syringe pump

Abstract

This application provides an injection pump, including a push-pull box assembly and a pump body device. The pump body device includes a base, a sliding assembly, a hollow shaft, a transmission assembly, a drive mechanism, a displacement monitoring element, and a first circuit board. The sliding assembly includes a first sliding member and a second sliding member. The hollow shaft connects the second sliding member and the push-pull box assembly. The transmission assembly includes a lead screw that is driven by the second sliding member, the lead screw being parallel and spaced apart from the first sliding member and sleeved with the hollow shaft. The drive mechanism is driven by the transmission assembly. Through the drive mechanism, the transmission assembly converts the rotational motion of the lead screw into the linear motion of the second sliding member, so that the second sliding member drives the push-pull box assembly connected to the hollow shaft to reciprocate relative to the base. The displacement monitoring element is disposed on one side of the base and electrically connected to the first circuit board to monitor the displacement of the second sliding member. The injection pump of this application has a compact structure, which is beneficial for miniaturizing the injection pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and particularly relates to an injection pump. BACKGROUND

[0002] The injection pump is a device for pushing the piston of a syringe to inject infusion, so as to realize high-precision, smooth and pulsation-free liquid transmission. The pump body device is one of the most critical components for realizing the above functions in the injection pump. Since a large number of components need to be arranged in the pump body device of the injection pump, in the related art, the structure of the pump body device is bulky and oversized, which is not conducive to the miniaturization of the injection pump. SUMMARY

[0003] Therefore, the embodiments of the present application aim to provide an injection pump with a relatively compact structure.

[0004] To achieve the above-mentioned purpose, one aspect of the embodiments of the present application provides an injection pump, comprising:

[0005] a push-pull box assembly;

[0006] a pump body device, the pump body device comprising 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 comprising a first sliding member arranged on the seat body and a second sliding member in sliding connection with the first sliding member; the hollow shaft connecting the second sliding member and the push-pull box assembly; the transmission assembly comprising a lead screw in transmission connection with the second sliding member, the lead screw being arranged in parallel and spaced apart from the first sliding member and sleeved with the hollow shaft; the driving mechanism being in driving connection with the transmission assembly; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the lead screw into the linear motion of the second sliding member, so as to drive the push-pull box assembly connected with the hollow shaft to reciprocate relative to the seat body; the displacement monitoring element being arranged on one side of the seat body and electrically connected with the first circuit board, so as to monitor the displacement of the second sliding member.

[0007] Another aspect of the embodiments of the present application further provides an injection pump, comprising:

[0008] a push-pull box assembly;

[0009] The pump body device comprises 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 seat body has a containing cavity; the sliding assembly comprises two parallel and spaced guide rods and a sliding block arranged on the two guide rods; the two guide rods are arranged in the containing cavity and are in plug-in fit with the seat body; the hollow shaft is arranged between the two guide rods, one end of the hollow shaft is connected with the sliding block, and the other end of the hollow shaft away from the sliding block is connected with the push-pull box assembly; the driving mechanism is arranged in the containing cavity; the transmission assembly comprises a belt pulley mechanism, the belt pulley mechanism comprises a synchronous belt, a primary gear, a secondary gear and a lead screw in transmission connection with the sliding block and sleeved with the hollow shaft; the synchronous belt, the primary gear and the secondary 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 containing cavity; one end of the lead screw away from the push-pull box assembly is fixedly connected with the secondary gear, the secondary gear is in meshing transmission with the primary gear, and the primary gear is in driving connection with the output shaft of the driving mechanism through the synchronous belt; through driving of the driving mechanism, the transmission assembly converts the rotary motion of the lead screw into the linear motion of the sliding block, so that the sliding block drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the seat body; the first circuit board is arranged at one end of the seat body close to the push-pull box assembly and is connected with the side wall of the seat body away from the containing cavity, the projections of the two guide rods are located in the projection range of the first circuit board along the axial direction of the guide rods; the displacement monitoring element comprises a strip-shaped long potentiometer and a plunger assembly connected with the sliding block and having a contact head; the long potentiometer comprises a first section, a second section connected with 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 containing cavity and is connected with the side wall of the seat body at the containing cavity; the second section extends out of the containing cavity from one end of the seat body provided with the first circuit board; the second section is bent to one side provided with the first circuit board and is electrically connected with the first circuit board; the contact head is in contact with the resistor body to monitor the displacement of the sliding block.

[0010] The injection pump of the embodiment of the application can greatly save the installation space in the seat body by sleeving the hollow shaft with the lead screw, so that the overall structure of the injection pump is more compact, and the miniaturization of the injection pump is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 FIG. 1 is a structural schematic view of a pump body device of an injection pump according to an embodiment of the application;

[0012] Figure 2Fig. 1 is a perspective view of a pump body device according to the present application; Figure 1 Fig. 2 is a structural schematic view of another perspective of the pump body device shown in Fig. 1;

[0013] Figure 3 Fig. 3 is a structural schematic view of still another perspective of the pump body device shown in Fig. 1; Figure 1

[0014] Figure 4 Fig. 4 is a structural schematic view of a seat body according to the present application; Figure 1

[0015] Figure 5 Fig. 5 is a structural schematic view of a plunger assembly according to the present application; Figure 1

[0016] Figure 6 Fig. 6 is a structural schematic view of another perspective of the plunger assembly shown in Fig. 5; Figure 1

[0017] Figure 7 Fig. 7 is an exploded view of the plunger assembly shown in Fig. 5; Figure 1

[0018] Figure 8 Fig. 8 is a structural schematic view of a long potentiometer according to the present application; Figure 1

[0019] Figure 9 Fig. 9 is a sectional view of a partial structure of the pump body device shown in Fig. 1; Figure 1

[0020] Figure 10 Fig. 10 is a schematic view of the cooperation of a screw groove of a screw rod and a screw tooth of a screw nut; Figure 9

[0021] Figure 11 Fig. 11 is a schematic view of the cooperation of a screw groove of another screw rod and a screw tooth of a screw nut;

[0022] Figure 12 Figure 1 Fig. 12 is a schematic view of the cooperation of the pump body device shown in Fig. 1 and a cable and a push-pull box assembly;

[0023] Figure 13 Figure 9 Fig. 13 is a schematic view of the cooperation of a claw clamp of the push-pull box assembly shown in Fig. 12 and a related structure in a box body;

[0024] Figure 14 Figure 13 Fig. 14 is an exploded view of the push-pull box assembly shown in Fig. 12;

[0025] Figure 15 Fig. 15 is a schematic view of the cooperation of the pump body device shown in Fig. 1 and the push-pull box assembly with a syringe pump and a syringe. Figure 12

[0026] BRIEF DESCRIPTION OF THE DRAWINGS​​​​​​​​​​​​

[0027] Injection pump 100; pump body device 10; seat body 11; containing cavity 11a; first positioning hole 11b; second positioning hole 11c; limiting hole 11d; sliding assembly 12; first slider 121, guide rod 121'; second slider 122, sliding block 122'; oil-containing bushing 123; first mounting hole 122'a; second mounting hole 122'b; third mounting hole 122'c; hollow shaft 13; mounting channel 13a; first sub-channel 13b; second sub-channel 13c; shaft body 131; sleeve 132; transmission assembly 14; screw rod 141, 141'; screw groove 141a, 141'a; nut 142; screw thread 142a; pulley mechanism 143; synchronous belt 1431; primary gear 1432; secondary gear 1433; bearing 144; gasket 145; driving mechanism 15; optical coupler 16; circuit board 17; displacement monitoring element 18; potentiometer 181, long potentiometer 181'; first section 1811'; second section 1812'; resistor body 1813'; plunger assembly 182; contact 1821; main body 1822; positioning column 1822a; mounting channel 1822b; abutting port 1822c; first threaded hole 1822d; spring 1823; buckle 1824; clamping leg 1824a; through hole 1824b; push-pull box assembly 20; box body 21; box body 211; box cover 212; claw clamp driving assembly 22; push-pull box motor 221; second circuit board 222; claw clamp transmission assembly 23; driving gear 231; claw clamp mechanism 25; claw clamp 251; transmission gear 252; driven gear 253; probe assembly 26; pressure sensor assembly 27; support plate 28; shell 30; cable 40; syringe 200. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the technical features in the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as the explanation and description of the purpose of the present application, and should not be regarded as improper limitation on the present application.

[0029] In the description of the present application, the "length direction" is based on the orientation or positional relationship shown in the drawings, and it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Figure 6

[0030] The present application provides an injection pump 100 for cooperating with a syringe 200 containing a liquid medicine to achieve high-precision, smooth and pulsation-free liquid transmission.

[0031] Please refer to Figures 1 to 4 ,​Figure 9 、 Figure 12 The injection pump 100 of the embodiment comprises a push-pull box assembly 20 and a pump body device 10. The pump body device 10 comprises a seat body 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 comprises a first sliding piece 121 arranged on the seat body 11 and a second sliding piece 122 in sliding connection with the first sliding piece 121. The hollow shaft 13 connects the second sliding piece 122 and the push-pull box assembly 20. The transmission assembly 14 comprises a screw rod 141 in transmission connection with the second sliding piece 122, the screw rod 141 is arranged in parallel and spaced apart from the first sliding piece 121 and is sleeved with the hollow shaft 13. The driving mechanism 15 is in driving connection with the transmission assembly 14. Through the driving of the driving mechanism 15, the transmission assembly 14 converts the rotary motion of the screw rod 141 into the linear motion of the second sliding piece 122, so that the second sliding piece 122 drives the push-pull box assembly 20 connected with the hollow shaft 13 to reciprocate relative to the seat body 11. The displacement monitoring element 18 is arranged on one side of the seat body 11 and is in electrical connection with the first circuit board 17 to monitor the displacement of the second sliding piece 122.

[0032] Specifically, please refer to Figure 15 The injection pump 100 of the embodiment further comprises a shell 30 with an inner cavity, the push-pull box assembly 20 is arranged outside the shell 30, and the pump body device 10 is arranged in the inner cavity. The shell 30 can protect the pump body device 10 and facilitate disinfection of the used injection pump 100. The driving mechanism 15 can be a stepping motor or other motor with driving function. The hollow shaft 13 is mainly used to connect the push-pull box assembly 20 and the second sliding piece 122, so that the second sliding piece 122 can drive the push-pull box assembly 20 to move synchronously during sliding, and thus the push-pull box assembly 20 can reciprocate relative to the seat body 11. The screw rod 141 mainly converts its rotary motion into the linear motion of the second sliding piece 122 by rotating, so that the second sliding piece 122 can slide relative to the first sliding piece 121.

[0033] In the related art, the push-pull box assembly is usually connected with the second sliding piece through a connecting shaft, and the connecting shaft is arranged in parallel and spaced apart from the screw rod, so that the connecting shaft and the screw rod need to occupy a large installation space in the seat body, and thus the volume of the pump body device is large.

[0034] In the embodiment, the connecting shaft is designed as the hollow shaft 13, which is sleeved with the screw rod 141 and connected with the second sliding piece 122. The screw rod 141 can rotate in the hollow shaft 13 to convert its rotary motion into the linear motion of the second sliding piece 122. Since the second sliding piece 122 can move along the axial direction of the screw rod 141 (i.e. the direction of the arrow A) under the driving of the driving mechanism 15, the second sliding piece 122 can drive the push-pull box assembly 20 to reciprocate relative to the seat body 11. Figure 1The second sliding member 122 can drive the push-pull box assembly 20 connected with the hollow shaft 13 to perform linear reciprocating motion along the axis of the screw rod 141. Compared with the connecting shafts arranged in parallel and spaced apart, the hollow shaft 13 sleeved with the screw rod 141 can greatly save the installation space, thereby making the structure of the pump body device 10 more compact, and further making the overall structure of the injection pump 100 more compact. The reciprocating motion in the present application refers to that when injection is needed, the push-pull box assembly 20 can drive the syringe 200 to move in the direction of injection under the driving of the second sliding member 122. After the injection is completed and the syringe 200 is removed from the injection pump 100, the push-pull box assembly 20 can be immediately driven by the second sliding member 122 to move in the opposite direction to reset the push-pull box assembly 20. Alternatively, the push-pull box assembly 20 can not be immediately reset, but can be driven by the second sliding member 122 to move in the opposite direction when the next injection is needed, and then the new syringe 200 can be clamped after the push-pull box assembly 20 is reset. That is, the reciprocating motion in the present application mainly refers to that the push-pull box assembly 20 can move in two opposite directions, and it is not required that the push-pull box assembly 20 must continuously move between the two opposite directions within a certain period of time.

[0035] Please refer to Figures 1 to 3 、 Figure 9 The transmission assembly 14 of the embodiment further includes a nut 142 matched with the screw rod 141, and the second sliding member 122 is connected with the nut 142.

[0036] Specifically, please refer to Figure 10 The screw rod 141 has a helical groove 141a, and the normal section shape of the helical groove 141a is arc-shaped. The nut 142 has a helical tooth 142a matched with the helical groove 141a. The nut 142 is arranged on the second sliding member 122. Through the driving of the driving mechanism 15, the rotational 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.

[0037] Specifically, in the related art, trapezoidal screw rods are generally used in injection pumps to convert the rotational motion of the trapezoidal screw rods into the linear motion of the second sliding member. However, the guiding accuracy of the trapezoidal screw rod is not high, which will adversely affect the use of the injection pump. In order to improve the guiding accuracy, some injection pumps use ball screw mechanisms to replace the trapezoidal screw rods. On the one hand, the cost of the ball screw mechanism is relatively high, and on the other hand, the ball screw mechanism has a relatively complex structure, so the volume of the ball screw mechanism is also relatively large, which needs to occupy a large installation space in the pump body device, thereby being not conducive to the miniaturization of the injection pump.

[0038] The normal cross-sectional shape of the screw groove 141a of the screw rod 141 is arc-shaped, and the tooth profile of the screw tooth 142a of the screw nut 142 matches the arc-shaped screw groove 141a, that is, the tooth profile of the screw tooth 142a of the screw nut 142 is actually arc-shaped. Compared with the trapezoidal screw rod, the guiding precision of the arc-shaped screw rod 141 of the present embodiment is higher, and can meet the use requirements of the injection pump 100. Compared with the ball screw mechanism, the arc-shaped screw rod 141 and the screw nut 142 of the present embodiment have lower cost and relatively smaller installation space, which is conducive to the miniaturization of the injection pump 100 while reducing the production cost of the injection pump 100.

[0039] The normal cross-sectional shape of the screw groove 141a of the present embodiment is double-arc-shaped, and the tooth profile of the screw tooth 142a is semicircular. The contact angle β of the screw groove 141a and the screw tooth 142a can be set as needed, and preferably, the contact angle β of the screw groove 141a and the screw tooth 142a (the angle between the normal line of the tangent point of the screw groove 141a and the screw tooth 142a and the vertical line perpendicular to the axis of the screw rod 141) is 45°. It can be understood that the screw groove 141a can also be other arc-shaped structures, for example, please refer to Figure 11 , the normal cross-sectional shape of the screw groove 141a of the screw rod 141' can also be elliptical. In other embodiments, the normal cross-sectional shape of the screw groove 141a can also be single-arc-shaped, etc. According to the different normal cross-sectional shapes of the screw groove 141a matched with the screw tooth 142a, the tooth profile of the screw tooth 142a can also be other arc-shaped structures, such as single-arc-shaped, elliptical, double-arc-shaped, etc. in addition to semicircular.

[0040] Please refer to Figure 9 , the second sliding member 122 of the present embodiment has a third mounting hole 122'c, the screw nut 142 is arranged in the third mounting hole 122'c and is threadedly connected with the second sliding member 122, and the end of the hollow shaft 13 close to the screw nut 142 is also inserted into the third mounting hole 122'c. That is, the screw nut 142 is arranged inside the second sliding member 122, thereby saving the installation space of the screw nut 142, and the screw nut 142 is threadedly connected with the second sliding member 122, thereby facilitating the disassembly and assembly of the second sliding member 122 and the screw nut 142. Through the driving of the driving mechanism 15, the rotational motion of the screw rod 141 can be converted into the linear motion of the screw nut 142, so that the screw nut 142 can drive the second sliding member 122 connected therewith to slide relative to the first sliding member 121.

[0041] In the related art, there is an injection pump that adopts a mode of cooperation between a lead screw and a clutch nut to realize transmission to the second sliding member, and the lead screw and the clutch nut can be separated. In the use process of this injection pump, through cooperation between the driving mechanism and the transmission assembly, only the push-pull box assembly can be driven to push the syringe to move in the injection direction. When the injection is completed and the push-pull box assembly needs to be reset, the operator needs to manually separate the lead screw and the clutch nut, and then manually pull the push-pull box assembly back in the opposite direction. That is to say, the operation of this injection pump is actually a semi-manual operation mode. The push-pull box assembly is driven to move by the driving mechanism during injection, and the push-pull box assembly is manually pulled back during reset.

[0042] However, the lead screw 141 and the nut 142 of the pump body device 10 of the embodiment cannot be separated, and under the driving of the driving mechanism 15, the nut 142 can perform linear reciprocating motion along the lead screw 141. Therefore, the push-pull box assembly 20 connected with the second sliding member 122 through the hollow shaft 13 can be controlled by electricity to move in the direction of pushing the syringe 200 to the injection direction or to reset, so that manual operation can be avoided. In addition, when the push-pull box assembly 20 is reset, the lead screw 141 and the nut 142 do not need to be separated manually, so that the corresponding mechanical structure for separating the lead screw 141 and the nut 142 is not needed, thereby further saving the installation space, and the structure of the transmission assembly 14 of the embodiment is simpler, and the overall structure of the pump body device 10 is more compact. In another embodiment, the lead screw 141 can also be a ball screw, that is, a ball is arranged between the lead screw 141 and the nut 142, or the nut 142 can not be arranged, and the lead screw 141 is directly threadedly connected with the second sliding member 122. As long as the rotation of the lead screw 141 or the cooperation between the lead screw 141 and other intermediate parts can convert the rotation of the lead screw 141 into the linear motion of the second sliding member 122.

[0043] Please refer to Figure 9 The transmission assembly 14 of the embodiment further comprises two bearings 144 arranged adjacent to each other on the seat body 11. One end of the lead screw 141 driven and connected with the driving mechanism 15 is arranged in the two bearings 144, and the other end of the lead screw 141 away from the bearings 144 is a free end.

[0044] In the related art, the lead screw of the injection pump is mostly supported at one end by a bearing, and the other end of the lead screw away from the bearing is matched with a copper bushing as a rotary support. However, the installation precision of this setting mode is poor, there is a risk of pump jamming, and in the process of rotation of the lead screw, the other end of the lead screw away from the bearing has a large noise, the copper bushing is severely worn, and thus there is a certain safety risk.

[0045] The end of the lead screw 141 driven by the driving mechanism 15 in the embodiment is supported by two bearings 144. More specifically, the bearings 144 in the embodiment are deep groove ball bearings, and a gasket 145 is arranged between the two deep groove ball bearings. The end of the lead screw 141 away from the bearings 144 is not provided with a support structure. Since the two bearings 144 can bear a large axial force, the stability of high-speed movement can be ensured without providing a support structure at the end of the lead screw 141 away from the bearings 144. Since the end of the lead screw 141 away from the bearings 144 does not need to be provided with a copper sleeve or other support structure, the movement noise of the lead screw 141 during rotation can be reduced, and the risk of pump jamming and wear of the support structure is eliminated, thereby greatly improving the safety of the injection pump 100.

[0046] It can be understood that in other embodiments, the bearings 144 can also be angular contact bearings, and the two angular contact bearings can be installed in a back-to-back DB manner or in a face-to-face DF manner. In other embodiments, only one bearing 144 can be provided at one end of the lead screw 141, or more than two bearings 144 can be provided, or one or more bearings 144 can be provided at both ends of the lead screw 141.

[0047] Please continue to refer to Figures 1 to 3 、 Figure 9 The first sliding member 121 in the embodiment is a guide rod 121', and the second sliding member 122 is a sliding block 122' arranged on the guide rod 121'. The sliding block 122' can slide along the guide rod 121'.

[0048] Specifically, the seat body 11 has a receiving cavity 11a, and a first positioning hole 11b, a second positioning hole 11c, and a limiting hole 11d which are in communication with the receiving cavity 11a. The first positioning hole 11b is arranged on the side of the seat body 11 close to the push-pull box assembly 20. The second positioning hole 11c is arranged 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' away from the first positioning hole 11b is inserted into the second positioning hole, that is, the guide rod 121' in the embodiment is inserted into the seat body 11. Since two guide rods 121' are arranged in the embodiment, two first positioning holes 11b and two second positioning holes 11c are arranged 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 is arranged in the limiting hole 11d. The hollow shaft 13 can reciprocate along the axis of the limiting hole 11d under the driving of the sliding block 122'. The limiting hole 11d can guide the hollow shaft 13, so that the hollow shaft 13 can move more stably during reciprocation.

[0049] Further, the slider 122' is formed with a first mounting hole 122'a and a second mounting hole 122'b which are arranged at intervals. The axial projection of the first mounting hole 122'a is a closed hole, and the axial projection of the second mounting hole 122'b is a semi-closed hole. One of the two guide rods 121' is arranged in the first mounting hole 122'a, and the other is arranged in the second mounting hole 122'b. That is, the sliding assembly 12 of the present embodiment is a double-guide-rod and slider 122' combination. Please refer to Figure 9 The "axial projection of the first mounting hole 122'a is a closed hole" mainly refers to that at least one side wall of the first mounting hole 122'a is a ring-shaped closed structure, so that the guide rod 121' arranged in the first mounting hole 122'a can be constrained in the radial direction. The "axial projection of the second mounting hole 122'b is a semi-closed hole" mainly refers to that at least one side wall of the second mounting hole 122'b is provided with an axial notch, so that the guide rod 121' arranged in the second mounting hole 122'b can have a certain amount of radial deviation. That is, the second mounting hole 122'b can provide a certain amount of adjustment for the slider 122' in the direction perpendicular to the guide rod 121', so as 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' can be one or more than two. The cross-sectional shape of the guide rod 121' is not limited, such as a circular, triangular, rectangular, irregular shape, etc., as long as the guide rod 121' can cooperate with the slider 122'.

[0050] In other embodiments, the first sliding member 121 can also be a sliding groove, and the second sliding member 122 is a guide block cooperating with the sliding groove, or the first sliding member 121 can also be a guide rail, and the second sliding member 122 is a guide seat with a guide wheel, as long as the first sliding member 121 and the second sliding member 122 can cooperate with each other.

[0051] In the related art, in order to ensure smooth movement of the slider, some pump body devices need to apply a certain amount of lubricant or lubricating grease on the slider and / or guide rod. However, the excess lubricant or lubricating grease will fall into other structures of the pump body device during the sliding process of the slider. Some pump body devices select a plastic slider to meet the sliding requirement through self-lubrication of the slider. Although the slider does not need to be coated with lubricant or lubricating grease, the guiding accuracy is relatively poor.

[0052] In order to solve the above problems, please refer to Figure 9The sliding assembly 12 of the embodiment further comprises oil-containing bushings 123 arranged on the sliding block 122', and the sliding block 122' is in sliding connection with the guide rods 121' through the oil-containing bushings 123. That is, one oil-containing bushing 123 is arranged in each of the first mounting hole 122'a and the second mounting hole 122'b, and the two guide rods 121' are actually arranged in the corresponding oil-containing bushings 123 and in sliding connection with the oil-containing bushings 123. Meanwhile, in order to ensure that the sliding block 122' arranged on the guide rods 121' has a certain adjustment allowance, when the oil-containing bushings 123 are installed, one oil-containing bushing 123 is in interference fit with the first mounting hole 122'a, 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 open a degree of freedom in a direction perpendicular to the guide rods 121', that is, the oil-containing bushing 123 arranged in the second mounting hole 122'b can be offset in the radial direction of the guide rods 121' in the second mounting hole 122'b, but will not be detached from the second mounting hole 122'b. Since the oil-containing bushing 123 has good self-lubricating property and high guiding accuracy, the sliding block 122' and the guide rods 121' do not need to be lubricated by lubricant or lubricating grease to ensure smooth movement of the sliding block 122', which can avoid the lubricant or lubricating grease from falling into other structures of the pump body device 10 to contaminate the pump body device 10, and at the same time, can ensure that the guiding accuracy of the sliding block 122' meets the use requirements of the injection pump 100. In addition, please refer to Figure 1 The limiting hole 11d of the embodiment actually also has an oil-containing bushing 123 arranged therein, and the hollow shaft 13 is arranged in the oil-containing bushing 123 in the limiting hole 11d and can slide relative to the oil-containing bushing 123, 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 can also not have the oil-containing bushing 123 arranged therein.

[0053] Please continue to refer to Figure 1 and Figure 4 The pump body device 10 of the embodiment further comprises an optical coupler 16, and the first circuit board 17 is arranged on the seat body 11 and covers the side of the first positioning hole 11b away from the accommodating cavity 11a. The optical coupler 16 is in electrical connection with the first circuit board 17.

[0054] Specifically, the light coupler 16 is mainly used for detecting the starting position of the push-pull box assembly 20 and transmitting the detection signal to the first circuit board 17. Since one end of the guide rod 121' in the embodiment is fixed in the first positioning hole 11b by means of insertion, and the first circuit board 17 is actually arranged on the side wall of the seat body 11 and covers the side of the first positioning hole 11b away from the accommodation cavity 11a, the first circuit board 17 can stop and position the guide rod 121' when the first positioning hole 11b fails due to accidental circumstances, so as to prevent the normal use of the injection pump 100 from being affected by the guide rod 121' sliding out of the first positioning hole 11b during use. It should be noted that the coverage described in the present application means that the first circuit board 17 can block the two first positioning holes 11b from the direction facing the first circuit board 17, 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 can be a certain gap between the first circuit board 17 and the first positioning hole 11b.

[0055] In the related art, multiple circuit boards are usually arranged in the accommodation cavity of the seat body, the detection element for detecting the starting position of the push-pull box assembly is electrically connected with one circuit board, and the displacement monitoring element for monitoring the displacement of the second sliding member is electrically connected with another circuit board. Since multiple circuit boards are arranged in the accommodation cavity, these circuit boards occupy a large installation space in the accommodation cavity. In the embodiment, the displacement monitoring element 18 and the light coupler 16 share the same first circuit board 17, and the first circuit board 17 is arranged on the outer side wall of the seat body 11 instead of being arranged in the accommodation cavity 11a. Therefore, this arrangement reduces the total number of circuit boards and does not occupy the installation space of the accommodation cavity 11a, thereby ensuring that the overall structure of the pump body device 10 can be more compact.

[0056] Please refer to Figures 1 to 3 、 Figure 5 The displacement monitoring element 18 in the embodiment includes a potentiometer 181 and a plunger assembly 182 detachably connected with the second sliding member 122. The plunger assembly 182 is in contact with the potentiometer 181 to monitor the displacement of the sliding block 122'.

[0057] Specifically, during use of the injection pump, the position of the sliding block 122' needs to be monitored at all times. In the related art, the displacement of the sliding block 122' is mostly monitored by using a sliding wire type. This monitoring method usually requires the use of a linear displacement sensor. Since the linear displacement sensor has a relatively large volume, it also needs to occupy a large installation space. In the embodiment, the displacement of the sliding block 122' is monitored by using the potentiometer 181 and the plunger assembly 182. More specifically, please refer to Figure 6, the potentiometer 181 is a strip-shaped long potentiometer 181', which includes a first section 1811', a second section 1812' connected with 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 connected with the side wall of the seat body 11 at the accommodating cavity 11a; the second section 1812' extends out of the accommodating cavity 11a from the end of the seat body 11 where the first circuit board 17 is arranged. The second section 1812' is bent towards the side where the first circuit board 17 is arranged and electrically connected with the first circuit board 17. The contact 1821 is in contact with the resistor body 1813'. During the sliding of the slider 122', the plunger assembly 182 mounted on the slider 122' slides together with the slider 122', and the contact 1821 in the plunger assembly 182 always keeps in contact with the resistor body 1813' of the long potentiometer 181', according to the different contact positions of the contact 1821 and the resistor body 1813', the long potentiometer 181' can transmit corresponding monitoring signals 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 simple structure and small volume, it does not need to occupy too much installation space, so the overall structure of the pump body device 10 of the embodiment can be more compact.

[0058] The resistor body 1813' of the 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, so that the second section 1812' of the long potentiometer 181' can be bent during assembly, or it can be directly prefabricated Figure 1 in the shape as shown.

[0059] Please refer to Figures 5 to 7The plunger assembly 182 of the embodiment mainly comprises a contact 1821, a main body 1822, a positioning column 1822a, a mounting channel 1822b, a spring 1823 and a buckle 1824. The main body 1822 is formed with the positioning column 1822a, the mounting channel 1822b, an abutting portion 1822c and a threaded hole 1822d. The abutting portion 1822c is arranged along the radial direction of the mounting channel 1822b and communicates with the mounting channel 1822b. The axis of the threaded hole 1822d is parallel to the axis of the positioning column 1822a. The buckle 1824 is formed with a through hole 1824a and two clamping legs 1824a arranged on both sides of the axis of the through hole 1824a. When assembling the plunger assembly 182, first, the contact 1821 is inserted into the mounting channel 1822b. A part of the structure of the contact 1821 (i.e. the end in contact with the resistor body 1813') penetrates through the mounting channel 1822b and extends out of the mounting channel 1822b. Then, a part of the structure of the spring 1823 is inserted into the mounting channel 1822b and is sleeved on the contact 1821. Another part of the structure of the spring 1823 is located outside the mounting channel 1822b. Finally, the two clamping legs 1824a of the buckle 1824 are directed towards the mounting channel 1822b. The buckle 1824 is inserted into the mounting channel 1822b. The structure of the spring 1823 located outside the mounting channel 1822b penetrates through the through hole 1824b on the buckle 1824. By rotating the buckle 1824, the two clamping legs 1824a on the buckle 1824 abut against the sidewall of the main body 1822 at the abutting portion 1822c. When disassembling the plunger assembly 182, only need to rotate the buckle 1824 to a non-abutting position, and then take out the buckle 1824, the spring 1823 and the contact 1821 from the mounting channel 1822b. When it is needed to install the plunger assembly 182 on the slider 122', the positioning column 1822a on the main body 1822 is inserted into the positioning groove (not shown in the figure) formed on the slider 122'. The end of the spring 1823 located outside the mounting channel 1822b abuts against the slider 122'. The first threaded hole 1822d is aligned with the second threaded hole (not shown in the figure) formed on the slider 122'. A screw is screwed into the first threaded hole 1822d and the second threaded hole, so as to fasten the plunger assembly 182 on the slider 122'. That is, the plunger assembly 182 of the embodiment is a detachable structure. The plunger assembly 182 and the slider 122' are detachably connected together. Thus, when it is needed to replace the plunger assembly 182, the plunger assembly 182 can be easily disassembled. When the parts of the plunger assembly 182 are damaged, the corresponding parts can be quickly replaced manually without using tools.

[0060] Please refer to Figures 1 to 3The transmission assembly 14 of the embodiment further comprises a pulley mechanism 143, which comprises a synchronous belt 1431, a primary gear 1432 and a secondary gear 1433. The output shaft of the driving mechanism 15 is drivingly connected to the primary gear 1432 through the synchronous belt 1431; the primary gear 1432 is in meshing transmission with the secondary gear 1433, and the secondary gear 1433 is fixedly connected to the lead screw 141.

[0061] Specifically, in the related art, a gear assembly is mostly needed to be used for transmission between the driving mechanism and the lead screw, the gear assembly is directly drivingly connected to the driving mechanism, and the driving mechanism drives the lead screw to rotate through the gear assembly. The gear assembly is provided to not only ensure that the output of the torque of the driving mechanism is amplified, but also ensure that the rotation speed of the lead screw meets the requirements. However, in the process of rapid loading, the driving mechanism needs to be operated at high speed, and the conventional gear assembly not only brings huge noise in the process of rotation, but also sharply reduces the service life of the driving mechanism and the gear assembly, in addition, the connection mode has no overload protection, and accidents are prone to occur.

[0062] The pulley mechanism 143 of the embodiment is a two-stage transmission structure, the first stage is synchronous pulley transmission, that is, the output shaft of the driving mechanism 15 is drivingly connected to the primary gear 1432 through the synchronous belt 1431, instead of directly drivingly connecting the output shaft of the driving mechanism 15 to the primary gear 1432, and the second stage is meshing transmission between the primary gear 1432 and the secondary gear 1433. The structure of the synchronous pulley can ensure the accurate transmission of the output rotation number of the driving mechanism 15, at the same time, the synchronous belt 1431 can provide overload protection for the driving mechanism 15, and the elasticity of the synchronous belt 1431 itself can also reduce the transmission noise, so that the transmission assembly 14 of the embodiment not only has the noise reduction function, but also improves the safety of the injection pump 100. It can be understood that in other embodiments, a conventional gear mechanism without a synchronous belt can also be used to replace the pulley mechanism 143.

[0063] Please refer to Figures 12 to 14The push-pull box assembly 20 of the embodiment comprises a box body 21, a probe assembly 26, a pressure sensor assembly 27, a claw clamp mechanism 25 and a claw clamp driving assembly 22. The pressure sensor assembly 27 is arranged in the box body 21 and is arranged in a stack with the probe assembly 26. The claw clamp mechanism 25 has two claw clamps 251, each of which comprises a driving rod and a clamping portion located outside the box body 21. The driving rod is located at one end of the clamping portion and penetrates through the box body 21. The claw clamp driving assembly 22 is arranged in the box body 21. The claw clamp driving assembly 22 comprises a second circuit board 222, a push-pull box motor 221 arranged on the second circuit board 222 and a claw clamp transmission assembly 23 connecting the push-pull box motor 221 and the driving rod. The push-pull box motor 221 and the claw clamp transmission assembly 23 are located at one end of the second circuit board 222. A sensor mounting space is formed between the overhanging portion of the second circuit board 222 and the clamping portion, and the stacked combination of the probe assembly 26 and the pressure sensor assembly 27 is located in the sensor mounting space.

[0064] The injection pump 100 of the embodiment connects the push-pull box motor 221 and the driving rod through the claw clamp transmission assembly 23, realizes the connection, forms a solid structure supported between the second circuit board 222 and the clamping portion with the claw clamp transmission assembly 23, the push-pull box motor 221 and the driving rod, and the solid structure is located at one end of the second circuit board 222. This makes the part of the second circuit board 222 where the push-pull box motor 221 and the claw clamp transmission assembly 23 are not arranged be arranged in suspension relative to the clamping portion, i.e., the overhanging portion of the second circuit board 222. A sensor mounting space is formed between the overhanging portion of the second circuit board 222 and the clamping portion, and the stacked combination of the probe assembly 26 and the pressure sensor assembly 27 is located in the sensor mounting space. Through the above arrangement, the space between the second circuit board 222 and the clamping portion is reasonably utilized, the probe assembly 26 and the pressure sensor assembly 27 do not occupy additional space in the push-pull box assembly 20, the structural compactness of the internal components of the push-pull box assembly 20 is effectively improved, and the overall volume of the push-pull box assembly 20 is reduced.

[0065] In the embodiment, the box body 21 comprises a box body 211 and a box cover 212. The claw clamp mechanism 25, the pressure sensor assembly 27, the probe assembly 26 and the claw clamp driving 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 clamp mechanism 25, the pressure sensor assembly 27, the probe assembly 26 and the claw clamp driving assembly 22 are sequentially installed in the box body 211 through the opening, and after the box cover 212 is arranged on the box body 211, the part of the claw clamp driving assembly 22 closest to the box cover 212 among the claw clamp mechanism 25, the pressure sensor assembly 27, the probe assembly 26 and the claw clamp driving assembly 22. Among them, the box body 211 and the box cover 212 are preferably detachably connected, such as through screw connection or through buckle connection, etc.

[0066] The claw clamping mechanism 25, the pressure sensor assembly 27, the probe assembly 26 and the claw clamping driving assembly 22 can be assembled together outside the box body 21 and then installed in the box body 21.

[0067] The push-pull box assembly 20 of the embodiment further comprises a support plate 28 arranged in the box body 21. The box body 211 has a positioning support part for positioning and supporting the support plate 28, and the second circuit board 222 is fixedly connected with the support plate 28. By arranging the support plate 28, the support plate 28 can cooperate with the positioning support part of the box body 21 to complete the positioning and supporting of the positioning support part on the support plate 28, and further complete the positioning effect of the second circuit board 222 in the box body 21. The positioning effect can also be achieved by positioning and supporting the positioning support part of the box body 211 with the second circuit board 222.

[0068] In the embodiment, the support plate 28 can be a sheet metal support, a support plate 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.

[0069] It can be understood that the support plate 28 is in a plate structure for the convenience of processing and improving the compactness of the structure. In order to facilitate installation, the projection surface of the support plate 28 covers the second circuit board 222, so that the support plate 28 cooperates with the positioning part of the box body 211.

[0070] Of course, the support plate 28 can also not be arranged, and the claw clamping driving assembly 22 can be directly fixed on the support of the pressure sensor assembly 27 or directly fixed on the inner wall of the box body 21.

[0071] In order to ensure the structural stability of the installation space and avoid the second circuit board 222 pressing 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 away from the box cover 212. The support plate 28 has a hollow avoiding part for the push-pull box motor 221 and the claw clamping driving assembly 23 to pass through. That is, the support plate 28 can provide a support force for the second circuit board 222 away from the clamping part. When the injection pump 100 falls or is subjected to other sudden impact, the second circuit board 222 is effectively supported, the stability of the connection between the claw clamping driving assembly 23 and the push-pull box motor 221 and the driving rod is ensured, and the damage of the second circuit board 222 pressing the probe assembly 26 and the pressure sensor assembly 27 is avoided.

[0072] Further, the claw mechanism 25 further comprises a transmission gear 252 for driving the relative movement of the two claws 251, the transmission gear 252 is arranged at the end of the driving rod extending into the box body 211. The claw driving assembly 23 comprises a driving gear 231 driven by the push-pull box motor 221, the transmission gear 252 is engaged with the driving gear 231. The axial direction of the transmission gear 252 and the driving gear 231 is arranged along the installation direction of the claw driving assembly 22 to the box body 211, when the claw driving assembly 22 is installed in place relative to the box body 211, the transmission gear 252 is engaged with the driving gear 231. By rotating the driving gear 231 through the push-pull box motor 221, and the transmission gear 252 is engaged with the driving gear 231, the transmission gear 252 is driven by the driving gear 231 to realize the relative movement of the two claws 251, when the two claws 251 are close to each other, the claw mechanism 25 clamps the piston handle of the syringe 200 is completed; when the two claws 251 are away from each other, the claw mechanism 25 separates the piston handle of the syringe 200 is completed.

[0073] For the convenience of installation, the axial direction of the transmission gear 252 and the driving gear 231 is arranged along the installation direction of the claw driving assembly 22 to the box body 211, when the claw driving assembly 22 is installed in place relative to the box body 211, the transmission gear 252 is engaged with the driving gear 231. That is, when the claw driving assembly 22 is installed into the box body 211, the driving gear 231 on the claw driving assembly 22 is directly engaged with the transmission gear 252 of the claw mechanism 25 already installed on the box body 211, which facilitates assembly.

[0074] In the embodiment, the transmission gear 252 and the driving gear 231 are spur gears. Through the above arrangement, the machining and assembly of the transmission gear 252 and the driving gear 231 are facilitated. When the claw driving assembly 22 is installed, the axial direction of the transmission gear 252 and the driving gear 231 is parallel, and the transmission gear 252 and the driving gear 231 are close to each other, so that the straight teeth of the transmission gear 252 and the straight teeth of the driving gear 231 are directly inserted and matched, and the engagement of the straight teeth of the transmission gear 252 and the straight teeth of the driving gear 231 is completed. It should be noted that the claw mechanism 25 of the embodiment further comprises a driven gear 253 engaged with the transmission gear 252, the driven gear 253 is also a spur gear.

[0075] In another embodiment, the transmission gear 252 and the drive gear 231 are bevel gears, and the large-diameter end of the drive gear 231 faces the second circuit board 222. For the sake of installation convenience, the large-diameter end of the drive gear 231 is preferably directed towards the second circuit board 222, so that when the claw clamp driving assembly 22 is installed in the box body 211, the small-diameter end of the drive gear 231 first axially coincides with the transmission gear 252, facilitating the meshing connection of the transmission gear 252 and the drive 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.

[0076] In addition, the drive gear 231 of the present embodiment can be driven to rotate by external force in the case of power failure of the push-pull box motor 221. In special cases (such as the case of needing to urgently remove the syringe 200 or power failure), since the drive gear 231 can be driven to rotate by external force in the case of power failure of the push-pull box motor 221, the push-pull box motor 221 does not affect the rotation of the drive gear 231, and the two claw clamps 251 can be directly manually pried open. In the process of prying open the two claw clamps 251, the transmission gear 252 rotates and drives the drive gear 231 to rotate. That is, the claw clamp 251 reversely drives the transmission gear 252, the drive gear 231 and the push-pull box motor 221 to rotate, and the transmission gear 252 and the drive gear 231 will not appear in the self-locking state. Through the above setting, the claw clamp mechanism 25 can directly manually pry open the claw clamp 251 to complete the separation and unlocking operation of the piston handle of the syringe 200 in special cases, which is convenient to operate and shortens the unlocking time; and there is no need to separately provide an unlocking structure, effectively reducing the volume of the push-pull box assembly 20 and simplifying the structure of the syringe pump 100.

[0077] Please refer to Figure 9 and Figure 12 The hollow shaft 13 of the present embodiment includes a shaft body 131 having a mounting passage 13a, and a sleeve 132 sleeved in the shaft body 131, the sleeve 132 separates the mounting passage 13a into a first sub-passage 13b and a second sub-passage 13c. The syringe pump 100 further includes a cable 40 and a main board (not shown in the figure). The lead screw 141 is arranged in the first sub-passage 13b, the cable 40 is arranged in the second sub-passage 13c, and the push-pull box assembly 20 is connected through the cable 40 and the main board.

[0078] Specifically, the injection pump 100 of the embodiment needs to transmit corresponding signals between the push-pull box assembly 20 and the mainboard during use. For example, the mainboard needs to transmit a control signal to the push-pull box motor 221 to control the opening and closing of the claw clamp mechanism 251. During the injection process, the pressure sensor assembly 27 arranged in the box body 21 can detect the pressure in the syringe 200 barrel and transmit the detection signal to the mainboard. The push-pull box assembly 20 and the mainboard are electrically connected through the cable 40, so that the transmission of the control signal, the detection signal and the like can be realized. Since the hollow shaft 13 of the embodiment is sleeved on the outside of the lead screw 141, and the cable 40 passes through the hollow shaft 13, the sleeve 132 is further arranged in the hollow shaft 13. The sleeve 132 is sleeved in the shaft body 131, the lead screw 141 is arranged in the first sub-channel 13b, and the cable 40 is arranged in the second sub-channel 13c. That is, the sleeve 132 can separate the cable 40 from the lead screw 141 to prevent damage to the cable 40 caused by the high-speed rotation of the lead screw 141. Those skilled in the art should know that the mainboard can use various existing chips with signal input and signal output as control devices, and can use electrical signal control or software control for control. The cable 40 can be a flexible flat cable (FFC, Flexible flat cable), or other cables capable of transmitting electrical signals.

[0079] Specifically, the injection pump 100 of the embodiment needs to transmit corresponding signals between the push-pull box assembly 20 and the mainboard during use. For example, the mainboard needs to transmit a control signal to the push-pull box motor 221 to control the opening and closing of the claw clamp mechanism 251. During the injection process, the pressure sensor assembly 27 arranged in the box body 21 can detect the pressure in the syringe 200 barrel and transmit the detection signal to the mainboard. The push-pull box assembly 20 and the mainboard are electrically connected through the cable 40, so that the transmission of the control signal, the detection signal and the like can be realized. Since the hollow shaft 13 of the embodiment is sleeved on the outside of the lead screw 141, and the cable 40 passes through the hollow shaft 13, the sleeve 132 is further arranged in the hollow shaft 13. The sleeve 132 is sleeved in the shaft body 131, the lead screw 141 is arranged in the first sub-channel 13b, and the cable 40 is arranged in the second sub-channel 13c. That is, the sleeve 132 can separate the cable 40 from the lead screw 141 to prevent damage to the cable 40 caused by the high-speed rotation of the lead screw 141. Those skilled in the art should know that the mainboard can use various existing chips with signal input and signal output as control devices, and can use electrical signal control or software control for control. The cable 40 can be a flexible flat cable (FFC, Flexible flat cable), or other cables capable of transmitting electrical signals.

[0080] Please refer to Figures 1 to 15 The injection pump 100 of one of the embodiments of the present application comprises a push-pull box assembly 20 and a pump body device 10. The pump body device 10 comprises a seat body 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 a receiving cavity 11a, the sliding assembly 12 comprises two parallel and spaced guide rods 121' and a sliding block 122' arranged on the two guide rods 121'. The two guide rods 121' are arranged in the receiving cavity 11a and are in plug-in connection with the seat body 11. The hollow shaft 13 is arranged between the two guide rods 121', one end of the hollow shaft 13 is connected with the sliding block 122', and the other end of the hollow shaft 13 away from the sliding block 122' is connected with the push-pull box assembly 20. The driving mechanism 15 is arranged in the receiving cavity 11a, the transmission assembly 14 comprises a belt pulley mechanism 143, the belt pulley mechanism 143 comprises a synchronous belt 1431, a primary gear 1432 and a secondary gear 1433, and a lead screw 141 in transmission connection with the sliding block 122' and sleeved with the hollow shaft 13. The synchronous belt 1431, the primary gear 1432 and the secondary gear 1433 are arranged at one 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 receiving cavity 11a. One end of the lead screw 141 away from the push-pull box assembly 20 is fixedly connected with the secondary gear 1433, the secondary gear 1433 is in meshing transmission with the primary gear 1432, and the primary gear 1432 is in driving connection with the output shaft of the driving mechanism 15 through the synchronous belt 1431.

[0081] Under the driving of the driving mechanism 15, the transmission assembly 14 converts the rotary motion of the lead screw 141 into the linear motion of the sliding block 122', so as to drive the push-pull box assembly 20 connected with the hollow shaft 13 to reciprocate relative to the seat body 11. 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 with the side wall of the seat body 11 away from the receiving cavity 11a, and the projections of the two guide rods 121' are located within the projection range of the first circuit board 17 along the axial direction of the guide rods 121'. The displacement monitoring element 18 comprises a long potentiometer 181' in strip shape and a plunger assembly 182 connected with the sliding block 122' and having a contact 1821. The long potentiometer 181' comprises a first section 1811', a second section 1812' connected with 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 receiving cavity 11a and is connected with the side wall of the seat body 11 at the receiving cavity 11a; the second section 1812' extends out of the receiving cavity 11a from one end of the seat body 11 provided with the first circuit board 17; the second section 1812' is bent towards the side provided with the first circuit board 17 and is in electrical connection with the first circuit board 17; and the contact 1821 is in contact with the resistor body 1813' to monitor the displacement of the sliding block 122'.

[0082] The above merely provides preferred embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and variations without departing from the spirit and principle of the present application. Any modifications, equivalent replacements, improvements, etc., made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. A syringe pump characterized by, The application relates to a push-pull box assembly and a pump body device. The pump body device comprises a seat body, a sliding assembly, a hollow shaft, a transmission assembly, a driving mechanism, a displacement monitoring element, a first circuit board and an optical coupler; the seat body has a containing cavity; the sliding assembly comprises a first sliding piece arranged on the seat body and a second sliding piece in sliding connection with the first sliding piece; the hollow shaft connects the second sliding piece and the push-pull box assembly; the transmission assembly comprises a screw rod in transmission connection with the second sliding piece, the screw rod is arranged in parallel and at intervals with the first sliding piece and is sleeved with the hollow shaft; the driving mechanism is in driving connection 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 piece, so that the second sliding piece drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the seat body; the first circuit board is arranged on the outer side wall of the seat body; the displacement monitoring element is arranged on one side of the seat body and is in electrical connection with the first circuit board to monitor the displacement of the second sliding piece; the optical coupler is in electrical connection with the first circuit board to detect the starting position of the push-pull box assembly. The displacement monitoring element comprises a potentiometer and a plunger assembly in detachable connection with the second sliding piece; the potentiometer is a long potentiometer in the form of a strip; the plunger assembly comprises a contact head; the long potentiometer comprises a first section, a second section connected with the first section and a resistance body arranged on the first section along the length direction of the long potentiometer; the first section is arranged in the containing cavity and is connected with the side wall of the seat body at the containing cavity; the side wall provided with the first section is adjacent to the outer side wall provided with the first circuit board; the second section extends out of the containing cavity from one end of the seat body provided with the first circuit board; the second section is bent towards the side provided with the first circuit board and is in electrical connection with the first circuit board; the contact head is in contact with the resistance body. The first sliding piece is a guide rod and the second sliding piece is a sliding block penetrating the guide rod.

2. The syringe pump of claim 1, wherein, The seat body has a first positioning hole, a second positioning hole and a limiting hole in communication with the containing cavity respectively; 3. The syringe pump of claim 2, wherein, The first positioning hole is arranged on one side of the seat body close to the push-pull box assembly; The second positioning hole and the first positioning hole are arranged oppositely; one end of the guide rod is inserted into the first positioning hole and the other 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 penetrates the limiting hole. The number of the guide rods is two; the sliding block is formed with a first mounting hole and a second mounting hole arranged at intervals; the projection of the first mounting hole along the axial direction is a closed hole and the projection of the second mounting hole along the axial direction is a semi-closed hole; one of the two guide rods penetrates the first mounting hole and the other penetrates the second mounting hole.

4. The syringe pump of claim 2 or 3, wherein, ​ ​ 5. The syringe pump of claim 2 or 3, wherein, The sliding assembly further comprises an oil-containing bushing arranged on the sliding block, and the sliding block is in sliding connection with the guide rod through the oil-containing bushing.

6. The syringe pump of claim 3, wherein, The first circuit board is arranged on the seat body and covers one side of the first positioning hole away from the accommodating cavity.

7. The syringe pump of any one of claims 1-3, wherein, The screw rod is in threaded connection with the second sliding member; or, The transmission assembly further comprises a nut in threaded connection with the screw rod, and the second sliding member is connected with the nut.

8. The syringe pump of claim 7, wherein, The second sliding member is provided with a third mounting hole, and the nut is arranged in the third mounting hole and in threaded connection with the second sliding member.

9. The syringe pump of claim 7, wherein, The transmission assembly further comprises two bearings arranged adjacently on the seat body; One end of the screw rod in driving connection with the driving mechanism penetrates through the two bearings, and the other end of the screw rod away from the bearings is a free end.

10. The syringe pump of any one of claims 1-3, wherein, The transmission assembly further comprises a belt wheel mechanism, and the belt wheel mechanism comprises a synchronous belt, a primary gear and a secondary gear; The output shaft of the driving mechanism is in driving connection with the primary gear through the synchronous belt; The primary gear is in meshing transmission with the secondary gear, and the secondary gear is fixedly connected with the screw rod.

11. The syringe pump of any one of claims 1-3, wherein, The push-pull box assembly comprises a box body, a probe assembly, a pressure sensor assembly, a claw clamp mechanism and a claw clamp driving assembly. The pressure sensor assembly is arranged in the box body and is arranged in stack with the probe assembly. The claw clamp mechanism has two claw clamps, and each claw clamp comprises a driving rod and a clamping portion outside the box body. The claw clamp driving assembly is arranged in the box body, and the claw clamp driving assembly comprises a second circuit board, a push-pull box motor arranged on the second circuit board and a claw clamp transmission assembly connecting the push-pull box motor and the driving rod.

12. The syringe pump of claim 11, wherein, The push-pull box motor and the claw clamp transmission assembly are located at one end of the second circuit board. The box body comprises a box body and a box cover, and the claw clamp mechanism, the pressure sensor assembly, the probe assembly and the claw clamp driving assembly are sequentially arranged in the box body. The claw clamp mechanism further comprises a transmission gear driving the relative movement of the two claw clamps. The claw clamp transmission assembly comprises a driving gear driven by the push-pull box motor, and the transmission gear is in meshing transmission with the driving gear.

13. The syringe pump of any one of claims 1-3, wherein, The transmission gear and the driving gear are arranged in the axial direction of the claw clamp driving assembly towards the mounting direction of the box body. The hollow shaft comprises a shaft body provided with a mounting channel and a sleeve sleeved in the shaft body. The hollow shaft comprises a shaft body provided with a mounting channel and a sleeve sleeved in the shaft body. The sleeve separates the mounting channel into a first sub-channel and a second sub-channel. The injection pump further comprises a cable and a mainboard. The lead screw is arranged in the first sub-passage, the cable is arranged in the second sub-passage, and the push-pull box assembly is electrically connected with the main board through the cable.

14. The syringe pump of any one of claims 1-3, wherein, The injection 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.

15. A syringe pump characterized by, Comprise: Push-pull box assembly; The pump body device comprises a seat body, a sliding assembly, a hollow shaft, a transmission assembly, a driving mechanism, a displacement monitoring element, a first circuit board and an optical coupler for detecting the starting position of the push-pull box assembly; the seat body has a containing cavity, the sliding assembly comprises two parallel and spaced guide rods and a sliding block arranged on the two guide rods; the two guide rods are arranged in the containing cavity and are insertedly connected with the seat body; the hollow shaft is arranged between the two guide rods, one end of the hollow shaft is connected with the sliding block, and the other end of the hollow shaft away from the sliding block is connected with the push-pull box assembly; the driving mechanism is arranged in the containing cavity, the transmission assembly comprises a belt pulley mechanism, the belt pulley mechanism comprises a synchronous belt, a primary gear, a secondary gear and a lead screw which is in transmission connection with the sliding block and is sleeved with the hollow shaft; the synchronous belt, the primary gear and the secondary gear are arranged at one end of the seat body away from the push-pull box assembly and are located on the side of the seat body away from the containing cavity; one end of the lead screw away from the push-pull box assembly is fixedly connected with the secondary gear, the secondary gear is in meshing transmission with the primary gear, and the primary gear is in driving connection with the output shaft of the driving mechanism through the synchronous belt; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the lead screw into the linear motion of the sliding block, so that the sliding block drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the seat body; the first circuit board is arranged at one end of the seat body close to the push-pull box assembly and is arranged on the outer side wall of the seat body, the projections of the two guide rods are located within the projection range of the first circuit board along the axial direction of the guide rods; the displacement monitoring element comprises a long potentiometer in the form of a strip and a plunger assembly connected with the sliding block and having a contact; the long potentiometer comprises a first section, a second section connected with the first section, and a resistance body arranged on the first section along the length direction of the long potentiometer; the first section is arranged in the containing cavity and is connected with the side wall of the seat body at the containing cavity, and the side wall provided with the first section is adjacent to the outer side wall provided with the first circuit board; the second section extends out of the containing cavity from one end of the seat body provided with the first circuit board; the second section is bent to the side provided with the first circuit board and is electrically connected with the first circuit board; the contact is in contact with the resistance body to monitor the displacement of the sliding block; the optical coupler is electrically connected with the first circuit board.

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