Injection pump

Abstract

The injection pump comprises a pump body, a transmission mechanism and a push-pull box, the push-pull box comprises a shell, a probe assembly, a pressure sensor assembly, a clamping jaw mechanism and a driving assembly, and the pressure sensor assembly and the probe assembly are arranged in a stacked mode; the clamping jaw mechanism is provided with two clamping jaws, each clamping jaw comprises a driving rod and a clamping part located outside the shell, and each driving rod is located at one end of the corresponding clamping part and penetrates through the shell; in the driving assembly, a mounting space is formed between the motor circuit board and the clamping part, and the stacked combination 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 is provided with a positioning and supporting part which is positioned and supported with the bracket plate; the motor circuit board is fixedly connected with the bracket plate; the bracket plate is positioned on one surface of the motor circuit board back to the shell cover; the support plate is provided with a hollowed-out avoiding part used for allowing the motor and the transmission assembly to penetrate through. According to the injection pump, the structural compactness is improved, and the overall size is reduced.

Description

[0001] This application is a divisional application of the invention with the application date of November 15, 2019, the invention name of "Injection Pump", and the application number of 201911120991.6. Technical Field

[0002] The present invention relates to the technical field of injection pump equipment, and particularly relates to an injection pump. Background Art

[0003] The push-pull box of an injection pump plays a role in fixing the piston rod of a syringe and pushing the piston rod to move. Among them, the jaws of the push-pull box are used for clamping and unlocking the piston rod of the syringe, and the probe assembly and pressure sensor of the push-pull box are used for detecting whether a syringe is installed in the injection pump and for detecting the driving force on the piston rod, etc.

[0004] Since there are a large number of components inside the push-pull box and the internal layout is not compact enough, the structural volume of the push-pull box is relatively large.

[0005] Therefore, how to improve the structural compactness 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

[0006] In view of this, the present invention provides an injection pump to improve the structural compactness and reduce the volume of the push-pull box.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An injection pump includes a pump body, a transmission mechanism arranged on the pump body, and a push-pull box, and the push-pull box is connected to the driving end of the transmission mechanism;

[0009] The push-pull box includes:

[0010] A housing;

[0011] A probe assembly;

[0012] A pressure sensor assembly arranged inside the housing, and the pressure sensor assembly is stacked with the probe assembly;

[0013] A jaw mechanism having two jaws, and each jaw includes a driving rod and a clamping portion located outside the housing, and the driving rod is located at one end of the clamping portion and penetrates through the housing;

[0014] A driving assembly arranged inside the housing, and the driving assembly includes a motor circuit board, a motor arranged on the motor circuit board, and a transmission assembly connecting the motor and the driving rod; an installation space is formed between the motor circuit board and the clamping portion, and the stacked combination of the probe assembly and the pressure sensor assembly is located in the installation space;

[0015] The outer shell includes a housing and a cover;

[0016] The push-pull box further includes a support plate disposed within the outer shell; the housing has a positioning and supporting portion for positioning and supporting the support plate; the motor circuit board is fixedly connected to the support plate;

[0017] The support plate is located on a side of the motor circuit board facing away from the cover;

[0018] The support plate has a hollowed-out avoidance portion for the motor and the transmission assembly to pass through.

[0019] The syringe pump provided by the embodiment of the present invention connects the motor and the drive rod through a transmission assembly. While achieving the connection, the transmission assembly, the motor, and the drive rod form a solid structure supported between the motor circuit board and the clamping portion. This makes the portion of the motor circuit board where the motor and the transmission assembly are not provided to be suspended relative to the clamping portion, that is, the suspended portion of the motor circuit board. An installation space is formed between the suspended portion of the motor circuit board and the clamping portion. The stacked combination of the probe assembly and the pressure sensor assembly is located within the installation space. Through the above arrangement, the space between the motor circuit board and the clamping portion is reasonably utilized, avoiding the probe assembly and the pressure sensor assembly from occupying additional space within the push-pull box, effectively improving the structural compactness of the internal components of the push-pull box, and reducing the overall volume of the push-pull box. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use 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, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of the syringe pump in the embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of the push-pull box in the embodiment of the present invention;

[0023] Figure 3 is an exploded schematic diagram of the push-pull box in the embodiment of the present invention;

[0024] Figure 4 is a top view schematic diagram of the push-pull box in the embodiment of the present invention;

[0025] Figure 5 is Figure 4 a sectional view along the B-B plane in

[0026] Figure 6 is Figure 4 the sectional view along the C-C plane in

[0027] Figure 7 the side view schematic diagram of the push-pull box in the embodiment of the present invention;

[0028] Figure 8 is Figure 7 the sectional view along the E-E plane in

[0029] Figure 9 is Figure 7 the sectional view along the F-F plane in

[0030] Figure 10 the three-dimensional structure schematic diagram of the stacked combination of the probe assembly and the pressure sensor assembly in the embodiment of the present invention;

[0031] Figure 11 the front view structure schematic diagram of the stacked combination of the probe assembly and the pressure sensor assembly in the embodiment of the present invention;

[0032] Figure 12 is Figure 11 the sectional view along the A-A plane in

[0033] Figure 13 the exploded structure schematic diagram of the probe assembly in the embodiment of the present invention;

[0034] Figure 14 the exploded structure schematic diagram of the jaw in the embodiment of the present invention;

[0035] Figure 15 the three-dimensional structure schematic diagram of the probe assembly, the pressure sensor assembly, the jaw mechanism and the driving assembly in the embodiment of the present invention;

[0036] Figure 16 the front view structure schematic diagram of the probe assembly, the pressure sensor assembly, the jaw mechanism and the driving assembly in the embodiment of the present invention;

[0037] Figure 17 the rear view structure schematic diagram of the probe assembly, the pressure sensor assembly, the jaw mechanism and the driving assembly in the embodiment of the present invention;

[0038] Figure 18 the structure schematic diagram of the shell cover in the embodiment of the present invention;

[0039] Figure 19 the structure schematic diagram of the housing in the embodiment of the present invention;

[0040] Figure 20 the partial sectional view of the push-pull box in the embodiment of the present invention;

[0041] Figure 21 A cross-sectional view of the pressure sensor assembly in the embodiment of the present invention. Detailed implementation manners

[0042] The present invention discloses an injection pump to improve the structural compactness and reduce the volume of the push-pull box.

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Please refer to Figures 1 - 21 As shown, the embodiment of the present invention provides an injection pump, including a pump body 300, a transmission assembly disposed on the pump body 300, and a push-pull box 100. The push-pull box 100 is connected to the driving end 200 of the transmission mechanism; the push-pull box 100 includes: a housing, a probe assembly 11, a pressure sensor assembly 15, a jaw mechanism, and a driving assembly. The pressure sensor assembly 15 is disposed inside the housing, and the pressure sensor assembly 15 and the probe assembly 11 are stacked; the jaw mechanism has two jaws 10, and each jaw 10 includes a driving rod and a clamping portion located outside the housing. The driving rod is located at one end of the clamping portion and penetrates the housing; the driving assembly is disposed inside the housing, and the driving assembly includes a motor circuit board 2, a motor 5 disposed 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; the probe assembly 11 and the pressure sensor assembly 15 are disposed between the motor circuit board 2 and the clamping portion.

[0045] In the injection pump provided by the embodiment of the present invention, the transmission assembly connects the motor 5 and the driving rod. While achieving the connection, the transmission assembly, the motor 5, and the driving rod form a solid structure supported between the motor circuit board 2 and the clamping portion, and this solid structure is located at one end of the motor circuit board 2. An installation space is formed between the suspended 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 settings, the space between the motor circuit board 2 and the clamping portion is reasonably utilized, avoiding the probe assembly 11 and the pressure sensor assembly 15 occupying additional space inside the push-pull box 100, effectively improving the structural compactness of the internal components of the push-pull box 100 and reducing the overall volume of the push-pull box 100.

[0046] The part of the motor circuit board 2 where the motor 5 and the transmission assembly are not provided is suspended relative to the clamping portion, that is, the suspended portion of the motor circuit board 2. An installation space is formed among the suspended portion of the motor circuit board 2, the motor 5, 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.

[0047] In this embodiment, the outer shell includes a housing 12 and a cover 1. The jaw mechanism, the probe assembly 11, the pressure sensor assembly 15, and the drive assembly are sequentially installed in the housing 12, and the cover 1 is covered on the housing 12 to facilitate the assembly of the push-pull box 100. That is, the opening of the housing 12 faces the cover 1. After the jaw mechanism, the probe assembly 11, the pressure sensor assembly 15, and the drive assembly are sequentially installed in the housing 12 through the opening and the cover 1 is covered on the housing 12, the component closest to the cover 1 among the jaw mechanism, the pressure sensor assembly 15, the probe assembly 11, and the drive assembly is the drive assembly. Among them, the housing 12 and the cover 1 are preferably detachably connected, such as by screw connection or by snap connection, etc.

[0048] Alternatively, after the jaw mechanism, the pressure sensor assembly 15, the probe assembly 11, and the drive assembly are assembled outside the outer shell, they can be installed in the outer shell together.

[0049] The push-pull box 100 includes a support plate 3 disposed in the outer shell. The housing 12 has a positioning support portion for positioning and supporting the support plate 3. The motor circuit board 2 is fixedly connected to the support plate 3. By providing the support plate 3, the support plate 3 can cooperate with the positioning support portion of the outer shell to complete the positioning and support of the support plate 3 by the positioning support portion, and further complete the positioning effect of the motor circuit board 2 in the outer shell. Alternatively, the motor circuit board 2 can be positioned and supported by the positioning support portion of the housing 12, and the positioning effect can also be achieved.

[0050] In this 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.

[0051] It can be understood that, for the convenience of processing and improving the structural compactness, the support plate 3 is a plate-like structure. For the convenience of installation, the projected area of the support plate 3 covers the motor circuit board 2. Therefore, the support plate 3 cooperates with the positioning portion of the housing 12.

[0052] Of course, the support plate 3 can also be not provided. The drive assembly can be directly fixed on the support of the pressure sensor assembly 15, or can be directly fixed on the inner wall of the outer shell.

[0053] 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 support plate 3 is located on the side of the motor circuit board 2 facing away from the shell cover 1; the support plate 3 has a hollow avoidance portion for the motor 5 and the transmission assembly to pass through. That is, the support plate 3 can provide a supporting force away from the clamping portion for the motor circuit board 2, effectively supporting the motor circuit board 2 when the syringe pump drops or is subjected to other sudden impacts, ensuring the stability of the connection between the transmission assembly and the drive rod, and also avoiding the situation where the motor circuit board 2 squeezes the probe assembly 11 and the pressure sensor assembly 15, resulting in component damage.

[0054] The positioning support portion is a stepped surface located 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 support plate 3 is in positioning cooperation with the stepped surface, and the support plate 3 has a second concave-convex positioning structure that cooperates with the first concave-convex positioning structure. During the installation process, only by aligning and installing the second concave-convex positioning structure of the support plate 3 with the first concave-convex positioning structure of the housing 12 can the outer edge of the support plate 3 be in positioning cooperation with the stepped surface, thus completing the installation of the drive assembly relative to the housing 12, effectively simplifying the installation steps.

[0055] 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.

[0056] The jaw mechanism further includes a transmission gear 8 that drives the two 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 the motor 5, and the transmission gear 8 meshes with the drive gear 14; by rotating the drive gear 14 through the motor 5, and since the transmission gear 8 meshes with the drive gear 14, the transmission gear 8 drives the two jaws 10 to move relative to each other. When the two jaws 10 approach each other, the jaw mechanism clamps the piston rod of the syringe; when the two jaws 10 move away from each other, the jaw mechanism separates the piston rod of the syringe.

[0057] 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 towards the housing 12, and the transmission gear 8 meshes with the drive gear 14 when the drive assembly is installed in place relative to the housing 12. That is, when installing the drive assembly into the housing 12, the drive gear 14 on the drive assembly directly meshes with the transmission gear 8 of the jaw mechanism already installed on the housing 12, facilitating the assembly.

[0058] In the first embodiment, the transmission gear 8 and the driving gear 14 are spur gears. With the above arrangement, it is convenient for the machining and assembly of the transmission gear 8 and the driving gear 14. When installing the driving assembly, the axial directions of the transmission gear 8 and the driving gear 14 are 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, completing the meshing of the straight teeth of the transmission gear 8 and the straight teeth of the driving gear 14. It can be understood that in the embodiment with the driven gear 7, the driven gear 7 is also a spur gear.

[0059] 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 preferably to orient the large-diameter end of the driving gear 14 towards the motor circuit board 2, so that when the driving assembly is installed in the housing 12, the small-diameter end of the driving gear 14 first coincides with the transmission gear 8 axially, 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.

[0060] Furthermore, the jaw mechanism further includes a driven gear 7; a transmission gear 8 is provided on one of the two jaws 10, and a driven gear 7 is provided on the other of the two jaws 10, and the driven gear 7 meshes with the transmission gear 8. 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 jaws 10 move simultaneously to complete the operations of approaching and separating from each other.

[0061] The transmission assembly further includes a gear reduction box 13 provided 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 provided 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, and further control the operations of the two jaws 10 for clamping and unlocking the piston handle of the syringe.

[0062] The push-pull box 100 further includes an angle sensor 4 for detecting the rotation angle of the jaw 10 and a slot connection structure 6 provided at one 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 driving assembly is installed in place relative to the housing 12, the slot connection structure 6 and the angle sensor 4 are in concave-convex fit. With the above arrangement, the rotation angle of the jaw 10 can be detected, so as to obtain the clamping state of the jaw 10 on the piston handle of the syringe. It can avoid the situation of the piston handle shaking due to insufficient clamping, and also avoid affecting the service life of the motor driving device due to excessive clamping.

[0063] In this embodiment, the mating surface of the slot connection structure 6 and the angle sensor 4, where the concave and convex parts meet, faces the motor circuit board 2. Furthermore, when the drive assembly is mounted on the housing 12, the motor circuit board 2 of the drive assembly mates with the positioning portion of the housing 12, while the slot connection structure 6 and the angle sensor 4 mate in a concave and convex manner, facilitating the connection operation.

[0064] The angle sensor 4 is preferably arranged on the bracket plate 3. Of course, it can also be arranged on the motor circuit board 2.

[0065] 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 the transmission error is reduced and the detection accuracy of the rotation angle of the clamping jaw 10 by the angle sensor 4 is improved as much as possible.

[0066] In order to further improve the clamping stability, anti-skid structures are provided on the opposite sides of the two clamping jaws 10. The anti-skid structures can be corrugated surfaces or other types of anti-skid surfaces, or components such as anti-skid pads can be attached to the opposite sides of the two clamping jaws 10 by gluing or screwing.

[0067] A sealing structure is provided between the housing 12 and the housing cover 1. Figure 18 and Figure 19 As shown, the opening of the housing 12 has a stepped edge, and the housing cover 1 has a plug-in structure that extends into the stepped edge. The sealing structure is an annular sealing ring 102 provided between the outer side of the plug-in structure and the inner side of the stepped edge. Alternatively, the housing 12 and the housing cover 1 can be in contact with each other at their end faces, with the sealing structure being an end-face sealing ring between the end faces of the housing 12 and the end faces of the housing cover 1.

[0068] The clamping mechanism also includes a transmission gear 8 that drives the two clamping jaws 10 in relative motion. The transmission gear 8 is disposed at the end of the drive rod extending into the housing. The transmission assembly includes a drive gear 14 driven by the motor 5, and the transmission gear 8 meshes with the drive gear 14. When the motor 5 loses power, the drive gear 14 can be rotated by an external force. In special circumstances (such as when a syringe needs to be removed urgently or during a power outage), since the drive gear 14 can be driven to rotate by an external force when the motor 5 loses power, the motor 5 does not affect the rotation of the drive gear 14, and the two clamping jaws 10 can be manually opened. During the process of opening the two clamping jaws 10, the transmission gear 8 rotates and drives the drive gear 14 to rotate. That is, the clamping jaws 10 reversely drive the transmission gear 8, the drive gear 14, and the motor 5 to rotate, and the transmission gear 8 and the drive gear 14 will not enter a self-locking state. Through the above-mentioned arrangement, the clamping jaws 10 can be 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 set up a separate unlocking structure, which effectively reduces the volume of the push-pull box 100 and simplifies the structure of the injection pump.

[0069] In this embodiment, when the motor 5 is powered off, the drive shaft of the motor 5 can be rotated by an external force. Through the above arrangement, without adding extra components, the drive gear 14 can be rotated by an external force, so as to directly manually separate the jaws 10 to complete the separation and unlocking operation of the piston handle of the syringe by the jaw mechanism in special cases. In the above situation, the drive shaft of the motor 5 can be directly connected to the drive gear 14 or through a solid connection structure.

[0070] Alternatively, a connecting component such as a magnetic coupling can be provided between the drive shaft of the motor 5 and the drive gear 14 to separate the drive shaft and the drive gear 14 after power-off. When the motor 5 is powered off, the drive shaft of the motor 5 is separated from the drive gear 14, and the rotation of the drive gear 14 is not restricted.

[0071] Furthermore, 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 contacts the mounting hole. By providing the self-lubricating sleeve 9, the rotational lubricity between the housing and the drive rod of the jaws 10 is improved, thereby avoiding the situation where the jaws 10 are stuck and ensuring the normal rotation of the jaws 10.

[0072] 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 drive rod. For the 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, avoiding the telescoping of the self-lubricating sleeve 9 relative to the housing. Of course, the self-lubricating sleeve 9 can also be relatively fixed to the drive rod, and the self-lubricating sleeve 9 rotates in cooperation with the mounting hole. Or, the self-lubricating sleeve 9 rotates in cooperation with both the drive rod and the mounting hole.

[0073] Furthermore, a sealing component is provided between one end of the self-lubricating sleeve 9 facing the clamping portion and the clamping portion. As Figure 20 shown, the sealing component is a sealing ring 901 sleeved on the drive rod. One end of the self-lubricating sleeve 9 facing the clamping portion contacts one side of the sealing ring 901, and the other side of the sealing ring 901 contacts one side of the clamping portion facing the self-lubricating sleeve 9.

[0074] Preferably, the self-lubricating sleeve 9 is made of POM or nylon. Other materials can also be used, as long as the situation where the housing and the jaws 10 are relatively stuck due to electrochemical and oxidation corrosion is avoided.

[0075] As Figure 11 、 Figure 12 and Figure 13As shown in the figure, the probe assembly 11 includes a pressing part 111 located outside the housing, a mounting ring 112 fixedly arranged relative to the housing, 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 includes a sensor bracket 151 fixedly connected to the mounting ring 112 and a pressure sensor 153 mounted on the sensor bracket 151; the sensor bracket 151 is provided with a pressing channel corresponding to the pressure sensor 153 and through which the pressing rod 114 passes. Through the above settings, the contact between the pressing rod 114 of the probe assembly 11 and the pressure sensor 153 is ensured, and the structural compactness of the probe assembly 11 and the pressure sensor assembly 15 is improved.

[0076] Furthermore, the probe assembly 11 further includes a guiding rod 115 fixed on the pressing part 111, and the guiding rod 115 is arranged parallel to the pressing rod 114; the sensor bracket 151 is provided with a guiding channel that telescopically cooperates with the guiding rod 115. Through the above settings, the function of preventing the relative rotation between the probe assembly 11 and the pressure sensor assembly 15 is achieved, and the stability is further improved.

[0077] In this embodiment, preferably, the pressing rod 114 is set as a cylindrical structure, and the pressing channel is a cylindrical hole; moreover, the guiding rod 115 is also set as a cylindrical structure, and the guiding channel is a cylindrical hole. Through the above settings, the processing and installation operations are facilitated. The pressing rod 114 can also be set as a prismatic structure, and the pressing channel is a prismatic hole, and the above effects can also be achieved.

[0078] As Figure 6 、 Figure 10 and Figure 13 shown in the figure, the probe assembly 11 further includes a coupling stop piece 113 fixedly arranged with the pressing part 111; the sensor bracket 151 is provided with a stop piece through hole 152 for the blocking end of the coupling stop piece 113 to pass through; the push-pull box further includes a receiver for judging whether the pressing part 111 is subjected to an external force, and the blocking end of the coupling stop piece 113 is correspondingly arranged with the receiver. It can be understood that when the blocking end of the coupling stop piece 113 extends into the receiver, it is judged that the pressing part 111 is subjected to an external force.

[0079] Moreover, when the piston handle initially presses the pressing part 111, after the blocking end of the coupling stop piece 113 extends into the receiver, 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, and reduces the speed of the transmission mechanism driving the push-pull box 100 to move, so that the push-pull box 100 continues 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 the pressing rod 114 contacts the pressure sensor 153. Through the above settings, the impact force when the pressing rod 114 contacts the pressure sensor 153 is effectively reduced.

[0080] Further, the pressure sensor 153 is floatably disposed on the sensor bracket 151. By adopting the floating pressure sensor 153 setting structure, the self-stress generated by the fixing of the pressure sensor 153 itself is eliminated, effectively improving the detection accuracy.

[0081] As Figure 21 shown, the pressure sensor 153 is mounted on the sensor bracket 151 by screws 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 settings, the pressure sensor 153 can float along the axial direction of the screw 15301, and the installation of the pressure sensor 153 is completed.

[0082] To prevent the pressure sensor 153 from rotating, more than two screws 15301 can be used to install the pressure sensor 153. Alternatively, the mounting holes on the pressure sensor 153 can be set as square holes or other non-circular holes, and the screws 15301 have a mating structure for circumferential positioning with the mounting holes, which can also prevent the pressure sensor 153 from rotating.

[0083] A pressing plate can also be provided on the side of the pressure sensor 153 away from the sensor bracket 151, and there is a gap between the pressing plate and the pressure sensor 153, which can also make the pressure sensor 153 floatably disposed on the sensor bracket 151.

[0084] To further improve the sealing effect, the housing has a probe through-hole for the pressing part 111 to extend out of the housing, and there is a soft glue sealing structure between the probe through-hole and the probe assembly 11.

[0085] Through the above settings, it effectively avoids external liquid or dust from entering the push-pull box 100 and improves the service life of the syringe pump.

[0086] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0087] The above 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. 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 these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An infusion pump, characterized in that, It includes a pump body, a transmission mechanism and a push-pull box provided on the pump body, wherein the push-pull box is connected to the driving end of the transmission mechanism; The push-pull box comprises: shell; Probe assembly; A pressure sensor assembly is disposed in the housing, wherein the pressure sensor assembly and the probe assembly are stacked; A clamping mechanism, wherein the clamping mechanism has two clamping jaws, each of which includes a driving rod and a clamping portion located outside the housing, wherein the driving rod is located at one end of the clamping portion and passes through the housing; A drive assembly is disposed in the housing, the drive assembly comprising a motor circuit board, a motor disposed on the motor circuit board, and a transmission assembly connecting the motor and the drive rod; an installation space is formed between the motor circuit board and the clamping portion, and the stacked combination of the probe assembly and the pressure sensor assembly is located in the installation space; The housing comprises a shell and a shell cover; The push-pull box further comprises a bracket plate disposed in the housing; the housing comprises a positioning support portion for positioning and supporting the bracket plate; the motor circuit board is fixedly connected to the bracket plate; The bracket plate is located on a side of the motor circuit board facing away from the housing cover; The bracket plate has a hollow avoidance portion for the motor and the transmission assembly to pass through.

2. The syringe pump according to claim 1, wherein, The suspended portion of the motor circuit board is a portion of the motor circuit board where the motor and the transmission assembly are not provided; The suspended portion of the motor circuit board, the motor and the clamping portion form the installation space, and the probe assembly and the pressure sensor assembly are located in the installation space.

3. The syringe pump according to claim 1, wherein, <The original 7-digit tag The housing comprises a shell and a shell cover; remains unchanged as it is not clear what needs to be done with it. If it's a placeholder for something specific in the context, it should be left as is. For now, it's just repeated here.> The housing comprises a shell and a shell cover; The clamping mechanism, the probe assembly, the pressure sensor assembly and the driving assembly are sequentially installed in the shell, and the shell cover is arranged on the shell.

4. The syringe pump according to claim 1, characterized in that, 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 bracket plate is positioned and matched with the stepped surface, and the bracket plate has a second concave-convex positioning structure that matches the first concave-convex positioning structure.

5. The syringe pump according to claim 4, wherein, The clamping mechanism further includes 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 extending into the housing; The transmission assembly includes a driving gear driven by the motor, and the transmission gear is meshed with the driving gear; The axial directions of the transmission gear and the driving gear are arranged along the installation direction of the driving assembly to the housing. When the driving assembly is installed in place relative to the housing, the transmission gear is meshed with the driving gear.

6. The syringe pump according to claim 5, characterized in that, 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.

7. The syringe pump according to claim 5, wherein, The clamping mechanism further includes a driven gear; The transmission gear is provided on one of the two clamping jaws, and the driven gear is provided on the other of the two clamping jaws, and the driven gear is meshed with the transmission gear.

8. The syringe pump according to claim 5, characterized in that, The transmission assembly further includes a gear reduction box disposed on the motor circuit board; The driving end of the motor is connected to the input end of the gear reduction box, and the driving gear is arranged at the output end of the gear reduction box.

9. The syringe pump according to claim 1, wherein, The push-pull box further includes an angle sensor for detecting the rotation angle of the clamping jaw and a slot connection structure arranged at one end of the driving rod far away from the clamping part; The angle sensor is relatively fixed with the motor circuit board; When the driving component is installed in place relative to the housing, the slot connection structure is in concave-convex fit with the angle sensor.

10. The syringe pump according to claim 1, wherein, A sealing structure is arranged between the housing and the housing cover.

11. The syringe pump according to claim 1, wherein, The clamping jaw mechanism further includes a transmission gear for driving the two clamping jaws to move relatively, and the transmission gear is arranged at the end of the driving rod extending into the outer shell; The transmission component includes a driving gear driven by the motor, and the transmission gear is meshed with the driving gear; In the power-off state of the motor, the driving gear can be driven to rotate by an external force.

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

13. The syringe pump according to claim 1, wherein, The outer shell has a mounting hole for the driving 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.

14. The syringe pump according to claim 13, characterized in that, The self-lubricating sleeve is relatively fixed with 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 facing the clamping part and the clamping part.

15. The syringe pump according to claim 1, wherein The probe assembly includes a pressing part located outside the outer shell, a mounting ring relatively fixed with the outer shell, an elastic connecting part connecting the pressing part and the mounting ring, and a pressing rod fixed on the pressing part; The pressure sensor assembly includes a sensor bracket fixedly connected with the mounting ring and a pressure sensor mounted on the sensor bracket; the sensor bracket has a pressing channel corresponding to the pressure sensor and for the pressing rod to pass through.

16. The syringe pump according to claim 15, wherein, The probe assembly further includes a guide rod fixed on the pressing part, and the guide rod is arranged parallel to the pressing rod; The sensor bracket has a guide channel in telescopic fit with the guide rod.

17. The syringe pump according to claim 15, characterized in that, The probe assembly further includes a coupling blocking piece fixedly arranged with the pressing part; The sensor bracket has a blocking piece through hole for the blocking end of the coupling blocking piece to pass through; The push-pull box further includes a receiver for judging whether the pressing part is subjected to an external force, and the blocking end of the coupling blocking piece is correspondingly arranged with the receiver.

18. The syringe pump according to claim 15, characterized in that, The pressure sensor is floatingly arranged on the sensor bracket.

19. The syringe pump according to claim 18, wherein, The pressure sensor is installed on the sensor bracket by screws; There is a floating gap between the positioning surface of the screw head facing the pressure sensor and the mating surface of the pressure sensor facing the screw head.

20. The syringe pump according to claim 15, wherein, The outer shell has a probe through hole for the pressing part to extend out of the outer shell, and there is a soft rubber sealing structure between the probe through hole and the probe assembly.

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