A novel cylinder stroke control mechanism
By combining photoelectric sensors and limit plates, the movement of the cylinder piston and piston rod is precisely controlled, solving the problem of insufficient power or damage caused by inaccurate control in existing technologies, and realizing the smooth operation and stable output of the cylinder.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 上海勤为智能科技有限公司
- Filing Date
- 2025-07-11
- Publication Date
- 2026-05-26
AI Technical Summary
The existing cylinder stroke control method is inaccurate, resulting in insufficient power or damage to the piston and piston rod, which affects the normal operation of the equipment.
By employing photoelectric sensors and limit plates in conjunction with detection circuits, the solenoid valve is closed precisely when the piston and piston rod reach their designated positions, ensuring smooth cylinder operation and stable power.
It achieves precise control over the movement of the piston and piston rod, ensuring smooth cylinder operation, stable power output, and preventing damage to the piston and piston rod.
Smart Images
Figure CN224283072U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cylinder auxiliary equipment technology, and in particular to a novel cylinder stroke control mechanism. Background Technology
[0002] A cylinder is a pneumatic mechanism widely used in various industries. During operation, relevant equipment (such as a PLC or power switch) energizes the intake and exhaust solenoid valves on both sides of the cylinder. This causes the piston inside the cylinder to drive the piston rod in a reciprocating motion to the left or right, which in turn drives related mechanisms to move. In existing technology, the amount of gas entering the cylinder is generally controlled by controlling the energization time of the solenoid valves, thereby controlling the stroke length of the piston and piston rod to one side.
[0003] While existing cylinder stroke control methods meet practical work needs to some extent, they also have the following technical drawbacks due to technological limitations. Specifically, especially for cylinders installed inside equipment, not easily visible, and requiring frequent reciprocating piston rod movements, if there is a deviation in the designed control circuit, such as the solenoid valve on one side of the cylinder being energized for too long and the air intake time at one end of the cylinder being too long, it is possible that when the solenoid valve on the other side of the cylinder is energized to input compressed air at the other end, air is still being introduced at one end of the cylinder. This will cause the piston to experience stress at both ends, reducing the power output of the piston and piston rod, thus adversely affecting the normal operation of the controlled mechanism, and even leading to damage to the piston or piston rod. (If the compressed air intake time at one or the other end of the cylinder is too short, it will also result in insufficient power output from the cylinder, adversely affecting the normal operation of the controlled mechanism.) In summary, it is still necessary to provide a mechanism that can more accurately control the stroke of the cylinder piston and piston rod. Utility Model Content
[0004] In order to overcome the shortcomings of existing methods for controlling the piston and piston rod stroke in cylinders, which are limited by technology and have the drawbacks described in the background art, this utility model provides a new type of cylinder stroke control mechanism that, under the joint action of related mechanisms, can accurately control the solenoid valve to close and stop the air intake when the piston and / or piston rod move to the correct position, so as to make the cylinder work as smoothly as possible and the output power stable.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A novel cylinder stroke control mechanism includes photoelectric sensors, a limiting plate, and a detection circuit. The limiting plate is fixedly installed on the front end of the piston rod of the cylinder. The piston rod has fixing holes on both sides of the cylinder head. At least two photoelectric sensors are present, each fixedly installed in one of the two fixing holes. The detection circuit is installed in a component box. The signal output terminals of the two photoelectric sensors are electrically connected to the two signal input terminals of the detection circuit. The two signal output terminals of the detection circuit are electrically connected in series between the two power input terminals of the intake and exhaust solenoid valves at the front and rear ends of the cylinder barrel.
[0007] Furthermore, the probes of the two photoelectric sensors and the two sides of the limiting plate are respectively aligned laterally in a straight line.
[0008] Furthermore, of the two photoelectric sensors, the first photoelectric sensor outputs power at its signal output terminal when its probe approaches the obstacle, and the second photoelectric sensor outputs power at its signal output terminal when its probe moves away from the obstacle.
[0009] Furthermore, the detection circuit includes two electrically connected relays, with the negative power input terminals of the two relays connected together.
[0010] Compared with existing technologies, the advantages of this invention are as follows: This invention is mainly used in conjunction with cylinder control. Before use, the detection distance of the two photoelectric sensor probes is pre-adjusted according to control needs. During actual operation, when the piston of the cylinder drives the piston rod and the limiting plate to move left or right, the limiting plate will respectively approach the first photoelectric sensor probe and move away from the second photoelectric sensor probe. In this way, under the action of the detection circuit, the solenoid valve can be closed to stop the air intake when the piston and / or piston rod reach their respective positions. The piston and piston rod will stop working after reaching the corresponding stroke, making the cylinder work as smoothly as possible and the output power stable. Based on the above, this invention has good application prospects. Attached Figure Description
[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0012] Figure 1 This is a schematic diagram of the structure of this utility model.
[0013] Figure 2 This is the circuit diagram of this utility model. Detailed Implementation
[0014] Figure 1 , 2As shown, a novel cylinder stroke control mechanism includes photoelectric sensors W and W2, a limiting plate 1, a power switch S1, a power module W1, and a detection circuit 2. The limiting plate 1 is fixedly installed on the front end of the piston rod of the cylinder 3, and the outer diameter of the limiting plate 1 is smaller than the outer diameter of the connecting shaft at the front end of the piston rod. There is a horizontally distributed fixing hole in the middle of the left and right sides of the cylinder head on one side of the piston rod of the cylinder 3. There are at least two photoelectric sensors W and W2, and the two photoelectric sensors W and W2 are fixedly installed in the two fixing holes respectively. The power switch S1, the power module W1, and the detection circuit 2 are installed in the component box 4, and the component box 4 is installed in the equipment electrical control box.
[0015] Figure 1 , 2 As shown, the probes of two photoelectric sensors W and W2 are positioned at their front ends, aligned with the rear of the limiting plate. The front sides of the probes of the two photoelectric sensors W and W2 and the left and right sides of the rear of the limiting plate 1 are respectively aligned in a straight line. When the probe of the first photoelectric sensor W approaches the obstacle, its signal output terminal outputs power; when the probe of the second photoelectric sensor W2 moves away from the obstacle, its signal output terminal outputs power. The detection circuit includes relays K and K1 connected via circuit board wiring, with the negative power input terminals of the two relays K and K1 connected together.
[0016] Figure 1 , 2 As shown, the power input terminals 1 and 2 of the power module W1 are connected in series with the two poles of the 220V AC power supply via power switch S1. The power output terminals 3 and 4 of the power module W1 are connected to the negative power input terminal of the relay K of the detection circuit, and the power input terminals 1 and 2 of the two photoelectric sensors W and W2 via wires. The signal output terminal 3 of the two photoelectric sensors W and W2 is connected to the positive power input terminals of the two signal input terminals of the detection circuit, relays K and K1 via wires. The positive terminal of the first control power output terminal of the cylinder PLC (existing mature technology, which will not be described in detail in this application, and the PLC is not within the scope of protection of this invention) is connected to the positive power input terminal of the intake and exhaust solenoid valve DC at the front end of the cylinder via the control power input terminal and normally closed contact terminal of relay K. The negative terminal of the first control power output terminal of the cylinder PLC is connected to the negative power input terminal of the intake and exhaust solenoid valve DC at the front end of the cylinder via wire. The positive terminal of the second control power output of the cylinder (such as the PLC) is connected to the positive power input terminal of the intake / exhaust solenoid valve DC1 at the rear end of the cylinder via a wire, through the control power input terminal and normally closed contact terminal of relay K1. The negative terminal of the second control power output of the cylinder (such as the PLC) is connected to the negative power input terminal of the intake / exhaust solenoid valve DC1 at the rear end of the cylinder via a wire. The handle of the power switch S1 is located outside the two openings at the front end of component box 4.
[0017] Figure 1 、 2As shown, this new type of sensor is mainly used in conjunction with cylinder control. Before use, technicians adjust the detection distance of the two photoelectric sensors so that the first photoelectric sensor W can output power at pin 3 when it is close to an obstacle at a suitable distance (for example, the probe of the first photoelectric sensor W outputs power 5 cm behind the limiting plate), and the second photoelectric sensor W1 can output power at pin 3 when it is far away from the obstacle at a suitable distance (for example, the probe of the second photoelectric sensor W1 outputs power 15 cm behind the limiting plate). After turning on the power switch S1, AC 220V power enters pins 1 and 2 of the power module W1, and the power module W1 outputs a stable DC 12V power at pins 3 and 4, which enters the power input terminals of the detection circuit and the two photoelectric sensors. When the PLC's first control power output terminal outputs power to the cylinder, this power flows through the control power input terminal and normally closed contact terminal of relay K to the power input terminal of the intake / exhaust solenoid valve DC. The intake / exhaust solenoid valve DC is normally energized, opening the valve core. Compressed air pushes the internal piston of cylinder 3 backward. When the piston, piston rod, and limit plate 1 have not moved to their final position, the distance between the probe of photoelectric sensor W and the rear end of the limit plate is relatively large. Therefore, pin 3 of photoelectric sensor W does not output a high level, relay K remains de-energized, and its control power input terminal and normally closed contact terminal remain closed. The intake / exhaust solenoid valve DC continues to open, and compressed air enters the front end of the cylinder barrel. When the piston, piston rod, and limit plate 1 move to their final position, the distance between the probe of photoelectric sensor W and the rear end of the limit plate is relatively large. For close proximity (within 5 cm), the photoelectric sensor W outputs a high level at pin 3, energizing the relay K and opening its control power input terminal and normally closed contact terminal. The intake and exhaust solenoid valve DC closes, and compressed air no longer enters the front end of the cylinder barrel. The piston and piston rod stop moving backward (at this moment, the first control power output terminal of the PLC also stops outputting power. In practical applications of this new type, the power output time of the first control power output terminal of the PLC can be relatively short. This ensures that the piston can move to its position due to its inertia and that the stroke of the piston can be precisely controlled by the photoelectric sensor W, etc. If another power switch controls the solenoid valve DC to work, the solenoid valve will be de-energized after the piston moves to its position. Even if the power switch is not temporarily closed, it will not affect the de-energization of the solenoid valve DC after the piston moves to its position).When the second control power output terminal of the PLC controlling the cylinder outputs power, this power enters the power input terminal of the intake / exhaust solenoid valve DC1 via the control power input terminal and normally closed contact terminal of relay K1. The intake / exhaust solenoid valve DC1 is normally energized and its valve core opens. Compressed air pushes the internal piston of cylinder 3 forward. When the piston, piston rod, and limit plate 1 have not moved forward to their designated positions, the probe of photoelectric sensor W2 is relatively close to the rear end of the limit plate. Therefore, pin 3 of photoelectric sensor W2 does not output a high level, relay K1 remains de-energized, and its control power input terminal and normally closed contact terminal are closed. The intake / exhaust solenoid valve DC1 continues to open, and compressed air enters the rear end of the cylinder barrel. When the piston, piston rod, and limit plate 1 move forward to their designated positions, the probe of photoelectric sensor W2 is relatively close to the rear end of the limit plate. At a distance of 15 cm, the photoelectric sensor W2 outputs a high level at pin 3, energizing relay K1 and opening its control power input terminal and normally closed contact terminal. The intake and exhaust solenoid valve DC1 closes, and compressed air no longer enters the rear end of the cylinder barrel. The piston and piston rod stop moving forward (at this moment, the second control power output terminal of the PLC also stops outputting power. In practical applications of this new type, the power output time of the second control power output terminal of the PLC can be relatively short. In this way, due to the inertia of the piston's movement, the piston can move to the position, and due to the control of the photoelectric sensor W2, the stroke of the piston can be precisely controlled to the position. If another power switch controls the solenoid valve DC1 to work, after the piston moves to the position, the solenoid valve DC1 will be de-energized. Even if the power switch is not temporarily closed, it will not affect the de-energization of the solenoid valve DC1 after the piston moves to the position).
[0018] Figure 1 , 2 As shown above, in actual operation, when the piston of the cylinder drives the piston rod and the limiting plate to move forward or backward, the limiting plate will approach the first photoelectric sensor probe and move away from the second photoelectric sensor probe, respectively. In this way, under the action of the detection circuit, the solenoid valve can be closed to stop the air intake when the piston and / or piston rod move to the correct position. The piston and piston rod will stop working after reaching the corresponding stroke, so as to make the cylinder work smoothly and the output power stable as much as possible. Figure 2In this embodiment, the power module is a finished product of AC 220V to DC 12V power module; relays K and K1 are DC 12V; photoelectric sensors W and W1 are finished products of photoelectric switches of model E3F-DS10C4, which have two power input terminals and one signal output terminal. Depending on the model, when there is an obstacle or no obstacle in front of the probe of the photoelectric switch, the signal output terminal outputs power or does not output power. In this embodiment, when there is an obstacle in front of the probe of photoelectric switch W, the signal output terminal outputs power (when there is no obstacle, it does not output power). When there is no obstacle in front of the probe of photoelectric switch W2, the signal output terminal outputs power (when there is an obstacle, it does not output power). The photoelectric switch has a distance adjustment knob. Adjusting to the left increases the detection distance, and adjusting to the right decreases the detection distance. In this embodiment, the distance is adjusted to 5 cm and 15 cm respectively.
[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.
[0020] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A novel cylinder stroke control mechanism, comprising a photoelectric sensor and a limit plate, characterized in that, It also has a detection circuit; the limiting plate is fixedly installed on the front end of the piston rod of the cylinder, and there are fixing holes on both sides of the cylinder head on one side of the piston rod of the cylinder. There are at least two photoelectric sensors, and the two photoelectric sensors are fixedly installed in the two fixing holes respectively; the detection circuit is installed in the component box; the signal output terminals of the two photoelectric sensors and the two signal input terminals of the detection circuit are electrically connected; the two signal output terminals of the detection circuit are electrically connected in series between the two power input terminals of the intake and exhaust solenoid valves on the front and rear sides of the cylinder barrel.
2. The novel cylinder stroke control mechanism according to claim 1, characterized in that, The probes of the two photoelectric sensors and the two sides of the limiting plate are respectively aligned horizontally in a straight line.
3. The novel cylinder stroke control mechanism according to claim 1, characterized in that, In the two photoelectric sensors, the first photoelectric sensor outputs power when its probe approaches the obstacle, and the second photoelectric sensor outputs power when its probe moves away from the obstacle.
4. The novel cylinder stroke control mechanism according to claim 1, characterized in that, The detection circuit includes two electrically connected relays, with the negative power input terminals of the two relays connected.