Material detection sensor

Abstract

The utility model discloses a material detection sensor which comprises a shell, one end of the shell is provided with a fixing device, and the fixing device is provided with a fixing shaft; the device further comprises a detection lever and a detection plane, the detection lever is provided with a through hole in the axial center position, the fixed shaft penetrates through the through hole, and the detection lever rotates around the fixed shaft. Two ends of the detection lever are respectively provided with a magnetic device; two coils and a control circuit are arranged in the shell; and the magnetic device, the coils and the control circuit are matched to generate an electric signal capable of identifying and detecting the movement of the lever. The device has the beneficial effects that the device can adapt to a more complex detection environment, and the detection precision is improved.

Description

Technical Field

[0001] The utility model relates to a sensor, in particular to a material detection sensor. Background Art

[0002] The material detection sensor is used to detect whether there is material in the material bin. By calibrating the movement cycle time for common materials and when there is no material, the sensor can calibrate the time to detect whether there is material in the material bin and the type of material.

[0003] The invention patent publication with publication number CN102155968A discloses an electromagnetic push-type object detection device, which includes a magnetic pendulum and an electromagnet arranged on one side of the magnetic pendulum, and an electronic module that controls the electromagnet to drive the magnetic pendulum to swing and amplifies, processes and delays the output of the signal of the magnetic pendulum swing collected by the electromagnet. The defect of the above scheme is that the setting of the magnetic pendulum has high requirements on the external environment, and the pendulum is easily entangled, accumulated and contaminated by external objects, resulting in failure to work normally or reduced working accuracy. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model proposes a material detection sensor, which can detect solid particles, powdered or liquid flowable materials. The sensor adopts electromagnetic drive to detect the movement of the lever. In different material environments, the movement of the lever will encounter different resistances, which will cause changes in the periodic motion time.

[0005] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0006] A material detection sensor comprises a housing 10, a fixing device 20 is arranged at one end of the housing 10, and a fixing shaft 21 is arranged on the fixing device 20;

[0007] The detection lever 30 and the detection plane 40 are also included. The detection lever 30 is provided with a through hole 31 at the axial center position. The fixed shaft 21 passes through the through hole 31. The detection lever 30 rotates around the fixed shaft 21. The two ends of the detection lever 30 are respectively provided with magnetic devices 32.

[0008] The housing 10 is provided with a coil 50 and a control circuit. The magnetic device 32 , the coil 50 and the control circuit cooperate to generate an electrical signal that can identify the movement of the detection lever 30 .

[0009] As a preferred solution, the magnetic devices have opposite magnetic properties.

[0010] As a preferred solution, the control circuit includes an MCU, a MOS tube driving circuit and a signal shaping amplifier circuit for control, the MOS tube driving circuit and the signal shaping amplifier circuit are respectively connected to the MCU, and the coil 50 is respectively connected to the MOS tube driving circuit and the signal shaping amplifier circuit through a switching circuit.

[0011] As a preferred solution, the signal shaping and amplifying circuit shapes and amplifies the induced voltage of the coil 50 into a level signal recognizable by the MCU IO port, and the IO port identifies the sensor detection state according to different level combinations.

[0012] As a preferred solution, the top cross section of the coil 50 and the detection plane 40 are located in the same plane.

[0013] As a preferred solution, half of the length of the detection lever 30 is greater than the vertical distance between the central axis of the fixed shaft 21 and the detection plane 40 .

[0014] As a preferred solution, one end or both ends of the fixed shaft 21 are fixed to the fixing device 20 .

[0015] As a preferred solution, the control circuit is entirely disposed in the housing 10 , and a detachable housing cover 60 is disposed on the other end of the housing 10 where the fixed shaft is disposed.

[0016] As a preferred solution, the control circuit is separated from the housing, and the control circuit is connected to the coil located in the housing through a longer wire.

[0017] As a preferred solution, the number of the coils 50 is two.

[0018] The beneficial effects of the utility model are that by setting the detection lever to rotate around a fixed axis, it can adapt to more complex detection environments and improve detection accuracy; setting two coils can improve the detection accuracy of the sensor; setting an amplifier circuit and a MOS tube drive circuit increases the fault detection function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the external structure of the first embodiment.

[0020] Figure 2 1 is a schematic diagram of the external and internal structure of the first embodiment (partial). The components shown by the dotted lines include a coil 50 disposed inside the housing and a magnetic device 32 disposed inside the detection lever.

[0021] Figure 3 It is a schematic diagram of the external structure of the second embodiment. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 1 and Figure 2 The first embodiment shown is a material detection sensor, including a housing 10. Usually, the housing 10 can be made into a hollow cylindrical shape. In some occasions as required, the housing 10 can be set to a long strip or other shapes.

[0024] A fixing device 20 is provided at one end of the housing 10. The fixing device 20 is used to set a fixing shaft 21 thereon.

[0025] It also includes a detection lever 30 and a detection plane 40. The detection lever 30 is provided with a through hole 31 at the axial center position, and the fixed shaft 21 passes through the through hole 31, so that the detection lever 30 can be supported on the fixed shaft 21, and the detection lever 30 can rotate around the fixed shaft to a certain angle. The rotatable angle here can be set according to actual needs. The specific setting method is to assume that half of the length of the detection lever 30 is L1, and the vertical distance from the central axis of the fixed shaft 21 to the detection plane 40 is L2. Then, by controlling the size relationship between L1 and L2, the rotatable angle can be achieved.

[0026] Magnetic devices 32 are provided at both ends of the detection lever 30. The two magnetic devices 32 have opposite polarities, with S on the left and N on the bottom, and N on the right and S on the bottom. The driving and detection coils 50 generate alternating magnetic fields by alternating currents of reversed directions, driving the detection lever 30 to rotate around the fixed axis 21.

[0027] Two coils 50 and a control circuit are arranged in the housing 10. The magnetic device 32, the coil 50 and the control circuit cooperate to generate an electrical signal that can identify the movement of the detection lever 30. The top section of the coil 50 is located in the same plane as the detection plane 40. The advantage of this design is that it reduces the possibility of the coil being contaminated by the material. In each cycle of the coil, the PWM pulse width is used to control the power-on time of the coil 50. After the coil 50 is powered on, the coil 50 is immediately switched to the detection circuit to detect the induced voltage generated by the magnetic device 32 cutting the coil at both ends of the detection lever 30 that continues to move due to inertia. Since the upper and lower magnetic poles of the magnetic devices 32 at the left and right ends are in opposite positions and the movement directions are opposite, it can ensure that the driving force during driving is superimposed in the same direction to increase the driving force, and the induced electromotive force during detection is superimposed in the same direction to increase the induced electromotive force. While improving the adaptability of the sensor, the detection sensitivity of the sensor is also improved.

[0028] For the present application, the control circuit includes a signal shaping and amplifying circuit, which shapes and amplifies the induced voltage of the coil 50 into a level signal recognizable by the MCU IO port, and the IO port identifies the sensor detection state according to different level combinations.

[0029] The control circuit also includes a MOS tube drive circuit. The two coils 50 can be switched to the MOS tube drive circuit and the signal shaping amplifier circuit respectively through a double-pole double-throw switch, that is, in the normal working mode and the learning mode: the two coils 50 are intelligently connected to different circuits at the same time. For example, at a certain moment, coil A is connected to the MOS tube drive circuit by the switching circuit, and coil B must be connected to the signal shaping amplifier circuit. Vice versa.

[0030] In the fault diagnosis and repair mode, the two coils can be connected to the MOS tube drive circuit at the same time.

[0031] The MOS tube is driven by a PWM port of the MCU. Different frequencies and duty cycles can provide different magnetic forces for the coil.

[0032] The control circuit is integrally arranged in the shell, and a detachable shell cover 60 is arranged on the other end of the shell where the fixed axis is arranged. When the shell 10 and the shell cover 60 are joined, the material detection sensor described in the present application forms a complete integral structure.

[0033] like Figure 3 In the second embodiment shown, the arrangement of the control circuit and the coil is the same as that of the first embodiment, except that only one end of the fixed shaft is arranged on the fixing device, and the fixing device is arranged on the detection plane, which is different from the first embodiment in that the fixing device is arranged on the shell.

[0034] In the third embodiment, the arrangement of the control circuit is the same as that of the first and second embodiments, except that only one coil 50 is provided.

[0035] In addition, considering that the sensor needs to work in a high temperature environment in some cases, which exceeds the allowable operating temperature range of the control circuit. In order to solve the above problem, in another embodiment, the control circuit and the housing can be separated, and the control circuit is connected to the coil located in the housing through a longer wire, and other solutions remain unchanged. In this way, the control circuit part can be placed outside the high temperature environment.

[0036] The working methods and steps involved in this application will be disclosed by other invention patents.

Claims

1. A material detection sensor, comprising a housing (10), characterized in that: A fixing device (20) is provided at one end of the housing (10), and a fixing shaft (21) is provided on the fixing device (20); It also includes a detection lever (30) and a detection plane (40); the detection lever (30) is provided with a through hole (31) at an axial center position, the fixed shaft (21) passes through the through hole (31), and the detection lever (30) rotates around the fixed shaft (21); and magnetic devices (32) are respectively provided at both ends of the detection lever (30); A coil (50) and a control circuit are arranged in the housing (10); the magnetic device (32), the coil (50) and the control circuit cooperate to generate an electrical signal that can identify movement of the detection lever (30).

2. A material detection sensor according to claim 1, characterized in that: The magnetic devices have opposite magnetic properties.

3. A material detection sensor according to claim 1, characterized in that: The control circuit comprises an MCU for control, a MOS tube drive circuit and a signal shaping amplifier circuit, the MOS tube drive circuit and the signal shaping amplifier circuit are respectively connected to the MCU, and the coil (50) is respectively connected to the MOS tube drive circuit and the signal shaping amplifier circuit via a switching circuit.

4. A material detection sensor according to claim 3, characterized in that: The signal shaping and amplifying circuit shapes and amplifies the induced voltage of the coil (50) into a level signal that can be recognized by the MCU IO port, and the IO port identifies the sensor detection state according to different level combinations.

5. A material detection sensor according to claim 1, characterized in that: The top cross section of the coil (50) is located in the same plane as the detection plane (40).

6. A material detection sensor according to claim 1, characterized in that: Half the length of the detection lever (30) is greater than the vertical distance between the central axis of the fixed shaft (21) and the detection plane (40).

7. A material detection sensor according to claim 1, characterized in that: One end or both ends of the fixed shaft (21) are fixed to the fixing device (20).

8. A material detection sensor according to claim 1, characterized in that: The control circuit is disposed as a whole in the housing (10), and a detachable housing cover (60) is disposed on the housing (10) at the other end where the fixed shaft is disposed.

9. A material detection sensor according to claim 1, characterized in that: The control circuit is separated from the shell, and the control circuit is connected to the coil located in the shell through a longer wire.

10. A material detection sensor according to claim 1, characterized in that: The number of the coils (50) is two.

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