Centrifugal rotation hydraulic control system

Abstract

The utility model relates to a centrifugal rotation hydraulic control system which comprises an oil tank, a proportioning pump, a filter, an oil return pipeline and a pipeline, the oil tank is connected with an inlet of the proportioning pump through the pipeline, an outlet of the proportioning pump is connected with an inlet of the filter, an outlet of the filter is respectively connected with two groups of hydraulic motors through the pipeline, and the hydraulic motors are connected with the oil tank through the oil return pipeline. The device has the advantages that a synchronous diverter valve is not adopted any more, a synchronization function is cancelled, normal work of the two sets of hydraulic motors is not affected, rigid lever synchronization is achieved only through the cast pipe, the requirement for long-term stable production of the cast pipe lining can be met no matter whether the two sets of carrier rollers are abraded or not, the overhaul work intensity is remarkably reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of ductile iron pipe production, in particular to a centrifugal rotary hydraulic control system. Background Art

[0002] At present, the production of ductile iron pipe lining adopts the centrifugal rotation process, that is, during the production process, the lining material (such as cement) is adsorbed onto the inner wall of the pipe through the centrifugal force generated by the high-speed rotation of the pipe. In the centrifugal rotation process of cast pipes, the centrifugal force drive device is composed of a set of hydraulic transmission system. The hydraulic motor drives the roller to rotate, and the roller drives the cast iron pipe to rotate at high speed under the control of the pressure roller, and the coating is evenly adsorbed on the inner wall of the cast iron metal pipe through the centrifugal force.

[0003] The existing hydraulic transmission system uses a synchronous diverter valve to divert hydraulic oil to the hydraulic motor. The flow diverted to the two sets of hydraulic motors is the same, and the motor speed is synchronized. The two sets of motors drive the rollers at the same speed. Because the outer circles of the two sets of rollers are worn after working for a period of time, the different degrees of wear lead to different linear speeds of the two rollers; the 6-meter-long cast iron pipe cannot guarantee that the weight or outer diameter of each size section of the 6-meter-long pipe body is the same. Therefore, there is a deviation between the flow output by the synchronous diverter valve and the flow required for the rotation of the cast iron pipe. Due to the high-speed rotation, the flow deviation in the synchronous diverter valve body cannot be eliminated in time, and a local high pressure is instantly formed in the cavity of the synchronous diverter valve (the valve body is a closed space), which is converted from high pressure to pressure shock. After a long time, the valve body is subjected to different pressure shocks many times, which eventually leads to the cracking of the synchronous diverter valve body. Under the premise that the equipment meets the production quality, the damage to the equipment components caused by this operating condition will increase, and eventually lead to failure. The above-mentioned valve body cracking is a phenomenon.

[0004] The reason is that two synchronization functions occur at the same time under the same working condition, hydraulic diverter valve synchronization and rigid lever synchronization (cast pipe product specifications are DN300-800, length is 6 meters, weight is 0.3-1.4 tons, and the metal body of the cast pipe is equivalent to the rigid lever). The simultaneous occurrence of two identical functions in mechanical transmission is called over-synchronization, which will damage the equipment components. The cracking of the hydraulic valve body is the result of over-synchronization. Equipment damage occurs in weak links. If the valve body does not crack, other components will also be damaged. Hydraulic parts-synchronous diverter valve After the hydraulic system has been running for a period of time, the valve body of the synchronous diverter valve cracks, causing hydraulic failures, increasing the intensity of maintenance and overhaul, and increasing equipment downtime due to hydraulic system reasons. Summary of the invention

[0005] The utility model aims to provide a centrifugal rotary hydraulic control system to meet the needs of long-term stable production of cast pipe linings and reduce the intensity of maintenance work.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A centrifugal rotary hydraulic control system comprises an oil tank, a proportional pump, a filter, an oil return pipeline and a pipeline. The oil tank is connected to the inlet of the proportional pump through a pipeline, the outlet of the proportional pump is connected to the inlet of the filter, the outlet of the filter is respectively connected to two groups of hydraulic motors through pipelines, and the hydraulic motor is connected to the oil tank through the oil return pipeline.

[0008] The oil return pipeline is connected with an oil return filter.

[0009] A safety valve is connected between the proportional pump and the filter via a pipeline.

[0010] A pressure detection device is installed on the pipeline between the proportional pump and the filter.

[0011] The bottom of the oil tank is connected with a drain valve.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The centrifugal rotary hydraulic control system no longer uses a synchronous diverter valve, canceling a synchronization function without affecting the normal operation of the two sets of hydraulic motors. The rigid lever synchronization is only achieved by the cast pipe. Regardless of whether the two sets of rollers are worn, it can meet the needs of long-term stable production of cast pipe linings, significantly reducing the intensity of maintenance work and extending the equipment service life.

[0014] 2. The centrifugal rotary hydraulic control system requires little investment, has a simple structure, is easy to diagnose when a fault occurs, and reduces spare parts costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the relative positions of the casting pipe and the pressure roller.

[0017] Figure 3 yes Figure 2 Section view along line AA.

[0018] In the figure: 1-oil tank 2-proportional pump 3-safety valve 4-filter 5-hydraulic motor 6-return oil filter 7-casting pipe 8-support roller 9-pressure roller 10-pipeline 11-return oil pipeline 12-pressure detection device. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0020] See Figure 1-Figure 3 A centrifugal rotary hydraulic control system includes an oil tank 1, a proportional pump 2, a filter 4, an oil return pipeline 11, a hydraulic motor 5, an oil return filter 6, and a pipeline. The oil tank 1 is connected to the inlet of the proportional pump 2 through a pipeline, and the outlet of the proportional pump 2 is connected to the inlet of the filter 4. The outlet of the filter 4 is connected to two groups of hydraulic motors 5 through a pipeline 10 and a three-way pipe fitting, respectively. The two groups of hydraulic motors 5 are connected to the oil tank 1 through the oil return pipeline 11 and the oil return filter 6. The synchronous diverter valve is not used, and the long-term stable production requirements of the cast pipe 7 liner are met through operation.

[0021] Among them, the return oil filter 6 is connected to the return oil pipeline 11. A safety valve 3 is connected between the proportional pump 2 and the filter 4 through a pipeline, and the outlet of the safety valve 3 can be connected to the oil tank 1 through a pipeline, so that the overloaded hydraulic oil can be discharged and returned to the oil tank 1. The rated pressure of the filter 4 is 31.5MPa, and the working pressure is 18-25MPa; the rated pressure of the return oil filter 6 is 1MPa, and the return oil pressure is 0-1MPa. In addition, a pressure detection device 12 is installed on the pipeline between the proportional pump 2 and the filter 4 to detect the pressure of the hydraulic oil flowing through the pipeline. A drain valve is connected to the bottom of the oil tank 1 to discharge the hydraulic oil and impurities in the oil tank 1.

[0022] Working process of centrifugal rotating hydraulic control system: the motor with power of 120kW drives the proportional pump 2 to output hydraulic pressure, and distributes the hydraulic oil to two synchronous hydraulic motors 5 through the safety valve 3 and filter 4. The hydraulic energy is converted into mechanical energy by the output of the hydraulic motor 5 to drive the roller 8 to complete the hydraulic transmission work. The two sets of hydraulic motors 5 drive the two rollers 8 to rotate, and the rollers 8 drive the cast iron pipe to rotate centrifugally at high speed under the pressure roller 9, and the coating is evenly adsorbed on the inner wall of the cast iron metal pipe through centrifugal force. The hydraulic oil is returned to the oil tank 1 by the hydraulic motor 5 through the return oil pipeline 11 and the return oil filter 6, completing a working cycle.

[0023] The utility model has a simple structure, low investment, easy fault diagnosis, and reduced spare parts cost. The original hydraulic control system is simplified without losing the use function, meeting the production needs, and obtaining better results with the least investment. The hydraulic control system no longer uses a synchronous diverter valve, cancels a synchronization function, does not affect the normal operation of the two groups of hydraulic motors 5, and only uses the cast pipe 7 to achieve rigid lever synchronization. Regardless of whether the two groups of rollers 8 are worn, the needs of long-term stable production of the cast pipe 7 lining can be met, which significantly reduces the maintenance work intensity and prolongs the equipment operation life.

[0024] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention; they cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanation here; technicians in this field can think of other specific implementation methods of the present invention without creative work; these methods will fall within the protection scope of the present invention.

Claims

1. A centrifugal rotary hydraulic control system, characterized in that: It includes an oil tank, a proportional pump, a filter, an oil return line, and a pipeline. The oil tank is connected to the inlet of the proportional pump through a pipeline, the outlet of the proportional pump is connected to the inlet of the filter, the outlet of the filter is connected to two groups of hydraulic motors through pipelines, and the hydraulic motor is connected to the oil tank through the oil return line.

2. A centrifugal rotary hydraulic control system according to claim 1, characterized in that: The oil return pipeline is connected with an oil return filter.

3. A centrifugal rotary hydraulic control system according to claim 1, characterized in that: A safety valve is connected between the proportional pump and the filter via a pipeline.

4. A centrifugal rotary hydraulic control system according to claim 1, characterized in that: A pressure detection device is installed on the pipeline between the proportional pump and the filter.

5. A centrifugal rotary hydraulic control system according to claim 1, characterized in that: The bottom of the oil tank is connected with a drain valve.

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