CN204124439U - An induction device for detecting magnetically conductive metal and a deoxidizer detection machine for its application - Google Patents

Abstract

The utility model relates to a survey induction system of magnetic conduction metal. The sensor comprises a shell, a magnet and a sensor arranged in the shell, the sensor for detecting the magnetic conduction metal further comprises a movable block, the magnet is arranged on the movable block, a movable space is arranged on the shell, the movable block is arranged in the movable space, the sensor is positioned below the movable space to sense the jump of the movable block, when the magnetic conduction metal is arranged above the movable block, the magnetic conduction metal attracts the magnet in the movable block to enable the movable block to jump, and at the moment, the sensor outputs a switching value signal. The induction device is high in stability and reliable in detection, and can accurately detect the magnetic conductive metal. The utility model also provides an use above-mentioned induction system's of surveying magnetic conduction metal deoxidier to detect machine, this deoxidier detect machine can accurately detect out the condition that is equipped with the deoxidier in the packing food, not only can detect the condition of no deoxidier in the packing food, can also be to containing whether the deoxidier in the packing food of deoxidier is effectively detecting.

Description

An induction device for detecting magnetically conductive metal and a deoxidizer detection machine for its application

Technical field:

The utility model relates to an induction device for detecting magnetically conductive metal and a deoxidizer detecting machine applied thereto.

Background technique

As a new material for food preservation, deoxidizer has its unique advantages and is widely used in the food industry. The deoxidizer and the food are packed in the same packaging bag, which absorbs the oxygen in the packaging bag, making the container anaerobic, and the food can be preserved. Deoxidizers generally use reduced iron powder as the basic raw material, and are used in food bags that generally need to be kept fresh to maintain food quality and extend shelf life.

After packing the food in the packaging bag, in order to detect whether the deoxidizer has been put into the packaged food bag, the detection method currently used is generally that the food production personnel visually observe each packaging bag, and then put the deoxidizer into the package. The bag is pulled out. This detection method is not only inefficient, but also prone to errors due to eye fatigue transition caused by long-time detection.

Now, the mechanical automatic deoxidizer detection machine that has appeared on the market, such as the utility model patent named "a deoxidizer detection machine in a packaged food bag" (patent No. ZL201120283407.1) authorized by the applicant, adopts a dedicated Magnetic metal detectors, such as electromagnetic induction magnetic metal detectors, use a coil with alternating current to generate a rapidly changing magnetic field, which can be induced inside a magnetic metal object. Eddy current, eddy current will generate a magnetic field, which in turn affects the original magnetic field, so as to detect whether there is a magnetic metal detector. This magnetic metal detector has a complex structure, with a dedicated sensor, microprocessor MCU, display screen and control. Circuit boards, with many parts and high cost, are difficult to promote and apply on a large scale in the market;

In response to the above problems, the applicant filed a utility model patent application titled "An induction device for detecting magnetically conductive metals and a food deoxidizer detector for its application" on April 2, 2013 (see Chinese Utility Model Patent Specification CN203204170U) and A utility model patent application titled "a detector for detecting whether deoxidizers are contained in packaged food" (see Chinese Utility Model Patent Specification CN203199275U), this kind of induction device for detecting magnetically conductive metal, the induction device has a simple structure and can accurately It detects magnetically permeable metals, is easy to manufacture, and has low manufacturing costs, but it is not stable enough when applied to a deoxidizer detector, and further improvement is still needed.

Contents of the invention

The main purpose of the utility model is to provide an induction device for detecting magnetically conductive metal. The sensing device has a simple structure, high stability, reliable detection, can accurately detect magnetically conductive metal, is easy to manufacture, and has low manufacturing cost.

The above-mentioned purpose is achieved through the following technical solutions:

An induction device for detecting magnetically permeable metal, comprising a casing, a magnet and a sensor installed in the casing, characterized in that: the induction device for detecting magnetically conductive metal also includes a movable block, the magnet is installed on the movable block, and the casing is There is an activity space, the activity block is placed in the activity space, the sensor is located below the activity space to sense the jump of the activity block, when there is a magnetic metal on the top of the activity block, the magnetic metal attracts the magnet in the activity block to make the activity block Jumping, at this time, the sensor outputs a switch signal.

The above technical scheme can be further improved through the following measures:

The above-mentioned movable space is a strip-shaped long groove, and the movable block is strip-shaped. The number of magnets installed on the movable block is one or more. Font arrangement.

There are two sensors, each of which is close to one end of the movable block, and the output terminals of the two sensors are connected in parallel.

The number of magnets installed on the movable block is four, including two larger magnets and two smaller magnets, and the two larger magnets are arranged adjacent to each other and installed in the middle of the movable block. The two less bulky magnets are separated by two larger volume magnets and are respectively near the ends of the movable mass.

A lightening hole is dug at both ends of the above-mentioned movable block, and four magnets are arranged between the two lightening holes.

The above-mentioned one activity space is a long slot, one movable block, one or more magnets and two sensors to form a set of detection units. Two sets of detection units are arranged on the shell, and the two sets of detection units are arranged in parallel and spaced apart.

The above sensors are proximity switches or micro switches or photoelectric switches, and the output terminals of the four sensors in the two sets of detection units are connected in parallel.

One of the above technical solutions can be selected for use, or used in any combination.

An induction device for detecting magnetically conductive metals of the utility model has the following advantages:

(1) The induction device for detecting magnetically conductive metals includes a housing, a magnet and a sensor installed in the housing, and also includes a movable block on which the magnet is installed. In the space, the sensor is located below the activity space to sense the jump of the movable block. When there is a magnetically conductive metal above the movable block, the magnetically conductive metal attracts the magnet in the movable block to make the movable block jump. At this time, the sensor outputs a switching signal , the induction device is simple in structure, high in stability, reliable in detection, capable of accurately detecting magnetically conductive metals, easy to manufacture, and low in manufacturing cost;

(2) The above-mentioned movable space is a strip-shaped long groove, and the movable block is in the shape of a strip. The number of magnets installed on the movable block is one or more. When the number of magnets is more than one, multiple magnets will The direction is arranged in a straight line, and one or more magnets are installed on the same movable block, and there is no need to wrap each magnet with a magnetic isolation material. The structure is simpler and the implementation is more convenient. As long as the magnetic metal attracts any magnet to make it move The block jumps, and the sensor, that is, the sensing device, can output a switching signal;

(3) There are two above-mentioned sensors, and each sensor is close to one end of the movable block respectively, and the output ends of the two sensors are connected in parallel, no matter whether the whole block of the movable block jumps or one of its ends jumps, it can be detected by at least one of the sensors. Sensing, since the output terminals of the two sensors are connected in parallel, as long as any sensor senses the moving block, it can output the switching signal, which has very high accuracy, high stability and reliable detection;

(4) The quantity of the above-mentioned magnets installed on the movable block is four, including two larger magnets and two smaller magnets, and the two larger magnets are adjacently arranged and installed on the movable block In the middle of the center, two magnets with smaller volumes are separated by two magnets with larger volumes and are respectively close to the end of the movable block. The number of magnets is appropriate, two with larger volume and two with smaller volume, which can properly reduce the entire movable block The weight makes it more sensitive to react with magnetically conductive metal, improve accuracy, high stability, and reliable detection;

(5) A lightening hole is dug at both ends of the above-mentioned movable block, and four magnets are arranged between the two lightening holes, which can further reduce the weight of the whole movable block;

(6) The above-mentioned one activity space is a long groove, one movable block, one or more magnets and two sensors to form a set of detection units, two sets of detection units are arranged on the housing, and the two sets of detection units are arranged in parallel and spaced apart, The magnetically conductive metal passes through two sets of detection units successively. As long as the movable block of any set of detection units jumps, the induction device can output a switching signal, which makes the detection more accurate, the detection area is wider, the accuracy is improved, the stability is high, and the detection reliable;

(7) The above sensors are proximity switches or micro switches or photoelectric switches. The output terminals of the four sensors in the two sets of detection units are connected in parallel. The purchase cost of proximity switches or micro switches or photoelectric switches can be greatly reduced. The manufacturing cost of the sensing device, specifically, the proximity switch or the micro switch or the photoelectric switch will be turned on (or turned off) to output a switch signal.

Another object of the present utility model is to provide a deoxidizer detection machine using the above induction device for detecting magnetically conductive metals. In the case of no deoxidizer, it can also detect whether the deoxidizer in the packaged food containing deoxidizer is effective, high stability, reliable detection, not easy to make mistakes, automatic detection, high efficiency, low labor intensity, and simple structure , low manufacturing cost.

The above-mentioned purpose is achieved through the following technical solutions:

A deoxidizer detection machine, including a frame, a first conveying device and an induction device for detecting the presence of deoxidizer in packaged food, the first conveying device and the induction device are installed on the frame, the first conveying device Including an input end and an output end, the first conveying device can transport the packaged food from the input end to the output end, and the sensing device is located between the input end and the output end of the first conveying device, and is characterized in that: the sensing device It is the above-mentioned induction device for detecting magnetically permeable metal.

The above technical scheme can be further improved through the following measures:

The frame is also equipped with a material sensor that can detect whether there is packaged food passing by and a clearing mechanism that can eject the packaged food without deoxidizer from the first conveying device; the packaged food transported by the first conveying device is sequentially passed by the material sensor , Sensing device detection; when the material sensor detects that the packaged food passes by, the trigger signal is sent to the timing switch controller set on the rack, and the timer that triggers the timing switch controller starts timing, and the timer presets a timing value T; the clearing mechanism has a static waiting state and a clearing action state, and the timing switch controller controls the clearing mechanism to switch between the static waiting state and the clearing action state; When the deoxidizer is sufficient to attract the magnet in the movable block to make the movable block jump, the sensing device outputs a switching signal to the timing switch controller; within T time, if the sensing device outputs a switching signal to the timing switch controller, the timing switch control The timer switch controller controls the clearing mechanism to be in a static waiting state, otherwise, the timing switch controller controls the clearing mechanism to be in a clearing action state.

The induction device includes a housing, a magnet, a sensor installed in the housing and a movable block, the magnet is installed on the movable block, an active space is provided on the housing, the movable block is placed in the active space, and the sensor is located below the active space to sense For the beating of the movable block, when there is deoxidizer enough to attract the magnet in the movable block to make the movable block jump, the sensor outputs a switch signal; the movable space is a strip-shaped long groove, and the movable block is strip-shaped The number of magnets on the movable block is one or more. When the number of magnets is more than one, a plurality of magnets are arranged in a line along the length direction of the movable block; there are two sensors, and each sensor is close to the movable block. One end of one end; an activity space is a long slot, a movable block, one or more magnets and two sensors to form a set of detection units, two sets of detection units are arranged on the housing, and the two sets of detection units are arranged in parallel and spaced apart , the output ends of the four sensors of the two sets of detection units are connected in parallel; the first conveying device includes a conveyor belt, the sensing device is installed under the conveyor belt, and the sensing device is installed on the conveyor belt from the input end to the output end It is used to transport the bottom of a section of the packaged food bag to be detected. The length direction of the movable block of the induction device is perpendicular to the conveying direction of the first conveying device; The deoxidizer packaged food is ejected; the deoxidizer detector also includes a second conveying device, the output end of the second conveying device is connected with the input end of the first conveying device.

The above technical solutions can be used in one of the following options, or in any combination.

The utility model application of the above-mentioned a kind of deoxidizer detecting machine for detecting the induction device of magnetically conductive metal has the following advantages:

(1) The deoxidizer detector can accurately detect the presence of deoxidizer in the packaged food bag, not only can detect the absence of deoxidizer in the packaged food bag, but also detect the deoxidizer in the packaged food containing deoxidizer Whether it is effective to detect, because the reduced iron powder in the deoxidizer that has failed has been oxidized into iron oxide powder, and the magnetic permeability of iron oxide powder is lower than that of reduced iron powder, which is not enough to attract the magnet on the movable block to make the movable block jump, so it fails The deoxidizer or no deoxidizer can not attract the movable block to jump, and the sensing device has no switch signal output, so as to judge the situation of the deoxidizer in the packaged food, and it is not easy to make mistakes, has high stability, reliable detection, automatic detection, and high efficiency. High, low labor intensity, simple structure, low manufacturing cost;

(2) During the detection process, the packaged food passes through two sets of detection units successively. As long as the movable block of any set of detection units jumps, the sensing device can output a switching signal, which makes the detection more accurate, the detection area is wider, and the accuracy is improved. , high stability, reliable detection;

(3) The removal mechanism includes a cylinder. When the piston rod of the cylinder is stretched out, the packaged food without deoxidizer can be ejected. The packaged food without deoxidizer or the packaged food containing invalid deoxidizer can be ejected by the cylinder, and the control is more accurate. The structure is simpler;

(4) The deoxidizer detection machine also includes a second conveying device, the output end of the second conveying device is connected with the input end of the first conveying device, and the packaged food to be detected is first put into the second conveying device and passed by the second conveying device. The conveying device is transported to the first conveying device, and the structural design is reasonable to facilitate the conveying of packaged food. The first conveying device can be arranged horizontally, while the second conveying device can have a certain inclination angle relative to the horizontal plane.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the induction device of the present utility model;

Fig. 2 and Fig. 3 are three-dimensional exploded schematic diagrams of two different angles of the sensing device of the present invention;

Fig. 4 is the top view of the sensing device of the present invention;

Fig. 5 is A-A sectional view of Fig. 4;

Fig. 6 is an exploded schematic diagram of a movable block of the present invention and four magnets installed on the movable block;

Fig. 7 is the schematic diagram of the three-dimensional structure of the deoxidizer detection machine of the present invention;

Fig. 8 is the top view of the deoxidizer detection machine of the present invention;

Fig. 9 is a B-B sectional view of Fig. 8;

Fig. 10 is a D-D sectional view of Fig. 9;

Fig. 11 is a partially enlarged view of part C of Fig. 9;

Fig. 12 is a partial enlarged view of part E of Fig. 10;

Fig. 13 is a control schematic diagram of the deoxidizer detector of the present invention.

Marks in the figure: 1 shell, 11 activity space; 2 magnet, 21 larger magnet, 22 smaller magnet; 3 sensor; 4 movable block, 41 lightening hole; 5 frame, 51 installation platform, 52 touch screen Type controller; 6 first conveying device, 61 input end of the first conveying device, 62 output end of the first conveying device; 7 cylinder, piston rod of 71 cylinder; 8 second conveying device.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

An induction device for detecting magnetically conductive metal as shown in Figures 1 to 6 includes a housing 1, a magnet 2 and a sensor 3 installed in the housing, the sensing device for detecting magnetically conductive metal also includes a movable block 4, a magnet 2 is installed on the movable block 4, the housing 1 is provided with an active space 11, the active block 4 is placed in the active space 11, the sensor 3 is located under the active space 11 to sense the beating of the active block 4, when the upper part of the active block 4 When there is a magnetically conductive metal, the magnetically conductive metal attracts the magnet 2 in the movable block and makes the movable block 4 jump. At this time, the sensor 3 outputs a switch signal.

The movable space 11 is a strip-shaped long groove, and the movable block 4 is strip-shaped. The number of magnets 2 installed on the movable block is one or more. 4 are arranged in a straight line in the length direction. When the number of magnets 2 is one, the magnets 2 can be bar magnets and arranged parallel to the active space 11; when the number of magnets 2 is more than one, each magnet 2 can be circular or polygonal.

There are two sensors 3, each sensor 3 is close to one end of the movable block 4, and the output terminals of the two sensors 3 are connected in parallel.

In the illustrated embodiment, the number of magnets 2 installed on the movable block is four, including two larger magnets 21 and two smaller magnets 22, and the two larger magnets 21 are adjacent to each other. Arranged and installed in the middle of the movable block 4 , the two smaller magnets 22 are separated by two larger magnets 21 and are respectively close to the ends of the movable block 4 .

A lightening hole 41 is dug at both ends of the movable block 4 , and four magnets 2 are arranged between the two lightening holes 41 .

A moving space 11 is a long slot, a moving block 4, one or more magnets 2 and two sensors 3 to form a set of detection units, the casing 1 is provided with two sets of detection units, and the two sets of detection units are arranged in parallel and spaced apart .

The sensor 3 is a proximity switch or a micro switch or a photoelectric switch, and the output terminals of the four sensors 3 in the two detection units are connected in parallel.

As shown in Figures 7 to 13, a deoxidizer detection machine includes a frame 5, a first conveying device 6 and an induction device for detecting the presence of deoxidizer in packaged food (not shown in the figure), the first A conveying device 6 and an induction device are installed on the frame 5, the first conveying device 6 includes an input end 61 and an output end 62, and the first conveying device 6 can move the packaged food from the input end 61 to the output end 62 For transportation, the induction device is located between the input end 61 and the output end 62 of the first conveying device, and the induction device is an induction device for detecting magnetically permeable metal as shown in FIGS. 1 to 6 .

The frame 5 is also equipped with a material sensor that can detect whether there is packaged food passing through and a clearing mechanism that can eject the packaged food without deoxidizer to the first conveying device 6; A mounting table 51 is provided above the device, and the mounting table 51 is close to the output end 61 of the first conveying device. The material sensor is installed on the mounting table 51. Along the conveying direction of the first conveying device, the cleaning mechanism is arranged on the material sensor. At the rear, the position of the induction device arrangement should be that the material sensor first checks that the packaged food passes through and then is checked by the induction device; the frame is also provided with a touch screen controller 52 .

The packaged food transported by the first conveying device 6 is sequentially detected by the material sensor and the sensing device;

When the material sensor detects that the packaged food passes by, the trigger signal is sent to the timing switch controller arranged on the frame 5, and the timer that triggers the timing switch controller starts timing, and the timer presets a timing value T; timing The preset timing value T of the timer can be adjusted and determined according to the conveying speed of the first conveying device and the distance from the material sensor to the clearing mechanism. Of course, the timing value T of the timer can be adjusted by the user in the timing switch controller. Knob setting, such as T=0.1s, 0.15s, 0.2s, 0.25s...;

The clearing mechanism has a static waiting state and a clearing action state, and the timing switch controller controls the clearing mechanism to switch between the static waiting state and the clearing action state;

When there is packaged food passing above the induction device, and the packaged food is equipped with a deoxidizer sufficient to attract the magnet 2 in the movable block to make the movable block 4 jump, the induction device outputs a switching signal to the timing switch controller;

Within T time, if the sensing device outputs a switch signal to the timing switch controller, the timing switch controller controls the clearing mechanism to be in a static waiting state; otherwise, the timing switch controller controls the clearing mechanism to be in a clearing action state.

The induction device includes a housing 1, a magnet 2, a sensor 3 installed in the housing 1, and a movable block 4, the magnet 2 is installed on the movable block 4, the housing 1 is provided with an active space 11, and the movable block 4 is placed on the movable block. In the space 11, the sensor 3 is located below the movable space 11 to sense the beating of the movable block 4. When there is enough deoxidizer above the movable block 4 to attract the magnet in the movable block to make the movable block 4 jump, the sensor outputs a switch signal ; The movable space 11 is a strip-shaped long groove, the movable block 4 is strip-shaped, and the quantity of the magnet 2 installed on the movable block is one or more, and when the quantity of the magnet 2 is more than one, a plurality of magnets 2 move along the The length direction of the block 4 is arranged in a straight line; there are two sensors 3, and each sensor 3 is close to an end of the movable block 4; an active space 11 is a long slot, a movable block 4, and one or more magnets 2 and two sensors 3 form a set of detection units, housing 1 is provided with two sets of detection units, the two sets of detection units are arranged in parallel and spaced apart, and the output ends of the four sensors 3 of the two sets of detection units are connected in parallel;

The first conveying device 6 comprises a conveyor belt, the sensing device is installed under the conveyor belt, and the sensing device is installed under a section of the conveyor belt from the input end to the output end for transporting the packaged food bag to be detected, the sensing device The length direction of the movable block 4 of the device is perpendicular to the conveying direction of the first conveying device 6, that is, the arrangement direction of the four magnets is perpendicular to the conveying direction of the conveying device;

The removal mechanism includes a cylinder 7, and the packaged food without deoxidizer can be ejected when the piston rod 71 of the cylinder is stretched out;

The deoxidizer detector also includes a second conveying device 8, the output end of the second conveying device 8 is connected to the input end 61 of the first conveying device.

On the frame 1, a side opposite to the removal mechanism is provided with a waste product chamber (not shown) for placing packaged foods containing expired deoxidizer or no deoxidizer ejected by the removal mechanism.

The working principle of the utility model detection machine is as follows:

First put the packaged food to be tested into the second conveying device, the packaged food is transported by the second conveying device to the input end 61 of the first conveying device, and then transported by the first conveying device, wherein the packaged food to be detected contains deoxygenated The condition of deoxidizer is divided into three situations: normal deoxidizer, invalid deoxidizer and no deoxidizer;

When the packaged food to be detected is transported by the first conveying device and passes the material sensor, the material sensor detects that packaged food passes by, and then sends a trigger signal to the timing switch controller, triggering the timer of the timing switch controller to start timing, and the timing value for T;

During T time, when the packaged food to be detected passes through the induction device for detecting magnetically conductive metal, it can be divided into the following two situations:

(1) The first case: the packaged food to be tested contains normal deoxidizer. At this time, when the packaged food passes through the sensor device, it passes through two sets of detection units of the sensor device. The normal deoxidizer contains enough reduced iron. The powder is enough to attract the beating of the movable block of any set of detection sheets, the sensing device will output a switch signal, and send the switch signal to the timing switch controller, the timer of the timing switch controller stops timing and resets, and the timing switch The controller controls the removal mechanism to be in a static waiting state, the cylinder does not act, and the packaged food containing the normal deoxidizer continues to be output from the output end 62 by the first conveying device;

(2) The second case: the packaged food to be detected contains an invalid deoxidizer or no deoxidizer. The expired deoxidizer does not have enough magnetic metal to attract the jumping of the movable block of any set of detection sheets. Therefore, the movable block does not jump, and the four sensors of the induction device have no switching signal output, and the timing switch controller controls the clearing mechanism. In the action clearing state, that is, the cylinder operates, and the piston rod of the cylinder hits the packaged food containing the deoxidizer or no deoxidizer, so that the packaged food pops off the conveyor belt, and the cylinder resets.

Claims (10)

1. An inductive device for detecting magnetically conductive metals, comprising a housing (1), a magnet (2) and a sensor (3) installed in the housing, characterized in that: the inductive device for detecting magnetically conductive metals also includes a movable block (4), the magnet (2) is installed on the movable block (4), the housing (1) is provided with the movable space (11), the movable block (4) is placed in the movable space (11), and the sensor (3) is located at The bottom of the movable space (11) is to sense the jump of the movable block (4), when the top of the movable block (4) has a magnetic conductive metal, the magnetic conductive metal attracts the magnet (2) in the movable block to make the movable (4) block Jumping, at this moment, the sensor (3) outputs a switch value signal. the 2. An induction device for detecting magnetically conductive metals according to claim 1, characterized in that: the movable space (11) is a strip-shaped long groove, the movable block (4) is strip-shaped, and the The number of magnets (2) is one or more than one, and when the number of magnets (2) is more than one, the plurality of magnets (2) are arranged in a line along the length direction of the movable block (4). the 3. A kind of sensing device for detecting magnetically conductive metal according to claim 2, characterized in that: there are two sensors (3), each sensor (3) is close to an end of the movable block (4) respectively, two The output ends of the sensors (3) are connected in parallel. the 4. The induction device for detecting magnetically permeable metal according to claim 3, characterized in that: the number of magnets (2) installed on the movable block is four, including two larger magnets (21 ) and two smaller magnets (22), two larger magnets (21) are adjacently arranged and installed in the middle of the movable block (4), and the two smaller magnets (22) are surrounded by two The larger magnets (21) are separated and respectively close to the ends of the movable block (4). the 5. An induction device for detecting magnetically permeable metals according to claim 4, characterized in that: a relief hole (41) is dug at both ends of the movable block (4), and four magnets (2) are arranged Between the two lightening holes (41). the 6. An induction device for detecting magnetically permeable metals according to claim 3, 4 or 5, characterized in that: a moving space (11) is a long slot, a moving block (4), one or more magnets (2) and two sensors (3) form a set of detection units, and the casing (1) is provided with two sets of detection units, and the two sets of detection units are arranged in parallel and spaced apart. the 7. An induction device for detecting magnetically conductive metal according to claim 6, characterized in that: the sensor (3) is a proximity switch or a micro switch or a photoelectric switch, and the four sensors (3) in the two sets of detection units The outputs are connected in parallel. the 8. A deoxidizer detection machine, comprising a frame (5), a first delivery device (6) and an induction device for detecting the presence of a deoxidizer in packaged food, the first delivery device (6) and the induction device are both Installed on the frame (5), the first conveying device (6) includes an input end (61) and an output end (62), and the first conveying device (6) can transfer packaged food from its input end (61) to The output end (62) direction is transported, and the induction device is located between the input end (61) and the output end (62) of the first conveying device, and it is characterized in that: the induction device is claimed in any one of claims 1 to 7 An induction device for detecting magnetically permeable metal is described. the 9. A deoxidizer detector according to claim 8, characterized in that: The frame (5) is also equipped with a material sensor that can detect whether there is packaged food passing by and a removal mechanism that can eject the packaged food without deoxidizer from the first conveying device (6); The packaged food transported by the first conveying device (6) is sequentially detected by the material sensor and the sensing device; When the material sensor detects that the packaged food passes by, the trigger signal is sent to the timing switch controller arranged on the frame (5), and the timer that triggers the timing switch controller starts counting, and the timer presets a timing value T ; The clearing mechanism has a static waiting state and a clearing action state, and the timing switch controller controls the clearing mechanism to switch between the static waiting state and the clearing action state; When there is packaged food passing above the sensing device, and the packaged food is equipped with a deoxidizer sufficient to attract the magnet (2) in the movable block to make the movable block (4) jump, the sensing device outputs a switching signal to the timing switch controller; Within T time, if the sensing device outputs a switch signal to the timing switch controller, the timing switch controller controls the clearing mechanism to be in a static waiting state; otherwise, the timing switch controller controls the clearing mechanism to be in a clearing action state. the 10. A deoxidizer detector according to claim 9, characterized in that: The induction device includes a housing (1), a magnet (2), a sensor (3) installed in the housing (1) and a movable block (4), the magnet (2) is installed on the movable block (4), and the housing (1) is provided with activity space (11), and activity block (4) is placed in activity space (11), and sensor (3) is positioned at the bottom of activity space (11) to sense the beating of activity block (4), when activity When the top of the block (4) has sufficient deoxidizer to attract the magnet in the movable block to make the movable block (4) jump, the sensor outputs a switch signal; the movable space (11) is a strip-shaped long groove, and the movable block (4) It is strip-shaped, and the number of magnets (2) installed on the movable block is one or more. When the number of magnets (2) is more than one, the plurality of magnets (2) are arranged along the length direction of the movable block (4). Arranged in a straight line; there are two sensors (3), and each sensor (3) is close to an end of the movable block (4) respectively; a movable space (11) is a long groove, a movable block (4), a Or more than one magnet (2) and two sensors (3) form a set of detection units, and the housing (1) is provided with two sets of detection units, the two sets of detection units are arranged in parallel and spaced apart, and the four sensors of the two sets of detection units (3) The output terminals are connected in parallel; The first conveying device (6) includes a conveyor belt, the induction device is installed under the conveyor belt, and the induction device is installed under a section of the conveyor belt from the input end to the output end for transporting the packaged food bags to be detected, The length direction of the movable block (4) of the induction device is perpendicular to the conveying direction of the first conveying device (6); The removal mechanism includes a cylinder (7), and the packaged food without deoxidizer can be ejected when the piston rod (71) of the cylinder is stretched out; The deoxidizer detector also includes a second conveying device (8), the output end of the second conveying device (8) is connected with the input end (61) of the first conveying device. the