Pneumatic actuator

Abstract

The utility model discloses a pneumatic actuator which comprises a shell, an output shaft installed on the shell, a piston arranged in the shell in a sliding mode, a transmission gear arranged on the output shaft and a transmission rack installed in the shell, and a detachable assembly structure is arranged between the piston and the transmission rack. The assembly structure has an assembly state and a separation state, when the assembly structure is in the assembly state, the transmission rack is meshed with the transmission gear, a detachable positioning assembly is arranged between the transmission rack and the shell and / or between the transmission rack and the output shaft, and the positioning assembly positions the assembly structure to be in the assembly state. The utility model has the following advantages and effects: the transmission rack and the transmission gear can be independently replaced, so that the later maintenance cost of the product is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to an actuator, in particular to a 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 transmission mode includes gear transmission, which realizes the output of actuator power. When the output torque of the actuator is large and the torque cannot be effectively and smoothly transmitted, the torque force acts on the gear transmission structure, which is easy to cause damage to the gear transmission structure and cause tooth collapse. And the gear transmission structure will also reduce the transmission precision due to wear during long-term use, so the actuator needs to be replaced or repaired. Since the piston and the transmission rack of the existing actuator are integrated, if the transmission rack is damaged, the entire component needs to be replaced, which increases the maintenance cost of the actuator. The above problem gives birth to this improvement. SUMMARY

[0004] The purpose of the utility model is to provide a pneumatic actuator which can realize the separate replacement of the transmission rack, thereby reducing the maintenance cost of the product.

[0005] The above technical purpose of the utility model is realized by the following technical scheme: a pneumatic actuator, comprising a housing, an output shaft mounted on the housing, a piston slidingly arranged in the housing, a transmission gear arranged on the output shaft, and a transmission rack mounted in the housing, a detachable assembly structure is provided between the piston and the transmission rack, the assembly structure has an assembled state and a separated state, when the assembly structure is in the assembled state, the transmission rack is engaged with the transmission gear, a detachable positioning assembly is provided between the transmission rack and the housing and / or between the transmission rack and the output shaft, and the positioning assembly positions the assembly structure in the assembled state.

[0006] By adopting the above technical scheme, the positioning assembly is used to position the assembly structure in the assembled state, so that the transmission rack and the transmission gear are kept in engagement. When the transmission rack is damaged and needs to be replaced, the positioning assembly is disassembled, and the assembly structure is used to separate the transmission rack and the piston, so that the transmission rack can be replaced separately, thereby reducing the maintenance cost of the product.

[0007] Further, the assembly structure comprises an assembly block and an assembly slot for inserting the assembly block, and the assembly block and the assembly slot are matched to limit the piston and the transmission rack in the movement direction of the piston.

[0008] By using the above technical scheme, the assembly block inserted into the assembly slot can limit the piston and the transmission rack in the movement direction of the piston, so that the piston in movement can drive the transmission rack to move synchronously.

[0009] Further, the positioning assembly is arranged between the transmission rack and the output shaft.

[0010] By using the above technical scheme, the machining and assembly work is simpler and the cost is lower.

[0011] Further, the positioning assembly comprises a positioning strip arranged on the transmission rack and a positioning sliding groove arranged on the output shaft and for inserting the positioning strip, the positioning sliding groove is arranged in a circular ring shape around the center of the output shaft, and the positioning sliding groove and the positioning strip are slidingly matched.

[0012] By using the above technical scheme, the positioning strip inserted into the positioning sliding groove positions the assembly structure, so that the assembly structure is kept in the assembled state. And by arranging the positioning sliding groove in a circular ring shape, the positioning function is ensured, and the normal rotation of the output shaft is not interfered, so as to ensure the implementability of the arrangement structure.

[0013] Further, the two side walls of the positioning sliding groove form a compensation inclined surface which extends outward and gradually expands in the opening direction of the positioning sliding groove, and the positioning strip has a matching inclined surface corresponding to the position of the compensation inclined surface.

[0014] By using the above technical scheme, the assembly tolerance of the positioning sliding groove and the positioning strip can be compensated by the arrangement structure, so as to ensure the precision of the meshing position of the transmission rack and the transmission gear, and prolong the service life of the two.

[0015] Further, the transmission gear has a through hole for the output shaft to pass through, and a detachable linkage structure is arranged between the transmission gear and the output shaft to link the rotation directions of the two.

[0016] By using the above technical scheme, the detachable linkage of the transmission gear and the output shaft is realized by the arrangement structure, and the transmission gear can be replaced alone, so as to reduce the maintenance cost in the later period.

[0017] Further, the detachable linkage structure comprises a key groove arranged on the transmission gear and the output shaft, and a connecting key arranged in the key groove.

[0018] By adopting the technical scheme, the detachable linkage of the two is realized through the key connection, and the structure is simple and the cost is low.

[0019] Further, the output shaft is provided with a limiting ring below the transmission gear and a snap ring above the transmission gear.

[0020] By adopting the technical scheme, the installation stability of the transmission gear is ensured through the setting structure.

[0021] In summary, the utility model has the following beneficial effects: the utility model can realize the separate replacement of the transmission rack and the transmission gear, so as to reduce the later maintenance cost of the product. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the embodiment;

[0023] Figure 2 It is another structural schematic view of the embodiment;

[0024] Figure 3 It is Figure 2 It is an enlarged view of the A part in the middle;

[0025] Figure 4 It is a structural schematic view of the output shaft in the embodiment;

[0026] Figure 5 It is a partial exploded view of the embodiment.

[0027] In the figure: 1, shell; 2, output shaft; 3, piston; 4, transmission gear; 5, transmission rack; 61, assembly plug; 62, assembly slot; 71, positioning strip; 72, positioning sliding groove; 8, compensation inclined surface; 9, matching inclined surface; 10, through hole; 11, key groove; 12, connecting key; 13, limiting ring; 14, snap ring; 15, straight-through joint. DETAILED DESCRIPTION

[0028] The utility model will be further explained in detail in combination with the drawings.

[0029] Reference Figures 1 to 5The utility model provides a pneumatic actuator, including shell 1, the output shaft 2 of rotation installation in shell 1, the piston 3 of sliding setting in shell 1, the transmission gear 4 of setting in output shaft 2 and the transmission rack 5 of installing in shell 1, the piston 3 is with transmission rack 5 between being equipped with the detachable assembly structure of assembling, and the assembly structure has the assembling state and the separation state, when the assembly structure is in the assembling state, transmission rack 5 is engaged with transmission gear 4.

[0030] The assembly structure includes an assembly block 61 integrally provided on the transmission rack 5 and an assembly slot 62 formed on the piston 3 and into which the assembly block 61 is inserted, and the assembly block 61 cooperates with the assembly slot 62 to limit the transmission rack 5 and the piston 3 in the movement direction of the piston 3. Preferably, two pistons 3 are provided, and a straight-through joint 15 is fixedly installed on the shell 1.

[0031] The positioning assembly is provided between the transmission rack 5 and the output shaft 2, and includes a positioning strip 71 integrally provided on the transmission rack 5 and a positioning sliding groove 72 formed on the output shaft 2 and into which the positioning strip 71 is inserted. The positioning sliding groove 72 is annularly arranged around the center of the output shaft 2 to form a ring, and the positioning sliding groove 72 and the positioning strip 71 are in sliding cooperation. The two side walls of the positioning sliding groove 72 are outwardly extended and gradually flared to form a compensation slope 8, and the positioning strip 71 is formed with a matching slope 9 corresponding to the position of the compensation slope 8. The positioning strip 71, the assembly block 61 and the transmission rack 5 are integrally formed.

[0032] The transmission gear 4 is formed with a through hole 10 through which the output shaft 2 passes, and a detachable linkage structure is provided between the transmission gear 4 and the output shaft 2 to link the rotation directions of the transmission gear 4 and the output shaft 2. The detachable linkage structure includes a key groove 11 formed on the transmission gear 4 and the output shaft 2 and a connecting key 12 provided in the key groove 11. The output shaft 2 is integrally provided with a limiting ring 13 below the transmission gear 4 and is clamped with a clamping ring 14 above the transmission gear 4.

[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 comprising a housing (1), an output shaft (2) mounted to the housing (1), a piston (3) slidingly disposed within the housing (1), a transmission gear (4) disposed on the output shaft (2), and a transmission rack (5) mounted within the housing (1), characterized in that: The detachable assembly structure is provided between the piston (3) and the transmission rack (5), and has an assembled state and a separated state.

2. The pneumatic actuator of claim 1, wherein: The assembly structure includes an assembly block (61) and an assembly slot (62) for inserting the assembly block (61), and the assembly block (61) is limited in the movement direction of the piston (3) in cooperation with the assembly slot (62).

3. The pneumatic actuator of claim 1, wherein: The positioning assembly is provided between the transmission rack (5) and the output shaft (2).

4. The pneumatic actuator of claim 3, wherein: The positioning assembly includes a positioning strip (71) provided on the transmission rack (5) and a positioning sliding groove (72) provided on the output shaft (2) and for inserting the positioning strip (71), and the positioning sliding groove (72) is provided around the center of the output shaft (2) to form a circular ring, and the positioning sliding groove (72) is in sliding cooperation with the positioning strip (71).

5. The pneumatic actuator of claim 4, wherein: The two side walls of the positioning sliding groove (72) form a compensation inclined surface (8) which extends outward and gradually expands in the opening direction of the positioning sliding groove (72), and the positioning strip (71) has a matching inclined surface (9) corresponding to the position of the compensation inclined surface (8).

6. The pneumatic actuator of claim 1, wherein: The transmission gear (4) has a through hole (10) for the output shaft (2) to pass through, and a detachable linkage structure is provided between the transmission gear (4) and the output shaft (2) to constitute the turning linkage of the two.

7. The pneumatic actuator of claim 6, wherein: The detachable linkage structure includes a key groove (11) provided on the transmission gear (4) and the output shaft (2), and a connecting key (12) provided in the key groove (11).

8. The pneumatic actuator of claim 6, wherein: The output shaft (2) has a limiting ring (13) below the transmission gear (4) and a clamping ring (14) above the transmission gear (4).

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