A fruit and vegetable pesticide residue detection pen integrated with sampling and extraction functions

Abstract

The utility model discloses a kind of fruit and vegetable pesticide residue detection pens of integrated sampling extraction function, including detection pen, extraction cavity is arranged at the top end of detection pen, equipment cavity is arranged in the middle of detection pen, detection cavity is arranged in the lower part of detection pen, sampling head is arranged in extraction cavity, buffer solution tank is arranged on the upper side of the outer end of detection pen, buffer solution tank is communicated with extraction cavity, micro pump is arranged in equipment cavity, micro pump input end is communicated with extraction cavity, micro pump output end is communicated with detection cavity, enzyme solution tank and color developing agent tank are arranged on the lower side of the outer end of detection pen, enzyme solution tank and color developing agent tank are communicated with detection cavity, drainage assembly is arranged on the lower side of the rear end of detection pen, drainage assembly is communicated with detection cavity, can integrate sampling, extraction, detection function into one, improve its integrity, convenient to carry.

Description

Technical Field

[0001] This utility model relates to the field of pesticide residue detection technology for fruits and vegetables, and more specifically, it relates to a pesticide residue detection pen for fruits and vegetables that integrates sampling and extraction functions. Background Technology

[0002] The fruit and vegetable pesticide residue testing pen (also known as a "pesticide residue detector" or "rapid testing pen") is a portable, simple device for rapid on-site detection of organophosphate and carbamate pesticide residues on the surface of fruits and vegetables. It uses colorimetry to determine whether pesticide residues exceed the limits. It is easy to operate and suitable for use in homes, farmers' markets, supermarkets, canteens, and other similar settings.

[0003] Users need to manually scrape off the residue on the surface of fruits and vegetables, then transfer them to a buffer solution for extraction, and finally test them using a testing pen.

[0004] The sampling, extraction, and detection functions are performed by different components, resulting in poor overall integration and inconvenience in carrying them. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the problems existing in the prior art, this utility model provides a fruit and vegetable pesticide residue detection pen that integrates sampling and extraction functions, thereby solving the technical problems mentioned in the background art, where sampling, extraction, and detection functions are performed by different components, resulting in poor overall integration and inconvenience in carrying.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A pesticide residue detection pen for fruits and vegetables with integrated sampling and extraction functions includes a detection pen, an extraction chamber at the top of the pen, a device chamber in the middle of the pen, a detection chamber in the lower part of the pen, a sampling head in the extraction chamber, a buffer tank on the upper side of the outer end of the pen, the buffer tank being connected to the extraction chamber, a micro-pump in the device chamber, the input end of the micro-pump being connected to the extraction chamber, the output end of the micro-pump being connected to the detection chamber, an enzyme solution tank and a colorimetric reagent tank on the lower side of the outer end of the pen, both of which are connected to the detection chamber, and a drainage assembly on the lower rear end of the pen, the drainage assembly being connected to the detection chamber.

[0010] The present invention is further configured such that a motor is provided at the right end of the detection pen, and a rotating shaft is rotatably provided inside the extraction chamber. The output end of the motor is connected to the rotating shaft, and multiple sets of stirring blades are provided on the rotating shaft. When it is necessary to extract the residue, the motor is turned on, and the motor drives the rotating shaft to rotate. The rotating shaft drives the multiple sets of stirring blades to rotate, and the multiple sets of stirring blades accelerate the mixing and extraction efficiency of the residue and the buffer solution, thereby speeding up the extraction efficiency of the residue.

[0011] The present invention is further configured such that: a slider is provided on the lower rear side and the lower front side of the outer end of the sampling head; two sets of sliding grooves are provided on the inner wall of the extraction chamber of the detection pen; the two sets of sliders slide within the two sets of sliding grooves; a fixed rod is provided within each set of sliding grooves; the two sets of sliders are slidably connected to the two sets of fixed rods; a spring is fitted on each set of fixed rods; the top end of each set of springs is connected to the bottom end of each set of sliders; the bottom end of each set of springs is connected to the bottom end of each set of sliding grooves; an elastic buckle is provided on the outer end of each set of sliders; a slot is provided on the top of each set of sliding grooves; the elastic buckle and the slot are engaged in a locking action; a cover plate is fitted on the top of the detection pen; two sets of finger grooves are provided on the top of the cover plate; a thread is provided on the upper side of the outer end of the detection pen; and a thread is provided on the inner end of the cover plate. The groove, where the thread engages with the groove, allows for scraping of residue from the surface of fruits and vegetables. When this is necessary, the cover plate is rotated via two sets of finger grooves, opening the cover plate and engaging with the threaded groove on the testing pen. The sampling head, then spring-loaded, moves two sets of sliders upwards, engaging two sets of elastic clips with two sets of slots within the testing pen, thus securing the sampling head. The sampling head then scrapes away the residue from the fruit and vegetable surface. Afterwards, the cover plate is placed on top of the testing pen, separating the two sets of elastic clips from the slots. The cover plate then pushes the sampling head downwards, causing the two sets of sliders to move downwards on two sets of fixed rods. The two sets of springs are compressed. Finally, rotating the cover plate via the finger grooves seals the cover plate with the threaded groove on the testing pen, effectively scraping away residue from the fruit and vegetable surface and sealing the testing pen.

[0012] The present invention is further configured such that an annular groove is provided at the outer end of the cover plate, and an arc-shaped T-shaped slider is slidably mounted on the annular groove. A fixing ring is provided on the upper side of the outer end of the arc-shaped T-shaped slider and the outer end of the detection pen. An anti-loss rope is provided between the two sets of fixing rings. When the cover plate rotates, the arc-shaped T-shaped slider slides on the annular groove. When the cover plate is opened, the cover plate is limited by the anti-loss rope, which can limit the cover plate and prevent it from being lost.

[0013] The present invention is further provided that a base is fitted at the bottom of the detection pen. By setting the base, after sampling the residue on the surface of fruits and vegetables, the detection pen can be placed on the base to support the detection pen during operation and improve the overall stability of the detection pen.

[0014] The present invention is further configured such that the bottom end of the extraction chamber is a conical bottom, and by setting the conical bottom, the extract in the extraction chamber can be completely discharged into the detection chamber.

[0015] The present invention is further configured such that an inspection port is provided at the rear end of the equipment cavity, and an inspection door is rotatably provided at the inspection port. A handle is provided at the outer end of the inspection door, and four sets of locking seats are provided at the outer end of the inspection door. Four sets of latching locks are provided at the rear end of the test pen. The four sets of latching locks cooperate with the four sets of locking seats to lock together. When it is necessary to repair the micro pump, the four sets of latching locks are moved to separate the four sets of latching locks from the four sets of locking seats. Then, the inspection door is opened by the handle, so that the micro pump can be repaired, which facilitates the repair of the micro pump.

[0016] Beneficial effects

[0017] Compared with the prior art, this utility model provides a fruit and vegetable pesticide residue detection pen with integrated sampling and extraction functions, which has the following beneficial effects:

[0018] 1. The testing pen has an extraction chamber at its top, a device chamber in its middle, and a detection chamber at its lower part. A sampling head is located within the extraction chamber. A buffer tank is connected to the extraction chamber. A micro-pump is located within the device chamber, with its input and output connected to the extraction chamber. Both the enzyme solution tank and the chromogenic reagent tank are connected to the detection chamber. Residue on the surface of fruits and vegetables is scraped off using the sampling head. The buffer solution from the buffer tank is then introduced into the extraction chamber of the testing pen, mixing with the residue for extraction. After extraction, the micro-pump is activated, and the extract from the extraction chamber is introduced into the detection chamber of the testing pen. Then, the enzyme solution and chromogenic reagent from the enzyme solution tank and chromogenic reagent tank are introduced into the detection chamber and mixed with the extract for detection. This system integrates sampling, extraction, and detection functions, improving overall functionality and portability.

[0019] 2. A rotating shaft is provided inside the extraction chamber. The output end of the motor is connected to the rotating shaft. Multiple sets of stirring blades are provided on the rotating shaft. When it is necessary to extract the residue, the motor is turned on, and the motor drives the rotating shaft to rotate. The rotating shaft drives the multiple sets of stirring blades to rotate. The multiple sets of stirring blades accelerate the mixing and extraction efficiency of the residue and the buffer solution, which can speed up the extraction efficiency of the residue.

[0020] 3. The two sets of sliders slide within the two sets of sliding grooves. Each set of sliding grooves is equipped with a fixed rod. The two sets of sliders are slidably connected to the two sets of fixed rods. Springs are fitted onto each set of fixed rods. The top ends of the two sets of springs are connected to the bottom ends of the two sets of sliders, and the bottom ends of the two sets of springs are connected to the bottom ends of the two sets of sliding grooves. The two sets of elastic buckles engage with the two sets of buckle slots. The outer upper side of the detection pen has threads, and the inner end of the cover plate has a threaded groove. The threads engage with the threaded grooves. When it is necessary to scrape off residue from the surface of fruits and vegetables, the cover plate is rotated through the two sets of finger grooves, and the cover plate engages with the threads. Open the testing pen, and the sampling head, driven by the rebound of two sets of springs, moves two sets of sliders upward, causing the two sets of elastic buckles to engage with the two sets of slots inside the testing pen, thus fixing the sampling head. Then, the sampling head scrapes away residues on the surface of fruits and vegetables. Next, the cover plate is placed on the top of the testing pen, and the two sets of elastic buckles separate from the two sets of slots. The cover plate then pushes the sampling head downward, and the two sets of sliders move downward on the two sets of fixed rods. The two sets of springs are in a compressed state. Then, by rotating the cover plate through the finger groove, the cover plate engages with the threads on the testing pen to seal, thus scraping away residues on the surface of fruits and vegetables and sealing the testing pen. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a fruit and vegetable pesticide residue detection pen that integrates sampling and extraction functions according to this utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall structure of a fruit and vegetable pesticide residue detection pen that integrates sampling and extraction functions according to this utility model. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the connection structure between the detection pen, the rotating shaft, and the stirring blade in this utility model;

[0024] Figure 4 This is a schematic diagram of the connection structure between the sampling head, the slider, and the fixing rod in this utility model;

[0025] Figure 5 This is a schematic diagram of the connection structure between the arc-shaped T-shaped slider, the fixing ring, and the anti-loss rope in this utility model;

[0026] Figure 6 This is a schematic diagram of the connection structure between the inspection door, handle, and card seat in this utility model.

[0027] In the diagram: 1. Testing pen; 2. Sampling head; 3. Buffer tank; 4. Micro pump; 5. Enzyme tank; 6. Chromogenic reagent tank; 7. Drainage assembly; 8. Motor; 9. Shaft; 10. Stirring blade; 11. Slider; 12. Fixing rod; 13. Spring; 14. Elastic buckle; 15. Cover plate; 16. Finger groove; 17. Thread; 18. Annular groove; 19. Arc-shaped T-slider; 20. Fixing ring; 21. Anti-loss rope; 22. Base; 23. Conical bottom; 24. Inspection door; 25. Handle; 26. Card holder; 27. Hook and latch lock body. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] Please see Figure 1-6 A pesticide residue detection pen for fruits and vegetables with integrated sampling and extraction functions includes a detection pen 1, an extraction chamber at the top of the detection pen 1, an equipment chamber in the middle of the detection pen 1, a detection chamber in the lower part of the detection pen 1, a sampling head 2 in the extraction chamber, a buffer tank 3 on the upper side of the outer end of the detection pen 1, the buffer tank 3 communicating with the extraction chamber, a micro pump 4 in the equipment chamber, the input end of the micro pump 4 communicating with the extraction chamber, the output end of the micro pump 4 communicating with the detection chamber, an enzyme solution tank 5 and a colorimetric reagent tank 6 on the lower side of the outer end of the detection pen 1, both of which are communicating with the detection chamber, and a drainage assembly 7 on the lower rear end of the detection pen 1, which is communicating with the detection chamber.

[0032] In this embodiment, the sampling head 2 scrapes off the residue on the surface of fruits and vegetables. Then, the buffer solution in the buffer tank 3 is introduced into the extraction chamber of the test pen 1 to mix the buffer solution with the residue for extraction. After extraction is completed, the micro pump 4 is turned on, and the extract in the extraction chamber is introduced into the detection chamber of the test pen 1 through the micro pump 4. Then, the enzyme solution and chromogenic agent in the enzyme solution tank 5 and the chromogenic agent tank 6 are introduced into the detection chamber to mix with the extract for detection. The sampling, extraction and detection functions can be integrated into one, improving its overall performance and making it easy to carry.

[0033] Please see Figures 1-3 As one embodiment of the detection pen 1, the detection pen 1 in this utility model is provided with a motor 8 at the right end, a rotating shaft 9 is rotatably provided in the extraction chamber, the output end of the motor 8 is connected to the rotating shaft 9, a plurality of stirring blades 10 are provided on the rotating shaft 9, and the bottom end of the extraction chamber is provided with a conical bottom 23.

[0034] Specifically, when it is necessary to extract the residue, the motor 8 is turned on, which drives the rotating shaft 9 to rotate. The rotating shaft 9 drives multiple sets of stirring blades 10 to rotate. The multiple sets of stirring blades 10 accelerate the mixing and extraction efficiency of the residue and the buffer solution, which can speed up the extraction efficiency of the residue. By setting the conical bottom 23, the extract liquid in the extraction chamber can be completely discharged into the detection chamber.

[0035] Please see Figures 1-5 As one embodiment of the sampling head 2, the sampling head 2 in this invention is provided with sliders 11 on both the lower rear side and the lower front side of its outer end. The inner wall of the extraction chamber of the detection pen 1 is provided with two sets of sliding grooves. The two sets of sliders 11 slide within the two sets of sliding grooves. Each set of sliding grooves is provided with a fixing rod 12. The two sets of sliders 11 are slidably connected to the two sets of fixing rods 12. Each set of fixing rods 12 is fitted with a spring 13. The top ends of the two sets of springs 13 are connected to the bottom ends of the two sets of sliders 11, and the bottom ends of the two sets of springs 13 are connected to the bottom ends of the two sets of sliding grooves. Each set of sliders 11 has an elastic buckle 14 at its outer end. The top of each slide groove is provided with a slot, and the two sets of elastic buckles 14 are engaged with the two sets of slots. The top of the detection pen 1 is covered with a cover plate 15, and the top of the cover plate 15 is provided with two sets of finger grooves 16. The upper side of the outer end of the detection pen 1 is provided with a thread 17, and the inner end of the cover plate 15 is provided with a threaded groove. The thread 17 is engaged with the threaded groove. The outer end of the cover plate 15 is provided with an annular slide groove 18, and an arc-shaped T-shaped slider 19 is slidably engaged on the annular slide groove 18. The outer end of the arc-shaped T-shaped slider 19 and the upper side of the outer end of the detection pen 1 are both provided with a fixing ring 20, and an anti-loss rope 21 is provided between the two sets of fixing rings 20.

[0036] Specifically, when it is necessary to scrape off residues from the surface of fruits and vegetables, the cover plate 15 is rotated by the two sets of finger grooves 16. The cover plate 15 then engages with the threads 17 to open on the detection pen 1. Then, the sampling head 2, under the rebound of the two sets of springs 13, drives the two sets of sliders 11 to move upward, so that the two sets of elastic buckles 14 engage with the two sets of slots inside the detection pen 1, thereby fixing the sampling head 2. After that, the sampling head 2 scrapes off the residues on the surface of the fruits and vegetables. Then, the cover plate 15 is placed on the top of the detection pen 1, the two sets of elastic buckles 14 separate from the two sets of slots, and the cover plate 15 pushes... The sampling head 2 moves downward, and the two sets of sliders 11 move downward on the two sets of fixed rods 12. The two sets of springs 13 are in a compressed state. Then, the cover plate 15 is rotated through the finger groove 16. The cover plate 15 is sealed with the thread 17 on the detection pen 1, which serves to scrape the residue on the surface of fruits and vegetables and seal the detection pen 1. When the cover plate 15 is rotated, the arc-shaped T-shaped slider 19 slides on the annular groove 18. When the cover plate 15 is opened, the cover plate 15 is limited by the anti-loss rope 21, which can limit the cover plate 15 and prevent it from being lost.

[0037] Please refer to Figures 1-3 As a further embodiment of the detection pen 1: a base 22 is snapped onto the bottom end of the detection pen 1;

[0038] Specifically, by setting up the base 22, after sampling the residue on the surface of fruits and vegetables, the detection pen 1 can be placed on the base 22, which can support the detection pen 1 when it is working and improve the overall stability of the detection pen 1.

[0039] This utility model has an inspection port connected to the rear end of the equipment cavity. An inspection door 24 is rotatably installed at the inspection port. A handle 25 is provided at the outer end of the inspection door 24. Four sets of locking seats 26 are provided at the outer end of the inspection door 24. Four sets of latching lock bodies 27 are provided at the rear end of the test pen 1. The four sets of latching lock bodies 27 are engaged with the four sets of locking seats 26. When it is necessary to repair the micro pump 4, the four sets of latching lock bodies 27 are moved to separate the four sets of latching lock bodies 27 from the four sets of locking seats 26. Then, the inspection door 24 is opened through the handle 25, so that the micro pump 4 can be repaired, which is convenient for repairing the micro pump 4.

[0040] In summary, when using the overall equipment:

[0041] When it is necessary to scrape off residues on the surface of fruits and vegetables, the cover plate 15 is rotated by the two sets of finger grooves 16. The cover plate 15 then engages with the thread 17 on the detection pen 1 to open. Then, the sampling head 2, under the rebound of the two sets of springs 13, drives the two sets of sliders 11 to move upward, so that the two sets of elastic buckles 14 engage with the two sets of slots inside the detection pen 1 to fix the sampling head 2. Then, the sampling head 2 scrapes off the residues on the surface of the fruits and vegetables. Then, the cover plate 15 is placed on the top of the detection pen 1, and the two sets of elastic buckles 14 separate from the two sets of slots. The cover plate 15 pushes the sampling head 2 downward, and the two sets of sliders 11 move downward on the two sets of fixing rods 12. The two sets of springs 13 are in a compressed state. Then, the cover plate 15 is rotated by the finger grooves 16, and the cover plate 15 engages with the thread 17 on the detection pen 1 to seal.

[0042] The buffer solution in the buffer tank 3 is introduced into the extraction chamber of the test pen 1 to mix the buffer solution with the residue for extraction. After extraction is completed, the micro pump 4 is turned on, and the extract in the extraction chamber is introduced into the detection chamber of the test pen 1 through the micro pump 4. Then, the enzyme solution and chromogenic reagent in the enzyme solution tank 5 and the chromogenic reagent tank 6 are introduced into the detection chamber to mix with the extract for detection.

[0043] When it is necessary to extract the residue, the motor 8 is turned on, which drives the rotating shaft 9 to rotate. The rotating shaft 9 drives multiple sets of stirring blades 10 to rotate, which accelerates the mixing and extraction efficiency of the residue and the buffer solution.

[0044] When the cover plate 15 rotates, the arc-shaped T-shaped slider 19 slides on the annular groove 18. When the cover plate 15 is opened, the cover plate 15 is limited by the anti-loss rope 21.

[0045] After sampling the residue on the surface of fruits and vegetables, place the testing pen 1 on the base 22 to support the testing pen 1 during operation.

[0046] When the micro pump 4 needs to be repaired, the four sets of latch locks 27 are pulled to separate the four sets of latch locks 27 from the four sets of card seats 26. Then, the access door 24 is opened by the handle 25, so that the micro pump 4 can be repaired.

[0047] In all the solutions mentioned above, the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

[0048] In all the solutions mentioned above, the operation of electrical components is controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies. Therefore, their electrical connection relationships and specific circuit structures will not be elaborated here.

Claims

1. A pesticide residue detection pen for fruits and vegetables with integrated sampling and extraction functions, comprising a detection pen (1), characterized in that: An extraction chamber is provided at the top of the test pen (1), an equipment chamber is provided in the middle of the test pen (1), a test chamber is provided in the lower part of the test pen (1), a sampling head (2) is provided in the extraction chamber, a buffer tank (3) is provided on the upper side of the outer end of the test pen (1), the buffer tank (3) is connected to the extraction chamber, a micro pump (4) is provided in the equipment chamber, the input end of the micro pump (4) is connected to the extraction chamber, the output end of the micro pump (4) is connected to the test chamber, an enzyme solution tank (5) and a colorimetric reagent tank (6) are provided on the lower side of the outer end of the test pen (1), both the enzyme solution tank (5) and the colorimetric reagent tank (6) are connected to the test chamber, and a drain assembly (7) is provided on the lower side of the rear end of the test pen (1), the drain assembly (7) is connected to the test chamber.

2. The fruit and vegetable pesticide residue detection pen with integrated sampling and extraction function according to claim 1, characterized in that: The detection pen (1) is equipped with a motor (8) on its right end, and a rotating shaft (9) is provided inside the extraction chamber. The output end of the motor (8) is connected to the rotating shaft (9), and multiple sets of stirring blades (10) are provided on the rotating shaft (9).

3. The fruit and vegetable pesticide residue detection pen with integrated sampling and extraction function according to claim 1, characterized in that: The sampling head (2) has sliders (11) on its lower rear side and lower front side. The extraction chamber of the detection pen (1) has two sets of grooves on its inner wall. The two sets of sliders (11) slide in the two sets of grooves. Each set of grooves has a fixed rod (12). The two sets of sliders (11) are slidably connected to the two sets of fixed rods (12). Each set of fixed rods (12) is fitted with a spring (13). The top of each set of springs (13) is connected to the bottom of each set of sliders (11). The bottom of each set of springs (13) is connected to the bottom of each set of sliders (11). The end is connected to the bottom end of the two sets of sliding grooves. The outer ends of the two sets of sliders (11) are provided with elastic buckles (14). The top of the two sets of sliding grooves is provided with slots. The two sets of elastic buckles (14) are engaged with the two sets of slots. The top of the detection pen (1) is covered with a cover plate (15). The top of the cover plate (15) is provided with two sets of finger grooves (16). The upper side of the outer end of the detection pen (1) is provided with threads (17). The inner end of the cover plate (15) is provided with a threaded groove. The threads (17) are engaged with the threaded groove.

4. The fruit and vegetable pesticide residue detection pen with integrated sampling and extraction function according to claim 3, characterized in that: The outer end of the cover plate (15) is provided with an annular groove (18), and an arc-shaped T-shaped slider (19) is slidably mounted on the annular groove (18). The outer end of the arc-shaped T-shaped slider (19) and the upper side of the outer end of the detection pen (1) are both provided with a fixing ring (20), and an anti-loss rope (21) is provided between the two sets of fixing rings (20).

5. The fruit and vegetable pesticide residue detection pen with integrated sampling and extraction function according to claim 1, characterized in that: The bottom of the detection pen (1) is fitted with a base (22).

6. The fruit and vegetable pesticide residue detection pen with integrated sampling and extraction function according to claim 3, characterized in that: The bottom of the extraction chamber is set as a conical bottom (23).

7. The fruit and vegetable pesticide residue detection pen with integrated sampling and extraction function according to claim 1, characterized in that: The rear end of the equipment cavity is connected to an inspection port, and an inspection door (24) is rotatably provided at the inspection port. A handle (25) is provided at the outer end of the inspection door (24), and four sets of card seats (26) are provided at the outer end of the inspection door (24). Four sets of latch lock bodies (27) are provided at the rear end of the test pen (1). The four sets of latch lock bodies (27) are engaged with the four sets of card seats (26).

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