Powder conveying device and calcium carbonate preparation process

Abstract

The invention relates to the technical field of elevators, and provides a powder conveying device and a calcium carbonate preparation technology.The powder conveying device comprises an elevator and a hopper arranged at a feeding port of the elevator, a scattering space is formed in the hopper, a plurality of rotating shafts are rotationally installed in the scattering space, each rotating shaft is connected with a plurality of scattering rods, and the scattering rods are connected with the hopper; the plurality of scattering rods are arranged at intervals around the central axis of the rotating shaft; scattering areas are defined by the scattering rods of the rotating shafts, and the scattering areas of every two adjacent rotating shafts are partially coincident and form a collection area; the hopper is provided with a rotating assembly used for driving all the rotating shafts to rotate. According to the powder conveying device, caking in powder can be eliminated, and the conveying efficiency of the elevator is improved.

Description

Technical Field

[0001] The present application relates to the technical field of elevators, and in particular to a powder conveying device and a calcium carbonate preparation process. Background Art

[0002] The principle of a screw elevator is to use the high-speed rotation of spiral blades to propel materials upward toward the conveying equipment. It is suitable for the continuous conveying of powdered and granular materials. Elevators are required for material conveying in many stages of calcium carbonate production. For example, after the ground calcium carbonate powder is collected by a pulse collector, it is pneumatically conveyed by a screw elevator and a blower, thereby transporting the finished powder to a storage tank for storage.

[0003] Calcium carbonate powder is prone to caking, which may be caused by moisture or insufficient drying during the drying process. In order to eliminate caking in the powder, in the prior art, a hopper is installed at the feed inlet of a screw elevator, and two squeezing rollers are installed in the hopper for rotation. By driving the two squeezing rollers to rotate, the lumps are squeezed and dispersed.

[0004] Although this method can effectively disperse the agglomerates in the powder, the setting of the two squeezing rollers occupies a large amount of falling space in the hopper, resulting in a slow overall discharge speed of the hopper, thereby reducing the conveying efficiency of the elevator, and therefore needs further improvement. Summary of the Invention

[0005] In order to eliminate agglomeration in powder and improve the conveying efficiency of the elevator, the present application provides a powder conveying device and a calcium carbonate preparation process.

[0006] In the first aspect, the present application provides a powder conveying device adopting the following technical solutions: A powder conveying device includes an elevator and a hopper arranged at the elevator feed port, the hopper has a breaking up space inside, and multiple rotating shafts are rotatably installed in the breaking up space, each of the rotating shafts is connected to multiple breaking up rods, and the multiple breaking up rods are arranged at intervals around the central axis of the rotating shaft; the multiple breaking up rods of the rotating shaft are combined to form a breaking up area, and the breaking up areas of two adjacent rotating shafts partially overlap to form a gathering area; the hopper is provided with a rotating assembly for driving all the rotating shafts to rotate.

[0007] By adopting the above-mentioned technical solution, a plurality of breaking rods are provided on the outer peripheral side of each rotating shaft, so that the powder can fall through the gap between two adjacent breaking rods, so that it can smoothly enter the elevator for lifting, thereby improving the conveying efficiency of the elevator. During the hopper unloading process, all rotating shafts are driven to rotate so that the breaking rods can break up the lumps in the powder. In actual operation, the rotation directions of the two adjacent rotating shafts can be controlled to be opposite, so that the breaking rods of the two adjacent rotating shafts can guide the intercepted lumps toward the top of the collection area, so that the breaking rods of the two adjacent rotating shafts can alternately squeeze and crush the lumps, thereby improving the breaking effect of the lumps.

[0008] Optionally, the rotating assembly includes a rotating gear and a rotating motor, the number of the rotating gears is set corresponding to the number of rotating shafts, one end of each rotating shaft passes through the hopper and is coaxially connected to the corresponding rotating gear, and the two adjacent rotating gears are meshed for transmission; the rotating motor is arranged on the side wall of the hopper, and the output shaft of the rotating motor is connected to one of the rotating shafts.

[0009] By adopting the above technical solution, one of the rotating shafts is driven to rotate by the rotating motor, and under the engagement of multiple rotating gears, all the rotating shafts can rotate synchronously, and the rotation directions of two adjacent rotating shafts can be controlled to be opposite.

[0010] Optionally, a connecting bar is provided between each of the breaking up rods and the rotating shaft, one end of the connecting bar is connected to the rotating shaft, and the other end is connected to the breaking up rod, and the breaking up rod is connected to the rotating shaft through the connecting bar; a vibration component for causing the breaking up rod to vibrate is provided in the breaking up space.

[0011] By adopting the above technical solution, the breaking rod is driven to rotate around the central axis of the rotating shaft to break up the lumps in the powder. During this process, the breaking rod is forced to vibrate through the vibration component, thereby improving the effect of breaking up the lumps.

[0012] Optionally, each of the breaking up rods is rotationally connected to the corresponding connecting bar, and a reset torsion spring is provided between the breaking up rod and the corresponding connecting bar; the vibration assembly includes an abutment rod and an abutment plate, the abutment rod is arranged in the gathering area, and one end of the abutment plate is connected to the outer peripheral wall of the breaking up rod. Under normal circumstances, the reset torsion spring forces the free end of the abutment plate to rotate toward the center of the corresponding breaking up area; when the breaking up rod rotates into the adjacent breaking up area, the abutment plate abuts against the abutment rod in the gathering area and forces the reset torsion spring to deform.

[0013] By adopting the above-mentioned technical solution, the breaking rod is driven to "revolve" around the central axis of the rotating shaft. When the breaking rod rotates into the adjacent breaking area, the breaking rod's abutment piece contacts the abutment rod in the collection area. The abutment rod blocks the free end of the abutment piece, forcing the breaking rod to "rotate" around its own central axis, thereby deforming the reset torsion spring and generating elastic force. As the rotating shaft continues to rotate, when the free end of the abutment piece disengages the abutment rod, the elastic force of the reset torsion spring forces the breaking rod to rotate and reset, causing the breaking rod to vibrate to a certain amplitude, thereby improving the effect of breaking up the lumps.

[0014] Optionally, there is an extrusion space inside the hopper, and the extrusion space is located below the breaking up space; a first sliding rod and a second sliding rod are respectively slidably installed in the extrusion space, the first sliding rod is connected to a plurality of first extrusion bars, and the second sliding rod is connected to a plurality of second extrusion bars, the plurality of first extrusion bars and the plurality of second extrusion bars are arranged in an staggered manner, and an extrusion area is formed between adjacent first extrusion bars and second extrusion bars; the hopper is provided with a first driving assembly, and the first driving assembly is used to drive the first sliding rod and the second sliding rod to slide to expand or shrink the extrusion area.

[0015] By adopting the above-mentioned technical solution, the powder falls into the extrusion space after passing through the breaking-up space, and then falls into the extrusion area. The first driving component forces the first sliding rod and the second sliding rod to slide to shrink the extrusion area. The shrunken extrusion area can extrude the powder in this extrusion area, thereby further improving the effect of breaking up the agglomerates.

[0016] Optionally, the first driving assembly includes a first driving disk, a second driving disk, a first sliding frame and a second sliding frame, the first driving disk and the second driving disk are respectively connected to different rotating shafts, and the rotation direction of the rotating shaft of the first driving disk is opposite to the rotating shaft of the second driving disk; one end of the first sliding rod passes through the hopper and is connected to the first sliding frame, and one end of the second sliding rod passes through the hopper and is connected to the second sliding frame; a first eccentric column is provided on the surface of the first driving disk, and the first sliding frame has a first guide groove for the first eccentric column to be embedded, and a second eccentric column is provided on the surface of the second driving disk, and the second sliding frame has a second guide groove for the second eccentric column to be embedded.

[0017] By adopting the above-mentioned technical solution, the first and second drive discs are respectively arranged on two rotating shafts with opposite rotation directions. This allows the rotating shafts to rotate the first and second drive discs in opposite directions, thereby causing the first and second sliding rods to slide in opposite directions. This results in the following effects: when the extrusion zone on one side of the first extrusion bar (or second extrusion bar) expands, the extrusion zone on the other side contracts. The contracted extrusion zone compresses the powder within it, improving the agglomeration effect. The expanded extrusion zone, on the other hand, provides space for powder to fall into the deagglomeration space. This synchronizes the extrusion and fall of the powder, allowing it to continuously fall to the elevator's feed port, ensuring the elevator's conveying efficiency.

[0018] Optionally, the thickness of the first extruded strip gradually decreases from top to bottom.

[0019] By adopting the above-mentioned technical solution, the thickness of the first extrusion strip gradually decreases from top to bottom, thereby forming a "guide surface". When the first extrusion strip and the adjacent second extrusion strip approach each other, the powder in the extrusion area therebetween is squeezed. During the extrusion process, the first extrusion strip can form a downward extrusion force on the powder so that the powder falls into the elevator.

[0020] Optionally, heating plates are embedded in the interior of the first extruded strip and the interior of the second extruded strip.

[0021] By adopting the above technical solution, the first extrusion strip and the second extrusion strip are heated by the heating plate, and the temperature in the extrusion zone is adjusted, which helps to evaporate the water in the powder and thus improves the effect of breaking up the lumps.

[0022] Optionally, a third sliding rod and a fourth sliding rod are respectively installed in the extrusion space for sliding movement, the third sliding rod is connected to a plurality of third extrusion bars, and the fourth sliding rod is connected to a plurality of fourth extrusion bars, the plurality of third extrusion bars and the plurality of fourth extrusion bars are arranged in an staggered manner, and a falling area is formed between adjacent third extrusion bars and fourth extrusion bars; the hopper is provided with a second driving assembly, and the second driving assembly is used to drive the third sliding rod and the fourth sliding rod to slide to expand or shrink the falling area; the number of the falling areas is set corresponding to the number of the extrusion areas, and each of the falling areas is located below the corresponding extrusion area, and when the extrusion area expands, the corresponding falling area shrinks, and when the extrusion area shrinks, the corresponding falling area expands.

[0023] By adopting the above-mentioned technical solution, on the one hand, the provision of the third extrusion strip and the fourth extrusion strip can further extrude the small-sized lumps remaining in the powder material, thereby improving the effect of breaking up the lumps. On the other hand, when the extrusion zone is expanded, the corresponding falling zone is reduced, thereby forming a shield for the bottom of the expanded extrusion zone, slowing down the falling speed of the powder material in the expanded extrusion zone, increasing the retention time of the lumps in the expanded extrusion zone, and reducing the possibility that the lumps cannot be squeezed out by the first and second extrusion strips due to the lumps falling too fast, and also helping to evaporate the moisture in the lumps. On the third hand, when the extrusion zone is expanded, the adjacent extrusion zones on both sides are reduced, and the falling zone below the reduced extrusion zone is expanded. The expanded falling zone can facilitate the rapid falling of the powder material in the reduced extrusion zone above.

[0024] In a second aspect, the present application provides a calcium carbonate preparation process using the following technical solutions: A calcium carbonate preparation process specifically comprises the following steps: S1, pretreatment: grinding calcium carbonate raw materials to obtain powder; S2, transportation and storage: transporting the powder to a storage tank via an elevator for storage.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up multiple breaking rods on the outer circumference of each rotating shaft, the powder can fall through the gap between two adjacent breaking rods, so that it can smoothly enter the elevator for lifting, improving the conveying efficiency of the elevator. During the hopper unloading process, the rotation directions of the two adjacent rotating shafts are driven in opposite directions, so that the breaking rods of the two adjacent rotating shafts can guide the intercepted lumps toward the top of the collection area, so that the breaking rods of the two adjacent rotating shafts can alternately squeeze and crush the lumps, improving the breaking effect of the lumps; 2. The abutment rod is configured to cause the breaking rod to "revolve" around the central axis of the rotating shaft. When the breaking rod enters an adjacent breaking zone, the abutment piece of the breaking rod abuts against the abutment rod in the collection zone. The abutment rod blocks the free end of the abutment piece, forcing the breaking rod to "rotate" around its own central axis, thereby deforming the reset torsion spring and generating elastic force. As the rotating shaft continues to rotate, when the free end of the abutment piece disengages from the abutment rod, the elastic force of the reset torsion spring forces the breaking rod to rotate and reset, causing the breaking rod to vibrate to a certain amplitude, improving the effect of breaking up lumps. 3. Through the configuration of the first drive assembly, the first and second drive discs are respectively arranged on two rotating shafts with opposite rotation directions. This allows the rotating shafts to rotate the first and second drive discs in opposite directions, thereby causing the first and second sliding rods to slide in opposite directions. This results in the following effects: when the extrusion zone on one side of the first extrusion bar (or second extrusion bar) expands, the extrusion zone on the other side contracts. The contracted extrusion zone compresses the powder within it, improving the agglomeration effect. The expanded extrusion zone, on the other hand, allows the powder in the deagglomeration space to fall into it. This synchronizes the extrusion and fall of the powder, allowing it to continuously fall to the elevator's feed port, ensuring the elevator's conveying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of Example 1; Figure 2 This is a partial cross-sectional view of the scattering area and the gathering area of Example 1; Figure 3 This is a schematic structural diagram of the rotating assembly according to Example 1; Figure 4 This is a schematic structural diagram of a rotating ring according to Example 2; Figure 5 is a partial cross-sectional view of a return torsion spring according to embodiment 2; Figure 6 is a partial cross-sectional view of the abutment rod according to embodiment 2; Figure 7 is a partial cross-sectional view of the first extruded strip and the second extruded strip in Example 3; Figure 8 This is a schematic diagram of a state in which the first sliding rod and the second sliding rod are away from each other, embodying embodiment 3; Figure 9 This is a schematic structural diagram of the first drive assembly according to Example 3; Figure 10 FIG. 4 is a partial cross-sectional view of the third extruded strip and the fourth extruded strip according to Example 4.

[0027] Explanation of reference numerals: 1. elevator; 2. hopper; 21. scattering space; 22. extrusion space; 23. first sliding rod; 231. first extrusion bar; 232. first through-hole; 24. second sliding rod; 241. second extrusion bar; 242. second through-hole; 25. extrusion zone; 26. third sliding rod; 261. third extrusion bar; 27. fourth sliding rod; 271. fourth extrusion bar; 28. drop zone; 29. support plate; 3. rotating shaft; 31. scattering rod; 32. scattering zone; 321. gathering zone; 33. connecting bar; 331. complex Position torsion spring; 332, rotating ring; 4, rotating assembly; 41, rotating gear; 5, vibrating assembly; 51, abutment rod; 52, abutment plate; 6, first driving assembly; 61, first driving disk; 611, first eccentric column; 62, second driving disk; 621, second eccentric column; 63, first sliding frame; 631, first guide groove; 64, second sliding frame; 641, second guide groove; 7, second driving assembly; 71, first rack; 72, second rack; 73, third rack; 74, fourth rack; 75, first gear; 76, second gear. DETAILED DESCRIPTION

[0028] The following combination Figures 1-10 This application is described in further detail.

[0029] Example 1: The embodiment of the present application discloses a powder conveying device.

[0030] Reference Figure 1 、 Figure 2 A powder conveying device includes an elevator 1 and a hopper 2. In this embodiment, the elevator 1 is a spiral elevator 1 (the spiral elevator 1 is a prior art, and its principle and internal structure are not elaborated on here); the hopper 2 is installed at the feed port of the elevator 1.

[0031] The interior of the hopper 2 has a breaking up space 21, in which a plurality of rotating shafts 3 are rotatably installed, and the plurality of rotating shafts 3 are arranged at intervals along the horizontal direction; a plurality of connecting bars 33 are fixedly installed on the outer peripheral wall of each rotating shaft 3, and the plurality of connecting bars 33 are arranged at intervals around the central axis of the rotating shaft 3, and one end of each connecting bar 33 is fixedly connected to the outer peripheral wall of the rotating shaft 3, and the other end is connected to a breaking up rod 31, and the plurality of breaking up rods 31 are connected to the rotating shaft 3 through their respective corresponding connecting bars 33.

[0032] The multiple breaking rods 31 on the periphery of each rotating shaft 3 form a breaking area 32, and the multiple rotating shafts 3 form multiple breaking areas 32. The breaking areas 32 of two adjacent rotating shafts 3 partially overlap to form a gathering area 321; the hopper 2 is provided with a rotating component 4 for driving all the rotating shafts 3 to rotate.

[0033] Reference Figure 2 、 Figure 3 In this embodiment, the rotating assembly 4 includes a rotating gear 41 and a rotating motor. The number of the rotating gears 41 is set corresponding to the number of the rotating shafts 3. One end of each rotating shaft 3 passes through the hopper 2 and is coaxially connected to the corresponding rotating gear 41, and the two adjacent rotating gears 41 are engaged and transmitted; the rotating motor (not shown in the figure) is fixedly installed on the side wall of the hopper 2, and the output shaft of the rotating motor can be connected to one of the rotating shafts 3 by a belt connection; with this design, when the output shaft of the rotating motor rotates, it can drive all the rotating shafts 3 to rotate synchronously, and the rotation directions of the two adjacent rotating shafts 3 are opposite.

[0034] The implementation principle of Example 1 of the present application is: a plurality of breaking rods 31 are set on the outer peripheral side of each rotating shaft 3, so that the powder can fall through the gap between two adjacent breaking rods 31, so that it can smoothly enter the elevator 1 for lifting, thereby ensuring the conveying efficiency of the elevator 1.

[0035] During the discharge process of the hopper 2, all rotating shafts 3 are driven to rotate, causing the breaking rods 31 to break up lumps in the powder. At the same time, the rotation directions of two adjacent rotating shafts 3 are opposite, so that the breaking rods 31 of the two adjacent rotating shafts 3 can guide the intercepted lumps toward the top of the collection area 321. Therefore, the breaking rods 31 of the two adjacent rotating shafts 3 can alternately squeeze and crush the lumps at the top of the collection area 321, thereby improving the breaking up of lumps.

[0036] Example 2: This embodiment of the present application discloses a powder conveying device.

[0037] The powder conveying device disclosed in the embodiment of the present application differs from that in embodiment 1 in that: Reference Figure 4 、 Figure 5 In this embodiment, a rotating ring 332 is installed at one end of each connecting bar 33 away from the rotating shaft 3, and the breaking rod 31 is passed through the rotating ring 332 of the corresponding connecting bar 33 and is rotatably connected to the rotating ring 332, so that the breaking rod 31 can "rotate" around its own central axis, and a return torsion spring 331 is installed between the breaking rod 31 and the rotating ring 332 of the corresponding connecting bar 33; a vibration component 5 for causing the breaking rod 31 to vibrate is provided in the breaking space 21.

[0038] Reference Figure 4 、 Figure 6 The vibration assembly 5 includes an abutment rod 51 and an abutment plate 52. There are multiple abutment rods 51 and they are arranged corresponding to multiple collection areas 321. Each abutment rod 51 is located at the center position of the corresponding collection area 321. One end of the abutment rod 51 is fixedly connected to the inner wall of the hopper 2.

[0039] There are multiple abutment plates 52 and they are corresponding to multiple breaking up rods 31. One end of the abutment plate 52 is fixedly connected to the outer peripheral wall of the corresponding breaking up rod 31. The abutment plate 52 and the connecting strip 33 of the rotating shaft 3 are arranged at intervals along the axial direction of the breaking up rod 31. For the convenience of description, the side of the abutment plate 52 away from the breaking up rod 31 is defined as the free end of the abutment plate 52 below. Under normal circumstances, the reset torsion spring 331 forces the free end of the abutment plate 52 to rotate toward the center of the corresponding breaking up area 32; when the breaking up rod 31 rotates into the adjacent breaking up area 32, the abutment plate 52 abuts against the outer peripheral wall of the abutment rod 51 in the gathering area 321, and forces the reset torsion spring 331 to deform.

[0040] It should be noted that in this embodiment, the abutment rod 51 and the connecting bar 33 of the rotating shaft 3 are arranged at axial intervals along the breaking up rod 31 to avoid the connecting bar 33 of the rotating shaft 3, thereby reducing the possibility of interference between the connecting bar 33 and the abutment rod 51 when the rotating shaft 3 drives the connecting bar 33 to rotate.

[0041] The implementation principle of Example 2 of the present application is as follows: the breaking rod 31 is driven to "revolve" around the central axis of the rotating shaft 3. When the breaking rod 31 rotates into the adjacent breaking area 32, the abutment piece 52 of the breaking rod 31 abuts against the abutment rod 51 in the collecting area 321. The abutment rod 51 blocks the free end of the abutment piece 52, forcing the breaking rod 31 to "rotate" around its own central axis, thereby deforming the reset torsion spring 331 and generating elastic force. As the rotating shaft 3 continues to rotate, when the free end of the abutment piece 52 disengages from the abutment rod 51, the elastic force of the reset torsion spring 331 forces the breaking rod 31 to rotate and reset, thereby causing the breaking rod 31 to vibrate to a certain amplitude, thereby improving the effect of breaking up the lumps.

[0042] Example 3: This embodiment of the present application discloses a powder conveying device.

[0043] The powder conveying device disclosed in the embodiment of the present application differs from that in embodiment 1 in that: Reference Figure 7 、 Figure 8In this embodiment, the hopper 2 has an extrusion space 22 located below the disintegration space 21. A first sliding rod 23 and a second sliding rod 24 are slidably mounted in the extrusion space 22. Both ends of the first sliding rod 23 and the second sliding rod 24 extend horizontally. The first sliding rod 23 is fixedly connected to a plurality of first extrusion bars 231, which are arranged at intervals along the length of the first sliding rod 23. The second sliding rod 24 is fixedly connected to a plurality of second extrusion bars 241, which are arranged at intervals along the length of the second sliding rod 24. The plurality of first extrusion bars 231 and the plurality of second extrusion bars 241 are arranged in an alternating manner, and an extrusion zone 25 is formed between adjacent first extrusion bars 231 and second extrusion bars 241. The surface of the first extrusion bar 231 is provided with a first through-hole 232 for the second sliding rod 24 to pass through, and the surface of the second extrusion bar 241 is provided with a second through-hole 242 for the first sliding rod 23 to pass through.

[0044] Reference Figure 7 、 Figure 9 The hopper 2 is provided with a first driving assembly 6, which is used to drive the first sliding rod 23 and the second sliding rod 24 to slide to expand or shrink the extrusion area 25; the first driving assembly 6 includes a first driving disk 61, a second driving disk 62, a first sliding frame 63 and a second sliding frame 64, and the first driving disk 61 and the second driving disk 62 are respectively connected to different rotating shafts 3, and the rotation direction of the rotating shaft 3 of the first driving disk 61 is opposite to that of the rotating shaft 3 of the second driving disk 62.

[0045] One end of the first sliding rod 23 passes through the hopper 2 and is fixedly connected to the first sliding frame 63. A first eccentric column 611 is rotatably installed on the surface of the first driving disk 61. The first sliding frame 63 has a first guide groove 631 for the first eccentric column 611 to be embedded. Both ends of the first guide groove 631 are extended along the height direction; one end of the second sliding rod 24 passes through the hopper 2 and is fixedly connected to the second sliding frame 64. A second eccentric column 621 is rotatably installed on the surface of the second driving disk 62. The second sliding frame 64 has a second guide groove 641 for the second eccentric column 621 to be embedded. Both ends of the second guide groove 641 are extended along the height direction.

[0046] The implementation principle of Example 3 of the present application is: a combination of multiple first extrusion bars 231 and multiple second extrusion bars 241 forms multiple extrusion areas 25, and the first drive disk 61 and the second drive disk 62 are respectively arranged on two rotating shafts 3 with opposite rotation directions, so that when the rotating shaft 3 rotates, it can drive the first drive disk 61 and the second drive disk 62 to rotate in opposite directions, thereby making the sliding direction of the first sliding rod 23 and the sliding direction of the second sliding rod 24 opposite.

[0047] The effect achieved is that when one squeezing zone 25 expands, the adjacent squeezing zone 25 shrinks. The shrinking squeezing zone 25 squeezes the powder, improving the agglomeration breakup effect. The expanding squeezing zone 25 allows the powder in the breakup space 21 to fall into it, allowing the powder to be squeezed and dropped simultaneously (i.e., when the first squeezing bars 231 and the second squeezing bars 241 slide, if one squeezing zone 25 shrinks, another squeezing zone 25 expands). This allows the powder to continuously fall to the feed port of the elevator 1, ensuring the conveying efficiency of the elevator 1.

[0048] Example 4: This embodiment of the present application discloses a powder conveying device.

[0049] The powder conveying device disclosed in the embodiment of the present application differs from that in embodiment 3 in that: Reference Figure 10 In this embodiment, the thickness of the first extruded strip 231 gradually decreases from top to bottom, and a heating plate (not shown in the figure) is embedded in the interior of the first extruded strip 231 and the interior of the second extruded strip 241. The heating plate is an electric heating plate. The wires of the heating plate inside the first extruded strip 231 can be led out through the first sliding rod 23 to connect to the power supply (that is, a hole for the power supply line to pass through needs to be opened inside the first sliding rod 23), and the wires of the heating plate inside the second extruded strip 241 can be led out through the second sliding rod 24 to connect to the power supply (that is, a hole for the power supply line to pass through needs to be opened inside the second sliding rod 24).

[0050] In other embodiments, cavities may be opened inside the first extrusion strip 231 and on the inner wall of the second extrusion strip 241 , and a heating medium (such as hot water) may be introduced into the cavities to adjust the temperature in the extrusion zone 25 .

[0051] Reference Figure 10 A third sliding rod 26 and a fourth sliding rod 27 are respectively slidably installed in the extrusion space 22. Both ends of the third sliding rod 26 and the fourth sliding rod 27 are extended in the horizontal direction. The third sliding rod 26 is fixedly connected to a plurality of third extrusion bars 261, and the plurality of third extrusion bars 261 are arranged at intervals along the length direction of the third sliding rod 26. The fourth sliding rod 27 is fixedly connected to a plurality of fourth extrusion bars 271, and the plurality of fourth extrusion bars 271 are arranged at intervals along the length direction of the fourth sliding rod 27; the plurality of third extrusion bars 261 and the plurality of fourth extrusion bars 271 are arranged in an staggered manner, and a falling area 28 is formed between adjacent third extrusion bars 261 and fourth extrusion bars 271.

[0052] The number of drop zones 28 corresponds to the number of squeeze zones 25, and each drop zone 28 is located below the corresponding squeeze zone 25. The hopper 2 is provided with a second drive assembly 7, which is used to drive the third sliding rod 26 and the fourth sliding rod 27 to slide to expand or contract the drop zones 28. When the squeeze zone 25 expands, the second drive assembly 7 forces the corresponding drop zone 28 to contract, and when the squeeze zone 25 contracts, the second drive assembly 7 forces the corresponding drop zone 28 to expand.

[0053] Reference Figure 10 The second driving assembly 7 includes a first rack 71, a second rack 72, a third rack 73, a fourth rack 74, a first linkage member and a second linkage member. One end of the first sliding rod 23 extends out of the hopper 2 and is fixedly connected to one end of the first rack 71, one end of the second sliding rod 24 extends out of the hopper 2 and is fixedly connected to one end of the second rack 72, one end of the third sliding rod 26 extends out of the material head and is fixedly connected to one end of the third rack 73, and one end of the fourth sliding rod 27 extends out of the hopper 2 and is fixedly connected to one end of the fourth rack 74.

[0054] The first linkage member is arranged between the first rack 71 and the third rack 73 to drive the first rack 71 and the third rack 73 to slide in the same direction, and the second linkage member is arranged between the second rack 72 and the fourth rack 74 to drive the second rack 72 and the fourth rack 74 to slide in the same direction; the structures of the first linkage member and the second linkage member are the same, and the structure of the first linkage member is explained below as an example, and the structure of the second linkage member can be obtained similarly.

[0055] A support plate 29 is fixedly installed on the side wall of the hopper 2, and the first linkage member includes a first gear 75 and a second gear 76. The first gear 75 and the second gear 76 are both rotatably installed on the support plate 29. The first gear 75 and the second gear 76 are meshed for transmission, the first gear 75 and the first rack 71 are meshed for transmission, and the second gear 76 and the third rack 73 are meshed for transmission, so that when the first sliding rod 23 slides, the third sliding rod 26 can slide in the same direction as the first sliding rod 23.

[0056] It should be noted that in this embodiment, the outer diameter of the first gear 75 is smaller than the outer diameter of the second gear 76. By controlling the transmission ratio between the first gear 75 and the second gear 76, when the first sliding rod 23 drives the third sliding rod 26 to slide in the same direction, the sliding amount of the third sliding rod 26 is smaller than the sliding amount of the first sliding rod 23. In other embodiments, the third sliding rod 26 and the fourth sliding rod 27 can also be driven by a cylinder.

[0057] The implementation principle of Example 4 of the present application is as follows: the provision of the third extrusion bar 261 and the fourth extrusion bar 271 can further squeeze the small-sized lumps remaining in the powder material, thereby improving the effect of breaking up the lumps. Secondly, when the extrusion area 25 is expanded, the corresponding drop zone 28 is reduced, thereby forming a shield for the bottom of the expanded extrusion area 25, slowing down the falling speed of the powder material in the expanded extrusion area 25, increasing the retention time of the lumps in the expanded extrusion area 25, and reducing the possibility that the lumps fall too fast and cannot be squeezed by the first extrusion bar 231 and the second extrusion bar 241, and also helping to evaporate the moisture in the lumps. Thirdly, when the extrusion area 25 is reduced, the corresponding drop zone 28 is expanded, and the expanded drop zone 28 can facilitate the rapid falling of the powder material extruded in the reduced extrusion area 25 above.

[0058] Example 5: This application also discloses a process for preparing calcium carbonate.

[0059] A calcium carbonate preparation process specifically comprises the following steps: S1. Pretreatment: a. Grind the calcium carbonate raw material to produce powder; b. The powder is classified by the powder selector, and the powder that meets the fineness requirements enters the cyclone collector with the air flow for preliminary separation. Some finished powder is directly discharged through the discharge valve; the air flow containing trace dust (calcium carbonate dust) is led to the dust collector, and the clean air after filtration is discharged, and the collected dust is incorporated into the main process.

[0060] S2. Conveying and storage: a. The collected powder is conveyed to the storage tank via the screw elevator 1. The speed of the lifting process is controlled to avoid powder accumulation or blockage. b. The powder enters the silo through the feed port on the top of the storage tank. The filling height of the storage tank is monitored in real time by the level meter. The feed valve is closed when the set value is reached.

[0061] The above are preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A powder material conveying device, comprising an elevator (1) and a hopper (2) arranged at a feed port of the elevator (1), characterized in that: The hopper (2) has a dispersing space (21) inside, and a plurality of rotating shafts (3) are rotatably installed in the dispersing space (21). Each of the rotating shafts (3) is connected to a plurality of dispersing rods (31), and the plurality of dispersing rods (31) are arranged at intervals around the central axis of the rotating shaft (3); the plurality of dispersing rods (31) of the rotating shaft (3) are surrounded to form a dispersing area (32), and the dispersing areas (32) of two adjacent rotating shafts (3) partially overlap to form a gathering area (321); the hopper (2) is provided with a rotating assembly (4) for driving all the rotating shafts (3) to rotate.

2. A powder conveying device according to claim 1, characterized in that: The rotating assembly (4) comprises a rotating gear (41) and a rotating motor. The number of the rotating gears (41) is arranged corresponding to the number of the rotating shafts (3). One end of each rotating shaft (3) passes through the hopper (2) and is coaxially connected to the corresponding rotating gear (41). Two adjacent rotating gears (41) are meshed and driven. The rotating motor is arranged on the side wall of the hopper (2), and the output shaft of the rotating motor is connected to one of the rotating shafts (3).

3. A powder conveying device according to claim 1, characterized in that: A connecting bar (33) is provided between each of the breaking rods (31) and the rotating shaft (3), one end of the connecting bar (33) is connected to the rotating shaft (3), and the other end is connected to the breaking rod (31), and the breaking rod (31) is connected to the rotating shaft (3) via the connecting bar (33); a vibration component (5) for causing the breaking rod (31) to vibrate is provided in the breaking space (21).

4. A powder conveying device according to claim 3, characterized in that: Each of the scattering rods (31) is rotatably connected to the corresponding connecting strip (33), and a return torsion spring (331) is provided between the scattering rod (31) and the corresponding connecting strip (33); the vibration assembly (5) comprises an abutting rod (51) and an abutting plate (52), the abutting rod (51) is arranged in the gathering area (321), and one end of the abutting plate (52) is connected to the outer peripheral wall of the scattering rod (31); under normal conditions, the return torsion spring (331) forces the free end of the abutting plate (52) to rotate toward the center of the corresponding scattering area (32); when the scattering rod (31) rotates into the adjacent scattering area (32), the abutting plate (52) abuts against the abutting rod (51) in the gathering area (321), and forces the return torsion spring (331) to deform.

5. The powder conveying device according to claim 1, characterized in that: The hopper (2) has an extrusion space (22) inside, and the extrusion space (22) is located below the breaking up space (21); a first sliding rod (23) and a second sliding rod (24) are respectively slidably installed in the extrusion space (22), the first sliding rod (23) is connected to a plurality of first extrusion bars (231), and the second sliding rod (24) is connected to a plurality of second extrusion bars (241), the plurality of first extrusion bars (231) and the plurality of second extrusion bars (241) are arranged in a staggered manner, and an extrusion area (25) is formed between adjacent first extrusion bars (231) and second extrusion bars (241); the hopper (2) is provided with a first driving component (6), and the first driving component (6) is used to drive the first sliding rod (23) and the second sliding rod (24) to slide, so as to expand or reduce the extrusion area (25).

6. A powder material conveying device according to claim 5, characterized in that: The first driving assembly (6) comprises a first driving disc (61), a second driving disc (62), a first sliding frame (63) and a second sliding frame (64); the first driving disc (61) and the second driving disc (62) are respectively connected to different rotating shafts (3), and the rotating shaft (3) of the first driving disc (61) and the rotating shaft (3) of the second driving disc (62) have opposite rotation directions; one end of the first sliding rod (23) passes through the hopper (2) and is connected to the first sliding frame (63), and one end of the second sliding rod (24) passes through the hopper (2) and is connected to the second sliding frame (64); a first eccentric column (611) is provided on the surface of the first driving disc (61), the first sliding frame (63) has a first guide groove (631) for the first eccentric column (611) to be embedded, a second eccentric column (621) is provided on the surface of the second driving disc (62), and the second sliding frame (64) has a second guide groove (641) for the second eccentric column (621) to be embedded.

7. The powder conveying device according to claim 5, characterized in that: The thickness of the first extruded strip (231) gradually decreases from top to bottom.

8. The powder conveying device according to claim 5, characterized in that: Heating plates are embedded in the interior of the first extrusion strip (231) and the interior of the second extrusion strip (241).

9. The powder conveying device according to claim 5, characterized in that: A third sliding rod (26) and a fourth sliding rod (27) are respectively slidably installed in the extrusion space (22); the third sliding rod (26) is connected to a plurality of third extrusion bars (261); the fourth sliding rod (27) is connected to a plurality of fourth extrusion bars (271); the plurality of third extrusion bars (261) and the plurality of fourth extrusion bars (271) are arranged in a staggered manner; a drop zone (28) is formed between adjacent third extrusion bars (261) and fourth extrusion bars (271); the hopper (2) is provided with a The second driving assembly (7) is used to drive the third sliding rod (26) and the fourth sliding rod (27) to slide so as to expand or shrink the falling area (28); the number of the falling areas (28) is set corresponding to the number of the squeezing areas (25), and each of the falling areas (28) is located below the corresponding squeezing area (25). When the squeezing area (25) expands, the corresponding falling area (28) shrinks, and when the squeezing area (25) shrinks, the corresponding falling area (28) expands.

10. A process for preparing calcium carbonate, based on a powder conveying device according to any one of claims 1 to 9, comprising the following steps: S1. Pretreatment: Grinding the calcium carbonate raw material to obtain powder; S2. Transportation and storage: The powder is transported to a storage tank via an elevator (1) for storage.

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