Blood type card test tube rack convenient to observe and test tube rack assembly

Abstract

The utility model belongs to the technical field of medical supplies, and particularly discloses a blood type card test tube rack convenient to observe and a test tube rack assembly, and the test tube rack comprises side plates, a bottom plate and an upper plate, the two side plates are symmetrically arranged on the two sides of the upper end of the bottom plate. The upper plate is arranged at the upper ends of the two side plates, and a plurality of upper insertion holes are uniformly distributed in the upper plate in the direction perpendicular to the side plates; the bottom plate is placed on an experiment table top, meanwhile, the two side plates extend upwards to stably support the upper plate, so that a firm frame structure is formed, it is ensured that the test tube rack is stably placed, and the test tube rack cannot shake due to external force or vibration in the operation process; and secondly, the blood type card is inserted into the upper insertion hole, and the label area of the blood type card faces the opening formed by the side plate, the bottom plate and the upper plate, so that the reaction area and the label area of the blood type card can be conveniently observed in the sample adding process, and confusion possibly caused by sight shielding is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical supplies, more particularly, relate to a blood group card test tube rack and test tube rack assembly convenient to observe. BACKGROUND

[0002] Blood group card is a tool for rapid detection and identification of human blood type, widely used in hospitals, blood banks, clinics and other medical environments. It usually contains test paper or gel with specific antibodies, which can react with the red cell surface antigens in the blood sample through simple operation steps, so as to judge the blood type by the results observed by naked eye, help medical staff to quickly determine the blood type of patients, so as to prepare for blood transfusion treatment or operation in emergency. The main components of blood group card include: reaction zone, each reaction zone is pre-coated with specific antibody reagent, used for detecting A, B, AB and O type blood group antigens; sample adding area, the area for adding the sample to be tested, usually designed as a groove or hole and communicated with the reaction zone, convenient for accurate addition of sample; label area, used for recording and identifying the key information related to blood type identification, avoiding confusion between samples, ensuring the accuracy of each sample detection result.

[0003] During the use of blood group card, blood group card test tube rack is usually used for temporary storage. In the prior art, the Chinese patent with document number CN219942916U discloses a multifunctional test tube rack for sterile test, which comprises a straight test tube rack assembly and an inclined test tube rack assembly, the inclined test tube rack assembly is arranged at any one end or both ends of the length direction of the straight test tube rack assembly; the straight test tube rack assembly comprises a support plate, an upper plate, a middle plate, a supporting plate and a straight test tube jack, the support plate comprises two, one side of each of the two support plates is connected with the supporting plate, the other side of each of the two support plates is connected with the upper plate, the middle plate is arranged between the upper plate and the supporting plate, and the straight test tube jack is arranged on the upper plate and the middle plate; the inclined test tube rack assembly comprises a side support plate, a side upper plate, a side middle plate and an inclined test tube jack, the side support plate comprises two, one side of each of the two side support plates is connected with the support plate, the other side of each of the two side support plates is connected with the side upper plate, the side middle plate is arranged between the side upper plate and the support plate, and the inclined test tube jack is arranged on the side upper plate and the side middle plate. The Chinese patent with document number CN221433141U discloses a multifunctional test tube rack, relating to the technical field of medical detection auxiliary devices. The multifunctional test tube rack comprises a base and a rotating tray rotatably connected above the base; the rotating tray comprises a first layer of support disc, a second layer of support disc and a third layer of support disc from top to bottom. The multifunctional test tube rack of the utility model, through the setting of the stepped support disc, makes convenient for the specimen to be taken, sets up the hole position containing different test tubes simultaneously, improves the convenience of different specimen collection, saves the space simultaneously, in addition, through setting spring piece in the hole, can adapt to many different diameter specifications test tube, and guarantees the stability of test tube transfer.

[0004] Although the multifunctional test tube rack in the above-mentioned patent can adapt to test tubes with different diameters and angles, it is not suitable for storing blood group cards because the blood group cards have a whole plate structure and clear observation of the label area and the reaction area is required during sample adding to avoid confusion. Therefore, it is urgent to develop a specially designed blood group card test tube rack to facilitate observation and management and ensure the accuracy and efficiency of operation. Content of the utility model

[0005] In view of the above defects or improvement needs of the prior art, the utility model provides a blood group card test tube rack convenient to observe and test tube rack assembly, through placing the bottom plate on the experiment table surface, two side plates extend upward to stably support the upper plate, thereby forming a firm frame structure, ensuring that the test tube rack is stably placed, so that shaking does not occur during operation because of external force or vibration, secondly, the blood group card is inserted into the upper insertion hole, and the label area of the blood group card faces the opening formed by the side plate, the bottom plate and the upper plate, so that the reaction area and the label area of the blood group card can be observed conveniently during sample adding, greatly reducing the confusion that may be caused by the obstruction of the line of sight, in addition, when processing multiple samples, the blood group card after sample adding is transferred to the upper insertion hole away from the observation opening direction, and the blood group card to be added is always kept in the upper insertion hole near the opening, thereby reducing unnecessary movement and operation, further reducing the risk of sample confusion, improving the efficiency and accuracy of the experiment.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a blood group card test tube rack convenient to observe, which comprises: side plate, bottom plate and upper plate, wherein:

[0007] Two side plates are symmetrically arranged on both sides of the upper end of the bottom plate, and the upper plate is arranged on the upper end of the two side plates and is uniformly distributed with a plurality of upper insertion holes perpendicular to the direction of the side plate.

[0008] Further, the height from the contact surface of the bottom plate with the blood group card to the upper surface of the upper plate is less than the height of the blood group card and greater than the height of the reaction area.

[0009] Further, a plurality of lower clamping grooves are arranged on the upper surface of the bottom plate, the lower clamping grooves correspond to the positions of the upper insertion holes, and the number of the lower clamping grooves is the same as that of the upper insertion holes.

[0010] Further, a plurality of through holes are uniformly arranged on the two side plates, and the two test tube racks are connected through a connecting piece and a plurality of through holes.

[0011] The number of the through holes on the side plate is at least four.

[0012] The connecting piece comprises a buckle assembly, a magnetic assembly, a bolt assembly or a bolt assembly.

[0013] The utility model discloses another aspect provides a blood group card test tube rack assembly convenient for observation, including the test tube rack as described above, and the bottom plate both sides are equipped with slide or side plate both sides are equipped with side slot,

[0014] The test tube rack assembly further comprises an expansion seat and a limiting piece; the expansion seat is overall rectangular, and a T-shaped slot is arranged at the upper end thereof; the limiting piece is arranged at the upper end of the T-shaped slot wing plate.

[0015] Further, the limiting piece comprises a fixing seat, a limiting shaft, a baffle and a spring, wherein:

[0016] The fixing seat is hollow inside and arranged at the upper end of the T-shaped slot wing plate;

[0017] The limiting shaft is divided into three sections from the T-shaped slot to the outside of the fixing seat, the first section is vertically arranged above the T-shaped slot, the third section sequentially passes through the fixing seat and the T-shaped slot wing plate to the inside of the T-shaped slot, and the second section is connected to the upper end of the first section and the third section at both ends respectively;

[0018] The baffle is arranged inside the fixing seat and sleeved outside the third section of the limiting shaft;

[0019] The spring is arranged inside the fixing seat and sleeved outside the third section of the limiting shaft, and both ends thereof are connected to the upper surface of the baffle and the upper surface inside the fixing seat respectively;

[0020] The length of the first section of the limiting shaft arranged in the T-shaped slot and the distance from the bottom surface of the baffle to the bottom surface inside the fixing seat are both not less than the length of the third section of the limiting shaft arranged in the T-shaped slot.

[0021] Further, the distance from the bottom surface of the baffle to the bottom surface inside the fixing seat is less than the sum of the length of the third section of the limiting shaft arranged in the T-shaped slot and the height of the T-shaped slot wing plate,

[0022] Or the baffle and the inside of the fixing seat have the same horizontal cross-sectional shape.

[0023] Further, when one end of the T-shaped slot is closed, one limiting piece is symmetrically arranged at the upper end of each of the two T-shaped slot wing plates.

[0024] Further, when both ends of the T-shaped slot are open, the test tube rack assembly is provided with four limiting pieces, and each of the limiting pieces is arranged at the two ends of the T-shaped slot wing plate.

[0025] Further, the test tube rack assembly further comprises a connecting block, the connecting block is overall U-shaped, parallel two sections are provided with connecting holes matched with the third section of the limiting shaft.

[0026] Overall, the above technical scheme conceived by the utility model compared with the prior art can achieve the following beneficial effects:

[0027] (1) The utility model discloses a test tube rack, the bottom plate is placed on the experiment table surface, and meanwhile, two side plates extend upward to stably support the upper plate, thereby forming a firm frame structure, ensuring that the test tube rack is stably placed, so that shaking does not occur in the operation process due to external force or vibration. Secondly, by inserting the blood type card into the upper insertion hole and ensuring that the blood type card label area faces the opening formed by the side plate, the bottom plate and the upper plate, the blood type card reaction area and the label area can be conveniently observed during the sample adding process, greatly reducing the confusion caused by the line of sight obstruction. In addition, when processing multiple samples, the blood type card that has completed sample adding is transferred to the upper insertion hole away from the observation opening direction, and the blood type card to be added is always kept in the upper insertion hole near the opening, thereby reducing unnecessary movement and operation, further reducing the risk of sample confusion, improving the efficiency and accuracy of the experiment.

[0028] (2) The utility model discloses a test tube rack, which is stably arranged in the opening formed by the side plate, the bottom plate and the upper plate, and the blood type card label area faces the opening, so that the blood type card reaction area and the label area can be conveniently observed during the sample adding process, greatly reducing the confusion caused by the line of sight obstruction.

[0029] (3) The utility model discloses a test tube rack, which is stably arranged in the opening formed by the side plate, the bottom plate and the upper plate, and the blood type card label area faces the opening, so that the blood type card reaction area and the label area can be conveniently observed during the sample adding process, greatly reducing the confusion caused by the line of sight obstruction.

[0030] (4) The utility model discloses a test tube rack, which is stably arranged in the opening formed by the side plate, the bottom plate and the upper plate, and the blood type card label area faces the opening, so that the blood type card reaction area and the label area can be conveniently observed during the sample adding process, greatly reducing the confusion caused by the line of sight obstruction.

[0031] (5) The utility model discloses a test tube rack, which is stably arranged in the opening formed by the side plate, the bottom plate and the upper plate, and the blood type card label area faces the opening, so that the blood type card reaction area and the label area can be conveniently observed during the sample adding process, greatly reducing the confusion caused by the line of sight obstruction. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structure schematic view of the test tube rack of the utility model embodiment 1.

[0033] Figure 2 It is the structure schematic view of the test tube rack of the embodiment 2 of the utility model;

[0034] Figure 3 It is the structure schematic view of the test tube rack of the embodiment 3 of the utility model;

[0035] Figure 4 It is the structure schematic view of the sliding plate of the embodiment of the utility model;

[0036] Figure 5 It is the structure schematic view of the side slot of the embodiment of the utility model;

[0037] Figure 6 It is the structure schematic view of the test tube rack assembly of the embodiment of the utility model;

[0038] Figure 7 It is the side view of the test tube rack assembly of the embodiment of the utility model;

[0039] Figure 8 It is the sectional view of the limiting block of the embodiment of the utility model when limiting effect is carried out;

[0040] Figure 9 It is the structure schematic view of the connecting block of the embodiment of the utility model;

[0041] Figure 10 It is the structure schematic view of the test tube rack assembly connection of the embodiment of the utility model.

[0042] In all the drawings, same reference signs represent same technical features, specifically: 1-side plate, 11-through hole, 12-side slot, 2-bottom plate, 21-lower clamping groove, 22-sliding plate, 3-upper plate, 31-upper insertion hole, 4-expansion seat, 41-T-shaped slot, 5-limiting piece, 51-fixing seat, 52-limiting shaft, 53-baffle, 54-spring, 6-connecting block. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following is in combination with the drawings and embodiment, and the utility model is further detailed.The specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0044] Embodiment 1

[0045] As Figure 1As shown, Embodiment 1 of this utility model provides a blood type card test tube rack for convenient observation, including: side plates 1, a base plate 2, and an upper plate 3; two side plates 1 are symmetrically arranged on both sides of the upper end of the base plate 2; the upper plate 3 is located on the upper end of the two side plates 1, and has a plurality of upper insertion holes 31 evenly distributed perpendicular to the side plates 1; during use, by placing the base plate 2 on the experimental table, and with the two side plates 1 extending upward to stably support the upper plate 3, a sturdy frame structure is formed, ensuring that the test tube rack is placed stably, so that it will not shake due to external force or vibration during operation; secondly, through By inserting the blood type card into the upper insertion hole 31 and ensuring that the label area of ​​the blood type card faces the opening formed by the side plate 1, the bottom plate 2, and the upper plate 3, the reaction area and label area of ​​the blood type card can be easily observed during the sample addition process, greatly reducing the confusion that may be caused by obstruction of vision. In addition, when processing multiple samples, by moving the blood type card that has been added to the upper insertion hole 31 away from the observation opening, while the blood type card to be added is always kept in the upper insertion hole 31 near the opening, unnecessary movement and operation are reduced, further reducing the risk of sample confusion and improving the efficiency and accuracy of the experiment.

[0046] Preferably, the height from the contact surface between the base plate 2 and the blood type card to the upper surface of the upper plate 3 is less than the height of the blood type card but greater than the height of the reaction zone, in order to ensure convenient observation of the reaction zone and convenient sample addition.

[0047] Preferably, the length of the upper insertion hole 31 is adapted to the overall length of the blood type card, and the width of the upper insertion hole 31 is adapted to the width of the sample addition area or reaction area of ​​the blood type card, so as to ensure that the blood type card maintains a vertical state and ensures stable sample addition.

[0048] Preferably, the number of upper insertion holes 31 is at least two, in order to adapt to different usage requirements and avoid material waste.

[0049] Example 2

[0050] like Figure 2 As shown in Embodiment 1, in Embodiment 2, the upper surface of the base plate 2 is provided with a plurality of lower slots 21. The lower slots 21 correspond to the upper insertion holes 31 in position and the number of slots 21 is the same as the number of upper insertion holes 31. This is to ensure the stability of the blood type card during the experiment by cooperating with the lower slots 21 and the upper insertion holes 31 during use, thereby reducing the displacement or tipping of the blood type card due to improper operation or accidental contact, and effectively avoiding possible sample contamination and experimental errors.

[0051] Preferably, the width of the lower card slot 21 is adapted to the width of the lower end of the blood type card, and its length is not less than the length of the upper insertion hole 31, so as to improve the adaptability to different types of blood type cards and improve the operation convenience of the experimenters.

[0052] Other technical features are the same as those of Embodiment 1 and can achieve the same technical effects, which will not be repeated here.

[0053] Embodiment 3

[0054] As shown in the drawings, on the basis of Embodiment 2, the two side plates 1 in this embodiment 3 are uniformly provided with corresponding through holes 11, and the two test tube racks are connected through connecting pieces and a plurality of through holes 11 (not shown in the drawings), so as to adapt to the batch processing needs of multiple samples, while ensuring the stability of the connection, thereby avoiding the possible sample pollution during transfer. Figure 3 Preferably, the number of through holes 11 on the side plate 1 is at least four, so as to ensure the stability of the connection.

[0055] Preferably, the connecting piece includes a buckle assembly, a magnetic assembly, a bolt assembly or a bolt assembly, which is used to avoid interference with the observation of the blood group card label area and the reaction area while ensuring the stability of the connection.

[0056] Other technical features are the same as those of Embodiment 1 and can achieve the same technical effects, which will not be repeated here.

[0057] Embodiment 4

[0058] As shown in the drawings, on the basis of Embodiments 1 to 3, this embodiment 4 provides a blood group card test tube rack assembly convenient for observation, which includes the test tube rack as described above, and the bottom plate 2 is provided with a sliding plate 22 on both sides or the side plate 1 is provided with a side groove 12 on both sides; the test tube rack assembly further includes an expansion seat 4 and a limiting piece 5; the expansion seat 4 is rectangular as a whole, and is provided with a T-shaped groove 41 at the upper end; the limiting piece 5 is arranged at the upper end of the wing plate of the T-shaped groove 41. In the use process, a plurality of test tube racks are stably fixed in the T-shaped groove 41 through two limiting pieces 5 arranged at the upper end of the two wing plates of the T-shaped groove 41, so as to further conveniently combine the test tube racks, improve the processing capacity of the blood sample, and ensure the stability of the test tube rack assembly and avoid possible experimental errors.

[0059] Figure 4 to Figure 10 It should be noted that when the test tube racks are combined through the side grooves 12 on both sides of the side plate 1, the vertical distance from the expansion seat 4 to the upper surface of the bottom plate 2 should be not greater than one fifth of the blood group card label area, so as to avoid the possible problem of inconvenient observation.

[0060] It should be noted that when the test tube racks are combined through the side grooves 12 on both sides of the side plate 1, the vertical distance from the expansion seat 4 to the upper surface of the bottom plate 2 should be not greater than one fifth of the blood group card label area, so as to avoid the possible problem of inconvenient observation.

[0061] ​Particularly, when the T-shaped slot 41 is closed at one end, two wings of the T-shaped slot 41 are respectively provided with a limiting piece 5 at the upper end, which can ensure stable positioning of the test tube rack and reduce the complexity of the combination of multiple test tube racks.

[0062] Further, the limiting piece 5 comprises a fixed seat 51, a limiting shaft 52, a blocking piece 53 and a spring 54. The fixed seat 51 is hollow at the upper end of the wing of the T-shaped slot 41. The limiting shaft 52 is divided into three sections from the T-shaped slot 41 to the outside of the fixed seat 51. The first section is vertically arranged above the T-shaped slot 41. The third section passes through the fixed seat 51 and the wing of the T-shaped slot 41 to the inside of the T-shaped slot in sequence. The second section is connected to the upper end of the first section and the third section at both ends. The blocking piece 53 is arranged inside the fixed seat 51 and is sleeved outside the third section of the limiting shaft 52. The spring 54 is arranged inside the fixed seat 51 and is sleeved outside the third section of the limiting shaft 52. The spring 54 is connected to the upper surface of the blocking piece 53 and the upper surface inside the fixed seat 51 at both ends. Particularly, the length of the first section of the limiting shaft 52 arranged in the T-shaped slot 41 and the distance from the bottom surface of the blocking piece 53 to the bottom surface inside the fixed seat 51 are not less than the length of the third section of the limiting shaft 52 arranged in the T-shaped slot 41. During use, the first section and the third section of the limiting shaft 52 contact and limit the adjacent test tube rack. Then, the third section of the limiting shaft 52 is lifted to the inside of the wing of the T-shaped slot 41 by lifting the second section of the limiting shaft 52 upward. The limiting shaft 52 is rotated 60-110 degrees to the opening of the T-shaped slot 41 until the first section of the limiting shaft 52 contacts the fixed seat 51, so that the limiting piece 5 is disabled, thereby conveniently realizing the disassembly and assembly of multiple test tube racks, effectively reducing the operation difficulty and improving the experimental efficiency.

[0063] It can be understood that, in order to lift and rotate the third section of the limiting shaft 52 to the inside of the wing of the T-shaped slot 41, the limiting shaft 52 is lifted to the maximum height, i.e. the spring is in the limit compression state. The distance from the bottom surface of the blocking piece 53 to the bottom surface inside the fixed seat 51 is not less than the length of the third section of the limiting shaft 52 arranged in the T-shaped slot 41. In order to avoid the failure of the limiting seat 5, the distance from the bottom surface of the blocking piece 53 to the bottom surface inside the fixed seat 51 is less than the sum of the length of the third section of the limiting shaft 52 arranged in the T-shaped slot 41 and the height of the wing of the T-shaped slot 41, or the blocking piece 53 and the horizontal cross section inside the fixed seat 51 have the same shape.

[0064] In an optional embodiment, when the T-shaped slot 41 on the expansion seat 4 is open at both ends, the test tube rack assembly is provided with four limiters 5, respectively arranged at both ends of the wings of the T-shaped slot 41, at this time, the test tube rack assembly further comprises a connecting block 6, the connecting block 6 is U-shaped as a whole, and the parallel two segments are both provided with a connecting hole matched with the third segment of the limiting shaft 52; in the use process, the expansion seats 4 of the two test tube rack assemblies are adhered, by invalidating and inserting the two limiters 5 of the two test tube rack assemblies adjacent to each other into the connecting block 6, the two limiting shafts 52 are inserted into the connecting hole of the connecting block 6 at the same time, so that the two test tube rack assemblies are stably connected through the two connecting blocks, so as to adapt to the batch processing of more blood samples or the storage demand of a large number of blood type cards.

[0065] In summary, the working principle of the utility model is as follows: when the rapid detection of blood samples is carried out, the blood type card is inserted into the upper insertion hole 31 to the surface of the bottom plate 2, and the label area of the blood type card to be added is ensured to face the opening formed by the side plate 1, the bottom plate 2 and the upper plate 3, so as to facilitate real-time observation of the reaction area and the label area of the blood type card, and avoid sample addition errors; when a large number of blood samples need to be processed or a large number of blood type cards need to be stored, a plurality of test tube racks can be connected through the connecting piece and the through hole 11, or a plurality of test tube racks can be inserted into the test tube rack assembly, and the fixation of the plurality of test tube racks can be conveniently realized through the limiter 5, at the same time, the test tube rack assemblies can also be connected through the connecting block 6, further adapting to the experimental demand, and because the expansion seat 4 contacts the workbench surface in a large area, the stability of the spliced test tube rack can be ensured, and sample pollution or operation errors caused by shaking or tilting can be avoided.

[0066] It should be noted that if the utility model embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0067] In addition, if the utility model embodiments involve descriptions such as "first", "second" and the like, the descriptions of "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the utility model.

[0068] In this patent, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0069] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; those skilled in the art will readily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A blood group card test tube rack which is convenient to observe, characterized in that, The utility model relates to a test tube rack assembly, including: Two side plates (1) are symmetrically arranged on both sides of the upper end of the bottom plate (2), and the upper plate (3) is arranged on the upper end of the two side plates (1) and is uniformly distributed with a plurality of upper insertion holes (31) in the direction perpendicular to the side plates (1). The height from the contact surface of the blood type card to the upper surface of the upper plate (3) is less than the height of the blood type card and greater than the height of the reaction area.

2. The test tube rack of claim 1, wherein, The upper surface of the bottom plate (2) is provided with a plurality of lower clamping grooves (21), the positions of the lower clamping grooves (21) correspond to the positions of the upper insertion holes (31), and the number of the lower clamping grooves (21) is the same as the number of the upper insertion holes (31).

3. The test tube rack of claim 1, wherein, The two side plates (1) are uniformly provided with a plurality of corresponding through holes (11), and the two test tube racks are connected through a connecting piece and a plurality of through holes (11).

4. The test tube rack of claim 1, wherein, The number of the through holes (11) on the side plate (1) is at least four. The connecting piece includes a buckle assembly, a magnetic attraction assembly, a bolt assembly, or a bolt assembly. The test tube rack assembly further includes an expansion seat (4) and a limiting piece (5), the expansion seat (4) is rectangular as a whole, the upper end of the expansion seat (4) is provided with a T-shaped groove (41), and the limiting piece (5) is arranged on the upper end of the wing plate of the T-shaped groove (41).

5. A blood type card test tube rack assembly for easy observation, characterized by, The limiting piece (5) includes a fixed seat (51), a limiting shaft (52), a baffle (53), and a spring (54). The fixed seat (51) is hollow inside and arranged on the upper end of the wing plate of the T-shaped groove (41).

6. The test tube rack assembly of claim 5, wherein, The limiting shaft (52) is divided into three sections as a whole from the T-shaped groove (41) to the outside of the fixed seat (51), the first section is vertically arranged above the T-shaped groove (41), the third section passes through the fixed seat (51) and the wing plate of the T-shaped groove (41) to the inside of the T-shaped groove in sequence, and the second section is connected to the upper ends of the first section and the third section. The baffle (53) is arranged inside the fixed seat (51) and sleeved outside the third section of the limiting shaft (52). The spring (54) is arranged inside the fixed seat (51) and sleeved outside the third section of the limiting shaft (52), and the two ends of the spring (54) are connected to the upper surface of the baffle (53) and the upper surface inside the fixed seat (51), respectively. The length of the first section of the limiting shaft (52) arranged in the T-shaped groove (41) and the distance from the bottom surface of the baffle (53) to the bottom surface inside the fixed seat (51) are both greater than the length of the third section of the limiting shaft (52) arranged in the T-shaped groove (41). The distance from the bottom surface of the baffle (53) to the bottom surface inside the fixed seat (51) is less than the sum of the length of the third section of the limiting shaft (52) arranged in the T-shaped groove (41) and the height of the wing plate of the T-shaped groove (41). The baffle (53) and the horizontal cross section inside the fixed seat (51) have the same shape.

7. The test tube rack assembly of claim 6, wherein, When one end of the T-shaped groove (41) is closed, one limiting piece (5) is symmetrically arranged on the upper end of each wing plate of the two T-shaped grooves (41). ​ 8. The rack assembly of claim 6 or 7, wherein, ​ 9. The rack assembly of claim 6 or 7, wherein, When the T-shaped slot (41) is open at both ends, the test tube rack assembly is provided with four limiting members (5), and is respectively arranged at both ends of the wings of the two T-shaped slots (41).

10. The test tube rack assembly of claim 9, wherein, The test tube rack assembly further comprises a connecting block (6), which is U-shaped as a whole, and the parallel two sections are both provided with a connecting hole matched with the third section of the limiting shaft (52).

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