Coal and stone screening and mixing system

Abstract

The utility model relates to the technical field of calcium oxide production equipment, and particularly discloses a coal material and stone material screening and mixing system which comprises a stone material screening hopper, a coal material screening hopper, a stone material storage bin and a coal material storage bin, stone material particles with the particle size being 3-9 cm can be obtained through the stone material screening hopper, coal material particles with the particle size being 1-3 cm can be obtained through the coal material screening hopper, the outlet end of the stone screening hopper is communicated with a stone storage bin, the outlet end of the coal screening hopper is communicated with a coal storage bin, weighing mechanisms are arranged at outlets of the stone storage bin and the coal storage bin, a conveying belt device is horizontally arranged at the outlets of the stone storage bin and the coal storage bin, and the outlet end of the conveying belt device is communicated with a mixing hopper. According to the scheme, the problem that the yield of calcium oxide is affected due to the fact that the particle size and proportion of coal and stone cannot be accurately controlled in existing equipment can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of calcium oxide production equipment, in particular to a coal and stone screening and mixing system. Background Art

[0002] The production process of calcium oxide requires stone with calcium carbonate as raw material and coal as fuel, which are mixed together and calcined. When mixing stone and coal, stone and coal are usually placed on a conveyor belt at the same time. The conveyor belt carrying stone and coal transports the stone and coal to another conveyor belt during the rotation process to complete the mixing of stone and coal, and then the conveyor belt transports the stone and coal to the corresponding position.

[0003] The above-mentioned scheme is a mixed conveying equipment for stone and coal disclosed in the Chinese utility model patent with announcement number CN210365809U, which includes a first conveying device and a second conveying device, the discharge end of the first conveying device is above the feed end of the second conveying device, and also includes a shaking device, the shaking device includes a fixed plate, a shaking plate and a reciprocating drive device for driving the shaking plate to reciprocate, the first conveying device is arranged on the shaking plate, the shaking plate is slidably matched with the fixed plate, the reciprocating drive device is arranged on the fixed plate, and the output end of the reciprocating drive device is connected to the shaking plate; the first conveying device of this mixed conveying equipment for stone and coal is in a shaking state relative to the ground, so that the stone and coal can be shaken and mixed better.

[0004] The defect of the above scheme is that when mixing stone and coal, it is difficult to directly control the particle size and ratio of coal and stone by mixing directly on the belt. In order to improve the yield of calcium oxide, our company has determined the preferred particle size and ratio of coal and stone after many experiments. The mesh sizes required for coal and stone are different. Coal requires particles of 1 to 3 mm and stone requires particles of 3 to 9 mm. Therefore, it is impossible to use the above scheme to directly mix coal and stone on the same conveyor belt. They need to be screened before entering the mixing process. Therefore, our company proposes a new coal and stone screening and mixing system to accurately control the particle size and ratio of coal and stone. Utility Model Content

[0005] The utility model provides a coal and stone screening and mixing system to solve the problem that the particle size and proportion of coal and stone in the existing equipment cannot be accurately controlled to affect the yield of calcium oxide.

[0006] To solve the above problems, the technical scheme adopted by the utility model is as follows: a coal and stone screening and mixing system, including a stone screening bucket, a coal screening bucket, a stone storage bin and a coal storage bin. Stone particles with a particle size of 3 to 9 cm can be obtained through the stone screening bucket, and coal particles with a particle size of 1 to 3 cm can be obtained through the coal screening bucket. The outlet end of the stone screening bucket is connected to the stone storage bin, and the outlet end of the coal screening bucket is connected to the coal storage bin. Weighing mechanisms are provided at the outlets of the stone storage bin and the coal storage bin, and conveyor belt devices are horizontally provided at the outlets of the stone storage bin and the coal storage bin, and the outlet end of the conveyor belt device is connected to the mixing hopper.

[0007] The basic principle of this scheme is: the stone and coal are screened separately through the screening bucket to obtain the particles of the required particle size, the stone and coal are stored in the stone storage bucket and the coal storage bucket respectively, and the stone storage bin and the coal storage bin are controlled by the weighing mechanism to release a fixed proportion of stone and coal, and the stone and coal are discharged onto the conveyor belt and then transported to the mixing hopper through the conveyor belt.

[0008] The beneficial effects of this program are:

[0009] When mixing stone and coal, it is difficult to directly control the particle size and ratio of coal and stone by mixing directly on the belt, resulting in large fluctuations in the yield of calcium oxide. This solution uses separately set screening buckets to screen out stone and coal particles of specific particle sizes, thereby strictly controlling the mesh size of stone and coal. Coal, as fuel, provides heat for the reaction. Smaller particle size means larger surface area, which can accelerate heat transfer and reaction speed. Stone, as raw material, participates in chemical reactions. Appropriate particle size can ensure sufficient reaction time and contact area, increase reaction rate, thereby improving the utilization rate of stone and coal, and can accurately control the impact on the yield of calcium oxide.

[0010] Furthermore, the weighing mechanism includes supporting ears and weighing sensors. The supporting ears are symmetrically arranged on the side walls of the stone storage bin and the coal storage bin. The stone storage bin and the coal storage bin are respectively mounted on external brackets through the supporting ears. A weighing sensor is arranged between the bracket and the supporting ears. The weighing sensor is electrically connected to the external controller. Electric control valves are respectively arranged at the outlets of the stone storage bin and the coal storage bin. The electric control valves are electrically connected to the external controller. The switch of the electric control valves is controlled by the controller, and the weight of the stone and coal discharged from the stone storage bin and the coal storage bin is controlled by the weight value preset by the controller.

[0011] Furthermore, the weight ratio of coal discharged from the coal storage bin and the stone storage bin to stone is 0.75-0.85.

[0012] Furthermore, the conveyor belt device includes a first frame and a second frame, wherein the first frame is horizontally arranged on the ground, a groove with an opening upward is opened in the middle of the first frame, a rotating shaft is horizontally arranged in the groove, the end of the rotating shaft is key-connected with a driving device, and a plurality of gears are arranged at intervals along the length of the rotating shaft; the second frame is slidably connected to the top of the first frame, the left and right ends of the first frame are provided with guide grooves with an opening upward, the guide grooves are arranged along the width of the first frame, guide bars matching the guide grooves are arranged on the bottom surfaces of the two ends of the second frame, the guide bars can slide in the guide grooves, racks are respectively meshed at the corresponding gears on the bottom surface of the second frame, and the racks are arranged parallel to the guide grooves; the driving device is electrically connected to the controller of the external device, and the racks can be driven to reciprocate by the forward and reverse rotation of the driving device;

[0013] Axially horizontal rollers are installed at both ends of the top of the second frame, and belts are installed between the rollers. The belts can be driven to move horizontally through the rotation of the rollers.

[0014] Furthermore, one end of the belt is located directly below the stone storage bin and the coal storage bin, and an inclined discharge plate is provided below the other end of the belt, and the discharge plate is located directly above the mixing hopper.

[0015] Furthermore, shielding strips are respectively provided on both sides of the belt and along the length of the belt to prevent the coal and stone from falling out of the belt due to vibration.

[0016] Furthermore, the shielding strips on both sides of the belt are arranged to be inclined toward the outside of the belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an embodiment of the utility model;

[0018] Figure 2 Schematic diagram of a conveyor belt device in an embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The figure marks in the drawings of the specification include: stone screening bucket 1, coal screening bucket 2, stone storage bin 3, coal storage bin 4, weighing mechanism 5, supporting ear 51, weighing sensor 52, conveyor belt device 6, mixing hopper 7, first frame 61, belt 62, roller 63, second frame 64, guide groove 65, guide bar 66, driving device 67, rotating shaft 68, gear 81, rack 82, mounting plate 83, discharge plate 84, shielding strip 85.

[0021] The embodiment is basically as shown in the attached Figure 1 To Attachment Figure 2 As shown:

[0022] like Figure 1As shown, the coal and stone screening and mixing system includes a stone screening bucket 1 and a coal screening bucket 2 which are respectively arranged. Specifically, the stone screening bucket 1 and the coal screening bucket 2 can be linear screening mechanisms, such as a vibrating screening machine. In this embodiment, the particle size of the stone is required to be 3-9 cm particles, and the particle size of the coal is required to be 1-3 cm particles. The stone screening bucket 1 and the coal screening bucket 2 are connected to the stone storage bin 3 and the coal storage bin 4 at their outlets respectively. The openings of the stone storage bin 3 and the coal storage bin 4 are respectively located below the outlet of the screening bucket, so that the screened stone and coal can fall directly into the storage bin under the action of gravity.

[0023] In this embodiment, the outer walls of the stone storage bin 3 and the coal storage bin 4 are symmetrically provided with support ears 51, and the entire storage bin is mounted on an external bracket through the support ears 51. A weighing sensor 52 is arranged between the bracket and the support ears 51, and the weighing sensor 52 is electrically connected to the external controller. An electric control valve is arranged at the outlet of the storage bin, and the electric control valve is electrically connected to the external controller. The weight of the entire storage bin can be read in real time through the weighing sensor 52. The weight of the material required for each batch of calcium oxide production is preset in the controller. When the material in the storage bin needs to be discharged, the controller opens the electric control valve, and the material is continuously discharged. The weighing sensor 52 continuously feeds back the reading in the material bin until the material discharged from the material bin reaches the preset weight value. In this embodiment, the ratio of coal to stone is 0.81.

[0024] A horizontal conveyor belt device 6 is arranged below the storage bin. When the stone and coal in the material bin are discharged downward, all the materials are located on the conveyor belt device 6. The conveyor belt device 6 drives the materials to be transported from left to right. A mixing hopper 7 is connected to the lower right end of the conveyor belt device 6. The opening of the mixing hopper 7 is opposite to the outlet of the conveyor belt device 6.

[0025] The conveyor belt device 6 is as follows Figure 2As shown, the conveyor belt device 6 includes a first frame 61 horizontally arranged on the ground, a groove is opened in the middle of the first frame 61, a rotating shaft 68 is horizontally arranged in the groove, and the end of the rotating shaft 68 is key-connected to the driving device 67. In this embodiment, the driving device 67 is a stepper motor, and the stepper motor is electrically connected to the controller of the external device, and the stepper motor can be made to periodically rotate forward and reverse alternately through the controller. The output shaft of the stepper motor is key-connected to the rotating shaft 68, and the output shaft can be driven to rotate along its axis by the stepper motor. Mounting plates 83 are fixed in sequence from left to right inside the groove, and the entire rotating shaft 68 is horizontally limited in the groove by the mounting plates 83. In this embodiment, the number of mounting plates 83 is three, and a bearing is connected between the mounting plates 83 and the rotating shaft 68, so that the rotating shaft 68 can rotate freely. A gear 81 is installed on the rotating shaft 68 between the mounting plates 83, and a second frame 64 is slidably connected above the first frame 61. Guide bars 66 are respectively provided on the bottom surfaces of the second frame 64, and the guide bars 66 are slidably connected between the opposite surfaces of the first frame 61. Upward guide grooves 65 are provided on the top surfaces of the left and right ends of the first frame 61, and the direction of the guide grooves 65 is set along the width of the first frame 61. The length of the guide bar 66 is less than the length of the guide groove 65, so that the guide bar 66 can slide freely along the length of the guide groove 65.

[0026] A rack 82 meshing with the gear 81 is provided on the bottom surface of the second frame 64 at a position corresponding to the gear 81. The rack 82 is also arranged along the width direction of the second frame 64. The rack 82 is parallel to the guide bar 66. When the driving device 67 is started, the rotating shaft 68 drives the gear 81 to rotate. The rotation of the gear 81 drives the meshing rack 82 above to slide in the horizontal direction, thereby driving the second frame 64 to slide in the horizontal direction. At the same time, the guide bar 66 on the second frame 64 can slide in the same direction in the guide groove 65 to prevent the entire second frame 64 from being separated from the first frame 61.

[0027] Axially horizontal rollers 63 are arranged at the left and right ends of the top of the second frame 64, and a horizontal belt 62 is arranged between the two rollers 63. The rotation of the rollers 63 can drive the belt 62 to transmit in the horizontal direction, so as to transmit the material on the belt 62 from left to right. A downwardly inclined discharge plate 84 is installed below the right end of the belt 62. The discharge plate 84 is in the shape of a bucket with an opening facing upward, and the lower part of the discharge plate 84 is directly opposite to the upper opening of the mixing hopper 7. Shielding strips 85 are respectively arranged on both sides of the belt 62 and along the length of the belt 62. The shielding strips 85 on both sides of the belt 62 are arranged obliquely toward the outside of the belt 62.

[0028] The specific implementation process is as follows:

[0029] The coal and stone are respectively transported to the coal screening bucket 2 and the stone screening bucket 1 through the transmission device at the front end. The stone particles after passing through the stone screening bucket 1 reach the particle size standard of 3 to 9 cm, and the coal particles after passing through the coal screening bucket 2 reach the particle size standard of 1 to 3 cm. The stone and coal are respectively transported to the stone storage bin 3 and the coal storage bin 4. When it is necessary to take out the stone and coal in the stone storage bin 3 and the coal storage bin 4, the controller opens the electric control valve, and the degree of the weighing sensor 52 on the stone storage bin 3 changes in real time. When the degree of the weighing sensor 52 on the stone storage bin 3 drops to the preset value, the electric control valve of the stone storage bin 3 is closed. Similarly, the coal in the coal storage bin 4 is discharged outward in the same way. Since the discharge outlets of the stone storage bin 3 and the coal storage bin 4 are both located above the conveyor belt device 6, the falling stone and coal fall on the conveyor belt device 6 at the same time. In this process, the controller starts the drive motor, and the periodic forward and reverse rotation of the drive motor drives the rotating shaft 68 to perform periodic forward and reverse rotation. The gear 81 on the rotating shaft 68 is meshed with the rack 82 on the second frame 64, so that the rack 82 reciprocates forward and backward in the horizontal direction, thereby driving the second frame 64 to reciprocate forward and backward on the first frame 61, and the guide bar 66 of the second frame 64 reciprocates forward and backward in the guide groove 65. Since the belt 62 is installed on the second frame 64, when the second frame 64 reciprocates forward and backward in the horizontal direction, the belt 62 also reciprocates in the horizontal plane along its width direction. Through the vibration on the horizontal plane, the stone and coal carried on the top of the belt 62 are mixed with each other in a certain proportion, so that the stone and coal are further mixed evenly. With the movement of the belt 62, the mixed stone and coal are transported from left to right. After reaching the discharge plate 84 at the right end of the belt 62, the stone and coal enter the mixing hopper 7 for storage. The outlet end of the mixing hopper 7 is connected to a conveying structure, through which the mixed materials can be sent in batches to the rotary kiln for firing reaction. After several hours of firing, finished calcium oxide can be obtained.

[0030] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Coal and stone screening and mixing system, characterized by: It includes a stone screening bucket, a coal screening bucket, a stone storage bin and a coal storage bin. Stone particles with a particle size of 3 to 9 cm can be obtained through the stone screening bucket, and coal particles with a particle size of 1 to 3 cm can be obtained through the coal screening bucket. The outlet end of the stone screening bucket is connected to the stone storage bin, and the outlet end of the coal screening bucket is connected to the coal storage bin. Weighing mechanisms are provided at the outlets of the stone storage bin and the coal storage bin, and conveyor belt devices are horizontally provided at the outlets of the stone storage bin and the coal storage bin, and the outlet end of the conveyor belt device is connected to a mixing hopper.

2. The coal and stone screening and mixing system according to claim 1 is characterized in that: The weighing mechanism includes supporting ears and weighing sensors. The supporting ears are symmetrically arranged on the side walls of the stone storage bin and the coal storage bin. The stone storage bin and the coal storage bin are respectively mounted on external brackets through the supporting ears. The weighing sensors are arranged between the brackets and the supporting ears. The weighing sensors are electrically connected to the external controller. Electric control valves are respectively arranged at the outlets of the stone storage bin and the coal storage bin. The electric control valves are electrically connected to the external controller. The switches of the electric control valves are controlled by the controller, and the weight of the stones and coal discharged from the stone storage bin and the coal storage bin is controlled by the weight values ​​preset by the controller.

3. The coal and stone screening and mixing system according to claim 2 is characterized in that: The weight ratio of coal discharged from the coal storage bin and the stone storage bin to stone is 0.75-0.

85.

4. The coal and stone screening and mixing system according to claim 3 is characterized in that: The conveyor belt device comprises a first frame and a second frame, wherein the first frame is horizontally arranged on the ground, a groove with an opening upward is opened in the middle of the first frame, a rotating shaft is horizontally arranged in the groove, a driving device is keyed to the end of the rotating shaft, and a plurality of gears are arranged at intervals along the length of the rotating shaft; the second frame is slidably connected to the top of the first frame, a guide groove with an opening upward is arranged at the left and right ends of the first frame, the guide groove is arranged along the width of the first frame, guide bars matching the guide groove are arranged on the bottom surfaces of the two ends of the second frame, the guide bars can slide in the guide groove, racks are respectively meshed at the corresponding gears on the bottom surface of the second frame, and the racks are arranged parallel to the guide grooves; the driving device is electrically connected to the controller of the external device, and the racks can be driven to reciprocate by the forward and reverse rotation of the driving device; Axially horizontal rollers are installed at both ends of the top of the second frame, and belts are installed between the rollers. The belts can be driven to move horizontally through the rotation of the rollers.

5. The coal and stone screening and mixing system according to claim 4 is characterized in that: One end of the belt is located directly below the stone storage bin and the coal storage bin, and an inclined discharge plate is provided below the other end of the belt, and the discharge plate is located directly above the mixing hopper.

6. The coal and stone screening and mixing system according to claim 5 is characterized in that: Shielding strips are respectively arranged on both side edges of the belt and along the length of the belt.

7. The coal and stone screening and mixing system according to claim 6 is characterized in that: The shielding strips on both sides of the belt are arranged obliquely toward the outside of the belt.

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