Precise pneumatic actuator with adjustable stroke

Abstract

The utility model provides a precise pneumatic actuator with adjustable stroke, which relates to the technical field of pneumatic actuators and comprises a sleeve, a connecting sleeve slidably connected to the inner side of the sleeve, a first lifting sleeve fixedly connected to the top end of the connecting sleeve, a second lifting sleeve slidably connected to the inner side of the connecting sleeve, and a connecting rod fixedly connected to the top end of the second lifting sleeve. The bottom end of the second lifting sleeve is fixedly connected with two first connecting plates, the bottom end of the connecting sleeve is fixedly connected with two second linkage plates, and the inner sides of the two second linkage plates are fixedly connected with supporting rods. In the utility model, in the starting stage, the first lifting sleeve driven by the air inlet drives the connecting sleeve to move, and the second lifting sleeve obtains double stroke output through the synchronous wheel set and the synchronous belt system with the transmission ratio of 2: 1, so as to push the connecting rod to complete amplified linear motion.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic actuator technical field especially relates to a precision pneumatic actuator of adjustable stroke. BACKGROUND

[0002] Pneumatic actuator is driven by gas pressure to open or close or adjust the valve execution device, also known as pneumatic actuator or pneumatic device, but generally colloquial is called pneumatic head. Pneumatic actuator sometimes also equipped with certain auxiliary device. Commonly used have valve positioner and hand wheel mechanism. Pneumatic device is mainly composed of cylinder, piston, gear shaft, end cover, sealing element, screw etc.

[0003] In prior art, when the general cylinder controls the piston movement, stroke control usually relies on mechanical limit or external sensor, but the precision can be insufficient, and it is troublesome to adjust, cannot accurately control the distance of each stroke, and the traditional cylinder will be slow in response due to the compressibility of gas, so that more compressed gas needs to be input when outputting longer stroke. UTILITY MODEL CONTENT

[0004] The utility model mainly provides a precision pneumatic actuator of adjustable stroke of convenient improvement stroke output efficiency, adjustable stroke distance.

[0005] In order to realize the above object, the utility model adopts the following technical scheme:

[0006] A precision pneumatic actuator of adjustable stroke, including sleeve, the sleeve inside slide connection connecting sleeve, the connecting sleeve top fixed connection first lifting sleeve, the connecting sleeve inside slide connection second lifting sleeve, the second lifting sleeve top fixed connection connecting rod, the second lifting sleeve bottom fixed connection two first connecting plates, the connecting sleeve bottom fixed connection two second connecting plates, two The second connecting plate inside fixed connection support rod, two The second connecting plate between rotatable connection two synchronous wheels, two The synchronous wheel outer surface sleeve connection synchronous belt, two The first connecting plate bottom fixed connection fixed frame, the fixed frame one end fixed connection first pin, the first pin with synchronous belt fixed connection, the synchronous belt is located in the first pin inside, the sleeve both sides are evenly provided with limiting mechanism, the first lifting sleeve side wall rotatable connection movable lock.

[0007] Preferably, the limiting mechanism includes a fixed plate, one end of the fixed plate is fixedly connected with the outer surface of the sleeve. It is convenient to limit.

[0008] Preferably, the fixed plate top fixed connection slide rod, first lifting sleeve bottom both sides fixed connection limit sleeve. The limit sleeve will slide on the surface of the slide rod.

[0009] Preferably, the limiting sleeve is sleeved on the outer surface of the sliding rod, and the limiting sleeve is in sliding connection with the sliding rod. The stroke guiding effect can be achieved.

[0010] Preferably, the outer surface of the top end of the sliding rod is in threaded connection with the limiting threaded sleeve. The stroke can be adjusted and limited.

[0011] Preferably, the bottom of the sleeve is fixedly connected with the air inlet. The starting effect is facilitated.

[0012] Preferably, the outer surface of the synchronous belt is in sliding connection with the second pin, and one end of the second pin is fixedly connected with the inner wall of the sleeve. The position of the synchronous belt can be limited.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are that,

[0014] 1. In the starting stage, the air inlet drives the first lifting sleeve to drive the connecting sleeve to displace, the synchronous wheel group with a 2:1 transmission ratio and the synchronous belt system enable the second lifting sleeve to obtain double stroke output, and the connecting rod is pushed to complete the amplification type linear motion.

[0015] 2. In the utility model, the movement range of the limiting sleeve is restricted, and the stability of the execution stroke under different air pressure conditions is ensured. The two systems work cooperatively, realize the efficient conversion and motion amplification of pneumatic energy, guarantee the positioning accuracy of the end effector, and form the double advantages of power output and accurate control. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of the precision pneumatic actuator with adjustable stroke provided by the utility model;

[0017] Figure 2 It is a split structure schematic view of the precision pneumatic actuator with adjustable stroke provided by the utility model;

[0018] Figure 3 It is a partial structure schematic view of the precision pneumatic actuator with adjustable stroke provided by the utility model;

[0019] Figure 4 It is a second lifting sleeve internal structure schematic view of the precision pneumatic actuator with adjustable stroke provided by the utility model.

[0020] Legend: 1, sleeve; 11, air inlet; 21, fixed plate; 22, limiting sleeve; 23, sliding rod; 24, limiting threaded sleeve; 2, limiting mechanism; 3, first lifting sleeve; 4, connecting rod; 5, second lifting sleeve; 51, first connecting plate; 6, fixed frame; 61, first pin; 7, synchronous wheel; 71, synchronous belt; 72, second pin; 8, connecting sleeve; 81, second linkage plate; 82, supporting rod; 9, movable lock. DETAILED DESCRIPTION

[0021] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be further described below with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific details set forth herein, and, accordingly, the present application is not limited to the specific embodiments disclosed below.

[0023] Please refer to Figure 1 - Figure 4 The present application provides a technical solution: a precise pneumatic actuator with adjustable stroke, comprising a sleeve 1, a connecting sleeve 8 is slidably connected to the inner side of the sleeve 1, a first lifting sleeve 3 is fixedly connected to the top end of the connecting sleeve 8, a second lifting sleeve 5 is slidably connected to the inner side of the connecting sleeve 8, a connecting rod 4 is fixedly connected to the top end of the second lifting sleeve 5, two first connecting plates 51 are fixedly connected to the bottom end of the second lifting sleeve 5, two second linkage plates 81 are fixedly connected to the bottom end of the connecting sleeve 8, a support rod 82 is fixedly connected to the inner side of the two second linkage plates 81, two synchronous pulleys 7 are rotatably connected between the two second linkage plates 81, a synchronous belt 71 is sleeved on the outer surface of the two synchronous pulleys 7, a fixed frame 6 is fixedly connected to the bottom end of the two first connecting plates 51, a first pin 61 is fixedly connected to one end of the fixed frame 6, the first pin 61 is fixedly connected with the synchronous belt 71, and the synchronous belt 71 is located on the inner side of the first pin 61, a limiting mechanism 2 is arranged on both sides of the sleeve 1, and the first lifting sleeve 3 is rotatably connected with a movable lock 9.

[0024] When starting, the working liquid injected through the air inlet 11 will form a hydraulic thrust, first driving the first lifting sleeve 3 to slide along the sleeve 1 in the axial direction, and the connecting sleeve 8 fixedly connected thereto will produce synchronous displacement hydraulic system pressure conduction path. In this process, the second linkage plate 81 fixedly connected to the bottom of the connecting sleeve 8 forms a rigid frame structure through the support rod 82, driving the synchronous pulley 7 installed on the inner side to produce rotary motion.

[0025] When the synchronous pulley 7 starts well, the sleeved synchronous belt 71 will produce transmission, forming a traction fulcrum through the first pin 61 fixedly connected to the end of the fixed frame 6. The belt drive and the rigid connection are combined in a composite transmission mode. This linkage mechanism makes the fixed frame 6 move with the synchronous belt 71, and then synchronously moves the second lifting sleeve 5 through the first connecting plate 51. At this time, the second lifting sleeve 5 is constrained by the connecting sleeve 8, driving the top connecting rod 4 to realize precise linear delivery.

[0026] Due to the synchronous wheel 7 group and the synchronous belt 71 constitute 2:1 transmission ratio design, the axial displacement amount of the connecting sleeve 8 is enlarged after the transmission system, the second lifting sleeve 5 obtains twice the input stroke of the moving distance mechanical gain principle. This movement amplification mechanism effectively improves the working range of the connecting rod 4 end execution mechanism, and through the coupling of hydraulic drive and mechanical transmission, the mechatronics design ensures that the whole pushing process has controllable acceleration curve and terminal position holding capacity.

[0027] As shown in Figure 2 , the limiting mechanism 2 includes a fixed plate 21, one end of the fixed plate 21 is fixedly connected with the outer surface of the sleeve 1. It is convenient to limit.

[0028] As shown in Figure 2 , the fixed plate 21 is fixedly connected with the top of the slide rod 23, and the bottom of the first lifting sleeve 3 is fixedly connected with the limiting sleeve 22 on both sides. The limiting sleeve 22 will slide on the surface of the slide rod 23.

[0029] As shown in Figure 2 , the limiting sleeve 22 is sleeved on the outer surface of the slide rod 23, and the limiting sleeve 22 is slidably connected with the slide rod 23. It can play the role of stroke guiding.

[0030] As shown in Figure 2 , the outer surface of the top end of the slide rod 23 is threadedly connected with the limiting threaded sleeve 24. The stroke can be adjusted and limited.

[0031] As shown in Figure 2 , the bottom of the sleeve 1 is fixedly connected with the air inlet 11. It is convenient to start.

[0032] As shown in Figure 4 , the outer surface of the synchronous belt 71 is slidably connected with the second pin 72, and one end of the second pin 72 is fixedly connected with the inner wall of the sleeve 1. The position of the synchronous belt 71 can be limited.

[0033] The use method and working principle of the device: when the pneumatic actuator is carried out, the liquid can be in and out by using the air inlet 11 when starting. In this process, first, the first lifting sleeve 3 and the connecting sleeve 8 start to act. At the same time, the synchronous wheel 7 on the inner side of the second linkage plate 81 of the connecting sleeve 8 will also start to operate. Because the synchronous wheel 7 starts to rotate, the transmission state of the synchronous belt 71 will change, thereby changing the position of the fixed frame 6, which will indirectly drive the first connecting plate 51 on the second lifting sleeve 5 to move, thereby controlling the second lifting sleeve 5 to start lifting, and then the connecting rod 4 will also start. In this process, the moving distance of the connecting sleeve 8 is twice that of the second lifting sleeve 5, so that the pushing process can be completed when starting.

[0034] In the control stroke aspect, through the activity of the limiting threaded sleeve 24 on the surface of the slide rod 23, the limiting threaded sleeve 24 will determine a limiting position. When the first lifting sleeve 3 is active, it will drive the limiting sleeve 22 to move, and the movement space of the limiting sleeve 22 will be limited by the limiting threaded sleeve 24. Therefore, each time it is started, no matter how much the liquid inlet amount is, the stroke that the device can reach can be controlled, and the specific stroke is determined by the position of the limiting threaded sleeve 24, so that the stroke can be adjusted according to the actual needs.

[0035] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technology content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution content of the present application, according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. An adjustable stroke precision pneumatic actuator comprising a sleeve (1), a connecting sleeve (8) is connected to the inside of the sleeve (1) in sliding connection, characterized in that: The connecting sleeve (8) top end fixed connection first lifting sleeve (3), the connecting sleeve (8) inside slide connection second lifting sleeve (5), the second lifting sleeve (5) top end fixed connection connecting rod (4), the second lifting sleeve (5) bottom fixed connection two first connecting plate (51), the connecting sleeve (8) bottom fixed connection two second linkage plate (81), two second linkage plate (81) inside fixed connection support rod (82), two second linkage plate (81) between rotationally connected two synchronous wheel (7), two synchronous wheel (7) outer surface sleeve synchronous belt (71), two first connecting plate (51) bottom fixed connection fixed frame (6), the fixed frame (6) one end fixed connection first pin (61), the first pin (61) and synchronous belt (71) fixed connection, the synchronous belt (71) is located in the first pin (61) inside, the sleeve (1) both sides are provided with limiting mechanism (2), the first lifting sleeve (3) side wall rotationally connected movable lock (9).

2. The adjustable stroke precision pneumatic actuator of claim 1, wherein: The limiting mechanism (2) comprises a fixed plate (21), one end of the fixed plate (21) is fixedly connected with the outer surface of the sleeve (1).

3. The adjustable stroke precision pneumatic actuator of claim 2, wherein: The fixed plate (21) top fixed connection slide rod (23), the first lifting sleeve (3) bottom both sides are fixedly connected with limiting sleeve (22).

4. The adjustable stroke precision pneumatic actuator of claim 3, wherein: The limiting sleeve (22) is sleeved on the outer surface of the slide rod (23), and the limiting sleeve (22) is slidably connected with the slide rod (23).

5. The adjustable stroke precision pneumatic actuator of claim 4, wherein: The outer surface of the slide rod (23) top end is threadedly connected with the limiting threaded sleeve (24).

6. The adjustable stroke precision pneumatic actuator of claim 1, wherein: The bottom of the sleeve (1) is fixedly connected with the air inlet (11).

7. The adjustable stroke precision pneumatic actuator of claim 1, wherein: The outer surface of the synchronous belt (71) is slidably connected with the second pin (72), one end of the second pin (72) is fixedly connected with the inner wall of the sleeve (1).

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