A telescopic curved inspection earpiece

Abstract

The utility model relates to the technical field of equipment inspection, specifically relates to a telescopic and bendable inspection listening rod, which comprises a first rod body, a second rod body, a third rod body, a tuning fork, a first spring and a switch device, the tuning fork is fixed at the outlet of the a end of the first rod body, the middle section of the second rod body adopts a spring structure, the spring structure can realize the bending function, the first rod body, the second rod body and the third rod body are assembled together through the sliding nesting mode, and the telescopic function of the first rod body, the second rod body and the third rod body is realized through the first spring and the switch device. The utility model can be telescopic and bendable, improves the convenience and accuracy of equipment inspection, and solves the inspection difficulty problem of the narrow space, high space or deep space of the equipment in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of equipment inspection technology, specifically to a retractable and bendable inspection probe. Background Technology

[0002] In the field of industrial equipment inspection and maintenance, a listening stick is an important auxiliary tool, widely used for detecting equipment operating status, locating potential faults, and monitoring abnormal sounds. Traditional listening sticks typically employ a fixed-length metal rod structure, with one end for contacting the equipment being inspected and the other end for transmitting sound to the operator's ear. However, this fixed structure has several limitations in practical use. For example, when the part of the equipment being inspected is located in a difficult-to-access location, such as a confined space, at a height, or deep inside the equipment, the length and rigid structure of a traditional listening stick make it difficult to operate flexibly and effectively contact the equipment being inspected.

[0003] Existing technologies also include telescopic listening rods. For example, the utility model patent with authorization announcement number CN219319574U discloses a telescopic listening rod that is easy to carry for chemical inspection, including a handle. The handle is provided with a telescopic device, which includes a rotatable threaded cylinder. When the threaded cylinder rotates, it can form a structure in which the telescopic device extends upward, thus having a telescopic function.

[0004] However, the stethoscope in this utility model patent can only extend and retract, and it requires manual rotation to extend and retract. It cannot pop out automatically, and it may become loose over time. Furthermore, the telescoping device is not made of a compact elastic component and cannot bend, so it cannot inspect narrow or deep spaces, thus affecting the accuracy and convenience of the inspection.

[0005] Therefore, in view of the shortcomings of existing technologies that cannot be stretched or bent, it is necessary to develop a new stretchable and bendable inspection stethoscope. Utility Model Content

[0006] The purpose of this invention is to solve the aforementioned problems in the existing technology and to provide a retractable and bendable inspection stethoscope.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A retractable and bendable inspection rod includes a first rod body, a second rod body, a third rod body, and a first spring. For example, the first rod body, the second rod body, and the third rod body can be made of common metal materials such as aluminum alloy and steel, which have good strength and lightness, or they can be made of carbon fiber. Since carbon fiber is more expensive, common metal materials are preferred.

[0009] The first, second, and third rods are all hollow cylindrical structures; the interiors of the first, second, and third rods are respectively the first rod cavity, the second rod cavity, and the third rod cavity; the middle section of the second rod adopts a spring structure, which enables bending.

[0010] The inner diameter of the first rod is not less than the outer diameter of the second rod, and the inner diameter of the second rod is not less than the outer diameter of the third rod;

[0011] The first rod is fitted over the second rod, and the second rod is fitted over the third rod. The b end of the second rod is movably connected to the a end of the third rod. The connection between the b end of the first rod and the a end of the second rod is the same as the connection between the b end of the second rod and the a end of the third rod, so that the first rod, the second rod and the third rod are assembled together by sliding nesting.

[0012] The first spring passes through the first rod chamber, the second rod chamber, and the third rod chamber. One end of the first spring is fixed to end a of the first rod by welding and gluing, and the other end of the first spring is fixed to end b of the third rod by welding and gluing.

[0013] A tuning fork is also fixed at the outlet of end a of the first rod. Several tuning forks can be arranged in a circular pattern. The center of this circle is then fixed to the end face of end a of the first rod or the periphery of the first rod chamber by welding or gluing through connecting rods.

[0014] Switching devices are provided at the b end of the first rod, the b end of the second rod, and the b end of the third rod.

[0015] When the first spring is compressed, the first rod, the second rod, and the third rod are in a compressed state, and the total length of the first rod, the second rod, and the third rod becomes shorter; when the first spring is extended, the first rod, the second rod, and the third rod are in an extended state, and the total length of the first rod, the second rod, and the third rod becomes longer.

[0016] When the switch is closed, the first, second, and third rods are kept in a compressed state; when the switch is open, the first, second, and third rods are extended, realizing the telescopic function.

[0017] The principle of this utility model is as follows:

[0018] The bending function in the left and right and forward and backward is achieved by the spring structure of the second rod. Since sound waves mainly exist in the form of longitudinal waves when they propagate in solid media (such as aluminum alloy or steel and other metal materials), and the vibration direction of the longitudinal waves is consistent with the propagation direction, the propagation path of the sound waves will change as the second rod bends in the bending structure.

[0019] When the length needs to be extended, the operator presses end a of the pressing bar to disengage the locking bar from the first through hole, and the second and third bars extend out, forming an extended state.

[0020] When compression is required, the operator presses end a of the pressing rod, and the operator uses their hand to press the second and third rods into the cavity of the first rod. Then, the operator releases end a of the pressing rod, the elastic element returns to its original length, end a of the pressing rod lifts up, and end b of the pressing rod descends, so that the clamping rod extends into the first through hole, the second through hole, and the third through hole. The first, second, and third rods form and maintain a compressed state.

[0021] When using this invention for inspection, the curvature and length of the invention are adjusted according to the width and depth of the internal space of the equipment. Then, the b-end of the third rod is used as the sound receiving end and brought close to the interior of the equipment to be inspected. The sound inside the equipment is transmitted to the sound output end through the third rod, the second rod, and the first rod. The tuning fork at the sound output end amplifies and strengthens the weak sound signal, making the sound clearer and louder. When the operator puts their ear close to the sound output end, they can clearly hear the sounds inside the equipment, such as the sound of bearings running and the sound of airflow in the pipes, thereby improving the convenience and accuracy of the inspection.

[0022] As a preferred technical solution:

[0023] As described above, a retractable and bendable inspection stylus includes a second stylus comprising a first base, a second spring, and a second base. The first base, the second spring, and the second base are all hollow cylindrical structures. One end of the first base is fixedly connected to one end of the second spring by welding or gluing, and the other end of the second spring is fixedly connected to one end of the second base by welding or gluing. This design allows the second stylus to bend and also facilitates the assembly or connection of the second stylus with the first stylus and the third stylus via the first base and the second base, respectively.

[0024] As described above, in a telescopic and bendable inspection stethoscope, the specific method of movable connection between end b of the second stylus and end a of the third stylus is as follows: the inner surface of end b of the second stylus is fixed with an annular inner protrusion by integral molding or welding, and the outer surface of end a of the third stylus is fixed with an annular outer protrusion by integral molding or welding. The inner diameter of the annular inner protrusion is not less than the outer diameter of the third stylus, and the inner diameter of the annular inner protrusion is less than the outer diameter of the annular outer protrusion. This design can achieve movable connection and is also convenient for assembly and disassembly.

[0025] As described above, the telescopic and bendable inspection rod has a three-section spring, consisting of a first section spring, a second section spring, and a third section spring, all of which are integrally formed.

[0026] The first spring passes through the first rod, the second spring passes through the second rod, and the third spring passes through the third rod;

[0027] The natural length of the first spring is greater than the length of the first rod to ensure that the first spring forms elastic force. The outer diameter of the first spring is not greater than the inner diameter of the first rod to ensure that the first spring can expand and contract within the cavity of the first rod.

[0028] The natural length of the second spring is greater than the length of the second rod to ensure that the second spring forms elastic force. The outer diameter of the second spring is not greater than the inner diameter of the second rod to ensure that the second spring can expand and contract within the cavity of the second rod.

[0029] The natural length of the third spring is greater than the length of the third rod to ensure that the third spring forms elastic force. The outer diameter of the third spring is not greater than the inner diameter of the third rod to ensure that the third spring can expand and contract within the cavity of the third rod.

[0030] This three-section spring design provides sufficient elastic force to allow the second and third rods to spring out from inside the first rod more quickly.

[0031] As described above, in a retractable and bendable inspection stylus, a sound-emitting ball is fixed to the opening at end a of the first stylus by welding and gluing. The sound-emitting ball is fitted onto the outside of the tuning fork, and a soundproof cover is fixed to the outer surface of the sound-emitting ball by Velcro. The sound-emitting ball is used to better transmit the sound from the tuning fork to the operator's ears, and the soundproof cover is used to reduce external noise interference, allowing the operator to focus more on the sound inside the equipment.

[0032] As described above, a telescopic and bendable inspection rod has a switching device comprising: a pressing rod, a hinge block, an elastic element, a locking rod, a first through hole, a second through hole, and a third through hole;

[0033] The first through hole is provided at the b end of the first rod and connects the surface of the b end of the first rod with the cavity;

[0034] The second through hole is located at end b of the second rod and penetrates the surface and cavity of end b of the second rod;

[0035] The third through hole is located at end b of the third rod and penetrates the surface and cavity of end b of the third rod;

[0036] The hinge block is fixed to the surface of end b of the first rod by welding and gluing, and the pressing rod is hinged to the hinge block for fixation;

[0037] The a end of the pressing rod is fixedly connected to the surface of the first rod body through an elastic element. For example, the bottom end of the elastic element is fixed to the surface of the first rod body by welding or gluing, and the top end of the elastic element is fixed to the a end of the pressing rod by welding or gluing. The b end of the pressing rod is fixedly connected to one end of the locking rod by welding or gluing, and the pressing rod is perpendicular to the locking rod.

[0038] When the first rod, the second rod, and the third rod are in a compressed state, the first through hole, the second through hole, and the third through hole are connected to form a channel for inserting the clamping rod. By selecting the first rod, the second rod, and the third rod of appropriate length, for example, the length of the first rod is greater than the length of the second rod, the length of the second rod is greater than the length of the third rod, and the distance between the center of the first through hole and the b end of the first rod, the distance between the center of the second through hole and the b end of the second rod, and the distance between the center of the third through hole and the b end of the third rod are the same, the first through hole, the second through hole, and the third through hole can be connected in the compressed state.

[0039] When end a of the pressing rod is released, the other end of the locking rod extends into the first through hole, the second through hole, and the third through hole. The first and second rods cannot extend out, maintaining the compressed state.

[0040] Pressing end A of the pressing rod causes the other end of the locking rod to disengage from the first through hole, the second through hole, and the third through hole. The first rod and the second rod extend out, forming an extended state. The elasticity and height of the elastic element can be selected to maintain the compressed state and form an extended state.

[0041] As described above, the retractable and bendable inspection rod has a third spring or a rubber block with elasticity as the elastic element. Using a spring or a rubber block can not only meet the elasticity requirement, but also facilitate fixing it between end a of the pressing rod and the surface of the first rod body.

[0042] As described above, in a telescopic and bendable inspection stethoscope, the outer surface of the first stethoscope body is wrapped with anti-slip cotton to increase the friction of the operator holding the inspection stethoscope, prevent slippage, and improve the stability of operation.

[0043] Beneficial effects:

[0044] (1) This utility model uses a sliding nesting assembly method of the first rod, the second rod and the third rod to make the length of the inspection listening rod adjustable as needed, realize the telescopic function, and adapt to inspection points of different heights and deep inside the equipment.

[0045] (2) By setting a spring structure in the second rod, this utility model can be bent and deformed to a certain extent to achieve the bending function, and can flexibly approach the equipment to be inspected, especially suitable for narrow and curved spaces and complex environments. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the present invention in the extended state (a and b represent end a and end b, respectively);

[0047] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A;

[0048] Figure 3 for Figure 1 A structural diagram after the soundproof cover has been removed;

[0049] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along BB;

[0050] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along CC;

[0051] Figure 6 This is a diagram showing the location of the tuning fork;

[0052] Figure 7 This is a schematic diagram of the third rod.

[0053] Figure 8 This is a schematic diagram of the second rod (the annular outer protrusion is not shown);

[0054] Figure 9 A schematic diagram of the combination of the second and third rods (the annular outer protrusion of the second rod is not shown);

[0055] Figure 10 A schematic diagram showing the connection relationship between the second and third rods;

[0056] Figure 11 This is a schematic diagram of the structure of the present invention in a compressed state;

[0057] In the diagram, 1. First rod body, 2. First rod body chamber, 3. Second rod body, 4. Second rod body chamber, 5. Third rod body, 6. Third through hole, 7. Sound ball, 8. Tuning fork, 9. First base, 10. Second base, 11. Second spring, 12. First spring, 13. Second through hole, 14. First through hole, 15. Hinge block, 16. Locking rod, 17. Pressing rod, 18. Velcro, 19. Soundproof cover, 20. Anti-slip cotton, 21. Third spring, 22. Annular outer protrusion, 23. Annular inner protrusion, 24. Third rod body chamber. Detailed Implementation

[0058] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0059] A retractable and bendable inspection stethoscope, such as Figures 1 to 11 As shown, it includes a first rod 1, a second rod 3, a third rod 5, and a first spring 12. The first rod 1, the second rod 3, and the third rod 5 are made of aluminum alloy.

[0060] The first rod 1, the second rod 3, and the third rod 5 are all hollow cylindrical structures; the interiors of the first rod 1, the second rod 3, and the third rod 5 are respectively the first rod chamber 2, the second rod chamber 4, and the third rod chamber 24;

[0061] The second rod 3 includes a first base 9, a second spring 11, and a second base 10. The first base 9, the second spring 11, and the second base 10 are all hollow cylindrical structures. One end of the first base 9 is fixedly connected to one end of the second spring 11 by welding, and the other end of the second spring 11 is fixedly connected to one end of the second base 10 by welding.

[0062] The inner diameter of the first rod 1 is equal to the outer diameter of the second rod 3, and the inner diameter of the second rod 3 is equal to the outer diameter of the third rod 5.

[0063] The first rod 1 is fitted over the second rod 3, and the second rod 3 is fitted over the third rod 5.

[0064] The inner surface of the b end of the second rod 3 is integrally formed with an annular inner protrusion 23, and the outer surface of the a end of the third rod 5 is integrally formed with an annular outer protrusion 22. The inner diameter of the annular inner protrusion 23 is equal to the outer diameter of the third rod 5, and the inner diameter of the annular inner protrusion 23 is smaller than the outer diameter of the annular outer protrusion 22. The b end of the second rod 3 and the a end of the third rod 5 are movably connected through the annular outer protrusion 22 and the annular inner protrusion 23.

[0065] The connection method between end b of the first rod 1 and end a of the second rod 3 is the same as the connection method between end b of the second rod 3 and end a of the third rod 5, so that the first rod 1, the second rod 3 and the third rod 5 are assembled together by sliding nesting.

[0066] Tuning forks 8 are arranged in a circular pattern at the outlet of end a of the first rod 1. The center of the circle is welded and fixed to the end face of end a of the first rod 1 by a connecting rod. A sound ball 7 is welded and fixed to the opening of end a of the first rod 1. The sound ball 7 is sleeved on the outside of the tuning fork 8. A soundproof cover 19 is fixed to the outer surface of the sound ball 7 by Velcro 18. Anti-slip cotton 20 is wrapped around the outer surface of the first rod 1.

[0067] One end of the first spring 12 is fixed to end a of the first rod 1 by welding, and the other end of the first spring 12 is fixed to end b of the third rod 5 by welding.

[0068] The first spring 12 is a three-section spring, consisting of a first section spring, a second section spring, and a third section spring, all of which are integrally formed.

[0069] The first spring penetrates the first rod cavity 2, the second spring penetrates the second rod cavity 4, and the third spring penetrates the third rod cavity 24.

[0070] The natural length of the first spring segment is greater than the length of the first rod 1, and the outer diameter of the first spring segment is equal to the inner diameter of the first rod 1.

[0071] The natural length of the second spring is greater than the length of the second rod 3, and the outer diameter of the second spring is equal to the inner diameter of the second rod 3.

[0072] The natural length of the third spring is greater than the length of the third rod 5, and the outer diameter of the third spring is equal to the inner diameter of the third rod 5.

[0073] It also includes: a pressing rod 17, a hinge block 15, a third spring 21, a locking rod 16, a first through hole 14, a second through hole 13 and a third through hole 6;

[0074] The first through hole 14 is provided at the b end of the first rod 1 and connects the surface of the b end of the first rod 1 and the cavity.

[0075] The second through hole 13 is provided at the b end of the second rod body 3 and penetrates the surface and cavity of the b end of the second rod body 3.

[0076] The third through hole 6 is located at the b end of the third rod 5 and penetrates the surface and cavity of the b end of the third rod 5.

[0077] The hinge block 15 is fixed to the surface of end b of the first rod 1 by welding, and the pressing rod 17 is hinged to the hinge block 15.

[0078] The bottom end of the third spring 21 is fixed to the surface of the first rod 1 by welding, and the top end of the third spring 21 is fixed to the a end of the pressing rod 17 by welding; the b end of the pressing rod 17 is fixedly connected to one end of the locking rod 16 by welding, and the pressing rod 17 is perpendicular to the locking rod 16.

[0079] The length of the first rod 1 is greater than that of the second rod 3, the length of the second rod 3 is greater than that of the third rod 5, and the distances between the center of the first through hole 14 and the b end of the first rod 1, the distance between the center of the second through hole 13 and the b end of the second rod 3, and the distance between the center of the third through hole 6 and the b end of the third rod 5 are the same. The first rod 1, the second rod 3 and the third rod 5 are compressed under the action of external force, and the first through hole 14, the second through hole 13 and the third through hole 6 are connected to form a channel for the insertion of the clamping rod 16.

[0080] When the first spring 12 is compressed, the first rod 1, the second rod 3 and the third rod 5 are in a compressed state, and the total length of the first rod 1, the second rod 3 and the third rod 5 becomes shorter; when the first spring 12 is extended, the first rod 1, the second rod 3 and the third rod 5 are in an extended state, and the total length of the first rod 1, the second rod 3 and the third rod 5 becomes longer.

[0081] When the a end of the pressing rod 17 is released, the third spring 21 becomes longer as it returns to its natural length. The a end of the pressing rod 17 rises, while the b end of the pressing rod 17 falls, causing the other end of the locking rod 16 to extend into the first through hole 14, the second through hole 13 and the third through hole 6. The first rod body 1 and the second rod body 3 cannot extend out and remain in a compressed state.

[0082] Pressing end a of the pressing rod 17 causes the third spring 21 to shorten during compression, causing end a of the pressing rod 17 to descend while end b of the pressing rod 17 rises. The other end of the locking rod 16 disengages from the first through hole 14, the second through hole 13, and the third through hole 6, and the first rod body 1 and the second rod body 3 extend out, forming an extended state.

[0083] The operation process of this utility model is as follows:

[0084] When using this invention for inspection, the curvature and length of the invention are adjusted according to the width and depth of the internal space of the equipment. Then, the b-end of the third rod is used as the sound receiving end and brought close to the interior of the equipment to be inspected. The sound inside the equipment is transmitted to the sound output end through the third rod, the second rod, and the first rod. The tuning fork at the sound output end amplifies and strengthens the weak sound signal, making the sound clearer and louder. When the operator puts their ear close to the sound output end, they can clearly hear the sounds inside the equipment, such as the sound of bearings running and the sound of airflow in the pipes, thereby improving the convenience and accuracy of the inspection.

[0085] The application scenarios of this utility model are as follows:

[0086] Suitable for inspection scenarios of various industrial equipment, such as:

[0087] Inspection in confined spaces: In confined spaces such as pipes and valves, by adjusting the length and bending angle of the inspection stethoscope, the receiver can be easily placed against the surface of the equipment for sound detection;

[0088] Inspection of equipment at height: For equipment installed at height, operators can extend and bend the inspection stethoscope to reach the equipment inspection point without having to climb the equipment, thus improving work efficiency and safety;

[0089] Inspection in complex environments: In machine rooms or workshops with dense equipment and limited space, the telescopic and bending functions of the inspection stethoscope allow it to flexibly adapt to various complex environments, making it convenient for operators to conduct equipment inspections.

[0090] Through the detailed description of the above embodiments, the retractable and bendable inspection stethoscope of this utility model has significant advantages in structural design and functional implementation. It can effectively solve the problems of inconvenient operation and poor applicability of existing stethoscopes, and improve the flexibility and convenience of industrial equipment inspection.

Claims

1. A retractable and bendable inspection stethoscope, characterized in that, It includes a first rod, a second rod, a third rod, and a first spring; The first, second, and third rods are all hollow cylindrical structures; the interiors of the first, second, and third rods are respectively the first rod cavity, the second rod cavity, and the third rod cavity; the middle section of the second rod adopts a spring structure; The inner diameter of the first rod is not less than the outer diameter of the second rod, and the inner diameter of the second rod is not less than the outer diameter of the third rod; The first rod is fitted over the second rod, and the second rod is fitted over the third rod. The b end of the second rod is movably connected to the a end of the third rod. The connection method between the b end of the first rod and the a end of the second rod is the same as the connection method between the b end of the second rod and the a end of the third rod. The first spring passes through the first rod chamber, the second rod chamber, and the third rod chamber. One end of the first spring is fixed to end a of the first rod, and the other end of the first spring is fixed to end b of the third rod. A tuning fork is also fixed at the outlet of end a of the first rod; Switching devices are provided at the b end of the first rod, the b end of the second rod, and the b end of the third rod. When the first spring is compressed, the first rod, the second rod, and the third rod are in a compressed state; when the first spring is extended, the first rod, the second rod, and the third rod are in an extended state. When the switching device is closed, the first, second, and third rods are kept in a compressed state; when the switching device is open, the first, second, and third rods are in an extended state.

2. The retractable and bendable inspection stethoscope according to claim 1, characterized in that, The second rod includes a first base, a second spring, and a second base. The first base, the second spring, and the second base are all hollow cylindrical structures. One end of the first base is fixedly connected to one end of the second spring, and the other end of the second spring is fixedly connected to one end of the second base.

3. The telescopic and bendable inspection stethoscope according to claim 1, characterized in that, The specific way the b end of the second rod and the a end of the third rod are connected is as follows: an annular inner protrusion is fixed on the inner surface of the b end of the second rod, and an annular outer protrusion is fixed on the outer surface of the a end of the third rod. The inner diameter of the annular inner protrusion is not less than the outer diameter of the third rod, and the inner diameter of the annular inner protrusion is less than the outer diameter of the annular outer protrusion.

4. The retractable and bendable inspection stethoscope according to claim 1, characterized in that, The first spring is a three-section spring, consisting of a first section spring, a second section spring, and a third section spring, all of which are integrally formed. The first spring passes through the first rod, the second spring passes through the second rod, and the third spring passes through the third rod; The natural length of the first spring segment is greater than the length of the first rod, and the outer diameter of the first spring segment is not greater than the inner diameter of the first rod. The natural length of the second spring is greater than the length of the second rod, and the outer diameter of the second spring is not greater than the inner diameter of the second rod. The natural length of the third spring is greater than the length of the third rod, and the outer diameter of the third spring is not greater than the inner diameter of the third rod.

5. A retractable and bendable inspection stethoscope according to claim 1, characterized in that, A sound-emitting ball is fixed at the opening of end a of the first rod. The sound-emitting ball is fitted on the outside of the tuning fork, and a soundproof cover is fixed to the outer surface of the sound-emitting ball with Velcro.

6. A retractable and bendable inspection stethoscope according to claim 1, characterized in that, The switching device includes: a pressing rod, a hinge block, an elastic element, a locking rod, a first through hole, a second through hole, and a third through hole; The first through hole is provided at the b end of the first rod and connects the surface of the b end of the first rod with the cavity; The second through hole is located at end b of the second rod and penetrates the surface and cavity of end b of the second rod; The third through hole is located at end b of the third rod and penetrates the surface and cavity of end b of the third rod; The hinge block is fixed to the surface of end b of the first rod, and the pressing rod is hinged and fixed to the hinge block; The a end of the pressing rod is fixedly connected to the surface of the first rod body through an elastic element; the b end of the pressing rod is fixedly connected to one end of the clamping rod, and the pressing rod is perpendicular to the clamping rod. When the first rod, the second rod, and the third rod are in a compressed state, the first through hole, the second through hole, and the third through hole are connected to form a channel for inserting the clamping rod. Release end a of the pressing bar, and the other end of the locking bar will extend into the first through hole, the second through hole, and the third through hole to maintain the compressed state; Pressing end A of the pressing rod causes the other end of the rod to disengage from the first through hole, the second through hole, and the third through hole, forming an extended state.

7. A retractable and bendable inspection stethoscope according to claim 6, characterized in that, The elastic element is a third spring or a rubber block with elasticity.

8. A retractable and bendable inspection stethoscope according to claim 1, characterized in that, The outer surface of the first rod is wrapped with anti-slip cotton.

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