Sand spraying machine dust removal device for precision casting shell manufacturing and sand spraying machine

Abstract

The embodiment of the utility model discloses a sand spraying machine dust removal device for a precision casting shell and a sand spraying machine. An upper sand storage hopper, a sand spraying box and a lower sand storage hopper which are sequentially arranged from top to bottom are arranged in the sand spraying machine where the dust removal device is applied; a dust collection box of the sand spraying box dust collection mechanism is arranged in a sand spraying box, a dust suction opening with a sand blocking structure is formed in the dust collection box and used for blocking sand in the sand spraying box from being sucked into the dust collection box, and the dust collection box is connected to a dust remover through a collection pipeline and a main dust removal pipeline and used for collecting dust in the sand spraying box. One side wall plate of the upper sand storage hopper is provided with a dust collection pipeline interface, and the dust collection pipeline interface is connected to a dust remover through an upper sand storage hopper dust removal pipeline and a main dust removal pipeline and is used for collecting floating dust in the upper sand storage hopper. According to the technical scheme provided by the utility model, the problems that a mold shell is easy to crack and scrap during later dewaxing roasting due to the fact that the bonding strength between the sand and slurry is seriously reduced due to the fact that the dust in the sand is large in the existing sand spraying operation and the mold shell is easy to crack and scrap during later dewaxing roasting are solved, and the environment is deteriorated due to the large dust; and the occupational health of operators is influenced.

Description

Technical Field

[0001] The utility model relates to, but is not limited to, the field of casting technology, mainly belonging to the field of precision casting shell production, and particularly refers to a dust removal device and a sand spraying machine for precision casting shell making. Background Art

[0002] In precision casting, the mold shell is usually obtained through multiple cycles of dipping in viscous slurry, spraying sand, drying, then dipping again, spraying sand and drying. Since the slurry on the workpiece surface is thin and dries quickly, the sand needs to be sprayed onto the workpiece within a short time to form a tight bond between the workpiece and the slurry.

[0003] However, due to a large amount of powder in the sand, there is a lot of dust during sand spraying, which causes the following problems in sand spraying operations: on the one hand, the dust in the sand spraying operation adheres to the slurry on the workpiece surface, seriously reducing the bonding strength between the sand and the slurry, resulting in easy cracking and scrapping of the mold shell during subsequent dewaxing and roasting; on the other hand, the large amount of dust deteriorates the environment and affects the occupational health of operators. Summary of the Utility Model

[0004] The purpose of the utility model: To solve the above technical problems, the embodiments of the utility model provide a dust removal device and a sand spraying machine for precision casting shell making, so as to solve the problems that in the existing sand spraying operation, due to a large amount of dust in the sand, the dust adheres to the slurry on the workpiece surface, seriously reducing the bonding strength between the sand and the slurry, resulting in easy cracking and scrapping of the mold shell during subsequent dewaxing and roasting, and the large amount of dust deteriorates the environment and affects the occupational health of operators.

[0005] The technical solution of the utility model: The embodiments of the utility model provide a dust removal device for a sand spraying machine for precision casting shell making, including: a dust collection mechanism 5-1 for the sand spraying box, a dust removal pipeline 5-2 for the upper sand storage hopper, a main dust removal pipeline 7, and a dust collector 8;

[0006] Among them, in the sand spraying machine to which the dust removal device is applied, there are an upper sand storage hopper 1, a sand spraying box 2, and a lower sand storage hopper 3 arranged in sequence from top to bottom; the dust collection box of the dust collection mechanism 5-1 for the sand spraying box is arranged in the sand spraying box 2, and a plurality of dust suction ports are opened on the dust collection box, and a sand blocking structure is arranged at each dust suction port for blocking the sand in the sand spraying box 2 from being sucked into the dust collection box 5-1a when absorbing dust. The dust collection box 5-1a is connected to the dust collector 8 through a collection pipeline 5-1b and the main dust removal pipeline 7, and is used for collecting the dust in the sand in the sand spraying box 2 by using the dust collection box 5-1a during the sand spraying process of the workpiece, and sucking the dust in the dust collection box 5-1a into the dust collector 8 through the collection pipeline 5-1b and the main dust removal pipeline 7 in sequence;

[0007] One side wall plate of the upper sand storage hopper 1 is provided with a dust suction pipeline interface. One end of the dust removal pipeline 5-2 of the upper sand storage hopper is connected to the dust suction pipeline interface of the upper sand storage hopper 1, and the other end is sequentially connected to the dust collector 8 through the main dust removal pipeline 7, so as to utilize the pressure difference to suck the dust in the upper sand storage hopper 1 into the dust collector 8 through the upper sand storage hopper dust removal pipeline 5-2 and the main dust removal pipeline 7 in the process of lifting the sand in the lower sand storage hopper 3 to the upper sand storage hopper 1 by the sand lifting machine 4.

[0008] Optionally, in the sand spraying machine dust removal device for precision casting shell making as described above,

[0009] The dust collection mechanism 5-1 of the sand spraying box includes two dust collection boxes 5-1a forming a mirror-symmetrical structure. The two dust collection boxes 5-1a are symmetrically and adhesively installed on the inner sides of the opposite side plates in the sand spraying box 2 with their dust collection box sections. The transfer box sections corresponding to the two dust collection box sections are communicated through the collection pipeline 5-1b outside the sand spraying box 2, forming a dust collection mechanism 5-1 of the sand spraying box with an overall U-shaped structure.

[0010] Optionally, in the sand spraying machine dust removal device for precision casting shell making as described above,

[0011] The dust collection box sections of the dust collection boxes 5-1a in the dust collection mechanism 5-1 of the sand spraying box are set as thin body box sections with the same box plane as the side plate of the sand spraying box 2 and a size smaller than that of the side plate of the sand spraying box 2, and are adhesively installed on the side plate at the corresponding position of the sand spraying box 2 with the box plane of the dust collection box section.

[0012] Optionally, in the sand spraying machine dust removal device for precision casting shell making as described above,

[0013] A plurality of dust suction ports arranged in a matrix are formed on the inner side wall plate of the dust collection box section. Each dust suction port is set as a labyrinth inlet structure, and is used to block the sand material with a particle size much larger than that of the dust in the sand spraying box 2 outside the dust suction port during the process of absorbing dust.

[0014] Optionally, in the sand spraying machine dust removal device for precision casting shell making as described above, it further includes: a dust removal valve 6 arranged on the main dust removal pipeline 7;

[0015] The opening and closing state of the automatic control opening and closing dust removal valve 6 is controlled according to the opening and closing state of the sand spraying machine, and is used to open before the sand spraying machine performs the sand spraying operation, and close the dust removal valve 6 after the sand spraying of the sand spraying machine ends and the dust floating in the upper sand storage hopper 1 is completely collected.

[0016] An embodiment of the present invention further provides a sand spraying machine for precision casting shell making, including: an upper sand storage hopper 1, a sand spraying box 2, a lower sand storage hopper 3, a sand lifting machine 4 and a dust removal device 5;

[0017] Among them, the upper sand storage hopper 1, the sand spraying box 2, and the lower sand storage hopper 3 are arranged in sequence from top to bottom to form an integrated sand spraying housing. A sand elevator 4 is provided on one side of the upper sand storage hopper 1 and the lower sand storage hopper 3, externally connecting the sand outlet of the lower sand storage hopper 3 and the sand inlet of the upper sand storage hopper 1, and is used to convey sand materials from the lower sand storage hopper 3 to the upper sand storage hopper 1 to achieve bucket lifting and sand replenishment for sand spraying;

[0018] The dust removal device 5 is set as the dust removal device for sand spraying machines used in precision casting shell making as described in any one of claims 1 to 5. The dust collection box 5-1a of the sand spraying box dust collection mechanism 5-1 in the dust removal device 5 is arranged in the sand spraying box 2. The dust collection box 5-1a is connected to the dust collector 8 through a collection pipeline 5-1b and a main dust removal pipeline 7, and is used to collect the dust in the sand spraying box 2;

[0019] One end of the upper sand storage hopper dust removal pipeline 5-2 in the dust removal device 5 is connected to the dust suction pipeline interface of the upper sand storage hopper 1, and the other end is connected to the dust collector 8 through the main dust removal pipeline 7 in sequence, and is used to collect the scattered dust in the upper sand storage hopper 1.

[0020] The beneficial effects of the present utility model: The dust removal device and the sand spraying machine for precision casting shell making provided by the embodiments of the present utility model install a sand spraying box dust collection mechanism 5-1 in the sand spraying box 2, and increase a dust suction pipeline interface in the upper sand storage hopper 1 to connect the upper sand storage hopper dust removal pipeline 5-2. The sand spraying box dust collection mechanism 5-1 and the upper sand storage hopper dust removal pipeline 5-2 are respectively connected to the dust collector 8 through the main dust removal pipeline 7. The dust removal device of the sand spraying machine with the above structure collects most of the dust during the bucket lifting and sand replenishment for sand spraying stage, reduces the amount of dust floating during the sand spraying stage, and combines with the sand spraying box dust collection mechanism 5-1 installed in the sand spraying box 2 to effectively reduce dust spillage, and greatly reduces the impact of dust on the sand spraying quality of workpieces. In addition, the dust is recovered by the suction of the fan of the dust collector 8, achieving the purpose of efficiently collecting the dust generated during the sand spraying process and the bucket lifting and sand replenishment process of the sand spraying machine. Further, the sand spraying box dust collection mechanism 5-1 is integrally set as a U-shaped structure, and dust suction ports are configured on multiple sides, and the dust suction ports adopt a labyrinth inlet structure, which can effectively reduce the possibility of sucking sand materials due to suction when absorbing dust, thereby reducing the loss of sand materials during dust removal. The technical solutions provided by the embodiments of the present utility model achieve the following beneficial effects:

[0021] (1) Achieved the purpose of efficiently collecting dust during the sand spraying process;

[0022] (2) The dust removal device of the sand spraying machine provided by the embodiments of the present utility model has a simple structure, low cost, and is convenient for maintenance;

[0023] (3) It realizes the dust collection of the upper sand storage hopper 1 for replenishing sand and the dust generated during the process of the bucket elevator lifting sand for sand replenishment. Specifically, during the process of the bucket elevator lifting sand for sand replenishment, it can efficiently collect the overflowing dust generated when the upper sand storage hopper 1 lifts sand, thus avoiding the reappearance of the dust generated by sand lifting in the upper sand storage hopper 1 during the sand pouring process again, and reducing the impact on the quality of the shell making process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0025] Figure 1 It is a schematic structural diagram of the dust removal device for a sand pouring machine for precision casting shell making provided by an embodiment of the present invention applied to a sand pouring machine;

[0026] Figure 2 For Figure 1 It is a top view of the component structure in the dust removal device for a sand pouring machine for precision casting shell making provided by the shown embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the embodiments of the present invention will be described in detail below with reference to the drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0028] As described in the above background art, in precision casting, the mold shell usually needs to go through multiple operations of spraying and hanging sand materials (simply referred to as sand pouring); and the problems existing in the existing sand pouring operation process are described. Specifically, before casting, the castings of investment casting need to produce mold shells, and the production of mold shells is realized by repeatedly circulating the processes of dipping slurry, pouring sand, and drying on the surface of the wax mold. When using a sand pouring machine for sand pouring / sanding, due to a certain powder mass ratio of the refractory materials used, a large amount of dust will be generated, seriously affecting the quality of sand coating, and at the same time having an adverse impact on the working environment and occupational health of workers.

[0029] In an auxiliary device for reducing the dust of a sand pouring machine provided by the existing patent CN203417900U, three-sided dust suction ports are added at the filter screen of the lower sand hopper of the sand pouring machine, and 2 layers of staggered filter screens are added in front of the ports. This auxiliary device can only remove dust when starting sand pouring each time. In a patent for a dust removal type sand pouring machine provided by the existing patent CN206794330U, a wind curtain is added at the sand pouring inlet of the sand pouring machine to avoid dust overflow and play a role in isolating dust, but it does not completely absorb the dust.

[0030] To solve the problem of the influence of dust on the quality of the mold shell during the sand spraying process, and to achieve the purpose of reducing dust spillage and improving the working environment, it is a necessary way to add a dust removal device during the sand spraying operation; based on the above problems and technical requirements, the embodiments of the present invention provide a dust removal device for a sand spraying machine for precision casting shell making and a sand spraying machine. Using this device can achieve the purpose of efficiently collecting the dust generated during the sand spraying process, sand lifting process, and sand storage process of the sand spraying machine.

[0031] The present invention provides the following specific embodiments that can be combined with each other. For the same or similar concepts or processes, they may not be described in some embodiments.

[0032] Figure 1 It is a schematic structural diagram of the application of a dust removal device for a sand spraying machine for precision casting shell making provided by the embodiment of the present invention on the sand spraying machine. Figure 2 For Figure 1 The top view of the component structure in the dust removal device of the sand spraying machine provided by the shown embodiment. As Figure 1 And Figure 2 As shown, the dust removal device for a sand spraying machine for precision casting shell making provided by the embodiment of the present invention includes: a dust collection mechanism 5-1 for the sand spraying box, a dust removal pipeline 5-2 for the upper sand storage hopper, a main dust removal pipeline 7, and a dust collector 8.

[0033] As Figure 1 The dust removal device of the sand spraying machine shown and the sand spraying machine to which this device is applied. In the sand spraying machine, there are an upper sand storage hopper 1, a sand spraying box 2, and a lower sand storage hopper 3 arranged in sequence from top to bottom; in addition, there is also a sand lifting machine 4 for lifting the sand in the lower sand storage hopper 3 to the upper sand storage hopper 1.

[0034] In the dust removal device of the sand spraying machine provided by the embodiment of the present invention, the dust collection box of the dust collection mechanism 5-1 for the sand spraying box is arranged in the sand spraying box 2, and a plurality of dust suction ports are opened on the dust collection box, and a sand blocking structure is arranged at each dust suction port. This is used to block the sand in the sand spraying box 2 from being sucked into the dust collection box 5-1a when absorbing dust. The dust collection box 5-1a is connected to the dust collector 8 through a collection pipeline 5-1b. This dust collection mechanism 5-1 for the sand spraying box is used to collect the dust in the sand spraying box 2.

[0035] It should be noted that the sand spraying box 2 is located between the upper sand storage hopper 1 and the lower sand storage hopper 3. Its function is that during the sand spraying process of the workpiece, the sand material forms a rain-like fall in the sand spraying box 2 to coat the surface of the workpiece with the sand material.

[0036] In the sand spraying machine dust removal device provided by the embodiment of the present utility model, a dust suction pipeline interface is provided on one side wall plate of the upper sand storage hopper 1. One end of the upper sand storage hopper dust removal pipeline 5-2 is connected to the dust suction pipeline interface of the upper sand storage hopper 1, and the other end is sequentially connected to the dust collector 8 through the main dust removal pipeline 7. The upper sand storage hopper dust removal pipeline 5-2 is used to collect the floating dust in the upper sand storage hopper 1.

[0037] Based on the structural form of the sand spraying machine dust removal device provided by the embodiment of the present utility model, the sand spraying machine dust removal device provided by the embodiment of the present utility model has the following dust collection effect:

[0038] On the one hand, the dust collection working mode of the sand spraying box dust collection mechanism 5-1 in the embodiment of the present utility model is as follows: during the sand spraying process of the mold shell, the dust in the sand material in the sand spraying box 2 is collected by the dust collection box 5-1a, and the dust in the dust collection box 5-1a is sequentially sucked into the dust collector 8 through the collection pipeline 5-1b and the main dust removal pipeline 7.

[0039] On the other hand, the dust collection working mode of the upper sand storage hopper dust removal pipeline 5-2 in the embodiment of the present utility model is as follows: during the process of lifting the sand material in the lower sand storage hopper 3 to the upper sand storage hopper 1 by the sand lifting machine 4, since the sand lifting process of the sand lifting machine 4 uses the digging bucket 4-1 to carry the sand material into the upper sand storage hopper 1, at this time, the dust in the sand material will float out during the falling process of the sand material. Therefore, the upper sand storage hopper dust removal pipeline 5-2 is connected through the dust suction pipeline interface opened on the side plate of the upper sand storage hopper 1, so that the dust in the upper sand storage hopper 1 can be sequentially sucked into the dust collector 8 through the upper sand storage hopper dust removal pipeline 5-2 and the main dust removal pipeline 7; during this dust removal process, the dust in the closed upper sand storage hopper 1 is specifically sucked into the dust collector 8 through the main dust removal pipeline 7 by using the pressure difference.

[0040] On the other hand, the dust is recovered by the suction of the fan of the dust collector 8, so as to achieve the purpose of efficiently collecting the dust generated during the sand spraying process and the bucket lifting sand replenishment process of the sand spraying machine.

[0041] In one implementation manner of the embodiment of the present utility model, as Figure 2 shown, the sand spraying box dust collection mechanism 5-1 includes 2 dust collection boxes 5-1a forming a mirror-symmetrical structure. The 2 dust collection boxes 5-1a are symmetrically and adhesively installed on the inner sides of the opposite side plates in the sand spraying box 2 with their dust collection box sections, and the transfer box sections corresponding to the 2 dust collection box sections are connected through the collection pipeline 5-1b outside the sand spraying box 2, forming a sand spraying box dust collection mechanism 5-1 with an overall U-shaped structure.

[0042] In the specific implementation of this implementation manner, refer to Figure 1 and Figure 2As shown, the dust collection mechanism 5-1 of the U-shaped sand spraying box can not only increase the contact area between the overall mechanism and the dust in the sand spraying box 2, but also efficiently achieve the dust collection effect. The U-shaped structure design can also avoid the installation space of the sand elevator 4. For example, the sand elevator 4 is installed on one side of the upper sand storage hopper 1 and the lower sand storage hopper 3 close to the dust collector 8, which is exactly located within the surrounding area of the U-shaped structure.

[0043] Furthermore, referring to Figure 1 and Figure 2 As shown, in the dust collection mechanism 5-1 of the sand spraying box, the dust collection box section of each dust collection box 5-1a is set as a thin box section with the box plane the same as the side plate of the sand spraying box 2 and the size smaller than the side plate of the sand spraying box 2, and is used to be installed on the side plate at the corresponding position of the sand spraying box 2 by attaching the box plane of the dust collection box section.

[0044] In specific implementation, referring to Figure 1 and Figure 2 As shown, a plurality of dust suction ports arranged in a matrix are formed on the inner side wall plate of the dust collection box section, and each dust suction port is set as a labyrinth inlet structure, which is used to block the sand material with a particle size much larger than the dust in the sand spraying box 2 outside the dust suction port during the process of absorbing dust.

[0045] In an implementation manner of the embodiment of the present utility model, as Figure 1 shown, the sand spraying machine dust removal device may further include: a dust removal valve 6 provided on the main dust removal pipeline 7.

[0046] In this implementation manner, the opening and closing state of the automatic control of the dust removal valve 6 is controlled according to the opening and closing state of the sand spraying machine, and is used to be opened before the sand spraying machine performs the sand spraying operation, and the dust removal valve 6 is closed after the sand spraying of the sand spraying machine ends and the dust scattered in the upper sand storage hopper 1 is collected.

[0047] In an optional implementation scheme, a dust removal valve 6 controlled by electricity or pneumatic is provided on the main dust removal pipeline 7, and the opening and closing state of the dust removal valve 6 in the main dust removal pipeline 7 is controlled according to the opening and closing condition of the sand spraying machine, so as to achieve efficient dust collection.

[0048] The dust removal device for the sand spraying machine used in precision casting shell making provided by the embodiment of the utility model installs a dust collection mechanism 5-1 for the sand spraying box in the sand spraying box 2, and adds a dust suction pipe interface in the upper sand storage hopper 1 to connect to the dust removal pipe 5-2 for the upper sand storage hopper. The dust collection mechanism 5-1 for the sand spraying box and the dust removal pipe 5-2 for the upper sand storage hopper are respectively connected to the dust collector 8 through the main dust removal pipe 7. For the dust removal device of the sand spraying machine adopting the above structure, most of the dust is collected during the bucket elevator sand lifting and sand replenishing stage, reducing the amount of dust floating during the sand spraying stage. Combining with the dust collection mechanism 5-1 installed in the sand spraying box 2 can effectively reduce the dust overflow and greatly reduce the influence of dust on the sand spraying quality of the workpiece. In addition, the dust is recovered by the suction of the fan of the dust collector 8, achieving the purpose of efficiently collecting the dust generated during the sand spraying process and the bucket elevator sand lifting and sand replenishing process of the sand spraying machine. Further, the dust collection mechanism 5-1 for the sand spraying box is integrally arranged in a U-shaped structure, and dust suction ports are configured on multiple sides, and the dust suction ports adopt a labyrinth inlet structure, which can effectively reduce the possibility of sucking sand materials due to the suction force when absorbing dust, thereby reducing the loss of sand materials during dust removal.

[0049] Based on the dust removal device for the sand spraying machine used in precision casting shell making provided by the embodiment of the utility model, the embodiment of the utility model also provides a sand spraying machine for precision casting shell making. The structure of the sand spraying machine is as Figure 1 and Figure 2 shown. The structural composition of the sand spraying machine provided by the embodiment of the utility model may include: an upper sand storage hopper 1, a sand spraying box 2, a lower sand storage hopper 3, a sand lifting machine 4, and a dust removal device 5.

[0050] As Figure 1 and Figure 2 shown in the structure of the sand spraying machine, the upper sand storage hopper 1, the sand spraying box 2, and the lower sand storage hopper 3 are arranged in sequence from top to bottom, for example, forming an integrated sand spraying shell structure as Figure 1 shown, and the upper sand storage hopper 1 is communicated with the sand spraying box 2, and the sand spraying box 2 is communicated with the lower sand storage hopper 3.

[0051] As Figure 1 shown, the upper sand storage hopper 1 is located at the top of the overall sand spraying machine. The sand lifting machine 4 externally communicates the sand outlet of the lower sand storage hopper 3 and the sand inlet of the upper sand storage hopper 1. The upper sand storage hopper 1 and the lower sand storage hopper 3 realize the upward transportation and sand replenishment of sand materials through the sand lifting machine 4 outside the shell structure. The sand spraying box 2 is located between the upper sand storage hopper 1 and the lower sand storage hopper 3. Its function is that during the sand spraying process of the workpiece, the sand materials form a rain-like fall in the sand spraying box 2 to coat the surface of the workpiece with sand materials. Moreover, the sand materials falling down fall into the lower sand storage hopper 3 and are replenished into the upper sand storage hopper 1 through the sand lifting machine 4.

[0052] In the dust removal device 5 in the embodiment of the present utility model, the dust removal device for the sand spraying machine in the precision casting shell making provided in any of the above embodiments is adopted. The dust collection box 5-1a of the dust collection mechanism 5-1 in the sand spraying box of the dust removal device 5 is arranged in the sand spraying box 2. The dust collection box 5-1a is connected to the dust collector 8 through the collection pipeline 5-1b and the main dust removal pipeline 7, so as to realize the dust collection of the sand spraying box 2. In addition, one end of the dust removal pipeline 5-2 of the upper sand storage hopper is connected to the dust suction pipeline interface of the upper sand storage hopper 1, and the other end is sequentially connected to the dust collector 8 through the main dust removal pipeline 7, so as to realize the collection of the scattered dust in the upper sand storage hopper 1.

[0053] In the sand spraying machine provided in the embodiment of the present utility model, part of the structure is the dust collection mechanism 5-1 in the sand spraying box 2. The whole adopts a U-shaped structure, and the dust suction port adopts a labyrinth structure, which can effectively reduce the possibility of sucking sand materials due to suction when absorbing dust. In addition, since the sand lifting process of the sand lifting machine 4 uses the digging bucket 4-1 to carry sand materials and lift them into the upper sand storage hopper 1, at this time, the dust in the sand materials will float out during the falling process of the sand materials; for the dust floating in the upper sand storage hopper 1 during the process of lifting and replenishing sand by the bucket elevator, by forming a dust collection pipeline interface on the side plate of the upper sand storage hopper 1 and connecting the dust removal pipeline 5-2 of the upper sand storage hopper, the dust floating in the upper sand storage hopper 1 can be sucked into the main dust removal pipeline 7 by using the pressure difference and then sucked into the dust collector 8 along the main dust removal pipeline 7.

[0054] The dust removal method of the sand spraying machine for precision casting shell making provided in the embodiment of the present utility model is as follows: before the sand spraying machine starts, the dust collector 8 and the dust removal valve 6 are turned on in advance. The sand materials fall in a rain-like manner in the sand spraying box 2, and the dust floating out during the falling process is collected in real time by the dust collection mechanism 5-1 in the sand spraying box 2 installed in the sand spraying box 2; at the same time, during the process of the sand spraying machine lifting and replenishing sand to the upper sand storage hopper 1, the dust generated during the process of lifting sand by the digging bucket 4-1 is sucked into the main dust removal pipeline 7 through the dust removal pipeline 5-2 communicated with the upper sand storage hopper 1; after the sand spraying and sand discharging are completed, the dust removal valve 6 is closed after a delay, specifically, after the dust floating in the upper sand storage hopper 1 is completely collected, the dust removal valve is closed.

[0055] By adopting the dust removal device and the sand spraying machine for precision casting shell making provided in the embodiment of the present utility model, the purpose of efficient dust collection during the sand spraying process is realized; and the dust removal device of the sand spraying machine provided in the embodiment of the present utility model has a simple structure, low cost and convenient maintenance; the dust collection of the upper sand storage hopper 1 for replenishing sand and the dust during the process of lifting and replenishing sand by the bucket elevator is realized, specifically, the dust overflowing during the sand lifting process in the upper sand storage hopper 1 is efficiently collected, thereby avoiding the reappearance of the dust generated by sand lifting in the upper sand storage hopper 1 during the sand spraying process again, and reducing the influence on the shell making quality during the shell making process.

[0056] Although the embodiments disclosed by the present utility model are as above, the content is only the embodiments adopted for facilitating the understanding of the present utility model and is not intended to limit the present utility model. Any person skilled in the art within the field to which the present utility model pertains may make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed by the present utility model. However, the scope of patent protection of the present utility model shall still be subject to the scope defined by the appended claims.

Claims

1. A dust removal device for a sand spraying machine used in precision casting shell making, characterized in that, Including: The dust collection mechanism (5-1) of the sand spraying box, the dust removal pipeline (5-2) of the upper sand storage hopper, the main dust removal pipeline (7) and the dust collector (8); Among them, in the sand spraying machine to which the dust removal device is applied, there are an upper sand storage hopper (1), a sand spraying box (2) and a lower sand storage hopper (3) arranged in sequence from top to bottom; the dust collection box of the dust collection mechanism (5-1) of the sand spraying box is arranged in the sand spraying box (2), and a plurality of dust suction ports are opened on the dust collection box, and a sand blocking structure is arranged at each dust suction port for blocking the sand material in the sand spraying box (2) from being sucked into the dust collection box (5-1a) when absorbing dust. The dust collection box (5-1a) is connected to the dust collector (8) through a collection pipeline (5-1b) and the main dust removal pipeline (7), and is used for collecting the dust in the sand material in the sand spraying box (2) by using the dust collection box (5-1a) during the sand spraying process of the workpiece, and sucking the dust in the dust collection box (5-1a) into the dust collector (8) through the collection pipeline (5-1b) and the main dust removal pipeline (7) in sequence; One side wall plate of the upper sand storage hopper (1) is provided with a dust suction pipeline interface. One end of the dust removal pipeline (5-2) of the upper sand storage hopper is connected to the dust suction pipeline interface of the upper sand storage hopper (1), and the other end is connected to the dust collector (8) through the main dust removal pipeline (7) in sequence, and is used for sucking the dust in the upper sand storage hopper (1) into the dust collector (8) through the dust removal pipeline (5-2) of the upper sand storage hopper and the main dust removal pipeline (7) in sequence by using the pressure difference during the process of lifting the sand material in the lower sand storage hopper (3) to the upper sand storage hopper (1) by the sand lifting machine (4).

2. The dust removal device for a sand spraying machine used in precision casting shell making according to claim 1, wherein The dust collection mechanism (5-1) of the sand spraying box includes 2 dust collection boxes (5-1a) forming a mirror-symmetrical structure. The 2 dust collection boxes (5-1a) are symmetrically and closely attached to the inner sides of the opposite side plates in the sand spraying box (2) with their dust collection box sections, and the transfer box sections corresponding to the 2 dust collection box sections are communicated through a collection pipeline (5-1b) outside the sand spraying box (2), forming a dust collection mechanism (5-1) of the sand spraying box with an overall U-shaped structure.

3. The dust removal device for a sand spraying machine used in precision casting shell making according to claim 2, wherein The dust collection box section of each dust collection box (5-1a) in the dust collection mechanism (5-1) of the sand spraying box is set as a thin body box section with the same box plane as the side plate of the sand spraying box (2) and a size smaller than the side plate of the sand spraying box (2), and is used for closely attaching and installing on the side plate at the corresponding position of the sand spraying box (2) with the box plane of the dust collection box section.

4. The dust removal device for a sand spraying machine used in precision casting shell making according to claim 3, wherein A plurality of dust suction ports arranged in a matrix are formed on the inner side wall plate of the dust collection box section, and each dust suction port is set as a labyrinth inlet structure for blocking the sand material with a particle size much larger than the dust in the sand spraying box (2) outside the dust suction port during the process of absorbing dust.

5. The sand spraying machine dust removal device for precision casting shell making according to any one of claims 1 to 4, characterized in that, It further includes: A dust removal valve (6) provided on the main dust removal pipeline (7); The opening and closing state of the dust removal valve (6) is automatically controlled according to the on / off state of the sand spraying machine. It is opened before the sand spraying machine performs the sand spraying operation and closed after the sand spraying of the sand spraying machine ends and the dust scattered in the upper sand storage hopper (1) is collected.

6. A sand spraying machine for precision investment casting shell making, characterized in that, It includes: an upper sand storage hopper (1), a sand spraying box (2), a lower sand storage hopper (3), a sand lifter (4) and a dust removal device (5); Among them, the upper sand storage hopper (1), the sand spraying box (2), and the lower sand storage hopper (3) are arranged in sequence from top to bottom to form an integrated sand spraying housing. The sand lifter (4) arranged on one side of the upper sand storage hopper (1) and the lower sand storage hopper (3) externally connects the sand outlet of the lower sand storage hopper (3) and the sand inlet of the upper sand storage hopper (1) to transport the sand material from the lower sand storage hopper (3) to the upper sand storage hopper (1) to achieve bucket lifting and sand replenishment. The dust removal device (5) is set as the dust removal device for sand spraying machines used in precision casting shell making as described in any one of claims 1 to 5. The dust collection box (5-1a) of the dust collection mechanism (5-1) for the sand spraying box in the dust removal device (5) is arranged in the sand spraying box (2). The dust collection box (5-1a) is connected to the dust collector (8) through a collection pipeline (5-1b) and a main dust removal pipeline (7) to collect the dust in the sand spraying box (2). One end of the upper sand storage hopper dust removal pipeline (5-2) of the dust removal device (5) is connected to the dust suction pipeline interface of the upper sand storage hopper (1), and the other end is connected to the dust collector (8) through the main dust removal pipeline (7) in sequence to collect the scattered dust in the upper sand storage hopper (1).

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