Coal lump breaking apparatus for coal detection

Abstract

This application relates to a coal lumps crushing device for coal testing, belonging to the field of crushing equipment. It includes a feeding conveyor belt, a crushing device, a discharging conveyor belt, and a cleaning device. The cleaning device includes an axial reciprocating movement assembly, a rotation drive assembly, a negative pressure pipe, a metal mesh cylinder, and two vertically arranged drop pipes. A filter screen is fitted around the outer circumference of the metal mesh cylinder, and rubber strips are adhered to the surface of the filter screen. The surface of the rubber strips has bristles. The upper ends of the drop pipes are fixedly connected to receiving pipes coaxially arranged with the metal mesh cylinder, and the area between the two receiving pipes is designated as the cleaning zone. The chambers of the metal mesh cylinder located within the two sealed discs are designated as negative pressure chambers. The rotation drive assembly drives the metal mesh cylinder to rotate, and the axial reciprocating movement assembly drives the metal mesh cylinder to move axially back and forth to enter the cleaning zone or the receiving pipe. This application can improve the coal ash cleaning effect.

Description

Technical Field

[0001] This application relates to the field of crushing equipment, and in particular to a coal block crushing device for coal testing. Background Technology

[0002] When testing coal quality, crushing equipment is needed to first crush the coal blocks to obtain coal particles with a small to medium mesh size, and then pulverizing equipment is used to pulverize the coal particles into coal powder with a small mesh size.

[0003] The crushing equipment includes a feeding conveyor belt, a crushing device, and a discharge conveyor belt. The feeding conveyor belt is used to transport coal blocks of the same batch to the crushing device, the crushing device is used to crush the coal blocks into coal particles, and the discharge conveyor belt is used to transport the crushed coal particles to the receiving bucket.

[0004] There is often a lot of coal ash left on the discharge conveyor belt. In order to clean the coal ash left on the discharge conveyor belt, a brush roller is installed under the discharge conveyor belt. The brush roller is in contact with the surface of the discharge conveyor belt to scrape off the coal ash. However, when there is a lot of coal ash, it is easy to cause coal ash to fly and pollute the on-site environment. Summary of the Invention

[0005] To improve the coal ash cleaning effect, this application provides a coal block crushing device for coal testing.

[0006] This application provides a coal lump crushing device for coal testing, which adopts the following technical solution:

[0007] A coal crushing device for coal testing includes a feeding conveyor belt, a crushing device, a discharge conveyor belt, and a cleaning device. The discharge end of the feeding conveyor belt is connected to the feed end of the crushing device, and the discharge end of the crushing device is connected to the feed end of the discharge conveyor belt. The cleaning device is used to clean coal ash from the surface of the discharge conveyor belt. The cleaning device includes an axial reciprocating moving assembly, a rotation drive assembly, a negative pressure pipe, a metal mesh cylinder, and two vertically arranged drop pipes. The metal mesh cylinder extends along the width direction of the discharge conveyor belt, and its length is greater than twice the width of the discharge conveyor belt. A filter mesh is fitted on the outer circumference of the metal mesh cylinder, and multiple circumferentially evenly arranged rubber strips are adhered to the surface of the filter mesh. The surface of the rubber strips is provided with bristles. The outer peripheral end is coaxially fixed with an anti-detachment ring to limit the axial movement of the rubber strip; the upper end of each drop tube is fixedly connected to a receiving tube coaxially arranged with the metal mesh cylinder, and the lower ends of the two drop tubes are connected to a recycling tank, with the area between the two receiving tubes designated as a clean zone; the receiving tube is fixed with two sealing discs located inside the metal mesh cylinder, and the chamber of the metal mesh cylinder located in the two sealing discs is designated as a negative pressure chamber, the length of which is equal to the width of the discharge conveyor belt, and the negative pressure chamber is located in the clean zone; the negative pressure pipe is fixedly connected to the metal mesh cylinder and communicates with the negative pressure chamber; the rotation drive assembly is used to drive the metal mesh cylinder to rotate, and the axial reciprocating movement assembly is used to drive the metal mesh cylinder to move axially reciprocally to enter the clean zone or the receiving tube.

[0008] By adopting the above technical solution, during cleaning, the negative pressure pipe generates negative pressure in the negative pressure chamber. Under the action of negative pressure, the filter cloth fits more closely to the metal mesh cylinder, and the friction between the two increases. The rotation drive component drives the metal mesh cylinder to rotate, and the metal mesh cylinder drives the filter cloth and brush bristles to rotate through friction, so as to brush off the coal ash on the discharge conveyor belt. Furthermore, due to the continuous suction of the negative pressure chamber, the brushed-off coal ash will be quickly adsorbed on the surface of the filter cloth, thereby reducing the diffusion and pollution of coal ash.

[0009] At the same time, the axial reciprocating component drives the metal mesh cylinder to move axially back and forth to enter the receiving tube, so that the part of the filter cloth that is full of coal ash can enter the receiving tube (while the part of the filter cloth that is not full of coal ash enters the clean area from the receiving tube to perform the adsorption action). At this time, there is no negative pressure on the part of the filter cloth located in the receiving tube. Under the action of centrifugal force and gravity, the coal ash in this part will enter the recovery tank through the drop pipe.

[0010] By setting a sealing disc to separate the negative pressure chamber inside the metal mesh cylinder, and fixing the sealing disc to the receiving tube, the metal mesh cylinder and the filter cloth move axially relative to the sealing disc. This means that the negative pressure chamber is always located within the clean zone, thus ensuring that the part of the filter cloth located in the receiving tube does not come into contact with the negative pressure chamber. In other words, the coal ash in this part is relatively loose and easily falls into the drop pipe, thereby ensuring the clean recovery effect of the coal ash.

[0011] By incorporating anti-detachment rings, the occurrence of filter mesh detaching from the metal mesh cylinder due to belt friction is reduced.

[0012] Optionally, the rotation drive assembly includes a first motor and a first gear. The negative pressure tube is rotatably connected to the receiving tube and is coaxially arranged with the metal mesh cylinder. One end of the negative pressure tube is closed, and the other end has an opening. The open end of the negative pressure tube is provided with a rotary joint and a soft suction tube. The negative pressure tube passes through the sealing disc. A branch tube is fixed in the middle of the negative pressure tube and is located in the negative pressure chamber. The branch tube is fixedly connected to the inner wall of the metal mesh cylinder and has multiple suction holes. The outer circumferential surface of the negative pressure tube has a protruding strip-shaped tooth structure that extends axially along the negative pressure tube. The first motor is installed on the falling tube, and the first gear is installed on the output shaft of the first motor. The first gear meshes with the strip-shaped tooth.

[0013] By adopting the above technical solution, a branch pipe is set to achieve a fixed connection between the negative pressure pipe and the metal mesh cylinder. The first gear and the strip-shaped convex tooth are used to drive the negative pressure pipe to rotate, thereby driving the metal mesh cylinder and the filter cloth to rotate.

[0014] Optionally, the axial reciprocating moving assembly includes a second motor, a second gear, and a rack. The rack has a square cross-section and is axially slidably connected to the receiving tube. One end of the rack is rotatably connected to the end of the negative pressure tube. The second motor is mounted on the falling tube, and the second gear is mounted on the output shaft of the second motor. The second gear meshes with the rack.

[0015] By adopting the above technical solution, the negative pressure pipe is driven to move axially back and forth through the meshing of the second gear and rack and the forward and reverse rotation of the second motor.

[0016] By setting the cross-section of the rack, the rack engages with the end of the receiving tube, preventing the rack from rotating. This ensures that the tooth surface of the rack always faces downwards, and the orientation of the tooth surface will not change due to the rotation of the negative pressure tube, thus ensuring that the rack and the second gear remain in mesh.

[0017] Optionally, both ends of the metal mesh cylinder are fixed with end caps, and the area between the end caps and the sealing disc in the inner cavity of the metal mesh cylinder is designated as a positive pressure chamber. A sleeve is fixed inside the receiving tube, and the sleeve is fitted onto the negative pressure tube. The sleeve passes through the end caps, and the end of the sleeve is coaxially rotatably connected to the surface of the sealing disc. An air passage is opened inside the sleeve, and one end of the air passage has an air outlet that communicates with the positive pressure chamber. The other end of the air passage is connected to a flexible blowing tube.

[0018] By adopting the above technical solution, when the part of the filter cloth that adsorbs coal ash moves axially into the receiving tube, since the positive pressure chamber is always located in the receiving tube, the soft blowing pipe blows high-pressure gas into the air passage. The high-pressure gas enters the positive pressure chamber through the air outlet and blows from the inside to the outside to the inner circumference of the filter cloth, so as to backflush the coal ash off the filter cloth. The coal ash then enters the recovery tank through the drop pipe, thereby reducing the coal ash residue on the filter cloth and ensuring the effectiveness of the next belt cleaning.

[0019] Optionally, the receiving tube is fixed with two end caps by a support rod. The outer circumferential surface of the end caps fits against the inner circumferential surface of the metal mesh cylinder. The area between the end caps and the sealing disc in the inner cavity of the metal mesh cylinder is designated as a positive pressure chamber. A sleeve is fixed inside the receiving tube and is fitted onto the negative pressure tube. The sleeve passes through the end caps, and the end of the sleeve is coaxially rotatably connected to the surface of the sealing disc. An air passage is provided inside the sleeve. One end of the air passage has an air outlet that communicates with the positive pressure chamber, and the other end of the air passage is connected to a flexible air blowing tube.

[0020] By adopting the above technical solution, since the end cap and the sealing plate are both fixed relative to the receiving tube, the distance between the end cap and the sealing plate is fixed, that is, the volume and air pressure of the positive pressure chamber are constant. This ensures that when the filter cloth moves axially and passes through the positive pressure chamber, the high-pressure gas in the positive pressure chamber will act evenly on the coal ash of the filter cloth, thereby improving the backwashing effect on the coal ash.

[0021] Optionally, both of the drop tubes are fixed with a through rod, and the through rod is rotatably connected to a swing rod, with a torsion spring between the through rod and the swing rod; when the end of the metal mesh cylinder moves axially to a position away from the cleaning area of ​​the receiving tube, the upper end of the swing rod is located between two adjacent bristles, and when the bristles move circumferentially relative to the swing rod, the swing rod elastically deflects and forces the rubber strip to elastically offset around the axis of the metal mesh cylinder.

[0022] By adopting the above technical solution, when the end of the metal mesh cylinder moves axially to a position away from the clean zone in the receiving tube, that is, the part of the filter cloth that is fully adsorbed with coal ash completely enters the receiving tube and the negative pressure chamber, this part is designated as the first part, while the part of the filter cloth that is not adsorbed with coal ash completely enters the clean zone and the positive pressure chamber, and this part is designated as the second part. Due to the negative pressure, the second part fits the metal mesh cylinder more closely, and the friction is greater, so the second part is less likely to deflect relative to the metal mesh cylinder. Due to the positive pressure, the friction between the first part and the metal mesh cylinder is smaller, so the first part is more likely to deflect relative to the metal mesh cylinder.

[0023] At this time, when the brush bristles move circumferentially relative to the swing arm, the brush bristles interfere with the upper end of the swing arm, the swing arm deflects elastically and forces the rubber strip to shift elastically around the axis of the metal mesh cylinder. The rubber strip then causes the first part of the filter cloth to shift relative to the second part around the axis of the metal mesh cylinder, that is, the first part is twisted. At this time, the angle between the mesh of the first part and the mesh of the metal mesh cylinder changes, that is, the blowing angle of the high-pressure gas changes with the mesh of the first part, so that the first part can be backwashed from different angles, thereby improving the backwashing effect of coal ash and reducing the residue of stubborn coal ash.

[0024] Secondly, when the rubber strip elastically resets, the first part resets. During this process, the first part continuously twists and resets, generating vibration, thereby shaking off the coal ash more quickly.

[0025] Optionally, the upper end of the swing arm has a guide surface for the ends of the bristles to abut against, thereby forcing the rubber strip to flex elastically along its own length.

[0026] By adopting the above technical solution, when the brush bristles move circumferentially relative to the swing arm, the brush bristles interfere with the upper end of the swing arm, the swing arm deflects elastically and forces the rubber strip to shift elastically around the axis of the metal mesh cylinder. The rubber strip then drives the first part of the filter cloth to shift relative to the second part around the axis of the metal mesh cylinder. During this process, the guide surface of the swing arm also abuts against the end of the brush bristles. The elastic force of the swing arm is converted into an axial force along the brush bristles through the guide surface. This force will force the rubber strip to bend elastically along its own length, thereby forcing the second part to wrinkle axially relative to the metal mesh cylinder, further increasing the shaking amplitude of the second part, thereby improving the removal effect of coal ash.

[0027] Optionally, one end of the recycling tank is provided with a side opening, and an upward-facing pull-out box is slidably disposed inside the recycling tank.

[0028] By adopting the above technical solution, the coal ash falling into the drop tube will fall into the pull-out box. After the pull-out box has been collected, it can be removed from the recycling tank through the side opening by sliding the pull-out box, which is convenient and quick.

[0029] Optionally, the outer side of the discharge conveyor belt is fixed with an escape prevention cover.

[0030] By adopting the above technical solutions, the occurrence of coal ash leakage during the conveyor belt transport of crushed coal particles can be reduced.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] By setting up an axial reciprocating moving component, a rotation drive component, a negative pressure pipe, a metal mesh cylinder, a receiving pipe, and a recovery tank, the metal mesh cylinder drives the filter cloth and brushes to rotate through friction, brushing off the coal ash on the discharge conveyor belt. Due to the continuous suction of the negative pressure chamber, the brushed-off coal ash will be quickly adsorbed onto the surface of the filter cloth, thereby reducing the diffusion and pollution of coal ash. The axial reciprocating component drives the metal mesh cylinder to move axially and reciprocally to enter the receiving pipe, so that the part of the filter cloth that is full of coal ash can enter the receiving pipe (at the same time, the part of the filter cloth that is not full of coal ash enters the clean area from the receiving pipe to perform the adsorption action). At this time, the part of the filter cloth located in the receiving pipe has no negative pressure. Under the action of centrifugal force and gravity, the coal ash in this part will enter the recovery tank through the falling pipe.

[0033] By setting up a positive pressure chamber, which is always located inside the receiving tube, high-pressure gas is blown into the air passage through the soft blowing pipe. The high-pressure gas enters the positive pressure chamber through the air outlet and is blown from the inside to the outside to the inner circumference of the filter cloth, so as to backflush the coal ash from the filter cloth. The coal ash then enters the recovery tank through the drop pipe, thereby reducing the coal ash residue on the filter cloth and ensuring the effectiveness of the next belt cleaning.

[0034] By setting up a swing arm that can be deflected by a spring, a second part with high friction and a first part with low friction, the swing arm deflects elastically and forces the rubber strip to shift elastically around the axis of the metal mesh cylinder. The rubber strip then causes the first part of the filter cloth to shift relative to the second part around the axis of the metal mesh cylinder, that is, the first part is twisted. At this time, the angle between the mesh of the first part and the mesh of the metal mesh cylinder changes, that is, the blowing angle of the high-pressure gas changes with the mesh of the first part. This allows the first part to be backwashed from different angles, thereby improving the backwashing effect of coal ash and reducing the residue of stubborn coal ash. Attached Figure Description

[0035] Figure 1 This is a top view of the overall structure of Embodiment 1.

[0036] Figure 2 This is a partial cross-sectional view of Embodiment 1, showing the discharge end of the discharge conveyor belt.

[0037] Figure 3 This is a cross-sectional view of the metal mesh cylinder of Example 1.

[0038] Figure 4 This is a cross-sectional view of the cleaning device of Example 1 along the longitudinal section of the metal mesh cylinder.

[0039] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0040] Figure 6 yes Figure 4A magnified view of a section at point B in the middle.

[0041] Figure 7 yes Figure 4 A magnified view of a section at point C.

[0042] Figure 8 yes Figure 4 A magnified view of a section at point D.

[0043] Figure 9 yes Figure 4 A magnified view of a section at point E in the middle.

[0044] Figure 10 This is a cross-sectional view of the cleaning device of Example 2 along the longitudinal section of the metal mesh cylinder.

[0045] Figure 11 This is a partial cross-sectional view of Embodiment 2 showing the location of the vents.

[0046] Figure 12 yes Figure 10 A magnified view of a section at point F.

[0047] Figure 13 This is a cross-sectional view of the cleaning device of Example 3 along the longitudinal section of the metal mesh cylinder.

[0048] Figure 14 yes Figure 13 A magnified view of a section at point G.

[0049] Figure 15 This is a cross-sectional view of the cleaning device of Example 4 along the longitudinal section of the metal mesh cylinder.

[0050] Figure 16 yes Figure 15 A magnified view of a section at point H.

[0051] Figure 17 This is a schematic diagram of Example 4 used to illustrate the positional relationship between the brush bristles and the upper end of the swing arm.

[0052] Figure 18 This is a schematic diagram of Example 5 illustrating the fit between the brush tip and the upper end of the swing arm.

[0053] Explanation of reference numerals in the attached drawings: 1. Metal mesh cylinder; 2. Drop pipe; 3. Negative pressure pipe; 10. Cleaning area; 100. Feed conveyor belt; 110. Negative pressure chamber; 120. Positive pressure chamber; 101. Crushing device; 102. Discharge conveyor belt; 1021. Belt; 1022. Anti-escape cover; 103. Receiving bucket; 105. Cleaning device; 11. Filter cloth; 171. Ring groove; 12. Rubber strip; 13. Brush bristles; 15. End cap; 151. Support rod; 16. Anti-detachment ring; 17. Sealing disc; 18. Sleeve 181. Airway; 182. Air outlet; 19. Flexible air blowing tube; 21. Receiving tube; 22. Recovery tank; 221. Side opening; 23. Pull-out box; 25. Inclined plate; 251. Front baffle; 252. Rear baffle; 26. Through rod; 27. Swing rod; 271. Guide surface; 28. Torsion spring; 31. Branch tube; 311. Intake hole; 32. Strip-shaped tooth; 33. Rotary joint; 34. Flexible intake tube; 51. First motor; 52. First gear; 53. Second gear; 55. Rack. Detailed Implementation

[0054] The following is in conjunction with the appendix Figure 1 - Appendix Figure 18 This application will be described in further detail.

[0055] Example 1 discloses a coal crushing device for coal testing. (Refer to...) Figure 1 and Figure 2 The coal crushing equipment for coal testing includes a feeding conveyor belt 100, a crushing device 101, a discharge conveyor belt 102, a receiving bucket 103, and a cleaning device 105. The discharge end of the feeding conveyor belt 100 is connected to the feed end of the crushing device 101, and the discharge end of the crushing device 101 is connected to the feed end of the discharge conveyor belt 102. The discharge conveyor belt 102 is a belt conveyor, and the discharge end of the discharge conveyor belt 102 is higher than the feed end of the discharge conveyor belt 102. The receiving bucket 103 is located directly below the discharge end of the discharge conveyor belt 102 to receive the crushed coal particles.

[0056] Furthermore, an escape shield 1022 can be fixedly installed on the outside of the discharge conveyor belt 102 to reduce the occurrence of coal ash leakage during the process of the discharge conveyor belt 102 conveying crushed coal particles.

[0057] like Figure 2 , Figure 3 , Figure 4 As shown, the cleaning device 105 is used to clean the coal ash on the surface of the belt 1021 of the discharge conveyor belt 102. Specifically, the cleaning device 105 includes an axial reciprocating moving assembly, a rotation drive assembly, a negative pressure pipe 3, a metal mesh cylinder 1, and two vertically arranged drop pipes 2.

[0058] Both drop pipes 2 are located below the discharge conveyor belt 102, and the two drop pipes 2 are symmetrically arranged with the discharge conveyor belt 102 as the center. The upper end of each drop pipe 2 is fixed with a receiving pipe 21, which is connected to the drop pipe 2. The axis of the receiving pipe 21 extends along the width direction of the discharge conveyor belt 102. The area between the two receiving pipes 21 is designated as the cleaning zone 10. The cleaning zone 10 is located directly below the discharge conveyor belt 102. One end of the receiving pipe 21 facing the cleaning zone 10 is open, and the other end of the receiving pipe 21 is closed.

[0059] An inclined plate 25 is fixed to the opening of both receiving tubes 21. The inclined plate 25 is located directly below the cleaning area 10. A front baffle 251 and a rear baffle 252 are fixed to the two sides of the inclined plate 25 in the width direction, respectively. The front baffle 251 is lower than the rear baffle 252 and is closer to the receiving hopper 103 than the rear baffle 252.

[0060] The lower ends of the two drop tubes 2 are connected to a strip-shaped recycling tank 22, that is, the drop tubes 2 and the recycling tank 22 are connected. One end of the recycling tank 22 is provided with a side opening 221, and a pull-out box 23 with the opening facing upward is slidably provided inside the recycling tank 22.

[0061] like Figure 3 , Figure 5 , Figure 6 As shown, the metal mesh cylinder 1 extends along the width direction of the discharge conveyor belt 102. The metal mesh cylinder 1 is coaxially arranged with the receiving tube 21. The length of the metal mesh cylinder 1 is more than twice the width of the discharge conveyor belt 102. A filter mesh cloth 11 is sleeved on the outer circumference of the metal mesh cylinder 1. The filter mesh cloth 11 is cylindrical, and the inner circumference of the filter mesh cloth 11 is attached to the outer circumference of the metal mesh cylinder 1. Multiple rubber strips 12 are bonded to the surface of the filter mesh cloth 11. The rubber strips 12 extend along the axial direction of the filter mesh cloth 11 and are evenly distributed around the circumference of the filter mesh cloth 11. The surface of the rubber strips 12 is provided with bristles 13, which abut against the belt 1021 of the discharge conveyor belt 102. Furthermore, end caps 15 are fixed at both ends of the metal mesh cylinder 1 to seal the ends of the metal mesh cylinder 1.

[0062] Secondly, an anti-detachment ring 16 is coaxially fixed at the end of the outer peripheral surface of the metal mesh cylinder 1, and the two ends of the rubber strip 12 abut against the anti-detachment rings 16 on both sides respectively. The anti-detachment rings 16 are used to restrict the axial movement of the rubber strip 12.

[0063] like Figure 4 , Figure 6As shown, the receiving tube 21 has two sealing discs 17 fixed inside the metal mesh cylinder 1. Specifically, the closed end of the receiving tube 21 is fixed with a sleeve 18, which is coaxially arranged with the metal mesh cylinder 1. The sleeve 18 passes through the end cap 15 to enter the inner cavity of the metal mesh cylinder 1. The sealing disc 17 is made of rubber, and the disc surface of the sealing disc 17 is provided with an annular groove 171. The end of the sleeve 18 is engaged with the annular groove 171, so that the sealing disc 17 and the sleeve 18 are coaxially rotated and engaged. The outer peripheral surface of the sealing disc 17 is attached to the inner peripheral surface of the metal mesh cylinder 1, that is, the sealing disc 17 will separate the inner cavity of the metal mesh cylinder 1. The chamber of the metal mesh cylinder 1 located in the two sealing discs 17 is set as a negative pressure chamber 110. The length of the negative pressure chamber 110 is equal to the width of the discharge conveyor belt 102. The negative pressure chamber 110 is located in the cleaning area 10.

[0064] like Figure 4 , Figure 7 , Figure 8 As shown, the negative pressure pipe 3 is a circular pipe, and the negative pressure pipe 3 is coaxially arranged with the metal mesh cylinder 1. The negative pressure pipe 3 passes through the closed end of the receiving pipe 21, the sleeve 18 and the sealing plate 17 in sequence. The negative pressure pipe 3 can rotate or slide axially relative to the receiving pipe 21. The middle part of the negative pressure pipe 3 is located in the negative pressure cavity 110. A branch pipe 31 is fixed in the middle part of the negative pressure pipe 3. The negative pressure pipe 3 is connected to the branch pipe 31. The branch pipe 31 is fixedly connected to the inner wall of the metal mesh cylinder 1, that is, the negative pressure pipe 3 is fixed to the metal mesh cylinder 1. Furthermore, the branch pipe 31 is provided with multiple air suction holes 311, that is, the negative pressure pipe 3 is connected to the negative pressure cavity 110 through the branch pipe 31.

[0065] One end of the negative pressure tube 3 is closed, and the other end of the negative pressure tube 3 has an opening. The open end of the negative pressure tube 3 is located outside the receiving tube 21. The open end of the negative pressure tube 3 is equipped with a rotary joint 33 and a soft suction tube 34. The soft suction tube 34 can be connected to an external air pump (not shown in the figure).

[0066] like Figure 8 As shown, the rotation drive assembly is used to drive the negative pressure tube 3 and the metal mesh cylinder 1 to rotate. Specifically, the rotation drive assembly includes a first motor 51 and a first gear 52. The outer circumferential surface of the negative pressure tube 3 has protruding strip-shaped teeth 32, which extend axially along the negative pressure tube 3. The strip-shaped teeth 32 are evenly distributed around the circumference, making the outer circumferential surface of the negative pressure tube 3 resemble a gear shaft. The first motor 51 is installed on the outside of the drop tube 2, and the first gear 52 is installed on the output shaft of the first motor 51. The first gear 52 meshes with the strip-shaped teeth 32, thereby transmitting the torque of the first motor 51 to the negative pressure tube 3 to drive the metal mesh cylinder 1 and the filter cloth to rotate.

[0067] like Figure 9As shown, the axial reciprocating moving component is used to drive the metal mesh cylinder 1 to move axially back and forth to enter the cleaning area 10 or the receiving tube 21. The axial reciprocating movement can be continuous, that is, during the rotation of the metal mesh cylinder 1, the axial reciprocating moving component continuously drives the metal mesh cylinder 1 to move axially back and forth. The axial reciprocating movement can also be intermittent, that is, during the rotation of the metal mesh cylinder 1, the axial reciprocating moving component first drives the metal mesh cylinder 1 to a position and then stays for a period of time, and then drives the metal mesh cylinder 1 to move to the next axial position.

[0068] It should be noted that since the sealing disc 17 is fixed to the receiving tube 21, when the metal mesh cylinder 1 and the filter cloth 11 move axially, they will move axially relative to the sealing disc 17, so that the negative pressure chamber 110 is always located within the clean area 10. This ensures that the part of the filter cloth 11 located in the receiving tube 21 does not come into contact with the negative pressure chamber 110, that is, the coal ash in this part is relatively loose and easily falls into the falling pipe 2, thereby ensuring the clean recovery effect of the coal ash.

[0069] Specifically, the axial reciprocating motion assembly includes a second motor, a second gear 53, and a rack 55. The rack 55 has a square cross-section, and its length is axially aligned with the negative pressure pipe 3. The rack 55 passes through a square hole in the closed end of the receiving pipe 21, allowing the rack 55 to slide axially with the receiving pipe 21 and ensuring that the rack 55 cannot rotate, thus ensuring that the tooth surface of the rack 55 always faces downwards. One end of the rack 55 is rotatably connected to the closed end of the negative pressure pipe 3, meaning that the rotation of the negative pressure pipe 3 cannot affect the rack 55, while the sliding of the rack 55 will drive the negative pressure pipe 3 to move axially.

[0070] The second motor is installed on the outside of the falling tube 2 (not shown in the drawing), and the second gear 53 is installed on the output shaft of the second motor. The second gear 53 meshes with the rack 55, that is, by the forward and reverse rotation of the second motor, the negative pressure tube 3 can be driven to move axially back and forth.

[0071] During cleaning, the negative pressure pipe 3 begins to draw in air, causing the negative pressure chamber 110 to generate negative pressure. Under the action of negative pressure, the part of the filter cloth 11 located in the negative pressure chamber 110 fits more closely to the metal mesh cylinder 1, increasing the friction between the two. The rotation drive component drives the metal mesh cylinder 1 to rotate, and the metal mesh cylinder 1, in turn, drives the filter cloth 11 and the brush bristles 13 to rotate through friction, so as to brush off the coal ash on the belt 1021 of the discharge conveyor belt 102. Furthermore, as the negative pressure chamber 110 continues to draw in air, the brushed-off coal ash will be quickly adsorbed onto the surface of the filter cloth 11, thereby reducing the diffusion and pollution of coal ash.

[0072] Meanwhile, the axial reciprocating assembly drives the metal mesh cylinder 1 to move axially back and forth to enter one of the receiving tubes 21, so that the part of the filter cloth 11 that is full of coal ash enters the receiving tube 21 from the clean zone 10 (at the same time, the part of the filter cloth 11 that is not full of coal ash enters the negative pressure chamber 110 and the clean zone 10 from the other receiving tube 21 to perform the adsorption action). At this time, the part of the filter cloth 11 located in the receiving tube 21 has no negative pressure. Under the action of centrifugal force and gravity, the coal ash in this part will enter the pull box 23 in the recycling tank 22 through the drop pipe 2. After the pull box 23 has been collected, the pull box 23 is slid out through the side opening 221 to remove it from the recycling tank 22, which is convenient and quick.

[0073] Example 2 differs from Example 1 in that, as Figure 10 , Figure 11 , Figure 12 As shown, the area between the end cap 15 and the sealing plate 17 in the inner cavity of the metal mesh cylinder 1 is designated as a positive pressure chamber 120. An air passage 181 is provided in the sleeve 18. One end of the air passage 181 is provided with an air outlet 182, which communicates with the positive pressure chamber 120. The other end of the air passage 181 is connected to a flexible air blowing pipe 19. The flexible air blowing pipe 19 is fixedly connected to the closed end of the receiving tube 21. The flexible air blowing pipe 19 is connected to an air pump (not shown in the figure).

[0074] When the part of the filter cloth 11 that adsorbs coal ash moves axially into the receiving pipe 21, since the positive pressure chamber 120 is always located in the receiving pipe 21, the soft blowing pipe 19 blows high-pressure gas into the air passage 181. The high-pressure gas enters the positive pressure chamber 120 through the air outlet 182 and is blown from the inside to the outside to the inner circumference of the filter cloth 11 to backflush the coal ash off the filter cloth 11. The coal ash then enters the recovery tank 22 through the drop pipe 2, thereby reducing the coal ash residue on the filter cloth 11 and ensuring the effectiveness of the next cleaning of the belt 1021.

[0075] Example 3 differs from Example 2 in that, as Figure 13 , Figure 14 As shown, the end cap 15 is separated from the metal mesh cylinder 1. Specifically, the end cap 15 is fixed to the receiving tube 21 by the support rod 151, and the outer circumferential surface of the end cap 15 is in contact with the inner circumferential surface of the metal mesh cylinder 1. That is, when the metal mesh cylinder 1 moves axially, the end cap 15 remains stationary. Since both the end cap 15 and the sealing plate 17 are fixed relative to the receiving tube 21, the distance between the end cap 15 and the sealing plate 17 is fixed. That is, the volume and air pressure of the positive pressure chamber 120 are constant, thereby ensuring that when the filter cloth 11 moves axially and passes through the positive pressure chamber 120, the high-pressure gas in the positive pressure chamber 120 will act evenly on the coal ash of the filter cloth 11, thereby improving the backwashing effect on the coal ash.

[0076] Example 4 differs from Example 2 in that, as Figure 15 , Figure 16 , Figure 17 As shown, both drop tubes 2 are fixed with a through rod 26. The length direction of the through rod 26 is parallel to the axial direction of the metal mesh tube 1. The through rod 26 is rotatably connected to a swing rod 27. The rotation plane of the swing rod 27 is the radial plane of the metal mesh tube 1. A torsion spring 28 is provided between the through rod 26 and the swing rod 27. The elastic force of the torsion spring 28 is used to keep the swing rod 27 in a vertical state.

[0077] When the end of the metal mesh cylinder 1 moves axially to a position in the receiving tube 21 that is far from the clean zone 10, that is, the part of the filter cloth 11 that is fully saturated with coal ash enters the receiving tube 21 and the negative pressure chamber 110, this part of the filter cloth 11 is designated as the first part, while the part of the filter cloth 11 that is not saturated with coal ash enters the clean zone 10 and the positive pressure chamber 120, and this part is designated as the second part. Due to the negative pressure, the second part fits the metal mesh cylinder 1 more closely, and the friction is greater, so the second part is less likely to deflect relative to the metal mesh cylinder 1. Due to the positive pressure, the friction between the first part and the metal mesh cylinder 1 is smaller, so the first part is more likely to deflect relative to the metal mesh cylinder 1.

[0078] When the end of the metal mesh cylinder 1 moves axially to a position away from the clean area 10 of the receiving tube 21, the upper end of the swing rod 27 is located between two adjacent bristles 13. When the bristles 13 move circumferentially relative to the swing rod 27, the bristles 13 interfere with the upper end of the swing rod 27. The swing rod 27 deflects elastically and forces the rubber strip 12 corresponding to the bristles 13 to shift elastically around the axis of the metal mesh cylinder 1. The rubber strip 12 then drives the first part of the filter cloth 11 to shift relative to the second part around the axis of the metal mesh cylinder 1. That is, the first part is twisted. At this time, the angle between the mesh of the first part and the mesh of the metal mesh cylinder 1 changes, that is, the blowing angle of the high-pressure gas changes with the mesh of the first part. Thus, the first part can be backwashed from different angles, thereby improving the backwashing effect of coal ash and reducing the residue of stubborn coal ash.

[0079] Secondly, when the rubber strip 12 elastically resets, the first part resets. Therefore, during the rotation of the metal mesh cylinder 1, the first part continuously twists and resets, generating vibration, thereby shaking off the coal ash more quickly.

[0080] Example 5, the difference between Example 5 and Example 4 is that, as Figure 18 As shown, the upper end of the lever 27 has a guide surface 271.

[0081] When the bristles 13 move circumferentially relative to the swing arm 27, the bristles 13 interfere with the upper end of the swing arm 27. The swing arm 27 deflects elastically and forces the rubber strip 12 to shift elastically around the axis of the metal mesh cylinder 1. The rubber strip 12 then causes the first part of the filter cloth 11 to shift relative to the second part around the axis of the metal mesh cylinder 1. During this process, the guide surface 271 of the swing arm 27 also abuts against the end of the bristles 13. The elastic force of the swing arm 27 is converted into an axial force along the bristles 13 through the guide surface 271. This force will force the rubber strip 12 to bend elastically along its own length, thereby forcing the second part to wrinkle axially relative to the metal mesh cylinder 1, further increasing the shaking amplitude of the second part, thereby improving the removal effect of coal ash.

[0082] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A coal lump crushing device for coal testing, characterized in that: The system includes a feeding conveyor belt (100), a crushing device (101), a discharge conveyor belt (102), and a cleaning device (105). The discharge end of the feeding conveyor belt (100) is connected to the feed end of the crushing device (101), and the discharge end of the crushing device (101) is connected to the feed end of the discharge conveyor belt (102). The cleaning device (105) is used to clean the coal ash from the surface of the belt (1021) of the discharge conveyor belt (102). The cleaning device (105) includes an axial reciprocating moving assembly, a rotation drive assembly, a negative pressure pipe (3), a metal mesh cylinder (1), and two vertically arranged drop pipes (2). The metal mesh cylinder (1) extends along the width of the discharge conveyor belt (102). Extending in the direction, the length of the metal mesh cylinder (1) is more than twice the width of the discharge conveyor belt (102). A filter cloth (11) is fitted on the outer circumference of the metal mesh cylinder (1). Multiple circumferentially evenly arranged rubber strips (12) are bonded to the surface of the filter cloth (11). The surface of the rubber strips (12) is provided with bristles (13). An anti-detachment ring (16) for limiting the axial movement of the rubber strips (12) is coaxially fixed at the end of the outer circumference of the metal mesh cylinder (1). The upper end of each drop pipe (2) is fixedly connected to a receiving pipe (21) coaxially arranged with the metal mesh cylinder (1). The lower ends of the two drop pipes (2) are connected to a recycling tank (22). The area between the two receiving pipes (21) is designated as a clean area. (10); The receiving tube (21) is fixed with two sealing discs (17) located inside the metal mesh cylinder (1). The chambers of the metal mesh cylinder (1) located inside the two sealing discs (17) are set as negative pressure chambers (110). The length of the negative pressure chamber (110) is equal to the width of the discharge conveyor belt (102). The negative pressure chamber (110) is located in the clean area (10). The negative pressure pipe (3) is fixedly connected to the metal mesh cylinder (1) and communicates with the negative pressure chamber (110). The rotation drive assembly is used to drive the metal mesh cylinder (1) to rotate. The axial reciprocating movement assembly is used to drive the metal mesh cylinder (1) to move axially and reciprocally to enter the clean area (10) or the receiving tube (21). The rotation drive assembly includes a first motor (51) and a first gear (52). The negative pressure tube (3) is rotatably connected to the receiving tube (21). The negative pressure tube (3) is coaxially arranged with the metal mesh cylinder (1). One end of the negative pressure tube (3) is closed, and the other end of the negative pressure tube (3) has an opening. The opening end of the negative pressure tube (3) is provided with a rotary joint (33) and a soft suction tube (34). The negative pressure tube (3) passes through the sealing plate (17). A branch tube (31) is fixed in the middle of the negative pressure tube (3). The branch tube (31) is located in the negative pressure chamber (110). The branch tube (31) is fixedly connected to the inner wall of the metal mesh cylinder (1). The branch tube (31) is provided with multiple suction holes (311).The outer circumferential surface of the negative pressure pipe (3) has a protruding strip-shaped tooth (32) that extends axially along the negative pressure pipe (3). The first motor (51) is mounted on the falling pipe (2), and the first gear (52) is mounted on the output shaft of the first motor (51). The first gear (52) meshes with the strip-shaped tooth (32). The axial reciprocating motion assembly includes a second motor, a second gear (53), and a rack (55). The rack (55) has a square cross-section and is axially slidably connected to the receiving pipe (21). One end of the rack (55) is rotatably connected to the end of the negative pressure pipe (3). The second motor is mounted on the falling pipe (2), and the second gear (53) is mounted on the output shaft of the second motor. The second gear (53) meshes with the rack (55).

2. The coal crushing equipment for coal testing according to claim 1, characterized in that: Both ends of the metal mesh cylinder (1) are fixed with end caps (15). The area between the end caps (15) and the sealing disc (17) in the inner cavity of the metal mesh cylinder (1) is designated as a positive pressure chamber (120). A sleeve (18) is fixed inside the receiving tube (21). The sleeve (18) is fitted onto the negative pressure tube (3). The sleeve (18) passes through the end cap (15). The end of the sleeve (18) is coaxially rotatably connected to the surface of the sealing disc (17). An air passage (181) is opened inside the sleeve (18). One end of the air passage (181) is provided with an air outlet (182). The air outlet (182) is connected to the positive pressure chamber (120). The other end of the air passage (181) is connected to a flexible blowing tube (19).

3. The coal briquette crushing equipment for coal testing according to claim 1, characterized in that: The receiving tube (21) is fixed with two end caps (15) by a support rod (151). The outer circumferential surface of the end cap (15) is in contact with the inner circumferential surface of the metal mesh cylinder (1). The area between the end cap (15) and the sealing disc (17) in the inner cavity of the metal mesh cylinder (1) is set as a positive pressure chamber (120). A sleeve (18) is fixed inside the receiving tube (21). The sleeve (18) is sleeved on the negative pressure tube (3). The sleeve (18) passes through the end cap (15). The end of the sleeve (18) is coaxially rotatably connected to the disc surface of the sealing disc (17). An air passage (181) is opened inside the sleeve (18). One end of the air passage (181) is provided with an air outlet (182). The air outlet (182) is connected to the positive pressure chamber (120). The other end of the air passage (181) is connected to a flexible blowing tube (19).

4. The coal briquette crushing equipment for coal testing according to claim 2, characterized in that: Both of the two drop tubes (2) are fixed with a through rod (26), and the through rod (26) is rotatably connected to a swing rod (27). A torsion spring (28) is provided between the through rod (26) and the swing rod (27). When the end of the metal mesh cylinder (1) moves axially to a position away from the cleaning area (10) of the receiving tube (21), the upper end of the swing rod (27) is located between two adjacent bristles (13). When the bristles (13) move circumferentially relative to the swing rod (27), the swing rod (27) is elastically deflected and forces the rubber strip (12) to elastically deflect around the axis of the metal mesh cylinder (1).

5. The coal briquette crushing equipment for coal testing according to claim 4, characterized in that: The upper end of the swing arm (27) has a guide surface (271) for the ends of the bristles (13) to abut against each other to force the rubber strip (12) to bend elastically along its own length.

6. The coal briquette crushing equipment for coal testing according to claim 1, characterized in that: One end of the recycling tank (22) is provided with a side opening (221), and a pull-out box (23) with the opening facing upward is slidably provided inside the recycling tank (22).

7. The coal crushing equipment for coal testing according to claim 1, characterized in that: The outer side of the discharge conveyor belt (102) is covered with a fixed anti-escape cover (1022).

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