Linkage mechanism for pneumatic actuator

Abstract

The utility model discloses a linkage mechanism, belongs to the technical field of pneumatic actuators, and particularly relates to a linkage mechanism for a pneumatic actuator. The linkage assembly is fixedly mounted on the fixing plate; the pneumatic actuator is mounted on the fixing plate and connected with the linkage assembly to drive the linkage assembly to rotate; the main valve and the auxiliary valve are installed at the two ends of the bottom of the fixing plate and connected with the linkage assembly so as to rotate along with the pneumatic actuator through the linkage assembly. A gear and rack transmission mode is adopted, and the transmission mechanism has the advantages of being stable in transmission, accurate in transmission ratio, reliable in work, compact in structure, high in efficiency, long in service life and large in used power, speed and size adjusting range. And the valve can be well adapted to various environments.

Description

Technical Field

[0001] The utility model discloses a linkage mechanism, belongs to the technical field of pneumatic actuators, and specifically relates to a linkage mechanism for pneumatic actuators. Background Art

[0002] Pneumatic actuator is a key device widely used in the field of industrial automation, with the characteristics of fast, reliable and high energy. It plays a vital role in the control system, converting air pressure into linear or rotary motion and transmitting it to the actuator.

[0003] One of the similar structures now includes a positioning and limiting linkage mechanism for pneumatic actuators, and its structure is that the feedback rod of the positioner and the feedback rod of the limit switch and the long connecting rod are installed on the linkage bracket above the actuator; its operation mode is that the feedback rod of the connected switch or positioner is driven by the actuator, and the force is transmitted through the long connecting rod to drive the synchronous rotation between the two. The second similar structure is that the pneumatic actuator is connected to the connecting shaft at the bottom of the actuator through the bottom, and a C-type fork is sleeved on the outer wall of the connecting shaft (the matching relationship is a key matching); then the connecting rod and the C-type fork are connected by a pin, and the other end is connected to the valve in the same way. The torque generated by the pneumatic actuator drives the fork to transmit the force through the connecting rod to the valve at the other end of the actuator and realize synchronous action with the valve directly connected to the lower end of the actuator. One of these two structures is to realize the synchronization between the positioner and the limit switch, and the other is the synchronous work between valves;

[0004] Disadvantages of the existing technology: poor structural stability, most structures use connecting rods to drive the transmission shafts at both ends to achieve synchronization; there is no stabilizing device on the connecting rod to protect the connecting rod, and the valve that responds to high-frequency vibrations can easily damage the connecting rod that operates for a long time, and its life span will be greatly reduced. Utility Model Content

[0005] The purpose of the utility model is to provide a linkage mechanism for a pneumatic actuator to solve the above-mentioned problem that two actuators cannot be inserted to actuate valves that are relatively close to each other when space is limited.

[0006] Technical solution: A linkage mechanism for a pneumatic actuator, the linkage mechanism comprising: a fixed plate; a linkage component fixedly mounted on the fixed plate; a pneumatic actuator mounted on the fixed plate and connected to the linkage component to drive the linkage component to rotate; a main valve and a secondary valve mounted at both ends of the bottom of the fixed plate and connected to the linkage component to rotate with the pneumatic actuator through the linkage component.

[0007] In a further embodiment, the pneumatic actuator is fixedly mounted on the fixing plate via an actuator bracket.

[0008] In a further embodiment, the linkage assembly includes: a central axis, which is mounted on the fixed plate through a socket; a main rack rod and a secondary rack rod, which are respectively fixedly sleeved on the two ends of the central axis, and the main rack rod and the secondary rack rod are both provided with mounting grooves; a main rack and a secondary rack, which are respectively mounted on the mounting grooves on the main rack rod and the secondary rack rod, and are respectively fixedly connected to the main rack rod and the secondary rack rod through a main rack pressure plate and a secondary rack pressure plate; a main connecting shaft, one end of which passes through the actuator bracket and is connected to the fixed plate through a ball bearing, and the other end is connected to the pneumatic actuator through a coupling to rotate with the pneumatic actuator; a main gear, which is sleeved on the main connecting shaft and meshed with the main rack; a secondary connecting shaft, which is connected to the fixed plate through a ball bearing; a secondary gear, which is sleeved on the main connecting shaft and meshed with the main rack.

[0009] In a further embodiment, the main valve is fixedly connected to one end of the main connecting shaft through a coupling so as to rotate along with the main connecting shaft; the auxiliary valve is fixedly connected to one end of the auxiliary connecting shaft through a coupling so as to rotate along with the auxiliary connecting shaft.

[0010] In a further embodiment, two fixedly connected limit seats are provided on the fixed plate, and the limit seats cooperate with the main rack pull rod and the auxiliary rack pull rod respectively to limit the positions of the main rack pull rod and the auxiliary rack pull rod.

[0011] In a further embodiment, the central axis moves on the clamping seat and the limiting seat according to the rotation of the pneumatic actuator.

[0012] Beneficial effects: The utility model solves the problem of poor stability very well. In view of these shortcomings, the utility model improves the uniformity of parts in structure, and all parts will be isolated from the valves connected below by a connecting plate. The parts above the connecting plate can be installed in an integrated manner and then the whole can be installed at the user's site, which greatly improves the on-site installation efficiency. The most important thing is that the transmission part of the mechanism adopts a gear rack transmission method, which has the advantages of smooth transmission, precise transmission ratio, reliable operation, compact structure, high efficiency, long life, and a large power, speed and size adjustment range; it can cope with valves in various environments very well. In addition, for the case of limited space, two actuators cannot be inserted to actuate valves that are relatively close to each other. The connecting rod mechanism can solve this problem very well; in addition, the mechanism can also achieve the requirements of synchronous action on the customer's site and meet the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a general assembly diagram of a linkage mechanism for a pneumatic actuator proposed by the utility model.

[0014] Figure 2 The utility model is a top view of a linkage mechanism for a pneumatic actuator.

[0015] Figure numerals: pneumatic actuator 1, main connecting shaft 2, main gear 3, actuator bracket 4, main rack pressure plate 5, main rack 6, rack pull rod 7, main valve 8, auxiliary valve 9, limit seat 10, auxiliary rack pressure plate 11, clamping seat 12, auxiliary connecting shaft 13, auxiliary rack 14, auxiliary gear 15, auxiliary gear seat 16, fixing plate 17. DETAILED DESCRIPTION

[0016] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] A linkage mechanism for a pneumatic actuator comprises: a fixing plate 17 with two valves fixedly connected at the bottom, and a pneumatic actuator 1 fixed at one end above the fixing plate 17.

[0020] In one embodiment, Figure 1 to Figure 2As shown, the linkage mechanism includes: a fixed plate 17; a linkage component, fixedly mounted on the fixed plate 17; a pneumatic actuator 1, mounted on the fixed plate 17 and connected to the linkage component to drive the linkage component to rotate; a main valve 8 and a secondary valve 9, mounted at both ends of the bottom of the fixed plate 17, and connected to the linkage component to rotate with the pneumatic actuator 1 through the linkage component.

[0021] In one embodiment, Figure 1 to Figure 2 As shown, the pneumatic actuator 1 is fixedly mounted on the fixing plate 17 via an actuator bracket 4 .

[0022] In one embodiment, Figure 1 to Figure 2 As shown, a secondary gear seat 16 is provided at the bottom of the secondary gear 15 and the outside of the secondary connecting shaft 13 .

[0023] In one embodiment, Figure 1 to Figure 2 As shown, the linkage assembly includes: a central axis, which is installed on the fixed plate 17 through a clamping seat 12; a main rack pull rod 7 and a secondary rack pull rod 7, which are respectively fixedly sleeved on the two ends of the central axis, and the main rack pull rod 7 and the secondary rack pull rod 7 are both provided with mounting grooves; a main rack 6 and a secondary rack 14, which are respectively installed in the mounting grooves on the main rack pull rod 7 and the secondary rack pull rod 7, and are respectively connected to the main rack pull rod 7 and the secondary rack pull rod 7 through a main rack pressure plate 5 and a secondary rack pressure plate 11. The main connecting shaft 2 is fixedly connected with the fixing plate 17 through the actuator bracket 4 at one end and connected with the fixing plate 17 through a ball bearing, and the other end is connected with the pneumatic actuator 1 through a coupling to rotate with the pneumatic actuator 1; the main gear 3 is sleeved on the main connecting shaft 2 and meshed with the main rack 6; the auxiliary connecting shaft 13 is connected with the fixing plate 17 through a ball bearing; the auxiliary gear 15 is sleeved on the main connecting shaft 2 and meshed with the auxiliary rack 14.

[0024] In one embodiment, Figure 1 to Figure 2 As shown, the main valve 8 is fixedly connected to one end of the main connecting shaft 2 through a coupling so as to rotate along with the main connecting shaft 2; the auxiliary valve 9 is fixedly connected to one end of the auxiliary connecting shaft 13 through a coupling so as to rotate along with the auxiliary connecting shaft 13.

[0025] In one embodiment, Figure 1 to Figure 2 As shown, two fixedly connected limit seats 10 are provided on the fixed plate 17 , and the limit seats 10 cooperate with the main rack pull rod 7 and the auxiliary rack pull rod 7 respectively to limit the positions of the main rack pull rod 7 and the auxiliary rack pull rod 7 .

[0026] In one embodiment, Figure 1 to Figure 2As shown, the central axis moves on the clamping seat 12 and the limiting seat 10 according to the rotation of the pneumatic actuator 1 .

[0027] In one embodiment, Figure 1 to Figure 2 As shown, the proposed linkage mechanism for a pneumatic actuator 1 has a simple structure and is easy to install. The installation method is as follows: first, the fixing plate 17 is installed above the connecting platform of the main valve 8 and the auxiliary valve 9, and then the main rack pressure plate 5 and the main rack 6 and the rack pull rod 7 (auxiliary rack pressure plate 11 and auxiliary rack 14) are assembled together, wherein the auxiliary rack pressure plate 11 and the main rack pressure plate 5 respectively press the corresponding auxiliary rack 14 and the main rack 6, and adopt a bolt fixing method, with a threaded hole for the rack and a through hole for the rack; the fixing method of the central axis holder 12 is also bolt fixing, first, the assembled pull rod assembly is inserted into the central axis holder 12 and then the two are fixed from the bottom of the fixing plate 17 with bolts, then the limit seat 10 is installed to limit the entire pull rod mechanism, and finally the main connecting shaft 2 and the auxiliary connecting shaft 13 are installed to connect the valve stem for linkage transmission, and then the auxiliary gear seat 16 and the main gear 3 and the auxiliary gear 15 are installed; thereby forming the above-mentioned linkage mechanism for a pneumatic actuator 1.

[0028] Combination Figure 1 and Figure 2 The main operation mode is: the two ends of the tie rod assembly composed of: main rack pressure plate 5, main rack 6, rack pull rod 7, auxiliary rack pressure plate 11, and auxiliary rack 14 are respectively engaged with the auxiliary gear 15 and the main gear 3, and finally the power is transmitted from the pneumatic actuator 1 to the connecting rod assembly through the main connecting shaft 2, and at the same time drives the main valve 8 and the auxiliary valve 9 to operate simultaneously, so as to achieve the double valve linkage effect.

[0029] Working principle: When the utility model is working, first the main valve and the auxiliary valve are connected to the external equipment, and then the pneumatic actuator is connected to work. As the pneumatic actuator rotates, the main connecting shaft rotates accordingly, thereby driving the main gear and the main valve to rotate. As the main gear rotates, the main rack meshing with the main gear moves, and the main rack pull rod is driven to move through the main rack pressure plate, so that the central axis follows and moves on the base and the seat, thereby driving the auxiliary gear pull rod to move a certain distance, thereby driving the auxiliary rack to move through the auxiliary rack pressure plate, so that the auxiliary rack meshes with the auxiliary gear, the auxiliary gear rotates and drives the auxiliary connecting shaft to rotate, thereby rotating the auxiliary valve, so that the main valve and the auxiliary valve achieve a double-valve linkage effect; the utility model adopts gear meshing transmission, among which gears and racks have standard parts on the market, and the remaining components have a simple structure and are easy to process and produce; at the same time, the gear wear loss is low.

[0030] The most important thing is that the transmission part of the mechanism adopts the gear rack transmission method, which has the advantages of smooth transmission, precise transmission ratio, reliable operation, compact structure, high efficiency, long life, and a wide range of power, speed and size adjustment; it can cope with valves in various environments very well.

[0031] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A linkage mechanism for a pneumatic actuator, characterized in that: The linkage mechanism includes: a fixed plate; a linkage component fixedly mounted on the fixed plate; a pneumatic actuator mounted on the fixed plate and connected to the linkage component to drive the linkage component to rotate; a main valve and a secondary valve mounted at both ends of the bottom of the fixed plate and connected to the linkage component to rotate with the pneumatic actuator through the linkage component.

2. A linkage mechanism for a pneumatic actuator according to claim 1, characterized in that: The pneumatic actuator is fixedly mounted on the fixing plate via an actuator bracket.

3. A linkage mechanism for a pneumatic actuator according to claim 2, characterized in that: The linkage assembly includes: a central axis, which is installed on the fixed plate through a socket; a main rack pull rod and a secondary rack pull rod, which are fixedly sleeved on the two ends of the central axis respectively, and the main rack pull rod and the secondary rack pull rod are both provided with mounting grooves; a main rack and a secondary rack are respectively installed in the mounting grooves on the main rack pull rod and the secondary rack pull rod, and are respectively fixedly connected to the main rack pull rod and the secondary rack pull rod through a main rack pressure plate and a secondary rack pressure plate; a main connecting shaft, one end of which passes through the actuator bracket and is connected to the fixed plate through a ball bearing, and the other end is connected to the pneumatic actuator through a coupling to rotate with the pneumatic actuator; a main gear, which is sleeved on the main connecting shaft and meshed with the main rack; a secondary connecting shaft, which is connected to the fixed plate through a ball bearing; a secondary gear, which is sleeved on the main connecting shaft and meshed with the main rack.

4. A linkage mechanism for a pneumatic actuator according to claim 3, characterized in that: The main valve is fixedly connected to one end of the main connecting shaft through a coupling so as to rotate along with the main connecting shaft; the auxiliary valve is fixedly connected to one end of the auxiliary connecting shaft through a coupling so as to rotate along with the auxiliary connecting shaft.

5. The linkage mechanism for a pneumatic actuator according to claim 3, characterized in that: The fixing plate is provided with two fixedly connected limit seats, and the limit seats are respectively matched with the main rack pull rod and the auxiliary rack pull rod to limit the positions of the main rack pull rod and the auxiliary rack pull rod.

6. A linkage mechanism for a pneumatic actuator according to claim 5, characterized in that: The central axis moves on the clamping seat and the limiting seat according to the rotation of the pneumatic actuator.

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