CN219641732U - Novel sample injection device - Google Patents

Abstract

The utility model relates to the technical field of analytical detection instrument accessories, in particular to a novel sample injection device which comprises a frame, a supporting beam, a mounting seat, a sampling assembly, a sample rack, an X-direction driving mechanism and a Z-direction driving mechanism. According to the utility model, the flexible assembly is arranged between the X-direction driving mechanism and the Z-direction driving mechanism, so that the relative parallelism among the mounting seat, the lead screw and the spline shaft can be maintained, the sampling assembly, the rack and the mounting seat can be adaptively adjusted in the action process, the running is stable and reliable, the precision requirement is reduced, the abrasion and even the blocking caused by poor parallelism are avoided, and the service life of the device is prolonged; the supporting spring is arranged to compensate directional deviation in multiple directions, so that stress in all directions is relatively uniform, the problem that adjustment is limited due to the nature of the rigid piece is solved, the running stability and consistency of equipment are improved, and high requirements on assembly difficulty and assembly precision are reduced.

Description

Novel sample injection device

Technical Field

The utility model relates to the technical field of detection instrument accessories, in particular to a novel sample injection device.

Background

The chemical analysis detection technology is widely applied to the fields of food sanitation and safety, environmental monitoring, medicine and health and the like, and the sampling device is taken as an important component in an analysis instrument and is usually used for taking out a sample from a sample bottle and sending the sample into detection equipment for sample detection and analysis in cooperation with subsequent liquid pumping equipment. At present, when most sampling devices sample a plurality of samples, the sampling assembly can only realize up-and-down reciprocating movement so as to realize the suction of the samples, and the use is inconvenient; the sampling assembly has higher assembly precision due to the relative movement among multiple parts in the movement process, and has high assembly work difficulty, otherwise, the assembly precision is low, and adverse phenomena such as interference, abrasion, even jamming and the like are easy to occur, so that the normal use and the service life of the sampling assembly are influenced.

Disclosure of Invention

The utility model aims to provide a novel sample injection device so as to solve the problems in the prior art in the background art.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the novel sample injection device comprises a frame, a supporting beam, a mounting seat, a sampling assembly, a sample rack, an X-direction driving mechanism and a Z-direction driving mechanism; the device comprises a frame, a sampling assembly, a Z-direction driving mechanism, a support beam, a mounting seat, an X-direction driving mechanism, a Z-direction driving mechanism, a spring shifting sleeve, a Z-direction driving mechanism and a sampling assembly, wherein the support beam is fixedly arranged on the frame, the mounting seat is in sliding connection with the support beam through the X-direction driving mechanism, the sampling assembly is arranged on the mounting seat in a sliding manner and is driven to slide by the Z-direction driving mechanism, a flexible assembly for compensating parallelism is arranged between the X-direction driving mechanism and the Z-direction driving mechanism, the flexible assembly comprises the spring shifting sleeve and the spring shifting sleeve, the spring shifting sleeve is arranged on the X-direction driving mechanism, one end of the spring shifting sleeve is fixedly arranged on the mounting seat, the other end of the spring shifting sleeve is fixedly connected with the spring shifting sleeve, and the other end of the spring shifting sleeve is fixedly arranged on the Z-direction driving mechanism; the sample rack is arranged on the rack and used for placing sample bottles.

On the basis of the technical scheme, the X-direction driving mechanism comprises a first motor, a belt transmission mechanism and a screw rod, wherein the first motor is fixedly arranged on the supporting beam, the first motor drives the screw rod to rotate through the belt transmission mechanism, and the mounting seat is sleeved on the screw rod and is in sliding connection with the screw rod.

On the basis of the technical scheme, the Z-direction driving mechanism comprises a second motor, a belt transmission mechanism, a spline shaft, a gear and a rack, wherein the second motor is fixedly arranged on a supporting beam, the second motor drives the spline shaft to rotate through the belt transmission mechanism, the gear sleeve is arranged on the spline shaft and is driven to rotate by the spline shaft, the rack is fixedly arranged on the sampling assembly, and the rack and the gear are meshed to drive the Z-direction of the sampling assembly to move.

On the basis of the technical scheme, a first sliding block is fixedly arranged on the rack, the sampling assembly is fixedly arranged on the first sliding block, a guide rail is arranged on the mounting seat, and the first sliding block is matched with the guide rail and is in sliding connection with the guide rail; the spring shifting sleeve is sleeved on the screw rod, one end of the spring shifting sleeve is fixedly arranged on the mounting seat, the other end of the spring shifting sleeve is fixedly connected with the supporting spring, and the other end of the supporting spring is fixedly arranged on the outer side wall of the guide rail.

On the basis of the technical scheme, the inner side wall of the gear is symmetrically provided with the accommodating grooves, the outer side wall of the spline shaft is correspondingly provided with the key grooves, the accommodating grooves and the key grooves are buckled to form accommodating spaces, and the balls are arranged in the accommodating spaces.

On the basis of the technical scheme, an anti-backlash nut is arranged between the screw rod and the mounting seat, the anti-backlash nut is sleeved on the screw rod, and the spring shifting sleeve is fixedly sleeved on the outer side wall of the anti-backlash nut.

On the basis of the technical scheme, the sample frame is in sliding connection with the frame through the Y-direction driving mechanism, the Y-direction driving mechanism comprises a third motor, a belt transmission mechanism and a transmission block, the third motor is fixedly arranged on the frame, the third motor drives the belt transmission mechanism to rotate, the transmission block is fixedly arranged on a belt in the belt transmission mechanism, and the sample frame is fixedly arranged on the transmission block and is in sliding connection with the frame.

On the basis of the technical scheme, the sampling assembly comprises a shell, a needle seat, a buffer spring and an inner needle, wherein the shell is fixedly arranged on the rack, the needle seat is slidably arranged inside the shell, the buffer spring is sleeved on the needle seat, one end of the buffer spring is abutted to the top end inside the shell, the other end of the buffer spring is fixedly arranged on the needle seat, one end of the inner needle is fixedly arranged on the needle seat, and the other end of the inner needle extends to the outside of the shell.

On the basis of the technical scheme, the sampling assembly further comprises an outer needle, the outer needle is fixedly arranged at the bottom end of the shell and is communicated with the inside of the shell, the outer needle is sleeved on the outer side of the inner needle, and the inner needle is in sliding connection with the outer needle.

On the basis of the technical scheme, the injection pump assembly for taking out samples is further included, the injection pump assembly comprises a valve head, an injection pump pipe, a push rod and a belt transmission mechanism, a plurality of valve ports are arranged on the valve head, an inner needle is communicated with the valve ports, a rotary piece is arranged on one side of the valve head and is driven to rotate by a motor, a liquid channel is arranged on the rotary piece to realize communication between two different valve ports, the injection pump pipe is communicated with the valve ports, one end of the push rod is slidably arranged inside the injection pump pipe, the other end of the push rod is fixedly arranged on a second sliding block, and the second sliding block is driven to move by the belt transmission mechanism.

The technical scheme provided by the utility model has the beneficial effects that:

according to the utility model, the flexible component is arranged between the X-direction driving mechanism and the Z-direction driving mechanism, namely the spring shifting sleeve and the abutting spring are arranged, the relative parallelism among the mounting seat, the lead screw and the spline shaft can be kept by utilizing the flexible characteristic of the flexible component in the X-direction and Z-direction of the sampling component in the moving process, the sampling component, the rack and the mounting seat can be subjected to self-adaptive adjustment of micro parallelism in the moving process, the operation is stable and reliable, the precision requirement is reduced, the abrasion and even the blocking phenomenon caused by poor parallelism is avoided, and the service life is prolonged; the spring is supported to compensate the directional deviation that the multi-direction appears through being provided with, makes the atress in each direction even relatively, improves in the past because the rigidity piece itself nature brings the limited problem of regulation, increases stability and the uniformity of equipment operation, reduces the high requirement of assembly degree of difficulty and assembly precision, and equipment and use are more convenient.

Drawings

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic perspective view of the utility model with the sample holder and syringe pump assembly removed;

FIG. 3 is a schematic perspective view of another angle of FIG. 2;

FIG. 4 is a schematic view of the structure of the X-direction driving mechanism and the Z-direction driving mechanism in the present utility model;

FIG. 5 is an exploded view of the structure of FIG. 4;

FIG. 6 is a schematic view of the internal structure of the gear and spline shaft of the present utility model;

FIG. 7 is a schematic view of the structure of the gear of the present utility model;

FIG. 8 is a schematic diagram of a sampling assembly according to the present utility model;

FIG. 9 is a schematic diagram of the internal structure of the sampling assembly of the present utility model;

FIG. 10 is a schematic view of the structure of the syringe pump assembly of the present utility model;

Detailed Description

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

in the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be understood that the terms "left", "right", "front", "rear", "top", "bottom", and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

As shown in fig. 1 to 10, a novel sample injection device comprises a frame 1, a supporting beam 2, a mounting seat 3, a sampling assembly 4, a sample frame 5, an X-direction driving mechanism 6 and a Z-direction driving mechanism 7; the support beam 2 is fixedly arranged on the frame 1, the mounting seat 3 is in sliding connection with the support beam 2 through the X-direction driving mechanism 6, the sampling assembly 4 is arranged on the mounting seat 3 in a sliding manner and is driven to slide by the Z-direction driving mechanism 7, a flexible assembly for compensating parallelism is arranged between the X-direction driving mechanism 6 and the Z-direction driving mechanism 7, the flexible assembly comprises a spring poking sleeve 10 and a supporting spring 11, the spring poking sleeve 10 is sleeved on the X-direction driving mechanism 6, one end of the spring poking sleeve is fixedly arranged on the mounting seat 3, the other end of the spring poking sleeve is fixedly connected with the supporting spring 11, and the other end of the supporting spring 11 is fixedly arranged on the Z-direction driving mechanism 7; the sample rack 5 is arranged on the frame 1 and is used for placing sample bottles.

According to the utility model, the X-direction driving mechanism 6 and the Z-direction driving mechanism 7 are respectively arranged to work in a matched manner, so that the movement of the sampling assembly in the transverse direction, namely the X direction, and the movement in the vertical direction, namely the Z direction, are realized, the sampling assembly is convenient to absorb samples in a plurality of sample bottles at different positions and realize automatic sample injection into corresponding detection instruments, the use is more convenient, the automation degree is high, the working efficiency is improved, and adverse effects such as pollution to the samples caused by excessive manual intervention are avoided. The flexible components are arranged between the X-direction driving mechanism 6 and the Z-direction driving mechanism 7, namely the spring shifting sleeve 10 and the supporting spring 11 are arranged, the relative parallelism among the mounting seat 3, the lead screw 62 and the spline shaft 72 and between the sampling component 4, the rack 74 and the mounting seat 3 can be maintained by utilizing the flexible characteristics of the flexible components in the X-direction and Z-direction of the sampling component 4 and in the movement process, the self-adaptive adjustment of micro parallelism is realized in the movement process, the operation is stable and reliable, the precision requirement is reduced, the abrasion and even the blocking caused by poor parallelism are avoided, and the service life is prolonged; the supporting spring 11 is arranged to compensate directional deviation in multiple directions, so that stress in all directions is relatively uniform, the problem that the adjustment is limited due to the nature of the rigid part is solved, the running stability and consistency of equipment are improved, the high requirements on assembly difficulty and assembly precision are reduced, and the assembly and use are more convenient.

On the basis of the technical scheme, the X-direction driving mechanism 6 comprises a first motor 61, a belt transmission mechanism and a screw rod 62, wherein the first motor 61 is fixedly arranged on the supporting beam 2, the first motor 61 drives the screw rod 62 to rotate through the belt transmission mechanism, and the mounting seat 3 is sleeved on the screw rod 62 and is in sliding connection with the screw rod 62.

By arranging the X-direction driving mechanism 6, the first motor 61 drives the screw rod 62 to rotate on the supporting beam 2 through the belt transmission mechanism, so that the mounting seat 3 with the sampling assembly 4 can be driven to move left and right on the supporting beam 2, namely, move transversely in the X direction; meanwhile, the mounting seat 3 is in sliding connection with the spline shaft 72 in the Z-direction driving mechanism 7, the spline shaft 72 can play a role in guiding in the movement process of the mounting seat 3, and the operation process is more stable.

On the basis of the technical scheme, the Z-direction driving mechanism 7 comprises a second motor 71, a belt transmission mechanism, a spline shaft 72, a gear 73 and a rack 74, wherein the second motor 71 is fixedly arranged on the supporting beam 2, the second motor 71 drives the spline shaft 72 to rotate through the belt transmission mechanism, the gear 73 is sleeved on the spline shaft 72 and is driven to rotate by the spline shaft 72, the rack 74 is fixedly arranged on the sampling assembly 4, and the rack 74 is meshed with the gear 73 to drive the Z-direction of the sampling assembly 4 to move.

On the basis of the technical scheme, a first sliding block is fixedly arranged on the rack 74, the sampling assembly 4 is fixedly arranged on the first sliding block, a guide rail 12 is arranged on the mounting seat 3, and the first sliding block is matched with and in sliding connection with the guide rail 12; the spring shifting sleeve 10 is sleeved on the screw rod 62, one end of the spring shifting sleeve is fixedly arranged on the mounting seat 3, the other end of the spring shifting sleeve is fixedly connected with the supporting spring 11, and the other end of the supporting spring 11 is fixedly arranged on the outer side wall of the guide rail 12.

Specifically, the spring shifting sleeve 10 is sleeved on the lead screw 62, one end of the spring shifting sleeve is fixedly arranged on the mounting seat 3, the other end of the spring shifting sleeve is fixedly connected with the supporting spring 11, the other end of the supporting spring 11 is fixedly connected with the side wall of the guide rail 12, as shown in the figure, the top end of the spring shifting sleeve 10 is provided with a first fixing claw 101, the bottom end of the spring shifting sleeve is fixedly provided with a second fixing claw 102, the first fixing claw 101 is fixedly arranged on the mounting seat 3, and the supporting spring 11 is fixedly arranged between the second fixing claw 102 and the guide rail 12.

On the basis of the above technical solution, the inner side wall of the gear 73 is symmetrically provided with the accommodation groove 731, the outer side wall of the spline shaft 72 is correspondingly provided with the key groove 721, the accommodation groove 731 and the key groove 721 are buckled to form an accommodation space, and the accommodation space is internally provided with the balls 75.

As shown in fig. 5 to 7, the spline shaft 72 is provided with a key slot 721, the gear 73 is sleeved on the outer side of the spline shaft 72, the rotation of the spline shaft 72 can drive the gear 73 to rotate, the rack 74 is fixedly arranged on the outer side wall of the housing 41 in the sampling assembly 4, the rack 74 is meshed with the gear 73, and when the gear 73 rotates, the rack 74 drives the sampling assembly 4 to move relative to the mounting seat 3 in the Z direction. Meanwhile, the shell 41 in the sampling assembly 4 is fixedly arranged on the first sliding block, the first sliding block is matched with the guide rail 12 on the mounting seat 3, a guiding effect is achieved, and the structure operation is stable.

By forming a containing space between the gear 73 and the spline shaft 72 and using balls 75 in a matched manner, the spline shaft 72 can drive the gear 73 to rotate, and the gear 73 and the rack 74 are matched to realize the movement of the sampling assembly 4 in the Z direction; in addition, balls are arranged between the spline shaft 72 and the gear 73, the gear 73 can also slide relative to the spline shaft 72, and when the mounting seat 3 is driven by the X-direction driving mechanism 6 to move in the X direction, the gear 73 and the mounting seat 3 can synchronously move on the spline shaft 72 in the X direction, so that a guiding function is realized. More preferably, as shown in fig. 8, the two sides of the gear 73 are symmetrically provided with a blocking cover 76, and the inner side wall of the blocking cover 76 is provided with a guide rail 761 matched with the key slot 721, so as to facilitate the sliding process of the gear 73 and the spline shaft 72.

Therefore, the gear 73, the ball 75 and the spline shaft 72 are matched to form an integral structure to realize double movement of rotation and sliding, the structure is more compact and simple, the structural size of the traditional gear rack is greatly reduced, the structural rigidity and the working reliability are improved, and the assembly and the use are more convenient. Because the traditional mode uses the drive shaft to drive the gear to rotate, the structure of adopting generally is that the outside cover of drive shaft is equipped with the spline housing, spline housing and gear fixed connection, and assembly structure is comparatively complicated, and is bulky, occupation space is big.

On the basis of the technical scheme, an anti-backlash nut 13 is arranged between the screw rod 62 and the mounting seat 3, the anti-backlash nut 13 is sleeved on the screw rod 62, and the spring shifting sleeve 10 is fixedly sleeved on the outer side wall of the anti-backlash nut 13.

Preferably, through setting up clearance nut 13, can improve the cooperation precision between lead screw 62 and the mount pad 3, when the speed of movement of lead screw 62 is very fast, can play the anti-shock effect, increase of service life. It should be noted that the gap eliminating nut is available from the prior art.

On the basis of the technical scheme, the sample frame 5 is slidably connected with the frame 1 through the Y-direction driving mechanism 8, the Y-direction driving mechanism 8 comprises a third motor 81, a belt transmission mechanism and a transmission block 82, the third motor 81 is fixedly arranged on the frame 1, the third motor 81 drives the belt transmission mechanism to rotate, the transmission block 82 is fixedly arranged on a belt in the belt transmission mechanism, and the sample frame 5 is fixedly arranged on the transmission block 82 and is slidably connected with the frame 1.

On the basis of the technical scheme, the sampling assembly 4 comprises a housing 41, a needle seat 42, a buffer spring 43 and an inner needle 44, wherein the housing 41 is fixedly arranged on a rack 74, the needle seat 42 is slidably arranged inside the housing 41, the buffer spring 43 is sleeved on the needle seat 42, one end of the buffer spring is abutted to the top end inside the housing 41, the other end of the buffer spring is fixedly arranged on the needle seat 42, one end of the inner needle 44 is fixedly arranged on the needle seat 42, and the other end of the inner needle extends to the outside of the housing 41.

As shown in fig. 8 and 9, by sleeving the buffer spring 43 on the needle seat 42, the buffer spring 43 is deformed when the inner needle 44 touches other objects, so as to determine the current working state of the sampling needle head; it should be noted that, the buffer spring 43 will also deform when the inner needle 44 normally pierces the soft rubber pad at the top end of the sample bottle, but the deformation amount at this time will not be detected, that is, the abnormal deformation amount of the buffer spring 43 will be detected, and the deformation amount is preset in advance in the control system of the automatic sample injection device. Through setting up buffer spring 43 and predetermining and detecting its deformation volume, judge the motion state of the interior needle 44 in the sampling assembly, take place unusual timely processing, effectively protect interior needle 44, prolong its life, reduce maintenance and change, promote work efficiency.

Specifically, the movement of the inner needle 44 is set to a preset distance before use, i.e., the sampling needle is moved to a prescribed distance in the sample bottle in the Z direction; during the actual sampling movement, the following states may occur:

if the inner needle 44 of the sampling assembly 4 does not move to a preset distance, the buffer spring 43 is detected to deform, so that the sampling needle is stuck on other parts, such as a hard plastic part at the edge of the top end of the sampling bottle, a sample rack and other hard parts, and abnormal alarm is generated to remind a worker of processing;

if the inner needle 44 of the sampling assembly 4 moves to a preset distance, the buffer spring 43 is detected to deform, which indicates that the sampling needle is pricked into a sample bottle, and indicates that the working state is normal;

if the inner needle 44 of the sampling assembly 4 is moved to a predetermined distance, no deformation of the buffer spring 43 is detected, indicating a puncture state, e.g. where no sample bottle is placed or the sampling assembly 4 is biased out of the sample holder 5, etc.

On the basis of the technical scheme, the sampling assembly 4 further comprises an outer needle 45, the outer needle 45 is fixedly arranged at the bottom end of the housing 41 and is communicated with the interior of the housing 41, the outer needle 45 is sleeved on the outer side of the inner needle 44, and the inner needle 44 is in sliding connection with the outer needle 45.

The outer needle 45 is sleeved on the outer side of the inner needle 44, so that a guiding effect is achieved in the process of puncturing the sample bottle by the inner needle 44 for sampling, and the inner needle 44 can be prevented from shaking and damaging due to the fact that the inner needle 44 is thinner, and the stability and the service life of the whole sampling needle are improved.

Preferably, the housing 41 is provided with a vent 46, a cavity is formed between the bottom end of the needle seat and the bottom end inside the housing, and the vent and the outer needle are both communicated with the cavity. On the one hand, the vent hole 46 is arranged on the shell 41 and is communicated with the outer needle 45, on the other hand, the sealed state is kept before the sealed sample bottle, namely the top soft rubber pad, the sample bottle is still kept in the sealed state after the inner needle 44 is punctured, and the accuracy of sucking the sample volume is poor in the negative pressure state, so that the vent hole 46 is communicated with the atmosphere through the outer needle 45, the pressure in the sample bottle can be balanced, the volume of sucking the sample is easy to control, and the accuracy of the sample test result is prevented from being influenced. More preferably, when the viscosity of the sample is high and the suction of the inner needle 44 is difficult, the high-pressure gas is connected through the vent hole 46 to be pressed into the sample bottle, so that the inner needle 44 and the injection pump can be assisted to take out the sample with high viscosity, and the application range is wider. On the other hand, after the needle head is sampled once, the air pump is connected to the outside of the vent hole 46 to introduce air into the vent hole 46, and air in the vent hole 46 enters the inside of the outer needle 45 through the cavity 47, so that residual samples in a gap between the inner side wall of the outer needle 45 and the outer side wall of the inner needle 44 can be removed, adverse effects on subsequent parameter detection such as concentration of other samples caused by sample residues are effectively avoided, and the device is particularly suitable for trace detection.

On the basis of the technical scheme, as shown in fig. 10, the syringe pump assembly 9 for taking out a sample is further included, the syringe pump assembly 9 comprises a valve head 91, a syringe pump tube 92, a push rod 93 and a belt transmission mechanism, a plurality of valve ports 94 are formed in the valve head 91, an inner needle is communicated with the valve ports, a rotary plate 95 is arranged on one side of the valve head 91 and is driven to rotate by a motor 96, a liquid channel is formed in the rotary plate 95 to achieve communication between two different valve ports 94, the syringe pump tube 92 is communicated with the valve ports 94, one end of the push rod 93 is slidably arranged inside the syringe pump tube 92, the other end of the push rod 93 is fixedly arranged on a second sliding block 97, and the second sliding block 97 is driven to move by the belt transmission mechanism.

Preferably, a fixed plate 911 is fixedly disposed on one side of the motor 96, a sliding rail 912 is disposed on the fixed plate 911, and the second slider 97 is adapted to and slidingly connected with the sliding rail 912.

According to the utility model, the belt transmission mechanism is adopted to drive the second sliding block 97 to move in the vertical direction, so that the transmission noise is low, and the structure is simpler; and because the flexibility characteristic of belt, adaptability is better, and the requirement on parallelism between the part is lower when installing, compares in the actuating mechanism of lead screw slider among the prior art, reduces holistic assembly machining precision, convenient assembly and regulation. And meanwhile, the fixing plate is used for fixing and mounting, so that the assembly structure is simpler and more compact, and the disassembly and assembly are more convenient.

Specifically, be provided with the liquid passageway on the rotary plate 95, drive the rotary plate 95 through motor 96 and rotate, the rotary plate 95 rotates the different angle promptly and can realize the intercommunication of two different valve ports 94, and one of them valve port 94 communicates with sample subassembly 4 through the pipeline, and another valve port 94 communicates through syringe 92, through the reciprocating motion of push rod 93 in syringe 92 promptly, can realize the feed liquor and the play liquid of different valve port 94 departments, sample and advance the sample work to the sample, and the operation is simpler and more convenient. The structure of the valve head can also refer to the patent (patent application number is CN202220012673.0, and the patent name is a high-precision high-pressure injection pump) applied by the company.

The top end of the inner needle 44 in the sampling assembly 4 is connected with one valve port 94, and the sample in the sample bottle is taken out through the inner needle 44 under the action of the push rod 93 and the injection pump tube 92 and pumped into an instrument to be detected through a liquid channel and a pipeline, so that the sample is detected. More preferably, the amount of the sample is changed by controlling the moving position of the push rod 93 during the sample injection operation, and the actually required sample injection volume is controlled, so that the problem of poor sample injection volume accuracy commonly existing in the sample injection device in the prior art is solved; meanwhile, partial sample injection or full-loop sample injection is realized by controlling the sample injection amount, so that the problem of single sample injection mode at present is solved.

It is to be understood that the outer side wall of the push rod 93 is in sealing connection with the inner side wall of the injection pump tube 92, and in a preferred mode, a sealing ring is arranged at the bottom end of the inner side wall of the injection pump tube 92, and the outer side wall of the push rod 93 is in butt joint with the sealing ring, so that the sealing connection between the push rod 93 and the injection pump tube 92 is realized.

It should be noted that the above-mentioned belt transmission mechanisms have the same structure, that is, the driving motor drives the driving wheel to rotate through the driving motor, the driving wheel, the driven wheel and the belt structure in the prior art, the driven wheel is driven to rotate through the belt by the driving wheel, and the driven wheel is connected with a part to be driven, so that the driving rotation is performed, and the belt transmission mechanism is one of transmission mechanisms commonly used by those skilled in the art. In the X-direction driving mechanism, a lead screw and a driven wheel are coaxially arranged and driven by the driven wheel to rotate; the working principle of the belt transmission mechanism in other driving mechanisms is the same, only the driven wheel driving parts are different, and the description is omitted.

More preferably, the second slider 97 is provided with a fixing rod 98, the push rod 93 is fixedly sleeved on the fixing rod 98, two sides of the push rod are fixed by a fastening piece 99, and an elastic mounting piece 910 is arranged between the push rod 93 and the fastening piece 99. Specifically, the fastener 99 is configured as a bolt, and one end of the push rod 93 is fixedly mounted on the fixing rod 98; preferably, elastic mounting pieces 910 are arranged between two sides of the push rod 93 and the bolts, and the deformation of the elastic mounting pieces 910 can offset the shaking of the push rod 93 in the moving process, so that the sealing performance between the push rod 93 and the injection pump tube 92 is ensured. In this embodiment, the elastic mounting member 910 is a rubber pad; however, the elastic mounting member 910 is not necessarily made of an elastic material, so long as the structure can achieve a certain elastic deformation.

It should be noted that, the X direction refers to the direction parallel to the screw rod, the Z direction refers to the direction parallel to the inner needle in the sampling assembly, and the Y direction refers to the direction parallel to the long side of the sample box, which is only for convenience in describing and understanding the technical scheme in combination with the drawings, and does not limit the technical scheme of the utility model.

While the basic principles and main features of the present utility model have been shown and described above, it will be apparent to those skilled in the art that the present utility model is not limited to the details of the above-described exemplary embodiments, and thus the embodiments should be regarded as illustrative rather than restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (10)

1. The novel sample injection device is characterized by comprising a frame (1), a supporting beam (2), a mounting seat (3), a sampling assembly (4), a sample frame (5), an X-direction driving mechanism (6) and a Z-direction driving mechanism (7); the device is characterized in that the supporting beam (2) is fixedly arranged on the frame (1), the mounting seat (3) is in sliding connection with the supporting beam (2) through an X-direction driving mechanism (6), the sampling assembly (4) is arranged on the mounting seat (3) in a sliding manner and is driven to slide by a Z-direction driving mechanism (7), a flexible assembly for compensating parallelism is arranged between the X-direction driving mechanism (6) and the Z-direction driving mechanism (7), the flexible assembly comprises a spring poking sleeve (10) and a supporting spring (11), the spring poking sleeve (10) is sleeved on the X-direction driving mechanism (6), one end of the spring poking sleeve is fixedly arranged on the mounting seat (3), the other end of the spring poking sleeve is fixedly connected with the supporting spring (11), and the other end of the supporting spring (11) is fixedly arranged on the Z-direction driving mechanism (7); the sample rack (5) is arranged on the frame (1) and is used for placing sample bottles.

2. The novel sample injection device according to claim 1, wherein the X-direction driving mechanism (6) comprises a first motor (61), a belt transmission mechanism and a screw rod (62), the first motor (61) is fixedly arranged on the supporting beam (2), the first motor (61) drives the screw rod (62) to rotate through the belt transmission mechanism, and the mounting seat (3) is sleeved on the screw rod (62) and is in sliding connection with the screw rod (62).

3. The novel sample injection device according to claim 2, wherein the Z-direction driving mechanism (7) comprises a second motor (71), a belt transmission mechanism, a spline shaft (72), a gear (73) and a rack (74), the second motor (71) is fixedly arranged on the supporting beam (2), the second motor (71) drives the spline shaft (72) to rotate through the belt transmission mechanism, the gear (73) is sleeved on the spline shaft (72) and is driven to rotate by the spline shaft (72), the rack (74) is fixedly arranged on the sampling assembly (4), and the rack (74) is meshed with the gear (73) to drive the Z-direction of the sampling assembly (4) to move.

4. The novel sample injection device according to claim 3, wherein a first sliding block is fixedly arranged on the rack (74), the sampling assembly (4) is fixedly arranged on the first sliding block, a guide rail (12) is arranged on the mounting seat (3), and the first sliding block is matched with and in sliding connection with the guide rail (12); the spring shifting sleeve (10) is sleeved on the screw rod (62), one end of the spring shifting sleeve is fixedly arranged on the mounting seat (3), the other end of the spring shifting sleeve is fixedly connected with the supporting spring (11), and the other end of the supporting spring (11) is fixedly arranged on the outer side wall of the guide rail (12).

5. The novel sample injection device according to claim 3, wherein the inner side wall of the gear (73) is symmetrically provided with accommodating grooves (731), the outer side wall of the spline shaft (72) is correspondingly provided with key grooves (721), the accommodating grooves (731) and the key grooves (721) are buckled to form accommodating spaces, and balls (75) are arranged in the accommodating spaces.

6. The novel sample injection device according to claim 2, wherein a gap eliminating nut (13) is arranged between the screw rod (62) and the mounting seat (3), the gap eliminating nut (13) is sleeved on the screw rod (62), and the spring shifting sleeve (10) is fixedly sleeved on the outer side wall of the gap eliminating nut (13).

7. The novel sample injection device according to claim 1, wherein the sample holder (5) is slidably connected with the frame (1) through a Y-direction driving mechanism (8), the Y-direction driving mechanism (8) comprises a third motor (81), a belt transmission mechanism and a transmission block (82), the third motor (81) is fixedly arranged on the frame (1), the third motor (81) drives the belt transmission mechanism to rotate, the transmission block (82) is fixedly arranged on a belt in the belt transmission mechanism, and the sample holder (5) is fixedly arranged on the transmission block (82) and is slidably connected with the frame (1).

8. A novel sample injection device according to claim 3, characterized in that the sampling assembly (4) comprises a housing (41), a needle seat (42), a buffer spring (43) and an inner needle (44), wherein the housing (41) is fixedly arranged on a rack (74), the needle seat (42) is slidably arranged inside the housing (41), the buffer spring (43) is sleeved on the needle seat (42) and one end of the buffer spring is abutted to the top end inside the housing (41), the other end of the buffer spring is fixedly arranged on the needle seat (42), one end of the inner needle (44) is fixedly arranged on the needle seat (42), and the other end of the inner needle extends to the outside of the housing (41).

9. The novel sample injection device according to claim 8, wherein the sampling assembly (4) further comprises an outer needle (45), the outer needle (45) is fixedly arranged at the bottom end of the housing (41) and is communicated with the interior of the housing (41), the outer needle (45) is sleeved on the outer side of the inner needle (44), and the inner needle (44) is in sliding connection with the outer needle (45).

10. The novel sample injection device according to claim 8, further comprising a syringe pump assembly (9) for taking out samples, wherein the syringe pump assembly (9) comprises a valve head (91), a syringe pump tube (92), a push rod (93) and a belt transmission mechanism, a plurality of valve ports (94) are arranged on the valve head (91), the inner needle is communicated with the valve ports, a rotary plate (95) is arranged on one side of the valve head (91) and is driven to rotate by a motor (96), a liquid channel is arranged on the rotary plate (95) to realize communication between two different valve ports (94), the syringe pump tube (92) is communicated with the valve ports (94), one end of the push rod (93) is slidably arranged inside the syringe pump tube (92), the other end of the push rod (93) is fixedly arranged on a second slide block (97), and the second slide block (97) is driven to move by the belt transmission mechanism.