Grating type infrared object detection sensor

Abstract

The utility model discloses a grating type infrared object detection sensor which comprises an inner cylinder, an outer shell connected to an inner rib located at an opening of the inner cylinder through a buckle assembly, a first PCB arranged in an inner cavity of an outer shell body located at the left side of the inner cylinder, an infrared transmitting tube arranged on the first PCB, and a second PCB arranged in an inner cavity of the outer shell body located at the right side of the inner cylinder. And an infrared receiving tube is arranged on the second PCB. According to the utility model, the infrared receiving tubes and the infrared transmitting tubes are in one-to-one correspondence to form infrared geminate transistors, and the infrared geminate transistors are detachably connected to the two sides of the inner cylinder, so that the situation that the inner cylinder and the refrigerator chassis are deformed due to small fit clearance allowance of the inner cylinder and the refrigerator chassis and the sensor fails like a weighing sensor is avoided; and infrared scanning type detection is performed on the inner cylinder through the infrared geminate transistors, so that whether the inner cylinder is filled with articles or not can be recognized in all directions, and misjudgment caused when the sensor recognizes light articles or the articles are far away from the center of the contact surface of the sensor due to inclination of the vehicle-mounted refrigerator is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to infrared sensor technical field, concretely relates to a grating type infrared object detection sensor. BACKGROUND

[0002] With the popularity of new energy vehicles, intelligent vehicle-mounted products are constantly upgraded, and intelligent vehicle-mounted refrigerators will become standard equipment. For vehicle-mounted refrigerators, it is necessary to consider whether there are objects inside, so as to judge whether the vehicle-mounted refrigerator needs to be started, so as to achieve the effect of energy saving and increasing the use time of the battery. Usually, a weighing sensor is used to detect whether there are objects stored in the vehicle-mounted refrigerator, but the weighing sensor needs the refrigerator chassis and the inner cylinder to be separated. If the gap between the two is small, the chassis and the inner cylinder will deform, and the weighing sensor will fail. Moreover, the weighing sensor will misjudge the lighter objects, and when the car is parked on a slope, the weighing sensor will also misjudge. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies of the prior art, the utility model provides a grating type infrared object detection sensor, which uses infrared light transmission and reception to detect objects in the vehicle-mounted refrigerator. The vehicle-mounted refrigerator can be used normally when storing lighter objects and when the car is parked on a slope.

[0004] To achieve the above objectives, this utility model provides a grating-type infrared detection sensor, comprising an inner cylinder and two transparent outer shells symmetrically installed on the left and right sides of the inner cylinder. Openings are provided on both the left and right sides of the inner cylinder. Circular inner ribs for mounting the outer shells are connected to the openings on the outer surfaces of the left and right sides of the inner cylinder. Each outer shell includes a housing fitted within the inner ribs. A U-shaped cavity is provided on the outside of the housing for fitting onto the inner ribs, and the U-shaped cavity is connected to the inner ribs via a snap-fit ​​assembly. An inner cavity is provided on the side of the housing away from the inner cylinder, and a sealing plate is provided within this inner cavity. An infrared emitting module is located on the outer side of the inner cavity on the left side of the inner cylinder, outside the sealing plate. The infrared emitting module includes a first PCB board located outside the sealing plate, on which a plurality of infrared emitting tubes are arranged along the length direction. An infrared receiving module is located on the right side of the inner cavity of the housing, outside the sealing plate. The infrared receiving module includes a second PCB board located outside the sealing plate. The second PCB board has the same number of infrared receiving tubes as the infrared emitting tubes along its length. The infrared receiving tubes and infrared emitting tubes are arranged in a one-to-one correspondence to form infrared pairs. The number of infrared pairs is determined by the size of the inner cylinder and the required coverage area. The infrared emitting tubes and infrared receiving tubes are respectively arranged at equal distances and perpendicularly on the side of the first PCB board and the second PCB board facing the inner cylinder. The sealing plate has a first through hole for the infrared emitting tubes or infrared receiving tubes to pass through the sealing plate. The side of the first PCB board away from the inner cylinder is connected to the connector through four wires. The side of the second PCB board away from the inner cylinder is connected to the connector through five wires. The connector is connected to the main control board through a signal line.

[0005] As a further improvement to this technical solution, the outer shell is integrally formed by a U-shaped cavity and a housing. The U-shaped cavity includes a circular flange facing the inner cylinder, and a gap is provided between the flange and the housing to be inserted into the side of the inner rib.

[0006] As a further improvement to this technical solution, the flange includes two long flanges located at the top and bottom and two short flanges disposed between the long flanges, and the inner rib is provided with a long side corresponding to the long flanges and a short side corresponding to the short flanges.

[0007] As a further improvement to this technical solution, the buckle assembly includes six buckles on the flange and six protrusions that engage with the buckles. Each of the two long flanges has two buckles symmetrically arranged, and the distance between the two buckles on the two long flanges is different. Each of the two short flanges has one buckle. The six protrusions are respectively located on the outer surfaces of the long and short sides of the inner rib.

[0008] As a further improvement of the technical solution, the inner cavity is symmetrically provided with two convex strips on the top and bottom surfaces, and the distance between the two convex strips on the top and bottom surfaces of the inner cavity is different.

[0009] As a further improvement of the technical solution, the shape of the side of the shell close to the inner cylinder is the same as the shape of the opening of the inner cylinder.

[0010] As a further improvement of the technical solution, the four wires connected with the connector on the first PCB board are different in color, the five wires connected with the connector on the second PCB board are different in color, and the connector connects the wires of the same color connected with the first PCB board and the second PCB board together.

[0011] As a further improvement of the technical solution, the main control board comprises a control module, the output end of the control module is electrically connected with the infrared emitting tube, and the input end of the control module is electrically connected with the infrared receiving tube, wherein the control module is used for controlling the infrared emitting tube to emit infrared rays, controlling the emission power of the infrared emitting tube, acquiring the signal of whether the infrared receiving tube receives the infrared rays emitted by the infrared emitting tube, and acquiring the intensity of the infrared rays received by the infrared receiving tube, the control module is a PLC module, and the control module controls the infrared emitting tube to emit infrared rays to the infrared receiving tube in sequence from one side of the first PCB board to the other side of the first PCB board along the long side.

[0012] As a further improvement of the technical solution, the main control board further comprises a comparison module, a display module and a wireless connection module connected with the control module, the comparison module is used for comparing the intensity of the infrared rays emitted by the infrared emitting tube and the intensity of the infrared rays received by the infrared receiving tube, the display module is used for displaying the comparison result of the comparison module, and the display module is wirelessly connected with an external instrument display screen or a user's mobile phone through the wireless connection module, and the comparison result is transmitted to the instrument display screen or the user's mobile phone.

[0013] As a further improvement of the technical solution, the first PCB board and the second PCB board are provided with ultraviolet lamp beads, the sealing plate is provided with a second through hole for the ultraviolet lamp beads to penetrate the sealing plate, and the ultraviolet lamp beads are used for disinfecting the inside of the inner cylinder.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] (1) This utility model uses an outer shell with an infrared pair tube installed to be connected to the inner rib located at the opening of the inner cylinder through a snap-fit ​​assembly, so that the infrared pair tube can be detachably connected to both sides of the inner cylinder. This avoids the situation where the sensor fails due to the small fit clearance between the inner cylinder and the refrigerator chassis, which is the case with weighing sensors. At the same time, the snap-fit ​​assembly can prevent the foam adhesive from seeping into the inner cylinder. Moreover, the asymmetrical setting of the upper and lower snap-fit ​​positions of the snap-fit ​​assembly can prevent the outer shell from being installed backwards, thus achieving the requirement of foolproof installation. In addition, the outer shell is formed by the U-shaped cavity and the shell as an integral part, so that resin can be poured into the outer shell after the PCB board is installed, which can play a role in waterproofing and moisture protection for the PCB board and the infrared pair tube installed on the PCB board.

[0016] (2) This utility model uses infrared receiver tubes and infrared emitter tubes to form an infrared pair tube to scan the inner cylinder for infrared detection. The number of infrared pairs tubes is set according to the size of the inner cylinder, so that it can identify whether there are light items in the inner cylinder from all directions. Compared with the weighing sensor, the weighing sensor may make a mistake when identifying light items or when the items are tilted away from the center of the sensor contact surface due to the tilt of the car refrigerator. Because the weighing method is a small deformation weighing method, it is a mechanical movement. In extreme environments, especially at low temperatures, the weighing accuracy will be greatly reduced. However, the sensor of this utility model does not form a mechanical movement when detecting items. Even at low temperatures, the accuracy is higher and the lifespan is longer.

[0017] (3) This utility model sets the control module of the main control board as a PLC control module to realize infrared detection of whether there is an item inside the inner cylinder by scanning. When the infrared light emitted by the infrared emitting tube is blocked during the scanning process, the infrared receiving tube sends a signal with zero infrared intensity to the control module. The comparison module compares the intensity of the infrared light emitted by the infrared emitting tube with the signal and transmits the result to the external instrument display or user's mobile phone through the wireless connection module, so as to identify that there is an item inside the inner cylinder. Even when there is a transparent item inside the inner cylinder, the infrared light emitted by the infrared emitting tube is not completely blocked, and will be reflected when passing through the transparent item. The intensity of the infrared light is weakened by refraction and reflection. The comparison module compares the intensity of the received infrared light with that of the emitted infrared light and transmits the result to the external instrument display or user's mobile phone via the wireless connection module, so as to identify that the item is inside the inner cylinder. This scanning detection method can avoid the identification interference caused by the large amount of infrared light diffuse reflection inside the inner cylinder due to multiple emitters emitting infrared light at the same time. Moreover, it can identify the items inside the inner cylinder by area. In addition, the scanning method ensures that only one infrared pair is in working state during each scan, while the other infrared pairs are in standby state, which greatly reduces the operating current power consumption and extends the life of the infrared pairs.

[0018] (4) The utility model discloses a control module controls the emission power of infrared emission tube to improve, makes its infrared ray penetration ability enhancement through transparent shell, and accurate recognition inner cylinder article, and can add ultraviolet lamp pearl on the PCB board, can disinfect the inside of inner cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be to the embodiment or the description of prior art needed to use the drawing briefly introduced, obviously, the following description in the drawing only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0020] Figure 1 It is the stereogram of grating type infrared object detection sensor of the utility model embodiment one.

[0021] Figure 2 It is the explosion schematic view of grating type infrared object detection sensor of the utility model embodiment one.

[0022] Figure 3 It is the inner cylinder structure schematic view of the utility model embodiment one.

[0023] Figure 4 It is the shell structure schematic view of the utility model embodiment one one.

[0024] Figure 5 It is the shell structure schematic view of the utility model embodiment one two.

[0025] Figure 6 It is the shell and inner cylinder connection plan view of the utility model embodiment one.

[0026] Figure 7 It is Figure 6 the A-A place partial section view of.

[0027] Figure 8 It is the first PCB board and sealing plate connection schematic view of the utility model embodiment one.

[0028] Figure 9 It is the working principle diagram of grating type infrared object detection sensor of the utility model embodiment one.

[0029] Figure 10 It is the first PCB board and sealing plate connection schematic view of the utility model embodiment two.

[0030] The drawings are marked as: inner cylinder 1, opening 101, inner rib 102, outer shell 2, shell 201, inner cavity 2011, U-shaped cavity 202, flange 2021, sealing plate 3, first through hole 301, second through hole 302, infrared emission module 4, first PCB board 401, infrared emission tube 402, infrared receiving module 5, second PCB board 501, infrared receiving tube 502, wire 6, connector 7, gap 8, buckle assembly 9, buckle 901, protruding block 902, main control board 10, control module 11, comparison module 12, display module 13, wireless connection module 14, instrument display screen 15, user mobile phone 16, convex strip 17, recess 18, ultraviolet lamp bead 19. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the embodiments of the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the embodiments of the present application, it should be understood that, if the present application is related to the direction indication, for example, the orientation or position relationship of the upper, lower, left, right, front, back, inner, outer and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0033] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0034] In the embodiments of the present application, unless otherwise specifically defined and limited, if there are terms such as "installation", "connection", "connection", "fixing" and the like, they should be understood in a broad sense, for example, they can be fixedly connected, or they can be detachably connected, or they can be integrated. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium. It can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] Embodiment one

[0036] As Figures 1-9 shown, the embodiment provides a grating type infrared object detection sensor, which comprises an inner cylinder 1 and two transparent housings 2 symmetrically installed on the left and right side surfaces of the inner cylinder 1, openings 101 are formed on the left and right side surfaces of the inner cylinder 1, and the outer surfaces of the left and right side surfaces of the inner cylinder 1 are connected with a ring-shaped inner rib 102 for mounting the housings 2 at the openings 101, the housing 2 comprises a shell 201 sleeved on the inner rib 102, a U-shaped cavity 202 is arranged on the outer surface of the shell 201 for sleeving on the inner rib 102, and the U-shaped cavity 202 is connected with the inner rib 102 through a buckle assembly 9, an inner cavity 2011 is formed in the shell 201 away from the side surface of the inner cylinder 1, a sealing plate 3 is arranged in the inner cavity 2011, an infrared emission module 4 is arranged in the inner cavity 2011 of the shell 201 on the outer side of the sealing plate 3 on the left side of the inner cylinder 1, the infrared emission module 4 comprises a first PCB board 401 arranged on the outer side of the sealing plate 3, and a plurality of infrared emission tubes 402 are arranged on the first PCB board 401 along the length direction, an infrared receiving module 5 is arranged in the inner cavity 2011 of the shell 201 on the outer side of the sealing plate 3 on the right side of the inner cylinder 1, the infrared receiving module 5 comprises a second PCB board 501 arranged on the outer side of the sealing plate 3, and a plurality of infrared receiving tubes 502 are arranged on the second PCB board 501 along the length direction, the number of the infrared receiving tubes 502 is the same as that of the infrared emission tubes 402, and the infrared emission tubes 402 and the infrared receiving tubes 502 correspond to each other to form infrared pairs, the number of the infrared pairs is determined according to the size of the inner cylinder 1 and the detection coverage, the infrared emission tubes 402 and the infrared receiving tubes 502 are perpendicularly arranged on the first PCB board 401 and the second PCB board 501 respectively and are equidistantly arranged towards the side surface of the inner cylinder 1, a first through hole 301 is formed in the sealing plate 3 for the infrared emission tubes 402 or the infrared receiving tubes 502 to penetrate the sealing plate 3, four wires 6 are connected between the side surface of the first PCB board 401 away from the inner cylinder 1 and a connector 7, five wires 6 are connected between the side surface of the second PCB board 501 away from the inner cylinder 1 and the connector 7, and the connector 7 is connected with a main control board 10 through a signal line.

[0037] In the embodiment, as Figure 4 and Figure 5 shown, the housing 2 is formed by integrating the U-shaped cavity 202 and the shell 201, so that the resin can be poured into the housing 2 after the PCB board is installed, and the PCB board and the infrared pairs installed on the PCB board are waterproof and moisture-proof.

[0038] In the embodiment, as Figure 5 shown, the U-shaped cavity 202 comprises a ring-shaped flange 2021 facing the inner cylinder 1, and a gap 8 is arranged between the flange 2021 and the shell 201 for inserting the side edge of the inner rib 102.

[0039] Specifically, when the shell 2 is mounted to the inner cylinder 1, the inner rib 102 of the inner cylinder 1 is inserted into the gap 8 between the flange 2021 and the shell 201, so that the shell 2 is sleeved on the inner rib 102.

[0040] In the embodiment, as shown in Figure 4 and Figure 5 , the flange 2021 includes two long flanges located at the top and bottom and two short flanges arranged between the long flanges, and the inner rib 102 is provided with long sides corresponding to the long flanges and short sides corresponding to the short flanges.

[0041] Specifically, when the shell 2 is sleeved on the inner rib 102, the long flanges are sleeved on the long sides of the inner rib 102, and the short flanges are sleeved on the short sides of the inner rib 102.

[0042] In the embodiment, as shown in Figures 2-7 , the buckle assembly 9 includes six buckles 901 provided on the flange 2021 and six protrusions 902 engaged with the buckles 901, wherein two buckles 901 are symmetrically arranged on each of the two long flanges, and the distance between the two buckles 901 on the two long flanges is different, and one buckle 901 is arranged on each of the two short flanges, and six protrusions 902 are respectively arranged on the outer surfaces of the long sides and the short sides of the inner rib 102.

[0043] Specifically, the distance between the two buckles 901 on the two long flanges located at the top and bottom is different, so that the buckles 901 located at the top and bottom are asymmetric, so as to meet the anti-fumble installation requirement.

[0044] In the embodiment, as shown in Figure 4 , the inner cavity 2011 is provided with two protrusions 17 symmetrically arranged on the top and bottom surfaces, and the distance between the two protrusions 17 on the top and bottom surfaces of the inner cavity 2011 is different, and the top and bottom of the sealing plate 3, the first PCB board 401 and the second PCB board 501 are provided with two recesses 18 corresponding to the protrusions 17.

[0045] By arranging the protrusions 17 and the recesses 18 corresponding to the protrusions 17, the sealing plate 3, the first PCB board 401 and the second PCB board 501 are stably installed in the inner cavity 2011; the distance between the two protrusions 17 on the top and bottom surfaces of the inner cavity 2011 is different, so that the protrusions 17 on the top and bottom surfaces are asymmetric, so as to meet the anti-fumble installation requirement.

[0046] In the embodiment, as shown in Figure 2 , the shape of the side of the shell 201 close to the inner cylinder 1 is the same as the shape of the opening 101 of the inner cylinder 1, so that the transparent shell 201 is completely installed on the opening 101 of the inner cylinder 1, and the infrared rays emitted by the infrared emitter tube 402 can all pass through the shell 201 to the inside of the inner cylinder 1.

[0047] In the embodiment, asFigure 1 and Figure 2 As shown in the figure, the four wires 6 connected with the connector 7 are of different colors on the first PCB board 401, the five wires 6 connected with the connector 7 are of different colors on the second PCB board 501, the connector 7 connects the wires 6 of the same color connected with the first PCB board 401 and the second PCB board 501 together, so that the infrared receiving tube 502 and the infrared emitting tube 402 form an infrared pair tube through the connector 7, and the infrared pair tube is connected with the main control board 10, so that the main control board 10 can obtain the scanning result of the infrared pair tube on the inner cylinder 1.

[0048] In this embodiment, as shown in the figure, Figure 9 The main control board 10 comprises a control module 11, the output end of the control module 11 is electrically connected with the infrared emitting tube 402, and the input end of the control module 11 is electrically connected with the infrared receiving tube 502, wherein the control module 11 is used for controlling the infrared emitting tube 402 to emit infrared rays, controlling the emission power of the infrared emitting tube 402, obtaining the signal whether the infrared receiving tube 502 receives the infrared rays emitted by the infrared emitting tube 402, and obtaining the intensity of the infrared rays received by the infrared receiving tube 502.

[0049] Specifically, the control module 11 is the core module of the main control board 10, which controls the infrared pair tube externally and controls other modules of the main control board 10 internally.

[0050] In this embodiment, as shown in the figure, Figure 9 The control module 11 is a PLC module, and the control module 11 controls the infrared emitting tube 402 to emit infrared rays to the infrared receiving tube 502 in sequence from the side of the first PCB board 401 to the other side of the first PCB board 401 along the long side.

[0051] Specifically, the control module 11 controls the infrared emitting tube 402 on the first PCB board 401 to emit infrared rays to the infrared receiving tube 502 in sequence from the left side of the first PCB board 401 to the right side of the first PCB board 401 along the long side, and then controls the infrared emitting tube 402 on the first PCB board 401 to emit infrared rays to the infrared receiving tube 502 in sequence from the right side of the first PCB board 401 to the left side of the first PCB board 401 along the long side, so as to realize the detection of the front and back circular scanning mode of the infrared rays in the inner cylinder 1.

[0052] In this embodiment, as shown in the figure, Figure 9 The main control board 10 further comprises a comparison module 12 connected with the control module 11 and a display module 13, the comparison module 12 is used for comparing the intensity of the infrared rays emitted by the infrared emitting tube 402 and the intensity of the infrared rays received by the infrared receiving tube 502, and the display module 13 is used for displaying the comparison result of the comparison module 12.

[0053] Specifically, when the infrared receiving tube 502 receives infrared intensity of zero or less than the infrared emitting tube 402 emits infrared intensity, the comparison module 12 can determine that the inner cylinder 1 contains the article, and at the same time, the display module 13 displays that the inner cylinder 1 contains the article.

[0054] In the embodiment, as shown in the figure, Figure 9 The master control board 10 further comprises a wireless connection module 14 connected with the control module 11, and the display module 13 is wirelessly connected with the external instrument display screen 15 or the user's mobile phone 16 through the wireless connection module 14, and the comparison result is transmitted to the instrument display screen 15 or the user's mobile phone 16.

[0055] Specifically, the wireless connection module 14 is arranged to facilitate the comparison module 12 to compare the result without signal line, so that the user can see the result displayed on the instrument display screen 15 in the car or on the mobile phone.

[0056] As shown in the figure, Figure 9 The working principle of the embodiment is as follows: when the device is started, the control module 11 of the master control board 10 controls the infrared pair tube, at this time, the control module 11 controls the infrared emitting tube 402 on the first PCB board 401 to emit infrared to the infrared receiving tube 502 in sequence from the left side of the first PCB board 401 along the long side to the right side of the first PCB board 401, and then controls the infrared emitting tube 402 on the first PCB board 401 to emit infrared to the infrared receiving tube 502 in sequence from the right side of the first PCB board 401 along the long side to the left side of the first PCB board 401, so as to achieve the front and rear cyclic scanning mode detection of the infrared in the inner cylinder 1. When the inner cylinder 1 contains non-transparent articles, the infrared emitted by the infrared emitting tube 402 is blocked during the infrared scanning process, the infrared receiving tube 502 sends a signal to the control module 11 that the infrared intensity is zero, the comparison module 12 transmits the comparison result of the intensity of the received infrared compared with the intensity of the emitted infrared to the external instrument display screen 15 or the user's mobile phone 16 through the wireless connection module 14, so as to identify that the inner cylinder 1 contains the article; when the inner cylinder 1 contains transparent articles, the infrared emitted by the infrared emitting tube 402 is not completely blocked, but is reflected and refracted when passing through the transparent articles, so that its intensity is weakened, the comparison module 12 transmits the comparison result that the intensity of the received infrared is less than the intensity of the emitted infrared to the external instrument display screen 15 or the user's mobile phone 16 through the wireless connection module 14, so as to identify that the inner cylinder 1 contains the article.

[0057] Embodiment two

[0058] The embodiment provides a grating type infrared article detection sensor, which is different from the first embodiment in that, as shown in the figure, Figure 10As shown, the first PCB board 401 and the second PCB board 501 are also provided with a plurality of ultraviolet lamp beads 19, and the sealing plate 3 is provided with a second through hole 302 for the ultraviolet lamp beads 19 to penetrate the sealing plate 3, and the ultraviolet lamp beads 19 are used for disinfecting the inside of the inner cylinder 1.

[0059] The above are only preferred embodiments of the present application, and are not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A grating-type infrared object detection sensor, characterized in that, The device includes an inner cylinder (1) and two transparent outer shells (2) symmetrically installed on the left and right sides of the inner cylinder (1). Openings (101) are provided on both the left and right sides of the inner cylinder (1). A circular inner rib (102) for mounting the outer shell (2) is connected to the outer surface of both the left and right sides of the inner cylinder (1) at the openings (101). The outer shell (2) includes a housing (201) fitted inside the inner rib (102). A U-shaped cavity (202) is provided on the outside of the housing (201) for fitting onto the inner rib (102), and the U-shaped cavity (202) is connected to the inner rib via a snap-fit ​​assembly (9). (102) Connection, the inner cavity (2011) is opened on the side of the shell (201) away from the inner cylinder (1), the inner cavity (2011) is provided with a sealing plate (3), and an infrared emitting module (4) is provided on the outer side of the inner cavity (2011) of the shell (201) located on the left side of the inner cylinder (1) outside the sealing plate (3). The infrared emitting module (4) includes a first PCB board (401) provided on the outer side of the sealing plate (3). A plurality of infrared emitting tubes (402) are provided on the first PCB board (401) along the length direction. The shell (201) located on the right side of the inner cylinder (1) is connected. An infrared receiving module (5) is provided outside the sealing plate (3) in the cavity (2011). The infrared receiving module (5) includes a second PCB board (501) located outside the sealing plate (3). The second PCB board (501) has the same number of infrared receiving tubes (502) as the infrared emitting tubes (402) along its length. The infrared receiving tubes (502) and infrared emitting tubes (402) correspond one-to-one to form infrared pairs. The number of infrared pairs is determined according to the size of the inner cylinder (1) and the required coverage area. The infrared emitting tubes (402) and infrared receiving tubes (502) are respectively The first PCB board (401) and the second PCB board (501) are vertically arranged at equal distances on the side facing the inner cylinder (1). The sealing plate (3) has a first through hole (301) for the infrared emitting tube (402) or the infrared receiving tube (502) to pass through the sealing plate (3). The side of the first PCB board (401) away from the inner cylinder (1) is connected to the connector (7) through four wires (6). The side of the second PCB board (501) away from the inner cylinder (1) is connected to the connector (7) through five wires (6). The connector (7) is connected to the main control board (10) through a signal line.

2. The grating-type infrared object detector according to claim 1, characterized in that, The outer shell (2) is integrally formed by a U-shaped cavity (202) and a shell (201). The U-shaped cavity (202) includes a circular flange (2021) facing the inner cylinder (1). A gap (8) is provided between the flange (2021) and the shell (201) for insertion into the side of the inner rib (102).

3. The grating-type infrared object detector according to claim 2, characterized in that, The flange (2021) includes two long flanges located at the top and bottom and two short flanges disposed between the long flanges. The inner rib (102) is provided with a long side corresponding to the long flanges and a short side corresponding to the short flanges.

4. A grating-type infrared object detector according to claim 3, characterized in that, The buckle assembly (9) includes six buckles (901) on the flange (2021) and six protrusions (902) that engage with the buckles (901). Two buckles (901) are symmetrically arranged on each of the two long flanges, and the distance between the two buckles (901) on the two long flanges is different. One buckle (901) is arranged on each of the two short flanges. The six protrusions (902) are respectively arranged on the outer surface of the long side and the short side of the inner rib (102).

5. A grating-type infrared object detector according to claim 1, characterized in that, The inner cavity (2011) has two symmetrical protrusions (17) on its top and bottom surfaces, and the distance between the two protrusions (17) on the top and bottom surfaces of the inner cavity (2011) is different. The sealing plate (3), the first PCB board (401), and the second PCB board (501) all have two grooves (18) corresponding to the protrusions (17) on their top and bottom.

6. A grating-type infrared object detector according to claim 1, characterized in that, The shape of the side of the shell (201) near the inner cylinder (1) is the same as the shape of the opening (101) of the inner cylinder (1).

7. A grating-type infrared object detector according to claim 1, characterized in that, The four wires (6) connecting the first PCB board (401) and the connector (7) are all different colors. The five wires (6) connecting the second PCB board (501) and the connector (7) are all different colors. The connector (7) will connect the wires (6) of the same color that are connected to the first PCB board (401) and the second PCB board (501) together.

8. A grating-type infrared object detector according to claim 1, characterized in that, The main control board (10) includes a control module (11). The output end of the control module (11) is electrically connected to the infrared emitting tube (402), and the input end of the control module (11) is electrically connected to the infrared receiving tube (502). The control module (11) is used to control the infrared emitting tube (402) to emit infrared rays, control the emission power of the infrared emitting tube (402), and obtain whether the infrared receiving tube (502) receives the signal of the infrared emitting tube (402) emitting infrared rays and obtain the intensity of the infrared rays received by the infrared receiving tube (502). The control module (11) is a PLC module. The control module (11) controls the infrared emitting tube (402) to emit infrared rays to the infrared receiving tube (502) in sequence from one side of the first PCB board (401) along the long side to the other side of the first PCB board (401).

9. A grating-type infrared object detector according to claim 8, characterized in that, The main control board (10) also includes a comparison module (12), a display module (13), and a wireless connection module (14) connected to the control module (11). The comparison module (12) is used to compare the intensity of infrared radiation emitted by the infrared emitter (402) and the intensity of infrared radiation received by the infrared receiver (502). The display module (13) is used to display the comparison result of the comparison module (12). The display module (13) is wirelessly connected to an external instrument display screen (15) or a user's mobile phone (16) through the wireless connection module (14) to transmit the comparison result to the instrument display screen (15) or the user's mobile phone (16).

10. A grating-type infrared object detector according to claim 1, characterized in that, The first PCB board (401) and the second PCB board (501) are provided with ultraviolet lamp beads (19), and the sealing plate (3) is provided with a second through hole (302) for the ultraviolet lamp beads (19) to penetrate the sealing plate (3). The ultraviolet lamp beads (19) are used to disinfect the inside of the inner cylinder (1).

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