The hydraulic reciprocating mud scraper, also known as the bottom mud scraper, is the main equipment of the sedimentation tank. The hydraulic reciprocating bottom scraper installed at the bottom of the tank is used to scrape the sludge into the mud hopper, and then the air lift mixing and sludge discharge device installed in the mud hopper is used to discharge the sludge through the sludge discharge pipe.
Working Principle
The oil pump provides power to the hydraulic cylinder, and a set of triangular frames converts the vertical motion of the cylinder into horizontal motion. Finally, a set of wedge-shaped scrapers are driven to reciprocate at the bottom of the rectangular pool; The stroke of reciprocating motion is greater than the distance between a single scraper, which is equivalent to the transfer of sludge from the latter scraper to the previous one; The forward speed of the scraper group is approximately half of the backward speed; When moving forward, the concave surface of the wedge-shaped scraper pushes the accumulated mud towards the mud ditch of the pool in front; When retreating, a small wedge-shaped sharp angle will not drive the sludge to move backwards, while the negative pressure generated by the rapidly retreating concave surface will maintain the inertia of forward movement for a certain thickness of sludge layer. Therefore, when the scraper moves back and forth, there is a layer of sludge at the bottom of the pool that always moves forward until it falls into the sludge collection ditch.
Product Composition
Hydraulic Station
Equipped with different hydraulic devices. A single motor device is used for a single scraper, a dual motor device is used for a dual scraper, and a three motor device can also be provided.
Hydraulic devices require minimal maintenance, and any required maintenance is easily completed.
Using standard types of components makes it easy to purchase hydraulic components from local hydraulic component suppliers.
Standard hydraulic devices installed outdoors can achieve satisfactory performance at ambient temperatures (-20 ℃ -+45 ℃). When the ambient temperature is below 10 ℃, a heater is required (optional).
The flexible positioning: hydraulic device can be installed in a convenient position at the pool end and positioned within 30 meters of the hydraulic cylinder. This flexibility is easier to adapt to the renovation of existing sedimentation tanks, without being affected by surrounding factors such as walkways and dimensions.
According to environmental requirements, different hydraulic oils can be used, and the water plant can use harmless grade oils.
High density polypropylene guide rail
According to the width of the pool, 3-5 polypropylene wear-resistant plates are set, and stainless steel sliding plates slide longitudinally on the polypropylene wear-resistant plate. The wear is reduced to very small due to water lubrication, and the wear-resistant plate usually has a service life of about five to ten years.
Structure of the air stripping device
1. The mud collection ditch is divided into several mud collection buckets.
2. Install a lifting pipe and a set of bridge breaking devices for each mud collection hopper.
3. Ball valve F1 is normally open and only closes when repairing electric ball valve D1.
4. When the water production capacity of the sedimentation tank increases and the inlet turbidity of the sedimentation tank increases, it is only necessary to adjust the working cycle of the air stripping and sludge discharge device in a timely manner.
Introduction to Other Supporting Selection
The hydraulic reciprocating mud scraper can be equipped with an optional air lift mud discharge device, replacing traditional mud discharge devices such as pump suction, siphon suction, and gravity mud discharge.
The main features are:
1. The “air lift” is not limited by the depth conditions of the pool, and various depths of the pool can be used.
2. The lower mouth of the “air lift” is completely submerged by sludge, which can discharge high concentration sludge at the bottom.
3. The sludge discharged by the “air lift” can be seen and touched, making it convenient for the operator to control the sludge discharge cycle.
4. Maintenance-free: The “air lift” equipment has no mechanical, electrical, rotating, high-pressure, or wear components under the water surface.
5. Each air lift tube only requires a small amount of compressed air to operate.
Product Characteristic
1. Few moving parts: During operation, the hydraulic reciprocating pool bottom scraper only has a combination of pool bottom scraper plates, push rods, and triangular arm frames in motion;
2. Minimal and convenient maintenance, long service life; Less moving parts, easy maintenance. The wear-resistant guide rail is made of high-density polyethylene, and all materials submerged in water are made of stainless steel. The stainless steel scraper slides on the wear-resistant guide rail, and water is a natural lubricant with low friction, low power demand, sensitive operation, and long service life;
3. Continuous sludge transportation: Regardless of whether the scraper combination is in the forward or return process, the bottom sludge always flows forward and never intermittently, forming a stable inertial flow;
4. The sedimentation process is uninterrupted: the scraping speed of the mud scraper is very slow, and it moves in the lower layer of the sludge, without stirring the upper layer of the sludge, leading to the interruption of the sedimentation process;
5. High motion reliability: fewer moving parts, slow speed, natural water lubrication, high motion reliability;
6. Strong applicability: Whether it is a new sedimentation tank or an existing sedimentation tank, as long as the bottom of the tank is square and the flatness is within the allowable range, or even the bottom is inclined, whether it is a pull type, push type, single layer, double layer, or using inclined tube sedimentation, it can demonstrate satisfactory performance. Even the hydraulic cylinder can be placed horizontally below the water surface, so that the moving parts can be reduced from four to one. Not limited by the position of the power system, it can even be installed in a pool with columns;
7. Easy installation: simple structure, small components, no need for lifting equipment or other complex devices to install;
8. Sludge concentration function: The unique and novel fluid power design enables the scraper to concentrate sludge during repeated movements. The solid content of discharged sludge can be as high as 3-7%, while the solid content of sludge collected by other forms of sludge scrapers is usually between 0.6-1%, reducing sludge emissions. In terms of sludge treatment, both the sludge inlet pump and sludge dewatering equipment can use smaller models of equipment, reducing investment and operating costs. In a water plant, when the solid content of sludge reaches 3%, subsequent sludge thickening facilities or equipment can be reduced. The sludge discharged from the bottom can directly enter the dewatering machine for dehydration, thereby reducing the civil construction cost and land occupation of the sludge thickening tank.
Model & Specifications
| Name | Hydraulic cylinder diameter(mm) | Type | Scope of use(m2) | Power(KW) | |
| Wall mounted | Flat seat type | ||||
| LD | Φ70 | B | P | Below 200 | 1.5-2.2 |
| Φ85 | 200-600 | 3.75-4 | |||
| Φ100 | 600-1000 | 5.5 | |||
| Φ115 | 1000-1200 | 7.5-11 | |||
| Sludge properties | It can be applied to most sludge with a solid content of 0.5% -6% | ||||
| Size | Maximum length=100m, maximum width=12m, maximum surface area=1200m2 | ||||
| Material | SUS304 stainless steel or SUS316 acid resistant steel | ||||
