Electromagnet structure for monitoring work of electromagnet by placing sensor in electromagnetic pipe

Abstract

The electromagnet structure comprises a shell, a coil part is installed in the shell, a magnet yoke is installed on the side, close to an opening of the shell, of the coil part, a magnetic core pipe is installed in the middle of the coil part, and a push rod is installed in the magnetic core pipe. An electromagnet structure for monitoring the work of an electromagnet by a sensor is arranged in an electromagnetic tube, an inductance type proximity switch mainly comprises an induction surface iron core, a coil, an oscillation circuit, a trigger circuit, an amplification output circuit and the like, the induction surface iron core and the coil form an inductor, and an alternating electromagnetic field is generated around the inductor through high-frequency alternating current; the oscillation circuit generates an alternating current to be supplied to the coil so as to drive the inductor to generate an electromagnetic field. The trigger circuit is used for detecting changes of an electromagnetic field and triggering corresponding actions, and the amplification output circuit amplifies output signals of the trigger circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnets, in particular to an electromagnet structure in which a sensor is arranged inside an electromagnetic tube to monitor the operation of the electromagnet. Background Art

[0002] As a new type of electro-hydraulic control element between on-off control and servo control, the solenoid proportional valve continuously and proportionally controls the pressure, flow, and direction in the hydraulic system based on electrical signals, and can prevent hydraulic shock. Due to its structural design, process performance, and price, which are between on-off control elements and servo control, it has been widely used in recent years. As the control element of the solenoid valve, the electromagnet plays a vital role in the solenoid valve. However, during the use of the electromagnet, it is necessary to observe the position change of the tongue iron in the electromagnet between the attracted position and the retracted position. Because the electromagnet is covered and sealed on the outside, the position of the tongue iron cannot be effectively observed.

[0003] However, the utility model has the following problems when actually used:

[0004] Nowadays, sensor electromagnets are all used outside the proportional electromagnet. If they are set outside the electromagnet, the cost of electromagnet monitoring will increase. Although the engagement position and retraction position of the tongue iron can be monitored in real time, the usage space is greatly increased and the cost of the electromagnet is increased. In addition, most of them cannot still have the function of manually pushing the tongue iron to reset. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides an electromagnet structure in which a sensor is placed inside the electromagnetic tube to monitor the operation of the electromagnet, thereby solving the problems in the prior art:

[0006] Now the sensor is applied to the switch electromagnet. The switch electromagnet does not need to detect every position of the moving iron core. It only needs to detect the attraction position and retraction position of the moving iron core inside the magnetic tube. On the multi-way valve, the faulty electromagnet can be quickly found based on the feedback of the sensor.

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: an electromagnet structure in which a sensor is placed inside an electromagnetic tube to monitor the operation of the electromagnet, comprising a shell, a coil portion is installed inside the shell, a magnetic yoke is installed on the side of the coil portion close to the opening of the shell, a magnetic core tube is installed in the middle of the coil portion, a push rod is installed inside the magnetic core tube, a tongue iron is installed inside the magnetic core tube, a fastening bolt is installed at the other end of the magnetic core tube through a thread, an inductive proximity switch is provided at one end of the magnetic core tube close to the fastening bolt by riveting, an inductive surface iron core is installed in the middle of the inductive proximity switch, the inductive proximity switch includes a coil, an oscillation circuit, a trigger circuit and an amplified output short circuit, a manual push rod is installed in the middle of the inductive surface iron core, and a reset spring is sleeved on the end of the manual push rod exposed to the outside.

[0008] Optionally, the inductive proximity switch is externally connected to a detection device via a circuit board and a switching line.

[0009] Optionally, the sensing surface and the internal cavity of the inductive proximity switch and the magnetic core tube are coated with epoxy resin for protection.

[0010] Optionally, the exteriors of the fastening bolts, the inductive proximity switch, the sensing surface iron core, and the manual push rod are all sleeved with sealing rings.

[0011] The utility model provides an electromagnet structure in which a sensor is placed inside an electromagnetic tube to monitor the operation of the electromagnet, which has the following beneficial effects:

[0012] 1. The sensor is placed inside the electromagnetic tube to monitor the electromagnet's working structure. The inductive proximity switch mainly consists of a sensing surface iron core, a coil, an oscillation circuit, a trigger circuit, and an amplifier output circuit. The sensing surface iron core and the coil form an inductor. An alternating electromagnetic field is generated around it by high-frequency alternating current. The oscillation circuit generates an alternating current to supply the coil, thereby driving the inductor to generate an electromagnetic field. The trigger circuit is used to detect changes in the electromagnetic field and trigger corresponding actions. The amplifier output circuit amplifies the output signal of the trigger circuit for subsequent control or signal processing, thereby achieving the purpose of monitoring the tongue iron's attracted and retracted positions. This allows the electromagnet to provide real-time data feedback during use, ensuring the safety and stability of the electromagnet.

[0013] 2. The electromagnet structure in which a sensor is placed inside the electromagnetic tube to monitor the operation of the electromagnet solves the problem of lacking the structure and function of the manual reset tongue iron after adding the induction switch through the setting of the manual push rod and the reset spring, thereby ensuring that the electromagnet cannot be manually reset when the power is off. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a schematic diagram of the structure of the utility model.

[0015] Figure 2 For this utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0016] Figure 3 This is a schematic diagram of the detailed structure of the utility model.

[0017] In the figure: 1. Housing; 2. Coil part; 3. Magnetic yoke; 4. Magnetic core tube; 5. Push rod; 6. Tongue iron; 7. Fastening bolt; 8. Inductive proximity switch; 9. Sensing surface iron core; 10. Manual push rod; 11. Return spring. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 3 The utility model provides a technical solution: an electromagnet structure in which a sensor is placed inside an electromagnetic tube to monitor the operation of the electromagnet, comprising a shell 1, a coil portion 2 is installed inside the shell 1, a yoke 3 is installed on the side of the coil portion 2 close to the opening of the shell 1, a magnetic core tube 4 is installed in the middle of the coil portion 2, a push rod 5 is installed inside the magnetic core tube 4, a tongue iron 6 is installed inside the magnetic core tube 4, a fastening bolt 7 is installed at the other end of the magnetic core tube 4 through a thread, an inductive proximity switch 8 is provided at one end of the magnetic core tube 4 close to the fastening bolt 7 by riveting, an inductive surface iron core 9 is installed in the middle of the inductive proximity switch 8, the inductive proximity switch 8 includes a coil, an oscillation circuit, a trigger circuit and an amplified output short circuit, a manual push rod 10 is installed in the middle of the inductive surface iron core 9, and a reset spring 11 is sleeved on the end of the manual push rod 10 exposed to the outside.

[0020] The inductive proximity switch 8 is externally connected to the detection equipment via a circuit board and adapter cable. The sensing surface and internal cavity of the inductive proximity switch 8 and the magnetic core tube 4 are coated with epoxy resin for protection. Sealing rings are provided around the fastening bolts 7, the inductive proximity switch 8, the sensing surface iron core 9, and the manual push rod 10. In the present utility model, the inductive proximity switch is an existing product, such as an existing miniature proximity switch sensor, employing inductive metal sensing, with normally open or normally closed selected as needed.

[0021] In the present invention, the working steps of the device are as follows:

[0022] The inductive proximity switch is mainly composed of an inductive surface iron core, a coil, an oscillation circuit, a trigger circuit and an amplifier output circuit. The inductive surface iron core and the coil form an inductor, which generates an alternating electromagnetic field around it through high-frequency alternating current. The oscillation circuit generates an alternating current to supply the coil, thereby driving the inductor to generate an electromagnetic field. The trigger circuit is used to detect changes in the electromagnetic field and trigger corresponding actions. The amplifier output circuit amplifies the output signal of the trigger circuit for subsequent control or signal processing.

[0023] When the metal object being measured approaches the inductive proximity switch, the free electrons inside the metal object are affected by the alternating electromagnetic field, generating an eddy current effect. The eddy current effect consumes the electromagnetic field energy of the proximity switch, causing the electromagnetic field to weaken or change. This change is sensed by the inductive surface core and coil, which in turn affects the operation of the oscillation circuit. The signal comparator in the oscillation circuit detects this change and outputs a control signal. This control signal is processed by the trigger circuit and the amplification output circuit and finally output to the device that needs to be controlled on site.

[0024] Specifically, when a metal object approaches an inductive proximity switch, the free electrons within it generate eddy currents under the influence of the electromagnetic field. This consumes the electromagnetic field energy of the proximity switch, thereby changing the operating state of the oscillation circuit. This change is captured by the detection circuit, which in turn generates an output signal. This output signal can trigger an external device to perform a corresponding action, such as starting, stopping, or changing state.

[0025] Inductive proximity switches have many advantages, such as small size, high repeatability, long service life, good anti-interference performance, and high reliability.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnet structure in which a sensor is placed inside an electromagnetic tube to monitor the operation of the electromagnet, comprising a housing (1), characterized in that: A coil portion (2) is installed inside the shell (1), a magnetic yoke (3) is installed on one side of the coil portion (2) close to the opening of the shell (1), a magnetic core tube (4) is installed in the middle of the coil portion (2), a push rod (5) is installed in the inside of the magnetic core tube (4), a tongue iron (6) is installed in the inside of the magnetic core tube (4), a fastening bolt (7) is installed on the other end of the magnetic core tube (4) through a thread, an inductive proximity switch (8) is provided on one end of the magnetic core tube (4) close to the fastening bolt (7) by riveting, an inductive surface iron core (9) is installed in the middle of the inductive proximity switch (8), the inductive proximity switch (8) includes a coil, an oscillation circuit, a trigger circuit and an amplified output short circuit, a manual push rod (10) is installed in the middle of the inductive surface iron core (9), and a reset spring (11) is sleeved on the end of the manual push rod (10) exposed to the outside.

2. The electromagnet structure according to claim 1, wherein a sensor is placed inside the electromagnetic tube to monitor the operation of the electromagnet, characterized in that: The inductive proximity switch (8) is externally connected to the detection equipment via a circuit board and a switching line.

3. The electromagnet structure according to claim 1, wherein a sensor is placed inside the electromagnetic tube to monitor the operation of the electromagnet, characterized in that: The sensing surfaces and internal cavities of the inductive proximity switch (8) and the magnetic core tube (4) are coated with epoxy resin for protection.

4. The electromagnet structure according to claim 1, wherein a sensor is placed inside the electromagnetic tube to monitor the operation of the electromagnet, characterized in that: The exteriors of the fastening bolt (7), the inductive proximity switch (8), the sensing surface iron core (9) and the manual push rod (10) are all sleeved with sealing rings.

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