CN214680228U - Reciprocating motion inserted bar device and sewage purification system - Google Patents

Abstract

The utility model relates to a reciprocating motion inserted bar device and sewage purification system, include: the bottom of the grit chamber is provided with a sand discharge port; the controller is arranged outside the grit chamber; the driving assembly is fixed on the inner wall of the grit chamber through a mounting frame and is electrically connected with the controller, and the driving assembly can output clockwise and anticlockwise bidirectional power; and the dredging executing piece is in driving connection with the driving assembly and comprises a first dredging arm and a second dredging arm, and the first dredging arm and the second dredging arm can be alternately inserted into or withdrawn from the sand discharge port. Along with the continuous operation of first mediation arm and second mediation arm, silt particle just is difficult to pile up and blocks up the sand discharge opening, guarantees to subside silt particle and can normally reliably follow the sand discharge opening and drain away, guarantees that sand-water separation work normally goes on, and the water purification plant normally operates.

Description

Reciprocating motion inserted bar device and sewage purification system

Technical Field

The utility model relates to a sewage purification treatment technical field especially relates to a reciprocating motion inserted bar device and sewage purification system.

Background

Water purification plants are currently used for the purification of domestic or production sewage, so that clean tap water is recycled to people. The sewage is inevitably mixed with the silt in the processes of migration, flowing and gathering. And if the silt in the sewage is not removed by settlement separation in advance, the operation of subsequent treatment equipment can be influenced, and the most important influences are machine pump abrasion, pipe network blockage, interference and even destruction of biochemical treatment process and the like. Generally, the grit chamber is mainly used for removing sand grains with the grain size of more than 0.2mm and the density of more than 2.65 t/cubic meter in sewage so as to protect pipelines, valves and other facilities from abrasion and blockage. The working principle is that on the basis of gravity separation, inorganic particles with large specific gravity can automatically sink and organic suspended particles can flow away along with water flow by controlling the inflow velocity of the grit chamber.

However, for most water purification plants at present, sand settling is generally carried out by using a sand-water separator circulation system with a grit chamber, and the sand is sucked every hour for 15 minutes. But the problems of sand discharge pipeline blockage easily occur due to the influences of factors such as insufficient suction, small pipeline diameter, large sand water treatment capacity and the like, so that sand-water separation work cannot be normally and effectively carried out, and the normal production operation of a water purification plant is seriously influenced.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a reciprocating motion inserted bar device and sewage purification system, aim at solving prior art silt particle and blockking up the sand discharge mouth, the problem that the sand-water separation work can't normally go on.

In one aspect, the present application provides a reciprocating plunger device, comprising:

the bottom of the grit chamber is provided with a sand discharge port;

the controller is arranged outside the grit chamber;

the driving assembly is fixed on the inner wall of the grit chamber through a mounting frame and is electrically connected with the controller, and the driving assembly can output clockwise and anticlockwise bidirectional power; and

the dredging executing part is in driving connection with the driving assembly and comprises a first dredging arm and a second dredging arm, and the first dredging arm and the second dredging arm can be alternately inserted into or withdrawn from the sand discharge port.

When the sewage purification system works, sewage continuously flows into the grit chamber, silt mixed in the sewage automatically settles under the action of self weight, and finally the silt is discharged from the grit discharge port. If the sewage flow in certain time periods is large, or the silt particles in the sewage are large and the viscosity is large, the silt is easy to cause untimely draining, and the silt is accumulated at the silt draining port to block the silt draining port.

The controller controls the driving assembly to start to act, the driving assembly can periodically and alternately output clockwise rotation power and anticlockwise rotation power, and the dredging executive component is in driving connection with the driving assembly, so that the first dredging arm and the second dredging arm can be alternately inserted into or withdrawn from the sand discharge port; in a similar way, when the driving assembly outputs anticlockwise rotating power, the first dredging arm exits from the sand discharge port and the second dredging arm is inserted into the sand discharge port, and the second dredging arm can continue to play a role in loosening and dredging the mud and sand blocked at the sand discharge port. So far, along with the continuous operation of first mediation arm and second mediation arm, silt particle just is difficult to pile up and blocks up the sand discharge opening, guarantees to subside silt particle and can normally reliably follow the sand discharge opening and drain away, guarantees that sand-water separation work normally goes on, water purification plant normal operating.

In one embodiment, the driving assembly comprises a motor, a speed reducer, a coupling and a driving wheel, the motor is fixed on the mounting frame, the speed reducer is connected with the motor, the speed reducer is connected with the coupling, and the driving wheel is connected with the coupling; the first dredging arm and the second dredging arm are arranged on the wheel rim of the driving wheel in an opposite manner at intervals.

In one embodiment, the dredge actuating member further comprises a mounting body, the mounting body is wound outside the driving wheel, the first dredge arm is connected with the first end of the mounting body, and the second dredge arm is connected with the second end of the mounting body.

In one embodiment, the inner side surface of the mounting body facing the driving wheel is provided with an abrasion increasing layer, and the abrasion increasing layer is pressed with the wheel surface of the driving wheel.

In one embodiment, the inner side surface of the mounting body facing the driving wheel is provided with a first tooth structure, and the wheel surface of the driving wheel is provided with a second tooth structure, wherein the first tooth structure is meshed with the second tooth structure.

In one embodiment, the ends of the first dredging arm and the second dredging arm close to the sand discharge opening are formed into a pointed cone-shaped structure.

In one embodiment, the sand basin further comprises a first supporting guide frame and a second supporting guide frame, the first supporting guide frame and the second supporting guide frame are respectively arranged on the inner wall of the sand basin, each of the first supporting guide frame and the second supporting guide frame comprises a supporting rod, a supporting sliding ring and a rolling body, the supporting sliding ring is arranged at the end of the supporting rod, the rolling body is rotatably arranged in a rolling groove preset on the inner annular wall of the supporting sliding ring, and the first dredging arm and the second dredging arm are arranged in an inner annular cavity of the supporting sliding ring in a penetrating mode and are in rolling contact with the rolling body.

In one embodiment, the reciprocating motion inserted bar device further comprises a vibration motor and a vibrating rod, the vibration motor is arranged at the end parts of the first dredging arm and the second dredging arm, the vibrating rod is in driving connection with the vibration motor, and the vibrating rod can be inserted into or withdrawn from the sand discharge port.

In one embodiment, the reciprocating rod-inserting device further comprises a rotating cylinder and a rotating screw, the rotating cylinder is arranged at the end parts of the first dredging arm and the second dredging arm, the rotating screw is in driving connection with the rotating cylinder, and the rotating screw can be inserted into or withdrawn from the sand outlet.

In addition, the present application also provides a sewage purification system comprising the reciprocating plunger device as described above.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of a reciprocating rod-inserting device according to an embodiment of the present invention.

Description of reference numerals:

10. a grit chamber; 11. a sand discharge port; 12. a sewage inlet; 13. a water outlet; 20. a drive assembly; 30. dredging an actuating member; 31. a first dredging arm; 32. a second dredging arm; 33. mounting the main body; 40. a first support guide; 50. a second support guide; 51. a support bar; 52. a supporting slip ring; 53. a rolling body; 60. a rotating cylinder; 70. rotating the screw; 80. a sand discharge pipe; 90. a sand pump.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

The embodiment of the application provides a sewage purification system, for example, a complete set of equipment for realizing sewage purification treatment in a water purification plant. The sewage purification system may operate by a biological purification method, a physical purification method, or a chemical purification scheme according to actual needs, and is not particularly limited herein.

The sewage is inevitably mixed into the silt in the processes of migration, flowing and gathering. If the silt in the sewage is not removed by sedimentation separation in advance, the operation of subsequent treatment equipment is influenced, for example, the machine pump is seriously abraded and even scrapped due to the large-particle silt; or the silt can cause the blockage of a pipe network; or the silt can interfere with and even destroy the biochemical treatment process. Based on this, can set up reciprocating motion inserted bar device among the sewage purification system for realize getting rid of the silt particle separation in the sewage, in order to avoid above-mentioned problem to take place.

As shown in fig. 1, a reciprocating plunger device is shown for one embodiment of the present application, which includes: a grit chamber 10, a controller, a drive assembly 20 and a dredging implement 30. The grit chamber 10 is constructed as a brick-and-concrete structure, and is usually buried under the ground to avoid occupying ground space. The grit chamber 10 is used as a front-stage process of the purification process and is used for carrying out sand-water separation on the sewage so as to remove silt particles in the sewage. For example, the grit chamber 10 in this embodiment has a tapered cylindrical structure.

Referring to fig. 1, a sewage inlet 12 is formed in a side wall of the grit chamber 10, a water outlet 13 is formed in the side wall of the grit chamber 10, and a sand outlet 11 is formed in the bottom of the grit chamber 10. The axis of the sewage inlet 12 and the axis of the grit chamber 10 are staggered, so that the sand-water mixed medium flows along a circular path in the grit chamber 10. Through so setting up, can make the sand and water mixed medium (being sewage) that flows into grit chamber 10 flow longer route in grit chamber 10, make the silt particle have enough long time to carry out more abundant settlement, help the silt particle clean separation in the sewage.

With reference to fig. 1, the water outlet 13 and the sewage inlet 12 are distributed in a circumferential direction, and the water outlet 13 is located downstream of the sewage inlet 12 along the flowing direction of the sewage in the grit chamber 10. Therefore, after the sewage circularly flows for a circle in the grit chamber 10, the slightly clean sewage after the silt is removed by sedimentation can be quickly discharged from the water outlet 13 downstream, so that the impact and interference caused by the extrusion of the space of the grit chamber 10 to the subsequent silt mixed medium newly flowing into the grit chamber 10 are avoided, and the sewage treatment capacity is improved.

Further, a filter screen is installed at the water outlet 13. The filter screen can separate the complete residual silt particle of non-sand setting separation in the sewage to avoid flowing out grit chamber 10, cause wearing and tearing to the pump, cause the jam to the pipe network. It will be appreciated that the screen is a mesh sheet having a plurality of mesh openings arranged in an array. According to actual needs, one filter screen can be arranged, or two or more filter screens can be arranged in sequence in a stacked mode along the water flow direction.

In addition, in order to further accelerate the discharge of the silt from the sand discharge port 11, the sand discharge port 11 is further connected with a sand discharge pipe 80, and the sand discharge pipe 80 is connected with a sand pump 90. The sand pump 90 can generate suction force in the sand discharge pipe 80 during operation, so that the sand is accelerated to pass through the sand discharge port 11, and the probability of blockage is reduced.

The controller is disposed outside the grit chamber 10. For example, the controller may be a PLC, a numerical control system, a micro-controller computer, or the like.

With reference to fig. 1, the driving assembly 20 is fixed on the inner wall of the grit chamber 10 through a mounting bracket and electrically connected to the controller, and the driving assembly 20 can output clockwise and counterclockwise bidirectional power; the dredging implement 30 is in driving connection with the driving assembly 20, and the dredging implement 30 comprises a first dredging arm 31 and a second dredging arm 32, and the first dredging arm 31 and the second dredging arm 32 can be alternately inserted into or withdrawn from the sand outlet 11.

When the sewage purification system works, sewage continuously flows into the grit chamber 10, silt mixed in the sewage automatically settles under the action of self weight, and finally is discharged out of the grit chamber 10 from the sand discharge port 11. If the sewage flow in certain time periods is large, or the silt particles in the sewage are large and the viscosity is large, the silt is easy to be discharged out of time, and the silt is accumulated on the silt discharge port 11 to block the silt discharge port 11.

At this moment, the controller controls the driving assembly 20 to start to act, the driving assembly 20 can periodically and alternately output clockwise rotation power and anticlockwise rotation power, and the dredging actuating member 30 is in driving connection with the driving assembly 20, so that the first dredging arm 31 and the second dredging arm 32 can be alternately inserted into or withdrawn from the sand discharge port 11, that is, when the driving assembly 20 outputs clockwise rotation power, the first dredging arm 31 is inserted into the sand discharge port 11, and the second dredging arm 32 is withdrawn from the sand discharge port 11, at this moment, the first dredging arm 31 plays a role in loosening and dredging the sand blocked at the sand discharge port 11; similarly, when the driving assembly 20 outputs the counterclockwise rotating power, the first dredging arm 31 exits from the sand outlet 11 and the second dredging arm 32 is inserted into the sand outlet 11, at this time, the second dredging arm 32 can continue to loosen and dredge the mud and sand blocked at the sand outlet 11. So far, along with the continuous operation of first mediation arm 31 and second mediation arm 32, silt particle just is difficult to pile up and blocks up sand outlet 11, guarantees to subside silt particle and can normally reliably follow sand outlet 11 and drain away, guarantees that sand-water separation work normally goes on, and the water purification plant normally operates.

In some embodiments, the driving assembly 20 includes a motor fixed to the mounting frame, a speed reducer connected to the motor, a coupling connected to the speed reducer, and a driving wheel connected to the coupling; the first dredging arm 31 and the second dredging arm 32 are arranged on the rim of the driving wheel in a spaced and opposite mode. When the sand discharge port 11 needs to be dredged and blocked, the motor is started to output rotary power, the speed reducer reduces the speed of the power output by the motor and increases torque at the same time, the coupling further transmits the rotary power to the driving wheel, the driving wheel rotates clockwise first, and the first dredging arm 31 is driven to be inserted into the sand discharge port 11 to dredge silt; then the driving wheel rotates anticlockwise, the first dredging arm 31 withdraws from and the second dredging arm 32 is inserted into the sand outlet 11 in a seamless connection mode, and the effect of loosening and preventing accumulation and blockage on the silt in the sand outlet 11 is always kept.

With continued reference to fig. 1, further, the dredging actuator 30 further includes a mounting body 33, the mounting body 33 is wound around the driving wheel, the first dredging arm 31 is connected to a first end of the mounting body 33, and the second dredging arm 32 is connected to a second end of the mounting body 33. Because the outline of drive wheel is arc, and installation main part 33 can this arc of adaptation and the wheel face outside of wrapping up the equipment to the drive wheel, can make first mediation arm 31 and second mediation arm 32 all just to arrange sand mouth 11 to when the drive wheel rotates, first mediation arm 31 and second mediation arm 32 can be taken out with the linear trajectory motion and insert row sand mouth 11, improve the mediation efficiency, guarantee first mediation arm 31 and second mediation arm 32 and take out the degree of accuracy of inserting row sand mouth 11.

Alternatively, the mounting body 33 may be a semi-closed ring body made of metal, hard plastic, etc., and the inner ring profile of the semi-closed ring body is adapted to the outer profile of the driving wheel.

It will be appreciated that the drive wheel of the above embodiment frictionally rotates the mounting body 33 to move the first and second dredge arms 31, 32. In order to avoid the effect of dredging caused by the slip of the mounting body 33 on the driving wheel due to the resistance and reaction force of the mud and sand during the insertion and extraction of the mud and sand, further, an abrasion increasing layer is arranged on the inner side surface of the mounting body 33 facing the driving wheel, and the abrasion increasing layer is tightly pressed with the wheel surface of the driving wheel. The friction force between the mounting body 33 and the driving wheel can be increased by the wear-increasing layer, so that slipping is prevented, and the dredging capability of the first dredging arm 31 and the second dredging arm 32 on mud and sand at the sand outlet 11 is enhanced.

Alternatively, as an alternative to the above embodiment, the inner side surface of the mounting body 33 facing the driving wheel is provided with a first tooth structure, and the wheel surface of the driving wheel is provided with a second tooth structure, and the first tooth structure is engaged with the second tooth structure. Adopt first tooth structure and second tooth structure meshing, also can guarantee that installation main part 33 reliably follows the synchronous syntropy rotation of drive wheel, take out the socket sand discharge mouth 11 from effectively driving first mediation arm 31 and second mediation arm 32 rotation, prevent that the jam problem from taking place.

Preferably, the ends of the first dredging arm 31 and the second dredging arm 32 close to the sand discharge opening 11 are formed into a pointed cone structure. The silt is generally solid particles with larger particle size, such as small stone particles, and has certain hardness, and the hardness is further improved after the silt is agglomerated. And make the tip design of first mediation arm 31 and second mediation arm 32 for the taper shape, can insert more easily and pile up in the silt particle of jam, and along with the increase of the depth of insertion, the diameter grow first mediation arm 31 and second mediation arm 32 can produce crowded push effect to the silt particle, make and produce the alternate dislocation between the silt particle, break the power balanced state that blocks up the silt heap, make the silt particle can follow rivers and pass row's sand mouth 11, reach the mediation effect.

With reference to fig. 1, on the basis of any of the above embodiments, the sand basin further includes a first supporting guide 40 and a second supporting guide 50, the first supporting guide 40 and the second supporting guide 50 are respectively disposed on the inner wall of the sand basin 10, the first supporting guide 40 and the second supporting guide 50 each include a supporting rod 51, a supporting slip ring 52 and a rolling body 53, the supporting slip ring 52 is disposed at an end of the supporting rod 51, the rolling body 53 is rotatably disposed in a rolling groove preset on an inner annular wall of the supporting slip ring 52, and the first dredging arm 31 and the second dredging arm 32 are both inserted into an inner annular cavity of the supporting slip ring 52 and are in rolling contact with the rolling body 53.

The first support guide 40 and the second support guide 50 can respectively play a role in guiding and supporting the first dredging arm 31 and the second dredging arm 32, and are helpful for increasing the rigidity of the first dredging arm 31 and the second dredging arm 32, so that mud and sand can be dredged more reliably. The rolling bodies 53 pre-installed on the inner ring wall of the supporting slide ring 52 can reduce the frictional resistance to the first dredging arm 31 and the second dredging arm 32, thereby reducing the load loss of the motor.

Further, on the basis of any one of the above embodiments, the reciprocating motion inserted bar device further comprises a vibration motor and a vibrating rod, wherein the vibration motor is arranged at the end parts of the first dredging arm 31 and the second dredging arm 32, the vibrating rod is in driving connection with the vibration motor, and the vibrating rod can be inserted into or withdrawn from the sand discharge port 11. After first dredging arm 31 or second dredging arm 32 insert sand discharge port 11, vibrating motor synchronous drive vibrating rod produces the vibration, and vibrating rod plays the loose effect of vibrating to the silt particle that gets into through sand discharge port 11 to further prevent that the silt particle from piling up the jam, guarantee that the sand-water separation is reliably gone on.

With continued reference to fig. 1, or as an alternative to the above embodiment, the reciprocating rod-inserting apparatus further includes a rotary cylinder 60 and a rotary screw 70, the rotary cylinder 60 is disposed at the end of the first dredging arm 31 and the second dredging arm 32, the rotary screw 70 is in driving connection with the rotary cylinder 60, and the rotary screw 70 can be inserted into or withdrawn from the sand outlet 11. After the first dredging arm 31 or the second dredging arm 32 is inserted into the sand discharge port 11, the rotary cylinder 60 drives the rotary screw 70 to rotate, and the rotary screw 70 also plays roles of spiral loosening and pushing for the silt particles flowing through the sand discharge port 11, so that the silt particles are accelerated to pass through the sand discharge port 11, and meanwhile, certain crushing effect is played for the silt particles, and the blockage problem is prevented fundamentally.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A reciprocating plunger apparatus, comprising:

the bottom of the grit chamber is provided with a sand discharge port;

the controller is arranged outside the grit chamber;

the driving assembly is fixed on the inner wall of the grit chamber through a mounting frame and is electrically connected with the controller, and the driving assembly can output clockwise and anticlockwise bidirectional power; and

the dredging executing piece is in driving connection with the driving assembly and comprises a first dredging arm and a second dredging arm, and the first dredging arm and the second dredging arm can be alternately inserted into or withdrawn from the sand discharge port; the dredging executive component further comprises an installation main body, the installation main body is wound outside the driving wheel, the first dredging arm is connected with the first end of the installation main body, and the second dredging arm is connected with the second end of the installation main body.

2. The reciprocating slotting rod device of claim 1, wherein the driving assembly comprises a motor, a reducer, a coupler and a driving wheel, the motor is fixed on the mounting frame, the reducer is connected with the motor, the reducer is connected with the coupler, and the driving wheel is connected with the coupler; the first dredging arm and the second dredging arm are arranged on the wheel rim of the driving wheel in an opposite manner at intervals.

3. The reciprocating motion plunger apparatus of claim 2, wherein the mounting body is a semi-closed ring body made of metal or hard plastic, and the inner ring contour of the semi-closed ring body is adapted to the outer contour of the driving wheel.

4. The reciprocating ram apparatus of claim 3, wherein the inner side surface of the mounting body facing the drive wheel is provided with an abrasion increasing layer, and the abrasion increasing layer is pressed against the wheel surface of the drive wheel.

5. The reciprocating slotting rod device according to claim 3, wherein the inner side surface of the mounting body facing the driving wheel is provided with a first tooth structure, the wheel surface of the driving wheel is provided with a second tooth structure, and the first tooth structure is engaged with the second tooth structure.

6. The reciprocating motion bayonet apparatus of claim 1, wherein the ends of the first and second break-off arms proximate the discharge port are formed as a pointed cone-like structure.

7. The reciprocating plunger device of any one of claims 1 to 6, further comprising a first supporting guide and a second supporting guide, wherein the first supporting guide and the second supporting guide are respectively disposed on the inner wall of the grit chamber, and each of the first supporting guide and the second supporting guide comprises a supporting rod, a supporting slip ring and a rolling body, the supporting slip ring is disposed at the end of the supporting rod, the rolling body is rotatably disposed in a rolling groove preset on the inner annular wall of the supporting slip ring, and the first dredging arm and the second dredging arm are both inserted into the inner annular cavity of the supporting slip ring and are in rolling contact with the rolling body.

8. The reciprocating plunger apparatus of any one of claims 1 to 6, further comprising a vibration motor and a vibrating rod, wherein the vibration motor is disposed at the end of the first dredging arm and the second dredging arm, the vibrating rod is in driving connection with the vibration motor, and the vibrating rod can be inserted into or withdrawn from the sand discharge port.

9. The reciprocating motion plunger apparatus of any one of claims 1 to 6, further comprising a rotary cylinder and a rotary screw, wherein the rotary cylinder is disposed at the end of the first dredge arm and the second dredge arm, the rotary screw is in driving connection with the rotary cylinder, and the rotary screw can be inserted into or withdrawn from the sand discharge port.

10. A sewage purification system comprising a reciprocating plunger assembly according to any one of claims 1 to 9.

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