Cylinder adjustable stroke control circuit based on PLC

Abstract

The utility model discloses an air cylinder adjustable stroke control circuit based on a PLC. The air cylinder adjustable stroke control circuit comprises a stop button, a start button, a magnetic sensor, a programmable controller, a first reversing valve, a second reversing valve and a first air cylinder. The control circuit has the advantages that the cylinder piston rod is controlled to stretch out and draw back in a short stroke when equipment runs, the cylinder piston rod retracts in a full stroke when the equipment stops, a mold at the front end of the cylinder piston rod is convenient to disassemble and adjust, the time required for disassembling and adjusting the mold is shortened, and the cylinder is controlled to work in a short stroke in the production process; the time required for stretching and retracting of the piston rod of the air cylinder during working is shortened, the production efficiency of equipment is improved, the air cylinder consumes less compressed air when working in a short stroke, and an air source can be saved.

Description

Technical Field

[0001] The utility model relates to the field of electrical control, in particular to a PLC-based cylinder adjustable stroke control circuit. Background Art

[0002] Almost all automatic packaging equipment uses a cylinder. The front end of the cylinder's piston rod is generally connected to a mold with a heating function for pressing products or packaging. If a cylinder with a short stroke is selected, firstly, the mold baking the product outer packaging during shutdown is likely to cause quality problems, and secondly, it is very inconvenient to disassemble and repair the mold. Therefore, most manufacturers configure the equipment with a long-stroke cylinder; however, the longer the cylinder stroke, the longer the time required for the cylinder piston rod to extend and retract. The long-stroke cylinder affects the equipment speed, resulting in low production efficiency, and consumes more compressed air, which is not conducive to energy saving. Summary of the invention

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to provide a PLC-based adjustable stroke control circuit for a cylinder, which has the function of controlling the cylinder piston rod to extend and retract in a short stroke when the equipment is running, and retracting the cylinder piston rod to a full stroke when the equipment is shut down. Since the cylinder works in a short stroke during the production process, the time required for the cylinder piston rod to extend and retract is shortened, thereby improving the production efficiency of the equipment. The cylinder consumes less compressed air when working in a short stroke, thereby saving air source.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a PLC-based cylinder adjustable stroke control circuit, including a stop button, a start button, a magnetic sensor, a programmable controller, a first reversing valve, a second reversing valve, and a first cylinder;

[0005] The lower end of the stop button SB2 is electrically connected to the input side X0 end of the programmable controller PLC1, the lower end of the start button SB1 is electrically connected to the input side X1 end of the programmable controller PLC1, the lower end of the magnetic sensor SQ1 is electrically connected to the input side X2 end of the programmable controller PLC1, and the upper end of the stop button SB2, the upper end of the start button SB1, the upper end of the magnetic sensor SQ1, and the output side COM1 end of the programmable controller PLC1 are electrically connected to the output power 24V end of the programmable controller PLC1;

[0006] The output side Y1 end of the programmable controller PLC1 is electrically connected to the first end of the coil of the first reversing valve YV1, the output side Y2 end of the programmable controller PLC1 is electrically connected to the first end of the coil of the second reversing valve YV2, and the input side S / S end of the programmable controller PLC1, the second end of the coil of the first reversing valve YV1, and the second end of the coil of the second reversing valve YV2 are electrically connected to the output power supply 0V end of the programmable controller PLC1 at the same time;

[0007] The power input side L terminal of the programmable controller PLC1 is electrically connected to the power supply L, and the power input side N terminal of the programmable controller PLC1 is electrically connected to the power supply N. When the power input side L terminal and the N terminal of the programmable controller PLC1 are powered on, there is a 24V voltage between the output power 24V terminal and the 0V terminal of the programmable controller PLC1;

[0008] When there is no 24V voltage at both ends of the coils of the first reversing valve YV1 and the second reversing valve YV2, the P port of the reversing valve is connected to the B port, and the A port is connected to the R port; when there is a 24V voltage at both ends of the coils of the first reversing valve YV1 and the second reversing valve YV2, the P port of the reversing valve is connected to the A port, and the B port is connected to the S port; the P port of the first reversing valve YV1 is the compressed air source inlet, the A port of the first reversing valve YV1 is connected to the upper left side air path interface of the first cylinder QG1, and the B port of the first reversing valve YV1 is connected to the lower left side air path interface of the first cylinder QG1;

[0009] The A port of the second reversing valve YV2 is blocked, the R port of the second reversing valve YV2 is blocked, the S port of the second reversing valve YV2 is blocked, and the R port of the first reversing valve YV1 is connected to the P port of the second reversing valve YV2;

[0010] When the system starts to run, the output side Y1 end of the programmable controller PLC1 is connected to COM1, and the output side Y2 end of the programmable controller PLC1 is disconnected from COM1. There is a 24V voltage at both ends of the coil of the first reversing valve YV1 and there is no 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the P port of the first reversing valve YV1 and flows out of the A port, and then enters the cylinder body from the upper left side air path interface of the first cylinder QG1 to push the piston down and extend the piston rod. At the same time, the air in the cylinder body below the piston of the first cylinder QG1 flows out from the lower left side air path interface of the first cylinder QG1, and then flows into the S port through the B port of the first reversing valve YV1 and is discharged. When the piston of the first cylinder QG1 descends and passes the position of the magnetic sensor SQ1, the input side X2 end of the programmable controller PLC1 receives the output signal of the magnetic sensor SQ1. When it changes from ON to OFF, at this time, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is connected to COM1, there is no 24V voltage at both ends of the coil of the first reversing valve YV1 and there is 24V voltage at both ends of the coil of the second reversing valve YV2, and the compressed air flows into the P port of the first reversing valve YV1 and flows out of the B port, and then enters the cylinder body from the lower left side air path interface of the first cylinder QG1 to push the piston upward. Due to the blocking of the A port of the second reversing valve YV2, the compressed air in the upper cylinder body of the piston of the first cylinder QG1 cannot be discharged from the A port of the second reversing valve YV2 through the upper left side air path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, the P port of the second reversing valve YV2, and at this time, the piston of the first cylinder QG1 remains stationary;

[0011] When receiving the pressing command signal, the output side Y1 end of the programmable controller PLC1 is connected to COM1, the output side Y2 end of the programmable controller PLC1 is disconnected from COM1, the two ends of the coil of the first reversing valve YV1 have a 24V voltage, and the two ends of the coil of the second reversing valve YV2 do not have a 24V voltage, the compressed air flows from the P port of the first reversing valve YV1 and flows out from the A port, and then enters the cylinder body from the upper left side air path interface of the first cylinder QG1 to push the piston down and extend the piston rod to press the product, and at the same time, the air in the lower cylinder body of the first cylinder QG1 is discharged from the lower left side air path interface of the first cylinder QG1. The compressed air flows out from the P port of the first reversing valve YV1 and then flows into the S port through the B port of the first reversing valve YV1 and is discharged; after the pressing work is completed, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, the output side Y2 end of the programmable controller PLC1 is disconnected from COM1, there is no 24V voltage at both ends of the coil of the first reversing valve YV1 and there is no 24V voltage at both ends of the coil of the second reversing valve YV2, the compressed air flows into the B port from the P port of the first reversing valve YV1 and then flows into the cylinder body from the lower left side air path interface of the first cylinder QG1, pushing the piston upward to retract the piston rod, and at the same time making the upper piston of the first cylinder QG1 The air in the cylinder body passes through the upper left air path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, and then flows into the B port from the P port of the second reversing valve YV2 and is discharged. When the piston of the first cylinder QG1 rises to the position of the magnetic sensor SQ1, the input side X2 end of the programmable controller PLC1 receives the output signal of the magnetic sensor SQ1 and changes from OFF to ON. At this time, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is connected to COM1, and the first reversing valve YV1 is turned on. There is no 24V voltage at both ends of the coil of the second reversing valve YV2 and there is 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the P port of the first reversing valve YV1 and flows out of the B port, enters the cylinder body from the lower left side air path interface of the first cylinder QG1, and pushes the piston upward. Since the A port of the second reversing valve YV2 is blocked, the compressed air in the upper cylinder body of the piston of the first cylinder QG1 cannot pass through the upper left side air path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, the P port of the second reversing valve YV2, and is discharged from the A port of the second reversing valve YV2. The piston of the first cylinder QG1 remains stationary.

[0012] In the above-mentioned PLC-based cylinder adjustable stroke control circuit, the S port of the first reversing valve YV1 is connected to an adjustable muffler. By adjusting the adjustable muffler at the S port of the first reversing valve YV1, the speed at which the piston of the first cylinder QG1 descends can be adjusted.

[0013] In the above-mentioned PLC-based cylinder adjustable stroke control circuit, the B port of the second reversing valve YV2 is connected to an adjustable muffler. By adjusting the adjustable muffler at the B port of the second reversing valve YV2, the rising speed of the piston of the first cylinder QG1 can be adjusted.

[0014] In the above-mentioned PLC-based cylinder adjustable stroke control circuit, the piston of the first cylinder QG1 is provided with a magnetic ring, and the telescopic stroke of the first cylinder QG1 when working can be changed by adjusting the position of the magnetic sensor SQ1.

[0015] Compared with the prior art, the beneficial effects of the utility model are: it can control the cylinder piston rod to extend and retract in a short stroke when the equipment is running, and retract the cylinder piston rod to a full stroke when the equipment is shut down, which is convenient for the disassembly, assembly and adjustment of the mold at the front end of the cylinder piston rod and shortens the time required for the disassembly, assembly and adjustment of the mold, and avoids quality problems caused by the outer packaging of the heated mold-baked products when the equipment is shut down. During the production process, the cylinder works in a short stroke, shortening the time required for the extension and retraction of the cylinder piston rod, thereby improving the production efficiency of the equipment. The cylinder consumes less compressed air when working in a short stroke, thus saving gas source. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a PLC-based cylinder adjustable stroke control circuit provided by an embodiment of the utility model;

[0018] Figure 2 It is a PLC input and output schematic diagram of a PLC-based cylinder adjustable stroke control circuit provided by an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the initial positions of the first reversing valve YV1, the second reversing valve YV2, and the first cylinder QG1 of a cylinder adjustable stroke control circuit based on PLC provided by an embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the gas path direction when a system of a PLC-based cylinder adjustable stroke control circuit provided by an embodiment of the utility model starts to operate, with 24V voltage at both ends of the coil of the first reversing valve YV1 and no 24V voltage at both ends of the coil of the second reversing valve YV2;

[0021] Figure 5It is a schematic diagram of the gas path direction of a cylinder adjustable stroke control circuit based on PLC provided by the embodiment of the utility model, in which when the piston of the first cylinder QG1 descends and passes through the position of the magnetic sensor SQ1 and the output signal of the magnetic sensor SQ1 changes from ON to OFF, there is no 24V voltage at both ends of the coil of the first reversing valve YV1 and there is 24V voltage at both ends of the coil of the second reversing valve YV2;

[0022] Figure 6 It is a schematic diagram of the gas path direction when a PLC-based cylinder adjustable stroke control circuit provided by the embodiment of the utility model just receives a pressing command signal, and there is a 24V voltage at both ends of the coil of the first reversing valve YV1 and there is no 24V voltage at both ends of the coil of the second reversing valve YV2;

[0023] Figure 7 It is a schematic diagram of the gas path direction when a PLC-based cylinder adjustable stroke control circuit provided by the embodiment of the utility model just receives a pressing command signal, there is a 24V voltage at both ends of the coil of the first reversing valve YV1, there is no 24V voltage at both ends of the coil of the second reversing valve YV2, and the piston rod of the first cylinder QG1 is fully extended;

[0024] Figure 8 It is a schematic diagram of the gas path direction of the cylinder adjustable stroke control circuit based on PLC provided by the embodiment of the utility model after the pressing work is completed, both ends of the coil of the first reversing valve YV1 and both ends of the coil of the second reversing valve YV2 have no 24V voltage, and the piston of the first cylinder QG1 rises and the piston rod begins to retract;

[0025] Fig. 9 It is a schematic diagram of the gas path direction of a cylinder adjustable stroke control circuit based on PLC provided by an embodiment of the utility model. After the pressing work is completed, when the piston of the first cylinder QG1 rises to the position of the magnetic sensor SQ1, the output signal of the magnetic sensor SQ1 is ON, there is no 24V voltage at both ends of the coil of the first reversing valve YV1, and there is a 24V voltage at both ends of the coil of the second reversing valve YV2;

[0026] Reference numerals

[0027] Stop button SB2, start button SB1, magnetic sensor SQ1, programmable controller PLC1, first reversing valve YV1, second reversing valve YV2, first cylinder QG1. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0029] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0030] It should also be understood that the terms used in this utility model embodiment specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model embodiments. As used in the utility model embodiment specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] Example

[0032] like Figures 1 to 9 As shown, the utility model is a PLC-based cylinder adjustable stroke control circuit, including a stop button SB2, a start button SB1, a magnetic sensor SQ1, a programmable controller PLC1, a first reversing valve YV1, a second reversing valve YV2, and a first cylinder QG1.

[0033] The lower end of the stop button SB2 is electrically connected to the input side X0 end of the programmable controller PLC1, the lower end of the start button SB1 is electrically connected to the input side X1 end of the programmable controller PLC1, the lower end of the magnetic sensor SQ1 is electrically connected to the input side X2 end of the programmable controller PLC1, and the upper end of the stop button SB2, the upper end of the start button SB1, the upper end of the magnetic sensor SQ1, and the output side COM1 end of the programmable controller PLC1 are electrically connected to the output power 24V end of the programmable controller PLC1;

[0034] The output side Y1 end of the programmable controller PLC1 is electrically connected to the first end of the coil of the first reversing valve YV1, the output side Y2 end of the programmable controller PLC1 is electrically connected to the first end of the coil of the second reversing valve YV2, and the input side S / S end of the programmable controller PLC1, the second end of the coil of the first reversing valve YV1, and the second end of the coil of the second reversing valve YV2 are electrically connected to the output power supply 0V end of the programmable controller PLC1 at the same time;

[0035] The power input side L terminal of the programmable controller PLC1 is electrically connected to the power supply L, and the power input side N terminal of the programmable controller PLC1 is electrically connected to the power supply N. When the power input side L terminal and the N terminal of the programmable controller PLC1 are powered on, there is a 24V voltage between the output power 24V terminal and the 0V terminal of the programmable controller PLC1;

[0036] When there is no 24V voltage at both ends of the coils of the first reversing valve YV1 and the second reversing valve YV2, the P port of the reversing valve is connected to the B port, and the A port is connected to the R port; when there is a 24V voltage at both ends of the coils of the first reversing valve YV1 and the second reversing valve YV2, the P port of the reversing valve is connected to the A port, and the B port is connected to the S port; the P port of the first reversing valve YV1 is the compressed air source inlet, the A port of the first reversing valve YV1 is connected to the upper left side air path interface of the first cylinder QG1, and the B port of the first reversing valve YV1 is connected to the lower left side air path interface of the first cylinder QG1;

[0037] The A port of the second reversing valve YV2 is blocked, the R port of the second reversing valve YV2 is blocked, the S port of the second reversing valve YV2 is blocked, and the R port of the first reversing valve YV1 is connected to the P port of the second reversing valve YV2;

[0038] When the system starts running, the output side Y1 end of the programmable controller PLC1 is connected to COM1, and the output side Y2 end of the programmable controller PLC1 is disconnected from COM1. There is a 24V voltage at both ends of the coil of the first reversing valve YV1 and there is no 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the P port of the first reversing valve YV1 and flows out of the A port, and then enters the cylinder body from the upper left side air path interface of the first cylinder QG1 to push the piston down and extend the piston rod. At the same time, the air in the cylinder body below the piston of the first cylinder QG1 flows out from the lower left side air path interface of the first cylinder QG1, and then flows into the S port through the B port of the first reversing valve YV1 and is discharged. When the piston of the first cylinder QG1 descends and passes the position of the magnetic sensor SQ1, the input side X2 end of the programmable controller PLC1 receives the output signal of the magnetic sensor SQ1. When it changes from ON to OFF, at this time, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is connected to COM1, there is no 24V voltage at both ends of the coil of the first reversing valve YV1, and there is 24V voltage at both ends of the coil of the second reversing valve YV2, and the compressed air flows into the P port of the first reversing valve YV1 and flows out of the B port, and then enters the cylinder body from the lower left side air path interface of the first cylinder QG1 to push the piston upward. Due to the blocking of the A port of the second reversing valve YV2, the compressed air in the upper cylinder body of the piston of the first cylinder QG1 cannot be discharged from the A port of the second reversing valve YV2 through the upper left side air path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, the P port of the second reversing valve YV2, and at this time, the piston of the first cylinder QG1 remains stationary;

[0039] When receiving the pressing command signal, the output side Y1 end of the programmable controller PLC1 is connected to COM1, the output side Y2 end of the programmable controller PLC1 is disconnected from COM1, the two ends of the coil of the first reversing valve YV1 have a 24V voltage, and the two ends of the coil of the second reversing valve YV2 do not have a 24V voltage, and the compressed air flows into the A port from the P port of the first reversing valve YV1, and then enters the cylinder body from the upper left side air path interface of the first cylinder QG1 to push the piston down and extend the piston rod to press the product, and at the same time, the air in the lower cylinder body of the first cylinder QG1 flows out from the lower left side air path interface of the first cylinder QG1 , and then flows into the S port through the B port of the first reversing valve YV1 and is discharged; after the pressing work is completed, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, the output side Y2 end of the programmable controller PLC1 is disconnected from COM1, there is no 24V voltage at both ends of the coil of the first reversing valve YV1 and there is no 24V voltage at both ends of the coil of the second reversing valve YV2, the compressed air flows into the B port from the P port of the first reversing valve YV1, and then enters the cylinder body from the lower left side air path interface of the first cylinder QG1, pushes the piston upward to retract the piston rod, and at the same time makes the air in the upper cylinder body of the piston of the first cylinder QG1 The gas flows through the upper left gas path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, and then flows into the B port from the P port of the second reversing valve YV2 and is discharged. When the piston of the first cylinder QG1 rises to the position of the magnetic sensor SQ1, the input side X2 end of the programmable controller PLC1 receives the output signal of the magnetic sensor SQ1 and changes from OFF to ON, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is connected to COM1, and the two ends of the coil of the first reversing valve YV1 are There is no 24V voltage and there is 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the P port of the first reversing valve YV1 and flows out of the B port, enters the cylinder body from the lower left side air path interface of the first cylinder QG1, and pushes the piston upward. Since the A port of the second reversing valve YV2 is blocked, the compressed air in the upper cylinder body of the piston of the first cylinder QG1 cannot pass through the upper left side air path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, the P port of the second reversing valve YV2, and is discharged from the A port of the second reversing valve YV2. At this time, the piston of the first cylinder QG1 remains stationary.

[0040] Specifically, the S port of the first reversing valve YV1 is connected to an adjustable muffler, and the speed of the piston of the first cylinder QG1 when descending can be adjusted by adjusting the adjustable muffler of the S port of the first reversing valve YV1.

[0041] Specifically, the B port of the second reversing valve YV2 is connected to an adjustable muffler. By adjusting the adjustable muffler at the B port of the second reversing valve YV2, the speed at which the piston of the first cylinder QG1 rises can be adjusted.

[0042] Specifically, the piston of the first cylinder QG1 is provided with a magnetic ring, and the telescopic stroke of the first cylinder QG1 when working can be changed by adjusting the position of the magnetic sensor SQ1.

[0043] Now we will further explain the use of the PLC-based cylinder adjustable stroke control circuit:

[0044] Press the start button SB1, the system starts running, the output side Y1 end of the programmable controller PLC1 is connected to COM1, and the output side Y2 end of the programmable controller PLC1 is disconnected from COM1. At this time, there is a 24V voltage at both ends of the coil of the first reversing valve YV1, and there is no 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the A port from the P port of the first reversing valve YV1 and then enters the cylinder body from the upper left side air path interface of the first cylinder QG1 to push the piston down and extend the piston rod. At the same time, the air in the cylinder body below the piston of the first cylinder QG1 flows out from the lower left side air path interface of the first cylinder QG1, and then flows into the S port through the B port of the first reversing valve YV1 and is discharged. When the piston of the first cylinder QG1 descends and passes the position of the magnetic sensor SQ1, the input side X2 end of the programmable controller PLC1 receives the magnetic sensor SQ1. When the output signal changes from ON to OFF, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is connected to COM1. There is no 24V voltage at both ends of the coil of the first reversing valve YV1, and there is 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the B port from the P port of the first reversing valve YV1 and flows out, and then enters the cylinder body from the lower left side air path interface of the first cylinder QG1 to push the piston upward. Since the A port of the second reversing valve YV2 is blocked, the compressed air in the upper cylinder body of the piston of the first cylinder QG1 cannot be discharged from the A port of the second reversing valve YV2 through the upper left side air path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, the P port of the second reversing valve YV2, and at this time, the piston of the first cylinder QG1 remains stationary;

[0045] When receiving the pressing command signal, the output side Y1 end of the programmable controller PLC1 is connected to COM1, and the output side Y2 end of the programmable controller PLC1 is disconnected from COM1. At this time, there is a 24V voltage at both ends of the coil of the first reversing valve YV1, and there is no 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the A port from the P port of the first reversing valve YV1, and then enters the cylinder body from the upper left side air path interface of the first cylinder QG1 to push the piston down and extend the piston rod to press the product. At the same time, the air in the lower cylinder body of the first cylinder QG1 flows out from the lower left side air path interface of the first cylinder QG1, and then After that, it flows into the S port through the B port of the first reversing valve YV1 and is discharged; after the pressing work is completed, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is disconnected from COM1. At this time, there is no 24V voltage at both ends of the coil of the first reversing valve YV1, and there is no 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the B port from the P port of the first reversing valve YV1 and flows out, and then enters the cylinder body from the lower left side air path interface of the first cylinder QG1, pushes the piston upward to retract the piston rod, and at the same time makes the air in the upper cylinder body of the piston of the first cylinder QG1 pass through in sequence. The air flows from the upper left side air circuit interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, and then flows from the P port of the second reversing valve YV2 to the B port and is discharged. When the piston of the first cylinder QG1 rises to the position of the magnetic sensor SQ1, the input side X2 end of the programmable controller PLC1 receives the output signal of the magnetic sensor SQ1 as ON, at this time, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is connected to COM1. There is no 24V voltage at both ends of the coil of the first reversing valve YV1, and the second reversing valve YV2 is ON. There is a 24V voltage at both ends of the coil of 2, and the compressed air flows into the P port of the first reversing valve YV1 and flows out of the B port, and enters the cylinder body from the lower left side gas path interface of the first cylinder QG1 to push the piston upward. Due to the blocking of the A port of the second reversing valve YV2, the compressed air in the cylinder body above the piston of the first cylinder QG1 cannot be discharged from the A port of the second reversing valve YV2 through the upper left side gas path interface of the first cylinder QG1, the A port of the first reversing valve YV1, the R port of the first reversing valve YV1, the P port of the second reversing valve YV2, and at this time, the piston of the first cylinder QG1 remains stationary, waiting for the next pressing command signal, and the cycle works in this way;

[0046] During the working process, when the stop button SB2 is pressed, after waiting for the pressing work to be completed, the output side Y1 end of the programmable controller PLC1 is disconnected from COM1, and the output side Y2 end of the programmable controller PLC1 is disconnected from COM1. At this time, there is no 24V voltage at both ends of the coil of the first reversing valve YV1, and there is no 24V voltage at both ends of the coil of the second reversing valve YV2. The compressed air flows into the B port from the P port of the first reversing valve YV1 and flows out, and then enters the cylinder body from the lower left side air path interface of the first cylinder QG1 to push the piston upward to retract the piston rod, and at the same time, the air in the upper cylinder body of the piston of the first cylinder QG1 flows from the P port of the second reversing valve YV2 to the B port and is discharged. When the piston of the first cylinder QG1 rises to the position of the magnetic sensor SQ1 and the output signal of the magnetic sensor SQ1 is ON, the output side Y1 end of the programmable controller PLC1 and COM1, and the output side Y2 end of the programmable controller PLC1 and COM1 continue to be disconnected until the piston rod of the first cylinder QG1 is completely retracted and the system stops working.

[0047] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0048] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A PLC-based cylinder adjustable stroke control circuit, characterized in that: The PLC-based cylinder adjustable stroke control circuit includes: Stop button (SB2), start button (SB1), magnetic sensor (SQ1), programmable controller (PLC1), first reversing valve (YV1), second reversing valve (YV2), first cylinder (QG1); The lower end of the stop button (SB2) is electrically connected to the input side X0 end of the programmable controller (PLC1), the lower end of the start button (SB1) is electrically connected to the input side X1 end of the programmable controller (PLC1), the lower end of the magnetic sensor (SQ1) is electrically connected to the input side X2 end of the programmable controller (PLC1), and the upper end of the stop button (SB2), the upper end of the start button (SB1), the upper end of the magnetic sensor (SQ1), and the output side COM1 end of the programmable controller (PLC1) are electrically connected to the output power supply 24V end of the programmable controller (PLC1); The output side Y1 end of the programmable controller (PLC1) is electrically connected to the first end of the coil of the first reversing valve (YV1), the output side Y2 end of the programmable controller (PLC1) is electrically connected to the first end of the coil of the second reversing valve (YV2), and the input side S / S end of the programmable controller (PLC1), the second end of the coil of the first reversing valve (YV1), and the second end of the coil of the second reversing valve (YV2) are electrically connected to the output power supply 0V end of the programmable controller (PLC1) at the same time; The power input side L end of the programmable controller (PLC1) is electrically connected to the power supply L, the power input side N end of the programmable controller (PLC1) is electrically connected to the power supply N, and when the power input side L end and the N end of the programmable controller (PLC1) are powered on, there is a 24V voltage between the output power 24V end and the 0V end of the programmable controller (PLC1); When there is no 24V voltage at both ends of the coils of the first reversing valve (YV1) and the second reversing valve (YV2), the P port of the reversing valve is connected to the B port, and the A port is connected to the R port; when there is a 24V voltage at both ends of the coils of the first reversing valve (YV1) and the second reversing valve (YV2), the P port of the reversing valve is connected to the A port, and the B port is connected to the S port; the P port of the first reversing valve (YV1) is the compressed air source inlet, the A port of the first reversing valve (YV1) is connected to the upper left side air path interface of the first cylinder (QG1), and the B port of the first reversing valve (YV1) is connected to the lower left side air path interface of the first cylinder (QG1); The A port of the second reversing valve (YV2) is blocked, the R port of the second reversing valve (YV2) is blocked, the S port of the second reversing valve (YV2) is blocked, and the R port of the first reversing valve (YV1) is connected to the P port of the second reversing valve (YV2).

2. The PLC-based cylinder adjustable stroke control circuit according to claim 1 is characterized in that: The S port of the first reversing valve (YV1) is connected to an adjustable muffler.

3. The PLC-based cylinder adjustable stroke control circuit according to claim 1, characterized in that: The B port of the second reversing valve (YV2) is connected to an adjustable muffler.

4. The PLC-based cylinder adjustable stroke control circuit according to claim 1, characterized in that: The piston of the first cylinder (QG1) is provided with a magnetic ring.

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