Glue gun and filter stick forming machine

Abstract

The utility model discloses a glue gun and a filter stick forming machine. The glue gun comprises a glue gun body and a glue needle. The glue gun body comprises a glue outlet cavity. And a glue outlet is formed in the first end of the glue outlet cavity in the first direction. The inner surface of the glue outlet cavity comprises a first cylindrical surface section located at one end of the glue outlet and a first conical surface section arranged at one end, away from the glue outlet, of the first cylindrical surface section. And the small-diameter end of the first conical surface section is connected with the first cylindrical surface section. The glue needle is configured to be movably arranged in the glue outlet cavity in the first direction so as to close or open the glue outlet. The outer surface of the glue needle comprises a matching surface matched with the inner surface of the glue outlet cavity, the matching surface comprises a second cylindrical surface section and a second conical surface section, when the glue outlet is closed by the glue needle, the second cylindrical surface section and the first cylindrical surface section are coaxially arranged and mutually attached, and the second conical surface section and the first conical surface section are coaxially arranged and mutually attached. The end part, close to the glue outlet, of the glue needle comprises the matching surface matched with the inner surface of the glue outlet cavity, so that the sealing performance is improved, and the glue leakage problem is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter stick manufacturing technical field relates to a glue gun and filter stick forming machine. BACKGROUND

[0002] The filter stick of cigarette needs to wrap a layer of forming paper on the outermost side of filter core when forming, and the filter core (such as cellulose acetate) wrapped by forming paper needs to be bonded by glue gun at the lap joint of forming paper. The glue outlet of glue gun outputs glue to bond the lap joint of forming paper.

[0003] In the research process, the inventor found that the glue gun of the prior art would produce glue leakage problem during shutdown, especially when shutting down, the glue gun would appear glue seepage phenomenon, if the glue solidified, it would cause the glue outlet of glue gun to be blocked and affect its normal glue output. Moreover, the glue seepage of glue gun would make glue flow to the surrounding environment, which would affect the normal operation of the surrounding environment equipment.

[0004] It should be noted that the statements in this background section are provided only to generally relate to the present utility model and do not necessarily constitute prior art. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of glue gun and filter stick forming machine to improve the glue leakage problem of glue gun.

[0006] The utility model provides a kind of glue gun, comprising:

[0007] Glue gun body, with the glue cavity extending along the first direction, and the first end of the first direction of glue cavity is formed with glue outlet;The inner surface of glue cavity includes the first cylindrical section at one end of glue outlet and the first conical section away from the one end of glue outlet of first cylindrical section, and the small diameter end of first conical section is connected with first cylindrical section;And

[0008] Glue needle is configured to be movably arranged in glue cavity along the first direction to close or open glue outlet, and the outer surface of glue needle includes matching surface matched with the inner surface of glue cavity, and the matching surface includes second cylindrical section and second conical section, and when glue needle closes glue outlet, second cylindrical section is coaxially arranged with first cylindrical section and mutually adheres, and second conical section is coaxially arranged with first conical section and mutually adheres.

[0009] In some embodiments, the extension length of the first conical section in the first direction is greater than the extension length of the second conical section in the first direction.

[0010] In some embodiments, the outer surface of glue needle further includes third cylindrical section connected with second conical section, the small diameter end of second conical section is connected with second cylindrical section, and the large diameter end of second conical section is connected with third cylindrical section, and in the first direction, first conical section extends to the back side of third cylindrical section.

[0011] In some embodiments, the inner surface of the glue outlet cavity further comprises a fourth cylindrical section connected with the first conical section, when the glue needle moves relative to the glue outlet cavity to open the glue outlet, the glue liquid passes through the fourth cylindrical section, the first conical section and the first cylindrical section in sequence.

[0012] In some embodiments, the glue gun further comprises a shell, the glue gun body is fixedly arranged on the shell, the shell has a gas cavity and a glue liquid cavity arranged adjacent in the first direction, the glue liquid cavity is arranged at the second end of the glue outlet cavity in the first direction and is in fluid communication with the glue outlet cavity to input glue liquid into the glue outlet cavity, the second end of the glue needle is connected with the first cavity wall of the gas cavity, and the pressure of the gas cavity is adjustably arranged to act on the second end of the glue needle to drive the glue needle to move.

[0013] In some embodiments, the first cavity wall of the gas cavity is configured as a rubber wall, the edge of the rubber wall is sealingly connected with the shell to isolate the gas cavity and the glue liquid cavity, and the middle part of the rubber wall is connected with the second end of the glue needle.

[0014] In some embodiments, the gas cavity further comprises a second cavity wall arranged opposite to the rubber wall, the second cavity wall is movably arranged relative to the shell and is connected with the end of the shell through a spring, and the second cavity wall is connected with the middle part of the rubber wall, when the gas cavity is filled with gas, the second cavity wall compresses the spring and drives the middle part of the rubber wall to move away from the glue outlet under the action of the gas pressure.

[0015] In some embodiments, the outer side of the glue gun body is connected with a connecting flange, and the glue gun body is connected with the shell through the connecting flange.

[0016] In some embodiments, the glue gun further comprises a gas pipe connected with the gas cavity to adjust the pressure of the gas cavity, the gas pipe is a bent pipe and comprises a first gas pipe section extending in a second direction and a second gas pipe section extending in the first direction, the second direction is perpendicular to the first direction, and the first gas pipe section is arranged close to the gas cavity and is in gas connection with the gas cavity; and / or, the glue gun further comprises a glue inlet pipe connected with the glue liquid cavity to deliver glue liquid to the glue liquid cavity, the glue inlet pipe is a bent pipe and comprises a first glue inlet pipe section extending in a third direction and a second glue inlet pipe section extending in the first direction, the third direction is perpendicular to the first direction and the second direction, and the first glue inlet pipe section is arranged close to the glue liquid cavity and is in fluid connection with the glue liquid cavity.

[0017] In some embodiments, the glue gun is a lap glue gun.

[0018] The second aspect of the utility model provides a filter rod forming machine, glue gun is used for the joint of the filter rod forming machine.

[0019] The utility model provides a technical scheme, glue gun includes glue gun body and glue needle.

[0020] Other features and advantages of the utility model will become clear from the following detailed description of exemplary embodiments of the utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are included to provide a further understanding of the utility model, form a part of the application and help to explain the utility model. The exemplary embodiments of the utility model and its specific description are used to explain the utility model and do not constitute improper limitation on the utility model. In the drawings:

[0022] Figure 1 It is the sectional structure schematic diagram of the glue gun shown in the figure.

[0023] Figure 2 It is the sectional structure schematic diagram of the glue gun shown in the figure. Figure 1

[0024] Figure 3 It is the sectional structure schematic diagram of the glue gun shown in the figure.

[0025] Figure 4 It is the sectional structure schematic diagram of the glue gun shown in the figure. Figure 3

[0026] Figure 5 Figure 3 ​​​A schematic diagram of the cross-sectional structure of the glue gun from another direction.

[0027] Figure label:

[0028] 10. Glue gun body; 10a. Glue dispensing chamber; 11. Glue outlet; 110. First cylindrical section; 120. First conical section; 130. Fourth cylindrical section; 210. Second cylindrical section; 220. Second conical section; 230. Third cylindrical section;

[0029] 20. Glue needles;

[0030] 30. Shell; A. Air cavity; B. Adhesive cavity;

[0031] 40. Trachea;

[0032] 50. Inlet hose;

[0033] 60. Rubber wall;

[0034] 70. Spring;

[0035] 80. Partition;

[0036] X, first direction; Z, second direction; Y, third direction. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0039] For the purposes of this description, spatially relative terms such as "beneath", "below", "lower", "above", "upper" and the like can be used to describe one element's or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0040] The inventor found in the research process that the glue needle and the cavity wall of the glue outlet cavity of the glue gun body in the related technology cannot form a sealed and effective fit, so that the glue needle may be eccentric relative to the center of the glue outlet cavity, causing glue leakage, glue overflow and other problems.

[0041] In order to improve the above-mentioned glue leakage problem of the glue gun, the utility model provides a glue gun, the shape of the outer surface of the glue needle is improved so that the outer surface of the glue needle is completely matched with the shape of the inner surface of the glue outlet cavity, thereby improving the fit sealing between the glue needle and the glue outlet cavity, and effectively improving the glue leakage problem.

[0042] Reference Figure 1 And Figure 2 The utility model provides a glue gun, the shape of the outer surface of the glue needle is improved so that the outer surface of the glue needle is completely matched with the shape of the inner surface of the glue outlet cavity, thereby improving the fit sealing between the glue needle and the glue outlet cavity, and effectively improving the glue leakage problem.

[0043] Reference Figure 2The length direction of the glue gun is along the first direction X. The first end of the first direction X of the glue gun body 10 has a glue outlet 11, and the glue needle 20 is movably arranged in the glue gun body 10. Thus, when glue is needed, the glue needle 20 is controlled to move along the first direction X to a direction away from the glue outlet 11 to open the glue outlet and make the glue liquid in the glue outlet cavity 10a flow out through the glue outlet; when glue is not needed, the glue needle 20 is controlled to move along the first direction X to a direction towards the glue outlet 11 to make the end of the glue needle 20 extend into the glue outlet 11 to close the glue outlet 11 and stop glue.

[0044] Reference Figure 1 And Figure 2 The glue outlet end of the glue gun body 10 is formed as a columnar cavity, the port of the columnar cavity is formed as the glue outlet 11, and the inner surface of the columnar cavity is formed as a first cylindrical surface section 110. The glue gun body 10 further includes a conical cavity adjacent to the columnar cavity, and the inner surface of the conical cavity is formed as a first conical surface section 120. The small-diameter end of the first conical surface section 120 is located at one end close to the glue outlet 11 and connected with the first cylindrical surface section 110, and the large-diameter end of the first conical surface section 120 is located at one end away from the glue outlet 11.

[0045] The end of the glue needle 20 close to the glue outlet 11 includes a matching surface matched with the inner surface of the glue outlet cavity 10a. The matching surface includes a second cylindrical surface section 210 and a second conical surface section 220. When the glue gun is closed, the second cylindrical surface section 210 is coaxially arranged with the first cylindrical surface section 110 and abuts against each other, and the second conical surface section 220 is coaxially arranged with the first conical surface section 120 and abuts against each other, so that the matching area between the glue needle 20 and the glue gun body 10 is increased, and the sealing performance is improved, effectively improving the glue leakage problem. Moreover, the glue needle and the glue gun body are coaxially arranged in the embodiment of the utility model, and the second conical surface section 220 and the first conical surface section 120 are abutted through the inclined surface, so that the eccentricity of the glue needle in the glue gun body is avoided, and the overflow or leakage of the glue liquid from the eccentric position gap is prevented.

[0046] Reference Figure 2 In some embodiments, the extension length of the first conical surface section 120 in the first direction X is greater than the extension length of the second conical surface section 220 in the first direction X. Thus, only a small part of the first conical surface section 120 abuts against the second conical surface section 220, and most of the first conical surface section 120 is located on the radial outside of the glue needle and does not contact the glue needle, so that the movement of the glue needle in the glue outlet cavity 10a can be facilitated on the basis of ensuring good sealing performance.

[0047] In some embodiments, the outer surface of the glue needle 20 further comprises a third cylindrical section 230 connected with the second tapered section 220. The small-diameter end of the second tapered section 220 is connected with the second cylindrical section 210, and the large-diameter end of the second tapered section 220 is connected with the third cylindrical section 230. In the first direction X, the first tapered section 120 extends to the rear side of the third cylindrical section 230.

[0048] In the first direction X, the outer surface of the glue needle 20 is sequentially provided with the second cylindrical section 210, the second tapered section 220, and the third cylindrical section 230. In this way, only a section of the outer surface of the glue needle 20 located at the end of the glue outlet is in contact with the inner surface of the glue outlet cavity, and most of the outer surface of the glue needle 20 is located inside the inner surface of the glue outlet cavity 10a, that is, the glue needle 20 and the glue outlet cavity 10a are spaced apart and have a gap in the radial direction, which provides space for the rearward movement of the glue needle 20, reduces the friction when the glue needle 20 moves, and further makes the movement of the glue needle smoother.

[0049] In some embodiments, the inner surface of the glue outlet cavity 10a further comprises a fourth cylindrical section 130 connected with the first tapered section 120. When the glue needle 20 moves relative to the glue outlet cavity 10a to open the glue outlet 11, the glue passes through the fourth cylindrical section 130, the first tapered section 120, and the first cylindrical section 110 in sequence to be discharged. The provision of the fourth cylindrical section 130 makes the volume behind the glue gun smaller and the structure more compact. In this way, the glue is guided and focused by the first tapered section 120 when flowing outward, and is thus concentrated at the centrally located glue outlet, so that the glue discharge is more concentrated.

[0050] Reference Figures 3 to 5 In some embodiments, the glue gun further comprises a housing 30. The glue gun body 10 is fixedly arranged on the housing 30. The housing 30 has a gas cavity A and a glue liquid cavity B arranged adjacent to each other in the first direction X. The glue liquid cavity B is arranged at the second end of the glue outlet cavity 10a in the first direction and is in fluid communication with the glue outlet cavity 10a to input glue liquid into the glue outlet cavity 10a. The second end of the glue needle 20 is connected with the first cavity wall of the gas cavity A, and the pressure of the gas cavity A is adjustably arranged to act on the second end of the glue needle 20 to drive the glue needle 20 to move.

[0051] Reference Figure 4 The gas cavity A is formed by the oppositely arranged first cavity wall and second cavity wall and the inner wall of the housing 30. Among them, the edge of the first cavity wall is sealingly connected with the inner wall of the housing 30, that is, the edge of the first cavity wall is stationary relative to the inner wall of the housing 30. The second cavity wall is movable relative to the inner wall of the housing 30, and the middle part of the second cavity wall is connected with the end of the housing 30 through the spring 70.

[0052] In some embodiments, the second cavity wall of the gas cavity A opposite to the first cavity wall is connected with the housing 30 through the spring 70. The spring 70 can be a compression spring.

[0053] In some embodiments, the second cavity wall comprises a partition 80.

[0054] When the pressure of the air cavity A increases, the partition 80 and the spring 70 connected with the partition 80 are acted on to compress the spring, and then the partition 80 moves backward, so that the second end of the glue needle 20 also moves backward to open the glue outlet 11. When the pressure of the air cavity A decreases, the partition 80 moves forward under the elastic force of the spring 70, and then the glue needle 20 also moves forward to close the glue outlet 11.

[0055] The glue gun of the embodiment of the utility model controls the glue needle 20 to move to close or open the glue outlet by adjusting the pressure of the air cavity A, which is simple and easy to realize.

[0056] In some embodiments, the air cavity A is connected with an air pump to realize the pressure adjustment of the air cavity A.

[0057] In some embodiments, the first cavity wall of the air cavity A is configured as a rubber wall 60. The rubber wall 60 is sealingly connected with the shell 30 to isolate the air cavity A and the glue liquid cavity B. The middle part of the rubber wall 60 is connected with the glue needle 20, so that the rubber wall 60 and the glue needle 20 do not move relatively during the extension and retraction of the glue needle 20, and the rubber wall 60 and the shell 30 form a seal, thereby realizing the effective sealing isolation between the glue liquid cavity B and the air cavity A.

[0058] The rubber wall 60 has elasticity, and the middle part of the rubber wall 60 is connected with the partition 80, so that when the pressure of the air cavity A increases, the partition 80 moves backward under the action of the air pressure to pull the middle part of the rubber wall 60 to make the middle part of the rubber wall 60 bulge backward, thereby driving the glue needle 20 to move backward to open the glue outlet; when the pressure of the air cavity A decreases, the partition 80 moves forward under the action of the spring to make the middle part of the rubber wall 60 move forward, thereby driving the glue needle 20 to move forward to close the glue outlet.

[0059] In some embodiments, the outside of the glue gun body 10 is connected with a connecting flange, and the glue gun body 10 is connected with the shell 30 through the connecting flange.

[0060] In some embodiments, the glue gun further includes an air tube 40 connected to an air chamber A to adjust the pressure of the air chamber A. The air tube 40 is a bent tube and includes a first air tube segment extending along a second direction Z and a second air tube segment extending along a first direction X, the second direction Z being perpendicular to the first direction X. The first air tube segment is disposed near the air chamber A and is in gas connection with the air chamber A. The glue gun further includes an inlet tube 50 connected to a glue chamber B to deliver glue to the glue chamber B. The inlet tube 50 is a bent tube and includes a first inlet tube segment extending along a third direction Y and a second inlet tube segment extending along the first direction X, the third direction Y being perpendicular to the first direction X and the second direction Z. The first inlet tube segment is disposed near the glue chamber B and is in fluid connection with the glue chamber B.

[0061] The second air tube section extends along the first direction X and is connected to the air pump. The second glue inlet tube section extends along the first direction X and is connected to the glue pump. In this embodiment of the glue gun, both the air tube 40 and the glue inlet tube 50 are set as bent tubes, so that the tube sections directly connected to the external air pump and glue pump both extend along the first direction X, which facilitates connection with the outside world.

[0062] like Figure 3 As shown, in some embodiments, the air pipe 40 and the glue inlet pipe 50 are respectively arranged on different sides of the housing 30, which can avoid structural interference between them.

[0063] It should be noted here that... Figures 3 to 5 The structure of the glue gun body 10 and glue needle 20 in the embodiment can be referred to Figure 1 and Figure 2 Description of the embodiments.

[0064] In some embodiments, the glue gun is a splice glue gun. The splice glue gun is used to dispense glue to bond the splice joints of the forming paper.

[0065] This utility model also provides a filter rod forming machine including a glue gun. The glue gun is used to bond the overlapping joints of the forming paper. After being cut by the filter rod slitting machine and conveyed by the filter rod conveyor, the filter rods arrive at the filter rod forming machine to be formed under the wrapping of the forming paper.

[0066] As can be seen from the descriptions of the above embodiments, the glue gun of this utility model improves the outer surface of the glue needle to form an effective sealing fit between the outer surface of the glue needle and the inner surface of the glue gun body, thereby preventing glue leakage when the machine is stopped. This also prevents glue from overflowing or leaking and accumulating to form glue stalactites that remain on the machine bed during cleaning, thus preventing wear on the machine bed.

[0067] Furthermore, improvements to the glue gun leakage problem have reduced issues such as equipment slippage, bursting, and uneven glue application caused by glue gun leakage.

[0068] It should be noted that the above examples are used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. A glue gun characterized in that, The application relates to a glue gun, comprising: a glue gun body (10) provided with a glue discharging cavity (10a) extending along a first direction (X), wherein a first end of the first direction (X) of the glue discharging cavity (10a) is provided with a glue discharging opening (11); and an inner surface of the glue discharging cavity (10a) comprises a first cylindrical surface section (110) located at one end of the glue discharging opening (11) and a first conical surface section (120) arranged at a position away from the one end of the glue discharging opening (11) of the first cylindrical surface section (110), wherein a small-diameter end of the first conical surface section (120) is connected with the first cylindrical surface section (110); and a glue needle (20) movably arranged in the glue discharging cavity (10a) along the first direction (X) to close or open the glue discharging opening (11), wherein an outer surface of the glue needle (20) comprises a matching surface matched with the inner surface of the glue discharging cavity (10a), and the matching surface comprises a second cylindrical surface section (210) and a second conical surface section (220), wherein, when the glue needle (20) closes the glue discharging opening (11), the second cylindrical surface section (210) is coaxially arranged with the first cylindrical surface section (110) and abuts against each other, and the second conical surface section (220) is coaxially arranged with the first conical surface section (120) and abuts against each other.

2. The glue gun of claim 1, wherein, An extension length of the first conical surface section (120) along the first direction (X) is greater than an extension length of the second conical surface section (220) along the first direction (X).

3. The glue gun of claim 2, wherein, The outer surface of the glue needle (20) further comprises a third cylindrical surface section (230) connected with the second conical surface section (220), wherein a small-diameter end of the second conical surface section (220) is connected with the second cylindrical surface section (210), a large-diameter end of the second conical surface section (220) is connected with the third cylindrical surface section (230), and the first conical surface section (120) extends to a rear side of the third cylindrical surface section (230) along the first direction.

4. The glue gun of claim 1, wherein, The inner surface of the glue discharging cavity (10a) further comprises a fourth cylindrical surface section (130) connected with the first conical surface section (120), and, when the glue needle (20) moves relative to the glue discharging cavity (10a) to open the glue discharging opening (11), glue liquid sequentially passes through the fourth cylindrical surface section (130), the first conical surface section (120) and the first cylindrical surface section (110) to be discharged.

5. The glue gun according to any one of claims 1 to 4, wherein, The glue gun further comprises a shell (30), wherein the glue gun body (10) is fixedly arranged on the shell (30), the shell (30) is provided with a gas cavity (A) and a glue liquid cavity (B) arranged adjacent to each other along the first direction (X), the glue liquid cavity (B) is arranged at a second end of the first direction of the glue discharging cavity (10a) and is in fluid communication with the glue discharging cavity (10a) to input glue liquid into the glue discharging cavity (10a), a second end of the glue needle (20) is connected with a first cavity wall of the gas cavity (A), and the pressure of the gas cavity (A) is adjustably arranged to act on the second end of the glue needle (20) to drive the glue needle (20) to move.

6. The glue gun of claim 5, wherein, The first cavity wall of the air cavity (A) is configured as a rubber wall (60), the edge of the rubber wall (60) is sealingly connected with the shell (30) to isolate the air cavity (A) and the glue liquid cavity (B), and the middle part of the rubber wall is connected with the second end of the glue needle (20).

7. The glue gun of claim 6, wherein, The air cavity (A) further comprises a second cavity wall arranged opposite to the rubber wall (60), the second cavity wall is movably arranged relative to the shell (30) and connected with the end of the shell (30) through a spring (70), and the second cavity wall is connected with the middle part of the rubber wall, when the air cavity (A) is filled with air, the second cavity wall compresses the spring (70) under the action of air pressure and drives the middle part of the rubber wall to move away from the glue outlet.

8. The glue gun of claim 5, wherein, The outer side of the glue gun body (10) is connected with a connecting flange, and the glue gun body (10) is connected with the shell (30) through the connecting flange.

9. The glue gun of claim 5, wherein, The glue gun further comprises an air pipe (40) connected with the air cavity (A) to adjust the pressure of the air cavity (A), the air pipe (40) is a bent pipe and comprises a first air pipe section extending along a second direction (Z) and a second air pipe section extending along the first direction (X), the second direction (Z) is perpendicular to the first direction (X), the first air pipe section is arranged close to the air cavity (A) and is in gas connection with the air cavity (A); and / or the glue gun further comprises a glue inlet pipe (50) connected with the glue liquid cavity (B) to deliver glue liquid to the glue liquid cavity (B), the glue inlet pipe (50) is a bent pipe and comprises a first glue inlet pipe section extending along a third direction (Y) and a second glue inlet pipe section extending along the first direction (X), the third direction (Y) is perpendicular to the first direction (X) and the second direction (Z), the first glue inlet pipe section is arranged close to the glue liquid cavity (B) and is in fluid connection with the glue liquid cavity (B).

10. The glue gun of claim 1, wherein, The glue gun is a lap glue gun.

11. A filter rod maker characterized by The glue gun as claimed in any one of claims 1 to 10 is used for bonding the lap joint of the formed paper.

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