Control device to accurately control the cylinder's stopping position

Abstract

This utility model relates to a control device for accurately controlling the stopping position of a cylinder. The device includes a cylinder, a first speed-regulating valve, a first check valve, a first solenoid valve, a second speed-regulating valve, a second check valve, and a second solenoid valve. The first speed-regulating valve and the first check valve are directly connected in series via an air pipe and are also connected to the cylinder. An air pipe leads from port A of the first solenoid valve and branches into two branch pipes via a first tee connector. The second speed-regulating valve and the second check valve are directly connected in series via an air pipe and are also connected to the cylinder. An air pipe leads from port A of the second solenoid valve and branches into two branch pipes via a second tee connector. Using this control device for accurately controlling the stopping position of the cylinder, accurate cylinder positioning is achieved, and smooth cylinder operation is ensured. It overcomes the influence of load on the cylinder's descent speed and maintains a stable stop at the set position even under load, improving the cylinder's operational stability.

Description

Technical Field

[0001] This utility model relates to the field of concrete pipe pile manufacturing, and more particularly to the field of automatic oiling operation and automatic release agent spraying operation, specifically referring to a control device for accurately controlling the stop position of the cylinder. Background Technology

[0002] Current technologies often involve manual application of oil or release agent, which requires significant manpower. Another approach uses a cylinder as the power actuator for the lifting mechanism to replace the motor and automatically raise and lower the oiling roller and release agent nozzle. While cylinders are relatively inexpensive and easy to control, accurately stopping the cylinder at any given position with consistent repeatability presents a challenge. Furthermore, the load on the cylinder's end is often heavy, and the cylinder's descent speed is often unstable, preventing it from stopping precisely at any point and causing operational failure. This results in the equipment failing to achieve its design goals and leading to unstable production. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a control device that achieves accurate control of the cylinder's stop position, which is characterized by high stability, simple structure, and wide applicability.

[0004] To achieve the above objectives, the control device of this utility model for accurately controlling the cylinder's stop position is as follows:

[0005] The control device for accurately controlling the stopping position of the cylinder is characterized by comprising a cylinder, a first speed regulating valve, a first check valve, a first solenoid valve, a second speed regulating valve, a second check valve, a second solenoid valve, a direct-flow speed regulating valve, and a third solenoid valve. The first speed regulating valve and the first check valve are directly connected in series via an air pipe. The first speed regulating valve is also connected to the pressure-bearing air inlet of the cylinder. An air pipe leads out from port A of the first solenoid valve and then branches into two branch pipes through a first tee connector. One branch pipe is connected to the air port interface of the second check valve, and the other branch pipe is connected to the first speed control valve through the first check valve; the second speed control valve and the second check valve are directly connected in series through an air pipe, and the second speed control valve is also connected to the air inlet of the cylinder rod chamber. An air pipe is led out from the A port of the second solenoid valve and then branched into two branch pipes through the second tee connector. One branch pipe is connected to the air port interface of the first check valve, and the other branch pipe is connected to the second speed control valve through the second check valve.

[0006] Preferably, the device further includes a first solenoid valve and a second solenoid valve, and the device further includes a direct-flow speed control valve and a third solenoid valve, wherein the direct-flow speed control valve and the third solenoid valve are connected in parallel, and a set of parallel direct-flow speed control valves and third solenoid valves are connected in series between the second speed control valve and the second solenoid valve.

[0007] Preferably, the B port of the first solenoid valve is sealed with a pipe plug; the B port of the second solenoid valve is also sealed with a pipe plug.

[0008] Preferably, the device further includes a pull rope sensor and a pull rope fixing plate, wherein the pull rope sensor is connected to the piston rod of the cylinder through the pull rope fixing plate.

[0009] Preferably, the P2 port of the second check valve is connected to the air pipeline leading out from the A port of the second solenoid valve. The second check valve is equipped with a one-way valve. When the cylinder extends, the first solenoid valve opens, and the first speed control valve introduces compressed air into the cylinder from the air inlet on the pressurized side of the cylinder. The compressed air enters from the P port of the second check valve through the air pipeline and opens the one-way valve. The compressed air on the cylinder extension side is discharged through the second speed control valve, the straight-through speed control valve and the third solenoid valve. The piston rod of the cylinder extends, and the pull rope sensor detects the extension distance of the piston rod in real time.

[0010] Preferably, when the cylinder retracts, the first and second solenoid valves open, the third solenoid valve closes, the second speed control valve introduces compressed air into the cylinder from the cylinder extension side inlet, the compressed air enters through the air pipe from the P port of the first check valve and opens the one-way valve, the compressed air in the cylinder pressure side is discharged through the first speed control valve and the first solenoid valve, the cylinder piston rod retracts, and the pull rope sensor detects the movement distance of the piston rod retraction in real time.

[0011] Preferably, the piston rod extension of the cylinder includes a rapid extension phase or a deceleration extension phase. When the piston rod is in the rapid extension phase, the first, second, and third solenoid valves are all open, and the third solenoid valve rapidly discharges compressed air. When the piston rod is in the deceleration extension phase, the first and second solenoid valves are open, the third solenoid valve is closed, and the direct-flow speed control valve regulates and slowly discharges compressed air.

[0012] The control device of this invention, which accurately controls the stopping position of a cylinder, effectively solves the problem that a cylinder cannot accurately stop at any position under load. This method enables accurate cylinder positioning and ensures smooth cylinder operation. It overcomes the influence of load on the cylinder's descent speed and maintains a stable stop at the set position under load, thus improving the cylinder's operational stability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the control device of the present invention for accurately controlling the stopping position of the cylinder.

[0014] Figure label:

[0015] 101 cylinders

[0016] 102 First speed control valve

[0017] 103 First Check Valve

[0018] 104 First Solenoid Valve

[0019] 105 Second Speed ​​Control Valve

[0020] 106 Second Check Valve

[0021] 107 Straight-through speed control valve

[0022] 108 Second Solenoid Valve

[0023] 109 Third Solenoid Valve

[0024] 110 pull rope sensor

[0025] 111 Pull Rope Fixing Plate Detailed Implementation

[0026] To more clearly describe the technical content of this utility model, the following description is provided in conjunction with specific embodiments.

[0027] This utility model discloses a control device for accurately controlling the stopping position of a cylinder, comprising a cylinder 101, a first speed regulating valve 102, a first check valve 103, a first solenoid valve 104, a second speed regulating valve 105, a second check valve 106, and a second solenoid valve 108. The first speed regulating valve 102 and the first check valve 103 are directly connected in series via an air pipe. The first speed regulating valve 102 is also connected to the pressure-bearing air inlet of the cylinder 101. An air pipe leads out from port A of the first solenoid valve 104 and then branches into two branch pipes through a first tee connector W1. One of the branch pipes connects to the second solenoid valve 108. The check valve 106 is connected to the air port Z2, and another branch line is connected to the first speed control valve 102 through the first check valve 103; the second speed control valve 105 and the second check valve 106 are directly connected in series through an air pipe, and the second speed control valve 105 is also connected to the air inlet of the rod chamber of the cylinder 101. After the A port of the second solenoid valve 108 leads out an air pipe, it branches into two branch lines through the second three-way connector W2. One branch line is connected to the air port Z1 of the first check valve 103, and the other branch line is connected to the second speed control valve 105 through the second check valve 106.

[0028] In a preferred embodiment of the present invention, the device further includes a direct-flow speed control valve 107 and a third solenoid valve 109, wherein the direct-flow speed control valve 107 and the third solenoid valve 109 are connected in parallel, and a set of parallel direct-flow speed control valves 107 and 109 are connected in series between the second speed control valve 105 and the second solenoid valve 108.

[0029] In a preferred embodiment of the present invention, the B port of the first solenoid valve 104 is sealed with a pipe plug; the B port of the second solenoid valve 108 is sealed with a pipe plug.

[0030] In a preferred embodiment of the present invention, the device further includes a pull rope sensor 110 and a pull rope fixing plate 111, wherein the pull rope sensor 110 is connected to the piston rod of the cylinder 101 through the pull rope fixing plate 111.

[0031] In a preferred embodiment of this utility model, the P2 port of the second check valve 106 is connected to the air pipeline leading out from the A port of the second solenoid valve 108. The second check valve 106 is provided with a one-way valve. When the cylinder 101 extends, the first solenoid valve 104 opens, and the first speed regulating valve 102 introduces compressed air into the cylinder 101 from the air inlet on the pressure side of the cylinder 101. The compressed air enters from the P2 port of the second check valve 106 through the air pipeline and opens the one-way valve. The compressed air on the extension side of the cylinder 101 is discharged through the second speed regulating valve 105, the direct speed regulating valve 107 and the third solenoid valve 109. The piston rod of the cylinder 101 extends, and the pull rope sensor 110 detects the extension movement distance of the piston rod in real time.

[0032] In a preferred embodiment of this utility model, when the cylinder 101 retracts, the first solenoid valve 104 and the second solenoid valve 108 open, the third solenoid valve 109 closes, the second speed regulating valve 105 introduces compressed air into the cylinder 101 from the air inlet on the extension side of the cylinder 101, the compressed air enters through the air pipe from the P port of the first check valve 103 and opens the one-way valve, the compressed air in the pressure side of the cylinder 101 is discharged through the first speed regulating valve 102 and the first solenoid valve 104, the piston rod of the cylinder 101 retracts, and the pull rope sensor 110 detects the moving distance of the piston rod retraction in real time.

[0033] In a preferred embodiment of this utility model, the piston rod extension of the cylinder 101 includes a rapid extension stage or a deceleration extension stage. When the piston rod of the cylinder 101 is in the rapid extension stage, the first solenoid valve 104, the second solenoid valve 108, and the third solenoid valve 109 are all open, and the third solenoid valve 109 rapidly discharges compressed air. When the piston rod of the cylinder 101 is in the deceleration extension stage, the first solenoid valve 104 and the second solenoid valve 108 are open, the third solenoid valve 109 is closed, and the direct-flow speed regulating valve 107 regulates and slowly discharges compressed air.

[0034] This utility model belongs to the field of concrete pipe pile manufacturing, specifically relating to occasions where there are specific requirements for the lifting position. Such occasions often do not require very high precision, but a certain degree of repeatability is required to meet the usage requirements. For example, automatic oiling and automatic release agent spraying equipment for bottom molds requires that the oiling roller and release agent spraying nozzle be accurately stopped at the set position according to different pipe mold numbers, so as to realize automatic oiling and automatic release agent spraying operations.

[0035] This invention mainly achieves accurate positioning of the cylinder and overcomes the influence of the load's gravity on the cylinder's descent process. At the same time, it ensures that the cylinder can accurately and stably stop at the set position under load, thus achieving the purpose of stable lifting or lateral movement. Figure 1 Schematic diagram of the air circuit for cylinder positioning.

[0036] In a specific embodiment of this utility model, the air passage of the cylinder 101 is connected, the first speed regulating valve 102 is connected to the first check valve 103 and then connected to the air inlet on the pressure side of the cylinder 101, the air port Z2 of the second check valve 106 is connected to the first three-way connector W1 between the first check valve 103 and the first solenoid valve 104, and the B port of the first solenoid valve 104 is sealed with a pipe plug.

[0037] like Figure 1 As shown, the first check valve 103 and the first speed control valve 102 are directly connected in series via an air pipe; after an air pipe is led out from port A of the first solenoid valve 104, two branch pipes are branched out through the first tee connector W1. One branch pipe is connected to the second check valve 106, and the other branch pipe is connected to the first speed control valve 102 through the first check valve 103.

[0038] After the second speed control valve 105 is connected to the second check valve 106, it is connected to the air inlet of the rod chamber of the cylinder 101. A set of parallel direct-flow speed control valves 107 and third solenoid valves 109 are connected in series between the second speed control valve 105 and the second solenoid valve 108. The air port Z1 of the first check valve 103 is connected to the second three-way connector W2 between the second check valve 106 and the second solenoid valve 108, and the B port of the second solenoid valve 108 is blocked by a pipe plug.

[0039] like Figure 1 As shown, the second check valve 106 and the second speed control valve 105 are directly connected in series via an air pipe; after an air pipe is led out from port A of the second solenoid valve 108, two branch pipes are branched out through the second three-way connector W2. One branch pipe is connected to the first check valve 103, and the other branch pipe is connected to the second speed control valve 105 through the second check valve 106.

[0040] A gas pipe is led out from the middle of the connecting pipeline between the second speed control valve 105 and the straight-through speed control valve 107 via a three-way pipe connector and directly connected to the P port of the third solenoid valve 109. The pull rope sensor 110 is connected to the piston rod of the cylinder 101 via the pull rope fixing plate 111 to detect the piston rod's stroke.

[0041] Control Principle: To ensure the cylinder stops smoothly under load at any position, during the descent process, both the pressure-bearing and extension-side air inlets need to be supplied simultaneously to maintain cylinder pressure balance. Simultaneously, the piston rod's movement position can be monitored in real time. When cylinder 101 extends, the first solenoid valve 104 opens, and compressed air enters the cylinder through the pressure-bearing side air inlet of cylinder 101 via the first speed control valve 102. Simultaneously, compressed air enters through the air pipe from the P port of the second check valve 106, opening the internal one-way valve. The P port of the second check valve 106 is connected to the air pipe leading from the A port of the second solenoid valve 108. The internal one-way valve is a structure within the second check valve 106; it opens when subjected to external air pressure and remains closed when no pressure is received. At this time, the compressed air in the cylinder's extension side is discharged through the second speed control valve 105, the direct-flow speed control valve 107, and the third solenoid valve 109, extending the cylinder piston rod. The pull rope sensor 110 continuously monitors the piston rod's extension distance.

[0042] The piston rod extends in two stages: rapid extension and deceleration extension. During the rapid extension stage, the first solenoid valve 104, the second solenoid valve 108, and the third solenoid valve 109 are all open, and compressed air is quickly discharged through the third solenoid valve 109. During the deceleration extension stage, the first solenoid valve 104 and the second solenoid valve 108 are open, and the third solenoid valve 109 is closed. At this time, the compressed air can be slowly discharged through the adjustment of the direct-flow speed control valve 107, so that the piston rod descends slowly, thereby achieving accurate positioning.

[0043] When the cylinder retracts, the first solenoid valve 104 and the second solenoid valve 108 open, and the third solenoid valve 109 closes. At this time, compressed air enters the cylinder from the air inlet on the extension side of the cylinder 101 through the second speed regulating valve 105. Simultaneously, compressed air enters from the P port of the first check valve 103 through the air pipe, thereby opening the internal one-way valve. At this time, the compressed air in the cylinder on the pressure side is discharged through the first speed regulating valve 102 and the first solenoid valve 104, and the cylinder piston rod retracts. At this time, the pull rope sensor 110 detects the movement distance of the piston rod retraction in real time.

[0044] The present invention employs a mechanism consisting of a cylinder, a solenoid valve, a check valve, a speed control valve, and a pull rope sensor based on cost considerations. This solution is not limited to replacing the above components with an electric push cylinder; other actuators with servo motors or other controllable strokes can also be used to achieve the above technical objectives.

[0045] This invention provides a control method for accurately positioning a cylinder, which effectively solves the problem that a cylinder cannot accurately stop at any position under load. This method achieves accurate cylinder positioning and ensures smooth cylinder operation. It overcomes the influence of load on the cylinder's descent speed and maintains a stable stop at the set position under load, thus improving the cylinder's operational stability.

[0046] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0047] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0048] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The control device of this invention, which accurately controls the stopping position of a cylinder, effectively solves the problem that a cylinder cannot accurately stop at any position under load. This method enables accurate cylinder positioning and ensures smooth cylinder operation. It overcomes the influence of load on the cylinder's descent speed and maintains a stable stop at the set position under load, thus improving the cylinder's operational stability.

[0051] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A control device for accurately controlling the stopping position of a cylinder, characterized in that, The device includes a cylinder, a first speed control valve, a first check valve, a first solenoid valve, a second speed control valve, a second check valve, and a second solenoid valve. The first speed control valve and the first check valve are directly connected in series via an air pipe. The first speed control valve is also connected to the pressurized air inlet of the cylinder. An air pipe leads out from port A of the first solenoid valve and branches into two branch pipes through a first tee connector. One branch pipe is connected to the air port interface of the second check valve, and the other branch pipe is connected to the first speed control valve through the first check valve. The second speed control valve and the second check valve are directly connected in series via an air pipe. The second speed control valve is also connected to the rod chamber air inlet of the cylinder. An air pipe leads out from port A of the second solenoid valve and branches into two branch pipes through a second tee connector. One branch pipe is connected to the air port interface of the first check valve, and the other branch pipe is connected to the second speed control valve through the second check valve.

2. The control device for accurately controlling the cylinder's stopping position according to claim 1, characterized in that, The device further includes a direct-flow speed control valve and a third solenoid valve, wherein the direct-flow speed control valve and the third solenoid valve are connected in parallel, and a set of parallel direct-flow speed control valves and third solenoid valves are connected in series between the second speed control valve and the second solenoid valve.

3. The control device for accurately controlling the cylinder's stopping position according to claim 1, characterized in that, The B port of the first solenoid valve is sealed with a pipe plug; the B port of the second solenoid valve is sealed with a pipe plug.

4. The control device for accurately controlling the cylinder's stopping position according to claim 1, characterized in that, The device also includes a pull rope sensor and a pull rope fixing plate, wherein the pull rope sensor is connected to the piston rod of the cylinder through the pull rope fixing plate.

5. The control device for accurately controlling the cylinder's stopping position according to claim 2, characterized in that, The P2 port of the second check valve is connected to the air pipeline leading out from the A port of the second solenoid valve. The second check valve is equipped with a one-way valve. When the cylinder extends, the first solenoid valve opens, and the first speed control valve introduces compressed air into the cylinder from the air inlet on the pressurized side of the cylinder. The compressed air enters from the P port of the second check valve through the air pipeline and opens the one-way valve. The compressed air on the cylinder extension side is discharged through the second speed control valve, the straight-through speed control valve and the third solenoid valve. The piston rod of the cylinder extends, and the pull rope sensor detects the extension distance of the piston rod in real time.

6. The control device for accurately controlling the cylinder's stopping position according to claim 2, characterized in that, When the cylinder retracts, the first and second solenoid valves open, the third solenoid valve closes, and the second speed control valve introduces compressed air into the cylinder from the cylinder extension side inlet. The compressed air enters through the air pipe from the P port of the first check valve and opens the one-way valve. The compressed air in the cylinder on the pressurized side is discharged through the first speed control valve and the first solenoid valve, and the piston rod of the cylinder retracts. The pull rope sensor detects the movement distance of the piston rod retraction in real time.

7. The control device for accurately controlling the cylinder's stopping position according to claim 5, characterized in that, The piston rod extension of the cylinder includes a rapid extension phase or a deceleration extension phase. When the piston rod is in the rapid extension phase, the first, second, and third solenoid valves are all open, and the third solenoid valve rapidly discharges compressed air. When the piston rod is in the deceleration extension phase, the first and second solenoid valves are open, the third solenoid valve is closed, and the direct-flow speed control valve regulates and slowly discharges compressed air.

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