Donning and doffing mechanism for waist-entry positive pressure airtight suit and waist-entry positive pressure airtight suit

Abstract

The present invention discloses a donning and doffing mechanism for a waist-in type positive pressure airtight suit and a waist-in type positive pressure airtight suit. The waist-in type positive pressure airtight suit includes an upper garment and lower trousers. The donning and doffing mechanism includes: an upper flange, which is connected to the lower edge of the upper garment, and a guiding hole is provided on the upper flange; a lower flange, which is connected to the upper edge of the lower trousers, and an installation hole corresponding to the guiding hole is provided on the lower flange; a locking bolt assembly, which is arranged in the installation hole, the locking bolt assembly can extend into the guiding hole, and the locking bolt assembly can rotate between an unlocking position and a locking position. According to the donning and doffing mechanism of the waist-in type positive pressure airtight suit in the embodiment of the present invention, by switching the rotation of the locking bolt assembly between the unlocking position and the locking position, the connection and disconnection of the upper flange and the lower flange can be quickly realized, saving time, and at the same time, the operation is simple, the manufacturing cost is low, and the matching of upper and lower garments of different sizes can be realized according to the anisotropy of the user's body shape.

Description

Technical Field

[0001] The present invention relates to the technical field of quick connection and sealing, and in particular to a donning and doffing mechanism for a waist-in type positive pressure airtight suit and a waist-in type positive pressure airtight suit. Background Art

[0002] In related technologies, the donning and doffing method of positive pressure airtight suits is mainly a soft zipper type with the upper and lower garments being integrated. However, this donning and doffing method does not conform to daily habits, takes a long time for donning and doffing, and the sealing zipper accounts for a relatively high proportion of the overall cost of the garment. Other possible methods include waist-in type, back-in type, neck-in type and other disconnection type donning and doffing methods. The disadvantages of the disconnection type donning and doffing method are that the locking mechanism is complex, generally requiring a linkage mechanism to achieve locking, resulting in an increase in weight and cumbersome operation. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a donning and doffing mechanism for a waist-in type positive pressure airtight suit. The donning and doffing mechanism of the waist-in type positive pressure airtight suit can achieve quick connection and disconnection through the installation of an upper flange on the upper garment and a lower flange on the lower trousers. The upper flange and the lower flange can be quickly connected and disconnected through a locking bolt assembly, thereby enabling the waist-in type positive pressure airtight suit to be donned and doffed quickly, saving time, having simple operation, good sealing effect, and low manufacturing cost at the same time.

[0004] Another object of the present invention is to provide a waist-in type positive pressure airtight suit.

[0005] According to an embodiment of the first aspect of the present invention, a donning and doffing mechanism for a waist-in type positive pressure airtight suit, the waist-in type positive pressure airtight suit includes an upper garment and a lower trouser, and the donning and doffing mechanism includes: an upper flange, the upper flange is connected to the lower edge of the upper garment, and a guiding hole is provided on the upper flange; a lower flange, the lower flange is connected to the upper edge of the lower trouser, wherein an installation hole corresponding to the guiding hole is provided on the lower flange; a locking bolt assembly, the locking bolt assembly is disposed in the installation hole, the locking bolt assembly can extend into the guiding hole, and the locking bolt assembly can rotate between an unlocking position and a locking position, wherein when the locking bolt assembly is located at the unlocking position, the upper flange and the lower flange can be disengaged from each other, and when the locking bolt assembly is located at the locking position, the upper flange and the lower flange are connected to each other.

[0006] The donning and doffing mechanism of the waist-in type positive pressure airtight suit according to the embodiments of the present invention. Due to the donning and doffing mechanism of the waist-in type positive pressure airtight suit in the embodiments of the present invention, by rotating the locking bolt assembly to switch between the unlocking position and the locking position, the connection and disconnection of the upper flange and the lower flange can be quickly realized. At the same time, through the cooperation of the locking bolt assembly with the upper flange and the lower flange, the quick donning and doffing of the waist-in type positive pressure airtight suit including the upper garment and the lower trousers can be realized, saving time, with simple operation and low manufacturing cost. Also, according to the anisotropy of the user's body shape, the matching of upper and lower garments of different sizes can be achieved. And due to the split structure of the upper garment and the lower trousers, the maintenance of the upper garment and the lower trousers can be carried out according to different degrees of damage.

[0007] In addition, the donning and doffing mechanism of the waist-in type positive pressure airtight suit according to the present invention may further have the following additional technical features:

[0008] In some embodiments of the present invention, the upper flange includes a plurality of the guiding holes distributed at equal intervals, the lower flange is provided with a plurality of mounting holes respectively corresponding to the plurality of guiding holes one by one, and the locking bolt assembly includes a plurality and is respectively disposed in the plurality of mounting holes one by one.

[0009] In some embodiments of the present invention, the locking bolt assembly includes: a locking bolt rotatably disposed in the mounting hole; a follower spring located inside the mounting hole and sleeved outside the locking bolt in the mounting hole; and a nut located inside the mounting hole and cooperating with the lower part of the locking bolt.

[0010] In some embodiments of the present invention, the locking bolt further includes a middle step disposed on the locking bolt, the radial dimension of the middle step is greater than the radial dimension of the locking bolt; the mounting hole includes a stepped surface, the middle step is supported on the upper part of the stepped surface of the mounting hole, and the follower spring and the nut are located below the stepped surface of the mounting hole.

[0011] In some embodiments of the present invention, a locking groove is further provided on the upper flange, the locking groove is provided on the guiding hole, and a handle is provided on the locking bolt. When the locking bolt assembly is in the locking position, the handle can be locked in the locking groove in cooperation.

[0012] In some embodiments of the present invention, a sealing ring is provided on the lower flange, the sealing ring is of a hollow structure and the inner cavity of the sealing ring is communicated with the inside of the waist-in type positive pressure airtight suit; a sealing edge is provided on the upper flange, the sealing edge is disposed on the lower part of the inner side of the guiding hole close to the central axis of the upper flange and the sealing edge protrudes downward, and the sealing edge can be in contact and cooperation with the sealing ring.

[0013] In some embodiments of the present invention, a sealing cavity is provided on the lower flange, the sealing ring is disposed in the sealing cavity, a first ventilation hole is formed on the inner wall of the sealing cavity close to the central axis of the lower flange, the first ventilation hole is in internal communication with the inside of the waist-in positive pressure airtight suit, and a second ventilation hole communicating with the first ventilation hole is provided on the inner side surface of the sealing ring.

[0014] In some embodiments of the present invention, a guiding inclined surface is provided at the upper opening of the locking groove.

[0015] In some embodiments of the present invention, the guiding hole is formed as a tapered hole with a smaller upper end and a larger lower end.

[0016] The waist-in positive pressure airtight suit according to the second aspect embodiment of the present invention includes the donning and doffing mechanism of the waist-in positive pressure airtight suit according to the first aspect embodiment above. Since the donning and doffing mechanism of the waist-in positive pressure airtight suit according to the embodiment of the present invention has the above beneficial effects, by providing the donning and doffing mechanism of the waist-in positive pressure airtight suit, the waist-in positive pressure airtight suit according to the embodiment of the present invention can have corresponding beneficial effects, that is, for the waist-in positive pressure airtight suit according to the embodiment of the present invention, due to the donning and doffing mechanism of the waist-in positive pressure airtight suit according to the embodiment of the present invention, by installing an upper flange on the upper garment and a lower flange on the lower trousers, and the upper flange and the lower flange are quickly connected and donned and doffed through the locking bolt assembly, which is convenient and easy to operate, the quick donning and doffing of the waist-in positive pressure airtight suit can be achieved.

[0017] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a schematic structural view of the donning and doffing mechanism of the waist-in positive pressure airtight suit according to the embodiment of the present invention;

[0020] Figure 2 is Figure 1 a partial enlarged view of A in

[0021] Figure 3 is a front sectional view of the donning and doffing mechanism of the waist-in positive pressure airtight suit according to the embodiment of the present invention;

[0022] Figure 4 is Figure 3 a structural enlarged view of B in

[0023] Figure 5It is a schematic diagram of the donning and doffing mechanism of the waist-in type positive pressure airtight suit according to an embodiment of the present invention when it is in the off state;

[0024] Figure 6 It is a schematic structural diagram of the locking bolt assembly of the donning and doffing mechanism of the waist-in type positive pressure airtight suit according to an embodiment of the present invention in the locked position.

[0025] Reference numerals:

[0026] Donning and doffing mechanism 100;

[0027] Upper flange 1; guiding hole 11; locking groove 12; guiding inclined surface 121; sealing edge 13;

[0028] Lower flange 2; mounting hole 21; stepped surface 211; sealing ring 22; second ventilation hole 221; sealing cavity 23; first ventilation hole 231;

[0029] Locking bolt assembly 3; locking bolt 31; middle step 311; handle 312; follower spring 32; nut 33. Detailed implementation manners

[0030] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] The following refers to Figures 1-6 Describe the donning and doffing mechanism 100 of the waist-entry positive pressure airtight suit according to the embodiment of the first aspect of the present invention.

[0034] As Figures 1-4 shown, for the donning and doffing mechanism 100 of the waist-entry positive pressure airtight suit according to the embodiment of the present invention, the waist-entry positive pressure airtight suit includes an upper garment and lower trousers, and the donning and doffing mechanism 100 includes: an upper flange 1, a lower flange 2, and a locking bolt assembly 3.

[0035] The upper flange 1 is connected to the lower edge of the upper garment. A guiding hole 11 is provided on the upper flange 1. The lower flange 2 is connected to the upper edge of the lower trousers, and an installation hole 21 corresponding to the guiding hole 11 is provided on the lower flange 2.

[0036] Specifically, the waist-entry positive pressure airtight suit includes an upper garment and lower trousers. The upper flange 1 is installed at the lower edge of the upper garment. At the same time, a guiding hole 11 is provided on the upper flange 1. The lower flange 2 is installed at the upper edge of the lower trousers. At the same time, an installation hole 21 corresponding to the guiding hole 11 is provided on the lower flange 2.

[0037] Thus, through the cooperation of the guiding hole 11 on the upper flange 1 and the installation hole 21 on the lower flange 2, the positioning of the upper garment and the lower trousers can be facilitated, and the dislocation of the donning and doffing mechanism 100 during use can be prevented.

[0038] As Figures 1-4 shown, the locking bolt assembly 3 is arranged in the installation hole 21. The locking bolt assembly 3 can extend into the guiding hole 11, and the locking bolt assembly 3 can rotate between an unlocking position and a locking position. When the locking bolt assembly 3 is in the unlocking position, the upper flange 1 and the lower flange 2 can be disengaged from each other. When the locking bolt assembly 3 is in the locking position, the upper flange 1 and the lower flange 2 are connected to each other.

[0039] Specifically, the locking bolt assembly 3 is disposed in the mounting hole 21. At the same time, the locking bolt assembly 3 can extend into the guiding hole 11 in the upper flange 1, and the locking bolt assembly 3 is rotatable between an unlocking position and a locking position. Thus, by rotating the locking bolt assembly 3, the locking and unlocking of the upper flange 1 and the lower flange 2 can be achieved. That is, when the locking bolt assembly 3 rotates to the unlocking position, the upper flange 1 can be separated from the lower flange 2, realizing the quick separation of the upper garment and the lower trousers. Correspondingly, when the locking bolt assembly 3 rotates to the locking position, the upper flange 1 and the lower flange 2 can be quickly connected, realizing the quick wearing of the upper garment and the lower trousers.

[0040] For the donning and doffing mechanism 100 of the waist-in type positive pressure airtight suit according to an embodiment of the present invention, since the donning and doffing mechanism 100 of the waist-in type positive pressure airtight suit according to an embodiment of the present invention can quickly realize the connection and separation of the upper flange 1 and the lower flange 2 by switching the rotation of the locking bolt assembly 3 between the unlocking position and the locking position. At the same time, through the cooperation of the locking bolt assembly 3 with the upper flange 1 and the lower flange 2, the quick donning and doffing of the waist-in type positive pressure airtight suit including the upper garment and the lower trousers can be realized, saving time, with simple operation and low manufacturing cost. Moreover, according to the anisotropy of the user's body shape, the matching of upper and lower garments of different sizes can be realized. And due to the split structure of the upper garment and the lower trousers, the inspection and repair of the upper garment and the lower trousers can be realized according to different degrees of damage.

[0041] The following refers to Figures 1-6 Describe in detail the donning and doffing mechanism 100 of the waist-in type positive pressure airtight suit according to an embodiment of the present invention.

[0042] As Figures 1-4 shown, the upper flange 1 includes a plurality of guiding holes 11 evenly distributed at equal intervals. The lower flange 2 is provided with a plurality of mounting holes 21 respectively corresponding to the plurality of guiding holes 11 one by one. The locking bolt assembly 3 includes a plurality of bolts respectively disposed in the plurality of mounting holes 21 one by one.

[0043] Specifically, the upper flange 1 is provided with a plurality of guiding holes 11. At the same time, the lower flange 2 is provided with mounting holes 21 corresponding to the plurality of guiding holes 11. The plurality of guiding holes 11 can cooperate with the plurality of mounting holes 21, thus facilitating the corresponding installation and connection of the upper flange 1 and the lower flange 2, preventing the misalignment of the positions of the upper flange 1 and the lower flange 2. At the same time, the locking bolt assembly 3 is installed in each of the plurality of mounting holes 21. Through the one-to-one correspondence of the locking bolt assembly 3 with the guiding hole 11 and the mounting hole 21, the quick positioning and quick donning and doffing of the upper garment and the lower trousers can be realized, saving time and with simple operation.

[0044] As Figures 3-6 shown, the guiding hole 11 is formed as a tapered hole with a small upper end and a large lower end, that is, the cross-section of the guiding hole 11 is a trapezoidal surface. The radial dimension of the lower end of the guiding hole 11 is large, which is convenient for the locking bolt 31 to be inserted, realizing the quick positioning of the locking bolt 31 and the guiding hole 11.

[0045] As Figures 3-4 shown, the locking bolt assembly 3 includes: a locking bolt 31, a follower spring 32, and a nut 33.

[0046] The locking bolt 31 is rotatably disposed in the mounting hole 21. The follower spring 32 is located inside the mounting hole 21 and sleeved outside the locking bolt 31 in the mounting hole 21. The nut 33 is located inside the mounting hole 21 and cooperates with the lower part of the locking bolt 31.

[0047] Specifically, the locking bolt 31 can rotate in the mounting hole 21. Therefore, when the upper flange 1 is connected to the lower flange 2, the locking bolt assembly 3 can be switched between the locking position and the unlocking position by rotating the locking bolt 31. At the same time, the lower part of the locking bolt 31 is in the mounting hole 21, the follower spring 32 is sleeved on the lower part of the locking bolt 31 inside the mounting hole 21, and the nut 33 and the locking bolt 31 in the mounting hole 21 can be threadedly connected. Thus, through the cooperation of the follower spring 32 and the nut 33, the position of the locking bolt 31 can be effectively restricted, preventing the locking bolt 31 from being pulled by an external force and disengaging from the mounting hole 21.

[0048] As Figures 3-4 shown, the locking bolt 31 further includes a middle step 311 provided on the locking bolt 31. The radial dimension of the middle step 311 is larger than the radial dimension of the locking bolt 31. The mounting hole 21 includes a stepped surface 211. The middle step 311 is supported on the upper part of the stepped surface 211 of the mounting hole 21. The follower spring 32 and the nut 33 are located below the stepped surface 211 of the mounting hole 21.

[0049] As Figures 3-4 shown, a middle step 311 is provided in the middle of the locking bolt 31. The radial dimension of the middle step 311 is larger than the radial dimension of the locking bolt 31. Thus, the middle step 311 forms a limiting structure in the middle of the locking bolt 31. At the same time, the middle step 311 cooperates with the mounting hole 21, which can prevent the position of the locking bolt 31 from sliding down in the mounting hole 21 and play a role in limiting the locking bolt 31.

[0050] Furthermore, the follower spring 32 and the nut 33 are below the stepped surface 211, that is, the follower spring 32 is stuck between the nut 33 and the stepped surface 211, and at the same time cooperates with the part of the locking bolt 31 inside the mounting hole 21, which can effectively prevent the position of the locking bolt 31 from moving up and disengaging from the mounting hole 21.

[0051] In summary, by the cooperation of the middle step 311 and the mounting hole 21, the position of the locking bolt 31 can be prevented from sliding downward, and by the cooperation of the nut 33 and the follower spring 32, the locking bolt 31 can be prevented from disengaging from the mounting hole 21 under the action of external force. Thus, the position of the locking bolt 31 can be limited, ensuring that the locking bolt 31 can play a safe and stable role during use.

[0052] As Figures 1-6 shown, a locking groove 12 is further provided on the upper flange 1. The locking groove 12 is provided on the guiding hole 11. A handle 312 is provided on the locking bolt 31. When the locking bolt assembly 3 is in the locking position, the handle 312 can be cooperatively locked in the locking groove 12.

[0053] As Figure 4 shown, the locking groove 12 is provided on the guiding hole 11. When the upper flange 1 is connected to the lower flange 2, the upper part of the locking bolt 31 passes through the guiding hole 11. A handle 312 is provided on the locking bolt 31. By rotating the handle 312, the locking bolt 31 can be rotated. When the handle 312 is inside the locking groove 12, the upper flange 1 and the lower flange 2 are in a locked state.

[0054] In other words, as Figure 5 shown, by rotating the handle 312 of the locking bolt assembly 3, the locking bolt 31 can be rotated. When the handle 312 is inside the locking groove 12, the upper flange 1 and the lower flange 2 can be connected. Through the locking bolt 31, the rapid connection and disengagement of the upper flange 1 and the lower flange 2 can be realized.

[0055] As Figures 3-6 shown, a guiding inclined surface 121 is provided at the upper opening of the locking groove 12.

[0056] The guiding inclined surface 121 is an inclined surface, which can facilitate the rotation of the handle 312 when the locking bolt 31 rotates. That is, when the locking bolt assembly 3 is in the locking state, the handle 312 can be quickly rotated into the locking groove 12 through the guiding inclined surface 121, realizing the rapid connection of the upper flange 1 and the lower flange 2, and at the same time preventing the handle 312 from rotating and disengaging from the locking groove 12, resulting in the disconnection of the upper flange 1 and the lower flange 2 when the waist-in type positive pressure airtight suit is worn.

[0057] As Figures 1-6 shown, a sealing ring 22 is provided on the lower flange 2. The sealing ring 22 is of a hollow structure and the inner cavity of the sealing ring 22 is communicated with the inside of the waist-in type positive pressure airtight suit. The upper flange 1 is provided with a sealing edge 13. The sealing edge 13 is provided at the lower part of the inner side of the guiding hole 11 close to the central axis of the upper flange 1 and the sealing edge 13 protrudes downward. The sealing edge 13 can be in contact and cooperation with the sealing ring 22.

[0058] As Figure 4As shown in the figure, the sealing ring 22 is provided on the lower flange 2 and the sealing ring 22 has a hollow structure inside. At the same time, the sealing ring 22 is in communication with the inside of the waist-in type positive pressure airtight suit. A sealing edge 13 is provided on the upper flange 1, and the sealing edge 13 protrudes downward. Therefore, the sealing edge 13 can cooperate with the sealing ring 22 to seal the inside of the waist-in type positive pressure airtight suit.

[0059] Furthermore, the inside of the sealing ring 22 is a hollow structure, so the sealing ring 22 can be in communication with the inside of the waist-in type positive pressure airtight suit. Thus, when there is positive pressure air inside the waist-in type positive pressure airtight suit, gas can be filled into the inside of the sealing ring 22, causing the sealing ring 22 to expand and fit tightly with the sealing edge 13, so that the waist-in type positive pressure airtight suit has a good sealing effect.

[0060] At the same time, the communication between the sealing ring 22 and the waist-in type positive pressure airtight suit can achieve positive feedback sealing of the sealing ring 22, that is, the greater the internal pressure of the waist-in type positive pressure airtight suit, the closer the sealing ring 22 fits with the sealing edge 13, so that the sealing effect of the waist-in type positive pressure airtight suit is stronger.

[0061] As Figure 3 and Figure 4 shown in the figure, a sealing cavity 23 is provided on the lower flange 2, the sealing ring 22 is provided in the sealing cavity 23, a first ventilation hole 231 is opened on the inner wall of the sealing cavity 23 close to the central axis of the lower flange 2, the first ventilation hole 231 is in communication with the inside of the waist-in type positive pressure airtight suit, and a second ventilation hole 221 communicating with the first ventilation hole 231 is provided on the inner side surface of the sealing ring 22.

[0062] Specifically, a sealing cavity 23 is opened on the lower flange 2, the sealing ring 22 is placed inside the sealing cavity 23, a first ventilation hole 231 is provided on one side of the inside of the sealing cavity 23 close to the central axis of the lower flange 2, and a second ventilation hole 221 corresponding to the first ventilation hole 231 is provided on the sealing ring 22. Thus, the sealing cavity 23 is in communication with the inside of the waist-in type positive pressure airtight suit through the first ventilation hole 231, and the sealing ring 22 is in communication with the sealing cavity 23 through the second ventilation hole 221.

[0063] It can be seen from this that the inside of the waist-in type positive pressure airtight suit, the sealing cavity 23 and the sealing ring 22 are in communication. Through the positive atmospheric pressure inside the waist-in type positive pressure airtight suit, the inside of the sealing ring 22 can be inflated and expanded through the first ventilation hole 231 and the second ventilation hole 221, and fit tightly with the sealing edge 13 to achieve the sealing of the waist-in type positive pressure airtight suit.

[0064] Next, a waist-in type positive pressure airtight suit according to an embodiment of the second aspect of the present invention will be described.

[0065] The waist-in type positive pressure airtight suit according to an embodiment of the present invention includes a donning and doffing mechanism 100 of the waist-in type positive pressure airtight suit according to the embodiment of the first aspect above. Since the donning and doffing mechanism 100 of the waist-in type positive pressure airtight suit according to the embodiment of the present invention has the above beneficial effects, by providing the donning and doffing mechanism 100 of the waist-in type positive pressure airtight suit, the waist-in type positive pressure airtight suit according to the embodiment of the present invention can have corresponding beneficial effects, that is, for the waist-in type positive pressure airtight suit according to the embodiment of the present invention, because the donning and doffing mechanism 100 of the waist-in type positive pressure airtight suit according to the embodiment of the present invention installs an upper flange 1 on the upper garment and a lower flange 2 on the lower trousers, and the upper flange 1 and the lower flange 2 are quickly connected and donned and doffed through a locking bolt assembly 3, which is convenient and easy to operate, and the quick donning and doffing of the waist-in type positive pressure airtight suit can be realized.

[0066] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0067] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A donning and doffing mechanism for a lumbar-entry positive pressure airtight suit, characterized in that The waist-in type positive pressure airtight suit includes an upper garment and lower trousers, and the donning and doffing mechanism includes: an upper flange, which is connected to the lower edge of the upper garment, and a guiding hole is provided on the upper flange; a lower flange, which is connected to the upper edge of the lower trousers, and a mounting hole corresponding to the guiding hole is provided on the lower flange; a locking bolt assembly, which is arranged in the mounting hole, the locking bolt assembly can extend into the guiding hole, and the locking bolt assembly can rotate between an unlocking position and a locking position. When the locking bolt assembly is in the unlocking position, the upper flange and the lower flange can be disengaged from each other. When the locking bolt assembly is in the locking position, the upper flange and the lower flange are connected to each other; The locking bolt assembly includes: a locking bolt, which is rotatably arranged in the mounting hole; a follow-up spring, which is located inside the mounting hole and sleeved outside the locking bolt in the mounting hole; a nut, which is located inside the mounting hole and cooperates with the lower part of the locking bolt; The locking bolt further includes a middle step provided on the locking bolt, and the radial dimension of the middle step is larger than the radial dimension of the locking bolt; The mounting hole includes a stepped surface, the middle step is supported on the upper part of the stepped surface of the mounting hole, and the follow-up spring and the nut are located below the stepped surface of the mounting hole; A locking groove is further provided on the upper flange, and the locking groove is provided on the guiding hole. A handle is provided on the locking bolt. When the locking bolt assembly is in the locking position, the handle can be locked in the locking groove in cooperation; a sealing ring is provided on the lower flange. The sealing ring is of a hollow structure and the inner cavity of the sealing ring is communicated with the inside of the waist-in type positive pressure airtight suit; The upper flange is provided with a sealing edge, the sealing edge is provided at the lower part of the inner side of the guiding hole close to the central axis of the upper flange and the sealing edge protrudes downward, and the sealing edge can be in contact and cooperation with the sealing ring; The lower flange is provided with a sealing cavity, the sealing ring is arranged in the sealing cavity, a first ventilation hole is opened on the inner wall of the sealing cavity close to the central axis of the lower flange, the first ventilation hole is communicated with the inside of the waist-in type positive pressure airtight suit, and a second ventilation hole communicated with the first ventilation hole is provided on the inner side surface of the sealing ring; 2. The donning / doffing mechanism of the lumbar-entry positive pressure airtight suit according to claim 1, wherein, The upper flange includes a plurality of the guiding holes distributed at equal intervals, the lower flange is provided with a plurality of the mounting holes respectively corresponding to the plurality of guiding holes one by one, and the locking bolt assemblies include a plurality and are respectively arranged in the plurality of mounting holes one by one; 3. The donning and doffing mechanism of the waist-in type positive pressure airtight suit according to claim 1, wherein a guiding inclined surface is provided at the upper opening of the locking groove.

4. The donning and doffing mechanism of the lumbar-entry positive pressure airtight suit according to claim 1, characterized in that, The guiding hole is formed as a tapered hole with a small upper end and a large lower end.

5. A waist-in type positive pressure airtight suit, including the donning and doffing mechanism of the waist-in type positive pressure airtight suit according to any one of claims 1 to 4.

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