Multi-speed rotary drive structure

Abstract

The invention discloses a multi-gear rotation drive structure, which belongs to the field of medical equipment, and includes a coaxially arranged fixed cylinder, a driving cylinder, a first rotating cylinder and a second rotating cylinder. The lower end of the driving cylinder is provided with a positioning conical cylinder, and the outer ring of the positioning conical cylinder is provided with a coaxial torsion spring. Under normal conditions, the torsion spring has a certain pre-torque; the lower end of the positioning conical cylinder is provided with a stop cylinder, and the outer ring of the stop cylinder is provided with a first stop claw. The lower end of the first rotating cylinder is provided with a plurality of first stop protrusions, and the first stop claw is arranged in cooperation with the first stop protrusion. The plurality of first stop protrusions are arranged at the groove of the outer ring of the fixed syringe. The second rotating cylinder is provided with at least one second stop claw, and the second stop claw and the protrusion position of the fixed syringe form a ratchet and pawl mechanism. The invention can realize the rotation drive of multiple needles, and can prevent reversal, has high safety, and can display the gear position in real time, and is convenient to use and observe.

Description

Technical Field

[0001] The invention belongs to the field of medical equipment and relates to a lancing pen, in particular to a multi-gear rotary drive structure for a multi-head lancing pen. Background Art

[0002] The lancing needle is used for blood sampling. Routine physical examinations, blood sugar tests, etc. all require a lancing pen. The lancing pen is a type of lancing needle. It mostly uses a mechanical device in structure, and the needle uses a ejection device. It can almost completely pierce the skin accurately, quickly, at an appropriate depth, and in a straight path, greatly reducing the patient's pain and bringing sampling into a new stage of development. It has basically solved the problems of the previous two generations of lancing needles, such as strong pain and large wounds.

[0003] At present, the commonly used blood collection needles on the market are shaped like pistols or pens, which can often attract children's attention and reduce psychological pressure. They also have the same effect on adult patients, but they also have their shortcomings: although the needles of such blood collection needles can be used once, they need to be frequently replaced and adjusted, especially during physical examinations. The replacement frequency is higher, which affects work efficiency and takes up patients' waiting time. In addition, the labor intensity is relatively high for a long time. The multi-head blood collection needles on the market now all rise and fall at the same time and are used for cupping and bloodletting. It is impossible to realize the multi-head storage and single needle movement.

[0004] When it comes to multiple gears, multiple gears need to be driven in the vertical direction and the circumferential direction, and it is necessary to realize the rotation of multiple workstations within a limited space, which is very difficult. Summary of the invention

[0005] In view of the problems existing in the above background technology description, the present invention provides a multi-gear rotation drive structure, which can realize multi-needle rotation drive and prevent reversal, has high safety, can display the gear position in real time, and is easy to use and observe.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-gear rotation drive structure, including a coaxially arranged fixed cylinder, a driving cylinder, a first rotating cylinder and a second rotating cylinder, the first rotating cylinder is arranged on the outer ring of the lower end of the driving cylinder, and the second rotating cylinder is arranged on the outer ring of the lower end of the first rotating cylinder; a positioning conical cylinder is provided at the lower end of the driving cylinder, a first positioning vertical groove is provided at the upper end of the positioning conical cylinder, a positioning vertical block is provided at the lower end of the positioning conical cylinder, a second positioning vertical groove is opened on one end surface of the positioning vertical block, a coaxial torsion spring is provided on the outer ring of the positioning conical cylinder, a first vertical rod is provided at the upper end of the torsion spring, and a second vertical rod is provided at the lower end of the torsion spring. The first vertical rod is arranged in the first positioning vertical groove, the second vertical rod is arranged through the positioning vertical block, and when the torsion spring is in a relaxed state, the second vertical rod is located at the end of the positioning vertical block away from the second positioning vertical groove; a stopping cylinder is provided at the lower end of the positioning conical cylinder, and a first stopping claw is provided at the outer ring of the stopping cylinder, and a plurality of first stopping protrusions are provided at the lower end of the first rotating cylinder, and the first stopping protrusion is arranged at the groove of the outer ring of the fixed syringe, and a third positioning vertical block and a plurality of evenly distributed second stopping claws are provided on the second rotating cylinder, and the second stopping claw and the protruding position constituting the groove form a ratchet and pawl mechanism, and the inner wall of the third positioning vertical block is arranged in contact with the outer wall of the first stopping protrusion.

[0007] Furthermore, multiple first stop protrusions are evenly distributed relative to the axis of the stop cylinder, one of the first stop protrusions is provided with a penetrating third positioning vertical groove, and a second positioning vertical block is provided on the outer wall of the first stop protrusion, the third positioning vertical groove is arranged correspondingly to the first positioning vertical groove up and down, the second vertical rod is inserted in the third positioning vertical groove, and the first positioning vertical groove, the second positioning vertical groove and the third positioning vertical groove are all open structures.

[0008] Furthermore, the second rotating cylinder realizes its axial positioning through the shoulder structure inside the fixed cylinder, and a plurality of thirteenth positioning protrusions extending downward are provided in the middle of the first rotating cylinder. In the mating state, the thirteenth positioning protrusion is arranged in contact with the upper end surface of the second rotating cylinder.

[0009] Furthermore, a plurality of fourteenth positioning protrusions extending upward are provided at the upper end of the first rotating cylinder, a fourth stop protrusion is provided at the outer ring of the driving cylinder, and the upper end surface of the fourteenth positioning protrusion is fitted with the lower end surface of the fourth stop protrusion.

[0010] Furthermore, a first observation window is provided on the fixed cylinder, the first observation window corresponds to the first rotating cylinder, and numbers corresponding to the gear positions are provided on the first rotating cylinder.

[0011] Furthermore, the outer ring of the fixed cylinder is provided with a second observation window, the second observation window is provided with an operating protrusion, the operating protrusion is fixedly connected to the second rotating cylinder, and the second rotating cylinder is rotated by the operating protrusion to drive the fixed syringe to rotate.

[0012] Furthermore, the interior of the driving cylinder is a hollow structure, the lower end of the interior of the driving cylinder is provided with an annular eleventh positioning protrusion, and the lower end of the driving cylinder is provided with a guide rod extending upward.

[0013] Furthermore, a twelfth positioning protrusion extending outward is provided at the upper end of the driving cylinder, and a fourth stop protrusion is provided at the middle of the outer ring of the driving cylinder.

[0014] Furthermore, the driving cylinder is also provided with an avoidance hole, a second guide groove, a transverse groove, a vertical groove, a third limiting groove, a fourth limiting groove and a transverse limiting groove.

[0015] Furthermore, the inner wall of the upper end of the fixed cylinder is provided with a first guide groove which is concave and cooperates with the first guide protrusion and the fourth stop protrusion, and a protrusion corresponding to the transverse limit groove is provided on one side of the first guide groove. The outside of the fixed cylinder is provided with a first observation window and a second observation window, and the inside of the fixed cylinder is also provided with a reset spring, and the reset spring is arranged between the first positioning claw and the second positioning claw; the lower end of the fixed cylinder is provided with a positioning block and a positioning groove.

[0016] Compared with the prior art, the present invention has the following advantages and positive effects:

[0017] The first rotating cylinder in the rotation drive assembly of the present invention is clamped and fixed with the ring cylinder of the multi-needle fixing assembly, and the second rotating cylinder and the ring cylinder form a ratchet and pawl mechanism. When in use, the first rotating cylinder, the ring cylinder and the blood collection needle in the ring cylinder are driven to rotate by rotating the second rotating cylinder, thereby achieving the purpose of replacing a new blood collection needle for use. At the same time, the ratchet and pawl mechanism facilitates resetting the operating protrusion, and at the same time, the first stopping claw of the driving cylinder clamps the ring cylinder to prevent the first rotating cylinder and the ring cylinder from rotating in the opposite direction, thereby facilitating the operation of rotating again to replace a new blood collection needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0019] Figure 1 It is a structural schematic diagram of the multi-gear linear rotary drive structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the multi-gear linear rotary drive structure of the present invention without a fixed cylinder;

[0021] Figure 3 The present invention Figure 2 A cross-sectional view of

[0022] Figure 4 It is a cross-sectional view of the multi-gear linear rotary drive structure of the present invention without the fixed cylinder and the fixed needle cylinder;

[0023] Figure 5 It is a schematic diagram of the structure of the driving cylinder of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the driving rod of the present invention;

[0025] Figure 7 It is a schematic structural diagram of the torsion spring of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the first rotating drum of the present invention;

[0027] Fig. 9 It is a schematic structural diagram of a side view of a fixed cylinder of the present invention;

[0028] Fig.10 It is a schematic diagram of the structure of the fixed cylinder of the present invention when viewed from above;

[0029] Fig.11 is a schematic structural diagram of the second rotating drum of the present invention;

[0030] Fig.12 It is a structural schematic diagram of a button of the present invention;

[0031] Fig.13 It is a schematic diagram of the matching structure of the button, the driving rod and the return spring of the present invention;

[0032] Fig.14 It is a structural schematic diagram of the driving cylinder of the present invention;

[0033] Fig.15 It is a schematic diagram of the structure of the internal return spring and lifting spring of the present invention;

[0034] Fig.16 It is a schematic diagram of the structure of the fixed needle cylinder and the second rotating cylinder of the present invention;

[0035] Fig.17 It is a schematic diagram of the connection relationship between the first stop claw and the card slot of the present invention;

[0036] Fig.18 It is a schematic diagram of the limiting structure among the driving cylinder, the first rotating cylinder and the second rotating cylinder in the present invention.

[0037] Reference numerals:

[0038] 61. driving rod; 612. driving head; 6121. lifting and rotating driving surface; 6122. rotating positioning boss; 613. guiding empty rod; 6131. ​​introducing groove; 615. second positioning claw; 62. driving cylinder; 621. eleventh positioning protrusion; 622. introducing rod; 623. avoiding hole; 624. second guiding groove; 6241. vertical groove; 6242. transverse groove; 625. third limiting groove; 6251. transverse limiting groove; 626. twelfth positioning protrusion; 6261. fourth limiting groove; 627. fourth stopping protrusion; 628. positioning conical cylinder; 6281. first positioning vertical groove; 6282. second positioning vertical groove; 6283. positioning vertical block; 629. stopping cylinder; 6291. first stopping claw; 63. button; 631. first positioning claw; 632. first guiding protrusion; 633, second guide protrusion; 634, third limiting protrusion; 6341, fourth limiting protrusion; 635, driving rib; 64, lifting spring; 65, fixed cylinder; 651, first guide groove; 652, first observation window; 653, second observation window; 655, reset spring; 656, positioning block; 657, positioning groove; 658, protrusion; 66, torsion spring; 661, first vertical rod; 662, second vertical rod; 67, first rotating cylinder; 671, thirteenth positioning protrusion; 672, first stopping protrusion; 6721, third positioning vertical groove; 6722, second positioning vertical block; 673, fourteenth positioning protrusion; 68, second rotating cylinder; 681, second stopping claw; 682, third positioning vertical block; 69, operating protrusion; 21, fixed syringe; 211, groove; 212, slot. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0042] Again, it should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clear, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] like Figure 1-Figure 16As shown, the multi-gear rotation drive structure includes a coaxially arranged fixed cylinder 65, a driving cylinder 62, a first rotating cylinder 67 and a second rotating cylinder 68, wherein the first rotating cylinder 67 is arranged at the lower end of the driving cylinder 62, and the second rotating cylinder 68 is arranged at the lower end of the first rotating cylinder 67; a positioning conical cylinder 628 is provided at the lower end of the driving cylinder 62, a first positioning vertical groove 6281 is provided at the upper end of the positioning conical cylinder 628, a positioning vertical block 6283 is provided at the lower end of the positioning conical cylinder 628, a second positioning vertical groove 6282 is provided on one end surface of the positioning vertical block 6283, a coaxial torsion spring 66 is provided on the outer ring of the positioning conical cylinder 628, a first vertical rod 661 is provided at the upper end of the torsion spring 66, and a second vertical rod 661 is provided at the lower end of the torsion spring 66 Rod 662, the first vertical rod 661 is arranged in the first positioning vertical groove 6281, and the second vertical rod 662 is arranged through the positioning vertical block 6283. When the torsion spring 66 is in a relaxed state, its second vertical rod 662 is located at the end of the positioning vertical block 6283 away from the second positioning vertical groove 6282; during the assembly process, it is used to position the torsion spring 66, and the torsion spring 66 can rotate relative to it to facilitate the installation of the first rotating cylinder 67. Under normal conditions, the torsion spring 66 has a certain pre-torque, and a certain force needs to be applied when adjusting the gear position to avoid misoperation. The second rotating cylinder 68 is reset by manually turning the operating protrusion 69, and the torsion spring 66 can return the first rotating cylinder 67 to its initial position after the fixed syringe 21 is pulled out. A stop cylinder 629 is provided at the lower end of the positioning conical cylinder 628, and a first stop claw 6291 is provided on the outer ring of the stop cylinder 629. A plurality of first stop protrusions 672 are provided at the lower end of the first rotating cylinder 67. The first stop protrusion 672 is arranged at the groove 211 of the outer ring of the fixed syringe 21, and is used to clamp and fix the first rotating cylinder 67 to the fixed syringe 21. The claw end of the first stop claw 6291 is used to limit the groove 211 to prevent reverse rotation. A third positioning vertical block 682 and a plurality of evenly distributed second stop claws 681 are provided on the second rotating cylinder 68. The second stop claw 681 and the raised position constituting the groove 211 form a ratchet and pawl mechanism. The inner wall of the third positioning vertical block 682 is arranged to fit the outer wall of the first stop protrusion 672.

[0047] like Figure 1-Figure 4 and Fig.15As shown, the button 63, the fixed cylinder 65, the driving cylinder 62 and the driving rod 61 are coaxially arranged, the button 63 is arranged inside the fixed cylinder 65 and the two are coaxially arranged, the button 63 is arranged on the upper end of the fixed cylinder 65 protruding upward, and a first positioning claw 631 extending downward is provided at the middle position of the interior of the button 63, and the first positioning claw 631 is a two-petal structure; the driving cylinder 62 is arranged below the button 63 and on the inner circle of the fixed cylinder 65, the lower end of the driving rod 61 is inserted into the driving cylinder 62, and the upper end of the driving rod 61 extends out of the driving cylinder 62, and a second positioning claw 615 is provided at the upper end of the driving rod 61, and the second positioning claw 615 and the first positioning claw 631 are arranged correspondingly, and the second positioning claw 615 is also a two-petal structure, and a reset spring 655 is provided between the first positioning claw 631 and the second positioning claw 615. Such a structure is adopted to facilitate the positioning of the two ends of the reset spring 655, and a avoidance hole 623 is provided on the driving cylinder 62 for facilitating the upward and downward movement of the driving rod 61.

[0048] The interior of the driving cylinder 62 is a hollow structure, and the lower end of the interior of the driving cylinder 62 is provided with an annular eleventh positioning protrusion 621, and the lower end of the driving cylinder 62 is provided with an upwardly extending introduction rod 622, and the upper end of the introduction rod 622 is a conical structure, which is convenient for introduction and improves the efficiency of assembly. The driving rod 61 includes a driving head 612 located at the upper end and a guide hollow rod 613 located at the lower end, and the second positioning claw 615 is provided at the upper end of the driving head 612, and the guide hollow rod 613 is coaxially arranged with the driving head 612, and the guide hollow rod 613 is provided at the lower end of the driving head 612 and extends vertically downward. , the guide hollow rod 613 is provided with an introduction groove 6131 inside, and in the matched state, the introduction rod 622 is extended into the introduction groove 6131 to ensure the accuracy of the up and down movement of the driving rod 61 relative to the driving cylinder 62, and improve the stability; a lifting spring 64 is provided between the lower end of the driving head 612 and the eleventh positioning protrusion 621, and the lifting spring 64 is arranged on the outer ring of the eleventh positioning protrusion 621 and the two are arranged coaxially, and the guide hollow rod 613 is coaxially arranged with the lifting spring 64, and when the button 63 moves downward, the reset spring 615 between the first positioning claw 631 and the second positioning claw 615 is pressed. 55 generates pre-pressure, generates forces in both axial and circumferential directions, the upper end of the lifting spring 64 is fixedly connected to the lower end of the driving head 612, the lower end of the lifting spring 64 is fixedly connected to the inside of the driving cylinder 62, the button 63 is provided with a driving rib 635 inside, the lifting and rotating driving surface 6121 on the driving rod 61 is a wedge-shaped surface, in the initial state, the rotation positioning boss 6122 is arranged in the transverse groove 6242 of the driving cylinder 62, the driving rod 61 does not rotate and move axially, and in the descending process, the lower end of the driving rib 635 contacts the lifting and rotating driving surface of the driving rod 61 When the rotating positioning boss 6122 of the driving rod 61 reaches the top of the driving cylinder 62, the driving rod 61 rotates under the action of the torsion of the reset spring 655, and the rotating positioning boss 6122 rotates into the horizontal groove 6242 of the driving cylinder 62, and returns to the initial position before firing.

[0049] Combination Fig.14As shown, the outer ring of the lower part of the button 63 is provided with a first guide protrusion 632, and the inner wall of the upper end of the fixing cylinder 65 is provided with a concave first guide groove 651. The first guide protrusion 632 extends into the first guide groove 651 and the two are matched with each other in clearance, and slide up and down. During installation, the first guide protrusion 632 and the first guide groove 651 play a guiding role to achieve rapid assembly and positioning. There are multiple first guide protrusions 632, and one first guide protrusion 632 corresponds to one first guide groove 651. The structure is symmetrical and the force is balanced. The lower end of the button 63 is provided with a second guide protrusion 633 extending downward, and the upper end of the driving cylinder 62 is provided with a third limiting groove 625. The second guide protrusion 633 extends into the third limiting groove 625, and the two are matched with each other in clearance and slide up and down. During installation, the second guide protrusion 633 and the third limiting groove 625 play a guiding role, realizing rapid assembly and positioning, while ensuring the accuracy of the upward and downward movement of the button 63 relative to the driving cylinder 62, limiting the downward movement distance of the button 63, and playing a stop role. The second guide protrusion 633 When the button 63 contacts the bottom of the third limiting groove 625, the downward movement of the button 63 stops; the number of the second guide protrusions 633 is multiple, and one second guide protrusion 633 corresponds to one third limiting groove 625, with a symmetrical structure and balanced force; the lower end of the button 63 is provided with a third limiting protrusion 634 extending downward, and the upper end of the driving cylinder 62 is provided with a fourth limiting groove 6261, the third limiting protrusion 634 extends into the fourth limiting groove 6261 and the two are clearance-matched and slide up and down. During installation, the third limiting protrusion 634 and the fourth limiting groove 6261 play a guiding role, realizing rapid assembly and positioning, while ensuring the accuracy of the upward and downward movement of the button 63 relative to the driving cylinder 62; the number of the third limiting protrusions 634 is multiple, and one third limiting protrusion 634 corresponds to one fourth limiting groove 6261, with a symmetrical structure and balanced force. The above structural setting realizes multiple guiding and positioning in the axial direction, improves the accuracy of the up and down movement between the parts with a matching relationship, limits the stop position of the upward movement of the button 63, and prevents the button 63 from escaping from the fixed cylinder 65.

[0050] The first guide protrusion 632 and the second guide protrusion 633 are arranged between the two third limiting protrusions 634. The lower end of the third limiting protrusion 634 is T-shaped. The fourth limiting protrusions 6341 extending in the circumferential direction are symmetrically arranged on both sides of the lower end of the third limiting protrusion 634. The span of the two fourth limiting protrusions 6341 arranged at the lower end of the same third limiting protrusion 634 is greater than the width of the fourth limiting groove 6261, which limits the retraction stroke of the button 63 to prevent the button 63 from escaping from the fixed cylinder 65 when the hand is released.

[0051] The upper end of the driving cylinder 62 is provided with a twelfth positioning protrusion 626 extending outward. At the upper limit position, the upper end surface of the fourth limiting protrusion 6341 is fitted with the lower end surface of the twelfth positioning protrusion 626 to position the upper limit position of the button 63 to prevent the button 63 from escaping from the fixed cylinder 65 when the hand is released.

[0052] The upper end of the button 63 is in a circular ring shape, which is aesthetically pleasing and prevents sharp edges from injuring the operator. It also facilitates mold production and reduces mold costs. The inner wall of the button 63 is provided with multiple reinforcing ribs to enhance the strength of the button 63.

[0053] A fourth stop protrusion 627 is provided in the middle of the outer ring of the driving cylinder 62. The fourth stop protrusion 627 is arranged corresponding to the first guide groove 651. When the driving cylinder 62 is installed relative to the fixed cylinder 65, the circumferential positioning of the two is facilitated to prevent the driving cylinder 62 from rotating, while ensuring the up and down movement accuracy of the two in the axial direction.

[0054] A transverse limiting groove 6251 is also provided on the outside of the driving cylinder 62, and the transverse limiting groove 6251 is arranged corresponding to the protrusion 658 inside the fixed cylinder 65. During assembly, the protrusion 658 produces elastic deformation, and then the protrusion 658 is stuck in the transverse limiting groove 6251, thereby realizing the installation of the driving cylinder 62 and the fixed cylinder 65.

[0055] The button 63, the fixed cylinder 65, the driving cylinder 62 and the driving rod 61 are all made of engineering plastics, which can reduce production costs during mass production. The thickness of the fixed cylinder 65 is gradually increased from top to bottom, which can increase strength and facilitate demolding, thereby reducing mold costs to a certain extent.

[0056] Combination Figure 11-18, the outer ring of the lower end of the driving cylinder 62 is provided with a first rotating cylinder 67, and the outer ring of the lower end of the first rotating cylinder 67 is provided with a second rotating cylinder 68, and the first stopping protrusions 672 are evenly arranged relative to the axis of the stopping cylinder 629, one of the first stopping protrusions 672 is provided with a third vertical positioning groove 6721 penetrating therethrough, and a second vertical positioning block 6722 is provided on the outer wall of the first stopping protrusion 672, the third vertical positioning groove 6721 is arranged corresponding to the first vertical positioning groove 6281, and the second vertical rod 662 is inserted in the third vertical positioning groove 6721, and the first vertical positioning groove 6281 and the second vertical positioning groove 6282 are both open structures; when assembling, the first vertical rod 661 of the torsion spring 66 is inserted in the first vertical positioning groove 6281, and the second vertical rod 662 is inserted in the second vertical positioning groove 6282, and then the first rotating cylinder 67 is sleeved on the outside of the driving cylinder 62, and finally the second vertical rod 662 is inserted in the third vertical positioning groove 6721. The second rotating cylinder 68 realizes its axial positioning through the shoulder structure arranged inside the fixed cylinder 65. A plurality of thirteenth positioning protrusions 671 extending downward are provided in the middle part of the first rotating cylinder 67. In the mating state, the thirteenth positioning protrusion 671 is fitted with the upper end surface of the second rotating cylinder 68, thereby realizing the axial positioning of the first rotating cylinder 67. A plurality of fourteenth positioning protrusions 673 extending upward are provided at the upper end of the first rotating cylinder 67. The upper end surface of the fourteenth positioning protrusion 673 is fitted with the lower end surface of the fourth stop protrusion 627, thereby further realizing the positioning of the first rotating cylinder 67 in the axial direction.

[0057] like Figure 2 As shown, a plurality of first stop protrusions 672 are arranged at the groove 211 of the outer ring of the fixed syringe 21, so as to realize the circumferential positioning of the first stop protrusions 672. During the rotation of the fixed syringe 21, the first rotating cylinder 67 is driven to rotate together. A first observation window is provided on the fixed cylinder 65, and the first observation window 652 corresponds to the first rotating cylinder 67. Numbers corresponding to different gears are provided on the first rotating cylinder 67. Each rotation represents a change in the number representing the gear, so as to realize the display status during the gear adjustment process.

[0058] like Fig.16 As shown, at least one second stop claw 681 is provided on the second rotating cylinder 68, and the second stop claw 681 and the inner wall position of the groove 211 of the fixed syringe 21 form a ratchet and pawl mechanism, which can only rotate in a fixed direction along the axis. The outer ring of the fixed cylinder 65 is provided with a second observation window 653, and the second observation port 653 is provided with an operating protrusion 69. The operating protrusion 69 is fixedly connected to the second rotating cylinder 68, and can be matched by means of positioning protrusions and grooves, or by bonding. The second rotating cylinder 68 is rotated by operating the protrusion 69, which drives the fixed syringe 21 to rotate, thereby realizing the rotation of multiple needles. Each needle rotates once after use and cannot rotate in the opposite direction, ensuring disposable use and improving safety.

[0059] When all the blood collection needles are used up, the second positioning vertical block 6722 of the first rotating cylinder 67 is engaged with the third positioning vertical block 682 of the second rotating cylinder 68. At the same time, the top of the second positioning vertical block 6722 of the first rotating cylinder 67 is engaged with the positioning vertical block 6283 of the driving cylinder 62. Therefore, the driving cylinder 62, the first rotating cylinder 67 and the second rotating cylinder 68 are all stuck, so that the blood collection pen can no longer rotate. The schematic diagram of this limit structure is shown in FIG. Fig.18 As shown; that is, the blood collection needle needs to be replaced at this time, and this matching setting can also prevent the blood collection needle from being reused to ensure safety.

[0060] Lifting process principle:

[0061] When the button 63 moves downward, the return spring 655 is compressed and the return spring 655 is energized. At this time, the rotation positioning boss 6122 of the driving rod 61 is in the transverse groove 6242 of the driving cylinder 62 under the action of the torque of the return spring 655. The driving cylinder 62 does not rotate or move axially. The return spring 655 is always in a compressed energy storage state. When the driving rib plate 635 of the button 63 contacts the lifting and rotating driving surface 6121 on the upper part of the driving rod 61, the driving rod 61 starts to rotate. When the rotation positioning boss 6122 on the driving rod 61 is disengaged from the transverse groove 6242, the driving rod 61 moves downward and is launched under the action of the energy-storing return spring 655, and the lifting spring 64 is energized. During the launching process, the front end of the driving rod 61 hits the tail of the blood collection needle, and the blood collection needle moves forward under the impact of the driving rod 61. During the firing process, the lifting spring 64 is compressed to store energy, and the return spring 655 is stretched to store energy. After the driving rod 61 hits the blood collection needle, it quickly retracts under the action of the lifting spring 64 and the return spring 655, and the driving rod 61 retreats to the bottom of the driving cylinder 62. Under the action of the torsion of the return spring 655, the rotation positioning bosses 6122 on both sides of the driving rod 61 rotate into the horizontal groove 6242 of the driving cylinder 62 and return to the initial firing position.

[0062] Principle of rotation process:

[0063] Manually turn the operating protrusion 69 to drive the second rotating cylinder 68 to rotate, and the fixed syringe 21 rotates under the action of the second stopping claw 681. At the same time, the groove 211 on the outer ring of the fixed syringe 21 drives the first rotating cylinder 67 to rotate through the first stopping protrusion 672. When the operating protrusion 69 reaches the other end of the second observation window, the new blood collection needle and the needle outlet hole are positioned, and the first stopping claw 6291 on the driving cylinder 62 is fixed to the slot 212 inside the fixed syringe 21, thereby preventing the fixed syringe 21 from rotating in the opposite direction; manually rotate the operating protrusion 69 in the opposite direction to return the operating protrusion 69 to the initial end. At this time, the second rotating cylinder 68 returns to its original position, and the fixed syringe 21 will not rotate under the fixing action of the first stopping claw 6291, thereby avoiding the problem of repeated use of blood collection needles and ensuring safety.

[0064] When all the blood collection needles are used up, the usage of the blood collection needles can be judged by observing the gear position number on the first rotating cylinder 67 through the first observation window 652. When all the blood collection needles are used up, the driving cylinder 62, the first rotating cylinder 67 and the second rotating cylinder 68 are stuck to each other so that the blood collection pen cannot rotate. In addition, the usage of the blood collection needle can be judged by observing the gear position number on the first rotating cylinder 67 through the first observation window 652. At this time, the blood collection needle needs to be replaced.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multi-gear rotary drive structure, characterized in that: The invention comprises a coaxially arranged fixed cylinder (65), a driving cylinder (62), a first rotating cylinder (67) and a second rotating cylinder (68), wherein the first rotating cylinder (67) is arranged at the lower end of the driving cylinder (62), and the second rotating cylinder (68) is arranged at the lower end of the first rotating cylinder (67); a positioning conical cylinder (628) is arranged at the lower end of the driving cylinder (62), a first positioning vertical groove (6281) is arranged at the upper end of the positioning conical cylinder (628), a positioning vertical block (6283) is arranged at the lower end of the positioning conical cylinder (628), and a second positioning vertical groove (6282) is opened on one end surface of the positioning vertical block (6283); a coaxial torsion spring (66) is arranged at the outer ring of the positioning conical cylinder (628), a first vertical rod (661) is arranged at the upper end of the torsion spring (66), and a second vertical rod (661) is arranged at the lower end of the torsion spring (66). Rod (662), the second vertical rod (662) is set through the positioning vertical block (6283), the first vertical rod (661) is set in the first positioning vertical groove (6281); the lower end of the positioning conical cylinder (628) is provided with a stopping cylinder (629), the outer ring of the stopping cylinder (629) is provided with a first stopping claw (6291), the lower end of the first rotating cylinder (67) is provided with a first stopping protrusion (672), the first stopping claw (6291) is matched with the card groove (212) inside the fixed syringe (21); the first stopping protrusion (672) is set at the groove (211) of the outer ring of the fixed syringe (21), the second rotating cylinder (68) is provided with a second stopping claw (681), the second stopping claw (681) and the protruding position constituting the groove (211) form a ratchet pawl mechanism.

2. The multi-gear rotary drive structure according to claim 1, characterized in that: Multiple first stop protrusions (672) are evenly distributed relative to the axis of the stop cylinder (629), one of the first stop protrusions (672) is provided with a penetrating third positioning vertical groove (6721), and a second positioning vertical block (6722) is provided on the outer wall of the first stop protrusion (672), the third positioning vertical groove (6721) is arranged corresponding to the first positioning vertical groove (6281), the second vertical rod (662) is inserted in the third positioning vertical groove (6721), and the first positioning vertical groove (6281) and the second positioning vertical groove (6282) are both open structures.

3. The multi-gear rotary drive structure according to claim 1, characterized in that: The second vertical rod (662) is arranged to pass through the positioning vertical block (6283), and when the torsion spring (66) is in a relaxed state, the second vertical rod (662) is located at an end of the positioning vertical block (6283) away from the second positioning vertical slot (6282).

4. The multi-gear rotary drive structure according to claim 1, characterized in that: The second rotating cylinder (68) is axially positioned by means of a shoulder structure inside the fixed cylinder (65); a plurality of thirteenth positioning protrusions (671) extending downward are provided in the middle of the first rotating cylinder (67); the thirteenth positioning protrusions (671) are fitted against the upper end surface of the second rotating cylinder (68).

5. The multi-gear rotary drive structure according to claim 1, characterized in that: The upper end of the first rotating cylinder (67) is provided with a plurality of fourteenth positioning protrusions (673) extending upward, and the outer ring of the driving cylinder (62) is provided with a fourth stop protrusion (627), and the upper end surface of the fourteenth positioning protrusion (673) is arranged to fit the lower end surface of the fourth stop protrusion (627).

6. The multi-gear rotary drive structure according to claim 1, characterized in that: The fixed cylinder (65) is provided with a first observation window (652), the first observation window (652) corresponds to the first rotating cylinder (67), and the first rotating cylinder (67) is provided with numbers corresponding to the gear positions; the outer ring of the fixed cylinder (65) is provided with a second observation window (653), the second observation window (653) is provided with an operating protrusion (69), and the operating protrusion (69) is fixedly connected to the second rotating cylinder (68).

7. The multi-gear rotary drive structure according to claim 1 or 6, characterized in that: The inner wall of the upper end of the fixed cylinder (65) is provided with a first concave guide groove (651), one side of the first guide groove (651) is provided with a protrusion (658), and the lower end of the fixed cylinder (65) is provided with a positioning plug (656) and a positioning groove (657).

8. The multi-gear rotary drive structure according to claim 1, characterized in that: The interior of the driving cylinder (62) is a hollow structure. The lower end of the interior of the driving cylinder (62) is provided with an annular eleventh positioning protrusion (621). The lower end of the driving cylinder (62) is provided with an upwardly extending introduction rod (622).

9. The multi-gear rotary drive structure according to claim 1, characterized in that: The upper end of the driving cylinder (62) is provided with a twelfth positioning protrusion (626) extending outward, and the middle part of the outer ring of the driving cylinder (62) is provided with a fourth stop protrusion (627).

10. The multi-gear rotary drive structure according to claim 9, characterized in that: The driving cylinder (62) is also provided with an avoidance hole (623), a second guide groove (624), a transverse groove (6242), a vertical groove (6241), a third limiting groove (625), a fourth limiting groove (6261) and a transverse limiting groove (6251) corresponding to the protrusion (658).

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