WO2021093327A1

WO2021093327A1 - Injection pump

Info

Publication number: WO2021093327A1
Application number: PCT/CN2020/096546
Authority: WO
Inventors: 刘华勇; 赵鹏仕; 伍鼎韡
Original assignee: 深圳迈瑞科技有限公司
Priority date: 2019-11-15
Filing date: 2020-06-17
Publication date: 2021-05-20
Also published as: CN112807524A

Abstract

An injection pump, comprising a pump body (300), a transmission mechanism arranged on the pump body (300), and a push-pull box (100), the push-pull box (100) being connected to a drive end (200) of the transmission mechanism; the push-pull box (100) comprises: an outer shell, a probe assembly (11); a pressure sensor assembly (15) arranged in the outer shell, the pressure sensor assembly (15) and the probe assembly (11) being in a stacked arrangement; a clamping jaw mechanism, the clamping jaw mechanism having two clamping jaws (10), each clamping jaw (10) comprising a drive rod and a clamping part positioned outside the outer shell, the drive rod being positioned at one end of the clamping part and penetrating the outer shell; and a drive assembly arranged in the outer shell, the drive assembly comprising a motor circuit board (2), a motor (5) arranged on the motor circuit board (2), and a transmission assembly connecting the motor (5) and the drive rod; the motor (5) and the transmission assembly are positioned at one end of the motor circuit board (2); an installation space is formed between a suspended part of the motor circuit board (2) and the clamping part, and the stack combination of the probe assembly (11) and the pressure sensor assembly (15) is positioned in the installation space. The present injection pump effectively increases the structural compactness of the internal components of the push-pull box (100), reducing the overall volume of the push-pull box (100).

Description

Injection pump

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201911120991.6, and the invention title is "Syringe Pump" on November 15, 2019, the entire content of which is incorporated into this application by reference.

Technical field

The present invention relates to the technical field of injection pump equipment, in particular to an injection pump.

Background technique

The push-pull box of the syringe pump plays the role of fixing the piston handle of the syringe and pushing the piston handle to move. Among them, the jaws of the push-pull box are used to clamp and unlock the piston handle of the syringe, and the probe assembly and pressure sensor of the push-pull box are used to detect whether the syringe is installed in the syringe pump and to detect the pushing force of the piston handle.

Due to the large number of parts in the push-pull box, and the internal layout is not compact enough, the structure of the push-pull box is relatively large.

Therefore, how to improve the compact structure and reduce the volume of the push-pull box is an urgent problem to be solved by those skilled in the art.

Summary of the invention

In view of this, the present invention provides a syringe pump to improve the compact structure and reduce the volume of the push-pull box.

In order to achieve the above objectives, the present invention provides the following technical solutions:

An injection pump, characterized in that it comprises a pump body, a transmission mechanism and a push-pull box arranged on the pump body, the push-pull box is connected with the driving end of the transmission mechanism;

The push-pull box includes:

shell;

Probe assembly;

A pressure sensor assembly arranged in the housing, the pressure sensor assembly and the probe assembly being stacked;

A clamping jaw mechanism, the clamping jaw mechanism has two clamping jaws, the clamping jaws include a driving rod and a clamping part located outside the housing, the driving rod is located at one end of the clamping part and penetrates the housing ；

A drive assembly arranged in the housing, the drive assembly including a motor circuit board, a motor arranged on the motor circuit board, and a transmission assembly connecting the motor and the drive rod; the motor and the transmission assembly It is located at one end of the motor circuit board; an installation space is formed between the suspended portion of the motor circuit board and the clamping portion, and the stacking combination of the probe assembly and the pressure sensor assembly is located in the installation space.

In the injection pump provided by the embodiment of the present invention, the motor and the drive rod are connected through a transmission assembly. While the connection is realized, the transmission assembly, the motor and the drive rod form a physical structure supported between the motor circuit board and the clamping part, and, The physical structure is located at one end of the motor circuit board. As a result, the part of the motor circuit board where the motor and transmission components are not provided is suspended relative to the clamping part, that is, the suspended part of the motor circuit board. An installation space is formed between the suspended part and the clamping part of the motor circuit board, and the stacking combination of the probe assembly and the pressure sensor assembly is located in the installation space. Through the above arrangement, the space between the motor circuit board and the clamping part is reasonably used, and the probe assembly and pressure sensor assembly are prevented from occupying extra space in the push-pull box, which effectively improves the compactness of the internal parts of the push-pull box and reduces The overall volume of the push-pull box.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work.

Figure 1 is a schematic structural diagram of a syringe pump in an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a push-pull box in an embodiment of the present invention;

Figure 3 is an exploded schematic diagram of the push-pull box in the embodiment of the present invention;

4 is a schematic top view of the push-pull box in the embodiment of the present invention;

Fig. 5 is a schematic cross-sectional view along the B-B plane in Fig. 4;

Fig. 6 is a schematic cross-sectional view taken along the C-C plane in Fig. 4;

Figure 7 is a schematic side view of the push-pull box in the embodiment of the present invention;

Fig. 8 is a schematic cross-sectional view taken along the E-E plane in Fig. 7;

Fig. 9 is a schematic cross-sectional view taken along the F-F plane in Fig. 7;

10 is a schematic diagram of the three-dimensional structure of the stacking assembly of the probe assembly and the pressure sensor assembly in an embodiment of the present invention;

11 is a schematic diagram of the front view of the stacked assembly of the probe assembly and the pressure sensor assembly in an embodiment of the present invention;

Fig. 12 is a schematic cross-sectional view taken along the A-A plane in Fig. 11;

Figure 13 is a schematic diagram of an exploded structure of the probe assembly in an embodiment of the present invention;

Figure 14 is a schematic diagram of the exploded structure of the gripper in the embodiment of the present invention;

15 is a schematic diagram of the three-dimensional structure of the probe assembly, the pressure sensor assembly, the clamping jaw mechanism, and the driving assembly in the embodiment of the present invention;

16 is a schematic front view of the structure of the probe assembly, the pressure sensor assembly, the clamping jaw mechanism, and the driving assembly in the embodiment of the present invention;

Figure 17 is a schematic rear view of the structure of the probe assembly, pressure sensor assembly, clamping jaw mechanism, and driving assembly in an embodiment of the present invention;

18 is a schematic diagram of the structure of the cover in the embodiment of the present invention;

19 is a schematic diagram of the structure of the housing in the embodiment of the present invention;

Figure 20 is a partial cross-sectional view of the push-pull box in the embodiment of the present invention;

Figure 21 is a cross-sectional view of a pressure sensor assembly in an embodiment of the present invention.

Detailed ways

The invention discloses an injection pump to improve the compact structure and reduce the volume of a push-pull box.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to Figures 1-21, an embodiment of the present invention provides a syringe pump, including a pump body 300, a transmission assembly arranged on the pump body 300 and a push-pull box 100, the push-pull box 100 and the drive end 200 of the transmission mechanism Connection; Push-pull box 100 includes: a housing, a probe assembly 11, a pressure sensor assembly 15, a clamping jaw mechanism and a drive assembly. The pressure sensor assembly 15 is arranged in the housing, and the pressure sensor assembly 15 and the probe assembly 11 are stacked and arranged; the clamping jaw mechanism has two clamping jaws 10, the clamping jaws 10 include a driving rod and a clamping part located outside the housing, and the driving rod is located in the clamping One end of the holding part penetrates the housing; the drive assembly is arranged in the housing, and the drive assembly includes a motor circuit board 2, a motor 5 arranged on the motor circuit board 2, and a transmission assembly connecting the motor 5 and the drive rod; the motor 5 and the transmission assembly are located in the motor One end of the circuit board 2; an installation space is formed between the suspended portion and the clamping portion of the motor circuit board 2, and the stacking combination of the probe assembly 11 and the pressure sensor assembly 15 is located in the installation space.

In the injection pump provided by the embodiment of the present invention, the motor 5 and the driving rod are connected through a transmission assembly. While the connection is realized, the transmission assembly, the motor 5 and the driving rod form a physical structure supported between the motor circuit board 2 and the clamping part. And, the physical structure is located at one end of the motor circuit board 2. This makes the part of the motor circuit board 2 where the motor 5 and the transmission components are not arranged to be suspended relative to the clamping part, that is, the suspended part of the motor circuit board 2. An installation space is formed between the suspended portion and the clamping portion of the motor circuit board 2, and the stacking combination of the probe assembly 11 and the pressure sensor assembly 15 is located in the installation space. Through the above arrangement, the space between the motor circuit board 2 and the clamping part is reasonably used, and the probe assembly 11 and the pressure sensor assembly 15 are prevented from occupying extra space in the push-pull box 100, which effectively improves the compact structure of the internal components of the push-pull box 100 This reduces the overall volume of the push-pull box 100.

In this embodiment, the housing includes a housing 12 and a housing cover 1; the clamping jaw mechanism, the pressure sensor assembly 15, the probe assembly 11 and the driving assembly are sequentially installed in the housing 12, and the housing cover 1 is covered on the housing 12. In order to facilitate the assembly of the push-pull box 100. That is, the opening of the housing 12 faces the housing cover 1, and the clamping jaw mechanism, the pressure sensor assembly 15, the probe assembly 11, and the drive assembly are sequentially installed in the housing 12 through the openings. After the housing cover 1 is covered on the housing 12, clamp Among the claw mechanism, the pressure sensor assembly 15, the probe assembly 11, and the drive assembly, the component closest to the housing cover 1 is the drive assembly. Among them, the housing 12 and the cover 1 are preferably detachably connected, for example, connected by screws or connected by snaps.

The claw mechanism, the pressure sensor assembly 15, the probe assembly 11, and the drive assembly can also be assembled in the housing outside the housing.

The push-pull box 100 includes a bracket plate 3 arranged in a housing; the housing 12 has a positioning support part that is positioned and supported with the bracket plate 3; the motor circuit board 2 is fixedly connected to the bracket plate 3. By providing the support plate 3, the support plate 3 can cooperate with the positioning support part of the housing to complete the positioning support of the support plate 3 by the positioning support part, thereby completing the positioning effect of the motor circuit board 2 in the housing. The motor circuit board 2 and the positioning support part of the housing 12 can also be positioned and supported, and the positioning effect can also be achieved.

In this embodiment, the support board 3 can be a sheet metal support, or a support board made of other materials, and can also be a control circuit board with control components corresponding to the probe assembly 11 and the pressure sensor assembly 15.

It can be understood that for the sake of ease of processing and improvement of the compactness of the structure, the support plate 3 has a plate-like structure. In order to facilitate installation, the projection area of the bracket board 3 covers the motor circuit board 2, so the bracket board 3 is matched with the positioning portion of the housing 12.

Of course, the support plate 3 may not be provided, and the drive assembly can be directly fixed on the support of the pressure sensor assembly 15 or directly fixed on the inner wall of the housing.

In order to ensure the structural stability of the installation space and prevent the motor circuit board from squeezing the probe assembly 11 and the pressure sensor assembly 15, the bracket plate 3 is located on the side of the motor circuit board 2 facing the cover 1; the bracket plate 3 has a power supply machine 5 and the hollow avoidance part through which the transmission component passes. That is, the support plate 3 can provide a supporting force away from the clamping part to the motor circuit board 2, and when the syringe pump is dropped or other sudden impacts, it effectively supports the motor circuit board 2 to ensure that the transmission assembly is connected to the motor 5 and The stability of the driving rod also avoids damage to the components caused by the motor circuit board 2 squeezing the probe assembly 11 and the pressure sensor assembly 15.

The positioning support portion is a stepped surface on the inner wall of the housing 12, and a first concave-convex positioning structure is provided on the stepped surface; the outer edge of the bracket plate 3 is positioned and matched with the stepped surface, and the bracket plate 3 is provided with a first concave-convex positioning structure The second concave-convex positioning structure. During the installation process, it is only necessary to align the second concave-convex positioning structure of the bracket plate 3 with the first concave-convex positioning structure of the housing 12 and install, so that the outer edge of the bracket plate 3 can be positioned and matched with the stepped surface to complete the drive assembly Compared with the installation of the housing 12, the installation steps are effectively simplified.

In this embodiment, the first concave-convex positioning structure provided on the stepped surface is a positioning protrusion, and the second concave-convex positioning structure provided on the support plate 3 is a positioning groove.

The clamping jaw mechanism also includes a transmission gear 8 that drives the two clamping jaws 10 to move relative to each other. The transmission gear 8 is arranged at the end of the drive rod extending into the housing; the transmission assembly includes a drive gear 14 driven by a motor 5, the transmission gear 8 and the drive Gear 14 meshes; the drive gear 14 is rotated by the motor 5, and the transmission gear 8 meshes with the drive gear 14. The transmission gear 8 is driven by the drive gear 14 to realize the relative movement operation of the two clamping jaws 10, when the two clamping jaws When 10 are close to each other, the clamping of the piston shank of the syringe by the clamping claw mechanism is completed; when the two clamping claws 10 are far away from each other, the separation of the piston shank of the syringe by the clamping claw mechanism is completed.

For the convenience of installation, the axial directions of the transmission gear 8 and the drive gear 14 are arranged along the installation direction of the drive assembly to the housing 12, and the drive gear 8 meshes with the drive gear 14 when the drive assembly is installed relative to the housing 12 in place. That is, when the drive assembly is installed in the housing 12, the drive gear 14 on the drive assembly and the transmission gear 8 of the clamping jaw mechanism already installed on the housing 12 directly mesh with each other, which facilitates assembly.

In the first embodiment, the transmission gear 8 and the drive gear 14 are spur gears. Through the above arrangement, the processing and assembly of the driving gear 8 and the driving gear 14 are facilitated. When the drive assembly is installed, the drive gear 8 and the drive gear 14 are axially parallel, and the drive gear 8 and the drive gear 14 are close to each other, so that the straight teeth of the drive gear 8 and the straight teeth of the drive gear 14 are directly inserted and matched to complete the transmission. The straight teeth of the gear 8 mesh with the straight teeth of the drive gear 14. It can be understood that in the embodiment with the driven gear 7, the driven gear 7 is also a spur gear.

In the second embodiment, the drive gear 8 and the drive gear 14 are bevel gears, and the large diameter end of the drive gear 14 faces the motor circuit board 2. For the convenience of installation, it is preferable that the large-diameter end of the drive gear 14 faces the motor circuit board 2, so that when the drive assembly is installed in the housing 12, the small-diameter end of the drive gear 14 is first in the axial direction with the drive gear 8 The upper coincidence facilitates the meshing connection of the driving gear 8 and the driving gear 14. It can be understood that in the embodiment with the driven gear 7, the driven gear 7 is also a bevel gear.

Further, the clamping jaw mechanism further includes a driven gear 7; one of the two clamping jaws 10 is provided with a transmission gear 8, and the other of the two clamping jaws 10 is provided with a driven gear 7, which is connected to the driven gear 7 The transmission gear 8 meshes. In this embodiment, the transmission gear 8 is the driving gear, which is driven to rotate by the driving gear 14, and the transmission gear 8 drives the driven gear 7 to rotate, so that the two clamping jaws 10 move at the same time to complete the operation of approaching and moving away from each other.

The transmission assembly also includes a gear reduction box 13 arranged on the motor circuit board 2; the drive end of the motor 5 is connected to the input end of the gear reduction box 13, and the drive gear 14 is arranged at the output end of the gear reduction box 13. Among them, by setting the transmission ratio of the gears in the gear reduction box 13, it is convenient to adjust the rotation speed of the driving gear 14 so as to control the operation of the two clamping jaws 10 to clamp and unlock the piston handle of the syringe.

The push-pull box 100 also includes an angle sensor 4 for detecting the rotation angle of the clamping jaw 10 and a slot connection structure 6 arranged at the end of the driving rod away from the clamping portion; the angle sensor 4 is relatively fixed to the motor circuit board 2; When the housing 12 is installed in place, the slot connection structure 6 and the angle sensor 4 are concave and convexly matched. Through the above arrangement, the rotation angle of the clamping jaw 10 can be detected, and the clamping state of the piston handle of the syringe by the clamping jaw 10 can be obtained. It avoids the situation that the piston handle is shaken due to improper clamping, and the service life of the motor drive device is prevented from being affected by the clamping transition.

In this embodiment, the concave-convex mating surface of the slot connection structure 6 and the angle sensor 4 faces the motor circuit board 2. Furthermore, when installing the drive assembly to the housing 12, the motor circuit board 2 of the drive assembly is matched with the positioning portion of the housing 12, and the slot connection structure 6 and the angle sensor 4 are concave-convex matched, which facilitates the connection operation.

Among them, the angle sensor 4 is preferably arranged on the support plate 3. Of course, it can also be arranged on the motor circuit board 2.

The slot connection structure 6 is located on the clamping jaw 10 provided with the driven gear 7. Through the above arrangement, the influence of transmission errors is reduced, and the detection accuracy of the rotation angle of the jaw 10 by the angle sensor 4 is improved as much as possible.

In order to further improve the clamping stability, an anti-skid structure is provided on the opposite sides of the two clamping jaws 10. The anti-skid structure can be a corrugated surface or other types of anti-skid surfaces, and components such as anti-skid pads can also be connected to the opposite sides of the two clamping jaws 10 by means of paste or screw connection.

A sealing structure is provided between the housing 12 and the housing cover 1. As shown in Figures 18 and 19, the opening of the housing 12 has a stepped edge, and the shell cover 1 has a plug-in structure that extends into the stepped edge. The sealing structure is arranged on the outer side of the plug-in structure and the inner side of the stepped edge.的环向封环102。 The ring to the sealing ring 102. The shell 12 can also be brought into contact with the end face of the shell cover 1, and the sealing structure is an end face sealing ring between the end face of the shell 12 and the end face of the shell cover 1.

The clamping jaw mechanism also includes a transmission gear 8 that drives the two clamping jaws 10 to move relative to each other. The transmission gear 8 is arranged at the end of the drive rod extending into the housing; the transmission assembly includes a drive gear 14 driven by a motor 5, the transmission gear 8 and the drive The gear 14 meshes; when the motor 5 is de-energized, the drive gear 14 can be driven by external force to rotate. In special circumstances (such as emergency removal of the syringe or power failure), because the motor 5 can drive the drive gear 14 to rotate by external force when the motor 5 is de-energized, the motor 5 does not affect the rotation of the drive gear 14 and can be directly opened manually When the two clamping jaws 10 are opened, the transmission gear 8 rotates and drives the driving gear 14 to rotate. That is, the clamping jaw 10 drives the transmission gear 8, the driving gear 14 and the motor 5 to rotate in the reverse direction, and the transmission gear 8 and the driving gear 14 will not be in a self-locking state. Through the above arrangement, the clamping jaw 10 can be directly manually opened in special circumstances to complete the separation and unlocking operation of the clamping jaw mechanism on the piston handle of the syringe, which is convenient for operation and shortens the unlocking time; and there is no need to separately set the unlocking structure, which effectively reduces The volume of the push-pull box 100 simplifies the structure of the syringe pump.

In this embodiment, when the motor 5 is de-energized, the drive shaft of the motor 5 can be driven by external force to rotate. With the above arrangement, without adding additional components, the driving gear 14 can be driven by external force to rotate, so that in special circumstances, the clamping jaw 10 can be manually opened to complete the separation and unlocking operation of the piston handle of the syringe by the clamping jaw mechanism. In the above case, the drive shaft of the motor 5 and the drive gear 14 may be directly connected or through a physical connection structure.

It is also possible to arrange a magnetic coupling between the drive shaft of the motor 5 and the drive gear 14 to separate the drive shaft from the drive gear 14 after the power is cut off. When the motor 5 is de-energized, the drive shaft of the motor 5 is connected to the drive The gear 14 is separated, and the rotation of the driving gear 14 is not restricted.

Further, the housing has a mounting hole for the drive rod to pass through; a self-lubricating sleeve 9 is sleeved on the drive rod, and the outer wall of the self-lubricating sleeve 9 is in contact with the mounting hole. By providing the self-lubricating sleeve 9, the degree of rotation lubrication between the housing and the driving rod of the clamping jaw 10 is improved, thereby avoiding the jamming of the clamping jaw 10 and ensuring the normal rotation of the clamping jaw 10.

In this embodiment, the self-lubricating sleeve 9 is relatively fixed to the mounting hole, and the self-lubricating sleeve 9 rotates in cooperation with the driving rod. In consideration of installation stability, the self-lubricating sleeve 9 is relatively fixed to the mounting hole, so that the self-lubricating sleeve 9 is relatively fixed to the housing, and the expansion and contraction of the self-lubricating sleeve 9 relative to the housing is avoided. Of course, it is also possible to make the self-lubricating sleeve 9 and the drive rod relatively fixed, and the self-lubricating sleeve 9 rotates in cooperation with the mounting hole. Or, the self-lubricating sleeve 9 rotates in cooperation with the driving rod and the mounting hole.

Further, a sealing member is provided between the end of the self-lubricating sleeve 9 facing the clamping portion and the clamping portion. As shown in Figure 20, the sealing component is a sealing ring 901 sleeved on the drive rod. One end of the self-lubricating sleeve 9 facing the clamping part contacts one surface of the sealing ring 901, and the other surface of the sealing ring 901 faces the clamping part. One side of the self-lubricating sleeve 9 is in contact.

Preferably, the self-lubricating sleeve 9 is made of POM or nylon. Other materials can also be used, and it is only necessary to avoid the relative jamming of the housing and the clamping jaw 10 due to electrochemical and oxidative corrosion.

As shown in Figures 11, 12, and 13, the probe assembly 11 includes a pressing portion 111 located outside the housing, a mounting ring 112 relatively fixed to the housing, an elastic connecting portion connecting the pressing portion 111 and the mounting ring 112, and a fixing portion fixed to the pressing portion 111 on the pressing rod 114; the pressure sensor assembly 15 includes a sensor bracket 151 fixedly connected to the mounting ring 112 and a pressure sensor 153 erected on the sensor bracket 151; the sensor bracket 151 is provided with the pressure sensor 153 corresponding to the pressure sensor 153 and for the pressing rod 114 Pressing channel through. Through the above arrangement, the contact between the pressing rod 114 of the probe assembly 11 and the pressure sensor 153 is ensured, and the structure of the probe assembly 11 and the pressure sensor assembly 15 is improved.

Further, the probe assembly 11 further includes a guide rod 115 fixed on the pressing portion 111, the guide rod 115 and the pressing rod 114 are arranged in parallel; the sensor bracket 151 has a guide channel that is telescopically matched with the guide rod 115. Through the above arrangement, the relative rotation of the probe assembly 11 and the pressure sensor assembly 15 is prevented, and the stability is further improved.

In this embodiment, it is preferable that the pressing rod 114 is arranged in a cylindrical structure, and the pressing channel is a cylindrical hole; and the guide rod 115 is also arranged in a cylindrical structure, and the guiding channel is a cylindrical hole. Through the above settings, processing and installation operations are facilitated. It is also possible to configure the pressing rod 114 as a prismatic structure, and the pressing channel as a prismatic hole, which can also achieve the above-mentioned effects.

As shown in FIG. 6, FIG. 10 and FIG. 13, the probe assembly 11 further includes a coupling block 113 fixedly arranged with the pressing portion 111; the sensor bracket 151 has a block through hole 152 through which the blocking end of the coupling block 113 passes. The push-pull box also includes a receiver for determining whether the pressing portion 111 receives an external force, and the blocking end of the coupling baffle 113 is set corresponding to the receiver. It can be understood that after the blocking end of the coupling baffle 113 extends into the receiver, it is determined that the pressing portion 111 is subjected to an external force.

In addition, when the piston handle initially presses the pressing portion 111, after the blocking end of the coupling flap 113 extends into the receiver, the pressing rod 114 does not contact the pressure sensor 153. At this time, the syringe pump receives the external force on the pressing portion 111 , Reducing the speed at which the transmission mechanism drives the push-pull box 100 to move, so that the push-pull box 100 continues to move toward the plunger handle of the syringe at a lower speed until the plunger handle continues to press the pressing portion 111 and makes the pressing rod 114 contact the pressure sensor 153. Through the above arrangement, the impact force of the contact between the pressing rod 114 and the pressure sensor 153 is effectively reduced.

Furthermore, the pressure sensor 153 can be floatingly arranged on the sensor bracket 151. By adopting the floating pressure sensor 153 setting structure, the pressure sensor 153 is fixed to eliminate its own stress, which effectively improves the detection accuracy.

As shown in FIG. 21, the pressure sensor 153 is installed on the sensor bracket 151 through a screw 15301; there is a floating gap between the positioning surface of the screw head facing the pressure sensor 153 and the mating surface of the pressure sensor 153 facing the screw head. Through the above arrangement, the pressure sensor 153 can float along the axial direction of the screw 15301, and the installation of the pressure sensor 153 is completed.

In order to prevent the pressure sensor 153 from rotating, more than two screws 15301 may be used to install the pressure sensor 153. The mounting hole on the pressure sensor 153 can also be set as a square hole or other non-circular holes. The screw 15301 has a circumferential location matching structure with the mounting hole, which can also prevent the pressure sensor 153 from rotating.

A pressure plate can also be provided on the side of the pressure sensor 153 away from the sensor support 151, and there is a gap between the pressure sensor 153 and the pressure sensor 153, and the pressure sensor 153 can also be floated on the sensor support 151.

In order to further improve the sealing effect, the housing has a probe through hole through which the pressing portion 111 extends out of the housing, and a soft rubber sealing structure is provided between the probe through hole and the probe assembly 11.

Through the above arrangement, external liquid or dust is effectively prevented from entering the push-pull box 100, and the service life of the syringe pump is improved.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

An injection pump, characterized in that it comprises a pump body, a transmission mechanism and a push-pull box arranged on the pump body, the push-pull box is connected with the driving end of the transmission mechanism;

The push-pull box includes:

shell;

Probe assembly;

A pressure sensor assembly arranged in the housing, the pressure sensor assembly and the probe assembly being stacked;

A clamping jaw mechanism, the clamping jaw mechanism has two clamping jaws, the clamping jaws include a driving rod and a clamping part located outside the housing, the driving rod is located at one end of the clamping part and penetrates the housing ；

A drive assembly arranged in the housing, the drive assembly including a motor circuit board, a motor arranged on the motor circuit board, and a transmission assembly connecting the motor and the drive rod; the motor and the transmission assembly It is located at one end of the motor circuit board; an installation space is formed between the suspended portion of the motor circuit board and the clamping portion, and the stacking combination of the probe assembly and the pressure sensor assembly is located in the installation space.
The syringe pump according to claim 1, wherein the housing includes a housing and a cover;

The clamping jaw mechanism, the pressure sensor assembly, the probe assembly, and the drive assembly are sequentially installed in the housing, and the housing cover is arranged on the housing.
3. The syringe pump according to claim 2, wherein the push-pull box further comprises a bracket plate arranged in the housing;

The housing has a positioning support part that is positioned and supported with the support plate;

The motor circuit board is fixedly connected with the support board.
The syringe pump of claim 3, wherein the support plate is located on a side of the motor circuit board facing away from the housing cover;

The support plate is provided with a hollow avoiding part for the motor and the transmission component to pass through.
The syringe pump according to claim 3, wherein the positioning support portion is a stepped surface located on the inner wall of the housing, and a first concave-convex positioning structure is provided on the stepped surface;

The outer edge of the support plate is positioned and matched with the stepped surface, and the support plate is provided with a second concave-convex positioning structure that is matched with the first concave-convex positioning structure.
The syringe pump according to claim 5, wherein the clamping jaw mechanism further comprises a transmission gear that drives the two clamping jaws to move relative to each other, and the transmission gear is arranged on the drive rod extending into the housing The end of

The transmission assembly includes a driving gear driven by the motor, and the transmission gear meshes with the driving gear;

The axial directions of the transmission gear and the drive gear are arranged along the installation direction of the drive assembly to the housing, and the drive gear meshes with the drive gear when the drive assembly is installed in place relative to the housing .
The syringe pump of claim 6, wherein the transmission gear and the drive gear are spur gears;

Or, for the drive gear and the drive gear bevel gear, the large diameter end of the drive gear faces the motor circuit board.
8. The syringe pump of claim 6, wherein the clamping jaw mechanism further comprises a driven gear;

One of the two clamping jaws is provided with the transmission gear, and the other of the two clamping jaws is provided with the driven gear, and the driven gear meshes with the transmission gear.
7. The syringe pump of claim 6, wherein the transmission assembly further comprises a gear reduction box arranged on the motor circuit board;

The drive end of the motor is connected with the input end of the gear reduction box, and the drive gear is arranged at the output end of the gear reduction box.
The syringe pump according to claim 2, wherein the push-pull box further comprises an angle sensor for detecting the rotation angle of the jaws and a slot provided at an end of the driving rod away from the clamping portion Connection structure

The angle sensor and the motor circuit board are relatively fixed;

When the drive assembly is installed in place with respect to the housing, the slot connection structure and the angle sensor are concave-convex matched.
The syringe pump according to claim 2, wherein a sealing structure is provided between the casing and the casing cover.
The injection pump according to claim 1, wherein the clamping jaw mechanism further comprises a transmission gear that drives the two clamping jaws to move relative to each other, and the transmission gear is arranged on the drive rod extending into the housing The end of

The transmission assembly includes a driving gear driven by the motor, and the transmission gear meshes with the driving gear;

When the motor is de-energized, the drive gear can be driven by external force to rotate.
The injection pump according to claim 12, wherein when the motor is de-energized, the drive shaft of the motor can rotate under the driving of an external force.
The syringe pump according to claim 1, wherein the housing has a mounting hole for the drive rod to pass through;

A self-lubricating sleeve is sleeved on the driving rod, and the outer wall of the self-lubricating sleeve is in contact with the mounting hole.
The injection pump according to claim 14, wherein the self-lubricating sleeve is relatively fixed to the mounting hole, and the self-lubricating sleeve rotates in cooperation with the drive rod;

A sealing member is provided between the end of the self-lubricating sleeve facing the clamping portion and the clamping portion.
The syringe pump according to claim 1, wherein the probe assembly includes a pressing portion located outside the housing, a mounting ring relatively fixed to the housing, and an elastic connection between the pressing portion and the mounting ring. A connecting part and a pressing rod fixed on the pressing part;

The pressure sensor assembly includes a sensor bracket fixedly connected to the mounting ring and a pressure sensor erected on the sensor bracket; the sensor bracket is provided with a pressure sensor corresponding to the pressure sensor and for the pressing rod to pass through. Press the channel.
The syringe pump according to claim 16, wherein the probe assembly further comprises a guide rod fixed on the pressing part, and the guide rod is arranged in parallel with the pressing rod;

The sensor bracket is provided with a guide channel telescopically matched with the guide rod.
The syringe pump according to claim 16, wherein the probe assembly further comprises a coupling baffle fixedly arranged with the pressing part;

The sensor bracket has a baffle through hole through which the blocking end of the coupling baffle passes;

The push-pull box also includes a receiver for judging whether the pressing part is subjected to external force, and the blocking end of the coupling baffle is arranged corresponding to the receiver.
16. The syringe pump according to claim 16, wherein the pressure sensor is floatably arranged on the sensor bracket.
The syringe pump of claim 19, wherein the pressure sensor is mounted on the sensor bracket by a screw;

There is a floating gap between the positioning surface of the head of the screw facing the pressure sensor and the mating surface of the pressure sensor facing the head of the screw.
The syringe pump according to claim 16, wherein the housing has a probe through hole for the pressing part to extend out of the housing, and there is a soft glue between the probe through hole and the probe assembly. Sealed structure.