Locking mechanism and portable infusion pump

Abstract

The utility model discloses a locking mechanism and a portable infusion pump. The locking mechanism comprises a shaft bracket, a lock hook is rotatably mounted on the shaft bracket, a lock shaft is mounted on the shaft bracket on the side surface of the lock hook, and a lock cylinder is rotatably mounted in the lock shaft; the lock further comprises a key, a long through hole is formed in the lock shaft, the head of the key penetrates through the long through hole and then is assembled in the lock groove of the lock cylinder, and during unlocking, the head of the key and the long through hole form an angle, and the lock groove and the long through hole form an angle. The key drives the lock cylinder to rotate through the head until the lock cylinder abuts against the lock hook to achieve locking. In actual use, unlocking or locking operation is achieved by assembling the key and the lock cylinder lock groove in the lock shaft, mistaken touch and even misoperation are effectively avoided by arranging the lock cylinder in the lock shaft, the key is effectively prevented from being separated from the lock cylinder in the unlocking state, actual use is greatly facilitated, and practicability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of infusion pumps, in particular to a locking mechanism and a portable infusion pump. Background Art

[0002] Portable infusion pumps are used for patients or parturients with pain caused by various reasons and who need continuous, intermittent or timed infusion of liquid medicine, and can also be used for chemotherapy administration to cancer patients; the portable infusion pump is used in cooperation with a disposable liquid storage box, and the administration route is intravenous or epidural cavity.

[0003] When the liquid storage box is assembled with the infusion pump, the hook of the liquid storage box is inserted into the infusion pump, and as the infusion pump and the infusion box rotate closer, the hook is hooked onto the locking hook inside the infusion pump. In the existing use process, the following situations are very likely to occur: 1) The lock shaft assembled and unlocked with the key is exposed, and it is very easy for the user or the patient to accidentally touch the lock shaft, and even cause the lock shaft to rotate and generate an unlocking misoperation, seriously affecting the normal use of the infusion pump; 2) Considering the operability, a pre-tightening spring kept in a compressed state is usually assembled between the lock shaft and the locking hook, and the liquid storage box can be assembled even when the lock shaft is not rotated to the locking position. However, due to the lack of locking, it will fall off due to external force interference during actual use, resulting in a self-flow phenomenon; 3) Forgetting to lock, especially for unfamiliar users, it is very easy to cause medical accidents due to not locking. Summary of the Utility Model

[0004] To solve the above problems, the present application provides a locking mechanism and a portable infusion pump with a reasonable structure, thereby effectively avoiding accidental touch and even misoperation of the lock core, and being able to effectively prevent the key from detaching from the lock core in the unlocked state, greatly facilitating actual use and having good practicability.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A locking mechanism includes an axle bracket, a locking hook is rotatably installed on the axle bracket, a lock shaft is installed on the axle bracket on the side of the locking hook, and a lock core is rotatably installed inside the lock shaft; it also includes a key, a long through hole is opened on the lock shaft, the head of the key passes through the long through hole and is assembled into the lock groove of the lock core. When unlocking, the head of the key and the lock groove both form an angle with the long through hole.

[0007] As a further improvement of the above technical solution:

[0008] A convex pin is radially inserted on the circumferential wall surface of the lock core, a sliding groove for the convex pin to extend outwards and slide relatively is opened on the lock shaft, and the rotation angle of the lock core relative to the lock shaft is limited by a rotation limiting structure; the matching of the convex pin and the sliding groove enables the lock shaft and the lock core to be synchronously limited and moved axially relative to the axle bracket.

[0009] An elastic member is installed between the lock core and the lock hook, and the side surface of the shaft frame is concave to form groove one and groove two, and the concave depth of groove one is smaller than the concave depth of groove two; when in the locked state, the convex pin is limited to be located in groove one, and the elastic member is in a compressed state; when in the unlocked state, the convex pin is limited to be located in groove two, and the elastic member is in a natural state.

[0010] The lock shaft is formed of a small shaft section and a large shaft section via a step surface arranged along the circumferential direction, and a circular hole is provided on the shaft frame for inserting and accommodating the small shaft section; the step surface and the convex pin respectively constitute the limit for the axial movement of the lock shaft relative to the shaft frame; a convex ridge is formed on the outer wall surface of the small shaft section along the axial direction, and a long groove matching the convex ridge is provided on the wall surface of the circular hole.

[0011] The long through hole, the lock slot and the key head are adapted in shape, and all include a circular portion at the center, and both sides of the circular portion extend radially outward to form a long strip structure.

[0012] A neck is provided between the long strip structure of the key head and the key handle, and the cross-sectional dimension of the neck is not greater than the cross-sectional dimension of the circular portion; when the key is fitted into the lock core, the head is embedded in the lock slot, and the neck is located at the long through hole.

[0013] The lock core is axially mounted inside the lock shaft, a protruding arm is extended toward the lock hook at one end edge of the lock core, and a lock groove having the same shape as the long through hole is opened at the other end of the lock core.

[0014] The side surface of the lock hook facing the lock core protrudes outwardly and extends to form an abutment surface, which abuts against the convex arm; the abutment surface facing the rotation direction of the convex arm is set as an inclined surface.

[0015] The bottom end of the lock hook extends away from the abutting surface to form a hook portion matched with the hook hanging, and the bottom surface of the hook portion is arranged as an inclined surface.

[0016] A portable infusion pump comprises the locking mechanism described in any one of the above, and also comprises a rotatably mounted liquid storage box and a driving pump, wherein a baffle is installed on the top surface of the liquid storage box, the baffle extends upward to form a hook, a bracket is installed on the bottom surface of the driving pump, an axle frame is installed inside the driving pump above the bracket, and the upper end of the locking hook is rotatably mounted on the axle frame via a rotating shaft; one end of the driving pump and the facing surface of the liquid storage box are rotatably mounted via a rotating pin, and after the facing surfaces are fitted together, the hook at the other end is fitted into the locking hook to achieve locking.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model realizes unlocking or locking operation by assembling the key and the lock core lock groove in the lock shaft. By internalizing the lock core, it effectively avoids the accidental touch or even misoperation of the lock core, and can effectively prevent the key from falling out of the lock core in the unlocked state, and also avoids the occurrence of forgetting to lock, which is greatly convenient for actual use, ensures the safety of use, and has good practicality.

[0019] The utility model also has the following advantages:

[0020] The lock core and the lock shaft are rotatably assembled, and the assembly of the convex pin and the slide groove provides a guide for the rotation of the lock core relative to the lock shaft, effectively ensuring that the key triggers the rotation of the lock core and the smooth switching operation between the locked and unlocked states;

[0021] By providing a long through hole on the lock shaft that matches the shape of the lock slot and the key head, the key head can smoothly pass through the lock shaft and be fitted to the built-in lock slot of the lock core to achieve the locking and unlocking switching operation; by setting the lock slot, the key head and the long through hole as long strip structures, and providing a neck between the key head and the handle, after the head passes through the long through hole and is fitted into the lock slot, as the key rotates, the lock slot, the key head and the long through hole form an angle, effectively preventing the key head from falling off from the lock slot without reason;

[0022] The lock core moves axially with the lock shaft relative to the shaft frame, so that the elastic member is in a natural state when in the unlocked state, which is convenient for the hook to be hung or detached from the lock hook; while in the locked state, the elastic member is in a compressed state, effectively ensuring the structural reliability of the lock shaft relative to the shaft frame;

[0023] In actual operation, whether unlocking or locking, the key needs to apply axial force to the lock core and lock shaft to move axially, so that the convex pin disengages from groove one or groove two, and then the key can be turned, effectively avoiding accidental contact with the key and lock shaft and driving them to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 It is an exploded view of the utility model.

[0026] Figure 3 It is a structural schematic diagram of the key of the utility model.

[0027] Figure 4 The utility model is a schematic diagram of the assembly of the lock shaft and the lock core.

[0028] Figure 5 The utility model is a schematic diagram of the installation of the lock shaft and the lock core on the shaft frame.

[0029] Figure 6 This is a schematic diagram of the state of the present utility model before locking.

[0030] Figure 7 This is a schematic diagram of the present utility model in the locked state.

[0031] Among them: 1. Baffle; 2. Bracket; 3. Rotating shaft; 4. Lock shaft; 5. Key; 6. Shaft bracket; 7. Lock hook; 8. Elastic member; 9. Lock core; 10. Rotating pin;

[0032] 11. Hook;

[0033] 41. Slide groove; 42. Long through hole; 43. Step surface; 44. Convex rib;

[0034] 51. Head; 52. Neck; 53. Handle;

[0035] 61. Long groove; 62. Blocking surface; 63. First groove; 64. Second groove;

[0036] 71. Contact surface; 72. Boss;

[0037] 90. Convex pin; 91. Lock groove; 92. Convex arm; 93. Counterbore. Specific embodiments

[0038] The following will describe the specific embodiments of the present utility model with reference to the accompanying drawings.

[0039] As Figure 1 and Figure 2 shown, a locking mechanism of this embodiment includes a shaft bracket 6, on which a lock hook 7 is rotatably installed, a lock shaft 4 is installed on the shaft bracket 6 on the side of the lock hook 7, and a lock core 9 is rotatably installed in the lock shaft 4; it further includes a key 5, a long through hole 42 is formed in the lock shaft 4, the head 51 of the key 5 passes through the long through hole 42 and is fitted into the lock groove 91 of the lock core 9. When unlocking, the head 51 of the key 5 and the lock groove 91 both form an angle with the long through hole 42, effectively preventing the head 51 from disengaging from the lock groove 91.

[0040] In this embodiment, the key 5 drives the lock core 9 to rotate through the head 51 until the lock core 9 abuts against the lock hook 7 to achieve locking.

[0041] In this embodiment, the unlocking or locking operation is realized by the fitting of the key 5 and the lock groove 91 of the lock core 9 in the lock shaft 4. By embedding the lock core 9, the accidental touch or even accidental operation of the lock core 9 is effectively avoided, and the key 5 can be effectively prevented from disengaging from the lock core 9 in the unlocked state.

[0042] On the circumferential wall surface of the lock core 9, a protruding pin 90 is inserted radially. A sliding groove 41 for the protruding pin 90 to extend outwards and slide relatively is formed on the lock shaft 4. The rotation angle of the lock core 9 relative to the lock shaft 4 is limited by a rotation limiting structure; the matching of the protruding pin 90 and the sliding groove 41 enables the lock shaft 4 and the lock core 9 to be limited and move synchronously relative to the shaft bracket 6 in the axial direction.

[0043] In this embodiment, the lock core 9 is rotationally matched with the lock shaft 4, and through the matching of the protruding pin 90 and the sliding groove 41, it provides a guiding function for the rotation of the lock core 9 relative to the lock shaft 4; moreover, the matching of the protruding pin 90 and the sliding groove 41 enables the lock shaft 4 and the lock core 9 to move synchronously in the axial direction while being able to rotate relative to each other in the circumferential direction.

[0044] In this embodiment, the arc angle of the sliding groove 41 is the same as the rotation angle of the key 5 driving the lock core 9 to rotate. The rotation angle of the lock core 9 is restricted by the sliding groove 41, effectively ensuring the smooth switching operation between the locked and unlocked states when the lock core is triggered to rotate by the key 5.

[0045] In this embodiment, the inner side surface of the shaft bracket 6 is concave, and a space for the protruding pin 90 to rotate relatively is formed between the two side blocking surfaces 62. The blocking surfaces 62 constitute a rotation limiting structure for the protruding pin 90 and the lock core 9 to rotate relative to the shaft bracket 6.

[0046] An elastic member 8 is installed between the lock core 9 and the lock hook 7. As Figure 5 shown, a groove one 63 and a groove two 64 are formed by the concave of the side surface of the shaft bracket 6. The concave depth of the groove one 63 is less than that of the groove two 64; when in the locked state, the protruding pin 90 rotates with the lock core 9 and is received and limited in the groove one 63, and the elastic member 8 is in a compressed state; when in the unlocked state, the protruding pin 90 rotates with the lock core 9 and is received and limited in the groove two 64, and the elastic member 8 is in a natural state.

[0047] In this embodiment, the groove one 63 and the groove two 64 are respectively located at the two side blocking surfaces 62. When the protruding pin 90 rotates relative to the shaft bracket 6 to the two side blocking surfaces 62, the protruding pin 90 will be fitted into the corresponding groove one 63 or groove two 64 under the elastic action of the elastic member 8.

[0048] In actual operation, whether unlocking or locking, an axial force needs to be applied to the lock core 9 and the lock shaft 4 through the key 5 to move axially, so that after the protruding pin 90 disengages from the groove one 63 or the groove two 64, the key 5 can be rotated, effectively avoiding the accidental touch of the key 5 and the lock shaft 4 to drive them to rotate.

[0049] In this embodiment, the concave depth of the first groove 63 is less than that of the second groove 64. Thus, in the unlocked state, the convex pin 90 can be fitted into the second groove 64 with a larger depth, and the axial space of the elastic member 8 is relatively large so that it can extend to the natural state. While in the locked state, the convex pin 90 is fitted into the first groove 63 with a smaller depth, and the axial space of the elastic member 8 is relatively small and in a compressed state. The elastic member 8 applies an elastic force to the lock core 9 and the lock shaft 4 axially relative to the lock hook 7 and the shaft bracket 6.

[0050] The lock core 9 moves axially relative to the shaft bracket 6 along with the lock shaft 4, so that in the unlocked state, the elastic member 8 is in the natural state, facilitating the hanging or detachment of the hook 11 relative to the lock hook 7. While in the locked state, the elastic member 8 is in the compressed state, effectively ensuring the structural reliability of the lock shaft 4 relative to the shaft bracket 6. At the same time, the arrangement of the elastic member 8 endows the rotation of the lock hook 7 relative to the shaft bracket 6 with a flexible elastic buffer, ensuring and enhancing the user experience.

[0051] In this embodiment, a boss 72 for sleeving one end of the elastic member 8 can be formed by extending on the side surface of the lock hook 7, and a counterbore 93 for accommodating the other end of the elastic member 8 is recessed in the end surface of the lock core 9, thereby realizing the installation of the elastic member 8 between the lock hook 7 and the lock core 9.

[0052] The lock shaft 4 is composed of a small shaft section and a large shaft section via a stepped surface 43 arranged along the circumferential direction, and a circular hole for inserting and accommodating the small shaft section is provided on the shaft bracket 6. The stepped surface 43 restricts the axial inward movement of the lock shaft 4 relative to the shaft bracket 6, while the convex pin 90 restricts the axial outward movement of the lock shaft 4 relative to the shaft bracket 6. Thus, the stepped surface 43 and the convex pin 90 respectively constitute the limits for the axial movement of the lock shaft 4 relative to the shaft bracket 6. As Figure 4 shown, a convex rib 44 is formed by extending axially on the outer wall surface of the small shaft section, and a long groove 61 adapted to the convex rib 44 is provided on the wall surface of the circular hole. Thus, a reliable installation between the lock shaft 4 and the shaft bracket 6 is realized, which is convenient and stable to operate, and effectively prevents the rotation of the lock shaft 4 relative to the shaft bracket 6.

[0053] In this embodiment, through the installation of the lock shaft 4 on the shaft bracket 6, the built-in of the lock core 9 is effectively realized, playing a protective role for the lock core 9. Especially during use, the rotation misalignment of the lock core 9 relative to the lock shaft 4 is used to prevent the key 5 from falling off.

[0054] The lock shaft 4 in this embodiment not only realizes the built-in installation of the lock core 9, but also guides the rotation of the lock core 9 and limits the rotation angle, effectively ensuring the reliability of the unlocking and locking operations.

[0055] The shapes of the long through hole 42, the lock groove 91 and the head 51 of the key 5 are adapted, and all include a circular part at the center, and strip-shaped structures extend radially outward on both sides of the circular part.

[0056] In this embodiment, a long through hole 42 adapted to the shapes of the lock groove 91 and the head 51 of the key 5 is formed in the lock shaft 4, so that the head 51 of the key 5 can smoothly pass through the lock shaft 4 and be fitted onto the lock groove 91 of the built-in lock core 9 to achieve the switching operation of locking and unlocking.

[0057] As Figure 3 shown, a neck 52 is provided between the strip-shaped structure of the head 51 of the key 5 and the handle 53 of the key 5, and the cross-sectional dimension of the neck 52 is not greater than that of the circular part; when the key 5 is fitted into the lock core 9, the head 51 is fitted into the lock groove 91, and the neck 52 is located at the long through hole 42.

[0058] In this embodiment, by setting the lock groove 91, the head 51 of the key 5 and the long through hole 42 as strip-shaped structures, and providing a neck 52 between the head 51 and the handle 53 of the key 5, after the head 51 passes through the long through hole 42 and is fitted into the lock groove 91, as the key 5 rotates, both the lock groove 91 and the head 51 of the key 5 form an angle with the long through hole 42, effectively preventing the head 51 of the key 5 from falling off the lock groove 91 without reason.

[0059] In this embodiment, by setting the head 51 of the key 5 as a special structure, the risk of misusing the key is effectively reduced.

[0060] The lock core 9 is axially fitted inside the lock shaft 4. A convex arm 92 extends from one end edge of the lock core 9 towards the lock hook 7 to abut against the lock hook 7; a lock groove 91 having the same shape as the long through hole 42 is formed at the other end of the lock core 9.

[0061] A contact surface 71 protrudes and extends from the side of the lock hook 7 facing the lock core 9. The contact surface 71 abuts against the convex arm 92 to achieve the locking of the lock hook 7; the contact surface 71 facing the rotation direction of the convex arm 92 is set as an inclined surface, effectively ensuring the smooth contact between the convex arm 92 and the contact surface 71 during the rotation of the lock core 9.

[0062] A hook portion that is hung and matched with the hanging hook 11 extends from the bottom end of the lock hook 7 away from the contact surface 71, and the bottom surface of the hook portion is set as an inclined surface.

[0063] In this embodiment, the contact surface 71 and the hook portion are arranged on two opposite sides of the lock hook 7, so that the reverse rotation of the lock hook 7 can be effectively prevented through the abutting force at the contact surface 71, and the reliability of locking is achieved and ensured.

[0064] The bottom surface of the hook portion is set as an inclined surface, which is convenient for applying a forced rotation force to the lock hook 7 via the inclined surface when the hanging hook 11 is fitted onto the hook portion from bottom to top, so that the lock hook 7 rotates to achieve the hanging of the hanging hook 11.

[0065] This embodiment also provides a portable infusion pump, which includes the locking mechanism of any one of the above, and further includes a rotatably assembled liquid storage box and a driving pump. A baffle 1 is installed on the top surface of the liquid storage box, and a hook 11 extends upward from the baffle 1. A bracket 2 is assembled on the bottom surface of the driving pump. A shaft bracket 6 is installed inside the driving pump above the bracket 2. The upper end of the locking hook 7 is rotatably installed on the shaft bracket 6 through a rotating shaft 3. One end of the opposite surfaces of the driving pump and the liquid storage box is rotatably assembled via a rotating pin 10. After the opposite surfaces are attached, they are assembled into the locking hook 7 via the hook 11 at the other end to achieve locking.

[0066] The usage method of the present utility model includes a locking process and an unlocking process. The locking process is the process of locking and fixing the liquid storage box relative to the driving pump, and the unlocking process is the process of releasing the locking between the liquid storage box and the driving pump.

[0067] The locking process is as follows:

[0068] When in the unlocked state, the elastic member 8 is in its natural state. The hook 11 is pushed upward into the locking hook 7, forcing the locking hook 7 to rotate relative to the shaft bracket 6 so that the hook 11 is hooked in, as Figure 6 shown. At this time, the elastic member 8 is not stressed, and the hook 11 can be relatively easily pushed into the locking hook 7. After the hook 11 is hooked to the locking hook 7, the locking hook 7 and the elastic member 8 are reset. Axially push inward by the key 5 to overcome the axial elastic force of the elastic member 8, driving the lock core 9 and the lock shaft 4 to axially move inward relative to the shaft bracket 6. The elastic member 8 is axially compressed, and the convex pin 90 disengages from the groove two 64. At the same time, rotate the key 5. The head 51 of the key 5 drives the lock core 9 to rotate. The convex arm 92 of the lock core 9 abuts against the abutting surface 71 of the locking hook 7, making the locking hook 7 unable to rotate relative to the shaft bracket 6, as Figure 7 shown, reaching the locked state. At the same time, under the action of the compression elastic force of the elastic member 8, the convex pin 90 is driven to be accommodated in the groove one 63. At this time, the head 51 of the key 5 and the lock groove 91 of the lock core 9 are both aligned with the long through hole 42 of the lock shaft 4, and the key 5 can be pulled out from the lock core 9.

[0069] In this embodiment, during the actual locking operation, if the hook 11 fails to be fully hooked into the locking hook 7, the locking hook 7 will not be able to reset, and when rotating the key 5 for locking, the lock core 9 will also not be able to rotate in place due to the convex arm 92. Only when the hook 11 is fully hooked into the locking hook 7 can the lock core 9 rotate smoothly until the convex arm 92 abuts against the abutting surface 71 of the locking hook 7, and the key 5 can be rotated to the preset position and pulled out from the lock core 9, effectively ensuring reliable locking in actual use.

[0070] The unlocking process is as follows:

[0071] The head 51 of the key 5 is passed through the long through hole 42 of the lock shaft 4 and fitted into the lock groove 91 of the lock core 9. A slight axial force is applied to cause the protruding pin 90 to disengage from the groove 63 of the shaft frame 6. At the same time, the key 5 is rotated, the lock core 9 rotates, and the protruding arm 92 disengages from the abutting surface 71, thereby releasing the abutting state between the lock core 9 and the lock hook 7. Figure 6 As shown, the protruding pin 90 is accommodated in the groove 64 of the shaft frame 6 under the action of the elastic member 8, and the elastic member 8 is changed from compression to a natural state; under the gravity of the hook 11 itself, the baffle 1, and the liquid storage box, the hook 11 acts on the contact surface with the lock hook 7, prompting the lock hook 7 to rotate and unlock; in the process of the hook 11 disengaging from the lock hook 7, an external force can also be applied to prompt it to disengage, such as pulling the liquid storage box downward, and the external force combined with gravity helps to disengage and unlock.

[0072] When the lock core 9 and the lock hook 7 are in a locked state, the key 5 head 51, the long through hole 42 of the lock shaft 4, and the lock groove 91 of the lock core 9 are located on the same straight line. The key 5 can be removed from the lock core 9 via the lock shaft 4, and the elastic member 8 is in a compressed state.

[0073] When the lock cylinder 9 is released from the abutment state with the lock hook 7, an angle is formed between the head 51 of the key 5 inserted in the lock groove 91 of the lock cylinder 9 and the long through hole 42 of the lock shaft 4, and they are not directly opposite, so that the head 51 of the key 5 is limited by the long through hole 42 of the lock shaft 4 and cannot be removed from the lock cylinder 9, and the elastic member 8 is in a natural state.

[0074] The utility model effectively avoids accidental touching or even misoperation of the lock core by embedding the lock core, and can effectively prevent the key from falling out of the lock core in the unlocked state, while also avoiding the occurrence of forgetting to lock the door, which is greatly convenient for actual use, ensures safety in use, and has good practicality.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A locking mechanism, characterized in that: The invention comprises an axis frame (6), a lock hook (7) is rotatably mounted on the axis frame (6), a lock shaft (4) is mounted on the axis frame (6) at the side of the lock hook (7), and a lock core (9) is rotatably mounted in the lock shaft (4); and a key (5) is also included, a long through hole (42) is opened on the lock shaft (4), a head (51) of the key (5) passes through the long through hole (42) and is fitted into a lock groove (91) of the lock core (9), and when unlocking, the head (51) of the key (5) and the lock groove (91) both form an angle with the long through hole (42).

2. A locking mechanism according to claim 1, characterized in that: A convex pin (90) is inserted radially on the circumferential wall surface of the lock core (9); a slide groove (41) is provided on the lock shaft (4) for the convex pin (90) to extend outward and slide relatively; the rotation angle of the lock core (9) relative to the lock shaft (4) is limited by a rotation limiting structure; the assembly of the convex pin (90) and the slide groove (41) enables the lock shaft (4) and the lock core (9) to synchronously move relative to the shaft frame (6) in the axial direction.

3. A locking mechanism according to claim 2, characterized in that: An elastic member (8) is installed between the lock core (9) and the lock hook (7), and the side surface of the shaft frame (6) is concave to form a first groove (63) and a second groove (64), and the concave depth of the first groove (63) is smaller than the concave depth of the second groove (64); when in a locked state, the convex pin (90) is accommodated within the first groove (63), and the elastic member (8) is in a compressed state; when in an unlocked state, the convex pin (90) is accommodated within the second groove (64), and the elastic member (8) is in a natural state.

4. A locking mechanism according to claim 2, characterized in that: The lock shaft (4) is formed into a small shaft section and a large shaft section via a step surface (43) arranged along the circumferential direction, and a circular hole for inserting and accommodating the small shaft section is provided on the shaft frame (6); the step surface (43) and the convex pin (90) respectively constitute the limit for the axial movement of the lock shaft (4) relative to the shaft frame (6); a convex ridge (44) is formed on the outer wall surface of the small shaft section along the axial direction, and a long groove (61) adapted to the convex ridge (44) is provided on the wall surface of the circular hole.

5. A locking mechanism according to claim 1, characterized in that: The long through hole (42), the lock slot (91) and the key (5) head (51) are adapted in shape and all include a circular portion at the center, with both sides of the circular portion extending radially outward to form a long strip structure.

6. A locking mechanism according to claim 5, characterized in that: A neck (52) is provided between the long strip-shaped structure of the head (51) of the key (5) and the handle (53) of the key (5), and the cross-sectional dimension of the neck (52) is not greater than the cross-sectional dimension of the circular portion; when the key (5) is fitted into the lock cylinder (9), the head (51) is embedded in the lock groove (91), and the neck (52) is located at the long through hole (42).

7. A locking mechanism according to claim 1, characterized in that: The lock core (9) is axially mounted inside the lock shaft (4), one end edge of the lock core (9) is provided with a protruding arm (92) extending toward the lock hook (7), and the other end of the lock core (9) is provided with a lock groove (91) having the same shape as the long through hole (42).

8. A locking mechanism according to claim 7, characterized in that: The side surface of the lock hook (7) facing the lock core (9) is convexly extended to form an abutment surface (71), and the abutment surface (71) abuts against the convex arm (92); the abutment surface (71) facing the rotation direction of the convex arm (92) is set as an inclined surface.

9. A locking mechanism according to claim 8, characterized in that: The bottom end of the lock hook (7) extends away from the abutment surface (71) to form a hook portion matched with the hook (11), and the bottom surface of the hook portion is arranged as an inclined surface.

10. A portable infusion pump, characterized in that: The invention comprises a locking mechanism as claimed in any one of claims 1 to 9, and further comprises a rotatably mounted liquid storage box and a driving pump, wherein a baffle (1) is mounted on the top surface of the liquid storage box, the baffle (1) extends upward to form a hook (11), a bracket (2) is mounted on the bottom surface of the driving pump, an axle frame (6) is mounted inside the driving pump above the bracket (2), and an upper end of a locking hook (7) is rotatably mounted on the axle frame (6) via a rotating shaft (3); one end of the driving pump and the facing surface of the liquid storage box are rotatably mounted via a rotating pin (10), and after the facing surfaces are fitted together, they are mounted into the locking hook (7) via a hook (11) at the other end to achieve locking.

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