Multi-gear linear drive structure

Abstract

The present invention discloses a multi-gear linear drive structure, belonging to the field of medical devices, which includes a set button, a fixed cylinder, a drive cylinder and a drive rod. The button is arranged inside the upper end of the fixed cylinder and the two are slidably arranged up and down. The drive cylinder is arranged inside the fixed cylinder, and the drive rod is arranged inside the drive cylinder. When the button moves downward, it drives the drive rod to move downward through the avoidance hole on the drive cylinder. The lower end of the drive rod is correspondingly arranged with a blood collection needle on the fixed syringe. An annular eleventh positioning protrusion is arranged at the lower end inside the drive cylinder. The eleventh positioning protrusion is a hollow ring. The drive rod includes a drive head at the upper end and a guiding hollow rod at the lower end. A lifting spring is arranged between the lower end of the drive head and the eleventh positioning protrusion. The lifting spring is arranged on the outer ring of the eleventh positioning protrusion and the two are arranged, and the guiding hollow rod is arranged with the lifting spring. The present invention can realize the drive and reset of the needle in the axial direction, with a compact structure and small occupied space.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, relates to a blood collection pen, and particularly relates to a multi-gear linear drive structure for a multi-head blood collection pen. Background Art

[0002] Blood collection needles are used for blood sampling. Routine physical examinations, blood glucose tests, etc. all require the use of blood collection pens. A blood collection pen is a type of blood collection needle. In terms of structure, it mostly adopts mechanical devices, and the needle head adopts an ejection device, which can almost completely achieve accurate, fast, appropriate depth, and straight-line path piercing of the skin, greatly reducing the pain of patients and enabling sampling to enter a new stage of development, basically solving the problems of strong pain and large wound of the first two generations of blood collection needles.

[0003] Currently, some commonly used blood collection needles on the market are like pistols and some are like pens, which can often attract the attention of children and reduce psychological pressure, and have the same effect on adult patients. However, they also have their deficiencies: Although the needle heads of this type of blood collection needle 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, occupies the patient's queuing time, and the labor intensity is also relatively high for a long time. The multi-head blood collection needles on the market now all rise and fall simultaneously and are used for cupping bloodletting, and cannot achieve the movement of a single needle head with multi-head storage.

[0004] When it comes to the multi-gear situation, it is necessary to drive in the vertical direction and the circumferential direction for multiple gears, and it is very difficult to achieve the rotation of multiple workstations within a limited space. Summary of the Invention

[0005] In view of the problems existing in the above background art description, the present invention provides a multi-gear linear drive structure, which can realize the drive and reset of the needle head in the axial direction, with a compact structure and small occupied space.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a multi-gear linear drive structure, including a button, a fixed cylinder, a drive cylinder, and a drive rod arranged coaxially. The button is arranged inside the upper end of the fixed cylinder and the two are arranged to slide up and down. The drive cylinder is arranged inside the fixed cylinder, and the drive rod is arranged inside the drive cylinder;

[0007] An annular eleventh positioning protrusion is provided at the lower end inside the drive cylinder. The eleventh positioning protrusion is a hollow ring. The drive rod includes a drive head at the upper end and a guiding hollow rod at the lower end. A lifting spring is arranged between the lower end of the drive head and the eleventh positioning protrusion. The lifting spring is arranged on the outer circle of the eleventh positioning protrusion and the two are coaxially arranged. The guiding hollow rod is coaxially arranged with the lifting spring.

[0008] With the above technical solution, when the button moves downward, it drives the drive rod to rotate and then move downward through the avoidance hole on the drive cylinder, and the lower end of the drive rod is correspondingly arranged with the blood collection needle on the fixed syringe barrel.

[0009] Further, a first positioning claw extending downward is provided at the middle position inside the button, a second positioning claw is provided at the upper end of the drive rod, the second positioning claw and the first positioning claw are correspondingly arranged, and both the second positioning claw and the second positioning claw are of a two-lobe structure.

[0010] Further, a guiding rod extending upward is provided at the lower end of the drive cylinder, the upper end of the guiding rod is conical, the guiding hollow rod is coaxially arranged with the drive head, the guiding hollow rod is arranged at the lower end of the drive head and extends vertically downward, and an introduction groove is provided inside the guiding hollow rod. In the mating state, the guiding rod extends into the introduction groove.

[0011] Further, a first guiding protrusion is provided on the outer circumference of the lower part of the button, and a concave first guiding groove is provided on the inner wall of the upper end of the fixed cylinder. The first guiding protrusion extends into the first guiding groove and they are in clearance fit for vertical sliding. The number of the first guiding protrusions is multiple and symmetrically arranged, and one first guiding protrusion corresponds to one first guiding groove.

[0012] Further, a fourth stop protrusion and a horizontal limiting groove are provided in the middle of the outer circumference of the drive cylinder, and the fourth stop protrusion corresponds to the first guiding groove.

[0013] Further, a second guiding protrusion extending downward is provided at the lower end of the button, and a second guiding groove is provided at the upper end of the drive cylinder. The second guiding protrusion extends into the second guiding groove and they are in clearance fit for vertical sliding. The number of the second guiding protrusions is multiple and symmetrically arranged, and one second guiding protrusion corresponds to one third limiting groove.

[0014] Further, a second guiding protrusion extending downward is provided at the lower end of the button, and a second guiding groove is provided at the upper end of the drive cylinder. The second guiding protrusion extends into the second guiding groove and they are in clearance fit for vertical sliding. The number of the second guiding protrusions is multiple and symmetrically arranged, and one second guiding protrusion corresponds to one third limiting groove.

[0015] Further, the periphery of the upper end of the button is in a circular ring shape, and a plurality of reinforcing ribs are provided on the inner wall periphery of the button.

[0016] Further, a third limiting protrusion extending downward is provided at the lower end of the button, and a third limiting groove is provided at the upper end of the driving cylinder. The third limiting protrusion extends into the third limiting groove and the two are in clearance fit and slide up and down. The number of the third limiting protrusions is multiple and symmetrically arranged, and one third limiting protrusion corresponds to one third limiting groove.

[0017] Further, the upper end of the lifting spring is fixedly connected to the lower end of the driving head, and the lower end of the lifting spring is fixedly connected to the inside of the driving cylinder.

[0018] With the above technical solution, during the descending process, the lower end of the driving rib plate inside the button contacts the lifting and rotating driving surface. The lifting and rotating driving surface is a wedge-shaped surface. In the initial state of descending, the rotating positioning boss is arranged in the transverse groove of the driving cylinder. During the descending process, while the driving rod descends, it rotates. The rotating positioning boss rotates out of the corresponding transverse groove and then slides downward in the vertical groove of the driving cylinder.

[0019] Further, 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 second positioning vertical groove is provided at the lower end of the positioning conical cylinder, a stop cylinder is provided at the lower end of the positioning conical cylinder, and a first stop claw is provided on the outer ring of the stop cylinder.

[0020] Further, an inwardly concave first guiding groove that cooperates with the first guiding protrusion and the fourth stopping protrusion is provided on the inner wall of the upper end of the fixed cylinder. A protrusion corresponding to the transverse limiting groove is provided on one side of the first guiding groove. A first observation window and a second observation window are provided on the outside of the fixed cylinder. A return spring is further provided inside the fixed cylinder, and the return spring is arranged between the first positioning claw and the second positioning claw; a positioning insertion block and a positioning groove are provided at the lower end of the fixed cylinder.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects.

[0022] (1) The present invention provides a button, a fixed cylinder, a driving cylinder and a driving rod which are coaxially arranged. The driving rod moves downward through the driving cylinder under the action of the button, which can drive the blood collection needle to move downward. At the same time, under the action of the lifting spring, the blood collection needle is pressed down and reset, ensuring the timely reset of the blood collection needle after use, avoiding the situation of the needle leaking out and causing secondary puncture, with high safety and reducing the pain of the user at the same time;

[0023] (2) In the present invention, both the first positioning claw and the second positioning claw adopt a two-piece structure, and the groove that divides the circumference into two halves can fix the cross beam of the return spring. With such a structure, the purpose is to give the return spring a pre-torsion force in the circumferential direction while axially pre-compressing the return spring, and the spring rotates and resets when the button retreats;

[0024] (3) In the mating state of the present invention, the insertion rod extends into the insertion groove, ensuring the accuracy of the up-and-down movement of the driving rod relative to the driving cylinder, improving stability, with multiple guiding and limiting mechanisms to ensure the axial movement accuracy and at the same time defining the movement stroke of the button to prevent the button from disengaging from the positioning cylinder;

[0025] (4) The upper end periphery of the button of the present invention is circular in shape. Firstly, it is aesthetically pleasing. Secondly, it avoids sharp edges from hurting the operator, and at the same time facilitates the manufacture of the mold and reduces the mold cost. Moreover, multiple reinforcing ribs are provided around the inner wall of the button to enhance the strength of the button. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a schematic structural diagram of the multi-gear linear drive structure of the present invention;

[0028] Figure 2 is a schematic structural diagram of the multi-gear linear drive structure of the present invention without the fixed cylinder;

[0029] Figure 3 is the present invention Figure 2 cross-sectional view;

[0030] Figure 4 is a cross-sectional view of the multi-gear linear drive structure of the present invention without the fixed cylinder and the fixed needle cylinder;

[0031] Figure 5 is a schematic structural diagram of the driving cylinder of the present invention;

[0032] Figure 6 is a schematic structural diagram of the driving rod of the present invention;

[0033] Figure 7 is a schematic side view structural diagram of the fixed cylinder of the present invention;

[0034] Figure 8 is a schematic top view structural diagram of the fixed cylinder of the present invention;

[0035] Figure 9 is a schematic structural diagram of the button of the present invention;

[0036] Figure 10 is a schematic structural diagram of the cooperation of the button, the driving rod and the return spring of the present invention;

[0037] Figure 11 is a schematic structural diagram of the driving cylinder of the present invention;

[0038] Figure 12 It is a schematic structural diagram of the internal reset spring and the lifting spring of the present invention;

[0039] Reference numerals:

[0040] 61. Driving rod; 612. Driving head; 6121. Lifting and rotating driving surface; 6122. Rotating positioning boss; 613. Guide hollow rod; 6131. Introduction groove; 615. Second positioning claw; 62. Driving cylinder; 621. Eleventh positioning projection; 622. Introduction rod; 623. Avoidance hole; 624. Second guide groove; 6241. Vertical groove; 6242. Horizontal groove; 625. Third limiting groove; 6251. Horizontal limiting groove; 626. Twelfth positioning projection; 6261. Fourth limiting groove; 627. Fourth stopping projection; 628. Positioning conical cylinder; 6281. First positioning vertical groove; 6282. Second positioning vertical groove; 629. Stopping cylinder; 6291. First stopping claw; 63. Button; 631. First positioning claw; 632. First guiding projection; 633. Second guiding projection; 634. Third limiting projection; 6341. Fourth limiting projection; 635. Driving rib plate; 64. Lifting spring; 65. Fixed cylinder; 651. First guide groove; 652. First observation window; 653. Second observation window; 655. Reset spring; 656. Positioning plug; 657. Positioning groove; 658. Projection. Detailed implementation manners

[0041] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings.

[0042] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0043] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0044] Thirdly, it should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0047] To make the objectives, technical solutions and advantages of the present invention clearer, the following will describe in detail the specific embodiments of the present invention with reference to the drawings.

[0048] As Figures 1-12 shown, the multi-gear rotary drive structure includes a button 63, a fixed cylinder 65, a drive cylinder 62, and a drive rod 61 coaxially arranged. The button 63 is arranged inside the fixed cylinder 65 and they are coaxially arranged. The button 63 protrudes upward from the upper end of the fixed cylinder 65. At the middle position inside the button 63, there is a first positioning claw 631 extending downward. The first positioning claw 631 is a two-lobe structure. The drive cylinder 62 is arranged below the button 63 and inside the inner circle of the fixed cylinder 65. The lower end of the drive rod 61 extends into the drive cylinder 62, and the upper end of the drive rod 61 extends out of the drive cylinder 62. At the upper end of the drive rod 61, there is a second positioning claw 615. The second positioning claw 615 corresponds to the first positioning claw 631 and is also a two-lobe structure. A return spring 655 is arranged between the first positioning claw 631 and the second positioning claw 615. With such a structure, it is convenient for positioning both ends of the return spring 655. The drive cylinder 62 is provided with an avoidance hole 623 to facilitate the up and down movement of the drive rod 61.

[0049] The interior of the driving cylinder 62 has a hollow structure. At the lower end inside the driving cylinder 62, there is an annular eleventh positioning protrusion 621. At the lower end of the driving cylinder 62, there is an upwardly extending guiding rod 622. The upper end of the guiding rod 622 has a conical structure, which is convenient for guiding and improves the assembly efficiency. The driving rod 61 includes a driving head 612 at the upper end and a guiding hollow rod 613 at the lower end. The second positioning claw 615 is provided at the upper end of the driving head 612. The guiding hollow rod 613 is coaxially arranged with the driving head 612. The guiding hollow rod 613 is provided at the lower end of the driving head 612 and extends vertically downward. An inlet groove 6131 is provided inside the guiding hollow rod 613. In the mating state, the guiding rod 622 extends into the inlet groove 6131 to ensure the accuracy of the vertical movement of the driving rod 61 relative to the driving cylinder 62 and improve the stability. Between the lower end of the driving head 612 and the eleventh positioning protrusion 621, there is a lifting spring 64. The lifting spring 64 is provided on the outer ring of the eleventh positioning protrusion 621 and they are coaxially arranged. The guiding hollow rod 613 is coaxially arranged with the lifting spring 64. When the button 63 moves downward, a pre-pressure is generated on the return spring 655 between the first positioning claw 631 and the second positioning claw 615, generating forces in both the axial and circumferential directions. The upper end of the lifting spring 64 is fixedly connected to the lower end of the driving head 612, and the lower end of the lifting spring 64 is fixedly connected to the interior of the driving cylinder 62. Inside the button 63, there is a driving rib 635. The lifting and rotating driving surface 6121 on the driving rod 61 is a wedge surface. In the initial state, the rotating positioning boss 6122 is arranged in the transverse groove 6242 of the driving cylinder 62, and the driving rod 61 does not rotate or move axially. During the downward movement, when the lower end of the driving rib 635 contacts the lifting and rotating driving surface 6121 of the driving rod 61, the driving rod 61 starts to rotate, and the rotating positioning boss 6122 rotates out of the corresponding transverse groove 6242 and then slides downward in the vertical groove 6241 of the driving cylinder 62. When resetting, the lifting spring 64 and the return spring 655 cause the driving rod 61 to retract axially. 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 torque of the return spring 655, and the rotating positioning boss 6122 rotates into the transverse groove 6242 of the driving cylinder 62, returning to the initial position before firing.

[0050] Combined Figure 9As shown, a first guiding protrusion 632 is provided on the outer ring below the button 63, and a concave first guiding groove 651 is provided on the inner wall of the upper end of the fixed cylinder 65. The first guiding protrusion 632 extends into the first guiding groove 651 and the two are in clearance fit for up and down sliding. During installation, the first guiding protrusion 632 and the first guiding groove 651 play a guiding role to achieve rapid assembly and positioning. The number of the first guiding protrusions 632 is multiple, and one first guiding protrusion 632 corresponds to one first guiding groove 651, with a symmetrical structure and balanced force; a second guiding protrusion 633 extending downward is provided at the lower end of the button 63, and a third limiting groove 625 is provided at the upper end of the driving cylinder 62. The second guiding protrusion 633 extends into the third limiting groove 625 and the two are in clearance fit for up and down sliding. During installation, the second guiding protrusion 633 and the third limiting groove 625 play a guiding role to achieve rapid assembly and positioning, and at the same time ensure the accuracy of the up and down movement of the button 63 relative to the driving cylinder 62, limit the downward movement distance of the button 63, and play a role of stopping. The button 63 stops moving downward when the second guiding protrusion 633 contacts the bottom of the third limiting groove 625; the number of the second guiding protrusions 633 is multiple, and one second guiding protrusion 633 corresponds to one third limiting groove 625, with a symmetrical structure and balanced force; a third limiting protrusion 634 extending downward is provided at the lower end of the button 63, and a fourth limiting groove 6261 is provided at the upper end of the driving cylinder 62. The third limiting protrusion 634 extends into the fourth limiting groove 6261 and the two are in clearance fit for up and down sliding. During installation, the third limiting protrusion 634 and the fourth limiting groove 6261 play a guiding role to achieve rapid assembly and positioning, and at the same time ensure the accuracy of the up and down 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 settings achieve multiple guiding and positioning in the axial direction, improve the up and down movement accuracy between the parts with a mating relationship, limit the stop of the button 63 moving upward, and prevent the button 63 from disengaging from the fixed cylinder 65.

[0051] The first guiding protrusion 632 and the second guiding protrusion 633 are arranged between two third limiting protrusions 634. The lower end of the third limiting protrusion 634 is T-shaped, and fourth limiting protrusions 6341 extending in the circumferential direction are symmetrically provided on both sides of the lower end of the third limiting protrusion 634. The span between the two fourth limiting protrusions 6341 provided 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 return stroke of the button 63 and prevents the button 63 from disengaging from the fixed cylinder 65 when released.

[0052] The upper end of the driving cylinder 62 is provided with a twelfth positioning protrusion 626 extending outwards. In the upper limit position, the upper end surface of the fourth limiting protrusion 6341 is in contact with the lower end surface of the twelfth positioning protrusion 626 to position the upper limit position of the button 63 and prevent the button 63 from disengaging from the fixed cylinder 65 when the hand is released.

[0053] The periphery of the upper end of the button 63 is circular in shape. One is for aesthetics, the other is to avoid sharp edges from hurting the operator, and at the same time it is convenient for the manufacture of the mold and reduces the mold cost; multiple reinforcing ribs are provided around the inner wall of the button 63 to enhance the strength of the button 63.

[0054] The middle part of the outer circle of the driving cylinder 62 is provided with a fourth stopping protrusion 627. The fourth stopping protrusion 627 is correspondingly arranged with the first guiding groove 651. When installing the driving cylinder 62 relative to the fixed cylinder 65, it is convenient for the circumferential positioning of the two, prevents the driving cylinder 62 from rotating, and at the same time ensures the vertical movement accuracy in the axial direction of the two.

[0055] A transverse limiting groove 6251 is also provided outside the driving cylinder 62. The transverse limiting groove 6251 is correspondingly arranged with the protrusion 658 inside the fixed cylinder 65. During assembly, the protrusion 658 undergoes elastic deformation, and then the protrusion 658 is stuck in the transverse limiting groove 6251 to realize the installation of the driving cylinder 62 and the fixed cylinder 65.

[0056] 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 the production cost during mass production. The thickness of the fixed cylinder 65 is gradually increased from top to bottom. One is to increase the strength, and the other is to facilitate demolding, which reduces the mold cost to a certain extent.

[0057] The lower end of the driving cylinder 62 is provided with a positioning conical cylinder 628. The upper end of the positioning conical cylinder 628 is provided with a first positioning vertical groove 6281, and the lower end of the positioning conical cylinder 628 is provided with a second positioning vertical groove 6282. 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 circle of the stop cylinder 629. The fixed cylinder 65 is provided with a first observation window 652 and a second observation window 653.

[0058] The principle of the lifting process:

[0059] When the button 63 moves downward, the reset spring 655 is compressed, and at the same time, the reset spring 655 stores energy. 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 pre-torsion force of the reset spring 655. The driving cylinder 62 does not rotate and there is no axial movement. The reset 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 disengages from the transverse groove 6242, the driving rod 61 moves downward to fire under the action of the energy-stored reset spring 655, and at the same time, stores energy for the lifting spring 64. During the firing process, the front end of the driving rod 61 impacts 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 reset spring 655 is stretched to store energy. After the driving rod 61 impacts the blood collection needle, it quickly retracts under the action of the lifting spring 64 and the reset spring 655. The driving rod 61 retracts to the bottom of the driving cylinder 62, and under the action of the torsion force of the reset spring 655, the rotation positioning bosses 6122 on both sides of the driving rod 61 rotate into the transverse groove 6242 of the driving cylinder 62 and return to the initial position of firing.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. Multi-gear linear drive structure, characterized in that, It includes a coaxially arranged button (63), a fixed cylinder (65), a driving cylinder (62) and a driving rod (61). The button (63) is arranged inside the upper end of the fixed cylinder (65) and the two are arranged to slide up and down. The driving cylinder (62) is arranged inside the fixed cylinder (65), and the driving rod (61) is arranged inside the driving cylinder (62); A plurality of reinforcing ribs are arranged around the inner wall of the button; At the middle position inside the button (63), there is a first positioning claw (631) extending downward. Inside the button (63), there is a driving rib plate (635). On the outer ring of the lower part of the button (63), there is a first guiding protrusion (632). At the lower end of the button (63), there are a second guiding protrusion (633) and a third limiting protrusion (634) extending downward. The second guiding protrusion (633) and the third limiting protrusion (634) are arranged at intervals; The first guiding protrusion (632) and the second guiding protrusion (633) are arranged between two third limiting protrusions (634). On both sides of the lower end of the third limiting protrusion (634), there are symmetrically arranged fourth limiting protrusions (6341) extending in the circumferential direction; At the lower end of the driving cylinder (62), there is a positioning conical cylinder (628). At the lower end of the positioning conical cylinder (628), there is a stop cylinder (629). On the driving cylinder (62), there is an avoidance hole (623). In the middle of the outer ring of the driving cylinder (62), there is a fourth stop protrusion (627). At the upper end of the driving cylinder (62), there is a twelfth positioning protrusion (626) extending outward. At the lower end inside the driving cylinder (62), there is an annular eleventh positioning protrusion (621). At the lower end of the driving cylinder (62), there is an introducing rod (622) extending upward. The upper end of the introducing rod (622) is conical. On the driving cylinder (62), there are a second guiding groove (624) and a third limiting groove (625) matching with the second guiding protrusion (633); Adjacent twelfth positioning protrusions (626) form a fourth limiting groove (6261). The fourth limiting groove (6261) is in clearance fit with the third limiting protrusion (634). At the upper end of the positioning conical cylinder (628), there is a first positioning vertical groove (6281). At the lower end of the positioning conical cylinder (628), there is a second positioning vertical groove (6282). On the outer ring of the stop cylinder (629), there is a first stop claw (6291).

2. The multi-gear linear drive structure according to claim 1, characterized in that, The lower end of the third limiting protrusion (634) is T-shaped. 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).

3. The multi-gear linear drive structure according to claim 2, characterized in that On the driving cylinder (62), there is also a vertical groove (6241) perpendicular and penetrating to the transverse groove (6242) and a transverse limiting groove (6251).

4. The multi-gear linear drive structure according to claim 3, wherein, The driving rod (61) includes a driving head (612) at the upper end and a guiding hollow rod (613) at the lower end. The guiding hollow rod (613) is coaxially arranged with the driving head (612). The guiding hollow rod (613) is arranged at the lower end of the driving head (612) and extends vertically downward. An introducing groove (6131) adapted to the size of the introducing rod (622) is provided inside the guiding hollow rod (613). A second positioning claw (615) corresponding to the first positioning claw (631) is provided at the upper end of the driving rod (61). A lifting and rotating driving surface (6121) and a rotating positioning boss (6122) adapted to the size of the second guiding groove (624) are provided on the driving head (612).

5. The multi-gear linear drive structure according to claim 4, characterized in that A lifting spring (64) is provided between the lower end of the driving head (612) and the eleventh positioning protrusion (621). 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 lifting spring (64) is arranged on the outer ring of the eleventh positioning protrusion (621) and they are coaxially arranged. The guiding hollow rod (613) is coaxially arranged with the lifting spring (64).

6. The multi-gear linear drive structure according to claim 5, wherein, The inner wall of the upper end of the fixed cylinder (65) is provided with a concave first guiding groove (651) that cooperates with the first guiding protrusion (632) and the fourth stop protrusion (627). A protrusion (658) corresponding to the lateral limiting groove (6251) is provided on one side of the first guiding groove (651). A first observation window (652) and a second observation window (653) are provided on the outside of the fixed cylinder (65). A return spring (655) is further provided inside the fixed cylinder (65). The return spring (655) is arranged between the first positioning claw (631) and the second positioning claw (615). A positioning plug (656) and a positioning groove (657) are provided at the lower end of the fixed cylinder (65).

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