Angular travel film type actuating mechanism

Abstract

The utility model provides an angular travel diaphragm type actuating mechanism which comprises a shell assembly, the left side and the right side of the upper portion of the shell assembly are connected with an upper diaphragm cover through hexagon head screws and hexagon nuts, a diaphragm is arranged on the lower portion of the upper diaphragm cover, and a diaphragm plate is installed on the lower portion of the diaphragm. The middle of the diaphragm plate is connected with the upper end face of the diaphragm rod assembly through a hexagon head screw. The design is compact, the appearance is small, the packaging size of the valve and the executing mechanism is small, the installation flexibility of the valve and the executing mechanism in a small rack and a large process pipeline is enhanced, and therefore precious time is saved; the idle stroke is reduced by tightening the connecting rod, the connecting rod is tightened to the spline valve shaft, the dead zone between the executing mechanism and the valve can be reduced through single-point connection, and the accumulated dead zone of the rotary control valve can be controlled within the range smaller than 0.5%.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to an angular stroke diaphragm actuator. Background Technology

[0002] Pneumatic diaphragm actuators are a common type of actuator in industrial automation control, mainly used to control the opening angle of valves or baffles. Their core principle is to use air pressure to push a diaphragm, generating thrust, which is then converted into rotational motion. Their structure mainly consists of a diaphragm chamber, a push rod, a spring assembly, and a feedback mechanism.

[0003] The diaphragm chamber acts as the power source for the entire system. It contains a flexible diaphragm made of rubber or metal. When a control signal is received, compressed air enters one side of the diaphragm chamber. At this point, the diaphragm deforms under air pressure, pushing the push rod to produce a linear displacement. This linear motion is not directly transmitted to the valve; instead, a specially designed gear set transforms the linear push-pull motion into a 90-degree rotational motion. This is the origin of the name "angular stroke."

[0004] Patent CN111520527A discloses a high-torque dual-diaphragm angular stroke actuator, comprising a positive-acting diaphragm actuator (A), a crank transmission housing, and a reaction-acting diaphragm actuator (B) arranged sequentially from left to right. The two actuators are each composed of a support frame, a diaphragm front end cover, a diaphragm rear end cover, a diaphragm, and a return spring assembly, all sequentially mounted under the fixation of fastening bolts. This invention proposes a pneumatic angular stroke diaphragm actuator with high motion accuracy, a simple and reliable structural design, and high output torque. It can be used with various angular stroke control valves, especially large-diameter angular stroke valves with high opening torque. This invention features ingenious design, simple structure, and low production cost. It can be well integrated with various angular stroke valves, and compared to traditional diaphragm angular stroke actuators, the output torque of this invention can be significantly increased while maintaining output accuracy under high torque conditions.

[0005] However, this patented technology also has the following problems: In the aforementioned document, the actuator transmits thrust to the shift crank 8 via the limiting slider 11, and the shift crank 13 rotates around its own center line to output torque. During pneumatic output, the force needs to be transmitted to the slider first, then overcome the slider's resistance to push it, and finally transmitted to the shift crank to make it rotate. During this transmission process, the thrust of the gas is significantly consumed, causing the shift crank to not reach the desired angle during rotation, thus affecting the valve opening and reducing the valve's control accuracy. Utility Model Content

[0006] In view of the above technical problems, this utility model provides an angular stroke diaphragm actuator to improve the adjustment accuracy.

[0007] The utility model provides a kind of angular travel diaphragm actuator, including shell assembly, it is characterized in that the upper part of the shell assembly is connected with upper membrane cover by hexagonal head screw and hexagonal nut left and right, the lower part of the upper membrane cover is provided with diaphragm, the lower part of the diaphragm is installed diaphragm plate, the middle part of the diaphragm plate is connected with the upper end surface of diaphragm rod assembly by hexagonal head screw, the outer side of the lower part of the diaphragm rod assembly is connected with guide assembly, the outer side of the guide assembly is sleeved and is provided with inner spring, the outer side of the inner spring is provided with outer spring, the bottom end of the diaphragm rod assembly is rotatably connected with connecting rod, the connecting rod is connected with spline valve shaft, the middle part of the spline valve shaft is connected with limit plate, one end of the limit plate is in contact with another hexagonal head screw, and the hexagonal head screw is connected in the bottom end of shell assembly by hexagonal nut.

[0008] The connecting rod is a U-shaped rod, and the spline valve shaft is an I-shaped rod.

[0009] The outer side of the guide assembly is provided with a thread, and the inner spring is in contact with the thread to adjust the pre-tightening force of the inner spring.

[0010] The middle part of the upper membrane cover is provided with an air inlet, so that the gas source device can transport gas to the inside of the device through the air inlet.

[0011] The left and right ends of the diaphragm are clamped and fixed at the position where the shell assembly and the upper membrane cover are in contact.

[0012] The middle part of the inner side of the shell assembly is provided with a guide assembly, an outer spring mounting groove is provided at the position inside the shell assembly and beside the guide assembly, and the lower part of the outer spring is mounted into the outer spring mounting groove.

[0013] The bottom of the diaphragm plate is provided with an inner spring mounting groove and an outer spring mounting groove, respectively, and the upper part of the outer spring is mounted into the outer spring mounting groove.

[0014] The upper part of the inner spring is arranged in the inner spring mounting groove, and the lower part of the inner spring is arranged at the gap between the outer wall of the outer spring mounting groove of the guide assembly and the shell assembly.

[0015] The diaphragm rod assembly and the guide assembly are slidingly connected, and the diaphragm rod assembly can slide up and down in the middle of the guide assembly.

[0016] The side wall of the shell assembly beside the connecting rod left and right is connected with a cover plate by hexagonal head screw and hexagonal nut.

[0017] The utility model discloses a beneficial effect is: the utility model discloses a kind of angle stroke diaphragm type actuator, design compact and appearance is small, the packaging size of valve and actuator is smaller, it is favorable to enhance its installation flexibility in small stand and large process pipeline, to save precious time;By tightening connecting rod to reduce idle stroke, connecting rod is tightened to spline valve shaft, this single-point connection can reduce the dead zone between actuator and valve, can control the cumulative dead zone of rotary control valve in less than 0.5% range;When installing, right side or left side installation style can be used, without using other parts, it can be converted that the operation mode of actuator and valve assembly is opened by gas to gas off type, and vice versa;Installation operation is convenient, and operation mode can be selected by actual application, increase selection range;With adjustable stroke limit, it can be driven limit plate to realize rising or moving down by adjusting the hex head screw of the bottom of shell assembly, to realize that the minimum of the valve opening degree of external connection is not 0, so as to be applicable to the working condition of normally open valve. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is internal structure schematic view of the utility model.

[0019] Reference signs: 1-shell assembly;2-cover plate;3-limit plate;4-spline valve shaft;5-upper diaphragm cover;51-gas inlet;6-diaphragm plate;8-hex head screw;9-hexagonal nut;10-diaphragm rod assembly;11-diaphragm;12-inner spring;13-outer spring;14-connecting rod;48-guide assembly. DETAILED DESCRIPTION

[0020] Example 1

[0021] The technical scheme of the utility model will be described clearly and completely in connection with the drawings of the utility model.

[0022] As Figure 1 Indicated, the utility model provides a kind of angle stroke diaphragm type actuator, including shell assembly 1, its characterized in that shell assembly 1 upper part is connected with upper diaphragm cover 5 through hex head screw 8 and hexagonal nut 9 left and right, upper diaphragm cover 5 lower part is provided with diaphragm 11, diaphragm 11 lower part is installed diaphragm plate 6, diaphragm plate 6 middle part is connected with diaphragm rod assembly 10 upper end surface through hex head screw 8, diaphragm rod assembly 10 lower part outer side is connected with guide assembly 48, guide assembly 48 outer side is sleeved with inner spring 12, inner spring 12 outer side is provided with outer spring 13, diaphragm rod assembly 10 bottom end is rotatably connected with connecting rod 14, connecting rod 14 is connected with spline valve shaft 4, spline valve shaft 4 middle part is provided with limit plate 3, limit plate 3 one end is in contact with another hex head screw 8, and this hex head screw 8 is fixed in the bottom end of shell assembly 1 by hexagonal nut 9.

[0023] Connecting rod 14 is U-shaped rod, and spline valve shaft 4 is I-shaped.

[0024] The guide assembly 48 is externally provided with threads, and the inner spring 12 is in contact with the threads to adjust the pre-tightening force of the inner spring 12.

[0025] The air inlet 51 is provided in the middle of the upper cover 5 to allow the gas supply device to supply gas to the inside of the device.

[0026] The left and right ends of the diaphragm 11 are clamped and fixed at the position where the outer shell assembly 1 and the upper cover 5 are connected.

[0027] The guide assembly 48 is provided in the middle of the inner side of the outer shell assembly 1, and the outer spring mounting groove is provided at the position inside the outer shell assembly and beside the guide assembly 48, and the lower part of the outer spring 13 is mounted into the outer spring mounting groove.

[0028] The diaphragm plate 6 is provided with the inner spring mounting groove and the outer spring mounting groove at the bottom, and the upper part of the outer spring 13 is mounted into the outer spring mounting groove.

[0029] The upper part of the inner spring 12 is provided in the inner spring mounting groove, and the lower part of the inner spring 12 is provided at the gap between the guide assembly 48 and the outer wall of the outer spring mounting groove of the outer shell assembly 1.

[0030] The diaphragm rod assembly 10 is slidably connected with the guide assembly 48, and the diaphragm rod assembly 10 can slide up and down in the middle of the guide assembly 48.

[0031] The cover plate 2 is connected to the side wall of the outer shell assembly 1 through the hexagonal head screw 8 and the hexagonal nut 9 beside the connecting rod 14.

[0032] Embodiment 2

[0033] In use, the valve outside is connected to the spline valve shaft 4 of the device, and the execution mechanism of the device drives the opening and closing of the valve.

[0034] The specific execution operation is that the gas supply mechanism outside is connected to the air inlet 51 of the upper cover 5, the gas supply mechanism supplies gas to the inside of the upper cover 5, at this time, the gas enters the top cavity of the upper cover 5 through the air inlet 51, and due to the limited cavity space and the setting of the gas supply pressure, the gas directly acts on the diaphragm 11, realizing the pushing of the diaphragm 11. Figure 1As shown, at this time, the diaphragm 11 is driven downward by the gas, and the diaphragm plate 6 is driven downward, and the outer spring 13 and the inner spring 12 are driven to contract, and the diaphragm rod assembly 10 is driven to move downward, and the diaphragm rod assembly 10 is rotatably connected with the connecting rod 14, and the limiting plate 3 arranged opposite to the connecting rod 14 is arranged on the hexagonal head screw 8, the diaphragm rod assembly 10 moves downward, so that the connecting rod 14 drives the spline valve shaft 4 to realize the arc motion at the position where the hexagonal head screw 8 and the limiting plate 2 are connected, and the spline valve shaft 4 is driven to rotate, so that the external valve is opened to an angle of 0-90 degrees, and the control precision of the valve is improved.

[0035] In addition, the hexagonal head screw 8 at the bottom of the shell assembly 1, i.e. the hexagonal head screw 8 in contact with the limiting plate 3, can be rotated to move upward or downward, and the limiting plate 3 drives the spline valve shaft 4 to rotate by a small angle, and the adjustable range is 10-20 degrees, so that the valve is in a normally open state at any opening degree in the range of 10-20 degrees, and meets the normally open working use in some working conditions.

[0036] The basic principle and main features of the utility model and the advantages of the utility model are shown and described. The components mentioned in the utility model are common technical in the prior art, and the skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, and the utility model will have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An angular stroke thin film actuator, characterized by The shell assembly is connected with the upper film cover through hexagonal head screws and hexagonal nuts, the upper film cover is provided with a diaphragm at the lower part, the diaphragm is installed with a diaphragm plate at the lower part, the diaphragm plate is connected with the upper end surface of a diaphragm rod assembly through hexagonal head screws at the middle part, the diaphragm rod assembly is connected with a guide assembly at the outer side of the lower part, the guide assembly is provided with an inner spring, the outer side of the inner spring is provided with an outer spring, the diaphragm rod assembly is connected with a connecting rod at the bottom end, the connecting rod is connected with a spline valve shaft, the spline valve shaft is connected with a limiting plate at the middle part, one end of the limiting plate is in contact with another hexagonal head screw which is connected with the bottom end of the shell assembly through a hexagonal nut.

2. A thin film actuator according to claim 1, wherein The connecting rod is a U-shaped rod, and the spline valve shaft is an I-shaped rod.

3. A thin film angle of rotation actuator according to claim 1 wherein The guide assembly is provided with a thread at the outer side, and the inner spring is in contact with the thread.

4. A thin film angle of rotation actuator according to claim 1 wherein The upper film cover is provided with an air inlet at the middle part.

5. A thin film angle of rotation actuator according to claim 1 wherein The left and right ends of the diaphragm are clamped and fixed at the position where the shell assembly and the upper film cover are connected.

6. A thin film angle of rotation actuator according to claim 1 wherein The guide assembly is provided at the middle part of the inner side of the shell assembly, an outer spring mounting groove is provided at the position inside the shell assembly and beside the guide assembly, and the lower part of the outer spring is mounted into the outer spring mounting groove.

7. A thin film angle of rotation actuator according to claim 6 wherein The diaphragm plate is provided with an inner spring mounting groove and an outer spring mounting groove at the bottom part, the upper part of the outer spring is mounted into the outer spring mounting groove, the upper part of the inner spring is arranged in the inner spring mounting groove, and the lower part of the inner spring is arranged at the gap between the outer wall of the outer spring mounting groove of the guide assembly and the shell assembly.

8. A thin film angle of rotation actuator according to claim 1 wherein The diaphragm rod assembly is slidably connected with the guide assembly, and the diaphragm rod assembly can slide up and down in the middle of the guide assembly.

9. A thin film angle of rotation actuator according to claim 1 wherein The side wall of the shell assembly beside the connecting rod is provided with a cover plate through hexagonal head screws and hexagonal nuts.

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