A trace detection device capable of continuous and automatic sampling of documents

Abstract

The present invention relates to a trace detection device, and discloses a trace detection device capable of continuously and automatically sampling documents. The device comprises a frame (1), a card reader (2), a sampling test paper (3), a detection tube (4), and a detection device (5) mounted on the frame (1), wherein the sampling test paper (3) contacts the document sample portion inserted into the card reader (2) and moves to the air suction sampling position of the detection device (5) for detection; the device also comprises a tube changing assembly, which comprises an X-axis track (8) and a tube changing seat (6), and further comprises a material discharge bin (9) and a waste bin (10) located on the same plane as the detection device (5). The device significantly reduces the mechanical action of the tube changing and significantly increases reliability; the PLC control unit is deleted and its functions are integrated into the main control board, thereby reducing space and signal interaction; the device uses a brushless motor air pump and is externally independent of the detection module, which has a long service life and is easy to maintain; the pressure head mechanism has higher sampling efficiency; and the material bin discharge mechanism is more stable.

Description

Technical Field

[0001] The invention relates to a trace detection device, in particular to a trace detection device capable of continuously and automatically sampling documents. Background Art

[0002] Trace detection involves two steps: sampling and testing. The efficiency and effectiveness of sampling are directly related to the efficiency and accuracy of testing. For example, traditional explosives testing relies primarily on manual swabbing. Security personnel use a sampling consumable or a tool to hold the sampling consumable on the surface of a person or object to swab the sample, which is then inserted into an explosives detector for explosives testing. This method is time-consuming and labor-intensive, costly, and has a noticeable target. The sample experience is poor, making it susceptible to public rejection. Previous versions employed a detection method designed to ensure that most travel documents, such as ID cards and passports, could be sampled and tested. This required a large sampling surface to accommodate large documents like passports. The problem with this large sampling surface is that if a small document like an ID card is used, the ID card's sampling surface cannot be properly aligned with the test paper's sampling surface, reducing detection sensitivity.

[0003] The solution to the problem of automatically replacing inspection consumables that needed to be solved in the previous version was to design a new set of complex XY plane actions controlled by PLC independently of the inspection unit to replace the inspection consumables. The module and the inspection unit used wired connections for signal exchange, which caused problems such as complex structure and high failure rate.

[0004] In previous versions, the lifting and lowering of the sampling component could not be accurately positioned. The sampling surface of the test paper was in contact with the document insertion plane when waiting for the document to be inserted. After the detection alarm, the contact with the plane may cause a continuous alarm. Summary of the Invention

[0005] The present invention aims at the shortcomings of the prior art and provides a trace detection device capable of continuously and automatically sampling documents.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A trace detection device capable of continuously and automatically sampling documents comprises a frame on which a card reader, a sampling test paper, a detection tube and a detection device are mounted. The sampling test paper contacts the sample portion of the document inserted in the card reader and moves to the air suction sampling position of the detection device for detection; the device also comprises a tube changing assembly, the tube changing assembly comprises an X-axis track and a tube changing seat, the tube changing seat is mounted on the X-axis track and moves along the X-axis track, and further comprises a lower material bin and a waste material bin mounted on the upper and lower sides of the X-axis track and located on the same plane as the detection device. By setting the same horizontal plane, the mechanical structure of the Y-axis part can be eliminated, a detection groove is provided on the upper surface of the detection device, and the material taking position, detection position and material return position of the detection tube are all set on a straight line of the X-axis, which optimizes the complex XY motion into a simple linear motion, thereby increasing the reliability of a series of actions such as replacing the detection glass tube. In addition, the main body of the detection device is deconstructed, the main body shell is eliminated, and the internal optical detection module and airflow control module are placed independently, which reduces the maintenance workload after the independent module fails and facilitates the replacement of wearing parts.

[0008] Preferably, the tube changing seat includes an integrally formed base and a tube changing body, the tube changing body is provided with a long hole parallel to the X-axis track, the front of the long hole is provided with a rubber ring that seals with the detection tube, and a push rod is installed in the long hole to push the detection tube out of the tube changing seat, and the thrust generated by the push rod pushing the detection tube forward is greater than the grip of the rubber ring on the detection tube, thereby pushing the detection tube out of the tube changing seat; an infrared detector is provided on the X-axis track, that is, the infrared detector is defined as being located at the zero point of the X-axis track. If the infrared detector is blocked when the tube changing seat returns to zero after power-on, it means that the detection tube on the current tube changing seat has not been pulled out of the tube seat and does not need to be replaced. A mounting groove is provided on the inner wall of the front of the long hole, and the rubber ring is gap-matched with the groove wall of the mounting groove. When the detection tube is inserted into the front of the long hole, the detection tube stretches the rubber ring and pushes the rubber ring to press tightly on the mounting groove for an interference fit.

[0009] Preferably, a retaining ring is provided in the long hole, a spring is provided on the push rod, one end of the spring is installed on the push rod, and the other end of the spring is in contact with the retaining ring; a sealing ring is provided at the rear end of the long hole, and the sealing ring is sealed with the push rod.

[0010] Preferably, it also includes an airflow control module, which is installed inside the frame. The airflow control module includes a brushless air pump, which is provided with an air inlet and an air outlet. The tube changing body is provided with an air port connected to the long hole, and the air inlet is connected to the air port through a hose. The tube changing assembly also includes a servo motor, which is connected to the tube changing seat and drives the tube changing seat to move back and forth on the X-axis track.

[0011] Preferably, a pressure head is also installed on the frame, and the sampling test paper is located between the pressure head and the card reader. A silicone roller is installed on the pressure head, and the sampling test paper is pressed onto the document sample in the card reader through the silicone roller for sampling.

[0012] Preferably, the pressure head component also includes a guide rail slide and a pressure head shaft seat cooperating with the guide rail slide, the silicone roller is fixedly mounted on the pressure head shaft seat, a cam is fixedly mounted on the guide rail slide, and the pressure head shaft seat is provided with a cam groove cooperating with the cam. It also includes a spring plunger, one end of the spring plunger is fixed on the guide rail slide, and the other end of the spring plunger is fixed on the pressure head shaft seat and pushes the pressure head shaft seat upward. The cam is fixed and driven by an N20 reduction motor. The rotation of the cam drives the pressure head shaft seat to rise and fall, and lifts the sampling test paper to a distance of about 1 mm from the sampling surface (document insertion platform), which is also less than the thickness of the document, ensuring sampling efficiency and avoiding false alarms caused by contamination of the sampling surface.

[0013] Preferably, a waste bin guide groove is further included, one end of the waste bin guide groove is arranged toward the X-axis track, and the other end of the waste bin guide groove is arranged toward the waste bin.

[0014] Preferably, the discharge port of the lower hopper is located directly above the detection device, and the position of the discharge port is optimized to be directly above the detection device. A detection groove is provided on the upper surface of the detection device, and the detection groove is located below the discharge port of the lower hopper, and the detection groove cooperates with the detection tube. After the detection tube is removed, it will naturally fall into the test position of the tube holder of the detection device, reducing the movement of the tube change seat in the Y direction after grabbing the detection tube, and correspondingly reducing the risk of collision caused by the position offset of the detection tube when reinserting the tube holder; a material picking shaft is provided in the lower hopper, and the material picking shaft is an eccentric shaft. When the detection tubes above the material picking shaft form a stacked dead space and the tube cannot be taken, the eccentric shaft can be used to stir and destroy the stack, thereby smoothly taking the detection tube.

[0015] Preferably, a test paper transmission assembly is also installed on the frame, and the test paper transmission assembly includes a new paper reel and a waste paper reel, and the new paper reel and the waste paper reel are both connected to a stepper motor, one end of the sampling test paper is fixed on the new paper reel, and the other end of the sampling test paper is fixed on the waste paper reel, and also includes a tension switch, which is fixed on the frame and in contact with the sampling test paper.

[0016] Preferably, it also includes a heating base and a clamping heating head. The sampling test paper is located between the heating base and the clamping heating head for heating. The sampling test paper at the detection position can be automatically clamped and heated to promote the vaporization of the substance being tested thereon and improve the detection effect.

[0017] Preferably, the sampling test strip is provided with positioning holes, which are evenly distributed. By using the positioning holes designed at regular intervals, the infrared sensor can be read to detect the number of positioning holes passed through to calculate the movement distance of the sampling test strip, thereby controlling the movement of the sampling area of the sampling test strip from the sampling point to the detection point.

[0018] Preferably, it also includes a controller fixedly mounted on the frame, the controller is connected to the ID card reading module on the card reader, the controller is connected to the tube changing assembly and controls the tube changing seat to replace the detection tube, the controller is connected to the detection device and detects the sampling test paper, and the controller is connected to the stepper motor of the test paper transmission assembly and controls the rotation of the new paper reel and the waste paper reel.

[0019] Due to the adoption of the above technical solutions, the present invention has significant technical effects: the mechanical action of tube replacement is greatly reduced and the reliability is greatly increased; the PLC control unit is deleted and its functions are integrated into the main control board, which reduces space and signal interaction and increases reliability; the air pump is provided by a brushless motor and is independent of the detection module, so it has a long service life and is easy to maintain; the sampling efficiency of the pressure head mechanism is higher; and the silo unloading mechanism is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a rear view of the present invention.

[0022] Figure 3 yes Figure 1 Schematic diagram of the tube seat replacement mechanism.

[0023] Figure 4 yes Figure 1 Front view of the pressure head.

[0024] Figure 5 yes Figure 1 Side view of the pressure head.

[0025] Figure 6 yes Figure 1 Schematic diagram of the structure of the unloading silo.

[0026] Figure 7 yes Figure 1 Schematic diagram of the structure of the detection device.

[0027] The parts designated by the numbers in the accompanying drawings are as follows: 1-frame, 2-card reader, 3-sampling test paper, 4-test tube, 5-test device, 6-tube changer, 7-pressing head, 8-X-axis track, 9-feeding bin, 10-waste bin, 11-test paper transmission assembly, 12-brushless air pump, 13-controller, 14-clamping heating head, 21-ID card reader module, 51-test slot, 61-base, 62-tube changer, 621-long hole, 6211-mounting slot, 6212-retaining ring, 622-rubber ring, 6 23—push rod, 6231—spring, 63—servo motor, 64—air port, 65—sealing ring, 71—silicone roller, 72—guide rail slide, 721—cam, 722—lower U-shaped groove infrared pair tube, 723—upper U-shaped groove infrared pair tube, 73—pressing head shaft seat, 731—cam groove, 732—infrared blocking positioning block, 74—spring plunger, 91—removal shaft, 101—waste bin guide groove, 111—new paper reel, 112—waste paper reel, 113—tension switch, 121—air inlet, 122—air outlet. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] A trace detection device capable of continuously and automatically sampling documents comprises a frame 1, on which are mounted a card reader 2, a sampling test paper 3, a detection tube 4, and a detection device 5. The sampling test paper 3 contacts the document sample portion inserted into the card reader 2 and moves to the inhalation sampling position of the detection device 5 for detection. The device also comprises a tube replacement assembly. The detection tube 4 is always inside the detection device 5 during normal use. When the life of the detection tube 4 is consumed and the detection sensitivity decreases, the detection tube 4 is removed from the detection device 5 for replacement through the tube removal assembly. The tube replacement assembly comprises an X-axis track 8 and a tube replacement seat 6. The tube replacement seat 6 is mounted on the X-axis track 8 and moves along the X-axis track. The track 8 moves, and also includes a discharge bin 9 and a waste bin 10 installed on the upper and lower sides of the X-axis track 8 and located on the same plane as the detection device 5. The setting of the same horizontal plane can eliminate the mechanical structure of the Y-axis part, and the material taking position, detection position and material return position of the detection tube 4 are all set on the straight line of the X-axis, which optimizes the complex XY motion into a simple linear motion, and increases the reliability of a series of actions such as replacing the detection glass tube. In addition, the main body of the detection device is deconstructed, the main body shell is eliminated, and the internal optical detection module and airflow control module are placed independently, which reduces the maintenance workload after the independent module fails and facilitates the replacement of wearing parts.

[0031] The tube changing seat 6 includes an integrally formed base 61 and a tube changing body 62. The tube changing body 62 is provided with a long hole 621 parallel to the X-axis track 8. A rubber ring 622 is provided at the front of the long hole 621 to seal with the detection tube 4. A push rod 623 is installed in the long hole 621 to push the detection tube 4 out of the tube changing seat 62. The thrust generated by the push rod 623 pushing the detection tube 4 forward is greater than the grip of the rubber ring 622 on the detection tube 4, thereby pushing the detection tube 4 out of the tube changing body 62. An infrared detector 81 is provided on the X-axis track 8. , that is, the infrared detector 81 is defined as being located at the zero point of the X-axis track 8. If the infrared detector 81 is blocked when the tube holder 62 returns to zero after power is turned on, it means that the detection tube 4 on the current tube holder 62 has not been pulled out of the tube holder and does not need to be replaced. A mounting groove 6211 is provided on the inner wall of the front of the long hole 621. The rubber ring 622 is in clearance with the groove wall of the mounting groove 6211. When the detection tube 4 is inserted into the front of the long hole 621, the detection tube 4 stretches the rubber ring 622 and pushes the rubber ring 622 to press against the mounting groove 6211 to form an interference fit. There are three rubber rings 622 at the sealing groove 6211. The rubber rings 622 are fluororubber sealing rings. The three rubber rings 622 inserted into the front of the long hole 621 are loosely fitted with the mounting groove 6211. Before the detection tube 4 is inserted, the outer diameter of the rubber ring 622 is smaller than the inner diameter of the mounting groove 6211. When the tube removal head is inserted into the detection tube 4, the inner diameter of the rubber ring 622 is smaller than the outer diameter of the detection tube 4. The rubber ring 622 expands completely, filling the gap between the rubber ring 622 and the mounting groove 6211, thus ensuring an airtight connection between the detection tube 4 and the tube replacement body 62. Since the inner diameter of the detection tube 4 is larger than the inner diameter of the rubber ring 622, the gripping force generated is relatively stable. Therefore, if the gripping force of the rubber ring 622 needs to be increased, simply add an appropriate rubber ring 622. This design provides a more stable gripping force and extends the life of the rubber ring 622.

[0032] A retaining ring 6212 is provided in the long hole 621, and a spring 6231 is sleeved on the push rod 623. One end of the spring 6231 is installed on the push rod 623, and the other end of the spring 6231 is in contact with the retaining ring 6212. A sealing ring 65 is provided at the rear end of the long hole 621, and the sealing ring 65 is sealed with the push rod 623. Through the arrangement of the rubber ring 622 and the sealing ring 65, a closed cavity is formed in the long hole 621.

[0033] It also includes an airflow control module, which is installed inside the frame 1. The airflow control module includes a brushless air pump 12. The brushless air pump 12 is provided with an air inlet 121 and an air outlet 122. The tube changing body 62 is provided with an air port 64 connected to the long hole 621. The air inlet 121 is connected to the air port 64 through a hose. The brushless air pump 12 is installed above the X-axis track 8 and is located in the same plane as the push rod 623. The push rod 623 is contacted and limited by the outer shell of the brushless cylinder 12; the tube changing assembly 6 also includes a servo motor 63, which is connected to the tube changing seat 6 and pushes the tube changing seat 6 to move back and forth on the X-axis track 8.

[0034] The tube changing assembly is a device that can automatically change the detection tube 4. When the detection module detects that the detection tube 4 does not meet the detection standards, it can control the mechanical components to automatically change the detection tube 4, so that the detection sensitivity of the whole machine is maintained at a high level. The tube changing seat 6 is installed on the X-axis track 8 as a whole. The rotation of the servo motor 63 drives the entire tube changing seat 6 to move back and forth in the X-axis direction. The push rod 623 can push the detection tube 4 out of the tube changing seat 6 because when the base 61 and the tube changing body 62 move to the left, the push rod 623 will contact the left (rear) brushless air pump 12 shell. At this time, the brushless air pump 12 has a limiting effect on the push rod 623, but the base 61 and the tube changing body 62 still move backward along the X-axis track 8 as a whole, and finally the shell of the brushless air pump 12 drives the push rod 623 to push forward and push out the detection tube 4. 。

[0035] It also includes an air flow control module, which is an independent module installed inside the rack 1. The air flow control module includes a brushless air pump 12. The air flow control module reads the air pump flow through the I2C protocol and controls the air pump suction volume through PWM. There is also an air filter element inside the module to facilitate regular maintenance and inspection.

[0036] Example 2

[0037] The embodiment is the same as Example 1, except that a pressure head 7 is also mounted on the frame 1. The sampling test paper 3 is located between the pressure head 7 and the card reader 2. A silicone roller 71 is mounted on the pressure head 7, and the silicone roller 71 is used to press the sampling test paper 3 against the ID sample in the card reader 2 for sampling. The pressure head 7 can control the lifting and lowering of the sampling test paper 3. The sampling test paper 3 is normally raised, and is immediately lowered when the ID sample needs to be sampled. This prevents the paper strip outside the sampling area of the sampling test paper 3 from contacting the ID sample surface during rotation, thereby contaminating and reducing the life of the sampling test paper 3. The silicone roller 71 optimizes the sliding friction between the sampling test paper 3 and the contact surface to rolling friction, reducing the friction force on the sampling test paper and increasing its service life. In addition, the flexible material on the surface of the silicone roller 71 supports the sampling test paper 3, providing a better feel when the ID sample is inserted and higher sampling efficiency.

[0038] The pressing head component 7 also includes a guide rail slide 72 and a pressing head shaft seat 73 that cooperates with the guide rail slide 72. The silicone roller 71 is fixed on the pressing head shaft seat 73. A cam 721 is fixed on the guide rail slide 72. The pressing head shaft seat 73 is provided with a cam groove 731 that cooperates with the cam 721. It also includes a spring plunger 74. One end of the spring plunger 74 is fixed on the guide rail slide 72, and the other end of the spring plunger 74 is fixed on the pressing head shaft seat 73 and pushes the pressing head shaft seat 73 upward. The cam 72 is fixed and driven by the N20 reduction motor. Through the rotation of the cam 72, the pressing head shaft seat 73 is driven to rise and fall, and the sampling test paper 3 is lifted to a distance of about 1 mm from the sampling surface document insertion platform, which is also less than the thickness of the document, ensuring sampling efficiency and avoiding false alarms caused by contamination of the sampling surface.

[0039] When the locking cam 731 is unlocked, the locking cam 731 is unlocked and the locking cam 732 is unlocked, so that the locking cam 732 can be unlocked and the locking cam 732 can be unlocked.

[0040] Example 3

[0041] The embodiment is the same as that of Example 1, except that it further includes a waste bin guide groove 101 , one end of the waste bin guide groove 101 is arranged toward the X-axis track 61 , and the other end of the waste bin guide groove 101 is arranged toward the waste bin 10 .

[0042] The discharge port of the discharge bin 9 is located directly above the detection device 5, and the position of the discharge port is optimized to be directly above the detection device 5. After the detection tube 4 is removed, it will naturally fall into the test position of the tube holder of the detection device, reducing the movement of the tube changing seat 6 in the Y direction after grabbing the detection tube 4, and correspondingly reducing the collision risk caused by the position offset of the detection tube 4 when reinserting the tube holder; a material picking shaft 91 is provided in the discharge bin 9, and the material picking shaft 91 is an eccentric shaft. When a dead space of stacked detection tubes 4 is formed above the material picking shaft 91 and the tube cannot be taken, the stack can be destroyed by stirring through the eccentric shaft, thereby smoothly taking the detection tube 4.

[0043] The upper surface of the detection device 5 is provided with a detection groove 51, which is located below the discharge port of the lower hopper 9 and cooperates with the detection tube 4. The detection groove 51 is used to position the detection tube 4, making it easier to assemble the tube holder 6 and the detection tube 4.

[0044] Example 4

[0045] The same as Example 1, except that a test paper transmission component 11 is further installed on the frame 1, and the test paper transmission component 11 includes a new paper reel 111 and a waste paper reel 112. The new paper reel 111 and the waste paper reel 112 are both connected to a stepper motor, one end of the sampling test paper 3 is fixed on the new paper reel 111, and the other end of the sampling test paper 3 is fixed on the waste paper reel 112. It also includes a tension switch 113, which is fixed on the frame 1 and in contact with the sampling test paper 3. When the new paper reel 111 and the waste paper reel 112 are rotating, the sampling test paper 3 is rotated by the master and slave wheels. The influence of the torque causes the tightness of the sampling test paper 3 to be uncontrollable. If it is too tight, the sampling device will not be able to be lifted to the specified position after being lifted, the sampling efficiency will be reduced, or even normal sampling cannot be performed. If the sampling test paper 3 is too loose, the sampling position will be offset, and the actual sampling area cannot be transferred to the detection position, resulting in a significant reduction in sensitivity. Therefore, a tightness switch 113 is set on the movement path of the sampling test paper 3. When the sampling test paper 3 is tightened, the motor stops rotating at the moment the tightness switch 113 is pressed by the tightening force of the test paper. When the tightness switch 113 is not pressed, it indicates that the test paper is still in a loose state.

[0046] Example 5

[0047] It is the same as Example 1, except that it also includes a heating base and a clamping heating head 14. The sampling test paper 3 is located between the heating base and the clamping heating head 14 for heating. The sampling test paper 3 at the detection position can be automatically clamped and heated to promote the vaporization of the substance being tested thereon and improve the detection effect.

[0048] Example 6

[0049] This is the same as Example 1, except that the sampling test strip 3 is provided with positioning holes, which are evenly distributed. By using the positioning holes designed at regular intervals, the infrared sensor can be read to detect the number of positioning holes passed through, thereby calculating the movement distance of the sampling test strip 3 and controlling the movement of the sampling area of the sampling test strip 3 from the sampling point to the detection point.

[0050] Example 7

[0051] The embodiment is the same as Example 1, except that it further includes a controller 13 fixed to the frame 1. The controller 13 is connected to the ID card reading module 21 on the card reader 2. The controller 13 is connected to the tube changing assembly and controls the tube changing seat 62 to replace the detection tube 4. The controller 13 is connected to the detection device 5 and detects the sampling test paper 3. The controller 13 is connected to the stepper motor of the test paper transport assembly 11 and controls the rotation of the new paper reel 111 and the waste paper reel 112. The controller 13 is connected to the unloading bin 9 and controls its unloading.

[0052] In short, the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A trace detection device capable of continuous and automatic sampling of documents, comprising a frame (1), characterized in that: The frame (1) is provided with a card reader (2), a sampling test paper (3), a detection tube (4) and a detection device (5). The sampling test paper (3) contacts the document sample portion inserted into the card reader (2) and moves to the air sampling position of the detection device (5) for detection. The detection tube (4) moves into the detection device (5) for detection. The frame (1) also includes a tube changing assembly, which includes an X-axis track (8) and a tube changing seat (6). The tube changing seat (6) is installed on the X-axis track (8) and moves along the X-axis track (8). The frame (1) also includes a lower material bin (9) and a waste material bin (10) installed on the upper and lower sides of the X-axis track (8) and located on the same plane as the detection device (5). The tube changing seat (6) includes a base (61) and a tube changing body (62). The body (62) is provided with a long hole (621) parallel to the X-axis track (8), the front of the long hole (621) is provided with a rubber ring (622) that is sealed with the detection tube (4), and a push rod (623) is installed in the long hole (621); the inner wall of the front of the long hole (621) is provided with a mounting groove (6211), and the rubber ring (622) is clearance-matched with the groove wall of the mounting groove (6211). When the detection tube (4) is inserted into the front of the long hole (621), the detection tube (4) opens the rubber ring (622) and pushes the rubber ring (622) to press on the mounting groove (6211) with an interference fit; a retaining ring (6212) is provided in the long hole (621), and a spring (6231) is sleeved on the push rod (623). The spring (623 1) is mounted on the push rod (623), and the other end of the spring (6231) contacts the retaining ring (6212); a sealing ring (65) is provided at the rear end of the long hole (621), and the sealing ring (65) is sealed and matched with the push rod (623); and an air flow control module is also included, which is mounted inside the frame (1), and the air flow control module includes a brushless air pump (12), and the brushless air pump (12) is provided with an air inlet (121) and an air outlet (122); an air port (64) connected to the long hole (621) is opened on the tube body (62), and the air inlet (121) is connected to the air port (64) through a hose; the brushless air pump (12) is mounted above the X-axis track (8) and is located in the same plane as the push rod (623). The tube changing assembly (6) further comprises a servo motor (63), which is connected to the tube changing seat (6) and drives the tube changing seat (6) to move forward and backward on the X-axis track (8); and further comprises a waste bin guide groove (101), one end of which is arranged toward the X-axis track (61), and the other end of which is arranged toward the waste bin (10); the discharge port of the lower material bin (9) is located directly above the detection device (5); a material taking rotating shaft (91) is provided in the lower material bin (9), and the material taking rotating shaft (91) is an eccentric rotating shaft; a detection groove (51) is provided on the upper surface of the detection device (5), and the detection groove (51) is located below the discharge port of the lower material bin (9), and the detection groove (51) cooperates with the detection tube (4).

2. The trace detection device capable of continuous and automatic sampling of documents according to claim 1, characterized in that: A pressing head (7) is also installed on the frame (1), and the sampling test paper (3) is located between the pressing head (7) and the card reader (2). A silicone roller (71) is installed on the pressing head (7) and the sampling test paper (3) is pressed onto the document sample in the card reader (2) by the silicone roller (71) to perform sampling.

3. The trace detection device capable of continuous and automatic sampling of documents according to claim 2, characterized in that: The pressure head component (7) further comprises a guide rail slide (72) and a pressure head shaft seat (73) matched with the guide rail slide (72); the silicone roller (71) is fixedly mounted on the pressure head shaft seat (73); a cam (721) is fixedly mounted on the guide rail slide (72); a cam groove (731) matched with the cam (721) is provided on the pressure head shaft seat (73); and a spring plunger (74) is further comprised, one end of the spring plunger (74) being fixed on the guide rail slide (72); and the other end of the spring plunger (74) being fixed on the pressure head shaft seat (73) and pushing the pressure head shaft seat (73) upward.

4. The trace detection device capable of continuous and automatic sampling of documents according to claim 1, characterized in that: A test paper transmission assembly (11) is also installed on the frame (1). The test paper transmission assembly (11) includes a new paper reel (111) and a waste paper reel (112). The new paper reel (111) and the waste paper reel (112) are both connected to a stepping motor. One end of the sampling test paper (3) is fixed on the new paper reel (111), and the other end of the sampling test paper (3) is fixed on the waste paper reel (112). The test paper transmission assembly (11) also includes a tension switch (113). The tension switch (113) is fixed on the frame (1) and contacts the sampling test paper (3).

5. The trace detection device capable of continuous and automatic sampling of documents according to claim 1, characterized in that: It also includes a heating base and a clamping heating head (14), and the sampling test paper (3) is located between the heating base and the clamping heating head for heating; the sampling test paper (3) is provided with positioning holes, and the positioning holes are evenly distributed.

6. The trace detection device capable of continuous and automatic sampling of documents according to claim 4, characterized in that: The invention also includes a controller (13) fixedly mounted on the frame (1), the controller (13) being connected to the ID card reading module (21) on the card reader (2), the controller (13) being connected to the tube changing assembly and controlling the tube changing seat (6) to replace the detection tube (4), the controller (13) being connected to the detection device (5) and detecting the sampling test paper (3), and the controller (13) being connected to the stepping motor of the test paper transmission assembly (11) and controlling the rotation of the new paper reel (111) and the waste paper reel (112).

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