Push injection assembly and injection device

Abstract

The invention discloses a pushing injection assembly and an injection device. The pushing injection assembly comprises a supporting component, a torsion piece, a pressing piece, an elastic reset piece, an elastic force storage mechanism, a bias device and a piston rod unit. The supporting component is provided with an injection output end; the torsion piece is provided with a first joint part; the elastic force storage mechanism is used for generating injection driving energy; a piston rod unit installed in the support member and provided with a second engaging portion; the bias device is provided with a bias joint part; the bias device can move between a first working position and a second working position; when the bias device is at the first working position, the bias joint part is separated from the second joint part and is jointed with the first joint part of the torsion part so as to act on the elastic force storage mechanism through the bias device to enable the elastic force storage mechanism to rotate when the torsion part rotates. The piston rod unit works stably and reliably, the energy transfer path of the piston rod unit can be shortened, and the energy transfer efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of injection devices, and in particular to a push injection component and an injection device. Background Art

[0002] Injection devices such as syringes and injection pens have the function of drug injection and are widely used in the medical industry. However, with the development of injection device technology, the functions of injection devices are also constantly improving, such as multiple small-dose injections, adjustment of single injection doses, injection sounding parts, and display scales.

[0003] The injection device with dosage adjustment function can meet more drug injection requirements and is favored by the industry. Among them, the push assembly, as an important part of the injection device, can generate push drive energy through the elastic storage mechanism to preset the corresponding injection volume. During injection, the push drive energy of the elastic storage mechanism is released and transmitted to the piston rod unit through the corresponding transmission path, so that the piston rod unit works to perform push injection.

[0004] However, since some existing push injection assemblies are prone to abnormal movement of the piston rod unit during dose setting, the working stability is poor. In addition, the energy transfer path of the piston rod unit is long, which affects the transfer efficiency, and thus it is far from meeting the high requirements of the industry. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, one of the objects of the present invention is to provide an injection assembly, which can avoid abnormal movement of the piston rod unit during dose setting, work stably and reliably, and also shorten the energy transfer path of the piston rod unit and improve the energy transfer efficiency.

[0006] A second object of the present invention is to provide an injection device which adopts the above-mentioned push injection assembly to avoid abnormal movement of the piston rod unit during dose setting, and to work stably and reliably. Moreover, the energy transfer path of the piston rod unit can be shortened to improve the energy transfer efficiency.

[0007] One of the purposes of the present invention is achieved by the following technical solution:

[0008] A push injection assembly includes a supporting member, a twisting member, a pressing member, an elastic reset member, an elastic force storage mechanism, a biasing device and a piston rod unit;

[0009] The support member is provided with an injection output end;

[0010] The torsion member is provided with a first engaging portion and an insertion slot;

[0011] The elastic force storage mechanism is used to generate injection driving energy;

[0012] The piston rod unit is installed in the support member and is provided with a second engaging portion;

[0013] The biaser is provided with a biasing engagement portion; the biaser can move between a first working position and a second working position; when the biaser is in the first working position, the biasing engagement portion is separated from the second engagement portion and engaged with the first engagement portion of the torsion member so as to rotate the elastic force storage mechanism through the biaser when the torsion member rotates; when the biaser is in the second working position, the biasing engagement portion is separated from the first engagement portion and engaged with the second engagement portion of the piston rod unit so as to transfer the injection driving energy of the elastic force storage mechanism to the piston rod unit;

[0014] The pressing member is provided with a push arm, which is movably inserted in the insertion slot; the pressing member is used to apply a thrust to the biasing device when moving in a direction close to the injection output end so as to move the biasing device to the second working position;

[0015] The elastic reset member is used to provide an elastic force to cause the biasing device to reset to the first working position.

[0016] The elastic force storage mechanism comprises a torsion elastic element and a rotating member, wherein the rotating member is rotatably installed in the supporting member, one end of the torsion elastic element is connected to the rotating member, and the other end is connected to the supporting member.

[0017] The elastic force storage mechanism is used to generate injection driving energy when rotating in the forward direction. The elastic force storage mechanism also includes a sound-generating member, which rotates synchronously with the rotating member and can move relative to the rotating member. The injection assembly also includes a positioning member. The positioning member is movably installed in the support member, and a third engaging portion for engaging with the support member is provided on the positioning member. When the third engaging portion of the positioning member engages with the support member, the positioning member is anti-rotationally engaged with the support member and is used to position the sound-generating member. When the biaser is located in the first working position, the third engaging portion of the positioning member engages with the support member. When the biaser is located in the second working position, the third engaging portion of the positioning member is separated from the support member. The pressing member is used to apply a thrust to the positioning member and the sound-generating member when moving in a direction close to the injection output end so that the positioning member and the sound-generating member move in a direction close to the injection output end so that the third engaging portion is separated from the support member. The elastic reset member is used to apply an elastic force directed to the positioning member to the sound-generating member, and the elastic reset member is also used to provide an elastic force that causes the positioning member to reset to the third engaging portion to engage with the support member.

[0018] The positioning member is provided with a plurality of one-way teeth arranged circumferentially, and the sound-generating member is provided with a plurality of bevel teeth for meshing with the one-way teeth of the positioning member.

[0019] The elastic reset member abuts between the rotating member and the sound-generating member; the biasing device is provided with a flange portion for abutting between the positioning member and the sound-generating member; and the push arm of the pressing member faces the positioning member.

[0020] The sound-generating member is movably mounted outside the biasing device, and a sound-generating member action surface is provided on the sound-generating member. The biasing device is provided with a biasing action surface for pushing the sound-generating member action surface when the biasing device rotates forward to enable the sound-generating member to rotate forward; when the biasing device is located at the second working position, the sound-generating member action surface is used to push the biasing action surface when reverse rotation occurs to enable the biasing device to rotate reversely.

[0021] The sounding piece is provided with a sounding piece guiding inclined surface; the biasing device is provided with a biasing guiding inclined surface for slidingly cooperating with the sounding piece guiding inclined surface and for pushing the sounding piece guiding inclined surface when the biasing device is located at the first working position and rotates in the reverse direction to make the sounding piece shift and separate from the positioning member.

[0022] The biasing device is provided with a first biasing protrusion and a second biasing protrusion, the biasing action surface is provided on one side of the first biasing protrusion, the other side of the first biasing protrusion is formed as a biasing stop position, the biasing guide slope is formed on the second biasing protrusion, the sounding member is provided with a first sounding member groove for the first biasing protrusion to be movably embedded and a second sounding member groove for the second biasing protrusion to be embedded, the groove side wall of the first sounding member groove opposite to the biasing action surface is formed as a sounding member action surface, the The groove side wall of the first sounding member groove opposite to the offset stop position is formed as the sounding member stop position, and the groove side wall of the second sounding member groove opposite to the offset guide inclined surface is formed as the sounding member guide inclined surface; when the sounding member action surface and the offset action surface are in contact with each other, there is a gap between the offset stop position and the sounding member stop position; when the offset device is located in the first working position and rotates in the opposite direction to use the offset guide inclined surface to push the sounding member guide inclined surface, when the offset stop position is in contact with the sounding member stop position, the sounding member is separated from the positioning member.

[0023] When the biasing engagement portion is engaged with the first engagement portion, the torsion member and the biaser are synchronously rotated and matched; when the biasing engagement portion is engaged with the second engagement portion, the biaser and the piston rod unit are synchronously rotated and matched.

[0024] The piston rod unit includes a linkage, a piston rod and a piston, wherein the linkage is rotatably mounted in a supporting member, and the second engaging portion is arranged on the linkage; the piston rod is threadedly connected to the supporting member, the piston rod rotates synchronously with the linkage and can move relative to the linkage; the piston is arranged on the piston rod.

[0025] The twisting member is rotatably mounted on the supporting member, and the elastic force storage mechanism is located inside the supporting member; the pressing member is movably mounted on the twisting member.

[0026] The second object of the present invention is achieved by the following technical solution:

[0027] The injection device comprises a dose accumulation component and the above-mentioned push injection component, wherein the dose accumulation component is arranged between the torsion member and the support member; a medicine storage unit is arranged on the support member, and the piston rod unit is used to push the medicine liquid in the medicine storage unit toward the injection output end.

[0028] Compared with the prior art, the beneficial effects of the present invention are: it can avoid the abnormal movement of the piston rod unit during the dose setting period, the operation is stable and reliable, and the energy transfer path of the piston rod unit can be shortened to improve the energy transfer efficiency; in addition, by reasonably setting the installation relationship between the torsion member and the pressing member, it can be convenient for installation and make the structure more compact; the operation is simple and convenient, which is conducive to promotion; BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of the push injection assembly of the present invention;

[0030] Figure 2 for Figure 1 The upper part of the enlarged image;

[0031] Figure 3 is a cross-sectional view of the push injection assembly of the present invention from another direction;

[0032] Figure 4 An exploded view of the push injection assembly of the present invention;

[0033] Figure 5 It is an exploded diagram of the elastic force storage mechanism;

[0034] Figure 6 It is a schematic diagram of the meshing cooperation between the positioning member and the sound-generating member;

[0035] Figure 7 is an enlarged view of the engagement between the positioning member and the sound generating member;

[0036] Figure 8 It is a schematic diagram of the separation state of the positioning member and the sound-generating member;

[0037] Fig. 9 It is an enlarged view of the separation state of the positioning member and the sound-generating member;

[0038] Fig.10 It is a schematic diagram of the coordination between the scale ring and the supporting member;

[0039] Fig.11 is a schematic diagram of a torsion member;

[0040] Fig.12 is a schematic diagram of the torsion member in another direction;

[0041] Fig.13 is a schematic diagram of a positioning member;

[0042] Fig.14 is a schematic diagram of a bias device;

[0043] Fig.15 is a schematic diagram of a sound-generating component;

[0044] Fig.16 is a cross-sectional view of a bias device;

[0045] Fig.17 is a cross-sectional view of a pressing member;

[0046] Fig.18 Schematic diagram of the linkage. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" 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 a limitation on the present invention. In addition, features defined as "first" and "second" 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.

[0049] 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 according to specific circumstances.

[0050] like Figure 1-4As shown, a push injection assembly includes a support member 40, a twisting member 13, a pressing member 11, an elastic reset member 34, an elastic force storage mechanism 30, a biasing device 32 and a piston rod unit 20;

[0051] The support member 40 is provided with an injection output end 410;

[0052] The torsion member 13 is provided with a first engaging portion 134;

[0053] The elastic force storage mechanism 30 is used to generate injection driving energy;

[0054] The piston rod unit 20 is installed in the support member 40 and is provided with a second engaging portion 211;

[0055] The biasing device 32 is provided with a biasing engagement portion 324; the biasing device 32 can move between a first working position and a second working position; when the biasing device 32 is in the first working position, the biasing engagement portion 324 is separated from the second coupling portion and is engaged with the first engagement portion 134 of the torsion member 13 so as to act on the elastic force storage mechanism 30 through the biasing device 32 when the torsion member 13 rotates to make the elastic force storage mechanism 30 rotate; when the biasing device 32 is in the second working position, the biasing engagement portion 324 is separated from the first engagement portion 134 and is engaged with the second engagement portion 211 of the piston rod unit 20 so as to transfer the injection driving energy of the elastic force storage mechanism 30 to the piston rod unit 20;

[0056] The pressing member 11 is used to apply a thrust to the biasing device 32 to move the biasing device 32 to the second working position when moving in a direction close to the injection output end 410;

[0057] The elastic return member 34 is used to provide an elastic force to cause the biasing device 32 to return to the first working position.

[0058] During dose setting, the biaser 32 is located in the first working position, and the torsion member 13 is rotated in the forward direction. At this time, the biaser 32 acts on the elastic force storage mechanism 30 to cause the elastic force storage mechanism 30 to rotate in the forward direction to generate push drive energy. During push injection, the pressing member 11 is moved in a direction close to the injection output end 410. At this time, the pressing member 11 applies a thrust to the biaser 32 to move the biaser 32 to the second working position. The push drive energy released by the elastic force storage mechanism 30 can be transmitted to the piston rod unit 20 through the biaser 32 to make the piston rod unit 20 work. When the push injection is completed, the elastic force of the elastic reset member 34 causes the biasing device 32 to reset to the first working position. Therefore, during the dose setting period, the biasing device 32 is located in the first working position, and the biasing engagement portion 324 engages with the first engagement portion 134 of the torsion member 13 and separates from the second engagement portion, so that only the biasing device 32 acts on the elastic force storage mechanism 30, and the transmission between the biasing device 32 and the piston rod unit 20 is cut off, which can prevent the biasing device 32 from acting on the piston rod unit 20, thereby preventing abnormal movement of the piston rod unit 20 during dose setting, and the operation is stable and reliable. Moreover, during the push injection period, the push injection driving energy of the elastic force storage mechanism 30 is transmitted to the piston rod unit 20 via the biasing device 32, which can shorten the push injection driving energy transmission path of the piston rod unit 20 and improve efficiency.

[0059] Among them, when the biaser 32 is in the first working position, the biasing engagement portion 324 is separated from the second engagement portion and engaged with the first engagement portion 134 of the torsion member 13 so as to be used for acting on the elastic force storage mechanism 30 through the biaser 32 to rotate the elastic force storage mechanism 30 when the torsion member 13 rotates. The phrase "acting on the elastic force storage mechanism 30 through the biaser 32 to rotate the elastic force storage mechanism 30 when the torsion member 13 rotates" can be used to act on the elastic force storage mechanism 30 through the biaser 32 when the torsion member 13 rotates so that the elastic force storage mechanism 30 rotates driven by the biaser 32, or to act on the elastic force storage mechanism 30 through the biaser 32 when the torsion member 13 rotates so that the elastic force storage mechanism 30 is linked to rotate under the action of its own elastic torque.

[0060] The elastic force storage mechanism 30 includes a torsion elastic element 36 and a rotating member 35, wherein the rotating member 35 is rotatably mounted in the support member 40, wherein one end of the torsion elastic element 36 is connected to the rotating member 35, and the other end is connected to the support member 40. When the biaser 32 is located at the first working position, the torsion member 13 is rotated in the forward direction, and at this time, the biaser 32 acts on the elastic force storage mechanism 30 to make the rotating member 35 of the elastic force storage mechanism 30 rotate in the forward direction. During the forward rotation of the rotating member 35, the torsion elastic element 36 is twisted in the forward direction to generate elastic torsion, thereby generating push drive energy. When the biaser 32 is located at the second working position, the push drive energy can be released by elastic recovery of the torsion elastic element 36. Among them, by rotating the rotating member 35 to different rotation amplitudes, the torsional elastic element 36 can be twisted to different tightening states to generate different elastic torques, and different push drive energies can be generated, so that different push amounts (i.e., doses) can be set, so that in the subsequent push process, the corresponding push drive energy can be transmitted to the piston rod unit 20, so that the piston rod unit 20 can be driven by the corresponding push drive energy to push according to the preset dose.

[0061] In this embodiment, the torsion elastic element 36 can be an elastic element such as a torsion spring. The positive rotation is clockwise rotation, and the reverse rotation is counterclockwise rotation.

[0062] In this embodiment, the elastic force storage mechanism 30 is located inside the supporting member 40 .

[0063] The elastic force storage mechanism 30 is used to generate injection driving energy when rotating in the forward direction. The elastic force storage mechanism 30 also includes a sounding member 33, which rotates synchronously with the rotating member 35 and can move relative to the rotating member 35; the injection assembly also includes a positioning member 15; the positioning member 15 is movably installed in the support member 40, and the positioning member 15 is provided with a third engaging portion 152 for engaging with the support member 40; when the third engaging portion 152 of the positioning member 15 is engaged with the support member 40, the positioning member 15 is anti-rotationally engaged with the support member 40 and is used to position the sounding member 33; when the biasing device 32 is in the first working position, the positioning member 15 5 is engaged with the supporting member 40; when the biaser 32 is located at the second working position, the third engaging portion 152 of the positioning member 15 is separated from the supporting member 40; the pressing member 11 is used to apply a thrust to the positioning member 15 and the sounding member 33 when moving in a direction close to the injection output end 410, so that the positioning member 15 and the sounding member 33 move in a direction close to the injection output end 410 to separate the third engaging portion 152 from the supporting member 40; the elastic reset member 34 is used to apply an elastic force directed to the positioning member 15 to the sounding member, and the elastic reset member 34 is also used to provide an elastic force that causes the positioning member 15 to be reset to the third engaging portion 152 to engage with the supporting member 40.During dose setting, the biaser 32 is located in the first working position, and the torsion member 13 is rotated forwardly. At this time, the biaser 32 acts on the elastic force storage mechanism 30 to make the rotating member 35 and the sounding member of the elastic force storage mechanism 30 rotate forwardly, and the torsion elastic element 36 is twisted forwardly to generate injection driving energy, and then the sounding member is positioned by the positioning member 15 to keep the elastic force storage mechanism 30 at the corresponding rotation amplitude, and the torsion elastic element 36 is kept in the corresponding twisting state to prevent the torsion elastic element 36 from rotating in the opposite direction and elastically recovering, thereby storing the corresponding injection driving energy to set the corresponding dose. During the push injection, when the pressing member 11 is pressed to move the pressing member 11 in a direction close to the injection output end 410, a thrust is applied to the biaser 32 to move the biaser 32 to the second working position, and a thrust is applied to the positioning member 15 and the sounding member to move the positioning member 15 and the sounding member in a direction close to the injection output end 410 to The third engaging portion 152 is separated from the supporting member 40. Due to the separation of the third engaging portion 152 from the supporting member 40, the anti-rotational cooperation between the positioning member 15 and the supporting member 40 is released. At this time, the positioning member 15 can rotate relative to the supporting member 40, thereby releasing the positioning effect on the elastic force storage mechanism 30. The positioning member 15, the sounding member and the rotating member 35 rotate in the opposite direction under the elastic torsional force of the torsional elastic element 36, and are transmitted to the piston rod unit 20 through the biasing device 32, thereby realizing the transmission of the push drive energy of the elastic force storage mechanism 30 to the piston rod unit 20, and the pressing force of the pressing member 11 is removed. The elastic reset member 34 applies an elastic force directed to the positioning member 15 to the sounding member to reset the meshing state of the sounding member and the positioning member 15, and the elastic force of the elastic reset member 34 causes the biasing device 32 to reset to the first working position, and causes the positioning member 15 to reset to the elastic force of the third engaging portion 152 and the supporting member 40.

[0064] The synchronous rotation cooperation means that when one of the objects in the synchronous rotation cooperation rotates, the other objects in the synchronous rotation cooperation also rotate.

[0065] The positioning member 15 is provided with a plurality of one-way teeth 151 arranged circumferentially, and the sounding member is provided with a plurality of bevel teeth 331 for meshing with the one-way teeth 151 of the positioning member 15. When the biaser 32 is located at the first working position, the third engaging portion 152 of the positioning member 15 is engaged with the supporting member 40, and the torsion member 13 is rotated forwardly. At this time, the sounding member is driven by the biaser 32 to rotate forwardly relative to the positioning member 15. During the forward rotation of the sounding member, the bevel teeth 331 slide along the tooth bevel of the one-way teeth 151. Each time the bevel teeth 331 pass over a one-way tooth 151, the bevel teeth 331 move relative to the one-way teeth 151 of the positioning member 15 in a direction close to the injection output end 410, and the two move in a direction close to each other. A brief separation is formed, after which the sounding member is pushed toward the positioning member 15 by the elastic reset member 34, and the bevel tooth 331 meshes with the next one-way tooth 151, that is, the sounding member rotates one tooth in the positive direction relative to the positioning member 15, and the two continue to mesh after the rotation, and the sound is generated by the sliding and collision between the bevel tooth 331 and the one-way tooth 151, which can play the role of the sounding member in the positive direction of the dose setting, and the positive rotation of the sounding member can drive the rotating member 35 to rotate in the positive direction, so as to drive the torsional elastic element 36 to twist and generate injection driving energy. After the torsion piece 13 rotates into place during the dose setting period, the torsion elastic element 36 drives the sounding piece to have a tendency to rotate in the opposite direction. At this time, the bevel teeth 331 of the sounding piece are engaged with the one-way teeth 151, and the tendency of the sounding piece to rotate in the opposite direction is blocked. Therefore, the sounding piece can be positioned by engaging the one-way teeth 151 of the positioning piece 15 with the multiple bevel teeth 331 of the sounding piece, so that the sounding piece and the rotating piece 35 are kept at the corresponding rotation amplitude, and the torsion elastic element 36 is kept in the corresponding twisting state to prevent the torsion elastic element 36 from rotating in the opposite direction.

[0066] The one-way teeth 151 of the positioning member 15 may adopt an existing one-way transmission structure, for example, a bevel tooth surface and a straight stop surface are provided.

[0067] Of course, in addition to this, the positioning member 15 can also adopt other structures as long as the positioning of the sounding member can be achieved. For example, the positioning member 15 can adopt a positioning seat provided with a plurality of positioning holes, and the sounding member is provided with a ball and a spring that cooperate with the positioning holes. However, the positioning member 15 is provided with a plurality of one-way teeth 151 arranged circumferentially, and the sounding member is provided with a plurality of bevel teeth 331 for engaging with the one-way teeth 151 of the positioning member 15. This is the most preferred embodiment of the present invention. On the one hand, when the third engaging portion 152 of the positioning member 15 is engaged with the supporting member 40, and the to-be-dose setting period is twisted When the member 13 is rotated into place, the engagement of the one-way tooth 151 with the bevel tooth 331 can ensure stable positioning. On the other hand, during dose setting, the biaser 32 is located in the first working position. When the torsion member 13 is rotated in the forward direction, the biaser 32 acts on the sound-generating member of the elastic force storage mechanism 30, and the bevel tooth 331 can slide along the tooth bevel of the one-way tooth 151 to reach other one-way teeth 151 to achieve one-way transmission. The bevel tooth 331 slides and collides with the one-way tooth 151 to produce a sound, which can play the role of a sound-generating member for forward dose setting, and has the advantages of simple structure and convenience for forward adjustment.

[0068] In this embodiment, the positioning member 15 is a ratchet. Of course, other components can also be used as long as a plurality of one-way teeth 151 are arranged on the circumference thereof.

[0069] The support member 40 is provided with a support engagement portion for a third engagement portion 152. The third engagement portion 152 is a plurality of ratchet teeth circumferentially arranged on the positioning member 15. The support engagement portion includes a plurality of support slots 411 circumferentially arranged on the inner wall of the support member 40 and for the plurality of ratchet teeth to be respectively inserted therein. The plurality of ratchet teeth are respectively inserted one by one into the plurality of support slots 411 correspondingly, so that the third engagement portion 152 can be engaged with the support member 40, thereby limiting the rotation of the positioning member 15 relative to the support member 40, and realizing the anti-rotational cooperation between the positioning member 15 and the support member 40. When the positioning member 15 moves to the point where the ratchet teeth are separated from the support slots 411, the positioning member 15 can rotate relative to the support member 40.

[0070] Of course, in addition to this, the third engaging portion 152 may also adopt other structures, as long as the anti-rotational cooperation between the positioning member 15 and the support member 40 can be achieved. For example, the third engaging portion 152 is a plurality of ratchet slots circumferentially arranged on the positioning member 15, and a plurality of supporting teeth are circumferentially arranged on the inner wall of the support member 40 and are respectively inserted into the plurality of ratchet slots in a one-to-one correspondence. The third engaging portion 152 can be engaged with the support member 40 by the plurality of supporting teeth being respectively inserted into the plurality of ratchet slots in a one-to-one correspondence, thereby limiting the rotation of the positioning member 15 relative to the support member 40, achieving anti-rotational cooperation between the positioning member 15 and the support member 40, and when the positioning member 15 moves to the point where the ratchet slot is separated from the supporting teeth, the positioning member 15 can rotate relative to the support member 40.

[0071] A limiting wall 412 is provided on one side of the supporting joint away from the injection output end 410 for blocking and limiting the third joint 152. The positioning member 15 includes a positioning collar 153, the one-way teeth 151 are arranged at the bottom of the positioning collar 153, an outer convex ring 154 extending outward is arranged on the positioning collar 153, and the ratchet teeth are circumferentially arranged on the outer convex ring 154.

[0072] In this embodiment, one end of the sounding member close to the injection output end 410 is located in the rotating member 35. Specifically, the rotating member 35 is provided with a rotating slot extending along its axial direction, and the sounding member is provided with a sounding member protrusion 339 embedded in the rotating slot and movable along the extending direction of the rotating slot, so that the sounding member and the rotating member 35 can rotate synchronously and move relative to the rotating member 35 through the embedding cooperation of the sounding member protrusion 339 and the rotating slot.

[0073] Of course, in addition to this, the sound-emitting member is provided with a sound-emitting member slot, and the rotating member 35 may also be provided with a rotating protrusion extending along its axial direction. The rotating protrusion is embedded in the sound-emitting member slot and can move along the extension direction of the sound-emitting member slot, which can also make the sound-emitting member and the rotating member 35 rotate synchronously and move relative to the rotating member 35.

[0074] The elastic reset member 34 abuts between the rotating member 35 and the sounding member; the deflector 32 is provided with a flange portion 325 for abutting between the positioning member 15 and the sounding member; the pressing member 11 is provided with a push arm 111 facing the positioning member 15, and when the pressing member 11 is pressed to move the pressing member 11 in a direction close to the injection output end 410, the thrust applied to the positioning member 15 by the push arm 111 can be transmitted to the deflector 32 and the sounding member, thereby prompting the positioning member 15, the deflector 32 and the sounding member to move together in a direction close to the injection output end 410 under the thrust of the positioning member 15, so that the deflector 32 moves When the pressing member 11 is moved to the second working position, the positioning member 15 moves to the third engaging portion 152 and separates from the supporting member 40. At this time, the elastic reset member 34 is compressed as the sounding member moves toward the injection output end 410. When the pressing force on the pressing member 11 is removed, the elastic reset member 34 elastically stretches, and the positioning member 15, the biasing device 32 and the sounding member move together in a direction away from the injection output end 410 under the elastic force of the elastic reset member 34, so that the sounding member and the positioning member 15 are reset in the meshing state, the biasing device 32 is reset to the first working position, and the positioning member 15 is reset to the third engaging portion 152 and engaged with the supporting member 40.

[0075] In this embodiment, the elastic return member 34 can be a spring, an elastic sheet, etc.

[0076] In this embodiment, the push assembly also includes a gasket 14, which is used to abut between the positioning member 15 and the push arm 111, so that when the pressing member 11 is pressed to move in a direction close to the injection output end 410, the thrust of the push arm 111 can be indirectly applied to the positioning member 15, the biasing device 32 and the sounding member through the gasket 14.

[0077] In this embodiment, the torsion member 13 is rotatably mounted on the support member 40, and the pressing member 11 is movably mounted on the torsion member 13. Specifically, the torsion member 13 is provided with an insertion slot 135, and the push arm 111 is movably inserted into the insertion slot 135, so that the push member 11 can move relative to the torsion member 13, and the installation is convenient, making the structure more compact. In this embodiment, the extension track of the insertion slot 135 is in an arc shape, and the extension track of the push arm 111 matches.

[0078] Of course, the pressing member 11 can also be installed on the supporting member 40, as long as the pressing member 11 can exert thrust on the positioning member 15, the biasing device 32 and the sounding member to realize their functions when the pressing member 11 moves in the direction close to the injection output end 410. However, the pressing member 11 is movably installed on the torsion member 13, which is the most preferred embodiment of the present invention, and can make the structure compact and reduce the volume.

[0079] The sounding member is movably mounted outside the biasing device 32, and a sounding member action surface 334 is provided on the sounding member. The biasing device 32 is provided with a biasing action surface 323 for pushing the sounding member action surface 334 to make the sounding member rotate forwardly when the biasing device 32 rotates forwardly; when the biasing device 32 is located at the second working position, the sounding member action surface 334 is used to push the biasing action surface 323 when it rotates reversely to make the biasing device 32 rotate reversely. During the forward setting of the dose, the biasing device 32 is located at the first working position, and when the torsion member 13 rotates forwardly, the torsion member 13 drives the biasing device 32 to rotate forwardly, and during the forward rotation of the biasing device 32, the biasing action surface 323 of the biasing device 32 pushes the sounding member action surface 334, so that the sounding member and the rotating member 35 rotate forwardly, so that the torsion elastic element 36 rotates and twists with the forward rotation of the rotating member 35 to generate elastic torque, thereby generating injection driving energy. During the push injection, the pressing member 11 is pressed to move the pressing member 11 in the direction close to the injection output end 410, and the thrust applied by the pressing member 11 causes the positioning member 15, the biasing device 32 and the sounding member to move together in the direction close to the injection output end 410, so that the biasing device 32 moves to the second working position, and the positioning member 15 moves to the third engaging portion 152 and separates from the support member 40. At this time, the elastic reset member 34 is compressed, and since the third engaging portion 152 is separated from the support member 40, the anti-rotational cooperation between the positioning member 15 and the support member 40 is released. At this time, the positioning member 15 can rotate relative to the support member 40, so that the positioning member 15, the sounding member and the rotating member 35 are in the elastic torsion of the torsional elastic element 36. , and then the sounding member action surface 334 of the sounding member pushes the biasing action surface 323, causing the biasing device 32 to rotate in the opposite direction, and the reverse rotation is transmitted to the piston rod unit 20 through the biasing device 32, so that the push drive energy of the elastic storage mechanism 30 is transmitted to the piston rod unit 20 in a transmission manner through the biasing device 32, and the pressing force of the pressing member 11 is removed, and the positioning member 15, the biasing device 32 and the sounding member move together in a direction away from the injection output end 410 under the elastic force of the elastic reset member 34, prompting the sounding member to reset the meshing state with the positioning member 15, the biasing device 32 to reset to the first working position, and the positioning member 15 to reset to the third joint portion 152 to engage with the support member 40.

[0080] The sound-emitting member is provided with a sound-emitting member guiding inclined surface 335; the biasing device 32 is provided with a biasing guiding inclined surface 326 for slidingly cooperating with the sound-emitting member guiding inclined surface 335 and for pushing the sound-emitting member guiding inclined surface 335 when the biasing device 32 is located at the first working position and rotates in the reverse direction to shift the sound-emitting member and separate it from the positioning member 15. During dose setting, the biaser 32 is located at the first working position. When the torsion piece 13 is rotated in the reverse direction, the torsion piece 13 drives the biaser 32 to rotate in the reverse direction. During the reverse rotation of the biaser 32, since the reverse rotation of the sounding piece is blocked by the positioning piece 15, the biasing guide slope 326 of the biaser 32 pushes the sounding piece guide slope 335, causing the sounding piece to shift and separate from the positioning piece 15. At this time, the positioning effect of the positioning piece 15 on the sounding piece is lost, and the sounding piece and the rotating piece 35 rotate in the reverse direction under the elastic torsion of the torsional elastic element 36. Then, under the elastic force of the elastic reset piece 34, the sounding piece is reset to engage with the positioning piece 15. In this way, the dose reverse adjustment can be achieved to correct the dose. When the sounding piece moves to engage with the positioning piece 15, the inclined tooth 331 of the sounding piece hits the one-way tooth 151 of the positioning piece 15 to produce a sound, thereby playing a role in the reverse dose adjustment sound. By providing a sound-emitting member guide slope 335 on the sound-emitting member and providing a biasing guide slope 326 on the biasing device 32 that slidably cooperates with the sound-emitting member guide slope 335, when the forward rotation of the torsion member 13 is too large to generate excessive injection driving energy, it can be adjusted in the reverse direction to reduce the injection driving energy. That is, when the set amount is too large during forward setting of the dose, the dose can be adjusted in the reverse direction to reduce the set dose, thereby achieving the effect of correcting the injection dose.

[0081] In this embodiment, the offset guide slope 326 and the sounding member guide slope 335 are inclined in the reverse direction away from the injection output end 410. The offset guide slope 326 and the sounding member guide slope 335 have the same inclination. The sounding member action surface 334 and the offset action surface 323 are arranged in vertical planes.

[0082] Of course, the offset guide slope 326, the sounding member guide slope 335, the sounding member action surface 334, and the offset action surface 323 are not limited thereto, and their shapes and sizes can be set according to actual needs as long as they can meet their functional requirements.

[0083] Further optimized, the biasing device 32 is provided with a first biasing protrusion 327 and a second biasing protrusion 328, the biasing action surface 323 is provided on one side of the first biasing protrusion 327, the other side of the first biasing protrusion 327 is formed as a biasing stop position 322, the biasing guide inclined surface 326 is formed on the second biasing protrusion 328, the sounding member is provided with a first sounding member groove 336 for the first biasing protrusion 327 to be movably embedded and a second sounding member groove 337 for the second biasing protrusion 328 to be embedded, the groove side wall of the first sounding member groove 336 opposite to the biasing action surface 323 is formed as the sounding member action surface 33 4, the groove side wall of the first sounding member groove 336 opposite to the offset stop position 322 forms a sounding member stop position 333, and the groove side wall of the second sounding member groove 337 opposite to the offset guide inclined surface 326 forms a sounding member guide inclined surface 335; when the sounding member action surface 334 and the offset action surface 323 are aligned, there is a gap between the offset stop position 322 and the sounding member stop position 333; when the biasing device 32 is located at the first working position and rotates in the opposite direction and uses the offset guide inclined surface 326 to push the sounding member guide inclined surface 335, when the offset stop position 322 and the sounding member stop position 333 are aligned, the sounding member is separated from the positioning member 15. During the dose setting, the biasing device 32 is located at the first working position. When the torsion member 13 is rotated in the reverse direction, the torsion member 13 drives the biasing device 32 to rotate in the reverse direction. During the reverse rotation of the biasing device 32, the biasing guide inclined surface 326 of the biasing device 32 pushes the guiding inclined surface 335 of the sounding member. The sounding member has a tendency to rotate in the reverse direction and move toward the injection output end 410. However, the inclined surface teeth 331 of the sounding member are meshed with the one-way teeth 151 at this time, and the reverse rotation is blocked by the positioning member 15. The sounding member can only move toward the injection output end 410. At this time, the sounding member produces a displacement in the direction close to the injection output end 410 to squeeze the elastic reset member 34. When the biasing device 32 rotates in the reverse direction to the biasing stop position When 322 is in contact with the stop position 333 of the sound-emitting member, the sound-emitting member moves until the inclined tooth 331 is completely disengaged from the one-way tooth 151. At this time, the sound-emitting member is disengaged from the positioning member 15. Since the sound-emitting member loses the positioning effect of the positioning member 15, it begins to rotate in the opposite direction under the elastic torsional force of the torsional elastic element 36. The biasing guide inclined surface 326 of the biasing device 32 is disengaged from the sound-emitting member guide inclined surface 335 of the sound-emitting member. There is an axial gap between the biasing device 32 and the sound-emitting member. The elastic reset member 34 pushes the sound-emitting member to move toward the positioning member 15, and the sound-emitting member and the positioning member 15 return to the meshing state. In this embodiment, the sound-emitting member rotates in the opposite direction relative to the positioning member 15 by a distance of the one-way tooth 151 each time, and the two continue to mesh after the rotation.Each time the sounding member rotates one tooth, it separates from the positioning member 15 once, and then the two resume meshing, thereby achieving reverse setting of the dose in the above manner, generating injection driving energy when the twisting member 13 rotates forward, and releasing the injection driving energy when the twisting member 13 rotates reversely, so as to reduce the set dose and achieve the effect of correcting the injection dose.

[0084] Among them, at least two first offset protrusions 327 and at least two second offset protrusions 328 are arranged alternately and at intervals on the outer wall of the offset device 32 along its circumferential direction, and at least two first sounding member grooves 336 corresponding to the at least two first offset protrusions 327 and at least two second sounding member grooves 337 corresponding to the at least two second offset protrusions 328 are arranged on the inner side of the main cylinder of the sounding member.

[0085] In this embodiment, the first biasing protrusion 327 is rectangular, and two of the first biasing protrusion 327 and two of the second biasing protrusion 328 are provided.

[0086] The shapes and quantities of the first offset protrusion 327 and the second offset protrusion 328 can be set according to actual needs, and the first sounding member groove 336 and the second sounding member groove 337 are set correspondingly.

[0087] Specifically, the biasing device 32 includes a biasing main cylinder, and the first biasing protrusion 327 and the second biasing protrusion 328 are formed on the outer wall of the biasing main cylinder. The flange portion 325 is arranged on the side of the first biasing protrusion 327 and the second biasing protrusion 328 away from the injection output end 410. The sounding member includes a sounding member main cylinder, the first sounding member groove 336 and the second sounding member groove 337 are correspondingly arranged on the inner side of the sounding member main cylinder, and the bevel teeth 331 are arranged at one end of the sounding member main cylinder away from the injection output end 410, so as to facilitate processing. The rotating member 35 is provided with a stroke groove extending along its axial direction, and the sounding member is provided with an anti-disconnection hook that movably cooperates with the stroke groove, so that when the sounding member moves relative to the rotating member 35, the anti-disconnection hook moves along the stroke groove, and the groove wall at one end of the stroke groove away from the injection output end 410 can play a limiting role, which can prevent the anti-disconnection hook from being separated, thereby preventing the sounding member from being separated from the rotating member 35.

[0088] Specifically, when the biasing engagement portion 324 engages with the first engagement portion 134 , the torsion member 13 and the biasing device 32 rotate synchronously with each other, and when the biasing engagement portion 324 engages with the second engagement portion 211 , the biasing device 32 and the piston rod unit 20 rotate synchronously with each other.

[0089] In this embodiment, the offset engagement portion 324 includes a first offset tooth and a second offset tooth, the first engagement portion 134 includes a plurality of first engagement slots for respectively correspondingly inserting a plurality of first offset teeth, and the second engagement portion 211 includes a plurality of second engagement slots for respectively correspondingly inserting a plurality of second offset teeth; in this way, when the first offset tooth is inserted and matched with the plurality of first engagement slots of the first engagement portion 134, the offset device 32 is rotationally matched with the torsion member 13, and when the second offset tooth is inserted and matched with the plurality of second engagement slots of the second engagement portion 211, the offset device 32 is synchronously rotationally matched with the piston rod unit 20.

[0090] Of course, in addition to this, the offset joint part 324, the first joint part 134, and the second joint part 211 may also adopt other structures. For example, the offset joint part 324 is a plurality of offset slots arranged in a circumference, and the first joint part 134 and the second joint part 211 both include a plurality of engaging teeth for respectively and correspondingly inserting into the plurality of offset slots, which can also realize the synchronous rotation cooperation of the offset device 32 with the torsion member 13 and the piston rod unit 20.

[0091] The piston rod unit 20 includes a linkage 21, a piston rod 22 and a piston 24. The linkage 21 is rotatably mounted in the support member 40, and the second joint 211 is arranged on the linkage 21; the piston rod 22 is threadedly connected to the support member 40, and the piston rod 22 rotates synchronously with the linkage 21 and can move relative to the linkage 21; the piston 24 is arranged on the piston rod 22, and when the biaser 32 drives the linkage 21 to rotate, the piston rod 22 rotates under the drive of the linkage 21 and spirally advances under the action of the thread of the support member 40, so that the piston can be used for push injection. The inner circumference of the support member 40 is provided with a plurality of one-way sounding teeth, and the linkage 21 is provided with an elastic arm 212, and the elastic arm 212 is provided with a matching sounding tooth 213 meshed with the one-way sounding tooth, so that when the linkage 21 rotates, the matching sounding tooth 213 slides and collides with the one-way sounding tooth in sequence to produce sound, which can play a push injection sounding role.

[0092] The push injection assembly further includes a scale ring 37, which is movably mounted on the rotating member 35 and is threadedly connected to the support member 40. A window is provided on the support member 40 corresponding to the scale ring 37. When the rotating member 35 rotates, the scale ring 37 is guided by the thread of the support member 40 to spirally move under the driving action of the rotating member 35, and the set scale value on the scale ring 37 can be observed through the window of the support member 40 (not shown). Among them, the support member 40 is provided with an initial gear position and a terminal gear position 415, which are sequentially arranged in a direction away from the injection output end 410. In the initial state, the scale ring 37 is in contact with the initial gear position, so that the scale ring 37, the rotating member 35, and the sounding member 33 cannot rotate in the opposite direction. When setting the dose, the scale ring 37 moves to the terminal gear position 415 to be in contact, and the dose value cannot be increased at this time, thereby improving the safety of use.

[0093] The torsion member 13 includes a pressing cap 136 and a center column 137 arranged on the pressing cap 136, and the pressing cap 136 is rotatably mounted on the supporting member 40. The first engaging portion 134 is arranged on the center column 137, and the center column 137 is located on the side of the linkage member 21 away from the injection output end 410. The biasing device 32 can slide axially onto the center column 137 and the linkage member 21 to be movable to the first working position and the second working position.

[0094] In this embodiment, the piston rod unit 20 is disposed inside the rotating member 35 , and the center column 137 is disposed inside the positioning member 15 .

[0095] The supporting member 40 may include an outer shell, a torsion spring seat 38 arranged in the outer shell, a fixed seat 31 arranged in the outer shell, and a guide seat 23 arranged in the outer shell; the supporting joint may be formed on the fixed seat 31, the torsion spring is connected to the torsion spring seat 38, and the one-way sounding tooth is arranged on the torsion spring seat 38; the piston rod is threadedly connected to the guide seat 23.

[0096] Of course, in addition to this, the support member 40 can also be configured according to actual needs, but the support member 40 using a combination of a housing, a torsion spring seat 38 and a fixing seat 31 is the most preferred embodiment of the present invention and is convenient for processing.

[0097] The actual dose setting process of the push injection assembly of the present invention is as follows: the twisting member 13 is rotated, and the twisting member 13 is engaged with the biasing engagement portion 324 of the biasing device 32 through the first engagement portion 134, so as to drive the biasing device 32, the sounding member 33, the rotating member 35, and the scale ring 37 to rotate through the twisting member 13, and the scale ring 37 is moved by the threaded guide spiral of the support member 40; one end of the torsional elastic element 36 is connected to the rotating member 35, and the other end is fixed by the support member 40. When the rotating member 35 rotates in the forward direction, the torsional elastic element 36 is driven to twist to generate injection driving energy.

[0098] The actual injection process of the push-in assembly of the present invention is as follows: the pressing member 11 is pressed, and the pressing member 11 pushes the gasket 14, the positioning member 15, the biasing device 32, and the sounding member 33 to move toward the injection output end 410, and the biasing engagement portion 324 of the biasing device 32 engages with the second engagement portion 211 of the piston rod unit 20, and the biasing engagement portion 324 of the biasing device 32 disengages from the first engagement portion 134 of the torsion member 13, and the pressing member 11 is continued to be pressed until the third engagement portion 152 of the positioning member 15 disengages from the fixing seat 31, at which time the torsion elastic element 36 releases the injection driving energy, driving the rotating member 35, the scale ring 37, the sounding member 33, the biasing device 32, the positioning member 15, the linkage member 21, and the piston rod 22 to rotate, and the scale ring 37 is guided by the thread of the support member 40 to move and reset, and the piston rod 22 is guided by the thread of the support member 40 to move and perform the push-in operation.

[0099] The present invention also discloses an injection device, comprising a dose accumulation component and the above-mentioned push injection component, wherein the dose accumulation component is arranged between the torsion member 13 and the support member 40; a medicine storage unit 60 is arranged on the support member 40, and the piston rod unit 20 is used to push the medicine liquid in the medicine storage unit 60 toward the injection output end 410.

[0100] In this embodiment, the injection output end 410 may be provided with an injection needle 70. The medicine storage unit 60 includes a medicine bin and a medicine bottle 50 disposed in the medicine bin. Of course, the medicine storage unit 60 may also be configured as other, as long as it can be used to store medicine.

[0101] Specifically, the dose accumulation assembly includes a worm wheel 12 rotatably mounted on the torsion member 13 and a spiral track 416 disposed on the support member 40, wherein the worm wheel 12 is meshed with the spiral track 416. During the dose setting process, the torsion member 13 is rotated, and the worm wheel 12 is rotated under the driving of the rotating member and the spiral track 416, so that the total number of rotations of the torsion member 13 for all injection times can be reflected by the total number of rotations of the worm wheel 12. The worm wheel 12 is also provided with a worm wheel 12 stopper. In this embodiment, the torsion member 1313 drives the worm wheel 1212 to rotate. When the torsion member 1313 rotates one circle, the worm wheel 1212 rotates one tooth of the worm wheel 12. When the dose reaches the maximum dose value, the torsion member 13 is fitted with the worm wheel 12 stopper and cannot rotate. At this time, the dose setting cannot be performed, so that the total maximum injection amount of all injection times can be limited by the dose accumulation assembly, and the safety of use can be ensured.

[0102] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A push injection assembly, characterized in that: It includes a supporting member, a torsion member, a pressing member, an elastic reset member, an elastic force storage mechanism, a biasing device and a piston rod unit; The support member is provided with an injection output end; The torsion member is provided with a first engaging portion and an insertion slot; The elastic force storage mechanism is used to generate injection driving energy; The piston rod unit is installed in the support member and is provided with a second engaging portion; The biaser is provided with a biasing engagement portion; the biaser can move between a first working position and a second working position; when the biaser is in the first working position, the biasing engagement portion is separated from the second engagement portion and engaged with the first engagement portion of the torsion member so as to rotate the elastic force storage mechanism through the biaser when the torsion member rotates; when the biaser is in the second working position, the biasing engagement portion is separated from the first engagement portion and engaged with the second engagement portion of the piston rod unit so as to transfer the injection driving energy of the elastic force storage mechanism to the piston rod unit; The pressing member is provided with a push arm, which is movably inserted in the insertion slot; the pressing member is used to apply a thrust to the biasing device when moving in a direction close to the injection output end so as to move the biasing device to the second working position; The elastic reset member is used to provide an elastic force to cause the biasing device to reset to the first working position.

2. The push injection assembly according to claim 1, characterized in that The elastic force storage mechanism comprises a torsion elastic element and a rotating member, wherein the rotating member is rotatably installed in the supporting member, one end of the torsion elastic element is connected to the rotating member, and the other end is connected to the supporting member.

3. The push injection assembly according to claim 2, characterized in that The elastic force storage mechanism is used to generate injection driving energy when rotating in the forward direction. The elastic force storage mechanism also includes a sound-generating member, which rotates synchronously with the rotating member and can move relative to the rotating member. The injection assembly also includes a positioning member. The positioning member is movably installed in the support member, and a third engaging portion for engaging with the support member is provided on the positioning member. When the third engaging portion of the positioning member engages with the support member, the positioning member is anti-rotationally engaged with the support member and is used to position the sound-generating member. When the biaser is located in the first working position, the third engaging portion of the positioning member engages with the support member. When the biaser is located in the second working position, the third engaging portion of the positioning member is separated from the support member. The pressing member is used to apply a thrust to the positioning member and the sound-generating member when moving in a direction close to the injection output end so that the positioning member and the sound-generating member move in a direction close to the injection output end so that the third engaging portion is separated from the support member. The elastic reset member is used to apply an elastic force directed to the positioning member to the sound-generating member, and the elastic reset member is also used to provide an elastic force that causes the positioning member to reset to the third engaging portion to engage with the support member.

4. The push injection assembly according to claim 3, characterized in that The positioning member is provided with a plurality of one-way teeth arranged circumferentially, and the sound-generating member is provided with a plurality of bevel teeth for meshing with the one-way teeth of the positioning member.

5. The push injection assembly according to claim 4, characterized in that The elastic reset member abuts between the rotating member and the sound-generating member; the biasing device is provided with a flange portion for abutting between the positioning member and the sound-generating member; and the push arm of the pressing member faces the positioning member.

6. The push injection assembly according to claim 5, characterized in that The sound-generating member is movably mounted outside the biasing device, and a sound-generating member action surface is provided on the sound-generating member. The biasing device is provided with a biasing action surface for pushing the sound-generating member action surface when the biasing device rotates forward to enable the sound-generating member to rotate forward; when the biasing device is located at the second working position, the sound-generating member action surface is used to push the biasing action surface when reverse rotation occurs to enable the biasing device to rotate reversely.

7. The push injection assembly according to claim 6, characterized in that The sounding piece is provided with a sounding piece guiding inclined surface; the biasing device is provided with a biasing guiding inclined surface for slidingly cooperating with the sounding piece guiding inclined surface and for pushing the sounding piece guiding inclined surface when the biasing device is located at the first working position and rotates in the reverse direction to make the sounding piece shift and separate from the positioning member.

8. The push injection assembly according to claim 7, characterized in that The biasing device is provided with a first biasing protrusion and a second biasing protrusion, the biasing action surface is provided on one side of the first biasing protrusion, the other side of the first biasing protrusion is formed as a biasing stop position, the biasing guiding inclined surface is formed on the second biasing protrusion, the sounding member is provided with a first sounding member groove for movably embedding the first biasing protrusion and a second sounding member groove for embedding the second biasing protrusion, the groove side wall of the first sounding member groove opposite to the biasing action surface is formed as a sounding member action surface, the groove side wall of the first sounding member groove opposite to the biasing stop position is formed as a sounding member stop position, and the groove side wall of the second sounding member groove opposite to the biasing guiding inclined surface is formed as a sounding member guiding inclined surface; When the action surface of the sounding member and the biased action surface are in contact with each other, there is a gap between the biased stop position and the stop position of the sounding member; when the biasing device is located in the first working position and rotates in the opposite direction to use the biased guide inclined surface to push the guide inclined surface of the sounding member, when the biased stop position and the stop position of the sounding member are in contact with each other, the sounding member is separated from the positioning member.

9. The push injection assembly according to claim 1, characterized in that When the biasing engagement portion is engaged with the first engagement portion, the torsion member and the biaser are synchronously rotated and matched; when the biasing engagement portion is engaged with the second engagement portion, the biaser and the piston rod unit are synchronously rotated and matched.

10. The push injection assembly according to claim 1, characterized in that The piston rod unit includes a linkage, a piston rod and a piston, wherein the linkage is rotatably mounted in a supporting member, and the second engaging portion is arranged on the linkage; the piston rod is threadedly connected to the supporting member, the piston rod rotates synchronously with the linkage and can move relative to the linkage; the piston is arranged on the piston rod.

11. The push injection assembly according to claim 1, characterized in that The twisting member is rotatably mounted on the supporting member, and the elastic force storage mechanism is located inside the supporting member; the pressing member is movably mounted on the twisting member.

12. An injection device, characterized in that It comprises a dose accumulation component and a push injection component as described in any one of claims 1 to 11, wherein the dose accumulation component is arranged between the torsion member and the support member; a medicine storage unit is arranged on the support member, and the piston rod unit is used to push the medicine liquid in the medicine storage unit toward the injection output end.

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