Fruit pesticide residue detection device and use method thereof

Abstract

The invention relates to the technical field of pesticide residue detection, in particular to a fruit pesticide residue detection device and a using method thereof.The fruit pesticide residue detection device comprises a pedestal and a collecting mechanism, the collecting mechanism comprises a collecting barrel, the inner side of the collecting barrel is fixedly connected with a collecting hopper, and the bottom end of the collecting hopper is fixedly connected with a circulating pump; the input end of the circulating pump is communicated with the inner side of the bottom end of the collecting hopper, the bottom end of the collecting barrel is fixedly connected with an inlet pipe, the top end of the inlet pipe is communicated with the output end of the circulating pump, and the outer side of the bottom end of the inlet pipe is fixedly connected with an elastic plate which is transversely distributed. A sampling reagent can be directly used for collecting and absorbing surface pesticide residues on the surface of a fruit in a fixed area, so that the detection process can be greatly ensured, the sample quantity collection difference caused by fruit sample difference is reduced, the effective collection quantity is increased, the error caused by neglecting the difference of different fruit peels can be reduced, and the detection accuracy is improved. The accuracy of a fruit detection result is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide residue detection, in particular to a fruit pesticide residue detection device and a use method thereof. Background Art

[0002] Pesticides are important agricultural production materials and play a very important role in preventing and controlling diseases, insects, weeds and rodents in agricultural product production. However, pesticide pollution and the harmful consequences it produces are serious, including pollution of the water environment, soil and atmosphere, impacts on environmental organisms and harm to human health.

[0003] At present, there are many methods for detecting pesticide residues, such as liquid chromatography and rapid test strips. However, no matter which method is used for detection, it is necessary to face the early sampling stage;

[0004] For sampling of vegetables, since vegetables have a large specific surface area, they can be weighed. However, for spherical fruits, the peel of the fruit is generally tested. Due to the inconsistent thickness of the peel of each fruit, the different curvature of the fruit surface and the difference in the water content of the fruit peel, the peel thickness will inevitably be different, and there will be a large error in the effective sample size. This difference will greatly interfere with the results of pesticide residue detection. For example, there are large differences in the peels of oranges and apples. In addition, for spherical fruits, during the process of pesticide spraying, the distribution of pesticides on their surface is very uneven due to the existence of windward and leeward sides. The sample data collected by peeling is too concentrated and cannot reflect the overall amount of pesticide residues on the surface of spherical fruits.

[0005] The present invention provides a fruit pesticide residue detection device and a use method thereof, wherein a sampling reagent is directly placed on the surface of a fruit to collect and absorb the surface pesticide residue in a fixed area, which can greatly ensure that during the detection process, the differences in sample quantity collection caused by differences in fruit samples are reduced, and the errors caused by differences in the peels of different fruits can be reduced or even ignored, thereby ensuring the accuracy of the fruit detection results. Summary of the invention

[0006] The object of the present invention is to provide a fruit pesticide residue detection device and a method for using the same, wherein a sampling reagent is directly placed on the surface of a fruit to collect and absorb the surface pesticide residues in a fixed area, which can greatly reduce the differences in sample quantity collection caused by differences in fruit samples during the detection process, and can reduce or even ignore the errors caused by differences in the peels of different fruits, thereby ensuring the accuracy of the fruit detection results.

[0007] To achieve the above object, the present invention provides the following technical solutions: a fruit pesticide residue detection device, comprising a pedestal and a collection mechanism, the collection mechanism comprising a collection cylinder, the inner side of the collection cylinder is fixedly connected to a collection bucket, the bottom end of the collection bucket is fixedly connected to a circulation pump, the input end of the circulation pump is connected to the inner side of the bottom end of the collection bucket, the bottom end of the collection cylinder is fixedly connected to an inlet pipe, the top end of the inlet pipe is connected to the output end of the circulation pump;

[0008] The outer side of the bottom end of the inlet pipe is fixedly connected with a laterally distributed elastic plate, the left and right ends of the elastic plate are fixedly connected with a connecting block, the front and rear sides of the elastic plate are fixedly connected with a plurality of evenly distributed support rods, the front and rear sides of the elastic plate are fixedly connected with an elastic closing cloth for achieving a sealing effect, the elastic closing cloths at both ends are fixedly connected with the connecting block, the elastic closing cloth in the middle area is fixedly connected with two adjacent support rods, the bottom ends of the support rods and the connecting block are fixedly connected with a filling piece, the filling piece can be in interference contact with the surface of the spherical fruit, the filling piece is also fixedly connected with the bottom end of the elastic closing cloth, and a collection space is formed between the filling piece, the elastic closing cloth, the connecting block and the elastic plate;

[0009] In the present invention, all components in the support mechanism that come into contact with the sampling reagent, such as the inner sides of the suction tube and the collecting tube, are coated with a hydrophobic layer to reduce the residual sampling reagent in the support mechanism.

[0010] The elastic plate is provided with a through hole for gas to enter, the top of the collecting cylinder is connected with an air outlet cylinder, the inner side of the air outlet cylinder is fixedly connected with a negative pressure fan, when the negative pressure fan and the circulating pump are working, the circulating pump can pump the sampling reagent into the collecting space, and after fully contacting with the spherical fruit, the negative pressure generated by the negative pressure fan flows back to the collecting bucket again, so as to realize the fixed area collection of pesticides on the surface of the spherical fruit.

[0011] Through the present invention, the sampling reagent can be directly placed on the surface of the fruit to collect and absorb the pesticide residues on the surface in a fixed area, which can greatly ensure that the differences in sample quantity collection caused by differences in fruit samples are reduced during the detection process, increase the effective collection amount, and reduce or even ignore the errors caused by differences in the peels of different fruits, thereby ensuring the accuracy of the fruit detection results.

[0012] As a preferred fruit pesticide residue detection device of the present invention, a notch is provided on the inner side of the connecting block, a suction tube is fixedly connected to the inner side of the connecting block, the top end of the suction tube is connected to a hose, the inner side of the top end of the collecting cylinder is also connected to a liquid return pipe, the other end of the liquid return pipe is connected to the top end of the hose, and when the negative pressure fan is working, the sampling reagent in the collection space can flow back to the collecting bucket through the notch, the suction tube, the hose and the liquid return pipe.

[0013] As a preferred fruit pesticide residue detection device of the present invention, in an initial state, both ends of the elastic plate are bent downward, and a fixing rod is fixedly connected to the outer side of the inlet pipe, and the fixing rod is arranged directly above the elastic plate. The bottom end of the fixing rod is rotatably connected to an electric push rod through a hinge, and the bottom end of the electric push rod is rotatably connected to the middle position of one side of the elastic plate through a hinge. The filling piece is closely fitted to the surface of the spherical fruit through the downward bending of the elastic plate and the downward pressure provided by the electric push rod.

[0014] Before the collection mechanism works, the drainage cap is opened, the sampling reagent is added, and the drainage cap is closed again. When the collection mechanism in the present invention works, the collection mechanism is first placed from top to bottom on the upper surface of the spherical fruit, and then the electric push rod is controlled to extend, and the filling piece is closely fitted to the surface of the spherical fruit through the downward bending of the elastic plate and the downward pressure provided by the electric push rod. During the pressing process, because the annular length of the filling piece is fixed, the surface area of ​​the fruit collected in a single sampling process will be close to the same in multiple sampling and collection processes, thereby greatly unifying the effective sample volume obtained by sampling and increasing the accuracy of detection compared to the prior art that uses weighing as the sampling standard;

[0015] After the downward pressure is completed, the collection begins. The circulating pump first works for a period of time. When the sampling reagent has a height in the collection space that exceeds the bottom of the vibrator, the negative pressure fan starts to work. During the collection process, the height of the sampling reagent in the collection space is maintained to exceed the bottom of the vibrator. The vibrator is used to increase the effect of pesticide collection. The vibrator can be an ultrasonic vibrator. The collection tube can be made of transparent material to observe the distribution of the sampling reagent in the collection mechanism.

[0016] After collecting for a period of time, the circulation pump is controlled to be closed, and the negative pressure fan is controlled to work for several minutes to concentrate the sampling reagent in the collection bucket, and then the spherical fruit is rotated to perform multi-point annular distribution sampling, and then the sampling reagent is exported by opening the drainage cap to complete the overall sampling.

[0017] This sampling method can also avoid the problem of uneven distribution of pesticides on the surface of spherical fruits, further increasing the accuracy of subsequent testing;

[0018] As a preferred fruit pesticide residue detection device of the present invention, an embedding block is embedded on the inner side of the elastic plate, and a flexible member is fixedly connected to the bottom end of the embedding block, and the flexible member is used to block the transmission of vibration. A vibrator is fixedly connected to the bottom end of the flexible member. After the circulating pump works for a period of time, the negative pressure fan starts to work after the sampling reagent has a height in the collection space and exceeds the bottom end of the vibrator. During the collection process, the sampling reagent is maintained at a height in the collection space that exceeds the bottom end of the vibrator. The vibrator is used to increase the effect of pesticide collection.

[0019] As a preferred embodiment of the fruit pesticide residue detection device of the present invention, the filling piece is soft rubber or an air bag.

[0020] As a preferred fruit pesticide residue detection device of the present invention, the front end of the collecting tube is threadedly connected with a drainage cap, and the drainage cap is arranged at the bottom end of the collecting bucket. After the circulating pump is turned off, the negative pressure fan is controlled to work for several minutes to concentrate the sampling reagent in the collecting bucket, and then the sampling reagent is discharged by opening the drainage cap.

[0021] As a preferred fruit pesticide residue detection device of the present invention, two support plates are arranged on the top of the pedestal, the support plate on the left is fixedly connected to the pedestal, a slide groove is provided on the inner side of the right end of the pedestal, a slider is slidably connected to the inner side of the slide groove, the top of the slider is fixedly connected to the bottom end of the support plate on the right side, the top ends of the two support plates are rotatably connected to top plates, and the spherical fruits are clamped by the two top plates.

[0022] As a preferred fruit pesticide residue detection device of the present invention, the inner side of the slide groove is fixedly connected to a limit rod, the outer side of the limit rod is slidably connected to the inner side of the slider, the outer side of the limit rod is provided with a tension spring, the two ends of the tension spring are respectively fixedly connected to the inner side of the slide groove and the inner side of the slider, the right side top plate is clamped to the spherical fruit by the tension spring, and one end of the top plate is fixedly connected to an insertion rod for increasing the anchoring force to the spherical fruit.

[0023] As a preferred fruit pesticide residue detection device of the present invention, the right end of the right support plate is fixedly connected to a motor, and the end of the main shaft of the motor is fixedly connected to the rotating shaft of the right top plate.

[0024] The method for using the fruit pesticide residue detection device comprises the following steps:

[0025] Step 1: Clamp the spherical fruit between two top plates;

[0026] Step 2: placing the collection mechanism on the upper end of the spherical fruit to collect samples;

[0027] Step 3: The motor works and repeats the steps in step 2 every time it rotates 60°;

[0028] Step 4: The collection agency collects six times in total to complete the overall sampling of spherical fruits;

[0029] Step 5: After the last sampling is completed, the sampling reagent is discharged by opening the drainage cap.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The fruit pesticide residue detection device can collect and absorb the surface pesticide residues directly on the surface of the fruit with a fixed area by using the sampling reagent, which can greatly ensure that the difference in sample quantity collection caused by the difference in fruit samples is reduced during the detection process, increase the effective collection amount, reduce or even ignore the error caused by the difference in the peels of different fruits, and ensure the accuracy of the fruit detection results.

[0032] 2. In the fruit pesticide residue detection device, before the collection mechanism works, the drainage cap is opened, the sampling reagent is added, and the drainage cap is closed again. When the collection mechanism in the present invention works, the collection mechanism is first placed from top to bottom on the upper surface of the spherical fruit, and then the electric push rod is controlled to extend, and the filling piece is closely fitted to the surface of the spherical fruit through the downward bending of the elastic plate and the downward pressure provided by the electric push rod. During the pressing process, because the annular length of the filling piece is fixed, the surface area of ​​the fruit collected in a single sampling process will be close to the same during multiple sampling and collection processes. Therefore, compared with the prior art that uses weighing as the sampling standard, the effective sample amount obtained by sampling can be greatly unified, and the accuracy of detection can be increased.

[0033] 3. This fruit pesticide residue detection device starts collecting after the downward pressure is completed. The circulating pump first works for a period of time. After the sampling reagent has a height in the collection space and exceeds the bottom of the vibrator, the negative pressure fan starts to work. During the collection process, the sampling reagent is maintained at a height in the collection space exceeding the bottom of the vibrator. The vibrator is used to increase the effect of pesticide collection. The vibrator can be an ultrasonic vibrator. The collection tube can be made of transparent material to observe the distribution of the sampling reagent in the collection mechanism.

[0034] 4. This fruit pesticide residue detection device, after collecting for a period of time, controls the circulation pump to close, controls the negative pressure fan to work for several minutes, concentrates the sampling reagent in the collection bucket, then rotates the spherical fruit, performs multi-point annular distribution sampling, and then opens the drainage cap to realize the extraction of the sampling reagent to complete the overall sampling. This sampling method can also avoid the problem of uneven distribution of pesticides on the surface of the spherical fruit, and further increase the accuracy of the subsequent detection process.

[0035] 5. A limit rod is fixedly connected to the inner side of the slide, and the outer side of the limit rod is slidably connected to the inner side of the slider. A tension spring is arranged on the outer side of the limit rod, and the two ends of the tension spring are respectively fixedly connected to the inner side of the slide and the inner side of the slider. The right-side top plate clamps the spherical fruit through the tension spring, and one end of the top plate is fixedly connected to a plug rod for increasing the anchoring force on the spherical fruit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of a spherical fruit in reality;

[0037] Figure 2 It is a schematic diagram of the overall cross-sectional installation structure of the present invention;

[0038] Figure 3 For the present invention Figure 2 A schematic diagram of the structure at A;

[0039] Figure 4 It is a schematic diagram of the appearance structure of the collection mechanism of the present invention;

[0040] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at B in FIG.

[0041] Figure 6 It is a cross-sectional structural schematic diagram of the collection mechanism of the present invention;

[0042] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at C;

[0043] Figure 8 For the present invention Figure 6 Schematic diagram of the structure at D;

[0044] Fig. 9 It is a schematic diagram of the bending of the elastic plate of the present invention in the initial state;

[0045] Fig.10 This is a schematic diagram of the appearance structure of the top plate of the present invention;

[0046] Fig.11 It is a schematic diagram of the appearance structure of the base of the present invention.

[0047] In the figure: 1. spherical fruit; 2. pedestal; 3. support plate; 4. slider; 5. limit rod; 6. motor; 7. top plate; 71. insertion rod; 8. collection mechanism; 9. tension spring;

[0048] 81. Collecting tube; 82. Negative pressure fan; 83. Collecting bucket; 84. Circulating pump; 85. Inlet pipe; 86. Liquid return pipe; 87. Fixing rod; 88. Hose; 89. Suction tube; 810. Connecting block; 811. Notch; 812. Filling piece; 813. Support rod; 814. Elastic sealing cloth; 815. Electric push rod; 816. Through hole; 817. Elastic plate; 818. Embedded block; 819. Flexible piece; 820. Vibrator; 821. Collecting space; 822. Air outlet tube; 823. Liquid drainage. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example 1, please refer to Figure 1-9 The present invention provides a technical solution: a fruit pesticide residue detection device, comprising a pedestal 2 and a collection mechanism 8, the collection mechanism 8 comprising a collection cylinder 81, the inner side of the collection cylinder 81 is fixedly connected with a collection bucket 83, the bottom end of the collection bucket 83 is fixedly connected with a circulation pump 84, the input end of the circulation pump 84 is connected with the inner side of the bottom end of the collection bucket 83, the bottom end of the collection cylinder 81 is fixedly connected with an inlet pipe 85, the top end of the inlet pipe 85 is connected with the output end of the circulation pump 84;

[0051] A laterally distributed elastic plate 817 is fixedly connected to the outer side of the bottom end of the inlet pipe 85, and a connecting block 810 is fixedly connected to the left and right ends of the elastic plate 817. A plurality of evenly distributed support rods 813 are fixedly connected to the front and rear sides of the elastic plate 817, and an elastic sealing cloth 814 for achieving a sealing effect is fixedly connected to the front and rear sides of the elastic plate 817. The elastic sealing cloth 814 at both ends is fixedly connected to the connecting block 810, and the elastic sealing cloth 814 in the middle area is fixedly connected to two adjacent support rods 813. The bottom ends of the support rods 813 and the connecting block 810 are fixedly connected with a filling piece 812, and the filling piece 812 can be in interference contact with the surface of the spherical fruit 1. The filling piece 812 is also fixedly connected to the bottom end of the elastic sealing cloth 814, and a collection space 821 is formed between the filling piece 812, the elastic sealing cloth 814, the connecting block 810 and the elastic plate 817;

[0052] The elastic plate 817 is provided with a through hole 816 for gas to enter, the top of the collecting tube 81 is connected to an air outlet tube 822, and the inner side of the air outlet tube 822 is fixedly connected to a negative pressure fan 82. When the negative pressure fan 82 and the circulating pump 84 are working, the circulating pump 84 can pump the sampling reagent into the collecting space 821. After fully contacting the spherical fruit 1, the negative pressure generated by the negative pressure fan 82 flows back to the collecting bucket 83 again, thereby realizing the fixed area collection of pesticides on the surface of the spherical fruit 1.

[0053] In the present invention, all components in the support mechanism 8 that come into contact with the sampling reagent, such as the inner sides of the suction tube 89 and the collecting tube 81 , are coated with a hydrophobic layer to reduce the residual sampling reagent in the support mechanism 8 .

[0054] Through the present invention, the sampling reagent can be directly placed on the surface of the fruit to collect and absorb the pesticide residues on the surface in a fixed area, which can greatly ensure that the differences in sample quantity collection caused by differences in fruit samples are reduced during the detection process, and the errors caused by differences in the peels of different fruits can be reduced or even ignored, thereby ensuring the accuracy of the fruit detection results.

[0055] In the present embodiment, specifically, a notch 811 is provided on the inner side of the connecting block 810, a suction tube 89 is fixedly connected to the inner side of the connecting block 810, the top end of the suction tube 89 is connected to a hose 88, the top inner side of the collecting tube 81 is also connected to a liquid return tube 86, the other end of the liquid return tube 86 is connected to the top end of the hose 88, when the negative pressure fan 82 is working, the sampling reagent in the collection space 821 can flow back to the collecting bucket 83 through the notch 811, the suction tube 89, the hose 88 and the liquid return tube 86.

[0056] In the present embodiment, specifically, in the initial state, both ends of the elastic plate 817 are bent downward, and a fixing rod 87 is fixedly connected to the outer side of the inlet pipe 85, and the fixing rod 87 is arranged directly above the elastic plate 817. The bottom end of the fixing rod 87 is rotatably connected to the electric push rod 815 through a hinge, and the bottom end of the electric push rod 815 is rotatably connected to the middle position of one side of the elastic plate 817 through a hinge. The downward bending of the elastic plate 817 and the downward pressure provided by the electric push rod 815 make the filling piece 812 fit tightly against the surface of the spherical fruit 1.

[0057] Before the collection mechanism 8 works, the drainage cap 823 is opened, the sampling reagent is added, and the drainage cap 823 is closed again. When the collection mechanism 8 in the present invention works, the collection mechanism 8 is first placed from top to bottom on the upper surface of the spherical fruit 1, and then the electric push rod 815 is controlled to extend, and the filling piece 812 is tightly fitted with the surface of the spherical fruit 1 through the downward bending of the elastic plate 817 and the downward pressure provided by the electric push rod 815. During the pressing process, because the annular length of the filling piece 812 is fixed, the surface area of ​​the fruit collected in a single time will be close to the same during multiple sampling and collection processes, thereby greatly unifying the effective sample volume obtained by sampling and increasing the accuracy of detection compared to the prior art of using weighing as the sampling standard;

[0058] After the downward pressure is completed, the collection starts. The circulation pump 84 works for a period of time. After the sampling reagent is stored in the collection space 821 and exceeds the bottom of the vibrator 820, the negative pressure fan 82 starts to work. During the collection process, the height of the sampling reagent in the collection space 821 is maintained to exceed the bottom of the vibrator 820. The vibrator 820 is used to increase the effect of pesticide collection. The vibrator 820 can be an ultrasonic vibrator. The collection tube 81 can be made of transparent material to observe the distribution of the sampling reagent in the collection mechanism.

[0059] After collecting for a period of time, the circulation pump 84 is controlled to be turned off, and the negative pressure fan 82 is controlled to work for several minutes, and then the sampling reagent is discharged by opening the drain cap 823 to complete the overall sampling.

[0060] In this embodiment, specifically, an embedding block 818 is embedded on the inner side of the elastic plate 817, and a flexible member 819 is fixedly connected to the bottom end of the embedding block 818. The flexible member 819 is used to block the transmission of vibration. The vibrator 820 is fixedly connected to the bottom end of the flexible member 819. The circulating pump 84 first works for a period of time, and then the negative pressure fan 82 starts to work after the sampling reagent has a height in the collection space 821 and exceeds the bottom end of the vibrator 820. During the collection process, the sampling reagent is maintained at a height in the collection space 821 that exceeds the bottom end of the vibrator 820. The vibrator 820 is used to increase the effect of pesticide collection.

[0061] In this embodiment, specifically, the filling member 812 is soft rubber or an air bag.

[0062] In the present embodiment, specifically, the front end of the collecting tube 81 is threadedly connected with a drain cap 823, and the drain cap 823 is arranged at the bottom end of the collecting bucket 83. After the circulating pump 84 is turned off, the negative pressure fan 82 is controlled to work for several minutes to concentrate the sampling reagent in the collecting bucket 83, and then the sampling reagent is discharged by opening the drain cap 823.

[0063] Example 2: This example is a further improvement of Example 1. Figure 1-11 Two support plates 3 are arranged at the top of the pedestal 2, the left support plate 3 is fixedly connected to the pedestal 2, a slide groove is opened on the inner side of the right end of the pedestal 2, a slider 4 is slidably connected to the inner side of the slide groove, the top of the slider 4 is fixedly connected to the bottom end of the right support plate 3, and the top ends of the two support plates 3 are rotatably connected to top plates 7, and the spherical fruit 1 is clamped by the two top plates 7.

[0064] In the present embodiment, specifically, the inner side of the slide groove is fixedly connected with a limit rod 5, the outer side of the limit rod 5 is slidably connected with the inner side of the slider 4, the outer side of the limit rod 5 is provided with a tension spring 9, the two ends of the tension spring 9 are respectively fixedly connected with the inner side of the slide groove and the inner side of the slider 4, and the right side top plate 7 is clamped on the spherical fruit 1 by the tension spring 9, and one end of the top plate 7 is fixedly connected with an insertion rod 71 for increasing the anchoring force on the spherical fruit 1.

[0065] In this embodiment, specifically, the right end of the right support plate 3 is fixedly connected with the motor 6, and the main shaft end of the motor 6 is fixedly connected to the rotating shaft of the right top plate 7.

[0066] After a single sampling is completed, the spherical fruit 1 is rotated to perform multi-point annular distribution sampling, and then the sampling reagent is discharged by opening the drainage cap 823 to complete the overall sampling. This sampling method can also avoid the problem of uneven distribution of pesticides on the surface of the spherical fruit 1, and further increase the accuracy of subsequent detection processes.

[0067] The present invention also discloses a method for using the fruit pesticide residue detection device, the steps of which are:

[0068] Step 1: clamp the spherical fruit 1 between two top plates 7;

[0069] Step 2: placing the collecting mechanism 8 on the upper end of the spherical fruit 1 to collect samples;

[0070] Step 3: The motor 6 works, and the steps in step 2 are repeated every time it rotates 60°;

[0071] Step 4: The collecting mechanism 8 collects six times in total to complete the overall sampling of the spherical fruit 1;

[0072] Step 5: After the last sampling is completed, the sampling reagent is discharged by opening the drain cap 823.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting pesticide residues in fruits, comprising a base (2) and a collection mechanism (8), characterized in that: The collecting mechanism (8) comprises a collecting cylinder (81), the inner side of the collecting cylinder (81) is fixedly connected to a collecting bucket (83), the bottom end of the collecting bucket (83) is fixedly connected to a circulating pump (84), the input end of the circulating pump (84) is connected to the inner side of the bottom end of the collecting bucket (83), the bottom end of the collecting cylinder (81) is fixedly connected to an inlet pipe (85), the top end of the inlet pipe (85) is connected to the output end of the circulating pump (84); The outer side of the bottom end of the inlet pipe (85) is fixedly connected to a laterally distributed elastic plate (817), the left and right ends of the elastic plate (817) are fixedly connected to a connecting block (810), the front and rear sides of the elastic plate (817) are fixedly connected to a plurality of evenly distributed support rods (813), the front and rear sides of the elastic plate (817) are fixedly connected to an elastic sealing cloth (814) for achieving a sealing effect, the elastic sealing cloths (814) at both ends are fixedly connected to the connecting block (810), and the elastic sealing cloths (814) at the middle area are fixedly connected to the connecting block (810). The elastic sealing cloth (814) is fixedly connected to two adjacent support rods (813); the bottom ends of the support rods (813) and the connecting block (810) are fixedly connected with a filling piece (812); the filling piece (812) can be in interference contact with the surface of the spherical fruit (1); the filling piece (812) is also fixedly connected to the bottom end of the elastic sealing cloth (814); a collection space (821) is formed between the filling piece (812), the elastic sealing cloth (814), the connecting block (810) and the elastic plate (817); The elastic plate (817) is provided with a through hole (816) for gas to enter, the top end of the collecting tube (81) is connected to an air outlet tube (822), the inner side of the air outlet tube (822) is fixedly connected to a negative pressure fan (82), when the negative pressure fan (82) and the circulating pump (84) are working, the circulating pump (84) can pump the sampling reagent into the collecting space (821), after the negative pressure is fully in contact with the spherical fruit (1), the negative pressure generated by the negative pressure fan (82) flows back to the collecting bucket (83) again, so as to realize the fixed area collection of pesticides on the surface of the spherical fruit (1).

2. A fruit pesticide residue detection device according to claim 1, characterized in that: A notch (811) is provided on the inner side of the connection block (810), a suction tube (89) is fixedly connected to the inner side of the connection block (810), the top end of the suction tube (89) is connected to a hose (88), the inner side of the top end of the collection cylinder (81) is also connected to a liquid return tube (86), the other end of the liquid return tube (86) is connected to the top end of the hose (88), when the negative pressure fan (82) is working, the sampling reagent in the collection space (821) can flow back to the collection bucket (83) through the notch (811), the suction tube (89), the hose (88) and the liquid return tube (86).

3. A fruit pesticide residue detection device according to claim 2, characterized in that: In the initial state, both ends of the elastic plate (817) are bent downward, and a fixing rod (87) is fixedly connected to the outer side of the inlet pipe (85), and the fixing rod (87) is arranged directly above the elastic plate (817). The bottom end of the fixing rod (87) is rotatably connected to an electric push rod (815) through a hinge, and the bottom end of the electric push rod (815) is rotatably connected to the middle position of one side of the elastic plate (817) through a hinge. The filling piece (812) is tightly fitted to the surface of the spherical fruit (1) by the downward bending of the elastic plate (817) and the downward pressure provided by the electric push rod (815).

4. A fruit pesticide residue detection device according to claim 3, characterized in that: An embedding block (818) is embedded inside the elastic plate (817), and a flexible member (819) is fixedly connected to the bottom end of the embedding block (818), and a vibrator (820) is fixedly connected to the bottom end of the flexible member (819). After the circulating pump (84) works for a period of time, the negative pressure fan (82) starts to work after the sampling reagent has a height in the collection space (821) exceeding the bottom end of the vibrator (820). During the collection process, the sampling reagent is maintained at a height in the collection space (821) exceeding the bottom end of the vibrator (820). The vibrator (820) is used to increase the effect of pesticide collection.

5. A fruit pesticide residue detection device according to claim 4, characterized in that: The filling piece (812) is soft rubber or an air bag.

6. A fruit pesticide residue detection device according to claim 5, characterized in that: The front end of the collecting tube (81) is threadedly connected with a drain cap (823), and the drain cap (823) is arranged at the bottom end of the collecting bucket (83). After the circulating pump (84) is turned off, the negative pressure fan (82) is controlled to work for several minutes to collect the sampling reagent in the collecting bucket (83), and then the sampling reagent is discharged by opening the drain cap (823).

7. A fruit pesticide residue detection device according to any one of claims 1 to 6, characterized in that: Two support plates (3) are arranged at the top of the pedestal (2), the support plate (3) on the left side is fixedly connected to the pedestal (2), a slide groove is provided on the inner side of the right end of the pedestal (2), a slider (4) is slidably connected to the inner side of the slide groove, the top end of the slider (4) is fixedly connected to the bottom end of the support plate (3) on the right side, the top ends of the two support plates (3) are rotatably connected to top plates (7), and the spherical fruit (1) is clamped by the two top plates (7).

8. The device for detecting pesticide residues in fruits according to claim 7, characterized in that: The inner side of the slide groove is fixedly connected with a limit rod (5), the outer side of the limit rod (5) is slidably connected with the inner side of the slider (4), the outer side of the limit rod (5) is provided with a tension spring (9), the two ends of the tension spring (9) are respectively fixedly connected with the inner side of the slide groove and the inner side of the slider (4), and the right top plate (7) is clamped on the spherical fruit (1) by the tension spring (9), and one end of the top plate (7) is fixedly connected with an insertion rod (71) for increasing the anchoring force on the spherical fruit (1).

9. A fruit pesticide residue detection device according to claim 8, characterized in that: The right end of the support plate (3) on the right side is fixedly connected to a motor (6), and the main shaft end of the motor (6) is fixedly connected to the rotating shaft of the top plate (7) on the right side.

10. The method for using the fruit pesticide residue detection device according to claim 9, characterized in that: The steps are: Step 1: clamp the spherical fruit (1) between two top plates (7); Step 2: placing the collection mechanism (8) on the upper end of the spherical fruit (1) to collect samples; Step 3: The motor (6) works, and the steps in step 2 are repeated every time the motor (6) rotates 60°; Step 4: The collecting mechanism (8) collects six times in total to complete the overall sampling of the spherical fruit (1); Step 5: After the last sampling is completed, the sampling reagent is discharged by opening the drainage cap (823).

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