Medical injection practice pen automatic assembly line

Abstract

The present application relates to the technical field of medical practice tool assembly, and particularly relates to an automatic assembly line for medical injection practice pens, which comprises a circulating conveying mechanism, a positioning mechanism, a shell loading mechanism, a needle cylinder assembly mechanism, an inner piston assembly mechanism, a cam sleeve assembly mechanism, an inner spring assembly mechanism and a tail cover assembly mechanism, conveying jigs are transmitted on the circulating conveying mechanism, and the positioning mechanism is used for positioning the conveying jigs on the circulating conveying mechanism; the circulating conveying mechanism is used for driving the conveying jigs to pass through the shell loading mechanism, the needle cylinder assembly mechanism, the inner piston assembly mechanism, the cam sleeve assembly mechanism, the inner spring assembly mechanism and the tail cover assembly mechanism in sequence; and the shell loading mechanism is used for placing a shell and a piston sleeve on the conveying jig; the present application solves the problems of low efficiency and high difficulty of artificial assembly, greatly increases the production capacity, reduces the production cost, and is suitable for mass production.

Description

Technical Field

[0001] The present invention relates to the technical field of medical practice tool assembly, in particular to an automatic assembly line for medical injection practice pens. Background Art

[0002] The insulin practice pen is a medical device designed specifically for diabetic patients. It simulates the actual insulin injection process, helping them become familiar with and master the technique. The pen's internal structure is meticulously designed to simulate the actual operation of an insulin pen. Insulin practice pens typically do not contain actual insulin solution, but instead use simulated liquid to ensure patient safety without contact with the drug during practice. Through repeated practice, patients can master key steps such as pre-injection preparation, injection site selection, injection angle control, injection depth control, and post-injection handling.

[0003] Injection practice pens are assembled from multiple components. Existing production processes for injection practice pens involve manual or semi-automatic assembly. This assembly method is inefficient, difficult, and costly. Therefore, automated design is needed for the production of existing injection practice pens. Summary of the Invention

[0004] To solve the above problems, the present invention solves the low efficiency and high difficulty of existing manual assembly, greatly increases production capacity, reduces production costs, and is suitable for mass production of medical injection practice pen automatic assembly lines.

[0005] The technical solution adopted by the present invention is: an automatic assembly line for medical injection practice pens, including a circulating conveying mechanism, a positioning mechanism, an outer shell loading mechanism, a syringe assembly mechanism, an inner piston assembly mechanism, a cam sleeve assembly mechanism, an inner spring assembly mechanism and a tail cover assembly mechanism. The circulating conveying mechanism is equipped with a conveying jig, and the positioning mechanism is used to position the conveying jig on the circulating conveying mechanism. The circulating conveying mechanism is used to drive the conveying jig to pass through the outer shell feeding mechanism, the syringe assembly mechanism, the inner piston assembly mechanism, the cam sleeve assembly mechanism, the inner spring assembly mechanism and the tail cover assembly mechanism in sequence; the outer shell feeding mechanism is used to place the outer shell and the piston sleeve on the conveying jig; the syringe assembly mechanism is used to assemble the syringe and install it on the piston sleeve, the inner piston assembly mechanism is used to assemble the inner piston and install it on the syringe, the cam sleeve assembly mechanism is used to assemble the cam kit and install it on the inner piston, and the inner spring assembly mechanism is used to install the inner spring on the inner piston; a combination mechanism is provided on one side of the inner spring assembly mechanism, the combination mechanism is used to grab the completely assembled syringe and install it on the outer shell, and the tail cover assembly mechanism installs the tail cover on the outer shell.

[0006] A further improvement to the above scheme is that the circulating conveying mechanism includes an upper conveying assembly, a lower conveying assembly, a first lifting assembly and a second lifting assembly. A connecting frame is provided between the upper conveying assembly and the lower conveying assembly. The first lifting assembly and the second lifting assembly are respectively arranged at the two ends of the lower conveying assembly and the upper conveying assembly to form a closed-loop conveying channel, and the closed-loop conveying channel is used for conveying jigs.

[0007] A further improvement to the above scheme is that the upper conveying components are provided with multiple groups, and two adjacent groups of upper conveying components are connected end to end; the lower conveying components are provided with multiple groups, and two adjacent groups of lower conveying components are connected end to end; the upper conveying components and the lower conveying components are opposite to each other up and down.

[0008] A further improvement to the above scheme is that the upper conveying assembly includes an upper conveying frame, an upper conveying roller, an upper conveying belt, an upper conveying motor and an upper conveying baffle, the upper conveying rollers are arranged at both ends of the upper conveying frame, the upper conveying belt is connected to the upper conveying rollers, the upper conveying motor is arranged on the connecting frame and is driven by the upper conveying rollers; the upper conveying baffles are arranged on both sides of the upper conveying frame, and an upper conveying trough is formed on the upper side of the upper conveying belt, and the upper conveying belt is used to drive the conveying jig to be transported along the upper conveying trough.

[0009] A further improvement to the above scheme is that the lower-level conveying assembly includes a lower-level conveying frame, a lower-level conveying roller, a lower-level conveying belt, a lower-level conveying motor and a lower-level conveying baffle, the lower-level conveying rollers are arranged at both ends of the lower-level conveying frame, the lower-level conveying belt is connected to the lower-level conveying rollers, the lower-level conveying motor is arranged on the connecting frame and is driven and connected to the lower-level conveying rollers; the lower-level conveying baffles are arranged on both sides of the lower-level conveying frame, and a lower conveying trough is formed on the upper side of the lower conveying belt, and the lower conveying belt is used to drive the conveying jig to be transported along the lower conveying trough.

[0010] A further improvement to the above scheme is that the conveying jig includes a jig base plate and a fixed placement seat, the fixed placement seat is provided with a first placement groove for placing the piston sleeve and a second placement groove for placing the outer shell; the positioning mechanism includes a conveying positioning module and a position positioning module, the conveying positioning module includes a first fixed frame, a conveying positioning cylinder and a conveying positioning pressure block arranged on the upper conveying component, the conveying positioning cylinder is arranged on the first fixed frame, the conveying positioning pressure block is arranged at the driving end of the conveying positioning cylinder, and the conveying positioning pressure block is provided with a positioning surface facing the conveying direction of the conveying jig, and the positioning surface is used to position the jig base plate on the upper conveying component.

[0011] A further improvement to the above scheme is that the position positioning module is located on one side of the conveying positioning module, the positioning surface is provided with a positioning pressure plate, the position positioning module includes a lifting cylinder and a lifting positioning block, and the lifting positioning block is opposite to the positioning pressure plate to clamp and position the fixture base plate.

[0012] A further improvement to the above scheme is that the lifting positioning block is provided with a position positioning block, and the jig base plate is provided with a positioning groove. The position positioning block is used to cooperate with the positioning groove to position the jig base plate and form a double-sided positioning structure in combination with the positioning surface; the upper side of the position positioning block is provided with a positioning inclined surface.

[0013] A further improvement to the above solution is that positioning pins are provided on both sides of the jacking positioning block, and positioning pin holes are provided on both sides of the fixture base plate, and the positioning pin holes cooperate with the positioning pins to position the fixture base plate.

[0014] A further improvement to the above scheme is that the syringe assembly mechanism includes a syringe loading device, a first spring loading device, a second spring loading device, a syringe turntable device and a syringe picking mechanism, the syringe turntable device is provided with a syringe assembly jig, the syringe loading device is used to load the syringe onto the syringe assembly jig, the syringe turntable device is used to drive the syringe assembly jig through the first spring loading device and the second spring loading device in sequence, the first spring loading device is used to install the first spring on the outer diameter of the syringe, and the second spring loading device is used to install the second spring on the inner diameter of the syringe; the syringe picking mechanism is used to grab the assembled syringe and install it on the piston cylinder.

[0015] A further improvement to the above scheme is that the syringe loading device includes a syringe feeding tray, a syringe feeding track and a syringe picking assembly, the syringe feeding track is connected to the syringe feeding tray, and the syringe picking assembly is used to grab the syringe on the syringe feeding track and place it on the syringe assembly jig; the syringe picking assembly is provided with a syringe picking rotating module and a syringe clamping module, the syringe picking rotating module is used to drive the syringe clamping module to rotate to adjust the angle of the syringe picking, and the syringe clamping module is used to clamp the syringe for loading.

[0016] A further improvement to the above scheme is that the first spring loading device includes a first spring feeding tray, a first spring feeding track and a first spring picking assembly, the first spring feeding track is connected to the first spring feeding tray, and the first spring picking assembly is used to grab the first spring on the first spring feeding track and assemble it to the outer diameter of the syringe.

[0017] A further improvement to the above scheme is that the second spring loading device includes a second spring feeding tray, a second spring feeding track and a second spring picking assembly, the second spring feeding track is connected to the second spring feeding tray, and the second spring picking assembly is used to grab the second spring on the second spring feeding track and assemble it to the inner diameter of the syringe.

[0018] A further improvement to the above scheme is that the syringe feeding mechanism includes a gantry, an assembly transfer transmission module and a transfer grasping device, the assembly transfer transmission module is arranged on the gantry, the transfer grasping device is arranged on the assembly transfer transmission module, the transfer grasping device includes a transverse bracket and two groups of assembly robots arranged on the transverse bracket, a directional sleeve is provided on one side of the syringe turntable device, the directional sleeve is used for positioning the direction of the syringe, the assembly transfer transmission module is used to drive two groups of assembly robots to alternate between the syringe assembly jig, the directional sleeve and the conveying jig; the assembly robot is provided with a direction adjustment motor and a grasping claw, the direction adjustment motor is used to adjust the pay-off of the grasped syringe, and the grasping claw is used to grasp the syringe; a CCD camera is provided on the gantry to photograph the assembly condition and direction of the syringe.

[0019] A further improvement to the above scheme is that the inner piston assembly mechanism includes a transparent sleeve feeding mechanism, a piston rod feeding mechanism, a cam rod feeding mechanism, an inner piston turntable mechanism, a pressing mechanism and an inner piston assembly mechanism; the inner piston turntable mechanism is used to drive the piston assembly jig to pass through the transparent sleeve feeding mechanism, the piston rod feeding mechanism, the cam rod feeding mechanism, the pressing mechanism and the inner piston assembly mechanism in sequence, the transparent sleeve feeding mechanism is used to automatically feed the transparent sleeve to the piston assembly jig, and the piston rod feeding mechanism is used to feed the piston rod to the transparent The cam rod feeding mechanism is used to assemble the cam rod onto the transparent sleeve, the pressing mechanism is used to press and assemble the cam rod onto the transparent sleeve, and limit the piston rod; the inner piston assembly mechanism is used to grab the assembled cam rod and assemble it onto the piston sleeve together with the transparent sleeve; the cam sleeve assembly mechanism is used to grab and orient the cam sleeve and then assemble it onto the piston rod, the cam sleeve assembly mechanism is used to grab and assemble the cam sleeve ring onto the cam rod; the inner spring assembly mechanism is used to install the inner spring into the inner diameter of the cam rod.

[0020] A further improvement to the above scheme is that the transparent sleeve loading mechanism includes a transparent sleeve feeding tray, a transparent sleeve feeding track and a transparent sleeve picking assembly, one end of the transparent sleeve feeding track is connected to the transparent sleeve feeding tray, and the transparent sleeve picking assembly is used to grab the transparent sleeve on the transparent sleeve feeding track and place it on the piston assembly jig.

[0021] A further improvement to the above scheme is that the piston rod feeding mechanism includes an end cover feeding tray, an end cover feeding track, an end cover picking assembly, a piston rod feeding tray, a piston rod feeding track, a piston rod picking assembly and a piston rod assembly assembly, the end cover feeding tray is used to transport the end cover toward the end cover feeding track, the end cover picking assembly is used to pick up the end cover and put it onto the piston rod assembly assembly, the piston rod feeding tray is used to feed the piston rod toward the piston rod feeding track, the piston rod picking assembly is used to grab the piston rod on the piston rod feeding track and assemble it with the end cover, and then place it on the transparent sleeve on the piston assembly jig for assembly.

[0022] A further improvement to the above scheme is that the cam rod loading mechanism includes a cam rod feeding tray, a cam rod feeding track and a cam rod picking assembly, one end of the cam rod feeding track is connected to the cam rod feeding tray, and the cam rod picking assembly is used to grab the cam rod on the cam rod feeding track and place it on the transparent sleeve.

[0023] A further improvement to the above scheme is that the clamping mechanism includes a clamping drive cylinder and a clamping block, which are used to clamp the cam rod onto the transparent sleeve; the inner piston assembly mechanism includes a material picking transmission module and a material picking assembly clamp, and the material picking assembly clamp is used to grab the assembled transparent sleeve and place it on the piston sleeve.

[0024] A further improvement to the above solution is that a pressing assembly with the same structure as the pressing mechanism is provided on one side of the circulating conveying mechanism, and the pressing assembly is used to press the transparent sleeve into the piston sleeve.

[0025] A further improvement to the above scheme is that the cam sleeve assembly mechanism includes a cam sleeve feed tray, a cam sleeve feed track, a cam sleeve picking assembly and a cam orienting mechanism, one end of the cam sleeve feed track is connected to the cam sleeve feed tray, and the cam sleeve picking assembly is provided with a plurality of cam sleeve picking claws, and the plurality of cam sleeve picking claws are alternately transmitted to the cam sleeve feed track, the cam orienting mechanism and the conveying jig to assemble the cam sleeve on the cam rod.

[0026] A further improvement to the above scheme is that the inner spring assembly mechanism includes an inner spring feed tray, an inner spring feed track and an inner spring picking assembly, one end of the inner spring feed track is connected to the inner spring feed tray, and the inner spring picking assembly is used to grab the inner spring on the inner spring feed track and place it on the inner diameter of the cam rod.

[0027] A further improvement to the above scheme is that the tail cover assembly mechanism includes a tail cover feed tray, a tail cover feed track and a tail cover picking assembly, one end of the tail cover feed track is connected to the tail cover feed tray, and the tail cover picking assembly is used to grab the tail cover on the tail cover feed track and assemble it to one end of the outer shell.

[0028] The beneficial effects of the present invention are:

[0029] Compared to existing medical injection practice pen assembly systems, this invention utilizes fully automated assembly. A circulating conveyor mechanism drives the conveying jig, which is then positioned during transport by a positioning mechanism, allowing each component to be automatically assembled. This solves the low efficiency and high difficulty of existing manual assembly methods, significantly increasing production capacity and reducing production costs, making it suitable for mass production.

[0030] By integrating a circulating conveying mechanism with multiple precision positioning and assembly mechanisms, this invention fully automates the entire process of a medical injection practice pen, from shell loading to tail cap assembly. This continuous, uninterrupted production process significantly shortens production cycles, reduces manual intervention and waiting time, and thus significantly improves production efficiency and overall capacity. With the same manpower allocation, it can produce more high-quality products, meeting the growing market demand for medical teaching and practice tools. The automated assembly line utilizes high-precision positioning mechanisms and specialized assembly equipment to ensure precise execution of every assembly step. From the precise alignment of the shell and piston sleeve to the layer-by-layer assembly of the syringe, inner piston, cam sleeve, and inner spring, all steps are completed under strict process control, effectively avoiding errors and defective products that may be introduced by manual assembly. This highly consistent production method not only improves overall product quality but also enhances user experience and trust. The introduction of the automated assembly line significantly reduces labor requirements and labor costs on the production line. Furthermore, by eliminating manual operations, errors and scrap caused by human factors are reduced, further saving raw materials and production costs. In addition, the stable operation and efficient output of automated equipment also provide enterprises with more flexible production scheduling space, helping enterprises to quickly adjust production plans according to market demand and improve market response speed.

[0031] Traditional medical device assembly often involves complex manual operations and potential mechanical injury risks. The use of automated assembly lines, however, frees workers from heavy manual labor and high-risk working environments, improving working conditions and reducing the risk of occupational injury. Furthermore, the equipment's internal safety mechanisms and emergency shutdown function provide strong safeguards for production safety. With its efficient, precise, safe, and intelligent technical features, this invention has brought significant technical and economic benefits to medical device production. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a three-dimensional schematic diagram of the automatic assembly line for the medical injection practice pen of the present invention;

[0033] Figure 2 for Figure 1Another perspective view of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0034] Figure 3 For Figure 1 The top view of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0035] Figure 4 For Figure 1 The top view of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0036] Figure 5 For Figure 1 The schematic diagram of the positioning mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0037] Figure 6 For Figure 1 The schematic diagram of the positioning mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0038] Figure 7 For Figure 1 The schematic diagram of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0039] Figure 8 For Figure 1 The schematic diagram of the needle cylinder assembly mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0040] Figure 9 For Figure 1 The schematic diagram of the needle cylinder assembly mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0041] Figure 10 For Figure 1 The schematic diagram of the inner piston assembly mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0042] Figure 11 For Figure 1 The schematic diagram of the inner piston assembly mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0043] Figure 12 For Figure 1 The top view of the inner piston assembly mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0044] Figure 13 For Figure 11 The schematic diagram of the cam rod feeding mechanism of the inner piston assembly mechanism;

[0045] Figure 14 For Figure 1 The schematic diagram of the cam sleeve assembly mechanism of the automatic assembly line of the traditional Chinese medicine injection practice pen;

[0046] Figure 15 for Figure 2 A is an enlarged schematic diagram;

[0047] Figure 16 This is a schematic diagram of the explosion of the medical injection practice pen of the present invention.

[0048] Description of the accompanying drawings: Circular conveying mechanism 1, upper conveying assembly 11, upper conveying frame 111, upper conveying roller 112, upper conveying belt 113, upper conveying motor 114, upper conveying baffle 115, lower conveying assembly 12, lower conveying frame 121, lower conveying roller 122, lower conveying belt 123, lower conveying motor 124, lower conveying baffle 125, first lifting assembly 13, second lifting assembly 14, connecting frame 15;

[0049] Positioning mechanism 2, conveying positioning module 21, first fixing frame 211, conveying positioning cylinder 212, conveying positioning pressure block 213, positioning surface 214, positioning pressure plate 215, position positioning module 22, lifting cylinder 221, lifting positioning block 222, position positioning block 223, positioning pin 224, shell feeding mechanism 3;

[0050] Syringe assembly mechanism 4, syringe loading device 41, syringe feeding tray 411, syringe feeding track 412, syringe picking assembly 413, syringe picking rotating module 4131, syringe clamping module 4132, first spring loading device 42, first spring feeding tray 421, first spring feeding track 422, first spring picking assembly 423, second spring loading device 43, second spring feeding tray 431, second spring feeding track 432, second spring picking assembly 433, syringe turntable device 44, syringe assembly fixture 441, directional shaft sleeve 442, syringe picking mechanism 45, gantry 451, CCD camera 4511, assembly transfer transmission module 452, transfer grabbing device 453, transverse bracket 4531, assembly robot 4532;

[0051] Inner piston assembly mechanism 5, transparent sleeve feeding mechanism 51, transparent sleeve feeding tray 511, transparent sleeve feeding track 512, transparent sleeve picking assembly 513, piston rod feeding mechanism 52, end cover feeding tray 521, end cover feeding track 522, end cover picking assembly 523, piston rod feeding tray 524, piston rod feeding track 525, piston rod picking assembly 526, piston rod assembly assembly 527, cam rod feeding mechanism 53, cam rod feeding tray 531, cam rod feeding track 532, cam rod picking assembly 533, inner piston turntable mechanism 54, piston assembly fixture 541, pressing mechanism 55, pressing drive cylinder 551, pressing block 552, inner piston assembly mechanism 56, picking transmission module 561, picking assembly clamp 562;

[0052] Cam sleeve assembly mechanism 6, cam sleeve feeding tray 61, cam sleeve feeding track 62, cam sleeve picking assembly 63, cam sleeve picking clamp 631, cam orientation mechanism 64;

[0053] Inner spring assembly mechanism 7, inner spring feeding tray 71, inner spring feeding track 72, inner spring taking assembly 73;

[0054] Tail cover assembly mechanism 8, tail cover feeding tray 81, tail cover feeding track 82, tail cover taking component 83;

[0055] The conveying jig 9 , the jig bottom plate 91 , the positioning groove 911 , the positioning pin hole 912 , the fixed placement seat 92 , the first placement groove 921 , the second placement groove 922 , and the assembly mechanism 10 . DETAILED DESCRIPTION

[0056] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0057] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Figures 1 to 16As shown, one embodiment of the present application relates to a medical injection practice pen automatic assembly line, comprising a circulating conveying mechanism 1, a positioning mechanism 2, a shell feeding mechanism 3, a barrel assembly mechanism 4, an inner piston assembly mechanism 5, a cam sleeve assembly mechanism 6, an inner spring assembly mechanism 7, and a tail cover assembly mechanism 8. The circulating conveying mechanism 1 is provided with a conveying jig 9, and the positioning mechanism 2 is used to position the conveying jig 9 on the circulating conveying mechanism 1. The circulating conveying mechanism 1 is used to drive the conveying jig 9 to pass through the shell feeding mechanism 3, the barrel assembly mechanism 4, the inner piston assembly mechanism 5, the cam sleeve assembly mechanism 6, the inner spring assembly mechanism 7, and the tail cover assembly mechanism 8 in sequence. The shell feeding mechanism 3 is used to place a shell and a piston sleeve on the conveying jig 9. The barrel assembly mechanism 4 is used to assemble a barrel and place it on the piston sleeve. The inner piston assembly mechanism 5 is used to assemble an inner piston and place it on the barrel. The cam sleeve assembly mechanism 6 is used to assemble a cam sleeve and place it on the inner piston. The inner spring assembly mechanism 7 is used to place an inner spring on the inner piston. One side of the inner spring assembly mechanism 7 is provided with a combination mechanism 10, which is used to grab and place a completely assembled barrel on the shell. The tail cover assembly mechanism 8 is used to place a tail cover on the shell. This embodiment adopts full automation assembly. The conveying jig 9 is moved by the circulating conveying mechanism 1, and is positioned by the positioning mechanism 2 during the conveying process. The automatic assembly of each accessory is carried out in sequence. This embodiment solves the problems of low efficiency and high difficulty of manual assembly. It greatly increases the production capacity and reduces the production cost, and is suitable for mass production.

[0059] This embodiment integrates a circulating conveying mechanism 1 with multiple precision positioning and assembly mechanisms to achieve fully automated operation of the medical injection practice pen, from shell loading to tail cap assembly. This continuous, uninterrupted production process significantly shortens production cycle time, reduces manual intervention and waiting time, and thus significantly improves production efficiency and overall capacity. With the same manpower allocation, it can produce more high-quality products, meeting the growing market demand for medical teaching and practice tools. The automated assembly line utilizes a high-precision positioning mechanism 2 and specialized assembly equipment to ensure precise execution of each assembly step. From the precise matching of the shell and piston sleeve to the layer-by-layer assembly of the syringe, inner piston, cam sleeve, and inner spring, all are completed under strict process control, effectively avoiding the errors and defective products that may be introduced by manual assembly. This highly consistent production method not only improves overall product quality but also enhances user experience and trust. The introduction of the automated assembly line significantly reduces labor requirements on the production line, reducing labor costs. Furthermore, by reducing manual operations, errors and scrap rates caused by human factors are reduced, further saving raw materials and production costs. In addition, the stable operation and efficient output of automated equipment also provide enterprises with more flexible production scheduling space, helping enterprises to quickly adjust production plans according to market demand and improve market response speed.

[0060] Traditional medical device assembly often involves complex manual operations and potential mechanical injury risks. The use of automated assembly lines, however, frees workers from heavy manual labor and high-risk working environments, improving working conditions and reducing the risk of occupational injury. Furthermore, the equipment's internal safety protection mechanisms and emergency shutdown functions provide strong safeguards for production safety. This embodiment, with its efficient, precise, safe, and intelligent technical features, has brought significant technical and economic benefits to medical device production.

[0061] See Figure 4As shown, the circulating conveying mechanism 1 includes an upper conveying component 11, a lower conveying component 12, a first lifting component 13 and a second lifting component 14. A connecting frame 15 is provided between the upper conveying component 11 and the lower conveying component 12. The first lifting component 13 and the second lifting component 14 are respectively provided at the two ends of the lower conveying component 12 and the upper conveying component 11 to form a closed-loop conveying channel, which is used for conveying the jig 9. Specifically, the upper conveying component 11 is provided with multiple groups, and the two adjacent groups of upper conveying components 11 are connected end to end; the lower conveying component 12 is provided with multiple groups, and the two adjacent groups of lower conveying components 12 are connected end to end; the upper conveying component 11 and the lower conveying component 12 are opposite to each other in the upper and lower directions. In this embodiment, through the ingenious layout of the upper and lower conveying components 12 and the end-to-end connection design between the multiple groups of components, efficient and continuous material transmission is achieved, which significantly improves the automation level of the assembly line. The arrangement of the first and second lifting assemblies 14 not only creates a closed-loop conveying channel, ensuring seamless jig transfer, but also optimizes space utilization and reduces waiting time during material handling. The relative configuration of the upper and lower layers effectively utilizes vertical space, making the production line layout more compact and improving overall production efficiency. In addition, this mechanism enhances the flexibility of the production process, making it easier to adjust the jig conveying speed and path according to production needs.

[0062] The upper conveying assembly 11 includes an upper conveying frame 111, an upper conveying roller 112, an upper conveying belt 113, an upper conveying motor 114 and an upper conveying baffle 115. The upper conveying roller 112 is arranged at both ends of the upper conveying frame 111, and the upper conveying belt 113 is connected to the upper conveying roller 112 for transmission. The upper conveying motor 114 is arranged on the connecting frame 15 and is driven and connected to the upper conveying roller 112; the upper conveying baffle 115 is arranged on both sides of the upper conveying frame 111, and an upper conveying trough is formed on the upper side of the upper conveying belt 113. The upper conveying belt 113 is used to drive the conveying jig 9 to be transmitted along the upper conveying trough. Specifically, the lower conveying assembly 12 includes a lower conveying frame 121, a lower conveying roller 122, a lower conveying belt 123, a lower conveying motor 124, and a lower conveying baffle 125. The lower conveying roller 122 is arranged at both ends of the lower conveying frame 121, the lower conveying belt 123 is connected to the lower conveying roller 122, and the lower conveying motor 124 is arranged on the connecting frame 15 and is driven by the lower conveying roller 122. The lower conveying baffle 125 is arranged on both sides of the lower conveying frame 121 and forms a lower conveying trough on the upper side of the lower conveying belt 123. The lower conveying belt 123 is used to drive the conveying jig 9 to be transported along the lower conveying trough. In this embodiment, the upper conveying trough of the upper conveying belt 113 and the lower conveying trough of the lower conveying belt 123 achieve rapid diversion and orderly transmission of the conveying jig 9. The upper and lower conveyor motors 124 are independently driven, ensuring flexible adjustment of conveying speeds in each area to meet the time synchronization requirements of different processes. The stable arrangement of conveyor rollers and the close coordination of the conveyor belt reduce vibration and deviation during material transfer and improve assembly accuracy.

[0063] See Figure 5~Figure 6As shown, the conveying jig 9 includes a jig base plate 91 and a fixed placement seat 92, and the fixed placement seat 92 is provided with a first placement groove 921 for placing the piston sleeve and a second placement groove 922 for placing the shell; the positioning mechanism 2 includes a conveying positioning module 21 and a position positioning module 22, and the conveying positioning module 21 includes a first fixed frame 211, a conveying positioning cylinder 212 and a conveying positioning pressure block 213 arranged on the upper conveying component 11, the conveying positioning cylinder 212 is arranged on the first fixed frame 211, and the conveying positioning pressure block 213 is arranged at the driving end of the conveying positioning cylinder 212, and the conveying positioning pressure block 213 is provided with a positioning surface 214 facing the conveying direction of the conveying jig 9, and the positioning surface 214 is used to position the jig base plate 91 on the upper conveying component 11. Specifically, the position positioning module 22 is located on one side of the conveying positioning module 21. The positioning surface 214 is provided with a positioning pressure plate 215. The position positioning module 22 includes a lifting cylinder 221 and a lifting positioning block 222. The lifting positioning block 222 is opposite to the positioning pressure plate 215 to clamp and position the jig base plate 91. The lifting positioning block 222 is provided with a position positioning block 223. The jig base plate 91 is provided with a positioning groove 911. The position positioning block 223 is used to cooperate with the positioning groove 911 to position the jig base plate 91 and form a double-sided positioning structure in combination with the positioning surface 214. The upper side of the position positioning block 223 is provided with a positioning inclined surface. The lifting positioning block 222 is provided with positioning pins 224 on both sides of the position positioning block 223. The jig base plate 91 is provided with positioning pin holes 912 on both sides. The positioning pin holes 912 cooperate with the positioning pins 224 to position the jig base plate 91. In this embodiment, by integrating the jig base plate 91 and the fixed placement seat 92, the precise placement of key components such as the piston is ensured, thereby improving the stability and accuracy of the assembly process. The synergistic effect of the conveying positioning module 21 and the position positioning module 22 not only realizes the rapid positioning of the jig base plate 91 on the upper conveying assembly 11, but also constructs a stable double-sided positioning structure through the double-sided clamping design of the positioning surface 214 of the conveying positioning pressure block 213 and the lifting positioning block 222, effectively preventing the jig base plate 91 from deviating during the conveying process, and ensuring the consistency and efficiency of subsequent assembly operations. In addition, the positioning bevel on the position positioning block 223 is tightly matched with the positioning groove 911 of the jig base plate 91, combined with the precise docking of the positioning pin 224 and the positioning pin hole 912, further enhancing the positioning accuracy and reliability, and reducing assembly errors. The combined effect of these design features significantly improves the automation level and production efficiency of the medical injection practice pen assembly line, while ensuring the consistency of product quality.

[0064] See Figures 7 to 9As shown, the syringe assembly mechanism 4 includes a syringe loading device 41, a first spring loading device 42, a second spring loading device 43, a syringe turntable device 44 and a syringe picking mechanism 45. The syringe turntable device 44 is provided with a syringe assembly jig 441. The syringe loading device 41 is used to load the syringe onto the syringe assembly jig 441. The syringe turntable device 44 is used to drive the syringe assembly jig 441 to pass through the first spring loading device 42 and the second spring loading device 43 in sequence. The first spring loading device 42 is used to install the first spring on the outer diameter of the syringe, and the second spring loading device 43 is used to install the second spring on the inner diameter of the syringe. The syringe picking mechanism 45 is used to grab the assembled syringe and install it on the piston cylinder. In this embodiment, through the integrated syringe loading, spring automatic installation and syringe picking functions, the syringe and spring are quickly and accurately assembled, which effectively reduces manual intervention and reduces the rate of operational errors. The design of the syringe turntable assembly 44 allows syringes to flow smoothly between various processes, ensuring the continuity and stability of the production process. Furthermore, the first and second springs are precisely positioned on the inner and outer diameters of the syringe, meeting the stringent syringe structural requirements of the injection practice pen. Finally, the syringe removal mechanism 45 precisely mounts the assembled syringe onto the piston cylinder.

[0065] The syringe loading device 41 includes a syringe feeding tray 411, a syringe feeding track 412 and a syringe picking assembly 413. The syringe feeding track 412 is connected to the syringe feeding tray 411. The syringe picking assembly 413 is used to grab the syringe on the syringe feeding track 412 and place it on the syringe assembly jig 441; the syringe picking assembly 413 is provided with a syringe picking rotating module 4131 and a syringe clamping module 4132. The syringe picking rotating module 4131 is used to drive the syringe clamping module 4132 to rotate to adjust the angle of the syringe picking, and the syringe clamping module 4132 is used to clamp the syringe for loading. The first spring loading device 42 includes a first spring feeding tray 421, a first spring feeding track 422, and a first spring picking assembly 423. The first spring feeding track 422 is connected to the first spring feeding tray 421, and the first spring picking assembly 423 is used to grab the first spring on the first spring feeding track 422 to be assembled to the outer diameter of the syringe. The second spring loading device 43 includes a second spring feeding tray 431, a second spring feeding track 432, and a second spring picking assembly 433. The second spring feeding track 432 is connected to the second spring feeding tray 431, and the second spring picking assembly 433 is used to grab the second spring on the second spring feeding track 432 to be assembled to the inner diameter of the syringe. In this embodiment, the independent feeding systems of the syringe, the first spring, and the second spring achieve continuity and stability in material supply, effectively improving assembly efficiency and consistency. The design of the piston and syringe retrieving components, particularly the rotating and clamping module within syringe retrieving assembly 413, allows for flexible adjustment of the gripping angle, ensuring accurate syringe loading and reducing human error. Furthermore, the automated assembly of the first and second springs, tailored to the inner and outer diameters of the syringe, not only improves assembly accuracy but also significantly shortens the assembly cycle. Overall, the application of this retrieving mechanism not only optimizes the production process, improves production efficiency and product quality, but also reduces labor costs.

[0066] The syringe picking mechanism 45 includes a gantry 451, an assembly transfer transmission module 452 and a transfer grabbing device 453. The assembly transfer transmission module 452 is arranged on the gantry 451, and the transfer grabbing device 453 is arranged on the assembly transfer transmission module 452. The transfer grabbing device 453 includes a transverse bracket 4531 and two sets of assembly manipulators 4532 arranged on the transverse bracket 4531. A directional shaft sleeve 442 is provided on one side of the syringe turntable device 44. The directional shaft sleeve 442 is used for the needle The assembly transfer transmission module 452 is used to drive two groups of assembly manipulators 4532 to alternate between the syringe assembly jig 441, the directional sleeve 442 and the conveying jig 9; the assembly manipulator 4532 is provided with a direction adjustment motor 4533 and a grabbing air gripper 4534, the direction adjustment motor 4533 is used to adjust the pay-out of the grabbed syringe, and the grabbing air gripper 4534 is used to grab the syringe; the gantry 451 is provided with a CCD camera 4511 to photograph the assembly status and direction of the syringe. In this embodiment, the gantry 451 has a stable structure and provides a solid support platform for the entire material collection process. The flexible layout of the assembly transfer transmission module 452 on the gantry 451, combined with the precise operation of the transfer grabbing device 453, realizes the seamless connection and efficient transfer of the syringe from the assembly jig to the directional sleeve 442 and then to the conveying jig 9. The coordinated operation of the direction adjustment motor 4533 and the gripping air gripper 4534 not only ensures accurate syringe gripping but also allows flexible adjustment of the syringe's direction to meet assembly precision requirements. The installation of the directional bushing 442 significantly improves the accuracy of the syringe's directional positioning, preventing assembly errors. The CCD camera 4511 integrated into the gantry 451 monitors the syringe's assembly status and direction in real time, providing intuitive guidance for quality control and ensuring the final product's pass rate.

[0067] See Figures 10 to 13As shown, the inner piston assembly mechanism 5 includes a transparent sleeve feeding mechanism 51, a piston rod feeding mechanism 52, a cam rod feeding mechanism 53, an inner piston turntable mechanism 54, a pressing mechanism 55 and an inner piston assembly mechanism 56; the inner piston turntable mechanism 54 is used to drive the piston assembly jig 541 to pass through the transparent sleeve feeding mechanism 51, the piston rod feeding mechanism 52, the cam rod feeding mechanism 53, the pressing mechanism 55 and the inner piston assembly mechanism 56 in sequence, the transparent sleeve feeding mechanism 51 is used to automatically feed the transparent sleeve to the piston assembly jig 541, and the piston rod feeding mechanism 52 is used to The piston rod is loaded onto a transparent sleeve for assembly. The cam rod loading mechanism 53 is used to load and assemble the cam rod onto the transparent sleeve. The clamping mechanism 55 is used to clamp and assemble the cam rod onto the transparent sleeve and limit the piston rod. The inner piston assembly mechanism 56 is used to capture the assembled cam rod and assemble it, along with the transparent sleeve, onto the piston sleeve. The cam sleeve assembly mechanism 6 is used to capture and orient the cam sleeve before assembling it onto the piston rod. The cam sleeve assembly mechanism 6 is used to capture and assemble the cam sleeve onto the cam rod. The inner spring assembly mechanism 7 is used to install the inner spring into the inner diameter of the cam rod. In this embodiment, the automated loading and precise assembly of the transparent sleeve, piston rod, and cam rod ensures seamless connection and stability between the various components, reducing human operational errors. The introduction of the clamping mechanism 55 effectively ensures a tight fit between the cam rod and the transparent sleeve, while limiting the position of the piston rod and enhancing the overall stability of the structure. The inner piston assembly mechanism 56 further precisely installs the assembled components onto the piston sleeve, enabling rapid integration between components. In addition, the automated assembly of the cam sleeve and inner spring not only improves assembly efficiency, but also ensures the integrity and functionality of the product's internal structure, providing reliable performance guarantees for the medical injection practice pen.

[0068] The transparent sleeve feeding mechanism 51 comprises a transparent sleeve feeding tray 511, a transparent sleeve feeding track 512 and a transparent sleeve taking component 513. One end of the transparent sleeve feeding track 512 is connected with the transparent sleeve feeding tray 511. The transparent sleeve taking component 513 is used to place the transparent sleeve on the piston assembly jig 541. The piston rod feeding mechanism 52 comprises an end cap feeding tray 521, an end cap feeding track 522, an end cap taking component 523, a piston rod feeding tray 524, a piston rod feeding track 525, a piston rod taking component 526 and a piston rod assembling component 527. The end cap feeding tray 521 is used to transport the end cap to the end cap feeding track 522. The end cap taking component 523 is used to take the end cap to the piston rod assembling component 527. The piston rod feeding tray 524 is used to feed the piston rod to the piston rod feeding track 525. The piston rod taking component 526 is used to take the piston rod on the piston rod feeding track 525 and assemble it with the end cap, and then place it on the transparent sleeve on the piston assembly jig 541. The cam rod feeding mechanism 53 comprises a cam rod feeding tray 531, a cam rod feeding track 532 and a cam rod taking component 533. One end of the cam rod feeding track 532 is connected with the cam rod feeding tray 531. The cam rod taking component 533 is used to place the cam rod on the transparent sleeve on the cam rod feeding track 532. In this embodiment, the transparent sleeve feeding mechanism 51 ensures the smooth feeding and accurate positioning of the sleeve, which lays a solid foundation for the subsequent assembly steps. The piston rod feeding mechanism 52 realizes the automatic combination of the end cap and the piston rod through the integrated feeding and assembling process, and then accurately places them in the transparent sleeve, greatly reducing manual intervention and improving the consistency and speed of assembly. The cam rod feeding mechanism 53 ensures the rapid and accurate installation of the cam rod, further consolidating the mechanical structure and functional integrity of the practice pen.

[0069] The clamping mechanism 55 includes a clamping drive cylinder 551 and a clamping block 552, which are used to clamp the cam rod onto the transparent sleeve; the inner piston assembly mechanism 56 includes a material picking transmission module 561 and a material picking assembly clamp 562, and the material picking assembly clamp 562 is used to grab and place the assembled transparent sleeve on the piston sleeve. One side of the circulating conveying mechanism 1 is provided with a clamping component with the same structure as the clamping mechanism 55, and the clamping component is used to press the transparent sleeve into the piston sleeve. In this embodiment, the clamping mechanism 55 ensures that the cam rod is firmly assembled to the transparent sleeve through the precise coordination of the clamping drive cylinder 551 and the clamping block 552, thereby improving the tightness and consistency of the assembly and reducing the failure rate caused by improper assembly. The inner piston assembly mechanism 56 utilizes the efficient operation of the material picking transmission module 561 and the clamping claw to achieve accurate grabbing and placement of the transparent sleeve on the piston sleeve, significantly improving assembly efficiency and product quality. At the same time, the same structural compression assembly provided on the circulating conveying mechanism 1 further ensures that the transparent sleeve can be pressed smoothly and tightly into the interior of the piston sleeve, thus achieving a smooth and coherent overall assembly process.

[0070] See Figure 14-15As shown, the cam sleeve assembly mechanism 6 includes a cam sleeve feed tray 61, a cam sleeve feed track 62, a cam sleeve pick-up assembly 63, and a cam orientation mechanism 64. One end of the cam sleeve feed track 62 is connected to the cam sleeve feed tray 61. The cam sleeve pick-up assembly 63 is provided with a plurality of cam sleeve pick-up clamps 631. The plurality of cam sleeve pick-up clamps 631 are alternately driven by the cam sleeve feed track 62, the cam orientation mechanism 64, and the conveying jig 9 to assemble the cam sleeve on the cam rod. The inner spring assembly mechanism 7 includes an inner spring feed tray 71, an inner spring feed track 72, and an inner spring pick-up assembly 73. One end of the inner spring feed track 72 is connected to the inner spring feed tray 71. The inner spring pick-up assembly 73 is used to grab the inner spring on the inner spring feed track 72 and place it on the inner diameter of the cam rod. The tail cover assembly mechanism 8 includes a tail cover feeding tray 81, a tail cover feeding track 82 and a tail cover picking assembly 83. One end of the tail cover feeding track 82 is connected to the tail cover feeding tray 81, and the tail cover picking assembly 83 is used to grab the tail cover on the tail cover feeding track 82 and assemble it to one end of the shell. In this embodiment, the continuous and stable supply of key components such as the cam sleeve, inner spring and tail cover is ensured by the automated feeding tray and track system, which reduces manual intervention and avoids errors and delays caused by human factors. The alternating transmission design of the cam sleeve picking assembly 63, in conjunction with the cam orientation mechanism 64, realizes the precise assembly of the cam sleeve on the cam rod, ensuring the close fit and movement accuracy between the components. The precise grabbing and placement of the inner spring picking assembly 73 effectively guarantees the correctness of the inner spring assembly position and enhances the performance and life of the practice pen. The tail cover picking assembly 83 ensures the stable connection between the tail cover and the shell, improving the overall sealing and aesthetics of the product.

[0071] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An automatic assembly line for medical injection practice pens, characterized by: It includes a circulating conveying mechanism, a positioning mechanism, a shell feeding mechanism, a syringe assembly mechanism, an inner piston assembly mechanism, a cam sleeve assembly mechanism, an inner spring assembly mechanism and a tail cover assembly mechanism. The circulating conveying mechanism is provided with a conveying jig, and the positioning mechanism is used to position the conveying jig on the circulating conveying mechanism. The circular conveying mechanism is used to drive the conveying jig to pass through the shell feeding mechanism, the syringe assembly mechanism, the inner piston assembly mechanism, the cam sleeve assembly mechanism, the inner spring assembly mechanism and the tail cover assembly mechanism in sequence; the shell feeding mechanism is used to place the shell and the piston sleeve on the conveying jig; the syringe assembly mechanism is used to assemble the syringe and install it on the piston sleeve; the inner piston assembly mechanism is used to assemble the inner piston and install it on the syringe; the cam sleeve assembly mechanism is used to assemble the cam kit and install it on the inner piston; the inner spring assembly mechanism is used to install the inner spring on the inner piston; A combination mechanism is provided on one side of the inner spring assembly mechanism, and the combination mechanism is used to grab the fully assembled syringe and install it on the shell, and the tail cover assembly mechanism installs the tail cover on the shell; The circulating conveying mechanism includes an upper conveying assembly, a lower conveying assembly, a first lifting assembly and a second lifting assembly. A connecting frame is provided between the upper conveying assembly and the lower conveying assembly. The first lifting assembly and the second lifting assembly are respectively arranged at the two ends of the lower conveying assembly and the upper conveying assembly to form a closed-loop conveying channel, which is used for conveying jigs. The upper conveying assembly is provided with multiple groups, and two adjacent groups of upper conveying assemblies are connected end to end; the lower conveying assembly is provided with multiple groups, and two adjacent groups of lower conveying assemblies are connected end to end; the upper conveying assembly and the lower conveying assembly are opposite to each other in vertical direction; The conveying jig includes a jig base plate and a fixed placement seat, the fixed placement seat is provided with a first placement groove for placing the piston sleeve and a second placement groove for placing the shell; the positioning mechanism includes a conveying positioning module and a position positioning module, the conveying positioning module includes a first fixed frame provided on the upper conveying assembly, a conveying positioning cylinder and a conveying positioning pressure block, the conveying positioning cylinder is provided on the first fixed frame, the conveying positioning pressure block is provided at the driving end of the conveying positioning cylinder, the conveying positioning pressure block is provided with a positioning surface facing the conveying direction of the conveying jig, and the positioning surface is used to position the jig base plate on the upper conveying assembly; The position positioning module is located on one side of the conveying positioning module, and the positioning surface is provided with a positioning pressure plate. The position positioning module includes a lifting cylinder and a lifting positioning block. The lifting positioning block is opposite to the positioning pressure plate to clamp and position the fixture bottom plate. The lifting positioning block is provided with a position positioning block, and the fixture bottom plate is provided with a positioning groove. The position positioning block is used to cooperate with the positioning groove to position the fixture bottom plate, and form a double-sided positioning structure in combination with the positioning surface; the upper side of the position positioning block is provided with a positioning inclined surface; The lifting positioning block is located at both sides of the position positioning block and is provided with positioning pins. Both sides of the fixture base plate are provided with positioning pin holes. The positioning pin holes cooperate with the positioning pins to position the fixture base plate.

2. The automatic assembly line for medical injection practice pens according to claim 1, characterized in that: The upper conveying assembly includes an upper conveying frame, an upper conveying roller, an upper conveying belt, an upper conveying motor and an upper conveying baffle. The upper conveying rollers are arranged at both ends of the upper conveying frame, the upper conveying belt is connected to the upper conveying rollers, and the upper conveying motor is arranged on the connecting frame and is connected to the upper conveying rollers. The upper conveying baffles are arranged on both sides of the upper conveying frame and form an upper conveying trough on the upper side of the upper conveying belt. The upper conveying belt is used to drive the conveying jig to be transported along the upper conveying trough. The lower conveying assembly includes a lower conveying frame, a lower conveying roller, a lower conveying belt, a lower conveying motor and a lower conveying baffle. The lower conveying rollers are arranged at both ends of the lower conveying frame, the lower conveying belt is connected to the lower conveying rollers for transmission, and the lower conveying motor is arranged on the connecting frame and is connected to the lower conveying rollers for driving; the lower conveying baffles are arranged on both sides of the lower conveying frame and form a lower conveying trough on the upper side of the lower conveying belt. The lower conveying belt is used to drive the conveying jig to transmit along the lower conveying trough.

3. The automatic assembly line for medical injection practice pens according to claim 1, characterized in that: The syringe assembly mechanism includes a syringe loading device, a first spring loading device, a second spring loading device, a syringe turntable device and a syringe picking mechanism. The syringe turntable device is provided with a syringe assembly jig. The syringe loading device is used to load the syringe onto the syringe assembly jig. The syringe turntable device is used to drive the syringe assembly jig to pass through the first spring loading device and the second spring loading device in sequence. The first spring loading device is used to install the first spring on the outer diameter of the syringe, and the second spring loading device is used to install the second spring on the inner diameter of the syringe; the syringe picking mechanism is used to grab the assembled syringe and install it on the piston cylinder.

4. The automatic assembly line for medical injection practice pens according to claim 3, characterized in that: The syringe feeding device includes a syringe feeding tray, a syringe feeding track and a syringe picking assembly. The syringe feeding track is connected to the syringe feeding tray. The syringe picking assembly is used to grab the syringe on the syringe feeding track and place it on the syringe assembly jig. The syringe picking assembly is provided with a syringe picking rotating module and a syringe clamping module. The syringe picking rotating module is used to drive the syringe clamping module to rotate to adjust the angle of the syringe picking. The syringe clamping module is used to clamp the syringe for feeding. The first spring feeding device includes a first spring feeding tray, a first spring feeding track and a first spring picking assembly, wherein the first spring feeding track is connected to the first spring feeding tray, and the first spring picking assembly is used to grab the first spring on the first spring feeding track to be assembled to the outer diameter of the syringe; The second spring feeding device includes a second spring feeding tray, a second spring feeding track and a second spring picking assembly, wherein the second spring feeding track is connected to the second spring feeding tray, and the second spring picking assembly is used to grab the second spring on the second spring feeding track and assemble it to the inner diameter of the syringe; The syringe picking mechanism includes a gantry, an assembly transfer transmission module and a transfer grabbing device. The assembly transfer transmission module is arranged on the gantry, and the transfer grabbing device is arranged on the assembly transfer transmission module. The transfer grabbing device includes a transverse bracket and two groups of assembly robots arranged on the transverse bracket. A directional sleeve is provided on one side of the syringe turntable device, and the directional sleeve is used for positioning the direction of the syringe. The assembly transfer transmission module is used to drive the two groups of assembly robots to alternate between the syringe assembly jig, the directional sleeve and the conveying jig; the assembly robot is provided with a direction adjustment motor and a grabbing claw, and the direction adjustment motor is used to adjust the pay-off of the grabbed syringe, and the grabbing claw is used to grab the syringe; a CCD camera is provided on the gantry to photograph the assembly condition and direction of the syringe.

5. The automatic assembly line for medical injection practice pens according to claim 1, characterized in that: The inner piston assembly mechanism includes a transparent sleeve feeding mechanism, a piston rod feeding mechanism, a cam rod feeding mechanism, an inner piston turntable mechanism, a pressing mechanism and an inner piston assembly mechanism; the inner piston turntable mechanism is used to drive the assembly jig to pass through the transparent sleeve feeding mechanism, the piston rod feeding mechanism, the cam rod feeding mechanism, the pressing mechanism and the inner piston assembly mechanism in sequence, the transparent sleeve feeding mechanism is used to automatically feed the transparent sleeve to the assembly jig, the piston rod feeding mechanism is used to feed the piston rod onto the transparent sleeve for assembly, the cam rod feeding mechanism is used to feed and assemble the cam rod onto the transparent sleeve, the pressing mechanism is used to press and assemble the cam rod onto the transparent sleeve, and limit the piston rod; the inner piston assembly mechanism is used to grab the assembled cam rod and assemble the transparent sleeve onto the piston sleeve; the cam sleeve assembly mechanism is used to grab and orient the cam sleeve and assemble it onto the piston rod, and the cam sleeve assembly mechanism is used to grab and assemble the cam sleeve onto the cam rod; the inner spring assembly mechanism is used to install an inner spring into the inner diameter of the cam rod; The transparent sleeve loading mechanism includes a transparent sleeve feeding tray, a transparent sleeve feeding track and a transparent sleeve picking assembly. One end of the transparent sleeve feeding track is connected to the transparent sleeve feeding tray. The transparent sleeve picking assembly is used to grab the transparent sleeve on the transparent sleeve feeding track and place it on the assembly jig.

6. The automatic assembly line for medical injection practice pens according to claim 5, characterized in that: The piston rod feeding mechanism includes an end cover feeding tray, an end cover feeding track, an end cover picking assembly, a piston rod feeding tray, a piston rod feeding track, a piston rod picking assembly and a piston rod assembly assembly. The end cover feeding tray is used to convey the end cover toward the end cover feeding track. The end cover picking assembly is used to pick up the end cover and place it on the piston rod assembly assembly. The piston rod feeding tray is used to feed the piston rod toward the piston rod feeding track. The piston rod picking assembly is used to grab the piston rod on the piston rod feeding track and assemble it with the end cover, and then place it on the transparent sleeve on the assembly jig for assembly. The cam rod feeding mechanism includes a cam rod feeding tray, a cam rod feeding track and a cam rod picking assembly, one end of the cam rod feeding track is connected to the cam rod feeding tray, and the cam rod picking assembly is used to grab the cam rod on the cam rod feeding track and place it on the transparent sleeve; The clamping mechanism includes a clamping drive cylinder and a clamping block for clamping the cam rod onto the transparent sleeve; the inner piston assembly mechanism includes a material picking transmission module and a material picking assembly clamp, and the material picking assembly clamp is used to grab the assembled transparent sleeve and place it on the piston sleeve; A pressing assembly with the same structure as the pressing mechanism is provided on one side of the circulating conveying mechanism, and the pressing assembly is used to press the transparent sleeve into the piston sleeve.

7. The automatic assembly line for medical injection practice pens according to claim 1, characterized in that: The cam sleeve assembly mechanism includes a cam sleeve feeding tray, a cam sleeve feeding track, a cam sleeve picking assembly and a cam orientation mechanism. One end of the cam sleeve feeding track is connected to the cam sleeve feeding tray. The cam sleeve picking assembly is provided with a plurality of cam sleeve picking claws. The plurality of cam sleeve picking claws are alternately driven by the cam sleeve feeding track, the cam orientation mechanism and the conveying jig to assemble the cam sleeve on the cam rod. The inner spring assembly mechanism includes an inner spring feeding tray, an inner spring feeding track, and an inner spring picking assembly, wherein one end of the inner spring feeding track is connected to the inner spring feeding tray, and the inner spring picking assembly is used to grab the inner spring on the inner spring feeding track and place it on the inner diameter of the cam rod; The tail cover assembly mechanism includes a tail cover feeding tray, a tail cover feeding track and a tail cover picking assembly, one end of the tail cover feeding track is connected to the tail cover feeding tray, and the tail cover picking assembly is used to grab the tail cover on the tail cover feeding track and assemble it to one end of the shell.

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