CN216620989U

CN216620989U - Stroke detection sensor

Info

Publication number: CN216620989U
Application number: CN202122981029.0U
Authority: CN
Inventors: 潘明涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-05-27
Anticipated expiration: 2031-11-29

Abstract

The utility model discloses a stroke detection sensor, which comprises: the shell is provided with a containing cavity and is made of non-magnetic materials. Install in the probe unit of casing, probe unit includes pick-up plate, control panel, insulating ring, connects the electrically conductive piece of pick-up plate and control panel and encircles in at least one annular magnetic member of electrically conductive piece, and the insulating ring encircles in electrically conductive piece and be located between annular magnetic member and the pick-up plate, and the pick-up plate is towards the diapire direction of accomodating the chamber. The signal line group is electrically connected with the control panel; and the sealing colloid is molded in the accommodating cavity in a glue pouring manner so as to seal the probe assembly in the shell. The probe assembly is arranged in the shell and sealed by the sealing colloid, and the whole structure is stable and is not interfered by the outside. The probe assembly determines the moving stroke of the screw rod through the waveform change of the magnetic induction screw rod, the detection precision is high, and the required maintenance cost is low.

Description

Stroke detection sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a stroke detection sensor.

Background

The nozzle device of the existing injection molding machine is provided with a screw rod, the screw rod is used for pushing the molten raw materials to inject the molten raw materials into a mold cavity so as to quantitatively output the raw materials with the corresponding gram weight, and the required measurement precision is high and the required stability is good. In the related art, a mechanism for detecting the screw stroke is usually detected by a photoelectric sensor, however, the photoelectric sensor must be arranged outside the nozzle device, and is easily polluted by external dirt, so that the detection is failed, frequent maintenance is required, and labor cost is high, and therefore improvement is required.

Disclosure of Invention

The utility model aims to provide a stroke detection sensor.

The technical scheme adopted by the utility model is as follows: a stroke detecting sensor comprising:

a housing provided with a receiving cavity and made of a non-magnetic conductive material;

the probe assembly is arranged on the shell and comprises a detection plate, a control plate, an insulating ring, a conductive piece and at least one annular magnetic piece, wherein the conductive piece is connected with the detection plate and the control plate, the annular magnetic piece surrounds the conductive piece, the insulating ring surrounds the conductive piece and is positioned between the annular magnetic piece and the detection plate, and the detection plate faces the bottom wall direction of the containing cavity;

the signal line group is electrically connected with the control panel;

and the sealing colloid is molded in the accommodating cavity in a glue pouring manner, so that the probe assembly is sealed in the shell.

In one embodiment, the housing comprises a bottom wall, an annular wall surrounding the bottom wall, and a positioning surface arranged on the annular wall, wherein the surrounding areas of the bottom wall and the annular wall form a containing cavity, and the positioning surface is configured to be located on the plane of the outer peripheral wall of the annular wall.

In an embodiment, the casing further includes a positioning groove extending from the end surface of the annular wall to the bottom wall, and a positioning boss is arranged at the edge of the control plate and inserted into the positioning groove.

In one embodiment, the positioning grooves are configured with two positioning grooves which are in the same straight line, and the plane where the two positioning grooves are located is parallel to the positioning surface.

In an embodiment, the detection board includes an induction circuit board and an induction chip mounted on the induction circuit board, an edge of the induction circuit board is configured with a pointing surface, the induction chip faces the bottom wall, and the pointing surface is parallel to the positioning surface.

In one embodiment, the center of the induction chip coincides with the axis of the annular magnetic member.

In an embodiment, the conductive member includes a battery cell and an insulating member enclosing the battery cell, the battery cell is respectively connected to the detection board and the control board, and the annular magnetic member surrounds the insulating member.

In one embodiment, the S pole of the ring-shaped magnetic member faces the side of the detection plate.

In one embodiment, the number of the annular magnetic members is two, and the outer diameter of the annular magnetic member is smaller than or equal to the outer diameter of the detection plate.

In one embodiment, the control board comprises a control circuit board, an amplifying circuit and a processor, wherein the amplifying circuit and the processor are arranged on the control circuit board, and the processor is electrically connected with the amplifying circuit and the detection board.

After adopting the structure, compared with the prior art, the utility model has the advantages that: the probe assembly is arranged in the shell and sealed by the sealing colloid, and the whole structure is stable and is not interfered by the outside. The probe assembly determines the moving stroke of the screw rod through the waveform change of the magnetic induction screw rod, the detection precision is high, and the required maintenance cost is low.

Drawings

The utility model is further illustrated with reference to the following figures and examples:

fig. 1 is a schematic structural view of a stroke detecting sensor of the present invention.

Fig. 2 is a schematic sectional structure view of the stroke detecting sensor of the present invention.

Fig. 3 is a schematic structural view of the housing of the present invention.

FIG. 4 is a schematic structural view of the probe assembly of the present invention.

FIG. 5 is a schematic bottom view of the probe assembly of the present invention.

In the figure: a housing 10; an annular wall 11; a bottom wall 12; a positioning surface 13; a positioning groove 14; a probe assembly 20; a control board 21; a positioning boss 211; a processor 212; a detection plate 22; an induction circuit board 221; a sense die 222; a pointing surface 223; a conductive member 23; an electric core 231; an insulating member 232; an annular magnetic member 24; an insulating ring 25; a sealing gel 30; a signal line group 40.

Detailed Description

The following description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention.

In the embodiment, as shown in fig. 1 to 3, the utility model discloses a stroke detection sensor, which is applied to the industries of a plastic machine and die casting, and is used for detecting the moving stroke of an internal screw of an injection molding machine or a die casting. It is worth mentioning that the stroke detection sensor detects the stroke based on the groove structure with the height change, and is also used for the stroke detection of other application scenes.

The stroke detection sensor includes: the probe assembly comprises a shell 10 made of non-magnetic conducting materials, a probe assembly 20 mounted on the shell 10, a signal line group 40 electrically connected to the probe assembly 20, and a sealing colloid 30 which is molded on the shell 10 by pouring glue. The housing 10 is a container member formed of a thin-walled structure, which is provided with a receiving chamber. Specifically, the sealing compound 30 is filled in the receiving cavity to seal the probe assembly 20 in the housing 10. The sealing colloid 30 is filled in the accommodating cavity, so that the relative positions of the probe assembly 20 and the shell 10 can be stabilized, the influence of an external water vapor medium on the probe assembly 20 can be blocked, and the working condition is good.

The probe assembly 20 includes a sensing plate 22, a control board 21, an insulating ring 25, a conductive member 23 connecting the sensing plate 22 and the control board 21, and at least one annular magnetic member 24 surrounding the conductive member 23. The conductive member 23 is configured as a wire or a pin strip or a metal rod spaced apart from each other, and is used to connect the detection board 22 and the control board 21 so that an electrical signal is transmitted between the detection board 22 and the control board 21.

The detection plate 22 is oriented toward the bottom wall 12 of the receiving chamber, i.e., when the stroke detecting sensor is applied to the injection molding machine, the bottom wall 12 of the receiving chamber is located between the detection plate 22 and the screw. The detecting plate 22 is used for sensing the thread change on the screw rod, so as to output a corresponding waveform signal, and the waveform signal is transmitted to the control board 21 through the conductive member 23. The signal line group 40 is electrically connected to the control board 21 and extends outside the housing 10, thereby transmitting the waveform signal to the control unit of the injection molding machine. Optionally, the sensing board 22 includes a sensing circuit board 221 and a sensing chip 222 mounted on the sensing circuit board 221, the sensing chip 222 and the conductive member 23 are respectively located on two opposite surfaces of the sensing circuit board 221, wherein the sensing chip 222 faces the bottom wall 12 of the receiving cavity.

The annular magnetic member 24 is in an annular structure, and surrounds the conductive member 23 and faces the side of the sensing circuit board 221, so that the sensing chip 222 is within the magnetic field range of the annular magnetic member 24. The insulation ring 25 surrounds the conductive member 23 and is positioned between the annular magnetic member 24 and the detection plate 22, so as to space the annular magnetic member 24 and the detection plate 22, thereby improving the detection sensitivity of the detection plate 22. The probe assembly 20 determines the moving stroke of the screw rod by magnetically inducing the waveform change of the screw rod, and has high detection precision and low maintenance cost.

The first embodiment,

The housing 10 is a container structure formed by a thin-walled structural member, wherein the housing 10 includes a bottom wall 12, an annular wall 11 surrounding the bottom wall 12, and a positioning surface 13 disposed on the annular wall 11, a surrounding area of the bottom wall 12 and the annular wall 11 forms an accommodating cavity, and the positioning surface 13 is configured to be located on a plane of an outer peripheral wall of the annular wall 11. The annular wall 11 is of tubular construction such that the housing 10 is of tubular construction closed at one end. For example, the annular wall 11 is in the shape of a circular tube, a rectangular tube, or a profiled tube at least partially configured as a plane. The positioning surface 13 is disposed on the outer peripheral wall of the arc-shaped wall to form an anti-rotation structure, thereby improving the controllability of the installation direction of the stroke detection sensor and the detection direction of the mark.

The probe assembly 20 is inserted into the receiving cavity from the open end of the annular wall 11 for assembly. Optionally, the outer edge of sensing plate 22 is fitted to the inner wall of annular wall 11, and the surface of sensing circuit board 221 is parallel to bottom wall 12, so as to improve the positioning accuracy of sensing chip 222.

Example II,

As shown in fig. 2 and 4 to 5, in the first embodiment, the edge of the sensing circuit board 221 is provided with the pointing surface 223, the sensing chip 222 faces the bottom wall 12, and the pointing surface 223 is parallel to the positioning surface 13. The pointing surface 223 facilitates a user to determine the assembling direction and the detecting direction of the detecting plate 22, wherein the pointing surface 223 is parallel to the positioning surface 13, and the assembling direction of the sensing circuit board 221 can be accurately determined. Optionally, the distance of the pointing surface 223 from the positioning surface 13 is less than the distance of the center line of the detection plate 22 from the positioning surface 13. Wherein the centerline of sensing plate 22 may be defined as the axis of sensing plate 22.

Further, the center of the sensing chip 222 coincides with the axis of the annular magnetic member 24, so that the magnetic field strength of the sensing chip 222 is the same at all angles. In the moving process of the screw, the sensing chip 222 can detect the change of the waveform curve formed by the fluctuation change of each thread on the screw, so as to judge the stroke of the screw and ensure accurate detection.

Example III,

As shown in fig. 2 and 4, on the basis of the second embodiment, the annular magnetic member 24 may be configured as a circular ring structure in which the S pole of the annular magnetic member 24 faces the side of the detection plate 22, so that the detection plate 22 can generate a corresponding electrical signal when the screw moves. Alternatively, the annular magnetic members 24 are arranged in two, and the outer diameter of the annular magnetic members 24 is smaller than or equal to the outer diameter of the detection plate 22. The height size and the magnetic field intensity of the annular magnetic pieces 24 can be adjusted through the number of the annular magnetic pieces 24, and the use convenience is improved.

Examples IV,

On the basis of the above embodiment, the casing 10 further includes a positioning groove 14 extending from the end surface of the annular wall 11 toward the bottom wall 12, and the positioning groove 14 is located at the opening of the casing 10. The number of the positioning grooves 14 may be set to one or more. Alternatively, the positioning grooves 14 are configured in two and in the same straight line, and the plane where the two positioning grooves 14 are located is parallel to the positioning surface 13. The two positioning slots 14 form a plane and are in the same straight line.

Probe assembly 20 is inserted into the receiving cavity, and at least a portion of probe assembly 20 is inserted into positioning slot 14, thereby defining the insertion depth of probe assembly 20 and controlling the spacing between sensing chip 222 and bottom wall 12. Specifically, the edge of the control panel 21 is provided with a positioning boss 211, and the positioning boss 211 is inserted into the positioning groove 14. The probe assembly 20 is connected with the shell 10 through the positioning boss 211 of the control plate 21, so that the insertion depth and the angle of the probe assembly 20 are limited, and the positioning control effect is good.

Example V,

On the basis of the above embodiment, the conductive member 23 includes the battery cell 231 and the insulating member 232 housing the battery cell 231, the battery cell 231 is connected to the detection board 22 and the control board 21, respectively, and the annular magnetic member 24 surrounds the insulating member 232. The battery cell 231 is made of a metal material, and the detection board 22 and the control board 21 are connected through the battery cell 231 to transmit electrical signals, such as voltage and current signals. The insulating member 232 separates two adjacent battery cells 231 from each other, thereby avoiding mutual interference. And, the insulator 232 is located in the surrounding area of the annular magnetic member 24, and separates the annular magnetic member 24 from the battery cell 231, so that the blocking effect is good. Further, the outer peripheral wall of the insulating member 232 and the inner peripheral wall of the annular magnetic member 24 are mutually limited and positioned, so that the annular magnetic member 24 and the insulating member 232 are mutually matched, and the installation precision is improved.

Example six,

The plane of the control plate 21 intersects with the plane of the detection plate 22, for example, the plane of the control plate 21 is perpendicular to the plane of the detection plate 22. The control board 21 includes a control circuit board, an amplifying circuit disposed on the control circuit board, and a processor 212, and the processor 212 is electrically connected to the amplifying circuit and the detection board 22. The processor 212 is used for processing the detection signal output by the detection board 22, and the amplification circuit amplifies the detection signal and outputs the amplified signal through the signal line group 40. The signal line group 40 includes four signal lines to output or input corresponding electrical signals, respectively.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application. Other structures and principles are the same as those of the prior art, and are not described in detail herein.

Claims

1. A stroke detecting sensor, characterized by comprising:

the signal line group is electrically connected with the control panel;

2. The stroke detecting sensor according to claim 1, wherein the housing includes a bottom wall, an annular wall surrounding the bottom wall, and a positioning surface provided to the annular wall, a surrounding area of the bottom wall and the annular wall constituting the housing chamber, the positioning surface being configured to be located in a plane of an outer peripheral wall of the annular wall.

3. The stroke sensor according to claim 2, wherein the housing further includes a positioning groove extending from the end surface of the annular wall toward the bottom wall, and a positioning boss is provided at an edge of the control plate and inserted into the positioning groove.

4. The stroke detecting sensor according to claim 3, wherein the positioning grooves are provided in two and collinear positions, and the planes in which the two positioning grooves are located are parallel to the positioning surface.

5. The stroke detecting sensor according to claim 2, wherein the detecting plate includes a sensing circuit board and a sensing chip mounted on the sensing circuit board, an edge of the sensing circuit board is provided with a pointing surface, the sensing chip faces the bottom wall, and the pointing surface is parallel to the positioning surface.

6. The stroke detecting sensor according to claim 5, wherein a center of the sense chip coincides with an axis of the annular magnetic member.

7. The stroke detecting sensor according to claim 1, wherein the conductive member includes a cell and an insulating member accommodating the cell, the cell is connected to the detecting plate and the control board, respectively, and the annular magnetic member surrounds the insulating member.

8. The stroke detecting sensor according to claim 1, wherein an S pole of the ring-shaped magnetic member is directed toward the side of the detecting plate.

9. The stroke detecting sensor according to claim 8, wherein the annular magnetic member is arranged in two, and an outer diameter of the annular magnetic member is smaller than or equal to an outer diameter of the detecting plate.

10. The stroke detecting sensor according to claim 1, wherein the control board includes a control circuit board, an amplifying circuit provided on the control circuit board, and a processor electrically connected to the amplifying circuit and the detecting plate.