Equipment and method for assembling screw rod piston group of liquid injection pump for microfluidic system

Abstract

The invention relates to assembling equipment for a screw rod piston group of a liquid injection pump for a microfluidic system, which comprises a rotating assembly, a turntable, a guide sleeve providing assembly, a screw rod providing assembly, a screw rod pressing assembly, a piston rod providing assembly, a piston rod fastening assembly and a control system, wherein the guide sleeve providing assembly is used for providing a guide sleeve and placing the guide sleeve on a fixing clamp of a turntable, the screw rod providing assembly is used for providing a screw rod and inserting the screw rod into the guide sleeve, the piston rod fastening assembly is used for assembling the screw rod and the guide sleeve together, and the piston rod providing assembly is used for inserting a piston rod into the guide sleeve. The piston rod fastening assembly is used for enabling the screw rod to rotate relative to the piston rod, so that the screw rod and the piston rod are screwed tightly, automatic assembly is achieved, and the final position of the piston rod is accurate. In addition, the invention further provides an assembling method of the screw rod piston set.

Description

Technical Field

[0001] The present disclosure relates to the field of biochemical analysis equipment, and in particular to an assembly device and method for a screw rod piston assembly of an injection pump for a microfluidic system. Background Art

[0002] Microfluidics uses microchannels to process or manipulate tiny fluids. Microfluidics enables a range of micromachining and micromanipulation techniques that are difficult to accomplish with conventional methods. Currently, microfluidic chips are widely used in technologies such as digital PCR and gene sequencing. The injection pump (syringe pump) in a microfluidic system is a crucial device for injecting or extracting liquid samples. The pump's drive mechanism is a key factor directly affecting injection and extraction pressures, as well as delivery accuracy.

[0003] Chinese patent application 202010097159.5 discloses a microfluidic system infusion pump drive device, which, together with a supporting device, forms an infusion pump for a microfluidic system. The supporting device comprises a piston rod 502, an internally threaded nut 503 (also known as a screw rod), and a guide sleeve 504. The internally threaded nut 503 is mounted within the guide sleeve 504, and the piston rod 502 is externally threaded and movably connected to the nut 503. The piston rod 502, internally threaded nut 503, and guide sleeve 504 are assembled into a screw-rod-piston assembly, which is then placed into a housing 505.

[0004] Conventional assembly of a screw-rod-piston assembly is typically performed manually. This involves first placing the screw rod and guide sleeve into a specialized fixture and pressing them together using a press. The piston rod 502 is then manually screwed into the screw rod. Manual assembly is inefficient, and the final position of the piston rod 502 cannot be accurately determined. Summary of the Invention

[0005] Based on this, it is necessary to address the problems of low assembly efficiency and inaccurate positioning of the piston rod in a screw plug rod piston assembly, and propose an assembly device for a screw plug rod piston assembly of an injection pump for a microfluidic system. Also proposed is an assembly method for a screw plug rod piston assembly.

[0006] ] a guide sleeve, a screw rod and a piston rod, the guide sleeve being arranged at the top end and the guide sleeve being arranged at the bottom end of the rotary table, the guide sleeve being arranged at the top end and the piston rod being arranged at the bottom end of the rotary table; the guide sleeve providing assembly, the screw rod providing assembly, the screw rod pressing assembly, the piston rod providing assembly and the piston rod fastening assembly being arranged at intervals along the circumference of the rotary table; the guide sleeve providing assembly comprising a guide sleeve conveying mechanism and a guide sleeve picking and placing mechanism, the guide sleeve conveying mechanism being configured to convey the guide sleeve toward the rotary table in a radial direction of the rotary table, the guide sleeve picking and placing mechanism being configured to pick up the guide sleeve conveyed by the guide sleeve conveying mechanism and place it on the fixing fixture; the screw rod providing assembly comprising a screw rod conveying mechanism and a screw rod picking and placing mechanism, the screw rod conveying mechanism being configured to convey the guide sleeve toward the rotary table in a radial direction of the rotary table The disc conveys a screw rod, and the screw rod picking and placing mechanism is used to pick up the screw rod conveyed by the screw rod conveying mechanism and insert the screw rod into the guide sleeve from top to bottom; the screw rod pressing assembly is used to press the screw rod downward so that the screw rod and the guide sleeve are assembled together; the piston rod providing assembly includes a piston rod conveying mechanism and a piston rod picking and placing mechanism, the piston rod conveying mechanism is configured to convey the piston rod toward the turntable along the radial direction of the turntable, the piston rod picking and placing mechanism is used to pick up the piston rod conveyed by the piston rod conveying mechanism and insert the piston rod into the guide sleeve from bottom to top; the piston rod fastening assembly is located above the turntable and is configured to be able to mate with the screw rod to drive the screw rod to rotate relative to the piston rod, so that the screw rod and the piston rod are tightened to obtain the screw rod piston group; it also includes: a control system, which is used to control the operation of the rotating assembly, the guide sleeve providing assembly, the screw rod providing assembly, the screw rod pressing assembly, the piston rod providing assembly and the piston rod fastening assembly.

[0007] In some embodiments, the guide sleeve conveying mechanism includes: a first vibration plate, a first conveying track docked with the first vibration plate, a first cache position, and a first transverse drive cylinder, wherein the first cache position is connected to the end of the first conveying track, and the first transverse drive cylinder is used to push the guide sleeve on the first conveying track to the first cache position; the guide sleeve picking and placing mechanism includes: a first picking cylinder, a first clamping jaw controlled by the first picking cylinder, a first lifting cylinder, a first radial adjustment member, and a first support structure, the first clamping jaw clamps or releases the guide sleeve under the control of the first picking cylinder, the first lifting cylinder is provided on the first support structure to drive the first picking cylinder and the first clamping jaw to lift and lower, and the first radial adjustment member is movably provided on the first support structure to drive the first picking cylinder and the first clamping jaw to move radially along the turntable.

[0008] In some embodiments, the screw rod conveying mechanism includes: a second vibration plate, a second conveying track docked with the second vibration plate, a second cache position, and a second transverse drive cylinder, wherein the second cache position is connected to the end of the second conveying track, and the second transverse drive cylinder is used to push the screw rod on the second conveying track to the second cache position; the screw rod picking and placing mechanism includes: a second picking cylinder, a second clamp controlled by the second picking cylinder, a second lifting cylinder, a second radial adjustment member, and a second support structure, the second clamp clamps or releases the screw rod under the control of the second picking cylinder, the second lifting cylinder is provided on the second support structure to drive the second picking cylinder and the second clamp to lift and lower, and the second radial adjustment member is movably provided on the second support structure to drive the second picking cylinder and the second clamp to move radially along the turntable.

[0009] In some embodiments, the screw rod pressing assembly includes a pressing cylinder located above the turntable, and the pressing cylinder has a retractable output end.

[0010] In some embodiments, the piston rod conveying mechanism includes: a third vibration plate, and a third conveying track connected to the third vibration plate; the piston rod picking and placing mechanism includes: a lifting cylinder and a material receiving part, the material receiving part is located below the turntable and docked with the end of the third conveying track, the material receiving part is used to receive the piston rod from the third conveying track, and the lifting cylinder is used to drive the material receiving part to rise and fall.

[0011] In some embodiments, the piston rod fastening assembly includes a first lifting assembly and a tightening motor connected to an output end of the first lifting assembly, wherein the output end of the tightening motor is used to drive the screw rod to rotate relative to the piston rod.

[0012] In some embodiments, a torque testing assembly is further included, which is located between the piston rod fastening assembly and the guide sleeve providing assembly; the torque testing assembly includes a second lifting assembly and a torque testing machine connected to the output end of the second lifting assembly, the second lifting assembly is used to drive the torque testing machine to rise and fall along the axial direction of the turntable, and the torque testing machine is used to test the screwing torque between the screw rod and the piston rod.

[0013] In some embodiments, a discharging assembly is further included, which is located between the guide sleeve providing assembly and the piston rod fastening assembly. The discharging assembly includes: a discharging track and a finished product picking and placing mechanism. The discharging track is provided on one side of the turntable, and the finished product picking and placing mechanism is used to transfer the screw rod piston group on the turntable to the discharging track.

[0014] In some embodiments, the discharge track is tilted relative to the axial direction of the turntable.

[0015] and a control unit for adjusting the position of the guide sleeve and the piston rod and the piston rod respectively. The control unit for adjusting the position of the guide sleeve and the piston rod respectively move the piston rods to the guide sleeve and the piston rod respectively move the piston rods to the guide sleeve. The control unit for adjusting the position of the guide sleeve and the piston rod respectively move the piston rods to the guide sleeve and the piston rod respectively move the piston rods to the guide sleeve.

[0016] In the present disclosure, when assembling a screw rod-piston assembly, a guide sleeve providing assembly is used to place the guide sleeve onto a fixing fixture. The screw rod providing assembly is then used to pre-assemble the screw rod and the guide sleeve. The screw rod pressing assembly is then used to mate the screw rod and the guide sleeve. Finally, the piston rod providing assembly is used to insert the piston rod from bottom to top into the guide sleeve. The piston rod fastening assembly is then used to rotate the screw rod, allowing the screw rod and piston rod threads to engage, thereby forming the screw rod-piston assembly. This achieves automated assembly, and the final position of the screw rod is controllable, ensuring the accuracy of the final position. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is an exploded view of the screw piston assembly of the injection pump for the microfluidic system according to an embodiment of the present disclosure.

[0018] Figure 2 for Figure 1 The assembly diagram of the screw rod piston group is shown.

[0019] Figure 3 It is a structural schematic diagram of an assembly device for a screw rod piston group of an injection pump for a microfluidic system according to an embodiment of the present disclosure.

[0020] Figure 4 and Figure 5 It is a structural schematic diagram of the assembly equipment of the screw rod piston group of the injection pump for the microfluidic system according to the embodiment of the present disclosure from different perspectives, in which the protective cover is hidden.

[0021] Figure 6 A structural schematic diagram of the components of the guide sleeve of an embodiment of the present disclosure is provided.

[0022] Figure 7 A schematic structural diagram of the screw rod assembly is provided for an embodiment of the present disclosure.

[0023] Figure 8 A schematic structural diagram of a piston rod providing assembly and a piston rod fastening assembly according to an embodiment of the present disclosure.

[0024] Reference numerals:

[0025] 100. Screw rod and piston assembly; 110. Guide sleeve; 120. Screw rod; 130. Piston rod; 1. Machine platform; 11. Table; 12. Protective cover; 2. Rotating assembly; 3. Turntable; 31. Center hole; 32. Fixing fixture; 321. Positioning hole; 4. Guide sleeve providing assembly; 41. Guide sleeve conveying mechanism; 411. First vibrating disk; 412. First conveying track; 413. First cache position; 4131. Positioning groove; 4132. Stop block; 414. First transverse driving cylinder; 42. Guide sleeve picking and placing mechanism; 421. First picking cylinder; 422. First clamp; 423. First lifting cylinder; 424. First radial adjustment member; 425. First supporting structure; 5. Screw rod providing assembly; 51. Screw rod conveying mechanism; 511. Second vibrating disk; 512. Second conveying track ;513, second cache position;5131, groove;5132, limit block;514, second lateral drive cylinder;52, screw rod pick-up and placement mechanism;521, second picking cylinder;522, second clamping claw;523, second lifting cylinder;524, second radial adjustment member;525, second supporting structure;6, screw rod pressing assembly;61, pressing cylinder;7, piston rod providing assembly;71, piston rod conveying mechanism;711, third vibration plate;712, third conveying track;72, piston rod pick-up and placement mechanism;721, lifting cylinder;722, material receiving part;8, piston rod fastening assembly;81, first lifting assembly;82, tightening motor;9, torque testing assembly;91, second lifting assembly;92, torque testing machine;10, discharge assembly;101, discharge track;102, finished product pick-up and placement mechanism. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present disclosure more clearly understood, specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below.

[0027] In the description of the present disclosure, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0028] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this disclosure, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly or specifically limited.

[0029] An embodiment of one aspect of the present disclosure provides an assembly device for a screw rod piston assembly 100 of an injection pump for a microfluidic system, wherein Figure 1 and Figure 2 The screw piston assembly 100 is shown in a disassembled state and an assembled state respectively.

[0030] The screw-piston assembly 100 includes a guide sleeve 110, a screw 120, and a piston rod 130. In the assembled state, the guide sleeve 110 is fixedly mounted on the outside of the screw 120. One end of the piston rod 130 extends into the guide sleeve 110 and is threadedly connected to the screw 120. Specific application scenarios of the screw-piston assembly 100 can be found in the background information and will not be elaborated here.

[0031] The following describes the embodiments of the assembly device and assembly method disclosed herein with reference to the accompanying drawings.

[0032] refer to Figures 3 to 8 The assembly equipment for a screw-piston assembly 100 for an injection pump for a microfluidic system according to one embodiment of the present disclosure includes a machine 1, a rotating assembly 2, a turntable 3, a guide sleeve providing assembly 4, a screw providing assembly 5, a screw pressing assembly 6, a piston rod providing assembly 7, a piston rod fastening assembly 8, and a control system. In the present disclosure, the control system is located within the machine 1, while the other components are entirely or partially located on the table 11 of the machine 1. The various components of the assembly equipment can be installed on other supporting foundations, such as a workshop floor.

[0033] The rotating assembly 2 is disposed on the table 11 of the machine 1. The rotating assembly 2 has a rotating shaft (not numbered). The power source of the rotating assembly 2 can be a motor.

[0034] The turntable 3 is connected to the rotating shaft of the rotating assembly 2 and can rotate around its own central axis when driven by the rotating assembly 2. Specifically, the turntable 3 is located above the rotating assembly 2. A center hole 31 is provided in the center of the turntable 3. The center hole 31 is coaxially connected to the rotating shaft of the rotating assembly 2. Figure 3 , the rotating component 2 can drive the turntable 3 to rotate in the clockwise direction.

[0035] The upper surface of the turntable 3 is provided with a plurality of fixing fixtures 32 spaced evenly along the circumference. The fixing fixtures 32 are used to position the guide sleeve 110. For example, the fixing fixtures 32 are provided with positioning holes 321 that extend through the fixing blocks. The positioning holes 321 are used to receive and position the guide sleeve 110. As will be readily understood, the radial cross-sectional profile of the positioning holes 321 corresponds to the radial cross-sectional profile of the guide sleeve 110. The turntable 3 is also provided with through-holes (not shown) that correspond axially to the positioning holes 321 of the fixing blocks. The turntable 3 axially extends through the location where the fixing fixtures 32 are provided.

[0036] Further, refer to Figure 4 and Figure 5 The assembly equipment further includes a torque test assembly 9 and a discharging assembly 10. The guide sleeve provides an assembly 4, a screw rod provides an assembly 5, a screw rod pressing assembly 6, a piston rod provides an assembly 7 and a piston rod fastening assembly 8. The torque test assembly 9 and the discharging assembly 10 are sequentially spaced along the circumference of the turntable 3. In the embodiment of the present disclosure, reference is made to Figure 3 and Figure 4 When the turntable 3 rotates clockwise, it drives the fixing fixtures 32 to rotate in sequence to correspond to the guide sleeve providing assembly 4, the screw rod providing assembly 5, the screw rod pressing assembly 6, the piston rod providing assembly 7, the piston rod fastening assembly 8, the torque testing assembly 9, and the discharge assembly 10. In other words, each fixing fixture 32 can be rotated in sequence to the processing position defined by the above components.

[0037] refer to Figures 4 to 6 The guide sleeve providing assembly 4 includes a guide sleeve conveying mechanism 41 and a guide sleeve picking and placing mechanism 42. The guide sleeve conveying mechanism 41 is configured to convey the guide sleeve 110 toward the turntable 3 along the radial direction of the turntable 3, and the guide sleeve picking and placing mechanism 42 is configured to pick up the guide sleeve 110 conveyed by the guide sleeve conveying mechanism 41 and place it on the fixing fixture 32.

[0038] In a specific configuration, the end of the guide sleeve conveying mechanism 41 is located above the turntable 3 , so that the guide sleeve picking and placing mechanism 42 can quickly place the guide sleeve 110 on the fixing fixture 32 after picking up the guide sleeve 110 .

[0039] refer to Figure 4 、 Figure 5 and Figure 7 The screw rod supply assembly 5 includes a screw rod conveying mechanism 51 and a screw rod picking and placing mechanism 52. The screw rod conveying mechanism 51 is configured to convey the screw rod 120 toward the turntable 3 in a radial direction of the turntable 3. The screw rod picking and placing mechanism 52 is configured to pick up the screw rod 120 conveyed by the screw rod conveying mechanism 51 and insert the screw rod 120 from top to bottom into the guide sleeve 110. After the screw rod picking and placing mechanism 52 picks up the screw rod 120, it inserts the screw rod 120 into the guide sleeve 110. At this time, the screw rod 120 and the guide sleeve 110 are loosely fitted.

[0040] The screw rod pressing assembly 6 is used to press the screw rod 120 downwards so that the screw rod 120 is assembled with the guide sleeve 110. The screw rod pressing assembly 6 is used to make the screw rod 120 and the guide sleeve 110 fit together.

[0041] refer to Figure 4 、 Figure 5 and Figure 8 The piston rod supply assembly 7 includes a piston rod conveying mechanism 71 and a piston rod picking and placing mechanism 72. The piston rod conveying mechanism 71 is configured to convey the piston rod 130 toward the turntable 3 along the radial direction of the turntable 3, and the piston rod picking and placing mechanism 72 is configured to pick up the piston rod 130 conveyed by the piston rod conveying mechanism 71 and insert the piston rod 130 from bottom to top into the guide sleeve 110.

[0042] The piston rod fastening assembly 8 is located above the turntable 3 and is configured to be able to move downward to mate with the screw rod 120 to drive the screw rod 120 to rotate relative to the piston rod 130, so that the screw rod 120 and the piston rod 130 are tightened to obtain the screw rod piston assembly 100.

[0043] The control system is used to control the operation of the rotating assembly 2, the guide sleeve providing assembly 4, the screw rod providing assembly 5, the screw rod pressing assembly 6, the piston rod providing assembly 7, and the piston rod fastening assembly 8. The specific type of the control system is not limited. It has a built-in control program that enables each component to operate as required, thereby achieving continuous assembly of multiple screw rod piston assemblies 100.

[0044] The assembly equipment of the screw rod piston group 100 of the injection pump for the microfluidic system can realize the automatic assembly of the screw rod piston group 100, thereby improving the assembly efficiency and assembly accuracy. Specifically, the guide sleeve 110 is placed on the fixing fixture 32 using the guide sleeve providing component 4, and then the screw rod providing component 5 is used to pre-assemble the screw rod 120 and the guide sleeve 110 together, and then the screw rod pressing component 6 is used to match the screw rod 120 and the guide sleeve 110 together. Finally, after the piston rod providing component 7 is used to insert the piston rod 130 from bottom to top into the guide sleeve 110, the piston rod fastening component 8 is used to drive the screw rod 120 to rotate, so that the screw rod 120 and the piston rod 130 are threadedly matched, thereby obtaining the screw rod piston group 100, and the final position of the screw rod 120 is controllable, which can ensure the accuracy of the final position.

[0045] For further reference, Figure 4 The assembly equipment also includes a torque testing assembly 9 and a discharging assembly 10. The torque testing assembly 9 can be used to test the screwing torque and smoothness of the screw rod 120 and piston rod 130 in the screw rod-piston assembly 100. If unqualified products are found, the machine can be shut down and the unqualified products removed. The discharging assembly 10 can be used to promptly remove qualified screw rod-piston assemblies 100.

[0046] In some embodiments, reference Figure 5 and Figure 6 The guide sleeve conveying mechanism 41 includes: a first vibration disk 411, a first conveying track 412 connected to the first vibration disk 411, a first cache position 413, and a first transverse driving cylinder 414, wherein the first cache position 413 is connected to the end of the first conveying track 412, and the first transverse driving cylinder 414 is used to push the guide sleeve 110 on the first conveying track 412 to the first cache position 413.

[0047] Optionally, a first vibrating plate 411 is disposed on one side of the machine 1. One end of a first conveying track 412 is connected to the output port of the first vibrating plate 411, and the other end (i.e., the terminal end) is located above the turntable 3. The first vibrating plate 411 sequentially conveys multiple guide sleeves 110 toward the turntable 3 via the first conveying track 412. The first buffering position 413 specifically includes a positioning groove 4131 and a stop block 4132 connected to the first conveying track 412. The positioning groove 4131 is used to accommodate the guide sleeve 110, and the stop block 4132 is used to limit the position of the guide sleeve 110. The first transverse drive cylinder 414 is used to push the guide sleeve 110 at the terminal end of the first conveying track 412, thereby moving the guide sleeve 110 into the positioning groove for pickup by the guide sleeve pick-up mechanism 42. The guide sleeve 110 is first transferred from the first conveying track 412 to the first buffering position 413, thereby stabilizing the guide sleeve 110 and ensuring that the guide sleeve pick-up mechanism 42 can quickly grab the guide sleeve 110.

[0048] In some embodiments, the guide sleeve pick-and-place mechanism 42 includes: a first pick-up cylinder 421, a first clamping jaw 422 controlled by the first pick-up cylinder 421, a first lifting cylinder 423, a first radial adjustment member 424, and a first support structure 425. The first clamping jaw 422 clamps or releases the guide sleeve 110 under the control of the first pick-up cylinder 421, and the first lifting cylinder 423 drives the first pick-up cylinder 421 and the first clamping jaw 422 to move upward and downward. The first radial adjustment member 424 is movably disposed on the first support structure 425 and is used to drive the first pick-up cylinder 421 and the first clamping jaw 422 to move radially along the turntable 3. Exemplarily, the first radial adjustment member 424 is screw-fitted to the first support structure 425, and the first pick-up cylinder 421 and the first clamping jaw 422 are both movably mounted on the first support structure 425 via an intermediate element and connected to the first radial adjustment member 424.

[0049] The first radial adjustment member 424 drives the first picking cylinder 421 and the first clamping jaw 422 to move radially along the turntable 3 , so that the first clamping jaw 422 can move to a position capable of picking up the guide sleeve 110 , and then move to a position corresponding to the fixing fixture 32 .

[0050] In some embodiments, reference Figure 5 and Figure 7 The screw rod conveying mechanism 51 includes: a second vibrating plate 511, a second conveying track 512 connected to the second vibrating plate 511, a second buffer position 513, and a second transverse driving cylinder 514. The second buffer position 513 is connected to the end of the second conveying track 512. The second transverse driving cylinder 514 is used to push the screw rod 120 on the second conveying track 512 to the second buffer position 513. The screw rod 120 is first transferred from the second conveying track 512 to the second buffer position 513 to stabilize the screw rod 120, thereby ensuring that the screw rod pick-up and placement mechanism 52 can quickly grasp the screw rod 120.

[0051] Optionally, the second vibration disk 511 is arranged on one side of the machine 1. One end of the second conveying track 512 is connected to the output port of the second vibration disk 511, and the other end (i.e., the end) is located above the turntable 3. The second vibration disk 511 conveys multiple screw rods 120 toward the turntable 3 in sequence through the second conveying track 512. The second cache position 513 specifically includes a groove 5131 and a limit block 5132 connected to the second conveying track 512, the groove 5131 is used to accommodate the screw rod 120, and the limit block 5132 is used to limit the screw rod 120. The second transverse drive cylinder 514 is used to push the screw rod 120 at the end of the second conveying track 512 to move, and then move the screw rod 120 to the groove 5131 for the screw rod pick-up and placement mechanism 52 to pick up. In this way, the screw rod pick-up and placement mechanism 52 does not need to adjust its position left and right, thereby improving the picking efficiency.

[0052] In some embodiments, reference Figure 5 and Figure 7 The screw rod picking and placing mechanism 52 includes: a second picking cylinder 521, a second clamping jaw 522 controlled by the second picking cylinder 521, a second lifting cylinder 523, a second radial adjustment member 524, and a second support structure 525. The second clamping jaw 522 clamps or releases the screw rod 120 under the control of the second picking cylinder 521. The second lifting cylinder 523 drives the second picking cylinder 521 and the second clamping jaw 522 to move up and down. The second radial adjustment member 524 is used to drive the second picking cylinder 521 and the second clamping jaw 522 to move radially along the turntable 3. Exemplarily, the second radial adjustment member 524 is screwed together with the second support structure 525, and the second picking cylinder 521 and the second clamping jaw 522 are both movably mounted on the second support structure 525 through an intermediate element and are connected to the second radial adjustment member 524.

[0053] By driving the second picking cylinder 521 and the second clamping jaw 522 to move radially along the turntable 3 through the second radial adjustment member 524, the second clamping jaw 522 can be moved to a position where it can pick up the screw rod 120, and then moved to a position corresponding to the position of the fixing fixture 32, and then the screw rod 120 is placed in the guide sleeve 110 on the fixing fixture 32.

[0054] In some embodiments, reference Figure 5 The screw rod pressing assembly 6 includes a pressing cylinder 61 located above the turntable 3. The pressing cylinder 61 has a retractable output end. When the output end of the pressing cylinder 61 extends toward the turntable 3, it can press the screw rod 120 downward, so that the inserted screw rod 120 is pressed into the guide sleeve 110 and is mated with the guide sleeve 110.

[0055] In some embodiments, reference Figure 5 、 Figure 8 The piston rod conveying mechanism 71 includes: a third vibration plate 711 and a third conveying track 712 connected to the third vibration plate.

[0056] Optionally, a third vibrating plate 711 is disposed on one side of the machine 1. One end of a third conveying track 712 is connected to the output port of the third vibrating plate 711, and the other end (i.e., the terminal end) is located above the turntable 3. The third vibrating plate 711 sequentially conveys the plurality of spiral rods 120 toward the turntable 3 via the third conveying track 712. In the present disclosure, the first vibrating plate 411, the second vibrating plate 511, and the third vibrating plate are located on different sides of the machine 1.

[0057] In some embodiments, the piston rod picking and placing mechanism 72 includes: a lifting cylinder 721 and a material receiving portion 722. The material receiving portion 722 is located below the turntable 3 and docked with the end of the third conveying track 712. The material receiving portion 722 is used to receive the piston rod 130 from the third conveying track 712, and the lifting cylinder 721 is used to drive the material receiving portion 722 to rise and fall.

[0058] Optionally, in the radial direction of the turntable 3, the piston rod pick-up and placement mechanism 72 is located in front of the end of the third conveying track 712. The piston rod 130 maintains its direction of movement when transitioning from the third conveying track 712 to the material receiving portion 722. The cross-sectional shape of the material receiving portion 722 is configured to be consistent with the cross-sectional shape of the third conveying track 712. This allows the piston rod 130 to transition smoothly to the material receiving portion 722.

[0059] When the lifting cylinder 721 drives the material receiving portion 722 to rise, the piston rod 130 on the material receiving portion 722 can pass through the through hole on the turntable 3 and be inserted into the guide sleeve 110. Afterwards, with the cooperation of the piston rod fastening assembly 8, the piston rod 130 and the screw rod 120 are tightened.

[0060] In some embodiments, reference Figure 4 、 Figure 5 、 Figure 8 The piston rod fastening assembly 8 includes a first lifting assembly 81 and a tightening motor 82 connected to the output end of the first lifting assembly 81. The output end of the tightening motor 82 is used to drive the screw rod 120 to rotate relative to the piston rod 130.

[0061] The first lifting assembly 81 is mounted on the table 11 of the machine 1 and is used to drive the tightening motor 82 to move up and down. The output end of the tightening motor 82 is configured to engage with the screw rod 120 to transmit torque, thereby tightening the piston rod 130 and the screw rod 120.

[0062] In some embodiments, reference Figure 4 and Figure 5 The assembly equipment of the screw rod piston group 100 of the injection pump for the microfluidic system also includes a torque testing component 9, which is located between the piston rod fastening component 8 and the guide sleeve providing component 4.

[0063] The torque testing assembly 9 includes a second lifting assembly 91 and a torque testing machine 92 connected to the output end of the second lifting assembly 91. The second lifting assembly 91 is used to drive the torque testing machine 92 to rise and fall along the axial direction of the turntable 3. The torque testing machine 92 is used to test the screw torque between the screw rod 120 and the piston rod 130.

[0064] After the piston rod 130 and the screw assembly are assembled, the torque test assembly 9 is used to test the screwing torque between the piston rod 130 and the screw rod 120 and the smoothness of their relative rotation, thereby screening out qualified assembled products. If unqualified, the control system can issue an alarm and shut down the machine, and then reject the unqualified products.

[0065] In some embodiments, reference Figure 4 and Figure 5 The assembly apparatus for the screw-piston assembly 100 of the microfluidic system injection pump further includes a discharge assembly 10, which is located between the guide sleeve providing assembly 4 and the piston rod fastening assembly 8. When a torque testing assembly 9 is provided, the discharge assembly 10 is more specifically located between the torque testing assembly 9 and the guide sleeve providing assembly 4.

[0066] The discharge assembly 10 includes a discharge track 101 and a finished product placement mechanism 102. The discharge track 101 is located on one side of the turntable 3, and the finished product placement mechanism 102 is used to transfer the screw rod piston assembly 100 on the turntable 3 to the discharge track 101. The finished product placement mechanism 102 is used to pick up qualified screw rod piston assembly 100 from the turntable 3 and place it on the discharge track 101, thereby releasing the fixing fixture 32 to allow it to receive the next guide sleeve 110.

[0067] Optionally, the discharge track 101 is tilted relative to the axial direction of the turntable 3. The discharge track 101 is tilted so that the screw piston assembly 100 can slide down under the action of gravity, thereby reducing energy consumption.

[0068] Optionally, the finished product picking and placing mechanism 102 includes a cylinder and a clamp driven by the cylinder, and the clamp is used to pick up the screw rod piston assembly 100.

[0069] In some embodiments, a protective cover 12 is provided on the table 11 of the machine 1. The protective cover 12 covers the guide sleeve pick-up and placement mechanism 42, the screw rod pick-up and placement mechanism 52, the screw rod pressing assembly 6, the piston rod fastening assembly 8, the torque testing assembly 9, etc., and also covers parts of each conveyor track.

[0070] In another aspect of the present application, a method for assembling a screw-piston assembly 100 of an injection pump for a microfluidic system is provided, which is applied to the above-mentioned assembly equipment. The method comprises the following steps:

[0071] S100 , controlling the guide sleeve conveying mechanism 41 to convey the guide sleeve 110 , and utilizing the guide sleeve taking and placing mechanism 42 to place the guide sleeve 110 on the fixing fixture 32 .

[0072] As described above, the guide sleeve pick-up and placement mechanism 42 picks up the guide sleeve 110 delivered by the guide sleeve pick-up and placement mechanism 42 and places it on the empty fixing fixture 32. It can be understood that when the guide sleeve pick-up and placement mechanism 42 releases the guide sleeve 110, the turntable 3 has already driven the empty fixing fixture 32 to rotate to the bottom of the guide sleeve 110 release fixture.

[0073] S200 , controlling the turntable 3 to rotate until the guide sleeve 110 corresponds to the screw rod conveying mechanism 51 .

[0074] In this step, after the guide sleeve 110 is placed on the fixing fixture 32 , the turntable 3 is controlled to rotate so that the guide sleeve 110 rotates to the position where the screw rod 120 is placed.

[0075] S300 , controlling the screw rod conveying mechanism 51 to convey the screw rod 120 , and controlling the screw rod 120 pick-and-place machine to pick up the screw rod 120 and place it in the guide sleeve 110 .

[0076] In this step, the screw rod 120 pick-and-place machine picks up the screw rod 120 and then inserts the screw rod 120 into the guide sleeve 110 from top to bottom, and finally releases the screw rod 120; at this time, the screw rod 120 and the guide sleeve 110 are pre-assembled together but the two are fastened in the upper position.

[0077] S400 , controlling the screw rod pressing assembly 6 to press the screw rod 120 downward, so that the screw rod 120 and the guide sleeve 110 are assembled together.

[0078] In this step, the screw rod pressing assembly 6 assembles the screw rod 120 and the guide sleeve 110 together.

[0079] S500 , controlling the turntable 3 to rotate until the guide sleeve 110 corresponds to the piston rod conveying mechanism 71 .

[0080] In this step, the turntable 3 is controlled to rotate so that the assembled screw rod 120 and the guide sleeve 110 move to the top of the piston rod taking and placing mechanism 72 .

[0081] S600 , controlling the piston rod conveying mechanism 71 to convey the piston rod 130 , and controlling the piston rod taking and placing mechanism 72 to insert the piston rod 130 upward from the bottom of the turntable 3 into the guide sleeve 110 .

[0082] S700 , controlling the piston rod fastening assembly 8 to drive the screw rod 120 to rotate relative to the piston rod 130 , so that the screw rod 120 and the piston rod 130 are tightened to obtain the screw rod-piston assembly 100 .

[0083] Step S600 and step S700 may be performed synchronously, that is, while the piston rod 130 is inserted into the guide sleeve 110 , the combination of the screw rod 120 and the guide sleeve 110 is also rotating.

[0084] In this disclosure, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0085] In this disclosure, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions appear, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, the phrase "above," "above," and "above" a first feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The phrase "below," "below," and "below" a first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0086] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only embodiment.

[0087] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above embodiments merely illustrate several implementations of the present disclosure, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art would be able to make numerous variations and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. An assembly device for a screw rod piston assembly of an injection pump for a microfluidic system, the screw rod piston assembly comprising a guide sleeve, a screw rod and a piston rod, characterized in that: include: Rotating assembly; A turntable connected to the rotating assembly and capable of rotating around its own central axis when driven by the rotating assembly, wherein a plurality of fixing fixtures are evenly spaced along the circumference of the upper surface of the turntable, and the fixing fixtures are used to position the guide sleeve; and The guide sleeve providing assembly, the screw rod providing assembly, the screw rod pressing assembly, the piston rod providing assembly and the piston rod fastening assembly are sequentially spaced along the circumference of the turntable; wherein The guide sleeve providing assembly includes a guide sleeve conveying mechanism and a guide sleeve picking and placing mechanism, wherein the guide sleeve conveying mechanism is configured to convey the guide sleeve toward the turntable along the radial direction of the turntable, and the guide sleeve picking and placing mechanism is configured to pick up the guide sleeve conveyed by the guide sleeve conveying mechanism and place it on the fixing fixture; The screw rod providing assembly includes a screw rod conveying mechanism and a screw rod picking and placing mechanism, wherein the screw rod conveying mechanism is configured to convey the screw rod toward the turntable along the radial direction of the turntable, and the screw rod picking and placing mechanism is configured to pick up the screw rod conveyed by the screw rod conveying mechanism and insert the screw rod into the guide sleeve from top to bottom; The screw rod pressing assembly is used to press the screw rod downward so that the screw rod and the guide sleeve are assembled together; The piston rod providing assembly includes a piston rod conveying mechanism and a piston rod picking and placing mechanism, wherein the piston rod conveying mechanism is configured to convey the piston rod toward the turntable along the radial direction of the turntable, and the piston rod picking and placing mechanism is configured to pick up the piston rod conveyed by the piston rod conveying mechanism and insert the piston rod into the guide sleeve from bottom to top; The piston rod fastening assembly is located above the turntable and is configured to be able to mate with the screw rod to drive the screw rod to rotate relative to the piston rod, so that the screw rod and the piston rod are tightened to form the screw rod-piston assembly; and further includes: A control system is provided, wherein the control system is used to control the operation of the rotating assembly, the guide sleeve providing assembly, the screw rod providing assembly, the screw rod pressing assembly, the piston rod providing assembly and the piston rod fastening assembly.

2. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 1, characterized in that: The guide sleeve conveying mechanism includes: a first vibrating plate, a first conveying track connected to the first vibrating plate, a first buffer position, and a first transverse driving cylinder, wherein the first buffer position is connected to the end of the first conveying track, and the first transverse driving cylinder is used to push the guide sleeve on the first conveying track to the first buffer position; The guide sleeve picking and placing mechanism includes: a first picking cylinder, a first clamping claw controlled by the first picking cylinder, a first lifting cylinder, a first radial adjusting member, and a first supporting structure. The first clamping claw clamps or releases the guide sleeve under the control of the first picking cylinder. The first lifting cylinder is arranged on the first supporting structure to drive the first picking cylinder and the first clamping claw to rise and fall. The first radial adjusting member is movably arranged on the first supporting structure to drive the first picking cylinder and the first clamping claw to move radially along the turntable.

3. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 1, characterized in that: The screw rod conveying mechanism includes: a second vibrating plate, a second conveying track connected to the second vibrating plate, a second buffer position, and a second transverse driving cylinder, wherein the second buffer position is connected to the end of the second conveying track, and the second transverse driving cylinder is used to push the screw rod on the second conveying track to the second buffer position; The screw rod picking and placing mechanism includes: a second picking cylinder, a second clamping jaw controlled by the second picking cylinder, a second lifting cylinder, a second radial adjusting member, and a second supporting structure. The second clamping jaw clamps or releases the screw rod under the control of the second picking cylinder. The second lifting cylinder is arranged on the second supporting structure to drive the second picking cylinder and the second clamping jaw to rise and fall. The second radial adjusting member is movably arranged on the second supporting structure to drive the second picking cylinder and the second clamping jaw to move radially along the turntable.

4. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 1, characterized in that: The screw rod pressing assembly includes a pressing cylinder located above the turntable, and the pressing cylinder has an output end that can be retracted.

5. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 1, characterized in that: The piston rod conveying mechanism includes: a third vibration plate, and a third conveying track connected to the third vibration plate; The piston rod picking and placing mechanism includes: a lifting cylinder and a material receiving part. The material receiving part is located below the turntable and docked with the end of the third conveying track. The material receiving part is used to receive the piston rod from the third conveying track. The lifting cylinder is used to drive the material receiving part to rise and fall.

6. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 1, characterized in that: The piston rod fastening assembly includes a first lifting assembly and a tightening motor connected to an output end of the first lifting assembly. The output end of the tightening motor is used to drive the screw rod to rotate relative to the piston rod.

7. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 1, characterized in that: It also includes a torque testing assembly, which is located between the piston rod fastening assembly and the guide sleeve providing assembly; the torque testing assembly includes a second lifting assembly and a torque testing machine connected to the output end of the second lifting assembly, the second lifting assembly is used to drive the torque testing machine to rise and fall along the axial direction of the turntable, and the torque testing machine is used to test the screwing torque between the screw rod and the piston rod.

8. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 1, characterized in that: It also includes a discharging assembly, which is located between the guide sleeve providing assembly and the piston rod fastening assembly. The discharging assembly includes: a discharging track and a finished product picking and placing mechanism. The discharging track is provided on one side of the turntable, and the finished product picking and placing mechanism is used to transfer the screw rod piston group on the turntable to the discharging track.

9. The assembly equipment of the screw rod piston assembly of the injection pump for the microfluidic system according to claim 8, characterized in that: The discharging track is arranged to be inclined relative to the axial direction of the turntable.

10. A method for assembling a screw rod piston assembly of an injection pump for a microfluidic system, characterized in that: Applied to the assembly device according to any one of claims 1 to 9, the method comprises the steps of: Controlling the guide sleeve conveying mechanism to convey the guide sleeve, and utilizing the guide sleeve taking and placing mechanism to place the guide sleeve on the fixing fixture; Controlling the turntable to rotate until the guide sleeve corresponds to the screw rod conveying mechanism; Controlling the screw rod conveying mechanism to convey the screw rod, and controlling the screw rod pick-and-place machine to pick up the screw rod and place it in the guide sleeve; Controlling the screw rod pressing assembly to press the screw rod downward so that the screw rod and the guide sleeve are assembled together; Controlling the turntable to rotate until the guide sleeve corresponds to the piston rod conveying mechanism; Controlling the piston rod conveying mechanism to convey the piston rod, and controlling the piston rod taking and placing mechanism to insert the piston rod upward from the bottom of the turntable into the guide sleeve; The piston rod fastening assembly is controlled to drive the screw rod to rotate relative to the piston rod, so that the screw rod and the piston rod are tightened to obtain the screw rod piston assembly.

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