Method and system for collecting steel rail milling and grinding dust

Abstract

The invention discloses a steel rail milling dust collection method and system, and the system comprises a high-pressure fan which is installed at the top of a dust filtering box, and an air inlet of the high-pressure fan is communicated with an upper box body of the dust filtering box through a fan air inlet pipe; the membrane filter element is mounted in the dust filter box; the metal rotating wing is mounted in the film-covered filter element and is used for removing particles adsorbed on the surface of the film-covered filter element; the milling and grinding dust collecting port is used for collecting dust formed after the steel rail is milled and ground, and is communicated with the lower box body of the dust filtering box through a pipeline; the dust storage box is connected to the lower portion of the dust filtering box through a communicating box, the milling dust collecting opening is in a cuboid shape, a dust inlet is formed in the front end of the milling dust collecting opening, and the upper surface of the milling dust collecting opening extends in an inclined mode and gradually rises backwards from the dust inlet. According to the steel rail milling and grinding dust collecting method and system, high-temperature, large-particle and high-viscosity dust generated after grinding can be efficiently collected.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of dust collection equipment, and particularly relates to a rail milling dust collection method and system suitable for collecting the milling dust after rail milling. BACKGROUND

[0002] Rail is one of the infrastructures of railway transportation, which bears the weight and load of trains. After the railway line is put into actual operation, the frequent impact of wheel load on the rail will cause different degrees of wear and deformation of the rail. When the wear reaches a certain degree, the poor geometric matching of wheel and rail will not only cause the effect of poor power action and shorten the service life of the rail, but also endanger the safety of train operation. To solve this problem, the method of on-line rail milling is generally used at present to repair the damage of the rail surface and prolong the service life of the rail. The dust generated after rail milling not only contains metal particles, but also contains other impurities, and has the characteristics of high temperature, small particle size and good adhesion, and therefore must be collected and cleaned when discharged into the air.

[0003] A dust collection device is installed on the rail milling car to collect the high-temperature dust generated in the polishing operation through the air suction system. However, since the dust collection device of the milling itself is close to the polishing position, the dust temperature is very high just after polishing, and the high-temperature resistance of the filter is required; the large metal particles with high temperature are easily adhered to the track, and the wind power cannot effectively collect them; and due to the limitation of the space itself, the suction force of the polishing device of the polishing car is not enough to completely collect the dust generated by polishing, and the missed dust can only be cleaned by manual work in the later stage. Manual cleaning has high working intensity, poor working environment and low efficiency.

[0004] The existing rail milling dust collection system has low collection rate and large emission pollution, and therefore an urgent need exists for a dust collection system which can efficiently collect the dust with high temperature, large particle size and high viscosity after polishing and discharge to reach PM2.5 to solve the problem of dust collection after rail polishing. SUMMARY

[0005] Based on the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a rail milling dust collection method and system which can efficiently collect the dust with high temperature, large particle size and high viscosity generated after polishing, and the filtered gas standard reaches PM2.5.

[0006] To solve the above technical problems, the present application realizes the following technical scheme:

[0007] The present application provides a kind of steel rail milling dust collection method, comprising the following steps: high pressure fan works, negative pressure is formed in dust filter box by fan inlet pipe, dust formed after steel rail milling is collected by dust conveying hard pipe, dust conveying corrugated pipe and milling dust collection port, dust is sucked into dust filter box using the flow rate formed by pipe, most of the dust falls due to the decrease of flow rate after entering large space, and is accumulated into dust storage box through communication box, air containing a small amount of small dust is filtered through membrane filter element located in dust filter box, and is discharged into the air along fan inlet pipe through high pressure fan, wherein the milling dust collection port is flat cuboid, the front end has dust inlet, and the upper surface extends obliquely, and gradually rises from the dust inlet backward; a part of substandard particles are adsorbed on the surface of membrane filter element, high pressure air enters the spray hole pipe of metal rotating wing located in membrane filter element through electromagnetic valve control, the spray hole pipe rotates naturally under high pressure airflow, and its operation is controlled using pulse stroke, the spray hole pipe sprays airflow using its spray hole under stroke, the boom rotates under stroke, and the particles adsorbed on the surface of membrane filter element are removed using back-blowing airflow, the airflow with a certain flow rate is instantaneously ejected to the surface of membrane filter element, and the falling dust falls into dust storage box through communication box.

[0008] As described above, negative pressure is formed in dust filter box by high pressure fan, dust in the polishing process enters dust filter box through dust conveying corrugated pipe, large particle dust is settled in dust storage box by gravity dust removal, air containing a small amount of small dust is filtered through membrane filter element, and clean air after filtration is discharged to the atmosphere through fan outlet pipe of high pressure fan. Membrane filter element is automatically cleaned using reverse airflow of metal rotating wing, the cleaned dust falls into dust storage box, and the polishing area is not polluted by dust. The steel rail milling dust collection method of the present application can collect more than 99% of the dust through the negative pressure formed in dust filter box by high pressure fan, the high-precision membrane filter element in dust filter box has a filtration efficiency of 99.99% for particles of 2.5 microns and above, the purity of discharged air reaches PM2.5 or above, and the continuous collection capacity of dust collection system can be improved by back-blowing of metal rotating wing.

[0009] The application provides a rail milling dust collecting system, which comprises a high-pressure fan installed on the top of a dust filtering box, an air inlet of the high-pressure fan being communicated with an upper box body of the dust filtering box through a fan air inlet pipe, a membrane filter element installed in the dust filtering box, a metal rotating wing installed in the membrane filter element for removing particles adsorbed on the surface of the membrane filter element, a milling dust collecting port for collecting dust generated after rail milling, the milling dust collecting port being communicated with a lower box body of the dust filtering box through a pipeline, and a dust storage box connected to the lower part of the dust filtering box through a communication box, the milling dust collecting port being in the shape of a flat cuboid, having a dust inlet at the front end, and having an upper surface extending in an inclined manner and gradually rising from the dust inlet to the rear.

[0010] According to the above, the rail milling dust collecting system of the application adopts the membrane filter element of high-density non-woven fabric, realizes high-purity air discharge, and combines the metal rotating wing to automatically clean the membrane filter element at a fixed time, so as to maintain the filtering capacity of the membrane filter element, prolong the service life, and effectively improve the continuity of the milling operation.

[0011] Since the upper surface of the milling dust collecting port is inclined and gradually rises away from the dust inlet, the height of the dust inlet can be small, the dust inlet can be as close to the milling position as possible, dust can be effectively collected, and dust suction capacity can be ensured.

[0012] Optionally, the metal rotating wing comprises an air inlet pipe fixed to the top of the dust filtering box through a triangular support frame, a hanger rod rotatably connected to one end of the air inlet pipe extending into the membrane filter element through an upper bearing sleeve, two jet pipe tubes communicated with the hanger rod and respectively located on both sides of the hanger rod, and a lower bearing sleeve connected between the bottom of the hanger rod and the jet pipe tube.

[0013] According to the above, the metal rotating wing with the specific structure is adopted, gas enters the jet pipe tube through the air inlet pipe, the gas flow blows outward from the inside of the membrane filter element, the gas flow impacts on the membrane filter element, dust on the surface of the filter element is blown away, dust recovery is completed, the effect of cleaning the filter element is achieved by using the jet flow to impact the membrane filter element, the cleaning efficiency is improved, and the filter element is not damaged. The metal rotating wing in the membrane filter element is used to clean the membrane filter element, the overall filtering effect of the equipment is ensured, the rotating wing has the effect of gas flow pulse, the pulse gas flow makes the rotating wing rotate and blow to prevent powder dust from blocking the micropores of the filter element, the gas flow is instantaneously jetted to the filtering material of the membrane filter element through the jet pipe tube, dust is shaken off, dust adhered to the filter element is fallen, and the normal use effect of the equipment can be ensured.

[0014] Further, a lifting disc for covering the opening at the top of the membrane filter element is installed on the air inlet pipe through a spring.

[0015] From the above, the lifting disc can seal the top of the membrane filter element, help the airflow flow inside the membrane filter element, and clean the filter element more efficiently.

[0016] Optionally, an electromagnetic valve is fixed outside the upper box body of the dust filtering box, for controlling the high-pressure air to enter the boom through the air inlet pipe, and the spray hole pipe is naturally rotated under the high-pressure airflow, and the airflow sprayed from the spray holes of the spray hole pipe hits and removes the particles adsorbed on the surface of the membrane filter element.

[0017] From the above, the electromagnetic valve is started, the high-pressure air enters the spray hole pipe through the electromagnetic valve, and the airflow blows the dust attached to the filter element and collects it in the dust storage box, thereby ensuring the normal use of the membrane filter element and achieving stable dust removal effect.

[0018] Optionally, the front end of the upper surface is located at the middle part of the upper and lower direction of the two side wall surfaces of the milling dust collection port.

[0019] With the above structure, the positions of the two side wall surfaces above the upper surface can be well aligned, for example, with the sand belt, to the milling dust collection port, so that the dust can be efficiently collected. Further, the dust conveying bellow is connected with a dust conveying hard pipe at one end away from the milling dust collection port, and the other end of the dust conveying hard pipe is fixed to the lower box body of the dust filtering box.

[0020] From the above, the flexibility of the dust conveying bellow is good, which can adapt to the displacement variation requirement of the switching between the suspension position and the working position of the polishing device, and to a certain extent, the filtering path of the high-temperature dust is extended, which is convenient for cooling. The dust conveying bellow and the dust conveying hard pipe can extend the path of the dust-containing gas entering the dust filtering box, so that the cooling of the dust-containing gas is more sufficient, and the risk of fire caused by high temperature in the dust collection system is reduced.

[0021] Optionally, the milling dust collection port is made of copper material.

[0022] From the above, the milling dust collection port is made of copper material with good heat conduction performance, which can avoid the cooling and bonding of high-temperature dust, and solve the problem of cooling and bonding of high-temperature dust with iron or steel collection tongue.

[0023] Optionally, the lower box body of the dust filtering box is fixed with a pressure sensor.

[0024] Optionally, the communication box extends in the up and down direction, and its diameter is smaller than that of the dust filtering box and the dust storage box.

[0025] With the above structure, the dust storage box can have a larger capacity, and the dust can easily enter the dust storage box, while the dust is inhibited from being rolled up by negative pressure and scattered, so that the dust can be stably collected.

[0026] The above description is only a summary of the technical scheme of the present application, in order to make the technical means of the present application more clearly understood, and can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will be described in detail in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings of the embodiments will be briefly introduced as follows.

[0028] Figure 1 It is a front oblique view of the rail milling and grinding dust collecting system of the present application;

[0029] Figure 2 It is a rear oblique view of the rail milling and grinding dust collecting system of the present application;

[0030] Figure 3 It is a front view of the rail milling and grinding dust collecting system of the present application;

[0031] Figure 4 It is a side view of the rail milling and grinding dust collecting system of the present application;

[0032] Figure 5 It is a structural schematic view of the milling and grinding dust collecting port of the present application.

[0033] Among them, 10-high pressure fan, 11-dust storage box, 12-dust conveying corrugated pipe, 13-milling dust collecting port, 14-communication box, 20-fan air inlet pipe, 30-fan air outlet pipe, 40-metal rotating wing, 50-solenoid valve, 60-coated filter element, 70-dust filtering box, 80-pressure sensor, 90-dust conveying hard pipe. DETAILED DESCRIPTION

[0034] The specific embodiments of the present application will be described in detail below in combination with the drawings, which are part of the present specification, and the principles of the present application are illustrated by the embodiments, and other aspects, features and advantages of the present application will become apparent through the detailed description. In the referred drawings, the same or similar components in different drawings are denoted by the same reference numerals.

[0035] As Figures 1 to 5As shown, the rail milling dust collecting system of the present application mainly comprises a high-pressure fan 10, a metal rotating wing 40, a membrane filter element 60, a dust storage box 11, a dust conveying corrugated pipe 12 and a milling dust collecting port 13. The high-pressure fan 10 is fixed on the top of a dust filtering box 70, one end of a fan air inlet pipe 20 is connected to the air inlet of the high-pressure fan 10, the other end of the fan air inlet pipe 20 is communicated to the upper box body of the dust filtering box 70, and one end of a fan air outlet pipe 30 is connected to the air outlet of the high-pressure fan 10. The membrane filter element 60 is installed inside the dust filtering box 70, the metal rotating wing 40 is fixed inside the box body of the dust filtering box 70 and inside the membrane filter element 60, and the lower part of the membrane filter element 60 is fixed to the bottom of the metal rotating wing 40. A communication box 14 connects the dust filtering box 70 and the dust storage box 11, and the dust storage box 11 is located below the lower box body of the dust filtering box 70. A dust conveying hard pipe 90 is fixed to the lower box body of the dust filtering box 70, one end of the dust conveying corrugated pipe 12 is connected to the dust conveying hard pipe 90, and the other end of the dust conveying corrugated pipe 12 is connected to the milling dust collecting port 13, through which the dust generated after the rail milling is collected.

[0036] The rail milling dust collecting system of the present application adopts the modular design of the dust storage box 11 and the dust filtering box 70, which are respectively fixed to the inside and bottom of the vehicle, to realize convenient and fast dust cleaning and maintenance.

[0037] In the present application, the metal rotating wing 40 comprises an air inlet pipe, a boom, a jet pipe, a triangular support, a lifting disc, an upper bearing sleeve, a lower bearing sleeve and a fastener. The triangular support frame is fixed on the cover plate at the top of the membrane filter element 60, the top end of the air inlet pipe penetrates through and is fixed at the top center of the triangular support frame, the bottom end of the air inlet pipe is rotatably connected to the upper end of the boom through the upper bearing sleeve and is in communication, the two jet pipes are in communication with the boom through the upper bearing sleeve, and the two jet pipes are arranged in parallel with the boom and oppositely on both sides of the boom. The two jet pipes are each provided with jet holes uniformly distributed along the length direction thereof. The distance between the two jet pipes and the boom supported by the upper and lower bearing sleeves of the metal rotating wing 40 matches the inner diameter size of the membrane filter element 60. The lower bearing sleeve is connected between the bottom of the boom and the jet pipe, and the fastener is installed on the boom from the bottom of the membrane filter element 60 to limit the boom at the bottom of the membrane filter element 60 and fix the membrane filter element 60. The lifting disc is installed on the air inlet pipe through a spring to tightly cover the opening at the top of the membrane filter element 60. The jet pipe of the metal rotating wing 40 naturally rotates under the high-pressure airflow, the operation thereof is controlled by using pulse strokes, and the jet pipe uses the airflow sprayed from the jet holes thereof to beat the membrane filter element 60 under the strokes, and the back-blowing airflow is used for powder recovery.

[0038] The electromagnetic valve 50 is fixed to the upper box body of the dust filtering box 70, and is used for controlling high-pressure air to enter the boom through the air inlet pipe.

[0039] The pressure sensor 80 is fixed to the lower box body of the dust filtering box 70, and is used for monitoring the gas pressure in the lower box body of the dust filtering box 70.

[0040] In the present application, the existing dust collecting device of the grinding machine is arranged close to the grinding position, and the temperature of the dust after grinding is very high, so that the high-temperature resistance of the filtering equipment is required. The length of the dust conveying bellows 12 is relatively long, and the dust conveying bellows 12 is not limited by the original structure position, and the path of the high-temperature dust is extended to a certain extent, so that the high-temperature dust is cooled in the dust conveying bellows 12. The dust conveying hard pipe 90 is connected to the end of the dust conveying bellows 12 away from the milling dust collecting port 13, and the other end of the dust conveying hard pipe 90 is fixed to the lower box body of the dust filtering box 70.

[0041] The large metal particles with high temperature are easily adhered to the track, and cannot be effectively collected by relying on the wind force only, so that the content of the dust in the air is high, and the working environment is relatively poor. The rail milling dust collecting system of the present application is based on the aerodynamic characteristics of the grinding dust, and the milling dust collecting port 13 is in a flat shape, and the opening cover is arranged at the position where the grinding sparks and grinding dust are generated. Compared with the traditional open structure, the collection efficiency can be effectively improved.

[0042] Specifically, as shown in Figure 5 The milling dust collecting port 13 is basically in a flat rectangular shape, and the front side (the side opposite to the connection position of the dust conveying bellows 12) is opened to form a dust inlet, and the dust enters the milling dust collecting port 13 from the dust inlet; different from the strict rectangular shape, the upper surface 131 of the milling dust collecting port 13 is a slope, and gradually rises away from the dust inlet; the front end of the upper surface 131 is located at the middle part of the upper and lower directions of the two side wall surfaces 132 of the milling dust collecting port 13, that is, the two side wall surfaces 132 have parts above the upper surface 131.

[0043] In use, the milling dust collecting port 13 is arranged above the rail and its front-rear direction is consistent with the extension direction (length direction) of the rail, and its dust inlet faces the dust (iron filings) scattered along the extension direction of the rail due to grinding by a grinding belt or the like. Since the milling dust collecting port 13 is formed in a flat cuboid shape, and its upper surface 131 is a slope gradually rising in the direction away from the dust inlet, the dust inlet height can be made small, and the dust inlet can be made as close to the grinding position as possible, so that the dust can be effectively collected and the dust suction capacity (suction amount) can be ensured.

[0044] In addition, since the front end of the upper surface 131 is located at the middle of the upper and lower directions of the two side wall surfaces 132 of the milling dust collecting port 13, the positions of the milling dust collecting port 13 can be well aligned, for example, with reference to the grinding belt, by the portions of the two side wall surfaces 132 above the upper surface 131, so that the dust can be efficiently collected.

[0045] The present application adopts a unique dust collecting port structure, and the collection efficiency can reach more than 99%. The milling dust collecting port 13 adopts copper material with good heat conduction performance, which can avoid high-temperature dust cooling and bonding. The rail milling dust collecting system of the present application adopts copper material with good heat conduction performance to design the milling dust collecting port 13 in a tongue-like structure, which solves the problem of easy cooling and bonding of iron or steel collecting tongues for high-temperature dust.

[0046] The rail milling dust collecting system of the present application can be installed away from the milling position. After the dust is generated, it is cooled and transported through the dust and debris conveying corrugated pipe 12 and the dust and debris conveying hard pipe 90. After the membrane filter element 60 is put into use, a small amount of dust will gradually adhere to the windward surface of the filter material of the membrane filter element 60 and be trapped between the filter element pleats, resulting in reduced air suction effect and dust removal efficiency. The metal rotating wing 40 lowers the lifting disc under the airflow when the pulse is opened, and the spring force makes the cover tightly cover the opening at the top of the membrane filter element 60. The airflow is uniformly blown to the leeward surface of the filter material through the spray holes of the spray hole pipes distributed on both sides. Through scientific and reasonable air pressure and airflow design, the filter material surface and the accumulated dust between the pleats can be effectively cleaned, achieving the effect of blowing dust.

[0047] The rail milling dust collecting method using the above-mentioned rail milling dust collecting system includes the following steps:

[0048] The high-pressure fan 10 works to form a negative pressure in the dust filtering box 70 through the fan air inlet pipe 20, to collect the dust generated after the rail milling through the dust conveying hard pipe 90, the dust conveying bellows 12 and the milling dust collecting port 13, to use the flow rate formed by the air in the pipe to suck the dust into the dust filtering box 70, and to use the flow rate to make most of the dust fall after entering the large space, to fall and accumulate into the dust storage box 11 through the dust channel formed by the communication box 14 extending in the up-down direction, to filter the air containing a small amount of dust through the membrane filter element 60 in the dust filtering box 70, and to discharge the air to the air through the high-pressure fan 10 along the fan air inlet pipe 20.

[0049] A part of the substandard particles are adsorbed on the surface of the membrane filter element 60, the high-pressure air is controlled to enter the jet pipe of the metal rotating wing 40 in the membrane filter element 60 through the electromagnetic valve 50, the jet pipe naturally rotates under the high-pressure air flow, the pulse stroke is used to control the operation, the jet pipe uses the air flow sprayed from the jet hole to beat the membrane filter element 60 under the stroke, the hanger rotates under the stroke, the particles adsorbed on the surface of the membrane filter element 60 are removed by using the back-blowing air flow, the air flow with a certain flow rate is instantaneously sprayed to the surface of the membrane filter element 60, the falling dust falls into the dust storage box 11 through the communication box 14, and the functions of removing the dust and self-cleaning the membrane filter element 60 are achieved.

[0050] The rail dust collecting system is matched with the rail milling vehicle, the dust collecting and collecting can be far away from the dust milling device through the pipeline, is not limited by the original structure position, can cool in the dust conveying bellows 12, can absorb all the milling dust generated during the operation, can be deposited in the dust filtering box 70, can be stored in the dust storage box 12 through the communication box 14, and can be uniformly treated after the milling operation is completed. The air is filtered by the membrane filter element 60 in the dust filtering box 70, the dust particles are separated from the air, the clean air enters the upper layer of the dust filtering box 70, and is discharged through the high-pressure fan 10, and the dust particles are blocked by the membrane filter element 60 and fall through the communication box 14 and accumulate in the dust storage box 11. In addition, the membrane filter element 60 can be replaced through the side door of the dust filtering box 70, the filter element is convenient to replace, can be quickly replaced, is convenient for the operator to clean, and is convenient and fast.

[0051] In the embodiment, the dust filtering box 70, the communication box 14 and the dust storage box 11 are arranged from top to bottom in sequence, and the caliber of the communication box 14 is smaller than that of the dust filtering box 70 and the dust storage box 11, and the three form a “thin waist” shape as a whole, so that the dust storage box 11 has a large capacity and the dust can easily enter the dust storage box 11, and the dust is inhibited from being rolled up and scattered by the negative pressure, so that the dust can be stably collected.

[0052] The above is the preferred embodiment of the present application, of course, cannot be limited by the scope of the present invention, should be noted that for ordinary skilled in the art, without departing from the principles of the present invention, can also make a number of improvements and changes, these improvements and changes are also considered to be within the scope of the present invention.

Claims

1. A method of collecting rail milling dust, characterized by, The method comprises the following steps: The high-pressure fan works to form a negative pressure in the dust filtering box through the fan air inlet pipe, to collect the dust generated after the rail milling and grinding through the dust conveying hard pipe, the dust conveying corrugated pipe and the milling dust collecting port, to use the flow rate formed by the air in the pipeline to suck the dust into the dust filtering box, and to make most of the dust fall down due to the flow rate drop after entering the large space and to be accumulated into the dust storage box through the communication box, and to make the air containing a small amount of dust filtered through the membrane filter element in the dust filtering box and discharged into the air along the fan air inlet pipe through the high-pressure fan, wherein the milling dust collecting port is in the shape of a flat rectangular parallelepiped, has a dust inlet at the front end, and the upper surface extends obliquely and gradually rises from the dust inlet backward. A part of the substandard particles are adsorbed on the surface of the membrane filter element, the high-pressure air is controlled to enter the jet pipe of the metal rotating wing in the membrane filter element through the electromagnetic valve, the jet pipe naturally rotates under the high-pressure air flow, the operation of the jet pipe is controlled by using the pulse stroke, the jet pipe hits the membrane filter element by using the air flow sprayed from the jet hole under the stroke, the boom rotates under the stroke, the particles adsorbed on the surface of the membrane filter element are removed by using the back-blowing air flow, the air flow with a certain flow rate is instantaneously sprayed to the surface of the membrane filter element, and the falling dust falls into the dust storage box through the communication box.

2. A rail milling dust collection system characterized by, The method comprises the following steps: The high-pressure fan is installed at the top of the dust filtering box, the air inlet of the high-pressure fan is communicated with the upper box body of the dust filtering box through the fan air inlet pipe, the membrane filter element is installed in the dust filtering box, the metal rotating wing is installed in the membrane filter element to remove the particles adsorbed on the surface of the membrane filter element, the milling dust collecting port is used to collect the dust generated after the rail milling and grinding and is communicated with the lower box body of the dust filtering box through the pipeline, the dust storage box is connected below the dust filtering box through the communication box, and the milling dust collecting port is in the shape of a flat rectangular parallelepiped, has a dust inlet at the front end, and the upper surface extends obliquely and gradually rises from the dust inlet backward. The metal rotating wing comprises the following components: The air inlet pipe is fixed to the top of the dust filtering box through the triangular support frame, the boom is rotatably connected to the end of the air inlet pipe inserted into the membrane filter element through the upper bearing sleeve, the two jet pipes are communicated with the boom and are respectively located on the two sides of the boom, and the lower bearing sleeve is connected between the bottom of the boom and the jet pipe. The lifting disc for covering the opening at the top of the membrane filter element is installed on the air inlet pipe through the spring. The electromagnetic valve is fixed to the upper box body of the dust filtering box to control the high-pressure air to enter the boom through the air inlet pipe, the jet pipe naturally rotates under the high-pressure air flow, the air flow sprayed from the jet hole of the jet pipe hits and removes the particles adsorbed on the surface of the membrane filter element. The front end of the upper surface is located at the middle of the upper and lower direction of the two side walls of the milling dust collecting port.

3. The rail milling dust collection system of claim 2, wherein, The dust conveying hard pipe is connected to the end of the dust conveying corrugated pipe away from the milling dust collecting port, and the other end of the dust conveying hard pipe is fixed to the lower box body of the dust filtering box. The milling dust collecting port is made of copper material. ​ ​ ​ 4. The rail milling dust collection system of claim 3, wherein, ​ 5. The rail milling dust collection system of claim 3, wherein, ​ 6. The rail milling dust collection system of claim 2, wherein, ​ 7. The rail milling dust collection system of claim 2, wherein, ​ 8. The rail milling dust collection system of claim 2, wherein, ​ 9. The rail milling dust collection system of claim 2, wherein, The dust filtering box is fixed with a pressure sensor.

10. The rail milling dust collection system of claim 2, wherein, The communication box extends in the up-down direction and has a smaller diameter than the dust filtering box and the dust storage box.

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