Syringe plunger assembly apparatus and method

Abstract

The application discloses an injector push rod assembling device, which comprises a push rod distance separating mechanism, a push rod pushing mechanism and an injector clamping mechanism arranged in sequence, a push rod translation transferring mechanism is arranged between the push rod distance separating mechanism and the push rod pushing mechanism and used for transferring the push rod translation of the push rod distance separating mechanism to the push rod pushing mechanism, the push rod pushing mechanism is used for pushing the push rod into the injector on the injector clamping mechanism, a needle positioning mechanism is arranged between the push rod pushing mechanism and the injector clamping mechanism, an extrusion mechanism is arranged on the push rod pushing mechanism and used for extruding the rod body to reduce the head of the rod body. The application further discloses an injector push rod assembling method, which comprises the following steps: distance separation, translation transferring, necking and positioning, first time pushing, lowering and returning, and second time pushing. The injector push rod assembling device and method have the advantages of improving production efficiency and production quality, avoiding misalignment of the push rod and the injector, reducing the damage probability of the push rod and production cost and the like.

Description

Technical Field

[0001] This invention relates to the field of food and pharmaceutical packaging machinery and equipment, and in particular to a syringe plunger assembly device and method. Background Technology

[0002] During the manufacturing process of the skin-release implant syringe, the plunger 4 needs to be precisely inserted into the syringe 6, such as... Figure 1 As shown, the push rod 4 includes a pin 41 and a rod body 42. The pin 41 is located at the head of the rod body 42, and the head of the rod body 42 can be clamped and narrowed towards the center. Currently, the push rod 4 is generally inserted into the syringe 6 manually, which results in low production efficiency and high cost.

[0003] The plunger 4 can also be inserted into the syringe 6 mechanically, as in Chinese patent application CN202210910658.0, entitled "A Syringe Plunger Assembly Device and Method". However, this application has the following shortcomings:

[0004] 1) The tail (rod 42) cannot be clamped and constricted during the process of entering the syringe, which can easily cause damage to the tail and the syringe.

[0005] 2) The push rod clamping assembly is set on the translation seat, but the push rod guide mechanism is not set on the translation seat. The push rod guide mechanism and the push rod clamping assembly cannot move synchronously. As a result, the push rod guide mechanism moves relative to the ejector pin 41 during the process of guiding the ejector pin 41, which can easily cause wear on the ejector pin 41. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a syringe plunger assembly device and method that can improve production efficiency and quality, avoid misalignment of the plunger and syringe, and reduce the probability of plunger damage and production costs.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A syringe plunger assembly device includes a plunger splitting mechanism, a plunger pushing mechanism, and a syringe clamping mechanism arranged sequentially. A plunger translation and transfer mechanism is provided between the plunger splitting mechanism and the plunger pushing mechanism for transferring the plunger from the plunger splitting mechanism to the plunger pushing mechanism. The plunger pushing mechanism pushes the plunger into a syringe on the syringe clamping mechanism. A liftable and openable ejector pin positioning mechanism is provided between the plunger pushing mechanism and the syringe clamping mechanism. A squeezing mechanism is provided on the plunger pushing mechanism for squeezing the plunger body to reduce the size of the plunger head.

[0009] As a further improvement to the above technical solution:

[0010] The push rod pushing mechanism includes a lifting seat, a translation seat, multiple rod positioning seats arranged side by side on the translation seat, a lifting drive mechanism for driving the lifting seat to rise and fall, and a translation drive mechanism for driving the translation seat to reciprocate and translate towards the syringe clamping mechanism. The squeezing mechanism is located on the translation seat.

[0011] The extrusion mechanism includes multiple extrusion components, each of which is located on the front side of each rod positioning seat.

[0012] The extrusion assembly includes a pair of clamps disposed on a translation seat and an opening and closing drive for driving the pair of clamps to open and close.

[0013] The rod positioning seat is provided with a positioning groove that is adapted to the rod.

[0014] The ejector pin positioning mechanism includes multiple lifting mechanisms located in front of each pair of rod positioning seats. Each lifting mechanism is provided with a pair of grippers for holding the positioning ejector pin. The lifting mechanism is provided with an opening and closing drive for driving the pair of grippers to open and close. The lifting mechanism is mounted on a translation seat.

[0015] The bottom end of each pair of grippers is rotatably connected to the lifting mechanism, and the top end is provided with a left positioning sleeve groove and a right positioning sleeve groove, which are arranged alternately.

[0016] Each translation seat is equipped with a clamping detection mechanism on the rear side of each rod positioning seat to detect whether the push rod is pushed into the syringe.

[0017] The syringe clamping mechanism includes a liftable syringe upper support assembly and a liftable syringe lower pressure assembly, which are arranged vertically to each other for clamping and holding syringes.

[0018] A method for assembling a syringe plunger includes the following steps:

[0019] S1, Spacing: The push rod is spaced by the push rod spacing mechanism to increase the spacing;

[0020] S2, Transfer: The push rod translation and transfer mechanism transfers the push rods, which have been separated by the push rod spacing mechanism, to the push rod pushing mechanism;

[0021] S3, Narrowing and Positioning: The extrusion mechanism extrudes the rod to narrow the head of the rod; the ejector pin positioning mechanism rises to fit around the outer periphery of the ejector pin and positions the ejector pin so that the ejector pin is aligned with the cartridge slot inside the syringe.

[0022] S4. First push: The push rod pushing mechanism pushes the push rod, pushing the push rod's needle into the syringe on the syringe clamping mechanism, until the needle is a specified distance away from the drug cartridge slot inside the syringe;

[0023] S5, Lowering and Returning: The ejector pin positioning mechanism opens and lowers and returns to its original position in preparation for positioning the next push rod;

[0024] S6. Second push: The push rod pushing mechanism continues to push the push rod until the head of the rod enters the syringe, completing the assembly of the push rod and the syringe.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] The syringe plunger assembly device of the present invention enables precise assembly of the syringe and plunger, resulting in higher production efficiency and lower production costs compared to manual assembly. The positioning mechanism of the ejector pin prevents misalignment between the plunger and syringe, reducing the probability of plunger damage. The compression mechanism squeezes the plunger body, narrowing the head of the plunger, facilitating its assembly into the syringe. This syringe plunger assembly device improves production efficiency and quality, avoids misalignment between the plunger and syringe, and reduces the probability of plunger damage and production costs.

[0027] This syringe plunger assembly method enables precise assembly of the syringe and plunger, offering higher production efficiency and lower production costs compared to manual methods. The positioning mechanism of the ejector pin prevents misalignment between the plunger and syringe, reducing the probability of plunger damage. The compression mechanism shrinks the plunger head, facilitating its insertion into the syringe. This syringe plunger assembly method improves production efficiency and quality, avoids misalignment between the plunger and syringe, and reduces the probability of plunger damage and production costs. Attached Figure Description

[0028] Figure 1 This is an assembly diagram of the plunger and syringe.

[0029] Figure 2 This is a three-dimensional structural schematic diagram of the syringe plunger assembly device of the present invention.

[0030] Figure 3 This is a front view schematic diagram of the syringe plunger assembly device of the present invention.

[0031] Figure 4 This is a top view of the syringe plunger assembly device of the present invention.

[0032] Figure 5 This is a partial structural schematic diagram of the syringe plunger assembly device of the present invention.

[0033] Figure 6 This is a first-view perspective three-dimensional structural diagram of the translation seat of the syringe plunger assembly device of the present invention.

[0034] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0035] Figure 8 This is a second-view three-dimensional structural diagram of the translation seat of the syringe plunger assembly device of the present invention.

[0036] Figure 9 yes Figure 8 Enlarged view of point B in the middle.

[0037] Figure 10 This is a side view of the translational seat of the syringe plunger assembly device of the present invention.

[0038] The labels in the diagram represent:

[0039] 1. Push rod spacing mechanism; 2. Push rod pushing mechanism; 21. Lifting seat; 22. Translation seat; 221. Tightening detection mechanism; 23. Rod positioning seat; 231. Positioning groove; 24. Lifting drive mechanism; 25. Translation drive mechanism; 3. Syringe clamping mechanism; 31. Syringe upper support assembly; 32. Syringe lower pressing assembly; 4. Push rod; 41. Ejector needle; 42. Rod body; 5. Push rod translation and transfer mechanism; 6. Syringe; 61. Drug cartridge slot; 7. Ejector needle positioning mechanism; 71. Lifting mechanism; 72. Gripper; 721. Left positioning sleeve groove; 722. Right positioning sleeve groove; 73. Opening and closing drive component; 8. Extrusion mechanism; 81. Clamping block; 82. Opening and closing drive component. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] As shown in this disclosure and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect.

[0042] Example 1:

[0043] Figures 2 to 10An embodiment of the syringe plunger assembly device of the present invention is shown. The syringe plunger assembly device includes a plunger splitting mechanism 1, a plunger pushing mechanism 2, and a syringe clamping mechanism 3 arranged in sequence. A plunger translation and transfer mechanism 5 is provided between the plunger splitting mechanism 1 and the plunger pushing mechanism 2 for translating and transferring the plunger 4 on the plunger splitting mechanism 1 to the plunger pushing mechanism 2. The plunger pushing mechanism 2 is used to push the plunger 4 into the syringe 6 on the syringe clamping mechanism 3. A liftable and openable ejector pin positioning mechanism 7 is provided between the plunger pushing mechanism 2 and the syringe clamping mechanism 3. A squeezing mechanism 8 is provided on the plunger pushing mechanism 2 for squeezing the rod body 42 to reduce the head of the rod body 42.

[0044] Syringe plunger assembly process: First, the plunger is spaced by the plunger spacing mechanism 1 to increase the spacing; Second, the plunger translation and transfer mechanism 5 transfers the plunger 4, which has been spaced by the plunger spacing mechanism 1, to the plunger pushing mechanism 2; Third, the squeezing mechanism 8 squeezes the rod body 42 to reduce the head of the rod body 42; The ejector pin positioning mechanism 7 rises to fit around the ejector pin 41 and positions the ejector pin 41 so that the ejector pin 41 is aligned with the drug cartridge slot 61 inside the syringe 6; Fourth, the plunger pushing mechanism 2 pushes the plunger 4, pushing the ejector pin 41 of the plunger 4 into the syringe 6 on the syringe clamping mechanism 3, until the ejector pin 41 is a specified distance away from the drug cartridge slot 61 inside the syringe 6; Fifth, the ejector pin positioning mechanism 7 opens and descends back to its original position to prepare for positioning the next plunger 4; Sixth, the plunger pushing mechanism 2 continues to push the plunger 4 until the head of the rod body 42 enters the syringe 6, completing the assembly of the plunger 4 and the syringe 6.

[0045] This syringe plunger assembly device enables precise assembly of the syringe 6 and plunger 4, resulting in higher production efficiency and lower production costs compared to manual assembly. The positioning mechanism 7 prevents misalignment between the plunger 4 and syringe 6, reducing the probability of plunger 4 damage. The compression mechanism 8 compresses the rod 42, narrowing its head, thus facilitating its assembly into the syringe 6. This syringe plunger assembly device improves production efficiency and quality, prevents misalignment between the plunger 4 and syringe 6, and reduces the probability of plunger 4 damage and production costs.

[0046] In this embodiment, the push rod pushing mechanism 2 includes a lifting seat 21, a translation seat 22, multiple rod positioning seats 23 arranged side by side on the translation seat 22, a lifting drive mechanism 24 for driving the lifting seat 21 to rise and fall, and a translation drive mechanism 25 for driving the translation seat 22 to reciprocate towards the syringe clamping mechanism 3. The squeezing mechanism 8 is disposed on the translation seat 22. The lifting drive mechanism 24 drives the lifting seat 21 to rise and fall, thereby driving the rod positioning seats 23 to rise and fall. The translation drive mechanism 25 drives the translation seat 22 to reciprocate towards the syringe clamping mechanism 3, thereby realizing the pushing of the push rod 4. The structure is simple and the operation is convenient.

[0047] In this embodiment, the extrusion mechanism 8 includes multiple extrusion components, each located on the front side of the rod positioning seat 23. The extrusion components are located on the front side of the rod positioning seat 23 to facilitate clamping the rod 42 of the push rod 4.

[0048] In this embodiment, as Figure 7 and Figure 10 As shown, the extrusion assembly includes a pair of clamping blocks 81 disposed on the translation seat 22 and an opening and closing drive member 82 for driving the pair of clamping blocks 81 to open and close. After the rod body 42 of the push rod 4 is placed on the rod body positioning seat 23, the head of the rod body 42 extends from the front of the rod body positioning seat 23. The opening and closing drive member 82 drives the pair of clamping blocks 81 to abut together, so as to extrude the forward-extending part of the rod body 42 of the push rod 4, thereby reducing the opening of the head of the rod body 42.

[0049] In this embodiment, as Figure 7 As shown, the rod positioning seat 23 is provided with a positioning groove 231 that matches the rod 42. The positioning groove 231 positions the rod 42 placed on it, preventing the rod 42 from moving left or right. Specifically, the opening of the positioning groove 231 faces upward, making it easy to put the push rod 4 up and down.

[0050] In this embodiment, as Figure 9As shown, the ejector pin positioning mechanism 7 includes multiple lifting mechanisms 71 located on the front side of each pair of rod positioning seats 23. Each lifting mechanism 71 is equipped with a pair of grippers 72 for holding the positioning ejector pin 41. The lifting mechanism 71 is equipped with an opening and closing drive member 73 for driving the pair of grippers 72 to open and close. The lifting mechanism 71 is mounted on the translation seat 22. After the push rod 4 is translated and transferred to the rod positioning seat 23, the squeezing mechanism 8 squeezes the rod 42 to reduce the head of the rod 42. The lifting mechanism 71 drives the pair of grippers 72 to rise to both sides of the ejector pin 41. The opening and closing drive member 73 then drives the pair of grippers 72 to abut against the outer periphery of the ejector pin 41 to position the ejector pin 41 so that the ejector pin 41 is aligned with the drug cartridge slot 61 inside the syringe 6. After the ejector pin 41 of the push rod 4 is pushed into the syringe 6 on the syringe clamping mechanism 3, and the ejector pin 41 is a specified distance away from the drug cartridge slot 61 inside the syringe 6, the opening and closing drive 73 drives the pair of grippers 72 to open, and the lifting mechanism 71 then drives the pair of grippers 72 to descend back to their original position, so as to prevent the grippers 72 from obstructing the push rod pushing mechanism 2 from continuing to push the push rod 4. The lifting mechanism 71 and the squeezing mechanism 8 are both set on a translation seat 22 to achieve joint translation. In this way, after the ejector pin positioning mechanism 7 positions the ejector pin 41, it will not move relative to the ejector pin 41, thus preventing wear on the ejector pin 41.

[0051] In this embodiment, the bottom end of each pair of grippers 72 is rotatably connected to the lifting mechanism 71, and the top end is provided with a left positioning sleeve groove 721 and a right positioning sleeve groove 722, which are arranged alternately. The openings of the left positioning sleeve groove 721 and the right positioning sleeve groove 722 face each other. The opening and closing drive member 73 drives the grippers 72 to rotate around the rotation axis to realize the approach and distance of the left positioning sleeve groove 721 and the right positioning sleeve groove 722. During positioning, the left positioning sleeve groove 721 is fitted onto the ejector pin 41 from the left side, and the right positioning sleeve groove 722 is fitted onto the ejector pin 41 from the right side. Specifically, in the pair of grippers 72, there are two left positioning sleeve grooves 721, and the right positioning sleeve groove 722 corresponds to the middle position of the two left positioning sleeve grooves 721. In this way, during positioning, the limiting force on the ejector pin 41 in the left and right directions is more symmetrical, and the positioning is more stable. The positioning mechanism 7 is used to position the ejector pin 41. After positioning, the opening range is large, which provides good avoidance of the forward movement of the rod 42 and the ability to avoid other parts.

[0052] In this embodiment, the translation base 22 is equipped with a clamping detection mechanism 221 on the rear side of each rod positioning seat 23 for detecting whether the push rod 4 has been pushed into the syringe 6. The clamping detection mechanism 221 includes a push rod cylinder and a thrust sensor mounted on the push rod cylinder. The push rod cylinder acts on the tail of the rod 42 of the push rod 4. Through the pressure regulation of the precision pressure regulating valve, the push rod 4 is protected by thrust. When the thrust is too large, the thrust sensor on the push rod cylinder alarms, indicating that the push rod 4 has not been pushed in, and the pushing stops. A vibrator can also be installed on the translation base 22. The thrust sensor is connected to the vibrator signal. After the thrust sensor alarms, the vibrator is started to push the push rod 4 again, so that the needle 41 of the push rod 4 enters the syringe 6. Each push rod cylinder is connected to the air source through the air distribution assembly to achieve unified control and effectively reduce the number and length of air tubes.

[0053] In this embodiment, the syringe clamping mechanism 3 includes a liftable syringe upper support assembly 31 and a liftable syringe lowering assembly 32. The syringe lowering assembly 32 and the syringe upper support assembly 31 are arranged vertically to clamp the syringe 6. Both the syringe upper support assembly 31 and the syringe lowering assembly 32 can be raised and lowered to meet the requirements of continuous operation of the syringe 6. That is, the syringe 6 can be first pushed upward on the conveyor line by the syringe upper support assembly 31, and then pressed down by the syringe lowering assembly 32 to clamp it.

[0054] Example 2:

[0055] A syringe plunger assembly method, using the aforementioned syringe plunger assembly device, includes the following steps:

[0056] S1, Spacing: Push rod 4 is spaced by push rod spacing mechanism 1 to increase the spacing;

[0057] S2, Transfer: The push rod translation transfer mechanism 5 transfers the push rod 4, which has been separated by the push rod separation mechanism 1, to the push rod pushing mechanism 2;

[0058] S3, Narrowing and Positioning: The extrusion mechanism 8 extrudes the rod 42 to narrow the head of the rod 42; the ejector pin positioning mechanism 7 rises to fit around the outer periphery of the ejector pin 41 and positions the ejector pin 41 so that the ejector pin 41 is aligned with the drug cartridge slot 61 inside the syringe 6.

[0059] S4. First push: The push rod pushing mechanism 2 pushes the push rod 4, pushing the pin 41 of the push rod 4 into the syringe 6 on the syringe clamping mechanism 3, until the pin 41 is at a specified distance (preferably 1mm) from the drug cartridge slot 61 inside the syringe 6.

[0060] S5, Lowering and Returning: The ejector pin positioning mechanism 7 opens and lowers and returns to its original position in preparation for positioning the next push rod 4;

[0061] S6. Second push: The push rod pushing mechanism 2 continues to push the push rod 4 until the head of the rod 42 enters the syringe 6, completing the assembly of the push rod 4 and the syringe 6.

[0062] This syringe plunger assembly method enables precise assembly of the syringe 6 and plunger 4, resulting in higher production efficiency and lower production costs compared to manual assembly. The positioning mechanism 7 prevents misalignment between the plunger 4 and syringe 6, reducing the probability of plunger 4 damage. The compression mechanism 8 compresses the rod 42, narrowing its head, thus facilitating its assembly into the syringe 6. This syringe plunger assembly method improves production efficiency and quality, avoids misalignment between the plunger 4 and syringe 6, and reduces the probability of plunger 4 damage and production costs.

[0063] Multiple push rods 4 (usually 10) are first placed in a tray. The push rods 4 in the tray are synchronously grasped by the robot and sent to the push rod spacing mechanism 1. The push rod spacing mechanism 1 changes the spacing of the push rods 4 from 20mm to 60mm to facilitate subsequent assembly. Then, the push rod translation and transfer mechanism 5 simultaneously picks up the push rods 4 from the push rod spacing mechanism 1 and sends them to the push rod pushing mechanism 2, ready for assembly.

[0064] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A syringe plunger assembly device, characterized in that: The device includes a push rod separating mechanism (1), a push rod pushing mechanism (2), and a syringe clamping mechanism (3) arranged in sequence. Between the push rod separating mechanism (1) and the push rod pushing mechanism (2), there is a push rod translation and transfer mechanism (5) for transferring the push rod (4) on the push rod separating mechanism (1) to the push rod pushing mechanism (2). The push rod pushing mechanism (2) is used to push the push rod (4) into the syringe (6) on the syringe clamping mechanism (3). Between the push rod pushing mechanism (2) and the syringe clamping mechanism (3), there is a liftable and openable ejector pin positioning mechanism (7). The push rod pushing mechanism (2) is equipped with a squeezing mechanism (8). The squeezing mechanism (8) is used to squeeze the rod (42) to reduce the head of the rod (42); the push rod pushing mechanism (2) includes a translation seat (22) and a plurality of rod positioning seats (23) arranged side by side on the translation seat (22); the ejector pin positioning mechanism (7) includes a plurality of lifting mechanisms (71) located in front of each pair of rod positioning seats (23), each of the lifting mechanisms (71) is provided with a pair of grippers (72) for holding the positioning ejector pin (41), the lifting mechanism (71) is provided with an opening and closing drive member (73) for driving the pair of grippers (72) to open and close, and the lifting mechanism (71) is arranged on the translation seat (22).

2. The syringe plunger assembly device according to claim 1, characterized in that: The push rod pushing mechanism (2) further includes a lifting seat (21), a lifting drive mechanism (24) for driving the lifting seat (21) to rise and fall, and a translation drive mechanism (25) for driving the translation seat (22) to reciprocate in the direction of the syringe clamping mechanism (3). The squeezing mechanism (8) is located on the translation seat (22).

3. The syringe plunger assembly device according to claim 2, characterized in that: The extrusion mechanism (8) includes multiple extrusion components, each of which is located on the front side of each rod positioning seat (23).

4. The syringe plunger assembly device according to claim 3, characterized in that: The extrusion assembly includes a pair of clamps (81) disposed on a translation seat (22) and an opening and closing drive (82) for driving the pair of clamps (81) to open and close.

5. The syringe plunger assembly device according to claim 1, characterized in that: The rod positioning seat (23) is provided with a positioning groove (231) that is adapted to the rod (42).

6. The syringe plunger assembly device according to claim 1, characterized in that: The bottom end of each pair of grippers (72) is rotatably connected to the lifting mechanism (71), and the top end is provided with a left positioning sleeve groove (721) and a right positioning sleeve groove (722), which are arranged alternately.

7. The syringe plunger assembly device according to claim 2, characterized in that: The translation seat (22) is provided with a clamping detection mechanism (221) on the rear side of each rod positioning seat (23) for detecting whether the push rod (4) is pushed into the syringe (6).

8. The syringe plunger assembly device according to any one of claims 1 to 7, characterized in that: The syringe clamping mechanism (3) includes a liftable syringe upper support assembly (31) and a liftable syringe lower pressure assembly (32), which are arranged vertically to clamp the syringe (6).

9. A method for assembling a syringe plunger, characterized in that, The syringe plunger assembly device according to any one of claims 1 to 8 is used, comprising the following steps: S1, Spacing: The push rod (4) is spaced by the push rod spacing mechanism (1) to increase the spacing; S2, Transfer: The push rod translation transfer mechanism (5) transfers the push rod (4) after it has been separated by the push rod splitting mechanism (1) to the push rod pushing mechanism (2); S3, Narrowing and Positioning: The squeezing mechanism (8) squeezes the rod (42) to narrow the head of the rod (42); the ejector pin positioning mechanism (7) rises to fit around the outer periphery of the ejector pin (41) and positions the ejector pin (41) so that the ejector pin (41) is aligned with the drug cartridge slot (61) inside the syringe (6); S4, First push: The push rod pushing mechanism (2) pushes the push rod (4) and pushes the needle (41) of the push rod (4) into the syringe (6) on the syringe clamping mechanism (3) until the needle (41) is a specified distance away from the drug column slot (61) inside the syringe (6); S5, Lowering back to position: The ejector pin positioning mechanism (7) opens and lowers back to position in preparation for positioning the next push rod (4); S6. Second push: The push rod pushing mechanism (2) continues to push the push rod (4) until the head of the rod (42) enters the syringe (6), completing the assembly of the push rod (4) and the syringe (6).

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