Feeding device and packaging machine

Abstract

The utility model discloses a feeding device and a packaging machine, the feeding device comprises a conveying assembly, and the conveying assembly comprises a conveying pipe, a rotating shaft and a spiral blade. The conveying pipe comprises a first section and an inner pipe which are communicated, and the inner diameter of the inner pipe is smaller than that of the first section. The rotating shaft at least partially penetrates through the first section and at least partially penetrates through the inner pipe. The spiral blade is arranged on the rotating shaft and comprises a first fixed-distance part and a second fixed-distance part, the first fixed-distance part is located in the first subsection, the second fixed-distance part is located in the inner pipe, and the screw pitch H2 of the second fixed-distance part is larger than the screw pitch H1 of the first fixed-distance part, so that the conveying capacity of the first fixed-distance part and the conveying capacity of the second fixed-distance part in unit time are equal. According to the utility model, by adjusting the screw pitch and the diameter of the spiral blade, the conveying capacity of each area in the conveying pipe is basically kept consistent.

Description

Technical Field

[0001] The utility model belongs to the technical field of material conveying, and particularly relates to a feeding device and a packaging machine. Background Art

[0002] At present, in industries such as chemical engineering, new energy, food, and medicine, it is necessary to use a packaging machine to package products. Especially for powder materials, due to the special physical properties thereof, the packaging process is more complex and the packaging quality requirements are higher.

[0003] When the existing packaging machine packages powder materials, generally, the bag mouth of the packaging bag is opened through a bag clamping assembly, and then the powder materials in the feeding bin are conveyed into the packaging bag through a feeding device. During the process of the feeding device conveying the powder materials, it is necessary to perform treatments such as degassing and material locking on the powder materials, and it is necessary to sleeved an additional pipe in the conveying pipe to intercept the powder materials to prevent the materials from being sucked away by the negative pressure generated by the degassing assembly or the material locking device. However, the inner pipe will occupy the space of the conveying pipe, change the size of the spiral blade in the conveying pipe, resulting in inconsistent conveying amounts at various parts in the conveying pipe. Especially in the area near the end of the inner pipe, the available conveying space in the conveying pipe suddenly changes, resulting in an obvious difference in the conveying amount in this area from that in other areas. The inconsistent conveying amount will cause the feeding device to be blocked, and the packaging machine cannot accurately control the material conveying amount, making it difficult to keep the volume of the packaged materials consistent each time.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a feeding device, which is used to solve the problems that when the existing packaging machine packages powder materials, due to inconsistent conveying amounts at various parts in the conveying pipe, the feeding device is blocked, the packaging accuracy of the packaging machine is low, and it is difficult to ensure that the volume of the packaged materials is consistent.

[0006] To achieve the above purpose, a specific embodiment of the present utility model provides a feeding device, including a conveying assembly. The conveying assembly includes a conveying pipe, a rotating shaft, and a spiral blade. The conveying pipe includes a first section and an inner pipe that are connected and communicate with each other. The inner diameter of the inner pipe is smaller than the inner diameter of the first section. The rotating shaft penetrates at least partially through the first section and at least partially through the inner pipe. The spiral blade is arranged on the rotating shaft. The spiral blade includes a first constant pitch part and a second constant pitch part. The first constant pitch part is located in the first section, and the second constant pitch part is located in the inner pipe. The pitch H2 of the second constant pitch part is greater than the pitch H1 of the first constant pitch part, so that the conveying amounts of the first constant pitch part and the second constant pitch part per unit time are equal.

[0007] In one or more embodiments of the present utility model, the rotating shaft includes a first shaft portion and a second shaft portion. The diameter of the first shaft portion is greater than that of the second shaft portion. A first spacing portion is provided on the first shaft portion, and a second spacing portion is provided on the second shaft portion.

[0008] In one or more embodiments of the present utility model, the rotating shaft further includes a third shaft portion connected between the first shaft portion and the second shaft portion. The diameter of the third shaft portion gradually decreases along the direction from the first shaft portion to the second shaft portion, and the diameter range of the third shaft portion is between the diameters of the first shaft portion and the second shaft portion.

[0009] In one or more embodiments of the present utility model, the spiral blade further includes a variable pitch portion connected between the first spacing portion and the second spacing portion. The variable pitch portion is located on the third shaft portion, and the pitch H3 of the variable pitch portion increases sequentially along the direction from the first shaft portion to the second shaft portion.

[0010] In one or more embodiments of the present utility model, the blade width of the first spacing portion is equal to that of the second spacing portion.

[0011] In one or more embodiments of the present utility model, the conveying pipe further includes a second segment located below the first segment, and the inner pipe is sleeved inside the second segment.

[0012] In one or more embodiments of the present utility model, a degassing channel is provided between the inner wall of the second segment and the outer wall of the inner pipe.

[0013] In one or more embodiments of the present utility model, the feeding device further includes a degassing assembly, and the degassing assembly is communicated with the degassing channel.

[0014] In one or more embodiments of the present utility model, the outer diameter of the second spacing portion is smaller than that of the first spacing portion.

[0015] In one or more embodiments of the present utility model, the feeding device further includes a bag clamping assembly. The bag clamping assembly is arranged outside the end of the conveying pipe. The bag clamping assembly can move along the axis of the conveying pipe, and the bag clamping assembly is used to open the packaging bag.

[0016] On the other hand, the present utility model also provides a packaging machine, and the packaging machine includes the above-mentioned feeding device.

[0017] Compared with the prior art, the feeding device provided by the present utility model increases the pitch of the second spacing portion in the inner pipe and makes it greater than the pitch of the first spacing portion outside the inner pipe, so that the conveying amounts of the first spacing portion and the second spacing portion per unit time are equal, ensuring that the conveying amounts of each part of the spiral blade per unit time are equal, thereby preventing material accumulation and blockage in the conveying pipe and providing higher packaging accuracy for the packaging machine. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a sectional structure diagram of the feeding device in the first embodiment of the present invention;

[0020] Figure 2 It is a partial sectional structure diagram of the feeding device in the first embodiment of the present invention;

[0021] Figure 3 It is a planar structure diagram of the feeding device in the first embodiment of the present invention applied to a packaging machine.

[0022] Main reference numerals description: 1. Conveying assembly, 11. Conveying pipe, 111. First section, 112. Second section, 12. Inner pipe, 13. Rotating shaft, 131. First shaft part, 132. Third shaft part, 133. Second shaft part, 14. Spiral blade, 141. First fixed-distance part, 142. Second fixed-distance part, 143. Variable-distance part, 15. Degassing channel, 2. Bag clamping assembly, 3. Degassing assembly. Detailed implementation manners

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "vertical", "horizontal", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0025] Embodiment 1:

[0026] Refer to Figure 1 and Figure 2As shown in the figure, this embodiment provides a feeding device, which includes a conveying assembly 1. The conveying assembly 1 includes a conveying pipe 11, a rotating shaft 13 and a spiral blade 14. The conveying pipe 11 includes a first segment 111 and an inner pipe 12 that are connected and communicate with each other. The inner diameter of the inner pipe 12 is smaller than the inner diameter of the first segment 111. The rotating shaft 13 is at least partially disposed in the first segment 111 and at least partially disposed in the inner pipe 12. The spiral blade 14 is disposed on the rotating shaft 13. The spiral blade 14 includes a first constant pitch portion 141 and a second constant pitch portion 142. The first constant pitch portion 141 is located in the first segment 111, and the second constant pitch portion 142 is located in the inner pipe 12. The pitch H2 of the second constant pitch portion 142 is greater than the pitch H1 of the first constant pitch portion 141.

[0027] After the inner pipe 12 is arranged in the second segment 112, the conveying space in the second segment 112 will be reduced. When the blade width remains basically unchanged (in the plane perpendicular to the rotating shaft 13, the distance between the outer ring and the inner ring of the vertical projection of the spiral blade 14 is the blade width), if the pitch H2 of the second constant pitch portion 142 in the inner pipe 12 still remains the same as the pitch H1 of the first constant pitch portion 141, it will result in the conveying amount per unit time of the second constant pitch portion 142 being less than the conveying amount per unit time of the first constant pitch portion 141.

[0028] Therefore, according to the structural design of this embodiment, under the condition that the blade widths of the first constant pitch portion 141 and the second constant pitch portion 142 are basically the same, the pitch H2 of the second constant pitch portion 142 is increased so that its pitch is greater than the pitch H1 of the first constant pitch portion 141, so that the conveying amounts of the first constant pitch portion 141 and the second constant pitch portion 142 per unit time are equal.

[0029] The feeding device in this embodiment is further introduced below.

[0030] The conveying amount (also known as "conveying capacity") of the first constant pitch portion 141 and the second constant pitch portion 142 per unit time is positively correlated with their pitches and blade widths.

[0031] Refer to Figure 2 As shown in the figure, after the inner pipe 12 is arranged, the outer diameter of the second constant pitch portion 142 is relatively smaller than the outer diameter of the first constant pitch portion 141. Therefore, in order to appropriately reduce the inner diameter of the second constant pitch portion 142 and ensure that the blade widths of the first constant pitch portion 141 and the second constant pitch portion 142 are basically the same, the rotating shaft 13 in this embodiment includes a first shaft portion 131 and a second shaft portion 132. The diameter of the first shaft portion 131 is greater than the diameter of the second shaft portion 132. The first constant pitch portion 141 is disposed on the first shaft portion 131, and the second constant pitch portion 142 is disposed on the second shaft portion 132.

[0032] Furthermore, considering that there will be a sudden change in diameter at the connection between the first shaft portion 131 and the second shaft portion 132, it is impossible to accurately control the conveying amount at the connection between the two.

[0033] To solve the above problems, referring to Figure 2 As shown, the rotating shaft 13 in this embodiment further includes a third shaft portion 133 connected between the first shaft portion 131 and the second shaft portion 132. The diameter of the third shaft portion 133 gradually decreases along the direction from the first shaft portion 131 to the second shaft portion 132, and the diameter range of the third shaft portion 133 is between the diameters of the first shaft portion 131 and the second shaft portion 132. The spiral blade 14 further includes a variable pitch portion 143 connected between the first fixed pitch portion 141 and the second fixed pitch portion 142. The variable pitch portion 143 is located on the third shaft portion 133, and the pitch H3 of the variable pitch portion 143 gradually increases along the direction from the first shaft portion 131 to the second shaft portion 132.

[0034] Since the diameter of the third shaft portion 133 substantially changes gradually within the diameter ranges of the first shaft portion 131 and the second shaft portion 132, and the pitch H3 of the variable pitch portion 143 also changes correspondingly, when transitioning from the first fixed pitch portion 141 to the second fixed pitch portion 142, there will be no sudden change in pitch on the premise of maintaining an equal conveying volume per unit time.

[0035] It should be noted that along the direction from the first shaft portion 131 to the second shaft portion 132, the diameter of the third shaft portion 133 can be a smooth continuous gradient or a stepped gradient. It can be understood that the more the number of steps of the stepped gradient of the third shaft portion 133, the closer it can approximate a smooth continuous gradient. In this application, the third shaft portion 133 with different gradient methods can be set according to actual processing needs.

[0036] Referring to Figure 1 and Figure 2 As shown, the conveying pipe 11 in this embodiment further includes a second segment 112 located below the first segment 111, and the inner pipe 12 is sleeved inside the second segment 112.

[0037] Preferably, the inner diameters of the first segment 111 and the second segment 112 are basically the same.

[0038] Referring to Figure 1 and Figure 2 As shown, there is a gap between the inner wall of the conveying pipe 11 and the outer wall of the inner pipe 12 in this embodiment, and this gap forms a degassing channel 15. The degassing channel 15 is used to communicate with the degassing assembly 3 to form a negative pressure inside the degassing channel 15.

[0039] The degassing assembly 3 includes a negative pressure pump and a negative pressure pipeline, where the negative pressure pipeline is respectively connected to the negative pressure pump and the degassing channel 15. Of course, the negative pressure pump can also be replaced by other negative pressure devices.

[0040] Referring to Figure 2 As shown, the outer diameter of the second fixed pitch portion 142 in this embodiment is smaller than the outer diameter of the first fixed pitch portion 141.

[0041] The feeding device in this embodiment further includes a bag clamping assembly 2. The bag clamping assembly 2 is arranged outside the end of the conveying pipe 11. The bag clamping assembly 2 can move along the axis of the conveying pipe 11 and is used to expand the packaging bag.

[0042] The bag clamping assembly 2 includes bag clamping arms and a bag clamping cylinder for driving the bag clamping arms. The bag clamping cylinder drives the bag clamping arms to open the bag mouth of the packaging bag from both sides of the packaging bag by stretching. In practical applications, the bag clamping assembly 2 can be connected to a linear moving device, and the linear moving device is used to drive the bag clamping assembly 2 to move along the axis of the conveying pipe 11, so as to change the distance between the bottom of the packaging bag and the end of the conveying pipe 11, so as to realize bottom feeding.

[0043] Embodiment 2:

[0044] This embodiment provides a packaging machine, which includes the feeding device in Embodiment 1.

[0045] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0046] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A feeding device, comprising a conveying assembly (1), characterized in that, The conveying assembly (1) comprises: A delivery pipe (11), comprising a first segment (111) and an inner pipe (12) which are connected to each other, wherein the inner diameter of the inner pipe (12) is smaller than the inner diameter of the first segment (111); A rotating shaft (13) is at least partially disposed through the first section (111) and at least partially disposed through the inner tube (12); A spiral blade (14) is disposed on the rotating shaft (13), the spiral blade (14) comprising a first distance portion (141) located in the first segment (111) and a second distance portion (142) located in the inner tube (12), the pitch H2 of the second distance portion (142) being greater than the pitch H1 of the first distance portion (141), so that the conveying amounts per unit time of the first distance portion (141) and the second distance portion (142) are equal.

2. The feeding device according to claim 1, wherein The rotating shaft (13) comprises a first shaft portion (131) and a second shaft portion (132); the diameter of the first shaft portion (131) is greater than the diameter of the second shaft portion (132); the first distance portion (141) is arranged on the first shaft portion (131); and the second distance portion (142) is arranged on the second shaft portion (132).

3. The feeding device according to claim 2, characterized in that, The rotating shaft (13) further comprises a third shaft portion (133) connected between the first shaft portion (131) and the second shaft portion (132); the diameter of the third shaft portion (133) gradually decreases along the direction from the first shaft portion (131) to the second shaft portion (132); and the diameter range of the third shaft portion (133) is between the diameters of the first shaft portion (131) and the second shaft portion (132); The spiral blade (14) further comprises a variable pitch portion (143) connected between the first fixed pitch portion (141) and the second fixed pitch portion (142); the variable pitch portion (143) is located on the third shaft portion (133); and a pitch H3 of the variable pitch portion (143) increases sequentially along a direction from the first shaft portion (131) to the second shaft portion (132).

4. The feeding device according to claim 1, characterized in that, The blade width of the first distance portion (141) is equal to the blade width of the second distance portion (142).

5. The feeding device according to claim 1, characterized in that, The delivery pipe (11) further comprises a second section (112) located below the first section (111), and the inner pipe (12) is sleeved inside the second section (112).

6. The feeding device according to claim 5, characterized in that, A degassing channel (15) is provided between the inner wall of the second segment (112) and the outer wall of the inner tube (12).

7. The feeding device according to claim 6, characterized in that, It also includes a degassing component (3), and the degassing component (3) is connected to the degassing channel (15).

8. The feeding device according to claim 1, characterized in that, The outer diameter of the second distance portion (142) is smaller than the outer diameter of the first distance portion (141).

9. The feeding device according to claim 1, characterized in that It also comprises a bag clamping assembly (2), which is arranged on the outside of the end of the conveying tube (11), and the bag clamping assembly (2) can move along the axis of the conveying tube (11), and is used to open the packaging bag.

10. A packaging machine, characterized in that, Comprising the feeding device according to any one of claims 1 to 9.

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