Gear rack pneumatic actuator

Abstract

The utility model relates to the technical field of pneumatic actuators, in particular to a gear and rack pneumatic actuator which comprises an actuator body, containing grooves are formed in the two ends of the actuator body, piston bodies are connected to the inner sides of the containing grooves in a sliding mode, and a gear column is rotationally connected to the center of the interior of the actuator body. Racks are clamped to the opposite faces of the two sets of piston bodies through quick mounting mechanisms, the tooth shapes of the racks and gear columns are involute tooth shapes, each quick mounting mechanism comprises a locking assembly, a rubber pad, an unlocking assembly and a closing assembly, the locking assemblies are used for locking the positions of the racks, the unlocking assemblies are used for unlocking the racks, and the closing assemblies are used for closing the racks. The closing assembly is used for closing an operation part of the unlocking assembly; the rack separating device is simple in structure and convenient to operate, workers can conveniently and rapidly separate aged and abraded racks, the labor amount of the workers is reduced, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic actuator technical field, concretely relates to a gear and rack pneumatic actuator. BACKGROUND

[0002] Pneumatic actuator is a kind of execution device for opening and closing valve, is widely used in petrochemical and metallurgical industries, most are used in remote control, the execution mechanism of current pneumatic actuator mainly has piston type, fork type, diaphragm type and gear and rack type, among them, gear and rack type pneumatic actuator is simple in structure, small in size, and beautiful in appearance, so application is very extensive. Gear and rack type pneumatic actuator is most common with integrated cylinder, it has many imperfect places: one, piston ring, piston sealing ring and rack bearing pad on piston rack assembly are vulnerable parts, need to be replaced frequently Although rack and piston have longer service life, but also can be damaged, also need to be replaced, however, almost all integrated cylinder pneumatic actuators need to be first removed from valve body when internal components are repaired and replaced, then repair and replace, time-consuming and laborious and affect production, two, when most pneumatic actuators open and close valve, stroke limit is completed by limiting screw on cylinder body, limiting limit block or cam installed on upper part of gear shaft, since the block is small in size, so resistance arm is also small, because torque is the product of force arm and force, so the block bears resistance when limiting, so the block is damaged fast, maintenance frequency is high, service life is reduced, and simultaneously, valve opening and closing position is misaligned.

[0003] In order to solve the above technical problems, the prior art discloses a rack type pneumatic actuator with the announcement number CN211715888U, which comprises a shell, left and right cylinder bodies and an impact body; the left and right cylinder bodies are shaped bodies and are symmetrically distributed with respect to the center of the body; the left and right cylinder bodies are respectively embedded in the left and right sides of the body through left and right end covers; left and right pistons are respectively arranged in the left and right cylinder bodies; a gear shaft penetrates the center of the body; the left and right cylinder bodies have a piston guide area and a rack guide area, and the two rack guide areas constitute a rotary cavity with the upper part of the body at the open part of the position of the limit block.

[0004] Although the above-mentioned prior art scheme, but the rack is directly arranged on the piston, and the rack is in an integrated structure with the piston, when the gear is worn and aged to cause meshing rotation to be not smooth, the rack can be taken out from the shell alone, but the rack in an integrated structure with the piston is difficult to replace alone, and if the rack is separated and replaced, the labor of workers is increased, and if the piston is replaced together with the rack, the cost is increased. UTILITY MODEL CONTENTS

[0005] The utility model discloses a gear and rack pneumatic actuator to solve the rack of the gear and rack pneumatic actuator is directly arranged on the piston, and the piston is an integral structure, when the gear is worn and aged to cause meshing rotation to be not smooth, can be taken out from the shell alone, and the rack that is integrated with the piston is difficult to replace alone, if separates and replaces, then the labor of staff is increased, but if replaces together with the piston, then the cost problem is increased.

[0006] To realize above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A gear and rack pneumatic actuator, including actuator main part, the both ends of actuator main part are all set up with the placing groove, the inboard sliding joint of placing groove has piston main body, the inside central place of actuator main part is connected with gear column, the opposite face of two groups piston main body is all connected with rack through quick -mounting mechanism, the tooth shape of rack and gear column is all involute tooth shape, quick -mounting mechanism includes locking assembly, rubber pad, unlocking assembly and closure assembly, locking assembly is used to lock the position of rack, unlocking assembly is used to cancel the locking to rack, closure assembly is used to close up the operating part of unlocking assembly.

[0008] As the preferred scheme of the utility model, the locking assembly includes the lap joint seat installed on one side of the outer wall of the piston main body, the rubber pad is embedded and installed on one side of the lap joint seat, one end of the inner rubber pad is provided with a butt joint hole, one end of the rack is provided with a clamping block, a clamping groove is formed on the outer wall of the lap joint seat corresponding to the butt joint hole, the clamping block and the butt joint hole and the clamping groove are all in sliding connection, a locking groove is formed on one side of the clamping groove in the lap joint seat, a rotating rod is rotatably connected to the inner side of the locking groove, and a locking block is sleeved on the outer side of the rotating rod.

[0009] As the preferred scheme of the utility model, a connecting groove is formed on one side of the locking block, a fixed plate is installed on one side of the inner wall of the locking groove, a locking spring is installed between the inner wall of the connecting groove and the fixed plate, a first guide surface is formed on the abutting surface of the clamping block and the locking block, a retraction groove is formed in the locking block at the first guide surface, an abutting rod is rotatably connected to the inner side of the retraction groove, an abutting plate is sleeved on the outer side of the abutting rod, a return torsional spring is installed between the abutting rod and the inner wall of the retraction groove, an abutting groove is formed in the first guide surface of the clamping block, and a second guide surface is formed on one side of the abutting plate corresponding to the abutting surface of the first guide surface.

[0010] As the preferred scheme of the utility model, the unlocking assembly includes the limiting slot which is arranged on the inner wall of the locking groove, the limiting plate which is slidably connected with the limiting slot is arranged on the end of the locking block away from the first guide surface, the extending groove is arranged on the side of the lap joint seat inside the locking groove, and the torsion ring is arranged on the end of the rotating rod extending to the inner side of the extending groove.

[0011] As the preferred scheme of the utility model, the closing assembly includes the sliding groove which is arranged on the outer wall of the lap joint seat, the inner side of the sliding groove is communicated with the inner side of the extending groove, the sliding plate is slidably connected with the inner side of the sliding groove, the first fixing member is embedded on one end of the sliding plate, the second fixing member corresponding to the first fixing member is embedded on one side of the inner wall of the sliding groove, the synchronous grooves are arranged on both sides of the inner wall of the sliding groove, and the synchronous blocks slidably connected with the synchronous grooves are arranged on both sides of the sliding plate.

[0012] As the preferred scheme of the utility model, the length of the sliding plate is smaller than the length of the sliding groove, the length of the sliding groove is greater than the length of the extending groove, and the pull slot is arranged on one side of the sliding plate.

[0013] As the preferred scheme of the utility model, the first fixing member and the second fixing member are both magnetic members, one of the first fixing member and the second fixing member is the first magnetic member, the other of the first fixing member and the second fixing member is the second magnetic member, the first magnetic member and the second magnetic member are opposite in magnetism and attract each other.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] In the utility model, the position of the rack is locked by the locking assembly, the rack is unlocked by the unlocking assembly, and the operation part of the unlocking assembly is closed by the closing assembly, so that the rack which is aged and worn is quickly separated by the staff, the labor of the staff is reduced, and the work efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the overall structure schematic view of the utility model;

[0017] Figure 2 It is the three-dimensional structure schematic view of the piston main body, the rack and the gear column of the utility model;

[0018] Figure 3 It is the local three-dimensional structure schematic view of the lap joint seat of the utility model;

[0019] Figure 4 It is the local sectional structure schematic view of the lap joint seat of the utility model.

[0020] In the figure: 1, actuator body; 2, piston body; 3, gear column; 4, rack; 5, clamping block; 6, rotating rod; 7, locking block; 8, fixed plate; 9, locking spring; 10, first guide surface; 11, abutting plate; 12, reset torsional spring; 13, second guide surface; 14, limiting plate; 15, torsional ring; 16, rubber pad; 17, lapping seat; 18, synchronous groove; 19, sliding plate; 20, first fixing member. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Embodiment:

[0023] Please refer to Figures 1-4 The present application provides a technical solution:

[0024] A gear and rack pneumatic actuator, comprising an actuator body 1, both ends of the actuator body 1 are provided with a placing groove, a piston body 2 is slidably connected to the inner side of the placing groove, a gear column 3 is rotatably connected to the central part of the inside of the actuator body 1, two groups of piston bodies 2 are provided with a rack 4 through a quick mounting mechanism on the opposite surfaces, the tooth shape of the rack 4 and the gear column 3 is involute tooth shape, the quick mounting mechanism comprises a locking assembly, a rubber pad 16, an unlocking assembly and a closing assembly, the locking assembly is used for locking the position of the rack 4, the unlocking assembly is used for unlocking the locking of the rack 4, and the closing assembly is used for closing the operating part of the unlocking assembly. When the device is used, the position of the rack 4 can be locked by the locking assembly, the unlocking assembly unlocks the locking of the rack 4, and the closing assembly closes the operating part of the unlocking assembly. The device is simple in structure, convenient to operate, facilitates workers to quickly separate the aged and worn racks 4, reduces the labor amount of workers, and improves the work efficiency.

[0025] In the present embodiment, as Figure 1 , Figure 2 and Figure 3As shown, the locking assembly comprises a lap seat 17 mounted on one side of the outer wall of the piston body 2, the rubber pad 16 is embedded and mounted on one side of the lap seat 17, the inside of the rubber pad 16 is provided with a butt joint hole, one end of the rack 4 is provided with a clamping block 5, the outer wall of the lap seat 17 is provided with a clamping groove corresponding to the butt joint hole, the clamping block 5 is in sliding connection with the butt joint hole and the clamping groove, the inside of the lap seat 17 is provided with a locking groove on one side of the clamping groove, the locking groove is rotatably connected with a rotating rod 6 on the inside, the outside of the rotating rod 6 is sleeved with a locking block 7, first, the gear column 3 and the rack 4 are both involute tooth shape, which has the characteristics of wide application range, good transmission efficiency and high meshing precision, when assembling the rack 4, the rack 4 is attached to the rubber pad 16 on the lap seat 17, so that the clamping block 5 is pushed into the inside of the clamping groove.

[0026] In this embodiment, as shown in Figure 2 、 Figure 3 and Figure 4 , one side of the locking block 7 is provided with a connecting groove, one side of the inner wall of the locking groove is provided with a fixed plate 8, the connecting groove is provided with a locking spring 9 between the inner wall and the fixed plate 8, the attached surface of the clamping block 5 and the locking block 7 is provided with a first guide surface 10, the inside of the locking block 7 is provided with a retraction groove at the first guide surface 10, the inside of the retraction groove is rotatably connected with an abutting rod, the outside of the abutting rod is sleeved with an abutting plate 11, the abutting rod and the inner wall of the retraction groove are provided with a return torsion spring 12, the inside of the clamping block 5 is provided with an abutting groove at the first guide surface 10, one side of the abutting plate 11 is provided with a second guide surface 13 corresponding to the first guide surface 10, then, the rubber pad 16 is continuously extruded, and the clamping block 5 will enter the inside of the locking groove and contact the locking block 7 as the rubber pad 16 retracts, the first guide surfaces 10 of the two are extruded, forcing the locking block 7 to rotate around the rotating rod 6, and the locking spring 9 is stretched at the same time, after the clamping block 5 contacts the abutting plate 11, the first guide surface 10 and the second guide surface 13 are extruded, forcing the abutting rod to drive the return torsion spring 12 to retract, allowing the abutting plate 11 to completely retract to the inside of the retraction groove, until the abutting groove is close to the retraction groove, the abutting plate 11 is popped out to the inside of the abutting groove by the return torsion spring 12, at this time, the rubber pad 16 of the rack 4 is released, the clamping block 5 is driven to move back by the resilience of the rubber pad 16, the abutting plate 11 is tightly fixed with the inner wall of the abutting groove, and the position of the rack 4 is locked.

[0027] In this embodiment, as shown in Figure 2 、 Figure 3 and Figure 4As shown, the unlocking assembly includes a limiting groove opened on one side of the inner wall of the locking groove, and the end of the locking block 7 away from the first guide surface 10 is provided with a limiting plate 14 in sliding connection with the limiting groove. The inside of the lap seat 17 located on one side of the locking groove is provided with an extension groove, and the end of the rotating rod 6 extending to the inside of the extension groove is provided with a torsion ring 15. Further, when the rack 4 needs to be maintained or replaced due to severe aging and wear, the torsion ring 15 can be twisted to drive the rotating rod 6 to rotate, thereby driving the locking block 7 to rotate, and the abutment plate 11 is dragged away from the inner wall of the abutment groove. At this time, the rubber pad 16 is completely reset to allow the clamping block 5 to continue to move. After the abutment groove is misaligned with the retraction groove, the abutment plate 11 will not be clamped into the inside of the abutment groove, and the rack 4 together with the clamping block 5 can be removed for maintenance or replacement.

[0028] In this embodiment, as shown in Figure 2 、 Figure 3 and Figure 4 , the closing assembly includes a sliding groove opened on the outer wall of the lap seat 17, the inside of the sliding groove is in communication with the inside of the extension groove, the sliding groove is in sliding connection with a sliding plate 19, one end of the sliding plate 19 is embedded with a first fixing member 20, one side of the inner wall of the sliding groove is embedded with a second fixing member corresponding to the first fixing member 20, both sides of the inner wall of the sliding groove are provided with synchronous grooves 18, both sides of the sliding plate 19 are provided with synchronous blocks in sliding connection with the synchronous grooves 18, the length of the sliding plate 19 is smaller than the length of the sliding groove, the length of the sliding groove is greater than the length of the extension groove, one side of the sliding plate 19 is provided with a buckle slot, the first fixing member 20 and the second fixing member are both magnetic members, one of the first fixing member 20 and the second fixing member is a first magnetic member, the other of the first fixing member 20 and the second fixing member is a second magnetic member, the magnetic properties of the first magnetic member and the second magnetic member are opposite and attract each other. Further, after the rack 4 is spliced, the staff can buckle the buckle slot on the sliding plate 19 to drive the sliding plate 19 to slide inside the sliding groove, so that the synchronous blocks can slide inside the synchronous grooves 18, the position of the sliding plate 19 is limited to make its movement more stable, the first fixing member 20 on the sliding plate 19 is close to and attached to the inner wall of the sliding groove, so that the first fixing member 20 can be adsorbed with the second fixing member to position the sliding plate 19, so that the sliding plate 19 can close the torsion ring 15 inside the extension groove, which can effectively prevent the connection between the rack 4 and the lap seat 17 from loosening due to accidental touch of the torsion ring 15 by personnel after assembly.

[0029] The implementation principle of the gear and rack pneumatic actuator provided by the embodiment of the application is as follows: the gear column 3 and the rack 4 are both provided with involute tooth profile, and have the characteristics of wide application range, good transmission efficiency and high meshing precision; when the rack 4 is assembled, the rubber pad 16 on the lapping seat 17 is attached to the rack 4, the clamping block 5 is pushed into the clamping groove from the abutting hole, the rubber pad 16 is continuously extruded, the clamping block 5 enters the locking groove and contacts the locking block 7, the first guide surface 10 of the two is extruded, the locking block 7 is forced to rotate around the rotating rod 6, the locking spring 9 is stretched at the same time, after the clamping block 5 contacts the abutting plate 11, the first guide surface 10 and the second guide surface 13 are attached and extruded, the abutting rod drives the return torsion spring 12 to retract, the abutting plate 11 is completely retracted to the inside of the retraction groove, until the abutting groove is close to the retraction groove, the abutting plate 11 is popped to the inside of the abutting groove by the return torsion spring 12, at this time, the rubber pad 16 rebounds to drive the clamping block 5 to move back, the abutting plate 11 is fixed by abutting against the inner wall of the abutting groove, and the position of the rack 4 is locked; when the rack 4 that is seriously aged and worn needs to be maintained or replaced, the torsion ring 15 can be twisted to drive the rotating rod 6 to rotate, the locking block 7 is driven to rotate, the abutting plate 11 is dragged away from the inner wall of the abutting groove, at this time, the rubber pad 16 is completely reset to rebound to make the clamping block 5 continue to move, after the abutting groove is misaligned with the retraction groove, the abutting plate 11 will not be clamped into the inside of the abutting groove again when the torsion ring 15 is loosened, and the rack 4 and the clamping block 5 are taken down for maintenance or replacement; after the rack 4 is spliced, the worker can hold the pull slot on the sliding plate 19 to drive the sliding plate 19 to slide in the sliding groove, so that the synchronous block can slide in the synchronous groove 18, the position of the sliding plate 19 is limited to make the movement more stable, the first fixing part 20 on the sliding plate 19 is close to and attached to the inner wall of the sliding groove, the first fixing part 20 can be adsorbed with the second fixing part to position the sliding plate 19, so that the sliding plate 19 can enclose the torsion ring 15 in the extension groove, and the connection between the rack 4 and the lapping seat 17 can be effectively prevented from loosening due to the accidental touch of the torsion ring 15 by the worker after assembly.

[0030] Although the embodiments of the application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A rack and pinion pneumatic actuator comprising an actuator body (1), characterized in that: Both ends of the executor body (1) are provided with placing grooves, the inside of the placing grooves is slidably connected with a piston body (2), the inside of the executor body (1) is rotatably connected with a gear column (3), the opposite faces of the two groups of piston bodies (2) are all clamped with a rack (4) through a quick mounting mechanism, the teeth of the rack (4) and the gear column (3) are both involute tooth shapes, the quick mounting mechanism comprises a locking assembly, a rubber pad (16), an unlocking assembly and a closing assembly, the locking assembly is used for locking the position of the rack (4), the unlocking assembly is used for unlocking the rack (4), and the closing assembly is used for closing the operating part of the unlocking assembly.

2. A rack and pinion pneumatic actuator according to claim 1, characterized in that: The locking assembly comprises a lap joint seat (17) mounted on one side of the outer wall of the piston body (2), the rubber pad (16) is embeddedly mounted on one side of the lap joint seat (17), one end of the inside of the rubber pad (16) is provided with a butt joint hole, one end of the rack (4) is provided with a clamping block (5), the outer wall of the lap joint seat (17) is provided with a clamping groove corresponding to the butt joint hole, the clamping block (5) is slidably connected with the butt joint hole and the clamping groove, the inside of the lap joint seat (17) is provided with a locking groove on one side of the clamping groove, and the inside of the locking groove is rotatably connected with a rotating rod (6).

3. A rack and pinion pneumatic actuator according to claim 2, characterized in that: One side of the locking block (7) is provided with a connecting groove, one side of the inner wall of the locking groove is provided with a fixed plate (8), and the connecting groove is provided between the inner wall of the locking groove and the fixed plate (8). The locking spring (9) is mounted, the abutting faces of the clamping block (5) and the locking block (7) are all provided with first guide faces (10) abutting with each other, the inside of the locking block (7) is provided with a retraction groove at the first guide face (10) thereof, the inside of the retraction groove is rotatably connected with an abutting rod, the outside of the abutting rod is sleeved with an abutting plate (11), the abutting rod and the inner wall of the retraction groove are provided with a return torsional spring (12), and the inside of the clamping block (5) is provided with an abutting groove at the first guide face (10) thereof. One side of the abutting plate (11) is provided with a second guide face (13) abutting with the first guide face (10) correspondingly.

4. A rack and pinion pneumatic actuator according to claim 3, characterized in that: The unlocking assembly comprises a limiting groove provided on one side of the inner wall of the locking groove, one end of the locking block (7) away from the first guide face (10) is provided with a limiting plate (14) slidably connected with the limiting groove, and the inside of the lap joint seat (17) is provided with an extension groove on one side of the locking groove. One end of the rotating rod (6) extending to the inside of the extension groove is provided with a torsional ring (15).

5. A rack and pinion pneumatic actuator according to claim 4, characterized in that: The closing assembly comprises a sliding groove provided on the outer wall of the lap joint seat (17), the inside of the sliding groove is communicated with the inside of the extension groove, the inside of the sliding groove is slidably connected with a sliding plate (19), one end of the sliding plate (19) is embeddedly provided with a first fixing piece (20), one side of the inner wall of the sliding groove is embeddedly provided with a second fixing piece corresponding to the first fixing piece (20), both sides of the inner wall of the sliding groove are provided with synchronous grooves (18), and both sides of the sliding plate (19) are provided with synchronous blocks slidably connected with the synchronous grooves (18).

6. A rack and pinion pneumatic actuator according to claim 5, characterized in that: The length size of the sliding plate (19) is smaller than that of the sliding groove, the length size of the sliding groove is larger than that of the extending groove, and one side of the sliding plate (19) is provided with a buckle slot.

7. A rack and pinion pneumatic actuator according to claim 6, characterized in that: The first fixing member (20) and the second fixing member are both magnetic members, one of the first fixing member (20) and the second fixing member is a first magnetic member, the other of the first fixing member (20) and the second fixing member is a second magnetic member, and the first magnetic member and the second magnetic member are opposite in magnetism and attract each other.

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