Piston, rubber tube and rubber gun

Abstract

This invention provides a piston, a glue cartridge, and a glue gun. The piston engages with an external device via a snap-fit ​​mechanism, limiting axial sliding and eliminating radial offset to improve directional stability. Glue caps are interchangeably mounted at both ends of the glue cartridge. Combined with the bidirectional reciprocating motion of the piston, this allows for the reuse of the glue cartridge, thereby reducing resource waste. The glue gun utilizes a flexible glue-containing bag and a recessed structure to fix a sealing ring, achieving self-sealing extrusion and solving the problems of poor environmental performance, low space utilization, and high operating costs associated with disposable glue guns.

Description

Technical Field

[0001] This utility model relates to the field of glue guns, and more particularly to a piston, glue cartridge and glue gun. Background Technology

[0002] As an indispensable fluid control device in modern industrial and civilian fields, glue guns are widely used in building curtain wall sealing, automotive parts bonding, electronic component packaging, and home decoration repair. Their main function is to achieve directional and quantitative delivery of high-viscosity colloids, sealants, and other materials. In precision machining processes, the performance of glue guns directly affects product yield and operational efficiency. Furthermore, with the deepening of intelligent manufacturing and green production concepts, the structural reliability, environmental adaptability, and operational economy of glue guns have become key indicators for evaluating equipment performance.

[0003] However, most current mainstream glue gun products adopt a non-removable, disposable design, which presents several problems: First, from an environmental perspective, the integrated design of the piston, cartridge, and push rod leads to localized wear and glue residue, rendering the entire glue gun unusable. Furthermore, the large number of engineering plastic components cannot be recycled, causing environmental issues. Second, in terms of storage and transportation, the rigid, fixed geometry and internal support structure of disposable glue guns severely restrict stacking density, resulting in numerous ineffective gaps during transportation and higher costs. Finally, in terms of usage costs, the frequent need to replace glue guns increases the user's overall expenses, especially in high-frequency operation scenarios where consumable costs far exceed the initial equipment investment, and the interruption of operation for equipment replacement significantly reduces continuous operation efficiency.

[0004] In conclusion, there is currently no glue gun designed to address these issues. Utility Model Content

[0005] In order to overcome the above-mentioned technical defects, the purpose of this utility model is to provide a piston, a glue cylinder and a glue gun.

[0006] The first aspect of this utility model discloses a piston, which includes a first part. The first part includes a main body part and a snap-fit ​​part that are sequentially arranged and fixed to each other in a first direction.

[0007] The snap-fit ​​portion is arranged around the outer periphery of the main body and extends outward, and is fixedly connected to the main body. When the snap-fit ​​portion is snapped into an external device, the piston slides in a first direction inside the external device.

[0008] The piston is locked in place with other components (such as a rubber sleeve) via a snap-fit ​​mechanism, enabling linear sliding in the first direction and restricting excess degrees of freedom. When the snap-fit ​​mechanism engages with other components, the piston can only slide axially, preventing radial offset or rotation, thus improving the orientation and stability of the piston's movement among other components and simplifying the assembly structure.

[0009] Preferably, the snap-fit ​​portion includes a plurality of outwardly extending spring tabs and a retaining ring. The ends of the plurality of spring tabs away from the retaining ring are tilted upward relative to the retaining ring in a first direction.

[0010] The retaining ring is sleeved on the main body and fixed by a plurality of limiting parts provided on the surface of the main body facing the retaining ring, thereby fixing the snap-fit ​​part to the main body.

[0011] This can be understood as follows: the raised end of the spring allows it to elastically deform under pressure. When the piston is inside other components, the spring elastically abuts against them, achieving a tighter limiting effect and ensuring a good seal when the piston and other components are in contact. The retaining ring is fixed to the main body via the limiting part, ensuring the overall firmness of the locking mechanism. This design balances ease of assembly with reliability, preventing loosening after long-term use.

[0012] Preferably, at least one guide portion protruding from the outer side of the plurality of spring pieces is further provided, and the guide portion extends in a second direction. The second direction is perpendicular to the first direction.

[0013] Furthermore, by providing multiple guide sections, the piston can be made to slide smoothly by cooperating with the guide sections and the corresponding guide grooves in other components, thereby further limiting radial displacement, enhancing the accuracy of the motion trajectory, and enabling the piston to run smoothly along the preset trajectory.

[0014] Preferably, the piston further includes a second part, the structure of which is the same as the first part. The first part and the second part are arranged opposite to each other, and the main body of the second part is fitted and fixed to the main body of the first part.

[0015] By symmetrically adding a second part, the piston forms a double-ended thrust structure. It slides bidirectionally among the other components, thus balancing the force on the piston, reducing unilateral wear, and extending its service life. Furthermore, once it slides to its limit in one direction, there is no need to distinguish the piston's orientation; simply reverse the direction and insert the piston, further simplifying assembly operations during use.

[0016] Preferably, the first part is provided with a first limiting rib and a first limiting groove arranged circumferentially. The second part is provided with a second limiting rib and a second limiting groove arranged circumferentially.

[0017] The first limiting rib and the second limiting groove cooperate to fasten and fix the first part and the second part together.

[0018] This structural design allows for rapid assembly and secure fixing of the first and second parts. The circumferentially designed first and second limiting grooves, along with the dual fixing mechanism of the second limiting rib and second limiting groove, not only enhance the overall rigidity of the piston structure but also improve the fixing effect between the various piston components.

[0019] A second aspect of this utility model discloses a rubber tube, which includes a rubber cap, a body, and a piston as described in any of the preceding claims. The body extends along a first direction and has a first end and a second end disposed opposite to each other in the first direction. The rubber cap is fitted onto the first end or the second end of the body.

[0020] When the piston is placed inside the main body, it is pushed by an external force and reciprocates along the main body.

[0021] This can be understood as follows: The main body of the glue cartridge provided in this application, by setting its first and second ends to be connectable to a glue cap, allows both the first and second ends of the main body to serve as glue dispensing ends. The glue cap is connected to the first and second ends of the main body via a sleeve-fitting method, enabling quick assembly and disassembly of the glue cap. Furthermore, a piston capable of reciprocating along the main body is provided within it, allowing the glue cartridge provided in this application to be reused repeatedly. This significantly reduces usage costs and minimizes resource waste.

[0022] Preferably, when the piston's engaging portion includes a plurality of outwardly extending spring pieces and a retaining ring; the ends of the plurality of spring pieces away from the retaining ring are tilted upward relative to the retaining ring in a first direction; and at least one guide portion protruding from the spring pieces is also provided on the outer side of the plurality of spring pieces, the guide portion extending in a second direction;

[0023] The main body is provided with multiple guide grooves extending along a first direction. The structure of the guide grooves corresponds to the guide portion of the spring piece, so that the guide portion slides within the guide groove.

[0024] The corresponding fit between the guide groove inside the main body and the piston guide section forces the piston to slide along a preset trajectory, completely eliminating the risk of radial deviation. It is especially suitable for high-viscosity fluid propulsion scenarios, ensuring uniform dispensing.

[0025] Preferably, the surface of the rubber cap facing the main body is also provided with piercing teeth for piercing objects inside the main body.

[0026] The main body is also provided with a plurality of first guide portions and a plurality of first guide grooves at both ends. The plurality of first guide portions protrude from the main body and extend along a first direction. The plurality of first guide grooves are formed by inward recesses in the main body and extend along the circumference of the main body.

[0027] The rubber cap is provided with a plurality of second guide grooves corresponding one-to-one with a plurality of first guide portions, and a plurality of second guide portions corresponding one-to-one with a plurality of first guide grooves. When the plurality of first guide portions engage with the plurality of second guide grooves, and when the plurality of first guide grooves and the plurality of second guide portions engage, the rubber cap and the main body are relatively fixed in a second direction.

[0028] Furthermore, by incorporating piercing teeth, the contents of the main body (such as a plastic bag) can be automatically pierced when the piston compresses them, eliminating the need for manual pre-opening and improving operational efficiency. Moreover, through the circumferential and axial dual cooperation between multiple first guide parts and multiple second guide grooves, precise positioning and locking of the plastic cap to the main body are achieved, preventing the cap from falling off under pressure and ensuring accurate alignment of the piercing position.

[0029] The third aspect of this utility model discloses a glue gun, including a first component. The first component includes a piston as described in any of the preceding claims, a glue cartridge as described in any of the preceding claims, and a flexible glue-containing bag.

[0030] By employing a first component, which includes any of the aforementioned piston, glue cartridge, and flexible glue bag, the glue gun can be reused repeatedly. Firstly, the flexible glue bag can be designed as a disposable structure. In actual use, the flexible glue bag can be directly fed into the glue cartridge without opening it; the bag is simply punctured by the piercing teeth, thus preventing glue overflow and cartridge contamination before the flexible glue bag is in place. During use, the piston squeezes the flexible glue bag until all the glue inside is used up. Simply replace the flexible glue bag with a new one and return the piston and glue cartridge to their proper positions for continued use. This completely solves the environmental, cost, and efficiency problems caused by the non-reusability of glue guns.

[0031] Preferably, a flexible plastic bag is disposed within the main body of the plastic cartridge. A piston is disposed on the side of the flexible plastic bag away from the plastic cap, such that by sliding and squeezing the flexible plastic bag in a first direction, when the flexible plastic bag has an opening facing the plastic cap, the contents of the flexible plastic bag can flow through the opening to the plastic cap and out of the plastic cap.

[0032] The flexible plastic bag also includes metal sealing rings. The metal sealing rings are fixed to both ends of the flexible plastic bag to allow the ends of the bag to contract and close. The cap has a first recess, and the piston has a second recess, for accommodating the metal sealing rings on both sides of the flexible plastic bag.

[0033] The glue gun also includes a second component, which has the same structure as the first component and is arranged side by side. The flexible glue bag of the first component contains the base glue, and the flexible glue bag of the second component contains the hardener.

[0034] The flexible plastic bag achieves sealed storage of fluid by shrinking and closing both ends with metal sealing rings. The recessed structures of the cap and piston further secure the metal sealing rings at both ends of the bag, preventing displacement or wrinkling. Furthermore, even after the flexible plastic bag is punctured by the puncture teeth, the contents can only flow out through the opening because the metal sealing rings are within the recessed structure, thus achieving self-sealing of the flexible plastic bag.

[0035] The first and second components, arranged side-by-side, can respectively hold the base adhesive and the hardener, achieving synchronous and proportional propagation of the two-component fluids through their identical structure. This ensures uniform curing reaction and is suitable for two-component adhesive applications requiring precise mixing ratios. Furthermore, because all parts of the glue gun are reusable, the specific contents of the first and second components can be adjusted at any time during use, making the glue gun more flexible in its operation. Attached Figure Description

[0036] Figure 1 A three-dimensional structural schematic diagram of the piston provided in this application;

[0037] Figure 2 A schematic diagram of the exploded structure of the piston provided in this application;

[0038] Figure 3 A three-dimensional structural diagram of the glue cartridge provided in this application;

[0039] Figure 4 A three-dimensional structural diagram of the main body provided for this application;

[0040] Figure 5 A schematic diagram of the mating structure between the main body and the piston provided in this application;

[0041] Figure 6 A schematic diagram of the mating structure of the main body and piston from another perspective, provided for this application;

[0042] Figure 7 This is a schematic diagram of the structure of the rubber cap provided in this application;

[0043] Figure 8 This is a schematic diagram of the glue gun provided in this application.

[0044] Reference numerals: 100, piston; 200, glue cartridge; 300, glue gun;

[0045] 1. First part; 11. Main body; 12. Snap-fit ​​part; 121. Spring piece; 122. Retaining ring; 123. Guide part; 13. Second recess; 15. First limiting groove;

[0046] 3. Second part; 31. Main body; 32. Snap-fit ​​part; 33. Second limiting rib; 34. Second limiting groove;

[0047] 4. Glue cap; 41. Piercing tooth; 42. Second guide groove; 43. Second guide part; 44. First recess;

[0048] 5. Main body; 51. First end; 52. Second end; 53. Guide groove; 54. First guide part; 55. First guide groove;

[0049] 6. First component;

[0050] 7. Second component;

[0051] z, first direction; x, second direction. Detailed Implementation

[0052] The advantages of this utility model are further illustrated below with reference to the accompanying drawings and specific embodiments.

[0053] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0054] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0055] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if," as used herein, can be interpreted as "when," "in response to determination," or "when," or "in the event of a determination."

[0056] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0058] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrating this invention and has no specific meaning in itself. Therefore, "module" and "part" can be used interchangeably.

[0059] First, please refer to Figures 1-2 , Figure 1 A three-dimensional structural schematic diagram of the piston provided in this application; Figure 2 A schematic diagram of the exploded structure of the piston provided in this application.

[0060] like Figures 1-2 As shown, the first aspect of this utility model discloses a piston 100, which includes a first part 1. The first part 1 includes a main body part 11 and a snap-fit ​​part 12 that are sequentially arranged and fixed to each other in a first direction z.

[0061] The snap-fit ​​portion 12 is arranged around the outer periphery of the main body portion 11 and extends outward, and is fixedly connected to the main body portion 11. When the snap-fit ​​portion 12 is snapped into an external device, the piston 100 slides along the first direction z inside the external device.

[0062] The piston 100 is locked in place with other components (such as the rubber sleeve 200) via the snap-fit ​​part 12, achieving linear sliding in the first direction z and restricting excess degrees of freedom. When the snap-fit ​​part 12 is engaged with other components, the piston 100 can only slide along the axial direction (first direction z), preventing radial offset or rotation, improving the orientation and stability of the piston 100's movement in other components, and simplifying the assembly structure.

[0063] The above describes the basic structure and function of the piston 100 provided in this application. Those skilled in the art will understand that the piston 100 may include more or fewer structures, and the specific structure of each component in the piston 100 is not limited. The possible specific structures will be described below with reference to the accompanying drawings.

[0064] Continue to refer to Figures 1-2 In one possible implementation, the snap-fit ​​portion 12 includes a plurality of outwardly extending spring tabs 121 and a retaining ring 122. The ends of the plurality of spring tabs 121 away from the retaining ring 122 are tilted relative to the retaining ring 122 in a first direction z. The retaining ring 122 is sleeved on the main body portion 11 and is fixed by a plurality of limiting portions provided on the surface of the main body portion 11 facing the retaining ring 122, thereby fixing the snap-fit ​​portion 12 to the main body portion 11.

[0065] This can be understood as the snap-fit ​​part 12 being specifically designed as a spring plate 121 structure. Through the upward-curving design of one end of the spring plate 121, it undergoes elastic deformation under pressure. When the piston 100 is located inside other components, it can elastically abut against these components, achieving a tighter limiting effect and ensuring a good seal when other components and the piston 100 are in contact. The retaining ring 122 is fixed to the main body 11 through the limiting part, ensuring the overall robustness of the snap-fit ​​part 12. This design balances ease of assembly with reliability in use, preventing loosening after long-term use.

[0066] Furthermore, in one possible implementation, at least one guide portion 123 protruding from the outer side of the plurality of spring pieces 121 is also provided, the guide portion 123 extending in a second direction x. The second direction x is perpendicular to the first direction z. The first direction z mentioned here may be understood as the axial direction of the piston 100, the glue cartridge 200, or the glue gun 300. Correspondingly, the second direction x may be understood as the radial direction of the piston 100, the glue cartridge 200, or the glue gun 300.

[0067] By further providing multiple guide portions 123 on the outer side of multiple spring pieces 121, the piston 100 can be further restricted in radial displacement during sliding by the cooperation of the guide portions 123 and the guide grooves 53 correspondingly provided in other components, thereby enhancing the accuracy of the motion trajectory and enabling the piston 100 to run smoothly along the preset trajectory.

[0068] Those skilled in the art will understand that the specific types of other components described herein are not limited. For example, they may be the glue cartridge 200 mentioned later. In another possible implementation, they may also be medical injection devices or food decorating guns, etc. This application does not impose any limitations here either. For ease of explanation and understanding, the glue cartridge 200 will be used as an example in the following description.

[0069] The above is a description of the possible specific structure of the snap-fit ​​part 12.

[0070] Continue to refer to Figures 1-2 As previously mentioned, piston 100 may include more or fewer structures.

[0071] Therefore, in one possible implementation, the piston 100 further includes a second part 3, the structure of which is the same as that of the first part 1. The first part 1 and the second part 3 are arranged opposite to each other, and the main body 31 of the second part 3 is fitted and fixed to the main body 11 of the first part 1.

[0072] This can be understood as: such as Figures 1-2 As shown, the piston 100 also includes a second part 3 that is structurally identical to the first part 1. By symmetrically adding the second part 3, the piston 100 forms a double-ended thrust structure. It slides bidirectionally among other components, thereby balancing the forces on the piston 100, reducing unilateral wear, and extending its service life. Furthermore, when sliding to its limit in one direction, there is no need to distinguish the front or back of the piston 100; simply reverse the direction and insert the piston 100, further simplifying the assembly operation during use.

[0073] Those skilled in the art will understand that the specific fixing method of Part 1 and Part 3 is also not limited.

[0074] In one possible implementation, such as Figures 1-2 As shown, the first part 1 is provided with a first limiting rib (not shown in the figure) and a first limiting groove 15 arranged circumferentially. The second part 3 is provided with a second limiting rib 33 and a second limiting groove 34 arranged circumferentially. The first limiting rib and the second limiting groove 34 cooperate, and the first limiting groove 15 and the second limiting rib 33 cooperate, thereby fastening and fixing the first part 1 and the second part 3 together.

[0075] This structural design enables rapid assembly and secure fixing of the first part 1 and the second part 3. The dual fixing mechanism of the circumferentially designed first limiting rib and second limiting groove 34, and the second limiting rib 33 and first limiting groove 15, not only improves the overall structural rigidity of the piston 100, but also enhances the fixing effect between the various components of the piston 100.

[0076] The above is a detailed description of the possible structure of the piston 100 provided in this application. The rubber sleeve 200 provided in this application will be described below with reference to the accompanying drawings.

[0077] Please see Figures 3-7 , Figure 3 A three-dimensional structural diagram of the glue cartridge provided in this application; Figure 4 A three-dimensional structural diagram of the main body provided in this application; a schematic diagram of the mating structure between the main body and the piston provided in this application; Figure 6 A schematic diagram of the mating structure of the main body and piston from another perspective, provided for this application; Figure 7 This is a schematic diagram of the structure of the rubber cap provided in this application.

[0078] like Figures 3-6 As shown, the second aspect of this utility model discloses a rubber sleeve 200, which includes a rubber cap 4, a main body 5, and a piston 100 as described in any of the preceding claims. The main body 5 extends along a first direction z and has a first end 51 and a second end 52 disposed opposite to each other in the first direction z. The rubber cap 4 is sleeved on the first end 51 or the second end 52 of the main body 5.

[0079] When piston 100 is placed inside body 5, piston 100 is pushed by external force and reciprocates within body 5.

[0080] This can be understood as follows: The main body 5 of the glue cartridge 200 provided in this application, by setting the first end 51 and the second end 52 to be connected to the glue cap 4, allows both the first end 51 and the second end 52 of the main body 5 to serve as glue dispensing ends. The glue cap 4 is connected to the first end 51 and the second end 52 of the main body 5 by a sleeve-fitting method. After the piston 100 is pushed from the second end 52 to the first end 51, the glue cap 4 only needs to be removed, new contents put in, and the glue cap 4 can be sleeved on the second end 52 for continued use, realizing quick-release and bidirectional use of the glue cartridge 200. Furthermore, the main body 5 is also provided with a piston 100 that can reciprocate along the main body 5. These designs allow the glue cartridge 200 provided in this application to be reused repeatedly. This greatly saves on usage costs and reduces resource waste.

[0081] Furthermore, the main body 5 is provided with a plurality of guide grooves 53 extending along the first direction z. The structure of the guide grooves 53 corresponds to the guide portion 123 of the spring piece 121, so that the guide portion 123 slides within the guide grooves 53.

[0082] The corresponding engagement between the guide groove 53 inside the main body 5 and the guide part 123 of the piston 100 forces the piston 100 to slide along a preset trajectory, completely eliminating the risk of radial offset. This is especially suitable for high-viscosity fluid propulsion scenarios, ensuring uniform dispensing.

[0083] The above describes the structural design of the main body 5 and piston 100 in the glue cartridge 200 provided in this application. The structural design of the main body 5 and glue cap 4 will be described below.

[0084] Continue to refer to Figures 3-6In one possible implementation, the two ends of the main body 5 are further provided with a plurality of first guide portions 54 and a plurality of first guide grooves 55. The plurality of first guide portions 54 protrude from the main body 5 and extend along a first direction z. The plurality of first guide grooves 55 are formed by inward recesses in the main body 5 and extend along the circumference of the main body 5.

[0085] The rubber cap 4 is provided with a plurality of second guide grooves 42 corresponding one-to-one with a plurality of first guide portions 54, and a plurality of second guide portions 43 corresponding one-to-one with a plurality of first guide grooves 55. When the plurality of first guide portions 54 engage with the plurality of second guide grooves 42, and when the plurality of first guide grooves 55 engage with the plurality of second guide portions 43, the rubber cap 4 and the main body 5 are relatively fixed in the second direction x.

[0086] This can be understood as follows: the rubber cap 4 and the main body 5 are respectively provided with a dual fixing structure in the axial direction (first direction z) and the circumferential direction. Multiple first guide parts 54 extend axially and cooperate with corresponding second guide grooves 42 that also extend axially. Multiple second guide parts 43 extend circumferentially and cooperate with corresponding first guide grooves 55 that also extend circumferentially, thereby achieving precise positioning and locking of the rubber cap 4 and the main body 5, preventing the rubber cap 4 from falling off under pressure.

[0087] Furthermore, the surface of the cap 4 facing the main body 5 is also provided with piercing teeth 41 for piercing objects inside the main body 5. By providing piercing teeth 41, the contents of the main body 5 (such as a plastic bag) can be automatically pierced when the piston 100 squeezes it, eliminating the need for manual pre-opening and improving operational efficiency. Moreover, through the aforementioned dual fixing structure in both the axial and circumferential directions, the piercing position of the cap 4 can be made more precise.

[0088] The above describes the possible structure of the glue cartridge 200 provided in this application. The glue gun provided in this application will be described below.

[0089] like Figures 1-7 As shown, a third aspect of this application also provides a glue gun 300, including a first component 6. The first component 6 includes a piston 100 as in any of the foregoing embodiments, a glue cartridge 200 as in any of the foregoing embodiments, and a flexible glue-containing bag (not shown in the figure).

[0090] The glue gun 300, by employing a first component 6, which includes any of the aforementioned piston 100, glue cartridge 200, and flexible glue bag, allows for repeated use. Firstly, the flexible glue bag can be designed as a disposable structure. In actual use, the flexible glue bag can be directly fed into the glue cartridge 200 without opening it; the bag is simply punctured by the piercing teeth 4, thus preventing glue overflow and contamination of the glue cartridge 200 before the flexible glue bag is in place. During use, the flexible glue bag can be squeezed by the piston 100. Once all the glue in the flexible glue bag is used up, simply replace it with a new flexible glue bag and reset the piston 100 and glue cartridge 200 to the appropriate positions for continued use. This completely solves the environmental, cost, and efficiency problems caused by the non-reusability of the glue gun 300.

[0091] Specifically, a flexible plastic bag is disposed inside the main body 5 of the plastic cylinder 200. A piston 100 is disposed on the side of the flexible plastic bag away from the plastic cap 4, so that by sliding and squeezing the flexible plastic bag in the first direction z, when the flexible plastic bag has an opening facing the plastic cap 4, the contents of the flexible plastic bag can flow through the opening to the plastic cap 4 and out of the plastic cap 4.

[0092] The flexible plastic bag also includes metal sealing rings. The metal sealing rings are fixed to both ends of the flexible plastic bag to allow the two ends of the flexible plastic bag to contract and close. The cap 4 is provided with a first recess 44, and the piston 100 is provided with a second recess 13, for accommodating the metal sealing rings on both sides of the flexible plastic bag.

[0093] By shrinking and closing the two ends of the flexible plastic bag with metal sealing rings, the fluid can be stored in a sealed manner. The metal sealing rings at both ends of the bag are fixed by the recessed structures of the cap 4 and the piston 100, preventing displacement or wrinkling of the flexible plastic bag. Furthermore, after the flexible plastic bag is punctured by the puncture tooth 41, because the metal sealing rings are within the recessed structure, the contents of the flexible plastic bag can only flow out through the opening, achieving self-sealing of the flexible plastic bag.

[0094] It should be noted that the glue gun 300 provided in this application may also include more components to achieve more complex functions or to adapt to the special needs of certain types of glue.

[0095] For example, in one possible implementation, the glue gun 300 further includes a second component 7, which has the same structure as the first component 6 and is arranged side by side. The flexible glue-containing pouch of the first component 6 is provided with base glue, and the flexible glue-containing pouch of the second component 7 is provided with a hardener.

[0096] At this point, glue gun 300 can be used to store and extrude AB glue. Specifically, the base glue can be acrylic-modified epoxy or epoxy resin, or contain catalysts and other additives. The hardener can be modified amine or other hardeners, or contain catalysts and other additives.

[0097] The first component 6 and the second component 7, arranged side-by-side, can respectively contain the base adhesive and the hardener, and their identical structure enables the synchronous and proportional propagation of the two-component fluids. This ensures uniform curing reaction and is suitable for two-component adhesive applications requiring precise mixing. Furthermore, because all parts of the glue gun 300 are reusable, the specific contents of the first component 6 and the second component 7 can be adjusted at any time during use, simply by replacing the flexible adhesive bag, thus making the glue gun 300 more flexible in use.

[0098] It should be noted that the embodiments of this utility model have better implementability and are not intended to limit this utility model in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A piston characterized by, The piston includes a first part; the first part includes a main body part and a snap-fit ​​part that are sequentially arranged and fixed to each other in a first direction; The snap-fit ​​portion is arranged around the outer periphery of the main body and extends outward, and is fixedly connected to the main body; when the snap-fit ​​portion is snapped into an external device, the piston slides along the first direction inside the external device.

2. The piston of claim 1 wherein, The snap-fit ​​portion includes a plurality of outwardly extending spring tabs and a retaining ring; the ends of the plurality of spring tabs away from the retaining ring are raised relative to the retaining ring in the first direction; The retaining ring is sleeved on the main body and fixed by a plurality of limiting portions provided on the surface of the main body facing the retaining ring, thereby fixing the snap-fit ​​portion to the main body.

3. The piston of claim 2 wherein, The outer side of each of the plurality of spring pieces is also provided with at least one guide portion protruding from the spring piece, the guide portion extending in a second direction; the second direction is perpendicular to the first direction.

4. The piston of claim 1 wherein, The piston further includes a second part, the structure of which is the same as that of the first part; the first part and the second part are arranged opposite to each other, and the main body of the second part is fitted and fixed to the main body of the first part.

5. The piston as claimed in claim 4, characterized in that, The first part is provided with a first limiting rib and a first limiting groove arranged along the circumferential direction; the second part is provided with a second limiting rib and a second limiting groove arranged along the circumferential direction. The first limiting rib and the second limiting groove cooperate to fasten and fix the first part and the second part together.

6. A rubber tube, characterized in that, The rubber sleeve includes a rubber cap, a body, and a piston as described in any one of claims 1-5; the body extends along a first direction and has a first end and a second end disposed opposite to each other in the first direction; the rubber cap is sleeved on the first end or the second end of the body; When the piston is placed inside the body, the piston is pushed by an external force and reciprocates along the body.

7. The rubber sleeve as described in claim 6, characterized in that, When the piston's engaging portion includes a plurality of outwardly extending spring pieces and a retaining ring; the ends of the plurality of spring pieces away from the retaining ring are raised relative to the retaining ring in the first direction; and at least one guide portion protruding from the spring pieces is also provided on the outer side of the plurality of spring pieces, the guide portion extending in the second direction; The main body is provided with a plurality of guide grooves extending along a first direction; the structure of the guide grooves corresponds to the guide portion of the spring piece, so that the guide portion slides within the guide groove.

8. The rubber sleeve as described in claim 6, characterized in that, The surface of the rubber cap facing the main body is also provided with piercing teeth for piercing objects inside the main body; The two ends of the main body are also provided with a plurality of first guide portions and a plurality of first guide grooves. The plurality of first guide portions protrude from the main body and extend along the first direction. The plurality of first guide grooves are formed by the inward recess of the main body and extend along the circumferential direction of the main body. The cap is provided with a plurality of second guide grooves corresponding one-to-one with the plurality of first guide portions, and a plurality of second guide portions corresponding one-to-one with the plurality of first guide grooves; when the plurality of first guide portions cooperate with the plurality of second guide grooves, and when the plurality of first guide grooves and the plurality of second guide portions cooperate, the cap and the main body are relatively fixed in a second direction.

9. A glue gun, characterized in that, It includes a first component; the first component includes a piston as described in any one of claims 1-5, a rubber sleeve as described in any one of claims 6-8, and a flexible rubber bag.

10. The glue gun as described in claim 9, characterized in that, The flexible plastic bag is disposed in the main body of the plastic tube; the piston is disposed on the side of the flexible plastic bag away from the plastic cap, so that by sliding and squeezing the flexible plastic bag in the first direction, when the flexible plastic bag has an opening facing the plastic cap, the contents of the flexible plastic bag can flow through the opening to the plastic cap and out of the plastic cap. The flexible plastic bag also includes metal sealing rings; the metal sealing rings are fixed to both ends of the flexible plastic bag so that both ends of the flexible plastic bag contract and close; the cap is provided with a first recess and the piston is provided with a second recess for accommodating the metal sealing rings on both sides of the flexible plastic bag; The glue gun also includes a second component, which has the same structure as the first component and is arranged side by side. The flexible adhesive bag of the first component is provided with a base adhesive, and the flexible adhesive bag of the second component is provided with a hardener.

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