A new type of cylinder automatic sludge unloading sludge compression dewatering machine

Abstract

The present application belongs to the technical field of sludge dewatering, and discloses a novel automatic sludge unloading sludge compression dewatering machine. The novel sludge dewatering machine is composed of two mirror-symmetrical sludge compression cylinder bodies. One end of the cylinder body is open and provided with a hydraulic sealing plug. The concave opening of the hydraulic sealing plug is provided with a water filter plate. The two symmetrical cylinder bodies are connected by a left-right compression cylinder connecting piston. The maximum travel of the movable piston in the two compression cylinder bodies is the length of the compression cylinder body. In the present application, the two cylinder bodies are intermittently fed by sludge pumps to provide a set pressure for compressing and dewatering the sludge to realize continuous feeding. When the sludge compressed and dewatered in the compression cylinder started first reaches the full cylinder, the sludge feeding direction is switched, and the hydraulic sealing plug on the side where the dewatering is completed is retracted to expose the cylinder body unloading port. Then, the sludge pump on the other side feeds to generate pressure to move the left-right compression cylinder connecting piston between the two cylinder bodies to complete the sludge unloading on the dewatering side, thereby realizing automatic unloading.

Description

Technical Field

[0001] This invention relates to the field of sludge dewatering. Background Technology

[0002] Commonly used sludge dewatering machines include three main categories: plate and frame diaphragm dewatering machines, screw press dewatering machines, and belt filter press dewatering machines.

[0003] Plate and frame diaphragm dewatering machines are the most widely used and can produce dewatered sludge with a moisture content as low as 60-70%. However, plate and frame dewatering machines cannot operate continuously, and require shutdown and manual labor during unloading and other processes, making operation cumbersome, time-consuming, and labor-intensive. While screw press dewatering machines and belt filter press dewatering machines can achieve automatic feeding and discharging, screw press dewatering machines produce sludge with a high moisture content (usually as high as 80%), resulting in poor economic efficiency for subsequent dewatered sludge disposal. Belt filter press dewatering machines, due to their high equipment investment, are not suitable for small and medium-sized sewage treatment supporting projects and are generally only used in large sewage treatment plants.

[0004] Therefore, those skilled in the art have provided a novel cylinder-type automatic sludge unloading sludge compression and dewatering machine to solve the problems faced by the aforementioned technologies in dealing with sludge treatment in small and medium-sized sewage treatment plants. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a novel cylinder-type automatic sludge compression dewatering machine. This equipment consists of two sludge compression cylinders arranged in a mirror-symmetric manner, which can achieve unloading without stopping the machine and also achieve the same sludge moisture content discharge level of 65-70% as a plate and frame diaphragm dewatering machine.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The main dewatering equipment of the novel cylinder-type automatic sludge unloading sludge compression dewatering machine consists of two sludge compression cylinders arranged in a mirror-symmetric manner. One end of each sludge compression cylinder is open and equipped with a hollow concave hydraulic sealing plug. The concave opening at the compression end is equipped with a filter plate. The two axisymmetric cylinders are connected by a movable piston. The maximum stroke of the movable piston within the two compression cylinders is equal to the length within the compression cylinder.

[0007] The dewatering machine has two cylinders, each continuously fed by an independent sludge pump to provide a set pressure for compressing the sludge inside for dewatering. After the sludge is pumped into the operating cylinder and fills it, the hydraulic compression rods on both sides are locked. After 3-4 hours, when the sludge in the first-started compression cylinder accumulates to near full capacity, the pressure transmitter at the sludge inlet pipe of the feeding side compression cylinder reaches the set pressure value, which is set to 1.5-2.0 MPa depending on the dewatering requirements. The pressure transmitter sends a signal, and the first-started sludge pump on that side switches to feeding the other side compression cylinder. The hydraulic compression rod of the first-started cylinder unlocks and retracts until it protrudes outside the cylinder and into the discharge port. As the sludge feeding is switched to the other side compression cylinder, the connecting piston between the two cylinders moves towards the other side where the sludge has been dewatered, thus gradually pressing the dewatered sludge from the first-started cylinder, which meets the moisture content requirements, out of the cylinder, achieving automatic unloading.

[0008] During this process, the other cylinder is not full, so the sludge pump on that side continues to pump sludge into the rear-starting compression cylinder. After the sludge is discharged from the emptied compression cylinder, the hydraulically driven sealing plug on that side moves to attach to the connecting piston between the two cylinders and locks it. The rear-starting sludge feed pump continues to feed sludge to provide dewatering pressure until the rear-starting compression cylinder is full of sludge. Then, the hydraulic compression rod of the rear-starting cylinder is unlocked to expose the discharge port of that cylinder. The sludge feed pump is switched again to feed sludge into the other compression cylinder and pushes the connecting piston between the two cylinders to move towards the side where the sludge pressing and dewatering are completed, discharging the dewatered sludge that has accumulated in the compression cylinder on that side. This process can then begin the next cycle, repeating in this manner.

[0009] Through the above technical solutions, the sludge dewatering machine can achieve automatic feeding and unloading processes without stopping, similar to equipment such as screw press dewatering machines and high-pressure belt conveyors. At the same time, it can also achieve the dewatering degree of plate and frame sludge dewatering machines. This equipment is more suitable for sludge dewatering in small and medium-sized sewage treatment plants.

[0010] Furthermore, each of the two hydraulic sealing plugs at the open end of the compression cylinder is provided with a first sealing ring to form a seal with the compression cylinder; the movable piston between the two compression cylinders is also provided with a second sealing ring to form a seal with the compression cylinder. Through the above method, the sludge entering the compression cylinder is dehydrated by compression under sealed conditions.

[0011] Furthermore, the hydraulic sealing plug at the opening end of the compression cylinder is concave, and a filter plate with a pore size of 25-40um (using replaceable perforated stainless steel or porous ceramic filter element material) is installed at the opening end. The sludge water seeping out of the sludge in the compression cylinder under the pressure of the sludge feed pump flows out through the filter plate. Through the above-mentioned action, the water in the sludge is separated from the sludge.

[0012] Furthermore, the hydraulic sealing plug has a sludge inlet pipe that penetrates the plug body and the filter plate, and an external sludge feed pump pumps sludge into the cylinder to provide feeding and dewatering pressure; in addition, a filtrate pipeline is opened on the concave compression outer bottom surface to lead to the filtrate tank. The above scheme enables continuous operation of sludge feeding and filtrate discharge.

[0013] The present invention has the following beneficial effects: The present invention proposes a novel cylinder-type automatic sludge compression dewatering machine. This device achieves sludge dewatering through the extrusion of a mirror-symmetrical hydraulic mechanism on both sides. At the same time, sludge can be automatically discharged from the other compression cylinder while sludge is fed into one compression cylinder. This avoids the long downtime required for sludge discharge in traditional plate and frame dewatering machines to achieve the same low moisture content, thus enabling continuous dewatering and automated sludge discharge. This invention proposes a novel cylinder-type automatic sludge unloading sludge compression dewatering machine. The equipment introduces sludge through a sludge inlet pipe, and the water in the sludge is filtered using pressure generated by a sludge pump similar to that in plate and frame dewatering sludge pumps. This achieves high-pressure filtration with adjustable pressure and allows for easy adjustment of the sludge moisture content. Compared with the continuously dewatering screw press sludge dewatering machine, it achieves improved efficiency and lower moisture content. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure and idle / shutdown state of a novel automatic sludge unloading sludge compression dewatering machine proposed in this invention; Figure 2 This is a schematic diagram of the left-side feeding and pressing state of a novel automatic sludge unloading sludge compression dewatering machine proposed in this invention; Figure 3 This is a schematic diagram of the left compression cylinder of a novel automatic sludge unloading sludge compression dewatering machine proposed in this invention, showing the state of full sludge after compression. Figure 4 This is a schematic diagram of a novel automatic sludge unloading sludge compression dewatering machine proposed in this invention. The left compression cylinder is in the sludge discharge state while the right cylinder is switching to the sludge infeed state. Figure 5 This is a schematic diagram of a novel automatic sludge unloading and sludge compression dewatering machine proposed in this invention, showing the state where the left compression cylinder completes sludge discharge while the right side begins feeding and pressing sludge. Figure 6 This is a schematic diagram of the right compression cylinder completing the sludge compression state in a novel automatic sludge unloading and sludge compression dewatering machine proposed in this invention. Figure 7 This is a schematic diagram of a novel automatic sludge unloading sludge compression dewatering machine proposed in this invention, showing the right compression cylinder starting to unload sludge while simultaneously switching to the left sludge inlet state. Figure 8 This is a schematic diagram of a novel automatic sludge unloading and sludge compression dewatering machine proposed in this invention, showing the state where the right compression cylinder completes sludge unloading while the left compression cylinder begins sludge feeding. Figure 9 This is a schematic diagram of the left compression cylinder of a novel automatic sludge unloading and sludge compression dewatering machine proposed in this invention entering the next cycle of sludge compression and dewatering. Figure 10 This is a schematic diagram of the left and right compression cylinder connecting pistons of a novel automatic sludge unloading and sludge compression dewatering machine proposed in this invention; Figure 11 This is a schematic diagram of the hydraulic sealing plug of the compression cylinder of a novel automatic sludge unloading sludge compression dewatering machine proposed in this invention; Legend: 1. Left and right compression cylinder connecting pistons; 2. Left compression cylinder; 3. Right compression cylinder; 4. Left hydraulic sealing plug; 5. Right hydraulic sealing plug; 6. Left sludge inlet pipe; 7. Right sludge inlet pipe; 8. Left hydraulic press compression rod; 9. Right hydraulic press compression rod; 10. Left filtrate pipe; 11. Right filtrate pipe; 12. Left sludge tank; 13. Right sludge tank; 14. Filter plate support ring; 15. Inner layer of hydraulic sealing plug; 16. Filter plate. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the technical principles of the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Reference Figure 1-9 One embodiment of the present invention provides: A novel automatic sludge unloading sludge compression dewatering machine includes two sludge compression cylinders arranged in a mirror-symmetric manner. The sludge compression cylinders are cylindrical with one end open and are equipped with a concave hydraulic sealing plug. A filter plate is installed on the concave opening of the sealing plug. The two mirror-symmetric cylinders are connected by a movable piston. The maximum stroke of the movable piston in the two compression cylinders is the length of the compression cylinder.

[0017] (1) See Figure 1 Before starting the sludge dewatering machine, it is in an idle and stopped state. After starting, the right hydraulic press compression rod 9 is locked to ensure that the piston 1 connecting the left and right compression cylinders does not move. The left hydraulic press maintains a pressure slightly lower than the set fixed pressure of 1.5-2.0MPa, which is about 0.2MPa lower than the required moisture content of the dewatered sludge. The sludge pump pumps the raw sludge into the left compression cylinder 2 through the left sludge inlet pipe 6 for dewatering. The water in the sludge passes through the filter plate on the left hydraulic sealing plug 4 and is discharged through the left filtrate pipe 10. For the equipment operating status, please refer to [link to equipment operating status documentation]. Figure 2During this stage, because the sludge pump pressure is greater than the set pressure of the left hydraulic press, the left hydraulic press compression rod 8 continuously retracts in length as the sludge feeds into the left compression cylinder 2 until it reaches the minimum set length for the left cylinder to be full. Then, the left hydraulic press compression rod 8 is locked. The equipment operating status at this time is described in [reference needed]. Figure 3 Continue to maintain Figure 3 The pressure transmitter on the left sludge inlet pipe 6 rises to 1.5-2.0 MPa. Then, the equipment transitions to a new state. The left hydraulic press compression rod 8 releases its lock and retracts approximately 0.5m to the left, fully exposing the opening of the left compression cylinder 2. The right hydraulic press compression rod 9 remains locked. The left sludge feed pump stops or is switched via a valve to feed through the right sludge inlet pipe 7 to the right compression cylinder 3. The right cylinder gradually fills with sludge, pushing the piston 1 connecting the left and right compression cylinders to slowly move to the left, simultaneously expelling the dewatered sludge from the left compression cylinder 2. The dewatered sludge falls into the left sludge trough 12. For details on the equipment's operation during this process, please refer to [link to relevant documentation]. Figure 4 ; (2) When the left compression cylinder has finished unloading, the piston 1 connecting the left and right compression cylinders reaches its maximum leftward stroke. At this time, the equipment operating status is as follows: Figure 5 Note that although the sludge compression cylinder 3 on the right is also full at this time, the sludge inside the cylinder is basically in an un-dehydrated state because the dewatering pressure inside the cylinder is far from reaching the dewatering set value; continue to maintain this state. Figure 5 In operation, the sludge pump continuously feeds into the right-side compression cylinder 3 and provides dewatering pressure. The pressure inside the cylinder gradually increases, generating a dewatering effect. The filtrate flows out through the right-side hydraulic sealing plug 5 and the right-side filtrate pipe 11 until the pressure transmitter on the right-side sludge inlet pipe 7 increases to 1.5-2.0 MPa. At this point, it indicates that the sludge in the right-side compression cylinder 3 has reached the required moisture content. The set fixed pressure meets the moisture content requirement, and the pressure transmitter sends a signal to switch states. The left-side hydraulic sealing plug 4 moves to the right and attaches to the piston 1 connecting the left and right compression cylinders, switching to the sludge inlet state of the left compression cylinder. The operating state at this time is described in detail below. Figure 6 Then, the sludge unloading section of the right-side compression cylinder 3 begins. The right-side hydraulic sealing plug unlocks and retracts 0.5m to the right, fully exposing the opening of the left-side compression cylinder 2. The right-side sludge feed pump stops or is switched via a valve to feed through the left-side sludge inlet pipe 6, thus starting to feed into the left-side compression cylinder 2. This gradually fills the left-side cylinder with undewatered sludge, pushing the piston 1 connecting the left and right compression cylinders to slowly move to the right, simultaneously pushing out the dewatered sludge from the right-side compression cylinder 3 for unloading. The dewatered sludge falls into the right-side sludge trough 13. For the equipment operating status during this process, please refer to [link / reference needed]. Figure 7 During the process, a small amount of filtrate from the sludge in the left compression cylinder 2 flows out through the left hydraulic sealing plug 4 and the left filtrate pipe 10. (3) Continue to maintain Figure 7In this state, the sludge feed pump on the left continuously pumps sludge into the left compression cylinder 2, pushing the piston 1 connecting the left and right compression cylinders to move continuously to the right. This pushes all the dewatered sludge out of the right compression cylinder 3, achieving a state where sludge is discharged from the right compression cylinder while sludge continues to be fed into the left compression cylinder. (See [link to previous text]). Figure 8 Then, the right hydraulic press compression rod extends, pushing the right hydraulic sealing plug 5 to the left, attaching to the right side of the piston 1 connecting the left and right compression cylinders and locking it. This initiates the sludge dewatering stage in the left compression cylinder. A large amount of filtrate flows out through the left hydraulic sealing plug 4 and the left filtrate pipe 10. At this point, the equipment's operating status is as described in [reference needed]. Figure 9 Thus, the equipment has completed one cycle of alternating operation of the left and right compression cylinders to press mud.

[0018] (4) For analysis of other equipment accessories, please refer to Figure 10 and Figure 11 , Figure 10 This diagram illustrates the piston connecting the left and right compression cylinders. This assembly rigidly connects the two mirror-symmetrical compression cylinders. While sludge is being fed into one compression cylinder, it simultaneously pushes the other compression cylinder to discharge the already compressed and dewatered sludge. The operational process can be found in [reference needed]. Figure 4 , 7 8; Figure 11 Taking the left sealing plug 4 as an example, the whole structure is hollow. The cover plate is composed of filter plate support 14 and filter plate 16. The hollow concave bottom support 15 serves as the inner layer. The left sludge inlet pipe 6 passes through the hollow hydraulic sealing plug component 15 and filter plate 16, while the filtrate pipe 10 plays the role of exporting the sludge dewatering filtrate that has passed through the filter plate 16, without passing through the filter plate 16. Finally, it should be noted that the above description is only a preferred embodiment of the present invention and does not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make similar substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the technical principles of the present invention specification should be included within the protection scope of the present invention.

Claims

1. A novel automatic sludge compression and dewatering machine, comprising two sludge compression cylinders arranged in a mirror-symmetrical manner, characterized in that: Two cylindrical or rectangular compression cylinders, with one end open in a concave shape, are arranged in a mirror-symmetrical manner. A sealing plug is provided at the concave opening to provide the hydraulic press with the ability to move.

2. The novel automatic sludge unloading compression dewatering machine according to claim 1, characterized in that: The compression cylinders are arranged in a mirror-symmetrical manner with openings at the bottom. The two mirror-symmetrical cylinders are connected by a movable piston. The maximum stroke of the movable piston within the two compression cylinders is equal to the length within the compression cylinder.

3. The novel automatic sludge unloading compression dewatering machine according to claim 1, characterized in that: The sealing plug of the compression cylinder is hollow and concave. The inner side of the sealing plug has a filter plate facing into the compression cylinder, while the outer side of the sealing plug has two openings connected to pipes, which are respectively connected to the sludge feed pump and the filtrate pipe. The sludge feed pipe penetrates the sealing plug to enter the cylinder, while the filtrate pipe does not penetrate the sealing plug.

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