Piston type glue gun leakage-proof structure and hot melt glue gun

Abstract

The utility model belongs to the technical field of hot melt glue guns, and particularly relates to a piston type glue gun leakage-proof structure and a hot melt glue gun. The device comprises a shell, a resorption runner and a glue outlet runner which are sequentially connected are formed in the shell in a penetrating mode, the diameter of the glue outlet runner is larger than that of the resorption runner, and the glue outlet runner is communicated with the outside; the diameter of the piston is matched with that of the back suction flow channel; the elastic piece is arranged in the glue outlet runner, one end of the elastic piece is fixed, and the other end of the elastic piece is connected with the piston and used for pushing the piston into the back-suction runner. The hot melt glue gun is used for solving the problem that a hot melt glue gun is prone to wire drawing and glue leakage, when glue discharging is stopped, the piston is pressed back to the back-suction flow channel through the elastic force of the elastic piece, at the moment, the piston completely enters the back-suction flow channel, the internal pressure is reduced, glue in the glue discharging flow channel is sucked back through internal negative pressure, and glue leakage and wire drawing are avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hot melt glue gun technical field, concretely relates to a piston type glue gun leak -proof structure and hot melt glue gun. BACKGROUND

[0002] Hot melt glue gun is a kind of common tool for hot melt glue stick bonding, and the hot melt glue gun heats the glue stick by internal heating device, makes the glue stick change from solid state to liquid state, then extrudes liquid glue by the feeding device of glue gun, and is applied to the surface of the object to be bonded, and after glue cooling and solidification, the bonding of object can be realized.

[0003] At present, when the feeding device in the hot melt glue gun sends the melted liquid glue to the nozzle, and needs to stop feeding, usually needs to adopt leak stop device to block the internal flow channel, to place the liquid glue to continue to flow out, such as the leakproof glue gun nozzle disclosed in Chinese patent CN214289145U, wherein the leak stop bead is pressed against the outlet position of the heating body under the elastic force of the elastic member, to prevent hot melt glue from flowing out.

[0004] However, in actual use, when the trigger is loosened to stop glue discharge, due to the positive pressure in the nozzle, the pressure in the nozzle is greater than the external pressure, and the residual glue in the nozzle is still easy to flow out, causing glue leakage and stringing. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, provide a piston type glue gun leak-proof structure and hot melt glue gun, to solve the problem of easy stringing and glue leakage of hot melt glue gun.

[0006] On the one hand, the technical scheme for solving the above technical problem of the utility model is as follows: a piston type glue gun leak-proof structure, comprising:

[0007] A housing, wherein a return flow channel and a glue discharge flow channel are connected in sequence, the diameter of the glue discharge flow channel is greater than that of the return flow channel, and the glue discharge flow channel is communicated with the outside;

[0008] A piston, the diameter of the piston is matched with that of the return flow channel;

[0009] An elastic member is arranged in the glue discharge flow channel, one end of the elastic member is fixed, the other end is connected with the piston, and the elastic member is used to push the piston into the return flow channel.

[0010] Compared with the prior art, the above technical scheme has the following beneficial effects:

[0011] By matching the sliding connection of the piston in the back suction flow channel, the piston can be completely retracted into the back suction flow channel, and the glue outlet channel has a diameter larger than the back suction flow channel; when glue is discharged, the piston extends out of the back suction flow channel, and the glue in the back suction flow channel enters the glue outlet channel from the gap with the piston to realize glue discharge; when the glue discharge is stopped, the piston is pressed back into the back suction flow channel by the elastic force of the elastic member, at this time, the piston completely enters the back suction flow channel, and the volume in the glue outlet channel includes part of the volume in the back suction flow channel, so that the internal pressure becomes smaller, and the glue in the glue outlet channel is sucked back by the internal negative pressure, thereby avoiding the situation of glue leakage and stringing.

[0012] Based on the above technical solutions, the embodiments of the present application can also be improved as follows:

[0013] In an embodiment, the piston is provided with a groove at the end away from the elastic member.

[0014] The groove can increase the pushing force of the glue in the back suction flow channel on the piston, so that the piston is more easily pushed out of the back suction flow channel and into the glue outlet channel, and glue discharge is easier.

[0015] In an embodiment, the groove is a rectangular groove, a conical groove or a hemispherical groove.

[0016] In an embodiment, the distal end of the elastic member when maximally stretched does not exceed the end of the back suction flow channel away from the elastic member.

[0017] When the elastic member is maximally stretched, the piston on the elastic member can remain in the back suction flow channel.

[0018] In an embodiment, the side wall of the piston is provided with a plurality of through holes communicating with the end away from the elastic member.

[0019] The through holes in the side wall communicate with the back suction flow channel, and when the side wall of the piston is partially exposed in the glue outlet channel, the through holes in the side wall enter the glue outlet channel, so that the glue in the back suction flow channel can enter the glue outlet channel through the through holes, and at this time, the piston is partially limited in the back suction flow channel, thereby avoiding the situation that the piston cannot be accurately retracted into the back suction flow channel when the glue discharge is stopped.

[0020] In an embodiment, a plurality of limiting members are circumferentially spaced apart at the end of the back suction flow channel close to the elastic member.

[0021] In an embodiment, a telescopic rod is arranged in the elastic member, one end of the telescopic rod is fixed, and the other end is connected with the piston.

[0022] On the other hand, the present embodiment also discloses a hot melt glue gun comprising the piston type glue gun anti-leakage structure.

[0023] In an embodiment, a glue storage cavity communicating with the back suction flow channel is arranged in the shell, and a heating member is arranged outside the glue storage cavity.

[0024] In an embodiment, the shell is connected with a glue feeding assembly near one side of the back suction flow channel, and is connected with a nozzle near the other side of the glue outlet flow channel.

[0025] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0026] 1. By arranging the piston, when the trigger is released after the glue feeding work is completed, the elastic member pushes the piston to rebound into the back suction flow channel under the elastic action, when the one end of the piston is flush with the back suction flow channel, the pressure ratio between the glue outlet flow channel and the nozzle and the outside is positive pressure, when the piston enters the back suction flow channel under the elastic action, the volume of the glue outlet flow channel becomes larger and the pressure becomes smaller, so that the pressure ratio between the inside and the outside is negative pressure, part of the hot melt adhesive is sucked back, and the glue leakage and serious stringing are reduced.

[0027] 2. By arranging the through hole, the limiting member and the telescopic rod, the piston can be limited in the matched back suction flow channel, so that when the piston completely separates from the back suction flow channel and enters the glue outlet flow channel with a larger diameter, the piston cannot be accurately returned to the back suction flow channel by the elastic member.

[0028] 3. By arranging the groove at the one end of the piston away from the elastic member, the piston matched and slidingly connected in the back suction flow channel can be more easily pushed. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed in the following specific embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0031] Figure 2 It is a schematic diagram of the structure of embodiment 2 in the present application.

[0032] Figure 3 It is a schematic diagram of the structure of embodiment 3 in the present application.

[0033] Figure 4 It is a schematic diagram of the structure of embodiment 5 in the present application.

[0034] LIST OF REFERENCE NUMERALS

[0035] 1. shell; 2. back suction flow channel; 3. glue outlet flow channel; 4. piston; 5. elastic member; 6. groove; 7. through hole; 8. limiting member; 9. telescopic rod;

[0036] 10, glue storage cavity; 11, heating element; 12, glue feeding assembly; 13, nozzle. DETAILED DESCRIPTION

[0037] The technical solutions of the utility model will be described in detail below with reference to the drawings. The following examples are only used to make the technical solutions of the utility model clearer, and therefore only serve as examples, but cannot limit the protection scope of the utility model.

[0038] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the technical personnel in the field to which the utility model belongs.

[0039] In the description of the present application, it should be understood that the orientations or position relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like are based on the orientations or position relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0040] In addition, the terms "first", "second", and the like are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary technical personnel in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0042] As Figures 1-4 The utility model provides a piston 4 formula glue gun leakproof structure, it includes casing 1, piston 4 and elastic piece 5.

[0043] The shell 1 is formed with a return flow channel 2 and a glue outlet flow channel 3 connected in sequence, the glue outlet flow channel 3 has a diameter larger than the return flow channel 2, the end of the glue outlet flow channel 3 away from the return flow channel 2 is communicated with the outside, a piston 4 is slidingly connected in the return flow channel 2 and the glue outlet flow channel 3, the diameter of the piston 4 is matched with the diameter of the return flow channel 2, so that there is no gap between the piston 4 and the return flow channel 2 for the glue to pass through, and the melted glue can only push the piston 4 to move forward, an elastic member 5 is arranged in the glue outlet flow channel 3, which can be realized by a spring, one end of the elastic member 5 is fixed, and the other end is connected with the piston 4, for pushing the piston 4 into the return flow channel 2, when the glue enters the glue outlet flow channel 3 from the return flow channel 2, the glue pushes the piston 4 to compress the elastic member 5, when the glue outlet is stopped, the elastic member 5 rebounds to push the piston 4 into the return flow channel 2.

[0044] Since the diameter of the piston 4 is matched with the inner diameter of the return flow channel 2, the piston 4 can be completely retracted into the return flow channel 2, and the diameter of the glue outlet flow channel 3 is larger than that of the return flow channel 2, when the glue outlet is performed, the piston 4 is extended out of the return flow channel 2, so that the piston 4 is completely separated from the return flow channel 2, and then the glue in the return flow channel 2 enters the glue outlet flow channel 3 from the gap with the piston 4 to realize the glue outlet, when the glue outlet is stopped, the piston 4 is pressed back into the return flow channel 2 by the elastic force of the elastic member 5, at this time, the piston 4 completely enters the return flow channel 2, and the volume of the glue outlet flow channel 3 includes part of the volume of the return flow channel 2, resulting in that the internal pressure of the glue outlet flow channel 3 and the return flow channel 2 becomes smaller, since the right end of the glue outlet flow channel 3 away from the return flow channel 2 is communicated with the external glue nozzle, the glue in the glue outlet flow channel 3 and the glue nozzle can be sucked back as a whole by the internal negative pressure, avoiding the situations of glue leakage and wire drawing.

[0045] In order to improve the pushing force of the glue on the piston 4, a groove 6 is arranged at the end of the piston 4 away from the elastic member 5, the groove 6 can increase the pushing force of the glue on the piston 4 in the return flow channel 2, so that the piston 4 is more easily pushed out of the return flow channel 2 and into the glue outlet flow channel 3, and the glue outlet is easier.

[0046] Specifically, the groove 6 is a rectangular groove, a conical groove or a hemispherical groove, and the depth of the groove bottom of the groove 6 is smaller than the length of the piston 4.

[0047] Embodiment 1

[0048] In this embodiment, it needs to be further explained that, in order to ensure that the piston 4 reciprocates in the return flow channel 2 without being separated from the return flow channel 2, the extension and retraction amount of the elastic member 5 is controlled.

[0049] Specifically, as shown in Figure 1As shown, the distal end of the elastic member 5 at maximum elongation does not exceed the end of the backflow channel 2 away from the elastic member 5, by controlling the extension and contraction amount of the elastic member 5, it is ensured that the maximum elongation amount can make the piston 4 on the distal end of the elastic member 5 remain in the backflow channel 2 when the elastic member 5 is elongated to the maximum, the piston 4 does not come off the backflow channel 2, and then the piston 4 can be quickly and accurately pushed into the backflow channel 2 again when the next glue is discharged;

[0050] Secondly, the compression amount of the elastic member 5 can meet the requirement that the glue in the backflow channel 2 can push the piston 4 to compress the elastic member 5, so as to ensure that the piston 4 and the backflow channel 2 generate a gap for the glue to enter the glue discharging channel 3.

[0051] Embodiment 2

[0052] In this embodiment, on the basis of embodiment 1, it is further explained that, in order to ensure that the piston 4 can accurately return to the backflow channel 2 after leaving the backflow channel 2 and entering the glue discharging channel 3, the radial position of the piston 4 is limited by the end of the backflow channel 2 close to the elastic member 5, so as to ensure that the piston 4 can accurately retract into the backflow channel 2.

[0053] On the one hand, as shown in the drawings, Figure 2 As shown, the side wall of the piston 4 is provided with a plurality of through holes 7 communicating with the end away from the elastic member 5, and the through holes 7 are circumferentially spaced apart.

[0054] When the side wall of the piston 4 is exposed in the glue discharging channel 3, the through holes 7 in the side wall enter the glue discharging channel 3, and the glue in the backflow channel 2 can enter the glue discharging channel 3 through the through holes 7, at this time, the piston 4 is partially limited in the backflow channel 2, so as to avoid that the piston 4 cannot accurately retract into the backflow channel 2 when the glue discharging is stopped.

[0055] On the other hand, on the basis of the through holes 7 in the piston 4, the end of the piston 4 away from the elastic member 5 is further provided with the groove 6 as described above, the through hole 7 is located at the bottom of the groove 6 and communicates with the side wall of the piston 4, which can achieve a good pushing effect while keeping the piston 4 limited by the backflow channel 2 due to the through hole 7.

[0056] Embodiment 3

[0057] In this embodiment, different from embodiment 2, as shown in the drawings, Figure 3As shown, the back suction flow channel 2 is provided with a plurality of limiting members 8 at one end of the elastic member 5 in a circumferential interval, which ensures that the piston 4 can re-enter the back suction flow channel 2 accurately after being separated from the back suction flow channel 2. The limiting member 8 can be a rod-shaped member and is attached to the side wall of the piston 4. The gap between the limiting members 8 allows the adhesive in the back suction flow channel 2 to overflow, and the limiting member 8 limits the piston 4, so that when the elastic member 5 pushes the piston 4 to retract into the back suction flow channel 2, the piston 4 can enter the back suction flow channel 2 accurately.

[0058] Embodiment 4

[0059] In this embodiment, different from Embodiments 2 and 3, on the basis of Embodiments 2 and 3, a limiting member 8 can be arranged at one end of the back suction flow channel 2 close to the elastic member 5, and a through hole 7 is arranged on the piston 4 and penetrates the side wall of the piston 4 and the end of the piston 4 away from the elastic member 5, so as to ensure that the adhesive enters the glue outlet flow channel 3 more smoothly.

[0060] Embodiment 5

[0061] In this embodiment, different from Embodiments 2 and 3, as shown in Figure 4 A telescopic rod 9 is arranged in the elastic member 5, one end of the telescopic rod 9 is fixed, and the other end is connected with the piston 4. The telescopic rod 9 plays a guiding role and controls the radial deviation of the piston 4 within a proper range, so as to ensure that the piston 4 can enter the back suction flow channel 2 accurately after being separated from the back suction flow channel 2.

[0062] Embodiment 6

[0063] As shown in Figures 1-4 This embodiment also discloses a hot melt glue gun, which comprises the piston 4 type glue gun leakage prevention structure.

[0064] Specifically, the shell 1 is provided with a glue storage cavity 10 which is in communication with the back suction flow channel 2. A heating member 11 is arranged outside the glue storage cavity 10, which can gradually melt the front end of the glue stick in the glue storage cavity 10.

[0065] The shell 1 is connected with a glue inlet assembly 12 close to the back suction flow channel 2. The shell 1 is connected with a nozzle 13 close to the glue outlet flow channel 3. The nozzle 13 and the glue inlet assembly 12 located at the two ends of the piston 4 type glue gun leakage prevention structure can respectively play the roles of glue outlet and glue inlet.

[0066] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A leak-proof structure for a piston-type glue gun, characterized in that, include: A shell having a sequentially connected back suction channel and an adhesive outlet channel, wherein the diameter of the adhesive outlet channel is larger than that of the back suction channel, and the adhesive outlet channel is connected to the outside. A piston, the diameter of which is adapted to the diameter of the back suction channel; An elastic element is disposed in the dispensing channel. One end of the elastic element is fixed, and the other end is connected to the piston, which is used to push the piston into the suction channel.

2. The anti-leakage structure for a piston-type glue gun according to claim 1, characterized in that, The piston has a groove at the end away from the elastic element.

3. The anti-leakage structure for a piston-type glue gun according to claim 2, characterized in that, The groove is a rectangular groove, a conical groove, or a hemispherical groove.

4. The anti-leakage structure for a piston-type glue gun according to claim 1, characterized in that, The distal end of the elastic element at its maximum elongation does not exceed the end of the backflow channel that is furthest from the elastic element.

5. The anti-leakage structure for a piston-type glue gun according to claim 1 or 2, characterized in that, The piston has several through holes on its sidewalls that connect to the end away from the elastic element.

6. The anti-leakage structure for a piston-type glue gun according to claim 1, characterized in that, The suction channel is provided with several limiting members at circumferential intervals near one end of the elastic member.

7. The anti-leakage structure for a piston-type glue gun according to claim 1, characterized in that, A telescopic rod is inserted through the elastic element, with one end of the telescopic rod fixed and the other end connected to the piston.

8. A hot melt glue gun, characterized in that, Including the piston-type glue gun leak-proof structure as described in any one of claims 1-7.

9. The hot melt glue gun according to claim 8, characterized in that, The housing is provided with a glue storage cavity that communicates with the back suction channel, and a heating element is provided on the outside of the glue storage cavity.

10. The hot melt glue gun according to claim 8, characterized in that, The housing is connected to a glue inlet assembly on the side near the back suction channel, and a nozzle is connected to the side of the housing near the glue outlet channel.

Images