Sound production structure and syringe

Abstract

The utility model relates to medical equipment technical field especially, and it is a kind of sounding structure and syringe, its sounding structure includes by front to rear setting in proper order fixed buckle, knob and jumping ring;The rear side of fixed buckle is equipped with multiple sounding lugs around its axis, knob is equipped with the perforation through and through along front-back direction, and the poking arm that passes through perforation is equipped on jumping ring;It further includes force application component, and force application component is used to apply the force towards knob to fixed buckle and / or jumping ring, to make the poking arm abut on the rear side of fixed buckle or sounding lug, when knob rotates, make the poking arm can line contact or point contact on sounding lug, the area of the contact of both is smaller, the pitch of the sound emitted is higher, can produce relatively crisp, larger sound, to make user can clearly hear the sound produced by twisting knob, to make user can better perceive and judge dose adjustment.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a sound-generating structure and a syringe. Background Technology

[0002] In the medical field, injection pens are widely used for injecting drugs such as insulin and growth hormone due to their ease of use and convenient dosage adjustment. Most existing injection pens employ a rotary adjustment mechanism, where the user rotates a knob on the pen to drive relative movement of internal components, thereby adjusting the injection dosage. In the aforementioned adjustment process, to ensure the user can perceive the dosage adjustment action, existing technologies typically design the two planes of the injection pen to collide during relative movement, using the resulting sound to alert the user. However, in actual use, some users have reported that the sound produced by the collision of the two planes is not crisp or loud enough, and in some environments, it is difficult for users to hear the sound clearly, thus affecting their perception and judgment of dosage adjustment. Utility Model Content

[0003] The purpose of this invention is to provide a sound-generating structure and syringe to solve the technical problem that the sound emitted when the user twists the syringe pen for adjustment is too soft, making it difficult for the user to hear clearly, thus affecting the user's perception and judgment of dosage adjustment.

[0004] To achieve the above objectives, this utility model provides a sound-generating structure, comprising a fixing buckle, a knob, and a jumping ring arranged sequentially from front to back; The rear side of the fixing buckle is provided with multiple sound-emitting protrusions around its axis, the knob is provided with a through hole in the front-back direction, and the jumping ring is provided with a toggle arm passing through the through hole. It also includes a force-applying component for applying a force toward the knob to the retaining buckle and / or the jumping ring, so that the toggle arm abuts against the rear side of the retaining buckle or the sound-emitting protrusion, and when the knob is rotated, the toggle arm can make line contact or point contact with the sound-emitting protrusion.

[0005] Optionally, the force-applying component is located at the rear end of the jumping ring, and the force-applying component is used to apply a forward force to the jumping ring.

[0006] Optionally, the rear end of the actuating arm to the front end of the actuating arm is obliquely forward along a first direction, the sound-emitting protrusion is toothed, the tooth surface of the sound-emitting protrusion relative to the first direction is designated as a first tooth surface, the tooth surface of the sound-emitting protrusion relative to the tooth surface of the second direction is designated as a second tooth surface, and there is a first included angle α between the extension direction of the actuating arm and the second tooth surface, the degree of the first included angle α is less than 90° and greater than 0°.

[0007] Optionally, the end of the perforation relative to the first direction is designated as the first end, and the end of the perforation relative to the second direction is designated as the second end. The front side of the jumping ring is provided with an abutting arm around its axis. The abutting arm passes through the perforation. The actuating arm and the abutting arm are respectively spaced apart on both sides of the perforation. The actuating arm abuts against the second end, and the abutting arm abuts against the first end. When the knob is rotated in the first direction, the second end can abut against the toggle arm to drive the jumping ring to rotate; when the knob is rotated in the second direction, the first end can abut against the abutment arm to drive the jumping ring to rotate.

[0008] Optionally, the front end of the abutment arm is located inside the perforation.

[0009] Optionally, the first end is provided with a first abutting surface, which is parallel to the extension direction of the abutting arm and can make surface contact with the abutting arm; the second end is provided with a second abutting surface, which is parallel to the extension direction of the actuating arm and can make surface contact with the actuating arm.

[0010] Optionally, the bouncing ring is provided with a through hole, which extends through the bouncing ring in the front-to-back direction, and the two ends of the through hole are respectively provided for the actuating arm and the abutting arm.

[0011] Optionally, a plane perpendicular to the axis of the knob is designated as the first plane, a second included angle b is provided between the extension direction of the toggle arm and the first plane, a third included angle c is provided between the first tooth surface and the first plane, and a fourth included angle d is provided between the second tooth surface and the first plane. The first included angle a has a degree of 1° to 3°, the second included angle b has a degree of 50° to 70°, the third included angle c has a degree of 20° to 40°, and the fourth included angle d has a degree of 50° to 70°.

[0012] Optionally, the jumping ring and the actuating arm are made of a material with an elastic modulus greater than or equal to 0.15 GPa.

[0013] Optionally, the knob is provided with a plurality of holes evenly distributed around its axis, and the jumping ring is provided with a plurality of toggle arms corresponding one-to-one with the holes.

[0014] This application also relates to a syringe having the aforementioned sound-generating structure.

[0015] Optionally, the device includes a housing, an injection assembly, and a cartridge bottle. The sound-generating structure is located at the rear end of the housing, and the cartridge bottle is located at the front end of the housing. The housing has a first receiving cavity, and the injection assembly is located within the first receiving cavity. A knob is connected to the injection assembly, and rotating the knob drives the injection assembly to eject an object from the cartridge bottle.

[0016] Optionally, the injection assembly includes an insert, a screw, a drive sleeve, and a torsion spring, wherein the insert, the torsion spring, the screw, and the drive sleeve are disposed within the first receiving cavity; The rear end of the housing is provided with a rear hole that passes through the first receiving cavity. The knob is rotatably located at the rear end of the housing and sleeved on the outside of the housing. The knob is provided with a knob through hole that passes through in the front-back direction. The insert rod passes through the rear hole and the knob through hole and protrudes rearward from the rear side of the knob. One of the outer wall of the insert rod and the hole wall of the knob through hole is provided with an adjustment linkage protrusion, and the other is provided with an adjustment linkage groove. The adjustment linkage protrusion is inserted into the adjustment linkage groove to make the insert rod and the knob linked. The torsion spring is disposed on the insert rod, and the insert rod and the drive sleeve are sequentially sleeved on the outside of the screw from back to front. The front end of the insert rod is provided with a first linkage part, and the outer side of the drive sleeve is provided with a second linkage part. The drive sleeve and the screw are linked around their axial direction, and the screw is threadedly connected to the housing. When the insertion rod moves forward to the point where the first linkage part connects to the second linkage part, the adjusting linkage protrusion and the adjusting linkage groove disengage, and the insertion rod and the drive sleeve are linked around their axis; When the drive sleeve rotates, it drives the screw to rotate, and the screw moves forward relative to the shell to push out the object inside the cartridge bottle.

[0017] Optionally, the injection assembly further includes a guide sleeve, which is fixedly disposed within the first receiving cavity, sleeved on the outside of the screw and located in front of the drive sleeve, the drive sleeve being rotatably connected to the guide sleeve, and the guide sleeve being threadedly connected to the screw.

[0018] Optionally, the force-applying component includes a spring and a button. The button is fixedly disposed at the rear end of the insertion rod, and the spring is sleeved on the outside of the insertion rod. The two ends of the spring are respectively connected to the front side of the button and the rear side of the jumping ring. The spring is used to apply forward pressure to the jumping ring.

[0019] Optionally, it also includes a front sleeve, which is disposed in the first receiving cavity. The front sleeve and the fixing buckle are sleeved on the outside of the insertion rod. The front sleeve is located in front of the fixing buckle. The front sleeve is fixedly connected to the insertion rod, and the fixing buckle is fixedly connected to the housing. The inner side of the front sleeve, the inner side of the fixing buckle, and the outer side of the insertion rod form a second receiving cavity. The torsion spring is sleeved on the outside of the insertion rod and located in the second receiving cavity. The two ends of the torsion spring are respectively connected to the front sleeve and the fixing buckle.

[0020] Optionally, the outer side of the shell is provided with an observation port that extends through the first receiving cavity, and the front sleeve includes a graduated cylinder. The graduated cylinder is sleeved on the outside of the insertion rod and is threadedly or slidably connected to the insertion rod. The graduated cylinder is provided corresponding to the observation port.

[0021] Optionally, the front sleeve further includes an inner cylinder and a sliding window. The inner cylinder is fixedly sleeved on the outside of the insert rod, and the bottom end of the inner cylinder is fixedly connected to the insert rod. The scale cylinder is slidably sleeved on the outside of the inner cylinder and connected to the inner cylinder. The outer wall of the scale cylinder is provided with a scale thread. The sliding window is threaded to the outside of the scale cylinder. The outer wall of the sliding window is provided with a viewing window that extends through to its inner wall. The sliding window is slidably connected to the shell along the axial direction of the shell. The observation port corresponds to the view window setting.

[0022] Optionally, the front sleeve further includes an inner cylinder, which is sleeved on the outside of the insertion rod. The outer wall of the insertion rod is provided with a support ring. The bottom end of the inner cylinder is fixedly connected to the support ring. The scale cylinder is sleeved on the outside of the inner cylinder and threadedly connected to the inner cylinder and the shell. The outer wall of the scale cylinder is provided with a scale thread, which corresponds to the observation port.

[0023] Compared with the prior art, the sound-generating structure implemented in this utility model has the following advantages: In the sound-generating structure of this utility model, the fixed buckle and the jumping ring are located in front of and behind the knob, respectively. The actuating arm of the jumping ring passes through the through hole of the knob and corresponds to the sound-generating protrusion of the fixed buckle. The force-applying component applies a force that brings one or both of the fixed buckle and the jumping ring closer to each other, so that the actuating arm can continuously abut against the sound-generating protrusion. Furthermore, when the knob is rotated, the through hole abuts against the side of the actuating arm, thereby driving the jumping ring to rotate, and thus causing the actuating arm to abut against each sound-generating protrusion in sequence, and the jumping ring moves forward and backward. As the direction shifts, and the actuating ring rotates, when the actuating arm passes the highest point of a sound-emitting bump and abuts against another tooth surface of that sound-emitting bump or another sound-emitting bump, a line contact or point contact impact occurs between the actuating arm and the tooth surface of the sound-emitting bump. The contact area between the two is small, and the pitch of the sound emitted is higher, producing a crisper and louder sound, so that the user can clearly hear the sound produced by turning the knob, thereby enabling the user to better perceive and judge the dosage adjustment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the sound-generating structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the sound-generating structure from another perspective.

[0026] Figure 3 This is a schematic diagram of the sound-generating structure of this utility model, ignoring the force-applying components and cut along the perforation.

[0027] Figure 4 for Figure 3 A magnified view of part A in the middle.

[0028] Figure 5 This is an exploded view of the sound-generating structure of this utility model.

[0029] Figure 6 This is an exploded view of the sound-generating structure of this utility model from another perspective.

[0030] Figure 7 This is a top view of the knob of this utility model.

[0031] Figure 8 This is a schematic diagram of the syringe of this utility model.

[0032] Figure 9 This is a schematic diagram of the syringe of this utility model cut in half.

[0033] Figure 10 This is an exploded view of the syringe of this utility model.

[0034] Figure 11 This is an exploded view of the syringe of this utility model from another perspective.

[0035] Figure 12 for Figure 11 A magnified view of part B in the middle.

[0036] Figure 13 for Figure 11 A magnified view of part C in the middle.

[0037] Figure 14 This is a schematic diagram of the syringe structure according to another embodiment of the present invention.

[0038] Figure 15 This is a schematic diagram of the syringe with the plunger, front sleeve, and shell cut in half, according to another embodiment of the present invention.

[0039] Figure 16 This is an exploded view of the syringe plunger, front sleeve, and casing of another embodiment of the present invention.

[0040] Reference numerals: 1. Insert rod; 11. Rod through hole; 12. Second snap-fit ​​part; 13. Support ring; 14. First linkage part; 2. Drive sleeve; 21. First sleeve through hole; 22. Second rod sleeve linkage protrusion; 23. Second linkage part; 3. Screw; 31. Second rod sleeve linkage groove; 32. Drive external thread; 4. Guide sleeve; 41. Second sleeve through hole; 42. Ring groove; 43. Impact groove; 5. Torsion spring; 6. Shell; 61. First receiving cavity; 62. Rear hole; 63. Observation port; 7. Cartridge bottle; 8. Front sleeve; 81. Sliding window; 811. Connecting thread; 812. Window; 82. Inner cylinder; 83. Scale cylinder; 831. Scale thread; 9. Positioning ring; 10. 101. Knob; 102. Through hole; 1021. First end; 10211. First abutting surface; 1022. Second end; 10221. Second abutting surface; 20. Button; 201. First locking part; 30. Spring; 40. Cover; 50. Viewing window cover; 60. Jumping ring; 601. Toggle arm; 602. Abutting arm; 603. Through hole; 70. Fixing buckle; 701. Sound-emitting protrusion; 7011. First toothed surface; 7012. Second toothed surface; 80. Push block; 100a. First rod sleeve linkage protrusion; 100b. First rod sleeve linkage groove; 200a. Adjustment linkage protrusion; 200b. Adjustment linkage groove; 300. Second receiving cavity. Detailed Implementation

[0041] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0042] In the description of this utility model, it should be understood that the terms "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] like Figures 1 to 7 As shown, a sound-generating structure of this utility model includes a fixing buckle 70, a knob 10, and a vibrating ring 60 arranged sequentially from front to back. The rear side of the fixing buckle 70 is provided with a plurality of sound-generating protrusions 701 around its axis. The knob 10 is provided with a through hole 102 extending in the front-back direction. The vibrating ring 60 is provided with a toggle arm 601 passing through the through hole 102. It also includes a force-applying component, which is used to apply a force toward the knob 10 to the fixing buckle 70 and / or the vibrating ring 60, so that the toggle arm 601 abuts against the rear side of the fixing buckle 70 or the sound-generating protrusions 701. When the knob 10 is rotated, the toggle arm 601 can make line contact or point contact with the sound-generating protrusions 701.

[0045] In the above technical solution, the fixing buckle 70 and the jumping ring 60 are located in front of and behind the knob 10, respectively. The actuating arm 601 of the jumping ring 60 passes through the through hole 102 of the knob 10 and corresponds to the sound-emitting protrusion 701 of the fixing buckle 70. The force-applying component applies a force to one or both of the fixing buckle 70 and the jumping ring 60 to bring them closer together, so that the actuating arm 601 can continuously abut against the sound-emitting protrusion 701. Furthermore, when the knob 10 is rotated, the through hole 102 abuts against the side of the actuating arm 601 to drive the jumping ring 60 to rotate, thereby causing the actuating arm 601 to abut against each sound-emitting protrusion 70 in sequence. 1. Furthermore, the jumping ring 60 jumps in the front-to-back direction. When the jumping ring 60 rotates and the toggle arm 601 passes the highest point of a sound-emitting protrusion 701 and abuts against another tooth surface of the sound-emitting protrusion 701 or another tooth surface of the sound-emitting protrusion 701, a line contact or point contact impact occurs between the toggle arm 601 and the tooth surface of the sound-emitting protrusion 701. The contact area between the two is small, and the pitch of the sound emitted is higher, which can produce a crisper and louder sound, so that the user can clearly hear the sound produced by turning the knob 10, thereby enabling the user to better perceive and judge the dosage adjustment.

[0046] The force-applying component can be an elastic element (such as a fixedly installed spring 30). The force-applying component continuously applies a force to one or both of the fixed buckle 70 and the jumping ring 60 through elastic potential energy, causing them to move closer together. Additionally, the actuating arm 601 can be a plate-shaped component extending rearward or obliquely rearward, and the sound-generating protrusion 701 can be a triangular block-shaped component, a trapezoidal block-shaped component, or a rectangular block-shaped component, etc. Furthermore, multiple actuating arms 601 are preferably evenly distributed to ensure the balance of the jumping ring 60, and the through holes 102 are provided one-to-one with the actuating arms 601. The edge of the actuating arm 601 at the point of contact with the sound-generating protrusion 701 can be a long strip edge, an arc-shaped edge, or a zigzag edge. When the aforementioned edge of the actuating arm 601 is an arc-shaped edge or a zigzag edge, point contact impact occurs between the actuating arm 601 and the toothed surface of the sound-generating protrusion 701.

[0047] In addition, in this embodiment, the first direction and the second direction are opposite circumferential directions. Specifically, the first direction can be clockwise and the second direction can be counterclockwise.

[0048] Furthermore, the force-applying component is located at the rear end of the jumping ring 60. The force-applying component is used to apply a forward force to the jumping ring 60 so that the force-applying component can be mounted on the syringe and prevent the force-applying component from obstructing the mounting of other parts of the syringe.

[0049] Furthermore, the rear end of the toggle arm 601 to the front end of the toggle arm 601 is obliquely forward along the first direction, the sound-emitting protrusion 701 is toothed, the tooth surface of the sound-emitting protrusion 701 relative to the tooth surface in the first direction is designated as the first tooth surface 7011, the tooth surface of the sound-emitting protrusion 701 relative to the tooth surface in the second direction is designated as the second tooth surface 7012, and there is a first included angle α between the extension direction of the toggle arm 601 and the second tooth surface 7012, the degree of the first included angle α is less than 90° and greater than 0°.

[0050] Since the rear end of the actuating arm 601 to the front end of the actuating arm 601 is obliquely forward along the first direction, the actuating arm 601 and the first tooth surface 7011 cannot be parallel. The actuating arm 601 and the first tooth surface 7011 must have an included angle of less than 90° and greater than 0°. When the actuating arm 601 and the first tooth surface 7011 come into contact, it is a line contact or a point contact. Since when the first included angle α is 0°, the actuating arm 601 and the second tooth surface 7012 are parallel and the actuating arm 601 and the second tooth surface 7012 are in surface contact, in order to make the actuating arm 601 and the second tooth surface 7012 in contact a line contact or a point contact, the degree of the first included angle α is less than 90° and greater than 0°.

[0051] Furthermore, the end of the perforation 102 relative to the first direction is designated as the first end 1021, and the end of the perforation 102 relative to the second direction is designated as the second end 1022. The front side of the jumping ring 60 is provided with an abutment arm 602 around its axis. The abutment arm 602 passes through the perforation 102. The actuating arm 601 and the abutment arm 602 are respectively spaced apart on both sides of the perforation 102. The actuating arm 601 abuts against the second end 1022, and the abutment arm 602 abuts against the first end 1021. When the knob 10 is rotated in the first direction, the second end 1022 can abut against the actuating arm 601 to drive the jumping ring 60 to rotate. When the knob 10 is rotated in the second direction, the first end 1021 can abut against the abutment arm 602 to drive the jumping ring 60 to rotate.

[0052] The knob 10 rotates by abutting the actuating arm 601 at its second end 1022, causing the jumping ring 60 to rotate in the first direction, and by abutting the abutting arm 602 at its first end 1021, causing the jumping ring 60 to rotate in the second direction. This shortens the response time of the knob 10 in causing the jumping ring 60 to rotate, so that when the knob 10 rotates in the first direction, it can immediately cause the jumping ring 60 to rotate in the first direction, and when the knob 10 rotates in the second direction, it can immediately cause the jumping ring 60 to rotate in the second direction. In addition, the through hole 102 can be an elongated hole extending circumferentially along the knob 10.

[0053] In other embodiments, only the toggle arm 601 may be provided. When the knob 10 is rotated in the first direction, the second end 1022 can abut against the toggle arm 601 to drive the jumping ring 60 to rotate. When the knob 10 is rotated in the second direction, the first end 1021 can abut against the toggle arm 601 to drive the jumping ring 60 to rotate. The first end 1021 and the second end 1022 can abut against the toggle arm 601 at the same time to circumferentially position the toggle arm.

[0054] Furthermore, the front end of the abutment arm 602 is located inside the perforation 102 to avoid contact between the abutment arm 602 and the sound-generating protrusion 701.

[0055] Furthermore, the first end 1021 is provided with a first abutting surface 10211, which is parallel to the extension direction of the abutting arm 602 and can make surface contact with the abutting arm 602. The second end 1022 is provided with a second abutting surface 10221, which is parallel to the extension direction of the actuating arm 601 and can make surface contact with the actuating arm 601.

[0056] During dose adjustment, rotating the knob 10 in the second direction causes the first contact surface 10211 to press against the contact arm 602, while the sound-emitting protrusion 701 presses against the actuating arm 601. Under the combined force, the jumping ring 60 is first lifted backward, reducing the engagement depth between the actuating arm 601 and the sound-emitting protrusion 701. Therefore, the force required for the actuating arm 601 to slide over the sound-emitting protrusion 701 is smaller, meaning the adjustment force of the knob 10 is smaller and less strenuous, improving the user's dose adjustment experience. Moreover, there is a certain circumferential distance between the actuating arm 601 and the contact arm 602. During dose adjustment, the force-bearing area of ​​the jumping ring 60 is larger. At least two actuating arms 601 and two contact arms 602 are evenly distributed along the axial direction of the jumping ring 60, ensuring that the force on the jumping ring 60 is stable and uniform during the backward lifting process.

[0057] The first contact surface 10211 contacts the contact arm 602 and the second contact surface 10221 contacts the toggle arm 601, which enables the knob 10 to drive the jumping ring 60 to rotate more smoothly. Furthermore, due to the increased contact area and reduced pressure, the service life of the components can be extended.

[0058] Furthermore, the jumping ring 60 is provided with a through hole 603, which passes through the jumping ring 60 in the front-to-back direction. The two ends of the through hole 603 are respectively provided for the actuating arm 601 and the abutting arm 602.

[0059] Since a through hole 603 is provided between the actuating arm 601 and the abutting arm 602, the actuating ring 60 can be manufactured by the following process: cutting the through hole 603 along the two long sides of the actuating ring 60 in the circumferential direction, then cutting the position of the through hole 603 in the radial direction along the actuating ring 60, and then bending the two opposite protrusions obtained by cutting downwards to obtain the actuating arm 601 and the abutting arm 602; in summary, the actuating arm 601 and the abutting arm 602 can be manufactured by subtractive processing and bending, instead of additive processing, which reduces manufacturing costs and manufacturing difficulty and simplifies the processing steps; in addition, the through hole 603 can be an elongated hole extending along the circumference of the knob 10.

[0060] Furthermore, a plane perpendicular to the axis of the knob 10 is designated as the first plane, a second included angle b is provided between the extension direction of the toggle arm 601 and the first plane, a third included angle c is provided between the first tooth surface 7011 and the first plane, and a fourth included angle d is provided between the second tooth surface 7012 and the first plane; the degree of the first included angle a is 1° to 3°, the degree of the second included angle b is 50° to 70°, the degree of the third included angle c is 20° to 40°, and the degree of the fourth included angle d is 50° to 70°.

[0061] Specifically, by limiting the angles of the first included angle, the second included angle, and the third included angle, the sound emitted when the toggle arm 601 and the sound-emitting protrusion 701 collide in line or point contact is increased, while minimizing the risk of damage to the sound-emitting protrusion 701 by the toggle arm 601 and the risk of deformation of the toggle arm 601 is minimized.

[0062] Specifically, the first included angle a is preferably 1.5°, the second included angle b is preferably 63°, the third included angle c is preferably 24.5°, and the fourth included angle d is preferably 61.5°.

[0063] Furthermore, the actuating ring 60 and the actuating arm 601 are made of a material with an elastic modulus greater than or equal to 0.15 GPa, which gives the actuating ring 60 and the actuating arm 601 a certain strength to avoid large deformation of the actuating ring 60 and the actuating arm 601. If the deformation is large, phenomena such as slippage may occur, which will lead to inaccurate adjustment. In addition, the actuating ring 60 and the actuating arm 601 can be made of metal or polymer material.

[0064] Furthermore, the knob 10 is provided with a plurality of perforations 102 evenly distributed around its axis, and the jumping ring 60 is provided with a plurality of toggle arms 601 corresponding one-to-one with the perforations 102 to ensure the balance of the jumping ring 60.

[0065] Reference Figures 8 to 16 As shown, this embodiment also relates to a syringe having the aforementioned sound-generating structure.

[0066] Furthermore, the device includes a housing 6, an injection assembly, and a cartridge bottle 7. The sound-generating structure is located at the rear end of the housing 6, and the cartridge bottle 7 is located at the front end of the housing 6. The housing 6 has a first receiving cavity 61, and the injection assembly is located in the first receiving cavity 61. A knob 10 is connected to the injection assembly, and rotating the knob 10 drives the injection assembly to eject the object from the cartridge bottle 7.

[0067] The contents of the vial 7 can be a drug. The user can drive the sound-emitting structure to move the injection component and dispense the drug.

[0068] The further injection assembly includes a plunger 1, a screw 3, a drive sleeve 2, and a torsion spring 5. The plunger 1, torsion spring 5, screw 3, and drive sleeve 2 are disposed within the first receiving cavity 61. The rear end of the housing 6 is provided with a rear hole 62 that penetrates the first receiving cavity 61. A knob 10 is rotatably disposed at the rear end of the housing 6 and sleeved on the outside of the housing 6. The knob 10 is provided with a knob through hole 101 that extends in the front-rear direction. The plunger 1 passes through the rear hole 62 and the knob through hole 101 and protrudes rearward from the rear side of the knob 10. One of the outer wall of the plunger 1 and the hole wall of the knob through hole 101 is provided with an adjusting linkage protrusion 200a, and the other is provided with an adjusting linkage groove 200b. The adjusting linkage protrusion 200a is inserted into the adjusting linkage groove. The groove 200b links the insert rod 1 and the knob 10. The torsion spring 5 is provided on the insert rod 1. The insert rod 1 and the drive sleeve 2 are sequentially sleeved on the outside of the screw 3 from back to front. The front end of the insert rod 1 is provided with a first linkage part 14, and the outer side of the drive sleeve 2 is provided with a second linkage part 23. The drive sleeve 2 and the screw 3 are linked around their axis. The screw 3 is threadedly connected to the shell 6. When the insert rod 1 moves forward to the point where the first linkage part 14 is connected to the second linkage part 23, the adjusting linkage protrusion 200a and the adjusting linkage groove 200b disengage, and the insert rod 1 and the drive sleeve 2 are linked around their axis. When the drive sleeve 2 rotates, the drive sleeve 2 drives the screw 3 to rotate, and the screw 3 moves forward relative to the shell 6 to push out the object in the cartridge bottle 7.

[0069] The operation of the syringe is as follows: The user holds the shell 6 and rotates the knob 10. The knob 10 drives the plunger 1 to rotate through the adjusting linkage protrusion 200a and adjusting linkage groove 200b. The rotation of the plunger 1 drives the torsion spring 5 to rotate. The torsion spring 5 stores elastic potential energy. Then the user presses the plunger 1 forward, and the plunger 1 moves forward to the first linkage part 14, which connects to the second linkage part 23. The adjusting linkage protrusion 200a and adjusting linkage groove 200b disengage, and the torsion spring 5 releases its elastic potential energy. The torsion spring 5 drives the plunger 1 to rotate, which in turn drives the drive sleeve 2 to rotate. The drive sleeve 2 drives the screw 3 to rotate, and the screw 3 moves forward, pushing out the object inside the cartridge bottle 7. This object can be a drug.

[0070] The insert rod 1 is provided with a through hole 11 extending in the front-to-back direction, the drive sleeve 2 is provided with a first through hole 21 extending in the front-to-back direction, the guide sleeve 4 is provided with a second through hole 41 extending in the front-to-back direction, and the screw 3 is inserted into the through hole 11 and passes through the first through hole 21 and the second through hole 41, so that the insert rod 1, the drive sleeve 2 and the guide sleeve 4 are located on the outside of the screw 3.

[0071] Additionally, a pusher block 80 can be installed at the front end of the screw 3 to push out the object inside the cartridge bottle 7.

[0072] Furthermore, one of the inner side of the first linkage part 14 and the outer side of the second linkage part 23 is provided with a first rod sleeve linkage protrusion 100a and the other is provided with a first rod sleeve linkage groove 100b; when the insertion rod 1 moves forward until the first rod sleeve linkage protrusion 100a is inserted into the first rod sleeve linkage groove 100b, the insertion rod 1 and the drive sleeve 2 are linked together.

[0073] When the insertion rod 1 moves forward to correspond with the first linkage part 14 and the second linkage part 23, and the first linkage protrusion 100a of the first rod sleeve is inserted into the first linkage groove 100b, the insertion rod 1 rotates, and the side of the first linkage protrusion 100a abuts against the side of the first linkage groove 100b, so as to push the drive sleeve 2 to rotate, thereby realizing the linkage between the insertion rod 1 and the drive sleeve 2.

[0074] Furthermore, the outer side of the screw 3 is provided with a second rod sleeve linkage groove 31 extending in the front-back direction, and the hole wall of the first through hole 21 is provided with a second rod sleeve linkage protrusion 22. The second rod sleeve linkage protrusion 22 is inserted into the second rod sleeve linkage groove 31, so that the screw 3 and the drive sleeve 2 are linked. The outer side of the screw 3 is provided with a drive external thread 32 extending in the front-back direction, and the inner side wall of the second through hole 41 is provided with a drive internal thread extending in the front-back direction. The drive external thread 32 is connected to the drive internal thread, and the limiting sleeve is threadedly connected to the drive external thread 32.

[0075] The second sleeve linkage protrusion 22 abuts against the side of the second sleeve linkage groove 31, enabling the drive sleeve 2 to drive the screw 3 to rotate. The movement of the screw 3 in the front-back direction does not affect the drive sleeve 2. The drive external thread 32 is connected to the drive internal thread, allowing the screw 3 to move in the front-back direction when it rotates. In addition, the second sleeve linkage protrusion 22 and the second sleeve linkage groove 31 can be multiple evenly distributed. The second sleeve linkage protrusion 22 can be a claw-shaped protrusion to be firmly connected to the second sleeve linkage groove 31. Furthermore, the second sleeve linkage groove 31 should be formed on the outer surface of the drive external thread 32 and the screw 3.

[0076] Furthermore, the injection assembly also includes a guide sleeve 4, which is fixedly disposed within the first receiving cavity 61. The guide sleeve 4 is sleeved on the outside of the screw 3 and located in front of the drive sleeve 2. The drive sleeve 2 is rotatably connected to the guide sleeve 4, and the guide sleeve 4 is threadedly connected to the screw 3.

[0077] The guide sleeve 4 is fixed to the housing 6 and is used for positioning and connecting the drive sleeve 2 and the screw 3.

[0078] Furthermore, the force-applying component includes a spring 30 and a button 20. The button 20 is fixedly mounted on the rear end of the insert rod 1, and the spring 30 is sleeved on the outside of the insert rod 1. The two ends of the spring 30 are respectively connected to the front side of the button 20 and the rear side of the jumping ring 60. The spring 30 is used to apply forward pressure to the jumping ring 60. The button 20 is used to facilitate user pressing, and the spring 30 is used to provide continuous forward pressure through its elastic potential energy to increase the torque required when rotating the knob 10, thereby increasing the accuracy of rotation.

[0079] Furthermore, the front side of the button 20 is provided with a first snap-fit ​​part 201, and the wall of the rod through hole 11 is provided with a second snap-fit ​​part 12. The first snap-fit ​​part 201 is inserted into the rod through hole 11 and snapped into the second snap-fit ​​part 12. The two ends of the spring 30 are respectively connected to the button 20 and the knob 10. The first snap-fit ​​part 201 and the second snap-fit ​​part 12 are snapped together to facilitate the installation of the button 20 on the rear end of the rod 1.

[0080] Furthermore, it also includes a front sleeve 8, which is disposed in the first receiving cavity 61. The front sleeve 8 and the fixing buckle 70 are sleeved on the outside of the insertion rod 1. The front sleeve 8 is located in front of the fixing buckle 70. The front sleeve 8 is fixedly connected to the insertion rod 1, and the fixing buckle 70 is fixedly connected to the shell 6. The inner side of the front sleeve 8, the inner side of the fixing buckle 70 and the outer side of the insertion rod 1 form a second receiving cavity 300. The torsion spring 5 is sleeved on the outside of the insertion rod 1 and located in the second receiving cavity 300. The two ends of the torsion spring 5 are respectively connected to the front sleeve 8 and the fixing buckle 70.

[0081] The two ends of the torsion spring 5 are connected to the movable front sleeve 8 and the fixed buckle 70, respectively. When the front sleeve 8 rotates, the torsion spring 5 releases or stores elastic potential energy.

[0082] Furthermore, the outer side of the housing 6 is provided with an observation port 63 that extends through the first receiving cavity 61. The front sleeve 8 includes a scale cylinder 83, which is sleeved on the outside of the insertion rod 1 and is threadedly or slidably connected to the insertion rod 1. The scale cylinder 83 is provided corresponding to the observation port 63 so that the user can observe the reading on the scale cylinder 83 through the observation port 63.

[0083] Reference Figures 7 to 13As shown, in some embodiments, a viewing window cover 50 is also included, which covers the observation port 63; the front sleeve 8 also includes an inner cylinder 82 and a sliding window 81. The inner cylinder 82 is fixedly sleeved on the outside of the insertion rod 1, and the bottom end of the inner cylinder 82 is fixedly connected to the insertion rod 1. The scale cylinder 83 is slidably sleeved on the outside of the inner cylinder 82 and connected to the inner cylinder 82. The outer wall of the scale cylinder 83 is provided with a scale thread 831. The sliding window 81 is threaded to the outside of the scale cylinder 83. The outer wall of the sliding window 81 is provided with a viewing window 812 that extends through to its inner wall. The sliding window 81 is slidably connected to the shell 6 along the axial direction of the shell 6; wherein, the observation port 63 is provided corresponding to the viewing window 812.

[0084] The outer wall of the graduated cylinder 83 corresponding to the viewing window 812 should be provided with an injection dosage mark. This injection dosage mark can be located between two adjacent graduated threads 831. When the insert rod 1 rotates, the insert rod 1 can drive the inner cylinder 82 to rotate, which in turn drives the graduated cylinder 83 to rotate, and drives the sliding window 81 to move in the front-back direction. At this time, the user can see the sliding window 81 moving through the viewing window cover 50, and can see the graduated thread 831 rotating in the viewing window 812. The injection dosage mark on the graduated thread 831 in the viewing window 812 can indicate the injection dosage corresponding to the current rotation amplitude. In addition, the outer wall of the insert rod 1 is provided with a support ring 13, and the bottom end of the inner cylinder 82 is fixedly connected to the support ring 13. In addition, the inner cylinder 82 can be snapped into the support ring 13.

[0085] Furthermore, it also includes a positioning ring 9, which is sleeved on the outside of the insertion rod 1 and connected to the housing 6. The positioning ring 9 is located between the positioning buckle and the scale cylinder 83. The positioning ring 9 is used to restrict the movement of the scale cylinder 83 and facilitate the installation of the syringe.

[0086] Reference Figures 14 to 16 As shown, in some other embodiments, the front sleeve 8 also includes an inner sleeve 82, which is sleeved on the outside of the insertion rod 1. The outer wall of the insertion rod 1 is provided with a support ring 13. The bottom end of the inner sleeve 82 is fixedly connected to the support ring 13. The scale cylinder 83 is sleeved on the outside of the inner sleeve 82 and threadedly connected to the inner sleeve 82 and the shell 6. The outer wall of the scale cylinder 83 is provided with a scale thread 831, which corresponds to the observation port 63.

[0087] The scale thread 831 corresponding to the observation port 63 should be equipped with an injection dosage mark. When the insert rod 1 rotates, the insert rod 1 can drive the inner cylinder 82 to rotate, which in turn drives the scale cylinder 83 to rotate. The scale cylinder 83 moves in the front and back direction. At this time, the user can see the rotation of the scale thread 831 through the observation port 63. The injection dosage mark on the scale thread 831 in the viewing window 812 can indicate the injection dosage corresponding to the current rotation amplitude.

[0088] Furthermore, the rear side of the guide sleeve 4 is provided with an annular groove 42 around its axis, and the groove wall of the annular groove 42 is provided with a plurality of impact grooves 43 evenly distributed. The front side of the drive sleeve 2 is provided with an annular protrusion around its axis, and the outer side wall of the annular protrusion is provided with an extension and an impact part connected in sequence. The extension direction of the extension and the extension direction of the impact part have an angle. The annular protrusion, the extension, and the impact part are all provided in the annular groove 42. The impact parts are arranged at intervals between the annular protrusions and are inserted into any of the impact grooves 43. When the drive sleeve 2 rotates, the impact parts impact and insert into other impact grooves 43 in sequence.

[0089] The impact part strikes the impact groove 43 and makes a sound to remind the user that an injection can be performed and that an injection is in progress. The user can also roughly judge the injection dosage by the number of sounds.

[0090] Furthermore, it also includes a cap 40, which is detachably installed on the front end of the housing 6 and spaced over the outside of the cartridge bottle 7. The cap 40 is used to protect the cartridge bottle 7 and is removed when the user needs to use it.

[0091] Furthermore, fixed setting and fixed connection refer to the fixed relative positional relationship of two components, including but not limited to fixing by connectors, fixing by welding, fixing by adhesive, fixing by integral molding, and fixing by snap-fit ​​connection.

[0092] Furthermore, sliding connection and sliding setting refer to the connection between two connected components, where one component can slide along a fixed trajectory on the other component, including but not limited to connection by sliding a slider into a groove, or connection by inserting a slider into a hole whose size and profile match the slider.

[0093] Furthermore, rotatable connection and rotatable setting refer to the ability of two connected components to rotate, including but not limited to connections via bearings or clearance fits.

[0094] Furthermore, the connectors include, but are not limited to, fasteners, straps, ropes, pneumatic connectors, hydraulic connectors, flanges, Velcro, and buttons.

[0095] In summary, this utility model embodiment provides a sound-generating structure, the technical effects of which are as follows: In the sound-generating structure of this utility model, the fixing buckle 70 and the jumping ring 60 are located in front of and behind the knob 10, respectively. The actuating arm 601 of the jumping ring 60 passes through the through hole 102 of the knob 10 and corresponds to the sound-generating protrusion 701 of the fixing buckle 70. The force-applying component applies a force to one or both of the fixing buckle 70 and the jumping ring 60 to bring them closer together, so that the actuating arm 601 can continuously abut against the sound-generating protrusion 701. Furthermore, when the knob 10 is rotated, the through hole 102 abuts against the side of the actuating arm 601 to drive the jumping ring 60 to rotate, thereby causing the actuating arm 601 to abut against each sound-generating protrusion 701 in sequence. 01, and the jumping ring 60 jumps in the front-to-back direction. Furthermore, when the jumping ring 60 rotates and the toggle arm 601 passes the highest point of a sound-emitting protrusion 701 and abuts against another tooth surface of the sound-emitting protrusion 701 or another tooth surface of the sound-emitting protrusion 701, a line contact or point contact impact occurs between the toggle arm 601 and the tooth surface of the sound-emitting protrusion 701. The contact area between the two is small, and the pitch of the sound emitted is higher, which can produce a crisper and louder sound, so that the user can clearly hear the sound produced by turning the knob 10, thereby enabling the user to better perceive and judge the dosage adjustment.

[0096] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A sound-generating structure, characterized in that, It includes a fixing buckle (70), a knob (10) and a jumping ring (60) arranged from front to back; The rear side of the fixing buckle (70) is provided with a plurality of sound-emitting protrusions (701) around its axis, the knob (10) is provided with a through hole (102) running through the front and rear direction, and the jumping ring (60) is provided with a toggle arm (601) passing through the through hole (102). It also includes a force-applying component for applying a force toward the knob (10) to the retaining buckle (70) and / or the jumping ring (60) so that the toggle arm (601) abuts against the rear side of the retaining buckle (70) or the sound-emitting protrusion (701), and when the knob (10) is rotated, the toggle arm (601) is able to make line contact or point contact with the sound-emitting protrusion (701).

2. The sound-generating structure according to claim 1, characterized in that, The force-applying component is located at the rear end of the jumping ring (60), and the force-applying component is used to apply a forward force to the jumping ring (60).

3. The sound-generating structure according to claim 1, characterized in that, The rear end of the actuating arm (601) to the front end of the actuating arm (601) is obliquely forward along a first direction. The sound-emitting protrusion (701) is toothed. The tooth surface of the sound-emitting protrusion (701) relative to the tooth surface in the first direction is designated as a first tooth surface (7011). The tooth surface of the sound-emitting protrusion (701) relative to the tooth surface in the second direction is designated as a second tooth surface (7012). There is a first included angle α between the extension direction of the actuating arm (601) and the second tooth surface (7012). The degree of the first included angle α is less than 90° and greater than 0°.

4. The sound-generating structure according to claim 3, characterized in that, The end of the perforation (102) relative to the first direction is designated as the first end (1021), and the end of the perforation (102) relative to the second direction is designated as the second end (1022). The front side of the jumping ring (60) is provided with an abutment arm (602) around its axis. The abutment arm (602) passes through the perforation (102). The actuating arm (601) and the abutment arm (602) are respectively spaced apart on both sides of the perforation (102). The actuating arm (601) abuts against the second end (1022), and the abutment arm (602) abuts against the first end (1021). When the knob (10) is rotated in the first direction, the second end (1022) can abut against the toggle arm (601) to drive the jumping ring (60) to rotate; When the knob (10) is rotated in the second direction, the first end (1021) can abut against the abutment arm (602) to drive the jumping ring (60) to rotate.

5. The sound-generating structure according to claim 4, characterized in that, The front end of the abutment arm (602) is located inside the perforation (102).

6. The sound-generating structure according to claim 4, characterized in that, The first end (1021) is provided with a first abutting surface (10211), which is parallel to the extension direction of the abutting arm (602) and can make surface contact with the abutting arm (602). The second end (1022) is provided with a second abutting surface (10221), which is parallel to the extension direction of the actuating arm (601) and can make surface contact with the actuating arm (601).

7. The sound-generating structure according to claim 4, characterized in that, The bouncing ring (60) is provided with a through hole (603), which passes through the bouncing ring (60) in the front-back direction. The two ends of the through hole (603) are respectively provided for the actuating arm (601) and the abutting arm (602).

8. The sound-generating structure according to claim 3, characterized in that, A plane perpendicular to the axis of the knob (10) is designated as the first plane, a second included angle b is provided between the extension direction of the toggle arm (601) and the first plane, a third included angle c is provided between the first tooth surface (7011) and the first plane, and a fourth included angle d is provided between the second tooth surface (7012) and the first plane. The first included angle a has a degree of 1° to 3°, the second included angle b has a degree of 50° to 70°, the third included angle c has a degree of 20° to 40°, and the fourth included angle d has a degree of 50° to 70°.

9. The sound-generating structure according to claim 1, characterized in that, The jumping ring (60) and the actuating arm (601) are made of a material with an elastic modulus greater than or equal to 0.15 GPa.

10. The sound-generating structure according to claim 1, characterized in that, The knob is provided with a plurality of perforations (102) evenly distributed around its axis, and the actuating ring (60) is provided with a plurality of toggle arms (601) corresponding one-to-one with the perforations.

11. A syringe, characterized in that, The device is provided with a sound-generating structure as described in any one of claims 1 to 10.

12. The syringe according to claim 11, characterized in that, The device includes a housing (6), an injection assembly, and a cartridge bottle (7). The sound-generating structure is located at the rear end of the housing (6), and the cartridge bottle (7) is located at the front end of the housing (6). The housing (6) has a first receiving cavity (61), and the injection assembly is located in the first receiving cavity (61). The knob (10) is connected to the injection assembly, and the knob (10) is rotated to drive the injection assembly to eject the object from the cartridge bottle (7).

13. The syringe according to claim 12, characterized in that, The injection assembly includes an insert (1), a screw (3), a drive sleeve (2), and a torsion spring (5), wherein the insert (1), the torsion spring (5), the screw (3), and the drive sleeve (2) are disposed in the first receiving cavity (61); The rear end of the shell (6) is provided with a rear hole (62) that passes through the first receiving cavity (61). The knob (10) is rotatably located at the rear end of the shell (6) and sleeved on the outside of the shell (6). The knob (10) is provided with a knob through hole (101) that passes through in the front-back direction. The insert (1) passes through the rear hole (62) and the knob through hole (101) and protrudes rearward from the rear side of the knob (10). One of the outer wall of the insert (1) and the hole wall of the knob through hole (101) is provided with an adjustment linkage protrusion (200a), and the other is provided with an adjustment linkage groove (200b). The adjustment linkage protrusion (200a) is inserted into the adjustment linkage groove (200b) so that the insert (1) and the knob (10) are linked. The torsion spring (5) is provided on the insert rod (1). The insert rod (1) and the drive sleeve (2) are sequentially sleeved on the outside of the screw (3) from back to front. The front end of the insert rod (1) is provided with a first linkage part (14). The outer side of the drive sleeve (2) is provided with a second linkage part (23). The drive sleeve (2) and the screw (3) are linked around its axial direction. The screw (3) is threadedly connected to the shell (6). When the insertion rod (1) moves forward to the point where the first linkage part (14) is connected to the second linkage part (23), the adjusting linkage protrusion (200a) and the adjusting linkage groove (200b) disengage, and the insertion rod (1) and the drive sleeve (2) are linked around their axis; When the drive sleeve (2) rotates, the drive sleeve (2) drives the screw (3) to rotate, and the screw (3) moves forward relative to the shell (6) to push out the object inside the cartridge bottle (7).

14. The syringe according to claim 13, characterized in that, The injection assembly also includes a guide sleeve (4), which is fixedly disposed in the first receiving cavity (61). The guide sleeve (4) is sleeved on the outside of the screw (3) and located in front of the drive sleeve (2). The drive sleeve (2) is rotatably connected to the guide sleeve (4), and the guide sleeve (4) is threadedly connected to the screw (3).

15. The syringe according to claim 13, characterized in that, The force-applying component includes a spring (30) and a button (20). The button (20) is fixedly disposed at the rear end of the insert rod (1). The spring (30) is sleeved on the outside of the insert rod (1). The two ends of the spring (30) are respectively connected to the front side of the button (20) and the rear side of the jumping ring (60). The spring (30) is used to apply forward pressure to the jumping ring (60).

16. The syringe according to claim 13, characterized in that, It also includes a front sleeve (8), which is disposed in the first receiving cavity (61). The front sleeve (8) and the fixing buckle (70) are sleeved on the outside of the insertion rod (1). The front sleeve (8) is located in front of the fixing buckle (70). The front sleeve (8) is fixedly connected to the insertion rod (1). The fixing buckle (70) is fixedly connected to the shell (6). The inner side of the front sleeve (8), the inner side of the fixing buckle (70) and the outer side of the insertion rod (1) form a second receiving cavity (300). The torsion spring (5) is sleeved on the outside of the insertion rod (1) and located in the second receiving cavity (300). The two ends of the torsion spring (5) are respectively connected to the front sleeve (8) and the fixing buckle (70).

17. The syringe according to claim 16, characterized in that, The outer side of the shell (6) is provided with an observation port (63) that extends through the first receiving cavity (61). The front sleeve (8) includes a scale cylinder (83). The scale cylinder (83) is sleeved on the outside of the insertion rod (1) and is threadedly or slidably connected to the insertion rod (1). The scale cylinder (83) is provided corresponding to the observation port (63).

18. The syringe according to claim 17, characterized in that, The front sleeve (8) also includes an inner cylinder (82) and a sliding window (81). The inner cylinder (82) is fixedly sleeved on the outside of the insert rod (1). The bottom end of the inner cylinder (82) is fixedly connected to the insert rod (1). The scale cylinder (83) is slidably sleeved on the outside of the inner cylinder (82) and connected to the inner cylinder (82). The outer wall of the scale cylinder (83) is provided with a scale thread (831). The sliding window (81) is threaded to the outside of the scale cylinder (83). The outer wall of the sliding window (81) is provided with a viewing window (812) that penetrates to its inner wall. The sliding window (81) is slidably connected to the shell (6) along the axial direction of the shell (6). The observation port (63) is set in relation to the view window (812).

19. The syringe according to claim 17, characterized in that, The front sleeve (8) also includes an inner sleeve (82), which is sleeved on the outside of the insertion rod (1). The outer wall of the insertion rod (1) is provided with a support ring (13). The bottom end of the inner sleeve (82) is fixedly connected to the support ring (13). The scale cylinder (83) is sleeved on the outside of the inner sleeve (82) and threadedly connected to the inner sleeve (82) and the shell (6). The outer wall of the scale cylinder (83) is provided with a scale thread (831), which corresponds to the observation port (63).

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