WO2021093326A1

WO2021093326A1 - Syringe driver

Info

Publication number: WO2021093326A1
Application number: PCT/CN2020/096221
Authority: WO
Inventors: 赵鹏仕; 刘华勇; 伍鼎韡; 邓南方; 左鹏飞
Original assignee: 深圳迈瑞科技有限公司
Priority date: 2019-11-15
Filing date: 2020-06-15
Publication date: 2021-05-20
Also published as: CN112807526A

Abstract

Provided is a syringe driver 100, comprising a push-pull cartridge assembly (20) and a driver body apparatus (10). The driver body apparatus (10) comprises a base body (11), a slide assembly (12), a hollow shaft (13), a transmission assembly (14), a drive mechanism (15), a displacement monitoring assembly (18), and a first circuit board (7); the slide assembly (12) comprises a first slide member (121) and a second slide member (122); the hollow shaft (13) is connected to a second slide member (122) and the push-pull cartridge assembly (20); the transmission assembly (14) comprises a screw rod (141) drivingly connected to the second slide member (122); the screw rod (141) is arranged parallel to, and spaced apart from, the first slide member (121) and is sleeved with the hollow shaft (13); the drive mechanism (15) is drivingly connected to the transmission assembly (14); driven by means of the drive mechanism (15), the transmission assembly (14) converts the rotary motion of the screw rod (141) into the linear motion of the second slide member (122) so that the second slide member (122) drives the push-pull cartridge assembly (20) connected to the hollow shaft (13) to reciprocate relative to the base body (11); the displacement monitoring element (18) is arranged on one side of the base body (11), and is electrically connected to the first circuit board (17) to monitor the displacement of the second slide member (122). The syringe driver is compact in structure and thus the miniaturization of a syringe driver is achieved.

Description

Injection pump

Cross-references to related applications

This application is filed based on a Chinese patent application with an application number of 201911121177.6 and an application date of November 15, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by reference.

Technical field

This application relates to the technical field of medical devices, and in particular to a syringe pump.

Background technique

The syringe pump is a device used to push the plunger of the syringe for infusion and infusion, so as to achieve high-precision, smooth and pulsation-free liquid transmission. The pump body device is one of the most critical components in the syringe pump for achieving the above-mentioned functions. Since the pump body device of the syringe pump needs to be equipped with many parts, in the related art, the pump body device has a heavy structure and a large volume, which is not conducive to the miniaturization of the syringe pump.

Summary of the invention

In view of this, the embodiments of the present application are expected to provide a syringe pump with a relatively compact structure.

To achieve the foregoing objective, one aspect of the embodiments of the present application provides a syringe pump, including:

Push-pull box assembly;

A pump body device, the pump body device includes: a seat body, a sliding assembly, a hollow shaft, a transmission assembly, a driving mechanism, a displacement monitoring element, and a first circuit board; the sliding assembly includes a first A sliding part, and a second sliding part slidably connected to the first sliding part; the hollow shaft connects the second sliding part and the push-pull box assembly; the transmission assembly includes a transmission with the second sliding part Connected screw rod, the screw rod and the first sliding member are arranged in parallel and spaced apart and are sleeved with the hollow shaft; the driving mechanism is drivingly connected with the transmission assembly; by the driving of the driving mechanism, the The transmission assembly converts the rotational movement of the screw rod into the linear movement of the second sliding member, so that the second sliding member drives the push-pull box assembly connected with the hollow shaft relative to the seat body Perform reciprocating motion; the displacement monitoring element is arranged on one side of the base body and is electrically connected to the first circuit board to monitor the displacement of the second sliding member.

Another aspect of the embodiments of the present application also provides a syringe pump, including:

Push-pull box assembly;

A pump body device, the pump body device includes: a seat body, a sliding component, a hollow shaft, a transmission component, a driving mechanism, a displacement monitoring element, and a first circuit board; the seat body has an accommodating cavity, and the sliding component includes two The guide rods are arranged in parallel and spaced apart and the sliders passing through the two guide rods; the two guide rods are arranged in the accommodating cavity and are mated with the seat body; the hollow shaft Is arranged between the two guide rods, one end of the hollow shaft is connected to the sliding block, and one end of the hollow shaft away from the sliding block is connected to the push-pull box assembly; the driving mechanism is arranged at the In the accommodating cavity, the transmission assembly includes a pulley mechanism, the pulley mechanism includes a timing belt, a first-stage gear, a second-stage gear, and a screw rod that is connected to the sliding block in transmission and is sleeved with the hollow shaft; The timing belt, the first-stage gear, and the second-stage gear are arranged at one end of the seat body away from the push-pull box assembly, and on the side of the seat body away from the accommodating cavity; the screw rod is far away One end of the push-pull box assembly is fixedly connected with the second-stage gear, the second-stage gear meshes with the first-stage gear for transmission, and the first-stage gear is drivingly connected with the output shaft of the driving mechanism through the timing belt Driven by the drive mechanism, the transmission assembly converts the rotary motion of the screw rod into the linear motion of the slider, so that the slider drives the push-pull box assembly connected to the hollow shaft Reciprocating movement relative to the seat; the first circuit board is arranged at one end of the seat close to the push-pull box assembly, and is connected to the side wall of the seat far from the receiving cavity, along In the axial direction of the guide rod, the projections of the two guide rods are located within the projection range of the first circuit board; the displacement monitoring element includes a strip-shaped long potentiometer and is connected to the slider And a plunger assembly with a contact; the long potentiometer includes a first section, a second section connected to the first section, and a long potentiometer arranged on the first section along the length direction of the long potentiometer Resistor; the first section is arranged in the accommodating cavity, and is connected with the side wall of the seat body at the accommodating cavity; the second section is provided with the first circuit from the seat body One end of the board protrudes out of the accommodating cavity; the second section is bent toward the side where the first circuit board is provided, and is electrically connected to the first circuit board; the contact is connected to the The resistance body contacts to monitor the displacement of the slider.

The syringe pump of the embodiment of the present application can greatly save the installation space in the seat body by socketing the hollow shaft with the screw rod, thereby making the overall structure of the syringe pump more compact, which is beneficial to realize the miniaturization of the syringe pump .

Description of the drawings

Fig. 1 is a schematic structural diagram of a pump body device of a syringe pump according to an embodiment of the application;

Fig. 2 is a schematic structural diagram of the pump body device shown in Fig. 1 from another perspective;

Fig. 3 is a schematic structural view of the pump body device shown in Fig. 1 from another perspective;

4 is a schematic diagram of the structure of the base shown in FIG. 1;

Fig. 5 is a schematic structural diagram of the plunger assembly shown in Fig. 1;

Fig. 6 is a schematic structural diagram of the plunger assembly shown in Fig. 1 from another perspective;

Figure 7 is an exploded view of the plunger assembly shown in Figure 1;

Fig. 8 is a schematic diagram of the structure of the long potentiometer shown in Fig. 1;

Figure 9 is a cross-sectional view of a partial structure of the pump body device shown in Figure 1;

Figure 10 is a schematic diagram of the fit of the spiral groove of the screw rod and the spiral teeth of the nut shown in Figure 9;

Figure 11 is a schematic diagram of the cooperation of the spiral groove of another screw rod and the spiral teeth of the nut;

Figure 12 is a schematic diagram of the matching structure of the pump body device, the cable and the push-pull box assembly shown in Figure 1;

Figure 13 is a schematic diagram of the mating structure of the claw clamp of the push-pull box assembly shown in Figure 9 with related structures in the box body;

Figure 14 is an exploded view of the push-pull box assembly shown in Figure 13;

Fig. 15 is a schematic diagram of the matching structure of the syringe pump and the syringe having the pump body device and the push-pull box assembly shown in Fig. 12.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the application and the technical features in the embodiments can be combined with each other. The detailed description in the specific implementation should be understood as an explanation of the purpose of the application, and should not be regarded as Improper restrictions on this application.

In the description of this application, the "length direction" is based on the orientation or positional relationship shown in FIG. 6. It should be understood that these orientation terms are only for the convenience of describing the application and simplifying the description, rather than indicating or implying what is meant. The device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

The present application provides a syringe pump 100, which is used for cooperating with a syringe 200 containing medicinal liquid, so as to realize high-precision, stable and pulsation-free liquid transmission.

Please refer to FIGS. 1 to 4, 9, and 12, the syringe pump 100 of this embodiment includes: a push-pull box assembly 20 and a pump body device 10. The pump body device 10 includes a base 11, a sliding assembly 12, a hollow shaft 13, a transmission assembly 14, a driving mechanism 15, a displacement monitoring element 18 and a first circuit board 17. The sliding assembly 12 includes a first sliding member 121 disposed on the base 11 and a second sliding member 122 slidably connected to the first sliding member 121. The hollow shaft 13 connects the second sliding member 122 and the push-pull box assembly 20. The transmission assembly 14 includes a screw rod 141 that is drivingly connected to the second sliding part 122. The screw rod 141 is arranged in parallel and spaced apart from the first sliding part 121 and is sleeved with the hollow shaft 13. The driving mechanism 15 is drivingly connected with the transmission assembly 14. Driven by the drive mechanism 15, the transmission assembly 14 converts the rotational movement of the screw rod 141 into the linear movement of the second sliding member 122, so that the second sliding member 122 drives the push-pull box assembly 20 connected to the hollow shaft 13 relative to the base body 11 Perform reciprocating motion. The displacement monitoring element 18 is arranged on one side of the base 11 and is electrically connected to the first circuit board 17 to monitor the displacement of the second sliding member 122.

Specifically, referring to FIG. 15, the syringe pump 100 of this embodiment further includes a housing 30 with an inner cavity, the push-pull box assembly 20 is arranged outside the housing 30, the pump body device 10 is arranged in the inner cavity, and the housing 30 can The pump body device 10 is protected, and it is also convenient to sterilize the syringe pump 100 after use. The driving mechanism 15 may be a motor with a driving function such as a stepper motor. The hollow shaft 13 is mainly used to connect the push-pull box assembly 20 and the second sliding member 122, so that the second sliding member 122 can drive the push-pull box assembly 20 during the sliding process. The synchronous movement further enables the push-pull box assembly 20 to reciprocate relative to the base 11. The screw rod 141 mainly rotates to convert its own rotary motion into the linear motion of the second sliding member 122, thereby enabling the second sliding member 122 to slide relative to the first sliding member 121.

In the related art, the push-pull box assembly is usually connected to the second sliding member through a connecting shaft, and the connecting shaft and the screw rod are arranged in parallel and spaced apart, so that the connecting shaft and the screw rod need to occupy a larger installation space in the seat body. In turn, the volume of the pump body device is larger.

In this embodiment, the connecting shaft is designed as a hollow shaft 13. While the hollow shaft 13 is sleeved with the screw rod 141, it is also connected with the second sliding member 122. The screw rod 141 can rotate in the hollow shaft 13 to make its own The rotational movement is converted into the linear movement of the second sliding member 122. Since the second sliding member 122 can reciprocate linearly along the axial direction of the screw rod 141 (that is, the direction indicated by the double arrow at A in FIG. 1) under the driving of the driving mechanism 15, the second sliding member 122 is The movement process can drive the push-pull box assembly 20 connected with the hollow shaft 13 to reciprocate along the axial direction of the screw rod 141. Compared with the connecting shaft and the screw rod arranged in parallel and spaced apart, the sleeved hollow shaft 13 and the screw rod 141 can greatly save installation space, thereby making the structure of the pump body device 10 more compact, thereby making the syringe pump 100 The overall structure is more compact. The reciprocating motion mentioned in the present application refers to when injection is required, driven by the second sliding member 122, the push-pull box assembly 20 can push the syringe 200 to move in the injection direction. When the injection is completed, the syringe 200 is removed from the syringe pump 100 After being removed, the push-pull box assembly 20 can be driven to move in the opposite direction by the second sliding member 122 immediately, so that the push-pull box assembly 20 can be reset, or it does not need to be reset immediately. The sliding member 122 drives the push-pull box assembly 20 to move in the opposite direction. After the push-pull box assembly 20 is reset, a new syringe 200 is clamped. That is to say, the reciprocating motion mentioned in this application mainly means that the push-pull box assembly 20 can move in two opposite directions, and it does not require that the push-pull box assembly 20 must be between the two opposite directions within a certain period of time. Keep moving.

Please refer to FIGS. 1 to 3 and 9, the transmission assembly 14 of this embodiment further includes a nut 142 matched with the screw rod 141, and the second sliding member 122 is connected to the nut 142.

Specifically, referring to FIG. 10, the screw rod 141 of this embodiment has a spiral groove 141a, and the normal cross-sectional shape of the spiral groove 141a is an arc. The nut 142 has a spiral thread 142a that fits with the spiral groove 141a. The nut 142 is arranged on the second sliding member 122. Through the driving of the driving mechanism 15, the rotary motion of the screw rod 141 can be converted into the linear motion of the nut 142, so that the nut 142 can drive the second sliding member 122 to slide relative to the first sliding member 121.

Specifically, in the related art, a trapezoidal screw is generally used in the syringe pump to convert its own rotary motion into the linear motion of the second sliding member. However, the guide accuracy of the trapezoidal screw is not high, which will cause disadvantages to the use of the syringe pump. Impact. In order to improve the guiding accuracy, some injection pumps use a ball screw mechanism to replace the trapezoidal screw. However, on the one hand, the cost of the ball screw mechanism is higher. On the other hand, the ball screw mechanism is relatively complex because of its relatively complicated structure. The volume of the ball screw mechanism is also relatively large, which requires a large installation space in the pump body device, which is not conducive to the miniaturization of the injection pump.

However, this embodiment mainly improves the traditional screw rod and the screw nut matched with the screw rod. The normal cross-sectional shape of the spiral groove 141a of the screw rod 141 is arc, and the thread shape of the screw thread 142a of the screw nut 142 is similar to that of the screw nut 142a. The arc-shaped spiral groove 141a matches, that is to say, the tooth profile of the screw thread 142a of the nut 142 is actually arc-shaped. Compared with the trapezoidal screw, the arc screw 141 of this embodiment has higher guiding accuracy. , Which can meet the requirements of the injection pump 100. Compared with the ball screw mechanism, the arc screw 141 and the nut 142 of this embodiment are of lower cost and require relatively small installation space, which reduces the cost of the injection pump. The production cost of 100 is also conducive to the miniaturization of the syringe pump 100.

The normal cross-sectional shape of the spiral groove 141a in this embodiment is a double arc shape, and the tooth shape of the spiral thread 142a is a semicircle. The contact angle β between the spiral groove 141a and the spiral tooth 142a can be set as required. Preferably, the contact angle β between the spiral groove 141a and the spiral tooth 142a (the normal line of the tangent point of the spiral groove 141a and the spiral tooth 142a is perpendicular to The angle between the perpendiculars of the axis of the screw rod 141 is 45°. It is understandable that the spiral groove 141a may also have other arc-shaped structures. For example, referring to FIG. 11, the normal cross-sectional shape of the spiral groove 141'a of the screw rod 141' may also be an ellipse. In other embodiments The normal cross-sectional shape of the spiral groove 141a can also be a single arc shape, etc., depending on the normal cross-sectional shape of the spiral groove 141a matched with the spiral thread 142a, the thread shape of the spiral thread 142a can also be other arc shapes. The structure, for example, the shape of the spiral tooth 142a can also be a single arc shape, an ellipse shape, a double arc shape, etc. other than a semicircle.

Referring to FIG. 9, the second sliding member 122 of this embodiment has a third mounting hole 122'c, and the nut 142 is disposed in the third mounting hole 122'c, and is threadedly connected with the second sliding member 122, and at the same time, hollow The end of the shaft 13 close to the nut 142 is also inserted into the third mounting hole 122'c. That is to say, the nut 142 is arranged inside the second sliding member 122, thereby saving the installation space of the nut 142, and the nut 142 is threadedly connected with the second sliding member 122, which can facilitate the connection of the second sliding member 122 and the second sliding member 122. The disassembly and assembly of the silk mother 142. Driven by the driving mechanism 15, the rotational movement of the screw rod 141 can be converted into the linear movement of the nut 142, so that the nut 142 can drive the second sliding member 122 connected to it to slide relative to the first sliding member 121.

In the related art, there is an injection pump that uses a screw rod and a clutch nut to achieve the transmission of the second sliding member. The screw rod and the clutch nut can be separated. This type of injection pump is in use. , Through the cooperation of the driving mechanism and the transmission assembly, the push-pull box assembly can only be driven to move the syringe in the direction of injection. When the injection is completed and the push-pull box assembly needs to be reset, the operator needs to manually rotate the push-pull box assembly. , Separate the screw rod and the clutch nut, and then continue to manually pull the push-pull box assembly back in the opposite direction, that is to say, this kind of injection pump is actually a semi-manual operation mode, and the push-pull box assembly is driven by the driving mechanism during injection. Movement, the push-pull box assembly is manually pulled back when resetting.

However, the screw 141 and the nut 142 of the pump body device 10 of this embodiment cannot be separated. At the same time, driven by the driving mechanism 15, the nut 142 can reciprocate linearly along the screw 141, thereby making it pass through the hollow The push-pull box assembly 20 connected with the shaft 13 and the second sliding member 122 can be realized by electric control no matter whether it moves in the direction of pushing the syringe 200 to the injection direction or resets, which can save the trouble of manual operation. In addition, when the push-pull box assembly 20 is reset, since there is no need to manually separate the screw 141 and the nut 142, there is no need to configure a corresponding mechanical structure for the separation of the screw 141 and the nut 142, which can further save money. The installation space further makes the structure of the transmission assembly 14 of this embodiment simpler, and the overall structure of the pump body device 10 can also be more compact. The screw 141 of this embodiment is directly threaded with the nut 142. In another embodiment, the screw 141 may also be a ball screw, that is, balls are arranged between the screw 141 and the nut 142, or, The screw nut 142 is not provided, but the screw rod 141 is directly threaded with the second sliding member 122. As long as the screw rod 141 or the screw rod 141 cooperates with other intermediate parts, the rotary motion of the screw rod 141 can be converted into the second sliding The linear movement of the piece 122 is sufficient.

Please refer to FIG. 9, the transmission assembly 14 of this embodiment further includes two bearings 144 arranged adjacently on the base 11. The end of the screw rod 141 drivingly connected with the driving mechanism 15 is inserted through the two bearings 144, and the end of the screw rod 141 away from the bearing 144 is a free end.

In the related art, most of the screw rod of the injection pump is supported by a bearing at one end, and the end of the screw rod away from the bearing is matched with a copper sleeve as a slewing support. However, the installation accuracy of this setting method is poor, and there is a risk of jamming the pump. In addition, during the rotation of the screw, the end of the screw far away from the bearing is noisy and the copper sleeve is severely worn, thereby posing a certain safety risk.

The one end of the screw rod 141 in this embodiment drivingly connected to the driving mechanism 15 is supported by two bearings 144. More specifically, the bearing 144 in this embodiment is a deep groove ball bearing, one of the two deep groove ball bearings A gasket 145 is sandwiched between. However, the end of the screw rod 141 away from the bearing 144 is not provided with a supporting structure. Since the two bearings 144 can bear relatively large axial forces, the smoothness of high-speed motion can also be ensured when the end of the screw 141 away from the bearing 144 is not provided with a support structure. At the same time, the screw 141 is far away from the bearing. One end of the 144 does not need to be provided with a supporting structure such as a copper sleeve. Therefore, the screw 141 of this embodiment can reduce the movement noise during the rotation, and there is no risk of jamming the pump and wearing the supporting structure, thereby greatly improving the syringe pump 100 Security.

It can be understood that, in other embodiments, the bearing 144 may also be an angular contact bearing, and the two angular contact bearings may be installed back to back DB or face to face DF. In other embodiments, only one bearing 144 may be provided at one end of the screw rod 141, or more than two bearings 144 may be provided, or one or more bearings 144 may be provided at both ends of the screw rod 141, respectively.

Please continue to refer to FIGS. 1 to 3 and 9, in this embodiment, the first sliding member 121 is a guide rod 121', and the second sliding member 122 is a slider 122' passing through the guide rod 121'. The slider 122 'Able to slide along the guide rod 121'.

Specifically, the seat body 11 of the present embodiment has a receiving cavity 11a, and a first positioning hole 11b, a second positioning hole 11c, and a limiting hole 11d respectively communicating with the receiving cavity 11a. The first positioning hole 11 b is provided on the side of the base 11 close to the push-pull box assembly 20. The second positioning hole 11c is opposite to the first positioning hole 11b, one end of the guide rod 121' is inserted into the first positioning hole 11b, and the end of the guide rod 121' far away from the first positioning hole 11b is inserted into the second positioning hole In other words, the guide rod 121 ′ of this embodiment is plug-fitted with the base 11. Since two guide rods 121' are provided in this embodiment, two first positioning holes 11b and two second positioning holes 11c are correspondingly provided on the seat body 11. The limiting hole 11d is on the same side as the first positioning hole 11b, and the hollow shaft 13 passes through the limiting hole 11d. Driven by the slider 122', the hollow shaft 13 can reciprocate along the axial direction of the limiting hole 11d. The limiting hole 11d can guide the hollow shaft 13 so that the hollow shaft 13 can be more stable during the reciprocating movement.

Further, the slider 122' is formed with first mounting holes 122'a and second mounting holes 122'b that are spaced apart. The projection of the first mounting hole 122'a along the axial direction is a closed hole, the projection of the second mounting hole 122'b along the axial direction is a semi-closed hole, and one of the two guide rods 121' penetrates the first mounting hole In 122'a, the other is inserted in the second mounting hole 122'b. That is to say, the sliding assembly 12 of this embodiment is a double guide rod that cooperates with the sliding block 122'. At the same time, please refer to FIG. 9. In this embodiment, the projection of the "first mounting hole 122'a along the axial direction is closed "Hole" mainly refers to a closed structure in which at least a part of the side wall of the first mounting hole 122'a is ring-shaped, so that the guide rod 121' penetrating through the first mounting hole 122'a can be restricted in the radial direction, and The "projection of the second mounting hole 122'b along the axial direction as a semi-closed hole" mainly means that the side wall of the second mounting hole 122'b has at least one notch arranged along the axial direction, thereby making the penetration The guide rod 121' in the second mounting hole 122'b can have a certain offset in the radial direction. That is to say, by using the second mounting hole 122'b, a certain adjustment margin can be reserved for the slider 122' in the direction perpendicular to the guide rod 121' to ensure the guiding accuracy of the guide rod 121'. It can be understood that the number of guide rods 121' is not limited to two. In other embodiments, the number of guide rods 121' may be one or more than two. The cross-sectional shape of the guide rod 121' is also not limited. For example, the cross-section of the guide rod 121' can be round, triangular, rectangular, special-shaped, etc., as long as the guide rod 121' can cooperate with the slider 122'.

In other embodiments, the first sliding member 121 may also be a sliding groove, and the second sliding member 122 may be a guide block that cooperates with the sliding groove, or the first sliding member 121 may also be a guide rail, and the second sliding member 122 has The guide seat of the guide wheel, as long as the first sliding member 121 and the second sliding member 122 can cooperate with each other.

In the related art, in order to ensure the smooth movement of the slider, some pump body devices need to apply a certain amount of lubricant or grease on the slider and/or the guide rod. However, the excess lubricant or grease will be on the slider. Fall into other structures of the pump body device during the sliding process. There are also some pump body devices that use plastic sliders to meet the sliding requirements through the self-lubricating properties of the slider itself. Although this type of slider does not need to be coated with lubricant or grease, its guiding accuracy is relatively poor.

In order to solve the above problems, please refer to FIG. 9, the sliding assembly 12 of this embodiment further includes an oil-containing bushing 123 arranged on the sliding block 122 ′, and the sliding block 122 ′ is slidably connected to the guide rod 121 ′ through the oil-containing bushing 123. That is to say, the first mounting hole 122'a and the second mounting hole 122'b of this embodiment are respectively provided with an oil-containing bushing 123, and the two guide rods 121' actually pass through the corresponding oil-containing bushings. In 123, the oil-containing bushing 123 is slidingly connected with the guide rod 121'. At the same time, in order to ensure that the sliding block 122' passing through the guide rod 121' has a certain adjustment margin, when installing the oil-impregnated bushing 123, an oil-impregnated bushing 123 and the first mounting hole 122'a have an interference fit, and The oil-containing bushing 123 installed in the second mounting hole 122'b can open a degree of freedom between the two guide rods 121', and further can also release a degree of freedom in the direction perpendicular to the guide rod 121', namely The oil-containing bushing 123 arranged in the second mounting hole 122'b can be offset in the radial direction of the guide rod 121' in the second mounting hole 122'b, but will not escape from the second mounting hole 122'b. Because the oil-containing bushing 123 has good self-lubrication and high guiding accuracy, there is no need to use lubricant or grease between the slider 122' and the guide rod 121' to ensure the smooth movement of the slider 122'. Or when the grease falls into other structures of the pump body device 10 and pollutes the pump body device 10, it can also ensure that the guiding accuracy of the slider 122' meets the requirements of the syringe pump 100. In addition, please refer to FIG. 1, the limit hole 11d of this embodiment is actually provided with an oil-containing bushing 123, and the hollow shaft 13 passes through the oil-containing bushing 123 in the limit hole 11d and can be opposed to the oil-containing bushing 123. The bushing 123 slides, thereby improving the stability of the movement of the hollow shaft 13. It can be understood that, in other embodiments, the first mounting hole 122'a, the second mounting hole 122'b, and the limiting hole 11d may not be provided with the oil-containing bushing 123.

Please continue to refer to FIGS. 1 and 4, the pump body device 10 of this embodiment further includes an optical coupler 16, and the first circuit board 17 is disposed on the base 11 and covers the side of the first positioning hole 11b away from the accommodating cavity 11a . The optical coupler 16 is electrically connected to the first circuit board 17.

Specifically, the optical coupler 16 is mainly used to detect the starting position of the push-pull box assembly 20 and transmit the detection signal to the first circuit board 17. Since one end of the guide rod 121' of this embodiment is fixed in the first positioning hole 11b by plugging, the first circuit board 17 is actually arranged on the side wall of the base 11 and covers the first The positioning hole 11b is far away from the side of the containing cavity 11a, so the first circuit board 17 can stop and limit the guide rod 121' when the first positioning hole 11b fails due to accidents, so as to prevent injection During the use of the pump 100, the guide rod 121' slips out of the first positioning hole 11b, which affects the normal use of the syringe pump 100. It should be noted that the covering mentioned in this application refers to the direction facing the first circuit board 17, and the first circuit board 17 can block the two first positioning holes 11b, that is, along the axial direction of the guide rod 121', The projections of the two guide rods 121' are located within the projection range of the first circuit board 17, but there may be a certain gap between the first circuit board 17 and the first positioning hole 11b.

In the related art, a plurality of circuit boards are usually arranged in the accommodating cavity of the base body, a detection element for detecting the initial position of the push-pull box assembly is electrically connected to a circuit board, and a displacement monitoring element for monitoring the displacement of the second sliding member It is electrically connected to another circuit board. Since there are more circuit boards in the containing cavity, these circuit boards will occupy more installation space in the containing cavity. The displacement monitoring element 18 and the optical coupler 16 of this embodiment are The same first circuit board 17 is shared, and the first circuit board 17 is arranged on the outer side wall of the base 11 instead of being arranged in the accommodating cavity 11a. Therefore, this arrangement reduces the total number of circuit boards at the same time , It will not occupy the installation space of the containing cavity 11a, and thus can ensure that the overall structure of the pump body device 10 can be more compact.

Please refer to FIGS. 1 to 3 and 5, the displacement monitoring element 18 of this embodiment includes a potentiometer 181 and a plunger assembly 182 detachably connected to the second sliding member 122. The plunger assembly 182 is in contact with the potentiometer 181 to monitor the displacement of the slider 122'.

Specifically, in the process of using the syringe pump, it is necessary to monitor the position of the slider 122' at all times. In related technologies, the displacement of the monitoring slider 122' is mostly monitored by sliding wire, which usually requires the use of a linear displacement sensor. Since the volume of the linear displacement sensor is relatively large, the linear displacement sensor also needs to take up more installation space. In this embodiment, the potentiometer 181 and the plunger assembly 182 are used to monitor the displacement of the slider 122'. Specifically, referring to FIG. 6, the potentiometer 181 is a strip-shaped long potentiometer 181'. The long potentiometer 181' includes the long potentiometer 181', including the first section 1811' and the first section 1811' connected to the first section 1811'. The second section 1812' and the resistor 1813' arranged on the first section 1811' along the length direction of the long potentiometer 181'. The first section 1811' is arranged in the accommodating cavity 11a, and is connected with the side wall of the seat body 11 at the accommodating cavity 11a; the second section 1812' extends from the end of the seat body 11 where the first circuit board 17 is arranged to the accommodating cavity 11a outside. The second section 1812 ′ is bent toward the side where the first circuit board 17 is provided, and is electrically connected to the first circuit board 17. The contact 1821 is in contact with the resistor body 1813'. During the sliding process of the slider 122', the plunger assembly 182 mounted on the slider 122' slides along with the slider 122'. The contact 1821 in the plunger assembly 182 is always connected with the resistor body of the long potentiometer 181'. The 1813' keeps in contact. According to the different contact positions of the contact 1821 and the resistor 1813', the long potentiometer 181' can transmit the corresponding monitoring signal to the first circuit board 17, so that the position of the slider 122' can be monitored. Since the strip-shaped long potentiometer 181' has a simple structure and a small volume, and does not need to occupy too much installation space, the overall structure of the pump body device 10 of this embodiment can be more compact.

The resistor body 1813' of this embodiment is made of self-lubricating material POM (polyoxymethylene), so that the contact 1821 can slide along the resistor body 1813', and the long potentiometer 181' can be made of flexible material for ease of assembly. Bending the second section 1812' of the long potentiometer 181' can also be directly prefabricated into the shape shown in Fig. 1.

5-7, the plunger assembly 182 of this embodiment is mainly composed of a contact 1821, a main body 1822, a positioning post 1822a, a mounting channel 1822b, a spring 1823, and a buckle 1824. The main body 1822 is formed with a positioning post 1822a, The mounting channel 1822b, the abutment interface 1822c and the threaded hole 1822d are arranged along the radial direction of the mounting channel 1822b and communicate with the mounting channel 1822b. The axis of the threaded hole 1822d is parallel to the axis of the positioning column 1822a, and the buckle 1824 is formed with The through hole 1824a, and two clamping feet 1824a respectively arranged on both sides of the axis of the through hole 1824a. When assembling the plunger assembly 182, first insert the contact 1821 into the mounting channel 1822b, a part of the structure of the contact 1821 (that is, the end in contact with the resistor body 1813') passes through the mounting channel 1822b and extends out of the mounting channel 1822b, and then Insert a part of the structure of the spring 1823 into the mounting channel 1822b and sleeve it on the contact 1821, and the other part of the structure of the spring 1823 is located outside the mounting channel 1822b. Finally, the two pins 1824a of the buckle 1824 are facing the mounting channel 1822b, and the card The buckle 1824 is inserted into the mounting channel 1822b. The structure of the spring 1823 outside the mounting channel 1822b passes through the through hole 1824b on the buckle 1824. By rotating the buckle 1824, the two pins 1824a on the buckle 1824 abut against the main body 1822. On the side wall at the abutment interface 1822c. When disassembling the plunger assembly 182, it is only necessary to rotate the buckle 1824 to the non-abutting position, and accordingly remove the buckle 1824, the spring 1823 and the contact 1821 from the installation channel 1822b. When the plunger assembly 182 needs to be installed on the slider 122', the positioning post 1822a on the main body 1822 is mated with the positioning groove (not shown) formed on the slider 122', and the spring 1823 is located in the installation channel 1822b The outer end abuts on the slider 122', the first threaded hole 1822d is aligned with the second threaded hole (not shown) formed on the slider 122', and the screw is screwed into the first threaded hole 1822d and the first threaded hole 1822d and the second threaded hole (not shown). In the two threaded holes, the plunger assembly 182 is fastened to the slider 122', that is, the plunger assembly 182 of this embodiment is a detachable structure, and the plunger assembly 182 and the slider 122' are also detachable Therefore, when the plunger assembly 182 needs to be replaced, it is convenient to disassemble and assemble the plunger assembly 182, or when the parts of the plunger assembly 182 are damaged, there is no need to use tools and manually You can quickly replace the corresponding parts.

Referring to FIGS. 1 to 3, the transmission assembly 14 of this embodiment further includes a pulley mechanism 143, and the pulley mechanism 143 includes a timing belt 1431, a primary gear 1432 and a secondary gear 1433. The output shaft of the driving mechanism 15 is drivingly connected with the primary gear 1432 through a timing belt 1431; the primary gear 1432 meshes with the secondary gear 1433 for transmission, and the secondary gear 1433 is fixedly connected with the screw rod 141.

Specifically, in the related art, a gear assembly is usually used for transmission between the driving mechanism and the screw rod. The gear assembly is directly drivingly connected with the driving mechanism, and the driving mechanism drives the screw rod to rotate through the gear assembly. The provision of the gear assembly can ensure that the torque output of the driving mechanism is amplified, and the rotation speed of the screw rod can also be guaranteed to meet the requirements. However, in the process of rapid loading, the drive mechanism needs to run at a high speed, and the conventional gear assembly will not only bring huge noises during the rotation process, but will also drastically reduce the life of the drive mechanism and the gear assembly. In addition, this connection method has no Overload protection is prone to accidents.

The pulley mechanism 143 of this embodiment is a two-stage transmission structure. The first stage is a synchronous pulley transmission, that is, the output shaft of the driving mechanism 15 and the first-stage gear 1432 are drivingly connected through a timing belt 1431, instead of connecting the output of the driving mechanism 15 The shaft is directly drivingly connected with the first-stage gear 1432, and the second-stage is the meshing transmission of the first-stage gear 1432 and the second-stage gear 1433. The structure of the synchronous belt pulley can ensure the accurate transmission of the output revolutions of the driving mechanism 15. At the same time, the synchronous belt 1431 can provide overload protection for the driving mechanism 15. The elasticity of the synchronous belt 1431 can also reduce the transmission noise, thus making this implementation While the transmission assembly 14 of the example has a noise reduction function, it also improves the safety of the syringe pump 100. It can be understood that, in other embodiments, a conventional gear mechanism without a timing belt may be used instead of the pulley mechanism 143.

Referring to FIGS. 12 to 14, the push-pull box assembly 20 of this embodiment includes: a box body 21, a probe assembly 26, a pressure sensor assembly 27, a jaw mechanism 25 and a jaw drive assembly 22. The pressure sensor assembly 27 is arranged in the box body 21 and stacked with the probe assembly 26. The claw clamp mechanism 25 has two claw clamps 251, and the claw clamp 251 includes a driving rod and a clamping part located outside the box body 21. The driving rod is located at one end of the clamping part and penetrates the box body 21. The jaw drive assembly 22 is arranged in the box body 21. The jaw drive assembly 22 includes a second circuit board 222, a push-pull box motor 221 disposed on the second circuit board 222, and a jaw drive assembly 23 that connects the push-pull box motor 221 and the drive rod. The push-pull box motor 221 and the claw clip transmission assembly 23 are located at one end of the second circuit board 222. A sensor installation space is formed between the suspended portion and the clamping portion of the second circuit board 222, and the stacking combination of the probe assembly 26 and the pressure sensor assembly 27 is located in the sensor installation space.

In the injection pump 100 of this embodiment, the push-pull box motor 221 and the drive rod are connected through the claw clamp transmission assembly 23. While the connection is realized, the claw clamp transmission assembly 23, the push-pull box motor 221 and the drive rod form a support on the second circuit board. The physical structure between 222 and the clamping part, and the physical structure is located at one end of the second circuit board 222. This makes the part of the second circuit board 222 not provided with the push-pull box motor 221 and the claw clip transmission assembly 23 suspended relative to the clamping part, that is, the suspended part of the second circuit board 222. A sensor installation space is formed between the suspended portion and the clamping portion of the second circuit board 222, and the stacking combination of the probe assembly 26 and the pressure sensor assembly 27 is located in the sensor installation space. Through the above arrangement, the space between the second circuit board 222 and the clamping part is reasonably used, and the probe assembly 26 and the pressure sensor assembly 27 are prevented from occupying extra space in the push-pull box assembly 20, and the internal components of the push-pull box assembly 20 are effectively improved. The compactness of the structure reduces the overall volume of the push-pull box assembly 20.

In this embodiment, the box body 21 includes a box body 211 and a box cover 212. The jaw mechanism 25, the pressure sensor assembly 27, the probe assembly 26, and the jaw drive assembly 22 are sequentially installed in the box body 211. The box cover 212 is arranged on the box body 211 to facilitate the assembly of the push-pull box assembly 20. That is, the opening of the box body 211 faces the box cover 212, the claw clamping mechanism 25, the pressure sensor assembly 27, the probe assembly 26, and the claw drive assembly 22 are sequentially installed in the box body 211 through the openings, and the box cover 212 is covered on the box body 211. After being mounted, the jaw clamping mechanism 25, the pressure sensor assembly 27, the probe assembly 26, and the jaw clamping drive assembly 22 are the closest component to the box cover 212 as the jaw clamping drive assembly 22. Among them, the box body 211 and the box cover 212 are preferably detachably connected, for example, connected by screws or connected by buckles.

It is also possible to install the jaw mechanism 25, the pressure sensor assembly 27, the probe assembly 26, and the jaw drive assembly 22 outside the box body 21 in the box body 21 together after the assembly is completed.

The push-pull box assembly 20 of this embodiment further includes a bracket plate 28 arranged in the box body 21, the box body 211 has a positioning support portion that is positioned and supported with the bracket plate 28, and the second circuit board 222 is fixedly connected to the bracket plate 28. By providing the support plate 28, the support plate 28 can cooperate with the positioning support portion of the box body 21 to complete the positioning support of the support plate 28 by the positioning support portion, thereby completing the positioning effect of the second circuit board 222 in the box body 21. It is also possible to position and support the second circuit board 222 and the positioning support part of the box body 211 to achieve a positioning effect.

In this embodiment, the support board 28 may be a sheet metal support, or a support board 28 made of other materials, or a control circuit board having control components corresponding to the probe assembly 26 and the pressure sensor assembly 27.

It can be understood that, for the sake of ease of processing and improvement of the compactness of the structure, the support plate 28 has a plate-like structure. In order to facilitate installation, the projection surface of the bracket board 28 covers the second circuit board 222, so that the bracket board 28 is matched with the positioning portion of the box body 211.

Of course, the bracket plate 28 may not be provided, and the jaw drive assembly 22 may be directly fixed to the bracket of the pressure sensor assembly 27 or directly fixed to the inner wall of the box body 21.

In order to ensure the structural stability of the installation space, to prevent the second circuit board 222 from squeezing the probe assembly 26 and the pressure sensor assembly 27, the support plate 28 is located on the side of the second circuit board 222 facing away from the box cover 212. The bracket plate 28 has a hollow avoiding portion for the push-pull box motor 221 and the claw clip transmission assembly 23 to pass through. That is, the support plate 28 can provide a supporting force away from the clamping part to the second circuit board 222, and effectively supports the second circuit board 222 when the syringe pump 100 is dropped or other sudden impacts to ensure the transmission of the jaws. The stability of the assembly 23 connecting the push-pull box motor 221 and the drive rod also prevents the second circuit board 222 from squeezing the probe assembly 26 and the pressure sensor assembly 27 to cause component damage.

Further, the claw clamp mechanism 25 further includes a transmission gear 252 that drives the two claw clamps 251 to move relative to each other. The transmission gear 252 is provided at the end of the drive rod extending into the box body 211. The jaw transmission assembly 23 includes a drive gear 231 driven by a push-pull box motor 221, and the drive gear 252 meshes with the drive gear 231. The axial directions of the transmission gear 252 and the drive gear 231 are arranged along the mounting direction of the claw drive assembly 22 to the box body 211, and the drive gear 252 meshes with the drive gear 231 when the claw drive assembly 22 is installed in position relative to the box body 211. The drive gear 231 is rotated by the push-pull box motor 221, and the drive gear 252 meshes with the drive gear 231. The drive gear 252 is driven by the drive gear 231 to realize the relative movement operation of the two jaws 251. When approaching, the clamping of the piston handle of the syringe 200 by the claw clamp mechanism 25 is completed; when the two claw clamps 251 move away from each other, the separation of the piston handle of the syringe 200 by the claw clamping mechanism 25 is completed.

For the convenience of installation, the axial directions of the transmission gear 252 and the drive gear 231 are arranged along the installation direction of the jaw drive assembly 22 to the box body 211. When the jaw drive assembly 22 is installed relative to the box body 211, the drive gear 252 and the drive The gear 231 meshes. That is, when the jaw drive assembly 22 is installed in the box body 211, the drive gear 231 on the jaw drive assembly 22 and the transmission gear 252 of the jaw mechanism 25 already installed on the box body 211 directly mesh with each other, which facilitates assembly.

In this embodiment, the transmission gear 252 and the drive gear 231 are spur gears. Through the above arrangement, the processing and assembly of the transmission gear 252 and the drive gear 231 are facilitated. When the jaw drive assembly 22 is installed, the transmission gear 252 and the drive gear 231 are axially parallel, and the transmission gear 252 and the drive gear 231 are close to each other, so that the straight teeth of the transmission gear 252 and the straight teeth of the drive gear 231 are directly inserted and fitted. The meshing of the straight teeth of the transmission gear 252 and the straight teeth of the drive gear 231 is completed. It should be noted that the claw clamping mechanism 25 of this embodiment further includes a driven gear 7 meshing with the transmission gear 252, and the driven gear 253 is also a spur gear.

In another embodiment, the driving gear 252 and the driving gear 231 are bevel gears, and the large diameter end of the driving gear 231 faces the second circuit board 222. For the convenience of installation, it is preferable that the large-diameter end of the drive gear 231 faces the second circuit board 222, so that when the jaw drive assembly 22 is installed in the box body 211, the small-diameter end of the drive gear 231 is first connected to the transmission gear 252 overlaps in the axial direction, which facilitates the meshing connection of the transmission gear 252 and the driving gear 231. It can be understood that if the driven gear 253 is also provided in this embodiment, the driven gear 7 is also a bevel gear.

In addition, when the push-pull box motor 221 is de-energized, the drive gear 231 of this embodiment can be driven by external force to rotate. In special circumstances (such as the emergency removal of the syringe 200 or a power failure), the drive gear 231 can be driven to rotate by external force when the push-pull box motor 221 is de-energized, so that the push-pull box motor 221 does not affect the rotation of the drive gear 231. The two claw clamps 251 can be opened manually. In the process of opening the two claw clamps 251, the transmission gear 252 rotates and drives the driving gear 231 to rotate. That is, the claw clamp 251 reversely drives the transmission gear 252, the driving gear 231, and the push-pull box motor 221 to rotate, and the transmission gear 252 and the driving gear 231 will not be in a self-locking state. Through the above arrangement, the claw clamp 251 can be manually opened in special circumstances to complete the separation and unlocking operation of the claw clamp mechanism 25 on the piston handle of the syringe 200, 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 assembly 20 is reduced, and the structure of the syringe pump 100 is simplified.

Referring to Figures 9 and 12, the hollow shaft 13 of this embodiment includes a shaft body 131 having a mounting channel 13a, and a sleeve 132 sleeved in the shaft body 131. The sleeve 132 divides the mounting channel 13a into a first sub Channel 13b and second sub-channel 13c. The syringe pump 100 also includes a cable 40 and a main board (not shown in the figure). The screw rod 141 passes through the first sub-channel 13b, the cable 40 passes through the second sub-channel 13c, and the push-pull box assembly 20 is connected to the main board through the cable 40.

Specifically, during use of the syringe pump 100 of this embodiment, corresponding signals need to be transmitted between the push-pull box assembly 20 and the main board. For example, the main board needs to transmit a control signal to the push-pull box motor 221 to open the jaw mechanism 251. During the injection process, the pressure sensor assembly 27 provided in the box 21 can detect the pressure in the barrel of the syringe 200, and transmit the detection signal to the main board, and the push-pull box assembly 20 is pushed through the cable 40 It is electrically connected to the main board to realize the transmission of these control signals and detection signals. Since the hollow shaft 13 of this embodiment is sleeved on the outside of the screw rod 141, and the cable 40 passes through the hollow shaft 13, a sleeve 132 is also provided in the hollow shaft 13 of this embodiment. 132 is sleeved in the shaft body 131, the screw rod 141 is inserted in the first sub-channel 13b, and the cable 40 is inserted in the second sub-channel 13c, that is, the cable 40 can be connected to the second sub-channel 13c through the sleeve 132. The screw rods 141 are separated to prevent the screw rod 141 from damaging the cable 40 during high-speed rotation. Those skilled in the art should know that the motherboard can use various existing chips with signal input and signal output as the control device, and can be controlled by electrical signal control or software control. The cable 40 can be a flexible flat cable ( FFC, Flexible flat cable), can also be other cables that can transmit electrical signals.

Specifically, during use of the syringe pump 100 of this embodiment, corresponding signals need to be transmitted between the push-pull box assembly 20 and the main board. For example, the main board needs to transmit a control signal to the push-pull box motor 221 to open and close the claw clamp 251. During the injection process, the pressure sensor assembly 27 set in the box 21 can detect the pressure in the barrel of the syringe 200, and transmit the detection signal to the main board, and the push-pull box assembly 20 and the main board are connected through a cable The electrical connection can realize the transmission of these control signals and detection signals. Since the hollow shaft 13 of this embodiment is sleeved on the outside of the screw rod 141, and the cable passes through the hollow shaft 13, a sleeve 132 is also provided in the hollow shaft 13 of this embodiment. It is sleeved in the shaft 131, the screw rod 141 is inserted in the first sub-channel 13b, and the cable 40 is inserted in the second sub-channel 13c, that is, the cable 40 can be connected to the wire through the sleeve 132. The rods 141 are separated to prevent the screw rod 141 from damaging the cable 40 during high-speed rotation. Those skilled in the art should know that the motherboard can use various existing chips with signal input and signal output as the control device, and can be controlled by electrical signal control or software control. The cable 40 can be a flexible flat cable ( FFC, Flexible flat cable), can also be other cables that can transmit electrical signals.

Please refer to FIGS. 1 to 15, the syringe pump 100 of one embodiment of the present application includes: a push-pull box assembly 20 and a pump body device 10. The pump body device 10 includes a base 11, a sliding assembly 12, a hollow shaft 13, a transmission assembly 14, a driving mechanism 15, a displacement monitoring element 18 and a first circuit board 17. The seat body 11 has an accommodating cavity 11a, and the sliding assembly 12 includes two parallel and spaced guide rods 121', and a sliding block 122' penetrating through the two guide rods 121'. The two guide rods 121' are arranged in the accommodating cavity 11a, and are plug-in-fitted with the base body 11. The hollow shaft 13 is arranged between the two guide rods 121 ′, one end of the hollow shaft 13 is connected to the sliding block 122 ′, and the end of the hollow shaft 13 away from the sliding block 122 ′ is connected to the push-pull box assembly 20. The driving mechanism 15 is arranged in the accommodating cavity 11a. The transmission assembly 14 includes a pulley mechanism 143. The pulley mechanism 143 includes a timing belt 1431, a primary gear 1432 and a secondary gear 1433, and is connected to the slider 122' in transmission and is connected to the hollow shaft 13 sets接的丝杆141。 Connected to the screw 141. The timing belt 1431, the primary gear 1432, and the secondary gear 1433 are arranged at an end of the seat body 11 away from the push-pull box assembly 20, and on the side of the seat body 11 away from the accommodating cavity 11a. One end of the screw rod 141 away from the push-pull box assembly 20 is fixedly connected with the secondary gear 1433, the secondary gear 1433 meshes with the primary gear 1432, and the primary gear 1432 is drivingly connected with the output shaft of the driving mechanism 15 through a timing belt 1431.

Driven by the drive mechanism 15, the transmission assembly 14 converts the rotary motion of the screw rod 141 into the linear motion of the slider 122', so that the slider 122' drives the push-pull box assembly 20 connected to the hollow shaft 13 relative to the base 11 Reciprocating motion. The first circuit board 17 is arranged at one end of the seat body 11 close to the push-pull box assembly 20, and is connected to the side wall of the seat body 11 away from the receiving cavity 11a, and along the axial direction of the guide rod 121', the projection of the two guide rods 121' Located within the projection range of the first circuit board 17. The displacement monitoring element 18 includes a strip-shaped long potentiometer 181 ′, and a plunger assembly 182 connected to the slider 122 ′ and having a contact 1821. The long potentiometer 181' includes a first section 1811', a second section 1812' connected to the first section 1811', and a resistor body 1813' arranged on the first section 1811' along the length direction of the long potentiometer 181'. The first section 1811' is arranged in the accommodating cavity 11a, and is connected with the side wall of the seat body 11 at the accommodating cavity 11a; the second section 1812' extends from the end of the seat body 11 where the first circuit board 17 is arranged to the accommodating cavity 11a outside; the second section 1812' is bent to the side where the first circuit board 17 is arranged, and is electrically connected to the first circuit board 17; the contact 1821 is in contact with the resistor 1813' to move the slider 122' Conduct monitoring.

The foregoing are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A syringe pump including:

Push-pull box assembly;

The pump body device includes: a seat body, a sliding component, a hollow shaft, a transmission component, a driving mechanism, a displacement monitoring element, and a first circuit board; the sliding component includes a first sliding part arranged on the seat body, and a first The second sliding part is slidably connected to the sliding part; the hollow shaft is connected to the second sliding part and the push-pull box assembly; the transmission assembly includes a screw rod that is drivingly connected to the second sliding part, and the screw rod and the first sliding part are arranged in parallel and spaced apart from the hollow shaft. Shaft sleeve connection; the driving mechanism is drivingly connected with the transmission assembly; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the screw rod into the linear motion of the second sliding part, so that the second sliding part drives the push-pull box connected with the hollow shaft The component reciprocates relative to the base body; the displacement monitoring element is arranged on one side of the base body and is electrically connected to the first circuit board to monitor the displacement of the second sliding member.
According to the injection pump of claim 1, the first sliding member is a guide rod, and the second sliding member is a sliding block penetrating the guide rod.
The syringe pump according to claim 2, wherein the seat body has a containing cavity, and a first positioning hole, a second positioning hole and a limiting hole respectively communicating with the containing cavity;

The first positioning hole is arranged on the side of the base body close to the push-pull box assembly;

The second positioning hole is arranged opposite to the first positioning hole, one end of the guide rod is inserted into the first positioning hole, and the end of the guide rod away from the first positioning hole is inserted into the second positioning hole;

The limiting hole is on the same side as the first positioning hole, and the hollow shaft is penetrated in the limiting hole.
According to the injection pump of claim 2 or 3, the number of the guide rods is two, and the first mounting hole and the second mounting hole are formed at intervals on the sliding block;

The projection of the first mounting hole in the axial direction is a closed hole, and the projection of the second mounting hole in the axial direction is a semi-closed hole. One of the two guide rods is inserted in the first mounting hole, and the other is inserted in the In the second mounting hole.
According to the injection pump of claim 2 or 3, the sliding assembly further comprises an oil-containing bush provided on the sliding block, and the sliding block is slidably connected to the guide rod through the oil-containing bushing.
According to the syringe pump of claim 3, the pump body device further comprises an optical coupler;

The first circuit board is arranged on the base and covers the side of the first positioning hole away from the accommodating cavity;

The optical coupler is electrically connected with the first circuit board.
According to the syringe pump of claim 6, the displacement monitoring element includes a potentiometer and a plunger assembly detachably connected to the second sliding member; the plunger assembly is in contact with the potentiometer.
The syringe pump according to claim 7, wherein the potentiometer is a strip-shaped long potentiometer, and the plunger assembly includes a contact;

The long potentiometer includes a first section, a second section connected to the first section, and a resistor body arranged on the first section along the length direction of the long potentiometer; the first section is arranged in the accommodating cavity and is located with the seat body The side wall at the accommodating cavity is connected; the second section extends out of the accommodating cavity from the end where the first circuit board is arranged on the base; the second section is bent to the side where the first circuit board is arranged, and is connected to the first circuit Board electrical connection;

The contact is in contact with the resistor body.
According to the syringe pump of any one of claims 1-3, the screw rod is threadedly connected with the second sliding member; or,

The transmission assembly also includes a nut which is matched with the screw rod, and the second sliding member is connected with the nut.
According to the syringe pump of claim 9, the second sliding member has a third mounting hole, and the nut is arranged in the third mounting hole and is threadedly connected with the second sliding member.
According to the injection pump of claim 9, the transmission assembly further comprises two bearings arranged adjacently on the seat body;

The end of the screw rod drivingly connected with the driving mechanism is penetrated in the two bearings, and the end of the screw rod away from the bearing is a free end.
The injection pump according to any one of claims 1 to 3, the transmission assembly further includes a pulley mechanism, the pulley mechanism including a timing belt, a primary gear and a secondary gear;

The output shaft of the driving mechanism is connected to the primary gear through a synchronous belt;

The first-stage gear meshes with the second-stage gear for transmission, and the second-stage gear is fixedly connected with the screw rod.
The syringe pump according to any one of claims 1 to 3, the push-pull box assembly includes: a box body, a probe assembly, a pressure sensor assembly, a jaw clamping mechanism and a jaw clamping drive assembly;

The pressure sensor assembly is arranged in the box body and stacked with the probe assembly;

The claw clamp mechanism has two claw clamps, the claw clamp includes a driving rod and a clamping part located outside the box body, the driving rod is located at one end of the clamping part and penetrates the box body;

The jaw drive assembly is arranged in the box; the jaw drive assembly includes a second circuit board, a push-pull box motor arranged on the second circuit board, and a jaw drive assembly connecting the push-pull box motor and the drive rod; push-pull box motor and jaw drive The component is located at one end of the second circuit board; a sensor installation space is formed between the suspended portion and the clamping portion of the second circuit board, and the stacking combination of the probe component and the pressure sensor component is located in the sensor installation space.
The syringe pump according to claim 13, wherein the box body includes a box body and a box cover, the claw clamp mechanism, the pressure sensor assembly, the probe assembly and the claw clamp drive assembly are sequentially installed in the box body, and the box cover is arranged on the box body;

The claw clamp mechanism also includes a transmission gear that drives the two claw clamps to move relative to each other, and the transmission gear is arranged at the end of the drive rod extending into the box body;

The jaw transmission assembly includes a drive gear driven by a push-pull box motor, and the drive gear meshes with the drive gear;

The axial directions of the transmission gear and the drive gear are arranged along the installation direction of the claw clamp drive assembly to the box body, and the transmission gear meshes with the drive gear when the claw clamp drive assembly is installed in position relative to the box body.
The syringe pump according to any one of claims 1 to 3, the hollow shaft includes a shaft body with a mounting channel, and a sleeve sleeved in the shaft body, and the sleeve divides the mounting channel into a first sub-channel and a second sub-channel ; Syringe pump also includes cable and main board;

The screw rod is threaded in the first sub-channel, the cable is threaded in the second sub-channel, and the push-pull box assembly is electrically connected to the main board through the cable.
According to the syringe pump according to any one of claims 1 to 3, the syringe pump further comprises a housing with an inner cavity, the push-pull box assembly is arranged outside the housing, and the pump body device is arranged in the inner cavity.
A syringe pump including:

Push-pull box assembly;

Pump body device, the pump body device includes: a seat body, a sliding component, a hollow shaft, a transmission component, a driving mechanism, a displacement monitoring element and a first circuit board; the seat body has a containing cavity, and the sliding component includes two parallel and spaced guide rods , And a slider passing through the two guide rods; the two guide rods are arranged in the accommodating cavity and mated with the seat; the hollow shaft is arranged between the two guide rods, and one end of the hollow shaft is connected to the slider The end of the hollow shaft away from the slider is connected to the push-pull box assembly; the drive mechanism is arranged in the accommodating cavity, the transmission assembly includes a pulley mechanism, the pulley mechanism includes a timing belt, a first-stage gear, a second-stage gear, and a transmission connected to the slider The screw rod sleeved with the hollow shaft; the timing belt, the first gear and the second gear are arranged at the end of the seat body away from the push-pull box assembly, and on the side of the seat body away from the accommodating cavity; the screw rod is far away from the end of the push-pull box assembly and two The first-stage gear is fixedly connected, the second-stage gear is meshed with the first-stage gear for transmission, and the first-stage gear and the output shaft of the driving mechanism are connected by a synchronous belt; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the screw rod into a straight line of the slider Move so that the sliding block drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base; the first circuit board is arranged at the end of the base close to the push-pull box assembly, and is connected to the side wall on the side of the base away from the accommodating cavity , Along the axis of the guide rod, the projections of the two guide rods are located within the projection range of the first circuit board; the displacement monitoring element includes a strip-shaped long potentiometer, and a plunger assembly connected to the slider and having a contact The long potentiometer includes a first section, a second section connected to the first section, and a resistor body arranged on the first section along the length direction of the long potentiometer; the first section is arranged in the accommodating cavity and is connected to the seat body The side wall at the accommodating cavity is connected; the second section extends from the end of the base where the first circuit board is provided to the outside of the accommodating cavity; the second section is bent toward the side where the first circuit board is provided, and is connected to the first circuit board. The circuit board is electrically connected; the contact is in contact with the resistor body to monitor the displacement of the slider.