A negative pressure space packaging apparatus and method

Abstract

The present application relates to material packaging technical field, propose a kind of negative pressure space packaging equipment and method, including packaging hopper, encapsulation hopper, circulating hopper, elevator and screw conveyor;One end of the screw conveyor is communicated and disposed below in the packaging hopper, and the other end is disposed at the bottom side of the circulating hopper;The screw conveyor can be bidirectional transport, the conveying direction of the screw conveyor is same with the conveying direction of the elevator, material in the circulating hopper is added to the packaging hopper;When the conveying direction of the screw conveyor is opposite to the conveying direction of the elevator, material is circulated between the packaging hopper and the circulating hopper and transported.The present application is by being capable of bidirectional transport of material screw conveyor, not only can be matched with elevator and be transported to different positions in packaging hopper with material, but also can be matched with elevator and make material circulated between packaging hopper and circulating hopper, to avoid material from hardening problem.

Description

Technical Field

[0001] This invention relates to the field of material packaging technology, and in particular to a negative pressure space packaging device and method. Background Technology

[0002] In the field of material processing, packaging is of paramount importance. Good packaging can not only protect materials from external environmental factors, extend the shelf life of products, and prevent product oxidation and moisture, but also improve the appearance quality and market competitiveness of products.

[0003] When packaging powdered or granular materials, the material in the hopper is prone to clumping. To solve this problem, a material stirring mechanism is installed in the packaging equipment. For example, the hopper and its support structure of a double-headed powder packaging machine disclosed in utility model CN211844963U are equipped with stirring rods or spiral blades in the hopper to agitate the powder, facilitate the downward flow of the powder, and prevent the powder from caking.

[0004] The above-mentioned technical solution can perform simple stirring of materials. However, when there is a large amount of material in the hopper, simple stirring cannot achieve a good anti-caking effect. At the same time, the functions of the packaging machine are not rich enough, resulting in relatively few operating conditions that the device can adapt to, which cannot meet more usage needs and is not conducive to improving the market competitiveness of packaging equipment. Summary of the Invention

[0005] In view of this, the present invention proposes a negative pressure space packaging device and method, which enables materials to circulate between the packaging hopper and the circulation hopper, thereby avoiding the problem of material caking.

[0006] The technical solution of this invention is implemented as follows: On one hand, this invention provides a negative pressure space packaging device, including a packaging hopper, a sealing hopper, a circulating hopper, an elevator, and a screw conveyor. The sealing hopper is fixedly disposed at the lower end of the packaging hopper; the circulating hopper is disposed below one side of the packaging hopper; one end of the elevator is connected to the circulating hopper, and the other end is located above the packaging hopper; one end of the screw conveyor is connected to the lower part of the packaging hopper, and the other end is connected to the bottom side of the circulating hopper; the screw conveyor is capable of bidirectional conveying. When the conveying direction of the screw conveyor is the same as the conveying direction of the elevator, material in the circulating hopper is added to the packaging hopper; when the conveying direction of the screw conveyor is opposite to the conveying direction of the elevator, material is circulated between the packaging hopper and the circulating hopper.

[0007] Based on the above technical solutions, preferably, the screw conveyor includes an outer cylinder, an auger shaft, a sealing plate, and an opening / closing device. The outer cylinder is fixed through and fixed to the packaging hopper. The auger shaft is rotatably disposed inside the outer cylinder. The sealing plate is sealed and fixed to the end of the outer cylinder and located inside the packaging hopper. A material passage hole is formed in the sealing plate. The opening / closing device is disposed on the auger shaft. When the auger shaft rotates, the opening / closing device does not block the material passage hole. When the auger shaft does not rotate, the opening / closing device blocks the material passage hole.

[0008] Based on the above technical solutions, preferably, the opening and closing device includes a fixed box, a sliding rod, a spring, a blocking plate, a first connecting rod, a second connecting rod, and a counterweight. The fixed box is fixedly disposed inside the outer cylinder, and the end of the auger shaft passes through and is rotatably disposed inside the fixed box. The sliding rod is slidably disposed on the auger shaft and is rotatably and slidably connected to the sealing plate. The spring is abutted between the sliding rod and the auger shaft. The blocking plate is fixedly disposed on the sliding rod and blocks the material passage hole. One end of the first connecting rod is rotatably disposed on the sliding rod. One end of the second connecting rod is rotatably disposed on the auger shaft, and the other end of the second connecting rod is rotatably connected to the other end of the first connecting rod. The counterweight is fixedly disposed on the first connecting rod.

[0009] Based on the above technical solutions, preferably, the end of the fixing box near the blocking plate is flat, and when the auger shaft rotates, the counterweight moves away from the slide rod, and the blocking plate abuts against the fixing box.

[0010] Based on the above technical solutions, preferably, the opening and closing device further includes a spiral blade, which is fixedly mounted on the slide rod. When the counterweight is away from the slide rod, the spiral blade abuts against the sealing plate on the side away from the auger shaft.

[0011] Based on the above technical solutions, preferably, the spiral direction of the spiral blade is the same as the spiral direction of the auger shaft.

[0012] Based on the above technical solutions, preferably, the sealing plate has a receiving groove on the side away from the auger shaft, the material passage hole is connected to the receiving groove, and when the spiral blade abuts against the sealing plate, the spiral blade is located in the receiving groove.

[0013] Based on the above technical solutions, preferably, the outer cylinder includes a first cylinder body, a second cylinder body, and an assembly cover. The first cylinder body and the second cylinder body are detachably and fixedly connected. An assembly hole is provided on the periphery of the first cylinder body. The assembly cover is detachably fixed to the first cylinder body and seals the assembly hole. The auger shaft includes a first shaft body and a second shaft body. The first shaft body is rotatably disposed in the first cylinder body. The second shaft body is rotatably disposed in the second cylinder body and the first cylinder body, and is detachably and fixedly connected to the first shaft body. The end of the first shaft body near the second shaft body is located at the assembly hole.

[0014] Based on the above technical solutions, preferably, the packaging hopper includes two metering hoppers, a confluence hopper, a rotating plate, and a telescopic cylinder. The metering hoppers are fixedly disposed at the lower end of the packaging hopper, and the two metering hoppers are arranged side by side. The confluence hopper is fixedly disposed at the lower end of the two metering hoppers. The rotating plate is rotatably disposed on the metering hoppers, and the rotating plate corresponds one-to-one with the metering hoppers. The telescopic cylinder is fixedly disposed on the metering hoppers, and its output end is connected to the rotating plate to drive the rotating plate to seal the metering hoppers.

[0015] Secondly, the present invention provides a negative pressure space packaging method using the aforementioned negative pressure space packaging equipment, comprising the following steps: S1, adding material into the circulating hopper, such that the conveying direction of the screw conveyor is the same as the conveying direction of the elevator, and using the elevator and / or the screw conveyor to convey the material into the packaging hopper; S2, making the conveying direction of the screw conveyor opposite to the conveying direction of the elevator, so that the material is circulated between the packaging hopper and the circulating hopper; S3, installing a packaging bag at the lower end of the sealing hopper, and the material enters the packaging bag through the sealing hopper; S4, vacuuming the inside of the packaging bag and sewing the bag opening.

[0016] The negative pressure space packaging device and method of the present invention have the following advantages over the prior art:

[0017] (1) By setting up a screw conveyor that can transport materials in both directions, it can not only work with the elevator to transport materials to different positions in the packaging hopper, but also work with the elevator to allow materials to circulate between the packaging hopper and the circulating hopper, so as to avoid the problem of material caking.

[0018] (2) By setting up an opening and closing device, when the screw conveyor is not running, the opening and closing device can be used to block the material passage hole, which can prevent the material in the packaging hopper from flowing into the circulation hopper, thus ensuring the normal operation of the material packaging equipment when the screw conveyor stops.

[0019] (3) By setting one end of the fixed box to be flat, the flow of material can be prevented from affecting the position of the blockage plate by the contact between the blockage plate and the flat surface. By setting the spiral blades and making the spiral direction of the spiral blades the same as the spiral direction of the auger shaft, the material conveying efficiency and anti-blocking effect can be improved.

[0020] (4) By setting the packaging hopper to include two quantitative hoppers, a confluence hopper, a rotating plate and a telescopic cylinder, the packaging efficiency of materials can be further improved by utilizing the alternating operation of the telescopic cylinder. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of a negative pressure space packaging device according to the present invention.

[0023] Figure 2 This is a cross-sectional view of a negative pressure space packaging device according to the present invention.

[0024] Figure 3 This is a cross-sectional view of the opening and closing device when the screw conveyor is not in operation in a negative pressure space packaging device of the present invention.

[0025] Figure 4 This is a cross-sectional view of the opening and closing device of the screw conveyor during operation in a negative pressure space packaging device according to the present invention.

[0026] Figure 5 for Figure 4 Enlarged view of the helical blades.

[0027] Figure 6 This is a perspective view of the opening / closing device in a negative pressure space packaging device according to the present invention.

[0028] Figure 7 This is a perspective view of the sealing plate in a negative pressure space packaging device according to the present invention.

[0029] Figure 8 This is an exploded view of the assembly hole in a negative pressure space packaging device according to the present invention.

[0030] Figure 9 This is a perspective view of the sealing hopper in a negative pressure space packaging device according to the present invention.

[0031] Figure 10 This is a cross-sectional view of the transfer plate in a negative pressure space packaging device according to the present invention.

[0032] The components include: 1. Packaging hopper; 2. Sealing hopper; 21. Quantitative hopper; 22. Converging hopper; 23. Rotating plate; 24. Telescopic cylinder; 3. Circulating hopper; 4. Elevator; 5. Screw conveyor; 51. Outer cylinder; 52. Screw shaft; 53. Sealing plate; 54. Opening / closing device; 511. First cylinder; 512. Second cylinder; 513. Assembly cover; 521. First shaft; 522. Second shaft; 541. Fixing box; 542. Slide rod; 543. Spring; 544. Blocking plate; 545. First connecting rod; 546. Second connecting rod; 547. Counterweight; 548. Spiral blade; 501. Material passage hole; 502. Container trough; 503. Assembly hole. Detailed Implementation

[0033] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0034] The present invention provides a negative pressure space packaging device, comprising a packaging hopper 1, a sealing hopper 2, a circulating hopper 3, an elevator 4, and a screw conveyor 5, for packaging powder or granular solid materials and high-viscosity liquid materials.

[0035] like Figure 1 As shown, both the packaging hopper 1 and the circulating hopper 3 are funnel-shaped structures with openings at both the upper and lower ends. The packaging hopper 1 is the main compartment of the packaging equipment, and the circulating hopper 3 is used to store materials that need to be packaged. The circulating hopper 3 is located below one side of the packaging hopper 1. One end of the elevator 4 is connected to the circulating hopper 3, and the other end of the elevator 4 is located above the packaging hopper 1, so that the materials stored in the circulating hopper 3 can be transported to the opening above the packaging hopper 1.

[0036] The sealing hopper 2 is used to control the flow of materials. It is fixedly installed at the lower end of the packaging hopper 1, so that the materials in the sealing hopper 2 flow out intermittently and into the packaging bag installed at the lower end of the sealing hopper 2. In conjunction with the vacuum equipment and the packaging bag sewing equipment, the materials are vacuum packaged.

[0037] One end of the screw conveyor 5 is connected to the lower part of the packaging hopper 1, and the other end of the screw conveyor 5 is connected to the bottom side of the circulation hopper 3. The screw conveyor 5 includes an outer cylinder 51, an auger shaft 52, and a motor. The two ends of the outer cylinder 51 are fixedly installed on the packaging hopper 1 and the circulation hopper 3, respectively. The packaging hopper 1 and the circulation hopper 3 are connected through the outer cylinder 51. The auger shaft 52 is a shaft-shaped structure with spiral auger blades installed. The auger shaft 52 is rotatably installed inside the outer cylinder 51. The motor is fixedly installed on the outer cylinder 51, and the output end of the motor is coaxially fixed with the auger shaft 52. By using the forward and reverse rotation of the motor, the auger shaft 52 can be driven to rotate in both directions, thereby enabling the screw conveyor 5 to have a bidirectional conveying function.

[0038] like Figure 2 As shown, the upper end of the screw conveyor 5 extends into the packaging hopper 1 and is located at the bottom of the packaging hopper 1. In the early stages of material packaging, the elevator 4 can directly convey the material into the packaging hopper 1. In the middle stages of material packaging, if a second material needs to be added to the first material in the packaging hopper 1, the conveying direction of the screw conveyor 5 can be the same as that of the elevator 4. The elevator 4 and screw conveyor 5 can then be used to add the second material to the upper and lower layers of the first material, respectively, to meet different usage requirements.

[0039] When the packaged material is a mixture of various components, the shapes, sizes, and densities of these components differ, making stratification a common problem during packaging. Furthermore, during the use of packaging equipment, materials accumulating in the packaging hopper are prone to clumping due to moisture and compression. For special materials, the packaging process sometimes requires heating or cooling, which can lead to uneven heating or cooling. Circulating the material is the most direct way to solve these problems and improve the consistency of the packaged material quality.

[0040] like Figure 2 As shown, when it is necessary to circulate the material, the conveying direction of the screw conveyor 5 is opposite to that of the elevator 4. That is, the elevator 4 conveys the material in the circulation bucket 3 to the upper part of the packaging bucket 1, and the material in the lower part of the packaging bucket 1 is conveyed to the circulation bucket 3 by the screw conveyor 5, so that the material is circulated between the packaging bucket 1 and the circulation bucket 3.

[0041] In some cases, only the elevator 4 is used to transport materials, without the screw conveyor 5. To prevent materials in the packaging hopper 1 from entering the stopped screw conveyor 5, a sealing plate 53 and an opening / closing device 54 are also provided in the screw conveyor 5. The sealing plate 53 is sealed and fixed to the end of the outer cylinder 51 and located inside the packaging hopper 1. A material passage hole 501 is opened in the sealing plate 53. The opening / closing device 54 is set on the auger shaft 52. When the auger shaft 52 rotates, the opening / closing device 54 does not block the material passage hole 501, allowing the material to enter the outer cylinder 51 through the material passage hole 501 and be transported by the rotating auger shaft 52. When the auger shaft 52 does not rotate, the opening / closing device 54 blocks the material passage hole 501, thereby preventing the material from passing through the material passage hole 501.

[0042] In a preferred embodiment, the opening / closing device 54 includes a fixed box 541, a sliding rod 542, a spring 543, a blocking plate 544, a first connecting rod 545, a second connecting rod 546, and a counterweight 547. The fixed box 541 is fixedly disposed inside the outer cylinder 51. The end of the auger shaft 52 passes through and is rotatably disposed inside the fixed box 541. The sliding rod 542 is slidably disposed on the auger shaft 52 and is rotatably and slidably connected to the sealing plate 53. The spring 543 is abutted between the sliding rod 542 and the auger shaft 52. The blocking plate 544 is fixedly disposed on the sliding rod 542 and blocks the material passage hole 501. One end of the first connecting rod 545 is rotatably disposed on the sliding rod 542. One end of the second connecting rod 546 is rotatably disposed on the auger shaft 52. The other end of the second connecting rod 546 is rotatably connected to the other end of the first connecting rod 545. The counterweight 547 is fixedly disposed on the first connecting rod 545.

[0043] like Figure 3 As shown, when the auger shaft 52 is not rotating, the spring 543 holds the slide bar 542, causing the blocking plate 544 to abut against the sealing plate 53 and block the material passage hole 501, preventing the material in the packaging hopper 1 from passing through the material passage hole 501.

[0044] like Figure 4 As shown, when the auger shaft 52 rotates, whether clockwise or counterclockwise, it drives the first connecting rod 545, the second connecting rod 546, and the counterweight 547 to rotate. During rotation, the counterweight 547 experiences centrifugal force and moves away from the sliding rod 542, causing the first connecting rod 545 and the second connecting rod 546 to rotate accordingly. This causes the sliding rod 542 to move closer to the auger shaft 52, and the spring 543 to contract, thus separating the blocking plate 544 from the sealing plate 53, allowing the material in the packaging hopper 1 to pass through the material passage 501. When the auger shaft 52 stops running, the elastic force of the spring 543 pushes the sliding rod 542 back to its original position, thus restoring the original state. Figure 3 The machine is in a shutdown state as shown.

[0045] like Figure 4As shown, the end of the fixed box 541 near the blocking plate 544 is flat, and the end of the fixed box 541 near the blocking plate 544 is preferably circular. The blocking plate 544 is also preferably circular, and the diameter of the end of the fixed box 541 near the blocking plate 544 is not less than the diameter of the blocking plate 544. When the auger shaft 52 rotates, the counterweight 547 moves away from the slide bar 542, and the blocking plate 544 abuts against the fixed box 541, thereby preventing the material being conveyed from squeezing the side of the blocking plate 544 away from the material passage hole 501, preventing the slide bar 542 from shaking at this time, and ensuring the normal operation of the device.

[0046] To maintain the balance and stability of the opening and closing device 54, it is preferable to provide multiple first connecting rods 545, multiple second connecting rods 546, and multiple counterweights 547. The multiple first connecting rods 545, multiple second connecting rods 546, and multiple counterweights 547 are arranged in a circular array around the axis of the sliding rod 542, and correspond one-to-one.

[0047] like Figure 5 As shown, the opening and closing device 54 is also provided with a spiral blade 548, which is fixedly mounted on the slide rod 542. When the auger shaft 52 rotates and the counterweight 547 moves away from the slide rod 542, the spiral blade 548 also abuts against the side of the sealing plate 53 away from the auger shaft 52. The rotation of the spiral blade 548 drives the material at the sealing plate 53 to avoid the material passage hole 501 from being blocked.

[0048] like Figures 4-6 As shown, the spiral direction of the spiral blade 548 is the same as that of the auger shaft 52. When the auger shaft 52 drives the material in the circulation hopper 3 into the packaging hopper 1, the end of the spiral blade 548 closest to the sealing plate 53 preferentially contacts the material at the material passage hole 501. At this time, the rotating spiral blade 548 can apply a force away from the material at the material passage hole 501, preventing the material passage hole 501 from being blocked. When the auger shaft 52 drives the material in the packaging hopper 1 into the circulation hopper 3, the end of the spiral blade 548 furthest from the sealing plate 53 preferentially contacts the material at the material passage hole 501. At this time, the rotating spiral blade 548 can apply a force close to the material at the material passage hole 501, allowing the material to quickly enter the material passage hole 501 and improving the material conveying efficiency.

[0049] To maintain the balance and stability of the opener 54, it is preferable to provide multiple helical blades 548, which are arranged in a circular array around the axis of the slide bar 542.

[0050] To ensure the efficiency of material passing through the feed hole 501, such as Figure 7 As shown, the material passage 501 is set as an arc-shaped hole, so that the material conveyed along the spiral path can move within the material passage 501 along the cross-section of the material passage 501, thus avoiding the occurrence of blockage problems.

[0051] like Figure 4 As shown, when the blocking plate 544 abuts against the fixing box 541, the spiral blade 548 also abuts against the sealing plate 53. At this time, the sliding rod 542 will not continue to approach the auger shaft 52, which can limit the movement range of the counterweight 547, avoid friction between the counterweight 547 and the inner wall of the fixing box 541, and thus prevent the counterweight 547 from being worn and affecting the opening and closing ability of the opener 54. In order to extend the service life of the device, all components in the opener 54 should be made of wear-resistant materials.

[0052] like Figure 5 and Figure 7 As shown, a groove 502 is provided on the side of the sealing plate 53 away from the auger shaft 52. The material passage hole 501 is connected to the groove 502. When the spiral blade 548 abuts against the sealing plate 53, the spiral blade 548 is located in the groove 502, which can reduce the impact of the material in the packaging hopper 1 on the spiral blade 548 and extend the service life of the spiral blade 548.

[0053] During the shutdown of the screw conveyor 5, the screw blade 548 is inside the material in the packaging hopper 1. There is material between the screw blade 548 and the sealing plate 53. This material can limit the screw blade 548, prevent the slide bar 542 from sliding, and thus reduce the burden on the spring 543.

[0054] like Figure 1 As shown, under the condition of using a single material, the material can be directly transported to the top of the packaging hopper 1 using a conveyor belt. Therefore, the circulating hopper 3, the elevator 4, and the screw conveyor 5 can be disassembled.

[0055] Therefore, the outer cylinder 51 is configured to include a first cylinder body 511 and a second cylinder body 512, and the auger shaft 52 is configured to include a first shaft body 521 and a second shaft body 522, as follows. Figure 2 and Figure 8 As shown, the first cylinder 511 is fixedly installed inside the packaging hopper 1, and the second cylinder 512 is fixedly installed on the circulation hopper 3. The first cylinder 511 and the second cylinder 512 are detachably fixedly connected. The first shaft 521 is rotatably installed inside the first cylinder 511, and the second shaft 522 is rotatably installed inside the second cylinder 512 and is detachably fixedly connected to the first shaft 521. The second shaft 522 is coaxially fixed to the output shaft of the motor. When it is necessary to disassemble the screw conveyor 5, the first cylinder 511 and the second cylinder 512, as well as the first shaft 521 and the second shaft 522, can be disassembled. The connection between the first cylinder 511 and the second cylinder 512, and the connection between the first shaft 521 and the second shaft 522, can both be achieved by bolt fixing.

[0056] like Figure 2 and Figure 8As shown, the connection positions of the first cylinder 511 and the second cylinder 512, and the connection positions of the first shaft 521 and the second shaft 522, are not flush. Instead, one end of the second shaft 522 extends into the first cylinder 511, allowing the two to rotate and connect. This structural design not only increases the connection reliability of the two sections of the screw conveyor 5, but also reduces the weight of the screw conveyor 5 remaining on the packaging hopper 1.

[0057] like Figure 8 As shown, an assembly hole 503 is provided on the periphery of the first cylinder 511. One end of the first shaft 521 near the second shaft 522 is located at the assembly hole 503. An assembly cover 513 is provided inside the outer cylinder 51. The assembly cover 513 is detachably fixed to the first cylinder 511 by means of bolts or other means, and seals the assembly hole 503. By disassembling and assembling the assembly cover 513, the first shaft 521 and the second shaft 522 can be easily disassembled, assembled, and maintained.

[0058] The elevator 4 is a device with lifting and conveying functions, and its structure can be the same as or similar to that of the screw conveyor 5.

[0059] like Figure 9 and Figure 10 As shown, the packaging hopper 2 includes two metering hoppers 21, a confluence hopper 22, a rotating plate 23, and a telescopic cylinder 24. The metering hoppers 21 are fixedly installed at the lower end of the packaging hopper 1, and the two metering hoppers 21 are arranged side by side. The confluence hopper 22 is fixedly installed at the lower end of the two metering hoppers 21. There are two rotating plates 23 and two telescopic cylinders 24, and each rotating plate 23 and telescopic cylinder 24 corresponds to a metering hopper 21. The rotating plate 23 is rotatably installed on the metering hopper 21, and the telescopic cylinder 24 is fixedly installed on the metering hopper 21. The output end of the telescopic cylinder 24 is connected to the rotating plate 23. When the output end of the telescopic cylinder 24 extends, it can drive the rotating plate 23 to rotate, so that the material in the metering hopper 21 enters the confluence hopper 22. When the output end of the telescopic cylinder 24 retracts, it can drive the rotating plate 23 to block the metering hopper 21 and prevent the material from falling further.

[0060] like Figure 9 As shown, the packaging bag is installed at the lower end of the confluence hopper 22. By using the alternating operation of the two telescopic cylinders 24, the packaging efficiency of the material can be further improved.

[0061] The method of using the negative pressure space packaging device of the present invention is as follows:

[0062] S1, add the material to be packaged into the circulating hopper 3, and adjust the rotation direction of the motor to make the conveying direction of the screw conveyor 5 the same as that of the elevator 4. Depending on the actual situation, select the elevator 4 and / or the screw conveyor 5 to convey the material in the circulating hopper 3 into the packaging hopper 1.

[0063] S2, after the material in the circulating hopper 3 is added to the packaging hopper 1, the conveying direction of the screw conveyor 5 is reversed by adjusting the rotation direction of the motor, so that the material is circulated between the packaging hopper 1 and the circulating hopper 3 to avoid problems such as material caking and stratification.

[0064] S3, the packaging bag is installed at the lower end of the sealing hopper 2, and the material is allowed to enter the packaging bag through the sealing hopper 2 by controlling the two telescopic cylinders 24.

[0065] S4. Vacuum the inside of the packaging bag and sew the bag opening to achieve vacuum packaging of the material.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A negative pressure space packaging apparatus, characterized by: The packaging hopper (1), the packaging hopper (2), the circulating hopper (3), the elevator (4) and the screw conveyor (5) are included, wherein, The packaging hopper (2) is fixedly arranged at the lower end of the packaging hopper (1); The circulating hopper (3) is arranged below the packaging hopper (1) on one side; One end of the elevator (4) is communicated in the circulating hopper (3), and the other end is located above the packaging hopper (1); One end of the screw conveyor (5) is communicated below the packaging hopper (1), and the other end is communicated at the bottom side of the circulating hopper (3); The screw conveyor (5) can be bidirectional, and when the conveying direction of the screw conveyor (5) is the same as that of the elevator (4), the material in the circulating hopper (3) is added to the packaging hopper (1); when the conveying direction of the screw conveyor (5) is opposite to that of the elevator (4), the material is circulated between the packaging hopper (1) and the circulating hopper (3); The screw conveyor (5) includes an outer cylinder (51), an auger shaft (52), a sealing plate (53) and an opener (54), the outer cylinder (51) is fixedly arranged through the packaging hopper (1); the auger shaft (52) is rotatably arranged in the outer cylinder (51); the sealing plate (53) is fixedly arranged at the end of the outer cylinder (51) and located in the packaging hopper (1), and a material passing hole (501) is arranged in the sealing plate (53); the opener (54) is arranged on the auger shaft (52), and when the auger shaft (52) rotates, the opener (54) does not block the material passing hole (501), and when the auger shaft (52) does not rotate, the opener (54) blocks the material passing hole (501); The opener (54) includes a fixed box (541), a sliding rod (542), a spring (543), a blocking plate (544), a first connecting rod (545), a second connecting rod (546) and a counterweight (547), the fixed box (541) is fixedly arranged in the outer cylinder (51), and the end of the auger shaft (52) is rotatably arranged in the fixed box (541); the sliding rod (542) is slidably arranged on the auger shaft (52) and rotatably and slidably connected with the sealing plate (53); the spring (543) is arranged between the sliding rod (542) and the auger shaft (52); the blocking plate (544) is fixedly arranged on the sliding rod (542) and blocks the material passing hole (501); one end of the first connecting rod (545) is rotatably arranged on the sliding rod (542); one end of the second connecting rod (546) is rotatably arranged on the auger shaft (52), and the other end of the second connecting rod (546) is rotatably connected with the other end of the first connecting rod (545); and the counterweight (547) is fixedly arranged on the first connecting rod (545).

2. A negative pressure space packaging apparatus according to claim 1, wherein: The fixed box (541) is flat at one end close to the blocking plate (544), when the auger shaft (52) rotates, the counterweight (547) is away from the slide rod (542), and the blocking plate (544) abuts against the fixed box (541).

3. A negative pressure space packaging apparatus according to claim 1, wherein: The opening and closing device (54) further comprises a spiral blade (548), which is fixedly arranged on the slide rod (542), when the counterweight (547) is away from the slide rod (542), the spiral blade (548) abuts against one side of the sealing plate (53) away from the auger shaft (52).

4. A negative pressure space packaging apparatus according to claim 3, wherein: The spiral direction of the spiral blade (548) is the same as the spiral direction of the auger shaft (52).

5. A negative pressure space packaging apparatus according to claim 4, wherein: One side of the sealing plate (53) away from the auger shaft (52) is provided with a containing groove (502), the material passing hole (501) is in communication with the containing groove (502), and when the spiral blade (548) abuts against the sealing plate (53), the spiral blade (548) is located in the containing groove (502).

6. A negative pressure space packaging apparatus according to claim 1, wherein: The outer cylinder (51) comprises a first cylinder body (511), a second cylinder body (512) and a assembly cover (513), the first cylinder body (511) and the second cylinder body (512) are detachably fixedly connected, and an assembly hole (503) is formed in the side of the first cylinder body (511); the assembly cover (513) is detachably fixed on the first cylinder body (511) and blocks the assembly hole (503); The auger shaft (52) comprises a first shaft body (521) and a second shaft body (522), the first shaft body (521) is rotatably arranged in the first cylinder body (511); the second shaft body (522) is rotatably arranged in the second cylinder body (512) and the first cylinder body (511) and is detachably fixedly connected with the first shaft body (521), and one end of the first shaft body (521) close to the second shaft body (522) is located at the assembly hole (503).

7. A negative pressure space packaging apparatus according to claim 1, wherein: The packaging hopper (2) comprises two dosing hoppers (21), a confluence hopper (22), a rotating plate (23) and a telescopic cylinder (24), the dosing hopper (21) is fixedly arranged at the lower end of the packaging hopper (1), and two dosing hoppers (21) are arranged side by side; the confluence hopper (22) is fixedly arranged at the lower end of the two dosing hoppers (21); the rotating plate (23) is rotatably arranged on the dosing hopper (21), and the rotating plate (23) corresponds to the dosing hopper (21) one by one; the telescopic cylinder (24) is fixedly arranged on the dosing hopper (21), and the output end thereof is connected with the rotating plate (23) to drive the rotating plate (23) to block the dosing hopper (21).

8. A method of negative pressure space packaging using the negative pressure space packaging apparatus according to any one of claims 1 to 7, characterized by, The method comprises the following steps: S1, adding material into the circulating hopper (3), making the conveying direction of the screw conveyor (5) the same as the conveying direction of the elevator (4), and conveying the material into the packaging hopper (1) by the elevator (4) and / or the screw conveyor (5); S2, the conveying direction of the screw conveyor (5) is opposite to the conveying direction of the elevator (4), so as to circularly convey the material between the packaging hopper (1) and the circulating hopper (3); S3, a packaging bag is installed at the lower end of the sealing hopper (2), and the material enters the packaging bag through the sealing hopper (2); S4, the inside of the packaging bag is vacuumized, and the bag opening of the packaging bag is sewed.

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