the stop section and a stop rod connected with the telescopic rod of the driving cylinder and extending into the stop groove, and the stop rod is in rotating fit with the stop groove.

[0010] By adopting the technical scheme, the telescopic rod of the driving cylinder drives the stop rod to extend or retract to control the stop rod to abut against or leave the bottom of the stop groove, so as to realize the stop purpose of the output shaft, and the setting structure does not interfere with the normal rotation of the output shaft through the rotating fit mode.

[0011] Further, the end of the stop rod is provided with a first stop gear disc, and the bottom of the stop groove is provided with a second stop gear disc which can mesh with the first stop gear disc.

[0012] By adopting the technical scheme, the rotation of the output shaft is limited through whether the first stop gear disc and the second stop gear disc mesh or not, so that the setting structure can better bear the rotation force on the output shaft, thereby achieving the effective and more stable stop purpose.

[0013] Further, the driving cylinder is fixed to the cylinder body through bolts, and a separation sleeve which is abutted against by the driving cylinder is arranged between the end face of the driving cylinder facing the cylinder body and the cylinder body, and the separation sleeve is sleeved on the outer circle of the docking hole.

[0014] By adopting the technical scheme, the docking hole is blocked from the outside world to avoid the pollution of the docking hole.

[0015] Further, a force bearing assembly which bears the force from the driving cylinder is arranged between the docking section and the cylinder body.

[0016] By adopting the technical scheme, the driving force of the driving cylinder on the output shaft is borne through the force bearing assembly, so that the axial displacement of the output shaft is avoided, thereby ensuring the accuracy of the installation of the output shaft.

[0017] Further, the force bearing assembly comprises a force bearing table which surrounds the output shaft and is arranged on the inner wall of the cylinder body, a force bearing ring which is fixedly sleeved on the docking section, and a plane bearing which is arranged between the force bearing ring and the force bearing table.

[0018] By adopting the technical scheme, the shaft line stress on the output shaft is borne by the plane bearing structure and the smooth rotation of the output shaft is ensured.

[0019] Further, the plane bearing is embedded in the groove of the force bearing table.

[0020] By adopting the technical scheme, the plane bearing is embedded in the groove of the force bearing table.

[0021] By adopting the technical scheme, the plane bearing is embedded in the groove of the force bearing table. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure schematic view of the embodiment;

[0023] Figure 2 Another structure schematic view of the embodiment;

[0024] Figure 3 A Figure 2 Enlarged view of A part;

[0025] Figure 4 B Figure 2 Enlarged view of B part.

[0026] In the figure: 1, cylinder body; 2, output shaft; 21, butt joint section; 22, stop section; 3, piston; 4, fork assembly; 41, linkage shaft; 42, fork; 5, butt joint hole; 6, stop assembly; 61, stop groove; 62, stop rod; 7, driving cylinder; 81, first stop gear disc; 82, second stop gear disc; 9, bolt; 10, isolation sleeve; 11, force bearing assembly; 111, force bearing table; 112, force bearing ring; 113, plane bearing; 12, groove; 13, straight-through joint. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings.

[0028] Reference Figures 1 to 4 A fork pneumatic actuator, comprising a cylinder body 1, an output shaft 2 sealingly and rotatably installed in the cylinder body 1, a piston 3 slidingly arranged in the cylinder body 1 and a fork assembly 4 linking the piston 3 and the output shaft 2. The output shaft 2 is divided into a butt joint section 21 having a butt joint end and a stop section 22 having a stop end, and the cylinder body 1 is provided with a butt joint hole 5 sealingly communicating the stop section 22 with the outside. The cylinder body 1 is provided with a driving member, and the driving member and the stop section 22 are provided with a stop assembly 6 connected through the butt joint hole 5, and the stop assembly 6 is driven by the driving member to have a stop state limiting the rotation of the output shaft 2 and a release state allowing the normal rotation of the output shaft 2.

[0029] The stop section 22 extends into the docking hole 5 and is in sealed rotary fit with the docking hole 5, the driving member is a driving cylinder 7, and the telescopic rod of the driving cylinder 7 is coaxially arranged with the stop section 22. The stop assembly 6 comprises a stop groove 61 arranged at the end of the stop section 22 and a stop rod 62 integrally connected with the telescopic rod of the driving cylinder 7 and extending into the stop groove 61, and the stop rod 62 is in rotary fit with the stop groove 61. The end of the stop rod 62 is integrally provided with a first stop gear disc 81, and the bottom of the stop groove 61 is fixedly provided with a second stop gear disc 82 which can be engaged with the first stop gear disc 81, and the first stop gear disc 81 and the second stop gear disc 82 are end face gear discs or end face gears.

[0030] The driving cylinder 7 is fixed to the cylinder body 1 through bolts 9, and the bolts 9 are threadedly connected with the driving cylinder 7 and the cylinder body 1. The end face of the driving cylinder 7 facing the cylinder body 1 is provided with an isolation sleeve 10 which is abutted by the driving cylinder 7, and the isolation sleeve 10 is sleeved on the outer circle of the docking hole 5.

[0031] The bearing assembly 11 which bears the force applied by the driving cylinder 7 is arranged between the docking section 21 and the cylinder body 1. The bearing assembly 11 comprises a bearing table 111 which surrounds the output shaft 2 and is integrally arranged on the inner wall of the cylinder body 1, a bearing ring 112 which is integrally sleeved on the docking section 21, and a plane bearing 113 which is arranged between the bearing ring 112 and the bearing table 111. The plane bearing 113 is embedded in the groove 12 of the bearing table 111.

[0032] The straight-through joint 13 is arranged on the cylinder body 1, the pistons 3 are preferably two, the shift fork assembly 4 comprises a linkage shaft 41 fixedly arranged on each piston 3 and a shift fork 42 fixedly arranged on the output shaft 2, and the linkage shaft 41 is located in the linkage groove of the shift fork 42.

[0033] The specific embodiment is only an explanation of the utility model, and is not a limitation of the utility model. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the utility model, they are protected by the patent law.

Claims

1. A pneumatic actuator for shift fork, comprising a cylinder (1), an output shaft (2) rotatably mounted on the cylinder (1), a piston (3) slidably arranged in the cylinder (1), and a shift fork assembly (4) connecting the piston (3) and the output shaft (2), characterized in that: The output shaft (2) is divided into a docking section (21) with a docking end and a stop section (22) with a stop end, the cylinder body (1) is provided with a docking hole (5) sealingly connecting the stop section (22) with the outside, the cylinder body (1) is externally provided with a driving member, the driving member and the stop section (22) are provided with a stop assembly (6) connected through the docking hole (5), the stop assembly (6) is driven by the driving member to have a stop state limiting rotation of the output shaft (2) and a release state allowing normal rotation of the output shaft (2).

2. The shift fork pneumatic actuator of claim 1, wherein: The stop section (22) extends into the docking hole (5) and sealingly rotates with the docking hole (5), the driving member is a driving cylinder (7), and the driving cylinder (7) is coaxially provided with the stop section (22).

3. The shift fork pneumatic actuator of claim 2, wherein: The stop assembly (6) comprises a stop groove (61) provided at an end of the stop section (22) and a stop rod (62) connected to the driving cylinder (7) and extending into the stop groove (61), and the stop rod (62) is in rotational cooperation with the stop groove (61).

4. The shift fork pneumatic actuator of claim 3, wherein: The stop rod (62) is provided with a first stop gear (81) at an end thereof, and the bottom of the stop groove (61) is provided with a second stop gear (82) capable of meshing with the first stop gear (81).

5. The shift fork pneumatic actuator of claim 2, wherein: The driving cylinder (7) is fixed to the cylinder body (1) by bolts (9), and the end face of the driving cylinder (7) facing the cylinder body (1) is provided with an isolation sleeve (10) abutting against the driving cylinder (7), and the isolation sleeve (10) is sleeved on the outer circle of the docking hole (5).

6. The shift fork pneumatic actuator of claim 3, wherein: The docking section (21) and the cylinder body (1) are provided with a force bearing assembly (11) bearing force from the driving cylinder (7).

7. The shift fork pneumatic actuator of claim 6, wherein: The force bearing assembly (11) comprises a force bearing table (111) surrounding the output shaft (2) and provided on the inner wall of the cylinder body (1), a force bearing ring (112) fixedly sleeved on the docking section (21), and a plane bearing (113) provided between the force bearing ring (112) and the force bearing table (111).

8. The shift fork pneumatic actuator of claim 7, wherein: The plane bearing (113) is embedded in the groove (12) of the force bearing table (111).

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