KR102450187B1 - Undercoating method for construction machinery - Google Patents

Abstract

The present invention is a storage step (S10) in which the construction machinery is stocked; a loading device separation step of separating the utility from the construction machine (S20); A sanding pre-processing step (S30) of removing at least one of paint or rust from the utility-separated construction machine; and an undercoating step (S40) of applying an undercoating agent to the surface from which the paint or rust has been removed.
The present invention removes at least any one of paint or rust formed on the surface of the main frame and the subframe that supports the utility of the construction machine, and then performs undercoating. have.

Description

Undercoating method for construction machinery

The present invention relates to a method for undercoating a construction machine.

Since the lower part of the vehicle body during driving is directly exposed to adverse conditions, undercoating is performed for the purpose of corrosion prevention, dustproofing, soundproofing, heat dissipation, and rust prevention.

Components of the conventional coating agent for undercoating can be largely divided into oil-based undercoating agents and water-based undercoating agents.

Oil-based undercoating agents are tar-based and contain toxic substances that cause environmental pollution. Most of these oil-based undercoating agents have a rust-preventive (corrosion prevention) function, and properties and durability may vary depending on ingredients and mixing ratios.

For example, if the composition is incorrect and complete curing is not achieved, it is a factor that further increases contamination of the bottom due to stickiness, and if it is made hard, peeling occurs, so durability may be significantly reduced.

However, conventional undercoating has been used to coat the underside of passenger cars.

In the case of commercial vehicles such as trucks of 2.5 tons or more, there was a problem in that the surface of the vehicle was corroded as the painted paint fell off because the mileage was long and the vehicle was driven in a harsh environment.

Republic of Korea Patent Publication No. 10-1994117

An object of the present invention is to provide a method for undercoating a construction machine.

The present invention is a commercial vehicle stocked step (S10); a loading device separation step of separating the utility from the commercial vehicle (S20); A sanding pretreatment step (S30) of removing at least one of paint or rust from the commercial vehicle in which the utility is separated; and an undercoating step (S40) of applying an undercoating agent to the surface from which the paint or rust has been removed.

Air compressor 10 for compressing air through the applied power; Water pump 20 for compressing water through the applied power; an air tank 30 connected to the air compressor 10 to receive compressed air and to store the compressed air; a storage tank 50 that is connected to the air tank 30 to selectively receive compressed air, is connected to the water pump 20 to selectively receive compressed water, and stores the injection material; a discharge hose 60 through which the injection material 40 discharged from the storage tank 50 is moved; It is coupled to the discharge hose 60 and the nozzle 70 to which water, air, and a spray material is sprayed; further comprising a water sandblasting comprising; the sanding pre-treatment step is water including the water, air, and the spray material. At least one of the paint and rust may be removed through sand.

a first connection pipe 110 for connecting the air tank 30 and the storage tank 50; a second connection pipe 120 connecting the water pump 20 and the storage tank 50; a third connection pipe 130 for connecting the storage tank 50 and the discharge hose 60; a fourth connecting pipe 140 connecting the air tank 30 and the third connecting pipe 130; a first valve disposed on the first connection pipe and opening and closing the first connection pipe; a second valve disposed on the second connection pipe and configured to open and close the second connection pipe; a third valve disposed on the third connection pipe and configured to open and close the third connection pipe; It is disposed on the fourth connection pipe, the first valve for opening and closing the fourth connection pipe; further comprising, in the sanding pre-processing step 30, the air compressor 10 and the water pump 30 are operated ( on) the step (S31) (S32); after the step S31, opening the first to fourth valves (S33) (S34) (S35) (S36); a rust removal step (S37) of spraying the water sand sprayed from the nozzle (70) on the surfaces of the main frame (6') and subframe (8) of the commercial vehicle after the steps S33 to S36; closing the first to fourth valves after the rust removing step (S37) (S133) (S134) (S135) (S136); The drying step (S38) carried out after the S133 to S136; may include.

Opening and closing of the first to fourth valves may be controlled through a switch disposed on the nozzle.

The present invention is an air compressor (10) for compressing air through the applied power; Water pump 20 for compressing water through the applied power; an air tank 30 connected to the air compressor 10 to receive compressed air and to store the compressed air; a storage tank 50 that is connected to the air tank 30 to selectively receive compressed air, is connected to the water pump 20 to selectively receive compressed water, and stores the injection material; a discharge hose 60 through which the injection material 40 discharged from the storage tank 50 is moved; a nozzle 70 coupled to the discharge hose 60 to which water, air, and a spray material are sprayed; a first connection pipe 110 for connecting the air tank 30 and the storage tank 50; a second connection pipe 120 connecting the water pump 20 and the storage tank 50; a third connection pipe 130 for connecting the storage tank 50 and the discharge hose 60; a fourth connecting pipe 140 connecting the air tank 30 and the third connecting pipe 130; a first valve disposed on the first connection pipe and opening and closing the first connection pipe; a second valve disposed on the second connection pipe and configured to open and close the second connection pipe; a third valve disposed on the third connection pipe and configured to open and close the third connection pipe; a fourth valve disposed on the fourth connection pipe and opening and closing the fourth connection pipe;

A stocking step (S10) of wearing a commercial vehicle; Lifting the loading box using the hydraulic system of the dump truck (S25); A sanding pre-processing step of removing at least one of paint or rust from the commercial vehicle in which the loading box is lifted (S30); Including; an undercoating step (S40) of applying an undercoating agent to the surface from which the paint or rust has been removed, and the sanding pretreatment step 30, the air compressor 10 and the water pump 30 are operated (on) step (S31) (S32); after the step S31, opening the first to fourth valves (S33) (S34) (S35) (S36); a rust removal step (S37) of spraying the water sand sprayed from the nozzle (70) on the surfaces of the main frame (6') and subframe (8) of the commercial vehicle after the steps S33 to S36; closing the first to fourth valves after the rust removing step (S37) (S133) (S134) (S135) (S136); Drying step (S38) performed after the S133 to S136; and the sanding pre-treatment step can remove at least one of the paint or rust through the water sand containing the water, air, and spraying material. have.

First, the present invention removes at least any one of paint or rust formed on the surface of the main frame and the sub-frame supporting the utility of the construction machine, and then performs undercoating, which can effectively implement anti-corrosion, dust-proof, rust-proof, etc. There are advantages.

Second, since the present invention performs pretreatment through water sandblasting, there is an advantage that a separate process such as oil removal is not required.

Third, the present invention has the advantage of minimizing environmental pollution such as fine dust when removing rust or foreign substances from the metal surface because the fine spray material is mixed with water and sprayed with air.

Fourth, the present invention has the advantage of preventing rust from occurring in the gap because the undercoating agent is injected into the gap between the main frame and the subframe from which paint is removed.

1 is a flowchart illustrating an undercoating method of a commercial vehicle according to a first embodiment of the present invention.
2 is a flowchart illustrating a pre-sanding process step according to the first embodiment of the present invention.
3 is an exemplary view of a commercial vehicle in which the loading device is separated.
4 is an exemplary view of a commercial vehicle equipped with a loading device.
5 is an exemplary view of a commercial vehicle equipped with a dump truck loading device.
6 is a schematic configuration diagram of water sandblasting according to the first embodiment of the present invention.
7 is an enlarged view showing the high-pressure discharge port of FIG.
8 is a schematic configuration diagram of a water sandblasting according to a second embodiment of the present invention.
9 is a schematic configuration diagram of a water sandblasting according to a third embodiment of the present invention.
10 is a flowchart illustrating an undercoating method of a commercial vehicle according to a fourth embodiment of the present invention.
11 is a flowchart illustrating a pre-sanding process step according to a fifth embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

1 is a flowchart illustrating an undercoating method of a commercial vehicle according to a first embodiment of the present invention, FIG. 2 is a flowchart illustrating a sanding pre-processing step according to a first embodiment of the present invention, and FIG. 3 is loading It is an exemplary view of a commercial vehicle in which the apparatus is separated, FIG. 4 is an exemplary view of a commercial vehicle equipped with a loading device, and FIG. 5 is an exemplary view of a commercial vehicle equipped with a loading apparatus of a dump truck.

The undercoating method of a commercial vehicle according to the present invention may mean performing a series of operations to be described later on a structure including a main frame of a vehicle for soundproofing, waterproofing and corrosion prevention.

1, the undercoating method of a commercial vehicle according to the present embodiment includes a stocking step (S10), a loading device separation step (S20), a sanding pretreatment step (S30), an undercoating step (S40) and a post-treatment step ( S50).

3 to 6 , a typical commercial vehicle 1 includes a driving vehicle 2 including a driving wheel 3 for generating a driving force, and coupled to the driving vehicle 2 , the driving vehicle 2 ) is disposed at the rear, and includes a utility vehicle (5) on which the driven wheel (4) is disposed.

Commercial vehicles may include dump trucks of 2.5 tonnes or more carrying loads. Commercial vehicles may include construction machines. Commercial vehicles may include special vehicles such as fire trucks, snow plows, mixer trucks, and tank lorries.

The driving vehicle 2 has an engine disposed therein, and a driver can ride it. The utility vehicle 5 is a part assembled to the driving vehicle 2, and various components may be assembled depending on the purpose.

For example, in the case of a dump truck, a loading box is installed in the utility vehicle 5 . In the case of ready-mixed concrete, a mixer capable of mixing concrete is installed in the utility vehicle 5 . In the case of a crane, a plurality of booms 5 ′ that can extend the length of the utility vehicle 5 are installed.

The utility vehicle 5 includes a main frame assembly 6 coupled to the driving vehicle 2, a driven wheel 4 assembled under the main frame assembly 6 and rotating, and the main frame assembly ( a utility 7 assembled on top of 6), and a subframe 8 disposed between the utility 7 and the mainframe assembly 6 .

The main frame assembly 6 constitutes a skeleton of the utility vehicle 5 and supports the load of the utility vehicle 7 . The utility 7 is assembled on the upper side of the main frame assembly 6 .

The utility 7 may be the above-described loading box, mixer, boom 5', or the like.

The mainframe assembly 6 may include at least two mainframes 6' arranged to extend long in the front-rear direction, and horizontal frames 6" connecting the at least two mainframes 6'. have.

The subframe 8 is disposed on the upper side of the main frame 6', and is fastened to the main frame 6' through bolts 8a or the like. The loading box, mixer, boom 5', etc. are disposed on the upper side of the subframe 8, and the subframe 8 supports the loading box, mixer, and boom 5'.

A minute gap 9 may be disposed between the subframe 8 and the main frame 6 ′ in the vertical direction. Although the subframe 8 and the main frame 6' are fastened through bolts 8a, etc., a minute relative displacement may occur due to vibration during operation.

In addition, water or foreign substances may penetrate into the gap 9 , and water or foreign substances may penetrate deeper due to vibration generated during driving. The subframe 8 and the main frame 6' may be corroded by the water penetrating into the gap 9, which reduces the service life of the vehicle.

Corrosion generated in the gap (9) is difficult to remove unless the utility (7) is separated.

1 or 2, the wearing step (S10) is a pre-step of the sanding pre-processing step (S30), which will be described later, and is a step of wearing and fixing a commercial vehicle. Or, it is the operation of lifting and placing on the workbench.

The loading device separation step ( S20 ) is a step of separating the loading box, the mixer, the boom 5 ′, etc. disposed on the upper side of the subframe 8 .

When the loading box, mixer, boom 5', etc. are removed, the main frame 6' and the subframe 8 may be exposed.

The sanding pre-treatment step (S30) is a step of separating a portion not to be coated in the vehicle for the undercoating step (S40) or removing foreign substances on the portion to be coated.

The pre-sanding treatment step (S30) includes a step (S37) of removing paint or rust attached to the surfaces of the main frame 6' and the subframe 8.

Before the rust removal step (S37), it may further include a separation step of separating unnecessary coating parts.

The method may further include a covering step of covering parts that should not be coated after the rust removal step (S37). The part not to be coated may be a tire, a mud cover of a fender, a lower cover, or a heat sink.

In this embodiment, water sandblasting is used for the rust removal step (S37). Unlike this embodiment, dry sandblasting that does not use water may be used. However, when dry sandblasting is used, oil removal must be performed separately for the coated part.

In this embodiment, since water sandblasting is used, a separate oil removal may be omitted.

5 is a schematic configuration diagram of water sandblasting according to a first embodiment of the present invention, and FIG. 6 is an enlarged view showing the high-pressure discharge port of FIG.

5 or 6, the water sandblasting according to this embodiment includes an air compressor 10 for compressing air through an applied power source, a water pump 20 for compressing water through an applied power source, It is connected to the air compressor (10) to receive compressed air, and an air tank (30) for storing compressed air, is connected to the air tank (30) to selectively receive compressed air, and the water pump (20) A storage tank 50 in which the compressed water is selectively supplied in connection with the injection material is stored, the discharge hose 60 through which the injection material 40 discharged from the storage tank 50 is moved, and the discharge hose It is coupled to the stage of (60) and includes a nozzle (70) to which water, air, and a spray material are sprayed.

The air compressor 10 is a mechanical device that operates with an applied power and increases the pressure by compressing the gas.

The driving method of the air compressor is largely divided into a positive displacement type and a dynamic type.

A representative example of the displacement type compressor is a reciprocating piston type compressor, which is widely used to supply compressed air for factories. This compressor consists of a cycle that sucks in air, compresses it, and then discharges it according to the reciprocating motion of the piston in the cylinder and the opening and closing of the valve. This type is generally used when higher pressure than flow rate is required.

A dynamic compressor is a device that increases the pressure of a gas with momentum due to a large flow velocity obtained by rotating a rotational difference at a very high speed, and is often used when a large flow rate is required.

Since the structure and operating principle of the air compressor 10 are general techniques to those skilled in the art, detailed description thereof will be omitted.

The water pump 20 is a mechanical device that operates with an applied power and increases the pressure by compressing water. Since the structure and operating principle of the water pump 20 are general techniques to those skilled in the art, detailed description thereof will be omitted.

The air tank 30 may receive compressed air through the air compressor 10 and store the received compressed air.

The compressed air stored in the air tank 30 may be provided to the storage tank 50 . In addition, the compressed air stored in the air tank 30 may be provided to the discharge hose (60).

The water sandblast further includes a first connecting pipe 110 connecting the air tank 30 and the storage tank 50 . Compressed air may flow to the storage tank 50 through the first connection pipe 110 . The first connection pipe 110 is connected to the upper side of the storage tank 50 .

One end 111 of the first connection pipe 110 is connected to the air tank 30 , and the other end 112 is connected to the storage tank 50 . The other end 112 supplies compressed air to the inner upper side of the storage tank 50 . The compressed air supplied to the storage tank 50 may be provided on the upper portion of the injection material 40 and pressurize the injection material 40 .

The injection material 40 may be a glid glass sphere, silicon, sea sand, or the like. In this embodiment, sand is used as the spraying material 40 .

A check valve 113 may be further disposed on the first connection pipe 110 . The check valve 113 allows air to flow only in the direction from the air tank 30 to the storage tank 50 and blocks the air flow in the opposite direction.

A first valve 114 may be further disposed on the first connection pipe 110 . In this embodiment, the first valve 114 is an on-off valve is used. The first valve 114 may open and close the first connection pipe 110 by receiving an electrical signal.

The first valve 114 is preferably disposed between the first check valve 113 and the other end 112 . When classification is required, the check valve 113 may be referred to as a first check valve.

The water sandblast may further include a second connection pipe 120 connecting the water pump 20 and the storage tank 50 .

Water extruded through the second connection pipe 120 may flow to the storage tank 50 . The water pump 20 compresses water to a high pressure and discharges it at a high pressure.

The second connection pipe 120 is connected to the upper side of the storage tank (50).

One end 121 of the second connection pipe 120 is connected to the water pump 20 , and the other end 122 is connected to the storage tank 50 .

A high-pressure water pipe 150 connected to the other end 122 is disposed inside the storage tank 50 . The high-pressure water flows through the high-pressure water pipe 150 .

The high-pressure water pipe 150 includes a high-pressure inlet 151 connected to the other end 122 and a high-pressure outlet 152 disposed inside the lower side of the storage tag 50 .

The high-pressure discharge port 152 is positioned to be embedded in the injection material 40 .

A check valve 123 may be further disposed on the second connection pipe 120 . The check valve 123 allows water to flow only in the direction of the storage tank 50 from the water pump 20 and blocks the flow in the opposite direction.

A second valve 124 may be further disposed on the second connection pipe 120 . In this embodiment, the second valve 124 is an on-off valve. The second valve 124 may open and close the second connection pipe 120 by receiving an electrical signal.

The second valve 124 is preferably disposed between the second check valve 123 and the other end 122 . When classification is required, the check valve 123 may be referred to as a second check valve.

The water sandblast may further include a third connection pipe 130 connecting the storage tank 50 and the discharge hose 60 .

One end 131 of the third connection pipe 130 is connected to the storage tank 50 , and the other end 132 is connected to the discharge hose 60 .

A third valve 134 may be further disposed in the third connection pipe 130 . In this embodiment, the third valve 134 is an on-off valve. The third valve 134 may open and close the third connection pipe 130 by receiving an electrical signal.

The third connection pipe 130 is disposed in the vertical direction. The injection material 40 and water of the storage tank 50 may be moved in a mixed state through the third connection pipe 130 .

A state in which the injection material 40 and water are mixed is defined as a first injection state.

The injection material 40 and water may be moved to the discharge hose 60 . The injection material 40 may be in a state wetted with the water. The third connection pipe 130 is disposed in the direction of gravity so that the injection material 40 and water are easily moved.

When the third connection pipe 130 is disposed inclinedly or horizontally, the viscosity and friction of the spraying material 40 soaked in water may increase and clogging may occur, and the wet spraying material 40 may be removed. More pressure is required to move it.

The water sandblast may further include a fourth valve 64 disposed on the discharge hose 60 . In this embodiment, the fourth valve 64 is an on/off valve. The fourth valve 64 may open and close the discharge hose 60 by receiving an electrical signal.

The water sandblast may further include a fourth connection pipe 140 connecting the air tank 30 and the third connection pipe 130 .

* One end 141 of the fourth connection pipe 140 is connected to the air tank 30 , and the other end 142 is connected to the third connection pipe 130 .

A check valve 143 may be further disposed on the fourth connection pipe 140 . The check valve 143 allows air to flow only in the direction of the discharge hose 60 from the air tank 30 and blocks the air flow in the opposite direction.

The nozzle 70 is connected to the end of the discharge hose 60 . An operator may hold and move the nozzle 70 .

Switches 71, 72, 73, ( 74) is placed.

A switch controlling the first valve 114 is referred to as a first switch 71 , a switch controlling the second valve 124 is referred to as a second switch 72 , and the third valve 134 is referred to as a switch. The control switch is referred to as a third switch 73 , and the switch controlling the fourth valve 64 is referred to as a fourth switch 74 .

In this embodiment, the first valve 114, the second valve 124, the third valve 134, and the fourth valve 64 are connected through the respective switches 71, 72, 73, and 74. control

The first valve 114 may be opened and closed by manipulating the first switch 71 . The second valve 124 may be opened and closed by manipulating the second switch 72 . The third valve 134 may be opened and closed by manipulating the third switch 73 . The fourth valve 64 may be opened and closed by manipulating the fourth switch 74 .

Unlike this embodiment, a batch switch (not shown) capable of opening or closing each valve at once may be disposed.

Each of the switches 71 , 72 , 73 , 74 and the valves 114 , 124 , 134 , and 64 may be connected via a wired or wireless connection.

By disposing the switches 71 , 72 , 73 , and 74 on the nozzle 70 , the operator can operate the water sandblasting while holding the nozzle 70 and perform the operation.

This embodiment has the advantage that the water sandblasting can be operated by the operator alone by arranging the switches 71, 72, 73, and 74 on the nozzle 70.

The storage tank 50 has a storage space formed therein. The injection material 40 is stored in the lower side of the storage space. A division in which the injection material is located among the storage spaces is referred to as a first storage space 51 , and an empty space above the stored injection material 40 is referred to as a second storage space 52 .

The first storage space 51 may be changed according to the amount of the injection material. When the amount of the injection material is small, the volume of the first storage space 51 may be small and the volume of the second storage space 52 may be large in inverse proportion to it.

The second storage space 52 may be filled with air. A first connection pipe 110 may be connected to the second storage space 52 , and compressed air of the first connection pipe 110 may be filled.

The other end 112 of the first connection pipe 110 communicates with the second storage space 52 .

The other end 112 is preferably disposed at a position high enough so that the injection material 40 does not accumulate. The other end 112 of the first connector 110 is preferably disposed above the other end 122 of the second connector 120 .

The compressed air supplied through the first connection pipe 110 may form a high pressure in the second storage space 52 . The high pressure formed in the second storage space 52 presses the injection material 40 , and through this, the injection material 40 may flow to the third connection pipe 130 .

When a sufficient high pressure is not formed in the second storage space 52 , it is difficult to flow the wet sand downward. In the case of dry sand, the frictional force is low, but in the case of wet sand, it aggregates to form a very high viscosity and frictional force.

An inlet 54 may be formed on the upper side of the storage tank 50 , and a cover 55 for opening and closing the inlet 54 may be disposed. The cover 55 may be fastened to the storage tank 50 through a fastening member such as a bolt.

The cover 55 may seal the inlet 54 . As the cover 55 closes the inlet 54 , the pressure in the second storage space 52 can be more effectively formed. If the inlet 54 is not sealed, sufficient pressure cannot be formed in the second storage space 52 .

The high-pressure water pipe 150 includes a high-pressure inlet 151 connected to the second connection pipe 120 and a high-pressure discharge port 152 disposed above the third connection pipe 131 .

In this embodiment, the high-pressure inlet 151 is horizontally arranged, and the high-pressure discharge port 152 is arranged vertically.

The high-pressure water pipe 150 may further include a first high-pressure part 153 in which the high-pressure inlet 151 is formed, and a second high-pressure part 154 in which the high-pressure outlet 152 is formed.

The first high-pressure part 153 and the second high-pressure part 154 may have a pipe shape.

The second high-pressure part 154 is formed to extend in a vertical direction, and the high-pressure outlet 152 is disposed at a lower end thereof. The high pressure outlet 152 may be disposed to face downward in the vertical direction.

The high-pressure discharge port 152 may be disposed above the third connection pipe 130 . The high-pressure discharge port 152 is disposed above one end 131 of the third connection pipe 130 .

The high-pressure discharge port 152 and the one end 131 of the third connection pipe 130 are disposed to be vertically spaced apart, and the injection material 40 may be disposed between the high-pressure discharge port 152 and the one end 131 . have.

It is preferable that the high-pressure discharge port 152 faces the one end 131 . By directing the high-pressure discharge port 152 toward the one end 131, the amount of sand wetted with water can be minimized.

When a large amount of sand is wet by the water sprayed from the high-pressure discharge port 152 , the flow of sand may be limited.

In this embodiment, since the water discharged from the high-pressure discharge port 152 is discharged toward one end 131 of the third connection pipe 130 , wet sand can be quickly moved to the third connection pipe 130 . have.

The second high-pressure part 154 may be disposed at the center of the flat cross-section of the storage tank 50 . The storage tank 50 may be formed to be elongated in the vertical direction.

The storage tank 50 includes a lower tank 80 to which the third connection pipe 130 is connected, and an upper tank 90 coupled to the upper end of the lower tank 80 .

The upper tank 90 may have a hollow cylindrical shape. The second high-pressure part 154 may be disposed at the center of the flat cross-section of the upper tank 90 .

The lower tank 80 may have a hollow interior and a downwardly pointed shape. The lower end of the upper tank 90 may be coupled to the upper end 81 of the lower tank 80 .

The lower tank 80 may have a conical shape pointed downward.

The second high-pressure part 154 may be disposed at the center of the flat cross-section of the lower tank 80 .

The second high-pressure part 154 may be disposed over the inside of the upper tank 90 and the inside of the lower tank 80 . The high-pressure discharge port 152 is positioned between the upper end 81 and the lower end 82 of the lower tank 80 .

One end 131 of the third connection pipe 130 is coupled to the sharp lower end 82 of the lower tank 80 .

The lower tank 80 forms a guide wall 83 inclined with respect to the vertical direction. The inclination angle A of the guide wall 83 may be formed at 50 degrees to 80 degrees.

By forming the inclination angle A of the guide wall 83 steep, the stored sand can flow down by its own weight.

When the inclination angle (A) of the guide wall 83 is gently formed to be less than 45 degrees, when the sand is wet with water, it can be maintained in a state in which it cannot flow downward due to the viscosity and friction of the water.

In the present embodiment, by forming the guide wall 83 at a steep slope, it is possible to minimize the attachment of sand to the guide wall 83 .

In addition, the height of the lower tank 80 may be at least 1 meter or more. Specifically, the height difference between the upper end 81 and the lower end 82 of the lower tank 80 may be 1 meter or more.

By forming the height of the lower tank 80 to be 1 meter or more, the sand can be moved toward the third connection pipe 130 by using the load of the sand stored therein.

Referring to FIG. 6 , a plurality of high-pressure outlets 152 may be disposed in the second high-pressure part 154 . The high-pressure outlet 152 includes a first high-pressure outlet 152a disposed below the second high-pressure part 154 and a second high-pressure outlet 152b disposed on a side surface of the second high-pressure part 154 . .

The first high-pressure outlet 152a is disposed on the lower side of the second high-pressure part 154 , is disposed toward the lower end 82 of the lower tank 80 , and a plurality of first high-pressure outlets 152a may be disposed.

The second high-pressure outlet 152b may be disposed on a side surface of the second high-pressure part 154 and may be disposed to face the guide wall 83 .

A plurality of the second high-pressure outlets 152b may be disposed along the outer peripheral surface of the second high-pressure part 154 .

Looking at the operation process of the water sandblast according to this embodiment as follows.

First, an operator operates the air compressor 10 and the water pump 20, and the compressed air generated by the air compressor 10 is stored in the air tank 30, and the Water is supplied to the second connection pipe 120 .

The compressed air of the air tank 30 is supplied to the first connection pipe 110 and the third connection pipe 130 .

* When the operator operates the first switch 71 to open the first valve 114, the compressed air is supplied to the second storage space 52 of the storage tank 50, and the second storage A high pressure is formed in the space 52 , and the high pressure of the second storage space 52 presses the injection material 40 stored in the storage tank 50 downward.

When the operator operates the second switch 72 to open the second valve 124 , the water in the second connection pipe 120 flows into the high-pressure water pipe 150 , and the high-pressure discharge port 152 . ) is discharged from

When the third valve 134 is opened by the operator operating the third switch 73 , the injection material 40 together with the water discharged from the high-pressure discharge port 152 flows through the third connection pipe 130 . It may flow through the discharge hose 60 side.

* In addition, when the fourth valve 64 is opened by the operator operating the fourth switch 74 , the wet spraying material 40 may flow to the nozzle 70 through the discharge hose 60 . .

Water, air, and a spray material sprayed from the nozzle 70 are defined as a water sand.

At this time, when the fourth valve 64 is opened, high-pressure compressed air is provided to the discharge hose 60 through the fourth connection pipe 140 and pressurizes the flowing wet injection material 40 . It can flow through the discharge hose (70).

The wet spraying material 40 sprayed through the nozzle 70 can remove rust, paint, and the like adhering to the surfaces of the main frame 6 ′ and the subframe 8 .

Referring back to FIG. 2 , the sanding pretreatment step 30 according to the present embodiment includes steps S31 and S32 in which the air compressor 10 and the water pump 30 are operated (on), and after the step S31 After the steps S33, S34, S35, and S36 of opening the valves 114, 124, 134, and 64, and the steps S33 to S36, the water sand sprayed from the nozzle 70 After the rust removal step (S37) of spraying the surface of the main frame (6') and the subframe 8 (S37), and after the rust removal step (S37), the valves 114, 124, 134, and 64 are removed. It includes a closing step (S133) (S134) (S135) (S136) and a drying step (S38) performed after the steps S133 to S136.

A step (S31) of applying power to the air compressor (10) and operating it through an operator's operation and a step (S32) of applying power to the water pump (20) and operating it may be performed.

A tissue signal is input to the switches 71, 72, 73, and 74 through the operator's operation, and the first valve 114, the second valve 124, the third valve 134 and the fourth Each of the valves 64 can be opened.

The first valve 114 , the second valve 124 , the third valve 134 , and the fourth valve 64 may be opened in any order. In addition, opening and closing of the first valve 114 , the second valve 124 , the third valve 134 , and the fourth valve 64 may be performed automatically.

When the first valve 114 , the second valve 124 , the third valve 134 , and the fourth valve 64 are all opened, the water sand may be sprayed through the nozzle 70 .

The operator may adjust the injection position by adjusting the direction of the nozzle 70 . The nozzle 70 may be held by a worker or may be mounted on a structure.

The water sand sprayed from the nozzle 70 is sprayed on the object to be processed (the main frame 6' and the subframe 8), and the foreign substances on the surface of the main frame 6' and the subframe 8 are removed. can The foreign material may be painted or melted.

The surface of the main frame 6 ′ and the subframe 8 may be surface treated through the water sand.

In this embodiment, the paint of the main frame 6' and the subframe 8 may be in a factory state. Since a separate undercoating is not performed on the mainframe 6 ′ and the subframe 8 at the time of leaving the vehicle, the undercoating may be performed after the paint of the outgoing vehicle is peeled off through the water sand.

Steps S133 to S136 are performed after the rust removal step (S37). Steps S133 to S136 are steps of closing the valves 114 , 124 , 134 and 64 .

Steps S133 to S136 may be implemented through manipulation of the switches 71 , 72 , 73 , and 74 .

The drying step (S38) may be performed after the steps S133 to S136.

In the drying step (S38), the utility 7 including the main frame 6' and the subframe 8 is dried. The drying step (S38) includes natural drying.

Sandblasting may be used to shorten the drying step (S38) time.

The first valve 114 , the second valve 124 , and the third valve 134 except for the fourth valve 64 are closed through the operation of the switches 71 , 72 , 73 and 74 .

That is, only the fourth valve 64 may be opened by receiving the manipulation signal of the fourth switch 74 in steps S133 to S136 .

When the first valves 114, 124, and 134 are closed and only the fourth valve 64 is opened, the compressed air of the air tank 30 is transferred to the fourth connection pipe 140, the discharge hose ( 60) through the nozzle 70 may be supplied.

Compressed air is discharged from the nozzle 70 to remove the moisture in the gap 9 or to evaporate it quickly.

The undercoating step (S40) is performed after the pre-sanding step (S30).

In the undercoating step ( S40 ), an undercoating agent is sprayed on the utility 7 including the main frame 6 ′ and the subframe 8 . The undercoating agent may be an oil-based undercoating agent or an aqueous undercoating agent.

In particular, the undercoating agent is sprayed on the mainframe 6' and the subframe 8, and the undercoating agent is allowed to permeate into the gap 9 between the mainframe 6' and the subframe 8. The undercoating agent may penetrate into the gap 9 from which the rust or paint has been removed through capillary action.

Since the undercoating agent closes the gap 9 , it is possible to block the penetration of moisture into the gap 9 .

The post-processing step (S50) includes removing a cover such as a tire, a fender mud cover, a lower cover, or a heat sink performed in the sanding pre-processing step. The post-processing step (S50) may include returning the loading device such as the loading box, the mixer, and the boom 5' to the original position.

7 is a schematic configuration diagram of a water sandblasting according to a second embodiment of the present invention.

Referring to FIG. 7 , the water sandblasting according to the present embodiment is different from the first embodiment in the coupling structure of the fourth connector.

Specifically, the fourth connection pipe 1140 according to this embodiment provides the compressed air to the discharge hose 60 is the same, but one end 1411 of the fourth connection pipe 1140 is connected to the first connection pipe ( 110), and the other end 1142 is connected to the connecting hose 60.

As in the first embodiment, one end 111 of the first connection pipe 110 is connected to the air tank 30 , and the other end 112 is connected to the storage tank 50 .

So, some of the compressed air flowing through one end 111 of the first connection pipe 110 may flow toward the first check valve 113 , and the rest may flow toward the fourth connection pipe 1140 . .

Hereinafter, since the rest of the configuration is the same as that of the first embodiment, a detailed description thereof will be omitted.

8 is a schematic configuration diagram of a water sandblasting according to a third embodiment of the present invention.

Referring to FIG. 8 , the water sandblasting according to the present embodiment is different from the first embodiment in the structure of the high-pressure water pipe.

The high-pressure water pipe 1500 according to this embodiment includes a first high-pressure part 1510 in which the high-pressure inlet 151 is formed, a second high-pressure part 1520 in which the high-pressure outlet 152 is formed, and the first high-pressure part ( 1510 ) and a third high-pressure part 1530 connecting the second high-pressure part 1520 .

The first high-pressure part 1510 , the second high-pressure part 1520 , and the third high-pressure part 1530 may have a pipe shape.

The first high-pressure part 1510 is connected to the second connection pipe 120 , the second high-pressure part 1520 is connected to the first high-pressure part 1510 , and the third high-pressure part 1530 is connected to the second It is connected to the high-pressure part 1520 .

The first high-pressure unit 1510 may be disposed in a horizontal direction.

The second high-pressure part 1520 is formed to extend long in the vertical direction.

The third high-pressure part 1530 is inclined, and the high-pressure discharge port 152 is disposed at the lower end.

The second high-pressure part 1520 may be disposed parallel to the sidewall of the upper tank 90 . The third high-pressure part 1530 may be disposed parallel to the guide wall 83 of the lower tank 80 .

An upper bracket 1540 for fixing the second high-pressure part 1520 to the upper tank 90 may be further disposed. A lower bracket 1550 for fixing the third high-pressure unit 1530 to the lower tank 80 may be further disposed.

When high-pressure water is discharged to the high-pressure discharge port 152 , the water may flow along the inner surface of the nearby guide wall 83 , and may be moved together with the flowing water as a fine injection material.

In the water sandblasting according to this embodiment, since the high-pressure discharge port 152 of the third high-pressure part 1530 is disposed close to the guide wall 83, the injection material in close contact with the inside of the guide wall 83 is applied to the lower tank. It can be easily moved to the lower end 82 side of the 80 .

Hereinafter, since the rest of the configuration is the same as that of the first embodiment, a detailed description thereof will be omitted.

10 is a flowchart illustrating an undercoating method of a commercial vehicle according to a fourth embodiment of the present invention.

The undercoating method of a commercial vehicle according to this embodiment is optimized for a dump truck. In the case of a dump truck, since the front of the loading box can be lifted, there is no need to separate the loading box.

The dump truck is equipped with a hydraulic system including a hoist cylinder capable of lifting the load box.

So, the undercoating method of the commercial vehicle according to this embodiment includes the step (S25) of lifting the loading box using the hydraulic device of the dump truck after the stocking step (S10) instead of the step S20.

Hereinafter, since the rest of the configuration is the same as that of the first embodiment, a detailed description thereof will be omitted.

11 is a flowchart illustrating a pre-sanding process step according to a fifth embodiment of the present invention.

Unlike the first embodiment, the commercial vehicle undercoating method according to the present embodiment may pre-treat the commercial vehicle through dry sand instead of water sand.

When spraying the dry spray material, the second valve 124 is maintained in a closed state in step S34.

When the first valve 114 , the third valve 134 , and the fourth valve 64 are opened, the spray material in the dried state may be sprayed.

Depending on the state of the commercial vehicle, there are cases in which water must not be sprayed, and this embodiment can respond to this.

Before the start of steps S31 and S32, it may be determined in which flowchart of the first embodiment or the fifth embodiment to perform the preprocessing.

A button capable of providing water sand and a button capable of providing dry sand to the nozzle 70 may be included. When an operating force is input to the water sand button, the first valve 114 , the second valve 124 , the third valve 134 , and the fourth valve 64 may all be opened.

When an operating force is input to the dry sand button, the first valve 114 and the third valve among the first valve 114 , the second valve 124 , the third valve 134 , and the fourth valve 64 . Only 134 and the fourth valve 64 are opened, and the second valve 124 remains closed.

Hereinafter, since the rest of the configuration is the same as that of the first embodiment, a detailed description thereof will be omitted.

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims described below rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. should be interpreted

10: air compressor 20: water pump
30: air tank 40: spray material
50: storage tank 60: discharge hose
70: nozzle 80: lower tank
90: upper tank 110: first connection pipe
120: second connector 130: third connector
140: fourth connection pipe 150: high pressure water pipe

Claims (1)

warehousing step (S10) in which construction equipment is stocked;
a loading device separation step of separating the utility from the construction machine (S20);
A sanding pre-processing step (S30) of removing at least one of paint or rust from the utility-separated construction machine;
Including; an undercoating step (S40) of applying an undercoating agent to the surface from which the paint or rust has been removed;
The sanding pre-processing step (S30),
The air compressor 10 and the water pump 20 are operated (on) step (S31) (S32);
after the step S31, opening the first to fourth valves (S33) (S34) (S35) (S36);
a rust removal step (S37) of spraying the water sand sprayed from the nozzle (70) on the surfaces of the main frame (6') and the subframe (8) of the construction machine after the steps S33 to S36;
closing the first to fourth valves after the rust removing step (S37) (S133) (S134) (S135) (S136);
Including; the drying step (S38) carried out after the S133 to S136;
After the steps S33 to S36, the high-pressure water discharged from the high-pressure discharge port 152 is discharged toward the lower end 82 of the lower tank 80,
The water sand discharged from the lower tank 80 passes through the third valve 134 and the fourth valve 64 and flows to the nozzle 70,
Controlling the opening and closing of the first to fourth valves through a switch disposed on the nozzle,
Further comprising a water sandblast for the sanding pretreatment step (S30),
The water sandblast,
Air compressor 10 for compressing air through the applied power;
Water pump 20 for compressing water through the applied power;
an air tank 30 connected to the air compressor 10 to receive compressed air and to store the compressed air;
a storage tank 50 that is connected to the air tank 30 to selectively receive compressed air, is connected to the water pump 20 to selectively receive compressed water, and stores the injection material;
a discharge hose 60 through which the injection material 40 discharged from the storage tank 50 is moved;
a nozzle 70 coupled to the discharge hose 60 to which water, air, and a spray material are sprayed;
a high-pressure water pipe 150 disposed inside the storage tank 50 and receiving water from the water pump;
a first connection pipe 110 for connecting the air tank 30 and the storage tank 50;
a second connection pipe 120 connecting the water pump 20 and the storage tank 50;
a third connection pipe 130 for connecting the storage tank 50 and the discharge hose 60; and
A fourth connection pipe 140 connecting the air tank 30 and the third connection pipe 130; includes;
a first valve disposed on the first connection pipe and opening and closing the first connection pipe;
a second valve disposed on the second connection pipe and configured to open and close the second connection pipe;
a third valve disposed on the third connection pipe and configured to open and close the third connection pipe;
and a fourth valve disposed on the discharge hose and opening and closing the discharge hose;
The storage tank 50,
a lower tank 80 connected to the discharge hose; An upper tank (90) coupled to the upper end of the lower tank (80), connected to the air tank to receive compressed air, and connected to the water pump to receive water;
The third connection pipe 130 is connected to the lower end 82 of the lower tank 80,
The high-pressure water pipe 150,
a high-pressure inlet 151 connected to the second connection pipe 120;
a first high-pressure part 153 connected to the high-pressure inlet 151;
a second high-pressure part 154 connected to the first high-pressure part 153 and having a high-pressure discharge port 152 on the lower side thereof;
The high-pressure discharge port 152 is disposed between the upper end 81 and the lower end 82 of the lower tank 80,
The second high-pressure part 154 extends long in the vertical direction, and the high-pressure outlet 152 is disposed to be embedded in the spraying material,
The high-pressure water sprayed from the high-pressure discharge port 152 is discharged toward the lower end 82 of the lower tank 80,
The water sand generated in the lower tank 80 is discharged through the third connection pipe 130,
The undercoating method of construction machinery, characterized in that it further comprises a separation step of separating parts not to be coated before the rust removal step (S37) and a covering step of covering the parts that should not be coated after the rust removal step (S37).

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