A detection tube automatic replacement device

Abstract

The application provides a kind of detection tube automatic replacement device, including the linear movement of being driven by first driving mechanism tube taking mechanism, the rotating block of being set in tube taking mechanism right side and being aligned with tube taking mechanism position between the conversion of material taking position, material returning position and avoiding position;Detection instrument is set in the rotating block right side, the single tube of being set in the rotating block above unloading storage tube box;The tube taking mechanism includes right end for placing detection tube tube taking head, the ejector pin of being able to move oppositely with tube taking head is arranged in tube taking head and ejects detection tube;Material taking groove is arranged in material taking position and is taken from the upper storage tube box;The detection tube is taken away by tube taking head moving to one end of material taking groove;The material returning position is provided with material returning groove, and the detection tube after detection is placed into material returning groove by tube taking mechanism and is separated by ejector pin and detection tube;When material returning position is below, the detection tube after separation falls from material returning groove, and the collecting mechanism is arranged below the rotating block.

Description

Technical Field

[0001] This invention belongs to the field of security inspection and testing, and specifically relates to an automatic replacement device for detection tubes. Background Technology

[0002] Currently, in explosion-proof testing at airports and other locations, various technical approaches are used in explosive detection instruments to identify explosives. One such approach is based on fluorescence quenching technology. Explosive detectors using this technology require detection tubes, which are consumables and need to be replaced periodically. Currently, the main method is manual replacement, which is inefficient due to the frequent replacements. Patent CN215710035U discloses an automatic glass tube replacement device. However, the patent structure is complex, requiring two-way drive mechanisms. Furthermore, the prior art relies on the difference in friction to remove the detection tube from the hopper and the detection device. The glass tube is then retained in the collection device based on the difference in friction, meaning each glass tube requires a corresponding hole in the collection device. The entire hopper, detection device, and collection device are integrated, occupying a large space and limiting the number of tubes that can be stored or collected. Moreover, the tube-removing mechanism in the prior art requires alignment at three positions and three centering operations, demanding high precision. Summary of the Invention

[0003] This invention provides an automatic replacement device for detection tubes.

[0004] The objective of this invention is achieved in the following manner: an automatic tube replacement device includes a tube-taking mechanism that moves linearly driven by a first driving mechanism; a rotating block located to the right of the tube-taking mechanism and rotated by a second driving mechanism, its position shifting between a picking position, a retraction position, and a clearance position; a detector located to the right of the rotating block; and a storage box located above the rotating block and driven by a third driving mechanism to discharge single tubes. The tube-taking mechanism includes a tube-taking head at its right end for placing the detection tube, and a ejector pin inside the tube-taking head that can move relative to the tube-taking head to eject the detection tube. The picking position has a picking groove for receiving material from the storage box above. The tube-taking head moves to one end of the picking groove and removes the detection tube. The retraction position has a retraction groove, where the tube-taking mechanism places the detected detection tube into the retraction groove and separates it from the detection tube by the ejector pin. When the retraction position is at the bottom, the separated detection tube falls from the retraction groove. A collection mechanism is located below the rotating block.

[0005] It also includes a position sensor located next to the rotating block to detect whether there is a detection tube in the material picking position where the rotating block is aligned with the tube picking mechanism; the first drive mechanism, the second drive mechanism, the third drive mechanism, the detector, and the position sensor are all electrically connected to the controller.

[0006] It also includes a mounting bracket fixed on the frame. The tube picking mechanism includes a tube changing shaft slidably mounted on the mounting bracket. The right end of the tube changing shaft is provided with the ejector pin. The tube picking head is slidably mounted on the ejector pin. A compression spring is provided on the ejector pin between the tube changing shaft and the tube picking head.

[0007] The tube-taking head is provided with stepped through holes with small diameters at both ends and a large diameter in the middle; a sealing ring for clamping the test tube is provided in the right end hole of the stepped through hole; a limiting ring is provided on the ejector pin near the right end, and the limiting ring can only move in the middle hole of the stepped through hole; when the right end of the ejector pin is inserted into the right end hole, the ejector pin pushes the test tube out of the tube-taking head.

[0008] The material receiving groove is a blind hole with a V-shaped cross-section. The left end of the material receiving groove extends to the left end face of the rotating block. The upper end of the material receiving groove is open to receive the detection tube. The length of the material receiving groove is less than the length of the detection tube. The upper end of the material discharge groove is an open end for material discharge. The material discharge groove is a through hole or the length of the material discharge groove is greater than the length of the detection tube.

[0009] The lower end of the storage box is provided with a feeding channel that connects to the internal storage space of the storage box. A cylindrical hole is provided in the feeding channel, and a tube outlet rotating shaft of corresponding size is provided in the cylindrical hole. The tube outlet rotating shaft is driven to rotate by a third driving mechanism. The circumferential surface of the tube outlet rotating shaft is provided with a single tube hole with an upper opening and only one detection tube can enter.

[0010] The second and third drive mechanisms share the same motor; the rotating block is fixedly mounted on the rotating shaft; the rotating shaft is rotatably mounted on the frame, and the rotating shaft and the outlet rotating shaft are connected and rotate synchronously through a transmission mechanism; the motor drives either the rotating shaft or the outlet rotating shaft to rotate.

[0011] It also includes a mounting bracket fixed on the frame, on which limit switches are respectively provided at the left limit position, zero position and right limit position along the moving direction of the tube picking mechanism.

[0012] Compared with the prior art, the tube-taking mechanism in this invention only needs to make linear movements to satisfy operations such as clamping the test tube, moving the test tube to the test position, moving the tested test tube to the unloading trough, and unloading the tube. The operation process is simple, the structure is simple, and the precision is high.

[0013] In this invention, the storage box and the rotating block are linked, and the same driving mechanism can meet the actions of each step, realizing the operations of feeding, picking, tube retraction and dropping. The structure is simple and the cost is low.

[0014] In this invention, the tube ejection action is completed by a ejector pin. Compared with structures that complete tube ejection by using a tube head and ejection trough or by using different friction forces, this invention rotates the ejection trough to the bottom after tube ejection, and the test tube will fall directly into the collection mechanism below. The ejection trough can be reset for the next use. Attached Figure Description

[0015] Figure 1 This is the main view of the automatic tube replacement device.

[0016] Figure 2 This is a top-view cross-sectional view of the automatic tube replacement device (tube removal status).

[0017] Figure 3 This is a top-view cross-sectional view of the automatic tube replacement device (in detection state).

[0018] Figure 4 This is a top-view cross-sectional view of the automatic tube replacement device (tube removal state).

[0019] Figure 5 This is a cross-sectional view of the storage box.

[0020] Figure 6 This is a diagram of the rotating block structure.

[0021] Figure 7 This is a simplified 3D diagram of the motor shared by the storage box and the rotating block (bearings, bearing housings, some mounting pulleys, and part of the frame of the bearing housing are omitted).

[0022] Figure 8 yes Figure 7 The main view.

[0023] Among them, 1 is the tube picking mechanism, 2 is the tube changing shaft, 3 is the ejector pin, 4 is the compression spring, 5 is the tube picking head, 6 is the sealing ring, 7 is the detection tube, 8 is the rotating block, 9 is the rotating shaft, 10 is the storage box, 11 is the tube outlet rotating shaft, 12 is the detector, 13 is the material picking trough, 14 is the material return trough, 15 is the collection mechanism, 16 is the frame, 17 is the position sensor, 18 is the limit switch, 19 is the motor, 20 is the transmission mechanism, and 21 is the mounting bracket. Detailed Implementation

[0024] In this invention, unless otherwise expressly specified and limited, the technical terms used in this application shall have the ordinary meaning understood by those skilled in the art. Terms such as “connected,” “linked,” “fixed,” and “set” shall be interpreted broadly, referring to fixed connections, detachable connections, or integral connections; direct connections or indirect connections via an intermediate medium; mechanical connections or electrical connections. Unless otherwise expressly specified and limited, “above” or “below” a second feature may mean that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, “above,” “on top of,” or “on top of” a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. “Below,” “under,” or “beneath” a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Relational terms such as “first,” “second,” etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms used in the description, such as “center,” “lateral,” “longitudinal,” “length,” “width,” “thickness,” “height,” “front,” “rear,” “left,” “right,” “up,” “down,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” “circumferential,” “clockwise,” and “counterclockwise,” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Figure 1-8As shown, an automatic tube replacement device includes a tube-picking mechanism 1 that moves linearly driven by a first driving mechanism; a rotating block 8 located to the right of the tube-picking mechanism 1 and rotated by a second driving mechanism, switching between a picking position, a retraction position, and a clearance position; a detector 12 located to the right of the rotating block 8; and a tube storage box 10 located above the rotating block 8 and fed single tubes by a third driving mechanism. The tube-picking mechanism 1 includes a tube-picking head 5 at its right end for placing the detector tube 7, and the tube-picking head 5 contains... A push pin 3 is positioned to move relative to the tube-taking head 5 to push out the detection tube 7; a material-taking position is provided with a material-taking groove 13 for receiving material from the upper storage box 10; the tube-taking head 5 moves to one end of the material-taking groove 13 to take away the detection tube 7; a material-returning position is provided with a material-returning groove 14, the tube-taking mechanism 1 puts the detected tube 7 into the material-returning groove 14 and separates it from the detection tube 7 through the push pin 3; when the material-returning position rotates to an opening facing downwards or at an angle downwards, the separated detection tube 7 falls from the material-returning groove 14, and a collection mechanism 15 is provided below the rotating block 8. The left and right positions here are only for expressing relative positions, not absolute left and right. The clearance position can be provided with clearance holes, or the rotating block 8 at this position can be positioned horizontally and lower than the height of the tube-taking mechanism 1. The clearance position only needs to ensure that the tube-taking mechanism 1 can move linearly to the detector 12 without obstruction, or return from the detector 12 to the initial position. The first driving mechanism can be a linear motor 19 mounted on the frame 16, which drives the tube-taking mechanism 1 to move. The first drive mechanism can also be a linear drive mechanism driven by other common motors 19. The collection mechanism 15 can be a collection box, etc. In this invention, the tube picking mechanism 1 only needs to perform linear movement to satisfy operations such as clamping the detection tube 7, moving the detection tube 7 to the detection point, moving the detected detection tube 7 to the unloading tank 14, and unloading the tube. The operation process is simple, the structure is simple, and the precision is high.

[0026] It also includes a position sensor 17 located next to the rotating block 8 to detect whether there is a detection tube 7 in the material handling position where the rotating block 8 is aligned with the tube handling mechanism 1; the first drive mechanism, the second drive mechanism, the third drive mechanism, the detector 12, and the position sensor 17 are all electrically connected to the controller. This invention allows the controller to set the time, number of detections, tube changing interval, etc. After setting the parameters, the controller controls the entire tube changing process automatically, eliminating the need for manual operation and effectively saving manpower. The position sensor 17 can be a common sensor such as a laser sensor, ultrasonic sensor, or infrared sensor. The sensor is located on the front or rear side of the rotating block 8, detecting the end of the detection tube 7 extending from the material handling position.

[0027] It also includes a mounting bracket 21 fixed on the frame 16. The tube picking mechanism 1 includes a tube changing shaft 2 slidably mounted on the mounting bracket 21. The tube changing shaft 2 has a push pin 3 at its right end. The tube picking head 5 is slidably mounted on the push pin 3. A compression spring 4 is provided on the push pin 3 between the tube changing shaft 2 and the tube picking head 5.

[0028] The tube-taking head 5 is provided with stepped through holes with smaller diameters at both ends and a larger diameter in the middle. A sealing ring 6 for clamping the detection tube 7 is provided in the right end hole of the stepped through hole. A limiting ring is provided on the ejector pin 3 near its right end, and the limiting ring can only move within the middle hole of the stepped through hole. When the right end of the ejector pin 3 is inserted into the right end hole, the ejector pin 3 pushes the detection tube 7 out of the tube-taking head 5. The limiting ring can be annular or other shapes, as long as it ensures movement only within the middle hole. The tube-taking head 5 is provided with stepped through holes, and the ejector pin 3 is provided with a limiting ring. Because the limiting ring cannot come out of the middle hole, the tube-taking head 5 and the ejector pin 3 will not separate during movement. The right end of the ejector pin 3 refers to the part of the ejector pin 3 located to the right of the limiting ring, and its diameter is smaller than the diameter of the right end hole of the stepped through hole, allowing it to be inserted into the right end hole to push out the detection tube 7. The sealing ring 6 can be made of rubber and is provided in the right end hole for inserting the detection tube 7, serving as a buffer and clamping mechanism.

[0029] The material receiving trough 13 is a blind hole with a V-shaped cross-section. The left end of the material receiving trough 13 extends to the left end face of the rotating block 8. The upper opening of the material receiving trough 13 receives the detection tube 7, and the length of the material receiving trough 13 is less than the length of the detection tube 7. The upper end of the material discharge trough 14 is an open end for material discharge. The material discharge trough 14 is a through hole or its length is greater than the length of the detection tube 7. When the detection tube 7 is placed in the material receiving trough 13, its left end extends out of the material receiving trough 13, facilitating the insertion of the tube receiving head 5. The material receiving trough 13 is V-shaped to facilitate receiving materials from the storage box 10 above. The material receiving trough 13 and the material discharge trough 14 are preferably spaced 180 degrees apart, but other angles are also possible without affecting the functionality. The position between the material receiving trough 13 and the material discharge trough 14, lower than the tube receiving mechanism 1, is a clearance position. The cross-section of the material discharge trough 14 can be semi-circular for easy dropping, or it can be other shapes. The upper end of the ejector trough 14 and the upper end of the take-up trough 13 refer to the upper end of the ejector trough 14 or the take-up trough 13 when rotated to a position corresponding to the height of the take-up mechanism 1. In this position, the ejector trough 14 can hold the test tube 7 and the ejector tube; the take-up trough 13 can hold the test tube 7 and allow it to enter the take-up mechanism 1. During ejection, the ejector trough 14 rotates to the upper position, and the tube-changing mechanism moves the tested test tube 7 towards the rotating block 8. The test tube 7 first enters the ejector trough 14. During the movement, the take-up head 5 first contacts the left side of the rotating block 8. Due to the obstruction of the rotating block 8, the take-up head 5 no longer moves to the right. At this time, the take-up mechanism 1 continues to drive the ejector pin 3 to move to the right, compressing the spring 4. The ejector pin 3 pushes the test tube 7 out of the take-up head 5 and completely into the ejector trough 14 of the rotating block 8. Therefore, the ejector trough 14 needs to be a through hole or a blind hole, but its length needs to be greater than the length of the test tube 7 to facilitate ejection. In this invention, the tube ejection action is completed by the ejector pin 3. Compared with structures that complete tube ejection through the tube take-up head 5 and the ejection groove 14, or by using different frictional forces, this invention allows the ejection groove 14 to be rotated to the bottom after tube ejection, causing the detection tube 7 to fall directly into the collection mechanism 15 below. The ejection groove 14 can then be reset for the next use. In structures where the ejection groove 14 employs a higher frictional force, the detection tube 7 will not fall out due to the greater friction and requires manual collection. The collection mechanism 15 can be made of a softer non-metallic material. Alternatively, it can be made of a metallic material with a soft silicone layer adhered inside to prevent the glass tube from falling and breaking.

[0030] The lower housing of the storage box 10 is provided with a feeding channel connecting to the internal storage space of the storage box 10. A cylindrical hole is provided within the feeding channel, and a correspondingly sized outlet rotating shaft 11 is installed within the cylindrical hole. The outlet rotating shaft 11 is driven to rotate by a third driving mechanism. The circumferential surface of the outlet rotating shaft 11 has an upper opening, allowing only one detection tube 7 to enter. (When the outlet rotating shaft 11 rotates to the point where the single tube opening faces upwards, one detection tube 7 from the storage box 10 enters the single tube opening. When the outlet rotating shaft 11 rotates to the point where the single tube opening faces downwards, the detection tube 7 falls from the feeding channel into the material receiving slot 13 of the rotating block 8 below.)

[0031] The second and third drive mechanisms share the same motor 19; the rotating block 8 is fixedly mounted on the rotating shaft 9; the rotating shaft 9 is rotatably mounted on the frame 16, and the rotating shaft 9 and the outlet rotating shaft 11 are connected and rotate synchronously via a transmission mechanism 20; the motor 19 drives either the rotating shaft 9 or the outlet rotating shaft 11 to rotate. The transmission mechanism 20 can be a synchronous belt drive, belt drive, gear drive, or other similar transmission mechanism. A bearing is mounted on the rotating shaft 9, housed in a bearing housing, which is mounted on the frame 16. A synchronous pulley is fixedly mounted on the rotating shaft 9. The output shaft of the motor 19 is fixedly connected to the outlet rotating shaft 11, and a synchronous pulley is fixedly mounted on either the output shaft of the motor 19 or the outlet rotating shaft 11. The two synchronous pulleys are driven by a synchronous belt. Some of the accompanying drawings omit the bearings, bearing housings, and the mounted frame 16, as these are existing technologies and can be omitted.

[0032] Initial position: When the single tube hole of the tube-discharging rotating shaft 11 faces downwards, the material-retrieving slot 13 of the rotating block 8 faces upwards. The detection tube 7 falls from the storage box 10 into the material-retrieving slot 13. The rotating block 8 rotates one revolution back to the initial position. During this process, the entire process of material retrieval, detection avoidance, tube retraction, and material dropping occurs, just in time for tube replacement. At this time, the tube-discharging rotating shaft 11 also rotates to the material-dropping position, restarting a working process. In this invention, the storage box 10 and the rotating block 8 are linked, and the same driving mechanism can meet the actions of each step, realizing the operations of material dropping, material retrieval, tube retraction, and material dropping. The structure is simple and the cost is low.

[0033] It also includes a mounting bracket 21 fixed to the frame 16, on which limit switches 18 are respectively provided at the left limit position, zero position, and right limit position along the moving direction of the pipe-taking mechanism 1. The limit switches 18 at the left limit position and the right limit position protect the equipment in case of error. The zero position is used to align with the initial position.

[0034] The present invention can be installed inside the gate. The pipe-taking mechanism 1, the rotating head, and the detector 12 can be installed in different positions of the gate as needed. That is, the frame 16 is part of the gate, or it can be installed on other mechanisms.

[0035] In specific implementation: 1. Initial state as follows Figure 1 As shown, at this time, the tube taking mechanism 1 is located at the leftmost end, the compression spring 4 is in a freely unfolded state, the rotating block 8 is in a vertical state, and its V-shaped material taking groove 13 is located at the top. 2. The outlet tube rotating shaft 11 rotates, causing a detection tube 7 to fall downwards; the detection tube 7 falls into the material receiving groove 13 of the rotating block 8 under the action of gravity; 3. Position sensor 17 detects an item at the end of the material-receiving slot 13 and sends a signal to the controller after confirming that the detection tube 7 is in position. The controller controls the tube-receiving mechanism 1 to move to the right. Since the material-receiving slot 13 of the rotating block 8 is a non-through slot, the detection tube 7 will be inserted into the sealing ring 6 inside the sliding block. At this time, the compression spring 4 is still in the deployed state. Alternatively, position sensor 17 can be omitted, and the movement of the tube-receiving mechanism 1 can be determined by setting an interval time. 4. The tube-retrieving mechanism 1 moves to the left, causing the detection tube 7 to leave the rotating block 8 and the material trough 13, thus completing the tube retrieval; the time and distance of the tube-retrieving mechanism 1 moving to the left are set in the controller. 5. After the tube-retrieving mechanism 1 moves to the point where the detection tube 7 is completely out of the retrieving trough 13, the controller activates the second drive mechanism, causing the rotating block 8 to rotate 90° clockwise or counterclockwise until it is in a horizontal position. At this time, the space above the rotating block 8 is a clearance position. The controller then controls the first drive mechanism to move the tube-retrieving mechanism 1 to the right, causing the detection tube 7 to be inserted into the detector 12. Figure 3 As shown; 6. When the detection tube 7 reaches the set number of detections or detection time and needs to be removed, a signal is sent to the controller. The controller controls the tube-removing mechanism 1 to move to the leftmost end, and the rotating block 8 is driven by the rotating shaft 9 to continue rotating 90° to a vertical position. At this time, its unloading groove 14 is at the top. 7. The tube-taking mechanism 1 moves to the right, and the detection tube 7 enters the unloading groove 14. During the movement, the tube-taking head 5 first contacts the rotating block 8. Due to the obstruction of the rotating block 8, the sliding block no longer moves to the right. At this time, the tube-taking mechanism 1 continues to drive the ejector pin 3 to move to the right, and the compression spring 4 will be compressed. The ejector pin 3 pushes the detection tube 7 out of the sliding block and completely into the unloading groove 14 of the rotating block 8. Figure 4 As shown; the tube-taking mechanism 1 moves to the left, and the rotating block 8 rotates 180°. During the rotation, when the opening of the unloading groove 14 is downward or tilted downward, the detection tube falls due to gravity. The rotating block 8 and the material-taking groove 13 are at the top, returning to the initial position, as shown. Figure 1 As shown; during this process, the timing and distance at which the pipe-taking mechanism 1 moves, and the timing of the rotation of the rotating block 8, are all set in the controller according to the actual situation, and the operation begins after the predetermined time. 10. Repeat steps 1-8 above.

[0036] The technical features of the embodiments described above can be combined in any way, and as long as there is no contradiction in the combination of these technical features, they should all be considered within the scope of this specification. Without departing from the overall concept of this invention, any technical solutions based on this invention, as well as equivalent substitutions or modifications, and various changes and improvements made, should also be considered within the scope of protection of this invention.

Claims

1. An automatic detection tube replacement device, characterized in that: The system includes a tube-picking mechanism that moves linearly driven by a first driving mechanism; a rotating block located to the right of the tube-picking mechanism and rotated by a second driving mechanism, its position shifting between a picking position, a retraction position, and a clearance position; a detector located to the right of the rotating block; and a storage box located above the rotating block and fed single tubes by a third driving mechanism. The tube-picking mechanism includes a picking head at its right end for placing the detector tube, with a push pin inside the picking head capable of moving relative to the picking head to eject the detector tube. The picking position has a picking groove for receiving material from the upper storage box. The picking head moves to one end of the picking groove to pick up the detector tube. The retraction position has a retraction groove where the tube-picking mechanism places the tested detector tube into the retraction groove and separates it from the detector tube by the push pin. When the retraction position is at the bottom, the separated detector tube falls from the retraction groove. A collection mechanism is located below the rotating block. The system also includes a mounting bracket fixed to the frame. The tube-taking mechanism includes a tube-changing shaft slidably mounted on a mounting frame, a push pin at the right end of the tube-changing shaft, a tube-taking head slidably mounted on the push pin, and a compression spring positioned between the push pin and the tube-taking head. The tube-taking head has stepped through holes with smaller diameters at both ends and a larger diameter in the middle. A sealing ring for clamping the detection tube is installed in the right end of the stepped through hole. A limiting ring is installed on the push pin near its right end, and the limiting ring can only move within the middle hole of the stepped through hole. When the right end of the push pin is inserted into the right end hole, the push pin pushes the detection tube out of the tube-taking head. The material-taking groove is a blind hole with a V-shaped cross-section, and its left end extends to the left end face of the rotating block. The upper end of the material-taking groove is open to receive the detection tube, and the length of the material-taking groove is less than the length of the detection tube. The upper end of the material-returning groove is an open end for discharging material. The material-returning groove is a through hole or its length is greater than the length of the detection tube.

2. The automatic detection tube replacement device according to claim 1, characterized in that: It also includes a position sensor located next to the rotating block to detect whether there is a detection tube in the material picking position where the rotating block is aligned with the tube picking mechanism; the first drive mechanism, the second drive mechanism, the third drive mechanism, the detector, and the position sensor are all electrically connected to the controller.

3. The automatic detection tube replacement device according to claim 2, characterized in that: The lower end of the storage box is provided with a feeding channel that connects to the internal storage space of the storage box. A cylindrical hole is provided in the feeding channel, and a tube outlet rotating shaft of corresponding size is provided in the cylindrical hole. The tube outlet rotating shaft is driven to rotate by a third driving mechanism. The circumferential surface of the tube outlet rotating shaft is provided with a single tube hole with an upper opening and only one detection tube can enter.

4. The automatic replacement device for detection tubes according to claim 3, characterized in that: The second and third drive mechanisms share the same motor; the rotating block is fixedly mounted on the rotating shaft; the rotating shaft is rotatably mounted on the frame, and the rotating shaft and the outlet rotating shaft are connected and rotate synchronously through a transmission mechanism; the motor drives either the rotating shaft or the outlet rotating shaft to rotate.

5. The automatic detection tube replacement device according to claim 1, characterized in that: It also includes a mounting bracket fixed on the frame, on which limit switches are respectively provided at the left limit position, zero position and right limit position along the moving direction of the tube picking mechanism.

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