CN116111549A

CN116111549A - Dust explosion-proof electrostatic generator

Info

Publication number: CN116111549A
Application number: CN202310221825.5A
Authority: CN
Inventors: 刘兆兵
Original assignee: Foshan Delier Technology Co ltd
Current assignee: Foshan Delier Technology Co ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-05-12

Abstract

The utility model provides an explosion-proof electrostatic generator of dust, includes equipment main part, supplies powder device, spray gun controller and spray gun, supply the powder device to install in the rear portion of equipment main part, the spray gun controller is installed and is connected the powder device in the equipment main part, the spray gun is connected on supplying the powder device, be equipped with the electrostatic generator who is used for making the paint powder electrified on the spray gun controller, the electrostatic generator includes generator body, numerical control panel and wiring panel, be equipped with the preceding guard plate that is used for protecting numerical control panel and the back guard plate that is used for protecting the wiring panel on the spray gun controller, through setting up the protective component that is used for protecting the panel from external force impact in the outside of numerical control panel, the protective component includes the impact sheet, the impact sheet adopts the PC endurance board material after the hardening to make, and PC endurance board intensity is 250 times higher than traditional glass, and it is higher than 30 times of shock resistance board, and PC endurance board surface hardness through the hardening process treatment can reach 3H-4H, makes protective performance promote by a wide margin.

Description

Dust explosion-proof electrostatic generator

Technical Field

The invention relates to the technical field of electrostatic spraying, in particular to a dust explosion-proof electrostatic generator.

Background

Electrostatic spraying is a coating method which uses corona discharge principle to make atomized paint negatively charged under the action of high-voltage direct current electric field and adsorbed on the surface of positive charge substrate for discharge. The electrostatic spraying equipment consists of a spray gun, a spray cup, an electrostatic generator and the like.

The particle size range of powder coating particles is below 350 mu m, most of the particles are smaller than 75 mu m, the possibility of combustion explosion exists under certain conditions, therefore, in the application of powder spraying technology, explosion-proof measures are indispensable, for example, an electrostatic generator device disclosed in Chinese patent CN202022444609.1 comprises an electrostatic generator body, a placing hole is formed in the top end of the electrostatic generator body, the outer wall of an electrostatic generating head of the electrostatic generator body is movably arranged in the placing hole, a winding mechanism is arranged on the front surface of the electrostatic generating body, and a protection device is arranged at the positions of the electrostatic generating head and an instrument, so that the electrostatic generating head and the instrument can be protected from the impact of external force to a certain extent, but knob keys on the instrument are still easily damaged when being impacted by external force or falling on the ground, and even safety accidents caused by spark can be generated.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a dust explosion-proof electrostatic generator.

The technical scheme adopted for solving the technical problems is as follows:

the utility model provides an explosion-proof electrostatic generator of dust, includes equipment main part, supplies powder device, spray gun controller and spray gun, supply the powder device to install at the rear portion of equipment main part, spray gun controller installs on equipment main part and connects the powder device that supplies, the spray gun is connected on supplying the powder device, be equipped with on the spray gun controller and be used for making the electrified electrostatic generator of paint powder and be used for preventing the electrostatic generator internal element damage and produce the protection circuit of spark, the electrostatic generator includes generator body, numerical control panel and wiring panel, still be equipped with the preceding guard plate that is used for protecting numerical control panel and the back guard plate that is used for protecting the wiring panel on the spray gun controller, preceding guard plate includes protective frame and shock resistance piece, protective frame passes through the screw fixation on numerical control panel, shock resistance piece clamp is in the centre of protective frame and numerical control panel, the outside of shock resistance piece is equipped with the antistatic film that is used for preventing friction and produces static.

Further, the middle part of back guard plate is equipped with and holds the chamber, hold the chamber and be used for wrapping up the joint on the wiring panel, hold be equipped with on the chamber with connect the through-hole that the position corresponds, the backplate passes through the screw fixation on the wiring panel.

The protection circuit comprises a transformer, a rectification voltage-stabilizing circuit and an overload protection circuit, wherein the overload protection circuit is arranged at two ends of the transformer, the rectification voltage-stabilizing circuit is arranged at the output end of the transformer, the overload protection circuit consists of a thermistor and a thermal switch, the thermistor is arranged at the output end of the transformer, the thermal switch is arranged at the input end of the transformer, and the thermistor is used for controlling the opening and closing of the thermal switch.

Further, the rectifying and voltage stabilizing circuit comprises a rectifying bridge for converting high-voltage alternating current into high-voltage direct current, a filter capacitor for filtering alternating current wave bands and a voltage stabilizing diode for stabilizing circuit voltage, wherein the rectifying bridge is connected to the output end of the transformer, the filter capacitor is connected to the output end of the rectifying bridge in parallel, and the voltage stabilizing diode is connected to the output end of the rectifying bridge in parallel.

In the invention, the protection circuit further comprises an oscillating circuit for opening the main switch when the electrostatic generator is impacted or vibrated, the oscillating circuit comprises a vibration sensor and a release, the vibration sensor is connected to the release, the release is connected with an internal circuit, and the release is used for controlling the main switch to be closed.

The invention has the following advantages and effects:

1) The protection component for protecting the panel from external force is arranged on the outer side of the numerical control panel and comprises an impact-resistant sheet, the impact-resistant sheet is made of a hardened PC (polycarbonate) endurance plate material, the impact resistance of the PC endurance plate is 250 times higher than that of the traditional glass and 30 times higher than that of an acrylic plate, and the surface hardness of the PC endurance plate treated by a hardening process can reach 3H-4H, so that the protection performance is greatly improved;

2) The protection circuit comprises a transformer, a rectifying and voltage stabilizing circuit and an overload protection circuit, wherein the overload protection circuit is arranged at two ends of the transformer and consists of a thermistor and a thermal switch, the thermistor is arranged at the output end of the transformer, the thermal switch is arranged at the input end of the transformer and is used for controlling the opening and closing of the thermal switch, the thermistor adopts a positive temperature coefficient thermistor, the resistance value of the thermistor is increased in a step-like manner along with the increase of temperature, and when the internal circuit is in short circuit, the current is increased, and the heat quantity is according to Joule's law

The heating value of the thermistor can be increased, the resistance value of the thermistor can be increased along with the increase of the heat of the thermistor, and the current is reduced along with the increase of the resistor when the voltage is constant according to the formula U=IR, so that the condition that the components are damaged due to overhigh current is avoided.

Drawings

The invention is further described below with reference to the drawings and embodiments:

fig. 1 is a schematic view of an apparatus main body in the present embodiment;

fig. 2 is a circuit diagram of the protection circuit in the present embodiment;

fig. 3 is a circuit diagram of an overload protection circuit in the present embodiment;

FIG. 4 is a circuit diagram of a rectifying and voltage stabilizing circuit in the present embodiment;

FIG. 5 is a circuit diagram of an oscillating circuit in the present embodiment;

FIG. 6 is a disassembled view of the electrostatic generator of the present embodiment;

fig. 7 is a rear view of the electrostatic generator in the present embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and the present invention is not limited to the following embodiments.

As shown in fig. 1 to 7, the present embodiment discloses a dust explosion-proof electrostatic generator comprising an apparatus main body 1, a powder supply device 2, a gun controller 3 and a gun 4, the powder supply device 2 is installed at the rear of the apparatus main body 1, the gun controller 3 is installed on the apparatus main body 1 and connected with the powder supply device 2, the gun 4 is connected with the powder supply device 2, the gun controller 3 is provided with an electrostatic generator 31 for charging paint powder and a protection circuit 32 for preventing internal elements of the electrostatic generator 31 from being damaged to generate sparks, the protection circuit 32 comprises a transformer 321, a rectifying and voltage stabilizing circuit 322 and an overload protection circuit 323, the overload protection circuit 323 is arranged at two ends of the transformer 321, the rectifying and voltage stabilizing circuit 322 is arranged at the output end of the transformer 321, the overload protection circuit 323 is composed of a thermistor 323a and a thermosensitive switch 323b, the thermistor 323a is arranged at the output end of the transformer 321, the thermosensitive switch 323b is arranged at the input end of the transformer 321, the thermistor 323a is used for controlling the opening and closing of the thermosensitive switch 323b, preferably, the thermistor 323a adopts a positive temperature coefficient thermistor 323a, the resistance value of the thermistor is increased in a step-like manner along with the increase of the temperature, the current is increased when the internal circuit is in short circuit, and the heat quantity is increased according to Joule's law

It is known that the heat generation amount of the thermistor 323a is increased, and the resistance value of the thermistor 323a is increased along with the increase of the heat of the thermistor 323a, and the current is reduced along with the increase of the resistor when the voltage is constant according to the formula u=ir, so that the condition that the current is too high to damage components is avoided, the thermistor 323b adopts a normally closed movable contact type thermistor 323b, the normally closed switch is closed, the thermistor 323b is attached to the thermistor 323a for heat conduction, and when the temperature of the thermistor 323b is along with the temperature of the thermistor 323bWhen the temperature of the thermistor 323a is raised to a certain value, the thermal switch 323b is turned off, so that the internal circuit cuts off the power supply, and the internal components are prevented from being damaged to generate sparks.

In this embodiment, the rectifying and voltage stabilizing circuit 322 includes a rectifying bridge 322a for converting high-voltage ac into high-voltage dc, a filter capacitor 322b for filtering ac wave bands, and a voltage stabilizing diode 322c for stabilizing the voltage of the circuit, where the rectifying bridge 322a is connected to the output end of the transformer 321, the filter capacitor 322b is connected in parallel to the output end of the rectifying bridge 322a, and the voltage stabilizing diode 322c is connected in parallel to the output end of the rectifying bridge 322a, so that the voltage and current of the internal circuit are stabilized by the rectifying and voltage stabilizing circuit 322, and the phenomenon that the internal components are damaged due to voltage surges is avoided.

In this embodiment, the protection circuit 32 further includes an oscillating circuit 325 for opening the main switch 324 when the electrostatic generator 31 is impacted or vibrated, the oscillating circuit 325 includes a vibration sensor 325a and a release 325b, the vibration sensor 325a is connected to the release 325b, the release 325b is connected to an internal circuit, when the vibration sensor 325a detects a vibration signal, the oscillating circuit 325 is closed, and at this time, the release 325b controls the main switch 324 to be opened, preferably, the main switch 324 adopts an air switch, the main circuit can be manually closed, and when the electrostatic generator is impacted or vibrated severely, the internal circuit may be damaged, and at this time, the power supply is opened to avoid generating an electric spark.

In this embodiment, the electrostatic generator 31 includes a generator body 311, a nc panel 312 and a wiring panel 313, the gun controller 3 is further provided with a front protection plate 314 for protecting the nc panel 312 and a rear protection plate 315 for protecting the wiring panel 313, the front protection plate 314 includes a protection frame 314a and an impact-resistant sheet 314b, the protection frame 314a is fixed on the nc panel 312 by screws, the impact-resistant sheet 314b is clamped between the protection frame 314a and the nc panel 312, in order to prevent static electricity from being generated on the impact-resistant sheet 314b, preferably, an antistatic film for preventing static electricity from being generated by friction is disposed on the outer side of the impact-resistant sheet 314b, preferably, in order to prevent spark from being generated when the electrostatic generator 31 collides or falls, the protection frame 314a is formed by injection molding a hard plastic material, which may be TPE, TPU or the like.

Further, a receiving cavity 315a is provided in the middle of the rear protection plate 315, the receiving cavity 315a is used for wrapping the connector on the wiring panel 313, a through hole corresponding to the connector is provided in the receiving cavity 315a, and the protection plate is fixed on the wiring panel 313 by screws.

In this embodiment, the impact-resistant sheet 314b is made of a hardened PC endurance plate, and the process flow includes a PC endurance plate forming process and a PC endurance plate hardening process.

Further, the PC endurance plate forming process adopts PC particles to melt and then extrude and form, and an extrusion port adopts a flat extrusion head to obtain the PC plate, and specifically comprises the following steps:

1) The PC particles are fully dried, the water content of the PC particles is reduced to below 0.015-0.03% before molding, and the drying conditions are as follows: the temperature is 110-120 ℃ and the time is 8-12 hours; the PC particles are placed in an environment with the temperature of 110-120 ℃ for 8-12 hours, the PC particles are completely dehydrated, the boiling point of water is 100 ℃, the melting point of the PC particles is 220-230 ℃, and when the environment temperature is set at 110-120 ℃, the temperature of the PC particles can reach more than 100 ℃, at this time, the complete evaporation of water in the PC particles can be ensured, the melting or carbonization of the PC particles can be avoided, and the PC particles are fully dried under lower energy consumption output. The PC particles are sufficiently dried, so that the interference of moisture can be avoided in the subsequent working procedure, for example, the PC particles are carried out in a closed space during high-temperature melting and annealing treatment, if a large amount of moisture is contained in the PC particles, more water mist is generated in the corresponding processing space during the high-temperature melting and annealing treatment, and the water mist can cover the surface of a formed part, so that the surface of the formed part is dented, air bubbles, even cracked and the like; reduced mechanical properties such as impact resistance and tensile strength.

2) Melting at high temperature, namely heating the front section of the material pipe to 240-265 ℃ after the dried PC particles are sent into an extruder, heating the middle section of the material pipe to 260-280 ℃, and heating the rear section of the material pipe to 240-250 ℃; the viscosity of the PC particles after melting is sensitive to temperature, and the viscosity is obviously reduced when the temperature is increased, so that the temperature is set at 240-265 ℃ at the front section of the material pipe, the PC particles are fully and primarily melted, the temperature is increased to 260-280 ℃ when the material is positioned at the middle section of the material pipe, the viscosity of the PC material is reduced, the fluidity is improved, the PC material is stirred and fully plasticized at the middle section of the material pipe, then the PC material is sent into the rear section of the material pipe, the high-viscosity PC material has high strength and impact toughness, the temperature of the rear section of the material pipe is reduced to 240-250 ℃ to improve the viscosity of the PC material, and the temperature is set at 240-250 ℃ to ensure that the PC material is kept in a molten state in the material pipe, so that the PC material is convenient to extrude.

3) Annealing, namely annealing the formed part for 2 hours, wherein the annealing temperature is 120-135 ℃, and naturally cooling to room temperature; the formed PC board has larger internal stress, and the PC board is annealed for 2 hours to fully release the internal stress, thereby being beneficial to increasing the ductility and toughness of the PC board.

Further, the PC endurance plate hardening process adopts a surface coating process, and specifically comprises the following steps:

1) Cleaning the surface of the extruded PC board;

2) Spraying a hardening coating, and coating a hardening coating containing silicon, titanium and other components on the surface of the PC board;

3) And (5) drying, namely conveying the PC board into an oven for drying.

The PC board is subjected to surface hardening treatment, so that the advantages of the original PC board can be maintained, meanwhile, the surface of the PC board can be coated with a coating with higher hardness, the surface hardness is improved, the surface of the PC board has scratch resistance, and the strength and hardness of the PC board are further improved.

The above description is merely illustrative of the invention and those skilled in the art may make various modifications and additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides an explosion-proof electrostatic generator of dust, includes equipment main part (1), supplies powder device (2), spray gun controller (3) and spray gun (4), supply powder device (2) to install in the rear portion of equipment main part (1), spray gun controller (3) are installed on equipment main part (1) and are connected and supply powder device (2), spray gun (4) are connected on supplying powder device (2), its characterized in that: be equipped with on spray gun controller (3) be used for making electrostatic generator (31) that paint powder is electrified and be used for preventing that electrostatic generator (31) internal component from damaging and producing protection circuit (32) of spark, electrostatic generator (31) are including generator body (311), numerical control panel (312) and wiring panel (313), still be equipped with on spray gun controller (3) be used for protecting preceding guard plate (314) of numerical control panel (312) and be used for protecting back guard plate (315) of wiring panel (313), preceding guard plate (314) include guard frame (314 a) and impact sheet (314 b), guard frame (314 a) are fixed on numerical control panel (312) through the screw, impact sheet (314 b) clamp is in the centre of guard frame (314 a) and numerical control panel (312), the outside of impact sheet (314 b) is equipped with the antistatic backing that is used for preventing that friction from producing static.

2. A dust blast electrostatic generator as set forth in claim 1, wherein: the middle part of back guard plate (315) is equipped with holds chamber (315 a), hold chamber (315 a) and be used for wrapping up the joint on wiring panel (313), hold and be equipped with the through-hole that corresponds with the joint position on chamber (315 a), the backplate passes through the screw fixation on wiring panel (313).

3. A dust blast electrostatic generator as set forth in claim 1, wherein: the protection circuit (32) comprises a transformer (321), a rectification voltage stabilizing circuit (322) and an overload protection circuit (323), wherein the overload protection circuit (323) is arranged at two ends of the transformer (321), the rectification voltage stabilizing circuit (322) is arranged at the output end of the transformer (321), the overload protection circuit (323) consists of a thermistor (323 a) and a thermistor switch (323 b), the thermistor (323 a) is arranged at the output end of the transformer (321), the thermistor switch (323 b) is arranged at the input end of the transformer (321), and the thermistor (323 a) is used for controlling the opening and closing of the thermistor switch (323 b).

4. A dust blast electrostatic generator according to claim 3, wherein: the rectification voltage stabilizing circuit (322) comprises a rectification bridge (322 a) for converting high-voltage alternating current into high-voltage direct current, a filter capacitor (322 b) for filtering alternating current wave bands and a voltage stabilizing diode (322 c) for stabilizing circuit voltage, wherein the rectification bridge (322 a) is connected to the output end of the transformer (321), the filter capacitor (322 b) is connected to the output end of the rectification bridge (322 a) in parallel, and the voltage stabilizing diode (322 c) is connected to the output end of the rectification bridge (322 a) in parallel.

5. A dust blast electrostatic generator as set forth in claim 4, wherein: the protection circuit (32) further comprises an oscillating circuit (325) for opening the main switch (324) when the electrostatic generator (31) is impacted or vibrated, the oscillating circuit (325) comprises a vibration sensor (325 a) and a release (325 b), the vibration sensor (325 a) is connected to the release (325 b), the release (325 b) is connected to the internal circuit, and the release (325 b) is used for controlling the closing of the main switch (324).