A glue gun mixing tube replacement mechanism

Abstract

The utility model discloses a kind of glue gun mixed pipe replacement mechanism, belong to automatic gluing technical field, the device will glue supply part and glue gun mixed pipe modularization, and by compacting mechanism, the upper module is slidably arranged in the mounting space formed by frame, and in the mounting space, the clamping block for abutting with lower module to prevent lower module from separating from mounting space in the sliding direction of upper module is set, whereby lower module can be compacted in mounting space by upper module and docking, to complete the full-automatic replacement of glue gun mixed pipe, can greatly improve glue gun mixed pipe replacement efficiency, reduce the labor intensity of staff, while glue gun mixed pipe replacement frequency can be strictly guaranteed, avoid glue gun mixed pipe replacement too early or too late, when glue gun mixed pipe is replaced, the compacting force between upper module and lower module can be ensured by compacting mechanism, ensure that upper module and lower module are compacted in place, avoid artificial replacement glue gun mixed pipe when tightening not in place.

Description

Technical Field

[0001] This utility model relates to the field of automated glue application technology, specifically a glue gun mixing tube replacement mechanism. Background Technology

[0002] For products such as car tailgates and spoilers that are bonded with adhesive, the AB glue and plastic mixing tubes need to be replaced at a specified frequency during production.

[0003] Currently, the assembly of glue gun mixing tubes is mostly done manually. Manually tightening the glue gun mixing tube can easily result in it not being tightened properly, causing the glue application trajectory to deviate, thus scrapping the product. In this case, it is necessary to replace the glue gun mixing tube with a new one before production can resume, resulting in material waste and affecting production efficiency and glue application quality.

[0004] Furthermore, traditional manual assembly processes rely heavily on manual assembly and error prevention, depending on worker skill. This method suffers from problems such as incomplete assembly and low production efficiency. Therefore, it is necessary to provide a device that can automatically change the glue gun mixing tube.

[0005] Based on this, the present invention designs a glue gun mixing tube replacement mechanism to solve the above problems. Utility Model Content

[0006] This invention provides a glue gun mixing tube replacement mechanism to solve the technical problems of traditional manual assembly processes, which are highly dependent on the worker's skill level and suffer from incomplete assembly and low production efficiency.

[0007] According to one aspect of the present invention, a glue gun mixing tube replacement mechanism is provided, comprising an upper module, a lower module, a frame, a clamping mechanism, a tooling table, and a robotic arm; the upper module is used to connect to a glue supply line, the lower module is used to connect to a glue gun mixing tube, and the upper module and the lower module are used to dock to introduce glue from the glue supply line into the glue gun mixing tube; an installation space is formed within the frame, the upper module is slidably disposed within the installation space, the lower module is used to slide into the installation space and into the sliding stroke of the upper module, or to leave the installation space and leave the sliding stroke of the upper module, and a clamping block is formed within the installation space to abut against the lower module to prevent the lower module from disengaging from the installation space in the sliding direction of the upper module; the clamping mechanism is disposed on the frame to drive the upper module to slide within the installation space; a plurality of positioning seats are formed on the tooling table for placing and positioning the lower module, the positioning seats also being used to limit the lower module in the direction in which the lower module slides into and out of the installation space; the robotic arm is used to connect to the frame or the upper module to drive the frame and the upper module to move.

[0008] As a further embodiment of this utility model, the upper module includes a sliding part and an upper connector fixedly connected to the sliding part, and the lower module includes a lower connector and a positioning pin. The positioning pin is fixedly disposed on the lower connector and is used to engage with the positioning hole opened in the upper connector to position the upper connector and the lower connector.

[0009] As a further embodiment of this utility model, the sliding part includes a manifold and a slider. The slider is slidably disposed in the installation space formed within the frame. The slider is used to be fixedly connected to the robotic arm. The manifold is fixedly connected to the slider and is used to connect the glue supply line. The upper connector is fixedly connected to the manifold.

[0010] As a further embodiment of this utility model, the frame includes two parallel slide rails and a horizontal plate fixedly connected to the slide rails, forming an installation space between the two slide rails. The sliding part is slidably disposed between the two slide rails and slidably engages with the two slide rails. Each of the two slide rails is provided with a clamping block on the side for slidably engaging with the sliding part.

[0011] As a further embodiment of this utility model, the clamping block is located at the end of the slide rail away from the horizontal plate.

[0012] As a further embodiment of this utility model, a positioning block is fixedly provided on the side of the clamping block, and the positioning block is used to abut against the lower module to position the lower module in the installation space.

[0013] As a further embodiment of this utility model, the pressing mechanism includes a cylinder, which is fixedly mounted on the horizontal plate, and the piston rod of the cylinder is fixedly connected to the upper module.

[0014] As a further embodiment of this utility model, a floating joint is fixedly provided on the piston rod of the cylinder, and the floating joint is fixedly connected to the upper module.

[0015] As a further embodiment of this utility model, the positioning seat includes a placement hole and a positioning plate. The placement hole is opened on the tooling table and is used to place the glue gun mixing tube. The positioning plate is fixed on the tooling table and is used to abut against the lower module to position the lower module at an angle.

[0016] As a further embodiment of this utility model, the end of the glue gun mixing tube used to connect with the lower connector is a variable diameter section. The diameter of the variable diameter section gradually decreases from the end of the glue gun mixing tube closer to the lower connector to the end farther away from the lower connector. The shape of the placement hole matches the shape of the variable diameter section, and the diameter of the top of the placement hole matches the diameter of the middle position of the variable diameter section, so as to prevent the glue gun mixing tube from completely entering the placement hole.

[0017] This utility model has the following beneficial effects:

[0018] This device connects to the glue supply line via an upper module and to the glue gun mixing tube via a lower module, modularizing the glue supply section and the glue gun mixing tube. A clamping mechanism slides the upper module within the mounting space formed by the frame. The lower module can slide into or out of the mounting space and the upper module's sliding stroke. A clamping block within the mounting space prevents the lower module from disengaging from the mounting space during the sliding direction of the upper module. Thus, the upper module presses the lower module into the mounting space and mates it. After matetating, the glue from the glue supply line is introduced into the glue gun mixing tube via both modules. When replacement is needed... When changing the glue gun mixing tube, the clamping mechanism simply drives the upper module away from the lower module, and the robotic arm moves the old lower module into the positioning seat. The new lower module is then moved into the installation space, and the upper module and the new lower module abut against each other to achieve docking. This completes the fully automatic replacement of the glue gun mixing tube, which greatly improves the efficiency of glue gun mixing tube replacement, reduces the labor intensity of workers, and strictly ensures the frequency of glue gun mixing tube replacement, avoiding premature or late replacement. During glue gun mixing tube replacement, the clamping mechanism ensures the clamping force between the upper and lower modules, ensuring that the upper and lower modules are properly clamped and avoiding inadequate tightening when manually replacing the glue gun mixing tube.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a top view of the structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of this utility model from below;

[0024] Figure 4 This is an exploded view of the overall structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the tooling table in this utility model.

[0026] Legend:

[0027] 1. Frame; 101. Slide rail; 102. Horizontal plate; 2. Clamping mechanism; 3. Tooling table; 301. Placement hole; 302. Positioning plate; 4. Robotic arm; 5. Glue gun mixing tube; 6. Clamping block; 7. Upper connector; 8. Lower connector; 9. Positioning pin; 10. Manifold; 11. Slider; 12. Positioning block; 13. Floating connector; 14. Clamping block; 15. Glue outlet; 16. Glue outlet block. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0029] Please see Figure 1-5 This utility model provides a technical solution: a glue gun mixing tube replacement mechanism, including an upper module, a lower module, a frame 1, a clamping mechanism 2, a tooling table 3, and a robotic arm 4; the upper module is used to connect the glue supply line, and the lower module is used to connect the glue gun mixing tube 5. The upper module and the lower module are used to dock to introduce glue from the glue supply line into the glue gun mixing tube 5; an installation space is formed in the frame 1, the upper module is slidably set in the installation space, and the lower module is used to slide into the installation space and enter the sliding stroke of the upper module, or to leave the installation space and leave the sliding stroke of the upper module. A clamping block 6 is formed in the installation space to abut against the lower module to prevent the lower module from disengaging from the installation space in the sliding direction of the upper module; the clamping mechanism 2 is set on the frame 1 to drive the upper module to slide in the installation space; a plurality of positioning seats are formed on the tooling table 3 for placing and positioning the lower module. The positioning seats are also used to limit the lower module in the direction in which the lower module slides into and out of the installation space; the robotic arm 4 is used to connect to the frame 1 or the upper module to drive the frame 1 and the upper module to move.

[0030] like Figure 1 As shown, the upper module is slidably set in the installation space formed within the frame 1, and the lower module can slide into or out of the installation space and the upper module's sliding stroke. When the lower module slides into the installation space and the upper module's sliding stroke, the upper module slides towards the lower module within the installation space and comes into contact with the lower module. At the same time, the installation space is equipped with a clamping block 6 to prevent the lower module from detaching from the installation space in the sliding direction of the upper module. That is to say, after the upper module slides along its own sliding direction and comes into contact with the lower module, it can press the lower module into the installation space formed within the frame 1, completing the docking between the upper and lower modules. The upper module is connected to the glue supply line, and the lower module is connected to the glue gun mixing tube 5. After the upper and lower modules are docked, the upper and lower modules can introduce the glue in the glue supply line into the glue gun mixing tube 5. Then, the frame 1 and the upper module are moved by the robotic arm 4. At this time, the lower module will move synchronously with the frame 1 and the upper module, thereby moving the glue gun mixing tube 5 to achieve the glue application operation.

[0031] The clamping mechanism 2 is used to drive the upper module to slide within the installation space, thereby enabling the upper module to dock with and disengage from the lower module;

[0032] When it is necessary to replace the glue gun mixing tube 5, simply drive the clamping mechanism 2 to move the upper module away from the lower module, causing the upper and lower modules to disengage. Since the lower module has lost the clamping force of the upper module, it can slide within the installation space to leave the installation space. At this time, the robotic arm 4 moves the frame 1, which in turn moves the lower module into the positioning seat. The positioning seat restricts the movement of the lower module in and out of the installation space. Subsequently, the robotic arm 4 drives the frame 1 to move in the opposite direction of the lower module leaving the installation space, causing the lower module to detach from the installation space. This completes the disassembly of the lower module and the glue gun mixing tube 5. Next, the new lower module needs to be docked with the upper module. The new lower module is placed on another positioning seat on the tooling table 3 and moved by the mechanical arm 4 to drive the frame 1 to enter the installation space. Then, the clamping mechanism 2 drives the upper module to move to the new lower module to realize the docking of the upper module and the new lower module, thereby completing the fully automatic replacement of the glue gun mixing tube 5. This can greatly improve the replacement efficiency of the glue gun mixing tube 5, reduce the labor intensity of the workers, and strictly ensure the replacement frequency of the glue gun mixing tube 5, avoiding the glue gun mixing tube 5 being replaced too early or too late. When replacing the glue gun mixing tube 5, the clamping mechanism 2 can ensure the clamping force between the upper module and the lower module, ensuring that the upper module and the lower module are clamped in place, avoiding the problem of insufficient tightening when manually replacing the glue gun mixing tube 5.

[0033] Specifically, in this example, a mounting space is formed within the frame 1 for the upper module to slide vertically within it. The upper module slides vertically within this mounting space. A clamping block 6 is located at the bottom of the mounting space, preventing the lower module from moving downwards out of the mounting space. Thus, the lower module can only enter and leave the mounting space horizontally. The pressing mechanism 2 drives the upper module to slide vertically within the mounting space, allowing it to press down on the lower module. When replacing the lower module, the lower module is first moved from the mounting space to the positioning seat by moving the frame 1. Since the lower module moves horizontally into and out of the mounting space, therefore... The positioning seat needs to restrict the horizontal movement of the lower module. At this time, the upper module and the lower module separate. Then, the frame 1 moves horizontally to detach the lower module from the installation space. Since it is the frame 1 that moves to detach the lower module from the installation space, the direction of movement of the frame 1 needs to be opposite to the direction in which the lower module leaves the installation space. For example, if the lower module needs to move forward to leave the installation space, the frame 1 needs to move backward so that the lower module moves forward relative to the frame 1. Next, the frame 1 moves to the side of the new lower module. The horizontal movement of the frame 1 allows the new lower module to enter the installation space. Then, the upper module descends and presses the lower module, realizing the replacement of the glue gun mixing tube 5.

[0034] Specifically, the upper module includes a sliding part and an upper connector 7 fixedly connected to the sliding part, and the lower module includes a lower connector 8 and a positioning pin 9. The positioning pin 9 is fixedly disposed on the lower connector 8 and is used to engage with the positioning hole opened in the upper connector 7 to position the upper connector 7 and the lower connector 8.

[0035] like Figure 1 As shown, when the upper module presses against the lower module and docks with the lower module, the upper connector 7 will dock with the lower connector 8. At the same time, the positioning pin 9 on the lower connector 8 will be inserted into the positioning hole opened in the upper connector 7 to ensure the accuracy of the docking of the upper connector 7 and the lower connector 8 and to prevent misalignment when the upper connector 7 and the lower connector 8 dock.

[0036] Specifically, the sliding part includes a manifold 10 and a slider 11. The slider 11 is slidably disposed in the installation space formed in the frame 1. The slider 11 is used to be fixedly connected to the robotic arm 4. The manifold 10 is fixedly connected to the slider 11 and is used to connect the glue supply line. The upper connector 7 is fixedly connected to the manifold 10.

[0037] like Figure 4As shown, the sliding part includes a slider 11 and a manifold 10. The slider 11 is slidably disposed in the installation space, and the manifold 10 is used to connect the glue supply line. The slider 11 is fixedly connected to the robotic arm 4. When the clamping mechanism 2 drives the sliding part to slide in the installation space, since the slider 11 is fixedly connected to the robotic arm 4, the actual movement is caused by the frame 1. The movement of the frame 1 causes the slider 11 to slide in the installation space. The glue supply line is connected from the robotic arm 4 to the manifold 10. The robotic arm 4 and the slider 11 always remain relatively stationary, so that the glue supply line and the manifold 10 can also always remain relatively stationary, so as to ensure the connection stability between the glue supply line and the manifold 10 and prevent the connection position between the glue supply line and the manifold 10 from becoming loose.

[0038] Specifically, robotic arm 4 employs conventional techniques in this field. Figure 2 The diagram only shows a partial structural diagram of its connection with the upper module.

[0039] Specifically, the frame 1 includes two parallel slide rails 101 and a horizontal plate 102 fixedly connected to the slide rails 101. An installation space is formed between the two slide rails 101. The sliding part is slidably disposed between the two slide rails 101 and slides with the two slide rails 101. Each of the two slide rails 101 is provided with a clamping block 6 on the side for sliding with the sliding part.

[0040] like Figure 1 As shown, the sliding part is slidably disposed between two slide rails 101. The sliding part is restricted by the two slide rails 101 to ensure the stability of the sliding part during the sliding process and to ensure the accuracy of the sliding part during the sliding process.

[0041] Furthermore, the clamping block 6 is located at the end of the slide rail 101 away from the horizontal plate 102. When replacing the lower module, the clamping block 6 needs to be lowered to the bottom of the lower module so that the clamping block 6 is close to the bottom of the slide rail 101. This can prevent the slide rail 101 from interfering with the tooling table 3 and ensure that the clamping block 6 can be lowered into place.

[0042] Furthermore, a positioning block 12 is fixedly provided on the side of the clamping block 6. The positioning block 12 is used to abut against the lower module to position the lower module in the installation space.

[0043] like Figure 3 As shown, a positioning block 12 is fixedly provided on the side of the clamping block 6. After the lower module enters the installation space, the two clamping blocks 6 position the lower module from the left and right directions. A positioning block 12 is fixedly provided on the rear side of the clamping block 6. After the lower module enters the installation space and abuts against the positioning block 12, the lower module can be positioned from the front and back directions to ensure that the position of the lower module is accurate after entering the installation space, and to ensure the precise docking of the upper and lower modules.

[0044] Specifically, the clamping mechanism 2 includes a cylinder, which is fixedly mounted on the horizontal plate 102, and the piston rod of the cylinder is fixedly connected to the upper module.

[0045] like Figure 1 As shown, in this example, the clamping mechanism 2 includes a cylinder, which is fixed on the horizontal plate 102, and the piston rod of the cylinder is fixedly connected to the upper module. The upper module slides in the installation space by extending or retracting the piston rod of the cylinder. When the robotic arm 4 is fixedly connected to the frame 1, the cylinder can directly drive the upper module to slide in the installation space. When the robotic arm 4 is fixedly connected to the upper module, the retraction of the piston rod of the cylinder will cause the frame 1 to descend, and the extension of the piston rod of the cylinder will cause the frame 1 to rise. The movement of the frame 1 is used to achieve the sliding of the upper module in the installation space.

[0046] Furthermore, a floating joint 13 is fixedly installed on the piston rod of the cylinder. The floating joint 13 is fixedly connected to the upper module. The floating joint 13 can absorb the installation deviation of the upper module or the cylinder within a certain angle, ensuring that the overall device can be used stably.

[0047] Specifically, such as Figure 1 As shown, a clamping block 14 is fixedly installed on the upper module. The clamping block 14 is used to press the floating joint 13 against the surface of the upper module, so as to...

[0048] The positioning base includes a placement hole 301 and a positioning plate 302. The placement hole 301 is opened on the tooling table 3 and is used to place the glue gun mixing tube 5. The positioning plate 302 is fixed on the tooling table 3 and is used to abut against the lower module to position the lower module at an angle.

[0049] like Figure 5 As shown, the positioning base includes a placement hole 301 and a positioning plate 302. The tooling table 3 has a placement hole 301 and the positioning plate 302 is fixed to the side of the placement hole 301. The glue gun mixing tube 5 can be inserted into the placement hole 301 from top to bottom. Since the glue gun mixing tube 5 is cylindrical, the lower module needs to be positioned at an angle by the positioning plate 302. The positioning plate 302 fits against the side of the lower module to achieve angular positioning of the lower module and the glue gun mixing tube 5.

[0050] Furthermore, the end of the glue gun mixing tube 5 used to connect with the lower connector 8 is a reducing section. The diameter of the reducing section gradually decreases from the end of the glue gun mixing tube 5 near the lower connector 8 to the end away from the lower connector 8. The shape of the placement hole 301 matches the shape of the reducing section, and the diameter of the top of the placement hole 301 matches the diameter of the middle position of the reducing section, so as to prevent the glue gun mixing tube 5 from completely entering the placement hole 301.

[0051] like Figure 3-5As shown, the upper outer surface of the glue gun mixing tube 5 is a variable diameter section. The placement hole 301 can be set to the same shape according to the characteristics of the variable diameter section, but the maximum diameter of the placement hole 301 is matched with the diameter of the middle part of the variable diameter section. In this way, the glue gun mixing tube 5 cannot be completely inserted into the placement hole 301, and the upper part of the glue gun mixing tube 5 will exceed the placement hole 301, so that a gap is created between the lower module and the top surface of the tooling table 3, so that the clamping block 6 can move horizontally to the bottom of the lower module. There is no need to set up an additional structure to lift the lower module and suspend the lower module, making the structure of the positioning seat simpler.

[0052] Furthermore, a glue dispensing head 15 is fixedly installed at the bottom of the glue gun mixing tube 5. The glue dispensing head 15 is used to precisely control the glue flow rate and stabilize the glue shape.

[0053] Specifically, a glue dispensing block 16 is fixedly installed at the lower end of the manifold 10. The bottom end of the glue dispensing block 16 is used to connect with the glue gun mixing tube 5. After the upper connector 7 and the lower connector 8 are connected, the glue dispensing block 16 will be connected with the glue gun mixing tube 5, thereby sending the glue in the manifold 10 into the glue gun mixing tube 5. The upper connector 7 and the lower connector 8 are used to ensure the connection accuracy between the glue dispensing block 16 and the glue gun mixing tube 5.

[0054] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A glue gun mixing tube replacement mechanism, characterized in that: It includes an upper module, a lower module, a frame (1), a clamping mechanism (2), a tooling table (3), and a robotic arm (4); The upper module is used to connect the glue supply line, and the lower module is used to connect the glue gun mixing tube (5). The upper module and the lower module are used to dock to introduce the glue in the glue supply line into the glue gun mixing tube (5). An installation space is formed within the frame (1). The upper module is slidably disposed within the installation space. The lower module is used to slide into the installation space and into the sliding stroke of the upper module, or to leave the installation space and leave the sliding stroke of the upper module. A clamping block (6) is formed within the installation space to abut against the lower module to prevent the lower module from disengaging from the installation space in the sliding direction of the upper module. The clamping mechanism (2) is mounted on the frame (1) and is used to drive the upper module to slide within the installation space; The tooling table (3) has multiple positioning seats for placing and positioning the lower module. The positioning seats are also used to limit the lower module in the direction in which the lower module slides into and out of the installation space. The robotic arm (4) is used to connect to the frame (1) or the upper module to drive the frame (1) and the upper module to move.

2. The glue gun mixing tube replacement mechanism according to claim 1, characterized in that: The upper module includes a sliding part and an upper connector (7) fixedly connected to the sliding part. The lower module includes a lower connector (8) and a positioning pin (9). The positioning pin (9) is fixedly disposed on the lower connector (8). The positioning pin (9) is used to engage with the positioning hole opened in the upper connector (7) to position the upper connector (7) and the lower connector (8).

3. The glue gun mixing tube replacement mechanism according to claim 2, characterized in that: The sliding part includes a manifold (10) and a slider (11). The slider (11) is slidably disposed in the installation space formed in the frame (1). The slider (11) is used to be fixedly connected to the robotic arm (4). The manifold (10) is fixedly connected to the slider (11) and is used to connect the glue supply line. The upper connector (7) is fixedly connected to the manifold (10).

4. The glue gun mixing tube replacement mechanism according to claim 2, characterized in that: The frame (1) includes two parallel slide rails (101) and a horizontal plate (102) fixedly connected to the slide rails (101). An installation space is formed between the two slide rails (101). The sliding part is slidably disposed between the two slide rails (101) and slides in cooperation with the two slide rails (101). Each of the two slide rails (101) is provided with a clamping block (6) on the side for sliding cooperation with the sliding part.

5. The glue gun mixing tube replacement mechanism according to claim 4, characterized in that: The clamping block (6) is located at the end of the slide rail (101) away from the horizontal plate (102).

6. The glue gun mixing tube replacement mechanism according to claim 1, characterized in that: A positioning block (12) is fixedly provided on the side of the clamping block (6). The positioning block (12) is used to abut against the lower module to position the lower module in the installation space.

7. The glue gun mixing tube replacement mechanism according to claim 1, characterized in that: The pressing mechanism (2) includes a cylinder, which is fixedly installed on the horizontal plate (102), and the piston rod of the cylinder is fixedly connected to the upper module.

8. The glue gun mixing tube replacement mechanism according to claim 7, characterized in that: A floating joint (13) is fixedly installed on the piston rod of the cylinder, and the floating joint (13) is fixedly connected to the upper module.

9. The glue gun mixing tube replacement mechanism according to claim 1, characterized in that: The positioning seat includes a placement hole (301) and a positioning plate (302). The placement hole (301) is opened on the tooling table (3) and is used to place the glue gun mixing tube (5). The positioning plate (302) is fixed on the tooling table (3) and is used to abut against the lower module to position the lower module at an angle.

10. A glue gun mixing tube replacement mechanism according to claim 9, characterized in that: The end of the glue gun mixing tube (5) that is connected to the lower connector (8) is a variable diameter section. The diameter of the variable diameter section gradually decreases from the end of the glue gun mixing tube (5) near the lower connector (8) to the end away from the lower connector (8). The shape of the placement hole (301) matches the shape of the variable diameter section, and the diameter of the top of the placement hole (301) matches the diameter of the middle position of the variable diameter section, so as to prevent the glue gun mixing tube (5) from completely entering the placement hole (301).

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