Liquid injection pump and sample adding system

Abstract

The utility model discloses a liquid injection pump and a sample adding system, which are applied to the field of sample adding equipment, and comprise a transmission part connected with a cavity part, and a plunger mounted at one end of the transmission part close to the cavity part; the driving assembly is connected with the transmission part, and the driving assembly can drive the transmission part to move in the direction close to or away from the cavity part; the driving part and the cavity part are installed at the two ends of the shell assembly respectively, and the transmission part is located in the shell assembly; and the at least two guide columns are installed on the shell assembly, guide holes allowing the guide columns to penetrate through are formed in the transmission component, and the guide columns correspond to the guide holes one to one and are in clearance fit with the guide holes. According to the liquid injection pump provided by the utility model, the clearance fit between the guide post and the guide hole is utilized, so that the double guidance of the transmission part is realized, the stability of the transmission part is improved, and the abrasion of a sealing ring between the plunger and the cavity part is reduced, thereby ensuring the stable operation of the liquid injection pump and prolonging the service life.

Description

Technical Field

[0001] The utility model relates to the field of sample adding equipment, in particular to a liquid injection pump and a sample adding system. Background Art

[0002] With the rise of the localization of the medical industry, the competition in in vitro diagnostic instruments is becoming increasingly fierce. The performance and long-term use stability of the sample adding system are important differentiators in the market competitiveness. The key component for the sample adding system is the power component - the precision liquid injection pump, namely the plunger pump. Therefore, it is crucial to ensure the sample adding accuracy of the plunger pump.

[0003] In related technologies, in order to ensure the sealing performance and long-term stability of the plunger pump, dynamic sealing is mostly adopted in the market. When the sealing structure of the plunger pump wears, the energy storage ring is used to automatically compensate the sealing structure, thereby extending the life of the plunger pump. However, the above method can only meet the situation of uniform circumferential wear of the sealing structure. Once the sealing structure is subjected to hard wear on one side due to some reason, the automatic compensation loses its function. In related technologies, in order to improve the coaxiality between the plunger and the sealing structure and reduce unilateral wear, the machining accuracy is also controlled to ensure the positioning between parts. However, the higher the accuracy requirement, the higher the cost, and the coaxiality error caused by the cumulative assembly error cannot be avoided.

[0004] Therefore, how to improve the transmission smoothness of the liquid injection pump is a technical problem that needs to be solved by those skilled in the art at present. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a liquid injection pump and a sample adding system, which can effectively improve the transmission smoothness of the liquid injection pump, reduce the wear of the sealing components, and improve the service life.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A liquid injection pump, comprising a cavity component and a plunger movably arranged on the cavity component, further comprising:

[0008] A transmission component, connected to the cavity component, and the plunger is installed at one end of the transmission component close to the cavity component;

[0009] A driving assembly, connected to the transmission component, and the driving assembly can drive the transmission component to move towards or away from the cavity component;

[0010] A housing assembly, the driving component and the cavity component are respectively installed at both ends of the housing assembly, and the transmission component is located inside the housing assembly;

[0011] At least two guide posts are installed on the housing assembly, and guide holes for the guide posts to penetrate are provided on the transmission component. The guide posts correspond to the guide holes one by one and are in clearance fit.

[0012] On the other hand, the transmission component includes a transmission main body and a connecting step. The connecting step is located on one side of the circumference of the transmission main body close to the driving component. There is a gap between the transmission main body and the housing assembly. The guide holes are provided on the connecting step. The plunger is installed on the transmission main body, and the guide posts are symmetrically distributed relative to the transmission main body.

[0013] On the other hand, the driving component includes a power component and a driving shaft. The driving shaft is installed on the power component, and the driving shaft extends into the housing assembly and is threadedly connected to the transmission main body.

[0014] On the other hand, an external thread is provided on the driving shaft, a blind hole is provided on one side of the transmission main body close to the connecting step, an internal thread is provided on the inner wall of the blind hole, and the external thread is adapted to the internal thread; and the depth of the blind hole is greater than the target stroke of the transmission component.

[0015] On the other hand, the housing assembly includes a housing body and a guide block. One end of the housing body is connected to the cavity component, and the other end is connected to the guide block. The transmission component and the guide posts are both located inside the housing body; the guide posts are installed on the guide block, and one side of the guide block facing away from the housing body is connected to the driving component.

[0016] On the other hand, a number of assembly holes are provided on one side of the guide block close to the transmission component. The guide posts correspond to the assembly holes one by one and are in interference fit; or the guide block and the guide posts are of an integrally formed structure.

[0017] On the other hand, a first step portion and a second step portion are respectively provided on both sides of the guide block. The first step portion is in mating connection with the housing body, and the second step portion is in mating connection with the driving component.

[0018] On the other hand, it further includes an identification component and a sensor for detecting the moving position of the transmission component. The sensor can acquire the position of the identification component; the identification component is installed at one end of the transmission component close to the guide hole and can move with the transmission component, and the sensor is installed on the guide post; when the transmission component moves to the origin position, the positions of the sensor and the identification component correspond.

[0019] On the other hand, it further includes an identification component and a sensor for detecting the moving position of the transmission component, and the sensor can acquire the position of the identification component; the identification component is installed at one end of the transmission component facing away from the drive assembly and can move along with the transmission component, the sensor is installed on the side wall of the housing assembly, and an avoidance groove for avoiding the sensor is further provided on the side wall of the transmission component; when the transmission component moves to the origin position, the positions of the sensor and the identification component correspond. The present invention also provides a sample adding system, including the liquid injection pump described in any one of the above.

[0020] In the liquid injection pump provided by the present invention, through the arrangement of the transmission component, the plunger is installed on the transmission component, and when the transmission component moves, it drives the plunger to move, so as to realize the reciprocating movement of the plunger relative to the cavity component; a chamber capable of storing liquid is provided inside the cavity component, and the plunger can reciprocate towards the cavity component, so as to complete the extraction and injection of the liquid. A sealing ring is provided between the plunger and the cavity component to prevent the liquid from flowing out of the chamber along the plunger; through the arrangement of the drive assembly, the drive assembly can drive the transmission component to move towards or away from the cavity component, that is, the drive assembly can drive the transmission component to reciprocate along the extension direction of the plunger. The drive assembly can be in the form of a motor and a drive shaft, or in the form of a telescopic cylinder, and any drive mode capable of driving the transmission component to move can be used; by setting the housing assembly and arranging the transmission component inside the housing assembly, the stability and service life of the transmission component can be improved, and it is beneficial to the arrangement of the guide posts; the number of the guide posts is at least two. The guide posts are installed on the housing assembly, and then by providing the guide holes on the transmission component and using the clearance fit between the guide posts and the guide holes, double guidance of the transmission component is realized, the stability of the transmission component is improved, and the wear of the sealing ring between the plunger and the cavity component is reduced, so as to ensure the smooth operation of the liquid injection pump and improve the service life.

[0021] The sample adding system provided by the present invention is provided with the above-mentioned liquid injection pump. Since the liquid injection pump has the above technical effects, the sample adding system provided with this liquid injection pump should also have corresponding technical effects. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 The sectional view of the first specific embodiment of the liquid injection pump provided by the present utility model;

[0024] Figure 2 is Figure 1 the sectional view of the liquid injection pump shown from another perspective;

[0025] Figure 3 The structural schematic diagram of the second specific embodiment of the liquid injection pump provided by the present utility model;

[0026] Figure 4 is Figure 3 the sectional view of the liquid injection pump shown from another perspective.

[0027] Reference numerals:

[0028] Cavity component 01; plunger 02; sealing structure 03; transmission component 10; transmission main body 11; connection step 12; drive assembly 20; power component 21; drive shaft 22; housing assembly 30; housing body 31; guide block 32; first step portion 321; second step portion 322; guide post 40; identification component 50; sensor 60. Specific embodiments

[0029] The core of the present utility model is to provide a liquid injection pump and a sample addition system, which can increase the service life and stability.

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0031] In this embodiment, please refer to Figure 1 , the liquid injection pump includes a cavity component 01 and a plunger 02 movably arranged on the cavity component 01, and further includes:

[0032] A transmission component 10, connected to the cavity component 01, and the plunger 02 is installed at one end of the transmission component 10 close to the cavity component 01;

[0033] A drive assembly 20, connected to the transmission component 10, and the drive assembly 20 can drive the transmission component 10 to move in a direction close to or away from the cavity component 01;

[0034] A housing assembly 30, the drive component and the cavity component 01 are respectively installed at both ends of the housing assembly 30, and the transmission component 10 is located inside the housing assembly 30;

[0035] At least two guide posts 40 are installed on the housing assembly 30, and the transmission member 10 is provided with guide holes through which the guide posts 40 penetrate. The guide posts 40 correspond to the guide holes one by one and are in clearance fit.

[0036] Specifically, the cavity structure is provided with a groove, and a sealing structure 03 for ensuring sealing, such as an O-ring, is placed in the groove. The plunger 02 passes through the sealing structure 03 to form a closed cavity together with the cavity; the plunger 02 is fixed on the transmission member 10 and is driven by the transmission member 10 to realize the reciprocating movement of the plunger 02; the guide post 40 can be a cylinder, which is convenient for assembly and has little wear. Of course, it can also be a square post or a column of other shapes. The diameter of the guide hole should be slightly larger than the diameter of the guide post 40. The gap between the guide hole and the guide post 40 should not be too large, otherwise the guiding accuracy will be poor, nor should it be too small, otherwise the movement of the transmission member 10 will be affected.

[0037] Through the arrangement of the transmission member 10, the plunger 02 is installed on the transmission member 10. When the transmission member 10 moves, it drives the plunger 02 to move, thereby realizing the reciprocating movement of the plunger 02 relative to the cavity member 01; the cavity member 01 is internally provided with a chamber for storing liquid, and the plunger 02 can reciprocate towards the cavity member 01, thereby completing the extraction and injection of the liquid. A sealing ring is provided between the plunger 02 and the cavity member 01 to prevent the liquid from flowing out of the chamber along the plunger 02; through the arrangement of the driving assembly 20, the driving assembly 20 can drive the transmission member 10 to move towards or away from the cavity member 01, that is, the driving assembly 20 can drive the transmission member 10 to reciprocate along the extension direction of the plunger 02. The driving assembly 20 can be in the form of a motor and a driving shaft 22, or in the form of a telescopic cylinder. Any driving method that can drive the transmission member 10 to move is acceptable; by arranging the housing assembly 30 and setting the transmission member 10 inside the housing assembly 30, the stability and service life of the transmission member 10 can be improved, and it is also beneficial to the arrangement of the guide posts 40; the number of guide posts 40 is at least two. The guide posts 40 are installed on the housing assembly 30, and then by setting guide holes on the transmission member 10 and using the clearance fit between the guide posts 40 and the guide holes, double guiding of the transmission member 10 is realized, the stability of the transmission member 10 is improved, and the wear of the sealing ring between the plunger 02 and the cavity member 01 is reduced, thereby ensuring the smooth operation of the liquid injection pump and improving the service life.

[0038] In some embodiments, the transmission component 10 includes a transmission main body 11 and a connecting step 12. The connecting step 12 is located on the circumferential portion of the transmission main body 11 on the side close to the driving component 20. There is a gap between the transmission main body 11 and the housing component 30. The guiding holes are arranged on the connecting step 12. The plunger 02 is installed on the transmission main body 11, and the guiding columns 40 are symmetrically distributed relative to the transmission main body 11. Specifically, the connecting step 12 should have a certain thickness so that the depth of the guiding holes is sufficient and the guiding and limiting effect is good; there is a gap between the periphery of the connecting step 12 and the inner wall of the housing component 30 to facilitate the reciprocating movement of the transmission component 10 inside the housing component 30; the extending direction of the connecting step 12 is perpendicular to the extending direction of the transmission main body 11 to facilitate the opening of the guiding holes. The plunger 02 is installed at one end of the transmission main body 11 away from the connecting step 12. By installing the plunger 02 at one end of the transmission main body 11 and setting a connecting edge at the other end, the internal space of the housing component 30 can be fully utilized; at the same time, the guiding columns 40 are symmetrically distributed relative to the transmission main body 11, which can ensure the stable guiding of the guiding columns 40 to the transmission component 10, reduce shaking, and thus reduce the wear of the sealing structure 03.

[0039] In some embodiments, the driving component 20 includes a power component 21 and a driving shaft 22. The driving shaft 22 is installed on the power component 21, and the driving shaft 22 extends into the housing component 30 and is threadedly connected to the transmission main body 11; specifically, the power component 21 can be a motor, such as a linear stepper motor, with high control precision. Through the setting of the driving shaft 22, using the threaded connection between the driving shaft 22 and the transmission main body 11, the rotation of the driving shaft 22 is converted into the lifting of the transmission main body 11; during the process of converting the rotational motion into a linear motion under the action of the driving component 20, the transmission component 10 does not yaw or shake and is stably transmitted to the plunger 02, achieving the purpose of improving the coaxiality of the driving component 20, the transmission component 10, the plunger 02, and the sealing structure 03, and fundamentally improving the precision and service life of the plunger 02 pump.

[0040] In some embodiments, the driving shaft 22 is provided with an external thread, and the transmission main body 11 is provided with a blind hole on the side close to the connecting step 12. The inner wall of the blind hole is provided with an internal thread, and the external thread is adapted to the internal thread to ensure the effective cooperation between the driving shaft 22 and the transmission main body 11. Further, the depth of the blind hole is greater than the target stroke of the transmission component 10, which can avoid interference between the transmission main body 11 and the driving shaft 22 and ensure that the driving shaft 22 does not touch the bottom surface of the blind hole during the lifting process of the transmission component 10.

[0041] In some embodiments, the housing assembly 30 includes a housing body 31 and a guide block 32. One end of the housing body 31 is connected to the cavity component 01, and the other end is connected to the guide block 32. The transmission component 10 and the guide post 40 are both located inside the housing body 31. The guide post 40 is installed on the guide block 32, and the side of the guide block 32 facing away from the housing body 31 is connected to the drive assembly 20. Specifically, by separating the housing assembly 30 into the housing body 31 and the guide block 32, the housing body 31 is cylindrical. Before assembling the housing body 31 and the guide block 32, the guide post 40 is first installed on the guide block 32, then the transmission component 10 is placed inside the housing body 31, and then the housing body 31 and the guide block 32 are assembled, which is convenient for operation.

[0042] In some embodiments, several assembly holes are provided on the side of the guide block 32 close to the transmission component 10. The guide posts 40 correspond to the assembly holes one by one and are in interference fit, which is convenient for connection and has high connection strength. Or, the guide block 32 and the guide posts 40 are of an integrally formed structure, which is convenient for processing and the guide posts 40 are not easily detached. Of course, the guide posts 40 can also be fixed on the guide block 32 by welding or threaded connection.

[0043] In some embodiments, a first stepped portion 321 and a second stepped portion 322 are respectively provided on both sides of the guide block 32. The first stepped portion 321 is engaged with the housing body 31, and the second stepped portion 322 is engaged with the drive assembly 20. Through the settings of the first stepped portion 321 and the second stepped portion 322, the coaxiality of the guide block 32 with the housing body 31 and the drive assembly 20 can be further improved, and it is convenient for positioning during assembly and the disassembly and assembly efficiency is high.

[0044] In some embodiments, such as Figure 1 and Figure 2As shown, it further includes an identification component 50 and a sensor 60 for detecting the moving position of the transmission component 10. The sensor 60 can obtain the position of the identification component 50. The identification component 50 is installed at one end of the transmission component 10 close to the guiding hole and can move with the transmission component 10. The sensor 60 is installed on the guiding column 40. When the transmission component 10 moves to the origin position, the positions of the sensor 60 and the identification component 50 correspond. Specifically, the identification component 50 is installed on the transmission component 10, and the sensor 60 is installed on the guiding column 40. Only a wire passing hole needs to be opened on the housing body 31 of the housing assembly 30. The sensor 60 can be installed on one of the guiding columns 40, or sensors 60 can be provided on multiple guiding columns 40. By setting multiple identification components 50, the accuracy of position detection is improved, and a backup is provided to prevent damage to the equipment due to the inability of a certain sensor 60 to work and the transmission component 10 being unable to stop in time. In the above manner, by arranging both the identification component 50 and the sensor 60 inside the housing assembly 30, when the transmission component 10 moves linearly on the guiding column 40, the plunger 02 moves to the origin position, prompting the sensor 60 on the guiding column 40 to trigger a signal. After the transmission component 10 moves reversely by a target distance and then reverses again, when the sensor 60 acquires the identification component 50 again, the origin position is determined again, and then the transmission component 10 moves reversely by the target distance again, thereby realizing the reciprocating movement of the plunger 02. And corresponding holes are opened on the housing body 31 so that the cable of the sensor 60 can be led out of the housing body 31. This method can further reduce the volume of the liquid injection pump, enabling it to be applied in a more confined space and expanding the scope of use.

[0045] In some embodiments, such as Figure 3 and Figure 4As shown in the figure, it further includes an identification component 50 and a sensor 60 for detecting the moving position of the transmission component 10. The sensor 60 can obtain the position of the identification component 50. The identification component 50 is installed at one end of the transmission component 10 facing away from the drive assembly 20 and can move with the transmission component 10. The sensor 60 is installed on the side wall of the housing assembly 30. An avoidance groove for avoiding the sensor 60 is also provided on the side wall of the transmission component 10. When the transmission component 10 moves to the origin position, the positions of the sensor 60 and the identification component 50 correspond. Specifically, an installation groove is provided on the side wall of the housing assembly 30, and the sensor 60 is arranged in the installation groove. By identifying the identification component 50 through the sensor 60, it is used as the basis for setting the origin position. Then, after the transmission component 10 moves a target distance and moves in the reverse direction, the origin position is confirmed by identifying the identification component 50 through the sensor 60, which can meet the position accuracy of the plunger 02, can set the target distance as needed, and improve the applicable range. By installing the sensor 60 on the side wall of the housing assembly 30, the position stability of the sensor 60 can be ensured. An avoidance groove for avoiding the sensor 60 is also provided on the side wall of the transmission component 10. While the volume of the liquid injection pump is small, the position of the sensor 60 can be avoided, reducing damage to the sensor 60. Further, the identification component 50 can be a magnet, which is convenient for obtaining materials and detection.

[0046] Specifically, in a specific embodiment, when the liquid injection pump is in use, the control module powers on the drive assembly 20 and issues an instruction, and the drive assembly 20 starts to perform a rotational motion. The motor cooperates with the drive shaft 22 to convert the rotational motion into a linear motion and simultaneously drives the plunger 02 to move in the cavity. When the plunger 02 moves to the origin position, it prompts the sensor 60 to trigger a signal, causing the plunger 02 to perform a reciprocating motion. Combined with the liquid path system, when the plunger 02 moves downward, the liquid enters the sealed cavity. When the plunger 02 moves upward, the liquid is discharged, thereby realizing the aspiration and injection of the sample.

[0047] For this liquid injection pump, a guiding hole is provided on the motor, and the guiding block 32 is positioned by the boss of the power component 21 in the drive assembly 20 to ensure the coaxiality of the guiding block 32 and the power component 21. And through the fixing hole extending radially along the guiding block 32, it is locked to the power component 21. At least two guiding columns 40 are vertically fixed to the guiding block 32, that is, first ensure the coaxiality of the guiding columns 40, the guiding block 32, and the motor.

[0048] As is well known, there are radial clearances and axial clearances between a linear stepper motor and a motor nut. During the operation of the motor, these clearances will cause the nut to swing left and right. At the same time, for the drive shaft 22, near the root of the motor, the operation is smoother and the coaxiality is better; away from the root of the motor, the swing is greater and the coaxiality is worse. Therefore, in addition to the coaxiality errors caused by the above-mentioned machining accuracy and assembly, the coaxiality errors caused by the motor drive shaft 22 and the nut cannot be ignored. To reduce the coaxiality errors caused by this part, it should be guided and constrained throughout the process to make it travel within a given "track". This liquid injection pump precisely cooperates with a guide column 40 fixed on a guide block 32 by providing a guide hole on the motor. The motor runs in a given direction, the swing of the transmission mechanism is constrained, and at the same time, it is ensured that the motor remains coaxial with the motor when approaching and away from the motor. It is known that the plunger 02 is fixed on the motor. Similarly, the housing assembly 30 is fixed on the motor, and the cavity assembly, including the sealing structure 03, is fixed on the housing assembly 30. Ensuring the coaxiality of the motor with the motor also ensures the coaxiality of the plunger 02 with the sealing structure 03. In this way, when the plunger 02 reciprocates in the cavity, rubbing against the sealing structure 03, the problem of unilateral hard wear is avoided, and thus the accuracy and long-term use stability of the plunger 02 pump are ensured.

[0049] In addition to the above-mentioned liquid injection pump, the present utility model also provides a sampling system including the above-mentioned liquid injection pump. For the structures of other parts of this sampling system, reference can be made to the prior art and will not be elaborated herein.

[0050] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0051] The above has introduced the liquid injection pump provided by the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. A liquid injection pump, comprising a cavity component (01) and a plunger (02) movably arranged on the cavity component (01), characterized in that: Also includes: A transmission component (10) connected to the cavity component (01), and the plunger (02) is mounted on an end of the transmission component (10) close to the cavity component (01); A driving component (20) connected to the transmission component (10), wherein the driving component (20) is capable of driving the transmission component (10) to move in a direction approaching or moving away from the cavity component (01); A housing component (30), wherein the driving component and the cavity component (01) are respectively mounted at two ends of the housing component (30), and the transmission component (10) is located inside the housing component (30); At least two guide posts (40) are mounted on the housing assembly (30), and the transmission component (10) is provided with guide holes for the guide posts (40) to pass through, and the guide posts (40) correspond to the guide holes one by one and are clearance-matched.

2. The infusion pump according to claim 1, characterized in that: The transmission component (10) comprises a transmission body (11) and a connecting step (12); the connecting step (12) is located on a side of the periphery of the transmission body (11) close to the drive assembly (20); a gap is provided between the transmission body (11) and the housing assembly (30); the guide hole is provided on the connecting step (12); the plunger (02) is mounted on the transmission body (11); and the guide columns (40) are symmetrically distributed relative to the transmission body (11).

3. The infusion pump according to claim 2, characterized in that: The drive assembly (20) comprises a power component (21) and a drive shaft (22), wherein the drive shaft (22) is mounted on the power component (21), and the drive shaft (22) extends into the interior of the housing assembly (30) and is threadedly connected to the transmission body (11).

4. The infusion pump according to claim 3, characterized in that: The drive shaft (22) is provided with an external thread, the transmission body (11) is provided with a blind hole on one side close to the connection step (12), the inner wall of the blind hole is provided with an internal thread, the external thread is adapted to fit the internal thread; and the depth of the blind hole is greater than the target stroke of the transmission component (10).

5. The infusion pump according to claim 1, characterized in that: The shell assembly (30) comprises a shell body (31) and a guide block (32); one end of the shell body (31) is connected to the cavity component (01), and the other end is connected to the guide block (32); the transmission component (10) and the guide column (40) are both located inside the shell body (31); the guide column (40) is mounted on the guide block (32); and the side of the guide block (32) facing away from the shell body (31) is connected to the drive assembly (20).

6. The infusion pump according to claim 5, characterized in that: A plurality of assembly holes are provided on a side of the guide block (32) close to the transmission component (10), and the guide posts (40) correspond to the assembly holes one by one and are interference fit; or the guide block (32) and the guide posts (40) are an integrally formed structure.

7. The infusion pump according to claim 5, characterized in that: A first step portion (321) and a second step portion (322) are respectively provided on both sides of the guide block (32); the first step portion (321) is engaged with the housing body (31) in a matching and snap-fitting manner, and the second step portion (322) is engaged with the drive assembly (20) in a matching and snap-fitting manner.

8. The infusion pump according to any one of claims 1 to 7, characterized in that: It also comprises an identification component (50) and a sensor (60) for detecting the moving position of the transmission component (10), wherein the sensor (60) is capable of acquiring the position of the identification component (50); the identification component (50) is mounted on one end of the transmission component (10) close to the guide hole and can move with the transmission component (10), and the sensor (60) is mounted on the guide column (40); when the transmission component (10) moves to the origin position, the sensor (60) corresponds to the position of the identification component (50).

9. The infusion pump according to any one of claims 1 to 7, characterized in that: The invention also comprises an identification component (50) and a sensor (60) for detecting the moving position of the transmission component (10), wherein the sensor (60) is capable of acquiring the position of the identification component (50); the identification component (50) is mounted on an end of the transmission component (10) away from the drive component (20) and can move with the transmission component (10); the sensor (60) is mounted on a side wall of the housing component (30); the side wall of the transmission component (10) is further provided with an avoidance groove for avoiding the sensor (60); when the transmission component (10) moves to the origin position, the position of the sensor (60) corresponds to that of the identification component (50).

10. A sample adding system, comprising a liquid injection pump, characterized in that: The infusion pump is the infusion pump according to any one of claims 1 to 9.

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