RU214472U1 - ABRASIVE SUPPLY UNIT FOR ABRASIVE BLASTING MACHINE - Google Patents

Abstract

The utility model relates to abrasive blasting equipment. An abrasive-air mixture supply unit for an abrasive blasting machine, containing a housing (1), a jet (2) and a plug (6). In this case, the body consists of cross-shaped tubular first, second, third and fourth parts having through channels communicating with each other in the area of the cross. The channels of the said first and second tubular parts of the body (1) and the channels of the mentioned third and fourth tubular parts of the body (1) are located coaxially. The jet (2) is installed in the mentioned first part of the housing (1) and has a channel for loose abrasive with inlet and outlet holes. The plug (6) closes the gap of the said second part of the body (1). In this case, the outlet of the jet channel (2) is located below the axis of the mentioned channel of the third and fourth parts of the body (1). Provides automatic shutdown of the abrasive supply after the compressed air supply is interrupted without the use of manually activated taps, solenoid valves and similar devices. 12 w.p. f-ly, 1 ill.

Description

Field of technology to which the utility model belongs

The utility model relates to abrasive blasting equipment.

State of the art

Traditional abrasive feed units work as follows:

sand enters from the tank through the channel;

a crane is installed at the end of the channel, designed to stop or resume the supply of sand;

perpendicular (or at some angle) to the flow of abrasive (for example, sand) compressed gas (for example, air) is supplied;

gas captures abrasive particles, thereby forming an abrasive-gas mixture.

Such units work stably only as long as the blast gun is open. Immediately after the mixture supply stops, the following happens: due to the lack of a constant gas flow, the abrasive continues to flow into the supply unit by inertia and fills it entirely, blocking the gap for the passage of gas. After the re-supply of compressed gas, the abrasive accumulated in the assembly is additionally compacted and forms a plug, which either completely blocks the flow of the abrasive-gas mixture, or increases the hydraulic resistance so much that predominantly gas without abrasive or predominantly abrasive with low kinetic energy comes out of the gun.

This problem could be solved by quickly stopping the supply of abrasive to the mixing unit immediately after closing the gun. However, this is difficult to implement in traditional units, since the gun is operated at a distance of at least 1 meter from the valve that shuts off the sand supply (the valve is located between the abrasive tank and the mixing unit, which is attached to the bottom of the abrasive tank to ensure abrasive flow "by gravity"). It is also possible to shut off the abrasive and gas supply when the gun is closed using quick-acting solenoid valves that actuate when the gun is closed. However, this complicates the design and, in addition to using the valves themselves, requires the use of an automation and control unit.

Thus, existing solutions are either inconvenient to use or have a complex design.

Utility Model Disclosure

The task of the assembly is to ensure the stable operation of the abrasive blasting (in particular, sandblasting) apparatus, ease of use, easy cleaning of the jet (sand supply channel).

By "stable operation" of the abrasive blasting machine is meant the uniform output of the abrasive-air mixture from the gun of the abrasive blasting machine, including after the resumption of work after a downtime.

By "convenient operation" is meant that the operator does not need to operate the sand supply crane due to the fact that it is absent in the proposed design of the supply unit. That is, the operator does not need to open or close the valve to stop or resume the supply of abrasive.

The technical result of the utility model is that the unit provides automatic shutoff of the abrasive supply after the supply of compressed air is stopped (for example, when the gun is closed) without the use of manually activated taps, solenoid valves and similar devices.

The above problem is solved due to the fact that the proposed abrasive-air mixture supply unit for the abrasive blasting apparatus contains:

body (1), consisting of cross-shaped tubular parts: the first, second, third and fourth, having through channels communicating with each other in the zone of the cross, while the channels of the mentioned first and second tubular parts of the body (1) and the channels of the mentioned third and the fourth tubular parts of the body (1) are located coaxially,

a jet (2) installed in the said first part of the body (1), having a channel for loose abrasive with inlet and outlet holes,

a plug (6) covering the lumen of said second part of the housing (1),

the said outlet of the jet channel (2) is located below the axis of the mentioned channel of the third and fourth parts of the body (1).

As noted above, in traditional mixing units, stability was ensured through technical compromises: either at the expense of ease of use (when the abrasive supply must be turned off manually using a valve located at a distance from the gun), or at the expense of simplicity of design (when the abrasive supply is blocked automatically by solenoid valves). The node described above is free from this shortcoming.

In the following, the aforementioned node, described in general categories, is explained by the example of some particularly preferred embodiments that provide additional advantages.

Any suitable loose abrasive can be used as an abrasive, such as quartz sand, copper slag, nickel slag, plastic abrasives, glass shot, garnet (garnet sand), corundum (aluminum oxide), cast iron shot, steel shot, or a mixture thereof. Preferably, when the abrasive has a uniform particle size distribution, it is especially preferred when the abrasive is a narrow fraction of particles of a given size.

Compressed air can be used as carrier gas. Air is supplied to the assembly under excess pressure.

As will be clear to a person skilled in the art, the lower the outlet of the jet channel, the less likely the formation of an abrasive plug that can completely block the channel clearance in the third part of the housing (1), through which the compressed air is supplied, or the channel clearance in the fourth part of the body (1), through which the abrasive-air mixture is discharged, or the lumen of the cavity of the cross, in which the abrasive and air are mixed. If the outlet of the jet channel were located in the upper part of the cavity of the cross, in this case, after stopping the supply of compressed air, the abrasive could fill the cavity of the cross, completely blocking its lumen. That is why, according to the utility model, the outlet is placed closer to the lower part of the cavity of the cross, preferably below the axis of the channels in the third and fourth parts of the body. In this case, the abrasive fills the cavity of the cross only to the level of the hole or slightly higher (taking into account that the abrasive is supplied from a vessel under excess pressure), leaving a free gap that provides air movement at a speed higher than the abrasive particle entrainment velocity.

In the extreme case, the orifice of the jet channel (2) can be located below the level of the intersection of the channel in the second part of the body (1) with the cavity of the cross. In this case, the abrasive mound practically does not block the channels or the cavity of the cross after the compressed air flow stops.

In the simplest form of execution of the above-described assembly from the point of view of design, the above-mentioned outlet of the jet channel (2) is located on the axis of the mentioned channel of the first and second parts of the body (1).

The inlet and outlet of the abrasive are selected to provide an optimal abrasive-air mixture. The length of the aforementioned jet is selected so that an abrasive plug does not form in the above assembly.

In one of the preferred embodiments of the assembly described above, the width of the said jet (2) is at least two times less than the width of the said channel of the third and fourth body parts (1) at the level of this hole.

In another preferred embodiment of the above-described assembly, the aforementioned channel of the third and fourth parts of the body (1) in the input zone of the jet (2) is made expanded.

In one of the preferred forms of execution of the above-described assembly, the clearance area of the aforementioned channel of the third and fourth parts of the body (1) between the walls of the channel and the abrasive embankment in equilibrium is less than 2/3 of the cross-sectional area of the channel of the third and fourth parts of the body (1).

In one of the preferred embodiments of the assembly described above, the channels of the aforementioned first and second body parts (1) are arranged coaxially on the vertical axis.

In another preferred embodiment of the assembly described above, the channels of the aforementioned third and fourth parts of the body (1) are arranged coaxially on the horizontal axis. In this case, the least hydraulic resistance is provided during the movement of the carrier gas and the abrasive-air mixture.

In one of the preferred embodiments of the above-described assembly, the aforementioned third body part (1) is provided with means for connecting to a hose for supplying an abrasive-air mixture, preferably selected from the group consisting of a flange or a thread.

In another preferred embodiment of the assembly described above, said fourth body part (1) is provided with means for connecting to a compressed air hose, preferably selected from the group consisting of a flange or a thread.

In another preferred embodiment of the above-described assembly, the aforementioned plug (6) of the second body part is connected to it by means of a quick-detachable connection selected from the group consisting of a threaded connection, a flange connection and a bayonet connection.

Thanks to the plug (6), in case of clogging of the sand supply channel (jet), the operator does not need to stop the process and disassemble the unit, it is enough to unscrew the plug (6), clean the channel with a metal rod and screw it back. In traditional designs, this operation requires complete disassembly of the supply and mixing of sand with air.

In another preferred embodiment of the assembly described above, the aforementioned first housing part is threaded for connection to the abrasive container via a nipple (7).

It must be understood that in this text the node is characterized only by such features that are sufficient to solve the problem, implement the purpose and achieve the selected technical result; a special mention of all, without exception, the signs and utilitarian characteristics of what kind of lamp? not required if specialists should know that products of the same kind have such features and utility characteristics and without them the main purpose is not realized; Moreover, it is not required to limit the generalized features to any specific options, if they should be known to specialists and (or) can be selected according to known rules.

The design and use of the device is clearly illustrated by figure 1 on the example of one of the private forms of execution.

Brief description of the drawings

In FIG. 1 shows the assembly diagram of the abrasive-air mixture supply unit according to the utility model.

Positions 1-7 indicate the following elements:

1 - body

2 - jet,

3 - hose for compressed air,

4 - quick fitting,

5 - fitting,

6 - plug,

7 - nipple.

Implementation of the utility model

As shown in FIG. 1, the abrasive-air mixture supply unit for the abrasive blasting apparatus, contains:

body (1), consisting of cross-shaped tubular parts: the first, second, third and fourth, having through channels communicating with each other in the zone of the cross, while the channels of the mentioned first and second tubular parts of the body (1) and the channels of the mentioned third and the fourth tubular parts of the body (1) are located coaxially,

a jet (2) installed in the said first part of the body (1), having a channel for loose abrasive with inlet and outlet holes,

a plug (6) covering the lumen of said second part of the housing (1),

the said outlet of the jet channel (2) is located below the axis of the mentioned channel of the third and fourth parts of the body (1).

Channels of the above-mentioned first and second parts of the body (1) are located coaxially on the vertical axis.

The channels of the aforementioned third and fourth parts of the body (1) are coaxially located on the horizontal axis.

The third part of the body (1) is equipped with a thread for connection with a fitting (5) for connecting the abrasive-air mixture supply hose.

The fourth part of the housing (1) is threaded for a quick-release fitting for the compressed air supply hose.

The second part of the body (1) is provided with a thread on which a plug (6) is installed.

The first part of the body (1) is threaded for connection to the abrasive container by means of a nipple (7).

The abrasive supply unit is assembled as follows: in the unit body (1) they are alternately screwed through the threaded seals, the fitting (5), the quick-release fitting 1/2 (4), the plug (6).

Nipple 1/2 (7) is screwed into the container of the abrasive blasting machine. Next, a jet (2) is installed in it, after which the body of the assembly (1) and the nipple (7) are connected to each other through a threaded connection. Then connect the hose for supplying compressed air (3) to the quick release (4), and connect the hose for supplying the abrasive-air mixture to the fitting (5). After that, the abrasive is poured into the tank.

When the carrier gas flow is applied, the abrasive is picked up last, forming an abrasive-air mixture, which enters the blast gun through a hose connected to the fitting (5). When the gun is closed and there is no constant flow of compressed air in the assembly, the abrasive fills the channel in the second part of the body (1), without rising above the level of the jet outlet (2). Thus, in the cavity of the cross there is always a gap for the passage of air, and after the resumption of the opening of the gun, and the formation of an air flow, the abrasive supply channel opens and the supply resumes.

Thanks to this design, there is no need to use a tap to open and close the abrasive supply channel.

Thus, the abrasive supply unit has a simple design, in which there is no abrasive supply valve from the abrasive container and a solenoid valve. However, the design of the proposed unit provides automatic shutoff of the abrasive flow after the compressed air supply is stopped. In addition, easy and quick access to jet cleaning is provided - to do this, just unscrew / otherwise remove the plug (6), or unscrew / otherwise separate the abrasive supply unit from the abrasive container and remove the jet from the first part of the body (1).

Claims (13)

1. An abrasive-air mixture supply unit for an abrasive blasting apparatus, containing a body (1) consisting of cross-shaped tubular parts: the first, second, third and fourth, having through channels communicating with each other in the area of the cross, while the channels of the mentioned first and of the second tubular part of the body (1) and the channels of the mentioned third and fourth tubular parts of the body (1) are located coaxially, the jet (2) installed in the said first part of the body (1), having a channel for loose abrasive with inlet and outlet holes, a plug ( 6) covering the lumen of said second part of the body (1), said outlet of the jet channel (2) is located below the axis of said channel of the third and fourth parts of the body (1). 2. The assembly according to claim 1, in which the aforementioned outlet of the jet channel (2) is located below the level of the intersection of the channel in the second part of the body (1) with the cavity of the cross. 3. The assembly according to claim 1, in which the aforementioned outlet of the jet channel (2) is located on the axis of the said channel of the first and second parts of the body (1). 4. The unit according to claim 1, in which the aforementioned jet (2) is configured to control the level of the location of the outlet of its channel. 5. The node according to claim 1, in which the width of the aforementioned jet (2) is at least two times less than the width of the aforementioned channel of the third and fourth parts of the body (1) at the level of this hole. 6. The unit according to claim 1, in which the aforementioned channel of the third and fourth parts of the body (1) in the input zone of the jet (2) is made expanded. 7. The assembly according to claim 1, in which the clearance area of the aforementioned channel of the third and fourth parts of the body (1) between the walls of the channel and the embankment of abrasive in equilibrium is less than 2/3 of the cross-sectional area of the channel of the third and fourth parts of the body (1). 8. The node according to claim 1, in which the channels of the aforementioned first and second parts of the body (1) are located coaxially on the vertical axis. 9. The node according to claim 1, in which the channels of the aforementioned third and fourth parts of the body (1) are located coaxially on the horizontal axis. 10. The unit according to claim 1, in which the third part of the body (1) is configured to be connected to the hose for supplying the abrasive-air mixture, preferably by means of a flange or thread. 11. Assembly according to claim 1, in which the fourth part of the housing (1) is configured to be connected to a compressed air hose, preferably by means of a flange or thread. 12. The assembly according to claim 1, in which the aforementioned plug (6) of the second body part is connected to it by means of a quick-detachable connection selected from the group including a threaded connection, a flange connection and a bayonet connection. 13. Assembly according to claim 1, in which the first part of the body (1) is threaded for connection to the abrasive container by means of a nipple (7).

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