Blast machining device

Abstract

To provide a blast machining device capable of reducing cost without deteriorating a work environment.SOLUTION: Compressed air is blown from compressed air blowing means 6 to generate negative pressure in a distribution pipe 21. A polishing material stored in a space of an envelope of mixing means and fed from a polishing material tank 4 is sucked through a through-hole of the distribution pipe 21 into the distribution pipe 21. The polishing material and the compressed air are mixed in the distribution pipe 21 to be fed to an injection nozzle 5. In a work chamber 3, the polishing material and the compressed air are injected to a workpiece to polish the surface of the workpiece, and a design such as prescribed characters or drawing patterns is formed in the surface of the workpiece with blast machining. In this case, the compressed air is not discharged outside from the work chamber 3 or the polishing material tank 4.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a blasting device that blasts the surface of a workpiece by injecting an abrasive together with compressed air from an injection nozzle inside a housing-shaped work chamber. [Background technology]

[0002] Conventionally, there is an apparatus for blasting the surface of a workpiece such as a glass product or a metal product, for example, as described in Patent Document 1. This apparatus sprays an abrasive together with compressed air from a spray nozzle introduced into the main body onto the workpiece placed on a table inside a housing-like main body, thereby polishing and blasting the surface of the workpiece.

[0003] At this time, the abrasive is supplied from a storage section at the top of the main body to the injection nozzle, where it is mixed with compressed air and injected. After being injected from the injection nozzle onto the workpiece, the compressed air and abrasive fall through numerous through holes formed in the table and are collected in a collection section at the bottom of the main body. A certain amount of accumulated abrasive is collected by opening the lid on the bottom of the collection section, while the compressed air is returned to the storage section at the top of the main body via a return pipe connected to the side of the collection section and exhausted to the outside through a filter installed in the main body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-223165 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional device, the injected compressed air is exhausted to the outside of the main body, which results in a large loss and requires a compressor with a large output for compressing the air, which is costly.

[0006] In addition, since the compressed air is exhausted to the outside of the main body, there is a risk that the exhaust may cause a deterioration of the working environment.

[0007] Furthermore, since the dust generated when the workpiece surface is polished falls into the recovery section at the bottom of the main body along with the abrasive, the abrasive accumulated in the recovery section cannot be reused and new abrasive needs to be prepared, resulting in increased costs. There is a need to reduce costs by simply circulating the abrasive accumulated in the recovery section.

[0008] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a blast processing device that does not deteriorate the working environment and can reduce costs. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the blast processing device according to the present invention is a blast processing device which blasts the surface of a workpiece by injecting an abrasive together with compressed air from a spray nozzle in a housing-shaped work chamber, the blast processing device comprising: compressed air supply means for supplying compressed air into the work chamber and to the spray nozzle; an insertion port opened in the work chamber to enable an operator to insert his / her arm into the work chamber to hold the workpiece and the spray nozzle; collection means connected to the work chamber and for collecting dust blown away by compressed air from the compressed air supply means from a mixture of the abrasive sprayed from the spray nozzle onto the surface of the workpiece in the work chamber and dust generated when the surface of the workpiece is polished by spraying the abrasive; an abrasive tank connected to a lower part of the work chamber and for storing the abrasive which falls after being sprayed from the spray nozzle onto the workpiece; and mixing means, which is provided midway through a compressed air circulation pipe from the compressed air supply means to the injection nozzle, for supplying the abrasive contained in the abrasive tank into the circulation pipe and mixing it therewith, wherein the mixing means has an envelope arranged to enclose a part of the circulation pipe and having a space between its inner surface and the outer surface of the circulation pipe, into which the abrasive in the abrasive tank drops and accumulates via a communication part with the abrasive tank, and a through hole provided inside the envelope to communicate between the inside of the circulation pipe and the space inside the envelope, and the abrasive accumulated in the space of the envelope is sucked into the circulation pipe through the through hole by negative pressure generated in the circulation pipe by the supply of compressed air from the compressed air supply means, and the abrasive and compressed air are supplied to the injection nozzle in a mixed state.

[0010] According to this configuration, negative pressure is generated in the flow pipe by the supply of compressed air from the compressed air supply means, and the abrasive from the abrasive tank that has accumulated in the space of the housing of the mixing means is sucked into the flow pipe through the through hole in the flow pipe, and the abrasive and compressed air are mixed in the flow pipe and supplied to the injection nozzle and injected onto the workpiece, polishing the surface of the workpiece, and blasting processing such as engraving a predetermined design such as letters or patterns on the surface of the workpiece and removing unwanted adhesions is performed.

[0011] At this time, the dust generated from the workpiece by blasting is generally finer and lighter than the abrasive, so only the dust is blown away by the compressed air and collected by a collection means by suction, etc., while the abrasive, after the dust from the workpiece has been removed, is stored in an abrasive tank, mixed with compressed air by a mixing means, and sprayed from the spray nozzle onto the workpiece, following a circulation path.

[0012] Therefore, the compressed air is not discharged outside the work room or the abrasive tank, and it is possible to prevent the deterioration of the work environment due to dust. In addition, the compressor for the compressed air supply means can be a small output compressor instead of the conventional large output compressor, and since the abrasive is circulated, there is no need to prepare a new abrasive for blasting as in the conventional method, which can reduce costs.

[0013] In addition, the through hole of the mixing means is formed by a bolt that is detachably screwed into the flow pipe, and a plurality of types of bolts having through holes of different diameters are preferably prepared for replacement.

[0014] In this way, when the type or roughness of the abrasive is changed, the bolt can be replaced with one with a different diameter through hole, making it easy to change the abrasive. Moreover, by selecting a bolt with an optimal diameter through hole, it is easy to respond to changes in the working environment conditions such as temperature and humidity. Even if the through hole of the bolt becomes clogged, the clogging can be easily eliminated by cleaning the through hole from the outside or by replacing the entire bolt with a new one.

[0015] It is also desirable to have a connecting section connecting the inside of the work chamber with the inside of the abrasive tank, a blocking body for blocking the abrasive tank side outlet of the connecting section in an openable and closable manner, an operating means operable inside or outside the work chamber for moving the blocking body in a blocked state downward to open the abrasive tank side outlet of the connecting section, and a viewing window section provided on the abrasive tank to allow the inside of the abrasive tank to be visually observed and blocked by a removable closing lid having a glass window.

[0016] According to this configuration, the amount of abrasive in the abrasive tank can be visually checked through the glass window of the sight glass section provided in the abrasive tank, so that if the worker determines that there is not much abrasive in the abrasive tank, the operator can operate the operating means to move the blocking body downward to open the abrasive tank side outlet of the connecting section and drop the abrasive accumulated in the work chamber into the abrasive tank. At this time, since the operating means is provided so as to be operable both inside and outside the work chamber, the worker can operate the operating means either inside or outside the work chamber, whichever is easier, and this prevents a decrease in work efficiency.

[0017] The blocking body may be detachably attached to the lower end of a cord-like body connected to the operating means.

[0018] By doing so, when an abnormality occurs such as the blocking body being scraped off by the abrasive and being unable to block the connection, the worker can visually check the abnormality of the blocking body through the sight window, and by removing the closing cover of the sight window, the blocking body alone in the abrasive tank can be removed from the wire-like body and easily replaced. Here, the wire-like body may be, for example, a chain or a hard string.

[0019] It is also preferable that a pressure meter and a pressure regulating throttle valve for the compressed air by the compressed air supply means be disposed on the outer surface of the working chamber near the insertion opening.

[0020] This allows the operator to easily check whether the compressed air pressure is at an optimum level by looking at the pressure meter displayed on the outside of the work chamber, and since the pressure cooking throttle valve is also disposed on the outside of the work chamber, when it is determined that pressure adjustment is necessary, the operator can easily operate the pressure cooking throttle valve to adjust the pressure.

[0021] In addition, a flexible cover member is provided at the insertion opening to prevent the abrasive material and dust in the work chamber from leaking to the outside, and the worker can insert his / her arm into the work chamber through the cover member.

[0022] In this case, the cover member can prevent the abrasive and dust in the work chamber from leaking to the outside, thereby preventing the work environment from deteriorating. Effect of the Invention

[0023] According to the present invention, compressed air is not discharged outside the working chamber or the abrasive tank, and it is possible to prevent the deterioration of the working environment caused by the dust of the workpiece during blast processing being discharged together with the compressed air. In addition, the compressor for the compressed air supply means can be a small output compressor instead of the conventional high output compressor, and since the abrasive is circulated, it is not necessary to prepare abrasive for refilling as in the conventional method, and therefore costs can be reduced. [Brief description of the drawings]

[0024] [Figure 1] 1 is a perspective view of an embodiment of a blast processing device according to the present invention. FIG. [Diagram 2] FIG. 2 is a front view showing the external appearance of the main part of FIG. [Diagram 3] FIG. 2 is a front view showing the schematic configuration of FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 2 is a side view of the abrasive tank. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. 2 is a cutaway side view of the mixing means. [Figure 11] FIG. 11 is a cross-sectional view of a bolt having holes of different diameters used as a mixing means. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] An embodiment of a blast processing device of the present invention will be described with reference to Figs.

[0026] (Device configuration) Figures 1 to 3 show a blast processing device 1, which comprises a base 2 having four leg members 2a, a housing-like work chamber 3 fixedly attached to the base 2, an abrasive tank 4 connected to the lower center of the work chamber 3, a compressed air supply means 6 which supplies compressed air to the work chamber 3 and an injection nozzle (hereinafter also simply referred to as "nozzle") 5, and a collection means 7 which collects dust from the workpiece generated by blast processing.

[0027] Both the left and right sides of the work chamber 3 are formed by doors 10 that can be opened and closed by a pair of hinges 9 at the rear end, and a transparent work window 11 that can be opened and closed is provided in the upper half of the front of the work chamber 3 to allow the worker to visually check the inside.

[0028] Furthermore, two circular insertion openings 12 are formed below the work window 11 of the work chamber 3, and the worker can insert both arms into the work chamber 3 through both insertion openings 12 and perform work in the work chamber 3 while holding the workpiece and the nozzle 5 inserted through the insertion openings 12. Here, a cover member (not shown) like an arm cover having a flexible tip made of rubber or the like is attached to both insertion openings 12, and when the worker puts his / her arms through the cover member, his / her hands can be exposed in the work chamber 3. Therefore, even if the worker performs work with his / her hands exposed in the work chamber 3, the cover member can prevent the abrasive and dust (described in detail later) in the work chamber 3 from leaking out to the outside.

[0029] An inverted cone-shaped hopper 3a as shown in Figures 2 and 3 is integrally provided at the bottom of the work chamber 3, and the upper end of the abrasive tank 4 is removably attached to the lower end of the hopper 3a. At this time, the lower end of the hopper 3a is connected to the upper part of the abrasive tank 4, and a cylindrical connector 14 is connected to the lower end of the hopper 3a (see Figure 2). By arranging the connector 14 at the upper part of the abrasive tank 4, the inside of the hopper 3a and the inside of the abrasive tank 4 are connected, and the abrasive used in the blasting process is collected in the hopper 3a and falls into the abrasive tank 4 through the connector 14.

[0030] Meanwhile, a spherical blocking body 15 is provided to freely close and open the underside of the connecting part 14, which is the outlet on the abrasive tank 4 side, and the worker operates the operating means 16 to move the blocking body 15, thereby enabling the underside of the connecting part 14 to be opened and closed.

[0031] That is, as shown in Figures 2 and 4, the operating means 16 comprises a rotating bar 16a that penetrates the upper end of the hopper 3a from left to right and is supported on the hopper 3a so as to be rotatable with its left end exposed to the outside of the hopper 3a, a ring body 16b that is attached to approximately the center of the rotating bar 16a and around which a rod-shaped body described later is wound, a rod-shaped body 16c consisting of a chain that is wound around the ring body 16b with its upper end fixed and extends downward from the ring body 16b, and has a blocking body 15 removably attached to the tip of its lower end, a link portion 16d that is attached to the left end of the rotating bar 16a exposed from the hopper 3a, an internal operating lever 16e that is arranged inside the work chamber 3 and has its left end exposed to the outside of the work chamber 3 and connected to the upper end of the link portion 16d, and an external operating lever 16f that is arranged outside the work chamber 3 and connected to the front end of a third link member described later of the link portion 16d so as to be linked to the internal operating lever 16e. The external operating lever 16f may be connected to the front end of a second link member of the link portion 16d (described later) and connected to the left end of the pivot bar 16a. The guide member 16c may be made of a material that is not easily worn out, such as a chain or a hard string, and in the case of a chain, the ring member 16b may be in the form of a gear that meshes with the chain.

[0032] As shown in FIG. 4, the link portion 16d comprises a first link member 16d1 which is long in the vertical direction, a second link member 16d2 whose rear end is rotatably connected to the lower end of the first link member 16d1 and whose front end is fixed to the left end of the pivot bar 16a exposed to the outside of the hopper 3a, and a third link member 16d3 whose rear end is rotatably connected to the upper end of the first link member 16d1 and whose front end is fixed to the left end of the internal operating lever 16e and the right end of the external operating lever 16f.

[0033] 4, the first link member 16d1 of the link portion 16d is biased in the direction opposite to the arrow direction in Fig. 4, so that the obstruction body 15 is held in a state of blocking the lower surface of the connecting portion 14. This biasing means may be one that biases the obstruction body 15 by spring force, or one that biases the obstruction body 15 by attaching a weight heavier than the obstruction body 15 to the side of the bar-shaped body 16c wound around the upper half of the ring body 16b opposite to the obstruction body 15 side and pulling the obstruction body 15 upward with the weight of the weight.

[0034] In addition, by pulling the internal operating lever 16e or the external operating lever 16f toward the first link member 16d1 of the link portion 16d against the biasing means, that is, in the direction of the arrow in Figure 4, the pivot bar 16a rotates in the direction of the arrow in Figure 4 and the ring body 16b also rotates in the same direction, and the obstruction body 15 attached to the rod-shaped body 16c moves downward.As a result, the obstruction body 15 that was blocking the underside of the connecting portion 14 moves downward in the direction of the arrow in Figure 4 (downward), opening the underside of the connecting portion 14, and the abrasive that had accumulated in the hopper 3a falls into the abrasive tank 4 via the connecting portion 14.

[0035] A viewing window section 18 is provided on the front side of the abrasive tank 4 and is closed by a removable closing lid 18a having a glass window, allowing an operator to visually check from outside the amount of abrasive inside the abrasive tank 4 and whether or not there are any abnormalities in the blocking body 15.

[0036] Therefore, if an operator visually determines that there is little abrasive in the abrasive tank 4, the operator can operate the operating means 16 to move the blocking body 15 downward, thereby opening the bottom surface of the umbrella-shaped body 14b of the connecting part 14 and dropping the abrasive accumulated in the hopper 3a of the work chamber 3 into the abrasive tank 4, thereby replenishing the abrasive in the abrasive tank 4. Furthermore, when an abnormality occurs such that the bottom surface of the connecting part 14 cannot be blocked due to the breakage of the sieve-shaped body 16c or the blocking body 15 being scraped off by the abrasive, the operator can visually check these abnormalities through the sight window 18, and therefore, by removing the closing lid 18a of the sight window 18, the sieve-shaped body 16c in the abrasive tank 4 can be repaired by connecting it, or the blocking body 15 can be removed from the sieve-shaped body 16c and replaced.

[0037] The compressed air supply means 6 has a general configuration including a compressor, a pressure regulator, and a solenoid valve, and supplies compressed air to the working chamber 3 and the nozzle 5. A display panel 19 is disposed below both insertion openings 12 on the front side of the working chamber 3, and this display panel 19 is provided with a pressure meter that displays the pressure of the compressed air from the compressed air supply means 6, as well as a throttle valve for adjusting the pressure. In this case, it is preferable that the pressure of the compressed air in the working chamber 3 and the nozzle 5 can be adjusted separately. In addition, it is preferable to employ a foot switch that can be operated with the foot as a power switch that starts and stops the supply of compressed air.

[0038] The collection means 7 is provided on the top surface of the working chamber 3 with its interior open, and collects dust from workpieces such as glass and metal generated by blasting in the working chamber 3. Dust from workpieces generated by blasting is generally finer and lighter than abrasives, and only the dust is blown away by compressed air from the compressed air supply means 6, so the collection means 7 sucks in and collects the dust. As shown in Figures 2 and 3, a damper 20 is provided at the suction port, and the suction force can be adjusted to an appropriate level by changing the opening degree of the damper, thereby preventing the abrasives from being sucked in as a result of excessive suction.

[0039] Meanwhile, a mixing means 22 is provided in the lower part of the abrasive tank 4, in the middle of the compressed air circulation pipe 21 (see FIG. 3) from the compressed air supply means 6 to the nozzle 5, for supplying the abrasive contained in the abrasive tank 4 into the circulation pipe 21 to mix the abrasive with the compressed air. As shown in FIGS. 8 to 10, the mixing means 22 has an envelope 23 disposed to enclose a part of the circulation pipe 21 and having a space 23a between its inner surface and the outer surface of the circulation pipe 21, and a through hole 24 formed in the circulation pipe 21 inside the envelope 23 to communicate the inside of the circulation pipe 21 with the space 23a inside the envelope 23.

[0040] The envelope 23 has a hollow cylindrical shape, and the flow pipe 21 passes through the left and right closed surfaces of the envelope 23. Also, as shown in Fig. 10, a cylindrical communication part 25 that communicates the space 23a inside the envelope 23 with the inside of the abrasive tank 4 is attached to the upper center of the envelope 23, so that the abrasive in the abrasive tank 4 falls into the space 23a through the communication part 25 with the abrasive tank 4 and accumulates in the space 23a.

[0041] Furthermore, the through hole 24 is provided in the vertical direction at the center of a bolt 26 which is removably screwed into the underside of the flow pipe 21, and the bolt 26 having the through hole 24 in the vertical direction is screwed into the female thread formed on the underside of the flow pipe 21, thereby connecting the inside of the flow pipe 21 to the space 23a inside the envelope 23.

[0042] Also, as shown in Figures 9 and 10, a cylindrical insertion portion 27 for inserting the bolt 26 into the envelope 23 is provided at the lower central portion of the envelope 23, and the underside of this insertion portion 27 is sealed by an openable and closable lid 28.

[0043] When compressed air is supplied from the compressed air supply means 6 to the flow pipe 21 of the mixing means 22, negative pressure is generated in the flow pipe 21 due to the supply of compressed air, and the abrasive from the abrasive tank 4 that has accumulated in the space 23a of the enclosure 23 of the mixing means 22 is sucked into the flow pipe 21 by the negative pressure through the through hole 24 of the bolt 26 screwed into the flow pipe 21, and the abrasive and compressed air are mixed in the flow pipe 21 and supplied to the nozzle 5, where they are sprayed onto the workpiece to polish the surface of the workpiece.

[0044] Incidentally, it is desirable to prepare in advance a number of types of bolts 26 with holes 24 of different diameters for replacement, as shown in Figures 11(a) and 11(b), so that when the type or roughness of the abrasive is changed, the abrasive can be easily changed by opening the lid 28 and replacing the bolt 26 with one with a hole 24 of a different diameter, and by selecting the bolt 26 with the most suitable hole 24 diameter, it is possible to respond to changes in the working environment conditions such as temperature and humidity. Also, even if the hole 24 of the bolt 26 becomes clogged, the clogging can be eliminated by opening the lid 28 and cleaning the hole 24 with a thin, sharp tool such as an awl, or by replacing the bolt 26 with a new one.

[0045] (Blast processing operation) When engraving a name or other specified letters or a design such as a pattern on the surface of the workpiece, such as a glass bottle or glass cup, by blasting, a mask is placed on the surface of the workpiece to cover all areas except those to be removed by blasting. Then, the side door 10 of the workroom 3 is opened and the workpiece is placed in the workroom 3. The worker inserts his arm together with the nozzle 5 into the workroom 3 through the insertion opening 12, grasps the workpiece, and turns on the power switch consisting of a foot switch. Compressed air is supplied from the compressed air supply means 6 to the nozzle 5, and the abrasive mixed by the mixing means 22 is sprayed onto the workpiece by the pressure of the compressed air. The surface of the workpiece is polished except for the areas covered by the mask, and the specified letters, pattern, or other design is engraved on the surface of the workpiece.

[0046] Glass dust, which is dust generated from the workpiece during blasting, is blown away by compressed air and separated from the abrasive material, and is sucked and collected by the collecting means 7, while the abrasive material falls and accumulates in the hopper 3a.

[0047] The operator can visually check the amount of abrasive inside the abrasive tank 4 through the sight window 18 of the abrasive tank 4. When the operator determines that the amount of abrasive inside the abrasive tank 4 is getting low, he or she can operate the external operating lever 16f of the operating means 16, or operate the internal operating lever 16e inside the work chamber 3, thereby moving the blocking body 15 downward against the force of the biasing means to open the bottom of the connecting portion 14, and allowing the abrasive accumulated in the hopper 3a to fall into the abrasive tank 4.

[0048] In addition, if an abnormality occurs in the blocking body 15 making it necessary to replace it, the closing lid 18a of the sight glass section 18 can be opened and the rod-shaped body 16c in the abrasive tank 4 can be repaired by connecting it, or the blocking body 15 can be removed from the rod-shaped body 16c and replaced with a new one, and the sight glass section 18 can be closed again with the closing lid 18a, allowing the blasting operation to be continued.

[0049] When applying a design to the surface of a metal product such as a metal cup, the blasting process can be used to apply a desired design to the surface of the metal product by covering the entire surface of the workpiece with various colored film-like masks bearing predetermined characters, patterns, etc., and spraying an abrasive from the nozzle 5 along the design of the mask to remove only the mask design. It can also be used to remove unnecessary burrs from metal products.

[0050] Therefore, according to the above-mentioned embodiment, negative pressure is generated in the flow pipe 21 by the supply of compressed air from the compressed air supply means 6, and the abrasive from the abrasive tank 4 accumulated in the space 23a of the enclosure 23 of the mixing means 22 is sucked into the flow pipe 21 through the through hole 24 of the flow pipe 21 by the negative pressure, the abrasive and compressed air are mixed in the flow pipe 21 and supplied to the nozzle 5, sprayed onto the workpiece to polish the surface of the workpiece, and a design such as a predetermined letter or pattern is applied to the surface of the workpiece by blasting, so that the compressed air is not discharged outside the work chamber 3 or the abrasive tank 4, and it is possible to prevent the deterioration of the working environment due to dust.

[0051] In addition, since the compressed air is not discharged outside the work chamber 3 or the abrasive tank 4, the compressor for the compressed air supply means 6 can be a small-output compressor rather than the high-output compressor used in the past. Moreover, since the abrasive is circulated, there is no need to prepare new abrasives for use in the blasting process as in the past, which allows for significant cost reductions.

[0052] Furthermore, since the through holes 24 are provided in the bolts 26 which are detachably screwed into the flow pipe 21, by preparing in advance a plurality of types of bolts 26 with through holes 24 of different diameters for replacement, when the type or roughness of the abrasive is changed, it is possible to easily accommodate the change in the abrasive by replacing the bolts 26 with bolts 26 with through holes 24 of different diameters. Moreover, by selecting the bolts 26 with the optimal through holes 24, it is possible to easily accommodate changes in the working environment conditions such as temperature and humidity, and even if the through holes 24 of the bolts 26 become clogged, the clogging can be easily eliminated by opening the lid 28 and cleaning the through holes 24 with a thin, sharp tool such as an awl, or by replacing the bolts 26 with new bolts 26.

[0053] In addition, since the amount of abrasive in the abrasive tank 4 can be visually observed through the glass window of the sight glass section 18 provided in the abrasive tank 4, if the operator determines that there is a small amount of abrasive in the abrasive tank 4, the operator can operate the operating means 16 to move the blocking body 15 downward, thereby opening the bottom surface, which is the abrasive tank side outlet of the connecting section 14, and allowing the abrasive accumulated in the work chamber 3 to fall into the abrasive tank 4.

[0054] In addition, when opening the underside of the umbrella-shaped body 14b of the connecting portion 14, the worker need only operate the internal operating lever 16e or the external operating lever 16f of the operating means 16, whichever is easier to operate inside or outside the work chamber 3, thereby preventing a decrease in work efficiency.

[0055] In addition, when an abnormality occurs such as the blocking body 15 being worn down by the abrasive and being unable to block the connecting portion 14, the operator can visually check for the presence or absence of an abnormality in the blocking body 15 through the sight window portion 18. Therefore, by removing the closing lid 18a of the sight window portion 18, the bar-shaped body 16c can be repaired by connecting it, or only the blocking body 15 in the abrasive tank 4 can be removed from the bar-shaped body 16c and easily replaced.

[0056] In addition, a display panel 19 on which a pressure meter for the compressed air by the compressed air supply means 6 and a pressure adjustment throttle valve, etc. are arranged is provided near the insertion port 12 on the outer surface of the work chamber 3. Therefore, by looking at the display on the pressure meter on the outer surface of the work chamber 3, the worker can easily check whether the compressed air pressure is at an optimum state, and when pressure adjustment is necessary, the pressure can be adjusted by easily operating the pressure cooking throttle valve, thereby improving work efficiency.

[0057] The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

[0058] For example, in the above-described embodiment, examples were given in which the workpiece was a glass product or a metal product, but the workpiece is not limited to these, and the present invention can be applied to any material that can be blasted.

[0059] Moreover, it goes without saying that the shape of the working chamber 3 and the shape of the abrasive tank 4 are not limited to those described above.

[0060] In addition, in the above embodiment, the case where the blocking body 15 is spherical is described, but the blocking body 15 may be spherical or umbrella-shaped as long as it has a shape that can block the underside of the connecting portion 14.

[0061] The present invention can be applied to a blast processing device that blasts the surface of a workpiece by spraying abrasives together with compressed air from a spray nozzle inside a housing-shaped work chamber. [Explanation of symbols]

[0062] 1. Blasting equipment 3. Workroom 4. Abrasive tank 5...Injection nozzle 6... Compressed air supply means 7. Recovery methods 12 ... Insertion port 14...Connection part 15...obstruction body 16...Operating means 18 ... Viewport 18a…Closing lid 20…Display panel 21 Distribution Pipe 22...Mixing means 23 …envelope 24 ...Through hole 26 ... Volts

Claims

1. A blast processing device that blasts a surface of a workpiece by injecting an abrasive together with compressed air from an injection nozzle in a housing-shaped work chamber, a compressed air supply means for supplying compressed air to the working chamber and the injection nozzle; an insertion port opened in the working chamber so that a worker can insert his / her arm into the working chamber to hold the workpiece and the injection nozzle; a collecting means connected to the working chamber for collecting dust blown away by compressed air from the compressed air supplying means from a mixture of the abrasive sprayed from the spray nozzle onto the surface of the workpiece in the working chamber and dust generated when the surface of the workpiece is polished by spraying the abrasive; an abrasive tank connected to a lower portion of the working chamber and configured to contain the abrasive that falls after being sprayed from the spray nozzle onto the workpiece; a mixing means that is provided in a lower portion of the abrasive tank and in the middle of a compressed air circulation pipe from the compressed air supply means to the injection nozzle, and that supplies the abrasive contained in the abrasive tank to the circulation pipe and mixes the abrasive; The mixing means is an envelope disposed to enclose a portion of the flow pipe and having a space between an inner surface of the envelope and an outer surface of the flow pipe, the abrasive in the abrasive tank dropping through a communication portion with the abrasive tank into the space and being collected therein; a through hole provided in the flow pipe for communicating the inside of the flow pipe with the space inside the envelope; The abrasive material accumulated in the space of the envelope is sucked into the flow pipe through the through hole by a negative pressure generated in the flow pipe by the supply of compressed air from the compressed air supply means, and the abrasive material and the compressed air are mixed and supplied to the injection nozzle. A blast processing device characterized by:

2. The through hole of the mixing means is provided for a bolt that is detachably screwed into the flow pipe, A plurality of types of bolts having holes with different diameters are prepared for replacement.

2. The blast processing device according to claim 1 .

3. a connecting portion connecting the inside of the working chamber and the inside of the abrasive tank; a blocking body for blocking the abrasive tank side outlet of the connecting portion in an openable and closable manner; an operating means operable inside and outside the working chamber for lowering the blocking body in a blocked state to open the abrasive tank side outlet of the connecting portion; a viewing window section provided in the abrasive tank so that the inside of the abrasive tank can be visually observed and closed by a removable closing lid having a glass window; The blast processing device according to claim 1 or 2, further comprising:

4. 4. The blast processing device according to claim 3, wherein the blocking body is detachably attached to a lower end of the cord-like body connected by the operating means.

5. A pressure meter and a pressure regulating throttle valve for the compressed air by the compressed air supply means are disposed on the outer surface of the working chamber near the insertion port.

5. The blast processing device according to claim 4.

6. A flexible cover member is provided at the insertion port to prevent the abrasive material and the dust in the work chamber from leaking to the outside, 6. The blast processing apparatus according to claim 5, wherein the worker inserts his / her arm into the working chamber through the cover member.

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