Dry powder small material feeding device

Abstract

The utility model relates to the technical field of dry powder feeding, in particular to a small dry powder feeding device which comprises a mounting ring capable of being placed at an opening of a stirring kettle, the mounting ring is provided with a feeding hole, and a grid mesh assembly is arranged in the feeding hole; the grid mesh assembly can move in the feeding hole in the axial direction and / or the circumferential direction of the feeding hole. The grid mesh assembly can screen the dry powder raw materials, the caked dry powder raw materials are prevented from falling into the stirring kettle, and meanwhile, the dry powder raw materials can be dispersed by the grid mesh assembly, so that the dry powder raw materials can uniformly fall into the stirring kettle. The device can move in the axial direction and / or the circumferential direction of the throwing hole through the grid mesh assembly arranged in the throwing hole. When the grid mesh assembly moves, the caked dry powder raw materials can be impacted; meanwhile, the dry powder raw materials can be fed more uniformly; meanwhile, the grid mesh assembly can generate vibration, so that the dry powder raw materials accumulated on the grid mesh assembly can fall into the stirring kettle, and accumulation of the dry powder raw materials on the grid mesh assembly is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of dry powder feeding, in particular to a dry powder small material feeding device. Background Art

[0002] In the process of coating production, various types of dry powder raw materials are often needed. The dry powder raw materials are stored in storage tanks. When they are needed, the storage tanks are generally tilted and inverted so that the dry powder raw materials can be put into the mixing tank for processing.

[0003] However, the dry powder raw materials stored in the storage tank are prone to agglomeration in some cases, which is not convenient for processing and use. In addition, when feeding, the dry powder raw materials thrown out from the storage tank are not dispersed enough, resulting in poor subsequent processing of the dry powder raw materials. Utility Model Content

[0004] In view of the above problems existing in the prior art, the utility model provides a dry powder small material delivery device.

[0005] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0006] A dry powder small material delivery device, comprising a mounting ring that can be placed at the opening of a stirring kettle, the mounting ring having a delivery hole, and a grid assembly is arranged in the delivery hole;

[0007] The grid assembly can move in the delivery hole along the axial direction and / or circumferential direction of the delivery hole.

[0008] Preferably, the mounting ring comprises a first connecting ring and a second connecting ring respectively located on two sides of the grid assembly;

[0009] A placement groove is provided on one of the side walls of the first connecting ring along the axial direction thereof, the placement groove opens on the inner ring side wall of the first connecting ring, and the grid assembly is placed in the placement groove;

[0010] The second connecting ring is covered on the placement groove along the axial direction of the first connecting ring to limit the grid assembly in the placement groove;

[0011] The grid assembly can move in the placement groove along the axial direction and / or circumferential direction of the first connecting ring.

[0012] Preferably, an operation port is provided on the circumferential side wall of the first connecting ring, and the operation port is communicated with the placement groove;

[0013] The grid assembly is provided with an operating handle passing through the operating opening, and the operating handle can reciprocate in the operating opening along the circumferential direction of the first connecting ring.

[0014] Preferably, a plurality of balls are arranged on the circumferential side wall of the placement groove.

[0015] Preferably, in the axial direction of the first connecting ring, the size of the placement groove is larger than the size of the grid assembly, and the size of the operating port is larger than the size of the operating handle.

[0016] Preferably, the placement groove is provided with a first sealing ring on the axial side wall on the first connecting ring; in the assembled state, the first connecting ring and the grid assembly clamp the first sealing ring.

[0017] Preferably, a second sealing ring is provided on the side wall of the second connecting ring facing the placement groove; in the assembled state, the second connecting ring and the grid assembly clamp the second sealing ring.

[0018] Preferably, the grid assembly comprises a carrying ring and a grid body;

[0019] A receiving groove is provided on the side wall of the carrying ring facing the second connecting ring, the receiving groove is open on the inner ring side wall of the carrying ring, and the grid body is placed in the receiving groove;

[0020] In the assembled state, the second connecting ring and the grid body clamp the second sealing ring.

[0021] Preferably, a driving device is provided at the first connecting ring and / or the second connecting ring, and the driving device is used to drive the grid assembly to reciprocate in the placement groove along the axial and / or circumferential direction of the first connecting ring.

[0022] Preferably, a first annular cover is provided on a side of the first connecting ring away from the second connecting ring;

[0023] A second annular cover is provided on a side of the second connecting ring away from the first connecting ring.

[0024] The utility model has at least the following beneficial effects:

[0025] 1. The present application sets a grid assembly at the opening of the stirring kettle so that the dry powder raw materials poured out of the storage tank can be screened by the grid assembly, which can better prevent some agglomerated dry powder raw materials from falling into the stirring kettle. At the same time, the dry powder raw materials poured out from the storage tank can be dispersed by the multiple sieve holes on the grid assembly, so that the dry powder raw materials can fall into the stirring kettle more evenly, which is convenient for the subsequent processing of the dry powder raw materials in the stirring kettle.

[0026] 2. The present application enables the grid assembly disposed in the delivery hole to move along the axial direction and / or circumferential direction of the delivery hole. In the process of the grid assembly moving, the larger agglomerated dry powder raw materials falling on the grid assembly will be impacted, so that the agglomerated dry powder raw materials roll on the grid assembly, and the agglomerated dry powder raw materials can be dispersed through the continuous collision of multiple sieve holes, thereby making the volume of the agglomerated dry powder raw materials continuously reduced until the dry powder raw materials can pass through the sieve holes and fall into the stirring kettle, thereby avoiding the waste of dry powder raw materials; at the same time, in the process of the grid assembly moving, the delivery of dry powder raw materials can be further dispersed, making the delivery of dry powder raw materials more uniform; at the same time, in the process of the grid assembly moving, the grid assembly itself can generate a certain vibration, so that the dry powder raw materials accumulated on the grid assembly during the delivery process can fall into the stirring kettle, thereby avoiding the accumulation of dry powder raw materials on the grid assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It shows the overall schematic diagram of the dry powder small material delivery device in some embodiments of the present application;

[0028] Figure 2 A schematic diagram of assembling the mounting ring and the grid assembly in some embodiments of the present application is shown;

[0029] Figure 3 A schematic diagram showing a grid assembly installed in a placement slot in some embodiments of the present application is shown;

[0030] Figure 4 A schematic diagram showing a bearing ring installed in a placement groove in some embodiments of the present application is shown.

[0031] The parts indicated by the numbers in the accompanying drawings are as follows:

[0032] 100, mounting ring; 101, launching hole; 110, first connecting ring; 111, placement groove; 111a, ball bearing; 111b, first sealing ring; 112, operating port; 113, first cover shell; 120, second connecting ring; 121, second sealing ring; 122, second cover shell; 200, grid assembly; 201, sieve hole; 202, operating handle; 210, carrying ring; 211, receiving groove; 220, grid body. DETAILED DESCRIPTION

[0033] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to explain the utility model but not to limit it.

[0034] like Figure 1-4As shown, this embodiment provides a dry powder small material delivery device, which includes a mounting ring 100 and a screen assembly 200, wherein the mounting ring 100 can be placed on the opening of the mixing tank, and because the mounting ring 100 itself is a ring-shaped structure, the mounting ring 100 itself has a delivery hole 101, and the screen assembly 200 is arranged in the delivery hole 101.

[0035] When the dry powder raw materials in the storage tank need to be added into the mixing kettle, the mounting ring 100 equipped with the grid assembly 200 can be placed on the opening of the mixing kettle so that the delivery hole 101 on the mounting ring 100 is connected to the mixing kettle, so that the grid assembly 200 is at the opening of the mixing kettle, and then the opening of the storage tank is aligned with the delivery hole 101 and tilted and inverted, so that the dry powder raw materials in the storage tank can be poured out, and then the dry powder raw materials can be delivered into the mixing kettle through the grid assembly 200 in the delivery hole 101.

[0036] By setting a grid assembly 200 at the opening of the mixing kettle, the dry powder raw materials poured out from the storage tank can be screened by the grid assembly 200, which can better prevent some agglomerated dry powder raw materials from falling into the mixing kettle. At the same time, the dry powder raw materials poured out from the storage tank can be dispersed by the multiple sieve holes 201 on the grid assembly 200, so that the dry powder raw materials can fall into the mixing kettle more evenly, which is convenient for the subsequent processing of the dry powder raw materials in the mixing kettle.

[0037] Furthermore, the grid assembly 200 disposed in the delivery hole 101 can move along the axial direction and / or the circumferential direction of the delivery hole 101 . When the grid assembly 200 is able to move along the circumferential direction of the delivery hole 101, the larger agglomerated dry powder raw materials falling on the grid assembly 200 will be impacted during the movement of the grid assembly 200, so that the agglomerated dry powder raw materials roll on the grid assembly 200, and the agglomerated dry powder raw materials can be dispersed through the continuous collision of multiple sieve holes 201, so that the volume of the agglomerated dry powder raw materials can be continuously reduced until the dry powder raw materials can pass through the sieve holes 201 and fall into the mixing kettle, thereby avoiding the waste of dry powder raw materials; at the same time, during the movement of the grid assembly 200, the delivery of dry powder raw materials can be further dispersed, so that the delivery of dry powder raw materials is more uniform; at the same time, during the movement of the grid assembly 200, the grid assembly 200 itself can generate a certain vibration, so that the dry powder raw materials accumulated on the grid assembly 200 during the delivery process can fall into the mixing kettle, thereby avoiding the accumulation of dry powder raw materials on the grid assembly 200. When the grid assembly 200 is able to move along the axial direction of the delivery hole 101, it is also able to collide with the larger agglomerated dry powder raw materials that fall on the grid assembly 200, so that the agglomerated dry powder raw materials roll on the grid assembly 200, and the agglomerated dry powder raw materials can be dispersed through the continuous collision of the multiple sieve holes 201, so that the volume of the agglomerated dry powder raw materials can be continuously reduced until the dry powder raw materials can pass through the sieve holes 201 and fall into the mixing kettle, thereby avoiding the waste of dry powder raw materials; at the same time, in the process of the movement of the grid assembly 200, the delivery of the dry powder raw materials can be further dispersed, so that the delivery of the dry powder raw materials is more uniform; at the same time, in the process of the movement of the grid assembly 200, the grid assembly 200 itself can generate a certain vibration, so that the dry powder raw materials accumulated on the grid assembly 200 during the delivery process can fall into the mixing kettle, thereby avoiding the accumulation of dry powder raw materials on the grid assembly 200.

[0038] In some embodiments, the mounting ring 100 includes a first connecting ring 110 and a second connecting ring 120, wherein the first connecting ring 110 and the second connecting ring 120 are respectively located on both sides of the grid assembly 200. A placement groove 111 is provided on one of the side walls in the axial direction of the first connecting ring 110, and the placement groove 111 opens on the inner ring side wall of the first connecting ring 110, that is, the placement groove 111 opens on the side wall of the delivery hole 101.

[0039] During the specific installation, the grid assembly 200 is placed in the placement groove 111, and then the second connecting ring 120 is covered on the placement groove 111 along the axial direction of the first connecting ring 110, so that the second connecting ring 120 can cover the placement groove 111, so that the second connecting ring 120 can limit the grid assembly 200, and the grid assembly 200 is limited in the placement groove 111 to complete the assembly.

[0040] It can be understood that the inner ring of the first connecting ring 110 and the inner ring of the second connecting ring 120 form a delivery hole 101 in the assembled state. From the above, it can be known that the first connecting ring 110 and the second connecting ring 120 form a clamping effect on the grid assembly 200. Therefore, the grid assembly 200 can be set in the delivery hole 101 for use, so that when the dry powder raw material is delivered to the delivery hole 101, the dry powder raw material can be screened and dispersed through the grid assembly 200.

[0041] Furthermore, after the second connecting ring 120 is covered on the placement groove 111, so that the grid assembly 200 is limited in the placement groove 111, the grid assembly 200 can reciprocate in the placement groove 111 along the axial direction and / or circumferential direction of the first connecting ring 110, thereby realizing the dispersion of the dry powder raw materials and the processing of agglomerated dry powder raw materials by the grid assembly 200, which is convenient for use.

[0042] Furthermore, the first connecting ring 110 and the second connecting ring 120 can be assembled by bolt connection, clamping connection or adhesive connection, so that the first connecting ring 110 and the second connecting ring 120 are detachably connected, and the grid assembly 200 in the placement groove 111 can be replaced or repaired, which is easy to use and highly flexible.

[0043] In some embodiments, an operation opening 112 is provided on the circumferential outer side wall of the first connecting ring 110, and the operation opening 112 extends along the circumferential direction of the first connecting ring 110 and communicates with the placement groove 111. An operation handle 202 extending through the operation opening 112 to the circumferential outer side of the first connecting ring 110 is provided on the grid assembly 200, and the operation handle 202 can reciprocate in the operation opening 112 along the extension direction of the operation opening 112.

[0044] It is understandable that the operating handle 202 in the operating port 112 is connected to the grid assembly 200. When the operating handle 202 moves in the operating port 112 along the extension direction of the operating port 112, the operating handle 202 can drive the grid assembly 200 in the placement slot 111 to move along the circumferential direction of the first connecting ring 110, thereby enabling the grid assembly 200 to screen and disperse the dry powder raw materials. In actual use, the staff can observe the situation in the delivery hole 101 and move the operating handle 202 manually or electrically, thereby driving the grid assembly 200 to move, which is convenient for use.

[0045] It should be noted that in order to facilitate the driving of the grid assembly 200 through the operating handle 202, a plurality of operating ports 112 can be set on the first connecting ring 110, and a plurality of operating handles 202 corresponding to the operating ports 112 can be set on the grid assembly 200, thereby facilitating the use of the staff and improving the flexibility and efficiency of driving the grid assembly 200.

[0046] In some embodiments, a plurality of balls 111 a are arranged on the circumferential side wall of the placement groove 111 .

[0047] By providing a plurality of ball bearings 111a in the present embodiment, the sliding friction between the mesh assembly 200 and the circumferential side wall of the placement groove 111 can be converted into rolling friction, thereby effectively reducing the friction resistance between the mesh assembly 200 and the placement groove 111, and thus effectively improving the efficiency of driving the mesh assembly 200 through the operating handle 202, so that a small force applied to the operating handle 202 can drive the mesh assembly 200 to move, thereby facilitating use.

[0048] Of course, in some embodiments, in order to further reduce the friction resistance between the grid assembly 200 and the first connecting ring 110 and the second connecting ring 120, balls 111a may be arranged on the side walls of the placement groove 111 in the axial direction, and balls 111a may be arranged on the side walls of the second connecting ring 120, so that the grid assembly 200 and the first connecting ring 110 and the second connecting ring 120 can achieve rolling friction.

[0049] In some embodiments, along the axial direction of the first connecting ring 110, the size of the placement groove 111 is larger than the size of the grid assembly 200, so that the grid assembly 200 can move in the placement groove 111 along the axial direction of the first connecting ring 110. At the same time, the size of the operating port 112 is larger than the size of the operating handle 202, so that the operating handle 202 can move in the operating port 112 along the axial direction of the first connecting ring 110.

[0050] Specifically, in the process of adding dry powder raw materials into the mixing kettle, the operating handle 202 can be driven so that the operating handle 202 can move in the operating port 112 along the axial direction of the first connecting ring 110, thereby driving the grid assembly 200 to move in the placement groove 111 along the axial direction of the first connecting ring 110, thereby enabling the grid assembly 200 to screen and disperse the dry powder raw materials.

[0051] In some embodiments, a first sealing ring 111b is provided on the side wall of the placement groove 111 in the axial direction of the first connecting ring 110. During assembly, the grid assembly 200 is first placed in the placement groove 111, and then the second connecting ring 120 is covered on the placement groove 111 to complete the assembly. In the assembled state, the axial side wall of the grid assembly 200 away from the second connecting ring 120 can squeeze the first sealing ring 111b, that is, the first connecting ring 110 and the grid assembly 200 clamp the first sealing ring 111b.

[0052] It should be noted that, in the assembled state, the grid assembly 200 is squeezed against the first sealing ring 111b arranged on the placement groove 111, which can better seal the gap between the grid assembly 200 and the placement groove 111, and can prevent the dry powder raw material from entering the placement groove 111, thereby ensuring that the dry powder raw material can smoothly enter the mixing kettle, and also preventing the dry powder raw material from entering the placement groove 111 and affecting the movement of the grid assembly 200.

[0053] Furthermore, the first sealing ring 111b is made of rubber material, so that the first sealing ring 111b can have better elastic performance; when the grid assembly 200 is driven by the operating handle 202 to move along the circumferential direction of the first connecting ring 110, the movement of the grid assembly 200 can cause the first sealing ring 111b to vibrate, thereby removing the dry powder raw material attached to the first sealing ring 111b; when the operating handle 202 is driven to move along the axial direction of the first connecting ring 110 in the operating port 112, the operating handle 202 can drive the grid assembly 200 to squeeze the first sealing ring 111b, and through the compressive deformation of the first sealing ring 111b, the grid assembly 200 follows the operating handle 202 to move along the axial direction of the first connecting ring 110. At the same time, the movement of the grid assembly 200 can also cause the first sealing ring 111b to vibrate, thereby removing the dry powder raw material attached to the first sealing ring 111b.

[0054] It can be understood that, since the first sealing ring 111b has better elastic properties, when the grid assembly 200 moves along the axial and / or circumferential direction of the first connecting ring 110, the first sealing ring 111b can still better maintain the sealing of the gap between the grid assembly 200 and the placement groove 111, thereby preventing the dry powder raw material from entering the placement groove 111.

[0055] In some embodiments, a second sealing ring 121 is provided on the side wall of the second connecting ring 120 facing the placement groove 111, so that in the assembled state, the second connecting ring 120 and the grid assembly 200 can clamp the second sealing ring 121. During assembly, the grid assembly 200 is placed in the placement groove 111, and then the second connecting ring 120 is covered on the placement groove 111, so that the two sides of the grid assembly 200 can respectively squeeze the first sealing ring 111b and the second sealing ring 121, the first sealing ring 111b can seal the gap between the grid assembly 200 and the first connecting ring 110, and the second sealing ring 121 can seal the gap between the grid assembly 200 and the second connecting ring 120. With the cooperation of the first sealing ring 111b and the second sealing ring 121, the placement groove 111 can be better sealed to prevent the entry of dry powder raw materials.

[0056] It is worth mentioning that when the grid assembly 200 moves along the circumferential direction of the first connecting ring 110, the grid assembly 200 can drive the first sealing ring 111b and the second sealing ring 121 to vibrate, thereby cleaning the dry powder raw materials attached to the first sealing ring 111b and the second sealing ring 121; when the grid assembly 200 moves along the axial direction of the first connecting ring 110, it can squeeze the first sealing ring 111b and the second sealing ring 121 to different degrees, so that the first sealing ring 111b and the second sealing ring 121 can still maintain an effective sealing effect. At the same time, it will also cause the first sealing ring 111b and the second sealing ring 121 to vibrate to a certain extent, thereby having a certain cleaning effect on the first sealing ring 111b and the second sealing ring 121.

[0057] In some embodiments, the grid assembly 200 includes a supporting ring 210 and a grid body 220, wherein a receiving groove 211 is opened on a side wall of the supporting ring 210 along its axial direction, and the receiving groove 211 is open on the circumferential inner wall of the supporting ring 210, and the grid body 220 is arranged in the receiving groove 211.

[0058] During the assembly process, the grid body 220 is first placed in the accommodating groove 211, so that the grid body 220 and the supporting ring 210 form a grid assembly 200. Then, the entire grid assembly 200 is placed in the placement groove 111. During this process, the grid body 220 is facing the outside of the placement groove 111, and then the second connecting ring 120 is covered on the placement groove 111 to complete the assembly.

[0059] It should be further explained that, in the present embodiment, the operating handle 202 is directly connected to the supporting ring 210, so that the operating handle 202 drives the supporting ring 210, and the supporting ring 210 drives the mesh body 220 to move along the circumferential and / or axial direction of the first connecting ring 110; in the present embodiment, the supporting ring 210 in the mesh assembly 200 realizes the extrusion of the first sealing ring 111b, and the mesh body 220 in the mesh assembly 200 realizes the extrusion of the second sealing ring 121.

[0060] In particular, by forming the grid assembly 200 with the supporting ring 210 and the grid body 220, after the second connecting ring 120 is disassembled, the grid body 220 in the accommodating groove 211 can be disassembled for replacement or repair, without removing the supporting ring 210 from the placement groove 111 and removing the operating handle 202 from the operating port 112, and the operation is convenient and quick.

[0061] At the same time, the second sealing ring 121 is squeezed by the mesh body 220, and when the second sealing ring 121 is deformed under pressure, it can also apply a certain force to the mesh body 220, so that the mesh body 220 can be better maintained in the receiving groove 211. Of course, in order to enable the carrying ring 210 to better drive the mesh body 220 to move, the mesh body 220 can be installed in the receiving groove 211 in a detachable manner such as interference fit, bolt fit or snap fit, and the second sealing ring 121 can play an auxiliary fixing role for the mesh body 220, so that the state of the mesh body 220 in the receiving groove 211 can be more stable.

[0062] In some embodiments, a driving device (not shown in the figure) is provided at the first connecting ring 110 and / or the second connecting ring 120, through which the grid assembly 200 can be driven to move in the placement groove 111 along the axial and / or circumferential direction of the first connecting ring 110.

[0063] It is understandable that the size of the dry powder small material delivery device in this embodiment varies according to different usage environments. When the size of the overall mechanism is large, it is inconvenient to manually drive the operating handle 202. At this time, the operating handle 202 can be driven by setting the placement of the driving device, thereby realizing the movement of the grid assembly 200 in the placement slot 111, which is convenient for use.

[0064] Furthermore, the driving device may be a driving motor, a cylinder or other equipment, without any particular limitation; further, the driving device may be directly disposed in the operating port 112 so that the driving device can better drive the operating handle 202 .

[0065] In some embodiments, a first annular cover 113 is disposed on a side of the first connecting ring 110 away from the second connecting ring 120 , and a second annular cover 122 is disposed on a side of the second connecting ring 120 away from the first connecting ring 110 .

[0066] It should be noted that the first cover shell 113 can be installed with the first connecting ring 110 by means of one-piece molding, bolt fitting, snap fitting, or thread fitting. Similarly, the second cover shell 122 can be installed with the second connecting ring 120 by means of one-piece molding, bolt fitting, snap fitting, or thread fitting.

[0067] After the dry powder small material delivery device in this embodiment is assembled, when in use, the whole device is covered on the opening of the stirring kettle through the first cover shell 113, and the dry powder raw material in the storage tank is delivered into the second cover shell 122. Through the arrangement of the first cover shell 113 and the second cover shell 122, the leakage of the dry powder raw material during the delivery process can be better avoided, the safety and stability of the delivery process can be improved, and it is easy to use.

[0068] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A dry powder small material delivery device, characterized in that: It comprises a mounting ring which can be placed at the opening of the stirring tank, the mounting ring having a delivery hole, and a grid assembly is arranged in the delivery hole; The grid assembly can move in the delivery hole along the axial direction and / or circumferential direction of the delivery hole; The mounting ring comprises a first connecting ring and a second connecting ring respectively located on two sides of the grid assembly; A placement groove is provided on one of the side walls of the first connecting ring along the axial direction thereof, the placement groove opens on the inner ring side wall of the first connecting ring, and the grid assembly is placed in the placement groove; The second connecting ring is covered on the placement groove along the axial direction of the first connecting ring to limit the grid assembly in the placement groove; The grid assembly can move in the placement groove along the axial direction and / or circumferential direction of the first connecting ring.

2. The dry powder small material delivery device according to claim 1, characterized in that: An operation opening is provided on the circumferential side wall of the first connecting ring, and the operation opening is communicated with the placement groove; The grid assembly is provided with an operating handle passing through the operating opening, and the operating handle can reciprocate in the operating opening along the circumferential direction of the first connecting ring.

3. The dry powder small material delivery device according to claim 2, characterized in that: A plurality of balls are arranged on the circumferential side wall of the placement groove.

4. The dry powder small material delivery device according to claim 2, characterized in that: In the axial direction of the first connecting ring, the size of the placement groove is larger than the size of the grid assembly, and the size of the operating port is larger than the size of the operating handle.

5. The dry powder small material delivery device according to claim 4, characterized in that: The placement groove is provided with a first sealing ring on the axial side wall on the first connecting ring; in the assembled state, the first connecting ring and the grid assembly clamp the first sealing ring.

6. The dry powder small material delivery device according to claim 4, characterized in that: A second sealing ring is provided on the side wall of the second connecting ring facing the placement groove; in the assembled state, the second connecting ring and the grid assembly clamp the second sealing ring.

7. The dry powder small material delivery device according to claim 6, characterized in that: The grid assembly comprises a carrying ring and a grid body; A receiving groove is provided on the side wall of the carrying ring facing the second connecting ring, the receiving groove is open on the inner ring side wall of the carrying ring, and the grid body is placed in the receiving groove; In the assembled state, the second connecting ring and the grid body clamp the second sealing ring.

8. The dry powder small material delivery device according to claim 1, characterized in that: A driving device is provided at the first connecting ring and / or the second connecting ring, and the driving device is used to drive the grid assembly to move back and forth in the placement groove along the axial direction and / or circumferential direction of the first connecting ring.

9. The dry powder small material delivery device according to claim 1, characterized in that: A first annular cover is provided on one side of the first connecting ring away from the second connecting ring; A second annular cover is provided on a side of the second connecting ring away from the first connecting ring.

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