Plunger pump for conveying sludge

Abstract

The utility model discloses a plunger pump for conveying sludge, which belongs to the technical field of plunger pumps, is connected with a sludge hopper and a screw feeder to realize sludge conveying, and comprises two main driving oil cylinders, a cooling water tank, two conveying cylinders and a monitoring control system, the spiral feeder is used for continuously feeding materials into the sludge hopper; a conversion pipe is arranged in the sludge hopper; the conveying pistons in the two conveying cylinders alternately stretch out and draw back and convey sludge into an outlet pipeline arranged on the sludge hopper through a conversion pipe; the monitoring control system is used for monitoring the leakage problem in the operation process and controlling the feeding speed of the screw feeder. The plunger pump for conveying the sludge can effectively solve the problems that leakage of hydraulic oil of a main driving oil cylinder of a plunger pump in the prior art cannot be found in time, and the service life of equipment is shortened due to dry grinding of a cavity of a material conveying cylinder caused by unstable conveying of a screw feeder.

Description

Technical Field

[0001] This utility model belongs to the field of plunger pump technology. Specifically, it relates to a plunger pump for sludge transportation. Background Technology

[0002] For plunger pumps used in wastewater treatment and sludge incineration industries, domestic plunger pumps are mainly from Schwing and Putzmeister. The pumping of the medium is primarily accomplished by the movement of a central pump. The central pump mainly consists of a main drive cylinder, cooling water tank, conveying cylinder, sludge hopper, spectacle plate inside the hopper, agitator, C-type or S-type reversing pipe, and an oscillating cylinder outside the hopper. The central pump, connected to the main drive cylinder and conveying cylinder via the cooling water tank, moves back and forth under controlled pressure, simultaneously driving the connected conveying cylinder to move back and forth synchronously. The oscillation within the sludge hopper, coordinated with the movement of the main drive cylinder and conveying cylinder via the reversing pipe, pushes the medium out, achieving the purpose of material conveying. The cooling water tank primarily cools the piston of the main drive cylinder. During operation, the cooling water overflows in the cooling water tank, continuously replenishing the water supply to cool the piston. Routine inspection personnel cannot promptly detect cold water contamination, making it impossible to provide early warning of hydraulic oil leaks in the conveying cylinder or main drive cylinder. The screw feeder uses a proportional adjustment card (program setting) to match the screw speed to the frequency of the central pump at a fixed ratio, conveying sludge from the storage bin to the sludge hopper, continuously supplying sludge to the central pump. However, fluctuations in the sludge moisture content directly affect the screw feed rate, resulting in unstable sludge conveying by the central pump under a fixed ratio due to insufficient screw feed. This often leads to insufficient filling of the sludge hopper (fully enclosed), causing dry grinding in the conveying cylinder cavity. The stability of the screw feed determines whether the central pump can operate stably. Utility Model Content

[0003] The purpose of this utility model is to provide a plunger pump for sludge conveying, addressing the aforementioned shortcomings. This solves problems such as the inability to detect hydraulic oil leakage in the main drive cylinder of existing plunger pumps, and the unstable conveying of screw feeders causing dry friction in the conveying cylinder cavity, leading to a reduced equipment lifespan. To achieve the above objective, this utility model provides the following technical solution:

[0004] A plunger pump for sludge conveying, connected to a sludge hopper and a screw feeder, includes two main drive cylinders, a cooling water tank, two conveying cylinders, and a monitoring and control system. The drive pistons of the main drive cylinders are connected to the conveying pistons in the conveying cylinders via the cooling water tanks, driving the conveying pistons in the conveying cylinders to move. The screw feeder continuously feeds sludge into the sludge hopper. A conversion pipe is provided inside the sludge hopper. The conveying pistons in the two conveying cylinders alternately extend and retract, conveying sludge through the conversion pipes to an outlet pipe provided on the sludge hopper. The monitoring and control system is used to monitor leakage problems during operation and control the feeding speed of the screw feeder.

[0005] Furthermore, the conversion pipe is equipped with a swing cylinder, which drives the conversion pipe to swing on the side away from the outlet pipe, alternately communicating with two conveying cylinders; the conveying cylinders suck up sludge from the sludge hopper by contraction.

[0006] Furthermore, the monitoring and control system includes an oil stain monitoring device installed on the cooling water tank, which determines whether hydraulic oil leakage has occurred in the main drive cylinder by monitoring the oil stains in the cooling water tank.

[0007] Furthermore, the cooling water tank is provided with water inlet holes and drain holes on both sides of the bottom, overflow holes on the side walls, and a cover plate on the top for sealing.

[0008] Furthermore, the monitoring and control system also includes a temperature sensor and a regulating valve; the regulating valve is installed at the water inlet of the cooling water tank; the temperature sensor is used to detect the water temperature in the cooling water tank, thereby controlling the opening degree of the regulating valve.

[0009] Furthermore, the monitoring and control system also includes a pressure sensor; the pressure sensor is installed inside the sludge hopper to detect the pressure inside the sludge hopper and to provide feedback to control the rotational speed of the screw feeder, ensuring that the sludge hopper is full.

[0010] Furthermore, the sludge hopper is equipped with an automatic exhaust device.

[0011] Furthermore, the diameter of the conveying cylinder is consistent with the inlet diameter of the conveying cylinder connected to the sludge hopper.

[0012] Furthermore, the monitoring and control system also includes a controller; the controller is electrically connected to the automatic exhaust device, the oil stain monitoring device, the main drive cylinder, the pressure sensor, the screw feeder, and the regulating valve.

[0013] The beneficial effects of this utility model are:

[0014] This invention features an oil stain monitoring device installed on the cooling water tank. The presence of oil in the cooling water indicates a leak in the hydraulic oil of the main drive cylinder, allowing for timely equipment maintenance and preventing equipment failure due to prolonged leakage, thus extending the equipment's lifespan. A temperature sensor and regulating valve on the cooling water tank provide feedback control. Temperature detection adjusts the opening of the regulating valve at the inlet, ensuring efficient use of cooling water and avoiding the waste caused by an excessively large valve opening or insufficient cooling. The sludge hopper is equipped with an automatic venting device, pressure sensor, and controller, shortening the equipment's restart time. Pressure changes in the hopper control the screw speed of the screw feeder, improving both conveying efficiency and adaptability to sludge with varying moisture content. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram showing the connection between the expanded conveying cylinder of this utility model and the cooling water tank and sludge hopper respectively;

[0017] Figure 3 This is a schematic diagram showing the connection of the conveying cylinder to the cooling water tank and the sludge hopper in the prior art of this utility model;

[0018] In the attached diagram: 1. Sludge hopper; 2. Screw feeder; 3. Main drive cylinder; 4. Cooling water tank; 5. Conveying cylinder; 6. Conveying piston; 7. Oil stain monitoring device; 8. Temperature sensor; 9. Pressure sensor; 10. Automatic exhaust device; 11. Variable diameter pipe seat. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Example:

[0022] See attached Figures 1-3A plunger pump for sludge conveying continuously transports sludge from a sludge silo to a sludge hopper 1 via a screw feeder 2. A conveying cylinder 5 is sealed to both a cooling water tank 4 and the sludge hopper 1. A main drive cylinder 3 is sealed to the conveying cylinder 5 via the cooling water tank 4, driving the conveying piston 6 of the conveying cylinder 5 to convey materials. The cooling water tank 4 is used to cool the drive piston within the main drive cylinder 3, thereby extending the service life of the main drive cylinder 3. The screw feeder 2 has its inlet connected to the sludge silo and its outlet connected to the sludge hopper 1. The sludge hopper 1 is equipped with a switching pipe, preferably a C-type or S-type switching pipe. The switching pipe is controlled by a swing cylinder. The sludge hopper 1 has an inlet connected to two conveying cylinders 5. One end of the switching pipe is alternately connected to the two inlets by the swing cylinder, and the other end is always connected to the outlet pipe. During operation, the screw feeder 2 first conveys the sludge into the sludge hopper 1 and ensures that it is full. The inlet of one of the conveying cylinders 5 is open. The conveying piston 6 retracts and sucks the sludge into the conveying cylinder 5. The swing cylinder drives the switching pipe to connect with the conveying cylinder 5 filled with sludge. At this time, the conveying piston 6 extends and conveys the sludge through the switching pipe to the outlet pipe to complete the sludge conveying. At the same time, the other conveying cylinder 5 performs the process of sucking the sludge. The two conveying cylinders 5 work together with the swing cylinder to alternately swing the switching pipe to achieve direction switching and realize the continuous conveying of sludge to the outlet pipe. The main drive cylinder 3 is driven by hydraulic oil. To promptly detect hydraulic oil leaks, a monitoring and control system is further implemented. This system includes a controller and an oil contamination monitoring device 7 electrically connected to it. The oil contamination monitoring device 7 is installed on the cooling water tank 4. By detecting whether the cooling water in the cooling water tank 4 contains oil, it determines whether the main drive cylinder 3 is leaking. This allows for timely detection of leaks in the main drive cylinder 3, and the feedback signal is sent to the controller to stop the main drive cylinder 3 and the screw feeder 2, enabling timely equipment maintenance. The monitoring and control system also includes a pressure sensor 9 installed on the sludge hopper 1. The sludge hopper 1 is fully enclosed. The pressure sensor 9 detects the pressure inside the sludge hopper 1 to determine whether the hopper 1 is full. This information is then fed back to the controller to control the rotational speed of the screw feeder 2, maintaining a constant positive pressure in the sludge hopper 1 and adjusting the conveying capacity of the screw feeder 2 in real time.

[0023] The cooling water tank 4 has inlet and outlet holes on both sides of its bottom, and an overflow hole near the top of its side wall. The top is sealed by a cover plate. During operation, the outlet hole is closed, while the inlet and overflow holes are open, allowing cooling water to overflow within the cooling water tank 4, continuously replenishing the cooling water to cool the drive piston of the main drive cylinder 3. The monitoring and control system also includes a temperature sensor 8 and a regulating valve. The temperature sensor 8 is located on the cooling water tank 4 to detect the temperature of the cooling water. The regulating valve is located at the inlet hole. The temperature changes of the cooling water in the cooling water tank 4 are fed back to the controller, which controls the opening of the regulating valve to adjust the water consumption, avoiding waste due to excessive valve opening or insufficient cooling due to insufficient valve opening, thus maximizing water conservation.

[0024] An automatic venting device 10 is installed on the sludge hopper 1. Controlled by a controller, the sludge hopper 1 is in a fully enclosed state during equipment operation. After each maintenance, the air inside the sludge hopper 1 cannot be vented in time, causing the screw feeder 2 to be affected by pressure and slowing down the feeding speed. The equipment needs to run for a longer time before it can resume normal production. The automatic venting device 10 vents the air in time after maintenance, allowing the equipment to quickly return to normal operation. The automatic venting device 10 allows air to pass through but not sludge, ensuring that the air inside the hopper is vented in time while also sealing the sludge conveyed by the screw feeder to prevent leakage.

[0025] In the prior art, the conveying cylinder 5 is connected to the cooling water tank 4 and the sludge hopper 1 respectively through the variable diameter pipe seat 11. That is, the cylinder diameter of the conveying cylinder 5 is smaller than the inlet diameter of the sludge hopper 1 and the conveying cylinder 5. This utility model eliminates the variable diameter cylinder seat, and the conveying cylinder 5 is directly connected to the inlet of the sludge hopper 1. Correspondingly, the cylinder diameter of the conveying cylinder 5 and the diameter of the conveying piston 6 are expanded. Higher strength materials are used to improve the strength of the conveying cylinder 5. The sludge conveyed by the expanded conveying cylinder 5 is increased in a single conveying. When the total amount of sludge to be conveyed is fixed, the operating frequency of the conveying piston 6 of the conveying cylinder 5 can be reduced, which improves the transportation capacity of the equipment, extends the replacement cycle of parts, and reduces the operating cost of the equipment.

[0026] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A plunger pump for sludge conveying, connected to a sludge hopper (1) and a screw feeder (2) to achieve sludge conveying, characterized in that: It includes two main drive cylinders (3), a cooling water tank (4), two conveying cylinders (5), and a monitoring and control system; the drive piston of the main drive cylinder (3) is connected to the conveying piston (6) in the conveying cylinder (5) through the cooling water tank (4), and the drive piston of the main drive cylinder (3) drives the conveying piston (6) in the conveying cylinder (5) to move; the screw feeder (2) continuously feeds material into the sludge hopper (1); the sludge hopper (1) is equipped with a conversion pipe; the conveying pistons (6) in the two conveying cylinders (5) alternately extend and retract, and convey the sludge to the outlet pipe set on the sludge hopper (1) through the conversion pipe; the monitoring and control system is used to monitor leakage problems during operation and control the feeding speed of the screw feeder (2).

2. The plunger pump for sludge conveying according to claim 1, characterized in that: The switching pipe is equipped with a swing cylinder, which is used to drive the switching pipe to swing on the side away from the outlet pipe, and alternately connect with two conveying cylinders (5); the conveying cylinders suck up the sludge in the sludge hopper (1) by contraction.

3. A plunger pump for sludge conveying according to claim 2, characterized in that: The monitoring and control system includes an oil stain monitoring device (7), which is installed on the cooling water tank (4) to determine whether hydraulic oil leakage has occurred in the main drive cylinder (3) by monitoring the oil stains in the cooling water tank (4).

4. A plunger pump for sludge conveying according to claim 3, characterized in that: The cooling water tank (4) has an inlet hole and a drain hole on both sides of the bottom, an overflow hole on the side wall, and a cover plate on the top for sealing.

5. A plunger pump for sludge conveying according to claim 4, characterized in that: The monitoring and control system also includes a temperature sensor (8) and a regulating valve; the regulating valve is located at the water inlet of the cooling water tank (4); the temperature sensor (8) is used to detect the water temperature in the cooling water tank (4) and thereby control the opening of the regulating valve.

6. A plunger pump for sludge conveying according to claim 5, characterized in that: The monitoring and control system also includes a pressure sensor (9); the pressure sensor (9) is installed in the sludge hopper (1) to detect the pressure in the sludge hopper (1) and to provide feedback control of the rotation speed of the screw feeder (2) to ensure that the sludge hopper (1) is full.

7. A plunger pump for sludge conveying according to claim 6, characterized in that: The sludge hopper (1) is equipped with an automatic exhaust device (10).

8. A plunger pump for sludge conveying according to claim 7, characterized in that: The diameter of the conveying cylinder (5) is the same as the inlet diameter of the conveying cylinder (5) connected to the sludge hopper (1).

9. A plunger pump for sludge conveying according to claim 8, characterized in that: The monitoring and control system also includes a controller; the controller is electrically connected to the automatic exhaust device (10), the oil stain monitoring device (7), the main drive cylinder (3), the pressure sensor (9), the screw feeder (2), and the regulating valve.

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