An automated continuous hydroxypropyl methylcellulose washing device

Abstract

The present invention provides an automated continuous hydroxypropyl methylcellulose washing device, belonging to the technical field of automated washing devices for hydroxypropyl methylcellulose. The automated continuous hydroxypropyl methylcellulose washing device includes: a frame and a plurality of washing tanks sequentially distributed from top to bottom on the frame; a rotary belt filter screen, which includes a horizontal washing section corresponding to each washing tank and a horizontal liquid draining section arranged horizontally at the bottommost part, and a liquid draining collection cavity is arranged at the bottom of the frame and located below the horizontal liquid draining section; a feeding tank, which is arranged on the frame and is located above the upstream end of the uppermost horizontal washing section; an interlayer transfer tank, one is arranged at the downstream end of each horizontal washing section and at the downstream end of the horizontal liquid draining section, and longitudinal channels are formed by outer arches on both sides of the interlayer transfer tank. The present invention has the advantages of high automation degree, continuous cavity, large processing capacity and good washing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of automated washing devices for hydroxypropyl methylcellulose, and particularly to an automated continuous hydroxypropyl methylcellulose washing device. Background Art

[0002] During the synthesis process of hydroxypropyl methylcellulose (HPMC), some impurities may remain, such as reaction by-products, solvents, and unreacted raw materials. Washing is the process of removing these impurities from HPMC, and its principle can be summarized as follows:

[0003] Solubility differences: According to the solubility of different components, an appropriate detergent can be selected to dissolve or disperse the impurities on the surface of HPMC for easier removal. Physical agitation and rinsing: Through physical agitation and rinsing, the detergent can be brought into full contact with HPMC and rapidly dispersed, causing the impurities to disperse in the washing liquid. Common rinsing methods include spraying, soaking, agitation, etc. Detergent selection: The appropriate detergent can be selected by adjusting according to the characteristics of HPMC and the impurities. For example, a detergent with a high surfactant capacity can effectively disperse and remove the impurities attached to the surface. Washing temperature control: The temperature during the washing process can affect the solubility of the impurities and the physical properties of HPMC. Too high a temperature may cause the denaturation of HPMC, while too low a temperature may reduce the washing effect. Therefore, appropriate temperature control is required according to the specific situation. Washing times and duration: According to the purity requirements of HPMC and the effect of the detergent, the number of washing times and the duration can be determined. Usually, multiple washings are carried out until the required purity is achieved.

[0004] Currently, the common washing devices for hydroxypropyl methylcellulose (HPMC) generally include the following main parts:

[0005] Washing tank: The washing tank is the main container for washing. Generally, materials with good corrosion resistance and high sealing performance, such as stainless steel, are used. The washing tank has a certain volume to hold the washing liquid and the HPMC to be washed. Stirring device: The stirring device is used to stir the washing liquid and HPMC during the washing process to promote the contact and mixing between the detergent and HPMC. The stirring device generally consists of a stirring paddle, a stirring motor, and a transmission device, etc. Flushing device: The flushing device is used to spray or inject the washing liquid onto the surface of HPMC to thoroughly clean the impurities on HPMC. The flushing device can be in the form of nozzles, spray guns, or spraying devices, etc. Filtering equipment: The filtering equipment is used to separate the washed HPMC from the washing liquid to remove residual impurities and detergents. The filtering equipment usually includes filters, filter cloths, filter meshes, or centrifugal separation equipment, etc. Liquid supply system: The liquid supply system is used to transport the washing liquid into the washing tank. It can include a liquid storage tank, a pump, pipelines, and valves, etc., to ensure the stable supply of the washing liquid. Control system: The control system is used to monitor and control parameters such as the temperature, time, and stirring speed of the washing process. It can include sensors, temperature controllers, liquid level controllers, timers, and an automated control system, etc.

[0006] In summary, the existing washing method uses a closed washing tank and sets a stirring device inside the tank. It mainly has defects such as low automation level, small single - washing volume, low feeding and discharging efficiency, and difficulty in adapting to the washing of a large quantity of hydroxypropyl methylcellulose. Summary of the Invention

[0007] To solve the above - mentioned technical problems, the present invention proposes an automated continuous hydroxypropyl methylcellulose washing device with high automation level, continuous cavity, large processing capacity, and good washing effect.

[0008] The technical solution of the present invention is realized as follows:

[0009] An automated continuous hydroxypropyl methylcellulose washing device, comprising:

[0010] A frame and a plurality of washing tanks distributed from top to bottom on the frame. A detergent discharge pipeline is laterally arranged on the washing tank, and the detergent discharge pipeline is connected to a detergent filter tank through a suction pump;

[0011] A rotary belt filter, which includes a horizontal washing section corresponding to each washing tank and a horizontal liquid drainage section arranged horizontally at the bottom. A liquid drainage collection cavity is arranged at the bottom of the frame below the horizontal liquid drainage section;

[0012] A feeding tank, which is arranged on the frame and is located above the upstream end of the top - most horizontal washing section;

[0013] Interlayer transfer tanks are provided at the downstream ends of each transverse washing section and the downstream end of the transverse draining section. Longitudinal channels are formed by outer arches on both sides of the interlayer transfer tanks;

[0014] The bottom outlet of the longitudinal channel between two adjacent transverse washing sections extends to the top of the upstream end of the next-layer transverse washing section, and the bottom outlet of the longitudinal channel at the downstream end of the transverse draining section extends below the rack;

[0015] A "V"-shaped guiding part is arranged between the downstream slot openings of the two longitudinal channels of the interlayer transfer tank, and the guiding part is located at the top of the downstream ends of the transverse washing section and the transverse draining section;

[0016] Above the transverse washing section, a detergent spraying pipe is provided. The detergent spraying pipe is connected to a detergent supply pipe, and the detergent supply pipe is connected to a detergent filter tank through a supply pump.

[0017] Further, the cavity of the washing tank is divided into an upstream soaking cavity and a downstream spraying cavity which are distributed upstream and downstream from the middle thereof, and the bottom height of the upstream soaking cavity is less than the bottom height of the downstream spraying cavity;

[0018] The transverse washing section is arranged to include an upstream soaking section and a downstream spraying section respectively corresponding to the upstream soaking cavity and the downstream spraying cavity, and the interval between the upstream soaking section and the bottom of the upstream soaking cavity is equal to the interval between the downstream spraying section and the bottom of the downstream spraying cavity.

[0019] Further, the transverse washing section further includes an upstream inclined section and an upstream horizontal section provided at the upstream end of the upstream soaking section, and the transverse washing section further includes a downstream inclined section and a downstream horizontal section provided at the downstream end of the downstream spraying section, and the feed tank is arranged directly above the uppermost upstream horizontal section, and the guiding part is arranged at the top of the downstream horizontal part.

[0020] Further, a transfer material homogenizing screw is rotatably installed at the top inlet of the longitudinal channel corresponding to the bottom outlets of the two longitudinal channels of the interlayer transfer tank of the transverse washing section, and the bottom end of the transfer material homogenizing screw forms a material homogenizing and discharging channel by being spaced from the transverse washing section or the transverse draining section below it.

[0021] Further, the height of the bottom outlet of the longitudinal channel corresponding to the top inlet of the transverse washing section is greater than the height of the transfer material homogenizing screw, and the bottom end of the inner wall surface at the downstream end of the bottom outlet of this longitudinal channel is inclined upstream, so that the downstream end of the bottom outlet of this longitudinal channel is located on the upstream side of the axis of the transfer material homogenizing screw in the conveying direction.

[0022] Further, a partition board is arranged between the inner walls on both sides of the interlayer transfer groove at the part below the horizontal washing section. The partition board includes a vertical plane part that is flush with the inner wall surface of the upstream end of the longitudinal channel and is in a vertical state from top to bottom, and a longitudinal arc part that is concentric with the transfer material homogenizing spiral at the bottom end of the vertical plane part.

[0023] Further, the transfer material homogenizing spiral is arranged as a two-way spiral symmetrically distributed in the width direction of the horizontal washing section, and the rotating shaft of the transfer material homogenizing spiral passes through the frame and is connected with a material homogenizing motor.

[0024] Further, the feed trough is arranged above the upstream horizontal section of the uppermost layer. The feed trough includes a frame-shaped part in a "C" shape and a guiding plate arranged at the open end of the downstream end of the frame-shaped part;

[0025] A feed material homogenizing spiral is arranged on the downstream side of the guiding plate above the upstream horizontal section. The guiding plate is inclined, and the bottom end of the guiding plate is provided with an arc part concentric with the feed material homogenizing spiral. The bottom end of the arc part extends to the axis of the rotating shaft of the feed material homogenizing spiral in the height direction. The feed material homogenizing spiral forms a feed channel by being arranged at an interval with the upstream horizontal section.

[0026] Further, there is a gap between the inner walls on both sides of the washing trough and the two side surfaces of the horizontal washing section. Partition nets are arranged on both sides of the upper surface of the horizontal washing section, and both ends of the partition nets are connected to the inner wall of the side of the washing trough by bending outwards. The tops of the two partition nets on the same layer are fixedly connected by a support plate, and the detergent spraying pipe is installed on the support plate.

[0027] Further, the detergent spraying pipe includes a horizontal main pipe and a row of branch pipes vertically arranged at the bottom of the main pipe. Spray holes are evenly arranged on the surface of the branch pipes. A suspension pipe is vertically arranged at the middle position of the top end of the main pipe. The top end of the suspension pipe is rotationally connected with the detergent supply pipe, and the suspension pipe is rotatably installed on the support plate. An external transmission connection of the suspension pipe is provided with a rotating pipe device for driving the detergent spraying pipe to rotate.

[0028] The present invention has the following beneficial effects:

[0029] 1. The rotary belt filter is used to carry hydroxypropyl methylcellulose particles through the washing trough to make full contact and mixing with the detergent. Combining the cleaning method of soaking first and then spraying the hydroxypropyl methylcellulose particles by multiple layers of washing troughs, it has the advantages of high automation degree, good washing effect and large processing capacity.

[0030] 2. The switching between different levels from top to bottom of the rotary belt filter enables the surface supporting the hydroxypropyl methylcellulose to be continuously switched. By using the process of passing through the upstream soaking cavity, the rotary belt filter can be synchronously cleaned to reduce the situation of the rotary belt filter carrying impurities.

[0031] 3. By utilizing the transfer effect of the interlayer transfer trough and the spreading effect of the transfer material homogenizing spiral, the hydroxypropyl methylcellulose particles are evenly distributed after being transferred between the horizontal washing sections of different layers and between the horizontal washing section and the horizontal leachate section. While improving the washing effect, the force on the rotary belt filter is more uniform, so as to ensure the long-term and effective operation of the device.

[0032] 4. Utilize the stirring and spraying effect of the detergent spray pipe on hydroxypropyl methylcellulose to improve the contact effect between hydroxypropyl methylcellulose and detergent and enhance the washing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is an overall schematic diagram of the automated continuous hydroxypropyl methylcellulose washing device of the present invention;

[0034] Figure 2 The present invention is an automatic continuous hydroxypropyl methylcellulose washing device Figure 1 Another perspective of the picture;

[0035] Figure 3 It is a partial schematic diagram of the automated continuous hydroxypropyl methylcellulose washing device of the present invention;

[0036] Figure 4 Schematic diagram of the distribution of the rotary belt filter and the washing tank of the automated continuous hydroxypropyl methylcellulose washing device of the present invention;

[0037] Figure 5 Schematic diagram of the distribution of washing tanks of the automated continuous hydroxypropyl methylcellulose washing device of the present invention;

[0038] Figure 6 Schematic diagram of the distribution of the rotary belt filter of the automated continuous hydroxypropyl methylcellulose washing device of the present invention;

[0039] Figure 7 2. It is a cross-sectional view of the interlayer transfer tank of the automated continuous hydroxypropyl methylcellulose washing device of the present invention;

[0040] Figure 8 Schematic diagram of the distribution of washing liquid spray pipes of the automated continuous hydroxypropyl methylcellulose washing device of the present invention;

[0041] Figure 9 The present invention is an automatic continuous hydroxypropyl methylcellulose washing device Figure 8 A in the enlarged view. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figures 1 to 9 As shown in the figure, the automated continuous hydroxypropyl methylcellulose washing device provided by the present invention mainly includes a frame 1, a washing tank 2, a rotary belt filter, a feeding tank 9 and an interlayer transfer tank.

[0044] A plurality of washing tanks 2 are sequentially arranged on the frame 1 from top to bottom, and the plurality of washing tanks 2 are arranged in a layered state. A detergent discharge pipe 3 is laterally arranged on the washing tank 2 for timely discharging the detergent after washing the hydroxypropyl methylcellulose particles in the washing tank 2 from the washing tank 2. The detergent discharge pipe 3 is connected to a detergent filter tank 5 through a suction pump 4. The detergent filter tank 5 is used for filtering the detergent discharged from the washing tank 2 for the recycled use of the detergent.

[0045] The rotary belt filter is arranged as a rotary closed belt, and filter holes are uniformly arranged on its belt surface. The rotary filter is provided with a plurality of transverse sections, and a part of the transverse sections are arranged as transverse washing sections 6 corresponding to each washing tank 2. The transverse washing sections 6 are used for carrying the hydroxypropyl methylcellulose particles through the washing tank 2, so that the hydroxypropyl methylcellulose particles are fully mixed with the detergent and washed. The lowermost transverse section is arranged as a transverse draining section 7, which is used for draining the washed hydroxypropyl methylcellulose particles.

[0046] During the operation of the rotary belt filter, the hydroxypropyl methylcellulose particles enter the uppermost washing tank 2 from the uppermost transverse washing section 6 for washing, and then sequentially pass through each layer of washing tank 2 along an "S"-shaped running track from top to bottom for multiple washes. Finally, after being drained by the transverse draining section 7, they are discharged from the rotary belt filter.

[0047] A draining collection cavity 8 is arranged at the bottom of the frame 1 below the transverse draining section 7, which is used for collecting the detergent drained when the hydroxypropyl methylcellulose particles are conveyed by the transverse draining section 7.

[0048] The feeding tank 9 is fixedly installed on the frame 1, and the feeding tank 9 is located above the upstream end of the uppermost transverse washing section 6. The hydroxypropyl methylcellulose particles enter the uppermost transverse washing section 6 from the feeding tank 9.

[0049] An interlayer transfer tank is provided at the downstream end of each transverse washing section 6 and at the downstream end of the transverse drainage section 7. The two sides of the interlayer transfer tank form a longitudinal channel 10 through an outer arch. The hydroxypropyl methylcellulose particles on the upper transverse washing section 6 enter the two longitudinal channels 10 respectively at the downstream end of the transverse washing section 6 after passing through the washing tank 2 of this layer, and then fall from the longitudinal channels 10 to the lower transverse washing section 6 or the transverse drainage section 7 to realize the hierarchical transfer of the hydroxypropyl methylcellulose particles from top to bottom. Moreover, the hydroxypropyl methylcellulose particles on the transverse drainage section 7 are led out of the rotary belt filter by the longitudinal channel 10 after passing through the interlayer transfer tank at its downstream end.

[0050] Among them, the bottom outlet of the longitudinal channel 10 located between two adjacent transverse washing sections 6 extends to the top of the upstream end of the lower transverse washing section 6, and the bottom outlet of the longitudinal channel 10 located at the downstream end of the transverse drainage section 7 extends below the frame 1.

[0051] A "V"-shaped guiding part 11 is arranged between the downstream notch openings of the two longitudinal channels 10 of the interlayer transfer tank, and the guiding part 11 is located at the top of the downstream ends of the transverse washing section 6 and the transverse drainage section 7. The guiding part 11 is used to guide the hydroxypropyl methylcellulose particles moving to the downstream ends of the transverse washing section 6 and the transverse drainage section 7, so that the hydroxypropyl methylcellulose particles converge better into the top inlet of the longitudinal channel 10, and then the transfer efficiency of the hydroxypropyl methylcellulose particles between the upper and lower transverse washing sections 6 and between the transverse washing section 6 and the transverse drainage section 7 is improved by means of the conveying performance of the rotary belt filter.

[0052] A detergent spray pipe 12 is arranged above the transverse washing section 6. The detergent spray pipe 12 is connected with a detergent supply pipe 13, and the detergent supply pipe 13 is connected with a detergent filter tank 5 through a supply pump 14. The supply pump 14 pumps the filtered detergent in the detergent filter tank 5 into the detergent supply pipe 13, and then the detergent supply pipe 13 transports the detergent into the detergent spray pipe 12. Finally, the detergent is sprayed out from the detergent spray pipe 12, scouring the hydroxypropyl methylcellulose particles in the washing tank 2 and forming a detergent solution area with a certain depth in the washing tank 2 to realize the soaking of the hydroxypropyl methylcellulose particles.

[0053] Further, in the embodiment of the present invention, the cavity of the washing tank 2 is divided into an upstream soaking cavity 2.1 and a downstream spraying cavity 2.2 which are distributed upstream and downstream from the middle thereof, and the bottom height of the upstream soaking cavity 2.1 is less than the bottom height of the downstream spraying cavity 2.2. At this time, the bottom of the cavity of the washing tank 2 is in a downward concave state from the downstream spraying cavity 2.2 to the upstream soaking cavity 2.1. When the hydroxypropyl methylcellulose particles pass through the washing tank 2, they first pass through the upstream soaking cavity 2.1 and then through the downstream spraying cavity 2.2, so that the hydroxypropyl methylcellulose particles are first soaked in the detergent in the upstream soaking cavity 2.1, fully mixed with the detergent, and then pass through the downstream spraying cavity 2.2 in a sprayed manner.

[0054] The transverse washing section 6 is arranged to include an upstream soaking section 6.1 and a downstream spraying section 6.2 which are respectively arranged corresponding to the upstream soaking cavity 2.1 and the downstream spraying cavity 2.2, and the interval between the upstream soaking section 6.1 and the bottom of the upstream soaking cavity 2.1 is equal to the interval between the downstream spraying section 6.2 and the bottom of the downstream spraying cavity 2.2. At this time, when the transverse washing section 6 carries the hydroxypropyl methylcellulose particles through the upstream soaking section 6.1, through the height setting of its upstream soaking section 6.1, it can make the hydroxypropyl methylcellulose particles be soaked in the detergent more thoroughly, improve the contact effect between the hydroxypropyl methylcellulose particles and the detergent, and improve the soaking effect.

[0055] The height of the downstream spraying section 6.2 of the transverse washing section 6 is greater than the height of the upstream soaking section 6.1, so that during the process of the soaked hydroxypropyl methylcellulose particles moving from the upstream soaking cavity 2.1 to the downstream spraying cavity 2.2, they move out of the detergent in the upstream soaking cavity 2.1 and are sprayed and washed in the downstream spraying cavity 2.2. At the same time, the impurities generated after washing will converge from the downstream spraying cavity 2.2 to the upstream soaking cavity 2.1 in the washing tank 2, thereby improving the washing effect of the hydroxypropyl methylcellulose particles.

[0056] Wherein, the inlet of the detergent discharge pipe 3 is connected to the side surface of the upstream soaking cavity 2.1 of the washing tank 2, so that the detergent in the washing tank 2 converges from the downstream spraying cavity 2.2 to the upstream soaking cavity 2.1 in the washing tank 2 and is timely drawn away, preventing the impurities in the detergent from re-polluting the hydroxypropyl methylcellulose particles. At the same time, it makes the detergent in the washing tank 2 have a fluidity against the conveying direction of the hydroxypropyl methylcellulose particles, further improving the washing effect of the hydroxypropyl methylcellulose particles.

[0057] Furthermore, the transverse washing section 6 further includes an upstream inclined section 6.3 and an upstream horizontal section 6.4 arranged at the upstream end of the upstream washing section, and the transverse washing section 6 further includes a downstream inclined section 6.5 and a downstream horizontal section 6.6 arranged at the downstream end of the downstream spraying section 6.2.

[0058] At this time, each transverse washing section 6 of the rotary belt filter screen includes, in sequence from upstream to downstream, an upstream horizontal section 6.4, an upstream inclined section 6.3, an upstream soaking section 6.1, a downstream spraying section 6.2, a downstream inclined section 6.5, and a downstream horizontal section 6.6. Hydroxypropyl methylcellulose particles enter the transverse washing section 6 from the upstream horizontal section 6.4, then enter the upstream soaking cavity 2.1 through the upstream inclined section 6.3, obliquely upward after passing through the upstream soaking section 6.1 and then enter the downstream spraying cavity 2.2, and after passing through the downstream spraying cavity 2.2, enter the downstream horizontal section 6.6 through the downstream inclined section 6.5. At this time, the hydroxypropyl methylcellulose particles entering the downstream horizontal section 6.6 will enter the longitudinal channels 10 on both sides under the action of the guiding portion 11 respectively.

[0059] A transfer material homogenizing screw 15 is rotatably installed between the top entrance of the longitudinal channel 10 corresponding to the bottom outlets of the two longitudinal channels of the interlayer transfer groove of the transverse washing section 6. The bottom end of the transfer material homogenizing screw 15 forms a material homogenizing and discharging channel 16 by being spaced apart from the transverse washing section 6 or the transverse draining section 7 below it.

[0060] At this time, the hydroxypropyl methylcellulose particles discharged from the bottom outlet of the longitudinal channel 10 are first spread in the width direction by the transfer material homogenizing screw 15 when being conveyed at the upstream end of entering the lower-layer transverse washing section 6 or the transverse draining section 7, so that the hydroxypropyl methylcellulose particles after each transfer through the interlayer transfer groove can be evenly distributed on the rotary belt filter screen.

[0061] Furthermore, the height of the bottom outlet of the longitudinal channel 10 corresponding to the top entrance of the transverse washing section 6 is greater than the height of the transfer material homogenizing screw 15, and the bottom end of the inner wall surface at the downstream end of the bottom outlet of this longitudinal channel 10 is inclined upward toward the upstream, so that the downstream end of the bottom outlet of this longitudinal channel 10 is located on the upstream side of the rotation axis of the transfer material homogenizing screw in the conveying direction.

[0062] By making the longitudinal channel 10 be arranged as above, the hydroxypropyl methylcellulose particles transferred from the upper-layer transverse washing section 6 to the lower-layer transverse washing section 6 and the hydroxypropyl methylcellulose particles transferred from the transverse washing section 6 to the transverse draining section 7 will move in the upstream direction of the transfer material homogenizing screw 15 after being discharged from the bottom outlet of the longitudinal channel 10. It is ensured that the transferred hydroxypropyl methylcellulose particles are evenly spread by the transfer material homogenizing screw 15 before passing through the washing tank 2 and being drained.

[0063] Furthermore, a partition plate 17 is arranged between the inner wall surfaces on both sides of the interlayer transfer groove at the part below the transverse washing section 6. The partition plate 17 includes, from top to bottom, a longitudinal plane portion flush with the inner wall surface of the upstream end of the longitudinal channel 10 and in a vertical state, and a longitudinal arc portion concentric with the transfer material homogenizing screw 15 arranged at the bottom end of the longitudinal plane portion.

[0064] By making the above settings, the hydroxypropyl methylcellulose particles discharged from the bottom outlet of the longitudinal channel 10 will be concentrated in the area between the longitudinal arc portion and the transfer material homogenizing screw 15, improving the effect of the transfer material homogenizing screw 15 on evenly spreading the hydroxypropyl methylcellulose particles.

[0065] The transfer material homogenizing screw 15 is arranged as a bidirectional screw symmetrically distributed in the width direction of the transverse washing section 6, and the axis of the transfer material homogenizing screw passes through the frame 1 and is connected to a material homogenizing motor.

[0066] In the embodiment of the present invention, the feed trough 9 is arranged above the upstream horizontal section 6.4 of the uppermost layer. The feed trough 9 includes a frame-shaped portion 9.1 in a "C" shape and a guiding plate 9.2 arranged at the open end of the downstream end of the frame-shaped portion 9.1. The guiding plate 9.2 seals the top of the open end of the downstream end of the frame-shaped portion 9.1 and makes the bottom of the open end of the downstream end of the frame-shaped portion 9.1 open.

[0067] On the downstream side of the guiding plate 9.2, there is a feed material homogenizing screw 18 located above the upstream horizontal section 6.4. The guiding plate 9.2 is inclined, and the bottom end of the guiding plate 9.2 is set as an arc portion concentric with the feed material homogenizing screw 18. The bottom end of the arc portion extends to the axis of the feed material homogenizing screw in the height direction. At this time, the feed material homogenizing screw 18 forms a feed channel 19 by being spaced apart from the upstream horizontal section 6.4.

[0068] There is a gap between the inner walls on both sides of the washing trough 2 and the two side surfaces of the transverse washing section 6. On both sides of the upper surface of the transverse washing section 6, there are separation nets 20 provided. The two ends of the separation net 20 are connected to the inner side wall of the washing trough 2 by bending outward. The tops of the two separation nets 20 on the same layer are fixedly connected by a support plate 21, and the detergent injection pipe 12 is installed on the support plate 21.

[0069] At this time, the separation net 20 can prevent the hydroxypropyl methylcellulose particles on the transverse washing section 6 from falling into the washing trough 2 through the gap between it and the inner side wall of the washing trough 2 and blocking the detergent discharge pipe 3. At the same time, the setting of the separation net 20 cooperates with the gap between the inner walls on both sides of the washing trough 2 and the two side surfaces of the transverse washing section 6.

[0070] At this time, the impurities generated after washing can directly pass through the separation net 20 from both sides of its top and enter the washing trough 2 directly through the gap between the transverse washing section 6 and the inner side wall of the washing trough 2 and be pumped away. The situation that the impurities generated after washing remain on the hydroxypropyl methylcellulose particles is reduced to improve the washing effect of the hydroxypropyl methylcellulose particles. In addition, the flow performance of the detergent in the washing trough 2 is improved, the contact effect between the hydroxypropyl methylcellulose particles and the detergent is improved, and the washing effect is improved.

[0071] The detergent spray pipe 12 comprises a horizontally arranged main pipe 12.1 and a row of branch pipes 12.2 arranged vertically at the bottom of the main pipe 12.1. Spray holes 12.3 are evenly distributed on the surface of the branch pipes 12.2. A hanging pipe 12.4 is vertically arranged in the middle of the top of the main pipe 12.1. The top of the hanging pipe 12.4 is rotatably connected to the detergent liquid supply pipe 13 and the hanging pipe 12.4 is rotatably mounted on the support plate 21. The external transmission connection of the hanging pipe 12.4 is connected to a rotating pipe device 22 that drives the detergent spray pipe 12 to rotate.

[0072] In an embodiment of the present invention, detergent spray pipes 12 are provided on both the upstream soaking section 6.1 and the downstream spraying section 6.2. A pipe rotating device 22 drives the main pipe 12.1 to rotate below the support plate 21. At this point, the main pipe 12.1 drives the row of branch pipes at its bottom to rotate. During rotation, the branch pipes continuously stir the hydroxypropyl methylcellulose particles, and combined with the detergent sprayed from the spray holes 12.3, the contact effect between the hydroxypropyl methylcellulose particles and the detergent can be greatly improved. At the same time, during rotation, as the angle between the interval between two adjacent branch pipes and the sidewall of the washing tank 2 continuously changes, the position of the hydroxypropyl methylcellulose that is cut during the process of passing through the branch pipes continuously changes, further improving the contact effect between the hydroxypropyl methylcellulose particles and the detergent, thereby improving the washing effect of the hydroxypropyl methylcellulose particles.

[0073] The pipe rotating device 22 includes a pulley assembly provided on the suspension pipe 12.4 and a pipe rotating motor installed on the frame 1 for driving the pulley assembly to move.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automated continuous hydroxypropyl methylcellulose washing device, characterized in that, Comprising: A frame (1) and a plurality of washing tanks (2) sequentially distributed from top to bottom on the frame (1). A detergent discharge pipe (3) is provided laterally on the washing tank (2), and the detergent discharge pipe (3) is connected to a detergent filter tank (5) through a suction pump (4); A rotary belt filter screen, arranged as a rotary closed belt, which includes a transverse washing section (6) corresponding to each washing tank (2) and a transverse liquid draining section (7) arranged horizontally at the bottommost. A liquid draining collection cavity (8) is provided at the bottom of the frame (1) below the transverse liquid draining section (7), and the rotary belt filter screen can be switched between different levels from top to bottom; During the operation of the rotary belt filter screen, hydroxypropyl methylcellulose particles enter the uppermost washing tank (2) from the uppermost transverse washing section (6) to be washed, and then sequentially pass through each washing tank (2) along an "S"-shaped running track from top to bottom for multiple washes; A feed trough (9), which is arranged on the frame (1), and the feed trough (9) is located above the upstream end of the uppermost transverse washing section (6); Inter-layer transfer troughs, one is provided at the downstream end of each transverse washing section (6) and at the downstream end of the transverse liquid draining section (7). Longitudinal channels (10) are formed by outer arches on both sides of the inter-layer transfer trough; The bottom outlet of the longitudinal channel (10) between two adjacent transverse washing sections (6) extends to the top of the upstream end of the next-layer transverse washing section (6), and the bottom outlet of the longitudinal channel (10) at the downstream end of the transverse liquid draining section (7) extends below the frame (1); A "V"-shaped guiding portion (11) is provided between the downstream trough openings of the two longitudinal channels (1 ​ 2. The automated continuous hydroxypropyl methylcellulose washing device according to claim 1, wherein ​ ​ 3. An automated continuous hydroxypropyl methylcellulose washing device according to claim 2, characterized in that, The horizontal washing section (6) further includes an upstream inclined section (6.3) and an upstream horizontal section (6.4) provided at the upstream end of the upstream soaking section (6.1). The horizontal washing section (6) further includes a downstream inclined section (6.5) and a downstream horizontal section (6.6) provided at the downstream end of the downstream spraying section (6.2). The feed trough (9) is provided directly above the uppermost upstream horizontal section (6.4), and the guiding portion (11) is provided at the top of the downstream horizontal portion.

4. An automated continuous hydroxypropyl methylcellulose washing device according to claim 1, characterized in that, Between the bottom outlets of the two longitudinal channels (10) of the interlayer transfer trough corresponding to the top inlet of the longitudinal channel (10) of the horizontal washing section (6), a transfer material homogenizing screw (15) is rotatably installed. The bottom end of the transfer material homogenizing screw (15) forms a material homogenizing and discharging channel (16) by being spaced from the horizontal washing section (6) or the horizontal draining section (7) below it.

5. An automated continuous hydroxypropyl methylcellulose washing device according to claim 4, characterized in that, The height of the top inlet corresponding to the bottom outlet of the longitudinal channel (10) of the horizontal washing section (6) is greater than the height of the transfer material homogenizing screw (15), and the bottom end of the inner wall surface at the downstream end of the bottom outlet of this longitudinal channel (10) is inclined upward toward the upstream, such that the downstream end of the bottom outlet of this longitudinal channel (10) is located on the upstream side of the axis of the transfer material homogenizing screw in the conveying direction.

6. An automated continuous hydroxypropyl methylcellulose washing device according to claim 5, characterized in that, A partition plate (17) is provided between the portions of the inner side walls on both sides of the interlayer transfer trough below the horizontal washing section (6). The partition plate (17) includes, from top to bottom, a longitudinal planar portion flush with the inner wall surface of the upstream end of the longitudinal channel (10) and in a vertical state, and a longitudinal arc portion concentric with the transfer material homogenizing screw (15) provided at the bottom end of the longitudinal planar portion.

7. An automated continuous hydroxypropyl methylcellulose washing device according to claim 4, characterized in that, The transfer material homogenizing screw (15) is arranged as a two-way screw symmetrically distributed in the width direction of the horizontal washing section (6), and the axis of the transfer material homogenizing screw passes through the machine frame (1) and is connected to a material homogenizing motor.

8. An automated continuous hydroxypropyl methylcellulose washing device according to claim 2, characterized in that, The feed trough (9) is provided above the uppermost upstream horizontal section (6.4). The feed trough (9) includes a frame-shaped portion (9.1) in a "C" shape and a guiding plate (9.2) provided at the open end at the downstream end of the frame-shaped portion (9.1). On the downstream side of the guiding plate (9.2), a feed material homogenizing screw (18) is provided above the upstream horizontal section (6.4). The guiding plate (9.2) is inclined, and the bottom end of the guiding plate (9.2) is provided as an arc portion concentric with the feed material homogenizing screw (18). The bottom end of the arc portion extends to the axis of the feed material homogenizing screw in the height direction. The feed material homogenizing screw (18) forms a feed channel (19) by being spaced from the upstream horizontal section (6.4).

9. An automated continuous hydroxypropyl methylcellulose washing device according to claim 2, characterized in that, There is a gap between the inner side walls on both sides of the washing trough (2) and the two side surfaces of the horizontal washing section (6). On both sides of the upper surface of the horizontal washing section (6), separation nets (20) are provided, and both ends of the separation nets (20) are connected to the inner side walls of the washing trough (2) by being bent outward. Between the tops of the two separation nets (20) on the same layer, they are fixedly connected by a support plate (21), and the detergent spraying pipe (12) is installed on the support plate (21).

10. An automated continuous hydroxypropyl methylcellulose washing device according to claim 9, characterized in that, The detergent injection pipe (12) includes a horizontal main pipe (12.1) and a row of branch pipes (12.2) vertically arranged at the bottom of the main pipe (12.1). Spray holes (12.3) are evenly formed on the surface of the branch pipes (12.2). A suspension pipe (12.4) is vertically arranged at the middle position of the top end of the main pipe (12.1). The top end of the suspension pipe (12.4) is rotatably connected to a detergent supply pipe (13), and the suspension pipe (12.4) is rotatably mounted on a support plate (21). An external part of the suspension pipe (12.4) is drivingly connected to a rotating pipe device (22) for driving the detergent injection pipe (12) to rotate.

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