Freezing deflashing vibrating screen with nitrogen sealing protection

Abstract

The utility model relates to the technical field of freezing and deflashing equipment, in particular to a freezing and deflashing vibrating screen with nitrogen sealing protection, which comprises a screen box, the top of the screen box is provided with a feed port, the side wall of the screen box is provided with a discharge port, and a screen mesh is arranged in the screen box; the vibration driving device is fixedly mounted at the bottom of the screen box; the liquid nitrogen supply system comprises a liquid nitrogen supply source, an annular nitrogen curtain assembly and a sieve bottom purging assembly, wherein the annular nitrogen curtain assembly and the sieve bottom purging assembly communicate with the liquid nitrogen supply source through connecting pipelines. The annular nitrogen curtain assembly comprises at least one annular pipe arranged above the screen, and nozzles for spraying nitrogen to the surface of the screen are arranged on the annular pipes. The screen bottom blowing assembly comprises a blowing pipe arranged below the screen, and blowing holes vertically facing the back face of the screen are formed in the blowing pipe. Compared with the prior art, external air can be effectively isolated from making contact with the low-temperature screen, condensation and freezing of water vapor on the surface of the screen are remarkably reduced, and the cleanliness of the screen and the stability of the follow-up deflashing effect are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to frozen flash removal equipment technical field especially relates to a frozen flash removal vibrating screen with nitrogen seal protection. BACKGROUND

[0002] The frozen flash removal technology is a process that makes the flash of the elastomer workpiece such as rubber and plastic lose elasticity and become brittle by using low temperature environment, and then separates the brittle flash from the surface of the workpiece by physical actions such as vibration and impact. Because of the characteristics of high flash removal efficiency and small damage to the workpiece, the frozen flash removal technology is widely used in the processing links of precision products such as automobile seals, electronic connectors and medical devices. In this technology, the vibrating screen is one of the core components, which realizes the separation of the workpiece and the flash by continuous vibration, and classifies and discharges the qualified workpiece and the fallen flash.

[0003] The existing frozen flash removal equipment usually relies on the filling of liquid nitrogen to realize the low temperature environment to ensure the flash brittleness effect. However, after the equipment stops running, the vibrating screen (especially the screen mesh) in the low temperature state will quickly adsorb the water vapor in the air, resulting in the phenomenon of dew condensation or even icing on the surface of the screen mesh and in the screen hole. When the equipment is started again, the ice layer will hinder the effective contact between the workpiece and the screen mesh, reducing the efficiency of the vibration stripping of the flash. At the same time, the icing may cause the blockage of the screen hole, affecting the screening and discharging of the workpiece, not only reducing the stability of the flash removal effect, but also increasing the frequency of screen cleaning and maintenance, and improving the production cost. UTILITY MODEL CONTENT

[0004] To solve the technical problems existing in the background technology, the utility model provides a frozen flash removal vibrating screen with nitrogen seal protection.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A frozen flash removal vibrating screen with nitrogen seal protection comprises:

[0007] A screen box is provided with a feed inlet at the top and a discharge outlet at the side wall, and a screen mesh is arranged inside;

[0008] A vibration driving device is fixedly installed at the bottom of the screen box;

[0009] A liquid nitrogen supply system comprises a liquid nitrogen supply source, and a ring-shaped nitrogen curtain assembly and a screen bottom purging assembly which are in communication with the liquid nitrogen supply source through connecting pipelines;

[0010] The ring-shaped nitrogen curtain assembly comprises at least one ring-shaped pipe arranged above the screen mesh, and the ring-shaped pipe is provided with a nozzle for spraying nitrogen gas to the surface of the screen mesh;

[0011] The sieve bottom blowing assembly comprises a blowing pipe arranged below the sieve screen, and the blowing pipe is provided with blowing holes vertically facing the back of the sieve screen.

[0012] Further, the annular nitrogen curtain assembly comprises a first annular pipe and a second annular pipe arranged from top to bottom; the first annular pipe is arranged close to the inner wall of the feed inlet and is provided with a plurality of first nozzles arranged in a circumferential array thereon; the second annular pipe is arranged above the sieve screen close to the inner wall of the sieve box and is provided with a plurality of second nozzles arranged in a circumferential array thereon, the spraying direction of the second nozzles is along the tangent direction of the inner wall of the sieve box and is parallel to the plane of the sieve screen.

[0013] Further, the first nozzles are fan-shaped nozzles, the spraying direction of which is inclined to the center of the sieve screen and forms an acute angle with the vertical direction.

[0014] Further, the blowing pipe is a third annular pipe arranged close to the inner wall of the sieve box, and the blowing holes are a plurality of spray holes arranged on the top of the third annular pipe and arranged in a circumferential array thereon.

[0015] Further, the bottom of the sieve box is connected with the base through a plurality of vibration isolation springs.

[0016] Further, the liquid nitrogen supply system further comprises a control unit, and the connecting pipeline is provided with an electromagnetic valve controlled by the control unit.

[0017] Further, the second nozzles are straight-shooting nozzles.

[0018] Compared with the prior art, the utility model has the advantages that:

[0019] Compared with the prior art, the utility model forms full-dimensional nitrogen sealing protection for the sieve screen through the annular nitrogen curtain assembly and the sieve bottom blowing assembly of the liquid nitrogen supply system, and the core advantage is that: the contact between external air and the low-temperature sieve screen can be effectively isolated, the condensation and icing of water vapor on the surface of the sieve screen can be significantly reduced, the cleanliness of the sieve screen and the stability of the subsequent deburring effect can be ensured, the annular nitrogen curtain assembly and the sieve bottom blowing assembly work together to realize the comprehensive coverage of the upper, lower and edge areas of the sieve screen, the nitrogen sealing is more complete, and the anti-condensation effect is better than that of the local sealing structure, the nitrogen gas flowing in the nitrogen sealing process can also assist in carrying away the small burrs remaining on the surface of the sieve screen and in the sieve holes, the sieve screen can be reduced to block, and the equipment maintenance frequency can be reduced, and the design of the additional structures such as the multilayer annular pipe, the control unit and the vibration isolation spring further optimizes the nitrogen sealing efficiency, the operation convenience and the equipment operation stability, so that the overall device can adapt to different production environments and workpiece specifications, and the comprehensive benefits of the frozen deburring process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the cryogenic deburring vibrating screen with nitrogen sealing protection proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the first annular tube in the nitrogen-sealed vibrating screen for deburring and removing flash proposed in this utility model.

[0022] Figure 3 This is a schematic diagram of the second annular tube in the nitrogen-sealed frozen deburring vibrating screen proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the third annular tube in the nitrogen-sealed, deburring vibrating screen proposed in this utility model.

[0024] In the diagram: 1-screen box, 101-feed inlet, 102-discharge outlet, 2-first annular pipe, 3-first nozzle, 4-second annular pipe, 5-second nozzle, 6-screen, 7-third annular pipe, 8-spray hole, 9-vibration motor, 10-vibration isolation spring, 11-base, 12-connecting pipe. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1-4 As shown, this embodiment provides a frozen deburring vibrating screen with nitrogen sealing protection, comprising:

[0027] The screen box 1 has a feed inlet 101 on the top, a discharge outlet 102 on the side wall, and a screen 6 inside.

[0028] A vibration drive device is fixedly installed at the bottom of the screen box 1;

[0029] The liquid nitrogen supply system includes a liquid nitrogen supply source and an annular nitrogen curtain assembly and a sieve bottom purging assembly connected to the liquid nitrogen supply source via a connecting pipe 12;

[0030] The annular nitrogen curtain assembly includes at least one annular tube disposed above the screen 6, and the annular tube is provided with a nozzle for spraying nitrogen onto the surface of the screen 6.

[0031] The bottom sieve blowing assembly includes a blowing pipe disposed below the sieve 6, and the blowing pipe is provided with blowing holes that are vertically oriented toward the back of the sieve 6.

[0032] Overall, the top of the screen box 1 is provided with a feed inlet 101, the lower part of the side wall is provided with a discharge outlet 102, and a screen 6 is horizontally installed inside (the screen hole size is adapted to the size of the workpiece); the vibration driving device adopts a vibration motor 9, which is fixed to the center position of the bottom of the screen box 1 to provide vibration power for the screen 6; the liquid nitrogen supply system includes a nitrogen storage tank (a liquid nitrogen supply source), a connecting pipeline 12, and a ring-shaped nitrogen curtain assembly and a screen bottom blowing assembly; the ring-shaped nitrogen curtain assembly includes a ring-shaped pipe fixed above the screen 6, the inner diameter of the ring-shaped pipe is adapted to the diameter of the screen 6, a plurality of nozzles are uniformly arranged on the pipe body, the nozzles are directed towards the surface of the screen 6, and the jet direction forms an angle of 30° with the plane of the screen 6; the screen bottom blowing assembly includes a linear blowing pipe installed below the screen 6 along the width direction of the screen box 1, a plurality of blowing holes are arranged on the top of the pipe body, and the blowing holes are vertically directed towards the back of the screen 6.

[0033] Before the device is started, the valve of the liquid nitrogen storage tank is opened, nitrogen enters the ring-shaped nitrogen curtain assembly and the screen bottom blowing assembly through the connecting pipeline 12, and a nitrogen sealed atmosphere is formed; the vibration driving device is started, and at the same time, the workpieces to be processed are put in through the feed inlet 101, and the liquid nitrogen is used to cool the workpieces and the screen 6 synchronously to make the flash brittle; during the vibration process of the screen 6, the brittle flash falls off, the workpieces are discharged through the discharge outlet 102, and the nitrogen continues to be sprayed to isolate the external air from entering the screen box 1; after the device is stopped, the nitrogen sealing supply is maintained for 5-10 minutes, and then the temperature of the screen 6 rises to close to room temperature, and finally the liquid nitrogen valve is closed.

[0034] While realizing the basic nitrogen sealing function, the device can also effectively prevent the screen 6 from icing and ensure the efficiency of the flash removal; the structure is simple, the manufacturing cost is low, and it is suitable for small and medium-sized production scenes.

[0035] As shown in Figures 1-3 In the embodiment, the ring-shaped nitrogen curtain assembly includes a first ring-shaped pipe 2 and a second ring-shaped pipe 4 arranged from top to bottom; the first ring-shaped pipe 2 is arranged close to the inner wall of the feed inlet 101, and a plurality of first nozzles 3 are arranged on the inner side of the first ring-shaped pipe 2 in a circumferential array; the second ring-shaped pipe 4 is arranged above the screen 6 close to the inner wall of the screen box 1, and a plurality of second nozzles 5 are arranged on the inner side of the second ring-shaped pipe 4 in a circumferential array, the jet direction of the second nozzles 5 is along the tangent direction of the inner wall of the screen box 1, and is parallel to the plane of the screen 6.

[0036] Specifically, the annular nitrogen curtain assembly is optimized as two annular pipes: the first annular pipe 2 is fixed close to the inner wall of the feed inlet 101, the inner diameter is consistent with the inner diameter of the feed inlet 101, and a plurality of first nozzles 3 are uniformly arranged on the inner side and arranged in a circumferential array; the second annular pipe 4 is fixed above the screen 6 by a support (i.e., the second nozzle 5 is higher than the upper surface of the screen 6), and the height is lower than the thickness of the uppermost layer of material during equipment operation; the second annular pipe 4 is arranged close to the inner wall of the screen box 1, the inner diameter is adapted to the inner diameter of the screen box 1, a plurality of second nozzles 5 are uniformly arranged on the inner side, the jet direction is along the tangent direction of the inner wall of the screen box 1, and is parallel to the plane of the screen 6.

[0037] After the nitrogen enters the two annular pipes, the nozzles of the first annular pipe 2 form a "top sealing ring" to block the air from entering the feed inlet 101; the second annular pipe 4 is set at a height interval of "higher than the screen 6 and lower than the thickness of the material layer", and the tangential jet nitrogen can directly penetrate the material surface layer to form an annular air curtain between the material and the inner wall of the screen box 1, which not only avoids the direct escape of nitrogen from above the material, but also allows the airflow to circulate in the material gap, prolonging the contact time between nitrogen and material; at the same time, the tangential airflow can make the material rotate slightly along the inner wall of the screen box 1, avoiding local accumulation, so that the brittle flash is more easily removed in vibration.

[0038] The two annular pipes cooperatively form a three-dimensional nitrogen seal, especially the height design of the second nozzle 5, which allows the nitrogen to directly act on the material layer, making the sealing of the feed inlet 101 and the screen 6 area more airtight; the anti-condensation effect is improved; the tangential airflow cooperates with the height design to uniformly distribute the material, avoiding accumulation, while enhancing the heat exchange between the nitrogen and the material, making the brittle flash more uniform, and improving the efficiency of removing the flash; the second nozzle 5 is higher than the surface of the screen 6, avoiding direct contact with the vibrating screen 6, reducing the risk of nozzle wear and blockage, and prolonging the service life of the component.

[0039] As shown in Figure 2 In the present embodiment, the first nozzle 3 is a fan-shaped nozzle, and the jet direction is inclined to the center of the screen 6 and forms an acute angle with the vertical direction.

[0040] Specifically, the first nozzle 3 is replaced by a fan-shaped nozzle, the jet angle is 60°, the jet direction is inclined to the center of the screen 6, and forms an acute angle of 20° with the vertical direction.

[0041] The fan-shaped nozzle of the first annular pipe 2 forms a fan-shaped airflow, covering the area from below the feed inlet 101 to the center of the screen 6, and forms an overlapping area with the tangential airflow of the second annular pipe 4, further reducing the residual dead angle of air.

[0042] The fan-shaped nozzle expands the coverage range of nitrogen, and the feed inlet 101 area is sealed without dead angle; the jet direction inclined to the center can assist in guiding the workpiece to spread to the edge of the screen 6, avoiding accumulation in the center, and improving the uniformity of removing the flash.

[0043] AsFigure 1 and Figure 4 As shown, in this embodiment, the purge pipe is a third annular pipe 7 installed close to the inner wall of the screen box 1, and the purge holes are a plurality of spray holes 8 provided on the top of the third annular pipe 7, and the spray holes 8 are arranged in a circumferential array about the third annular pipe 7.

[0044] Specifically, the blowing pipe of the bottom blowing assembly is replaced with a third annular pipe 7, which is installed close to the inner wall of the screen box 1. Its inner diameter is the same as that of the screen 6, and multiple spray holes 8 are evenly opened on the top.

[0045] During the bottom sieve cleaning, the nozzles 8 of the third annular pipe 7 form an annular cleaning airflow that evenly covers the back of the screen 6. This not only prevents air from entering from below, but also blows away the small burrs remaining on the back of the screen 6, preventing the screen holes from becoming clogged.

[0046] The annular purge holes ensure more uniform nitrogen distribution and better anti-condensation effect on the back of screen 6; they effectively clean residual burrs on the back of screen 6, reducing screen hole clogging and extending the service life of screen 6.

[0047] like Figure 1 As shown, in this embodiment, the bottom of the sieve box 1 is connected to the base 11 by a plurality of vibration isolation springs 10.

[0048] Specifically, the bottom of the screen box 1 is connected to the base 11 by four vibration isolation springs 10. The vibration isolation springs 10 are evenly distributed at the four corners of the bottom of the screen box 1, and the spring stiffness is adapted to the weight of the screen box 1.

[0049] When the vibration drive device is working, the vibration isolation spring 10 absorbs the vibration energy and reduces the transmission of the vibration of the screen box 1 to the base 11 and the ground; after the machine stops, the spring returns to its original position, the screen box 1 remains stable, and the nitrogen sealing airflow is more stable.

[0050] By setting the vibration isolation spring 10, the vibration noise during equipment operation is reduced; the impact of vibration on the liquid nitrogen connection pipe 12 is reduced, the risk of pipe leakage is reduced, and the safety of equipment operation is improved.

[0051] like Figure 1 As shown, in this embodiment, the liquid nitrogen supply system further includes a control unit, and the connecting pipe 12 is equipped with a solenoid valve controlled by the control unit.

[0052] Specifically, a control unit (PLC controller) is added to the liquid nitrogen supply system, a solenoid valve (electrically connected to the control unit) is installed on the connecting pipe 12, and a temperature sensor is installed inside the screen box 1 (to monitor the temperature of the screen 6 in real time).

[0053] The control unit presets a temperature threshold (e.g., nitrogen sealing starts at -50℃ and stops at 20℃); when the temperature sensor detects that the temperature of screen 6 is below -50℃, the control unit controls the solenoid valve to open and automatically supply nitrogen; after the equipment stops, when the temperature sensor detects that the temperature of screen 6 rises back to 20℃, the solenoid valve automatically closes and stops nitrogen sealing.

[0054] By setting up the control unit, the nitrogen sealing can be automatically started and stopped without manual operation, saving liquid nitrogen consumption; the temperature is precisely controlled to avoid insufficient or excessive nitrogen supply, thus improving the ease of operation.

[0055] like Figure 3 As shown, in this embodiment, the second nozzle 5 is a direct-fire nozzle.

[0056] Specifically, the second nozzle 5 is replaced with a direct-fire nozzle, and the height of the second annular tube 4 remains "higher than the upper surface of the screen 6 and lower than the thickness of the uppermost material layer".

[0057] The direct-fire nozzle of the second annular pipe 4, due to its high pressure, sprays nitrogen gas in the range of "above the screen 6 and below the material layer" to form a high-intensity airflow jet. After penetrating the surface of the material, it flows rapidly along the tangential direction of the inner wall of the screen box 1. On the one hand, the airflow forms an "air wall" between the material and the inner wall of the screen box 1, completely blocking external air from seeping in from the side wall gaps. On the other hand, the high-speed airflow drives the material particles to collide with each other, assisting in the detachment of brittle flash, while blowing the small flash towards the edge of the screen 6, reducing screen hole blockage.

[0058] The high-intensity airflow of the direct-fire nozzle, combined with a height design "below the material layer thickness," further improves nitrogen utilization; it maintains stable nitrogen sealing even in high humidity environments, further reducing the icing rate of screen 6; the flow enhances the relative movement between materials as it penetrates the material layer, and with the effect of vibration, the flash removal rate is improved; the flash removal qualification rate is further improved; the design "above the surface of screen 6" avoids vibration interference between the nozzle and screen 6, ensuring stable spray direction and further reducing equipment failure rate.

[0059] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0060] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

[0061] The technical, shape and structure parts not described in detail in the utility model are well-known technologies.

Claims

1. A freeze deburring shaker with nitrogen seal protection, characterized in that, The application relates to a liquid nitrogen supply system for a vibrating screen. The vibrating screen comprises a screen box (1) with a feed inlet (101) on the top and a discharge outlet (102) on the side wall, and a screen mesh (6) arranged inside; a vibrating drive device fixedly installed at the bottom of the screen box (1); and a liquid nitrogen supply system comprising a liquid nitrogen supply source and a ring-shaped nitrogen curtain assembly and a screen bottom purging assembly in communication with the liquid nitrogen supply source through a connecting pipeline (12). The ring-shaped nitrogen curtain assembly comprises at least one ring-shaped pipe arranged above the screen mesh (6), and the ring-shaped pipe is provided with nozzles for spraying nitrogen towards the surface of the screen mesh (6). The screen bottom purging assembly comprises a purging pipe arranged below the screen mesh (6), and the purging pipe is provided with purging holes vertically facing the back surface of the screen mesh (6). The ring-shaped nitrogen curtain assembly comprises a first ring-shaped pipe (2) and a second ring-shaped pipe (4) arranged from top to bottom; the first ring-shaped pipe (2) is arranged close to the inner wall of the feed inlet (101) and is provided with a plurality of first nozzles (3) arranged in a circumferential array thereon; the second ring-shaped pipe (4) is arranged above the screen mesh (6) close to the inner wall of the screen box (1) and is provided with a plurality of second nozzles (5) arranged in a circumferential array thereon, the spraying direction of the second nozzles (5) is along the tangent direction of the inner wall of the screen box (1) and is parallel to the plane of the screen mesh (6). The first nozzles (3) are fan-shaped nozzles, the spraying direction of which is inclined towards the center of the screen mesh (6) and forms an acute angle with the vertical direction.

2. The nitrogen sealed, freeze deburring shaker of claim 1, wherein, The purging pipe is a third ring-shaped pipe (7) arranged close to the inner wall of the screen box (1), and the purging holes are a plurality of spray holes (8) arranged on the top of the third ring-shaped pipe (7), the spray holes (8) are arranged in a circumferential array on the third ring-shaped pipe (7).

3. The nitrogen sealed, freeze deburring shaker of claim 2, wherein, The bottom of the screen box (1) is connected with a base (11) through a plurality of vibration isolation springs (10).

4. The nitrogen sealed, freeze-ejector shaker out according to claim 1, wherein, The liquid nitrogen supply system further comprises a control unit, and the connecting pipeline (12) is provided with an electromagnetic valve controlled by the control unit.

5. The nitrogen sealed, freeze-ejector shaker out of claim 1, wherein, The second nozzles (5) are straight-type nozzles.

6. The nitrogen sealed, freeze-ejector shaker out of claim 1, wherein, ​ 7. The freeze de-burring shaker with nitrogen seal protection of claim 2 or 3, wherein, ​

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