A sealing arrangement for a screening apparatus

Abstract

The application relates to a sealing structure of a screening device, in particular to a sealing of a metal 3D printing metal powder recycling and screening device, and a sealing structure of a screening device, which comprises a sieve bin upper cover and a sieve bin main body, the sieve bin upper cover is provided with an upper limiting structure, the sieve bin main body is provided with a lower limiting structure, the upper limiting structure and the lower limiting structure are matched with each other to form a sealing cavity, and a sealing element is arranged in the sealing cavity. Through the sealing structure, metal powder of a metal screening and recycling device can be collected and screened and impurities can be removed in a sealed manner; the sealing effect of the metal powder during the screening process is guaranteed, oxygen cannot enter, or inert gas cannot overflow, and the risk of oxidation and explosion of the metal powder caused by the increase of the oxygen content in the screening device is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to a sealing structure, in particular to a sealing structure of a metal 3D printing metal powder recycling and screening device. BACKGROUND

[0002] Metal 3D printing has been widely used in industrial aviation, automobile, medical, scientific research and other fields, metal powder forming can quickly manufacture various models, and has high flexibility and high customization degree. For some complex structure parts, residual powder will be generated during the printing process of metal 3D printing, and the cost of metal printing raw materials is relatively high. If it is not recycled and utilized, it will cause great waste of resources. If recycling and utilization are not proper, the metal powder will be oxidized or even exploded.

[0003] Metal powder in the process of metal 3D printing has strong discreteness, and the particle size range required by 3D printing process for metal powder material is very narrow. The metal powder prepared by gas atomization is a continuous normal distribution of particle size interval. The metal powder is screened out by vibration in the inside of the screening bin. However, in the process of vibration, the particles of the metal powder will rub and collide with each other. If the oxygen content in the screening equipment is too high, the metal powder will be oxidized and exploded. Generally, the metal powder screening in the metal powder recycling equipment is carried out in an inert gas protection environment. Therefore, the sealing performance requirement of all metal powder recycling equipment is relatively high, especially the sealing performance of the screening bin part. If the sealing effect is not good, oxygen in the air enters or inert gas overflows, which will cause the metal powder to be oxidized and have the risk of explosion. SUMMARY

[0004] Therefore, the purpose of the present application is to solve the problems that the metal powder is easy to oxidize and explode when the sealing of the screening equipment is poor during the metal powder recycling process. A sealing structure of a dust-free conveying and screening device is provided to realize closed collection and closed screening and impurity removal of metal powder. The sealing effect of the metal powder during the screening process is ensured to prevent oxygen from entering or inert gas from overflowing, and the risk of oxidation and explosion of the metal powder caused by the increase of oxygen content in the inside of the screening equipment.

[0005] To achieve the above purpose, the following technical solutions are adopted in the present application:

[0006] A sealing structure of a screening device, comprising a screening bin upper cover and a screening bin main body, wherein an upper limiting structure is arranged on the screening bin upper cover, a lower limiting structure is arranged on the screening bin main body, the upper limiting structure and the lower limiting structure are connected with each other in a matched mode, and a sealing element is arranged at the connection position of the upper limiting structure and the lower limiting structure.

[0007] In one of the embodiments, the upper limiting structure and the lower limiting structure respectively comprise wedge structures, the wedge structures are arranged on the upper cover of the sieve bin and the sieve bin body respectively, and the wedge structure of the upper cover of the sieve bin and the wedge structure on the sieve bin body are clamped.

[0008] In one of the embodiments, the wedge structure on the sieve bin body is provided with an elastic member; the elastic member is sealingly connected with the wedge structure of the upper cover of the sieve bin.

[0009] In one of the embodiments, the end of the elastic member is hemispherical.

[0010] In one of the embodiments, the upper limiting structure further comprises a rectangular annular groove, the rectangular annular groove is arranged on the side wall of the upper cover of the sieve bin, and abuts against the side surface of the sieve bin body.

[0011] In one of the embodiments, a rectangular annular sealing member is arranged in the rectangular annular groove, and the rectangular annular sealing member is sealingly connected with the side surface of the sieve bin body.

[0012] In one of the embodiments, the upper limiting structure further comprises an inverted isosceles trapezoidal boss, a spherical annular groove is correspondingly arranged on the lower limiting structure, and the inverted isosceles trapezoidal boss is connected with the spherical annular groove.

[0013] In one of the embodiments, a circular arc sealing member is arranged on the spherical annular groove, and the inverted isosceles trapezoidal boss is sealingly connected with the circular arc sealing member.

[0014] In one of the embodiments, the upper limiting structure further comprises a right trapezoidal boss, and the lower limiting structure further comprises a bin body right trapezoidal groove, the right trapezoidal boss abuts against the bin body right trapezoidal groove.

[0015] In one of the embodiments, a plurality of elbow clamps are arranged on the upper cover of the sieve bin and the sieve bin body, and the elbow clamps press the upper cover of the sieve bin to the sieve bin body.

[0016] The present application has the following beneficial effects:

[0017] The present application provides a sealing structure of an interface and sealing members of different specifications and shapes for overall sealing effect by designing a bin body sealing structure of a screening device, and by triple sealing between an upper cover and a body, between a side wall of the upper cover and the body, and between the bin body and an end of the upper cover. The sealing structure of the present application realizes closed collection and closed screening and impurity removal of metal powder of a metal screening and recycling device, guarantees the sealing effect of the metal powder in the screening process, prevents oxygen from entering or inert gas from overflowing, and prevents the risk of oxidation and explosion of the metal powder caused by the increase of oxygen content in the screening device. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Figure 1 is a perspective view of the metal powder screening device of the present application

[0019] Figure 2 Figure 2 is a sectional view of the upper cover of the screening bin

[0020] Figure 3 Figure 3 is an enlarged view of the upper cover A of the screening bin

[0021] Figure 4 Figure 4 is a schematic view of the rectangular annular sealing strip provided on the side wall of the upper cover of the screening bin

[0022] Figure 5 Figure 5 is a sectional view of the main body of the screening bin

[0023] Figure 6 Figure 6 is an enlarged view of the main body B of the screening bin

[0024] Figure 7 Figure 7 is a schematic view of the circular arc sealing strip provided on the main body of the screening bin

[0025] Figure 8 Figure 8 is an enlarged schematic view of the sealing structure after the upper cover of the screening bin and the main body of the screening bin are joined

[0026] Upper cover of the screening bin - 100, main body of the screening bin - 200, elbow clamp - 300, rectangular annular groove - 110, rectangular annular sealing strip - 111, right-angled trapezoidal boss - 120, inverted isosceles trapezoidal boss - 130, rubber processing piece - 210, bin body right-angled trapezoidal groove - 220, spherical annular groove - 230, circular arc sealing strip - 231 DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] The present application discloses a sealing structure of a metal powder screening device, which comprises an upper cover 100 of a screening bin and a main body 200 of the screening bin. In order to ensure the sealing effect of the upper cover of the screening bin and the main body of the screening bin, the present application provides a sealing structure, which comprises corresponding limiting structures provided on the upper cover 100 of the screening bin and the main body 200 of the screening bin. The limiting structures can form a sealing cavity therebetween, and a sealing element is placed in the sealing cavity. The effective sealing of the screening device is realized through the cooperation of the limiting structures and the sealing element.

[0029] Specifically, in combination with Figure 2 and Figure 3For example, the left end of the upper cover 100 is provided with a rectangular annular groove 110 on the left side wall of the upper cover 100, and a wedge structure is arranged at the end. The end of the combination of the upper cover 100 and the main body 200 is provided with a right-angled trapezoidal boss 120 and an inverted isosceles trapezoidal boss 130. Figure 3 As shown in the cross-sectional view, the cross section of the rectangular annular groove 110 is square, the cross section of the right-angled trapezoidal groove is right-angled trapezoidal, and the cross section of the inverted isosceles trapezoidal boss 130 is inverted isosceles trapezoidal.

[0030] Further, in combination with Figure 4 The rectangular annular sealing strip 111 is arranged on the rectangular annular groove 110 of the side wall, and can be extruded on the side of the main body 200, and the side of the main body can be tightly connected with the rectangular annular sealing strip 111 to form a sealing connection.

[0031] Further, in combination with Figure 5 And Figure 6 The main body 200 is also provided with a wedge structure, which corresponds to the wedge structure arranged on the upper cover 100 and can be clamped together. Further, the wedge structure on the main body 200 is provided with a rubber processing part 210, which can be inlaid and bonded on the wedge structure, and the end of the rubber processing part 210 is processed with a hemispherical structure, which can ensure that the two wedge structures are clamped and the rubber processing part 210 is tightly pressed. By tightly pressing the hemispherical rubber processing part 210, the upper and lower wedge structures are clamped and embedded, realizing a sealing connection. At the same time, the main body 200 is processed with a warehouse body right-angled trapezoidal groove 220 and a spherical annular groove 230 at the end of the combination with the upper cover 100.

[0032] Further, in combination with Figure 7 The spherical annular groove 230 is matched with a circular arc sealing strip 231, and the spherical annular groove 230 is a semicircular groove, which can better limit the position of the circular arc sealing strip 231, so as to prevent the circular arc sealing strip from being deviated and affecting the sealing and pressing effect. At the same time, the inverted isosceles trapezoidal boss 130 trapezoidal groove corresponding to the spherical annular groove can also limit and avoid the position deviation of the circular arc sealing strip 231, prevent the sealing strip from moving during sealing and pressing, and realize the optimal performance of the sealing effect.

[0033] Further, the right-angled trapezoidal boss 120 provided on the sieve bin upper cover 100 can abut against the bin body right-angled trapezoidal groove 220, so as to ensure better positioning, limiting and fixing effects when the upper part and the lower part are combined. In order to further ensure the sealing effect, a sealing member or a rubber member can also be provided in the bin body right-angled trapezoidal groove 220. At this time, the sealing strip inside the right-angled groove on the bin body can be fully pressed by the right-angled trapezoidal boss 120, so as to achieve the effect of compacting and tightly sealing.

[0034] Specifically, in combination with Figure 8 , the overall sealing structure of the screening device is, Figure 8 The figure is a view of the joint sealing of the right end of the sieve bin upper cover 100 and the sieve bin body 200 of the screening device. From the outermost right end, a rectangular circular ring groove 110 is processed on the side wall of the sieve bin upper cover 100, and a rectangular circular ring sealing strip 111 is embedded and bonded in the rectangular circular ring groove 110. When the rectangular circular ring sealing strip 111 is pressed against the side of the sieve bin body 200, the rectangular circular ring sealing strip 111 can be well compacted, realizing sealing after contact, so as to form the first sealing structure. Further, the wedge structure provided on the sieve bin upper cover 100 and the wedge structure on the sieve bin body 200 are clamped together. The bottom of the wedge structure on the sieve bin body 200 is embedded and connected with a rubber processing member 210, and the end hemispherical structure rubber processing member 210 can be fully pressed by the wedge structure on the sieve bin upper cover 100, and the upper and lower wedge structures are also better clamped together, so as to form the second sealing structure. Further, the right-angled trapezoidal boss 120 is provided on the sieve bin upper cover 100, and the bin body right-angled trapezoidal groove 220 is provided on the sieve bin body 200, which are matched with each other to further limit and fix.

[0035] Further, the sieve bin body 200 is processed with a spherical circular ring groove 230, and a reverse isosceles trapezoidal boss 130 is provided on the sieve bin upper cover 100. The spherical circular ring groove 230 is embedded and connected with a circular arc sealing strip 231, and the reverse isosceles trapezoidal boss 130 matched with the circular arc sealing strip 231 is tightly sealed. The reverse isosceles trapezoidal boss 130 can play a limiting and fixing role, effectively limiting the position deviation of the circular arc sealing strip 231. At the same time, the spherical circular ring groove 230 fixes the position of the circular arc sealing strip 231, preventing deviation during the process of tightly sealing. The overall position of the sealing member after being compacted is ensured not to move, realizing effective sealing, so as to form the third sealing structure.

[0036] Further, the sieve bin upper cover 100 and the sieve bin main body 200 are provided with a plurality of sets of elbow clamps 300, and after the sieve bin upper cover 100 and the sieve bin main body 200 are combined, the elbow clamps 300 can compact and tightly cover the sieve bin upper cover 100. The overall triple sealing structure effectively guarantees that the inert gas leaks and the external air enters when the metal powder is screened in the screening equipment, and prevents the risk of oxidation and explosion of the metal powder in the process of vibrating screening.

[0037] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A sealing structure of a screening device, comprising a screen upper cover and a screen main body, characterized in that, an upper limiting structure is arranged on the screen upper cover, and a lower limiting structure is arranged on the screen main body; the upper limiting structure and the lower limiting structure are connected to each other in cooperation, and a sealing element is arranged at the connection of the upper limiting structure and the lower limiting structure; the upper limiting structure and the lower limiting structure each comprise a wedge structure, the wedge structure is arranged on the screen upper cover and the screen main body respectively, and the wedge structure on the screen upper cover and the wedge structure on the screen main body are clamped to each other; an elastic element is arranged on the wedge structure on the screen main body, and the elastic element is sealingly connected to the wedge structure on the screen upper cover; the upper limiting structure further comprises a rectangular annular groove, the rectangular annular groove is arranged on the side wall of the screen upper cover and abuts against the side surface of the screen main body, a rectangular annular sealing element is arranged in the rectangular annular groove, and the rectangular annular sealing element is sealingly connected to the side surface of the screen main body; the upper limiting structure further comprises an inverted isosceles trapezoidal boss, a spherical annular groove is arranged correspondingly on the lower limiting structure, the inverted isosceles trapezoidal boss is connected to the spherical annular groove, a circular arc sealing element is arranged on the spherical annular groove, and the inverted isosceles trapezoidal boss is sealingly connected to the circular arc sealing element.

2. A seal arrangement for a screening apparatus according to claim 1, characterised in that, The end of the elastic element is in a hemispherical shape.

3. The seal arrangement for a screening apparatus of claim 1, wherein, The upper limiting structure further comprises a right-angled trapezoidal boss, and the screen main body correspondingly comprises a bin body right-angled trapezoidal groove, the right-angled trapezoidal boss abuts against the bin body right-angled trapezoidal groove.

4. The seal arrangement for a screening apparatus of claim 1, wherein, A plurality of elbow clamps are arranged on the screen upper cover and the screen main body, and the elbow clamps press the screen upper cover against the screen main body.

Images