A shotcrete pipe convenient for dismounting

Abstract

The utility model belongs to the technical field of artificial board production machinery, and relates to a shotcrete pipe convenient for dismounting of a glue gun, which comprises a shotcrete pipe body provided with a glue gun sleeve pipe, the glue gun sleeve pipe adopts a double-layer pipe structure to form a steam cavity and a purging channel, and is communicated through a steam hole. A steam supply system periodically supplies high-pressure steam to the steam cavity through a control valve group, the steam is sprayed to the purging channel through the steam hole, and the glue gun nozzle is cleaned on line. The shotcrete pipe disclosed by the utility model optimizes the connecting structure of the shotcrete pipe and the glue gun, integrates steam cleaning and auxiliary dismounting functions, realizes active prevention of glue gun blockage and simplification of dismounting operation, significantly improves production efficiency, reduces equipment maintenance cost, and has obvious economic benefits and practicality.

Description

Technical Field

[0001] This utility model belongs to the field of artificial board production machinery technology, and relates to glue guns and matching spraying devices used for gluing, and particularly to a spraying pipe that is easy to disassemble from the glue gun. Background Technology

[0002] In the continuous production of engineered wood products (such as fiberboard and particleboard), the gluing process is one of the key factors determining the quality of the boards. It requires the uniform injection of various materials, including glue, hardener, colorant, and paraffin dispersion, into the fibers through a spray nozzle. Current technology commonly involves inserting the glue gun nozzle directly into the vicinity of the spray nozzle to spray the materials. During production, the sprayed glue mixture with the high-speed flowing fibers easily adheres and accumulates around and at the base of the glue gun nozzle, forming a hard and highly adhesive solidified block due to the curing properties of the glue. This solidified block is highly adhesive, hard, and continuously thickens over production time, easily causing glue gun clogging and firmly bonding the connection between the glue gun and the spray nozzle.

[0003] When glue guns need replacement due to blockages or hose ruptures, the disassembly process is extremely difficult: traditional spray guns and spray nozzles are rigidly connected, lacking cleaning or assisted disassembly mechanisms. This problem leads to two major drawbacks: first, hardened blocks clog nozzles or alter the spray flow field, affecting the uniformity of glue application and ultimately reducing board quality; second, hardened blocks firmly bond the glue gun to the spray nozzle, making replacement and cleaning of the glue gun exceptionally difficult. Currently, the industry lacks effective online prevention methods, and disassembly generally relies on operators using sledgehammers, pry bars, and other tools for violent striking, which is not only time-consuming and labor-intensive (a single disassembly often exceeds 30 minutes), but also results in a scrap rate of over 15% for glue gun bending and thread damage, and even damage to the expensive spray nozzle itself. Frequent unplanned downtime and high spare parts consumption severely restrict production efficiency and economic benefits.

[0004] Currently, there is no dedicated cleaning and disassembly aid device for the connection between the spray nozzle and the glue gun in the industry. Existing improvements are mostly focused on the anti-clogging design of the glue gun itself, such as improving the nozzle shape or material. However, these are all passive defenses and cannot solve the disassembly problem after adhesion has occurred. They do not address the fundamental problem from the perspective of the spray nozzle structure. Therefore, there is an urgent need for a solution that starts from the spray nozzle structure, can actively prevent adhesion, and allows for easy disassembly of the glue gun during maintenance. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to disclose a spray pipe that facilitates the disassembly of a glue gun. The spray pipe integrates a steam cleaning function, which can remove the adhesive at the glue gun nozzle online, fundamentally preventing blockage and greatly reducing disassembly resistance.

[0006] Technical solution

[0007] A spray gun nozzle for easy disassembly includes a spray gun nozzle body and at least one spray gun mounting unit, wherein the spray gun mounting unit includes:

[0008] The glue gun sleeve is fixedly installed on the spray pipe body. The glue gun sleeve has a sandwich structure consisting of an outer tube and an inner tube arranged coaxially. The sealed cavity between the outer tube and the inner tube forms a steam chamber. The inner wall of the inner tube is used to cooperate with the outer wall of the inserted glue gun to form an annular steam purging channel.

[0009] A steam hole is formed on the wall of the inner tube to connect the steam chamber with the steam purging channel;

[0010] A steam supply system includes a rigid steam pipe connected to a steam chamber for supplying high-pressure steam to the steam chamber; the steam supply system is equipped with a control valve group for regulating the on / off state, pressure, and injection timing of the steam.

[0011] The glue gun connector has one end connected to the glue gun sleeve flange, and the other end has a structure that engages with the external thread of the glue gun and is locked by a nut, for detachably fixing the glue gun.

[0012] In a preferred embodiment of this utility model, when there are multiple glue gun mounting units, the steam chambers of the multiple glue gun sleeves are connected in series through the steam hard pipe.

[0013] In a preferred embodiment of this utility model, the diameter of the steam hole is 1-2 mm. Preferably, 3-4 steam holes are evenly distributed along the circumference of the inner tube.

[0014] In a preferred embodiment of this utility model, the control valve group includes an automatic control valve and a pressure regulating valve arranged sequentially along the steam flow direction. The automatic control valve is a pneumatic valve or a solenoid valve, configured to open and close according to a preset cycle.

[0015] In a preferred embodiment of this utility model, the opening and closing cycle of the automatic control valve is 8-15 minutes, the single opening duration is 5-8 seconds, and the working pressure maintained by the steam supply system is 0.4-0.6 MPa.

[0016] In a preferred embodiment of this utility model, the inner wall of the inner tube is further provided with a wear-resistant bushing, which is made of polytetrafluoroethylene material.

[0017] Maintenance and Installation Instructions

[0018] Installation requirements: When welding the glue gun sleeve and the spray pipe, coaxiality must be ensured to avoid deformation of the inner tube, which would make it difficult to insert the glue gun; the steam rigid pipe should be threaded and fitted with a sealing gasket to ensure no steam leakage.

[0019] Routine maintenance: Check the steam vents weekly for blockages; if blocked, clean them with a 0.8-1mm needle. Calibrate the opening and closing cycle of the automatic control valve monthly to ensure it matches the set value.

[0020] Precautions: The steam pressure must not exceed 0.6 MPa to avoid deformation of the inner tube due to high pressure; when changing the glue gun, ensure that there is no residual steam in the blowing channel to prevent burns.

[0021] The spray pipe for disassembling a glue gun disclosed in this utility model integrates steam cleaning and auxiliary disassembly functions. It can remove hardened mixture around the glue gun nozzle online, reducing clogging; soften residual adhering substances, reducing glue gun disassembly resistance and avoiding violent operation; and optimize the steam control method, taking into account both cleaning effect and energy consumption control.

[0022] Beneficial effects

[0023] The spray pipe disclosed in this utility model can self-clean online. High-pressure steam continuously flushes the glue gun nozzle through the purging channel, preventing the accumulation of mixtures and reducing the clogging rate by more than 90%. It can also be quickly disassembled; the steam softens residual adhering substances, shortening the disassembly time to within 5 minutes and avoiding glue gun failure caused by violent disassembly. It also adopts an energy-saving design, with periodic steam injection reducing energy consumption, and the series structure of the steam chambers ensuring uniform purging at each station. By optimizing the connection structure between the spray pipe and the glue gun, the disclosed spray pipe integrates steam cleaning and assisted disassembly functions, effectively solving the problems of difficult glue gun disassembly and high wear in the artificial board production line, and has significant economic benefits and practicality. Attached Figure Description

[0024] Figure 1 Cross-sectional view of the glue gun sleeve;

[0025] Figure 2 An installation diagram showing the connection of multiple glue gun sleeves in series via steam rigid pipes and the control system.

[0026] The components are labeled as follows: 1-Automatic control valve; 2-Pressure regulating valve; 3-Glue gun sleeve; 3a-Outer tube; 3b-Inner tube; 3c-Steam port; 4-Glue gun; 4a-Nozzle; 5-Steam rigid pipe; 6-Spraying pipe; A-Steam chamber; B-Steam purging channel; 7-Glue gun connector. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the embodiments, so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0028] Example 1

[0029] A spray gun that facilitates disassembly includes a spray gun body 6 and at least one spray gun mounting unit, wherein the spray gun mounting unit includes:

[0030] The glue gun sleeve 3 is fixedly installed on the body of the spray pipe 6. The glue gun sleeve 3 has a sandwich structure composed of an outer tube 3a and an inner tube 3b arranged coaxially. The sealed cavity between the outer tube 3a and the inner tube 3b forms a steam chamber A. The inner wall of the inner tube 3b is used to cooperate with the outer wall of the inserted glue gun to form an annular steam purging channel B.

[0031] Steam hole 3c is formed on the wall of the inner tube 3b and is used to connect the steam chamber A with the steam purging channel B.

[0032] A steam supply system includes a steam rigid pipe 5, which is connected to the steam chamber A and is used to supply high-pressure steam to the steam chamber A; the steam supply system is equipped with a control valve group for regulating the on / off state, pressure and injection timing of the steam.

[0033] The glue gun connector 7 has one end connected to the flange of the glue gun sleeve 3, and the other end has a structure that engages with the external thread of the glue gun 4 and is locked by a nut, for detachably fixing the glue gun 4.

[0034] Example 2

[0035] A spray gun that facilitates disassembly includes a spray gun body 6 and at least one spray gun mounting unit, wherein the spray gun mounting unit includes:

[0036] The glue gun sleeve 3 is fixedly installed on the body of the spray pipe 6. The glue gun sleeve 3 has a sandwich structure composed of an outer tube 3a and an inner tube 3b arranged coaxially. The sealed cavity between the outer tube 3a and the inner tube 3b forms a steam chamber A. The inner wall of the inner tube 3b is used to cooperate with the outer wall of the inserted glue gun to form an annular steam purging channel B.

[0037] Steam holes 3c are formed on the wall of the inner tube 3b and are used to connect the steam chamber A with the steam purging channel B. The diameter of the steam holes 3c is 1-2 mm and 3-4 are evenly distributed along the circumference of the inner tube 3b.

[0038] A steam supply system includes a steam rigid pipe 5, which is connected to the steam chamber A and is used to supply high-pressure steam to the steam chamber A; the steam supply system is equipped with a control valve group for regulating the on / off state, pressure and injection timing of the steam.

[0039] The glue gun connector 7 has one end connected to the flange of the glue gun sleeve 3, and the other end is provided with a structure that engages with the external thread of the glue gun 4 and is locked by a nut, for detachably fixing the glue gun 4;

[0040] When there are multiple glue gun mounting units, the steam chambers A of the multiple glue gun sleeves 3 are connected in series through the rigid pipes 5.

[0041] Example 3

[0042] A spray gun that facilitates disassembly includes a spray gun body 6 and at least one spray gun mounting unit, wherein the spray gun mounting unit includes:

[0043] The glue gun sleeve 3 is fixedly installed on the body of the spray pipe 6. The glue gun sleeve 3 has a sandwich structure composed of an outer tube 3a and an inner tube 3b arranged coaxially. The sealed cavity between the outer tube 3a and the inner tube 3b forms a steam chamber A. The inner wall of the inner tube 3b is used to cooperate with the outer wall of the inserted glue gun to form an annular steam purging channel B.

[0044] Steam holes 3c are formed on the wall of the inner tube 3b and are used to connect the steam chamber A with the steam purging channel B. The diameter of the steam holes 3c is 1-2 mm and 3-4 are evenly distributed along the circumference of the inner tube 3b.

[0045] A steam supply system includes a rigid steam pipe 5 connected to a steam chamber A for supplying high-pressure steam to the steam chamber A. The steam supply system is equipped with a control valve assembly for regulating the steam's on / off state, pressure, and injection timing. The control valve assembly includes an automatic control valve 1 and a pressure regulating valve 2 arranged sequentially along the steam flow direction. The automatic control valve 1 is a pneumatic valve or a solenoid valve, configured to open and close according to a preset cycle of 8-15 minutes, with a single opening duration of 5-8 seconds. The steam supply system maintains a working pressure of 0.4-0.6 MPa.

[0046] The glue gun connector 7 has one end connected to the flange of the glue gun sleeve 3, and the other end is provided with a structure that engages with the external thread of the glue gun 4 and is locked by a nut, for detachably fixing the glue gun 4;

[0047] When there are multiple glue gun mounting units, the steam chambers A of the multiple glue gun sleeves 3 are connected in series through the rigid pipes 5.

[0048] Example 4

[0049] A spray gun that facilitates disassembly includes a spray gun body 6 and at least one spray gun mounting unit, wherein the spray gun mounting unit includes:

[0050] The glue gun sleeve 3 is fixedly installed on the spray pipe 6 body. The glue gun sleeve 3 has a sandwich structure composed of an outer tube 3a and an inner tube 3b arranged coaxially. The sealed cavity between the outer tube 3a and the inner tube 3b forms a steam chamber A. The inner wall of the inner tube 3b is used to cooperate with the outer wall of the inserted glue gun to form an annular steam purging channel B. The inner wall of the inner tube 3b is also embedded with a wear-resistant bushing, which is made of polytetrafluoroethylene material.

[0051] Steam holes 3c are formed on the wall of the inner tube 3b and are used to connect the steam chamber A with the steam purging channel B. The diameter of the steam holes 3c is 1-2 mm and 3-4 are evenly distributed along the circumference of the inner tube 3b.

[0052] A steam supply system includes a rigid steam pipe 5 connected to a steam chamber A for supplying high-pressure steam to the steam chamber A. The steam supply system is equipped with a control valve assembly for regulating the steam's on / off state, pressure, and injection timing. The control valve assembly includes an automatic control valve 1 and a pressure regulating valve 2 arranged sequentially along the steam flow direction. The automatic control valve 1 is a pneumatic valve or a solenoid valve, configured to open and close according to a preset cycle of 8-15 minutes, with a single opening duration of 5-8 seconds. The steam supply system maintains a working pressure of 0.4-0.6 MPa.

[0053] The glue gun connector 7 has one end connected to the flange of the glue gun sleeve 3, and the other end is provided with a structure that engages with the external thread of the glue gun 4 and is locked by a nut, for detachably fixing the glue gun 4;

[0054] When there are multiple glue gun mounting units, the steam chambers A of the multiple glue gun sleeves 3 are connected in series through the rigid pipes 5.

[0055] Example 5

[0056] A medium-density fiberboard (MDF) production line with an annual output of 200,000 cubic meters uses the spray pipe of this utility model for its sizing system.

[0057] 6 parameters of the spray pipe: diameter 300mm, wall thickness 8mm, material 304 stainless steel (strong corrosion resistance, suitable for sizing environments containing chemical materials).

[0058] Glue gun installation unit: 8 sets in total, welded at 400mm intervals along the length of the spray pipe;

[0059] Parameters of glue gun sleeve 3: Inner tube 3b inner diameter 25mm, steam hole 3c diameter 1.5mm, three evenly distributed in a 120° ring;

[0060] Steam supply system: The steam pressure is set to 0.5MPa through pressure regulating valve 2. Automatic control valve 1 is controlled by the production line PLC and opens once every 10 minutes, each time for 6 seconds (timing control accuracy ±0.5s).

[0061] Disassembly procedure: Close the feed valve 4 of the glue gun → loosen the locking nut → gently pull out the glue gun directly. No tools are required throughout the process.

[0062] Instructions for use: After the production line is started, the online cleaning method will run automatically. After 720 hours of continuous operation, an inspection showed no obvious hardened deposits at nozzle 4a of the glue gun, and the residue thickness was less than 0.1mm. When it is necessary to replace the glue gun, the operator only needs to close the feed ball valve and loosen the nut by hand to easily pull out the glue gun. The entire process requires no tools and takes less than 3 minutes.

[0063] Operational results: After 720 hours of continuous operation, the nozzle residue thickness is ≤0.1mm, the steam hole unobstructed rate is 100%, the single disassembly time is <5min, the glue gun scrap rate is <1%, and the monthly downtime is 0.5h.

[0064] In comparison, traditional spraying pipes have a single disassembly time of >30 minutes, a glue gun scrap rate of 15%, and a monthly downtime of 8 hours.

[0065] Example 6

[0066] This invention is implemented in the gluing system of a particleboard production line where the fibers are coarser and the wear is more severe.

[0067] Structural improvement: A polytetrafluoroethylene (PTFE) wear-resistant bushing is pressed into the inner wall of the inner tube 3b of the glue gun sleeve 3 to adapt to the high abrasion environment caused by the coarse fibers of particleboard.

[0068] Control optimization: Because particleboard material is more prone to adhesion, the blowing cycle of automatic control valve 1 is shortened to once every 8 minutes, with an opening time of 6 seconds, in order to increase the cleaning frequency.

[0069] Operational results: The measured axial force required for disassembling the glue gun is approximately 80N, which is far lower than the 500N of the traditional structure. The glue gun replacement scrap rate is less than 1%, perfectly matching the high-strength production requirements of the particleboard production line.

[0070] The above-described embodiments are merely specific implementations of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the description of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A spray pipe for easy disassembly of a glue gun, comprising a spray pipe (6) body and at least one glue gun mounting unit, characterized in that, The glue gun mounting unit includes: The glue gun sleeve (3) is fixedly installed on the body of the spray pipe (6). The glue gun sleeve (3) has a sandwich structure composed of an outer tube (3a) and an inner tube (3b) arranged coaxially. The sealed cavity between the outer tube (3a) and the inner tube (3b) forms a steam chamber (A). The inner wall of the inner tube (3b) is used to cooperate with the outer wall of the inserted glue gun and form an annular steam purging channel (B). A steam hole (3c) is formed on the wall of the inner tube (3b) to connect the steam chamber (A) with the steam purging channel (B); The steam supply system includes a steam hard pipe (5) connected to the steam chamber (A) for supplying high-pressure steam to the steam chamber (A); the steam supply system is equipped with a control valve group for regulating the on / off state, pressure and injection timing of the steam. The glue gun connector (7) is connected to the flange of the glue gun sleeve (3) at one end and has a structure that engages with the external thread of the glue gun (4) and is locked by a nut at the other end, for detachably fixing the glue gun (4).

2. The spray pipe for easy disassembly of the glue gun according to claim 1, characterized in that: When there are multiple glue gun mounting units, the steam chambers (A) of multiple glue gun sleeves (3) are connected in series through the steam hard pipe (5).

3. The spray pipe for easy disassembly of the glue gun according to claim 1, characterized in that: The diameter of the steam pore (3c) is 1-2 mm.

4. The spray pipe for easy disassembly of the glue gun according to claim 1, characterized in that: The steam pores (3c) are evenly distributed in 3-4 along the circumference of the inner tube (3b).

5. The spray pipe for easy disassembly of the glue gun according to claim 1, characterized in that: The control valve group includes an automatic control valve (1) and a pressure regulating valve (2) arranged sequentially along the steam flow direction. The automatic control valve (1) is a pneumatic valve or a solenoid valve, which is configured to open and close according to a preset cycle.

6. The spray pipe for easy disassembly of the glue gun according to claim 5, characterized in that: The opening and closing cycle of the automatic control valve (1) is 8-15 minutes, and the single opening time is 5-8 seconds.

7. The spray pipe for easy disassembly of the glue gun according to claim 1, characterized in that: The inner wall of the inner tube (3b) is also fitted with a wear-resistant bushing, which is made of polytetrafluoroethylene material.

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