A pre-tightening device and method for pre-tightening bottle caps of pharmaceutical packaging bottles

Abstract

This invention discloses a pre-tightening device for pharmaceutical packaging bottle caps, comprising a frame, a turntable, a pre-tightening assembly, and a cap conveying device. The pre-tightening assembly and the cap conveying device are respectively fixedly installed on the frame. The turntable is rotatably installed on the frame and driven to rotate by a motor. The turntable can drive several packaging bottles to rotate intermittently, and they pass sequentially through the cap conveying device and the pre-tightening assembly. Each packaging bottle includes a bottle body and a cap, with the cap threadedly connected to the upper end of the bottle body. The pre-tightening assembly includes a first capping wheel, a second capping wheel, and a third capping wheel. The first, second, and third capping wheels abut against the outer periphery of the cap, and the third capping wheel is driven to rotate by a first motor to pre-tighten the cap. This invention can achieve accurate cap alignment, save alignment time for subsequent cap tightening, and improve production efficiency and processing quality.

Description

Technical Field

[0001] This invention relates to the field of pharmaceutical packaging technology, and more specifically, to a pre-tightening device for the cap of a pharmaceutical packaging bottle, and also to a method for pre-tightening the cap of a pharmaceutical packaging bottle. Background Technology

[0002] Pharmaceutical packaging has stringent requirements for sealing, standardization, and production efficiency. Tightening the bottle cap is a key process in the pharmaceutical packaging production line, which directly affects the subsequent sealing, storage, and usage effects.

[0003] On automated production lines for pharmaceutical packaging bottles, cap tightening is one of the core processes. Currently, most equipment lacks a dedicated pre-tightening station and alignment structure, relying solely on the final tightening mechanism to complete both alignment and tightening in one go. This results in a low tolerance for alignment errors, and after the caps are fastened to the bottle neck by the feeding mechanism, issues such as positional misalignment and angular distortion are common. If the equipment directly proceeds to the final tightening station, it requires a significant amount of time to align and correct the caps, not only lengthening the processing time per bottle and reducing the overall production line efficiency, but also easily leading to defects such as misaligned threads, cap wear, and seal failure due to inaccurate alignment.

[0004] Therefore, the present invention provides a new technical solution to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pre-tightening device and method for pre-tightening the cap of a pharmaceutical packaging bottle, so as to achieve accurate cap alignment, save the alignment time for subsequent cap tightening, and improve production efficiency and processing quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pre-tightening device for pharmaceutical packaging bottle caps includes a frame, a turntable, a pre-tightening assembly, and a cap conveying device, wherein the pre-tightening assembly and the cap conveying device are respectively fixedly installed on the frame;

[0008] The turntable is rotatably mounted on the frame and driven to rotate by a motor. The turntable can drive several packaging bottles to rotate intermittently and pass through the bottle cap conveying device and the pre-tightening assembly in sequence.

[0009] The packaging bottle includes a bottle body and a cap, wherein the cap is threadedly connected to the upper end of the bottle body;

[0010] The pre-tightening assembly includes a first capping wheel, a second capping wheel, and a third capping wheel. The first capping wheel, the second capping wheel, and the third capping wheel abut against the outer periphery of the cap body, and the third capping wheel is driven to rotate by a first motor to pre-tighten the cap body.

[0011] The present invention is further configured such that the turntable includes an upper disk and a lower disk, the upper disk and the lower disk being spaced apart in the vertical direction and rotating synchronously;

[0012] The upper disc has several limiting grooves, and the lower disc has several limiting grooves. The limiting grooves are arranged in a circular array and are arranged in a vertical direction.

[0013] The present invention is further configured such that a limiting component and a supporting component are fixedly installed on the frame, and the limiting component and the supporting component are both ring-shaped and are respectively spaced apart at the side end and bottom of the turntable;

[0014] The bottle body is respectively embedded in the limiting groove one and the limiting groove two and abuts against the inner circumference of the limiting member, and the bottom of the bottle body abuts against the upper end of the supporting member.

[0015] The present invention is further configured such that the pre-tightening assembly also includes a bracket, wherein the first capping wheel, the second capping wheel and the third capping wheel are respectively rotatably mounted on the bracket in the vertical direction, and the first capping wheel, the second capping wheel and the third capping wheel are distributed in a three-point manner along the outer periphery of the cap body, which can form a circumferential clamping of the cap body, and the first capping wheel and the second capping wheel are respectively elastically abutting against the outer periphery of the cap body.

[0016] The invention is further configured such that a telescopic rod is fixedly installed on the frame, a support block is fixedly connected to the upper end of the telescopic rod, the support block abuts against the bottom of the bottle, and the telescopic rod can drive the bottle to move in the vertical direction, so that the bottle has a first position and a second position relative to the turntable.

[0017] The present invention is further configured such that the first capping wheel, the second capping wheel and the third capping wheel are respectively provided with a conical portion and a cylindrical portion, and the conical portion and the cylindrical portion are integrally connected;

[0018] When the bottle body is in the first position, the cap body is located between the first capping wheel, the second capping wheel and the third capping wheel, and the outer periphery of the cap body is respectively disposed opposite to the outer periphery of the conical part;

[0019] When the bottle is in the second position, the cap is located between the first capping wheel, the second capping wheel and the third capping wheel, and the outer periphery of the cap is respectively in contact with and limited by the cylindrical part.

[0020] The present invention is further configured such that a fixing member is fixedly installed on the upper end of the bracket, and a sliding rod one and a sliding rod two are respectively fixedly installed horizontally inside the fixing member. The sliding rod one and the sliding rod two are respectively arranged in two sets at intervals in the vertical direction, and the two sets of sliding rod one and sliding rod two are respectively arranged towards the first capping wheel and the second capping wheel.

[0021] The present invention is further configured such that a connecting shaft one and a connecting shaft two are rotatably mounted on the upper ends of the first capping wheel and the second capping wheel, respectively, and the connecting shaft one and the connecting shaft two are slidably connected to the slide rod one and the slide rod two, respectively;

[0022] Spring 1 and Spring 2 are respectively sleeved on the outer periphery of slide rod 1 and slide rod 2. Spring 1 elastically abuts between slide rod 1 and the fixing member, and Spring 2 elastically abuts between slide rod 2 and the fixing member.

[0023] The present invention is further configured such that the bottle cap conveying device includes a hopper and a conveying guide rail, one end of which is connected to the hopper and the other end is set toward the bottle mouth of the packaging bottle on the turntable, so that the caps can be fastened to the upper end of the bottle one by one.

[0024] A method for pre-tightening the cap of a pharmaceutical packaging bottle, wherein the pre-tightening device for the cap of a pharmaceutical packaging bottle as described above is used for pre-tightening.

[0025] In summary, the present invention has the following beneficial effects: after pre-tightening by the device, the cap body is in a regular posture and the threads are aligned. The final tightening station no longer needs to spend time repeatedly adjusting the position of the cap, which significantly shortens the processing cycle of a single bottle and effectively improves the operating efficiency and capacity of the entire pharmaceutical packaging production line.

[0026] This device utilizes the tapered part at the bottom of the capping wheel to guide and center the bottle cap, effectively correcting the problem of the bottle cap being skewed or offset after being capped, avoiding faults such as stripping or uneven tightening during the capping process, ensuring smooth thread engagement, and significantly improving the pass rate of pre-tightening the bottle cap.

[0027] The device employs a three-point circumferential clamping structure formed by the first, second, and third capping wheels. The first and second capping wheels are equipped with a spring-loaded elastic floating structure, which not only provides stable positioning of the bottle cap and prevents it from rotating or shaking during capping, but also adapts to different sizes of pharmaceutical bottle caps, improving the device's versatility.

[0028] The telescopic rod drives the bottle to switch between two working positions, high and low, and separates the bottle cap alignment and pre-tightening into two independent processes. The cylindrical part of the capping wheel completes the torque transmission. The number of pre-tightening turns and the force are uniform and controllable, effectively preventing the problem of excessively loose or tight screwing. This ensures that the pre-tightening effect of each packaged bottle is uniform and meets the pharmaceutical packaging process specifications. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a pre-tightening device for a pharmaceutical packaging bottle cap according to this embodiment;

[0030] Figure 2 for Figure 1 Enlarged view at point A;

[0031] Figure 3This is a partial sectional view of a pre-tightening device for a pharmaceutical packaging bottle cap according to this embodiment;

[0032] Figure 4 This is a partial structural schematic diagram of a pre-tightening device for a pharmaceutical packaging bottle cap according to this embodiment;

[0033] Figure 5 for Figure 4 A cross-sectional view of the inner packaging bottle in its first position;

[0034] Figure 6 for Figure 4 Cross-sectional view of the second position of the middle packaging bottle;

[0035] Figure 7 for Figure 4 A sectional view in the horizontal direction.

[0036] Reference numerals: Frame 1; Limiting component 11; Support component 12; Telescopic rod 13; Support block 14; Turntable 2; Upper disc 21; Limiting groove one 211; Lower disc 22; Limiting groove two 221; Pre-tightening assembly 3; Bracket 31; First capping wheel 32; Connecting shaft one 321; Slide rod one 322; Spring one 323; Second capping wheel 33; Connecting shaft two 331; Slide rod two 332; Spring two 333; Third capping wheel 34; Connecting shaft three 341; Conical part 35; Cylindrical part 36; First motor 37; Fixing component 38; Bottle cap conveying device 4; Hopper 41; Conveying guide rail 42; Packaging bottle 5; Bottle body 51; Cap body 52. Detailed Implementation

[0037] 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.

[0038] like Figures 1 to 7As shown, this embodiment discloses a pre-tightening device for pharmaceutical packaging bottle caps, mainly including a frame 1, a turntable 2, a pre-tightening assembly 3, and a cap conveying device 4. The pre-tightening assembly 3 and the cap conveying device 4 are respectively fixedly installed on the frame 1. The turntable 2 is rotatably installed on the upper end of the frame 1 and is driven to rotate by a motor. The turntable 2 can drive several packaging bottles 5 to rotate intermittently and pass through the cap conveying device 4 and the pre-tightening assembly 3 in sequence. The packaging bottle 5 includes a bottle body 51 and a cap body 52, and the cap body 52 is threadedly connected to the upper end of the bottle body 51. The pre-tightening assembly 3 mainly includes a first capping wheel 32, a second capping wheel 33, and a third capping wheel 34. The first capping wheel 32, the second capping wheel 33, and the third capping wheel 34 respectively abut against the outer periphery of the cap body 52, and the third capping wheel 34 is driven to rotate by a first motor 37 to pre-tighten the cap body 52.

[0039] Reference Figure 1 and Figure 2 As shown, frame 1 serves as the foundation for the entire machine, and is constructed from welded steel sections, featuring a stable structure and strong load-bearing capacity. Three types of auxiliary components—limiting components 11, supporting components 12, and telescopic rods 13—are fixedly installed on frame 1.

[0040] The limiting component 11 is a ring structure and is fixed on the side of the turntable 2. The inner wall of the ring is smooth and is used to circumferentially limit the bottle 51 from the side to prevent the bottle from tilting or shifting.

[0041] The support component 12 is also a ring structure, fixedly installed at the bottom of the turntable 2, corresponding vertically to the limiting component 11, mainly supporting the bottom of the bottle body 51 and bearing the overall weight of the packaging bottle.

[0042] The telescopic rod 13 is vertically fixed below the pre-tightening station of the frame 1. A support block 14 is fixedly connected to the top of the telescopic rod 13. The top surface of the support block 14 is in contact with the bottom of the bottle 51. The telescopic rod 13 can perform vertical telescopic movements, driving the bottle 51 to rise and fall in the vertical direction, so that the bottle 51 can switch between the first position and the second position to perform the pre-tightening operation of the cap 52.

[0043] Reference Figure 4 As shown, the turntable 2 is the conveying carrier of the packaging bottle 5. It is mounted on the frame 1 and rotates as a whole. It is driven by an independent motor to achieve intermittent rotation, ensuring that the packaging bottle 5 stops one by one at the bottle cap conveying station, the pre-tightening station and other corresponding processes to complete the corresponding processes.

[0044] Turntable 2 consists of an upper disc 21 and a lower disc 22. The two discs are arranged at intervals along the vertical direction and connected by a central rotating shaft to achieve synchronous rotation. Several limiting grooves 211 are formed in a circular array on the outer periphery of the upper disc 21, and the same number of limiting grooves 221 are formed at corresponding positions on the outer periphery of the lower disc 22. The limiting grooves 211 and 221 are vertically aligned and together form the positioning slots of the packaging bottle 5.

[0045] Each packaging bottle 5 includes a bottle body 51 and a cap 52. The upper part of the bottle body 51 is embedded in a limiting groove 211 and the lower part is embedded in a limiting groove 221 to complete radial positioning. At the same time, the side wall of the bottle body 51 is attached to the inner circumference of the annular limiting member 11 and the bottom rests on the upper end of the support member 12. Multiple limiting ensures that the packaging bottle 5 moves smoothly and intermittently with the turntable 2 and passes through the cap conveying device 4 and the pre-tightening assembly 3 in sequence.

[0046] Reference Figure 1 As shown, the bottle cap conveying device 4 can orderly convey the scattered caps 52 and attach them to the bottle mouth of the bottle body 51, and then pre-tighten the caps 52 through the pre-tightening component 3.

[0047] The bottle cap conveying device 4 consists of a hopper 41 and a conveying guide rail 42. The hopper 41 is a storage bin for storing the caps 52 to be installed. One end of the conveying guide rail 42 is connected to the outlet of the hopper 41, and the other end extends to the top of the turntable 2, directly opposite the bottle mouth of the bottle 51. During operation, the caps 52 in the hopper 41 slide orderly through the conveying guide rail 42 and are snapped onto the upper bottle mouth of the bottle 51 that has moved to the station, completing the initial placement of the caps 52. Then, the packaged bottle 5 flows with the turntable to the next pre-tightening station.

[0048] Reference Figure 5 and Figure 6 As shown, the pre-tightening assembly 3 is fixed on the frame 1 and located at the downstream station of the cover 52 conveying device. It is the core structure for realizing the pre-tightening of the cover 52. The whole assembly is composed of the bracket 31 and three sets of capping wheels.

[0049] The bracket 31 is a vertical support frame, which is fixedly installed on the upper end of the limiting member 11. The three sets of capping wheels are the first capping wheel 32, the second capping wheel 33, and the third capping wheel 34. The first capping wheel 32, the second capping wheel 33, and the third capping wheel 34 are all mounted on the bracket 31 in a vertical direction. The three sets of capping wheels are distributed in a three-point ring around the outer periphery of the cap 52, forming a clamping space and abutting against the outer wall of the cap 52 from three directions to achieve circumferential clamping and positioning.

[0050] The first capping roller 32, the second capping roller 33, and the third capping roller 34 have the same structure, all being integrally molded. They are divided into two functional sections: an upper cylindrical section 36 and a lower conical section 35, which are adapted to the two working positions of the bottle body 51. The conical section 35 has a conical surface structure that is wider at the top and narrower at the bottom, and is mainly used for the initial alignment and guidance of the cap body 52. ​​The cylindrical section 36 has a cylindrical surface of equal diameter, which is used to tightly fit the outer wall of the cap body and transmit rotational torque to complete the tightening.

[0051] Reference Figure 7 As shown, both the first capping wheel 32 and the second capping wheel 33 adopt an elastic floating abutment structure, which can ensure that bottle caps of different sizes can be stably clamped. A fixing member 38 is fixedly installed at the top of the bracket 31. Inside the fixing member 38, two sets of sliding rods 322 and two sets of sliding rods 332 are arranged horizontally. The sliding rods are all arranged horizontally and face the first capping wheel 32 and the second capping wheel 33 respectively.

[0052] The upper end of the first capping wheel 32 is rotatably connected to a connecting shaft 321, which is slidably sleeved on a sliding rod 322; the upper end of the second capping wheel 33 is rotatably connected to a connecting shaft 331, which is slidably sleeved on a sliding rod 332; both sets of capping wheels can slide slightly radially along the sliding rod to adapt to different sizes of caps 52 and improve the versatility of the device.

[0053] Spring 323 is sleeved on the outside of slide bar 322, and spring 333 is sleeved on the outside of slide bar 332. The two ends of the springs abut against the connecting shaft of the fixing member 38 and the corresponding capping wheel, respectively. Relying on the spring force, the first capping wheel 32 and the second capping wheel 33 are always elastically pressed against the outer wall of the cap 52, which has self-adaptive compensation capability, avoids pinching the cap 52, and ensures clamping stability.

[0054] The third capping wheel 34 is the driving wheel, providing the power for capping. The upper end of the third capping wheel 34 is fixedly connected to the connecting shaft 341, which is connected to the output end of the first motor 37. After the first motor 37 starts, it drives the third capping wheel 34 to rotate continuously. Relying on the friction between the wheel and the cap 52, it drives the cap 52 to rotate as a whole, and achieves pre-tightening with the thread.

[0055] Reference Figure 5 and Figure 6 As shown, relying on the telescopic rod 13 under the frame 1, the bottle 51 can be driven to rise and fall vertically, corresponding to two working positions, to complete the alignment guidance and tightening operations respectively.

[0056] The telescopic rod 13 retracts, and the support block 14 lowers the bottle body 51 to a lower position. At this time, the cap body 52 corresponds to the conical portion 35 area of ​​the first capping wheel 32, the second capping wheel 33, and the third capping wheel 34, respectively. The inclined surface of the conical portion 35 plays a guiding role, centering and correcting the cap body 52 fastened to the bottle mouth, correcting the cap tilt problem, and completing the pre-alignment; secondly, the conical portion 35 also has a clearance function, making it easy for the packaging bottle 5 with the cap body 52 installed to smoothly enter the conical portion 35 area of ​​the three sets of capping wheels.

[0057] The telescopic rod 13 extends upward, and the support block 14 lifts the bottle body 51 to a high position. At this time, the cap body 52 rises to the cylindrical part 36 area of ​​the first capping wheel 32, the second capping wheel 33, and the third capping wheel 34, and the outer wall of the cap body 52 fits tightly with the cylindrical part 36; the first motor 37 drives the third capping wheel 34 to rotate, and in the state of three-point elastic clamping, drives the cap body 52 to rotate, so that the cap body 52 and the upper thread of the bottle body 51 are gradually screwed together, completing the pre-tightening process.

[0058] This embodiment also discloses a method for pre-tightening the cap of a pharmaceutical packaging bottle, which is implemented using the aforementioned pre-tightening device. The overall process is an intermittent assembly line operation, and the specific steps are as follows:

[0059] Turn on the power supply of the whole machine and debug the operating parameters of the turntable 2 drive motor, the first motor 37, the telescopic rod 13, and the bottle cap conveying device 4 respectively; confirm that the turntable 2 is in intermittent rotation mode, the capping wheel rotates smoothly, the lifting stroke of the telescopic rod 13 is normal, the bottle cap conveying guide rail 42 discharges material stably, and the equipment enters the standby state.

[0060] The filled pharmaceutical packaging bottles 5 are continuously conveyed and sequentially transported to the limiting groove 211 and limiting groove 221 of the turntable 2. The bottle body 51 is positioned by the limiting component 11 and the supporting component 12. The motor of the turntable 2 is started, which drives the turntable 2 to rotate intermittently, conveying the packaging bottles 5 one by one to the cap conveying station.

[0061] When the packaging bottle 5 moves to the corresponding station of the cap conveying device 4, the turntable 2 stops rotating; the caps 52 in the hopper 41 slide down along the conveying guide rail 42 and are attached one by one to the upper end of the bottle mouth of the bottle body 51, completing the initial placement of the caps 52.

[0062] Turntable 2 starts again, transporting the packaging bottle 5 with cap 52 to the pre-tightening assembly 3 station and pausing; at this time, telescopic rod 13 is in the retracted state, bottle 51 is in the first position, cap 52 is opposite to the conical part 35 of the three sets of capping wheels, and the conical structure guides and corrects the position of the tilted cap 52.

[0063] The telescopic rod 13 extends upward and lifts the bottle 51 to the second position through the support block 14, so that the cap 52 enters between the cylindrical parts 36 of the three sets of capping wheels; the first capping wheel 32 and the second capping wheel 33 elastically press the cap 52 under the action of the spring, forming a three-point stable clamping.

[0064] The first motor 37 starts and drives the third capping wheel 34 to rotate. Relying on friction, the cap body 52 rotates synchronously. The cap body 52 gradually engages with the external thread of the bottle mouth of the bottle body 51 through the internal thread, thus completing the pre-tightening of the bottle cap.

[0065] After the pre-tightening reaches the set torque or number of turns, the first motor 37 stops operating. The telescopic rod 13 retracts, and the bottle body 51 falls back to the first position, releasing the pressure of the capping wheel on the cap body 52; the turntable 2 continues to rotate intermittently, transporting the pre-tightened packaging bottles to the next process, while simultaneously sending the next set of packaging bottles 5 to be processed into the pre-tightening station, repeating this process to achieve continuous batch production.

[0066] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A pre-tightening device for the cap of a pharmaceutical packaging bottle, characterized in that, It includes a frame (1), a turntable (2), a pre-tightening assembly (3) and a bottle cap conveying device (4), wherein the pre-tightening assembly (3) and the bottle cap conveying device (4) are respectively fixedly installed on the frame (1); The turntable (2) is rotatably mounted on the frame (1) and driven to rotate by a motor. The turntable (2) can drive several packaging bottles (5) to rotate intermittently and pass through the bottle cap conveying device (4) and the pre-tightening assembly (3) in sequence. The packaging bottle (5) includes a bottle body (51) and a cap (52), wherein the cap (52) is threadedly connected to the upper end of the bottle body (51); The pre-tightening assembly (3) includes a first capping wheel (32), a second capping wheel (33) and a third capping wheel (34). The first capping wheel (32), the second capping wheel (33) and the third capping wheel (34) respectively abut against the outer periphery of the cap body (52), and the third capping wheel (34) is driven to rotate by the first motor (37) to pre-tighten the cap body (52).

2. The pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 1, characterized in that, The turntable (2) includes an upper disc (21) and a lower disc (22), which are spaced apart in the vertical direction and rotate synchronously. The upper disc (21) has several limiting grooves (211), and the lower disc (22) has several limiting grooves (221). The limiting grooves (211) and the limiting grooves (221) are arranged in a circular array and are set in a vertical direction.

3. The pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 2, characterized in that, The frame (1) is fixedly installed with a limiting component (11) and a support component (12). The limiting component (11) and the support component (12) are both ring-shaped and are respectively spaced at the side and bottom of the turntable (2). The bottle body (51) is respectively embedded in the first limiting groove (211) and the second limiting groove (221) and abuts against the inner circumference of the limiting member (11). The bottom of the bottle body (51) abuts against the upper end of the support member (12).

4. The pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 1, characterized in that, The pre-tightening assembly (3) also includes a bracket (31). The first capping wheel (32), the second capping wheel (33) and the third capping wheel (34) are respectively mounted on the bracket (31) in a vertical direction. The first capping wheel (32), the second capping wheel (33) and the third capping wheel (34) are distributed in a three-point manner along the outer periphery of the cover (52) to form a circumferential clamping of the cover (52). The first capping wheel (32) and the second capping wheel (33) respectively elastically abut against the outer periphery of the cover (52).

5. A pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 4, characterized in that, The frame (1) is fixedly equipped with a telescopic rod (13), and a support block (14) is fixedly connected to the upper end of the telescopic rod (13). The support block (14) abuts against the bottom of the bottle (51). The telescopic rod (13) can drive the bottle (51) to move in the vertical direction, so that the bottle (51) has a first position and a second position relative to the turntable (2).

6. A pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 5, characterized in that, The first capping wheel (32), the second capping wheel (33) and the third capping wheel (34) are respectively provided with a conical part (35) and a cylindrical part (36), and the conical part (35) and the cylindrical part (36) are integrally connected; When the bottle body (51) is in the first position, the cap body (52) is located between the first capping wheel (32), the second capping wheel (33) and the third capping wheel (34), and the outer periphery of the cap body (52) is respectively arranged opposite to the outer periphery of the conical part (35); When the bottle body (51) is in the second position, the cap body (52) is located between the first capping wheel (32), the second capping wheel (33) and the third capping wheel (34), and the outer periphery of the cap body (52) abuts against and limits the cylindrical part (36).

7. A pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 4, characterized in that, The bracket (31) is fixedly installed with a fixing member (38) at the upper end. The fixing member (38) is horizontally fixedly installed with a sliding rod one (322) and a sliding rod two (332). The sliding rod one (322) and the sliding rod two (332) are arranged in two sets at intervals in the vertical direction. The two sets of sliding rod one (322) and sliding rod two (332) are respectively arranged towards the first capping wheel (32) and the second capping wheel (33).

8. A pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 7, characterized in that, The first capping wheel (32) and the second capping wheel (33) are respectively rotatably mounted with a connecting shaft one (321) and a connecting shaft two (331), and the connecting shaft one (321) and the connecting shaft two (331) are respectively slidably connected to the sliding rod one (322) and the sliding rod two (332). Spring 1 (323) and Spring 2 (333) are respectively sleeved on the outer periphery of the slide rod 1 (322) and the slide rod 2 (332). Spring 1 (323) elastically abuts between slide rod 1 (322) and the fixing member (38), and Spring 2 (333) elastically abuts between slide rod 2 (332) and the fixing member (38).

9. A pre-tightening device for the cap of a pharmaceutical packaging bottle according to claim 1, characterized in that, The bottle cap conveying device (4) includes a hopper (41) and a conveying guide rail (42). One end of the conveying guide rail (42) is connected to the hopper (41), and the other end is set towards the bottle mouth of the packaging bottle (5) on the turntable (2), which can fasten the cap (52) one by one to the upper end of the bottle body (51).

10. A method for pre-tightening the cap of a pharmaceutical packaging bottle, characterized in that, Pre-tightening is performed using the pre-tightening device for the cap of the pharmaceutical packaging bottle as described in claims 1 to 9.

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