Cam, one-way intermittent transmission mechanism, test strip transmission mechanism and sample analyzer

Abstract

The present invention first discloses a cam, including a cam body, wherein the outer contour of the cam body includes a first arc segment and a second arc segment, wherein a first curved segment and a second curved segment are respectively provided between the two ends of the first arc segment and the two ends of the second arc segment, and the first arc segment, the first curved segment, the second arc segment and the second curved segment form a closed curve; a rotating shaft is provided on the cam body, the centers of the first arc segment and the second arc segment both fall on the rotating shaft, and the curvature radius of the first arc segment is smaller than the curvature radius of the second arc segment; an eccentric shaft is provided on the cam body, and the line connecting the axis center of the eccentric shaft and the axis center of the rotating shaft intersects with the first arc segment or the second arc segment. The present invention also discloses a one-way intermittent transmission mechanism using the cam, a test strip transmission mechanism using the one-way intermittent transmission mechanism, and a sample analyzer.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical transmission, and specifically relates to a cam, a one-way intermittent transmission mechanism using the cam, a test strip transmission mechanism using the one-way intermittent transmission mechanism, and a sample analyzer. Background Art

[0002] During the test strip transmission process, the horizontal and vertical movement strokes are relatively short. The existing test strip transmission mechanism has multiple implementation methods: 1) Using two motors to control the horizontal and vertical movements respectively will lead to a complex structure and high cost of the transmission mechanism; 2) Using a synchronous belt transmission, the transmission rod on the synchronous belt will be stained with urine and cannot be cleaned, and the parallelism of the two synchronous belt transmission rods is not easy to ensure; 3) Using a connecting rod transportation mechanism, the transmission rod on the connecting rod mechanism can only move diagonally downward when leaving the test strip, and some crystals on the transmission rod will scrape the test strip, causing the test strip to tip over.

[0003] The Chinese patent with publication number CN208700145U discloses a test strip conveying mechanism, including a frame, and also including: a baffle connecting rod assembly for limiting the test strip, the baffle connecting rod assembly is installed on the frame through a main shaft and a slave shaft; a pulley assembly for transporting the test strip to the bottom of the test assembly, the pulley assembly is installed on the frame through a main wheel and a slave wheel, and the pulley assembly is located above the baffle connecting rod assembly; a drive control unit for driving the baffle connecting rod assembly and the pulley assembly, the drive control unit is installed on the frame; a waste box for collecting the test strip after the test is completed, the waste box is located at the tail of the pulley assembly, and a cleaning sponge is provided on the side of the waste box close to the pulley assembly. The test strip conveying mechanism uses a combination of a synchronous belt and a connecting rod mechanism to convey the test strip, and needs to be controlled by two motors respectively. The structure is complex and the cost is high, and there is still a problem of urine contamination on the synchronous belt, so a cleaning sponge needs to be used for cleaning, but the cleaning effect of the cleaning sponge is limited.

[0004] The Chinese patent application with publication number CN109406766A discloses a mechanism for transmitting test strips, including a rotating shaft mounting seat; a test strip clip rotating shaft is provided on the upper part of the rotating shaft mounting seat; a test strip clip sliding rod is provided on the test strip clip rotating shaft, and both sides of the test strip clip sliding rod extend to the lower part of the rotating shaft mounting seat; a test strip clip is provided on the test strip clip sliding rod, and the test strip clip includes an upper test strip clip and a lower test strip clip; a lifting rod support is provided below the lower test strip clip, and a test strip for pushing the lower test strip clip up is provided on the lifting rod support The test strip clamp lifting rod is provided with a lifting rod cam below the test strip clamp lifting rod, and the top surface of the lifting rod cam contacts the bottom surface of the test strip clamp lifting rod; the lifting rod cam is installed on the motor shaft; one end of the motor shaft is connected to the motor shaft mounting seat, and the other end of the motor shaft is connected to the coupling, and the coupling is installed on the motor mounting seat, and the motor mounting seat is provided with a motor; a sliding rod crank for pushing the test strip clamp sliding rod to move left and right is provided on the motor shaft between the lifting rod cam and the motor shaft mounting seat. Although the mechanism for transmitting the test strip uses one motor to realize movement in two directions, it only shakes up and down to make the test strip fully absorb liquid, which does not meet the requirements of intermittent transportation of the test strip. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a cam, a one-way intermittent transmission mechanism, a test strip transmission mechanism and a sample analyzer, which can meet the requirements of intermittent transmission of test strips and will not be contaminated by liquid substances such as urine.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention first proposes a cam, comprising a cam body, wherein the outer contour of the cam body comprises a first arc segment and a second arc segment, a first curved segment and a second curved segment are respectively provided between two ends of the first arc segment and two ends of the second arc segment, and the first arc segment, the first curved segment, the second arc segment and the second curved segment form a closed curve;

[0008] The cam body is provided with a rotating shaft, the centers of the first arc segment and the second arc segment both fall on the rotating shaft, and the curvature radius of the first arc segment is smaller than the curvature radius of the second arc segment;

[0009] An eccentric shaft is provided on the cam body, and a line connecting the axis of the eccentric shaft and the axis of the rotating shaft and an outer contour line of the cam body have two intersection points, one of which falls on the first circular arc segment (1) or the second circular arc segment.

[0010] Furthermore, of the two intersection points between a line connecting the axis center of the eccentric shaft and the axis center of the rotating shaft and an outer contour line of the cam body, another intersection point falls on the first curved segment or the second curved segment.

[0011] Furthermore, the distances of the first curved line segment and the second curved line segment from the rotation axis gradually decrease from the end thereof connected to the second circular arc segment to the end thereof connected to the first circular arc segment.

[0012] Furthermore, the symmetry lines of the first arc segment and the second arc segment are collinear.

[0013] Furthermore, the first curved line segment and the second curved line segment are arranged in axisymmetry with respect to a symmetry line of the first circular arc segment.

[0014] Further, the radian of the first arc segment is π, and the radian of the second arc segment is π / 3.

[0015] Furthermore, the axis center of the eccentric shaft falls on a line connecting one end of the second arc segment and the rotating shaft.

[0016] The present invention also proposes a one-way intermittent transmission mechanism, comprising a base, a first guide rail is provided on the base, a first bracket slidably matched with the first guide rail is provided on the first bracket, a second guide rail is provided on the first bracket, and a second bracket slidably matched with the second guide rail is provided on the second bracket; a limit shaft and the cam 16 as described above are provided between the first bracket and the second bracket;

[0017] The cam is arranged on the first bracket, the limiting shaft is arranged on the second bracket and keeps in contact with the outer peripheral wall of the cam, and the first bracket is provided with a motor for driving the cam to rotate; or the cam is arranged on the second bracket, the limiting shaft is arranged on the first bracket and keeps in contact with the outer peripheral wall of the cam, and the second bracket is provided with a motor for driving the cam to rotate;

[0018] A double-hinged connecting rod is arranged between the eccentric shaft and the base.

[0019] Furthermore, a fixed shaft is provided on the base, and two ends of the double-hinged connecting rod are hingedly connected to the eccentric shaft and the fixed shaft respectively.

[0020] Furthermore, a plane passing through the axis of the fixed shaft and the axis of the rotating shaft is parallel to the first guide rail.

[0021] Furthermore, a plane passing through the axis of the rotating shaft and the axis of the limiting shaft is parallel to the second guide rail.

[0022] Furthermore, the first guide rail and the second guide rail are perpendicular to each other.

[0023] Furthermore, a bearing is provided on the limiting shaft, and the bearing is always in contact with the outer peripheral wall of the cam.

[0024] Furthermore, a tension spring is provided between the second bracket and the first bracket to keep the limiting shaft and the outer peripheral wall of the cam in contact and fit at all times.

[0025] The present invention also proposes a test strip conveying mechanism, including the one-way intermittent conveying mechanism as described above, wherein the base is provided with a table for placing the test strips, and the second bracket is provided with a conveying plate for driving the test strips to be intermittently conveyed on the table.

[0026] Furthermore, the transmission plates are configured as at least two parallel plates, and transmission teeth for driving the test strips forward are provided at intervals on the transmission plates; in the same transmission plate, the spacing between two adjacent transmission teeth is equal to the spacing between two adjacent test strips.

[0027] Further, the limiting shaft is located below the cam, and a line connecting the axis of the eccentric shaft and the axis of the rotating shaft intersects with the first arc segment; or,

[0028] The limiting shaft is located above the cam, and a line connecting the axis center of the eccentric shaft and the axis center of the rotating shaft intersects with the second circular arc segment.

[0029] The present invention also provides a sample analyzer, comprising the test strip conveying mechanism as described above.

[0030] The beneficial effects of the present invention are:

[0031] The test strip transmission mechanism of the present invention is provided with a one-way intermittent transmission mechanism, and the first bracket is slidably mounted on the first guide rail, and the second bracket is slidably mounted on the second guide rail, so that the second bracket can make a planar motion relative to the base under the guiding action of the first guide rail and the second guide rail; by providing a cam on the first bracket and a limit shaft on the second bracket, the cam and the limit shaft always keep in contact and cooperation, so that the second bracket can be driven to move along the second guide rail; by providing an eccentric shaft on the cam, and providing a double-hinged connecting rod between the eccentric shaft and the base, so that the rotation of the cam can drive the first bracket to move along the first guide rail, and drive the second bracket to move along the first guide rail; that is, the second bracket can move relative to the base in two directions along the first guide rail and the second guide rail at the same time, thereby achieving the technical purpose of the same motor driving the second bracket to move in two directions;

[0032] By setting the outer contour of the cam to include a first arc segment and a second arc segment, and respectively setting a first curve segment and a second curve segment transition connection between the first arc segment and the second arc segment, when the first arc segment or the second arc segment contacts and cooperates with the limit shaft, the height of the second bracket remains unchanged, that is, the second bracket has a first straight stroke segment corresponding to the first arc segment and a second straight stroke segment corresponding to the second arc segment, and the height of the second bracket is adjusted by the first curve segment and the second curve segment between the first straight stroke segment and the second straight stroke segment, which are respectively used to convey the test strip forward and reset the second bracket.

[0033] By setting the line between the axis center of the eccentric shaft and the axis center of the rotating shaft to intersect with the first arc segment or the second arc segment, that is, when the first straight stroke section of the second bracket corresponding to the first arc segment is used to convey the test strip forward, the line between the axis center of the eccentric shaft and the axis center of the rotating shaft is set to intersect with the first arc segment. After the second bracket conveys the test strip forward to the maximum distance, under the action of the eccentric shaft and the double-hinged connecting rod, the second bracket moves backward for a short distance, so that the second bracket is separated from the test strip, and then the height of the second bracket is adjusted to reset, which will not cause the test strip to tip over. At this time, the first straight stroke section The second straight stroke section includes a forward conveying stroke section and a backward disengagement stroke section; similarly, when the second bracket corresponds to the second straight stroke section of the second arc section and is used to convey the test strip forward, the line between the axis center of the eccentric shaft and the axis center of the rotating shaft is set to intersect with the second arc section. After the second bracket conveys the test strip forward to the maximum distance, under the action of the eccentric shaft and the double-hinged connecting rod, the second bracket moves backward a short distance to disengage the second bracket from the test strip, and then the height of the second bracket is adjusted to reset, which will not cause the test strip to tip over. At this time, the second straight stroke section includes a forward conveying stroke section and a backward disengagement stroke section.

[0034] In summary, the test strip conveying mechanism of the present application, by setting up a one-way intermittent conveying mechanism, can meet the requirements of intermittent transportation of test strips, and will not be contaminated by liquid substances such as urine; by setting the line between the axis center of the eccentric shaft and the axis center of the rotating shaft to intersect with the first arc segment or the second arc segment, the second bracket will move backward a short distance after conveying the test strip to the maximum distance of a single transmission, and then adjust the reset stroke height of the second bracket after the second bracket is completely separated from the test strip, which can avoid the problem of causing the test strip to tip over. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0036] Figure 1 It is a structural schematic diagram of an embodiment of a test strip transmission mechanism of the present invention;

[0037] Figure 2 It is a structural schematic diagram of a one-way intermittent transmission mechanism;

[0038] Figure 3 It is a structural diagram of the cam;

[0039] Figure 4 Schematic diagram of the operating principle of the one-way intermittent transmission mechanism of this embodiment;

[0040] Figure 5 Run a route map for the loop of the second stand.

[0041] Description of reference numerals:

[0042] 1-first arc segment; 2-second arc segment; 3-first curved segment; 4-second curved segment; 5-cam body; 6-rotating shaft; 7-eccentric shaft;

[0043] 11-base; 12-first guide rail; 13-first bracket; 14-second guide rail; 15-second bracket; 16-cam; 17-limiting shaft; 18-double-hinged connecting rod; 19-fixed shaft; 20-bearing; 21-test strip; 22-table; 23-transmission plate; 24-transmission gear. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0045] The sample analyzer of this embodiment includes a test strip transmission mechanism. Figure 1 As shown, the test strip conveying mechanism of this embodiment includes a one-way intermittent conveying mechanism. Figure 2 As shown, the one-way intermittent conveying mechanism of this embodiment includes a base 11, a first guide rail 12 is provided on the base 11, a first bracket 13 slidably matched with the first guide rail 12 is provided on the first guide rail 12, a second guide rail 14 is provided on the first bracket 13, and a second bracket 15 slidably matched with the second guide rail 14 is provided on the second guide rail 14.

[0046] A limit shaft 17 and a cam 16 are provided between the first bracket 13 and the second bracket 15. The cam 16 is provided on the first bracket 13, the limit shaft is provided on the second bracket 15 and is always in contact with the outer peripheral wall of the cam 16, and a motor for driving the cam 16 to rotate is provided on the first bracket 13; or, the cam 16 is provided on the second bracket 15, the limit shaft is provided on the first bracket 13 and is always in contact with the outer peripheral wall of the cam 16, and a motor for driving the cam 16 to rotate is provided on the second bracket 15. The cam 16 of this embodiment is provided on the first bracket 13, the limit shaft is provided on the second bracket 15 and is always in contact with the outer peripheral wall of the cam 16, and a motor for driving the cam 16 to rotate is provided on the first bracket 13. A double hinge connecting rod 18 is provided between the eccentric shaft 7 and the base 11 of this embodiment.

[0047] like Figure 3 As shown, the cam of this embodiment comprises a cam body 5, the outer contour of the cam body 5 comprises a first arc segment 1 and a second arc segment 2, the first curved segment 3 and the second curved segment 4 are respectively provided between the two ends of the first arc segment 1 and the two ends of the second arc segment 2, and the first arc segment 1, the first curved segment 3, the second arc segment 2 and the second curved segment 4 form a closed curve; the cam body 5 is provided with a rotating shaft 6, the centers of the first arc segment 1 and the second arc segment 2 both fall on the rotating shaft 6, and the curvature radius of the first arc segment 1 is smaller than the curvature radius of the second arc segment 2; the cam body 5 is provided with an eccentric shaft 7, and the line between the axis of the eccentric shaft 7 and the axis of the rotating shaft 6 and the outer contour of the cam body 5 has two intersections, one of which falls on the first arc segment 1 or the second arc segment 2. The second bracket 15 of this embodiment is provided with a limiting shaft 17 that always keeps in contact with the outer peripheral wall of the cam 16, and a double hinge connecting rod 18 is provided between the eccentric shaft 7 and the base 11. In this embodiment, a table 22 for placing the test strip 21 is provided on the base 11 , and a conveying plate 23 for driving the test strip 21 to be intermittently conveyed on the table 22 is provided on the second bracket 15 .

[0048] Further, a fixed shaft 19 is provided on the base 11, and the two ends of the double-hinged connecting rod 18 are respectively hingedly connected to the eccentric shaft 7 and the fixed shaft 19. The fixed shaft 19 of this embodiment is parallel to the rotating shaft 6. Preferably, the plane passing through the axis of the fixed shaft 19 and the axis of the rotating shaft 6 is parallel to the first guide rail 12. In this way, under the action of the fixed shaft 19, the double-hinged connecting rod 18 and the eccentric shaft 7, when the cam 16 rotates around its rotating shaft 6, the first bracket 13 can be driven to move along the first guide rail 12. Preferably, the plane passing through the axis of the rotating shaft 6 and the axis of the limiting shaft 17 is parallel to the second guide rail 14. Since the distance between the profile of the cam 16 and its rotating shaft 6 is not equal, under the cooperation of the cam 16 and the limiting shaft 17, the second bracket 15 can be driven to move along the second guide rail 14. The first guide rail 12 and the second guide rail 14 of this embodiment are perpendicular to each other. Specifically, the first guide rail 12 of this embodiment is located in the horizontal direction, and the second guide rail 14 is located in the vertical direction.

[0049] Furthermore, a bearing 20 is provided on the limit shaft 17, and the bearing 20 always keeps in contact with the outer peripheral wall of the cam 16, so that the limit shaft 17 and the cam 16 are rollingly matched, reducing wear and resistance. A tension spring is provided between the second bracket 15 and the first bracket 13 of this embodiment to keep the limit shaft 17 and the outer peripheral wall of the cam 16 always in contact with each other.

[0050] Furthermore, the transmission plates 23 are provided with at least two parallel plates, and transmission teeth 24 for driving the test strips to be transmitted forward are provided at intervals on the transmission plates 23; in the same transmission plate 23, the spacing between two adjacent transmission teeth 24 is equal to the spacing between two adjacent test strips 21. Specifically, the transmission teeth 24 of this embodiment are set to be 6 at intervals, and the frontmost transmission tooth 24 is used to transport the test strips 21 that have been tested out of the test strip transmission mechanism, and the other 5 transmission teeth 24 are used to intermittently transmit the test strips 21 to the detection station. It takes 60 seconds for the test strips 21 to go from the initial position to the detection station. There are 5 test strips 21 on the platen 22, and each test strip 21 needs to go through 4 intermittent transmissions from the initial position to the detection station, that is, the interval time of each intermittent transmission is 15 seconds, that is, the time for the cam 16 to rotate one circle is 15 seconds.

[0051] Furthermore, of the two intersections between the line connecting the axis of the eccentric shaft 7 and the axis of the rotating shaft 6 and the outer contour of the cam body 5, the other intersection falls on the first curved segment 3 or the second curved segment 4, thereby preventing the second bracket 15 from also moving in the reverse direction during the resetting process. The distances between the first curved segment 3 and the second curved segment 4 and the rotating shaft 6 gradually decrease from the end thereof connected to the second arc segment 2 to the end thereof connected to the first arc segment 1, so that the height of the second bracket 15 gradually decreases or increases during the process of adjusting the height between the first straight stroke segment and the second straight stroke segment, thereby avoiding the height fluctuation and improving the stability.

[0052] Further, when the limit shaft 17 is located below the cam 16, the line between the axis center of the eccentric shaft 7 and the axis center of the rotating shaft 6 intersects with the first arc segment 1. At this time, the height of the first straight stroke section of the second bracket 15 corresponding to the first arc segment 1 is higher than the second straight stroke section corresponding to the second arc segment 2, that is, the first straight stroke section of the second bracket 15 corresponding to the first arc segment 1 is used to convey the test strip forward, and the line between the axis center of the eccentric shaft 7 and the axis center of the rotating shaft 6 intersects with the first arc segment 1, so that the first straight stroke section has a forward conveying stroke section and a backward disengagement stroke section. Similarly, when the limit shaft 17 is located above the cam 16, the line between the axis center of the eccentric shaft 7 and the axis center of the rotating shaft 6 intersects with the second arc segment 2. At this time, the height of the second straight stroke section of the second bracket 15 corresponding to the second arc segment 2 is higher than the first straight stroke section corresponding to the first arc segment 1, that is, the second straight stroke section of the second bracket 15 corresponding to the second arc segment 2 is used to convey the test strip forward, and the line between the axis center of the eccentric shaft 7 and the axis center of the rotating shaft 6 intersects with the second arc segment 2, so that the second straight stroke section has a forward conveying stroke section and a backward disengagement stroke section.

[0053] Furthermore, in this embodiment, the symmetry lines of the first arc segment 1 and the second arc segment 2 are collinear. The first curved segment 3 and the second curved segment 4 are arranged axially symmetrically with respect to the symmetry line of the first arc segment 1. Figure 3 As shown, the radian of the first arc segment 1 of this embodiment is π, and the radian of the second arc segment 2 is π / 3. The limit shaft 17 of this embodiment is located below the cam 16, and the axis of the eccentric shaft 7 falls on the line between one end of the second arc segment 2 and the rotating shaft 6, that is, the line between the axis of the eccentric shaft 7 and the axis of the rotating shaft 6 is connected to the end of the first curved segment 3 or the second curved segment 4 connected to the second arc segment 2.

[0054] like Figure 4 and Figure 5 As shown, the operation process of the one-way intermittent transmission mechanism of this embodiment is as follows:

[0055] The initial 0° position is when the axis of the cam 16 , the axis of the eccentric shaft 7 and the axis of the fixed shaft 19 are located in the same plane and the rotating shaft 6 of the cam 16 is located between the eccentric shaft 7 and the fixed shaft 19 .

[0056] The first stage (0°-90°): the cam 16 rotates clockwise, and the second bracket 15 moves forward; when the cam 16 rotates relatively within the range of 0°-30°, the limit shaft 17 contacts and cooperates with the first curved segment 3, and the height of the transmission plate 23 gradually rises to the highest position, that is, the transmission plate 23 is located in the rising stroke segment EA and gradually moves to point A; when the cam 16 rotates to the range of 30°-90°, the limit shaft 17 contacts and cooperates with the first arc segment 1, and the transmission plate 23 is located in the transmission stroke segment AB and keeps the height unchanged; in particular, when the cam 16 rotates to 55°, the transmission plate 23 contacts with the test strip 21, pushing the test strip to move forward;

[0057] The second stage (90°-180°): the limiting shaft 17 always keeps in contact with the first arc segment 1, and the transmission plate 23 continues to transmit the test strip 21 forward, that is, the transmission plate 23 is always in the transmission stroke section AB and runs to the end B of the transmission stroke section AB;

[0058] The third stage (180°-270°): the transmission bracket 15 moves backward; when the rotation angle of the cam 16 is within the range of 180°-210°, the height of the transmission plate 23 remains unchanged and moves backward to disengage from the test strip 21, that is, the transmission plate 23 is in the disengagement stroke section BC; when the rotation angle of the cam 16 is within the range of 210°-270°, the limit shaft 17 contacts and cooperates with the second curved section 4, the transmission bracket 15 moves backward, and the height of the transmission plate 23 begins to decrease, that is, the transmission plate 23 is in the descending stroke section CD and gradually decreases in height; when the cam 16 rotates to 270°, the transmission plate 23 is at the end D of the descending stroke section CD;

[0059] In the fourth stage (270°-360°), the transmission bracket 15 moves backward, and when the rotation angle of the cam 16 is in the range of 270°-330°, the limit shaft 17 contacts and cooperates with the second arc segment 2, and the transmission plate 23 resets backward and is in the second straight stroke segment DE; when the rotation angle of the cam 16 is in the range of 330°-360°, the limit shaft 17 contacts and cooperates with the first curved segment 3, that is, the transmission plate 23 is in the ascending stroke segment EA, and the position of the transmission plate 23 gradually increases; the eccentric shaft 7 returns to the initial 0° position.

[0060] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A one-way intermittent transmission mechanism, characterized in that: The base (11) comprises a first guide rail (12) provided on the base (11), a first bracket (13) slidably matched with the first guide rail (12) provided on the first guide rail (12), a second guide rail (14) provided on the first bracket (13), and a second bracket (15) slidably matched with the second guide rail (14); A limiting shaft (17) and a cam (16) for driving the second bracket (15) to move along the second guide rail (14) are provided between the first bracket (13) and the second bracket (15); The cam (16) is arranged on the first bracket (13), the limiting shaft is arranged on the second bracket (15) and is always in contact with the outer peripheral wall of the cam (16), and the first bracket (13) is provided with a motor for driving the cam (16) to rotate; or, the cam (16) is arranged on the second bracket (15), the limiting shaft is arranged on the first bracket (13) and is always in contact with the outer peripheral wall of the cam (16), and the second bracket (15) is provided with a motor for driving the cam (16) to rotate; The cam (16) comprises a cam body (5), the outer contour of the cam body (5) comprises a first arc segment (1) and a second arc segment (2), a first curved segment (3) and a second curved segment (4) are respectively provided between two ends of the first arc segment (1) and two ends of the second arc segment (2), and the first arc segment (1), the first curved segment (3), the second arc segment (2) and the second curved segment (4) form a closed curve; The cam body (5) is provided with a rotating shaft (6), the centers of the first circular arc segment (1) and the second circular arc segment (2) both fall on the rotating shaft (6), and the curvature radius of the first circular arc segment (1) is smaller than the curvature radius of the second circular arc segment (2); An eccentric shaft (7) is provided on the cam body (5), and a line connecting the axis of the eccentric shaft (7) and the axis of the rotating shaft (6) and an outer contour line of the cam body (5) have two intersection points, one of which falls on the first circular arc segment (1) or the second circular arc segment (2); Of the two intersection points between a line connecting the axis of the eccentric shaft (7) and the axis of the rotating shaft (6) and an outer contour line of the cam body (5), the other intersection point falls on the first curved segment (3) or the second curved segment (4); A double-hinged connecting rod (18) is provided between the eccentric shaft (7) and the base (11); The distances of the first curved segment (3) and the second curved segment (4) from the rotation axis (6) gradually decrease from the end connected to the second circular arc segment (2) to the end connected to the first circular arc segment (1).

2. The one-way intermittent transmission mechanism according to claim 1, characterized in that: The symmetry lines of the first circular arc segment (1) and the second circular arc segment (2) are collinear.

3. The one-way intermittent transmission mechanism according to claim 2, characterized in that: The first curved segment (3) and the second curved segment (4) are arranged in an axisymmetric manner relative to a symmetry line of the first circular arc segment (1).

4. The one-way intermittent transmission mechanism according to claim 3, characterized in that: The radian of the first circular arc segment (1) is π, and the radian of the second circular arc segment (2) is π / 3.

5. The one-way intermittent transmission mechanism according to claim 4, characterized in that: The axis center of the eccentric shaft (7) falls on the line between one end of the second arc segment (2) and the rotating shaft (6).

6. The one-way intermittent transmission mechanism according to claim 1, characterized in that: A fixed shaft (19) is provided on the base (11), and two ends of the double-hinged connecting rod (18) are respectively hingedly connected to the eccentric shaft (7) and the fixed shaft (19).

7. The one-way intermittent transmission mechanism according to claim 6, characterized in that: At the same time, a plane passing through the axis of the fixed shaft (19) and the axis of the rotating shaft (6) is parallel to the first guide rail (12).

8. The one-way intermittent transmission mechanism according to claim 1, characterized in that: At the same time, a plane passing through the axis of the rotating shaft (6) and the axis of the limiting shaft (17) is parallel to the second guide rail (14).

9. The one-way intermittent transmission mechanism according to claim 1, characterized in that: The first guide rail (12) and the second guide rail (14) are perpendicular to each other.

10. The one-way intermittent transmission mechanism according to claim 1, characterized in that: A bearing (20) is provided on the limiting shaft (17), and the bearing (20) always maintains contact and fit with the outer peripheral wall of the cam (16).

11. The one-way intermittent transmission mechanism according to any one of claims 1, 7 to 10, characterized in that: A tension spring is provided between the second bracket (15) and the first bracket (13) to enable the limiting shaft (17) to always maintain contact and fit with the outer peripheral wall of the cam (16).

12. A test strip conveying mechanism, characterized in that: The one-way intermittent transmission mechanism comprises the one-way intermittent transmission mechanism as claimed in any one of claims 1 to 11, wherein the base (11) is provided with a table (22) for placing the test strip (21), and the second bracket (15) is provided with a transmission plate (23) for driving the test strip (21) to be intermittently transmitted on the table (22).

13. The test strip conveying mechanism according to claim 12, characterized in that: The transmission plates (23) are provided in a configuration of at least two mutually parallel pieces, and transmission teeth (24) are provided at intervals on the transmission plates (23) for driving the test strips to be transmitted forward; in the same transmission plate (23), the spacing between two adjacent transmission teeth (24) is equal to the spacing between two adjacent test strips (21).

14. The test strip conveying mechanism according to claim 12 or 13, characterized in that: The limiting shaft (17) is located below the cam (16), and a line connecting the axis of the eccentric shaft (7) and the axis of the rotating shaft (6) intersects with the first circular arc segment (1); or, The limiting shaft (17) is located above the cam (16), and a line connecting the axis center of the eccentric shaft (7) and the axis center of the rotating shaft (6) intersects with the second circular arc segment (2).

15. A sample analyzer, characterized in that: It comprises a test strip conveying mechanism as described in any one of claims 12 to 14.

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