An electromagnetic based inductive displacement sensor

Abstract

The utility model discloses an inductance type displacement sensor based on electromagnet, relates to displacement sensor technical field, including mounting seat and sensor body, the sensor body includes the shell body, and the inside installation of shell body has the mounting bracket, and the outer surface of mounting bracket is wound with the coil, the outer surface of mounting bracket is pasted with the shielding layer, the inside sliding of mounting bracket has the inner shell, through the movable contact pin of setting, to detect the movement of measured object, when movable contact pin drives the displacement of magnet bar, through the coil of setting makes the inductance change, to carry out transmission to displacement signal, and under the effect of shell body, mounting bracket and inner shell, the convenience of sensor body combination has been improved, and through control connection slider is in the inside of sliding groove and slides back and forth, to adjust movable contact pin of sensor body one end, need not to dismount and fix again, reaches the purpose that uses conveniently.

Description

Technical Field

[0001] This utility model relates to the field of displacement sensor technology, specifically an electromagnetic inductive displacement sensor. Background Technology

[0002] An inductive displacement sensor is a device that uses changes in the self-inductance or mutual inductance coefficient of a coil to measure displacement. Inductive displacement sensors can measure parameters such as displacement and have a series of advantages, including simple structure, high sensitivity, high output power, low output impedance, strong anti-interference ability, and high measurement accuracy. They are widely used in electromechanical control systems. Their working principle is based on electromagnetic induction. When the object being measured undergoes displacement, it causes a change in the inductance of the sensor coil. This change is then converted into voltage or current output through a measurement circuit, thereby achieving accurate displacement measurement.

[0003] Chinese Patent Publication No. CN205209459U discloses a displacement sensor mounting bracket, which includes a bracket body. The bracket body has a first fixing plate, a second fixing plate, and a bending portion. The first fixing plate and the second fixing plate are connected through the bending portion. The first fixing plate is fixedly connected to a first side of the displacement sensor.

[0004] However, the inventor of the above device believes that there are certain defects. The above device connects the sensor and the fixing frame with bolts. When the sensor needs to be adjusted, the connecting bolts need to be removed, which is time-consuming and laborious. Therefore, this utility model provides an electromagnetic inductive displacement sensor. Summary of the Invention

[0005] The purpose of this invention is to provide an electromagnetically based inductive displacement sensor to solve the problems raised in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electromagnetic inductive displacement sensor, comprising a mounting base and a sensor body, the sensor body comprising an outer shell, an inner mounting bracket installed inside the outer shell, a coil wound on the outer surface of the mounting bracket, a shielding layer attached to the outer surface of the mounting bracket, an inner shell slidably mounted inside the mounting bracket, a movable pin slidably connected to one end of the inner shell, a first connecting plate fixedly connected to the top of the movable pin, a magnetic rod fixedly connected to the top of the first connecting plate, a connecting slider fixedly connected to the outer shell, a sliding groove adapted to the connecting slider on the mounting base, and a limiting mechanism for restricting the sliding of the connecting slider on the connecting slider.

[0007] Preferably, a second connecting plate is fixedly connected to the top of the magnetic rod, a second spring is fixedly connected to the top of the second connecting plate, and a plug for sealing the inner shell is threadedly connected to the top of the inner shell. Under the action of the second spring force, the movable pin slides back quickly when it is not under force.

[0008] Preferably, a top box is fixedly connected to the top of the mounting bracket, and a circuit board is installed inside the top box.

[0009] Preferably, one end of the outer shell has a through hole for the movable ejector pin to pass through, and one end of the mounting bracket has an external thread. The mounting bracket is threaded to the inside of the outer shell. The external thread of the mounting bracket is used to install the mounting bracket inside the outer shell, and the inner shell is blocked by the inner bottom wall of the outer shell, so that the inner shell is installed inside the mounting bracket.

[0010] Preferably, the limiting mechanism includes a limiting rod that slides on the connecting slider. The top of the mounting base has a limiting hole that communicates with the sliding groove. One end of the limiting rod is inserted into the inside of the limiting hole. By inserting one end of the limiting rod into the limiting hole, the connecting slider is limited to slide inside the sliding groove, thereby fixing the position of the sensor body.

[0011] Preferably, the connecting slider has a sliding cavity, one end of the limiting rod is slidably connected to the inside of the sliding cavity, and the bottom of the limiting rod is fixedly connected to a first spring. Under the action of the first spring, one end of the limiting rod is stably inserted into the inside of the limiting hole.

[0012] Preferably, the connecting wires of the circuit board pass through the top box and extend to the outside of the outer casing, and a seal is provided between the connecting wires and the top box.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This application uses a movable pin to detect the movement of the object being measured. When the movable pin moves the magnetic rod, the inductance changes through the coil to transmit the displacement signal. The outer shell, mounting bracket, and inner shell enhance the ease of assembling the sensor body. Furthermore, by controlling the connecting slider to slide back and forth inside the sliding groove, the movable pin at one end of the sensor body can be adjusted without the need for disassembly and reassembly, thus achieving convenient use.

[0014] 2. This application uses a plug to seal one end of the inner housing. When the movable pin is not under force, the second spring will quickly drive the movable pin to slide back to its original position. By inserting one end of the limiting rod into the limiting hole, the sliding of the connecting slider on the mounting base is restricted, thereby fixing the installation position of the sensor. Attached Figure Description

[0015] Figure 1 This is a perspective view of the installation of an electromagnetic inductive displacement sensor according to this utility model. Figure 2 This is a three-dimensional view of the sensor body structure of an electromagnetic inductive displacement sensor according to this utility model. Figure 3 This is a perspective view of the mounting frame structure of an electromagnetic inductive displacement sensor according to the present invention. Figure 4 This is a three-dimensional cross-sectional view of the inner shell of an electromagnetic inductive displacement sensor according to this utility model. Figure 5 This is a sectional perspective view of the connecting slider of an electromagnetic inductive displacement sensor according to this utility model.

[0016] The following are the labeling elements in the diagram: 1. Mounting base; 11. Restriction hole; 2. Connecting slider; 21. Sliding cavity; 22. Restriction rod; 23. First spring; 3. Outer shell; 4. Mounting bracket; 5. Coil; 6. Shielding layer; 7. Inner shell; 71. Movable ejector pin; 72. First connecting plate; 73. Magnetic rod; 74. Second connecting plate; 75. Second spring; 76. Plug; 8. Top box. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 An electromagnetic inductive displacement sensor includes a mounting base 1 and a sensor body. The sensor body includes a housing 3, inside which a mounting frame 4 is installed. A coil 5 is wound around the outer surface of the mounting frame 4, and a shielding layer 6 is attached to the outer surface of the mounting frame 4. An inner housing 7 slides inside the mounting frame 4. A movable pin 71 is slidably connected to one end of the inner housing 7. A first connecting plate 72 is fixedly connected to the top of the movable pin 71, and a magnetic rod 73 is fixedly connected to the top of the first connecting plate 72. By squeezing one end of the movable pin 71 to cause displacement, the magnetic rod 73 inside the inner housing 7 is moved. The inductance of the coil 5 changes, thereby transmitting the displacement signal. Please refer to it again. Figure 1 , Figure 2 , Figure 3 and Figure 4 A second connecting plate 74 is fixedly connected to the top of the magnetic rod 73, and a second spring 75 is fixedly connected to the top of the second connecting plate 74. A plug 76 for sealing the inner housing 7 is threadedly connected to the top of the inner housing 7. When the pressure of the movable ejector pin 71 is removed, the movable ejector pin 71 is quickly slid back to its original position by the rebound of the second spring 75. The mechanism inside the inner housing 7 can be taken out by rotating the plug 76 and the compression of the second spring 75 can be adjusted by controlling the insertion depth of the plug 76.

[0019] Please refer to it again. Figure 1 , Figure 2 , Figure 3 and Figure 4 One end of the outer casing 3 has a through hole for the movable ejector pin 71 to pass through. One end of the mounting bracket 4 has an external thread. One end of the mounting bracket 4 is threaded to the inside of the outer casing 3. The inner casing 7 is restricted from being removed from the inside of the mounting bracket 4 by the end of the outer casing 3 with the through hole. Under the action of the external thread, the mounting bracket 4 and the inner casing 7 are quickly installed inside the outer casing 3. The top of the mounting bracket 4 is fixedly connected to the top box 8. A circuit board is installed inside the top box 8. The connecting wires of the circuit board pass through the top box 8 and extend to the outside of the outer casing 3. A seal is provided between the connecting wires and the top box 8. When the inductance changes, it is converted into an electrical signal by the circuit board inside the top box 8 and transmitted through the connecting wires.

[0020] Please refer to it again. Figure 1 and Figure 5 A connecting slider 2 is fixedly connected to the outer shell 3. A sliding groove adapted to the connecting slider 2 is provided on the mounting base 1. The mounting base 1 is fixed in the required position by fasteners. Then, the connecting slider 2 is inserted into the position of the sliding groove to install the outer shell 3 on the mounting base 1. Both the sliding groove and the connecting slider 2 are T-shaped.

[0021] Please refer to it again. Figure 1 and Figure 5The connecting slider 2 is provided with a limiting mechanism to restrict the sliding of the connecting slider 2. The limiting mechanism includes a limiting rod 22 that slides on the connecting slider 2. The top of the mounting base 1 is provided with a limiting hole 11 that communicates with the sliding groove. One end of the limiting rod 22 is inserted into the inside of the limiting hole 11. By inserting the limiting rod 22 into the inside of the limiting hole 11, the sliding of the connecting slider 2 in the sliding groove is restricted. The connecting slider 2 is provided with a sliding cavity 21. One end of the limiting rod 22 is slidably connected to the inside of the sliding cavity 21. The bottom of the limiting rod 22 is fixedly connected to a first spring 23. Under the action of the elastic force of the first spring 23, one end of the limiting rod 22 is stably inserted into the inside of the limiting hole 11. The limiting rod 22 can be pushed out from the inside of the limiting hole 11 by manually pressing.

[0022] Working principle: The mounting base 1 is installed in a suitable position with fasteners, so that the connecting slider 2 on the sensor is inserted into the sliding groove to install the sensor on the mounting base 1. By controlling the sliding of the connecting slider 2 inside the sliding groove, the installation position of the movable pin 71 at one end of the sensor is adjusted. The sliding of the connecting slider 2 inside the sliding groove is restricted by the insertion of the limiting rod 22 into the limiting hole 11, thus completing the installation and fixation of the sensor. When the measured object is displaced, the movable pin 71 pushes the magnetic rod 73 to move inside the inner housing 7, causing a change in inductance. This change is converted into an electrical signal by the circuit board inside the top box 8 and finally transmitted through the connecting wire.

[0023] It will be apparent to those skilled in the art that this invention is not 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 essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An electromagnetically based inductive displacement sensor, characterized in that: The sensor body includes a mounting base (1) and a sensor body. The sensor body includes an outer shell (3). A mounting bracket (4) is installed inside the outer shell (3). A coil (5) is wound on the outer surface of the mounting bracket (4). A shielding layer (6) is attached to the outer surface of the mounting bracket (4). An inner shell (7) slides inside the mounting bracket (4). A movable pin (71) is slidably connected to one end of the inner shell (7). A first connecting plate (72) is fixedly connected to the top of the movable pin (71). A magnetic rod (73) is fixedly connected to the top of the first connecting plate (72). A connecting slider (2) is fixedly connected to the outer shell (3). A sliding groove adapted to the connecting slider (2) is provided on the mounting base (1). A limiting mechanism restricting the sliding of the connecting slider (2) is provided on the connecting slider (2).

2. The electromagnetic-based inductive displacement sensor according to claim 1, characterized in that: The top of the magnetic rod (73) is fixedly connected to a second connecting plate (74), the top of the second connecting plate (74) is fixedly connected to a second spring (75), and the top of the inner shell (7) is threadedly connected to a plug (76) for sealing the inner shell (7).

3. The electromagnetic-based inductive displacement sensor according to claim 1, characterized in that: The top of the mounting bracket (4) is fixedly connected to a top box (8), and a circuit board is installed inside the top box (8).

4. The electromagnetic-based inductive displacement sensor according to claim 1, characterized in that: One end of the outer shell (3) is provided with a through hole for the movable ejector pin (71) to pass through, and one end of the mounting bracket (4) is provided with an external thread. One end of the mounting bracket (4) is threadedly connected to the inside of the outer shell (3).

5. The electromagnetic-based inductive displacement sensor according to claim 1, characterized in that: The limiting mechanism includes a limiting rod (22) that slides on the connecting slider (2). The top of the mounting base (1) is provided with a limiting hole (11) that communicates with the sliding groove. One end of the limiting rod (22) is inserted into the inside of the limiting hole (11).

6. The electromagnetic-based inductive displacement sensor according to claim 5, characterized in that: The connecting slider (2) has a sliding cavity (21), one end of the limiting rod (22) is slidably connected inside the sliding cavity (21), and the bottom of the limiting rod (22) is fixedly connected to a first spring (23).

7. The electromagnetic-based inductive displacement sensor according to claim 3, characterized in that: The connecting wires of the circuit board pass through the top box (8) and extend to the outside of the outer shell (3), and a seal is provided between the connecting wires and the top box (8).

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