Double-layer air-blowing vibrating screen with adjustable screen holes

Abstract

According to the vibrating screen, a first-layer screening mechanism and a second-layer screening mechanism are installed on the top and the upper portion of a rack in parallel up and down, each of the first-layer screening mechanism and the second-layer screening mechanism comprises a screen frame, an upper screen, a lower screen and an adjusting assembly, a sliding groove is formed in the middle of each screen frame, and the screen frames are installed on the rack; the upper screen is fixed at the upper end of the screen frame; the lower screen is installed in the sliding groove. The adjusting assembly comprises a driving motor, a lead screw and a moving nut. The driving motor drives the moving nut through the lead screw to drive the lower screen to move relative to the upper screen. The first blowing mechanism and the second blowing mechanism are the same in structure and are arranged below the first-layer screening mechanism and the second-layer screening mechanism respectively, and a plurality of air nozzles are evenly arranged on the portions, corresponding to the screening nets, of the screening mechanisms. According to the vibrating screen, the size of the screening hole diameter can be flexibly adjusted according to needs, and the screening requirements of materials with various particle sizes can be met through one vibrating screen.

Description

Technical Field

[0001] The utility model belongs to the technical field of ore screening, in particular to a double-layer air-blowing vibrating screen with adjustable screen holes. Background Art

[0002] The demand for sand and gravel in the Chinese market is growing continuously, and the proportion of machine-made sand in the total supply of sand and gravel is increasing year by year, which puts higher requirements on the production process of machine-made sand. In different sand making processes, the vibrating screen plays a key role. It is usually arranged in the process before feeding and after discharging of the sand making machine. Its screening effect and work efficiency will have a very important impact on the entire sand making process.

[0003] Vibration screening equipment is a widely used mechanical equipment in the ore mining and processing industry. The working principle of the traditional structure is that the motor drives the exciter to generate exciting force, so that the screen surface vibrates, and then the material moves with the screen surface, and finally achieves the purpose of screening. In this structure, the friction between the material and the screen is relatively frequent, resulting in serious loss of the screen. When the screen is worn, it will seriously affect the screening effect. Workers are required to check the screen regularly and replace it in time after the wear is found. This brings a large labor load to the workers and also brings certain safety risks to the workers. In addition, there are different screening size requirements when screening different materials. When sand and gravel of various particle sizes are required, either multiple vibrating screens are required to work together, or the screen needs to be replaced multiple times. Working with multiple vibrating screens will not only increase production costs, but also increase floor space. Replacing the screen multiple times will seriously reduce the screening efficiency and bring a large workload to the workers. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a double-layer air-blown vibrating screen with adjustable screen holes. The vibrating screen can flexibly adjust the size of the screening aperture according to needs, and can meet the screening needs of materials of various particle sizes through one vibrating screen. At the same time, the vibrating screen can effectively reduce the wear rate of the screen, which is beneficial to increase the service life of the screen, thereby reducing the labor load of workers and saving production costs. At the same time, it can effectively ensure the screening efficiency.

[0005] In order to achieve the above object, the utility model provides a double-layer air-blowing vibrating screen with adjustable screen holes, comprising a frame, a first-layer screening mechanism, a second-layer screening mechanism, a first air-blowing mechanism and a second air-blowing mechanism;

[0006] The first layer screening mechanism and the second layer screening mechanism are installed in parallel on the top and upper part of the frame; the first layer screening mechanism and the second layer screening mechanism have the same structure, both of which include a screen frame, an upper screen, a lower screen and an adjusting assembly, the middle part of the screen frame is provided with a slide groove extending along its width direction, and the screen frame is fixedly installed on the frame; the upper screen is fixedly connected to the upper end of the screen frame; the lower screen is slidably installed in the slide groove of the screen frame and is arranged in parallel with the upper screen, and at the same time, the lower screen is in sliding contact with the upper screen; the adjusting assembly includes a driving motor, a screw rod and a moving nut; the length direction of the screw rod extends along the width direction of the screen frame, and is rotatably arranged below the screen frame through two bearing seats installed at the lower end of the screen frame; the driving motor is installed at the lower end of the screen frame, and its output shaft is connected to one end of the screw rod; the moving nut is installed on the screw rod through threaded cooperation, and its upper end is fixedly connected to the lower screen;

[0007] The first blowing mechanism and the second blowing mechanism have the same structure. The first blowing mechanism is installed below the first layer of screening mechanism, and a plurality of first air nozzles are evenly arranged on the part corresponding to the screen in the first layer of screening mechanism; the second blowing mechanism is installed below the second layer of screening mechanism, and a plurality of second air nozzles are evenly arranged on the part corresponding to the screen in the second layer of screening mechanism.

[0008] Furthermore, in order to facilitate the transportation of the screened materials to the outside, it also includes a first-layer material slide plate and a second-layer material slide plate. The first-layer material slide plate is installed obliquely on one side of the frame, and its high-end feed port is connected to the discharge port of the first-layer screening mechanism. The second-layer material slide plate is installed obliquely on one side of the frame, and its high-end feed port is connected to the discharge port of the second-layer screening mechanism.

[0009] Furthermore, in order to facilitate assembly and disengagement operations, the upper screen is fixedly connected to the upper end of the screen frame by bolts.

[0010] Furthermore, in order to ensure that the lower screen only moves in the width direction relative to the upper screen and does not move relative to the length direction, the slide groove is in a horizontally inverted I-shape.

[0011] As a preference, the upper sieve and the lower sieve are sieves of the same specification.

[0012] Furthermore, in order to facilitate maintenance of the screen frame and replacement of worn screens, both ends of the screen frames in the first and second screening mechanisms are connected to the frame via pins.

[0013] In the utility model, a first blowing mechanism is installed below the first layer of screening mechanism, and the first blowing mechanism is evenly provided with a plurality of first air nozzles at a portion corresponding to the screen in the first layer of screening mechanism. At the same time, a second blowing mechanism is installed below the second layer of screening mechanism, and the second blowing mechanism is evenly provided with a plurality of second air nozzles at a portion corresponding to the screen in the second layer of screening mechanism. This can facilitate the vibration of materials above the first screening mechanism and the second screening mechanism by controlling the blowing frequency and air pressure of the blowing mechanism, thereby achieving a screening effect on the materials. This method does not require applying excitation to the screen, and at the same time, reduces the probability of friction between the material and the screen, can effectively reduce the wear rate of the screen, and is beneficial to extending the service life of the screen. The first and second screening mechanisms are both provided with a screen frame with a slide groove in the middle, and the upper screen is installed at the upper end of the screen frame, and the lower screen is installed in the slide groove, so that the lower screen can slide in the width direction relative to the upper screen. In this way, when the lower screen and the upper screen are in sliding contact and cooperation, the screening aperture can be adjusted by the offset movement and cooperation between the two layers of screens, thereby realizing convenient adjustment of the screening aperture without replacing the screen, and the size of the screened particles can be adjusted according to actual needs; at the same time, since the lower screen can move laterally relative to the upper screen, the blockage can be stirred by sliding, and the blocked screen hole area can be conveniently dredged. Therefore, the vibrating screen does not need to be stopped for manual cleaning when blocked, thereby ensuring production efficiency and improving the safety factor during operation.

[0014] The vibrating screen can flexibly adjust the size of the screening aperture according to needs, and can meet the screening needs of materials of various particle sizes through one vibrating screen. At the same time, the vibrating screen can effectively reduce the wear rate of the screen, which is beneficial to increase the service life of the screen, thereby reducing the labor burden of workers and saving production costs. At the same time, it can effectively ensure the screening efficiency; furthermore, when blockage occurs, the blocking area can be easily cleared by controlling the drive motor, which further reduces the labor burden of workers and improves the safety factor of workers during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the assembly between the screen frame, the upper screen and the lower screen in the utility model;

[0017] Figure 3 It is a schematic diagram of the adjustment process of the sieve holes between the upper sieve and the lower sieve in the utility model;

[0018] Figure 4 It is a schematic diagram of the arrangement of the first air blowing mechanism and the second air blowing mechanism in the utility model.

[0019] Figure: 1. First-layer screening mechanism, 2. Second-layer screening mechanism, 3. First air blowing mechanism, 4. Frame, 5. First-layer material sliding plate, 6. Second-layer material sliding plate, 10. Screen frame, 11. Lower screen, 12. Upper screen, 13. Moving nut, 14. Screw, 15. Driving motor, 16. Second air blowing mechanism. DETAILED DESCRIPTION

[0020] The utility model will be further described below in conjunction with the accompanying drawings.

[0021] like Figures 1 to 4 As shown, the utility model provides a double-layer air-blowing vibrating screen with adjustable sieve holes, comprising a frame 4, a first-layer screening mechanism 1, a second-layer screening mechanism 2, a first blowing mechanism 3 and a second blowing mechanism 16;

[0022] The first layer screening mechanism 1 and the second layer screening mechanism 2 are installed in parallel on the top and upper part of the frame 4; the first layer screening mechanism 1 and the second layer screening mechanism 2 have the same structure, and both include a screen frame 10, an upper screen 12, a lower screen 11 and an adjustment component, the middle part of the screen frame 10 is provided with a slide groove extending along its width direction, and the screen frame 10 is fixedly installed on the frame 4; the upper screen 12 is fixedly connected to the upper end of the screen frame 10; the lower screen 11 is slidably installed in the slide groove of the screen frame 10, and is arranged parallel to the upper screen 12. At the same time, the lower screen 11 and the upper screen 12 are in sliding contact with each other; the adjustment assembly includes a driving motor 15, a screw rod 14 and a movable nut 13; the length direction of the screw rod 14 extends along the width direction of the screen frame 10, and is rotatably arranged below the screen frame 10 through two bearing seats installed at the lower end of the screen frame 10; the driving motor 15 is installed at the lower end of the screen frame 10, and its output shaft is connected to one end of the screw rod 14; the movable nut 13 is installed on the screw rod 14 through threaded cooperation, and its upper end is fixedly connected to the lower screen 11;

[0023] The first blowing mechanism 3 and the second blowing mechanism 16 have the same structure. The first blowing mechanism 3 is installed below the first-layer screening mechanism 1, and a plurality of first air nozzles are evenly arranged on the part corresponding to the screen in the first-layer screening mechanism 1; the second blowing mechanism 16 is installed below the second-layer screening mechanism 2, and a plurality of second air nozzles are evenly arranged on the part corresponding to the screen in the second-layer screening mechanism 2.

[0024] As a preferred embodiment, the main bodies of the first blowing mechanism 3 and the second blowing mechanism 16 are both fixedly mounted on the frame 4 .

[0025] In order to facilitate the external transportation of the screened materials, a first-layer slide plate 5 and a second-layer slide plate 6 are also included. The first-layer slide plate 5 is installed obliquely on one side of the frame 4, and its high-end feed port is connected to the discharge port of the first-layer screening mechanism 1. The second-layer slide plate 6 is installed obliquely on one side of the frame 4, and its high-end feed port is connected to the discharge port of the second-layer screening mechanism 2.

[0026] In order to facilitate assembly and disassembly operations, the upper screen 12 is fixedly connected to the upper end of the screen frame 10 by bolts.

[0027] In order to ensure that the lower screen only moves in the width direction relative to the upper screen and does not move relatively in the length direction, the slide groove is in a horizontally inverted I-shape.

[0028] As a preference, the upper sieve 12 and the lower sieve 11 are sieves of the same specification.

[0029] In order to facilitate the maintenance of the screen frame and the replacement of the worn screen, both ends of the screen frame 10 in the first screening mechanism 1 and the second screening mechanism 2 are connected to the frame 4 through pins.

[0030] In the utility model, a first blowing mechanism is installed below the first layer of screening mechanism, and the first blowing mechanism is evenly provided with a plurality of first air nozzles at a portion corresponding to the screen in the first layer of screening mechanism. At the same time, a second blowing mechanism is installed below the second layer of screening mechanism, and the second blowing mechanism is evenly provided with a plurality of second air nozzles at a portion corresponding to the screen in the second layer of screening mechanism. This can facilitate the vibration of materials above the first screening mechanism and the second screening mechanism by controlling the blowing frequency and air pressure of the blowing mechanism, thereby achieving a screening effect on the materials. This method does not require applying excitation to the screen, and at the same time, reduces the probability of friction between the material and the screen, can effectively reduce the wear rate of the screen, and is beneficial to extending the service life of the screen. The first and second screening mechanisms are both provided with a screen frame with a slide groove in the middle, and the upper screen is installed at the upper end of the screen frame, and the lower screen is installed in the slide groove, so that the lower screen can slide in the width direction relative to the upper screen. In this way, when the lower screen and the upper screen are in sliding contact and cooperation, the screening aperture can be adjusted by the offset movement and cooperation between the two layers of screens, thereby realizing convenient adjustment of the screening aperture without replacing the screen, and the size of the screened particles can be adjusted according to actual needs; at the same time, since the lower screen can move laterally relative to the upper screen, the blockage can be stirred by sliding, and the blocked screen hole area can be conveniently dredged. Therefore, the vibrating screen does not need to be stopped for manual cleaning when blocked, thereby ensuring production efficiency and improving the safety factor during operation.

[0031] The vibrating screen can flexibly adjust the size of the screening aperture according to needs, and can meet the screening needs of materials of various particle sizes through one vibrating screen. At the same time, the vibrating screen can effectively reduce the wear rate of the screen, which is beneficial to increase the service life of the screen, thereby reducing the labor burden of workers and saving production costs. At the same time, it can effectively ensure the screening efficiency; furthermore, when blockage occurs, the blocking area can be easily cleared by controlling the drive motor, which further reduces the labor burden of workers and improves the safety factor of workers during operation.

[0032] The use process of a double-layer air-blown vibrating screen with adjustable sieve holes in the utility model is as follows:

[0033] Step 1: Add the material to be screened onto the upper screen 12 in the first-layer screening mechanism 1;

[0034] Step 2: When it is necessary to screen out two kinds of sand and gravel with different particle sizes, first control the movement of the adjustment components in the first screening mechanism 1 and the second screening mechanism 2 respectively, use the driving motor 15 to drive the screw 14 to rotate, and then drive the moving nut 13 to drive the lower screen 11 to move a set distance along the length direction of the screw 14, so that the position of the sieve holes on the lower screen 11 in the same screening mechanism changes relative to the sieve holes on the upper screen 12, until the screening aperture of the first screening mechanism 1 and the screening aperture of the second screening mechanism 2 meet the required requirements, and ensure that the screening aperture of the first screening mechanism 1 is larger than the screening aperture of the second screening mechanism 2; then supply a high-pressure air source to the first blowing mechanism 3 and the second blowing mechanism 16, and use the first blowing mechanism 3 to spray the first screening mechanism 1 with a plurality of first air nozzles. The gas vibrates the material on the first-layer screening mechanism 1, thereby realizing the primary screening of the material, wherein the large-particle waste material rolls down along the upper surface of the upper screen 12 in the first-layer screening mechanism 1 to the first-layer material slide plate 5, and is output to the outside by the first-layer material slide plate 5, and the medium-particle and small-particle sand and gravel pass through the first-layer screening mechanism 1 and fall onto the upper screen 12 in the second-layer screening mechanism 2, and the gas is simultaneously sprayed to the second-layer screening mechanism 2 by a plurality of second air nozzles on the second blowing mechanism 16, thereby vibrating the material on the second-layer screening mechanism 2, thereby realizing the secondary screening of the material, wherein the medium-particle sand and gravel rolls down along the upper surface of the upper screen 12 in the second-layer screening mechanism 2 to the second-layer material slide plate 6, and is output to the outside by the second-layer material slide plate 6, and the small-particle sand and gravel pass through the second-layer screening mechanism 2 and fall;

[0035] When only one particle size of sand and gravel needs to be screened out, the adjustment components in the first screening mechanism 1 and the second screening mechanism 2 are controlled to move respectively, and the driving motor 15 is used to drive the screw 14 to rotate, and then the moving nut 13 is driven to drive the lower screen 11 to move a set distance along the length direction of the screw 14, so that the position of the sieve holes on the lower screen 11 in the same screening mechanism is changed relative to the sieve holes on the upper screen 12, until the screening aperture of the first screening mechanism 1 meets the required requirements, and at the same time, it is ensured that the screening aperture of the second screening mechanism 2 is larger than the screening aperture of the first screening mechanism 1; then a high-pressure air source is supplied to the first blowing mechanism 3 and the second blowing mechanism 16, and the first blowing mechanism 16 is used to blow the first air nut 13. A plurality of first air nozzles on the structure 3 spray gas toward the first-layer screening mechanism 1, so that the material on the first-layer screening mechanism 1 vibrates, thereby realizing primary screening of the material, wherein large particles of waste material roll along the upper surface of the upper screen 12 in the first-layer screening mechanism 1 to a layer of material chute plate 5, and are output to the outside by the layer of material chute plate 5, and sand and gravel of the required particle size passes through the first-layer screening mechanism 1 and falls onto the upper screen 12 in the second-layer screening mechanism 2, and simultaneously, a plurality of second air nozzles on the second blowing mechanism 16 spray gas toward the second-layer screening mechanism 2, so that the material on the second-layer screening mechanism 2 vibrates, and sand and gravel of the required particle size passes through the second-layer screening mechanism 2 and falls. As an alternative, when the apertures of the upper screen 12 and the lower screen 11 are both small and comparable to the fineness of the metal wire of the screen, when only one particle size of sand and gravel needs to be screened out, the sieve holes between the upper screen 12 and the lower screen 11 in the second screening mechanism 2 can be completely misaligned, so that the sieve holes of the upper screen 12 can be completely closed by the lower screen 11, so that particles of the required size can be directly rolled from the upper surface of the upper screen 12 in the second screening mechanism 2 to the second-layer material slide plate 6, and output to the outside through the second-layer material slide plate 6;

[0036] When the first-layer screening mechanism 1 or the second-layer screening mechanism 2 is clogged with materials, a containing and collecting device is placed under the corresponding screen, and then the corresponding adjusting component is controlled to move, and the driving motor 15 is used to drive the screw rod 14 to rotate, thereby driving the moving nut 13 to drive the lower screen 11 to move a set distance along the length direction of the screw rod 14, so that the position of the sieve holes on the lower screen 11 changes relative to the sieve holes on the upper screen 12, and the blockage is stirred by the relative movement between the upper screen 12 and the lower screen 11 until the blockage falls and falls into the containing and collecting device, and then the containing and collecting device is removed, and then the corresponding adjusting component is controlled to move, so that the screening aperture returns to the previous state, and the screening operation continues.

[0037] Through the above-mentioned use process, the utility model can meet the screening needs of materials with one particle size or two particle sizes through one vibrating screen. At the same time, when blockage occurs, the dredging operation can be quickly completed by simply adjusting the driving motor, thereby effectively ensuring the screening efficiency and significantly improving the versatility of a single vibrating screen.

Claims

1. A double-layer air-blown vibrating screen with adjustable screen holes, comprising a frame (4), a first-layer screening mechanism (1) and a second-layer screening mechanism (2), characterized in that: It also includes a first air blowing mechanism (3) and a second air blowing mechanism (16); The first-layer screening mechanism (1) and the second-layer screening mechanism (2) are installed in parallel on the top and upper part of the frame (4); the first-layer screening mechanism (1) and the second-layer screening mechanism (2) have the same structure, and both include a screen frame (10), an upper screen (12), a lower screen (11) and an adjustment component; a slide groove extending along the width direction of the screen frame (10) is provided in the middle part of the screen frame (10); the screen frame (10) is fixedly installed on the frame (4); the upper screen (12) is fixedly connected to the upper end of the screen frame (10); the lower screen (11) is slidably installed in the slide groove of the screen frame (10) and is parallel to the upper screen (12). The adjusting assembly comprises a driving motor (15), a screw rod (14) and a movable nut (13); the length direction of the screw rod (14) extends along the width direction of the screen frame (10), and is rotatably arranged below the screen frame (10) through two bearing seats installed at the lower end of the screen frame (10); the driving motor (15) is installed at the lower end of the screen frame (10), and its output shaft is connected to one end of the screw rod (14); the movable nut (13) is installed on the screw rod (14) through threaded cooperation, and its upper end is fixedly connected to the lower screen (11); The first blowing mechanism (3) and the second blowing mechanism (16) have the same structure. The first blowing mechanism (3) is installed below the first layer of the screening mechanism (1), and a plurality of first air nozzles are evenly arranged at the portion corresponding to the screen in the first layer of the screening mechanism (1); the second blowing mechanism (16) is installed below the second layer of the screening mechanism (2), and a plurality of second air nozzles are evenly arranged at the portion corresponding to the screen in the second layer of the screening mechanism (2).

2. A double-layer air-blown vibrating screen with adjustable mesh according to claim 1, characterized in that: The invention also comprises a first-layer material sliding plate (5) and a second-layer material sliding plate (6), wherein the first-layer material sliding plate (5) is installed obliquely on one side of the frame (4), and its high-end material feed port is connected to the material discharge port of the first-layer screening mechanism (1), and the second-layer material sliding plate (6) is installed obliquely on one side of the frame (4), and its high-end material feed port is connected to the material discharge port of the second-layer screening mechanism (2).

3. A double-layer air-blown vibrating screen with adjustable mesh according to claim 2, characterized in that: The upper screen (12) is fixedly connected to the upper end of the screen frame (10) by means of bolts.

4. A double-layer air-blown vibrating screen with adjustable mesh according to claim 3, characterized in that: The slide groove is in a horizontally inverted I-shape.

5. A double-layer air-blown vibrating screen with adjustable mesh size according to claim 4, characterized in that: The upper screen (12) and the lower screen (11) are screens of the same specifications.

6. A double-layer air-blown vibrating screen with adjustable mesh according to claim 5, characterized in that: Both ends of the screen frame (10) in the first-layer screening mechanism (1) and the second-layer screening mechanism (2) are connected to the frame (4) via pins.

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