Improved single-cone helical ribbon dryer

Abstract

The invention relates to the technical field of drying equipment, in particular to an improved single-cone helical ribbon dryer which comprises a conical shell, a discharging valve is arranged at the bottom end of the conical shell, the discharging valve is an eccentric half-ball valve, an inlet is formed in the upper end of the discharging valve, and a half-ball valve clack is arranged in the discharging valve; a rotor is arranged in the shell, and a driving helical ribbon is mounted on the rotor; a nitrogen back-blowing pipe is arranged at the position, close to the inlet, of the discharging valve, a back-blowing ring is fixed to the inner side wall of the inlet, the interior of the back-blowing ring is divided into an annular buffering cavity through a vertical annular partition plate, the buffering cavity is communicated with the nitrogen back-blowing pipe, a plurality of air outlet holes are formed in the partition plate, and one-way air outlet valves are installed at the air outlet holes. A planetary speed increaser is fixedly arranged below the rotor, the planetary speed increaser is provided with an upper shaft and a lower shaft, the upper shaft is coaxially connected with the rotor, and axial flow fan blades are installed on the lower shaft. The blowing range of bottom materials in the radial direction is enlarged, the axial flow fan blades blow the bottom materials upwards in the axial direction, and the drying effect of the bottom materials is overall improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, and specifically relates to an improved single-cone spiral-ribbon dryer. Background Art

[0002] In the production and processing of anthraquinone, centrifugal washing and drying processes are respectively carried out. Among them, drying is usually carried out by using a single-cone dryer to turn and stir and dry it.

[0003] However, there is a certain distance between the stirring blades of the single-cone dryer and the bottom end of the inner cavity of the dryer. This is because if the stirring blades are in contact with the bottom end of the inner cavity, it will affect the rotation of the stirring blades and the service life of the dryer. However, this distance makes it difficult for the powder material accumulated between the stirring blades and the bottom end of the inner cavity to be turned over, so the material in this area cannot be dried sufficiently, reducing the drying effect of the dryer. The existing dryer is provided with a nitrogen back-blowing mechanism horizontally penetrating through the bottom end of the inner cavity to improve the drying effect of the bottom material. However, the nitrogen back-blowing mechanism is a single-point blowing, and the blowing range is limited, and there are easily blowing dead corners. Therefore, the drying efficiency of the bottom material needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide an improved single-cone spiral-ribbon dryer to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An improved single-cone spiral-ribbon dryer, including a conical shell. A feed valve is provided at the top of the shell, and a discharge valve is provided at the bottom end. The discharge valve is an eccentric hemispherical valve, which has an inlet at the upper end, an outlet at the lower end, and a hemispherical valve flap inside. A rotor is rotatably provided in the shell, and a driving spiral ribbon is installed on the rotor. A driving mechanism connecting the rotor is installed at the top of the shell. A nitrogen back-blowing pipe is horizontally penetrated near the inlet of the discharge valve. When the hemispherical valve flap blocks the inlet, the nitrogen back-blowing pipe faces the top surface of the hemispherical valve flap. An anti-blowing ring is fixedly installed on the inner side wall of the inlet of the discharge valve. The longitudinal section of the anti-blowing ring is in a U-shaped structure. An annular buffer cavity is separated in the anti-blowing ring by a vertical annular partition board. The buffer cavity is communicated with the nitrogen back-blowing pipe. The partition board is provided with a plurality of air outlet holes along its circumferential direction. The plurality of air outlet holes are distributed around the hemispherical valve flap. A one-way air outlet valve is installed at the air outlet hole. A planetary speed increaser is fixedly provided below the rotor. The planetary speed increaser has an upper shaft and a lower shaft. The upper shaft is coaxially connected with the rotor, and axial flow fan blades are installed on the lower shaft.

[0006] Optionally, a mounting hole is provided on the bottom end surface of the rotor, and the upper shaft is connected and fixed to the mounting hole; the upper shaft and the lower shaft are both hollow shafts, and a transmission shaft is fixedly sleeved in the upper shaft, and the transmission shaft passes through the lower shaft to the inlet, and the lower end of the transmission shaft is connected to a scraper, and the scraper is adapted to the semi-arc surface of the hemispherical valve disc along the length direction, and the scraper is provided with a spoiler slope that is low in front and high in the back on one side of the radial movement direction of the transmission shaft, and a pointed scraping blade portion is formed on the front bottom of the spoiler slope; the inner side wall of the partition is provided with air guide slopes on both sides of the air outlet, and the air guide slopes point to the side of the radial movement direction away from the transmission shaft.

[0007] Optionally, a third sleeve for fixing the planetary speed increaser is provided under the rotor, and the lower part of the outer wall of the third sleeve is threadedly connected to an adjustment seat, and the outer wall of the adjustment seat is connected to a plurality of connecting brackets extending outward and downward, and the ends of the plurality of connecting brackets away from the adjustment seat are commonly connected to a conical abutment plate, and the abutment plate is adapted to the inner wall of the shell.

[0008] Optionally, a first sleeve is fixedly sleeved on the lower shaft, the transmission shaft passes through the first sleeve, and the axial flow fan blades are installed on the outer side wall of the lower end of the first sleeve.

[0009] Optionally, the outer side wall of the lower end of the first sleeve is axially slidably and circumferentially rotated with a second sleeve, and the axial fan blades are fixedly connected to the outer side wall of the second sleeve; a V-shaped groove is provided on the lower edge of the second sleeve, and the outer side wall of the lower end of the first sleeve is connected to a drive shaft, and the drive shaft abuts against the lower edge / V-shaped groove of the second sleeve; a limiting ring is connected to the first sleeve, and a compression spring is provided between the second sleeve and the limiting ring.

[0010] Optionally, an insulation jacket is provided on the outer surface of the shell, and the space enclosed between the insulation jacket and the outer surface of the shell is filled with a heating medium, the heating medium is water, a water inlet pipe is provided at the lower part of the insulation jacket, and a water outlet pipe is provided at the upper part of the insulation jacket.

[0011] Optionally, a sampler is provided at the lower portion of the shell, and the sampler is provided through the heat-insulating jacket; a collector and a cleaning pipe are provided at the top of the shell.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a backflush ring at the inlet of the discharge valve of the improved single-cone spiral ribbon dryer. Axial flow fan blades are installed below the rotor through a planetary speed increaser. The backflush ring is provided with multiple air outlet holes distributed in an annular pattern, which increases the radial blowing range of the bottom material. The axial flow fan blades blow the bottom material upward in the axial direction, thereby improving the overall drying effect of the bottom material. 2. The present invention utilizes a coaxial drive rotor to set a transmission shaft and a scraper. The scraper is provided with a spoiler slope and a scraping edge. Air guide slopes are provided on both sides of the air outlet. The provision of the air guide slopes can form a "vortex" of the material at the bottom end of the shell cavity under the backflush of nitrogen. The spoiler slope can lift the "vortex" material in the axial direction, helping the material to be blown up in the axial direction by the axial flow fan blades. The scraper and the axial flow fan blades form a "double-impeller axial flow fan" with opposite rotation directions, which improves the blowing effect and drying efficiency of the bottom end material. 3. This invention features a V-shaped groove at the bottom edge of the second sleeve connecting the axial fan blades. A retaining ring drive shaft is connected to the first sleeve, and a compression spring is interposed between the second sleeve and the retaining ring. When the rotation of the axial fan blades is significantly obstructed, the drive shaft pushes the second sleeve upward and out of the V-shaped groove, thereby reducing the rotational speed of the axial fan blades and preventing damage to the blades due to high shear forces. Furthermore, when the rotor stops and material is being unloaded, the axial fan blades can be pushed to rotate with it, effectively protecting the axial fan blades and ensuring smoother material unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 for Figure 1 Enlarged view of part A in the middle; Figure 3 Schematic diagram of the backflush ring in the present invention; Figure 4 Schematic diagram of the axial flow fan blades in the present invention.

[0014] In the figure: 1. Shell; 101. Feed valve; 102. Discharge valve; 1021. Inlet; 1022. Outlet; 1023. Hemispherical valve disc; 103. Sampler; 104. Cleaning pipe; 105. Nitrogen backflush pipe; 106. Water inlet pipe; 107. Water outlet pipe; 108. Insulation jacket; 2. Collector; 3. Drive mechanism; 301. Drive motor; 302. Motor base; 303. Rotor; 3031. Mounting hole; 304. Drive ribbon; 4. Planetary speed increaser; 401. Upper shaft; 402. Lower shaft; 403. Drive shaft; 5. Axial fan blades; 501. First sleeve; 5011. Limiting ring; 5012. Drive shaft; 502. Second sleeve; 5021. V-groove; 503. Compression spring; 6. Scraper; 601. Turbine slope; 602. Scraping blade; 7. Third sleeve; 701. Adjusting seat; 702. Connecting bracket; 703. Abutment plate; 8. Backflush ring; 801. Partition; 8011. Air outlet; 802. Buffer chamber; 803. Air guide inclined plate. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] Example: Please read Figure 1-4 As shown, an embodiment of the present invention provides an improved single-cone spiral ribbon dryer, comprising a conical shell 1, a feed valve 101 provided at the top of the shell 1, a discharge valve 102 provided at the bottom, an insulation jacket 108 provided on the outer surface of the shell 1, a heating medium filled in the space enclosed between the insulation jacket 108 and the outer surface of the shell 1, and 50°C hot water used as the heating medium to improve the drying efficiency while also avoiding the softening of the material, a sampler 103 and a water inlet pipe 106 provided at the bottom of the insulation jacket 108, and a water outlet pipe 107 provided at the top of the insulation jacket 108, the sampler 103, the water inlet pipe 106 and the water outlet pipe 107 all passing through the insulation jacket 108. A collector 2 and a cleaning pipe 104 are provided at the top of the shell 1.

[0017] Among them, the discharging valve 102 is an eccentric semi-spherical valve. The upper end of the discharging valve 102 is provided with an inlet 1021, the lower end is provided with an outlet 1022, and a semi-spherical valve flap 1023 is arranged inside. A rotor 303 is rotatably arranged in the housing 1, a driving spiral ribbon 304 is installed on the rotor 303, and a driving mechanism 3 for connecting the rotor 303 is installed at the top of the housing 1. The driving mechanism 3 is composed of a driving motor 301 and a motor base 302. The motor base 302 is fixed at the top of the housing 1, the driving motor 301 is installed on the motor base 302, and the shaft of the driving motor 301 penetrates through the motor base 302 and is connected to the rotor 303 through a coupling. A nitrogen back-blowing pipe 105 is horizontally penetrated near the inlet 1021 of the discharging valve 102. When the semi-spherical valve flap 1023 rotates to the upper side and blocks the inlet 1021, the nitrogen back-blowing pipe 105 faces the top surface of the semi-spherical valve flap 1023. An anti-blowing ring 8 is fixedly installed on the inner side wall of the inlet 1021 of the discharging valve 102. The longitudinal section of the anti-blowing ring 8 is in a U-shaped structure. An annular buffer cavity 802 is separated in the anti-blowing ring 8 by a vertical annular partition plate 801. The buffer cavity 802 is connected and communicated with the nitrogen back-blowing pipe 105. At least four air outlet holes 8011 are evenly arranged along the circumferential direction of the partition plate 801. A plurality of air outlet holes 8011 are distributed around the semi-spherical valve flap 1023, and a one-way air outlet valve is installed at the air outlet holes 8011. A planetary speed increaser 4 is fixedly arranged below the rotor 303. The planetary speed increaser 4 is provided with an upper shaft 401 and a lower shaft 402. The rotation directions of the upper shaft 401 and the lower shaft 402 are opposite. The upper shaft 401 is coaxially connected and fixed to the rotor 303, and axial flow fan blades 5 are installed on the lower shaft 402. Through the setting of the anti-blowing ring 8, the original single-point blowing is changed to annular multi-point blowing, increasing the blowing range of the bottom material in the radial direction. By setting the axial flow fan blades 5, the bottom material can be blown upward along the axis. Therefore, the anti-blowing ring 8 and the axial flow fan blades 5 can respectively dry the material at the bottom end of the inner cavity of the housing 1 in the radial and axial directions, improving the drying effect.

[0018] On the basis of the above embodiment, a mounting hole 3031 is opened on the bottom end surface of the rotor 303 , and the upper shaft 401 is fixedly connected to the mounting hole 3031 by a key. The upper shaft 401 and the lower shaft 402 are both hollow shafts. The transmission shaft 403 is fixedly sleeved in the upper shaft 401. The transmission shaft 403 passes through the lower shaft 402 to the inlet 1021. The lower end of the transmission shaft 403 is connected to the scraper 6. The scraper 6 is adapted to the semi-arc surface of the hemispherical valve disc 1023 along the length direction, so the longitudinal cross-section of the scraper 6 along its axis is in the shape of a circular arc. The scraper 6 is provided with a spoiler slope 601 that is low in front and high in the back along the radial movement direction of the transmission shaft 403. A pointed scraping blade portion 602 is formed at the front bottom of the spoiler slope 601, and a distance of 0.5-2 cm is left between the scraping blade portion 602 and the semi-arc surface of the hemispherical valve disc 1023; the inner side wall of the partition 801 is provided with air guide slopes 803 on both sides of the air outlet 8011, and the air guide slopes 803 point to the side of the radial movement direction away from the transmission shaft 403. Therefore, the nitrogen gas blown out through the air outlet 8011 is then directed by the air guide ramp 803 and blown directly toward the rotating scraper 6. On the one hand, the nitrogen gas blown out of at least four air outlets 8011 forms a swirling airflow after being acted upon by the air guide ramp 803. As a result, the material at the bottom of the housing 1 is stirred by this airflow and forms a "swirl," similar to stirring. On the other hand, the turbulent slope 601 axially lifts the "swirling" material, helping it to be blown upward axially by the axial fan blades 5 above. Because the scraper 6 and the axial fan blades 5 rotate in opposite directions, forming a "dual-impeller axial flow fan," the blowing effect and drying efficiency of the material at the bottom are significantly improved.

[0019] Based on the above embodiment, a third sleeve 7 for fixing the planetary speed increaser 4 is provided below the rotor 303. An adjustment seat 701 is threadedly connected to the lower portion of the outer wall of the third sleeve 7. The outer wall of the adjustment seat 701 is connected to multiple connecting brackets 702 extending outward and downward. The ends of the multiple connecting brackets 702 away from the adjustment seat 701 are commonly connected to a conical abutment plate 703, which is adapted to the inner wall of the housing 1. By rotating the adjustment seat 701 threadedly connected to the third sleeve 7, the height of the abutment plate 703 can be adjusted accordingly until the abutment plate 703 is tightly fitted against the inner wall of the housing 1, thereby installing and fixing the third sleeve 7 and the planetary speed increaser 4.

[0020] Based on the above embodiment, a first sleeve 501 is fixedly sleeved on the lower shaft 402, a transmission shaft 403 is disposed through the first sleeve 501, and axial fan blades 5 are mounted on the lower outer wall of the first sleeve 501. Specifically, a second sleeve 502 is sleeved on the lower outer wall of the first sleeve 501 in an axially sliding and circumferentially rotating manner, with the axial fan blades 5 fixedly connected to the outer wall of the second sleeve 502. A V-shaped groove 5021 is defined on the lower edge of the second sleeve 502, preferably with an included angle of 90°. The included angle of the V-shaped groove 5021 and the transition between the V-shaped groove 5021 and the lower edge of the second sleeve 502 are rounded. A radially distributed drive shaft 5012 is connected to the outer wall of the lower end of the first sleeve 501. The drive shaft 5012 abuts against the lower edge / V-shaped groove 5021 of the second sleeve 502. A limit ring 5011 is connected to the first sleeve 501, and a compression spring 503 is provided between the second sleeve 502 and the limit ring 5011. During use, the rotor 303 in this embodiment drives the drive belt 304 to rotate clockwise (when viewed from above) to stir, which in turn drives the scraper 6 to rotate at the same speed and direction. At the same time, the planetary speed increaser 4 drives the axial flow fan blades 5 to increase speed and rotate counterclockwise (when viewed from above). Because the material in the inner cavity of the shell 1 forms a vortex with a high periphery and a low center during rotation and stirring, the pressure on the axial flow fan blades 5 is relatively small, allowing normal operation. When the rotation speed of the rotor 303 is low, there will be more material at the bottom end of the inner cavity of the shell 1. At this time, the axial fan blades 5 will encounter greater resistance during rotation. The drive shaft 5012 can push the second sleeve 502 to move upward and disengage from the V-groove 5021 and squeeze the compression spring 503. The drive shaft 5012 will produce a certain angle of idling, so the rotation speed of the axial fan blades 5 can be reduced, avoiding damage to the axial fan blades 5 due to the large shear force generated by the high rotation speed. After the drying is completed, the nitrogen backflush pipe 105 and the drive motor 301 are closed, and the hemispherical valve flap 1023 is opened for unloading. Since the driving screw belt 304 stops rotating, the material carried by the driving screw belt 304 will fall and accumulate in the lower part of the inner cavity of the shell 1. At this time, the axial flow fan blades 5 will increase the axial and circumferential internal stresses due to the accumulation of materials, and the axial flow fan blades 5 will reduce the unloading channel and thus affect the material unloading rate. Due to the structural characteristics of the second sleeve, in this embodiment, the axial flow fan blades 5 can be pushed to produce adaptive deflection when the material is unloaded, which can not only effectively protect the axial flow fan blades 5, but also make the material unloading smoother.

[0021] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An improved single-cone spiral ribbon dryer, comprising a conical shell (1), wherein a feed valve (101) is provided at the top of the shell (1), and a discharge valve (102) is provided at the bottom. The discharge valve (102) is an eccentric hemispherical valve, wherein an inlet (1021) is provided at the upper end, an outlet (1022) is provided at the lower end, and a hemispherical valve disc (1023) is provided inside the discharge valve. A rotor (303) is rotatably provided in the shell (1), and a driving spiral ribbon (304) is installed on the rotor (303). A driving mechanism (3) connected to the rotor (303) is installed at the top of the shell (1); the characteristics are: A nitrogen backflush pipe (105) is horizontally penetrated near the inlet (1021) of the discharge valve (102). When the hemispherical valve flap (1023) blocks the inlet (1021), the nitrogen backflush pipe (105) faces the top surface of the hemispherical valve flap (1023). An anti-blowing ring (8) is fixedly installed on the inner side wall of the inlet (1021) of the discharge valve (102). The longitudinal section of the anti-blowing ring (8) is in a U-shaped structure. An annular buffer chamber (802) is separated by a vertical annular partition plate (801) inside the anti-blowing ring (8). The buffer chamber (802) is communicated with the nitrogen backflush pipe (105). A plurality of air outlet holes (8011) are formed in the partition plate (801) along its circumferential direction. The plurality of air outlet holes (8011) are distributed around the hemispherical valve flap (1023). A one-way air outlet valve is installed at the air outlet hole (8011). A planetary speed increaser (4) is fixedly provided below the rotor (303). The planetary speed increaser (4) has an upper shaft (401) and a lower shaft (402). The upper shaft (401) is coaxially connected with the rotor (303). An axial flow fan blade (5) is installed on the lower shaft (402).

2. The improved single-cone spiral ribbon dryer according to claim 1, characterized in that: An installation hole (3031) is formed in the bottom end surface of the rotor (303). The upper shaft (401) is fixedly connected to the installation hole (3031). Both the upper shaft (401) and the lower shaft (402) are hollow shafts. A transmission shaft (403) is fixedly sleeved inside the upper shaft (401). The transmission shaft (403) penetrates through the lower shaft (402) until it reaches the inlet (1021). A scraper (6) is connected to the lower end of the transmission shaft (403). The scraper (6) is adapted to the semi-arc surface of the hemispherical valve flap (1023) along its length direction. A flow disturbance inclined surface (601) with a lower front and a higher rear is provided on one side of the scraper (6) along the radial movement direction of the transmission shaft (403). A pointed scraping blade part (602) is formed at the bottom of the front side of the flow disturbance inclined surface (601). Guide air inclined plates (803) are provided on both sides of the inner side wall of the partition plate (801) at the air outlet hole (8011). The guide air inclined plates (803) point to one side away from the radial movement direction of the transmission shaft (403).

3. The improved single-cone spiral ribbon dryer according to claim 1, characterized in that: A third sleeve (7) for fixing the planetary speed increaser (4) is provided below the rotor (303). A regulating seat (701) is threadedly connected to the lower part of the outer side wall of the third sleeve (7). A plurality of connecting brackets (702) extending outward and downward are connected to the outer side wall of the regulating seat (701). One ends of the plurality of connecting brackets (702) away from the regulating seat (701) are commonly connected to a conical surface abutting plate (703). The abutting plate (703) is adapted to the inner side wall of the housing (1).

4. The improved single-cone spiral ribbon dryer according to claim 2, characterized in that: A first sleeve (501) is fixedly sleeved on the lower shaft (402). The transmission shaft (403) penetrates through the first sleeve (501). The axial flow fan blade (5) is installed on the outer side wall of the lower end of the first sleeve (501).

5. The improved single-cone spiral ribbon dryer according to claim 4, characterized in that: The outer side wall of the lower end of the first sleeve (501) is sleeved with a second sleeve (502) in an axially sliding and circumferentially rotating manner, and the axial fan blade (5) is fixedly connected to the outer side wall of the second sleeve (502); a V-shaped groove (5021) is provided on the lower edge of the second sleeve (502); the outer side wall of the lower end of the first sleeve (501) is connected to a drive shaft (5012), and the drive shaft (5012) abuts against the lower edge / V-shaped groove (5021) of the second sleeve (502); a limiting ring (5011) is connected to the first sleeve (501), and a compression spring (503) is provided between the second sleeve (502) and the limiting ring (5011).

6. The improved single-cone spiral ribbon dryer according to claim 1, characterized in that: The outer surface of the shell (1) is provided with a heat-insulating jacket (108), and the space enclosed between the heat-insulating jacket (108) and the outer surface of the shell (1) is filled with a heating medium, wherein the heating medium is water. The lower part of the heat-insulating jacket (108) is provided with a water inlet pipe (106), and the upper part of the heat-insulating jacket (108) is provided with a water outlet pipe (107).

7. The improved single-cone spiral ribbon dryer according to claim 1, characterized in that: A sampler (103) is provided at the lower part of the shell (1), and the sampler (103) is provided through the heat-insulating jacket (108); a collector (2) and a cleaning pipe (104) are provided at the top of the shell (1).

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