Pneumatic execution system with protection box and pneumatic execution equipment

Abstract

The utility model discloses a pneumatic execution system with a protective box and pneumatic execution equipment. The pneumatic execution system with the protection box comprises a positioner, an air cylinder, the protection box, a feedback device, a feedback linear rod and a gas pipeline. The cylinder is a double-rod cylinder and comprises a first piston rod and a second piston rod; the gas pipeline is connected with the air cylinder and used for ventilating or exhausting air into cavities in the two sides of the air cylinder. The protection box is arranged on one side of a second piston rod of the cylinder; the feedback linear rod and the feedback device are sealed in the protection box; the positioner is arranged on the gas pipeline; the feedback device is connected with a feedback shaft of the positioner, the feedback linear rod is connected with the tail end of the second piston rod, the feedback device makes contact with the feedback linear rod, and the feedback device feeds back displacement of the piston rods to the positioner along with stretching and retracting of the second piston rod. According to the utility model, the full protection of the feedback mechanism can be realized, the occurrence of execution faults is effectively avoided, the service life of elements is prolonged, and the occupied space is smaller.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic technical field especially relates to a kind of pneumatic execution system and pneumatic execution equipment with protective box. BACKGROUND

[0002] Pneumatic actuator is usually used in steel, power, ore dressing and other industries, for controlling the opening of valve, these working conditions site is usually quite bad, dust is serious.

[0003] In prior art, pneumatic actuator is acted by positioner to cylinder, and the opening and closing of valve is controlled by the displacement of cylinder, and displacement signal is transmitted between positioner and cylinder through position feedback device, and feedback device is installed outside, or the whole pneumatic actuator is placed in box.

[0004] In actual application, if feedback device is installed outside, spring, bearing, feedback shaft, feedback linear plate and other components are exposed, and dust and other impurities in environment are easy to enter feedback device, so that feedback linear plate is not smooth in movement and failure occurs.

[0005] If the whole pneumatic actuator is placed in box, positioner is poor in heat dissipation, and the whole structure is large in appearance, and installation space is limited. UTILITY MODEL CONTENTS

[0006] In view of the above problems, the utility model is proposed to provide a kind of pneumatic execution system and pneumatic execution equipment to overcome the above problems or at least partially solve the above problems.

[0007] In the first aspect, the utility model embodiment provides a kind of pneumatic execution system with protective box, comprising: positioner, cylinder, protective box, feedback device, feedback linear rod and gas pipeline;

[0008] The cylinder is double-rod cylinder, comprising first piston rod as execution end and second piston rod as non-execution end;

[0009] The gas pipeline is connected with the cylinder, for air or exhaust to the two side cavities of cylinder, to control the movement of first piston rod and second piston rod of cylinder;

[0010] The protective box is arranged on the side of the second piston rod of cylinder;Feedback linear rod and feedback device are sealed in the protective box;

[0011] The positioner is arranged on the gas pipeline;The feedback device is connected with the feedback shaft of positioner, feedback linear rod is connected with the end of second piston rod, the feedback device contacts with feedback linear rod, and the displacement of piston rod is fed back to positioner along with the extension and contraction of second piston rod.

[0012] In one embodiment, the pneumatic actuating system further comprises a mounting fixed plate.

[0013] The positioner is arranged above the cylinder and is fixedly connected with the protection box through the mounting fixed plate.

[0014] In one embodiment, the gas pipeline is further provided with a filter pressure reducing valve, a pressure switch, a lock valve, a solenoid valve and an amplifier.

[0015] The filter pressure reducing valve and the pressure switch are arranged on the gas supply side of the gas source; the solenoid valve, the amplifier and the lock valve are connected to the pipelines for gas inlet and gas outlet of the two cavities of the cylinder.

[0016] The solenoid valve is used for controlling the pilot pressure of the lock valve.

[0017] The filter pressure reducing valve is used for controlling the pressure of the gas source and filtering the moisture and dust in the gas source.

[0018] The amplifier is used for improving the driving speed of the cylinder.

[0019] In one embodiment, the solenoid valve is a two-position three-way solenoid valve.

[0020] In one embodiment, the pressure switch is a digital output switch.

[0021] In one embodiment, the pneumatic actuating system further comprises a three-break alarm protection module; the pressure switch, the solenoid valve and the positioner are respectively connected to the three-break alarm protection module through cables.

[0022] The three-break alarm protection module is used for judging whether the gas break, power break and signal break occur according to the signals fed back by the pressure switch, the solenoid valve and the positioner, and sending an alarm signal and locking the positions of the first piston rod and the second piston rod of the cylinder when the gas break, the power break and the signal break occur.

[0023] In one embodiment, the three-break alarm protection module is arranged above the protection box.

[0024] In one embodiment, the filter pressure reducing valve is arranged in front of the protection box.

[0025] In one embodiment, the amplifier is arranged behind the protection box.

[0026] In a second aspect, the embodiments of the utility model provide a pneumatic actuating device, and the device comprises the pneumatic actuating system with the protection box.

[0027] The above technical solutions provided by the embodiments of the utility model have at least the following beneficial effects:

[0028] The pneumatic execution system with the protection box and the pneumatic execution equipment provided by the embodiment of the utility model realize the full protection of the feedback mechanism on the basis of accurately controlling the displacement of the cylinder, moisture, dust and other impurities cannot enter the inside of the box body, effectively avoid the occurrence of execution failure, improve the service life of the element, the system and the equipment structure is compact, easy to install and maintain, and the occupied space is smaller.

[0029] And, the pneumatic execution system with the protection box provided by the embodiment of the utility model further is provided with three break alarm protection modules, when the breakage, power failure and signal breakage fault conditions occur, timely alarm signals are sent and the position of the piston rod of the cylinder is locked, and the degree of automation is higher.

[0030] Other features and advantages of the utility model will be set forth in the subsequent specification, and partially become obvious from the specification, or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structure specially pointed out in the written specification, claims and drawings.

[0031] The technical scheme of the utility model will be further described in detail below by the drawings and the embodiments. DRAWINGS

[0032] The drawings are used to provide further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0033] Figure 1 It is the front view of the pneumatic execution system with the protection box in the embodiment of the utility model;

[0034] Figure 2 It is the front view of the pneumatic execution system with the protection box in the embodiment of the utility model Figure 1 It is the enlarged schematic view of P part in the embodiment of the utility model;

[0035] Figure 3 It is the plan view of the pneumatic execution system with the protection box in the embodiment of the utility model;

[0036] Figure 4 It is the internal structure schematic view of the pneumatic execution system with the protection box in the embodiment of the utility model after removing the protection box;

[0037] Figure 5 It is the schematic view of each component on the gas circuit in the embodiment of the utility model.

[0038] Mark explanation:

[0039] 1-positioner; 2-cylinder; 3-protection box; 4-feedback device; 5-feedback linear bar, 6-mounting fixed plate; 7-filter pressure reducing valve; 8-pressure switch; 9-locking valve; 10-solenoid valve; 11-three-break alarm protection module; 12-first piston rod; 13-second piston rod; 14-gas pipeline; 15-amplifier; 41-feedback bearing. DETAILED DESCRIPTION

[0040] Exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0041] Exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0042] In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "back", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should be explained that the terms "installation", "connection", "connection" should be understood broadly unless otherwise specified and limited, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In order to solve the problems in the prior art, the present application provides a pneumatic execution system with a protection box, which is described with reference to Figure 1 , Figure 2 , Figure 3 andFigure 4 As shown in the drawings, the pneumatic actuating system comprises a positioner 1, a cylinder 2, a protection box 3, a feedback device 4, a feedback linear rod 5 and a gas pipeline 14, wherein:

[0045] The cylinder 2 is a double-rod cylinder, comprising a first piston rod 12 as an execution end and a second piston rod 13 as a non-execution end.

[0046] The gas pipeline 14 is connected with the cylinder 2, and is used for air supply or air exhaust to the two side cavities of the cylinder 2, so as to control the movement of the first piston rod 12 and the second piston rod 13 of the cylinder 2.

[0047] The protection box 3 is arranged on one side of the second piston rod 13 of the cylinder 2, and the feedback linear rod 5 and the feedback device 4 are sealed in the protection box 3.

[0048] The positioner 1 is arranged on the gas pipeline 14, the feedback device 4 is connected with a feedback shaft of the positioner 1, the feedback linear rod 5 is connected with the end of the second piston rod 13, the feedback device 4 is in contact with the feedback linear rod 5, and the feedback device 4 feeds back the displacement of the piston rod to the positioner 1 along with the extension and retraction of the second piston rod 13.

[0049] In the embodiment of the utility model, the cylinder 2 is a double-rod linear cylinder, wherein the first piston rod 12 is an execution end, and the second piston rod 13 is a non-execution end, and the second piston rod 13 is a feedback end connected with the positioner 1.

[0050] The first piston rod 12 and the second piston rod 13 are linked, and the movement directions thereof are opposite (one is extended, and the other is retracted, or vice versa) relative to the cavity of the cylinder 2, but the displacements of the movements are consistent.

[0051] In one embodiment, the above-mentioned pneumatic actuating system, as shown in Figure 1 and Figure 2 may further comprise a mounting fixed plate 6.

[0052] The positioner 1 is arranged above the cylinder 2 and is fixedly connected with the protection box 3 through the mounting fixed plate 6.

[0053] In one embodiment, the above-mentioned pneumatic actuating system, as shown in Figure 1 and Figure 5 the gas pipeline 14 is further provided with a filter pressure reducing valve 7, a pressure switch 8, a lock valve 9, a solenoid valve 10 and an amplifier 15.

[0054] The filter pressure reducing valve 7 and the pressure switch 8 are arranged on the air supply side of the gas source, the solenoid valve 10, the amplifier 15 and the lock valve 9 are connected with the pipelines for air supply and air exhaust of the two cavities of the cylinder 2.

[0055] The solenoid valve 10 is used for controlling the pilot pressure of the lock valve 9.

[0056] The amplifier 15 is used for improving the driving speed of the cylinder 2, and the stability of the execution system is better;

[0057] The amplifier 15 is arranged between the filter pressure reducing valve 7 and the locking valve 9.

[0058] In an embodiment, the amplifier 15 can be arranged at the rear of the protection box 3 in the structural design.

[0059] The filter pressure reducing valve 7 is the inlet of the gas source, and is used for controlling the pressure of the gas source and filtering the moisture and dust contained in the gas source.

[0060] The filter pressure reducing valve 7 can be arranged at the front of the box body of the protection box 3, for example, to facilitate the pressure adjustment of the operator.

[0061] In an embodiment, the above-mentioned electromagnetic valve 10 is a two-position three-way electromagnetic valve, and is used for controlling the pilot pressure of the locking valve 9.

[0062] In an embodiment, the positioner 1 can be an intelligent positioner, for example.

[0063] In an embodiment, the pressure switch 8 can be a digital output switch, for example.

[0064] Referring to Figure 2 The feedback device 4 can include a spring, a feedback bearing 41 and the like, for example, as shown in the amplification schematic view. The feedback device 4 is used for connecting the feedback shaft of the positioner 1, is placed in the protection box 3, and the feedback bearing 41 of the feedback device 4 is in contact with the feedback linear rod 5. The feedback shaft moves in the box body along with the expansion and contraction of the piston rod (the first piston rod and the second piston rod), realizes the linkage between the feedback shaft of the positioner 1 and the piston rod, and feeds back the displacement of the first piston rod 12 to the processor in the positioner 1.

[0065] In an embodiment, the pneumatic execution system provided by the utility model embodiment can further include a three-break alarm protection module 11, as shown in Figure 1 and Figure 3 The three-break alarm protection module 11 is used for judging whether the gas breakage, power breakage and signal breakage occur according to the signals fed back by the pressure switch 8, the electromagnetic valve 10 and the positioner 1, and sending an alarm signal and locking the positions of the first piston rod 12 and the second piston rod 13 of the cylinder 2 when the gas breakage, the power breakage and the signal breakage occur.

[0066] The pressure switch 8, the electromagnetic valve 10 and the positioner 1 are respectively electrically connected to the three-break alarm protection module 11 through cables.

[0067] The three-break alarm protection module 11 is used for judging whether the gas breakage, power breakage and signal breakage occur according to the signals fed back by the pressure switch 8, the electromagnetic valve 10 and the positioner 1, and sending an alarm signal and locking the positions of the first piston rod 12 and the second piston rod 13 of the cylinder 2 when the gas breakage, the power breakage and the signal breakage occur.

[0068] Figure 5The schematic diagram of each component on the gas circuit is shown, the solid line part represents the gas circuit, the dotted line represents the circuit, from Figure 5 It can be seen that the electromagnetic valve, the positioner and the pressure switch are electrically connected with the three-break alarm protection module 11 through the circuit.

[0069] In an embodiment, the above-mentioned three-break alarm protection module 11 can be arranged above the protection box 3.

[0070] Referring to Figure 5 As shown, the pressure switch, the electromagnetic valve and the positioner are connected to the three-break alarm protection module through the cable, realizing various types of alarms, such as outputting a gas break alarm signal, outputting a power break alarm signal, outputting a signal break alarm signal and the like, and having a locking function.

[0071] Specifically, when the signal value of any one of the gas source pressure, the voltage and the current is lower than the preset threshold value, the three-break alarm protection module receives the signal to send an alarm signal, and cuts off the current or the voltage signal, so as to cut off the pressure signal of the locking valve, lock the first piston rod of the cylinder at the position before the alarm, and further make the valve of the pneumatic actuator remain in the original state.

[0072] The working process of the pneumatic execution system with the protection box provided in the embodiment of the utility model is as follows:

[0073] When the positioner input current signal increases, the pressure on the OUTl side of the positioner rises, flows to the rear cavity of the cylinder through the gas pipeline, the first piston rod of the cylinder makes an extension movement, the second piston rod makes a retraction movement, thereby driving the feedback linear rod to move, the bearing of the feedback device rotates, the positioner feedback shaft rotates clockwise through the positioner connecting shaft, the positioner feedback shaft acts on the internal angle sensor, and the positioner input current is consistent with the output position of the cylinder through the internal processing loop of the positioner.

[0074] The embodiment of the utility model further provides a pneumatic execution device, the device includes the pneumatic execution system with the protection box as described above.

[0075] In the pneumatic execution system with the protection box and the pneumatic execution device provided in the embodiment of the utility model, the cylinder adopts a double-rod cylinder, the protection box is installed at one end of the piston rod, the feedback linear rod and the feedback device are enclosed in the protection box, the full protection of the feedback mechanism is realized, moisture, dust and other impurities cannot enter the inside of the box body, the occurrence of execution failure is effectively avoided, the service life of the element is improved, the system and the device are compact in structure, convenient to install and maintain, small in occupied space, and can accurately control the displacement of the cylinder, realize fault alarm and locking, and are high in automation degree.

[0076] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A pneumatic actuation system with a guard box, characterized in that, The device comprises: a positioner, a cylinder, a protection box, a feedback device, a feedback linear rod and a gas pipeline; the cylinder is a double-rod cylinder, comprising a first piston rod as an execution end and a second piston rod as a non-execution end; the gas pipeline is connected with the cylinder, for air supply or exhaust to the two side cavities of the cylinder to control the movement of the first and second piston rods of the cylinder; the protection box is arranged on one side of the second piston rod of the cylinder; the feedback linear rod and the feedback device are sealed in the protection box; the positioner is arranged on the gas pipeline; the feedback device is connected with the feedback shaft of the positioner, the feedback linear rod is connected with the end of the second piston rod, the feedback device is in contact with the feedback linear rod, and the feedback device feeds back the displacement of the piston rod to the positioner with the extension and retraction of the second piston rod.

2. The pneumatic actuating system of claim 1, wherein, Further comprising: a mounting fixed plate; the positioner is arranged above the cylinder and is fixedly connected with the protection box through the mounting fixed plate.

3. The pneumatic actuation system of claim 1, wherein, The gas pipeline is further provided with a filter pressure reducing valve, a pressure switch, a lock valve, a solenoid valve and an amplifier; the filter pressure reducing valve and the pressure switch are arranged on the air supply side of the gas source; the solenoid valve, the amplifier and the lock valve are connected to the pipelines for air inlet and outlet of the two cavities of the cylinder; the solenoid valve is used for controlling the pilot pressure of the lock valve; the filter pressure reducing valve is used for controlling the pressure of the gas source and filtering the moisture and dust in the gas source; the amplifier is used for improving the driving speed of the cylinder.

4. The pneumatic actuation system of claim 3, wherein, The solenoid valve is a two-position three-way solenoid valve.

5. The pneumatic actuation system of claim 3, wherein, The pressure switch is a digital output switch.

6. The pneumatic actuation system of claim 3, wherein, Further comprising: a three-break alarm protection module; the pressure switch, the solenoid valve and the positioner are respectively connected to the three-break alarm protection module through cables; the three-break alarm protection module is used for judging whether the conditions of air break, power break and signal break occur according to the signals fed back by the pressure switch, the solenoid valve and the positioner, and sending an alarm signal and locking the positions of the first and second piston rods of the cylinder when the conditions occur.

7. The pneumatic actuation system of claim 6, wherein, The three-break alarm protection module is arranged above the protection box.

8. The pneumatic actuation system of claim 3, wherein, The filter pressure reducing valve is arranged in front of the protection box.

9. The pneumatic actuation system of claim 3, wherein, The amplifier is arranged behind the protection box.

10. A pneumatic actuating device, characterized by The device comprises the pneumatic execution system with the protection box according to any one of claims 1-9.

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