An assembly machine and assembly method for a needle hub and a needle

Abstract

The application discloses a needle seat and needle head assembling machine, which comprises a rack for mounting a prime mover and a working machine or an executing mechanism, a rotating part for realizing intermittent movement of a plurality of needle seats and needle heads and cooperating with the executing mechanism to realize each assembly step in the riveting process of the needle seat and the needle head, a driving device for driving the rotating part to move intermittently, a plurality of bases for carriers of the needle seats, which are arranged in a ring shape on the rotating part and transfer the needle seats according to the riveting steps of the needle seat and the needle head, a plurality of needle head guide press-fitting mechanisms corresponding to the bases one by one and floatingly arranged on the rotating part through a rotating lifting mechanism to realize the guiding of the needle head to the needle seat and the riveting steps of the needle seat and the needle head, and the rack is further provided with a needle seat feeding mechanism, a needle head feeding mechanism, a press-fitting mechanism and a discharging mechanism which are sequentially arranged outside the rotating part to realize the automatic assembly of the needle seat and the needle head.

Description

Technical Field

[0001] This invention relates to the field of medical device manufacturing technology, and in particular to an assembly machine and method for assembling a needle hub and a needle tip. Background Technology

[0002] Currently, when animals are sick, they are often treated with medication administered via syringe. The syringe needle is an indispensable part of the entire tool. Medication is delivered into the animal's body through the needle attached to the syringe. Veterinary syringes typically consist of a needle tip and a needle hub. For example, prior art application CN201921268207.1 discloses an oxidation-resistant aluminum-base syringe needle, which includes a conical aluminum needle hub and a cylindrical needle body. One end of the needle body is fixedly connected to the aluminum needle hub, and the other end of the needle body has a needle tip for piercing the skin. The outer surface of the aluminum needle hub is covered with an electroplated aluminum foil layer. Figure 13 As shown, the needle hub and needle tip are usually connected by riveting. In the prior art, the assembled injection needle tips are usually placed on the riveting machine one by one by hand for riveting. The loading and unloading after processing are both done manually, which increases the input of manual labor. In addition, if the operation is not careful when handling the injection needle tips manually, it is easy to be accidentally injured by the needle tip, which is a low safety. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned technical problems by providing a machine and method for assembling a needle hub and a needle tip, which can realize the automatic assembly of the needle hub and the needle tip.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an assembly machine for a needle hub and a needle tip, comprising:

[0005] A frame is used to mount a prime mover and a driven machine or actuator.

[0006] Rotary components are used to realize the intermittent movement of several needle holders and needles, and cooperate with the actuator to realize the various assembly steps in the process of riveting the needle holders and needles.

[0007] The driving device drives the rotating component to perform intermittent motion;

[0008] Several bases, serving as carriers for needle holders, are arranged in a ring on the rotating component to transfer the needle holders according to the needle holder and needle head riveting steps;

[0009] Several needle guide pressing mechanisms are one-to-one with the base and are floatingly mounted on the rotating part through a rotary lifting mechanism to realize the steps of guiding the needle to the needle seat and riveting the needle seat and the needle.

[0010] The frame is also provided with a needle seat feeding mechanism, a needle head feeding mechanism, a pressing mechanism, a feeding mechanism, and a controller, which are arranged sequentially around the outside of the rotating part.

[0011] The needle holder feeding mechanism installs the needle holders on the base in an intermittent rhythm;

[0012] The needle feeding mechanism installs the needles on the needle holder in an intermittent rhythm;

[0013] The pressing mechanism, according to an intermittent rhythm, rivets the needle seat and the needle head together through the needle-guided pressing mechanism;

[0014] The feeding mechanism, in an intermittent rhythm, removes the riveted needle and needle seat from the base and places them into the hopper;

[0015] The controller receives feedback information and issues action commands to the prime mover and the working machine or actuator.

[0016] To ensure that the needle holder can be stably held on the base after being installed on the base by the needle holder feeding mechanism, and to prevent the needle holder from falling off during rotation and causing empty work in subsequent assembly steps, a further preferred technical solution is to provide a needle holder detection mechanism on the frame between the needle holder feeding mechanism and the needle head feeding mechanism.

[0017] To prevent the needle guide pressing mechanism from detaching from the base when it is lifted upward by the rotary lifting mechanism, a further preferred technical solution is to provide a needle seat and needle positioning mechanism on the frame between the pressing mechanism and the feeding mechanism.

[0018] To ensure that the needle holder can be stably held on the base after being installed on the base by the needle holder feeding mechanism, and to prevent the needle holder from falling off during rotation and causing empty work in subsequent assembly steps, a further preferred technical solution is that the needle holder detection mechanism includes a first support rod corresponding to the base, and a second sensor is provided on the first support rod. The second sensor determines whether there is a needle holder on the base and feeds the information back to the controller, which then controls the actions of the needle feeding mechanism and the pressing mechanism.

[0019] To prevent the needle guide pressing mechanism from detaching from the base when it is lifted upward by the rotary lifting mechanism, a further preferred technical solution is that the needle positioning mechanism includes a cylinder bracket corresponding to the base, a third cylinder is provided on the cylinder bracket, and a pusher is provided at the end of the piston rod of the third cylinder.

[0020] To improve the positioning accuracy, reliability, and safety of the press-fitting process and to achieve a faster response, a further preferred technical solution is that the press-fitting mechanism includes a second support corresponding to the base. The second support is equipped with an electric cylinder, and a matching servo motor is mounted on one side of the electric cylinder on the second support. The electric cylinder mainly consists of a motor and a nut-screw mechanism. The servo motor is connected to the screw through a transmission gear. The screw is equipped with a sleeve-type nut, which moves linearly along the screw to press against the needle guide press-fitting mechanism, thereby achieving the riveting of the needle to the needle seat.

[0021] To prevent the connection between the needle guide pressing mechanism and the rotating part from causing deformation of the rotating part during pressing, a further preferred technical solution is that a support bearing is provided on the frame directly below the rotating part corresponding to the electric cylinder, which abuts against the base.

[0022] To change the distance between the needle guide pressing mechanism and the base, and to realize assembly steps such as needle guiding, pressing, and unloading, a further preferred technical solution is that the rotary lifting mechanism includes linear bearing assemblies corresponding to the number of bases. Each linear bearing assembly is arranged one-to-one with a needle guide pressing mechanism. Each linear bearing assembly is radially arranged along the rotating part on the side of the needle guide pressing mechanism near the center of the rotating part. Each linear bearing assembly includes two linear bearings, each linear bearing is vertically arranged through the rotary table, and each linear bearing contains a guide shaft. An upper connecting plate is provided at the upper end of two guide shafts in a set of linear bearings. The needle guide pressing mechanism is suspended on the upper connecting plate. A lower connecting plate is provided at the lower end of the two guide shafts in the set of linear bearings. A bearing is provided at one end of the lower connecting plate near the center of the rotating part, which is perpendicular to the radial direction of the rotating part and vertically arranged. A rotary cam is provided on the frame below several bearings. The rotary cam is provided with a cam surface that matches the entire riveting process. Several bearings abut against the cam surface of the rotary cam and rotate and move up and down, thereby driving the needle guide pressing mechanism to move up and down.

[0023] To achieve the steps of guiding the needle tip to the needle holder and riveting the needle holder to the needle tip, a further preferred technical solution is that the needle tip guiding and pressing mechanism includes a guide seat, and the guide seat is provided with a pressing head that penetrates the guide seat. The pressing head has a through guide hole, the upper end of the guide hole has a tapered receiving hole, and the lower part has a tapered riveting hole. The needle tip enters the guide hole through the tapered receiving hole and is inserted into the needle holder along the guide hole.

[0024] To ensure the needle holder can be stably placed on the base and is not easily dislodged during the rotation of the rotating component, and to provide centering for the needle holder, a further preferred technical solution includes: the upper part of the base has a conical tip, on which the needle holder can be fitted for centering; the middle part of the base has a ring platform, on which the bottom of the needle holder can abut against after being fitted onto the tip, allowing the needle holder to be stably placed; the lower part of the base is cylindrical, and the corresponding rotating component of the base has a through hole, in which the base is installed.

[0025] A method for assembling a needle hub and a needle tip includes the following steps:

[0026] S1: The needle holder is installed on the base by the needle holder feeding mechanism at a certain rhythm;

[0027] S2: The needle feeding mechanism is controlled by the controller to install the needle on the needle holder through the needle feeding mechanism and the needle guide pressing mechanism;

[0028] S3: The controller controls the pressing mechanism to rivet the needle head and the needle seat on the base having the needle head and the needle seat on the needle head and the pressing mechanism.

[0029] S4: The feeding mechanism is controlled by the controller to move the needle head and needle seat from the base to the hopper on the base with the riveted needle head and needle seat.

[0030] To ensure that the needle holder can be stably held on the base after being installed on the base by the needle holder feeding mechanism, and to prevent the needle holder from falling off during rotation, thus causing empty work in subsequent assembly steps, a further preferred technical solution is that, between steps S1 and S2, the needle holder detection mechanism detects whether there is a needle holder on the base and feeds the information back to the controller, while simultaneously connecting the needle guide pressing mechanism with the needle holder.

[0031] To prevent the needle guide pressing mechanism from detaching from the base when it is lifted upward by the rotary lifting mechanism, a further preferred technical solution is to use a needle base and needle positioning mechanism between steps S3 and S4 to restrict the riveted needle base and needle to the base, thereby detaching the needle guide pressing mechanism from the needle base.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: The automatic assembly machine for needles and needle holders of the present invention can automatically transport the needles and needle holders placed on the base to the pressing mechanism by the rotation of the rotary component, realizing the functions of automatic loading and unloading and assembly, avoiding the tedious manual operation of manual loading and unloading, and also avoiding the risk of injury during manual loading. By using the cam in conjunction with the intermittent rotation of the rotary component, the rotary lifting mechanism can automatically lift the needle after pressing, thereby facilitating the removal of the needle. Attached Figure Description

[0033] Figure 1 This is one of the isometric views of the present invention;

[0034] Figure 2 This is the second isometric drawing of the present invention;

[0035] Figure 3 For the present invention Figure 1 Top view;

[0036] Figure 4 This is a partial isometric view of the present invention;

[0037] Figure 5 This is an isometric view of the drive unit of the present invention;

[0038] Figure 6 This is a workstation diagram of the present invention;

[0039] Figure 7 This is an isometric view of the base of the present invention;

[0040] Figure 8 This is an isometric view of the rotary lifting mechanism of the present invention;

[0041] Figure 9 This is a cross-sectional view of the needle guide pressing mechanism of the present invention;

[0042] Figure 10 This is an isometric view of the press-fitting mechanism of the present invention;

[0043] Figure 11 This is one of the isometric views of the feeding mechanism of the present invention;

[0044] Figure 12 This is the second isometric view of the feeding mechanism of the present invention;

[0045] Figure 13 This is an isometric view of the needle head and needle socket of the present invention; Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0047] Example

[0048] like Figure 1-3As shown, the automatic riveting process of the needle head and needle seat is as follows: needle seat loading, needle seat detection, needle head loading, press-fitting and riveting of the needle head and needle seat to form an injection needle, and unloading of the injection needle after riveting. For each assembly step in the riveting process, a corresponding mechanism needs to be set up to implement the corresponding assembly step. Simultaneously, to achieve continuous assembly, the mechanisms are continuously arranged around the indexer. During intermittent movement, each mechanism can simultaneously implement the corresponding assembly step, while also continuously realizing the entire riveting process. Specifically, a needle seat and needle head assembly machine includes a frame 100, which is a box-type machine. The frame 100 is equipped with an indexer 170, which enables intermittent movement, allowing corresponding mechanisms to synchronously complete the corresponding assembly steps, and then continuously feed to the next mechanism, ultimately achieving the riveting of the needle seat 180 and the needle 190 to form an injection needle. The frame 100 is equipped with a drive motor 150 and a reducer 160. The output shaft of the drive motor 150 is connected to the input end of the reducer 160, and the output end of the reducer 160 is connected to the input end of the indexer 170. The reducer 160 matches the speed and transmits torque between the prime mover and the working machine or actuator.

[0049] like Figure 4 and Figure 5 As shown, the output end of the indexer 170 is connected to a rotary table 110. The rotary table 110 has several sets of bases 130. The number of bases 130 is related to the assembly steps of the needle holder 180 and the needle tip 190. Generally, one assembly step corresponds to one set of bases 130. To adjust the assembly frequency and match the intermittent beat of the indexer 170, a set of bases 130 may be set between two assembly steps for transition. Alternatively, two or more sets of bases 130 may be set in one assembly step to achieve the corresponding assembly steps. In this embodiment, the rotary table 110 has ten sets of bases 130, and the ten sets of bases 130 are arranged in a ring. The needle holders are arranged near the edge of the rotary table 110. Each group includes at least two bases 130. The two bases 130 in any group are equally spaced. The bases 130 are mainly used as carriers for the needle holders 180 and for transferring the needle holders 180. The bases 130 are fixed on the rotary table 110 and rotate with the rotary table 110 to transfer the needle holders 180 to the corresponding workstations of the assembly steps. Finally, the needle holders 180 and the needles 190 are riveted together to form an injection needle. After the riveted injection needles are unloaded, the bases 130 are vacated. Then, the needle holders are rotated back to the needle holder loading mechanism 200 to load the needle holders 180. This cycle continues.

[0050] A controller 900 is provided on the frame 100 on one side of the rotary table 110. The controller 900 is a PLC or MCU controller. The controller 900 receives sensor commands and sends action commands to the actuator.

[0051] like Figure 7 As shown, in order to ensure that the needle holder 180 can be stably placed on the base 130 and is not easily dislodged during the rotation of the rotary table 110, and to center the needle holder 180 so that the needle tip 190 can be positioned and engaged with the needle holder 180, this embodiment provides a base 130. The upper part of the base 130 has a conical tip 131, on which the needle holder 180 can be fitted to achieve centering of the needle holder 180; the middle part of the base 130 has a truncated ring 132, on which the needle holder 180 is fitted to the tip 131. After 31, the bottom of the needle holder 180 can abut against the ring platform 132, so that the needle holder 180 can be placed stably on the ring platform 132; the lower part of the base 130 is a cylinder 133, and the rotary disk 110 corresponding to the base 130 is provided with a through hole. The lower part of the base 130 is inserted into the through hole. The base 130 can be fixed by interference fit, or the lower part of the base 130 can be fixed by passing through the through hole on the rotary disk 110 and then locking it with nut 134.

[0052] like Figure 5 and Figure 9 As shown, the base 130 can support and transmit the needle holder 180, but a mechanism for supporting and transmitting the needle 190 is also needed. Therefore, a needle guide pressing mechanism 140 corresponding to the number of bases 130 is provided on the rotary table 110. Each base 130 is correspondingly provided with one needle guide pressing mechanism 140. The needle guide pressing mechanism 140 is radially arranged along the rotary table 110 on the side of the base 130 near the center of the rotary table 110. The needle guide pressing mechanism 140 is used to guide the needle 190 into the needle holder 130, and the pressing mechanism 500 realizes the riveting of the needle 190 and the needle holder 180. Specifically... The needle guide pressing mechanism 140 includes a guide seat 141, on which a pressing head 142 is provided. The pressing head 142 has a through guide hole, a tapered receiving hole 1421 at the upper end of the guide hole, and a tapered riveting hole 1422 at the lower part. The needle 190 enters the guide hole through the tapered receiving hole 1421 and is inserted into the needle seat 180 along the guide hole. Then, the pressing mechanism 500 applies pressure to the needle guide pressing mechanism 140. The tapered riveting hole 1422 of the pressing head 142 squeezes the upper end of the needle seat 180 to achieve the riveting of the needle 190 and the needle seat 180 to form an injection needle.

[0053] like Figure 8As shown, during the entire riveting process, the needle guide pressing mechanism 140 needs to move up and down along the vertical direction of the frame 100 as the rotary table 110 rotates, changing the distance between the needle guide pressing mechanism 140 and the base 130 to achieve assembly steps such as needle 190 guidance, pressing, and unloading. The needle guide pressing mechanism 140 is mounted on a rotary lifting mechanism 120, which includes linear bearing groups corresponding to the number of bases 130. Each linear bearing group corresponds to one needle guide pressing mechanism 140. Each linear bearing group is radially positioned along the rotary table 110 on the side of the needle guide pressing mechanism 140 near the center of the rotary table 110. Each linear bearing group includes two linear bearings 123, each linear bearing 123 is vertically positioned through the rotary table 110, and each linear bearing 123 is vertically positioned. A guide shaft 122 is provided inside the bearing 123. The upper end of the two guide shafts 122 in a set of linear bearings 123 is provided with an upper connecting plate 121. The guide seat 141 of the needle guide pressing mechanism 140 is suspended on the upper connecting plate 121. The upper connecting plate 121 is also provided with a through hole corresponding to the guide hole and communicating with the guide hole. The lower end of the two guide shafts 122 in a set of linear bearings 123 is provided with a lower connecting plate 124. The lower connecting plate 124 is provided with a bearing 125 that is perpendicular to the radial direction of the rotary disk 110 and is vertically arranged. Below the twenty bearings 125 is a rotary cam 126. The rotary cam 126 is provided with a cam surface that matches the entire riveting process. The bearings 125 abut against the cam surface of the rotary cam 126 and rotate and move up and down, thereby driving the needle guide pressing mechanism 140 to move up and down.

[0054] The needle holder 180, the needle 190, and the needle guide pressing mechanism 140 corresponding to the base 130 are used to continuously raise and lower the needle guide pressing mechanism 140. The positions of the needle holder 180, the needle 190, and the needle guide pressing mechanism 140 in the vertical direction are changed. At the same time, the needle holder feeding mechanism 200, the needle holder detection mechanism 300, the needle head feeding mechanism 400, the pressing mechanism 500, and the unloading mechanism 700 are used to realize the automatic assembly process of riveting the needle holder 180 and the needle 190.

[0055] like Figure 6As shown, to better understand the riveting process between the needle holder 180 and the needle tip 190, in this embodiment, with the device in a static state, the needle holder feeding mechanism 200 is defined as the first station, the base corresponding to the first station is the first base 1301, and the needle tip guiding and pressing mechanism 140 corresponding to the first station is the first needle tip guiding and pressing mechanism; according to the riveting and assembly sequence, the second station is the needle holder detection mechanism 300, corresponding to the second base 1302 and the second needle tip guiding and pressing mechanism; the third station is the needle tip feeding mechanism 400, corresponding to the third base 1303 and the third needle tip guiding and pressing mechanism; the fourth station is the pressing mechanism 500, which... The system includes a fifth base 1305, a sixth base 1306, and fifth and sixth needle guide pressing mechanisms; the fourth base 1304 serves as a transition base between the third and fourth stations; the fifth station is a needle holder and needle positioning mechanism 600, corresponding to the seventh base 1307 and the seventh needle guide pressing mechanism; the sixth station is a feeding mechanism 700, corresponding to the ninth base 1309 and the ninth needle guide pressing mechanism; the eighth base 1308 serves as a transition base between the fifth and sixth stations; and the seventh station is a detection station 800 or a transition station, corresponding to the tenth base 1310 and the tenth needle guide pressing mechanism.

[0056] During the dynamic process, the first base 1301 and the first needle guide pressing mechanism advance from the first station to the seventh station as the rotary table 110 rotates, that is, the position of the first base 1301 and the first needle guide pressing mechanism in the static state gradually changes towards the position of the tenth base 1310 and the tenth needle guide pressing mechanism.

[0057] This embodiment details how each workstation completes the corresponding assembly steps in the riveting process. Specifically, the needle seat feeding mechanism 200 corresponding to the first workstation is set on the frame 100 outside the rotary table 110 corresponding to the first base 1301. The needle seat feeding mechanism 200 includes a vibratory feeder, which adjusts and feeds the needle seats 180 according to the same needle seat state with the riveting end facing upward. The output end of the vibratory feeder is provided with a flat vibrating table, and the discharge end of the flat vibrating table is provided with a dropping plate. The dropping plate extends between the first base 1301 and the first needle head guiding and pressing mechanism. At this time, the first needle head guiding and pressing mechanism is located at a high position in the rotary lifting mechanism 120. There is a large space between the first needle head guiding and pressing mechanism and the base 130 to accommodate the dropping plate. The dropping plate is provided with a dropping groove that is offset from the discharge end along the tangential direction of the rotary table 110. The dropping groove is directly opposite the first base 1301 below. 301, the number of the material discharge troughs matches the number of the first bases 1301. In this embodiment, the flat vibrating table has two discharge ends. The material discharge plate is provided with two material discharge troughs that correspond one-to-one with the two first bases 1301. A pusher plate is provided above the material discharge troughs. The pusher plate is provided with material troughs that correspond one-to-one with the two discharge ends and are connected to the discharge ends. A first cylinder is provided on the material discharge plate at one end of the pusher plate along the tangent direction of the rotary table 110. The piston rod of the first cylinder is connected to the pusher plate. The needle seat 180 enters the material trough of the pusher plate from the discharge end of the flat vibrating table. Then, the first cylinder pushes the needle seat along the tangent direction of the rotary table 110 to move into the material discharge trough above the material discharge plate through the pusher plate. Then, it falls directly into the first base 1301 from the material discharge trough. The riveting end of the needle seat 180 is fitted upward on the first base 1301, and the bottom of the needle seat 180 abuts against the ring platform of the first base 1301.

[0058] In another embodiment, the needle holder feeding mechanism 200 corresponding to the first station can also use a robotic arm with a suction cup for feeding. The robotic arm moves the needle holder 180 on the flat vibrating table to the first base 1301. The robotic arm moves the suction cup above the needle holder 180 on the flat vibrating table to attract the needle holder 180. Then it moves above the first base 1301 and closes the suction cup, so that the needle holder 180 automatically falls onto the needle holder 180.

[0059] The above implementation method specifically illustrates how to install the needle holder on the first base 1301 at the first station to realize the feeding of the needle holder 180 and supply the needle holder for the riveting of the needle holder 180 and the needle 190.

[0060] In order to realize the automatic operation of the first cylinder, a first sensor is provided on one side of the discharge end of the flat vibrating table to detect the supply of needle holder 180, determine whether there is needle holder 180 supplied, and control the operation of the first cylinder through the controller.

[0061] like Figure 6 As shown, the needle seat detection mechanism 300 corresponding to the second station is set on the frame 100 outside the rotary table 110 corresponding to the second base 1302. The needle seat detection mechanism 300 includes a first support rod 302 corresponding to the base 130. A second sensor 301 is provided on the first support rod 302. The second sensor 301 determines whether there is a needle seat 180 on the base and feeds the information back to the controller 900. Then the controller 900 controls the action of the needle feeding mechanism 400 and the pressing mechanism 500. In this embodiment, the second station corresponds to two second bases 1302. The corresponding needle seat detection mechanism 300 includes two first support rods 302. Each first support rod 302 is provided with a second sensor 301, which is set one-to-one with the two second bases 1302.

[0062] While the needle holder 130 is being tested, the needle guide pressing mechanism 140 falls with the rotary lifting mechanism 120, causing the tapered riveting hole 1422 at the lower part of the guide hole to abut against the end of the needle holder 180 on the base 130 to achieve the connection of the needle 190 guide. That is, the distance between the second needle guide pressing mechanism and the second base 1302 is reduced from the distance between the first needle guide press and the first base. The second needle guide pressing mechanism is located at the lower position in the rotary lifting mechanism 120.

[0063] The needle feeding mechanism 400 corresponding to the third station is set on the frame 100 outside the rotary table 110 corresponding to the third base 1303. The needle feeding mechanism 400 includes a first support, on which a first support plate is provided. The first support plate is provided with a needle material groove, which is W-shaped. A roller is provided at each of the two bottoms of the W-shaped groove. A set of grooves arranged in a ring array on the outer circumference of each of the two rollers is provided for accommodating needles. The first support plate is provided with through grooves corresponding to the two rollers. A variable frequency motor is provided on the first support plate at the end of each roller away from the center of the rotary table 110. Each variable frequency motor A set of transmission gears is connected to one end of the corresponding roller shaft. A needle guide plate is provided below the first support plate. The needle guide plate is provided with guide grooves that correspond one-to-one with the through grooves on the first support plate. The outlet of the guide groove is connected to the through hole of the upper connecting plate 121 corresponding to the third needle guide pressing mechanism of the third station. When the needles 190 accumulate in the needle material groove, the needles close to the groove of the roller shaft fall into the groove and move to the top of the through groove of the first support plate with the rotation of the roller shaft. Then, they fall from the through groove of the support plate into the guide groove. In the guide groove, the needle changes from a horizontal state to a vertical state and is inserted into the needle seat through the needle guide pressing mechanism.

[0064] In another embodiment, the needle feeding mechanism 400 includes two pairs of vertically arranged conveyor belts, each conveyor belt having a vertically arranged semi-circular groove. A feed channel plate is located below the two pairs of conveyor belts, with one end of the feed channel plate positioned above a third base. The feed channel plate has two U-shaped feed channels, and a baffle plate is located at the end of the feed channel plate. The baffle plate has a vertical groove, the bottom of which penetrates the feed channel plate and aligns with the third base. The needle is placed vertically between the pair of vertically arranged conveyor belts and moves along the feed channel towards the baffle plate, then falls directly from the baffle plate onto the needle holder 180 of the third base 1303.

[0065] like Figure 10As shown, the pressing mechanism 500 corresponding to the fourth station is set on the frame 100 outside the rotary table 110 between the fifth base 1305 and the sixth base 1306. The pressing mechanism 500 includes a second support 503. The second support 503 is provided with two electric cylinders 501, which are correspondingly set with the adjacent fifth base 1305 and sixth base 1306. Each electric cylinder 501 is provided with a matching servo motor 502 on one side of the second support 503. In this embodiment, a parallel electric cylinder 501 is used. The electric cylinder 501 is mainly composed of a motor and a nut and screw mechanism. The servo motor 502 is connected to the screw through a transmission gear. The screw is provided with a sleeve nut. The nut moves linearly along the screw to press against the needle guide pressing mechanism 140, so as to realize the riveting of the needle 180 and the needle seat 190.

[0066] Specifically, the pressing mechanism 500 includes two electric cylinders 501, one of which is correspondingly set to the fifth base 1305 and the other is correspondingly set to the sixth base 1306. This arrangement is mainly due to space and production capacity requirements, which allows for sufficient space for the two electric cylinders 501 and improves production efficiency.

[0067] Of course, a hydraulic cylinder or a pneumatic cylinder can be used instead of an electric cylinder 501 as a pressing mechanism 500. However, the electric cylinder 501 has high positioning accuracy, high reliability and safety, and fast response. Since the riveting of the needle 190 and the needle seat 180 only requires a small amount of downward pressure, the electric cylinder 501 can better meet the assembly requirements of the needle 190 and the needle seat 180.

[0068] At the fifth station, the fifth needle guide pressing mechanism corresponding to the fifth base 1305 and the sixth needle guide pressing mechanism corresponding to the sixth base 1306 fall back along the rotary lifting mechanism 1120, and the fifth needle guide pressing mechanism and the sixth needle guide pressing mechanism are located at the low position in the rotary lifting mechanism 120; the conical riveting hole 1422 of the pressing head 142 abuts against the upper end of the needle seat 180. The upper end of the needle seat 180 is an annular step before riveting. Pressure is applied to the upper connecting plate 121 above the fifth needle guide pressing mechanism or the sixth needle guide pressing mechanism by the electric cylinder 501, so that the fifth pressing head or the sixth pressing head presses down and deforms the annular step of the needle seat 180 into a conical step, thereby riveting the needle 190 and the needle seat 180 together to form an injection needle. When the needle 190 and the needle seat 180 are riveted together... The required downward pressure is less than 0.5 mm, which can be controlled by the rotary lifting mechanism 120. That is, when the pressure head 142 of the fifth needle guide pressing mechanism or the sixth needle guide pressing mechanism presses against the upper end of the needle seat 180, the corresponding lower end bearing 125 in the rotary lifting mechanism 120 and the cam surface of the rotary cam 126 have a gap of 0.5 mm. In this way, when the electric cylinder 501 is working, the needle guide pressing mechanism 140 has a certain downward pressure space. However, due to the connection method between the needle guide pressing mechanism 140 and the rotary disk 110, the rotary disk 110 may also be subjected to force. Therefore, a support bearing 504 is provided on the second support 503 directly below the rotary disk 110 corresponding to each electric cylinder 501. The support bearing 504 is in contact with the lower end of the fifth base 1305 or the sixth base 1306.

[0069] like Figure 6 As shown, the needle holder and needle head positioning mechanism 600 corresponding to the fifth station is set on the frame 110 outside the rotary table 110 corresponding to the seventh base 1307. The needle holder and needle head positioning mechanism 600 includes two cylinder supports 602, and each cylinder support 602 is provided with a third cylinder 601. The piston rod end of the third cylinder 601 is provided with a push head 603. After the needle head and needle seat are riveted by the pressing mechanism 500, the needle seat 180 and the pressing head 142 are more tightly connected. However, in order to facilitate the unloading of the riveted needle head and needle seat, the needle head guiding pressing mechanism 14 is required. As the rotary lifting mechanism 120 is lifted upward, the needle guide pressing mechanism 140 disengages from the needle 190. However, since the needle seat 180 and the pressing head 142 are in an interference fit state when the needle seat 180 and the needle 190 are pressed together, the needle guide pressing mechanism 140 may cause the needle seat 180 to detach from the base 130 when it is lifted upward with the rotary lifting mechanism 120. Therefore, the needle seat and needle positioning mechanism 600 presses against the needle seat 180 from the side, so that the needle guide pressing mechanism 140 rises with the rotary lifting mechanism 120 and disengages from the needle seat 180.

[0070] like Figure 11-12 As shown, the unloading mechanism 700 corresponding to the sixth station is mounted on the frame 100 outside the rotary table 110 corresponding to the ninth base 1309. The unloading mechanism 700 includes a second support column 708 disposed between the eighth base 1308 and the ninth base 1309, and a third support 706 disposed on the second support column 708. A first linear guide rail 707 extending radially outward along the rotary table 110 is disposed on the third support 706. A horizontal cylinder 701 is disposed on the second support 706 on the side of the first linear guide rail 707 near the eighth base 1309. A first slider 702 with sliding engagement is disposed on the first linear guide rail 707. The piston rod of 701 is connected to the first slider 702. The first slider 702 is provided with a vertical plate 709. The vertical plate 709 is provided with a vertically arranged second linear guide rail 704. The upper end of the second linear guide rail 709 is provided with a vertical cylinder 703. The second linear guide rail 709 is provided with a slidingly engaged second slider 710. The piston rod of the vertical cylinder 703 is connected to the second slider 710. The second slider 710 is provided with a right-angle bracket 705. The right-angle bracket 705 is provided with a pair of finger-clamping cylinders 711 that correspond one-to-one with the ninth base 1309. The frame below the pair of finger-clamping cylinders 711 is provided with a hopper 712.

[0071] At the sixth station, the needle guide pressing mechanism 140 has completely disengaged from the needle holder and needle, leaving the riveted needle holder exposed on the ninth base 1309. The horizontal cylinder 701 drives the first slider 702 to move along the first linear guide 707 towards the center of the rotary table 110, bringing the finger-clamping cylinder closer to the needle holder. Then, the finger-clamping cylinder clamps the needle holder. Then, the vertical cylinder 703 drives the second slider 710 to lift upwards along the second linear guide 704, driving the needle holder 180 to disengage from the ninth base 1309. Then, the horizontal cylinder 701 drives the first slider 702 to move in the opposite direction along the first linear guide 707, moving the needle holder 180 onto the hopper 712. Then, the finger cylinder 711 opens, and the riveted needle holder automatically falls in.

[0072] In another embodiment, the feeding mechanism 700 corresponding to the ninth station can also use a robotic arm with a finger-clamping cylinder 711 to feed the needle. The robotic arm takes the needle from the ninth base 1309 on the needle seat. The robotic arm moves the finger-clamping cylinder 711 above the hopper, and then the finger-clamping cylinder 711 opens the needle seat and automatically falls into the hopper.

[0073] In one embodiment, the detection mechanism 800 corresponding to the seventh station is set on the frame 100 outside the rotary table 110 corresponding to the tenth base 1310. The detection mechanism 800 includes a second support rod 801 corresponding to the base. A third sensor 802 is provided on the second support rod 801. The third sensor 802 determines whether the tenth base 1310 is empty and feeds the information back to the controller 900. Then the controller 900 controls the action of the needle seat feeding mechanism 200. The tenth base 1310 corresponding to the seventh station can also be a transition base.

[0074] Assembly method of needle hub and needle tip:

[0075] S1: The needle holder 180 is installed on the base 130 by the needle holder feeding mechanism 200 at a certain rhythm;

[0076] S2: Detect whether there is a needle holder 180 on the base 130 and feed the information back to the controller 900, while connecting the needle guide pressing mechanism 140 with the needle holder 180;

[0077] S3: Control the needle feeding mechanism 400 through the controller 900 to install the needle 190 on the needle holder 180 through the needle feeding mechanism 400 and the needle guide pressing mechanism 140;

[0078] S4: The controller 900 controls the pressing mechanism 500 to rivet the needle 190 and the needle seat 180 on the base 130 having the needle 190 and the needle seat 180 through the needle guide pressing mechanism 140.

[0079] S5: The needle holder and needle positioning mechanism 600 is controlled by the controller 900 to restrict the riveted needle holder and needle on the base 130, so that the needle guide pressing mechanism 140 is disengaged from the needle holder 180.

[0080] S6: The feeding mechanism 700 is controlled by the controller 900 to move the needle holder and needle from the base 130 to the hopper 712 on the base 180 with the riveted needle.

[0081] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A machine for assembling a needle hub and a needle tip, characterized in that, include: A frame, used to mount the prime mover and actuator; Rotary components are used to realize the intermittent movement of several needle holders and needles, and cooperate with the actuator to realize the various assembly steps in the process of riveting the needle holders and needles. The driving device drives the rotating component to perform intermittent motion; Several bases, serving as carriers for needle holders, are arranged in a ring on the rotating component to transfer the needle holders according to the needle holder and needle head riveting steps; Several needle guide pressing mechanisms are one-to-one with the base and are floatingly mounted on the rotating part through a rotary lifting mechanism to realize the steps of guiding the needle to the needle seat and riveting the needle seat and the needle. The frame is also provided with a needle seat feeding mechanism, a needle head feeding mechanism, a pressing mechanism, a feeding mechanism, and a controller, which are arranged sequentially around the outside of the rotating part. The needle holder feeding mechanism installs the needle holders on the base in an intermittent rhythm; The needle holder feeding mechanism includes a vibratory feeder. The output end of the vibratory feeder is equipped with a flat vibrating table. The discharge end of the flat vibrating table is equipped with a dropping plate. The dropping plate is equipped with a dropping groove that is offset from the discharge end along the tangent direction of the rotary table. A pusher plate is provided above the dropping groove. The pusher plate is equipped with material grooves that are correspondingly arranged to the two discharge ends and communicate with the discharge ends. A first cylinder is provided on the dropping plate at one end of the pusher plate along the tangent direction of the rotary table. The piston rod of the first cylinder is connected to the pusher plate. The needle holder enters the material groove of the pusher plate from the discharge end of the flat vibrating table. Then, the first cylinder pushes the needle holder along the tangent direction of the rotary table to move it into the dropping groove above the dropping plate. Finally, the needle holder falls directly into the first base from the dropping groove. The needle feeding mechanism installs the needles on the needle holder in an intermittent rhythm; The pressing mechanism, according to an intermittent rhythm, rivets the needle seat and the needle head together through the needle-guided pressing mechanism; The feeding mechanism, in an intermittent rhythm, removes the riveted needle and needle seat from the base and places them into the hopper; The controller receives feedback information and issues action commands to the prime mover and the actuator. The needle guide pressing mechanism includes a guide seat, on which a pressing head is provided through the guide seat. The pressing head has a through guide hole, with a tapered receiving hole at the upper end and a tapered riveting hole at the lower part. The needle enters the guide hole through the tapered receiving hole and is inserted into the needle holder along the guide hole. The upper part of the base has a conical tip, and the needle seat is fitted on the tip to achieve needle seat centering; the middle part of the base has a ring platform, and after the needle seat is fitted on the tip, the bottom of the needle seat abuts against the ring platform.

2. The assembly machine for a needle hub and a needle tip according to claim 1, characterized in that, A needle seat detection mechanism is also provided on the frame between the needle seat feeding mechanism and the needle head feeding mechanism.

3. The assembly machine for a needle hub and a needle tip according to claim 1 or 2, characterized in that, A needle seat and needle positioning mechanism is also provided on the frame between the pressing mechanism and the feeding mechanism.

4. The assembly machine for a needle hub and a needle tip according to claim 2, characterized in that, The needle seat detection mechanism includes a first support rod corresponding to the base. A second sensor is provided on the first support rod. The second sensor determines whether there is a needle seat on the base and feeds the information back to the controller. The controller then controls the actions of the needle feeding mechanism and the pressing mechanism.

5. The assembly machine for a needle hub and a needle tip according to claim 3, characterized in that, The needle holder and needle positioning mechanism includes a cylinder bracket corresponding to the base, a third cylinder on the cylinder bracket, and a pusher at the end of the piston rod of the third cylinder.

6. The assembly machine for a needle hub and a needle tip according to claim 1, characterized in that, The pressing mechanism includes a second support corresponding to the base. The second support is equipped with an electric cylinder, and a matching servo motor is provided on the second support on one side of the electric cylinder. The electric cylinder mainly consists of a motor and a nut and screw mechanism. The servo motor is connected to the screw through a transmission gear. The screw is equipped with a sleeve-type nut. The nut moves linearly along the screw to press against the needle guide pressing mechanism, thereby achieving the riveting of the needle and the needle seat.

7. The assembly machine for a needle hub and a needle tip according to claim 6, characterized in that, A support bearing is provided on the frame directly below the rotating part corresponding to the electric cylinder, which abuts against the base.

8. The assembly machine for a needle hub and a needle tip according to claim 1, characterized in that, The rotary lifting mechanism includes linear bearing groups corresponding to the number of bases. Each linear bearing group is correspondingly set with one needle guide pressing mechanism. Each linear bearing group is radially arranged on the side of the needle guide pressing mechanism near the center of the rotary component. Each linear bearing group includes two linear bearings, each linear bearing is vertically arranged through the rotary disk, and each linear bearing has a guide shaft. The upper ends of the two guide shafts in a set of linear bearings are provided with upper connecting plates. The needle guide pressing mechanism is suspended on the upper connecting plates. The lower ends of the two guide shafts in a set of linear bearings are provided with lower connecting plates. The lower connecting plate has a bearing perpendicular to the radial direction of the rotary component and vertically arranged at one end near the center of the rotary component. A rotary cam is provided on the frame below several bearings. The rotary cam has a cam surface that matches the entire riveting process. Several bearings abut against the cam surface of the rotary cam and rotate and lift, thereby driving the needle guide pressing mechanism to lift up and down.

9. A method for assembling a needle hub and a needle tip, characterized in that, The needle holder and needle tip are assembled using an assembly machine for assembling a needle holder and a needle tip as described in any one of claims 1-8. Includes the following steps: S1: The needle holder is installed on the base by the needle holder feeding mechanism at a certain rhythm; S2: The needle feeding mechanism is controlled by the controller to install the needle on the needle seat through the needle feeding mechanism and the needle guide pressing mechanism, wherein the needle enters the guide hole through the tapered receiving hole of the needle guide pressing mechanism; S3: The controller controls the pressing mechanism to rivet the needle and the needle seat on the base having the needle and the needle seat using the tapered riveting hole of the needle guiding pressing mechanism. S4: The feeding mechanism is controlled by the controller to move the needle head and needle seat from the base to the hopper on the base with the riveted needle head and needle seat.

10. The method for assembling a needle hub and a needle tip according to claim 9, characterized in that, Between steps S1 and S2, the needle seat detection mechanism detects whether there is a needle seat on the base and feeds the information back to the controller, while simultaneously connecting the needle guide pressing mechanism to the needle seat.

11. The method for assembling a needle hub and a needle tip according to claim 10, characterized in that, Between steps S3 and S4, the needle head positioning mechanism restricts the riveted needle head to the base, thereby disengaging the needle head guiding and pressing mechanism from the needle head.

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