CN211512933U

CN211512933U - Injection pump

Info

Publication number: CN211512933U
Application number: CN201921983287.9U
Authority: CN
Inventors: 刘华勇; 赵鹏仕; 伍鼎韡
Original assignee: Shenzhen Mindray Scientific Co Ltd
Current assignee: Shenzhen Mindray Scientific Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-09-18
Anticipated expiration: 2029-11-15

Abstract

The utility model discloses an injection pump, including pump main part, push-and-pull subassembly and the guiding mechanism of setting in the pump main part, guiding mechanism is including bearing seat and drive assembly, and drive assembly includes lead screw, screw and the slider assembly who is equipped with the guide bar piece, and the lead screw is rotatable to be installed bear the seat on, slider assembly passes through the screw and is connected with the screw drive for drive connection is connected the push-and-pull subassembly on the guide bar piece, and slider assembly includes slider body and mounting, is equipped with circular through-hole on the slider body, and the axis of screw circumscribed circle roughly coincides with the axis of circular through-hole, and the mounting is used for the screw to fix in circular through-hole, so that convert the rotation output of lead screw into slider body.

Description

Injection pump

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an injection pump.

Background

The injection pump is an essential liquid medicine transmission tool for modern medical work, and mainly utilizes a transmission device under the automatic control of a system to push a piston rod of an injector main body to inject and infuse so as to realize high-precision and stable liquid medicine transmission without pulsation.

In the working operation process of the injection pump, the injector main body is firstly installed on the injection pump for fixing, then the push-pull box is controlled to move, and after the push-pull box is abutted to a piston rod of the injector main body, the piston is pushed by the push-pull box to move, so that liquid medicine injection is realized.

Generally, the injection pump comprises a pump body, a push-pull assembly and a guide mechanism arranged in the pump body, wherein a sliding block used for connecting a nut and a hollow shaft is arranged on the guide mechanism, the sliding block is internally provided with the nut which is connected to a screw rod on the guide mechanism in a transmission manner, the shape of a through hole of the sliding block for mounting the nut is in an abnormal shape, the through hole is not only not beneficial to processing the through hole, but also the precision of the nut matched with the through hole is caused, and meanwhile, the nut is not convenient to disassemble.

SUMMERY OF THE UTILITY MODEL

The utility model provides an injection pump not only can be used for installing the processing of the through-hole of screw on the slider, but also ensures the precision behind screw and the slider cooperation, simple structure, and processing is convenient.

According to the utility model discloses an aspect, the utility model provides an injection pump, it includes:

the pump main body comprises a shell, wherein the shell is provided with a clamping unit for clamping and placing the syringe main body on the shell;

the push-pull assembly is used for driving a piston rod on the injector main body to perform linear motion so as to push liquid in the injector main body to move towards the injection direction;

the guide mechanism is arranged in the shell and comprises a bearing seat and a transmission assembly, the transmission assembly comprises a lead screw, a nut and a sliding block assembly provided with a guide rod piece, the lead screw is rotatably arranged on the bearing seat, and the sliding block assembly is in transmission connection with the lead screw through the nut and is used for driving a push-pull assembly connected to the guide rod piece;

the sliding block assembly comprises a sliding block body and a fixing piece, wherein a circular through hole is formed in the sliding block body, the axis of the circumscribed circle of the screw nut approximately coincides with the axis of the circular through hole, and the fixing piece is used for fixing the screw nut in the circular through hole so as to convert the rotation output of the screw rod into the linear motion of the sliding block body.

The utility model discloses an among the syringe pump, circular through-hole with the screw all is cylindricly, the screw is installed through clearance fit's mode in the circular through-hole.

In the syringe pump of the present invention, the fitting tolerance zone between the circular through hole and the nut is 0.005mm to 0.045 mm.

The utility model discloses an among the syringe pump, the outside of screw is equipped with at least one slot, be equipped with quantity on the slider body with the jack that the slot matches, the mounting includes:

the number of the bolts is matched with that of the slots or the jacks, the bolts penetrate through the jacks and are connected with the slots, and the bolts are used for fixing the screw on the circular through holes.

In the injection pump of the present invention, the fixing member further includes:

the fixed plate is installed on the sliding block body, a bolt fixing portion is arranged on the fixed plate, one end of a bolt is fixed to the bolt fixing portion, and the other end of the bolt penetrates through the jack and then is connected to the slot.

The utility model discloses an among the syringe pump, be equipped with the fixed orifices on the fixed plate, be equipped with the locking hole on the slider body, the mounting still includes:

and the locking piece penetrates through the fixing hole and then fixes the fixing plate on the locking hole.

The utility model discloses an among the syringe pump, the locking part with the quantity of bolt is two, two the locking part symmetry sets up two the both sides of bolt center line.

The utility model discloses an among the syringe pump, two the slot is followed screw axis direction interval sets up the outside of screw, and every the slot arrives the axis distance of the nearest terminal surface of screw equals.

The utility model discloses an among the syringe pump, the bolt fixed part is for setting up bolt fixed orifices on the fixed plate, the bolt with bolt fixed orifices interference fit.

The utility model discloses an among the syringe pump, the bolt includes that bolt main aspects and diameter are less than the bolt tip of bolt main aspects, the bolt tip is installed on the bolt fixed orifices.

In the injection pump of the present invention, the guide mechanism further includes:

the guide shaft is arranged on the bearing seat along the length direction of the bearing seat, and the sliding block body is arranged on the guide shaft in a sliding mode.

In the injection pump of the present invention, the slider assembly further comprises:

the shaft sleeve is nested on the sliding block body, and the guide shaft penetrates through the shaft sleeve.

The utility model discloses an among the injection pump, the one end of guide bar spare is fixed in the circular through-hole, the other end of guide bar spare passes bear behind the seat with the push-and-pull subassembly is connected.

The utility model discloses an among the injection pump, the one end of lead screw is rotationally installed bear the seat back of the body to the one end of guide bar spare, the other end of lead screw passes be located behind the screw nut the inboard of guide bar spare.

The utility model discloses an among the injection pump, bear and be equipped with displacement sensor on the seat, the sliding block set spare still includes:

and the displacement contact device is arranged on the sliding block body, is matched with the displacement sensor and is used for acquiring a distance signal of the sliding block body moving on the bearing seat in real time.

In the syringe pump of the present invention, the displacement contact device includes:

a contact fixing portion mounted on the slider body;

the contact is sleeved with an elastic piece and is arranged on the displacement contact device through the contact fixing part and is used for being in contact with the displacement sensor.

According to the utility model discloses a second aspect, the utility model also provides an injection pump, include:

the push-pull assembly comprises a box body and a driving mechanism arranged in the box body, the box body is provided with a clamping device for clamping the piston rod on the syringe main body, the driving mechanism comprises a driving part provided with a driving wheel, a first driven wheel and a second driven wheel, the box body is provided with a clamping device for clamping the piston rod and a pressure detection device for detecting the butt joint of the piston rod on the box body, the clamping device comprises a first clamping jaw and a second clamping jaw, the first clamping jaw is in transmission connection with the driving wheel through the first driven wheel, the second clamping jaw is in transmission connection with the first driven wheel through the second driven wheel, the automatic clamping function of the first clamping jaw and the second clamping jaw is realized, and a piston rod on the injector main body is driven to perform linear motion so as to push liquid in the injector main body to move towards the injection direction;

the sliding block assembly comprises a sliding block body and a fixing piece, wherein a circular through hole is formed in the sliding block body, the axis of the circumscribed circle of the nut approximately coincides with the axis of the circular through hole, and when the nut is installed in the circular through hole, the fixing piece sequentially penetrates through the sliding block body and the nut and then is fixed on the sliding block body and used for fixing the nut in the circular through hole.

The technical scheme provided by the embodiment of the application can have the following beneficial effects: the application designs an injection pump, because the through-hole that is used for installing the screw on the slider body is circular structure, the axis of screw circumcision circle roughly coincides with the axis of circular through-hole, and the machining precision of circular through-hole is ensured in the processing of the circular through-hole of so not only being convenient for, has also guaranteed the precision behind screw and the slider cooperation moreover, also is convenient for the dismantlement of screw simultaneously, simple structure, simple to operate.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic view of a part of a syringe pump according to an embodiment of the present invention;

FIG. 2 is a partially exploded schematic view of the syringe pump of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the guide mechanism of FIG. 1;

FIG. 4 is a partially exploded schematic view of the transmission assembly of FIG. 1;

FIG. 5 is a schematic view of the transmission gear of FIG. 1;

FIG. 6 is a schematic structural view of the lead screw of FIG. 1;

FIG. 7 is a schematic view of a portion of the slider assembly of FIG. 1;

FIG. 8 is a schematic partial cross-sectional view of the slider assembly of FIG. 1;

FIG. 9 is a partially exploded schematic view of the slider assembly of FIG. 1;

FIG. 10 is a partially exploded schematic view of the slider assembly of FIG. 1;

FIG. 11 is a schematic structural view of the slider body of FIG. 1;

FIG. 12 is a schematic structural view of the nut of FIG. 1;

FIG. 13 is a schematic cross-sectional view of the nut of FIG. 1;

FIG. 14 is a schematic view of the fastener of FIG. 1;

FIG. 15 is an exploded view of the anchor of FIG. 1;

FIG. 16 is a schematic diagram of the displacement contact apparatus of FIG. 1;

FIG. 17 is a schematic cross-sectional view of the displacement contact apparatus of FIG. 1;

FIG. 18 is an exploded view of the displacement contact assembly of FIG. 1;

FIG. 19 is a schematic structural view of the bit push-pull assembly of FIG. 1;

figure 20 is an exploded schematic view of the push-pull assembly of figure 1;

FIG. 21 is an exploded schematic view of the cartridge of FIG. 1;

FIG. 22 is an exploded schematic view of the first jaw of FIG. 1;

FIG. 23 is a schematic structural view of the card assembly of FIG. 1;

fig. 24 is an exploded schematic view of the pressure detection device in fig. 1.

Description of reference numerals:

10. a guide mechanism; 11. a transmission assembly; 12. a bearing seat; 111. a slider body; 1113. a circular through hole; 1114. a jack; 1115. locking holes; 1116. a guide rod screw hole; 1117. a displacement contactor mounting section; 112. a screw rod; 112a and a screw rod transmission part; 1122. a bearing member; 1123. a first transmission member; 113. a nut; 1131. a fixing member; 1131a, a bolt; 1131b, locking piece; 1131c, a fixing plate; 1132. a slot; 114. a guide bar member; 1141. a hollow structure; 115. a second transmission member; 1151. a keyway; 1142. arranging wires; 1143. a guide rod screw; 115. a second transmission member; 1151. a keyway; 116. a displacement contact; 1161. A contact; 1162. a contact fixing portion; 1163. an elastic member; 1164. a displacement contact through hole; 117. a shaft sleeve; 118. a guide shaft;

20. a push-pull assembly; 21. a clamping device; 211. a first jaw; 212. a second jaw; 212a, a second recess; 213. a seal ring; 22. a pressure detection device; 221. a soft rubber structure; 222. a pressure sensor; 223. a key section; 23. pushing and pulling the box; 231. a box body; 232. a cover body; 233. a seal member; 24. a board card assembly; 241. a drive member; 242. a driving wheel; 243. a first driven wheel; 244. a second driven wheel.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The application discloses syringe pump belongs to medical instrument technical field, is the essential liquid medicine transmission tool of modern medical work, and its transmission who mainly utilizes under the system automatic control promotes the piston rod of syringe main part and injects the infusion to realize high accuracy, steady no pulsatory liquid medicine transmission.

The injection pump is that the essential liquid medicine transmission tool of modern medical work is at the work operation in-process of injection pump, at first installs the syringe main part on the injection pump and fixes, then control push-and-pull box removes, treats push-and-pull box and syringe main part's piston rod butt back, just promotes the piston through push-and-pull box and removes to realize the liquid medicine injection.

Generally, the push-pull box is connected with a sliding block assembly on a guide mechanism, the guide mechanism is arranged in a pump body, a screw is arranged in the sliding block assembly, and the screw is in transmission connection with a lead screw on the guide mechanism. At present, the screw is the dysmorphism structure usually to the rotation output that can convert the lead screw into slider assembly's linear motion, but, when screw and slider cooperation, screw and slider relative position precision are relatively poor, and fixed knot constructs complicacy moreover, and it is inconvenient to dismantle.

As shown in fig. 1 to 24, the present application provides a syringe pump, which includes a pump main body, a push-pull assembly 20, and a guide mechanism 10 disposed in the pump main body, wherein the pump main body includes a housing, a clamping unit is disposed on the housing, the clamping unit is used for clamping a syringe main body placed on the housing, and the guide mechanism 10 is mounted in the housing. Wherein, guiding mechanism 10 includes bearing seat 12 and transmission assembly 11, transmission assembly 11 includes lead screw 112, screw 113 and the slider assembly who is equipped with the guide bar piece, lead screw 112 is rotatable to be installed on bearing seat 12, slider assembly passes through screw 113 and is connected with the transmission of lead screw 112 for drive the push-and-pull subassembly 20 of connection on the guide bar piece, push-and-pull subassembly 20 is used for driving the piston rod in the syringe main part and carries out linear motion, move toward the injection direction with the liquid that promotes in the syringe main part.

In the present embodiment, as shown in fig. 2 to 10, the slider assembly includes a slider body 111 and a fixing member 1131, wherein the slider body 111 is provided with a circular through hole 1113, and the fixing member 1131 is used for mounting the screw 113 on the circular through hole 1113 so as to convert the rotational output of the lead screw 112 into the linear motion of the slider body 111.

It should be noted that the shape of the nut may be any of various modifications of a circular shape, for example, the nut is a polygonal structure provided with a rounded corner, wherein the rounded corner of the polygonal structure is formed by a circumscribed circle of the polygonal structure, and an axis of the circumscribed circle is substantially coincident with an axis of the circular through hole, so that the nut can be placed in the through hole along the axis of the circular through hole by the rounded corner, and at the same time, the problem of coaxiality of the nut and the circular through hole can be ensured. In addition, the polygon includes a triangle, a quadrangle, and the like.

The fact that the axis of the circumscribed circle is approximately coincident with the axis of the circular through hole means that the offset between the axis of the circumscribed circle of the nut and the axis of the circular through hole is less than 1mm after the nut is installed in the circular through hole, and in a rational state, the axis of the circumscribed circle of the nut is coincident with the axis of the circular through hole, but the axis of the circumscribed circle of the nut and the axis of the circular through hole have some offset due to the outer side caused by machining and assembly.

When the nut 113 is installed in the circular through hole 1113, the fixing member 1131 sequentially passes through the slider body 111 and the nut 113 and then is fixed on the slider body 111, so as to fix the nut 113 in the circular through hole 1113, that is, one end of the fixing member 1131 is located on the slider body 111, and one end of the fixing member 1131 is located on the nut 113, so that the nut 113 can transmit power to the slider body 111, thereby converting the rotational output of the lead screw 112 into the linear motion of the slider body 111.

After the technical scheme is adopted, the circular through hole is of a circular structure, and the axis of the circumscribed circle of the nut is superposed with the axis of the circular through hole, so that the processing technology of the circular through hole 1113 and the nut 113 can be greatly simplified, the processing precision of the circular through hole 1113 is improved, and the manufacturing cost of the circular through hole 1113 is also reduced; meanwhile, the problem of low coaxiality of the assembled circular through hole 1113 and the nut 113 is solved, the assembly fixture has the advantages of being high in coaxiality, small in vibration, easy to install and the like after the nut 113 is assembled, the assembly quality of the nut 113 is effectively improved, and the rework rate of the assembled sliding block assembly is greatly reduced.

It should be noted that, in the mechanical processing, the simpler the components, the lower the processing cost, the higher the precision, and it is easy to ensure the parallelism of the circular through hole 1113 and the screw nut 113 relative to the screw rod 112, i.e. the slider body 111 can move linearly along the bearing seat 12 through the transmission of the screw nut 113 and the screw rod 112.

In an alternative embodiment, the circular through hole 1113 and the nut 113 are both circular structures, so that the positioning can be performed through the circular structures, the positioning accuracy is improved, the coaxiality of the circular through hole 1113 and the nut 113 is ensured, and then the connection is performed by using the fixing member 1131, that is, after the fixing member 1131 penetrates through the slider body 111, one part of the fixing member 1131 is located on the slider body 111, and the other part of the fixing member 1131 is located on the nut 113, so that the nut 113 converts the rotation output of the screw rod 112 into the linear motion of the slider body 111.

In an optional embodiment, since the slider body 111 and the nut 113 are separated, wherein the slider body 111 only makes a linear motion along the length direction of the bearing seat 12 to drive the push-pull assembly 20 to move in the same direction, the precision requirement of the external structure of the slider body 111 does not need to be considered; the nut 113 is directly engaged with the screw rod 112, which directly affects the injection molding amount of the liquid in the syringe body, and not only the transmission accuracy of the nut 113 and the screw rod 112 needs to be ensured, but also the strength and hardness of the nut 113 and the screw rod 112 need to be ensured. Therefore, after the above technical solution is adopted, the processing requirements of the slider body 111 and the nut 113 can be changed according to the difference, for example, the slider body 111 is molded by using a die casting mold, and then the circular through hole 1113 is formed on the slider body 111 by using a machining process, so as to ensure the assembly accuracy of the circular through hole 1113 and the nut 113; the nut 113 is directly formed by adopting a machining process, so that the assembling precision of the nut 113 and the circular through hole 1113 can be ensured, the transmission precision of the nut 113 and the screw rod 112 can also be ensured, and the machining process of the slider body 111 and the nut 113 is greatly reduced.

In an alternative embodiment, the nut 113 is installed in the circular through hole 1113 by a clearance fit, which not only facilitates the processing of the circular through hole 1113 and the nut 113; and the nut 113 can be conveniently assembled in the circular through hole 1113, or the nut 113 can be disassembled from the circular through hole 1113, so that the subsequent replacement of the nut 113 is convenient, the maintenance cost of the injection pump is reduced, and the coaxiality of the nut 113 and the slider body 111 after assembly is ensured.

In an alternative embodiment, the tolerance band of the fit between the circular through hole 1113 and the nut 113 is 0.005mm to 0.045mm, which may be determined by the diameter and the force condition of the circular through hole 1113 or the nut 113. In the present embodiment, the diameter of the circular through hole 1113 or the nut 113 is 12 to 15mm to ensure the coaxiality of the nut 113 and the slider body 111 after assembly, and to overcome the problem of coaxiality caused by the separation of the slider body 111 and the nut 113.

In an alternative embodiment, as shown in fig. 9 to 15, the fixing member 1131 includes a pin 1131a, at least one slot 1132 is provided on an outer side of the nut 113, and a number of insertion holes 1114 matching with the slot 1132 are provided on the slider body 111. In this embodiment, the number of pins 1131a matches the number of slots 1132 or sockets 1114, and the pins 1131a pass through the sockets 1114 and connect to the slots 1132, so as to fix the nut 113 in the circular through hole 1113.

Specifically, the inner diameters of the slot 1132 and the socket 1114 are consistent with the outer diameter of the pin 1131a, so that the error between the pin 1131a and the slot 1132 and the socket 1114 can be reduced to the maximum extent, thereby ensuring the coaxiality of the nut 113 and the slider body 111 after assembly, and ensuring that the nut 113 can be installed at the specified position of the circular through hole 1113.

In an alternative embodiment, the fixing member 1131 further includes a fixing plate 1131c, and the fixing plate 1131c is mounted on the slider body 111. In this embodiment, the fixing plate 1131c is provided with a pin fixing portion, one end of the pin 1131a is fixed on the pin fixing portion, and the other end of the pin 1131a passes through the insertion hole 1114 and then is connected to the insertion groove 1132.

Specifically, slider body 111 has the fixed plate mounting plane in the terminal surface processing of jack 1114, not only make things convenient for processing and the location of follow-up jack 1114 like this, but also can ensure that screw 113 passes through mounting 1131 and install when circular through-hole 1113, fixed plate 1131c laminating is on the fixed plate mounting plane, improve fixed plate 1131c and slider body 111 fixed stability, avoid slider body 111 to take place to drop at removal in-process fixed plate 1131c, the separation of the bolt 1131a of also being convenient for simultaneously, direct fixed plate 1131c through dismantling alright take out bolt 1131a promptly, then carry out the change of screw 113.

In an optional embodiment, fixing element 1131 further includes a locking element 1131b, fixing holes are formed in fixing plate 1131, locking holes 1115 are formed in slider body 111, the positions of locking holes 1115 correspond to the positions of fixing holes, and fixing element 1131c is fixed on locking holes 1115 after fixing element 1131b passes through fixing holes.

Specifically, the locking members 1131b are screws, and the locking holes 1115 are threaded holes, that is, the locking members 1131b are threaded through the fixing holes and then are connected to the locking holes 1115, so as to fix the fixing plate 1131c to the slider body 111, which not only is easy to assemble and disassemble, but also ensures that the fixing plate 1131c can be stably fixed to the slider body 111.

In an optional embodiment, the number of the locking elements 1131b and the number of the pins 1131a are two, wherein the two locking elements 1131b are symmetrically disposed on two sides of a central connecting line of the two pins 1131a, so as to ensure the balance of the force applied to the fixing plate 1131c, that is, the fixing plate 1131c can be fixed by the two locking elements 1131b located on two sides of the central connecting line of the pins 1131a, so as to prevent the pins 1131a from deviating or pressing the fixing plate 1131c upwards to separate the fixing plate 1131c from the slider body 111 when the fixing plate 1131c drives the nut 113 by the lead screw 112 due to different positions of the pins 1131a and the fixing plate 1131c is converted into linear motion of the slider body 111 by the nut 113, thereby improving the reliability of the slider assembly during transmission.

In an alternative embodiment, two slots 1131a are spaced outside the nut 1131a along the axial direction of the nut 113, and the axial distance from each slot 1131a to the nearest end surface of the nut 113 is equal.

Specifically, the screw 113 mainly converts the rotational output of the lead screw 112 into the linear motion of the slider body 111, the screw 113 and the circular through hole 1113 are both cylindrical, the latch 1131a is connected between the screw 113 and the slider body 111, when the slider body 111 moves linearly along the bearing seat 12, the force borne by the latch 1131a is the shear stress, and in order to reduce the shear stress of the latch 1131a, a corresponding number of latches 1131a are added according to the axial length of the screw 113, therefore, in this embodiment, the number of the latches 1131a is two, and the two latches 1131a are arranged at intervals along the axial direction of the screw 113, and the distance between the two latches and the nearest end surface of the screw 113 is equal, for example, the distance between the latch 1131a on the left side of the displacement screw 113 and the left end surface of the screw 113 is equal to the distance between the latch 1131a on the right side of the displacement screw 113 and the right end surface of the screw 113, so that the rotational torque of the screw 113 can be transmitted, while ensuring that each pin 1131a experiences approximately equal shear stresses.

In an alternative embodiment, the latch fixing portion is a latch fixing hole disposed on fixing plate 1131c, and latch 1131a is in interference fit with the latch fixing hole, so that latch 1131a and fixing plate 1131c are connected into a whole, which facilitates the detachment of latch 1131a, and not only is the structure simple, but also the manufacturing cost of fixing member 1131 is not increased additionally.

In an alternative embodiment, the latch 1131a includes a large latch end and a small latch end with a diameter smaller than that of the large latch end, and the small latch end is mounted on the latch fixing hole to prevent the latch 1131a from being separated from the fixing plate 1131c during the movement of the slider body 111.

In an alternative embodiment, as shown in fig. 2, 3, and 9 to 11, the guide mechanism 10 further includes a guide shaft 118, the guide shaft 118 is mounted on the carrier 12 along the length direction of the carrier 12, and the slider body 111 is slidably mounted on the guide shaft 118 to ensure that the slider body 111 can move along the straight line of the carrier 12.

Specifically, the slider assembly further includes a shaft sleeve 117, the shaft sleeve 117 is nested on the slider body 111, wherein the guide shaft 118 is inserted into the shaft sleeve 117, so as to improve the transmission precision of the slider body 111 and the stability of the slider body 111 in the process of re-transmission. In this embodiment, the number of the bushings 117 and the guide shafts 118 is two, the slider body 111 is provided with bushing grooves 1111 and bushing holes 1112, the bushing grooves 1111 and the bushing holes 1112 are respectively provided on both sides of the slider body 111 in the width direction, and the two bushings 117 are correspondingly installed in the bushing grooves 1111 and the bushing holes 1112, so that the structure is compact and the installation is easy.

In addition, since the circular through hole 1113 and the nut 113 are both non-special-shaped structures, when the slider body 111 is processed, the relative parallelism between the circular through hole 1113 and the bushing slot 1111 and the bushing hole 1112 can be easily ensured, that is, the slider body 111 can always be ensured to make linear motion along the direction of the bearing seat 12 without causing abrasion accidents of the slider body 111 or other parts on the slider body 111, thereby avoiding the life shortening of the slider body 111 or other parts on the slider body 111.

In an alternative embodiment, one end of the guide rod 114 is fixed to the circular through hole 1113, and the other end of the guide rod 114 passes through the carrier 12 and is connected to the push-pull assembly 20, so that the push-pull assembly 20 drives the piston rod of the syringe body to perform a linear motion, thereby pushing the liquid in the syringe body to move in the injection direction.

Specifically, the inner side of the guide rod 114 is provided with a hollow structure 1141, the outer side of the guide rod 114 is movably mounted on the bearing seat 12 through a linear bearing sleeve, and the hollow structure 1141 is provided with a flat cable 1142 for electrically connecting with the board card assembly inside the push-pull assembly 20. In this embodiment, the guide member 114 is fixed to the guide screw hole 1116 by a guide screw 1143 to ensure the coaxiality of the guide member 114 and the nut 113.

Of course, one end of the guide rod 114 may be fixed to another position of the slider body 111, and the purpose is mainly to drive the push-pull assembly, but in this embodiment, the guide rod 114 is installed in the circular through hole 1113, so that on one hand, a mounting portion for installing the guide rod 114 on the slider body 111 is avoided, and on the other hand, the coaxiality between the guide rod 114 and the nut 113 is also ensured.

In an alternative embodiment, one end of the screw rod 112 is rotatably mounted on an end of the bearing seat 12 opposite to the guide rod 114, and the other end of the screw rod 112 passes through the nut 113 and is located inside the guide rod 114.

Specifically, as shown in fig. 2 to fig. 6, one end of the screw rod 112 away from the guide rod 114 is provided with a screw rod transmission part 112a, the screw rod transmission part 112a is rotatably mounted on the carrying seat 21 through a bearing member 1122, the end of the screw rod transmission part 112a is connected with a first transmission member 1123, and the outer side of the first transmission member 1123 is provided with a key tooth for matching and connecting with the key groove 1151 on the second transmission member 115. In the present embodiment, a position of the screw transmission portion 112a away from the first transmission member 1123 is mounted with a limit snap ring 1121 to limit the length of the screw 112 passing through the bearing member 1122.

In an alternative embodiment, as shown in fig. 9 to 18, the slider assembly further includes a displacement contact device 116, a displacement sensor is disposed on the bearing seat, and the displacement contact device 116 is mounted on the slider body 111 and cooperates with the displacement sensor for acquiring a distance signal of the movement of the slider body 111 on the bearing seat in real time.

Specifically, the displacement contact device 116 includes a contact 1161, a contact fixing portion 1162 and an elastic member 1163, the elastic member 1163 is sleeved on the contact 1161, and the contact 1161 is mounted on the displacement contact device 116 through the contact fixing portion 1162 and is used for contacting with the displacement sensor to identify a distance signal of the slider body 111 moving on the bearing seat.

In the present embodiment, the contact fixing portion 1162 is fixed to the moving contact 116 by means of a snap fit, and the moving contact 116 is fixed to the moving contact mounting portion 1117 by means of a screw, wherein the screw is connected to the moving contact mounting portion 1117 after passing through the moving contact through hole 1164, so as to fix the moving contact 116 to the slider body 111.

In an alternative embodiment, as shown in fig. 19 to 24, the push-pull assembly 20 includes a push-pull box 23, a board card assembly 24 disposed inside the push-pull box 23, a clamping device 21, and a pressure detection device 22, wherein the push-pull box 23 includes a box body 231, a cover 232, and a sealing member 233 connected between the box body 231 and the cover 232, the clamping device 21 is in transmission connection with a driving mechanism on the board card assembly 24 for automatically clamping a piston rod on the syringe body, and the pressure detection device 22 is used for detecting a pressure of the piston rod on the syringe body against the box body.

It is specific, box body 231 and lid 232 mutually support and form and hold the cavity, integrated circuit board subassembly 24 is installed in holding the cavity, clamping device 21 and pressure measurement device 22 are all installed in the outside of box body 231, and be provided with waterproof between clamping device 21 and pressure measurement device 22 and the box body 231, in order completely cut off external liquid entering box body 231, lead to holding the sensor failure on integrated circuit board subassembly 24 or the pressure measurement device 22 in the cavity, also ensured simultaneously that the syringe pump can use for a long time in abominable service environment, and improved the life of syringe pump.

After the technical scheme is adopted, because the clamping device 21 and the pressure detection device 22 are provided with waterproof parts between the box body 231, and the sealing part 233 is connected between the box body 231 and the cover body 232, so that liquid can be prevented from entering the accommodating cavity from the gap between the box body 231 and the cover body 232, or the gap between the box body 231 and the clamping device 21, or the gap between the box body 231 and the pressure detection device 22, the waterproof performance of the push-pull box 23 is obviously improved, and meanwhile, the injection pump can be ensured to be used in a severe use environment for a long time.

In an alternative embodiment, the clamping device 21 comprises a first clamping jaw 211 and a second clamping jaw 212, and the waterproof part comprises two sealing rings 213, wherein the first clamping jaw 211 penetrates through the box body 231 and is in transmission connection with the driving mechanism, and one of the two sealing rings 213 is arranged at the connection position of the first clamping jaw 211 and the box body 231; the second jaw 212 passes through the cassette 231 and is capable of cooperating relative to the first jaw 211 to grip the plunger rod on the syringe body, the other of the two sealing rings 213 being provided at the junction of the second jaw 212 and the cassette 231.

Because the rotating speed of the first clamping jaw 211 and the second clamping jaw 212 is relatively low relative to the box body 231, the total squeezing amount of the two sealing rings 213 squeezed does not affect the rotation of the first clamping jaw 211 and the second clamping jaw 212, or the contact parts of the sealing rings 213 and the first clamping jaw 211 and the box body 231 can be coated with lubricant, or the contact parts of the sealing rings 213 and the second clamping jaw 212 and the box body 231 can be coated with lubricant, so as to reduce the friction between the sealing rings 213 and the first clamping jaw 211, or between the sealing rings 213 and the second clamping jaw 212, or between the sealing rings 213 and the box body 231, and further improve the service life of the sealing rings 213. Simple structure not only can effectively improve the waterproof performance of push-and-pull box 23, and assembly manufacturing cost is lower moreover.

In an alternative embodiment, the first jaw 211 includes a first clip rotatably mounted on the outside of the case 231 and a first transmission shaft integrally formed with the first clip. In this embodiment, the driving mechanism passes through first transmission shaft drives first clip and rotates, and sealing washer 213 cover is established on first transmission shaft, simple structure, also avoids sealing washer 213 to take place the skew when first clip relatively rotates simultaneously, effectively improves the waterproof performance of first clamping jaw 211 at the box body 231 junction.

In an alternative embodiment, one of the first clip and the cartridge 231 is provided with a first recess provided at a junction of the first clip and the cartridge 231, and the first recess is recessed to a depth less than a diameter of the sealing ring 213, and the sealing ring 213 is mounted on the first recess.

Specifically, the first recess may be disposed on the cartridge 231, or may be disposed on the first clip, and the specific position of the first recess is at the connection position of the first clip and the cartridge 231. When the first jaw 211 is mounted on the cartridge body 231, the sealing ring 213 may be just mounted on the first recess, and the sealing ring 213 forms a compression by the cooperation of the first clip and the cartridge body 231, so that the sealing ring 213 expands and compresses in the radial direction to improve the sealing effect of the cartridge body 231.

In an optional embodiment, the second clamping jaw 212 includes a second clamp and a second transmission shaft, the second clamp is rotatably installed at the outer side of the box 231, the second transmission shaft and the second clamp are integrally formed, the driving mechanism drives the second clamp to rotate through the second transmission shaft, the sealing ring 213 is sleeved on the second transmission shaft, the structure is simple, meanwhile, the sealing ring 213 is prevented from shifting when the second clamp rotates relatively, and the waterproof performance of the second clamp at the joint of the box 231 is effectively improved.

In an alternative embodiment, one of the second clip and the cartridge body 231 is provided with a second recess 212a, the second recess 212a is provided at a junction of the second clip and the cartridge body 231, and the second recess 212a is recessed to a depth smaller than a diameter of the sealing ring 213, and the sealing ring 213 is mounted on the second recess 212 a.

Specifically, the second recess 212a may be disposed on the cartridge 231 or on the second clip, and the specific position of the second recess 212a is at the connection position of the second clip and the cartridge 231. When the second jaw 212 is mounted on the cartridge body 231, the sealing ring 213 may be just mounted on the second recess 212a, and the sealing ring 213 forms a compression by the cooperation of the second clip with the cartridge body 231, so that the sealing ring 213 is expanded and compressed in the radial direction to improve the sealing effect of the cartridge body 231.

In an alternative embodiment, the sealing rings 213 are made of an elastic plastic material, such as a silicone material.

In an alternative embodiment, the driving mechanism includes a driving member 241, a first driven wheel 243 and a second driven wheel 244, wherein the driving member 241 is provided with a driving wheel 242, the first driven wheel 243 is connected with the driving wheel 242 in a meshing manner, and the second driven wheel 244 is connected with the first driven wheel 243 in a meshing manner. In this embodiment, the first clamping jaw 211 is in transmission connection with the first driven wheel 243, and the second clamping jaw 212 is in transmission connection with the second driven wheel 244, so that not only the first clamping jaw 211 can be linked relative to the second clamping jaw 212 and used for clamping the piston rod on the syringe body, but also the automatic clamping function of the first clamping jaw 211 and the second clamping jaw 212 can be realized through the driving part 241.

In an optional embodiment, the first driven wheel 243 and the second driven wheel 244 are both incomplete gears, so that the first driven wheel 243 and the second driven wheel 244 can be correspondingly foolproof according to the structure of the incomplete gears, the problem of wrong reverse rotation during assembly of the first driven wheel 243 and the second driven wheel 244 is avoided, and the assembly efficiency is improved.

Specifically, the board card assembly 24 is provided with a first rotating shaft and a second rotating shaft, one end of the first rotating shaft, which is far away from the first clip, penetrates through the box body 231 and then is rotatably connected with the first rotating shaft, and the first driven wheel 243 is sleeved on the first rotating shaft so as to improve the rotating balance of the first rotating shaft, that is, two ends of the first rotating shaft are rotatably mounted on the box body 231 and the first rotating shaft respectively; one end of the second transmission shaft, which is far away from the second clamp, penetrates through the box body 231 and then is rotatably connected with the second rotating shaft, and the second driven wheel 244 is sleeved on the second transmission shaft so as to improve the rotating balance of the second transmission shaft, namely, two ends of the second transmission shaft are respectively rotatably arranged on the box body 231 and the second rotating shaft.

After the technical problems are adopted, because the sealing rings 213 are respectively arranged between the first clamping jaw 211 and the box body 231 and between the second clamping jaw 212 and the box body 231, the situation that external liquid enters the accommodating cavity from the gap between the first clamping jaw 211 and the box body 231 and the gap between the second clamping jaw 212 and the box body 231 can be prevented, the failure of components on the board card assembly 24 or a sensor on the pressure detection device 22 in the accommodating cavity is influenced, meanwhile, the failure problem that the first transmission shaft, the second transmission shaft, the driving wheel 242, the first driven wheel 243 and the second driven wheel 244 are corroded by liquid or generate gluing and cannot operate is avoided, and the service life of the push-pull assembly 20 is effectively prolonged.

In an alternative embodiment, a flange is disposed around one of the cover 232 and the box 231, a groove adapted to the flange is disposed on the other of the cover 232 and the box 231, the sealing member 233 is disposed on the flange, and two sides of the sealing member 233 abut against the cover 232 and the box 231 respectively.

Specifically, a ring of flange is annularly arranged on the cover 232, a groove matched with the flange is arranged on the box 231, when the sealing member 233 is installed on the flange, the cover 232 is covered on the box 231 through the flange, at this time, the sealing member 233 deforms under the extrusion of the cover 232 and the box 231, so that the accommodating cavity in the box 231 forms a closed cavity, thereby preventing external liquid from entering the accommodating cavity through a gap between the cover 232 and the box 231, and causing the failure of components on the board card assembly 24 in the accommodating cavity or a sensor on the pressure detection device 22,

in an alternative embodiment, the pressure detection device 22 includes a key portion 223 and a pressure sensor 222, the waterproof member includes a soft rubber structure 221, wherein the key portion 223 protrudes from the outer side of the box 231, and the position of the key portion 223 corresponds to the position of the end of the piston rod; the pressure sensor 222 is arranged on the inner side of the box body 231, the soft rubber structure 221 is connected between the pressure sensor 222 and the key part 223, and the soft rubber structure deforms under the extrusion of the pressure sensor 141 and the box body 231, so that the pressure sensor 222 and the driving mechanism are sealed in the accommodating cavity.

Specifically, flexible glue structure 221 is including pressing the splenium, extrusion portion and capillary groove, be connected with the preforming on the pressure sensor 222, press the splenium to connect between preforming and button portion 223, the extrusion portion is connected between pressure sensor 222 and box body 231, the capillary groove is connected between pressing splenium and extrusion portion, thereby can ensure the leakproofness that preforming and button portion 223 are connected, and the leakproofness that pressure sensor 222 and box body 231 are connected has also been ensured, in addition can ensure again and press the elasticity performance between splenium and the extrusion portion, simple structure is but practical.

In an alternative embodiment, in order to further improve the waterproof performance between the pressure detection device 22 and the box body 231, a sensor flange is provided on the pressure sensor 222, the pressing portion is of a concave structure, that is, the pressing portion is sleeved on the sensor flange, the pressure sensor 222 is fixed on the box body 231 through a fixing screw, the pressing sheet is connected with the key portion 223 through a locking screw, and the pressing portion is located between the pressing sheet and the key portion 223.

In an optional implementation manner, an encapsulating portion is provided on the cover 232, the encapsulating portion is wrapped on an end surface of the cover 232 facing away from the box body 231, specifically, a cover through hole is provided on an end surface of the cover 232 facing away from the box body 231, a screw passes through the cover through hole and then is in threaded connection with a stud on the box body 231, so as to cover the cover 232 on the box body 231, and then the encapsulating portion is attached to the end surface of the cover through hole on the box body 231, so as to improve the waterproof performance of the push-pull box, thereby preventing liquid outside the push-pull box from entering the accommodating cavity from the cover through hole, and causing the failure of a component on the board card assembly 24 or a sensor on the pressure detection device.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description of the present specification, reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A syringe pump, comprising:

2. The syringe pump of claim 1, wherein the nut is shaped in a circular configuration, the nut being mounted in the circular through hole with a clearance fit.

3. The syringe pump of claim 1, wherein the fit tolerance band between the circular through hole and the nut is 0.005mm-0.045 mm.

4. The syringe pump of claim 2 or 3, wherein the outer side of the nut is provided with at least one slot, the slider body is provided with a number of insertion holes matching with the number of slots, and the fixing member comprises:

5. The syringe pump of claim 4, wherein the fixture further comprises:

6. The syringe pump of claim 5, wherein the fixing plate is provided with a fixing hole, the slider body is provided with a locking hole, and the fixing member further comprises:

7. The syringe pump of claim 6, wherein the number of the locking pieces and the number of the latches are two, and the two locking pieces are symmetrically arranged on two sides of a central connecting line of the two latches.

8. The syringe pump of claim 4, wherein two of the slots are spaced along the axial direction of the nut outside the nut, and the axial distance from each slot to the nearest end surface of the nut is equal.

9. The syringe pump of claim 5, wherein the pin fixing portion is a pin fixing hole provided in the fixing plate, and the pin is in interference fit with the pin fixing hole.

10. The syringe pump of claim 9, wherein the pin includes a pin large end and a pin small end having a smaller diameter than the pin large end, the pin small end being mounted on the pin fixing hole.

11. The syringe pump of claim 1, wherein the guide mechanism further comprises:

12. The syringe pump of claim 11, wherein the slider assembly further comprises:

13. The syringe pump of claim 1, wherein one end of the guide rod is fixed in the circular through hole, and the other end of the guide rod passes through the bearing seat and is connected with the push-pull assembly.

14. The syringe pump of claim 13, wherein one end of the screw rod is rotatably mounted on an end of the bearing seat opposite to the guide rod, and the other end of the screw rod passes through the nut and is located inside the guide rod.

15. The syringe pump of claim 1, wherein the carriage has a displacement sensor thereon, the slider assembly further comprising:

16. The syringe pump of claim 15, wherein the displacement contactor comprises:

a contact fixing portion mounted on the slider body;

17. A syringe pump, comprising: