CN219774724U

CN219774724U - Transmission structure and analyzer

Info

Publication number: CN219774724U
Application number: CN202321022838.1U
Authority: CN
Inventors: 张勇福; 刘伟
Original assignee: Zhongyuan Huiji Biotechnology Co Ltd
Current assignee: Zhongyuan Huiji Biotechnology Co Ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-09-29
Anticipated expiration: 2033-04-28

Abstract

The utility model discloses a transmission structure and an analyzer, wherein the transmission structure comprises a driving mechanism and a transmission assembly; the transmission assembly comprises a screw rod, a first positioning piece, a pre-tensioning piece and a connecting piece, wherein the connecting piece is sleeved on the screw rod and is in threaded connection with the screw rod, and the driving mechanism is in transmission connection with the screw rod so as to drive the screw rod to rotate by driving the screw rod, so that the connecting piece is driven to move relative to the screw rod; the first locating piece sets up between connecting piece and actuating mechanism, and the lead screw rotates and installs in first locating piece, and pretension piece cover is located the lead screw and is close to actuating mechanism's one end, pretension piece's both ends respectively with actuating mechanism and first locating piece butt, be formed with the butt portion on the lead screw, the butt portion deviates from one side butt of pretension piece with first locating piece. The transmission structure has the advantages of stable operation, good accuracy and prolonged service life of parts.

Description

Transmission structure and analyzer

Technical Field

The utility model relates to the technical field of motor transmission, in particular to a transmission structure and an analyzer.

Background

For some precision instruments, the actions of sampling, liquid discharging and the like are realized by doing work by virtue of a driving structure, and then the reciprocating part is driven to reciprocate by a transmission part, and the device is mainly driven by a screw rod, has the advantage of high control precision, is suitable for the precision instruments, but due to the reasons of processing precision, installation precision and the like, phenomena of play, play and the like can occur among parts moving mutually in a transmission structure, the running stability and the precision of the instrument are greatly influenced, the service life of each part can be influenced, the parts are more frequently replaced, and the use and maintenance cost of users is increased.

In view of the foregoing, there is a need for a new transmission structure and analyzer that solves or at least alleviates the above-mentioned technical drawbacks.

Disclosure of Invention

The utility model mainly aims to provide a transmission structure and an analyzer, and aims to solve the technical problems of poor running stability and accuracy of the instrument and short service life of parts in the prior art.

To achieve the above object, according to an aspect of the present utility model, there is provided a transmission structure including a driving mechanism and a transmission assembly; the transmission assembly comprises a screw rod, a first positioning piece, a pre-tensioning piece and a connecting piece, wherein the connecting piece is sleeved on the screw rod and is in threaded connection with the screw rod, and the driving mechanism is in transmission connection with the screw rod so as to drive the screw rod to rotate by driving the screw rod, so that the connecting piece is driven to move relative to the screw rod; the first locating piece set up in the connecting piece with between the actuating mechanism, the lead screw rotate install in first locating piece, pretension piece cover is located the lead screw is close to actuating mechanism's one end, pretension piece's both ends respectively with actuating mechanism with first locating piece butt, be formed with the butt portion on the lead screw, the butt portion with first locating piece deviates from one side butt of pretension piece.

In an embodiment, the pretensioning member includes a compression spring, and two ends of the compression spring respectively abut against the driving mechanism and the first positioning member.

In one embodiment, the compression spring is a conical spring.

In one embodiment, an annular groove is formed on one side, facing the compression spring, of the first positioning piece, and the compression spring abuts in the annular groove.

In an embodiment, the first positioning member includes a first bearing, the screw is rotatably mounted to an inner ring of the first bearing, and the annular groove is formed in an outer ring of the first bearing.

In an embodiment, the transmission assembly further includes a second positioning member, the second positioning member is disposed at an end of the screw rod away from the driving mechanism, and the screw rod is rotatably mounted on the second positioning member.

In an embodiment, the second positioning member includes a second bearing and a bearing cover, the screw rod passes through an inner ring of the second bearing, and the bearing cover abuts against a side of the second bearing facing away from the first positioning member.

In an embodiment, the driving mechanism comprises a stepping motor, a driving wheel, a driven wheel and a conveying piece, wherein an output shaft of the stepping motor is connected with the driving wheel, the conveying piece is respectively in transmission connection with the driving wheel and the driven wheel, and the screw rod is connected with the driven wheel.

In an embodiment, an annular groove is formed in the side of the driven wheel facing the first positioning piece, and the pretensioning piece abuts in the annular groove.

In one embodiment, the connecting piece comprises a screw rod and a connecting table which are connected with each other, and the screw rod is in threaded connection with the screw rod.

According to another aspect of the present utility model there is also provided an analyser comprising a transmission arrangement as described above, and further comprising a reciprocating member, the connector being connected to the reciprocating member.

According to the technical scheme, the driving mechanism drives the connecting piece in threaded connection with the screw rod to reciprocate in the length direction of the screw rod by driving the screw rod to rotate in the forward direction or in the reverse direction, so that the screw rod is prevented from deforming, the first positioning piece is sleeved on the screw rod to play a role in positioning and retaining the screw rod, and the first positioning piece cannot interfere with the rotation of the screw rod; however, due to errors such as machining precision and installation precision, the conditions such as play and the like can occur between the screw rod and the first positioning piece, and the running stability and accuracy of the instrument are greatly influenced; in the scheme, the pretension piece is arranged between the first positioning piece and the driving mechanism, the pretension piece is compressed during installation, a thrust force is needed to push the first positioning piece against the abutting part all the time, if the first positioning part moves towards the driving mechanism, the pretension piece is further compressed, the thrust force of the pretension piece is increased along with the pretension piece, so that the first positioning piece and the screw rod are always in a tight state with the abutting part in the moving process, the movement problem caused by the dimensional precision, the installation error, the movement jumping and the like of each part is effectively controlled, the running stability of the transmission assembly is ensured, the part loss caused by the movement is reduced, the service life is prolonged, and the cost is further reduced. The utility model has the advantages of stable operation, good accuracy, prolonged service life of parts and reduced cost.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the following brief description will be given of the drawings required for the description of the embodiments or the prior art, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained from the structures shown in these drawings without the need for inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a transmission structure according to an embodiment of the present utility model;

fig. 2 is a partial structural view of a first positioning member, an abutting portion and a screw according to an embodiment of the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Transmission structure	21	Screw rod
1	Driving mechanism	22	First positioning piece
				11	Stepping motor	23	Abutment portion
12	Driving wheel	24	Pretensioning element
				13	Driven wheel	25	Connecting piece
14	Conveying member	221	First bearing
				26	Second positioning piece	251	Screw rod
261	Second bearing	252	Connecting table
				262	Bearing cap

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" is at least two groups, for example, two groups, three groups, etc., unless explicitly specified otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or in communication with each other within two sets of elements or in interaction with each other, unless expressly defined otherwise. 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 addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Referring to fig. 1 and 2, according to an aspect of the present utility model, a transmission structure 100 is provided, which includes a driving mechanism 1 and a transmission assembly; the transmission assembly comprises a screw rod 21, a first positioning piece 22, a pretensioning piece 24 and a connecting piece 25, wherein the connecting piece 25 is sleeved on the screw rod 21 and is in threaded connection with the screw rod 21, and the driving mechanism 1 is in transmission connection with the screw rod 21 so as to drive the screw rod 21 to rotate by driving the screw rod 21, so that the connecting piece 25 is driven to move relative to the screw rod 21; the first positioning piece 22 is arranged between the connecting piece 25 and the driving mechanism 1, the screw rod 21 is rotatably arranged on the first positioning piece 22, the pretensioning piece 24 is sleeved at one end of the screw rod 21, which is close to the driving mechanism 1, two ends of the pretensioning piece 24 are respectively abutted to the driving mechanism 1 and the first positioning piece 22, an abutting part 23 is formed on the screw rod 21, and one side, deviating from the pretensioning piece 24, of the abutting part 23 is abutted to one side, deviating from the pretensioning piece 24, of the first positioning piece 22.

In the above embodiment, the driving mechanism 1 drives the connecting piece 25 in threaded connection with the screw 21 to reciprocate in the length direction of the screw 21 by driving the screw 21 to rotate in the forward direction or in the reverse direction, in order to prevent the screw 21 from deforming, the first positioning piece 22 is sleeved on the screw 21 to play a role in positioning and retaining the screw 21, and the first positioning piece 22 does not interfere with the rotation of the screw 21; however, due to errors such as machining precision and installation precision, the conditions such as play and the like can occur between the screw rod 21 and the first positioning piece 22, and the running stability and accuracy of the instrument are greatly influenced; in the solution of this embodiment, the pretension member 24 is disposed between the first positioning member 22 and the driving mechanism 1, where the pretension member 24 is compressed during installation, there is a thrust force to always press the first positioning member 22 against the abutment portion 23, if the first positioning portion will play towards the driving mechanism 1, the pretension member 24 will be further compressed, and the thrust force of the pretension member 24 will be increased accordingly, so that the first positioning member 22 and the screw 21 are always in a tight state with the abutment portion 23 during movement, thus effectively controlling the play problem caused by dimensional accuracy, installation error, movement jump of each component, ensuring the operation stability of the transmission assembly, reducing the loss of parts caused thereby, improving the service life, and further reducing the cost. The embodiment has the advantages of stable operation, good accuracy, prolonged service life of parts and reduced cost. The connecting piece 25 may be specifically connected to a component that needs to perform a reciprocating motion, such as a piston, so as to implement actions such as sucking, sampling, draining, and the like. The abutment portion 23 may specifically be a step provided on the lead screw 21.

Specifically, the pretensioner 24 includes a compression spring, both ends of which are respectively abutted with the driving mechanism 1 and the first positioning member 22. The compression spring may be a cylindrical spring or a conical spring.

Preferably, the compression spring is a conical spring. The conical spring is in a tower-shaped structure with one small end and one large end, the force curve is in a curve rising shape, and the characteristic line is in an increasing shape; taking the pretensioning member 24 compression process as an example, the force applied to the pretensioning member 24 does not change linearly, because the force applied to the pretensioning member is not only from self-applied compression, but also includes the force transmitted to the pretensioning member 24 by the first positioning member 22, and the force transmitted to the pretensioning member 24 by vibration generated by operation of the transmission assembly, and thus the overall force thereof changes non-linearly; the pretensioning member 24 is thus provided as a non-linear mechanical member that is more adaptable to changes in this force.

In one embodiment, to make the connection between the first positioning member 22 and the compression spring more stable, an annular groove is formed on the side of the first positioning member 22 facing the compression spring, the compression spring is abutted in the annular groove, and the annular groove is provided to fit the lower end of the compression spring.

Specifically, the first positioning member 22 includes a first bearing 221, the screw 21 is rotatably mounted on an inner ring of the first bearing 221, and the annular groove may be directly formed on an outer ring surface of the first bearing 221. In order to reduce the play, a downward force is required to be provided on the outer race of the first bearing 221, and therefore, by providing the pretensioning member 24, the inner race of the first bearing 221 receives the step-up force, and the outer race receives the downward force of the pretensioning member 24, the play is overcome, thereby improving the running stability.

Alternatively, in other embodiments, the first positioning member 22 may further include a first abutment portion, one side of which abuts against the outer ring of the first bearing 221, and the other side of which is formed with the above-mentioned annular groove, that is, the mounting member to which the compression spring is added.

In an embodiment, the transmission assembly further includes a second positioning member 26, the second positioning member 26 is disposed at an end of the screw 21 away from the driving mechanism 1, and the screw 21 is rotatably mounted on the second positioning member 26. The second positioning member 26 also plays a role in positioning and holding the screw 21, preventing the screw 21 from being deformed due to longer length and reducing the service life.

Specifically, the second positioning member 26 includes a second bearing 261 and a bearing cover 262, the lead screw 21 passes through an inner ring of the second bearing 261, and the bearing cover 262 abuts against a side of the second bearing 261 facing away from the first positioning member 22 to fix a position of the second bearing 261.

In one embodiment, the driving mechanism 1 comprises a stepping motor 11, a driving wheel 12, a driven wheel 13 and a transmission piece 14, wherein an output shaft of the stepping motor 11 is connected with the driving wheel 12, the transmission piece 14 is respectively connected with the driving wheel 12 and the driven wheel 13 in a transmission way, and a screw rod 21 is connected with the driven wheel 13. The transmission member 14 may be a synchronous belt, through which power of the driving wheel 12 is transmitted to the driven wheel 13; the conveyor may also be a chain. The output shaft of the stepping motor 11 is connected with the driving wheel 12, and particularly can be connected by a spline or other fixed connection modes; likewise, spline connection or other fixed connection modes can be adopted between the driven wheel 13 and the screw rod 21. By the structures of the driving wheel 12, the driven wheel 13 and the conveying piece 14, the moment of force output by the stepping motor 11 can be changed, overload of the stepping motor 11 is avoided, and the service life of the stepping motor 11 is prolonged.

The configuration of the driving mechanism 1 is not limited to the above, and the force may be transmitted by meshing gears, and the transmission member 14 or the like may not be provided.

In one embodiment, the driven wheel 13 is formed with an annular groove on the side facing the first positioning member 22, in which the pretensioning member 24 abuts. The annular grooves are arranged opposite to the annular grooves, and are respectively fitted and fixed at both ends of the pretensioning member 24, specifically, by arranging the annular grooves so as to fit the upper ends of the compression springs. Of course, a second abutting portion may be added, one end of the second abutting portion is fixedly connected with the driven wheel 13, and the annular groove is formed at the other end of the second abutting portion.

In an embodiment, as shown in fig. 1, in the direction of gravity, from top to bottom, the driven wheel 13, the pretensioning piece 24, the first bearing 221, the abutment portion 23, the connecting piece 25 and the second bearing 261 are sequentially arranged, the pretensioning piece 24 is arranged between the first bearing 221 and the driven pulley, and the thrust force of the pretensioning piece is always acted on the vertical direction of the first bearing 221 during the operation of the transmission assembly; compared with the case that the pre-tension member 24 is arranged below the first bearing 221, the pre-tension member 24 is arranged between the first bearing 221 and the driven wheel 13, so that the length of the screw rod 21 between the first bearing 221 and the second bearing 261 can be shortened, the stability of the screw rod 21 in the running process can be improved, and shaking can be reduced. And meanwhile, the influence of the gravity of the first bearing 221 on the pretensioning piece 24 is avoided, so that the stress source of the pretensioning piece 24 is reduced, and the operation of the transmission assembly is more stable.

In one embodiment, the connector 25 includes a screw 251 and a connection table 252 connected to each other, and the screw 251 is screwed with the screw 21. The screw 251 is provided with an internal thread, and is matched with the screw 21, and the outer surface of the screw 251 can be fixedly connected with the connecting table 252 in a spline mode or the like.

According to another aspect of the utility model, the utility model also provides an analyser comprising a transmission structure 100 as described above, and further comprising a reciprocating member to which the connection 25 is connected. The reciprocating component can be a piston component for various precise instruments, and the precise instruments can be various biochemical analyzers specifically. The specific structure of the transmission structure 100 refers to the above embodiment, and since the analyzer adopts all the technical solutions of the above embodiment, at least the analyzer has all the beneficial effects brought by the technical solutions of the above embodiment, and will not be described in detail herein. The specific working procedure is as follows: after the stepper motor 11 receives the working instruction, the control module of the analyzer controls the rotation steps of the stepper motor 11 through parameters such as the transmission ratio of the system, the stepping amount of the stepper motor 11, the diameter of the reciprocating part and the like, the motion is transmitted to the screw rod 21 through the driving wheel 12, the transmission piece 14 and the driven wheel 13, the screw rod 21 rotates and is further converted into the up-and-down motion of the screw rod 251 and the connecting table 252, and accordingly the reciprocating part is driven to reciprocate, and functions such as injection, sampling and liquid discharging are achieved.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims

1. The transmission structure is characterized by comprising a driving mechanism and a transmission assembly; the transmission assembly comprises a screw rod, a first positioning piece, a pre-tensioning piece and a connecting piece, wherein the connecting piece is sleeved on the screw rod and is in threaded connection with the screw rod, and the driving mechanism is in transmission connection with the screw rod so as to drive the screw rod to rotate by driving the screw rod, so that the connecting piece is driven to move relative to the screw rod; the first locating piece set up in the connecting piece with between the actuating mechanism, the lead screw rotate install in first locating piece, pretension piece cover is located the lead screw is close to actuating mechanism's one end, pretension piece's both ends respectively with actuating mechanism with first locating piece butt, be formed with the butt portion on the lead screw, the butt portion with first locating piece deviates from one side butt of pretension piece.

2. The transmission structure according to claim 1, wherein the pretensioning member includes a compression spring, both ends of which are respectively abutted with the driving mechanism and the first positioning member.

3. The transmission structure of claim 2, wherein the compression spring is a conical spring.

4. The transmission structure according to claim 2, wherein an annular groove is formed on a side of the first positioning member facing the compression spring, and the compression spring abuts in the annular groove.

5. The transmission structure of claim 4, wherein the first positioning member includes a first bearing, the lead screw is rotatably mounted to an inner race of the first bearing, and the annular groove is formed in an outer race of the first bearing.

6. The transmission structure of claim 1, wherein the transmission assembly further comprises a second positioning member disposed at an end of the screw remote from the drive mechanism, the screw being rotatably mounted to the second positioning member.

7. The transmission structure of claim 6, wherein the second positioning member includes a second bearing and a bearing cap, the lead screw passing through an inner race of the second bearing, the bearing cap abutting a side of the second bearing facing away from the first positioning member.

8. The transmission structure according to any one of claims 1 to 7, wherein the driving mechanism includes a stepping motor, a driving wheel, a driven wheel, and a transmission member, an output shaft of the stepping motor is connected to the driving wheel, the transmission member is in transmission connection with the driving wheel and the driven wheel, respectively, and the screw is connected to the driven wheel.

9. The transmission structure according to claim 8, wherein a side of the driven pulley facing the first positioning member is formed with an annular groove, and the pretensioning member abuts in the annular groove.

10. A transmission structure as claimed in any one of claims 1 to 7, wherein the connection member includes a screw and a connection table connected to each other, the screw being threadedly connected to the screw.

11. An analyser, comprising the transmission structure of any one of claims 1 to 10, further comprising a reciprocating member, the connector being connected to the reciprocating member.