Pipeline structure of flotation slag removal machine

Abstract

The utility model discloses a pipeline structure of a flotation slag removal machine, which comprises the flotation slag removal machine, a slurry inlet is arranged on the side wall of the flotation slag removal machine, and the slurry inlet is connected with a slurry inlet pump through a slurry inlet pipe; a light slag outlet is formed in the top wall of the flotation slag removal machine and is connected with the impurity separator through a light slag pipeline; a pulp outlet and a heavy slag outlet are formed in the bottom wall of the flotation slag removal machine, and the pulp outlet is connected with the pulper through a pulp outlet pipe; the heavy slag outlet is connected with a pulper slag well through a heavy slag pipeline; a first switch valve, a second switch valve and an exhaust vacuum breaking pipe are sequentially arranged on the heavy slag pipeline in the heavy slag flowing direction. According to the utility model, the exhaust vacuum breaking pipe is arranged on the heavy slag pipeline, so that the pressure in the heavy slag pipeline is consistent with that of the outside, when the second switch valve is opened, the heavy slag pipeline cannot be impacted by air pressure to generate vibration, and the problems of vibration and noise when the flotation slag removal machine is used for removing heavy slag are solved.

Description

Technical Field

[0001] This utility model belongs to the field of waste paper pulping and relates to a pipeline structure for a flotation cleaning machine, specifically a pipeline structure that solves the vibration and noise problem when heavy residue is discharged from the flotation cleaning machine. Background Technology

[0002] With the rapid development of the paper industry, the production and consumption of packaging paper have grown rapidly along with the development and expansion of e-commerce and express logistics. Waste OCC raw materials are being used more and more often, and the impurities they carry are also increasing. As an important part of the coarse screening section, the flotation cleaning machine plays a crucial role in the removal of both heavy and light slag.

[0003] The flotation sludge remover is designed at the end of the coarse screening system. It is a vertical, closed, pressurized device that decomposes the slurry from the coarse screening. The good slurry is returned to the pulper or the second coarse screening stage upstream. The light sludge at the top enters the impurity separator, and the heavy sludge at the bottom is discharged to the pulper's sludge well. The minimum inlet pressure of this device is 250 kPa. To prevent the screen plates from clogging, the normal operating pressure differential is 60–100 kPa. The heavy sludge pipeline is equipped with a switch valve for control. Due to the small amount of heavy sludge and to reduce fiber loss, the switch valve operates intermittently, discharging the sludge into the pulper's sludge well intermittently. Because the equipment is pressurized, when the switch valve is opened to discharge heavy sludge, the pressurized pipeline can easily generate significant noise and cause the welded joints between the pipeline and the equipment to detach. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned problems in the existing technology by providing a pipeline structure for a flotation cleaning machine, including a flotation cleaning machine. The flotation cleaning machine has a slurry inlet on its side wall, which is connected to a slurry pump via a slurry inlet pipe. The top wall of the flotation cleaning machine has a light slag outlet, which is connected to an impurity separator via a light slag pipe. The bottom wall of the flotation cleaning machine has a slurry outlet and a heavy slag outlet. The slurry outlet is connected to a pulper via a slurry outlet pipe. The heavy slag outlet is connected to the pulper's slag well via a heavy slag pipe. A first switching valve, a second switching valve, and an exhaust / vacuum breaking pipe are sequentially arranged along the heavy slag flow direction on the heavy slag pipe.

[0005] The exhaust vacuum breaking pipe is set vertically, and its height exceeds that of the flotation cleaning machine.

[0006] The exhaust vacuum breaking pipe is equipped with a check valve and a ball valve.

[0007] The exhaust vacuum breaking pipe is made of stainless steel.

[0008] The diameter of the exhaust vacuum breaking pipe is DN25-DN40.

[0009] A first pressure transmitter is installed on the slurry inlet pipe.

[0010] The slurry outlet pipe is equipped with a second pressure transmitter and a pressure regulating valve.

[0011] A flow transmitter is installed on the light slag pipeline.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] 1. This utility model sets an exhaust and vacuum breaking pipe on the heavy slag pipeline so that the pressure inside the heavy slag pipeline is the same as the outside pressure. When the second switch valve is opened, the heavy slag pipeline will not be subjected to air pressure impact and will not vibrate, thus solving the vibration and noise problem of the flotation cleaning machine when discharging heavy slag.

[0014] 2. This utility model has a simple structure and is easy to operate. Attached Figure Description

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

[0016] Among them, 1-flotation cleaning machine, 101-slurry inlet, 102-slurry outlet, 103-heavy slag outlet, 104-light slag outlet, 2-slurry pump, 3-slurry inlet pipe, 301-first pressure transmitter, 4-slurry outlet pipe, 401-second pressure transmitter, 402-pressure regulating valve, 5-heavy slag pipeline, 501-first switch valve, 502-second switch valve, 503-exhaust vacuum breaking pipe, 504-check valve, 505-ball valve, 6-pulverizer slag well, 7-light slag pipeline, 8-impurity separator, 9-flow transmitter, 10-pulverizer. Detailed Implementation

[0017] To facilitate understanding and implementation of this utility model by those skilled in the art, the present utility model will be further described in detail below with reference to embodiments. The embodiments described herein are only for illustration and explanation and are not intended to limit the present utility model.

[0018] Example 1:

[0019] like Figure 1 As shown, a pipeline structure of a flotation cleaning machine includes a flotation cleaning machine 1. A screen plate is installed at the bottom of the flotation cleaning machine 1. The screen plate is equivalent to a small pulper, and its main function is to collect light impurities, loosen the slurry, collect and remove heavy impurities. The flotation cleaning machine 1 is a vertical closed pressurized device that loosens and processes the slurry from the coarse screen to remove light and heavy impurities.

[0020] The flotation cleaning machine 1 has a slurry inlet 101 on its side wall. The slurry inlet 101 is connected to the slurry pump 2 through the slurry inlet pipe 3. After dilution, the slurry from the second coarse screen is diluted to obtain a slurry with a mass percentage concentration of about 1.5%. The slurry is transported to the slurry inlet 101 through the slurry pump 2. A first pressure transmitter 301 is installed on the slurry inlet pipe 3. The motor of the slurry pump 2 is a variable frequency motor. By monitoring the first pressure transmitter 301 and adjusting the variable frequency motor of the slurry pump 2, the pressure in the slurry inlet pipe 3 can be kept at a normal or set state.

[0021] The bottom wall of the flotation cleaning machine 1 is provided with a slurry outlet 102. The slurry outlet 102 is connected to the pulper 10 through the slurry outlet pipe 4. The slurry after slag removal is discharged from the slurry outlet 102 and flows into the pulper 10 through the slurry outlet pipe 4. The slurry outlet pipe 4 is provided with a second pressure transmitter 401 and a pressure regulating valve 402. The pressure in the slurry outlet pipe 4 is monitored by the second pressure transmitter 401, and the pressure in the slurry inlet pipe 3 can be kept at the normal state or the set state by adjusting the pressure regulating valve 402.

[0022] The bottom wall of the flotation cleaning machine 1 is also provided with a heavy slag outlet 103. The heavy slag outlet 103 is connected to the pulper slag well 6 through the heavy slag pipe 5. The heavy slag at the bottom of the flotation cleaning machine 1 is discharged from the heavy slag outlet 103 and discharged to the pulper slag well 6 through the heavy slag pipe 5. A first switch valve 501, a second switch valve 502 and an exhaust vacuum breaking pipe 503 are arranged sequentially on the heavy slag pipe 5 along the heavy slag flow direction. When the flotation cleaning machine 1 is in the non-slag discharge state, the first switch valve 501 is open and the second switch valve 502 is closed. When the flotation cleaning machine 1 is in the slag discharge state, the first switch valve 501 is closed and the second switch valve 502 is open.

[0023] Without the exhaust and vacuum breaking pipe 503, a vacuum exists inside the heavy slag pipeline 5. At the moment the second switch valve 502 opens, the heavy slag pipeline 5 is impacted by the air pressure, which causes vibration and noise. The vibration of the heavy slag pipeline 5 can easily cause it to detach from the interface between the heavy slag pipeline 5 and the flotation cleaning machine 1. The exhaust and vacuum breaking pipe 503 ensures that the pressure inside the heavy slag pipeline 5 is consistent with the external pressure. When the second switch valve 502 opens, the heavy slag pipeline 5 will not be impacted by the air pressure and will not vibrate, thus solving the vibration and noise problem of the flotation cleaning machine 1 when discharging heavy slag.

[0024] In some embodiments, the exhaust vacuum breaking pipe 503 is vertically arranged, and the height of the exhaust vacuum breaking pipe 503 exceeds the height of the flotation cleaning machine 1, so as to prevent slurry from spraying out from the top of the exhaust vacuum breaking pipe 503 when discharging heavy slag.

[0025] In some embodiments, the exhaust vacuum breaking pipe 503 is made of stainless steel, and the pipe diameter of the exhaust vacuum breaking pipe 503 is DN25-DN40.

[0026] In this embodiment, the diameter of the exhaust vacuum breaking pipe 503 is DN32.

[0027] In some implementations, a check valve 504 and a ball valve 505 are installed on the exhaust vacuum breaking pipe 503. The check valve 504 can prevent the slurry from spraying out from the top of the exhaust vacuum breaking pipe 503 when the pressure inside the pipe is too high.

[0028] The top wall of the flotation cleaning machine 1 is provided with a light slag outlet 104. The light slag outlet 104 is connected to the impurity separator 8 through the light slag pipe 7. The light slag in the flotation cleaning machine 1 flows out through the light slag outlet 104 and flows into the impurity separator 8 through the light slag pipe 7. A flow transmitter 9 is provided on the light slag pipe 7, and the flow rate in the light slag pipe 7 can be monitored through the flow transmitter 9.

[0029] It should be noted that the specific embodiments described in this utility model are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A pipeline structure for a flotation cleaning machine, comprising a flotation cleaning machine (1), characterized in that, A slurry inlet (101) is provided on the side wall of the flotation cleaning machine (1), and the slurry inlet (101) is connected to the slurry pump (2) through the slurry inlet pipe (3); a light slag outlet (104) is provided on the top wall of the flotation cleaning machine (1), and the light slag outlet (104) is connected to the impurity separator (8) through the light slag pipe (7); a slurry outlet (102) and a heavy slag outlet (103) are provided on the bottom wall of the flotation cleaning machine (1), and the slurry outlet (102) is connected to the pulper (10) through the slurry outlet pipe (4); the heavy slag outlet (103) is connected to the pulper slag well (6) through the heavy slag pipe (5); a first switch valve (501), a second switch valve (502) and an exhaust vacuum breaking pipe (503) are sequentially provided on the heavy slag pipe (5) along the heavy slag flow direction.

2. The pipeline structure of a flotation cleaning machine according to claim 1, characterized in that, The exhaust vacuum breaking pipe (503) is set vertically, and the height of the exhaust vacuum breaking pipe (503) exceeds the height of the flotation cleaning machine (1).

3. The pipeline structure of a flotation cleaning machine according to claim 2, characterized in that, The exhaust vacuum breaking pipe (503) is equipped with a check valve (504) and a ball valve (505).

4. The pipeline structure of a flotation cleaning machine according to claim 1, characterized in that, The exhaust vacuum breaking pipe (503) is made of stainless steel.

5. The pipeline structure of a flotation cleaning machine according to claim 1, characterized in that, The diameter of the exhaust vacuum breaking pipe (503) is DN25-DN40.

6. The pipeline structure of a flotation cleaning machine according to claim 1, characterized in that, A first pressure transmitter (301) is installed on the slurry inlet pipe (3).

7. The pipeline structure of a flotation cleaning machine according to claim 1, characterized in that, The slurry outlet pipe (4) is equipped with a second pressure transmitter (401) and a pressure regulating valve (402).

8. The pipeline structure of a flotation cleaning machine according to claim 1, characterized in that, A flow transmitter (9) is installed on the light slag pipeline (7).

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