Clamping mechanism for glass needle cylinder of pre-filled syringe

Abstract

The invention discloses a clamping mechanism for a glass needle cylinder of a pre-filled syringe. The clamping mechanism comprises a connecting seat on a clamping jaw head body and a clamping jaw rod, the clamping jaw head body comprises a hollow sleeve, a columnar end is arranged at the top end of the sleeve, a threaded hole used for installing a bottle support is formed in the center of the columnar end, at least two clamping jaw supporting bodies are arranged on the outer circle of the columnar end, and inclined holes allowing clamping jaw rods to pass through are formed in the clamping jaw supporting bodies. The center lines of all the inclined holes and the center line of the threaded hole for mounting the bottle holder are intersected at one point; the spring shaft is arranged from the lower part of the hollow sleeve, the upper end part of the spring shaft is provided with a mounting hole for allowing the connecting pin to pass through, the spring shaft is sleeved with a spring, the spring shaft is pulled downwards, the clamping jaw rod is driven to open through the spring shaft and the connecting seat, and the glass needle cylinder conveyed from the previous station falls on the bottle support; and when the downward pulling force of the spring shaft is loosened, the spring pushes the spring shaft and the connecting seat upwards to drive the clamping jaw rod to clamp the glass needle cylinder. The clamp does not need to be replaced frequently, and production efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of pre-filled syringe glass barrel forming and processing, and specifically relates to a pre-filled syringe glass barrel clamping mechanism. Background Art

[0002] Prefilled syringes integrate "drug storage" and "injection functions" into one. They are highly favored in the biopharmaceutical field due to their advantages such as safety, convenience, high drug utilization rate, and prevention of secondary cross-contamination. They are accepted by more and more pharmaceutical companies, clinical medical staff and patients, and therefore the market demand continues to rise.

[0003] Prefilled syringe glass barrel forming equipment, specifically as disclosed in the Chinese invention patent with publication number CN1850673A and the name of prefilled syringe glass barrel forming machine, the specific implementation method of the specification states: "As Figure 1 , 2 and Figure 3 As shown, the head forming mechanism includes glass tube chucks 8 and a gas device distributed on the periphery of the vertical forming disc 7. The forming disc 7 is connected to the intermittent divider. There are two vertical forming discs with corresponding mounting holes. The corresponding mounting holes are equipped with rollers. Each roller 16 is equipped with a corresponding pulley 24. The belt 15 is sleeved on the pulley 24 and the power shaft. The front end of the roller 16 is fixed with a glass tube chuck 8. The glass tube chuck 8 has a clamping claw 20. The clamping claw 20 is installed in the inclined hole of the guide block 19. The other end of the clamping claw 20 is hinged to the sleeve 21 on the roller 16. There is a tension spring 23 between the sleeve 21 and the forming disc 7. The opening fork 22 is arranged corresponding to the sleeve 21. At the opening position of the glass tube clamp 8, a reciprocating swing rod 28 for triggering the opening fork 22 is arranged. A driving core rod 25 adapted to the glass tube clamp is arranged in the roller 16. At the position corresponding to the opening position of the glass tube clamp, a reciprocating swing rod 27 for triggering the driving core rod is arranged at the rear end of the driving core rod 25.

[0004] The clamping mechanism of the glass syringe of the prefilled syringe is the core component of the syringe forming machine, which has extremely high precision requirements and the radial runout requirement is less than 0.1mm during operation. The clamping jaw head body is a key part, which has very high dimensional accuracy and form and position tolerance requirements. Conventional equipment cannot meet the processing accuracy requirements.

[0005] The technology disclosed in this document focuses on the overall pre-filled syringe glass barrel forming equipment itself, wherein the clamping mechanism disclosed therein, namely, "glass tube chuck 8, glass tube chuck 8 having clamping claws 20", has insufficient accuracy during operation and excessive radial runout.

[0006] In the existing published patent documents, the Chinese invention patent with application publication number CN 112456768 A, application publication date 2021.03.09, and invention name "Prefilling bottle making machine B part and its working method" records in paragraph

[0034] of its specification "S43. Blowing and slag removal: Turn on the gas source, blow the gas into the gas delivery pipe 7, and discharge it into the corresponding B part chuck 6 sleeve 10 through the blowing pipe 9 of the slag blowing and cleaning station 2. The gas is blown from the B part chuck 6 sleeve 10 to the clamping jaw 11 to discharge slag, and the waste slag at the chuck is discharged outward, which can fall into the waste slag bucket located at the front end of the clamping jaw 11 on the slag blowing and cleaning station 2."

[0007] The clamp disclosed in this patent document still has no precision requirements and only realizes the basic function of clamping.

[0008] In view of the above shortcomings of the prior art, the present invention is proposed. Summary of the invention

[0009] In order to solve the problem of clamping accuracy during the molding production process of a glass syringe of a prefilled syringe, the present invention provides a clamping mechanism for the glass syringe of a prefilled syringe.

[0010] The technical solution provided by the present invention is:

[0011] A pre-filled syringe glass syringe clamping mechanism includes a clamp head assembly component, wherein the clamp head assembly component includes a clamp head body 3, a connecting seat 6 assembled on the clamp head body 3, and a clamp rod 19; wherein,

[0012] The clamp head body 3 comprises a hollow sleeve 301, a cylindrical end 302 is provided at the top of the sleeve, a threaded hole 303 for mounting the bottle holder 1 is provided at the center of the cylindrical end 302, at least two clamp supports 304 are provided on the outer circumference of the cylindrical end 302, and an oblique hole 305 for accommodating the clamp rod 19 is provided on the clamp supports 304, wherein the center lines of all the oblique holes 305 intersect at one point with the center line of the threaded hole 303 for mounting the bottle holder 1;

[0013] The connecting seat 6 is sleeved under the columnar end 302, and a hinge seat 603 corresponding to the clamping claw support body 304 is arranged at the lower part of the connecting seat 6, and a hinge connecting rod 5 is hinged on the hinge seat 603, and the other end of the hinge connecting rod 5 is connected to the lower part of the clamping claw rod 19;

[0014] The hollow sleeve 301 has a waist-shaped hole 306 in the middle for accommodating the connection pin 18 to pass through. The connection seat 6 is a column with a central through hole. The inner circle of the central through hole has a waist-shaped groove 601 at the lower end for accommodating the two ends of the connection pin 18 to pass through. The inner circle is located at the upper part of the waist-shaped groove 601 and has an annular groove 602 for accommodating the two ends of the connection pin 18.

[0015] It also includes a clamping claw rod control assembly installed in the clamping claw head body 3, the clamping claw rod control assembly includes a spring shaft 14 installed from the lower part of the hollow sleeve 301, the upper end of the spring shaft 14 is provided with a mounting hole 1401 for accommodating the connection pin 18 to pass through, the spring shaft 14 is sleeved with a spring 8, and a transition sleeve 15 is provided below the spring 8;

[0016] The specific process of sleeve-mounting the connecting seat 6 under the columnar end 302 is as follows: insert the connecting seat 6 from the lower end of the hollow sleeve 301 of the clamping jaw head body 3 and move it upward to exceed the waist-shaped hole 306, rotate the spring shaft 14, align the mounting hole 1401 at the upper end of the spring shaft 14 through which the connecting pin 18 passes and the waist-shaped hole 306 in the middle of the hollow sleeve 301 through which the connecting pin 18 passes, then pass the connecting pin 18 through the waist-shaped hole 306 and the mounting hole 1401 in turn, rotate the connecting seat 6 to align the waist-shaped hole at the lower end thereof. After the groove 601 is formed, the connecting seat 6 moves downward, and after the two ends of the connecting pin 18 pass through the waist-shaped groove 601 at the lower part of the connecting seat 6, the connecting seat 6 is rotated again to make the two ends of the connecting pin 18 fit into the annular groove 602; the spring shaft 14 is pulled down, and the clamping claw rod 19 is driven to open through the spring shaft 14 and the connecting seat 6, and the glass syringe 21 delivered from the previous station falls on the bottle holder 1; when the downward pulling force of the spring shaft 14 is released, the spring 8 pushes the spring shaft 14 and the connecting seat 6 upward, driving the clamping claw rod 19 to clamp the glass syringe 21.

[0017] Preferably,

[0018] A threaded sleeve 12 is screwed onto the lower end of the spring shaft 14 , and a locking nut 13 is installed below the threaded sleeve 12 .

[0019] Preferably,

[0020] A fixing screw hole 307 for accommodating a fixing screw 2 is provided on the side of the columnar end 302 . The fixing screw 2 is used to fix the bottle holder 1 .

[0021] Preferably,

[0022] It also includes a fixed matching component installed on the clamp head body 3, and the fixed matching component includes a fixing seat 9, an end cover 7, a bearing 17, a spacer sleeve 16, and a locking sleeve 11 installed in sequence. The installation order is: press a bearing 17 into the upper step hole of the fixing seat 9, and then install the end cover 7 on the upper end of the fixing seat 9 with screws to tighten the bearing 17, then insert the aforementioned installed components from the lower end of the hollow sleeve 301, and then insert the spacer sleeve 16, and then put another bearing 17 on the outer circle of the lower end of the hollow sleeve 301, screw in the locking sleeve 11 to tighten the whole, and tighten it with screws.

[0023] Preferably,

[0024] A friction wheel 10 is also installed between the fixing seat 9 and the locking sleeve 11 .

[0025] Preferably,

[0026] The upper portion of the clamping claw rod 19 is also provided with a semicircular hole 1901 for mounting the carbon rod 20 .

[0027] Preferably,

[0028] The hollow sleeve 301 , the columnar end 302 and the clamping jaw support 304 of the clamping jaw head body 3 are integrally formed.

[0029] Preferably,

[0030] The hinged connecting rod 5 is H-shaped and is hingedly connected via a hinge pin 4 .

[0031] Beneficial effects:

[0032] Advantages and technical effects of the invention:

[0033] 1. This mechanism can adapt to the production of glass syringes of different specifications, without the need to frequently replace fixtures, thus improving production efficiency;

[0034] 2. This mechanism adopts a three-claw clamping mode, and the three clamping claws open and close synchronously, realizing fast and precise clamping operation;

[0035] 3. The upper part of the jaw head is designed with an opening to facilitate cleaning of glass residues;

[0036] 4. The mechanism has a high degree of automation and is easy to maintain;

[0037] 5. The clamping surface is clamped by carbon rods, which not only provides sufficient clamping force but also effectively protects the surface quality of the glass syringe;

[0038] 6. The work efficiency of this organization has been greatly improved on the original basis, and the product quality is stable.

[0039] Actual use effect:

[0040] This mechanism has been widely used in pre-filled glass syringe forming machines. The equipment runs continuously and stably, and the qualified rate of finished glass syringes is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention;

[0042] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure;

[0043] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the middle clamping jaw head body 3;

[0044] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the middle articulated connecting rod 5;

[0045] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the middle connecting seat 6;

[0046] Figure 6 for Figure 1 A schematic diagram of the three-dimensional structure of the middle fixing seat 9;

[0047] Figure 7 for Figure 1 A schematic diagram of the three-dimensional structure of the middle locking sleeve 11;

[0048] Figure 8 for Figure 1 A schematic diagram of the three-dimensional structure of the middle spring shaft 14;

[0049] Fig. 9 for Figure 1 A schematic diagram of the three-dimensional structure of the middle clamping claw rod 19;

[0050] Meaning of the symbols in the attached drawings:

[0051] Bottle holder 1, set screw 2;

[0052] The clamping jaw head body 3, the hollow sleeve 301, the cylindrical end 302, the threaded hole 303, the clamping jaw support body 304, the oblique hole 305, the waist-shaped hole 306, and the tightening screw hole 307;

[0053] Hinge pin 4, hinge connecting rod 5;

[0054] Connecting seat 6, waist-shaped groove 601, annular groove 602, hinge seat 603;

[0055] End cover 7, spring 8, fixing seat 9, friction wheel 10, locking sleeve 11, threaded sleeve 12, anti-loosening nut 13;

[0056] Spring shaft 14, mounting hole 1401;

[0057] Transition sleeve 15, spacer sleeve 16, bearing 17, connecting pin 18;

[0058] Claw rod 19, semicircular hole 1901;

[0059] Carbon rod 20, glass syringe 21. DETAILED DESCRIPTION

[0060] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention. Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure. Figure 1 , Figure 2 As shown in the figure and in combination with other figures, a prefilled syringe glass syringe clamping mechanism of the present invention includes a clamping jaw head assembly component, wherein the clamping jaw head assembly component includes a clamping jaw head body 3, a connecting seat 6 assembled on the clamping jaw head body 3, and a clamping jaw rod 19; wherein,

[0062] like Figure 3 As shown in the figure, the clamp head body 3 includes a hollow sleeve 301, a columnar end 302 is provided at the top of the hollow sleeve 301, a threaded hole 303 is provided in the center of the columnar end 302 for mounting the bottle holder 1, and at least two clamping jaw supports 304 are provided on the outer circumference of the columnar end 302, and three clamping jaw supports 304 are preferably provided in this embodiment. The hollow sleeve 301, the columnar end 302 and the clamping jaw supports 304 of the clamp head body 3 are integrally formed.

[0063] The clamping claw support body 304 is provided with an oblique hole 305 for accommodating the clamping claw rod 19 to pass through, wherein the center lines of all the oblique holes 305 intersect with the center line of the threaded hole 303 for mounting the bottle holder 1 at one point;

[0064] The clamping claw rod 19 ( Fig. 9 A semicircular hole 1901 for mounting the carbon rod 20 is also provided on the upper portion of the carbon rod 20.

[0065] A fixing screw hole 307 for accommodating a fixing screw 2 is provided on the side of the columnar end 302 . The fixing screw 2 is used to fix the bottle holder 1 .

[0066] The connecting seat 6 is mounted below the columnar end 302, and a hinge seat 603 (corresponding to the clamping claw support body 304) is arranged at the lower part of the connecting seat 6. Figure 5 ), the hinge seat 603 is hinged with an articulated connecting rod 5, and the articulated connecting rod 5 is H-shaped ( Figure 4 As shown in the figure, the upper end of the articulated link 5 is articulated to the lower part of the clamping claw rod 19 through the articulated pin 4, and the lower end of the articulated link 5 is articulated to the articulated seat 603 through the articulated pin 4.

[0067] The hollow sleeve 301 has a waist-shaped hole 306 ( Figure 3 The connecting seat 6 is a column with a through hole ( Figure 5 The lower end of the inner circle of the through hole is provided with a waist-shaped groove 601 for accommodating the two ends of the connecting pin 18, and the inner circle is located at the upper part of the waist-shaped groove 601, and an annular groove 602 ( Figure 1 )

[0068] The invention also includes a clamping rod control assembly installed in the clamping head body 3, wherein the clamping rod control assembly includes a spring shaft 14 inserted from the lower part of the hollow sleeve 301, and an installation hole 1401 ( Figure 8 As shown in FIG. 1 , a spring 8 is mounted on the spring shaft 14, and a transition sleeve 15 is provided below the spring 8;

[0069] The specific process of sleeve-fitting the connection seat 6 under the columnar end 302 is as follows: insert the connection seat 6 from the lower end of the hollow sleeve 301 of the clamping jaw head body 3 and then move it upward to exceed the waist-shaped hole 306, rotate the spring shaft 14, align the mounting hole 1401 at the upper end of the spring shaft 14 for accommodating the connection pin 18 and the waist-shaped hole 306 in the middle of the hollow sleeve 301 for accommodating the connection pin 18, and then pass the connection pin 18 through the waist-shaped hole 306 and the mounting hole 1401 in sequence, rotate the connection seat 6 to align the waist-shaped groove 601 at its lower end, move the connection seat 6 downward, and after the two ends of the connection pin 18 pass through the waist-shaped groove 601 at the lower part of the connection seat 6, rotate the connection seat 6 again to make the two ends of the connection pin 18 snap into the annular groove 602;

[0070] A threaded sleeve 12 is screwed onto the lower end of the spring shaft 14 , and a locking nut 13 is installed below the threaded sleeve 12 .

[0071] Pull down the spring shaft 14, drive the clamping claw rod 19 to open through the spring shaft 14 and the connecting seat 6, and the glass syringe 21 delivered from the previous station falls on the bottle holder 1; when the downward pulling force of the spring shaft 14 is released, the spring 8 pushes the spring shaft 14 and the connecting seat 6 upward, drive the clamping claw rod 19 to clamp the glass syringe 21.

[0072] It also includes a fixed matching component installed on the clamping jaw head body 3, and the fixed matching component includes a fixing seat 9 ( Figure 6 ), end cover 7, bearing 17, spacer 16, locking sleeve 11 ( Figure 7As shown in the figure, the installation sequence is: press a bearing 17 into the step hole at the upper end of the fixing seat 9, then install the end cover 7 on the upper end of the fixing seat 9 with screws, press the bearing 17, then insert the aforementioned installed components from the lower end of the hollow sleeve 301, then insert the spacer sleeve 16, and then put another bearing 17 on the outer circle of the lower end of the hollow sleeve 301, screw in the locking sleeve 11 to tighten the whole, and tighten it with screws.

[0073] A friction wheel 10 is also installed between the fixing seat 9 and the locking sleeve 11 .

[0074] The assembly method of the present invention comprises the following steps:

[0075] Step S1, insert the spring shaft 14 from the lower part of the hollow sleeve 301 of the clamp head body 3, sleeve the spring 8 on the outer circle of the spring shaft 14, press the spring 8 with the transition sleeve 15, and fix the transition sleeve 15 and the hollow sleeve 301 with screws;

[0076] Step S2, insert the connecting seat 6 from the lower end of the hollow sleeve 301, so that the lower end of the connecting seat 6 exceeds the waist-shaped hole 306 of the clamp head body 3, and pass the connecting pin 18 through the waist-shaped hole 306 of the clamp head body 3 and the mounting hole 1401 of the spring shaft 14, then align the angle, move the connecting seat 6 downward, and let the two ends of the connecting pin 18 just pass through the waist-shaped groove 601 of the connecting seat 6, and then rotate the connecting seat 6, in this embodiment, rotate 60°, so that the connecting pin 18 is stuck in the annular groove 602 of the connecting seat 6.

[0077] Step S3, screw the bottle holder 1 into the threaded hole 303 at the center of the columnar end 302, install the lower ends of the three H-shaped hinged connecting rods 5 into the hinged seats 603 at the corresponding positions of the connecting seat 6 with the hinge pins 4, and then install the clamping claw rod 19 into the inclined hole 305 on the clamping claw support body 304.

[0078] The lower end of the clamping claw rod 19 is connected to the upper end of the H-shaped hinge connecting rod 5 by the hinge pin 4, and then the carbon rod 20 is inserted into the semicircular hole 1901 of the clamping claw rod 19 to ensure that the upper ends of the carbon rod 20 at three locations are flush.

[0079] Step S4, press a bearing 17 into the stepped hole at the upper end of the fixing seat 9, and then install the end cover 7 on the upper end of the fixing seat 9 with screws to tighten the bearing 17, then insert the aforementioned installed components from the lower end of the hollow sleeve 301, and then insert the spacer sleeve 16, and then successively insert another bearing 17 and the friction wheel 10 on the outer circle of the lower end of the hollow sleeve 301, screw in the locking sleeve 11 to tighten the whole, and tighten it with screws.

[0080] Step S5, screwing the threaded sleeve 12 into the lower end of the spring shaft 14.

[0081] Step S6, the whole mechanism is installed on the workbench of the molding machine with screws, and the height of the bottle holder 1 is adjusted according to the length of the glass syringe 21. After the adjustment, the set screw 2 is screwed into the set screw hole 307, and the bottle holder 1 is fixed with the set screw 2; according to the diameter of the glass syringe 21, the screwing length of the threaded sleeve 12 is adjusted. After the adjustment, the anti-loosening nut 13 is used to tighten it to prevent it from loosening.

[0082] The working principle of this organization is as follows:

[0083] When the threaded sleeve 12 is pulled downward, the clamping claw rod 19 is driven to open through the spring shaft 14 and the connecting seat 6, and the glass syringe 21 delivered from the previous station falls on the bottle holder 1; when the downward pulling force of the threaded sleeve 12 is released, the spring 8 pushes the spring shaft 14 and the connecting seat 6 upward, driving the clamping claw rod 19 to clamp the glass syringe 21;

[0084] At the same time, the friction wheel 10 drives the clamping jaw head body 3 to rotate to realize the self-rotation of the mechanism, so as to complete the flanging of the glass syringe 21.

[0085] By adjusting the height of the bottle holder 1, it can meet the needs of glass syringes 21 of different lengths;

[0086] By adjusting the screwing length of the threaded sleeve 12, the stroke of the connecting seat 6 is changed, thereby changing the telescopic length of the clamping claw rod 19 to adapt to the clamping of glass syringes 21 with different diameters.

[0087] The clamp head body 3 is the key part of the mechanism, and its accuracy directly affects the molding quality of the glass syringe 21. The dimensional accuracy and positional accuracy of the three oblique holes 305 are very important, especially the angular size and angle consistency of the three oblique holes 305, which determine the matching accuracy of the three clamp rods 19. Traditional processing methods are difficult to meet the accuracy requirements, and a five-axis machine tool must be used to complete all processing in one clamping.

[0088] The described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A prefilled syringe glass barrel clamping mechanism, characterized in that: The invention comprises a clamping jaw head assembly component, wherein the clamping jaw head assembly component comprises a clamping jaw head body (3), a connecting seat (6) assembled on the clamping jaw head body (3), and a clamping jaw rod (19); wherein: The clamping jaw head body (3) comprises a hollow sleeve (301), the top of the sleeve is provided with a columnar end (302), the center of the columnar end (302) is provided with a threaded hole (303) for mounting the bottle holder (1), the outer circle of the columnar end (302) is provided with at least two clamping jaw supporting bodies (304), the clamping jaw supporting bodies (304) are provided with oblique holes (305) for accommodating the passage of the clamping jaw rod (19), wherein the center lines of all the oblique holes (305) intersect at one point with the center line of the threaded hole (303) for mounting the bottle holder (1); The connecting seat (6) is mounted below the columnar end (302), and a hinge seat (603) corresponding to the clamping claw support body (304) is arranged at the lower part of the connecting seat (6), and a hinge connecting rod (5) is hinged on the hinge seat (603), and the other end of the hinge connecting rod (5) is connected to the lower part of the clamping claw rod (19); The hollow sleeve (301) has a waist-shaped hole (306) in the middle for accommodating the connection pin (18) to pass through. The connection seat (6) is a column with a central through hole. The lower end of the inner circle of the central through hole is provided with a waist-shaped groove (601) for accommodating the two ends of the connection pin (18) to pass through. The inner circle is located at the upper part of the waist-shaped groove (601) and is provided with an annular groove (602) for accommodating the two ends of the connection pin (18); It also includes a clamping claw rod control assembly installed in the clamping claw head body (3), the clamping claw rod control assembly includes a spring shaft (14) installed from the lower part of the hollow sleeve (301), the upper end of the spring shaft (14) is provided with a mounting hole (1401) for accommodating the connection pin (18) to pass through, a spring (8) is sleeved on the spring shaft (14), and a transition sleeve (15) is provided below the spring (8); The specific process of sleeve-fitting the connecting seat (6) under the columnar end (302) is as follows: insert the connecting seat (6) from the lower end of the hollow sleeve (301) of the clamping claw head body (3) and move it upward to exceed the waist-shaped hole (306), rotate the spring shaft (14), align the mounting hole (1401) at the upper end of the spring shaft (14) through which the connecting pin (18) passes and the waist-shaped hole (306) at the middle of the hollow sleeve (301) through which the connecting pin (18) passes, then pass the connecting pin (18) through the waist-shaped hole (306) and the mounting hole (1401) in sequence, rotate the connecting seat (6) to align the waist-shaped groove (6) at the lower end thereof. 01), the connecting seat (6) moves downward, and after the two ends of the connecting pin (18) pass through the waist-shaped groove (601) at the bottom of the connecting seat (6), the connecting seat (6) is rotated again so that the two ends of the connecting pin (18) are clamped into the annular groove (602); the spring shaft (14) is pulled down, and the clamping claw rod (19) is driven to open through the spring shaft (14) and the connecting seat (6), and the glass syringe (21) delivered from the previous station falls on the bottle holder (1); when the downward pulling force of the spring shaft (14) is released, the spring (8) pushes the spring shaft (14) and the connecting seat (6) upward, driving the clamping claw rod (19) to clamp the glass syringe (21).

2. A prefilled syringe glass barrel clamping mechanism according to claim 1, characterized in that: A threaded sleeve (12) is screwed onto the lower end of the spring shaft (14), and a locking nut (13) is installed below the threaded sleeve (12).

3. A prefilled syringe glass barrel clamping mechanism according to claim 1, characterized in that: A fixing screw hole (307) for accommodating a fixing screw (2) is provided on the side of the columnar end (302), and the fixing screw (2) is used to fix the bottle holder (1).

4. A prefilled syringe glass barrel clamping mechanism according to claim 1, characterized in that: The invention also comprises a fixing matching component installed on the clamping jaw head body (3), wherein the fixing matching component comprises a fixing seat (9), an end cover (7), a bearing (17), a spacer sleeve (16), and a locking sleeve (11) which are installed in sequence, and the installation sequence is as follows: a bearing (17) is pressed into the step hole at the upper end of the fixing seat (9), and the end cover (7) is then installed on the upper end of the fixing seat (9) with screws to press the bearing (17), and then the above-mentioned installed components are inserted from the lower end of the hollow sleeve (301), and then the spacer sleeve (16) is inserted, and then another bearing (17) is inserted on the outer circle of the lower end of the hollow sleeve (301), and the locking sleeve (11) is screwed in to press the whole, and then it is tightened with screws.

5. A prefilled syringe glass barrel clamping mechanism according to claim 4, characterized in that: A friction wheel (10) is also installed between the fixing seat (9) and the locking sleeve (11).

6. A prefilled syringe glass barrel clamping mechanism according to claim 1, characterized in that: The upper portion of the clamping claw rod (19) is also provided with a semicircular hole (1901) for mounting the carbon rod (20).

7. A prefilled syringe glass barrel clamping mechanism according to claim 1, characterized in that: The hollow sleeve (301), the columnar end (302) and the clamping jaw support (304) of the clamping jaw head body (3) are integrally formed.

8. The prefilled syringe glass barrel clamping mechanism according to claim 1, characterized in that: The hinged connecting rod (5) is H-shaped and is hingedly connected via a hinge pin (4).

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