syringe pump

Abstract

The application discloses an injection pump, which comprises a pump body, a transmission mechanism arranged on the pump body and a push-pull box, wherein the push-pull box is connected with a driving end of the transmission mechanism; the push-pull box comprises an outer shell, a probe assembly, a pressure sensor assembly arranged in the outer shell, the pressure sensor assembly is arranged in stack with the probe assembly, a clamping jaw mechanism, the clamping jaw mechanism has two clamping jaws, each clamping jaw comprises a driving rod and a clamping part arranged outside the outer shell, the driving rod is arranged at one end of the clamping part and penetrates through the outer shell, a driving assembly arranged in the outer shell, the driving assembly comprises a motor circuit board, a motor arranged on the motor circuit board and a transmission assembly connecting the motor and the driving rod, the motor and the transmission assembly are arranged at one end of the motor circuit board, a mounting space is formed between a suspended part of the motor circuit board and the clamping part, and the stack combination of the probe assembly and the pressure sensor assembly is arranged in the mounting space. The injection pump effectively improves the compactness of the internal components of the push-pull box and reduces the overall volume of the push-pull box.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection pump equipment, in particular to an injection pump. BACKGROUND

[0002] The push-pull box of the injection pump plays a role of fixing the piston handle of the syringe and pushing the piston handle to move. Among them, the clamping jaw of the push-pull box is used to clamp and unlock the piston handle of the syringe, and the probe assembly and the pressure sensor of the push-pull box are used to detect whether the injection pump is installed with a syringe and to detect the pushing force of the piston handle.

[0003] Because the number of parts in the push-pull box is relatively large, and the internal layout is not compact enough, the structure volume of the push-pull box is relatively large.

[0004] Therefore, how to improve the structure compactness and reduce the volume of the push-pull box is a problem to be solved by the person skilled in the art. SUMMARY

[0005] Therefore, the present application provides an injection pump to improve the structure compactness and reduce the volume of the push-pull box.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] An injection pump, characterized in that it comprises a pump body, a transmission mechanism arranged on the pump body, and a push-pull box, wherein the push-pull box is connected with the driving end of the transmission mechanism.

[0008] The push-pull box comprises:

[0009] a housing;

[0010] a probe assembly;

[0011] a pressure sensor assembly arranged in the housing, wherein the pressure sensor assembly is arranged in stack with the probe assembly;

[0012] a clamping jaw mechanism, wherein the clamping jaw mechanism has two clamping jaws, the clamping jaw comprises a clamping portion outside the housing and a driving rod located at one end of the clamping portion and penetrating through the housing;

[0013] a driving assembly arranged in the housing, wherein the driving assembly comprises a motor circuit board, a motor arranged on the motor circuit board, and a transmission assembly connecting the motor and the driving rod; the motor and the transmission assembly are located at one end of the motor circuit board; a mounting space is formed between the overhanging portion of the motor circuit board and the clamping portion, and the stack combination of the probe assembly and the pressure sensor assembly is located in the mounting space.

[0014] The injection pump provided in this embodiment of the invention connects the motor and the drive rod via a transmission assembly. While achieving this connection, the transmission assembly, motor, and drive rod form a solid structure supported between the motor circuit board and the clamping part, with this solid structure located at one end of the motor circuit board. This allows the portion of the motor circuit board without the motor and transmission assembly to be suspended relative to the clamping part, i.e., a suspended portion of the motor circuit board. An installation space is formed between the suspended portion of the motor circuit board and the clamping part, within which the stacked probe assembly and pressure sensor assembly are located. Through this arrangement, the space between the motor circuit board and the clamping part is utilized efficiently, avoiding the probe assembly and pressure sensor assembly occupying additional space within the push-pull box, effectively improving the structural compactness of the internal components of the push-pull box and reducing its overall volume. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the injection pump in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the push-pull box in an embodiment of the present invention;

[0018] Figure 3 This is an exploded view of the push-pull box in an embodiment of the present invention;

[0019] Figure 4 This is a top view of the push-pull box in an embodiment of the present invention;

[0020] Figure 5 for Figure 4 A cross-sectional view along the BB plane.

[0021] Figure 6 for Figure 4 A cross-sectional view along the CC plane;

[0022] Figure 7 This is a side view of the push-pull box in an embodiment of the present invention;

[0023] Figure 8 for Figure 7 A cross-sectional view along the EE plane;

[0024] Figure 9 for Figure 7 A cross-sectional view along the FF plane;

[0025] Figure 10 The exploded structure diagram of the probe assembly in the embodiment of the present application;

[0026] Figure 11 The front view structure diagram of the probe assembly and the pressure sensor assembly in the embodiment of the present application;

[0027] Figure 12 The Figure 11 The section view along the A-A plane;

[0028] Figure 13 The exploded structure diagram of the probe assembly in the embodiment of the present application;

[0029] Figure 14 The exploded structure diagram of the probe assembly in the embodiment of the present application;

[0030] Figure 15 The exploded structure diagram of the probe assembly, the pressure sensor assembly, the clamp jaw mechanism and the driving assembly in the embodiment of the present application;

[0031] Figure 16 The front view structure diagram of the probe assembly, the pressure sensor assembly, the clamp jaw mechanism and the driving assembly in the embodiment of the present application;

[0032] Figure 17 The rear view structure diagram of the probe assembly, the pressure sensor assembly, the clamp jaw mechanism and the driving assembly in the embodiment of the present application;

[0033] Figure 18 The structure diagram of the shell cover in the embodiment of the present application;

[0034] Figure 19 The structure diagram of the shell cover in the embodiment of the present application;

[0035] Figure 20 The structure diagram of the shell cover in the embodiment of the present application;

[0036] Figure 21 The section view of the pressure sensor assembly in the embodiment of the present application. DETAILED DESCRIPTION

[0037] The present application discloses an injection pump to improve the compact structure and reduce the volume of the push-pull box.

[0038] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0039] Please refer to Figures 1-21 As shown in the drawings, the embodiment of the present application provides an injection pump, comprising a pump body 300, a transmission assembly arranged on the pump body 300, and a push-pull box 100 connected with a driving end 200 of the transmission mechanism; the push-pull box 100 comprises an outer shell, a probe assembly 11, a pressure sensor assembly 15, a clamping jaw mechanism, and a driving assembly. The pressure sensor assembly 15 is arranged in the outer shell, and the pressure sensor assembly 15 and the probe assembly 11 are arranged in a stack. The clamping jaw mechanism has two clamping jaws 10, each clamping jaw 10 comprises a driving rod and a clamping portion outside the outer shell, and the driving rod is located at one end of the clamping portion and penetrates through the outer shell. The driving assembly is arranged in the outer shell, and the driving assembly comprises 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 driving rod. The motor 5 and the transmission assembly are located at one end of the motor circuit board 2. An installation space is formed between the overhanging portion of the motor circuit board 2 and the clamping portion, and the stacked combination of the probe assembly 11 and the pressure sensor assembly 15 is located in the installation space.

[0040] The injection pump provided by the embodiment of the present application connects the motor 5 and the driving rod through the transmission assembly, realizes the connection, forms a solid structure supporting between the motor circuit board 2 and the clamping portion by the transmission assembly, the motor 5 and the driving rod, and the solid structure is located at one end of the motor circuit board 2. This makes the part of the motor circuit board 2 not provided with the motor 5 and the transmission assembly to be arranged in suspension relative to the clamping portion, i.e., the overhanging portion of the motor circuit board 2. An installation space is formed between the overhanging portion of the motor circuit board 2 and the clamping portion, and the stacked 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 portion is reasonably utilized, the probe assembly 11 and the pressure sensor assembly 15 do not occupy additional space in the push-pull box 100, the structural compactness of the internal components of the push-pull box 100 is effectively improved, and the overall volume of the push-pull box 100 is reduced.

[0041] In the embodiment, the shell comprises the shell body 12 and the shell cover 1; the clamping jaw mechanism, the probe assembly 11, the pressure sensor assembly 15 and the driving assembly are sequentially installed in the shell body 12, and the shell cover 1 is arranged on the shell body 12. In order to facilitate the assembly of the push-pull box 100. That is, the opening of the shell body 12 faces the shell cover 1, the clamping jaw mechanism, the probe assembly 11, the pressure sensor assembly 15 and the driving assembly are sequentially installed in the shell body 12 through the opening, and after the shell cover 1 is arranged on the shell body 12, the part of the clamping jaw mechanism, the pressure sensor assembly 15, the probe assembly 11 and the driving assembly closest to the shell cover 1 is the driving assembly. Among them, the shell body 12 and the shell cover 1 are preferably detachably connected, such as through screw connection or through buckle connection and the like.

[0042] The clamping jaw mechanism, the pressure sensor assembly 15, the probe assembly 11 and the driving assembly can also be assembled together outside the shell and then installed in the shell.

[0043] The push-pull box 100 comprises a support plate 3 arranged in the shell; the shell body 12 has a positioning support part for positioning and supporting the support plate 3; and the motor circuit board 2 is fixedly connected with the support plate 3. By arranging the support plate 3, the support plate 3 can cooperate with the positioning support part of the shell to complete the positioning and supporting of the positioning support part to the support plate 3, and then complete the positioning effect of the motor circuit board 2 in the shell. The motor circuit board 2 can also be positioned and supported by the positioning support part of the shell body 12, and the positioning effect can also be achieved.

[0044] In the embodiment, the support plate 3 can be a sheet metal support, or a support plate made of other materials, and can also be a control circuit board having control components corresponding to the probe assembly 11 and the pressure sensor assembly 15.

[0045] It can be understood that, for the purpose of convenient processing and improving the compactness of the structure, the support plate 3 is in a plate structure. In order to facilitate installation, the projection area of the support plate 3 covers the motor circuit board 2, so that the support plate 3 cooperates with the positioning part of the shell body 12.

[0046] Of course, the support plate 3 can also not be arranged, and the driving assembly can be directly fixed on the support of the pressure sensor assembly 15 or directly fixed on the inner wall of the shell.

[0047] In order to ensure the structural stability of the installation space and avoid the motor circuit board from pressing the probe assembly 11 and the pressure sensor assembly 15, the support plate 3 is located on the side of the motor circuit board 2 away from the shell cover 1; the support plate 3 has a hollow avoiding part for the motor 5 and the transmission assembly to pass through. That is, the support plate 3 can provide a support force for the motor circuit board 2 away from the clamping part, effectively support the motor circuit board 2 when the injection pump falls or other sudden impact, ensure the stability of the transmission assembly connecting the motor 5 and the driving rod, and also avoid the situation that the motor circuit board 2 presses the probe assembly 11 and the pressure sensor assembly 15 to cause damage to the parts.

[0048] The positioning support part is a stepped surface located on the inner wall of the shell 12, and the stepped surface is provided with a first concave-convex positioning structure; the outer edge of the support plate 3 is positioned and matched with the stepped surface, and the support plate 3 is provided with a second concave-convex positioning structure matched with the first concave-convex positioning structure. During installation, only the second concave-convex positioning structure of the support plate 3 needs to be aligned and installed with the first concave-convex positioning structure of the shell 12, so that the outer edge of the support plate 3 is positioned and matched with the stepped surface, thereby completing the installation of the driving assembly relative to the shell 12, and effectively simplifying the installation steps.

[0049] 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.

[0050] The clamping jaw mechanism further includes a transmission gear 8 for driving the relative movement of the two clamping jaws 10, and the transmission gear 8 is arranged at the end of the driving rod extending into the shell; the transmission assembly includes a driving gear 14 driven by the motor 5, and the transmission gear 8 is engaged with the driving gear 14; the driving gear 14 is rotated by the motor 5, and the transmission gear 8 is engaged with the driving gear 14, so that the transmission gear 8 is driven by the driving gear 14 to realize the relative movement operation of the two clamping jaws 10; when the two clamping jaws 10 move close to each other, the clamping jaw mechanism clamps the piston handle of the syringe; when the two clamping jaws 10 move away from each other, the clamping jaw mechanism separates the piston handle of the syringe.

[0051] For the convenience of installation, the axial direction of the transmission gear 8 and the driving gear 14 is arranged along the installation direction of the driving assembly to the shell 12, and the transmission gear 8 is engaged with the driving gear 14 when the driving assembly is installed in place relative to the shell 12. That is, when the driving assembly is installed into the shell 12, the driving gear 14 on the driving assembly is directly engaged with the transmission gear 8 of the clamping jaw mechanism which has been installed on the shell 12, thereby facilitating assembly.

[0052] In the first embodiment, the transmission gear 8 and the driving gear 14 are straight gears. With the above arrangement, the machining and assembly of the transmission gear 8 and the driving gear 14 are facilitated. When the driving assembly is installed, the transmission gear 8 and the driving gear 14 are axially parallel, and the transmission gear 8 and the driving gear 14 are close to each other, so that the straight teeth of the transmission gear 8 and the straight teeth of the driving gear 14 are directly inserted and matched, and the meshing of the straight teeth of the transmission gear 8 and the straight teeth of the driving gear 14 is completed. It can be understood that in the embodiment with the driven gear 7, the driven gear 7 is also a straight gear.

[0053] In the second embodiment, the transmission gear 8 and the driving gear 14 are bevel gears, and the large-diameter end of the driving gear 14 faces the motor circuit board 2. For the convenience of installation, it is preferred that the large-diameter end of the driving gear 14 faces the motor circuit board 2, so that when the driving assembly is installed in the shell 12, the small-diameter end of the driving gear 14 first coincides with the transmission gear 8 in the axial direction, facilitating the meshing connection of the transmission 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.

[0054] Further, the clamping jaw mechanism further comprises 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 the driven gear 7, and the driven gear 7 meshes with the transmission gear 8. In this embodiment, the transmission gear 8 is a 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 simultaneously to complete the operation of approaching and moving away from each other.

[0055] The transmission assembly further comprises a gear reduction box 13 arranged on the motor circuit board 2; the driving end of the motor 5 is connected to the input end of the gear reduction box 13, and the driving gear 14 is arranged at the output end of the gear reduction box 13. Through the transmission ratio of the gears in the gear reduction box 13, the speed of the driving gear 14 is adjusted, and the operation of the two clamping jaws 10 clamping and unlocking the piston handle of the syringe is controlled.

[0056] The push-pull box 100 further comprises 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 part; the angle sensor 4 is fixed relative to the motor circuit board 2; when the driving assembly is installed in place relative to the shell 12, the slot connection structure 6 and the angle sensor 4 are concave-convex matched. Through the above arrangement, the rotation angle of the clamping jaw 10 can be detected, so that the clamping state of the clamping jaw 10 to the piston handle of the syringe is obtained. The situation that the piston handle shakes due to the clamping not in place is avoided, and the service life of the motor driving device is also affected due to the clamping being too tight.

[0057] In this embodiment, the mating surface of the slot connection structure 6 and the angle sensor 4 is towards the motor circuit board 2. Further, when installing the drive assembly to the shell 12, the motor circuit board 2 of the drive assembly is matched with the positioning part of the shell 12, and the slot connection structure 6 is matched with the angle sensor 4, which facilitates the connection operation.

[0058] In this embodiment, 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.

[0059] The slot connection structure 6 is arranged on the jaw 10 provided with the driven gear 7. Through the above arrangement, the influence of transmission error is reduced, and the detection accuracy of the angle sensor 4 on the rotation angle of the jaw 10 is improved as much as possible.

[0060] In order to further improve the clamping stability, anti-skid structures are arranged on the opposite sides of the two jaws 10. The anti-skid structure can be a corrugated surface or other type of anti-skid surface, or an anti-skid pad or the like can be connected to the opposite sides of the two jaws 10 by means of adhesion or screw connection.

[0061] A sealing structure is arranged between the shell 12 and the shell cover 1. As shown in Figure 18 and Figure 19 The opening of the shell 12 has a stepped edge, the shell cover 1 has a plug-in structure extending into the stepped edge, and the sealing structure is a ring-shaped sealing ring 102 arranged on the outer side surface of the plug-in structure and the inner side surface of the stepped edge. The shell 12 and the shell cover 1 can also be in contact with each other, 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.

[0062] The jaw mechanism further comprises a transmission gear 8 for driving the relative movement of the two jaws 10, and the transmission gear 8 is arranged on the end portion of the drive rod extending into the shell. The transmission assembly comprises a drive gear 14 driven by the motor 5, and the transmission gear 8 is engaged with the drive gear 14. In the case of power failure of the motor 5, the drive gear 14 can be driven to rotate by external force. In special cases (such as the case of needing to remove the syringe urgently or power failure), since the drive gear 14 can be driven to rotate by external force in the case of power failure of the motor 5, the motor 5 does not affect the rotation of the drive gear 14, and the two jaws 10 can be manually pried open. In the process of prying open the two jaws 10, the transmission gear 8 rotates and drives the drive gear 14 to rotate. That is, the jaw 10 drives the transmission gear 8, the drive gear 14 and the motor 5 to rotate in reverse, and the transmission gear 8 and the drive gear 14 will not appear in the self-locking state. Through the above arrangement, the jaw mechanism can directly manually pry open the jaws 10 to complete the separation and unlocking operation of the piston handle of the syringe in special cases, which facilitates the operation and shortens the unlocking time; and there is no need to separately arrange an unlocking structure, which effectively reduces the volume of the push-pull box 100 and simplifies the structure of the injection pump.

[0063] In the embodiment, the driving shaft of the motor 5 can rotate under the external force in the power-off state of the motor 5. Through the above arrangement, the driving gear 14 can be driven to rotate by the external force without adding additional components, so as to directly manually separate the clamping jaw 10 to complete the separation and unlocking operation of the clamping jaw mechanism on the piston handle of the syringe in the special case. In the above case, the driving shaft of the motor 5 is directly connected with the driving gear 14 or connected through the solid connection structure.

[0064] The driving shaft of the motor 5 can be provided with a magnetic coupling or other connecting components between the driving shaft and the driving gear 14 to separate the driving shaft and the driving gear 14 after power-off. In the power-off state of the motor 5, the driving shaft of the motor 5 is separated from the driving gear 14, and the rotation of the driving gear 14 is not limited.

[0065] Further, the housing is provided with a mounting hole through which the driving rod passes; and the self-lubricating sleeve 9 is sleeved on the driving rod, and the outer wall of the self-lubricating sleeve 9 is in contact with the mounting hole. Through the self-lubricating sleeve 9, the rotation lubrication between the housing and the driving rod of the clamping jaw 10 is improved, so as to avoid the clamping jaw 10 being stuck and ensure the normal rotation of the clamping jaw 10.

[0066] In the embodiment, the self-lubricating sleeve 9 is relatively fixed with the mounting hole and rotates with the driving rod. In order to consider the installation stability, the self-lubricating sleeve 9 is relatively fixed with the mounting hole, so that the self-lubricating sleeve 9 is relatively fixed with the housing, and the self-lubricating sleeve 9 is prevented from stretching and contracting relative to the housing. Of course, the self-lubricating sleeve 9 can be relatively fixed with the driving rod and rotate with the mounting hole. Alternatively, the self-lubricating sleeve 9 rotates with the driving rod and the mounting hole.

[0067] Further, a sealing component is arranged between the one end of the self-lubricating sleeve 9 facing the clamping part and the clamping part. Figure 20 As shown in the figure, the sealing component is a sealing ring 901 sleeved on the driving rod, one surface of the self-lubricating sleeve 9 facing the clamping part is in contact with one surface of the sealing ring 901, and the other surface of the sealing ring 901 is in contact with the surface of the clamping part facing the self-lubricating sleeve 9.

[0068] Preferably, the self-lubricating sleeve 9 is made of POM or nylon. Other materials can also be used, as long as the relative sticking of the housing and the clamping jaw 10 caused by electrochemistry and oxidation corrosion is avoided.

[0069] As shown in the figure, Figure 11 , Figure 12 and Figure 13As shown in the figures, the probe assembly 11 comprises a pressing part 111 outside the shell, a mounting ring 112 fixed opposite to the shell, an elastic connecting part connecting the pressing part 111 and the mounting ring 112, and a pressing rod 114 fixed on the pressing part 111; the pressure sensor assembly 15 comprises a sensor bracket 151 fixedly connected with the mounting ring 112, and a pressure sensor 153 arranged on the sensor bracket 151; the sensor bracket 151 has a pressing channel corresponding to the pressure sensor 153 and through which the pressing rod 114 passes. 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 compactness of the structure of the probe assembly 11 and the pressure sensor assembly 15 is improved.

[0070] Further, the probe assembly 11 further comprises a guide rod 115 fixed on the pressing part 111, which is arranged in parallel with the pressing rod 114; the sensor bracket 151 has a guide channel telescopically fitted with the guide rod 115. Through the above arrangement, the relative rotation between the probe assembly 11 and the pressure sensor assembly 15 is prevented, and the stability is further improved.

[0071] In this embodiment, the pressing rod 114 is preferably 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 guide channel is a cylindrical hole. Through the above arrangement, the machining and installation operations are facilitated. The pressing rod 114 can also be arranged in a prism structure, and the pressing channel is a prism hole, which can also achieve the above effects.

[0072] As shown in the figures, Figure 6 , Figure 10 and Figure 13 , the probe assembly 11 further comprises a coupling baffle 113 fixedly arranged with the pressing part 111; the sensor bracket 151 has a baffle through hole 152 through which the blocking end of the coupling baffle 113 passes; the push-pull box further comprises a receiver for judging whether the pressing part 111 is subjected to an external force, and the blocking end of the coupling baffle 113 is arranged correspondingly with the receiver. It can be understood that when the blocking end of the coupling baffle 113 extends into the receiver, it is judged that the pressing part 111 is subjected to an external force.

[0073] Further, when the piston handle initially presses the pressing part 111, the blocking end of the coupling baffle 113 extends into the receiver, and the pressing rod 114 is not in contact with the pressure sensor 153. At this time, the injection pump receives the situation that the pressing part 111 is subjected to an external force, reduces the speed of the transmission mechanism driving the movement of the push-pull box 100, and makes the push-pull box 100 continue to move towards the piston handle of the syringe at a lower speed until the piston handle continues to press the pressing part 111 and makes the pressing rod 114 contact with 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.

[0074] Further, the pressure sensor 153 is arranged on the sensor support 151 in a floating manner. By arranging the pressure sensor 153 in a floating manner, the stress of the pressure sensor 153 caused by its own fixation is eliminated, and the detection accuracy is effectively improved.

[0075] As shown in Figure 21 , the pressure sensor 153 is installed on the sensor support 151 by means of the screw 15301; the head of the screw is arranged towards the locating surface of the pressure sensor 153, and the head of the screw has a floating gap with the cooperation surface of the pressure sensor 153 towards the head of the screw. By 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.

[0076] In order to prevent the pressure sensor 153 from rotating, two or more screws 15301 can be used to install the pressure sensor 153. The installation hole on the pressure sensor 153 can also be arranged as a square hole or other non-circular hole, and the screw 15301 has a cooperation structure arranged in the circumferential direction of the installation hole, which can also prevent the pressure sensor 153 from rotating.

[0077] A pressing plate can also be arranged on the side of the pressure sensor 153 away from the sensor support 151, and a gap exists between the pressing plate and the pressure sensor 153, which can also make the pressure sensor 153 arranged on the sensor support 151 in a floating manner.

[0078] In order to further improve the sealing effect, the outer shell has a probe through hole for the pressing part 111 to extend out of the outer shell, and the probe through hole has a soft rubber sealing structure with the probe assembly 11.

[0079] By the above arrangement, the liquid or dust from the outside is effectively prevented from entering the push-pull box 100, and the service life of the injection pump is improved.

[0080] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0081] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent 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 application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A syringe pump characterized by, The pump body, the transmission mechanism arranged on the pump body and the push-pull box are connected with the driving end of the transmission mechanism; The push-pull box comprises: a shell; a probe assembly; a pressure sensor assembly arranged in the shell, the pressure sensor assembly being arranged in stack with the probe assembly; a clamping jaw mechanism having two clamping jaws, the clamping jaw comprising a driving rod and a clamping portion outside the shell, the driving rod being located at one end of the clamping portion and penetrating the shell; a driving assembly arranged in the shell, the driving assembly comprising a motor circuit board, a motor arranged on the motor circuit board and a transmission assembly connecting the motor and the driving rod; the motor and the transmission assembly are located at one end of the motor circuit board; a mounting space is formed between the motor circuit board and the clamping portion, and the stack of the probe assembly and the pressure sensor assembly is located in the mounting space; the shell comprises a shell body and a shell cover; the push-pull box further comprises a support plate arranged in the shell; the shell body has a positioning support portion for positioning and supporting the support plate; the motor circuit board is fixedly connected with the support plate; the support plate is located on the side of the motor circuit board away from the shell cover; the support plate has a hollow avoiding portion for the motor and the transmission assembly to pass through; the probe assembly comprises a pressing portion outside the shell, a pressing rod fixed on the pressing portion and a coupling stopper fixedly arranged on the pressing portion; the push-pull box further comprises a receiver for determining whether the pressing portion is subjected to an external force, and a blocking end of the coupling stopper is arranged corresponding to the receiver; after the blocking end of the coupling stopper extends into the receiver, the speed of the push-pull box moving towards the piston handle of the syringe is reduced until the piston handle continues to press the pressing portion and makes the pressing rod contact the pressure sensor assembly.

2. The syringe pump of claim 1, wherein, The clamping jaw mechanism, the probe assembly, the pressure sensor assembly and the driving assembly are sequentially installed in the shell body, and the shell cover is arranged on the shell body.

3. The syringe pump of claim 1, wherein, The positioning support portion is a stepped surface on the inner wall of the shell body, and a first concave-convex positioning structure is arranged on the stepped surface; the outer edge of the support plate is positioned and matched with the stepped surface, and a second concave-convex positioning structure is arranged on the support plate and matched with the first concave-convex positioning structure.

4. The syringe pump of claim 3, wherein, The clamping jaw mechanism further comprises a transmission gear for driving the two clamping jaws to move relative to each other, and the transmission gear is arranged at the end of the driving rod penetrating into the shell; the transmission assembly comprises a driving gear driven by the motor, and the transmission gear is engaged with the driving gear; the axial direction of the transmission gear and the driving gear is arranged along the mounting direction of the driving assembly to the shell body, and the transmission gear is engaged with the driving gear when the driving assembly is mounted in place relative to the shell body.

5. The syringe pump of claim 4, wherein, The transmission gear and the driving gear are spur gears; alternatively, the transmission gear and the driving gear are bevel gears, and the large-diameter end of the driving gear faces the motor circuit board.

6. The syringe pump of claim 4, wherein, The clamping jaw mechanism further comprises a driven gear; One of the two said clamping jaws is provided with the transmission gear, the other of the two said clamping jaws is provided with the driven gear, and the driven gear is engaged with the transmission gear.

7. The syringe pump of claim 4, wherein, The transmission assembly further comprises a gear reduction box arranged on the motor circuit board. The driving end of the motor is connected with the input end of the gear reduction box, and the driving gear is arranged on the output end of the gear reduction box.

8. The syringe pump of claim 1, wherein, The push-pull box further comprises an angle sensor for detecting the rotation angle of the clamping jaw and a slot connecting structure arranged at one end of the driving rod away from the clamping part. The angle sensor is fixed relative to the motor circuit board. When the driving assembly is mounted in place relative to the shell, the slot connecting structure is in concave-convex cooperation with the angle sensor.

9. The syringe pump of claim 1, wherein, A sealing structure is arranged between the shell and the shell cover.

10. The syringe pump of claim 1, wherein, The clamping jaw mechanism further comprises a transmission gear for driving the relative movement of the two clamping jaws, and the transmission gear is arranged on the end of the driving rod extending into the shell. The transmission assembly comprises a driving gear driven by the motor, and the transmission gear is engaged with the driving gear. In the power-off state of the motor, the driving gear can be driven to rotate by external force.

11. The syringe pump of claim 10, wherein, In the power-off state of the motor, the driving shaft of the motor can be driven to rotate by external force.

12. The syringe pump of claim 1, wherein, The shell has a mounting hole through which the driving rod passes; 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.

13. The syringe pump of claim 12, wherein, The self-lubricating sleeve is fixed relative to the mounting hole, and the self-lubricating sleeve rotates in cooperation with the driving rod. A sealing member is arranged between one end of the self-lubricating sleeve towards the clamping part and the clamping part.

14. The syringe pump of claim 1, wherein, The probe assembly further comprises a mounting ring fixed relative to the shell and an elastic connecting part connecting the pressing part and the mounting ring. The pressure sensor assembly comprises a sensor support fixedly connected with the mounting ring and a pressure sensor arranged on the sensor support; the sensor support has a pressing channel corresponding to the pressure sensor and through which the pressing rod passes.

15. The syringe pump of claim 14, wherein, The probe assembly further comprises a guide rod fixed to the pressing part, and the guide rod is arranged in parallel with the pressing rod. The sensor support has a guide channel in telescopic cooperation with the guide rod.

16. The syringe pump of claim 14, wherein, The sensor support has a baffle through hole through which the blocking end of the coupling baffle passes.

17. The syringe pump of claim 14, wherein, The pressure sensor is arranged on the sensor support in a floating manner.

18. The syringe pump of claim 17, wherein, The pressure sensor is mounted on the sensor support by a screw; The head of the screw is towards the positioning surface of the pressure sensor, and the cooperation surface of the pressure sensor towards the head of the screw has a floating gap.

19. The syringe pump of claim 14, wherein, The shell has a probe through hole through which the pressing part extends out of the shell, and the probe through hole and the probe assembly have a soft rubber sealing structure.

Images