A detection device for food grade carbon dioxide

Abstract

The present invention relates to the field of carbon dioxide detection equipment, and in particular to a detection device for food-grade carbon dioxide. In view of the problem that the prior art cannot actively re-purify the gas after detecting that the gas does not meet the specifications, resulting in reduced production efficiency, a detection device for food-grade carbon dioxide is proposed. A detector for detecting the gas inside the first connecting pipe is installed on the surface of the first connecting pipe on the lower side of the exhaust component. During the exhaust process of the exhaust component, when the gas does not meet the standard of the detector, the detector can control the exhaust component to push the gas, so that the non-compliant gas can re-enter the air guide pipe through the transition pipe and the air outlet one-way valve, and re-enter the solution through the air guide pipe for further purification.

Description

Technical Field

[0001] The invention relates to the field of carbon dioxide detection equipment, and in particular to a detection device for food-grade carbon dioxide. Background Art

[0002] The preparation of food-grade carbon dioxide mainly comes from the fermentation process or the purification of natural gas and liquefied petroleum gas. During the fermentation process, high-purity carbon dioxide can be obtained by controlling the fermentation conditions. Food-grade carbon dioxide has the effect of inhibiting bacteria and microbial growth, so it is widely used in food preservation. In modified atmosphere packaging, by controlling the concentration of carbon dioxide in the package, the shelf life of food can be extended, food spoilage and nutritional loss can be reduced. As a gas widely used in the food industry, its unique physical and chemical properties make it an indispensable element in the process of food production and preservation; when preparing food-grade carbon dioxide, it is necessary to test the prepared carbon dioxide gas to ensure that the produced carbon dioxide gas meets the food-grade standards and avoid harmful substances in the produced carbon dioxide. The current detection equipment cannot actively re-purify the carbon dioxide gas once it detects that the gas does not meet the specifications, resulting in reduced production efficiency. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a detection device for food-grade carbon dioxide, which effectively solves the problems mentioned in the above background technology.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is:

[0005] A detection device for food-grade carbon dioxide comprises an outer cylinder, a detachable inner cylinder is installed inside the outer cylinder, a detachable sealing cover is installed on the upper end of the outer cylinder, an air guide tube is fixedly connected to the non-central position of the upper end of the outer cylinder, the lower end of the air guide tube extends to the bottom end of the inner cylinder, a first connecting tube is fixedly connected to the middle part of the sealing cover, the lower end of the first connecting tube extends to the upper side of the inner cylinder and the lower end of the first connecting tube is fixedly connected to an air inlet one-way valve, the surface of the first connecting tube is fixedly connected and connected to a transition tube, the other end of the transition tube is fixedly connected to an air outlet one-way valve, the other end of the air outlet one-way valve is fixedly connected and connected to the air guide tube, an air extraction component that can extract and push air is installed on the upper end of the first connecting tube, a detector for detecting gas inside the first connecting tube is installed on the surface of the first connecting tube on the lower side of the air extraction component, and during the air extraction process of the air extraction component, when the gas does not meet the standard of the detector, the detector can control the air extraction component to push air.

[0006] Preferably, an annular tube is provided on the inner lower side of the inner tube, the lower end of the air guide tube is fixedly connected and communicated with the annular tube, and a plurality of air outlet holes are provided on the surface of the annular tube.

[0007] Preferably, a plurality of detachable placement plates are installed inside the inner cylinder, and the plurality of placement plates are evenly arranged vertically inside the inner cylinder. A plurality of arc holes are opened in a ring shape with the center of the placement plates as the axis on the surface of the placement plates, and filter pads are placed on the upper ends of the placement plates, and a plurality of mounting holes distributed in a ring shape are opened on the surfaces of the filter pads. A plurality of limiting shafts distributed in a ring shape and coaxially arranged with the mounting holes are fixedly connected to the upper ends of the placement plates, and the limiting shafts can be inserted into the mounting holes when the filter pads are placed on the placement plates.

[0008] Preferably, two corresponding sides of the upper end of the inner cylinder are respectively provided with connecting vertical grooves downwards, and the surface of the connecting vertical grooves is provided with a plurality of vertically arranged arc-shaped grooves, and two corresponding sides of the circumferential surface of the placing plate are respectively fixedly connected with clamping plates that can slide with the connecting vertical grooves and the arc-shaped grooves, and when the placing plate is placed in the inner cylinder, the clamping plates can be clamped on the inner sides of the arc-shaped grooves.

[0009] Preferably, the middle part of the upper end of the placing plate is fixedly connected with a mounting cylinder, the upper end of the mounting cylinder is vertically slidably connected with a pressure rod that can move up and down, one end of the pressure rod extending to the inside of the mounting cylinder is fixedly connected with a slide plate, the slide plate is slidably connected to the inside of the mounting cylinder, the lower end of the slide plate is fixedly connected with a support spring, the lower end of the support spring is fixedly connected to the lower end of the mounting cylinder, a through hole for the mounting cylinder to pass through is provided in the middle part of the filter pad, and a groove is provided in the middle part of the lower end of the placing plate, when the placing plates are overlapped and placed, the upper end of the pressure rod is against the groove, and when the upper placing plate is installed, the lower pressure rod will be squeezed to make the lower pressure rod move toward the inside of the placing cylinder, and then the support spring is compressed by the slide plate.

[0010] Preferably, the corresponding two sides of the circumferential surface of the inner cylinder are respectively fixedly connected with vertically arranged limit protrusions, and the corresponding two sides inside the outer cylinder are respectively provided with limit grooves. After the inner cylinder is installed in the outer cylinder, the limit protrusions and the limit grooves are slidably matched, and the bottom of the inner cylinder is rotatably connected to an auxiliary ring, which is threadedly connected to the bottom of the outer cylinder.

[0011] Preferably, the exhaust component includes a mounting shell fixedly connected to the upper end of the first connecting tube, the upper end of the mounting shell is fixedly connected and connected to a second connecting tube, the interior of the mounting shell is rotatably connected to an exhaust fan, the bottom of the exhaust fan is coaxially fixedly connected to a first bevel gear, the lower side of the first bevel gear is meshed with a second bevel gear, the middle part of the second bevel gear is fixedly connected to a connecting shaft, the connecting shaft is rotatably connected to the surface of the mounting shell, and the other end of the connecting shaft is provided with a forward and reverse motor, the power output end of the forward and reverse motor is fixedly connected to the connecting shaft, and the forward and reverse motor is fixedly connected to the surface of the mounting shell; the forward and reverse motor is electrically connected to the detector, and the forward and reverse rotation of the forward and reverse motor is controlled by the detector, and when the forward and reverse motor rotates forward, it drives the exhaust fan to rotate and draw air upward, and when the detector detects that the gas does not meet the standard, it can control the forward and reverse motor to reverse, driving the exhaust fan to rotate in the opposite direction to push the gas downward.

[0012] Preferably, a collecting tray is fixedly connected to the lower end of the first connecting pipe.

[0013] Preferably, tooth plates are fixedly connected on corresponding sides of the circumferential surface of the sealing cover, transmission gears are meshed on the outer sides of the tooth plates, support plates are rotatably connected to the front and rear ends of the transmission gears, the lower ends of the support plates are fixedly connected to the outer cylinder, control gears are meshed on the outer sides of the transmission gears, the two ends of the control gears are rotatably connected to the support plates, the two ends of the control gears are fixedly connected to side plates, and the other ends of the two side plates are fixedly connected to handles.

[0014] Preferably, one of the support plates is fixedly connected to a ratchet, which is coaxially arranged with the transmission gear, and a ratchet block is meshed on the upper side of the ratchet. When the ratchet block is meshed with the ratchet, the handle can only swing downward in one direction, and a handle is fixedly connected to the upper end of the ratchet block; a slider is fixedly connected to the surface of the ratchet block, and a sliding groove is provided on the surface of the support plate corresponding to the slider, the slider is slidably connected to the sliding groove, and an engaging spring is fixedly connected to the upper end of the slider, and the other end of the engaging spring is fixedly connected to the sliding groove.

[0015] The present invention has novel structure, ingenious design, simple and convenient operation, and has the following advantages compared with the prior art:

[0016] When the device is in use, the carbon dioxide gas can be removed from the inner cylinder and then sucked to the first connecting pipe by the exhaust component, and then tested by a carbon dioxide detector. The carbon dioxide detector can accurately detect whether the carbon dioxide meets the standards; when the carbon dioxide gas does not meet the detection indicators of the detector, the detector can push the gas downward by controlling the exhaust component, so that the non-compliant gas can re-enter the air guide pipe through the transition pipe and the air outlet one-way valve, and re-enter the solution through the air guide pipe for further purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the overall structure of a detection device for food-grade carbon dioxide according to the present invention.

[0018] Figure 2 The present invention is a schematic diagram of the internal structure of an inner cylinder of a detection device for food-grade carbon dioxide.

[0019] Figure 3 The present invention is a schematic diagram of the inner cylinder installation structure of a detection device for food-grade carbon dioxide.

[0020] Figure 4 This is a first schematic diagram of a mounting structure of a placement plate for a food-grade carbon dioxide detection device according to the present invention.

[0021] Figure 5 This is a second structural schematic diagram of a placement plate installation structure for a food-grade carbon dioxide detection device of the present invention.

[0022] Figure 6 The figure is a schematic diagram of the installation structure of a filter pad for food-grade carbon dioxide according to the present invention.

[0023] Figure 7 The figure is a schematic diagram of the internal structure of an installation cylinder for food-grade carbon dioxide according to the present invention.

[0024] Figure 8 The figure is a schematic diagram of a groove structure for food-grade carbon dioxide according to the present invention.

[0025] Fig. 9 The present invention is a schematic diagram of the annular tube installation structure of a detection device for food-grade carbon dioxide.

[0026] Fig.10 This is a first schematic diagram of the structure of an exhaust component of a detection device for food-grade carbon dioxide according to the present invention.

[0027] Fig.11 This is a second schematic diagram of the exhaust structure component of a detection device for food-grade carbon dioxide of the present invention.

[0028] Fig.12 This is a first schematic diagram of a handle driving structure of a detection device for food-grade carbon dioxide of the present invention.

[0029] Fig.13 This is a second schematic diagram of a handle driving structure of a detection device for food-grade carbon dioxide of the present invention.

[0030] Numbers in the figure: 1-outer cylinder, 2-sealing cover, 3-inner cylinder, 4-auxiliary ring, 5-limiting protrusion, 6-limiting groove, 7-connecting vertical groove, 8-arc-shaped slot, 9-placing plate, 10-card, 11-arc-shaped hole, 13-limiting shaft, 14-mounting hole, 15-mounting cylinder, 16-pressure rod, 17-support spring, 18-slide plate, 19-groove, 20-air guide pipe, 21-annular pipe, 22-air outlet, 23-first connecting pipe, 24-collecting plate, 25-transition pipe, 26-air inlet One-way valve, 27-exhaust one-way valve, 28-installation shell, 29-second connecting pipe, 30-exhaust fan, 31-detector, 32-first bevel gear, 33-second bevel gear, 34-forward and reverse motor, 35-auxiliary protrusion, 36-support plate, 37-tooth plate, 38-transmission gear, 39-control gear, 40-handle, 41-ratchet, 42-ratchet block, 43-handle, 44-slider, 45-slide, 46-engagement spring, 47-protective shell, 48-side plate, 49-filter pad. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0032] like Figure 1-13 As shown, the present invention provides a detection device for food-grade carbon dioxide, comprising an outer cylinder 1, a detachable inner cylinder 3 is installed inside the outer cylinder 1, a detachable sealing cover 2 is installed on the upper end of the outer cylinder 1, an air guide tube 20 is fixedly connected to the non-central position of the upper end of the outer cylinder 1, the lower end of the air guide tube 20 extends to the bottom end of the inner cylinder 3, a first connecting tube 23 is fixedly connected to the middle of the sealing cover 2, the lower end of the first connecting tube 23 extends to the upper side of the inner cylinder 3 and the lower end of the first connecting tube 23 is fixedly connected to an air intake check valve 26, the first connecting tube The surface of the first connecting tube 23 is fixedly connected and communicated with a transition tube 25, the other end of the transition tube 25 is fixedly connected with an air outlet one-way valve 27, the other end of the air outlet one-way valve 27 is fixedly connected and communicated with the air guide tube 20, an air suction component for suction and air pushing is installed on the upper end of the first connecting tube 23, a detector 31 for detecting the gas inside the first connecting tube 23 is installed on the surface of the first connecting tube 23 at the lower side of the air suction component, during the air suction process of the air suction component, when the gas does not meet the standard of the detector 31, the detector 31 can control the air suction component to push the gas.

[0033] The inner tube 3 is an open structure at the upper end, and a saturated sodium bicarbonate solution can be placed inside. When the device is in use, the upper end of the air guide tube 20 can be connected to the carbon dioxide delivery device, so that the carbon dioxide gas enters the saturated sodium bicarbonate solution in the inner tube 3 through the air guide tube 20, thereby achieving the effect of purifying the carbon dioxide. The reacted gas breaks through the solution and rises upward. Under the suction of the exhaust component, the air inlet check valve 26 can be opened. At this time, the air outlet check valve 27 is in a closed state. Then, the gas is attracted to move upward under the guidance of the exhaust component. When passing through the first connecting pipe 23, it can be detected by a detector 31 for detecting carbon dioxide. When the gas does not meet the detection index of the carbon dioxide detector, the detector 31 can push the gas downward by controlling the exhaust component. At this time, the suction of the exhaust component disappears, and the thrust increases. After the suction disappears, the air inlet check valve 26 opens, and after the thrust increases, the air outlet check valve 27 opens. The non-compliant gas can re-enter the air guide tube 20 through the transition pipe 25 and the air outlet check valve 27, and re-enter the solution through the air guide tube 20 for further purification.

[0034] An annular tube 21 is provided at the lower inner side of the inner tube 3, and the lower end of the air guide tube 20 is fixedly connected and communicated with the annular tube 21. A plurality of air outlet holes 22 are provided on the surface of the annular tube 21. Through the provision of the annular tube 21, the gas entering the annular tube 21 can be dispersed to the lower end of the inner tube 3 as a whole, thereby dispersing the gas and avoiding the accumulation of the crystalline material after the reaction.

[0035] A plurality of detachable placement plates 9 are installed inside the inner cylinder 3, and the plurality of placement plates 9 are evenly arranged vertically inside the inner cylinder 3. A plurality of arc holes 11 are opened in a ring shape with the center of the placement plate 9 as the axis on the surface of the placement plate 9. Filter pads 49 are placed on the upper ends of the placement plates 9 respectively. The filter pads 49 are used to adsorb the crystalline substances generated by the reaction. After the filter pads 49 are covered with a saturated sodium bicarbonate solution, the gas in the solution rises upward through the filter pads 49, and the crystalline substances generated by the reaction can stay in the filter pads 49. After the inner cylinder 3 is taken out, the filter pads 49 are taken out for cleaning and can be reused. A plurality of mounting holes 14 distributed in a ring shape are opened on the surface of the filter pad 49, and a plurality of limiting shafts 13 distributed in a ring shape and coaxially arranged with the mounting holes 14 are fixedly connected to the upper ends of the placement plates 9. When the filter pad 49 is placed on the placement plate 9, the limiting shafts 13 can be inserted into the mounting holes 14, thereby improving the stability of the filter pad 49 when it is placed.

[0036] The corresponding two sides of the upper end of the inner cylinder 3 are respectively provided with connecting vertical grooves 7 downwards, and the surface of the connecting vertical grooves 7 is provided with a plurality of vertically arranged arc-shaped grooves 8. The corresponding two sides of the circumferential surface of the placement plate 9 are respectively fixedly connected with clamping plates 10 that can slide with the connecting vertical grooves 7 and the arc-shaped grooves 8. When the placement plate 9 is placed in the inner cylinder 3, the clamping plate 10 can be clamped on the inner side of the arc-shaped groove 8 to improve the stability of the placement plate 9 when it is placed. When the placement plate 9 needs to be taken out, the placement plate 9 can be rotated to make the clamping plate 10 correspond to the connecting vertical groove 7, and then the placement plate 9 can be taken out upwards.

[0037] The middle part of the upper end of the placement plate 9 is fixedly connected with a mounting cylinder 15, and the upper end of the mounting cylinder 15 is vertically slidably connected with a pressure rod 16 that can move up and down. The pressure rod 16 extends to one end of the interior of the mounting cylinder 15 and is fixedly connected with a slide plate 18. The slide plate 18 is slidably connected to the interior of the mounting cylinder 15, and the lower end of the slide plate 18 is fixedly connected with a support spring 17. The lower end of the support spring 17 is fixedly connected to the lower end of the interior of the mounting cylinder 15. A through hole for the mounting cylinder 15 to pass through is opened in the middle of the filter pad 49, and a groove 19 is opened in the middle of the lower end of the placement plate 9. When the placement plates 9 are overlapped and placed, the upper end of the pressure rod 16 is against the groove 19, which plays a role in positioning the pressure rod 16. When the upper placement plate 9 is installed, the pressure rod 16 on the lower side will be squeezed, so that the pressure rod 16 on the lower side moves toward the inside of the placement cylinder, and then the support spring 17 is compressed by the slide plate 18. Under the action of the elastic force of the support spring 17, the pressure between the two adjacent placement plates 9 can be increased, further improving the stability of the placement plate 9 when placed.

[0038] The corresponding two sides of the circumferential surface of the inner cylinder 3 are respectively fixedly connected with vertically arranged limiting protrusions 5, and the corresponding two sides inside the outer cylinder 1 are respectively provided with limiting grooves 6. After the inner cylinder 3 is installed in the outer cylinder 1, the limiting protrusion 5 and the limiting groove 6 are slidably matched. Under the sliding cooperation between the limiting protrusion 5 and the limiting groove 6, the bottom of the inner cylinder 3 is rotatably connected with an auxiliary ring 4, and the auxiliary ring 4 is threadedly connected to the bottom of the outer cylinder 1, so that the inner cylinder 3 can be stably installed in the outer cylinder 1. When the auxiliary ring 4 is connected to the bottom of the outer cylinder 1 by rotation, the inner cylinder 3 will not rotate, and remain stable, avoiding the internal clamping plate 10 from colliding with the air guide tube 20.

[0039] The exhaust component includes a mounting shell 28 fixedly connected to the upper end of the first connecting pipe 23, the upper end of the mounting shell 28 is fixedly connected and connected to a second connecting pipe 29, the interior of the mounting shell 28 is rotatably connected to an exhaust fan 30, the bottom of the exhaust fan 30 is coaxially fixedly connected to a first bevel gear 32, the lower side of the first bevel gear 32 is meshed with a second bevel gear 33, the middle part of the second bevel gear 33 is fixedly connected to a connecting shaft, the connecting shaft is rotatably connected to the surface of the mounting shell 28, the other end of the connecting shaft is provided with a forward and reverse motor 34, the power output end of the forward and reverse motor 34 is fixedly connected to the connecting shaft, the forward and reverse motor 34 is fixedly connected to the surface of the mounting shell 28, and the forward and reverse motor 34 is rotated when the forward and reverse motor 34 rotates. When the machine 34 rotates, the second bevel gear 33 can be driven to rotate through the connecting shaft, and the exhaust fan 30 can be driven to rotate under the meshing of the second bevel gear 33 and the first bevel gear 32, thereby playing the role of sucking and pushing the gas; the forward and reverse motor 34 is electrically connected to the detector 31, and the forward and reverse rotation of the forward and reverse motor 34 is controlled by the detector 31. When the forward and reverse motor 34 rotates forward, it drives the exhaust fan 30 to rotate upward to draw air. When the detector 31 detects that the gas does not meet the standard, the forward and reverse motor 34 can be controlled to reverse, driving the exhaust fan 30 to rotate in the opposite direction to push the gas downward; the lower end of the first connecting pipe 23 is fixedly connected to a collecting plate 24, which is used to expand the range of the gas inlet and increase the suction effect.

[0040] The corresponding two sides of the circumferential surface of the sealing cover 2 are fixedly connected with toothed plates 37 respectively, and the outer sides of the toothed plates 37 are respectively meshed with transmission gears 38. The front and rear ends of the transmission gear 38 are respectively rotatably connected with support plates 36. The lower end of the support plate 36 is fixedly connected to the outer cylinder 1. The outer sides of the transmission gear 38 are respectively meshed with control gears 39. The two ends of the control gear 39 are respectively rotatably connected to the support plate 36. The two ends of the control gear 39 are respectively fixedly connected with side plates 48. The other ends of the two side plates 48 are fixedly connected with handles 40. A protective shell 47 is fixedly connected between the two support plates 36. The protective cover covers the structure between the two side plates 48 and is used to protect the control gear 39 and the transmission gear 38 between the two side plates 48. The control gear 39 can be driven to rotate by swinging the control handle 40 downward, and then the toothed plate 37 is driven to move downward under the transmission of the transmission gear 38, thereby driving the sealing cover 2 to move downward. The transmission gear 38 is used to change the transmission direction, so that the handle 40 can drive the sealing cover 2 downward by swinging downward, and it is convenient to apply force when the handle 40 swings downward.

[0041] One of the support plates 36 is fixedly connected to a ratchet 41, which is coaxially arranged with the transmission gear 38. A ratchet block 42 is meshed on the upper side of the ratchet 41. When the ratchet block 42 is meshed with the ratchet 41, the handle 40 can only swing downward in one direction. A handle 43 is fixedly connected to the upper end of the ratchet block 42. A slider 44 is fixedly connected to the surface of the ratchet block 42. A slide groove 45 is provided on the surface of the support plate 36 corresponding to the slide groove 44. The slide groove 45 is slidably connected to the slide groove 45. The upper end of the slide block 44 is fixedly connected to The meshing spring 46 has the other end fixedly connected to the slide groove 45. The meshing spring 46 can push the ratchet block 42 to keep meshing with the ratchet 41. When removing the sealing cover 2, the handle 43 can be hooked with a finger to drive the ratchet block 42 to disengage from the ratchet 41. At this time, the handle 40 can be swung upward to drive the sealing cover 2 to be removed. An elastic sealing gasket is fixedly connected to the inside of the sealing cover 2, which can further improve the sealing performance of the device when installing the sealing cover 2, thereby avoiding gas leakage.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A detection device for food-grade carbon dioxide, comprising an outer cylinder (1), characterized in that: A detachable inner cylinder (3) is installed inside the outer cylinder (1), a detachable sealing cover (2) is installed on the upper end of the outer cylinder (1), an air guide pipe (20) is fixedly connected to a non-central position of the upper end of the outer cylinder (1), the lower end of the air guide pipe (20) extends to the bottom end of the inner cylinder (3), a first connecting pipe (23) is fixedly connected to the middle of the sealing cover (2), the lower end of the first connecting pipe (23) extends to the upper side of the inner cylinder (3) and the lower end of the first connecting pipe (23) is fixedly connected to an air intake check valve (26), and the surface of the first connecting pipe (23) is fixedly connected and connected to the air intake check valve (26). There is a transition pipe (25), the other end of which is fixedly connected to a gas outlet check valve (27), the other end of which is fixedly connected to and communicated with the gas guide pipe (20), the upper end of the first connecting pipe (23) is provided with a gas extraction component capable of extracting and pushing gas, the surface of the first connecting pipe (23) at the lower side of the gas extraction component is provided with a detector (31) for detecting the gas inside the first connecting pipe (23), and during the gas extraction process of the gas extraction component, when the gas does not meet the standard of the detector (31), the detector (31) can control the gas extraction component to push gas.

2. A detection device for food-grade carbon dioxide according to claim 1, characterized in that: An annular tube (21) is arranged on the lower inner side of the inner tube (3); the lower end of the air guide tube (20) is fixedly connected to and communicates with the annular tube (21); and a plurality of air outlet holes (22) are provided on the surface of the annular tube (21).

3. A detection device for food-grade carbon dioxide as claimed in claim 2, characterized in that: A plurality of detachable placement plates (9) are installed inside the inner cylinder (3). The plurality of placement plates (9) are evenly arranged vertically inside the inner cylinder (3). The surface of the placement plates (9) is provided with a plurality of arc holes (11) in a ring shape with the center of the placement plates (9) as the axis. Filter pads (49) are respectively placed on the upper ends of the placement plates (9). The surfaces of the filter pads (49) are provided with a plurality of mounting holes (14) distributed in a ring shape. The upper ends of the placement plates (9) are fixedly connected with a plurality of limiting shafts (13) distributed in a ring shape and arranged coaxially with the mounting holes (14). When the filter pads (49) are placed on the placement plates (9), the limiting shafts (13) can be inserted into the mounting holes (14).

4. A detection device for food-grade carbon dioxide as claimed in claim 3, characterized in that: The inner cylinder (3) has two corresponding sides of the upper end thereof respectively provided with connecting vertical grooves (7) downwardly, and the surface of the connecting vertical grooves (7) is provided with a plurality of vertically arranged arc-shaped clamping grooves (8), and the corresponding sides of the circumferential surface of the placement plate (9) are respectively fixedly connected with clamping plates (10) which can be slidably matched with the connecting vertical grooves (7) and the arc-shaped clamping grooves (8), and when the placement plate (9) is placed in the inner cylinder (3), the clamping plates (10) can be clamped inside the arc-shaped clamping grooves (8).

5. A detection device for food-grade carbon dioxide as claimed in claim 3, characterized in that: The middle part of the upper end of the placement plate (9) is fixedly connected to a mounting tube (15), the upper end of the mounting tube (15) is vertically slidably connected to a pressure rod (16) that can move up and down, one end of the pressure rod (16) extending into the interior of the mounting tube (15) is fixedly connected to a slide plate (18), the slide plate (18) is slidably connected to the interior of the mounting tube (15), the lower end of the slide plate (18) is fixedly connected to a support spring (17), the lower end of the support spring (17) is slidably connected to the interior of the mounting tube (15), The lower end is fixedly connected, a through hole for the installation cylinder (15) to pass through is opened in the middle of the filter pad (49), and a groove (19) is opened in the middle of the lower end of the placement plate (9). When the placement plates (9) are overlapped and placed, the upper end of the pressure rod (16) is pressed against the groove (19). When the upper placement plate (9) is installed, the lower pressure rod (16) is squeezed, so that the lower pressure rod (16) moves toward the inside of the placement cylinder, and then the support spring (17) is compressed by the slide plate (18).

6. A detection device for food-grade carbon dioxide according to claim 1, characterized in that: The corresponding two sides of the circumferential surface of the inner cylinder (3) are respectively fixedly connected with vertically arranged limiting protrusions (5), and the corresponding two sides inside the outer cylinder (1) are respectively provided with limiting grooves (6). After the inner cylinder (3) is installed in the outer cylinder (1), the limiting protrusions (5) and the limiting grooves (6) are slidably matched, and the bottom of the inner cylinder (3) is rotatably connected with an auxiliary ring (4), and the auxiliary ring (4) is threadedly connected to the bottom of the outer cylinder (1).

7. A detection device for food-grade carbon dioxide according to claim 1, characterized in that: The air extraction component comprises a mounting shell (28) fixedly connected to the upper end of the first connecting pipe (23); the upper end of the mounting shell (28) is fixedly connected and connected to a second connecting pipe (29); an exhaust fan (30) is rotatably connected inside the mounting shell (28); a first bevel gear (32) is coaxially fixedly connected to the bottom of the exhaust fan (30); a second bevel gear (33) is meshed on the lower side of the first bevel gear (32); a connecting shaft is fixedly connected to the middle of the second bevel gear (33); the connecting shaft is rotatably connected to the surface of the mounting shell (28); the other end of the connecting shaft is A forward and reverse motor (34) is provided, the power output end of the forward and reverse motor (34) is fixedly connected to the connecting shaft, and the forward and reverse motor (34) is fixedly connected to the surface of the mounting shell (28); the forward and reverse motor (34) is electrically connected to the detector (31), and the forward and reverse rotation of the forward and reverse motor (34) is controlled by the detector (31). When the forward and reverse motor (34) rotates forward, it drives the exhaust fan (30) to rotate upward to draw air; when the detector (31) detects that the gas does not meet the standard, it can control the forward and reverse motor (34) to reverse, driving the exhaust fan (30) to rotate in the reverse direction to push the gas downward.

8. A detection device for food-grade carbon dioxide according to claim 1, characterized in that: The lower end of the first connecting pipe (23) is fixedly connected to a collecting tray (24).

9. A detection device for food-grade carbon dioxide according to claim 1, characterized in that: The sealing cover (2) is fixedly connected to toothed plates (37) on two corresponding sides of the circumferential surface, and the outer sides of the toothed plates (37) are respectively meshed with transmission gears (38). The front and rear ends of the transmission gear (38) are rotatably connected to support plates (36). The lower end of the support plate (36) is fixedly connected to the outer cylinder (1). The outer sides of the transmission gear (38) are respectively meshed with control gears (39). The two ends of the control gear (39) are respectively rotatably connected to the support plate (36). The two ends of the control gear (39) are respectively fixedly connected to side plates (48). The other ends of the two side plates (48) are fixedly connected to handles (40).

10. A detection device for food-grade carbon dioxide according to claim 9, characterized in that: One of the support plates (36) is fixedly connected with a ratchet (41), the ratchet (41) and the transmission gear (38) are coaxially arranged, the upper side of the ratchet (41) is meshed with a ratchet block (42), and the handle (40) can only swing downward in one direction when the ratchet block (42) is meshed with the ratchet (41), and the upper end of the ratchet block (42) is fixedly connected with a handle (43); a sliding block (44) is fixedly connected to the surface of the ratchet block (42), and a sliding groove (45) is provided on the surface of the support plate (36) corresponding to the sliding block (44), the sliding block (44) is slidably connected to the sliding groove (45), and an engagement spring (46) is fixedly connected to the upper end of the sliding block (44), and the other end of the engagement spring (46) is fixedly connected to the sliding groove (45).

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