Flow limiting assembly, flow limiting valve, flow limiting coating lip and hot melt glue gun capable of limiting flow

Abstract

The utility model discloses a current-limiting assembly, a current-limiting valve, a current-limiting coating lip and a hot melt glue gun capable of limiting current, the current-limiting assembly is used for adjusting the glue liquid fluid and the glue outlet amount of an adhesive, and the current-limiting assembly comprises a limiting piece and an adjusting piece. The limiting piece is provided with a limiting groove; the adjusting part comprises a movable part and a shielding part which are connected with each other, the movable part and the limiting part are arranged at an interval and jointly define a glue guide channel, the glue guide channel is suitable for corresponding to the glue outlet, and the shielding part is arranged in the limiting groove; the movable part drives the shielding part to move relative to the limiting part so as to be switched between a first position and a second position, and at the first position, the shielding part retreats from the glue guide channel and avoids the glue fluid and the adhesive; at the second position, at least part of the shielding part corresponds to the adhesive guiding channel, and part of the adhesive liquid fluid and the adhesive are prevented from flowing. According to the flow limiting assembly, the operation mode of adjusting the glue outlet amount can be simplified, and the service life of parts can be prolonged. The flow-limiting valve with the flow-limiting assembly, the flow-limiting coating lip and the hot melt glue gun capable of limiting the flow also have the advantages.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of glue injection, especially relates to a current -limiting assembly, current -limiting valve, current -limiting coating lip and current -limiting hot melt glue gun. BACKGROUND

[0002] During the glue injection process, different glue injection samples need to be faced with the glue injection amount of glue outlet corresponding adjustment. In the related art, different valve bodies are often replaced to realize the control of the glue injection amount of the glue outlet. But the operation of the adjustment mode is more cumbersome, and frequent disassembly and replacement can cause the connection between the valve body and the hot melt glue gun to be loose, reducing the service life of the components. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. Therefore, the utility model provides a current -limiting assembly, which can simplify the operation mode of adjusting the glue injection amount and prolong the service life of the components.

[0004] The utility model further provides a current -limiting valve with the current -limiting assembly.

[0005] The utility model further provides a current -limiting coating lip with the current -limiting assembly.

[0006] The utility model further provides a current -limiting hot melt glue gun with the current -limiting assembly.

[0007] The current -limiting assembly according to the first aspect embodiment of the utility model is used to adjust the glue injection amount of glue fluid and adhesive, and the current -limiting assembly comprises a limiting piece and an adjusting piece.

[0008] The outer wall of the limiting piece has a limiting groove;The adjusting piece comprises a movable part and a shielding part connected, the movable part is arranged at intervals with the limiting piece, and the movable part and the limiting piece jointly define a glue guide channel, the glue guide channel is suitable for corresponding glue outlet, and the shielding part is arranged in the limiting groove;

[0009] The movable part can drive the shielding part to move relative to the limiting piece, so that the shielding part switches between the first position and the second position, in the first position, the shielding part exits the glue guide channel to avoid the glue fluid and the adhesive, in the second position, at least part of the shielding part corresponds with the glue guide channel to hinder part of the glue fluid and the adhesive to flow.

[0010] The glue outlet and the glue guiding channel of the glue liquid and the adhesive correspond to each other, the glue liquid and the adhesive can flow out through the glue outlet and the glue guiding channel to perform glue injection.

[0011] According to some embodiments of the utility model, the limiting groove has oppositely arranged first and second abutting surfaces, and the shielding part is arranged between the first and second abutting surfaces, in the first position, the shielding part abuts against the first abutting surface, and in the second position, the shielding part is arranged in a spaced manner between the first and second abutting surfaces.

[0012] According to some embodiments of the utility model, the shielding part further has a third position, in the third position, the shielding part abuts against the second abutting surface, and the shielding part closes the glue guiding channel to limit the flow of the glue liquid and the adhesive.

[0013] According to some embodiments of the utility model, the first and second abutting surfaces are inclined surfaces.

[0014] According to some embodiments of the utility model, the flow limiting assembly further comprises a fastener, the fastener is connected to the side of the movable part away from the shielding part, and the fastener is used to limit the movement of the movable part to keep the shielding part in the current position.

[0015] According to some embodiments of the utility model, the side of the movable part away from the shielding part has a groove, the groove is used to drive the movement of the movable part, and the groove moves together with the movable part.

[0016] The flow limiting valve according to the second aspect of the embodiments of the utility model comprises a valve body and the flow limiting assembly described in any of the above embodiments.

[0017] The valve body defines a glue injection cavity, the glue injection cavity is communicated with the valve body and forms a separated glue inlet and glue outlet, the glue inlet is suitable for inputting glue fluid and adhesive into the glue injection cavity; the limiting member and the adjusting member of the flow limiting assembly are connected to the valve body, the glue guide channel is communicated with the glue outlet, and the shielding part moves relative to the valve body to adjust the glue output of the glue outlet.

[0018] The flow limiting valve has at least the following beneficial effects: the shielding part moves relative to the valve body to change the glue guide area of the glue guide channel, thereby adjusting the glue output of the glue fluid and the adhesive, and reducing the disassembly of components to prolong the service life of the components.

[0019] The flow limiting lip according to the third aspect of the present application comprises a lip body and the flow limiting assembly described in any of the above embodiments.

[0020] The lip body defines a coating channel, the coating channel is communicated with the lip body and forms a separated glue injection port and coating port; the limiting member and the adjusting member of the flow limiting assembly are connected to the lip body, the glue guide channel is communicated with the glue injection port, and the shielding part moves relative to the lip body to adjust the glue output of the coating port.

[0021] The flow limiting lip has at least the following beneficial effects: the shielding part moves relative to the lip body to change the glue guide area of the glue guide channel, thereby adjusting the glue output of the glue fluid and the adhesive, and reducing the disassembly of components to prolong the service life of the components.

[0022] The flow limiting hot melt glue gun according to the fourth aspect of the present application comprises a gun body, a valve body, a flow limiting assembly described in any of the above embodiments and a lip body.

[0023] The gun body defines a connected glue inlet channel and glue outlet channel, the glue inlet channel is used for inputting glue fluid and adhesive; the valve comprises a valve body, the valve body is connected to the gun body, the valve body defines a glue injection cavity, the glue injection cavity is communicated with the valve body and forms a separated glue inlet and glue outlet, the glue inlet is communicated with the glue outlet channel;

[0024] The lip comprises a front lip body and a rear lip body connected, a glue path shunt is arranged between the front lip body and the rear lip body, the front lip body and the rear lip body define a coating channel, one end of the coating channel is a glue injection port, and the other end is a coating port, the glue injection port is communicated with the glue outlet, the glue path shunt is arranged in the coating channel and is used for defining a glue output area of the coating port, and the coating port is used for outputting glue fluid and adhesive;

[0025] The valve is connected with the flow limiting assembly, the limiting piece and the adjusting piece are connected to the valve body, the glue guide channel is communicated with the glue outlet, the shielding part moves relative to the valve body to adjust the glue output of the glue outlet, and / or the coating lip is connected with the flow limiting assembly, the limiting piece and the adjusting piece are connected to the coating lip, the glue guide channel is communicated with the glue injection port, and the shielding part moves relative to the coating lip to adjust the glue output of the glue injection port.

[0026] The flow limiting hot melt glue gun has at least the following beneficial effects: the glue guide area of the glue guide channel is changed by the movement of the shielding part relative to the gun body, the flow of the glue liquid and the adhesive introduced from the glue outlet into the glue injection port is controlled, the glue output of the glue liquid and the adhesive is adjusted, the operation mode of adjusting the glue output is simplified, and the disassembly of components is reduced to prolong the service life of the components.

[0027] According to some embodiments of the utility model, the gun body further defines a backflow channel, the backflow channel is communicated with the glue inlet channel and the glue outlet channel, the flow limiting hot melt glue gun further comprises a safety valve, the safety valve is connected to the gun body and is used for switching the on-off of the backflow channel and the glue outlet channel, and the safety valve is configured to turn on the backflow channel when the pressure in the glue outlet channel is greater than a preset value.

[0028] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0029] The utility model will be further explained in combination with the drawings and examples, wherein:

[0030] Figure 1 It is the schematic diagram of flow limiting assembly in the utility model embodiment;

[0031] Figure 2 It is the explosion drawing of flow limiting assembly in the utility model embodiment;

[0032] Figure 3 It is the schematic diagram of limiting piece in the utility model embodiment;

[0033] Figure 4 It is the schematic diagram of flow limiting valve in the utility model embodiment;

[0034] Figure 5 It is the schematic diagram of flow limiting coating lip in the utility model embodiment;

[0035] Figure 6 It is the schematic diagram of flow limiting hot melt glue gun in the utility model embodiment;

[0036] Figure 7 It is a schematic view of the hot melt glue gun with flow limitation in the embodiment of the utility model;

[0037] Figure 8 It is a schematic view of the gun body in the embodiment of the utility model;

[0038] Figure 9 It is a schematic view of the safety valve in the embodiment of the utility model.

[0039] Reference signs:

[0040] The hot melt glue gun with flow limitation 10;

[0041] The flow limitation assembly 100;The limiting piece 110;The limiting groove 111;The first abutting surface 1111;The second abutting surface 1112;The adjusting piece 120;The movable part 121;The glue guide channel 1211;The recess 1212;The shielding part 122;The fastener 130;

[0042] The flow limitation valve 200;The valve body 210;The glue injection cavity 211;The glue inlet 2111;The glue outlet 2112;

[0043] The flow limitation lip coating 300;The lip body 310;The coating channel 311;The glue injection port 3111;The coating port 3112;The front lip body 320;The rear lip body 330;The glue path shunt piece 340;

[0044] The gun body 400;The glue inlet channel 410;The glue outlet channel 420;The backflow channel 430;The first chamber 440;The second chamber 450;The third chamber 460;

[0045] The safety valve 500;The valve body 510;The liquid inlet 511;The backflow hole 512;The valve seat 513;The valve port 514;The adjusting rod 520;The spring 530;The valve core rod 540;The ball 550;The adjusting nut 560;

[0046] The gear pump 600;The servo motor 610;

[0047] The filter assembly 700. DETAILED DESCRIPTION

[0048] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0049] In the description of the utility model, it is understood that the direction description, such as the direction or position relation of up, down, front, back, left, right and the like indicated is the direction or position relation based on the drawing shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.

[0050] In the description of the utility model, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.If the first, second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0051] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0052] In the description of the utility model, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The flow limiting assembly of the first aspect embodiment, the flow limiting valve of the second aspect embodiment, the flow limiting coating lip of the third aspect embodiment and the flow limiting hot melt glue gun of the fourth aspect embodiment of the utility model will be described below with reference to the accompanying drawings of the specification.

[0054] The utility model embodiment provides a kind of flow limiting assembly 100 for adjusting the glue liquid fluid and the glue output of adhesive, refer to Figure 1 And Figure 2As shown, the flow limiting assembly 100 comprises a limiting member 110 and an adjusting member 120, wherein the outer wall of the limiting member 110 is recessed to form a limiting groove 111. The adjusting member 120 comprises a movable part 121 and a shielding part 122, the movable part 121 is connected with the shielding part 122, the shielding part 122 is connected to one side of the movable part 121 facing the limiting member 110, and the shielding part 122 is connected to the limiting groove 111 of the limiting member 110, while the movable part 121 is arranged spaced apart from the limiting member 110, and the two together define a glue guiding channel 1211.

[0055] Since the flow limiting assembly 100 is used to adjust the glue output of the glue fluid and adhesive, in actual application, the flow limiting assembly 100 will cooperate with the glue injection coating device such as valve, coating lip, etc. to perform glue injection operation. The glue guiding channel 1211 corresponds to the glue outlet position or the glue inlet position of the glue injection coating device, so that the glue fluid and adhesive can enter the glue guiding channel 1211 from the glue outlet position for glue injection, or enter the glue inlet position from the glue guiding channel 1211 for glue injection. Further, the movable part 121 can move relative to the limiting member 110 and drive the shielding part 122 to move relative to the limiting member 110, so as to switch the shielding part 122 between the first position and the second position.

[0056] Specifically, in use, the limiting member 110 serves as a fixed reference point, the limiting member 110 is fixedly connected to the glue injection coating device such as valve or coating lip, and the movable part 121 of the adjusting member 120 can rotate along a predetermined path to change the position of the shielding part 122. The glue guiding channel 1211 is the gap between the limiting member 110 and the movable part 121, the glue guiding channel 1211 corresponds to the glue outlet position or the glue inlet position, and the glue guiding channel 1211 is responsible for guiding the flow of glue fluid and adhesive. When the shielding part 122 is in the first position, the shielding part 122 will exit the glue guiding channel 1211 to provide an unobstructed flow channel for the flow of glue fluid and adhesive, at this time the glue fluid and adhesive can flow smoothly through the glue outlet position. On the contrary, when the shielding part 122 switches to the second position, at least part of the shielding part 122 will enter the glue guiding channel 1211, hindering the flow of part of the glue fluid and adhesive, thereby achieving control of the glue output of the glue fluid and adhesive. Thus, by switching the shielding part 122 between the first position and the second position, when the flow limiting assembly 100 is connected to the glue injection coating device such as valve or coating lip, the glue output of the glue fluid and adhesive can be directly controlled on the glue injection coating device such as valve or coating lip, without the need to frequently disassemble and replace different glue injection coating devices such as valves or coating lips to control the glue output of the glue fluid and adhesive, thereby prolonging the service life of the components of the coating device and improving the precision and efficiency of the coating operation.

[0057] The glue liquid fluid and the adhesive can flow out through the glue outlet position and the glue guide channel 1211 to perform glue injection. During the glue injection process, the movable part 121 is driven to move to drive the shielding part 122 to move relative to the limiting part 110, so that the shielding part 122 adjusts the glue injection amount. When in the first position, the shielding part 122 is away from the glue guide channel 1211, and the glue liquid fluid and the adhesive can flow from the glue outlet position to the glue guide channel 1211 to perform glue injection, and at this time, the current-limiting assembly 100 is in a fully open state. When in the second position, part of the shielding part 122 corresponds to the glue guide channel 1211, and when the glue liquid fluid and the adhesive flow from the glue outlet position to the glue guide channel 1211, the shielding part 122 hinders the flow of part of the glue liquid fluid and the adhesive to reduce the glue injection amount of the glue liquid fluid and the adhesive, and at this time, the current-limiting assembly 100 is in a half-open state. Therefore, the movement of the shielding part 122 can adjust the flow of the glue liquid fluid and the adhesive, simplify the operation mode of adjusting the glue injection amount, and prolong the service life of the parts.

[0058] In some embodiments, referring to Figures 1 to 3 As shown, the limiting groove 111 has a first abutting surface 1111 and a second abutting surface 1112 arranged oppositely in the inside, and the first abutting surface 1111 and the second abutting surface 1112 constitute the boundary of the activity range of the shielding part 122. The shielding part 122 is located between the two abutting surfaces and can be switched between the first position and the second position.

[0059] Specifically, when in the first position, the shielding part 122 abuts against the first abutting surface 1111, at this time, the shielding part 122 completely avoids the glue guide channel 1211, and the glue liquid fluid and the adhesive can flow freely. When in the second position, the shielding part 122 is arranged at intervals between the first abutting surface 1111 and the second abutting surface 1112, and the shielding part 122 does not contact the first abutting surface 1111 or the second abutting surface 1112, at this time, part of the shielding part 122 enters the glue guide channel 1211, which plays a role in hindering the flow of part of the glue liquid fluid and the adhesive. Since the movement of the shielding part 122 from one position to another position depends on external driving force (such as a manual knob, a pneumatic actuator, etc.), these external driving forces act on the movable part 121, and then drive the shielding part 122 to move along the track in the limiting groove 111, so as to realize the position transformation of the shielding part 122. Therefore, by arranging the first abutting surface 1111 and the second abutting surface 1112, the shielding part 122 is always located between the first abutting surface 1111 and the second abutting surface 1112, which can limit the movement of the shielding part 122 and has a definite activity range, so as to ensure that the current-limiting assembly 100 can accurately control the glue injection amount of the glue liquid fluid and the adhesive, thereby making each adjustment of the shielding part 122 achieve the expected glue injection effect.

[0060] In some embodiments, referring to Figures 1 to 3 As shown, in addition to being able to switch between the first position and the second position, the shielding portion 122 also has a third position. When the shielding portion 122 is in the third position, the outer wall of the shielding portion 122 abuts against the second abutting surface 1112 in the limiting groove 111, at this time, the shielding portion 122 completely closes the glue guide channel 1211, thereby completely preventing the flow of glue fluid and adhesive. By providing the third position of the shielding portion 122, the flow limiting assembly 100 can be further provided with additional safety protection. In the non-working state of the flow limiting assembly 100 or during maintenance, the shielding portion 122 can be set to the third position, thereby ensuring that there is no glue fluid and adhesive flowing out of the flow limiting assembly 100, thereby improving work efficiency and ensuring operation safety.

[0061] Specifically, the process of moving the shielding portion 122 from the first position to the second position is a process of gradually increasing the obstruction of the shielding portion 122 to the glue guide channel 1211; and further moving from the second position to the third position realizes the complete closure of the glue guide channel 1211. In the third position, through the close contact between the shielding portion 122 and the second abutting surface 1112, an effective shielding barrier can be established around the glue guide channel 1211, thereby blocking the possible leakage path of the glue fluid and the adhesive. In this embodiment, by making the shielding portion 122 have multiple positions, not only the flexibility of the flow control of the glue fluid and the adhesive is improved, allowing the user to select different glue discharge modes and achieve precise adjustment of the glue fluid and adhesive discharge amount according to actual needs, but also the glue fluid and adhesive flow path can be quickly cut off in the case of not needing glue discharge, preventing accidental leakage or overflow.

[0062] In some embodiments, referring to Figure 3As shown, the first abutting surface 1111 and the second abutting surface 1112 are designed as inclined surfaces. Specifically, when the shielding part 122 is in the first position, the shielding part 122 will abut against the first abutting surface 1111; when in the second position, the shielding part 122 is arranged between the first abutting surface 1111 and the second abutting surface 1112; and when in the third position, the shielding part 122 will abut against the second abutting surface 1112. Since the shielding part 122 needs to contact the first abutting surface 1111 and the second abutting surface 1112 respectively when in the first position and the third position, the inclined surface design of the first abutting surface 1111 and the second abutting surface 1112 can help guide the shielding part 122 to gradually adhere to the abutting surface, ensuring that the shielding part 122 can form close contact with the limiting groove 111 when switched to the first position and the third position, thereby effectively preventing the leakage of glue fluid and adhesive. Moreover, the inclined surface design can generate a gradual pressure distribution when the shielding part 122 approaches the abutting surface, so even if there is a slight manufacturing tolerance or surface unevenness, it can be compensated by elastic deformation, thereby improving the sealing performance of the shielding part 122 and the limiting groove 111, and ensuring that the flow limiting assembly 100 has good sealing effect. At the same time, the inclined surface design of the first abutting surface 1111 and the second abutting surface 1112 can reduce the friction between the abutting surface and the shielding part 122 when the shielding part 122 approaches the abutting surface, thereby reducing the wear of the limiting part 110 and the adjusting part 120, and prolonging the service life of the components.

[0063] In some embodiments, referring to Figure 1 and Figure 2As shown, the flow limiting assembly 100 comprises a fastener 130 connected to the side of the movable part 121 away from the shielding part 122. The main function of the fastener 130 is to limit the movement of the movable part 121, so as to ensure that the shielding part 122 can be stably kept in its current position, whether it is the first position, the second position or the third position. Specifically, when the user adjusts the position of the shielding part 122, the movable part 121 can be fixed by tightening the fastener 130, so as to prevent the movable part 121 and the shielding part 122 from being displaced unnecessarily due to external vibration or other factors. In this embodiment, the outer wall surface of the movable part 121 is provided with external threads, and the fastener 130 is connected to the movable part 121 by threaded connection, so that the fastening and loosening are very convenient. Since the flow limiting assembly 100 is used to adjust the amount of adhesive and adhesive fluid, the flow limiting assembly 100 is generally used in cooperation with the valve and the coating lip and other adhesive dispensing assemblies. When the flow limiting assembly 100 is connected to the valve or the coating lip, the shielding part 122 needs to be adjusted to the specified position to make the adhesive and adhesive fluid reach the preset dispensing amount during adhesive injection. After adjusting the shielding part 122, the fastener 130 is rotated relative to the movable part 121 to press the movable part 121 and abut against the outer wall of the valve or the coating lip, so as to prevent the movable part 121 and the shielding part 122 from being displaced unnecessarily due to external vibration or other factors, which causes the position of the shielding part 122 to change and affects the adhesive injection and coating of the adhesive and adhesive fluid. The embodiment can enhance the operation flexibility and precision of the flow limiting assembly 100 by the fastener 130, so as to effectively avoid the displacement of the shielding part 122 due to accidental collision or environmental change, and ensure that the dispensing amount of the adhesive and adhesive fluid meets the expected setting each time.

[0064] In other embodiments, the fastener 130 and the movable part 121 can also be connected and fixed by the way of bolt. For example, the side wall of the movable part 121 is provided with a plurality of through holes, and the fastener 130 has a bolt structure. When the movable part 121 is connected to the valve or the coating lip, the bolt structure of the fastener 130 is inserted into one of the plurality of through holes, and the fastener 130 is connected and fixed to the valve or the coating lip. Since the movement of the movable part 121 is relative to the valve or the coating lip to change the shielding area of the adhesive dispensing position, when the bolt structure is inserted into the through hole, the fastener 130 will limit the movement of the movable part 121 to hinder the movement of the movable part 121, so as to avoid the change of the position of the shielding part 122 and affect the adhesive injection and coating effect. In another embodiment, the fastener 130 and the movable part 121 can also be connected and fixed by magnetic attraction connection, buckle connection or ratchet mechanism.

[0065] In some embodiments, referring to Figures 1 to 3As shown, one end of the movable part 121 is connected to the shielding part 122, and the other end is opposite to the shielding part 122. The movable part 121 is provided with a groove 1212 on the side away from the shielding part 122, and the groove 1212 is recessed towards the shielding part 122. The groove 1212 can drive the movable part 121 to move, and the groove 1212 moves with the movable part 121 during the movement of the movable part 121. Specifically, in this embodiment, the movable part 121 switches the shielding part 122 between the first position and the second position by rotating, and the groove 1212 can facilitate the user to rotate the movable part 121, thereby improving the activity efficiency of the movable part 121. In the embodiment in which the flow limiting assembly 100 comprises the fastener 130, after the shielding part 122 is rotated to the specified position, the fastener 130 needs to be connected to the movable part 121 and abut against the valve or the lipstick fixed to the movable part 121. Therefore, the groove 1212 can temporarily position the movable part 121 and the shielding part 122, for example, fix the additional tool in the groove 1212, so that the friction between the fastener 130 and the movable part 121 does not drive the movable part 121 and the shielding part 122 to move and change the position of the shielding part 122 when the fastener 130 is connected to the movable part 121.

[0066] Meanwhile, since the shielding part 122 has multiple position states, the position and the inclined angle of the groove 1212 can determine the glue output of the glue channel 1211. For example, in one example, referring to Figure 1 As shown, the shielding part 122 is in the first position, abuts against the first abutting surface 1111, and the position of the groove 1212 is vertically placed. Figure 1 In the embodiment, when the shielding part 122 is switched from the first position to the second position, the groove 1212 rotates along the clockwise direction with the movable part 121, and the position of the groove 1212 is inclined. At this time, the shielding part 122 is in the second position and blocks the glue fluid and the adhesive of the glue channel 1211.

[0067] The groove 1212 of this embodiment drives the movable part 121 to move along the preset path, provides a simple and effective way to change the position of the shielding part 122 relative to the glue channel 1211, and further adjusts the glue output of the glue fluid and the adhesive. In addition, the position of the shielding part 122 can be determined according to the position of the groove 1212, so that the shielding part 122 can be switched to the corresponding position in the limiting groove 111, thereby improving the switching efficiency of the shielding part 122.

[0068] The utility model embodiment further provides a flow limiting valve 200, referring to Figures 1 to 4As shown, the flow limiting valve 200 comprises a valve body 210 and the flow limiting assembly 100 described in any of the above embodiments, wherein the inside of the valve body 210 defines a glue injection cavity 211, and the glue injection cavity 211 is formed with a glue inlet 2111 and a glue outlet 2112 on the outer wall of the valve body 210, and the glue inlet 2111 and the glue outlet 2112 are arranged separately. The glue inlet 2111 is used for inputting glue fluid and adhesive into the glue injection cavity 211, and the glue injection cavity 211 is used for storing glue fluid and adhesive to be dispensed and realizing the output of glue fluid and adhesive.

[0069] The limiting part 110 and the adjusting part 120 of the flow limiting assembly 100 are connected to the valve body 210. In this embodiment, the glue guide channel 1211 between the limiting part 110 and the adjusting part 120 corresponds to the glue outlet 2112 in the vertical direction, and the glue guide channel 1211 and the glue outlet 2112 are communicated, so that the glue fluid and the adhesive can flow out through the glue outlet 2112 and the glue guide channel 1211, realizing the dispensing of the glue fluid and the adhesive. Moreover, the shielding part 122 can move relative to the valve body 210 to change the glue output of the glue outlet 2112.

[0070] In this embodiment, the limiting part 110 is connected and fixed to the valve body 210. The adjusting part 120 is connected to the valve body 210 and the limiting groove 111 of the limiting part 110, the shielding part 122 is moved to the required glue dispensing position by rotating the movable part 121, then the movable part 121 is connected to the fastener 130, and the fastener 130 abuts against the valve body 210, thereby limiting the movement of the movable part 121 and the shielding part 122, and the shielding part 122 is kept at the current glue dispensing position to perform glue injection operation. When the glue output needs to be controlled, the operator can loosen the fastener 130, drive the movable part 121 by a manual or automatic control system, thereby driving the shielding part 122 to switch between the first position and the second position. When the shielding part 122 is in the first position, the shielding part 122 exits the glue guide channel 1211, so that the glue fluid and the adhesive can flow out smoothly through the glue outlet 2112 and the glue guide channel 1211. When the shielding part 122 is in the second position, the shielding part 122 is at least partially located in the glue guide channel 1211 and corresponds to the glue outlet 2112, and part of the glue fluid and the adhesive is hindered to flow, thereby reducing the glue output of the glue fluid and the adhesive. The embodiment can accurately adjust the amount of glue dispensing each time according to actual needs by the movement of the shielding part 122, and improves the accuracy and efficiency of glue injection operation.

[0071] The flow limiting valve 200 of the embodiment of the utility model moves the shielding part 122 relative to the valve body 210, changes the glue guide area of the glue guide channel 1211, thereby realizing the adjustment of the glue output of the glue fluid and the adhesive, and reducing the disassembly and replacement of the components of the flow limiting valve 200, thereby prolonging the service life of the components.

[0072] The utility model embodiment further provides a flow limiting lip 300, referring to Figures 1 to 3 , and Figure 5 The flow limiting lip 300 includes a lip body 310 and the flow limiting assembly 100 described in any of the above embodiments, wherein the inside of the lip body 310 defines a coating channel 311, and the coating channel 311 leads through the outer wall of the lip body 310 to form a separated glue injection port 3111 and a coating port 3112. The glue injection port 3111 is used to introduce glue fluid and adhesive into the coating channel 311, and then uniformly distribute them onto the target surface through the coating port 3112. The limiting member 110 and the adjusting member 120 of the flow limiting assembly 100 are connected to the lip body 310, the glue guide channel 1211 is communicated with the glue injection port 3111, and the shielding part 122 moves relative to the lip body 310 to adjust the glue output of the coating port 3112.

[0073] In this embodiment, the flow limiting lip 300 controls the glue output by changing the position of the shielding part 122. When the shielding part 122 is in the first position, the glue guide channel 1211 is fully opened, ensuring that the glue fluid and adhesive flow meet the coating requirements. When the shielding part 122 is in the second position, it blocks part of the glue fluid and adhesive flow, limiting the glue output. Thus, the glue fluid and adhesive output is controlled and adjusted by the position conversion of the shielding part 122.

[0074] The flow limiting lip 300 of the utility model embodiment moves the shielding part 122 relative to the lip body 310, changes the glue guide area of the glue guide channel 1211, thereby adjusting the glue output of the glue fluid and adhesive, and reducing the disassembly and replacement of the components of the flow limiting lip 300 to prolong the service life of the components.

[0075] The utility model embodiment further provides a flow limiting hot melt glue gun 10, referring to Figures 1 to 7 The flow limiting hot melt glue gun 10 includes a gun body 400, a valve, a coating lip, and the flow limiting assembly 100 described in any of the above embodiments. The valve has a valve body 210. The inside of the gun body 400 defines a glue inlet channel 410 and a glue outlet channel 420 in communication, wherein the glue inlet channel 410 is used to introduce glue fluid and adhesive into the gun body 400. The inside of the valve body 210 defines a glue injection cavity 211, and the glue injection cavity 211 leads through the outer wall of the valve body 210 to form a separated glue inlet port 2111 and a glue outlet port 2112. The glue inlet port 2111 is communicated to the glue outlet channel 420 to receive glue fluid and adhesive from the gun body 400. After the glue fluid and adhesive enter the valve body 210, they are accommodated in the glue injection cavity 211. The glue outlet port 2112 can be selectively opened or closed to control the flow of glue fluid and adhesive in the glue injection cavity 211.

[0076] The glue guide channel 1211 is connected to the glue outlet 2112. When the glue outlet 2112 is opened, the glue fluid and adhesive can flow into the glue guide channel 1211. The shielding part 122 can rotate relative to the valve body 210 to switch between the first position (fully avoiding the glue fluid and adhesive), the second position (partially blocking the glue fluid and adhesive), and the third position (blocking the glue guide channel 1211), thereby achieving precise control of the glue output. The glue fluid and adhesive can be accurately transmitted to the subsequent part after being regulated by the flow limiting assembly 100.

[0077] The coating lip includes a front lip body 320 and a rear lip body 330 connected to each other and arranged downstream of the valve body 210. A glue path shunt plate 340 is arranged between the front lip body 320 and the rear lip body 330, and the interiors of the front lip body 320 and the rear lip body 330 jointly define a coating channel 311 in which the glue path shunt plate 340 is arranged. One end of the coating channel 311 is a glue inlet 3111, and the other end is a coating outlet 3112, which is arranged separately from the glue inlet 3111. The glue inlet 3111 is used to guide the glue fluid and adhesive into the coating channel 311, and the coating outlet 3112 is used to output the glue fluid and adhesive. The glue inlet 3111 is connected to the glue guide channel 1211, and the glue fluid and adhesive enter the coating channel 311 through the glue inlet 3111. The glue fluid and adhesive pass through the glue path shunt plate 340 in the coating channel 311, and the glue path shunt plate 340 shunts the glue fluid and adhesive, so that the coating outlet 3112 specifically outputs the glue fluid and adhesive from different glue output areas, so as to perform the glue injection and coating work of the flow-limiting hot melt glue gun 10.

[0078] Specifically, in this embodiment, the glue inlet 3111 is arranged on the side of the front lip body 320 facing the valve body 210, and the coating channel 311 forms the coating outlet 3112 at the end position of the front lip body 320 and the rear lip body 330 away from the valve body 210. In other embodiments, the glue inlet 3111 can also be arranged on the rear lip body 330, or at the end position of the front lip body 320 and the rear lip body 330 facing the valve body 210. The coating outlet 3112 can also be formed on the front lip body 320 or the rear lip body 330. As long as the glue fluid and adhesive can be guided out of the coating lip through the glue inlet 3111, the coating channel 311, and the coating outlet 3112.

[0079] The glue path shunt piece 340 is detachably arranged between the front lip body 320 and the rear lip body 330, and the two sides of the glue path shunt piece 340 are respectively attached to the wall surfaces of the front lip body 320 and the rear lip body 330. Among them, the glue path shunt piece 340 is provided with at least two notches. Among them, the glue fluid and the adhesive can enter the glue path of the coating channel 311 from the glue injection port 3111, and then flow out from the communication port of the front lip body 320 and pass through the glue path shunt piece 340. When the glue fluid and the adhesive pass through the glue path shunt piece 340, the glue fluid and the adhesive will be limited to be conducted from the notches of the glue path shunt piece 340, so as to define the glue outlet area of the coating port 3112, so as to realize the shunt of the glue fluid and the adhesive, and then the glue fluid and the adhesive will be shunted and conducted out of the coating port 3112, so as to be able to coat the object surface with the glue fluid and the adhesive, and realize coating multiple places on the object surface.

[0080] In the above embodiment, the thickness of the glue path shunt piece 340 and the number of notches, the width of the notches can be used as factors to adjust the coating requirements. For example, when the thickness is determined, changing the width of the notch can change the coating width, changing the number of notches to form a corresponding number of coating channels can form a corresponding number of coating layers, or changing the thickness of the glue path shunt piece 340 can change the size of the coating channel in the thickness direction, thereby changing the glue outlet amount. Therefore, the glue path shunt piece 340 with different notch structures can be configured as a spare part, and different glue coating modes can be realized by detaching and replacing the glue path shunt piece 340, without the need to disassemble and replace the entire coating lip, which is convenient to operate, has good flexible adaptability, and when the coating lip is applied to the flow-limiting hot melt glue gun 10, the front lip body 320 and the rear lip body 330 can be used as basic components, which can support the expansion of multiple glue coating modes by replacing the glue path shunt piece 340, thereby reducing the cost of replacing parts.

[0081] In this embodiment, the flow limiting assembly 100 is arranged between the glue outlet 2112 of the valve body 210 and the glue injection port 3111 of the front lip body 320. The limiting member 110 and the adjusting member 120 of the flow limiting assembly 100 are respectively connected to the valve body 210 and the front lip body 320. In other embodiments, the flow limiting assembly 100 can also be connected to the valve body 210 only, and the limiting member 110 and the adjusting member 120 are arranged at the glue outlet 2112 of the valve body 210, or the flow limiting assembly 100 is connected to the front lip body 320 and the rear lip body 310 only, and the limiting member 110 and the adjusting member 120 are arranged at the position of the glue injection port 3111 of the front lip body 320, or the limiting member 110 and the adjusting member 120 are connected to the front lip body 320 and arranged between the glue injection port 3111 and the coating channel 311 of the front lip body 320, etc., as long as the flow limiting assembly 100 can control the flow of the glue liquid and the adhesive discharged from the final coating port 3112. In another embodiment, an adapter can be arranged between the valve body 210 and the front lip body 320, which is used to connect the valve and the coating lip, and the adapter is internally provided with a channel communicating the glue outlet 2112 of the valve and the glue injection port 3111 of the coating lip. The adapter can be connected to the flow limiting assembly 100, which is used to adjust the flux of the internal channel of the adapter to achieve the adjustment and conduction of the glue liquid and the adhesive. For example, the limiting member 110 and the adjusting member 120 can be arranged at the outlet of the internal channel of the adapter to adjust the flow of the glue liquid and the adhesive entering the glue injection port 3111 of the coating lip from the channel; or the limiting member 110 and the adjusting member 120 can be arranged at the inlet of the internal channel of the adapter to adjust the flow of the glue liquid and the adhesive entering the internal channel of the adapter from the valve; or the limiting member 110 and the adjusting member 120 can be arranged at the middle part of the internal channel of the adapter to adjust the opening degree of the channel, so as to adjust the flow of the glue liquid and the adhesive passing through the internal channel of the adapter.

[0082] The flow limiting hot melt glue gun 10 of the embodiment of the utility model moves through the shielding part 122 relative to the gun body 400, changes the glue guiding area of the glue guiding channel 1211, controls the flow of the glue liquid and the adhesive guided from the glue outlet 2112 to the glue injection port 3111, thereby realizing the adjustment of the glue liquid and the adhesive glue output, improving the precision and efficiency of the glue injection operation, simplifying the operation mode of adjusting the glue output, and reducing the disassembly and replacement of the components of the flow limiting hot melt glue gun 10 to prolong the service life of the components.

[0083] In some embodiments, referring to Figure 7As shown, the flow-limited hot melt glue gun 10 includes a plurality of valves and lips, the plurality of valves are arranged at intervals, and the plurality of valves are respectively connected with the lips, and a flow-limiting assembly 100 is arranged between each valve body 210 and the front lip body 320. When coating is needed, the amount of glue of each valve body 210 can be controlled by adjusting the position of the shielding part 122 of each flow-limiting assembly 100, so that the amount of glue liquid and adhesive discharged from the coating port 3112 of each front lip body 320 and rear lip body 330 remains consistent. In this way, the glue liquid and adhesive of each valve and lip are controlled, and the uniform glue discharge and adjustment of the glue liquid and adhesive are realized.

[0084] Further, in some embodiments, referring to Figure 8 and Figure 9 As shown, the inside of the gun body 400 also defines a backflow channel 430, which communicates with the glue inlet channel 410 and the glue outlet channel 420. In addition, the flow-limited hot melt glue gun 10 also includes a safety valve 500 connected to the gun body 400, which is used to switch the on-off of the backflow channel 430 and the glue outlet channel 420, and the safety valve 500 is configured to conduct the backflow channel 430 when the pressure in the glue outlet channel 420 is greater than a preset value. Specifically, in this embodiment, the flow-limited hot melt glue gun 10 includes a gear pump 600 connected to the gun body 400. When glue is injected, the glue liquid and adhesive input into the glue inlet channel 410 can be delivered to the glue outlet channel 420 by the gear pump 600, and the glue liquid and adhesive in the glue inlet channel 410 enter the gear pump 600 through the liquid suction port of the gear pump 600, and then are discharged through the liquid discharge port of the gear pump 600, realizing the metering delivery of the glue liquid and adhesive.

[0085] It can be understood that the gear pump 600 is a commonly used fluid pumping device, which generally includes a pump shell with a liquid suction port and a liquid discharge port, and a gear mechanism inside the pump shell. The volume change caused by the meshing and rotation of the gear mechanism realizes the suction and discharge of the fluid, and the volume change caused by the continuous rotation of the gear enables the gear pump 600 to provide stable flow and be suitable for delivering high-viscosity liquids. In the embodiment of the application, the gear pump 600 can be driven to rotate by a servo motor 610, and the gear pump 600 sucks and discharges the adhesive during the rotation of the gear, realizing the metering pumping of the adhesive. On the side of the liquid suction port, the gear teeth on the side of the gear facing the liquid suction port disengage, forming a vacuum, and the adhesive in the glue inlet channel 410 is sucked into the pump shell through the liquid suction port; on the side of the discharge port, the gear teeth on the side of the gear facing the liquid discharge port re-engage, compressing and discharging the liquid to the glue outlet channel 420.

[0086] Therefore, during the continuous delivery of the adhesive fluid and the adhesive by the gear pump 600, if the glue outlet channel 420 is blocked, the pressure on the discharge side of the gear pump 600 increases, thereby increasing the pressure in the glue outlet channel 420. When the pressure in the glue outlet channel 420 is greater than the preset value, the safety valve 500 is turned on to the return channel 430, at this time, part of the liquid in the glue outlet channel 420 can return to the glue inlet channel 410 from the return channel 430, thereby balancing the pressure of the glue outlet channel 420 and the glue inlet channel 410, that is, the pressure of the suction port and the discharge port of the gear pump 600 can be effectively balanced, thereby protecting the gear pump 600, avoiding mechanical failure or damage caused by overpressure, thereby improving the safety of the adhesive fluid and adhesive metering glue coating applicator, ensuring continuous gluing production, and facilitating the improvement of production efficiency and coating effect.

[0087] In this embodiment, the inside of the gun body 400 defines a first chamber 440 and a second chamber 450. The glue inlet channel 410 and the glue outlet channel 420 are respectively communicated with the first chamber 440, the gear pump 600 is arranged in the first chamber 440, the second chamber 450 is communicated with the return channel 430, and the safety valve 500 is arranged in the second chamber 450. The safety valve 500 includes a valve body 510 and a valve core assembly. The valve body 510 is installed in the first installation chamber, and has an inner cavity, a liquid inlet 511 and a return hole 512. The liquid inlet 511 is communicated with the liquid outlet channel, the return hole 512 is communicated with the return channel 430, and the return hole 512 is communicated with the inner cavity. A valve is further arranged in the valve body 510 to communicate the liquid inlet 511 and the inner cavity. The valve core assembly is arranged in the inner cavity to switch the opening and closing of the valve, thereby switching the connection and disconnection of the liquid inlet 511 and the return hole 512. The valve core assembly is configured to turn on the liquid inlet 511 and the return hole 512 when the pressure at the liquid inlet 511 is greater than the preset value, so as to connect the liquid outlet channel and the return channel 430. The safety valve 500 can be a pneumatic return valve, which drives the valve core by the pressure difference between the air pressure and the adhesive pressure to control the opening and closing of the valve. When the pressure at the liquid inlet 511 is greater than the preset value, the valve is opened to turn on the liquid inlet 511 and the return hole 512, and when the pressure at the liquid inlet 511 is less than or equal to the preset value, the return hole 512 is closed under the action of the air pressure. Thus, the opening and closing of the valve is driven by compressed air, which has the advantage of fast response and is suitable for automatic control applications.

[0088] Alternatively, refer to Figure 9As shown, the safety valve 500 can also be a threaded adjusting backflow valve, the valve body 510 has a valve seat 513 inside, the valve seat 513 is provided with a valve port 514 which communicates the inner cavity and the liquid inlet 511. The valve core assembly includes an adjusting rod 520, a spring 530, a valve core rod 540, a ball 550, the spring 530 keeps the valve core rod 540 abutting the ball 550 abutting the valve seat 513 to close the valve port 514 and block the communication between the liquid inlet 511 and the backflow hole 512. When the pressure at the liquid inlet 511 is greater than the preset value, the adhesive pushes the ball 550 at the valve port 514 to drive the valve core rod 540 to overcome the elastic force of the spring 530 to move, thereby opening the valve port 514, thereby conducting the liquid inlet 511 and the backflow hole 512. In use, by adjusting the relative position between the adjusting rod 520 and the valve body 510 through the adjusting nut 560, the tightness of the pressure spring 530 can be adjusted, that is, the size of the force of the spring 530 pressing the valve core rod 540 is adjusted, thereby realizing the adjustment of different opening and closing pressures (that is, the preset value) to adapt to different use requirements, having high reliability and stability, and the structure is relatively simple, and maintenance and maintenance are relatively convenient.

[0089] In some embodiments, referring to Figure 7 and Figure 8 As shown, the flow-limited hot melt glue gun 10 can also include a filter assembly 700, and the gun body 400 is also provided with a third chamber 460, for example, the third chamber 460 is provided on the gun body 400, the third chamber 460 is communicated with the glue inlet channel 410, and the filter assembly 700 is installed in the third chamber 460 and is used for filtering the glue liquid and the adhesive in the glue inlet channel 410 before entering the gear pump 600, thereby effectively preventing impurities in the glue liquid and the adhesive from entering the gear pump 600, thereby protecting the precision of the gear pump 600 and reducing the damage probability of the gear pump 600.

[0090] As an example, in application, the flow-limited hot melt glue gun 10 of the utility model embodiment can deliver the glue liquid and the adhesive into the glue inlet channel 410 of the gun body 400 through the delivery hose, filter the glue liquid and the adhesive through the filter assembly 700, and then enter the gear pump 600, the gear pump 600 pumps the glue liquid and the adhesive to the glue outlet channel 420, and then the glue liquid and the adhesive pass through the valve body 210 and the flow-limiting assembly 100 to enter the flow-limiting lip 300, and finally pass through the coating channel 311 of the flow-limiting lip 300 and are discharged from the coating port 3112 for glue liquid and adhesive coating. The glue outlet channel 420 is connected to the glue inlet channel 410 through the safety valve 500 and the backflow channel 430, when the pressure in the glue outlet channel 420 is greater than the preset value, the safety valve 500 conducts the backflow channel 430 and the glue outlet channel 420, thereby connecting the glue outlet channel 420 to the glue inlet channel 410 through the backflow channel 430, and realizing the backflow of the glue liquid and the adhesive.

[0091] The hot melt glue gun 10 capable of limiting flow can be used for polyamine hot melt adhesive, and can also be applied to adhesive spraying of various products, for example, used for paper box handle bonding, paper box, paper cup, sanitary product and straw bonding and the like.

[0092] The embodiments of the utility model are explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model. In addition, the embodiments and the features in the embodiments of the utility model can be combined with each other without conflict.

Claims

1. A flow limiting assembly for regulating the flow of adhesive fluid and adhesive, characterised in that, The application relates to a flow-limiting assembly. The flow-limiting assembly comprises a limiting member and an adjusting member. The limiting member has a limiting groove. The adjusting member comprises a movable part and a shielding part. The movable part is spaced apart from the limiting member and jointly defines a glue guiding channel.

2. The current limiting assembly of claim 1, wherein, The glue guiding channel is adapted to correspond to a glue outlet.

3. The current limiting assembly of claim 2, wherein, The shielding part is arranged in the limiting groove.

4. The flow limiting assembly of claim 2, wherein, The movable part can drive the shielding part to move relative to the limiting member.

5. The current limiting assembly of claim 1, wherein, The shielding part switches between a first position and a second position.

6. The flow limiting assembly of claim 1, wherein, In the first position, the shielding part exits the glue guiding channel to avoid glue fluid and adhesive.

7. A flow restriction valve characterized by, In the second position, at least part of the shielding part corresponds to the glue guiding channel to hinder the flow of part of the glue fluid and the adhesive. The limiting groove has a first abutting surface and a second abutting surface. The shielding part is arranged between the first abutting surface and the second abutting surface.

8. A flow restricting lip characterized in that, In the first position, the shielding part abuts the first abutting surface. In the second position, the shielding part is spaced apart from the first abutting surface and the second abutting surface. The shielding part also has a third position.

9. A hot melt glue gun that can be flow limited, characterized in that, In the third position, the shielding part abuts the second abutting surface. The shielding part closes the glue guiding channel to limit the flow of glue fluid and adhesive. The first abutting surface and the second abutting surface are inclined surfaces. The flow-limiting assembly further comprises a fastener. The fastener is connected to a side of the movable part away from the shielding part. The fastener is used to limit the movement of the movable part to keep the shielding part in the current position. The side of the movable part away from the shielding part has a groove. The groove is used to drive the movement of the movable part. The groove moves together with the movable part. The application relates to a flow-limiting assembly. The flow-limiting assembly comprises a valve body. The valve body defines a glue injection cavity. The glue injection cavity is communicated with the valve body to form a separated glue inlet and glue outlet. The glue inlet is adapted to input glue fluid and adhesive into the glue injection cavity. The limiting member and the adjusting member are connected to the valve body. The glue guiding channel is communicated with the glue outlet. The shielding part moves relative to the valve body to adjust the glue output of the glue outlet. The application relates to a flow-limiting assembly. The flow-limiting assembly comprises a lip body. The lip body defines a coating channel. The coating channel is communicated with the lip body to form a separated glue injection port and coating port. The limiting member and the adjusting member are connected to the lip body. The glue guiding channel is communicated with the glue injection port. The shielding part moves relative to the lip body to adjust the glue output of the coating port. The application relates to a flow-limiting assembly. The flow-limiting assembly comprises a gun body. The gun body defines a separated glue inlet channel and glue outlet channel. The glue inlet channel is used to input glue fluid and adhesive. The limiting member and the adjusting member are connected to the gun body. The valve body is connected to the gun body. The valve body defines a glue injection cavity. The glue injection cavity is communicated with the valve body to form a separated glue inlet and glue outlet. The glue inlet is communicated with the glue outlet channel. The glue outlet is communicated with the glue outlet channel. The coating lip comprises a front lip body and a rear lip body connected together, a glue path shunt is arranged between the front lip body and the rear lip body, the front lip body and the rear lip body define a coating channel, one end of the coating channel is a glue injection port, the other end is a coating port, the glue injection port is communicated with the glue outlet, the glue path shunt is arranged in the coating channel and is used for defining a glue outlet area of the coating port, and the coating port is used for outputting glue liquid and adhesive; The valve is connected with the flow limiting assembly, the limiting member and the adjusting member are connected to the valve body, the glue guide channel is communicated with the glue outlet, and the shielding part moves relative to the valve body to adjust the glue output of the glue outlet, and / or the coating lip is connected with the flow limiting assembly, the limiting member and the adjusting member are connected to the coating lip, the glue guide channel is communicated with the glue injection port, and the shielding part moves relative to the coating lip to adjust the glue output of the coating port.

10. The flow-restrictable hot melt glue gun of claim 9, wherein, The gun body further defines a backflow channel, the backflow channel is communicated with the glue inlet channel and the glue outlet channel, the flow-limitable hot melt glue gun further comprises a safety valve, the safety valve is connected to the gun body and is used for switching the on-off of the backflow channel and the glue outlet channel, and the safety valve is configured to turn on the backflow channel when the pressure in the glue outlet channel is greater than a preset value.

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