A hair cutting device with a conveniently replaceable cutting head assembly

Abstract

This utility model relates to the field of hair cutting technology, and specifically discloses a hair cutting device with a convenient replaceable blade assembly, including a blade assembly and a handle assembly. The blade assembly includes a first housing, and the handle assembly includes an inner housing. A first elastic element is connected to the inner housing, and the first elastic element is hollow. At least a portion of the neck of the first housing is inserted into the hollow portion of the first elastic element. A mounting groove is provided circumferentially on the outer side wall of the first elastic element, and a second elastic element is sleeved in the mounting groove. The elastic force of the second elastic element causes the first elastic element to deform and clamp the neck of the first housing. Through the cooperation of the first and second elastic elements, the first elastic element can effectively clamp the neck of the first housing. Therefore, when processing the first elastic element, there is no need to strictly control the processing accuracy of the first elastic element, making it easy to process, with high processing efficiency, low product scrap rate, and low production cost.

Description

Technical Field

[0001] This utility model relates to the field of hair cutting technology, and in particular to a hair cutting device that facilitates the replacement of the blade assembly. Background Technology

[0002] A hair cutting device is a product used to cut and trim hair (such as head hair, beard, and other body hair). Existing hair cutting devices include a blade assembly, a drive assembly, and a handle assembly. The drive assembly is located inside the handle assembly, and the housing of the blade assembly is connected to the handle assembly. The moving blade inside the blade assembly is driven by the drive assembly to move and cooperate with the stationary blade to trim the hair. However, currently, the blade assembly and handle assembly of hair cutting devices are not detachably connected. Therefore, when the blade assembly is worn out and cannot cleanly trim hair, or when the blade assembly is damaged and cannot cut hair, or when the drive assembly inside the handle assembly malfunctions, users need to send the entire hair cutting device to the manufacturer or after-sales service center for maintenance and component replacement. This results in users being unable to use the hair cutting device during maintenance, and some users simply replace it with a new one, increasing their operating costs.

[0003] To address the above issues, the industry has provided a hair cutting device that allows for detachable connection between the blade head assembly and the handle assembly. See Chinese Patent CN205255046U for an intelligent shaver with a disposable blade head assembly. This shaver features a blade head insertion hole at the upper part of the handle, a blade head connection part at the lower end of the blade head assembly that connects to the handle, a clamping spring in the blade head insertion hole, and a groove on the blade head connection part that mates with the clamping spring. The detachable connection between the blade head assembly and the handle is achieved through the engagement of the clamping spring and the groove. However, achieving a flexible pluggable connection through the engagement of the clamping spring and the groove requires precise control over the machining error of the clamping spring during processing. If the engagement between the clamping spring and the groove is too tight, it will make inserting and removing the razor head assembly difficult and inconvenient to use. If the engagement between the clamping spring and the groove is too loose, it will not be conducive to the razor head assembly being securely connected to the handle, which will also make it difficult for users to use the hair cutting device to trim body hair. It can be seen that the detachable structure of the razor in this patent requires high machining precision, which is not conducive to improving machining efficiency and is prone to component scrapping due to insufficient machining precision, thus increasing production costs. Utility Model Content

[0004] The present invention aims to solve the technical problems existing in the prior art and provide a hair cutting device with easy processing, high processing efficiency and low processing cost, and convenient replacement of the blade assembly.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a hair cutting device with a convenient replaceable blade assembly, comprising a blade assembly and a handle assembly. The blade assembly includes a first housing, and the handle assembly includes an inner housing and an outer housing, with the outer housing surrounding the inner housing. A first elastic element is connected to the inner housing, and the first elastic element is hollow. At least a portion of the neck of the first housing is inserted into the hollow portion of the first elastic element. A mounting groove is provided circumferentially on the outer side wall of the first elastic element, and a second elastic element is sleeved in the mounting groove. The elastic force of the second elastic element causes the first elastic element to deform and clamp the neck of the first housing.

[0007] Alternatively, at least a portion of the neck of the first housing is inserted into the hollow portion of the first elastic member. When the neck of the first housing is inserted into the hollow portion of the first elastic member, the first elastic member is deformed by force and clamps the neck of the first housing after elastic recovery. A mounting groove is provided in the circumferential direction on the outer side wall of the first elastic member, and a second elastic member is sleeved in the mounting groove. The elastic force of the second elastic member causes the first elastic member to clamp the neck of the first housing.

[0008] The hair cutting device of this utility model, which facilitates the replacement of the blade assembly, can effectively clamp the neck of the first housing by cooperating with the first elastic element and the second elastic element. Therefore, when processing the first elastic element, there is no need to strictly control the processing accuracy of the first elastic element, making it easy to process and highly efficient. Due to the convenience of processing, the scrap rate of parts due to unqualified processing is greatly reduced, thereby reducing production costs.

[0009] Furthermore, a connecting groove is provided circumferentially on the outer side wall of the neck of the first housing, and a connecting protrusion is provided circumferentially on the inner wall of the first elastic member. When the first elastic member clamps the neck of the first housing, the connecting protrusion is inserted into the connecting groove and abuts against the connecting groove.

[0010] Furthermore, the mounting groove on the first elastic member is located on the side away from the inner housing, and the mounting groove on the first elastic member is arranged opposite to the connecting protrusion.

[0011] Furthermore, the first elastic member includes a seat body connected to the inner housing, on which a first clamping portion and a second clamping portion are provided. The first clamping portion and the second clamping portion are spaced apart and disposed opposite to each other. The first clamping portion and the second clamping portion form a clamp for clamping the neck of the first housing. Grooves are respectively provided on the outer side wall of the first clamping portion and the outer side wall of the second clamping portion. The groove on the first clamping portion and the groove on the second clamping portion form the mounting groove.

[0012] Furthermore, it also includes a top cover bracket, which is connected to the inner housing, and the first elastic element is disposed between the top cover bracket and the inner housing; the top cover bracket is provided with a through hole for the neck of the first housing to be inserted, the through hole being coaxial with the hollow portion of the first elastic element; and the top cover bracket is used to close the opening of the outer housing.

[0013] Furthermore, a first stepped surface is provided on the neck sidewall of the first housing, and a second stepped surface is provided on the top surface of the top cover bracket. When the cutter head assembly is assembled in place, the first stepped surface contacts the second stepped surface.

[0014] Furthermore, the bottom surface of the top cover bracket is provided with multiple connecting posts at intervals, and the inner shell is provided with multiple connecting ears. The connecting posts and the connecting ears correspond one-to-one, and the corresponding connecting ears and connecting posts are connected together by fasteners. The multiple connecting posts, the bottom surface of the top cover bracket and the top surface of the inner shell form an installation space for installing the first elastic element.

[0015] Furthermore, one or two first positioning members are provided on the bottom surface of the top cover bracket. The first elastic member includes a first clamping part and a second clamping part. The first clamping part and the second clamping part are spaced apart and arranged opposite to each other. The first positioning member is inserted into the corresponding space between the first clamping part and the second clamping part.

[0016] Furthermore, a first positioning groove is provided on the neck sidewall of the first housing, the first positioning groove being opposite to one of the gaps formed by the first clamping part and the second clamping part, and for a portion of the corresponding first positioning member to be inserted.

[0017] Furthermore, a second positioning groove is provided on the inner wall of the seat of the first elastic member, and a second positioning member is provided on the top surface of the inner shell. When the first elastic member is assembled in place, a portion of the second positioning member is located in the second positioning groove. Attached Figure Description

[0018] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0019] Figure 1 This is a perspective view of the hair cutting device in this utility model.

[0020] Figure 2 for Figure 1 A schematic diagram of its breakdown.

[0021] Figure 3 This is a cross-sectional view of the hair cutting device of this utility model.

[0022] Figure 4 This is a schematic diagram of the first shell structure.

[0023] Figure 5 This is a schematic diagram of the top cover support structure.

[0024] Figure 6 This is a schematic diagram of the assembly state of the first elastic element and the second elastic element.

[0025] The components include: a first housing 1; a neck 101; a connecting groove 102; a first stepped surface 103; a first positioning groove 104; an inner housing 2; a hollow portion 3; a second elastic element 4; a connecting protrusion 5; a seat 6; a first clamping part 7; a second clamping part 8; a groove 9; a top cover bracket 10; a through hole 11; a second stepped surface 12; an annular groove 13; a connecting post 14; a connecting ear 15; a fastener 16; a first positioning element 17; a spacer 18; a second positioning groove 19; and a second positioning element 20. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0027] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Example 1

[0030] This embodiment provides a hair cutting device with a conveniently replaceable blade assembly; see [link to previous section]. Figure 1-6 It includes a blade assembly and a handle assembly (of this utility model). Figure 1 and Figure 2The diagram only shows the shell and the connection structure between the shells, omitting other components or structures of the hair cutting device (which are existing technologies). The cutter head assembly includes a first shell 1, in which the moving blade, fixed blade, and other transmission structures are all housed. The handle assembly includes an inner shell 2, in which the drive mechanism is housed. The drive mechanism is connected to the transmission structure in the cutter head assembly via its output shaft to drive the moving blade in the cutter head assembly to reciprocate relative to the fixed blade, thereby cutting the hair. A first elastic element is connected to the inner shell 2. The first elastic element can be made of plastic and is hollow. At least a portion of the neck 101 of the first shell 1 is inserted into the hollow portion 3 of the first elastic element. A mounting groove is provided circumferentially on the outer side wall of the first elastic element. A second elastic element 4 is fitted inside the mounting groove. The elastic force of the second elastic element 4 causes the first elastic element to deform and clamp the neck 101 of the first shell 1. This can be understood as follows: when the second elastic element 4 is not fitted, and the first elastic element is assembled with the neck 101 of the first housing 1, the first elastic element is not subjected to the squeezing force of the neck 101 of the first housing 1. At this time, it is convenient for the neck 101 of the first housing 1 to be inserted into the hollow part 3 of the first elastic element. Then, the second elastic element 4 is fitted onto the first elastic element, causing the first elastic element to deform and clamp onto the outer surface of the neck 101 of the first housing 1. The second elastic element 4 can be made of elastic materials such as rubber rings or silicone rings. Since the second elastic element 4 is just an elastic ring, the processing is very simple. The adjustment of its elastic force can be controlled by adjusting the softness or hardness of the elastic ring or the ring diameter. The adjustment of the elastic force of the elastic ring is a conventional control method in this field. This avoids difficulties in inserting and removing the cutter head assembly or unstable connection with the handle assembly, thereby avoiding high-precision processing of the first elastic element, greatly improving processing efficiency, and reducing the scrap rate of parts due to unqualified processing, thereby reducing production costs. As can be seen, the hair cutting device in this embodiment, through the cooperation of the first elastic element and the second elastic element 4, can effectively clamp the neck 101 of the first housing 1 with the first elastic element. Therefore, when processing the first elastic element, there is no need to strictly control the processing accuracy of the first elastic element, making it easy to process and with high processing efficiency. Due to the convenience of processing, the scrap rate of parts due to unqualified processing is greatly reduced, thereby reducing production costs.

[0031] In the preferred embodiment, see Figure 2A connecting groove 102 is provided circumferentially on the outer wall of the neck 101 of the first housing 1, and a connecting protrusion 5 is provided circumferentially on the inner wall of the first elastic member. When the first elastic member clamps the neck 101 of the first housing 1, the connecting protrusion 5 is inserted into the connecting groove 102 and abuts against the connecting groove 102, thereby clamping the neck 101 of the first housing 1 by the first elastic member. The first elastic member includes a seat 6 connected to the inner housing 2. A first clamping part 7 and a second clamping part 8 are provided on the seat 6. The first clamping part 7 and the second clamping part 8 are spaced apart and arranged opposite to each other, forming a chuck for clamping the neck 101 of the first housing 1. A groove 9 is provided on the outer wall of the first clamping part 7 and the outer wall of the second clamping part 8, respectively. The groove 9 on the first clamping part 7 and the groove 9 on the second clamping part 8 form the aforementioned mounting groove. Since the first elastic element is made of a material with a certain elasticity, such as plastic, when the second elastic element 4 is sleeved on the clamp formed by the first clamping part 7 and the second clamping part 8, it will cause the first clamping part 7 and the second clamping part 8 to swing towards each other under the force and deform, and at this time the neck 101 of the first housing 1 will be clamped.

[0032] In the preferred embodiment, see Figure 2 and 3 The mounting groove on the first elastic member is located on the side away from the inner housing 2, and the mounting groove on the first elastic member is arranged opposite to the connecting protrusion 5. Specifically, in this embodiment, the mounting groove is located on the side of the clamp away from the seat 6. At this time, the second elastic member 4 can use a small elastic force to cause the first clamping part 7 and the second clamping part 8 to swing. At the same time, the mounting groove and the connecting protrusion 5 are arranged opposite to each other, which can ensure that when the first clamping part 7 and the second clamping part 8 swing towards each other, the connecting protrusion 5 can be effectively inserted into the connecting groove 102 and effectively clamped. In this embodiment, there is a gap between the connecting protrusion 5 on the first elastic member and the part of the neck 101 of the first housing 1 that is inserted into the first elastic member, thereby ensuring that when the second elastic member 4 is not fitted, the first elastic member is not subjected to the squeezing force of the neck 101 of the first housing 1 when it is assembled with the neck 101 of the first housing 1.

[0033] In the preferred embodiment, see Figure 1-3The hair cutting device of this embodiment also includes a top cover bracket 10, which is connected to the inner housing 2, and a first elastic member is disposed between the top cover bracket 10 and the inner housing 2. A through hole 11 is provided on the top cover bracket 10 for the neck 101 of the first housing 1 to be inserted, and the through hole 11 is coaxial with the hollow portion 3 of the first elastic member. In fact, the handle assembly also includes an outer shell, which surrounds the outer shell. By providing the top cover bracket 10, the port of the outer shell can be closed, and the inner housing and the components installed on the inner housing are surrounded in the inner cavity of the outer shell, making the hair cutting device more aesthetically pleasing. At the same time, by providing the through hole 11 on the top cover bracket 10, and the through hole 11 being coaxial with the hollow portion 3 of the first elastic member, a guiding function is provided, which can guide the neck 101 of the first housing 1 of the blade assembly to be smoothly inserted into the hollow portion 3 of the first elastic member.

[0034] In the preferred embodiment, see Figure 3 A first stepped surface 103 is provided on the side wall of the neck 101 of the first housing 1, and a second stepped surface 12 is provided on the top surface of the top cover bracket 10. When the cutter head assembly is assembled, the first stepped surface 103 contacts the second stepped surface 12. The cooperation between the first stepped surface 103 and the second stepped surface 12 can limit the insertion depth of the neck 101 of the cutter head assembly, preventing damage to the components when the user forcefully inserts or removes them. In addition, an annular groove 13 is provided on the top surface of the top cover bracket 10, and the bottom surface of the annular groove 13 is the second stepped surface 12. By making the first stepped surface 103 on the neck 101 of the first housing 1 contact the bottom of the annular groove 13, the first stepped surface 103 at the neck 101 of the first housing 1 is prevented from being exposed to the outside, resulting in a more aesthetically pleasing appearance.

[0035] In the preferred embodiment, see Figure 1-6 The bottom surface of the top cover bracket 10 is provided with multiple connecting posts 14 at intervals, and the inner shell 2 is provided with multiple connecting ears 15. The connecting posts 14 and the connecting ears 15 correspond one-to-one, and the corresponding connecting ears 15 and the connecting posts 14 are connected as a whole by fasteners 16. The fasteners 16 can be threaded connectors or pins, etc. The multiple connecting posts 14, the bottom surface of the top cover bracket 10 and the top surface of the inner shell 2 form an installation space for installing the first elastic element. With this structure, when the outer shell is covered later, the first connecting element can also be enclosed in the outer shell, which not only makes the product structure compact, but also makes it aesthetically pleasing.

[0036] In a preferred embodiment, one or two first positioning members 17 are provided on the bottom surface of the top cover bracket 10. The first elastic member includes a first clamping part 7 and a second clamping part 8, which are spaced apart and opposite to each other. The first positioning member 17 is inserted into the corresponding space 18 formed by the first clamping part 7 and the second clamping part 8. For details, see [link to relevant documentation]. Figure 1-6In this embodiment, two first positioning members 17 are provided on the bottom surface of the top cover bracket 10. The two first positioning members 17 are spaced apart or symmetrically arranged. Since the first elastic member includes a first clamping part 7 and a second clamping part 8 that are spaced apart and arranged opposite to each other, the two ends of the first clamping part 7 and the two ends of the second clamping part 8 are spaced apart to form a gap space 18. The two first positioning members 17 correspond one-to-one with the two gap spaces 18. Through the cooperation of the first positioning members 17 and the gap spaces 18, the top cover bracket 10 and the first elastic member can be quickly assembled.

[0037] In the preferred embodiment, see Figure 2 A first positioning groove 104 is provided on the side wall of the neck 101 of the first housing 1. The first positioning groove 104 is opposite to one of the gap spaces 18 formed by the first clamping part 7 and the second clamping part 8, and allows a part of the corresponding first positioning member 17 to be inserted. Specifically, in this embodiment, the two ends of the first clamping part 7 are spaced apart from the corresponding two ends of the second clamping part 8, forming a gap space 18, that is, there are two gap spaces 18. At this time, the first positioning groove 104 only needs to correspond to one of the gap spaces 18, and the two first positioning members 17 have different sizes, with one first positioning member 17 being larger than the other. When the neck 101 of the cutter head assembly is inserted into the through hole 11 of the top cover bracket 10 and enters the hollow part 3 of the first elastic member, a part of the larger first positioning member 17 is inserted into the first positioning groove 104 on the side wall of the neck 101 of the first housing 1. However, when the cutter head assembly is not inserted in the correct direction, it cannot be assembled in place due to the restriction of the larger first positioning member 17, thus reminding the user that the cutter head assembly is not installed correctly. It can be seen that the cooperation between the first positioning groove 104 and the larger first positioning member 17 can play a foolproof role, ensuring that the cutter head assembly is quickly and in one go.

[0038] In the preferred embodiment, see Figure 2 A second positioning groove 19 is provided on the inner wall of the seat 6 of the first elastic member, and a second positioning member 20 is provided on the top surface of the inner shell 2. When the first elastic member is assembled in place, a portion of the second positioning member 20 is located in the second positioning groove 19. Specifically, there are two second positioning grooves 19 in this embodiment, which are spaced apart or, more specifically, arranged opposite to each other. Correspondingly, there are also two second positioning members 20, which correspond one-to-one with the two second positioning grooves 19. Through the cooperation of the second positioning grooves 19 and the second positioning members 20, the first elastic member can be quickly assembled in place.

[0039] Example 2

[0040] This utility model also provides another embodiment of a hair cutting device with a convenient replaceable blade assembly, including a blade assembly and a handle assembly. The blade assembly includes a first housing 1, and the handle assembly includes an inner housing 2. A first elastic element is connected to the inner housing 2. The first elastic element is hollow. At least a portion of the neck 101 of the first housing 1 is inserted into the hollow portion 3 of the first elastic element. When the neck 101 of the first housing 1 is inserted into the hollow portion 3 of the first elastic element, the first elastic element deforms under force and clamps the neck 101 of the first housing 1 after elastic recovery. A mounting groove is provided in the circumferential direction on the outer side wall of the first elastic element. A second elastic element 4 is sleeved in the mounting groove. The elastic force of the second elastic element 4 causes the first elastic element to clamp the neck 101 of the first housing 1. The difference between this embodiment and Embodiment 1 is that, without the second elastic element 4, when the neck 101 of the first housing 1 is inserted into the first elastic element, it will exert a compressive force on the first elastic element. However, in order to facilitate the smooth insertion of the neck 101 of the first housing 1 into the first elastic element and to facilitate the processing of the first elastic element, the fit between the two can be controlled to a minimum interference fit or an interference fit in the transition fit, so as to minimize the interference between the two, facilitate the easy insertion of the neck 101 of the first housing 1, and facilitate the processing of the first elastic element. At this time, it is only necessary for the first elastic element to have a clamping feeling on the neck 101 of the first housing 1, and it is not required that the first elastic element completely clamp the neck 101 of the first housing 1. Therefore, the processing accuracy of the first elastic element is not required to be very high, reducing the... The processing difficulty of the first elastic element is reduced. Then, the second elastic element 4 is fitted onto the first elastic element, causing the first elastic element to further clamp onto the outer surface of the neck 101 of the first housing 1. The second elastic element 4 can be made of elastic materials such as rubber or silicone rings. Since the second elastic element 4 is only an elastic ring, its processing is very simple. Adjusting its elastic force only requires adjusting the hardness or diameter of the elastic ring. Adjusting the elastic force of the elastic ring is a conventional control method in this field. This avoids difficulties in inserting and removing the cutter head assembly or unstable connection with the handle assembly, thereby avoiding high-precision processing of the first elastic element, significantly improving processing efficiency, and reducing the scrap rate of parts due to processing defects, thus reducing production costs. Through the cooperation of the first and second elastic elements 4, the first elastic element can effectively clamp the neck 101 of the first housing 1. Therefore, when processing the first elastic element, there is no need to strictly control its processing precision, making it easy to process and highly efficient. Due to the ease of processing, the scrap rate of parts due to processing defects is significantly reduced, thereby reducing production costs.

[0041] The remaining structures in this embodiment are at least the same as those in Embodiment 1.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hair cutting device with a conveniently replaceable blade assembly, comprising a blade assembly and a handle assembly, wherein the blade assembly includes a first housing, and the handle assembly includes an inner housing and an outer housing, the outer housing surrounding the inner housing; characterized in that: A first elastic element is connected to the inner shell, and the first elastic element is hollow. At least a portion of the neck of the first shell is inserted into the hollow portion of the first elastic element. A mounting groove is provided on the circumferential direction of the outer side wall of the first elastic element. A second elastic element is sleeved in the mounting groove. The elastic force of the second elastic element causes the first elastic element to deform and clamp the neck of the first shell. Alternatively, at least a portion of the neck of the first housing is inserted into the hollow portion of the first elastic member. When the neck of the first housing is inserted into the hollow portion of the first elastic member, the first elastic member is deformed by force and clamps the neck of the first housing after elastic recovery. A mounting groove is provided in the circumferential direction on the outer side wall of the first elastic member, and a second elastic member is sleeved in the mounting groove. The elastic force of the second elastic member causes the first elastic member to clamp the neck of the first housing.

2. The hair cutting device with a conveniently replaceable blade assembly according to claim 1, characterized in that: A connecting groove is provided on the circumferential side of the neck of the first housing, and a connecting protrusion is provided on the circumferential side of the inner wall of the first elastic member. When the first elastic member clamps the neck of the first housing, the connecting protrusion is inserted into the connecting groove and abuts against the connecting groove.

3. The hair cutting device with a conveniently replaceable blade assembly according to claim 2, characterized in that: The mounting groove on the first elastic member is located on the side away from the inner housing, and the mounting groove on the first elastic member is arranged opposite to the connecting protrusion.

4. The hair cutting device with a conveniently replaceable blade assembly according to claim 1, characterized in that: The first elastic member includes a seat body connected to the inner housing. A first clamping portion and a second clamping portion are provided on the seat body. The first clamping portion and the second clamping portion are spaced apart and arranged opposite to each other. The first clamping portion and the second clamping portion form a clamp for clamping the neck of the first housing. Grooves are respectively provided on the outer side wall of the first clamping portion and the outer side wall of the second clamping portion. The groove on the first clamping portion and the groove on the second clamping portion form the mounting groove.

5. The hair cutting device with a conveniently replaceable blade assembly according to claim 1, characterized in that: It also includes a top cover bracket, which is connected to the inner housing, and the first elastic element is disposed between the top cover bracket and the inner housing; the top cover bracket is provided with a through hole for the neck of the first housing to be inserted, the through hole being coaxial with the hollow portion of the first elastic element; and the top cover bracket is used to close the opening of the outer housing.

6. The hair cutting device with a conveniently replaceable blade assembly according to claim 5, characterized in that: A first stepped surface is provided on the neck sidewall of the first housing, and a second stepped surface is provided on the top surface of the top cover bracket. When the cutter head assembly is assembled in place, the first stepped surface contacts the second stepped surface.

7. The hair cutting device with a conveniently replaceable blade assembly according to claim 5, characterized in that: The bottom surface of the top cover bracket is provided with multiple connecting posts at intervals, and the inner shell is provided with multiple connecting ears. The connecting posts and the connecting ears correspond one-to-one, and the corresponding connecting ears and connecting posts are connected as one unit by fasteners. The multiple connecting posts, the bottom surface of the top cover bracket and the top surface of the inner shell form an installation space for installing the first elastic element.

8. The hair cutting device with a conveniently replaceable blade assembly according to claim 5, characterized in that: One or two first positioning members are provided on the bottom surface of the top cover bracket. The first elastic member includes a first clamping part and a second clamping part. The first clamping part and the second clamping part are spaced apart and arranged opposite to each other. The first positioning member is inserted into the corresponding space formed by the first clamping part and the second clamping part.

9. The hair cutting device with a conveniently replaceable blade assembly according to claim 8, characterized in that: A first positioning groove is provided on the neck sidewall of the first housing. The first positioning groove is opposite to one of the gap spaces formed by the first clamping part and the second clamping part, and allows a portion of the corresponding first positioning member to be inserted.

10. The hair cutting device with a conveniently replaceable blade assembly according to claim 4, characterized in that: A second positioning groove is provided on the inner wall of the seat of the first elastic member, and a second positioning member is provided on the top surface of the inner shell. When the first elastic member is assembled in place, part of the second positioning member is located in the second positioning groove.

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