Nitrogen sealing device for vibrating screen of freezing edge trimmer

Abstract

The utility model relates to a freezing edge trimmer vibrating screen nitrogen sealing device, and relates to the technical field of freezing edge trimmers, the freezing edge trimmer vibrating screen nitrogen sealing device comprises an edge trimming chamber and a vibrating screen, the bottom of the edge trimming chamber communicates with a top cover of the vibrating screen through a first flexible pipe, and the top cover of the vibrating screen is provided with a discharging port communicating with the first flexible pipe; the vibrating screen is provided with a second flexible pipe, the second flexible pipe is externally connected with a nitrogen supply unit, an outlet of the second flexible pipe is inserted into the vibrating screen and faces the blanking port, and nitrogen is led to the blanking port along the second flexible pipe and forms an air curtain covering the blanking port. The vibrating screen has the effects that air in the trimming chamber is prevented from entering the vibrating screen, shot blasting and chippings are prevented from being adhered to the vibrating screen, and the screening efficiency of the vibrating screen is improved.

Description

Technical Field

[0001] The present application relates to the technical field of cryogenic trimming machines, and particularly to a nitrogen sealing device for a vibrating screen of a cryogenic trimming machine. Background Art

[0002] The working principle of a cryogenic trimming machine is to utilize the low-temperature freezing effect of liquid nitrogen to embrittle products made of rubber, plastic, or zinc-magnesium aluminum alloy materials, and to remove the burrs by high-speed spraying of shot pellets hitting the burrs of the products, so as to remove the burrs with high efficiency and high precision. Due to its advantages such as high efficiency and good quality, it is widely used in the rubber, plastic, and die-casting industries.

[0003] A cryogenic trimming machine includes a trimming chamber and a vibrating screen. After the shot pellets hit the products, they fall into the vibrating screen together with the debris for screening. However, when the trimming chamber is opened, air will enter the low-temperature vibrating screen along the trimming chamber and the pipeline, which will cause the moisture in the air to freeze and stick the shot pellets and debris to the vibrating screen, resulting in a reduction in the screening efficiency of the vibrating screen. Therefore, it is urgent to develop a sealing device for the vibrating screen of a cryogenic trimming machine. Utility Model Content

[0004] In order to improve the problem that the air in the trimming chamber enters the vibrating screen, causing the shot pellets and debris to stick to the vibrating screen and resulting in a reduction in the screening efficiency of the vibrating screen, the present application provides a nitrogen sealing device for a vibrating screen of a cryogenic trimming machine.

[0005] The nitrogen sealing device for a vibrating screen of a cryogenic trimming machine provided by the present application adopts the following technical solutions:

[0006] A nitrogen sealing device for a vibrating screen of a cryogenic trimming machine includes a trimming chamber and a vibrating screen. The bottom of the trimming chamber is communicated with the top cover of the vibrating screen through a first flexible pipe. A material dropping port communicated with the first flexible pipe is arranged on the top cover of the vibrating screen. A second flexible pipe is arranged on the vibrating screen. The second flexible pipe is externally connected with a nitrogen supply unit. The outlet of the second flexible pipe is inserted into the vibrating screen and faces the material dropping port. Nitrogen flows along the second flexible pipe to the material dropping port and forms an air curtain covering the material dropping port.

[0007] By adopting the above technical solutions, when the trimming chamber is opened, the nitrogen supply unit guides nitrogen to blow towards the material dropping port through the first flexible pipe, forming an air curtain at the material dropping port to block the material dropping port, so as to effectively prevent the air in the trimming chamber from entering the vibrating screen and prevent the shot pellets and debris from sticking to the vibrating screen, thereby improving the screening efficiency of the vibrating screen.

[0008] In a specific feasible implementation, a nitrogen control valve is arranged on the second flexible pipe, and the nitrogen control valve is opened or closed as the trimming chamber is opened or closed.

[0009] By adopting the above technical solution, the opening and closing of nitrogen are controlled by the nitrogen control valve to be consistent with the opening and closing of the trimming chamber, which facilitates the control of nitrogen flow.

[0010] In a specific feasible implementation, an air distribution box is provided on the inner side of the top cover, and air distribution holes communicating with the blanking port are provided in the middle of the air distribution box;

[0011] A number of connecting pipes are communicated with the second flexible pipe, and the number of connecting pipes is inserted into the air distribution box and uniformly arranged along the circumference of the air distribution box, so that nitrogen can be blown into the air distribution holes from the connecting pipes.

[0012] By adopting the above technical solution, when blocking the blanking port, nitrogen is introduced into the air distribution box from the second flexible pipe through a plurality of connecting pipes, and then blown towards the air distribution holes along the radial direction of the air distribution box at the same time, forming an air curtain in the air distribution holes. In the air curtain formed in this way, the moving distance of nitrogen is short, the wind speed is fast, and the air volume is large, thereby improving the effect of the air curtain on blocking air.

[0013] In a specific feasible implementation, a number of groups of first air guiding plates are provided in the air distribution box, each second flexible pipe corresponds to a group of first air guiding plates, the number of each group of first air guiding plates is two, and a first air guiding channel opposite to the connecting pipe is formed between the two first air guiding plates, and the distance between the two first air guiding plates gradually increases along the radial direction of the air distribution box towards the air distribution holes.

[0014] By adopting the above technical solution, when nitrogen enters the air box, the nitrogen in the middle flows along the first air guiding channel towards the air distribution holes, and the nitrogen coming out of the second flexible pipe is guided to both sides by the two first air guiding plates, thereby improving the uniformity of the air curtain.

[0015] In a specific feasible implementation, a number of groups of second air guiding plates are provided in the air distribution box, the number of each group of second air guiding plates is two, each group of two second air guiding plates are respectively arranged on both sides of each group of first air guiding plates, the distance between the two second air guiding plates gradually increases along the radial direction of the air distribution box towards the air distribution holes, and a second air guiding channel is formed between each second air guiding plate and the adjacent first air guiding plate, and a third air guiding channel is formed between two adjacent second air guiding plates of different groups.

[0016] By adopting the above technical solution, the nitrogen guided by the first air guiding plate is divided into two parts by the second air guiding plate, one part flows along the second air guiding channel towards the air distribution holes, and the other part flows along the third air guiding channel towards the air distribution holes, thereby further improving the uniformity of the air curtain.

[0017] In a specific feasible implementation, a plurality of third air guiding plates are provided in the air distribution box. The number of the third air guiding plates is the sum of the numbers of the first air guiding plate and the second air guiding plate. Each of the third air guiding plates is arranged along the radial direction of the air distribution box, and one end of each third air guiding plate is connected to the first air guiding plate or the second air guiding plate.

[0018] By adopting the above technical solution, the flow directions of the nitrogen gas flows flowing out of the first air guiding channel, the second air guiding channel, and the third air guiding channel are adjusted by the third air guiding plates, so that the flow directions of the nitrogen gas flows all face the axis of the air distribution holes, making the air curtain more uniform and having a better air blocking effect.

[0019] In a specific feasible implementation, the nitrogen supply unit includes an evaporation pipe and a liquid nitrogen pipe. One end of the evaporation pipe is communicated with the liquid nitrogen pipe, and the other end is communicated with the second flexible pipe. One end of the evaporation pipe is spirally arranged towards the other end.

[0020] By adopting the above technical solution, the liquid nitrogen pipe for supplying liquid nitrogen to the trimming chamber is used as the liquid nitrogen source. The liquid nitrogen flows into the evaporation pipe, is heated and vaporized in the evaporation pipe, and then is input into the second flexible pipe, without the need to add additional nitrogen supply equipment, improving the convenience of nitrogen input.

[0021] In a specific feasible implementation, a mounting plate is provided on the air distribution box. Bolts are provided on the mounting plate. The bolts pass through the mounting plate and the top cover. A nut is threadedly sleeved on one end of the bolt passing through the top cover. A stop washer is provided between the nut and the top cover, and the nut can tightly press and fix the stop washer on the top cover.

[0022] By adopting the above technical solution, the air distribution box is installed on the top cover through bolts, and then the anti-vibration ability of the air distribution box is improved by using the stop washer, making the installation of the air distribution box more stable.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. When the trimming chamber is opened, the nitrogen supply unit guides nitrogen to blow towards the blanking port through the first flexible pipe, forming an air curtain at the blanking port to block the blanking port, so as to effectively prevent the air in the trimming chamber from entering the vibrating screen, and prevent shot peening and debris from adhering to the vibrating screen, thereby improving the screening efficiency of the vibrating screen;

[0025] 2. When blocking the blanking port, nitrogen is introduced into the air distribution box through the second flexible pipe, and then blows towards the air distribution holes along the radial direction of the air distribution box at the same time, forming an air curtain in the air distribution holes. In the air curtain formed in this way, the moving distance of nitrogen is short, the wind speed is fast, and the air volume is large, thereby improving the air blocking effect of the air curtain. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a nitrogen sealing device for a vibrating screen of a cryogenic trimming machine according to an embodiment of the present application.

[0027] Figure 2 It is a schematic structural diagram for showing the vibrating screen.

[0028] Figure 3 It is along Figure 2 A cross-sectional view taken along line A-A in

[0029] Figure 4 It is Figure 3 An enlarged view of part B in

[0030] Figure 5 It is a schematic structural diagram for showing the air distribution box.

[0031] Figure 6 It is along Figure 5 A cross-sectional view taken along line C-C in

[0032] Description of the reference numerals: 1. Trimming chamber; 2. Vibrating screen; 21. Top cover; 211. Material dropping port; 3. Liquid nitrogen tank; 4. Nitrogen supply unit; 41. Evaporation pipe; 42. Liquid nitrogen pipe; 51. First flexible pipe; 52. Second flexible pipe; 521. Nitrogen control valve; 522. Connecting pipe; 61. Air distribution box; 611. Air distribution holes; 62. Mounting plate; 631. Bolt; 632. Nut; 633. Lock washer; 641. First air guiding plate; 642. Second air guiding plate; 643. First air guiding channel; 644. Second air guiding channel; 645. Third air guiding channel; 646. Third air guiding plate. Detailed Description of the Embodiment

[0033] The following further elaborates on the present application in conjunction with the attached Figures 1-6 drawings.

[0034] An embodiment of the present application discloses a nitrogen sealing device for a vibrating screen of a cryogenic trimming machine.

[0035] Referring to Figure 1 , Figure 2, A nitrogen sealing device for the vibrating screen of a freeze trimming machine includes a trimming chamber 1, a vibrating screen 2, a liquid nitrogen tank 3, and a nitrogen supply unit 4. The trimming chamber 1 is arranged above the vibrating screen 2. The vibrating screen 2 has a three-layer screening structure. The top of the vibrating screen 2 is a top cover 21 for sealing. A material dropping port 211 is provided at the center position of the top cover 21. The bottom of the trimming chamber 1 is communicated with the material dropping port 211 through a first flexible pipe 51. The first flexible pipe 51 is a corrugated pipe made of cloth material. One end of the first flexible pipe 51 is fixedly connected to the trimming chamber 1, and the other end is fixedly connected to the top cover 21. In this embodiment, the nitrogen supply unit 4 includes an evaporation pipe 41 and a liquid nitrogen pipe 42. One end of the liquid nitrogen pipe 42 is communicated with the liquid nitrogen tank 3, and the other end is communicated with the trimming chamber 1. One end of the evaporation pipe 41 is inserted into the liquid nitrogen pipe 42 and communicated with the liquid nitrogen pipe 42. The other end is fixedly communicated with a second flexible pipe 52. A nitrogen control valve 521 is provided on the second flexible pipe 52. One end of the evaporation pipe 41 is spirally arranged towards the other end. The second flexible pipe 52 is inserted into the vibrating screen 2. The outlet of the second flexible pipe 52 faces the material dropping port 211 and forms an air curtain covering the material dropping port 211.

[0036] When the trimming chamber 1 is opened for discharging, the nitrogen control valve 521 is opened. The liquid nitrogen in the liquid nitrogen pipe 42 flows along the evaporation pipe 41, is heated and vaporized to form high-pressure nitrogen, and then is introduced into the material dropping port 211 through the second flexible pipe 52, and an air curtain is formed at the material dropping port 211, so as to prevent the air in the trimming chamber 1 from flowing into the vibrating screen 2, effectively avoiding the adhesion of shot and debris on the vibrating screen 2, thereby improving the screening efficiency of the vibrating screen 2.

[0037] When the high-pressure nitrogen can flow into the vibrating screen 2, the pressure inside the vibrating screen 2 increases, which can prevent air from entering the vibrating screen 2 through the material dropping port 211 on the vibrating screen 2. At the same time, the high-pressure nitrogen flows into the trimming chamber 1 along the first flexible pipe 51, and at the same time reduces the amount of air entering after the trimming chamber 1 is opened.

[0038] Refer to Figure 3 , Figure 4 , the bottom of the top cover 21 is the inner side, and the top is the outer side. An air distribution box 61 is provided on the inner side of the top cover 21. The air distribution box 61 is in a disc shape. An installation plate 62 is fixedly provided on the outer edge of the air distribution box 61. The installation plate 62 is integrally formed with the air distribution box 61. The installation plate 62 is arranged in a circle along the circumference of the air distribution box 61. A plurality of bolts 631 are provided on the installation plate 62. The plurality of bolts 631 are evenly arranged along the circumference of the installation plate 62. The bolts 631 sequentially pass through the installation plate 62 and the top cover 21. A nut 632 is sleeved on one end of the bolt 631 passing through the top rod. A stop washer 633 is provided between the nut 632 and the top cover 21. The nut 632 is screwed to press the stop washer 633 against the top cover 21.

[0039] Refer to Figure 3, a blast distribution box 61 is provided with a blast distribution hole 611 coaxially communicated with the blanking port 211 at the center. The blast distribution hole 611 penetrates from the inner cavity of the blast distribution box 61 to the upper and lower side walls. The second flexible pipe 52 is arranged in a circle along the top layer of the vibrating screen 2. Six connecting pipes 522 are communicated with the second flexible pipe 52. All six connecting pipes 522 pass through the vibrating screen 2 and are inserted into the blast distribution box 61, and are evenly arranged along the circumferential direction of the blast distribution box 61. The outlet of each connecting pipe 522 faces the blast distribution hole 611.

[0040] Refer to Figure 5 , Figure 6 , a number of groups of first air guiding plates 641 and second air guiding plates 642 are arranged in the blast distribution box 61. The number of both the first air guiding plates 641 and the second air guiding plates 642 is six groups. Each connecting pipe 522 corresponds to a group of first air guiding plates 641 and a group of second air guiding plates 642. The number of each group of first air guiding plates 641 and second air guiding plates 642 is two. Both ends of the two first air guiding plates 641 and the second air guiding plates 642 are fixedly connected to the top wall and the bottom wall of the blast distribution box 61. The two first air guiding plates 641 are arranged at the outlet of the connecting pipe 522. A first air guiding channel 643 is formed between the two first air guiding plates 641. The distance between the two first air guiding plates 641 gradually increases along the radial direction of the blast distribution box 61 towards the blast distribution hole 611. The first air guiding channel 643 is arranged opposite to the outlet of the second flexible pipe 52. The minimum distance between the two first air guiding plates 641 is equal to one-fourth of the pipe diameter of the connecting pipe 522.

[0041] Refer to Figure 5 , Figure 6 , the two second air guiding plates 642 in each group are respectively arranged on both sides of each group of first air guiding plates 641. The distance between the two second air guiding plates 642 gradually increases along the radial direction of the blast distribution box 61 towards the blast distribution hole 611. A second air guiding channel 644 is formed between each second air guiding plate 642 and the adjacent first air guiding plate 641. A third air guiding channel 645 is formed between the adjacent two second air guiding plates 642 in different groups. Twenty-four third air guiding plates 646 are fixedly arranged in the blast distribution box 61. The number of the twenty-four third air guiding plates 646 is evenly arranged along the circumferential direction of the blast distribution box 61. Each third air guiding plate 646 is arranged along the radial direction of the blast distribution box 61. One end of each third air guiding plate 646 far away from the blast distribution hole 611 is fixedly connected to the first air guiding plate 641 or the second air guiding plate 642. There is a space between one end of the third air guiding plate 646 close to the blast distribution hole 611 and the blast distribution hole 611.

[0042] When nitrogen enters the air distribution box 61, two first air guiding plates 641 in the same group divide the nitrogen gas flow coming out of the connecting pipe 522 into three parts. One part flows into the first air guiding channel, and the other two parts flow along the two first air guiding plates 641 to conduct a primary distribution of the nitrogen gas flow. Then, the second air guiding plate 642 is used to divide the nitrogen gas flow guided by the first air guiding plate 641 into two parts. One part flows along the second air guiding channel 644 towards the air distribution holes 611, and the other part flows along the third air guiding channel 645 towards the air distribution holes 611 to conduct a secondary distribution of the nitrogen gas flow. By distributing the nitrogen gas on both sides, the flow of the nitrogen gas flow can be made more uniform, thereby improving the uniformity of the air curtain.

[0043] The third air guiding plate 646 is used to adjust the flow direction of the nitrogen gas flow flowing out of the first air guiding channel 643, the second air guiding channel 644, and the third air guiding channel 645, so that the flow direction of the nitrogen gas flow all faces the axis of the air distribution holes 611, making the air curtain more uniform and having a better air blocking effect. By blowing the nitrogen gas flow towards the air distribution holes 611 simultaneously, an air curtain is formed in the air distribution holes 611, so that the moving distance of the nitrogen gas is short, the wind speed is fast, and the air volume is large, thereby improving the air blocking effect of the air curtain.

[0044] The implementation principle of the nitrogen sealing device of the vibrating screen of the freezing trimming machine in the embodiment of the present application is as follows: When the trimming chamber 1 is opened for discharging, the nitrogen control valve 521 is opened, and the liquid nitrogen in the liquid nitrogen pipe 42 flows along the evaporation pipe 41, heats up and vaporizes to form high-pressure nitrogen gas, and then enters the air distribution box 61 through the second flexible pipe 52. The nitrogen gas flow flows into the air distribution holes 611 under the guidance of the first air guiding plate 641, the second air guiding plate 642, and the third air guiding plate 646, and an air curtain is formed in the air distribution holes 611, so that the air in the trimming chamber 1 can be prevented from flowing into the vibrating screen 2, effectively avoiding the adhesion of shot and debris on the vibrating screen 2, thereby improving the screening efficiency of the vibrating screen 2.

[0045] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A nitrogen sealing device for a vibration screen of a freezing trimming machine, comprising a trimming chamber (1) and a vibration screen (2), wherein the bottom of the trimming chamber (1) and a top cover (21) of the vibration screen (2) are connected via a first flexible pipe (51), characterized in that: The top cover (21) of the vibrating screen (2) is provided with a material drop opening (211) which is in communication with the first flexible tube (51); the vibrating screen (2) is provided with a second flexible tube (52); the second flexible tube (52) is externally connected to a nitrogen supply unit (4); an outlet of the second flexible tube (52) is inserted into the vibrating screen (2) and faces the material drop opening (211); nitrogen flows along the second flexible tube (52) to the material drop opening (211) and forms an air curtain covering the material drop opening (211).

2. The vibration screen nitrogen sealing device for a freezing trimming machine according to claim 1, characterized in that: The second flexible pipe (52) is provided with a nitrogen control valve (521), and the nitrogen control valve (521) is opened or closed as the trimming chamber (1) is opened or closed.

3. The vibration screen nitrogen sealing device for a freezing trimming machine according to claim 1, characterized in that: An air distribution box (61) is provided on the inner side of the top cover (21), and an air distribution hole (611) is provided in the middle of the air distribution box (61) and is connected to the blanking opening (211); The second flexible tube (52) is connected to a plurality of connecting tubes (522), which are inserted into the air distribution box (61) and are evenly arranged along the circumference of the air distribution box (61), so that nitrogen can be blown into the air distribution hole (611).

4. The vibration screen nitrogen sealing device for a freezing trimming machine according to claim 3, characterized in that: A plurality of groups of first air guide plates (641) are arranged in the air distribution box (61), each connecting tube (522) corresponds to a group of the first air guide plates (641), and each group of the first air guide plates (641) has two first air guide plates (641). A first air guide channel (643) opposite to the connecting tube (522) is formed between the two first air guide plates (641), and the distance between the two first air guide plates (641) gradually increases along the radial direction of the air distribution box (61) toward the air distribution hole (611).

5. The vibration screen nitrogen sealing device for a freezing trimming machine according to claim 4, characterized in that: A plurality of groups of second air guide plates (642) are arranged in the air distribution box (61), and the number of the second air guide plates (642) in each group is two. The two second air guide plates (642) in each group are respectively arranged on both sides of each group of the first air guide plates (641). The distance between the two second air guide plates (642) gradually increases along the radial direction of the air distribution box (61) toward the air distribution hole (611). A second air guide channel (644) is formed between each second air guide plate (642) and the adjacent first air guide plate (641), and a third air guide channel (645) is formed between two adjacent second air guide plates (642) in different groups.

6. The vibration screen nitrogen sealing device for a freezing trimming machine according to claim 5, characterized in that: A plurality of third air guide plates (646) are provided in the air distribution box (61), and the number of the third air guide plates (646) is the sum of the number of the first air guide plates (641) and the second air guide plates (642). Each of the third air guide plates (646) is arranged along the radial direction of the air distribution box (61), and one end of the third air guide plate (646) is connected to the first air guide plate (641) or the second air guide plate (642).

7. The vibration screen nitrogen sealing device for a freezing trimming machine according to claim 3, characterized in that: The nitrogen supply unit (4) comprises an evaporation tube (41) and a liquid nitrogen tube (42); one end of the evaporation tube (41) is connected to the liquid nitrogen tube (42), and the other end is connected to the second flexible tube (52); one end of the evaporation tube (41) is spirally arranged toward the other end.

8. The vibration screen nitrogen sealing device for a freezing trimming machine according to claim 3, characterized in that: The air distribution box (61) is provided with a mounting plate (62), and the mounting plate (62) is provided with a bolt (631), and the bolt (631) passes through the mounting plate (62) and the top cover (21), and one end of the bolt (631) passes through the top cover (21) and is threadedly sleeved with a nut (632), and a stop washer (633) is provided between the nut (632) and the top cover (21), and the nut (632) can press and fix the stop washer (633) on the top cover (21).

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