High efficiency combined ore screening machine

Abstract

The invention discloses a high-efficiency combined ore screening machine, comprising a frame, an upper screening device is installed on the frame, a lower screening device is installed on the frame and receives the screened material of the upper screening device below the upper screening device, the upper screening device and the lower screening device are both inclined and have the same inclination direction, the head end of the lower screening device and the head end of the upper screening device are staggered front and back, a material guiding device is inclined between the head end of the upper screening device and the head end of the lower screening device, and a discharging device is respectively arranged at the end of the upper screening device, the end of the lower screening device and the bottom of the lower screening device; the device comprises two screening devices connected up and down, has a compact structure and occupies a small space, and the two screening devices are staggered, so that the effective screening path of the screen becomes longer and the screening effect is better; and the two screening devices vibrate separately, and their respective frequencies are adjustable, so that the screening effect is good, and at the same time, the motor loss is small and the noise is low.

Description

Technical Field

[0001] The invention relates to a screening device, in particular to an ore screening machine. Background Art

[0002] During the processing of the ore production line, the crusher breaks the ore into pieces, and then uses a screening machine to screen it. The screening machine passes the crushed ore through the screen and divides it into several grades according to the particle size of the material, and then proceeds to the next step of processing. The current screening machine usually includes two or three screens. If two layers of screens are set, the material can be screened into three grades. If three layers of screens are set, the material can be screened into four grades. However, since only four grades of screening are still unable to meet the use requirements when screening the ore, the ore usually needs to be screened into at least five grades to achieve a good screening effect.

[0003] In order to achieve this screening effect, at least two independent screening machines are provided in the prior art. Figure 7 After crushing by the crusher, it is transported to the primary screening device through a conveyor belt. After screening, two grades of materials are formed. The remaining ore with smaller particle size is transported to the next screening device (secondary screening device) through a conveyor belt to form three grades of materials, and finally five different grades of materials are formed. Although this method can achieve at least five grades of materials, the screening process still requires conveyor belts for transportation. The conveyor belt occupies a large space, making the entire system layout not compact, and the belt conveying process consumes a lot of energy, resulting in low screening efficiency. Regardless of whether it is a primary screening device or a secondary screening device, the material is transported by the conveyor belt to the distributor above the head end of the vibrating screen and discharged to the vibrating screen. The middle materials that fall on the head end of the first layer of the screen are more and thicker, and the material layers on both sides are less and thinner. The distribution in the width direction is uneven, and the material screening effect is poor, affecting the screening efficiency of each first layer of the screen.

[0004] In order to save the layout space of the site, a screening machine including four screens is set in the prior art. The four screens are arranged in an inclined manner from top to bottom. Although the screening machine can screen five grades of materials at a time, during the screening process, the effective screening path of the lower screen is shorter than that of the upper screen, so that a part of the screens in the screening machine cannot play a screening role, resulting in incomplete screening. For details, see Figure 8 The material on the first layer of screen slides continuously with the screen, and the large particles slide down along the inclined surface of the screen and are discharged from the discharge port to form a grade of material, while the smaller particles will fall onto the second layer of screen after sliding down a certain distance after vibration. In this way, there will be an empty area at the rear end of the second layer of screen, and the screening path of the material falling onto the second layer of screen will be shortened. Figure 8It can be seen that the empty areas at the head ends of the third and fourth screen layers will become larger and larger, especially the fourth screen layer has the smallest available effective screening path, which not only causes waste of screens, but also has a small effective screening path, which will make screening incomplete and fail to fully achieve the screening effect of the screening machine; at the same time, after the material is discharged by the distributor, a lot of material falls on the middle of the head end of the first screen layer, and the distribution in the width direction is uneven, resulting in poor material screening effect. Therefore, a small amount of material will fall from the head end of the first screen layer to the second screen layer, resulting in an empty area at the head end of the second screen layer. The material continues to fall, resulting in empty areas at the head ends of the third and fourth screen layers, causing screening. The screen is wasted; in addition, this type of screening machine usually uses an excitation device, so that the vibration frequency of the four layers of screens is the same, the frequency of material movement is basically the same, and when the material is screened, the screens on the upper and lower layers are used to screen materials of different particle sizes. If the vibration frequency is high, the large-particle material will be broken and continue to enter the next layer of screen for screening, resulting in a low yield of large-particle materials; if the vibration frequency is low, the small-particle material cannot be screened thoroughly, and the large-particle material will be mixed with small-particle materials, so the screening effect cannot be optimized. At the same time, due to the complex structure of the screen, the motor loss of the excitation device is large, the noise is large, the failure rate is high, and the practicality is poor. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high-efficiency combined ore screening machine with reasonable design, small footprint, high screening efficiency, low energy consumption, low noise and good screening effect.

[0006] To solve the above technical problems, the technical solution of the present invention is: a high-efficiency combined ore screening machine, comprising a frame, an upper screening device is installed on the frame, and a lower screening device is installed on the frame and receives the screened material of the upper screening device below the upper screening device, the upper screening device and the lower screening device are both inclined and have the same inclination direction, the head end of the lower screening device and the head end of the upper screening device are staggered front and back, a material guiding device for guiding the screened material at the head end of the upper screening device to the head end of the lower screening device is inclinedly arranged between the head end of the upper screening device and the head end of the lower screening device, and the material is distributed from the entire screening surface of the bottom screen of the upper screening device to the screening surface of the material guiding device and the top screen of the lower screening device; a discharging device is respectively arranged at the end of the upper screening device, the end of the lower screening device, and the bottom of the lower screening device.

[0007] As a preferred technical solution, the upper screening device comprises an upper screen box, at least two layers of upper screens are arranged in the upper screen box, and an upper excitation device is correspondingly arranged on the upper screen box.

[0008] As a preferred technical solution, the lower-level screening device includes a lower-level screen box, at least two layers of lower-level screens are arranged in the lower-level screen box, and a lower-level excitation device is correspondingly arranged on the lower-level screen box.

[0009] As a preferred technical solution, the material guiding device is an inclined material guiding plate, and the two ends of the inclined material guiding plate are respectively connected to the bottom of the head end of the upper screening device and the upper part of the head end of the lower screening device.

[0010] As a preferred technical solution, a screening cover is provided above the upper screening device, between the upper screening device and the lower screening device, and outside the discharging device.

[0011] As a preferred technical solution, the material guiding device is located inside the screening hood.

[0012] As a preferred technical solution, sealing structures are correspondingly provided at the connection points between the screening cover and the upper screening device, the lower screening device, and the discharging device, as well as at the connection point between the discharging device and the lower screening device.

[0013] As a preferred technical solution, the sealing structure is a soft connection seal.

[0014] Due to the adoption of the above technical scheme, the efficient combined ore screening machine comprises a frame, an upper screening device is installed on the frame, and a lower screening device installed on the frame and receiving the screened material of the upper screening device is arranged below the upper screening device, the upper screening device and the lower screening device are both inclinedly arranged and the inclination direction is consistent, the head end of the lower screening device and the head end of the upper screening device are staggered front and back, a material guiding device for guiding the screened material at the head end of the upper screening device to the head end of the lower screening device is inclinedly arranged between the head end of the upper screening device and the head end of the lower screening device, and the material is distributed from the entire screening surface of the bottom screen of the upper screening device to the screening surface of the material guiding device and the top screen of the lower screening device; a discharging device is respectively arranged at the end of the upper screening device, the end of the lower screening device, and the bottom of the lower screening device;

[0015] The beneficial effects of the present invention are:

[0016] (1) Since the device includes two screening devices at the same time, its screening effect is significantly better than that of one screening device. It can not only meet the current multi-stage screening needs for ore, but also, since the upper screening device and the lower screening device are stacked up and down, the structure is compact and occupies a small space. During the screening process of the upper screening device, small particles fall directly onto the lower screening device for the next step of screening. Unlike the prior art, a conveyor belt is no longer required for transfer and transportation between the two-stage screening devices. This not only saves the space occupied by the conveyor belt, but also reduces the transportation energy consumption, improves the screening efficiency, and has a low cost.

[0017] (2) Since the head end of the lower screening device and the head end of the upper screening device are staggered, the role of this staggered part is to compensate for the problem of an empty area at the head end of the screen in the prior art. Even if the material falling from the upper screening device to the lower screening device slides on the upper screening device for a certain distance before falling, since the head end of the lower screening device is staggered forward, the material falls directly to the head end of the lower screening device at this time, and no empty area is formed on the lower screening device. At the same time, even if the material discharged from the head end of the upper screening device is small, the material will be guided to the head end of the lower screening device by the material guiding device, so that the material can fully fall into the head end of the lower screening device, so that the effective screening path on the lower screening device will be fully utilized. Compared with the prior art, the effective screening path of the device is significantly longer, which reduces the waste of screen, so its screening effect is better;

[0018] (3) The screening frequencies of the upper screening device and the lower screening device can be adjusted separately, and the screening frequencies between the two can be adjusted separately as needed. Different frequencies can not only effectively reduce noise, but also different frequencies are used to screen materials of different particle sizes. For example, the frequency of the upper screening device is lowered and the frequency of the lower screening device is increased. Materials with large particles are easy to screen. When passing through the upper screening device, large particles will not be crushed due to the low frequency, thereby improving the yield of large particles. Small particles are not easy to screen. When passing through the lower screening device, they can be screened thoroughly due to the high frequency. By setting different frequencies, different needs can be met and a good screening effect can be achieved. In addition, compared with the prior art that only uses one motor, two motors are used to work separately, and the load of each motor becomes smaller, so the motor loss is smaller and the failure rate is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0020] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0021] Figure 2 is a structural schematic diagram of a sealing structure according to an embodiment of the present invention;

[0022] Figure 3 is a working principle diagram of the first embodiment of the present invention;

[0023] Figure 4 is a structural diagram of Embodiment 2 of the present invention;

[0024] Figure 5 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0025] Figure 6 is a structural diagram of Embodiment 4 of the present invention;

[0026] Figure 7 It is a working principle diagram when two screening machines are used in the background technology;

[0027] Figure 8 It is a structural principle diagram of a screening machine with four layers of screens in the background technology;

[0028] In the figure: 1-upper screening frame; 2-lower screening frame 3-upper screening device; 4-lower screening device; 5-material guiding device; 6-discharging device; 7-screening cover; 8-rubber soft seal; 9-distributor; 10-crusher; 11-conveyor belt. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described only by way of illustration. Needless to say, those of ordinary skill in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0030] Embodiment 1:

[0031] like Figure 1As shown, a high-efficiency combined ore screening machine comprises a frame, which serves as a mounting base of the device, and the frame comprises an upper screening frame 1 and a lower screening frame 2, the upper screening frame 1 is provided with an upper screening device 3, the lower screening frame 2 is provided with a lower screening device 4, the lower screening device 4 is arranged below the upper screening device 3 and is a lower screening device 4 for receiving the material screened by the upper screening device 3, the upper screening device 3 and the lower screening device 4 are respectively mounted on the upper screening frame 1 and the lower screening frame 2 through a shock absorbing device, the upper screening device 3 and the lower screening device 4 are both inclinedly arranged and have the same inclination direction, the head end of the lower screening device 4 and the head end of the upper screening device 3 are staggered front and back, and a device for screening the material screened by the upper screening device 3 and the lower screening device 4 is inclinedly arranged between the head end of the upper screening device 3 and the head end of the lower screening device 4. The screened material at the head end of the upper screening device 3 is guided to the material guiding device 5 at the head end of the lower screening device 4. The function of the material guiding device 5 is to guide the flow direction of the material so that the material dropped from the head end of the upper screening device 3 can smoothly enter the head end of the lower screening device 4. The material is distributed from the entire screen surface of the bottom screen of the upper screening device 3 to the screen surface of the material guiding device 5 and the top screen of the lower screening device 4, so that the top screen of the lower screening device 4 is evenly distributed in all directions, the material screening effect is better, and the screening efficiency of the lower screening device 4 is greatly improved; the end of the upper screening device 3, the end of the lower screening device 4, and the bottom of the lower screening device 4 are respectively provided with a discharging device 6, which can be used to receive materials of different grades. The discharging device 6 arranged at the end is a discharging channel, and the discharging device 6 arranged below is a discharging hopper. Here, the direction of the inclined flow of the material is defined as the front, that is, Figure 1 The right side in the middle is the front of the device, so the head end of the lower screening device 4 is located in front of the head end of the upper screening device 3.

[0032] Advantages of the present invention:

[0033] (1) Since the device includes two screening devices at the same time, its screening effect is significantly better than that of one screening device. It can not only meet the current multi-stage screening needs for ore, but also, since the upper screening device 3 and the lower screening device 4 are stacked up and down, the structure is compact and the space occupied is small. During the screening process of the upper screening device 3, small particles directly fall onto the lower screening device 4 for the next screening. Unlike the prior art, a conveyor belt is no longer required for transfer and transportation between the two-stage screening devices. This not only saves the space occupied by the conveyor belt, but also reduces the transportation energy consumption, improves the screening efficiency, and has a low cost.

[0034] (2) Since the head end of the lower screening device 4 is staggered with the head end of the upper screening device 3, the role of this staggered part is to compensate for the problem of the vacant area at the head end of the screen in the prior art. The material falling from the upper screening device 3 to the lower screening device 4, that is, the material sliding on the upper screening device 3 for a certain distance before falling, since the head end of the lower screening device 4 is staggered forward, the material directly falls to the head end of the lower screening device 4 at this time, and no vacant area will be formed on the lower screening device 4; at the same time, even if the material discharged from the head end of the upper screening device 3 is small, the material will be guided to the head end of the lower screening device 4 by the material guiding device 5, so that the material can fully fall into the head end of the lower screening device 4, so that the effective screening path on the lower screening device 4 will be fully utilized, which is different from the prior art. Figure 8 Compared with the structure of the present invention, the effective screening path of the present invention is significantly longer, which reduces the phenomenon of screen waste, so its screening effect is better; in addition, the entire screen surface of the bottom screen of the upper screening device is the material discharge surface, and the material is evenly distributed on the screen surface of the bottom screen of the upper screening device. At this time, after falling into the lower screening device, the material will not accumulate in a concentrated manner as in the prior art, and can be quickly screened in the lower screening device, thereby improving the screening efficiency;

[0035] (3) The screening frequencies of the upper screening device 3 and the lower screening device 4 can be adjusted separately, and the screening frequencies between the two can be adjusted separately as needed. Different frequencies can not only effectively reduce noise, but also different frequencies are used to screen materials of different particle sizes. For example, the frequency of the upper screening device 3 is lowered and the frequency of the lower screening device 4 is increased. Materials with large particles are easy to screen. When passing through the upper screening device 3, they will not be crushed due to the low frequency, thereby improving the yield of large particle materials. Materials with small particles are not easy to screen. When passing through the lower screening device 4, they can be screened thoroughly due to the high frequency. By setting different frequencies, different needs can be met and a good screening effect can be achieved. In addition, compared with the prior art that only one motor is used, two motors are used to work separately, and the load of each motor becomes smaller, so the motor loss is smaller and the failure rate is lower.

[0036] The upper screening device 3 includes an upper screen box, in which at least two layers of upper screens are arranged, and an upper excitation device is arranged on the upper screen box. In this embodiment, two layers of upper screens are arranged in the upper screen box, which are defined as an upper top screen and an upper bottom screen according to the upper and lower positions, respectively. A material discharge port is arranged at the head end of the upper top screen, and the material is discharged through the material distributor 9 at the material discharge port, see Figure 3After the ore is crushed by the crusher 10, it is input to the distributor 9 through the conveyor belt 11. When the material is discharged from the distributor 9, the material with large particles will continue to slide downward along the upper top screen, and be discharged from the end discharge channel to form a grade of material, while the material with small particles will pass through the upper top screen and fall into the upper bottom screen, and be screened along the upper bottom screen. The material with smaller particles passes through the upper bottom screen to form the undersize, and continues to fall onto the lower screening device 4, while the material with slightly larger particles is discharged from the end discharge channel to form the second grade of material.

[0037] The lower-level screening device 4 comprises a lower-level screen box, in which at least two layers of lower-level screens are arranged, and a lower-level exciting device is correspondingly arranged on the lower-level screen box. The top of the lower-level screen box is open, and the top of the lower-level screen box is arranged as an open structure, which is used to ensure that the material with small particles on the upper bottom screen can fall into the lower-level screening device 4 at any time. In this embodiment, two layers of lower-level screens are arranged in the lower-level screen box, which are defined as a lower-level top-level screen and a lower-level bottom-level screen according to the upper and lower positions, respectively. The entire surface (screen surface) of the lower-level top-level screen is a material receiving surface. When the material is discharged from the upper-level bottom-level screen, the material with large particles will continue to slide downward along the lower-level top-level screen, and be discharged from the discharge channel at the end to form the third grade of material, while the material with small particles will pass through the lower-level top-level screen and evenly fall into the lower-level bottom-level screen, and be screened along the lower-level bottom-level screen. The material with large particles will be discharged from the discharge channel at the end to form the fourth grade of material, while the material with the smallest particles will pass through the lower-level bottom-level screen and fall, and be discharged from the discharge hopper below to form the fifth grade of material. The present device can screen five grades of materials by combining two screening devices to meet the ore screening requirements.

[0038] Here, the mesh numbers of the upper top screen, the upper bottom screen, the lower top screen and the lower bottom screen gradually increase, that is, the aperture gradually decreases. The screen surface length of the lower top screen and the lower bottom screen can be equal to or greater than the screen surface length of the upper top screen and the upper bottom screen.

[0039] The material guide device 5 is an inclined material guide plate, which is a wear-resistant plate with high wear resistance. The two ends of the inclined material guide plate are respectively connected to the bottom of the head end of the upper screening device 3 and the upper part of the head end of the lower screening device 4. The top end of the inclined material guide plate is connected to the outside of the head end of the upper screening device 3, and the bottom end of the inclined material guide plate is connected to the inside of the head end of the lower screening device 4, and is installed on the support frames of the upper screening device 3 and the lower screening device 4 by screws. The inclined material guide plate is relatively long and has a rigid wear-resistant structure. The gap between the material guide device and the upper screening device and the lower screening device is softly sealed, which can ensure that when the upper screening device 3 or the lower screening device 4 vibrates, the inclined material guide plate guides the material into the lower screening device, and the gap does not leak material or air.

[0040] A screening cover 7 is provided above the upper screening device 3, between the upper screening device 3 and the lower screening device 4, and outside the discharging device 6. The screening cover 7 is connected to a dust removal device to achieve high efficiency, energy saving and environmental protection. The material guiding device 5 is located inside the screening cover 7.

[0041] See also Figure 2 The connection between the screening cover 7 and the upper screening device 3, the lower screening device 4, and the discharging device 6, as well as the connection between the discharging device 6 and the lower screening device 4, are provided with sealing structures to ensure that each connection is sealed. The sealing structure is a soft connection seal. The screening cover 7 is provided to avoid dust splashing during the vibration of the screening device, and the sealing structure is used to ensure the sealing effect of the connection, so as to achieve the effect of no dust spillage; the sealing structure is Figure 2 In the middle structure, the soft connection seal is a rubber soft seal 8, the upper end of the rubber soft seal 8 is arranged on the outside, the lower end of the rubber soft seal 8 is arranged on the inside, and both are fixed with screws. The middle part of the rubber soft seal 8 is provided with folds that can be deformed to meet the vibration of the screening device. When the screening device vibrates, the rubber soft seal 8 will not break.

[0042] Embodiment 2:

[0043] The difference between this embodiment and other embodiments is that: in this embodiment, three layers of upper screens are arranged in the upper screen box, which are respectively defined as upper top screen, upper middle screen and upper bottom screen according to the upper and lower positions; three layers of lower screens are arranged in the lower screen box, which are respectively defined as lower top screen, lower middle screen and lower bottom screen according to the upper and lower positions, that is, this device is provided with six layers of screens in total, which can be used to screen seven different grades of materials.

[0044] Embodiment three:

[0045] The difference between this embodiment and other embodiments is that: in this embodiment, three layers of upper screens are arranged in the upper screen box, which are respectively defined as an upper top screen, an upper middle screen and an upper bottom screen according to the upper and lower positions; two layers of lower screens are arranged in the lower screen box, which are respectively defined as a lower top screen and a lower bottom screen according to the upper and lower positions, that is, this device is provided with five layers of screens in total, which can be used to screen six different grades of materials.

[0046] Embodiment 4:

[0047] The difference between this embodiment and other embodiments is that: in this embodiment, two layers of upper screens are arranged in the upper screen box, which are respectively defined as an upper top screen and an upper bottom screen according to the upper and lower positions; three layers of lower screens are arranged in the lower screen box, which are respectively defined as a lower top screen, a lower middle screen and a lower bottom screen according to the upper and lower positions, that is, this device is provided with five layers of screens in total, which can be used to screen six different grades of materials.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An efficient combined ore screening machine, comprising a frame, characterized in that: The upper screening device is installed on the frame, and the lower screening device is installed on the frame and receives the screened material of the upper screening device below the upper screening device, and the upper screening device and the lower screening device are both inclined and have the same inclination direction, and the head end of the lower screening device and the head end of the upper screening device are staggered front and back, and the head end of the lower screening device is located in front of the head end of the upper screening device, and a material guiding device is inclinedly arranged between the head end of the upper screening device and the head end of the lower screening device for guiding the screened material at the head end of the upper screening device to the head end of the lower screening device, and the material guiding device is used to guide the flow direction of the material so that the material falling from the head end of the upper screening device can smoothly enter the head end of the lower screening device, and the material is distributed from the entire screening surface of the bottom screen of the upper screening device to the screening surface of the material guiding device and the top screen of the lower screening device; A discharging device is respectively provided at the end of the upper screening device, the end of the lower screening device, and below the lower screening device; The material guide device is an inclined material guide plate, the two ends of which are respectively connected to the bottom of the head end of the upper screening device and the upper part of the head end of the lower screening device, the top end of the inclined material guide plate is connected to the outside of the head end of the upper screening device, the bottom end of the inclined material guide plate is connected to the inside of the head end of the lower screening device, and is installed on the support frames of the upper screening device and the lower screening device by screws, and the inclined material guide plate is relatively long and has a rigid wear-resistant structure, and the gap between the material guide device and the upper screening device and the lower screening device adopts a soft seal, which can ensure that when the upper screening device or the lower screening device vibrates, the inclined material guide plate guides the material into the lower screening device, and the gap does not leak material and air; A screening cover is provided above the upper screening device, between the upper screening device and the lower screening device, and outside the discharging device; the material guiding device is located inside the screening cover; Sealing structures are correspondingly provided at the connection points between the screening cover and the upper screening device, the lower screening device and the discharging device, as well as at the connection points between the discharging device and the lower screening device; the sealing structure is a soft connection seal, which is a rubber soft seal, the upper end of which is arranged on the outside, and the lower end of which is arranged on the inside, and both are fixed with screws, and wrinkles are left in the middle of the rubber soft seal which can be deformed to meet the vibration of the screening device, and the rubber soft seal will not break when the screening device vibrates.

2. The high-efficiency combined ore screening machine according to claim 1, characterized in that: The upper screening device comprises an upper screen box, in which at least two layers of upper screens are arranged, and an upper excitation device is correspondingly arranged on the upper screen box.

3. The high-efficiency combined ore screening machine according to claim 1, characterized in that: The lower-level screening device comprises a lower-level screen box, in which at least two layers of lower-level screens are arranged, and a lower-level exciting device is correspondingly arranged on the lower-level screen box.

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