Structure for protecting injection pump piston and protection method thereof

Abstract

The invention relates to the technical field of medical instruments, in particular to a structure for protecting an injection pump piston and a protection method thereof.The structure comprises a pump body, an injector shell pressing plate is fixedly connected to the right side of the bottom of the front side of the pump body, a guide plate is fixedly connected to the bottom of the right side of the pump body, and an electric push-pull rod is arranged at the bottom of the inner wall of the pump body; by arranging the pump body, the injector shell pressing plate, the guide plate, the electric push-pull rod, the push-pull block and a piston rod connecting mechanism, it is crucial to achieve precise control and all-around effective protection of an injection pump piston, and the injection pump piston is prevented from being damaged. In the injection operation process, the system adopts the bidirectional electric push rod to be tightly matched with a series of well-designed linkage structures, so that not only is the stable and firm clamping of the piston push rod successfully realized, but also the piston can smoothly slide in the injection cylinder without hindrance.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a structure and method for protecting an infusion pump piston. Background Technology

[0002] Infusion pumps, as a specially designed medical device, primarily function to precisely control the infusion rate and volume. Their core working mechanism involves a built-in mechanical or electronic control unit that precisely pushes the syringe plunger, ensuring medication is delivered according to preset parameters for accurate drug administration. In a wide range of medical applications, infusion pumps are particularly useful in areas requiring extremely precise drug dosage control, such as the accurate adjustment of anesthetic drug delivery during anesthesia, strict control of chemotherapy drug dosage during chemotherapy, and meticulous management of nutritional support fluid infusions. Infusion pumps play an indispensable role in these applications. Due to their superior performance in ensuring accurate drug dosage, infusion pumps are of paramount importance in improving treatment efficacy, reducing drug side effects, and ensuring patient safety, making them an indispensable part of modern medical equipment.

[0003] According to patent document CN119405942A, a medical electrically controlled piston-type drug injection pump is disclosed, comprising a fixed box and an adjusting box. The adjusting box is installed on one side of the fixed box. A movable groove is formed on the top surface of the adjusting box, and a connecting rod is slidably connected inside the movable groove. The upper end of the connecting rod extends above the movable groove and is connected to a clamping and pushing mechanism. In use, the syringe is placed flat in the mounting groove, and the syringe blades are embedded in the fixed groove. Two clamps are used to clamp the syringe push plate. To clamp, the clamps are pulled open to the sides, placed on both sides of the push plate, and then released to complete the fixation. The operation is simple. The fixed box houses a light-shielding plate, which can be opened by a motor. After opening, it covers the outside of the syringe, providing excellent light protection for liquids requiring protection from light. Simultaneously, the heating wire installed on the inner wall of the light-shielding plate can also provide a certain heating effect on the syringe, reducing discomfort during winter use and improving the overall functionality of the injection pump.

[0004] During the reset operation of the injection pump, when the optocoupler baffle meets the reset optocoupler and triggers a signal, the piston does not stop moving immediately. Instead, it continues to advance along the preset trajectory until the front end of the piston directly contacts the upper sealing cap and stops due to obstruction. At this point, because the materials used for the piston and the upper sealing cap have a certain degree of elasticity and plasticity, slight deformation will inevitably occur during the mutual compression process. Although this deformation may not be obvious at first, if it remains in this state for a long time, it will easily accumulate and form mechanical errors. This error will not only affect the flow accuracy of the injection pump, causing the output flow to deviate from the expected value, but may also cause compression damage to the upper surface of the piston, thereby affecting its service life and the stability of its overall performance. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, the present invention provides a structure and method for protecting the piston of an injection pump. The technical problem to be solved by the present invention is that, since the materials used for the piston and the upper sealing cap have a certain degree of elasticity and plasticity, slight deformation will inevitably occur during the mutual compression process. Although this deformation may not be obvious at first, if it is in this state for a long time, it will easily accumulate and form mechanical errors. This error will not only affect the flow accuracy of the injection pump, causing the output flow to deviate from the expected value, but may also cause compression damage to the upper surface of the piston, thereby affecting its service life and the stability of its overall performance.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A structure for protecting the piston of an injection pump includes a pump body, a syringe housing pressure plate fixedly connected to the right side of the bottom front side of the pump body, a guide plate fixedly connected to the bottom right side of the pump body, an electric push-pull rod provided at the bottom inner wall of the pump body, the right end of the electric push-pull rod extending to the right side of the outer wall of the pump body and fixedly connected to a push-pull block, and a piston rod connecting mechanism provided on the inner wall of the push-pull block. The piston rod connecting mechanism includes a push-pull housing, and a limit assembly is provided on the front side of the inner wall of the push-pull housing.

[0007] As a further aspect of the present invention: the limiting component includes a limiting control component, and a clamping member is provided on the left side of the limiting control component.

[0008] As a further embodiment of the present invention: the limiting control component includes a connecting plate, an L-shaped connecting plate is fixedly connected to the top and bottom of the right side of the outer wall, a concave guide plate is fixedly connected to the top and bottom of the right side of the connecting plate, a connecting plate is fixedly connected to the right side of the inner side of the two L-shaped connecting plates, a through hole is opened in the middle of the two connecting plates, a connecting block is fixedly connected to the front and rear sides of the middle left side of the two connecting plates, and a rectangular frame is fixedly connected to the left side of the two sets of connecting blocks.

[0009] As a further embodiment of the present invention: an outer circular tube is fixedly connected to the inner side of the two connecting plates, a spring is fixedly connected to the right end of the inner wall of the outer circular tube, a U-shaped sleeve plate is fixedly connected to the inner side of the two connecting blocks at the top and the two connecting blocks at the bottom, the inner wall of the U-shaped sleeve plate is fitted onto the outer wall of the outer circular tube, and a bidirectional electric push rod is fixedly connected to the right end of the outer circular tube.

[0010] As a further embodiment of the present invention: L-shaped expansion blocks are slidably connected to the front and rear sides of the inner walls of the two concave guide plates; rotating rods are rotatably connected to the middle of the right side of the two sets of L-shaped expansion blocks; U-shaped rotating blocks are rotatably connected to the outer sides of the two sets of L-shaped expansion blocks; push-pull blocks are rotatably connected to the right sides of the two sets of rotating rods at the top and bottom; the outer right sides of the outer walls of the two sets of U-shaped rotating blocks at the top and bottom are rotatably connected to the front and rear sides of the inner walls of the two rectangular frames; the outer walls of the two push-pull blocks are slidably connected to the inner sides of the two sets of connecting blocks; and columnar push-pull rods are fixedly connected to the right sides of the two push-pull blocks.

[0011] As a further embodiment of the present invention: the right ends of the two columnar push-pull rods extend to the right side of the connecting plate through the through holes opened in the two connecting plates; a second spring is sleeved on one side of the outer wall of the two columnar push-pull rods on the right side of the connecting plate; a push-pull upright plate is fixedly connected to the right end of the two columnar push-pull rods; a convex expansion plate is fixedly connected to the inner side of the two sets of L-shaped expansion blocks; and the right side of the inner side of the two convex expansion plates is fixedly connected to the front and rear ends of the bidirectional electric push rod.

[0012] As a further aspect of the present invention: the clamping member includes a clamping disk, the outer wall of the clamping disk is fixedly connected with a U-shaped hinge block in an annular array, the inner walls of the plurality of U-shaped hinge blocks are rotatably connected with an arc-shaped rotating rod, the outer walls of the top and bottom two U-shaped hinge blocks are fixedly connected with an inverted U-shaped connecting plate, and the right sides of the two inverted U-shaped connecting plates that are far apart from each other are fixedly connected with a columnar connecting rod.

[0013] As a further embodiment of the present invention: C-shaped connecting side plates are fixedly connected to the middle of the front and rear sides of the two inverted U-shaped connecting uprights; the right sides of the inner sides of the two sets of C-shaped connecting side plates at the top and bottom are fixedly connected to the top and bottom of the front and rear sides of the push-pull uprights; a second rotating rod is rotatably connected to the right side of the multiple arc-shaped rotating rods; a hinge plate is rotatably connected to the right side of the outer wall of the multiple second rotating rods; a columnar slide rod is fixedly connected to the right side of the hinge plate; the outer wall of the columnar slide rod is slidably connected to the inner wall of the outer circular tube; and the right end of the columnar slide rod is fixedly connected to the left end of the spring.

[0014] As a further embodiment of the present invention: the push-pull housing includes an outer sleeve, the left side of the inner wall of the outer sleeve is slidably connected to the outside of two L-shaped connecting plates, the right side of the inner wall of the outer sleeve is slidably connected to a semi-circular push plate connecting rod, the right end of the semi-circular push plate connecting rod extends to the right side of the outer wall of the outer sleeve and is fixedly connected to a semi-circular push plate, the top and bottom of the left side of the semi-circular push plate are both fixedly connected to the right ends of two columnar connecting rods, the front side of the semi-circular push plate is fixedly connected to an L-shaped push-pull side plate, the left side of the L-shaped push-pull side plate is fixedly connected to a partition, the rear side of the partition is a semi-circular cross-section, and the outer wall of the outer sleeve is fixedly connected to the inner wall of the push-pull block.

[0015] In addition, the present invention also relates to a structure and method for protecting the piston of an injection pump, comprising the following steps: Step 1: Before the syringe pump is put into operation, perform an overall visual inspection of the syringe pump, check the pump body, syringe housing pressure plate, electric push-pull rod, push-pull block, piston rod connection mechanism and replace or tighten them in time to ensure that the syringe pump is in good initial working condition. Step 2: Carefully inspect the syringe to be used to ensure that it is free from damage or cracks, that there are no foreign objects inside the syringe barrel, and that the piston rod slides smoothly. Then, accurately place the qualified syringe in the groove on the front side of the pump body and use the syringe shell pressure plate to firmly fix it to ensure that the syringe will not be displaced during subsequent work. Step 3: The syringe piston rod fits tightly against the left side of the clamping plate, and the bidirectional electric actuator is activated; Step 4: Activate the bidirectional electric push rod, which transmits power to the convex expansion plate and drives the two sets of L-shaped expansion blocks to slide smoothly on the inner wall of the concave guide plate. Step 5: Start the bidirectional electric actuator. The power of the bidirectional electric actuator is transmitted to the columnar slide rod through the spring. The columnar slide rod drives the hinge plate to move. The hinge plate drives the arc-shaped rotating rod to rotate inside the U-shaped hinge block through the second rotating rod. Multiple arc-shaped rotating rods converge towards the center, tightly clamping the piston rod of the syringe to the left side of the clamping plate. Step Six: Start the electric push-pull rod. The push-pull block drives the piston rod connecting mechanism to move to the right. When the front end of the piston approaches the upper sealing cover, slow down the movement speed of the electric push-pull rod. Step 7: When the piston front end directly contacts the upper sealing cover, promptly continue to start the bidirectional electric push rod to keep it running, pulling the clamping part that fixes the piston push rod to move further to the right, ensuring that when the push rod moves to the right inside the piston, the piston can fit tightly against the sealing cover, and the push rod does not exert strong pressure on the piston.

[0016] The beneficial effects of this invention are as follows: This invention, through the inclusion of a pump body, syringe housing pressure plate, guide plate, electric push-pull rod, push-pull block, and piston rod connection mechanism, achieves crucial precise control and comprehensive protection of the injection pump piston. During injection, the system, through the close cooperation of a bidirectional electric push rod and a series of meticulously designed linkage structures, not only successfully achieves stable and secure clamping of the piston push rod but also ensures smooth and unobstructed sliding of the piston inside the syringe barrel, thereby guaranteeing the stability and continuity of the injection process. Furthermore, when the piston tip contacts the upper sealing cap, the system can intelligently sense and quickly adjust the position of the clamping components, precisely avoiding excessive pressure from the push rod on the piston. This intelligent adjustment mechanism effectively prevents damage to the piston caused by excessive force. This ingenious design not only significantly improves injection accuracy and operational stability but also greatly extends the overall service life of the injection pump, ensuring long-term reliable operation of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional separation structure of the main body of the present invention; Figure 3 This is a three-dimensional structural diagram of the push-pull block and piston rod connection mechanism of the present invention; Figure 4 This is a three-dimensional schematic diagram of the push-pull block and piston rod connection mechanism of the present invention. Figure 5 This is a three-dimensional detached structure diagram of the piston rod connecting mechanism of the present invention; Figure 6 This is a three-dimensional structural diagram of the limiting component of the present invention; Figure 7 This is a schematic diagram of the three-dimensional separation structure of the limiting component of the present invention; Figure 8 This is a schematic diagram of the three-dimensional separation structure of the limit control component of the present invention; Figure 9 This is a three-dimensional structural diagram of the clamping component of the present invention; Figure 10 This is a schematic diagram of the three-dimensional structure of the push-pull housing of the present invention.

[0018] In the diagram: 1. Pump body; 2. Syringe housing pressure plate; 3. Guide plate; 4. Electric push-pull rod; 5. Push-pull block; 6. Piston rod connecting mechanism; 61. Push-pull housing; 611. Outer sleeve; 612. Semi-circular push plate connecting rod; 613. Semi-circular push plate; 614. L-shaped push-pull side plate; 615. Partition; 62. Limiting assembly; 621. Limiting control assembly; 6211. Connecting plate; 6212. L-shaped connecting plate; 6213. Concave guide plate; 6214. Connecting plate; 6215. Through hole; 6216. Connecting block; 6217. Rectangular frame; 6218. U-shaped sleeve; 6219. Outer tube; 621 10. Spring; 62111. Bidirectional electric push rod; 62112. L-shaped expansion block; 62113. U-shaped rotating block; 62114. Rotating rod; 62115. Push-pull block; 62116. Columnar push-pull rod; 62117. Second spring; 62118. Push-pull upright plate; 62119. Convex expansion plate; 622. Clamping component; 6221. Clamping disc; 6222. U-shaped hinge block; 6223. Arc-shaped rotating rod; 6224. Inverted U-shaped connecting upright plate; 6225. C-shaped connecting side plate; 6226. Columnar connecting rod; 6227. Second rotating rod; 6228. Hinge disc; 6229. Columnar slide rod. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-2 As shown, the present invention provides a structure for protecting the piston of an injection pump, including a pump body 1, a syringe housing pressure plate 2 fixedly connected to the right side of the bottom front side of the pump body 1, a guide plate 3 fixedly connected to the bottom right side of the pump body 1, an electric push-pull rod 4 provided at the bottom inner wall of the pump body 1, the right end of the electric push-pull rod 4 extending to the right side of the outer wall of the pump body 1 and fixedly connected to a push-pull block 5, and a piston rod connecting mechanism 6 provided on the inner wall of the push-pull block 5.

[0021] like Figure 3-10As shown, the piston rod connecting mechanism 6 includes a push-pull housing 61. A limit component 62 is provided on the front side of the inner wall of the push-pull housing 61. The limit component 62 includes a limit control component 621. A clamping member 622 is provided on the left side of the limit control component 621. The limit control component 621 includes a connecting plate 6211. L-shaped connecting plates 6212 are fixedly connected to the top and bottom of the right side of the outer wall. Concave guide plates 6213 are fixedly connected to the top and bottom of the right side of the connecting plate 6211. Connecting plates 6214 are fixedly connected to the right side of the inner side of the two L-shaped connecting plates 6212. A through hole 6215 is opened in the middle of the two connecting plates 6214. Connecting blocks 6216 are fixedly connected to the front and rear sides of the middle left side of the two connecting plates 6214. Two sets of connecting blocks A rectangular frame 6217 is fixedly connected to the left side of each of the two connecting plates 6214. An outer circular tube 6219 is fixedly connected to the inner side of the two connecting plates 6214. A spring 62110 is fixedly connected to the right end of the inner wall of the outer circular tube 6219. A U-shaped sleeve plate 6218 is fixedly connected to the inner side of the two top connecting blocks 6216 and the two bottom connecting blocks 6216. The inner wall of the U-shaped sleeve plate 6218 fits onto the outer wall of the outer circular tube 6219. A bidirectional electric push rod 62111 is fixedly connected to the right end of the outer circular tube 6219. L-shaped expansion blocks 62112 are slidably connected to the front and rear sides of the inner walls of the two concave guide horizontal plates 6213. A rotating rod 62114 is rotatably connected to the middle of the right side of each of the two sets of L-shaped expansion blocks 62112. A rotating rod 62114 is rotatably connected to the outer side of each of the two sets of L-shaped expansion blocks 62112. A U-shaped rotating block 62113 is connected to the top and bottom sets of rotating rods 62114, and push-pull blocks 62115 are rotatably connected to the right side of each. The outer right side of the outer walls of the top and bottom sets of U-shaped rotating blocks 62113 are rotatably connected to the front and rear sides of the inner walls of the two rectangular frames 6217. The outer walls of the two push-pull blocks 62115 are slidably connected to the inner sides of the two sets of connecting blocks 6216. A columnar push-pull rod 62116 is fixedly connected to the right side of each push-pull block 62115. The right ends of the two columnar push-pull rods 62116 extend to the right side of the connecting plates 6214 through through holes 6215. A second spring 62117 is fitted on one side of the outer wall of each columnar push-pull rod 62116 on the right side of the connecting plate 6214. A push-pull upright plate 62118 is fixedly connected to the right end of the pull rod 62116. Convex expanding plates 62119 are fixedly connected to the inner sides of both sets of L-shaped expanding blocks 62112. The right sides of the inner sides of the two convex expanding plates 62119 are fixedly connected to the front and rear ends of the bidirectional electric push rod 62111. The clamping member 622 includes a clamping disk 6221. U-shaped hinge blocks 6222 are fixedly connected to the outer wall of the clamping disk 6221 in a circular array. Arc-shaped rotating rods 6223 are rotatably connected to the inner walls of the multiple U-shaped hinge blocks 6222. Inverted U-shaped connecting upright plates 6224 are fixedly connected to the outer walls of the top and bottom U-shaped hinge blocks 6222. Columnar connecting rods 6226 are fixedly connected to the right sides of the two inverted U-shaped connecting upright plates 6224 that are far apart from each other.Two inverted U-shaped connecting uprights 6224 are fixedly connected to C-shaped connecting side plates 6225 at the middle of their front and rear sides. The right sides of the inner sides of the two sets of C-shaped connecting side plates 6225 at the top and bottom are fixedly connected to the top and bottom of the front and rear sides of the push-pull upright 62118. The right sides of multiple arc-shaped rotating rods 6223 are rotatably connected to second rotating rods 6227. The right sides of the outer walls of the multiple second rotating rods 6227 are rotatably connected to hinge plates 6228. The right side of the hinge plates 6228 is fixedly connected to columnar slide rods 6229. The outer wall of columnar slide rods 6229 is slidably connected to the inner wall of the outer circular tube 6219. The right end of columnar slide rods 6229 is fixedly connected to the left end of spring 62110. The push-pull housing 61 includes an outer... The inner left side of the sleeve 611 is slidably connected to the outside of two L-shaped connecting plates 6212. A semi-circular push plate connecting rod 612 is slidably connected to the right side of the inner wall of the sleeve 611. The right end of the semi-circular push plate connecting rod 612 extends to the right side of the outer wall of the sleeve 611 and is fixedly connected to a semi-circular push plate 613. The top and bottom of the left side of the semi-circular push plate 613 are fixedly connected to the right ends of two columnar connecting rods 6226. An L-shaped push-pull side plate 614 is fixedly connected to the front side of the semi-circular push plate 613. A partition 615 is fixedly connected to the left side of the L-shaped push-pull side plate 614. The rear side of the partition 615 has a semi-circular cross-section. The outer wall of the sleeve 611 is fixedly connected to the inner wall of the push-pull block 5. When injecting, the syringe is first placed in the groove on the front side of the pump body 1 and fixed by the syringe housing pressure plate 2. The syringe piston rod is attached to the left side of the clamping plate 6221. Then, the bidirectional electric push rod 62111 is activated. After the bidirectional electric push rod 62111 is activated, the power at its front and rear ends is transmitted to the convex expansion plate 62119. The convex expansion plate 62119 drives the two sets of L-shaped expansion blocks 62112 in the concave guide plate 6213. The wall slides because of the rotational connection between the L-shaped expansion block 62112 and the rotating rod 62114 and the U-shaped rotating block 62113, as well as the rotational connection between the rotating rod 62114 and the push-pull block 62115, and the U-shaped rotating block 62113 and the rectangular frame 6217. This causes the push-pull block 62115 to slide inside the connecting block 6216, thereby driving the columnar push-pull rod 62116 to move within the through hole 6215 of the connecting plate 6214, while simultaneously compressing the second spring 62117. The movement of the columnar push-pull rod 62116 causes the push-pull upright plate 62118 to move. The push-pull upright plate 62118 then causes the inverted U-shaped connecting upright plate 6224 to move through the C-shaped connecting side plate 6225. The inverted U-shaped connecting upright plate 6224 causes the columnar connecting rod 6226 to move. The columnar connecting rod 6226 causes the semi-circular push plate 613 to move. The semi-circular push plate 613 slides inside the outer sleeve 611 through the semi-circular push plate connecting rod 612, and causes the L-shaped push-pull side plate 614 and its left side partition 615 to slide to the point close to the connection between the piston push rod and the clamping plate 6221. At the same time, the power of the bidirectional electric push rod 62111 is also transmitted to the columnar slide rod 6229 through the spring 62110. The columnar slide rod 6229 drives the hinge plate 6228 to move. The hinge plate 6228 drives the arc-shaped rotating rod 6223 to rotate in the U-shaped hinge block 6222 through the second rotating rod 6227, so that multiple arc-shaped rotating rods 6223 gradually converge towards the center, thereby tightly clamping the piston rod of the syringe on the left side of the clamping plate 6221. Then, the electric push-pull rod 4 is activated, pulling the push-pull block 5 to move the piston rod connecting mechanism 6 to the right, thereby pushing the piston push rod to slide inside the syringe. When the front end of the piston directly contacts the upper sealing cap, the bidirectional electric push rod 62111 is activated again. The bidirectional electric push rod 62111 continues to operate, pulling the clamping part 622 that fixes the piston push rod to move further to the right. At this time, the push rod moves to the right inside the piston, thus ensuring that the piston fits the sealing cap. The push rod does not exert strong pressure on the piston. This design effectively avoids the situation in traditional injection pumps where the push rod cannot continue to move when the piston contacts the sealing cap, resulting in excessive pressure on the piston. Excessive pressure may cause piston deformation, reduced sealing performance, and even affect the accuracy and stability of injection. During the movement of the piston rod, the partition 615 plays a crucial auxiliary and protective role. Due to its semi-circular cross-section design on the rear side, when the semi-circular push plate 613 drives the L-shaped push-pull side plate 614 and the partition 615 to slide close to the connection between the piston rod and the clamping plate 6221, the partition 615 can fit tightly around the piston rod, forming a relatively closed and stable space. This design not only helps to reduce the interference of external factors on the movement of the piston rod, but also prevents the piston rod from shifting or shaking during the movement to a certain extent, thereby ensuring the accuracy and stability of the injection process.

[0022] In addition, the present invention also relates to a structure and method for protecting the piston of an injection pump, comprising the following steps: Step 1: Before the syringe pump is put into operation, perform an overall visual inspection of the syringe pump, check the pump body 1, syringe housing pressure plate 2, electric push-pull rod 4, push-pull block 5, piston rod connecting mechanism 6, and replace or tighten them in time to ensure that the syringe pump is in good initial working condition. Step 2: Carefully inspect the syringe to be used to ensure that the syringe is free from damage or cracks, there are no foreign objects inside the syringe barrel, and the piston rod slides smoothly. Then, accurately place the qualified syringe in the groove on the front side of the pump body 1 and use the syringe shell pressure plate 2 to firmly fix it to ensure that the syringe will not be displaced during subsequent work. Step 3: The syringe piston rod fits tightly against the left side of the clamping plate 6221, and the bidirectional electric actuator 62111 is activated; Step 4: Start the bidirectional electric push rod 62111, which transmits power to the convex expansion plate 62119 and drives the two sets of L-shaped expansion blocks 62112 to slide smoothly on the inner wall of the concave guide plate 6213. Step 5: The bidirectional electric push rod 62111 is started. The power of the bidirectional electric push rod 62111 is transmitted to the columnar slide rod 6229 through the spring 62110. The columnar slide rod 6229 drives the hinge plate 6228 to move. The hinge plate 6228 drives the arc-shaped rotating rod 6223 to rotate in the U-shaped hinge block 6222 through the second rotating rod 6227. Multiple arc-shaped rotating rods 6223 converge towards the center, tightly clamping the piston rod of the syringe to the left side of the clamping plate 6221. Step 6: Start the electric push-pull rod 4. The push-pull block 5 drives the piston rod connecting mechanism 6 to move to the right. When the front end of the piston approaches the upper sealing cover, slow down the movement speed of the electric push-pull rod 4. Step 7: When the piston front end directly contacts the upper sealing cover, promptly continue to start the bidirectional electric push rod 62111 to keep it running, pulling the clamping part 622 that fixes the piston push rod to move further to the right, ensuring that when the push rod moves to the right inside the piston, the piston can fit tightly against the sealing cover, and the push rod does not exert strong pressure on the piston.

[0023] Working principle of the invention: When injecting, the syringe is first placed in the groove on the front side of the pump body 1 and fixed by the syringe housing pressure plate 2. The syringe piston rod is attached to the left side of the clamping plate 6221. Then, the bidirectional electric push rod 62111 is activated. After the bidirectional electric push rod 62111 is activated, the power at its front and rear ends is transmitted to the convex expansion plate 62119. The convex expansion plate 62119 drives the two sets of L-shaped expansion blocks 62112 to slide on the inner wall of the concave guide plate 6213. Due to the rotational connection between the L-shaped expansion blocks 62112 and the rotating rod 62114 and the U-shaped rotating block 62113, and the rotational connection between the rotating rod 62114 and the push-pull block 62115 and the U-shaped rotating block 62113, The rotatable connection with the rectangular frame 6217 allows the push-pull block 62115 to slide inside the connecting block 6216, thereby driving the columnar push-pull rod 62116 to move within the through hole 6215 of the connecting plate 6214, while simultaneously compressing the second spring 62117. When the syringe is injecting, it is first placed in the groove on the front side of the pump body 1 and fixed by the syringe housing pressure plate 2. The piston rod of the syringe is attached to the left side of the clamping plate 6221. Then, the bidirectional electric push rod 62111 is activated. After the bidirectional electric push rod 62111 is activated, the power at its front and rear ends is transmitted to the convex expansion plate 62119. The convex expansion plate 62119 drives the two sets of L-shaped expansion blocks 62112 to move within the concave guide plate 6213. The inner wall slides due to the rotational connection between the L-shaped expanding block 62112 and the rotating rod 62114, the U-shaped rotating block 62113, and the rotating rod 62114 and the push-pull block 62115, and the U-shaped rotating block 62113 and the rectangular frame 6217. This causes the push-pull block 62115 to slide inside the connecting block 6216, thereby driving the columnar push-pull rod 62116 to move within the through hole 6215 of the connecting plate 6214. Simultaneously, the second spring 62117 is compressed. At the same time, the power of the bidirectional electric push rod 62111 is also transmitted to the columnar slide rod 6229 via the spring 62110. The columnar slide rod 6229 drives the hinge plate 6228 to move, and the hinge plate 6228 is driven by the second rotating rod 6227. The rotating rod 6223 rotates within the U-shaped hinge block 6222, causing multiple rotating rods 6223 to gradually converge towards the center, thereby tightly clamping the piston rod of the syringe to the left side of the clamping plate 6221. Then, the electric push-pull rod 4 is activated to pull the push-pull block 5, which drives the piston rod connecting mechanism 6 to move to the right as a whole, thereby pushing the piston rod to slide inside the syringe. When the front end of the piston directly contacts the upper sealing cap, the bidirectional electric push rod 62111 is activated again. The bidirectional electric push rod 62111 continues to operate, pulling the clamping member 622 that fixes the piston rod to move further to the right. At this time, the push rod moves to the right inside the piston, thereby ensuring that the piston fits the sealing cap and the push rod does not exert strong pressure on the piston.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A structure for protecting a syringe pump piston, comprising a pump body (1), characterized in that: The right side of the bottom of the front side of the pump body (1) is fixedly connected with a syringe shell pressing plate (2), the right side of the bottom of the pump body (1) is fixedly connected with a guide plate (3), the inner wall bottom of the pump body (1) is provided with an electric push-pull rod (4), the right end of the electric push-pull rod (4) extends to the outer wall right side of the pump body (1) and is fixedly connected with a push-pull block (5), the inner wall of the push-pull block (5) is provided with a piston rod connecting mechanism (6). The piston rod connecting mechanism (6) comprises a push-pull shell (61), and the inner wall front side of the push-pull shell (61) is provided with a limiting component (62).

2. The structure for protecting the piston of the injection pump according to claim 1, characterized in that: The limiting component (62) comprises a limiting control component (621), and the left side of the limiting control component (621) is provided with a clamping piece (622).

3. The structure for protecting the piston of the injection pump according to claim 2, wherein: The limiting control component (621) comprises a connecting disc (6211), and the top and bottom of the outer wall right side are fixedly connected with L-shaped link plates (6212), the top and bottom of the right side of the connecting disc (6211) are fixedly connected with concave guide horizontal plates (6213), the right side of the inner side of the two L-shaped link plates (6212) is fixedly connected with connecting plates (6214), the middle part of the two connecting plates (6214) is provided with a through hole (6215), and the front and rear sides of the left side middle part of the two connecting plates (6214) are fixedly connected with link blocks (6216). The left side of the two groups of link blocks (6216) is fixedly connected with a square frame (6217).

4. The structure for protecting the piston of the injection pump according to claim 3, wherein: The inner side of the two connecting plates (6214) is fixedly connected with an outer circular pipe (6219), the inner wall right end of the outer circular pipe (6219) is fixedly connected with a spring (62110), the inner side of the top two link blocks (6216) and the bottom two link blocks (6216) is fixedly connected with a U-shaped sleeve plate (6218), the inner wall of the U-shaped sleeve plate (6218) is sleeved on the outer wall of the outer circular pipe (6219), and the right end of the outer circular pipe (6219) is fixedly connected with a bidirectional electric push rod (62111).

5. The structure for protecting the piston of the injection pump according to claim 3, wherein: The front and rear sides of the inner wall of the two concave guide horizontal plates (6213) are slidably connected with L-shaped expansion blocks (62112), the middle part of the right side of the two groups of L-shaped expansion blocks (62112) is rotatably connected with rotating rods (62114), the outer side of the two groups of L-shaped expansion blocks (62112) is rotatably connected with U-shaped rotating blocks (62113), the right side of the two groups of rotating rods (62114) of the top and bottom is rotatably connected with push-pull blocks (62115), the right side of the outer wall of the two groups of U-shaped rotating blocks (62113) of the top and bottom is rotatably connected with the front and rear sides of the inner wall of the two square frames (6217), the outer wall of the two push-pull blocks (62115) is slidably connected with the inner side of the two groups of link blocks (6216), and the right side of the two push-pull blocks (62115) is fixedly connected with a cylindrical push-pull rod (62116).

6. The structure for protecting the piston of the injection pump according to claim 5, wherein: The right ends of the two columnar push-pull rods (62116) extend to the right side of the connecting plates (6214) through the through holes (6215) of the two connecting plates (6214), the outer walls of the two columnar push-pull rods (62116) are sleeved with second springs (62117 on the right side of the connecting plates (6214), the right ends of the two columnar push-pull rods (62116) are fixedly connected with push-pull vertical plates (62118), the inner sides of the front and rear groups of L-shaped expansion blocks (62112) are fixedly connected with convex expansion plates (62119), and the right sides of the inner sides of the two convex expansion plates (62119) are fixedly connected with the front and rear ends of the bidirectional electric push rod (62111).

7. The structure for protecting the piston of the injection pump according to claim 2, wherein: The clamping piece (622) comprises a clamping disc (6221), and the outer wall of the clamping disc (6221) is fixedly connected with a U-shaped hinged block (6222) in an annular array, the inner wall of the U-shaped hinged block (6222) is rotatably connected with an arc-shaped rotating rod (6223), the outer walls of the two U-shaped hinged blocks (6222) at the top and bottom are fixedly connected with inverted U-shaped connecting vertical plates (6224), and the right sides of the two inverted U-shaped connecting vertical plates (6224) away from each other are fixedly connected with columnar connecting rods (6226).

8. The structure for protecting the piston of the injection pump according to claim 7, wherein: The middle parts of the front and rear sides of the two inverted U-shaped connecting vertical plates (6224) are fixedly connected with C-shaped connecting side plates (6225), the right sides of the inner sides of the two groups of C-shaped connecting side plates (6225) at the top and bottom are fixedly connected to the top and bottom of the front and rear sides of the push-pull vertical plate (62118), the right sides of the arc-shaped rotating rods (6223) are rotatably connected with second rotating rods (6227), the right sides of the outer walls of the second rotating rods (6227) are rotatably connected with hinged discs (6228), the right side of the hinged disc (6228) is fixedly connected with a columnar sliding rod (6229), the outer wall of the columnar sliding rod (6229) is slidably connected to the inner wall of the outer circular tube (6219), and the right end of the columnar sliding rod (6229) is fixedly connected to the left end of the spring (62110).

9. The structure for protecting the piston of a syringe pump according to claim 1, characterized in that: The push-pull shell (61) comprises an outer sleeve tube (611), the left side of the inner wall of the outer sleeve tube (611) is slidably connected to the outer side of the two L-shaped connecting plates (6212), the right side of the inner wall of the outer sleeve tube (611) is slidably connected with a semicircular push plate connecting rod (612), the right end of the semicircular push plate connecting rod (612) extends to the right side of the outer wall of the outer sleeve tube (611) and is fixedly connected with a semicircular push plate (613), the top and bottom of the left side of the semicircular push plate (613) are fixedly connected to the right ends of the two columnar connecting rods (6226), the front side of the semicircular push plate (613) is fixedly connected with an L-shaped push-pull side plate (614), the left side of the L-shaped push-pull side plate (614) is fixedly connected with a partition plate (615), the rear side of the partition plate (615) is a semicircular cross section, and the outer wall of the outer sleeve tube (611) is fixedly connected to the inner wall of the push-pull block (5).

10. A protective method for the structure of a syringe pump piston, comprising a protective structure for the syringe pump piston according to any one of claims 1-9, characterized in that it comprises the following steps: Step one: Before the syringe pump works, the appearance of the syringe pump is checked, and the pump body (1), the syringe shell pressing plate (2), the electric push-pull rod (4), the push-pull block (5), and the piston rod connecting mechanism (6) are checked, and timely replacement or tightening treatment is performed to ensure that the syringe pump is in good initial working condition; Step two: The syringe to be used is carefully checked to confirm that the syringe is not damaged, cracked, and has no foreign matter in the syringe barrel, and the piston push rod slides smoothly, and then the syringe that meets the requirements is accurately placed in the groove on the front side of the pump body (1), and the syringe shell pressing plate (2) is used to firmly fix it, to ensure that the syringe does not displace during subsequent work; Step three: The piston push rod of the syringe is tightly attached to the left side of the clamping disc (6221), and the bidirectional electric push rod (62111) is started; Step four: The bidirectional electric push rod (62111) is started, and the power is transmitted to the convex expansion plate (62119), and the front and rear two groups of L-shaped expansion blocks (62112) are smoothly slid in the inner wall of the concave guide horizontal plate (6213); Step five: The bidirectional electric push rod (62111) is started, and the power of the bidirectional electric push rod (62111) is transmitted to the columnar slide rod (6229) through the spring (62110), and the columnar slide rod (6229) drives the hinged disc (6228) to move, and the hinged disc (6228) drives the arc-shaped rotating rod (6223) to rotate in the U-shaped hinged block (6222) through the second rotating rod (6227), and multiple arc-shaped rotating rods (6223) gather towards the center, tightly clamping the piston push rod of the syringe on the left side of the clamping disc (6221); Step six: The electric push-pull rod (4) is started, the push-pull block (5) drives the piston rod connecting mechanism (6) to move to the right side, and when the front end of the piston approaches the upper sealing cover, the movement speed of the electric push-pull rod (4) is slowed down; Step seven: When the front end of the piston directly contacts the upper sealing cover, the bidirectional electric push rod (62111) is timely started to continuously operate, pulling the clamping piece (622) that fixes the piston push rod to further move to the right side, to ensure that the push rod moves to the right side in the piston, and the piston can tightly fit the sealing cover, and the push rod does not produce strong extrusion on the piston. ​

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