Sanding electromagnetic valve

Abstract

The utility model discloses a sanding electromagnetic valve which comprises a valve body and a valve seat, a sand inlet connected with a sand box is arranged on the upper portion of the valve body, a sand outlet connected with a sand outlet guide pipe is arranged at the front end of the valve body, an air inlet used for introducing compressed air is arranged on one side of the valve body, an independent screening unit is arranged in the valve body, and an impurity discharging port is arranged on the lower portion of the valve body. The screening unit forms a screening channel communicating the sand inlet and the sand outlet in the valve body, a screening drum, a rotating shaft and a plurality of shifting pieces are arranged in the screening unit, the rotating shaft and the screening drum are driven by a micro motor to rotate at a high speed, and fine impurities in sand are thrown out of the screening drum and then discharged through an impurity discharging port by means of compressed air input through an air inlet. Besides, the valve body is further provided with an electromagnetic ball valve for controlling on-off of the sand outlets, and the electromagnetic ball valve adopts a two-position three-way structure and is matched with two groups of sand outlets, so that flexible switching of sand output under multiple working conditions is realized. The anti-skid motor train unit effectively prevents the problem of blockage caused by impurities in sand, and therefore the anti-skid performance of the motor train unit under the severe road surface condition is improved.

Description

Technical Field

[0001] This utility model relates to the field of railway transportation equipment technology, specifically to a sand-spreading solenoid valve. Background Technology

[0002] With the continuous development of high-speed rail technology and the increasing frequency of EMU (Electric Multiple Unit) train operations, the safe and stable operation of trains under various complex weather conditions has become a critical issue that urgently needs to be addressed in the railway transportation sector. Especially in rainy weather, the slippery nature of the track surface can easily cause the wheelsets of EMU trains to spin and slip during operation. This not only leads to increased wear between the wheelsets and the rails but may also cause train instability, thus posing safety hazards.

[0003] Currently, anti-skid systems on high-speed trains generally employ sand-spreading devices. This involves delivering pre-stored sand, meeting stringent technical requirements, from a sand box to the wheel and rail via a sand-spreading solenoid valve. This improves the adhesion between the wheel and rail, ensuring the train's traction and braking performance in rainy or slippery conditions. The sand used for anti-skid is carefully designed in terms of hardness, particle size, and adhesion to achieve optimal anti-skid performance. However, a common drawback of existing technology is the lack of automatic sieving of fine impurities in the sand by the sand-spreading solenoid valve. To prevent these impurities from entering the solenoid valve and causing blockages, traditional processes often require operators to manually sift the sand before adding it. This not only increases the workload and labor intensity but also poses a risk of incomplete sieving affecting the stability of the sand-spreading system.

[0004] Therefore, there is an urgent need to design a sand-spreading solenoid valve to meet the actual needs of railway transportation for anti-slip systems. Utility Model Content

[0005] The purpose of this utility model is to provide a sand-spreading solenoid valve that can automatically filter out small impurities in sand, ensuring that the sand particles entering the sand-spreading system are uniform and meet technical requirements, thereby effectively preventing valve failure caused by impurities clogging the valve body, and further improving the anti-skid effect and safety stability of trains when running in rainy weather.

[0006] The technical solution adopted by this utility model to solve the above problems is: a sand-spreading solenoid valve, including a valve body and a valve seat. The valve body is provided with a sand inlet for connecting to a sand box at the top, a sand outlet for connecting to a sand outlet conduit at the front end of the valve body, an air inlet for introducing compressed air on one side of the valve body, a screening unit for screening fine impurities inside the valve body, and a waste discharge port at the bottom.

[0007] Preferably, the valve body is provided with a screening channel, which connects the sand inlet and the sand outlet. The screening channel is provided with a screening section, which is provided with a screen cylinder. A rotating shaft is rotatably provided inside the screen cylinder. The two ends of the rotating shaft are respectively rotatably connected to the shaft frame fixed at both ends of the screen cylinder. Several paddles are provided around the rotating shaft. Fine impurities are thrown out to the outside of the screen cylinder through the paddles. The impurity discharge port is connected to the screening section on the outside of the screen cylinder.

[0008] Preferably, the rotating shaft is equipped with a micro motor that drives its rotation, and the valve body is provided with a terminal block connected to the micro motor.

[0009] Preferably, the valve body is equipped with an electromagnetic ball valve for controlling the opening and closing of the sand outlet.

[0010] Preferably, the sand outlet is provided in two sets, and the electromagnetic ball valve is a two-position three-way electromagnetic ball valve, with the two working positions respectively connected to one of the sand outlets.

[0011] Preferably, the valve seat has several circular mounting holes at both ends.

[0012] Preferably, the valve body is provided with an inspection port that communicates with the interior of the valve body.

[0013] Preferably, both the sand inlet and the sand outlet are provided with threaded connection structures and are fitted with a housing.

[0014] Compared with the prior art, this utility model has the following advantages and effects:

[0015] This invention achieves automatic screening and effective removal of fine impurities in the sand entering the system by independently setting a screening unit within the valve body of the sand-spreading solenoid valve, ensuring that all sand particles entering the sand outlet pipe meet technical requirements. Simultaneously, by using a micro-motor to drive the rotating shaft and screen cylinder at high speed, combined with the centrifugal and purging effects of compressed air input through the air inlet, fine impurities are quickly thrown out to the outside of the screen cylinder and discharged through the impurity discharge port during the screening process, effectively preventing solenoid valve or sand outlet pipe malfunctions caused by impurities clogging the system. Furthermore, the rational combination design of two sets of sand outlets and a two-position three-way solenoid ball valve enables flexible switching of the sand output channel under various working conditions, ensuring that if one set of sand outlets is blocked or under maintenance, the other set can still operate normally, thus significantly improving the reliability and adaptability of the sand-spreading system. In summary, this invention not only significantly reduces the labor intensity of manual sand screening but also ensures the uniform output of anti-slip sand, further improving the anti-slip effect and driving safety of the train in rainy weather and on slippery road conditions. Attached Figure Description

[0016] Figure 1 This is a perspective view of a sand-spreading solenoid valve according to an embodiment of this utility model.

[0017] Figure 2 This is a perspective view of a sand-spreading solenoid valve according to an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the screening unit in an embodiment of this utility model.

[0019] Figure 4 This is a cross-sectional view of a sand-spreading solenoid valve according to an embodiment of this utility model.

[0020] Figure 5 This is a cross-sectional view of a sand-spreading solenoid valve according to an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram illustrating the working principle of the electromagnetic ball valve according to an embodiment of this utility model.

[0022] Figure numbers: Valve body 11, Valve seat 12, Sand inlet 13, Sand outlet 14, Air inlet 15, Screening unit 16, Impurity outlet 17, Sand guide pipe 18, Sand outlet guide pipe 19, Screening channel 21, Screening section 22, Screen cylinder 23, Rotating shaft 24, Shaft bracket 25, Paddle 26, Micro motor 27, Terminal block 28, Solenoid ball valve 31, Sand outlet A port 32, Sand outlet B port 33, Sand inlet P port 34, Mounting hole 35, Inspection port 36, Threaded connection structure 37, Housing 38. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0024] Example:

[0025] See Figure 1 - Figure 6 This embodiment relates to a sand-spreading solenoid valve, specifically used for the automatic screening and uniform output of sand in the anti-skid system of a high-speed train, to improve the traction and driving stability of the train in rainy weather and on slippery road conditions. Specifically, it includes a valve body 11 and a valve seat 12. The valve body 11 has a sand inlet 13 for connecting to a sand box at its upper part, a sand outlet 14 for connecting to a sand outlet conduit 19 at its front end, an air inlet 15 for introducing compressed air on one side of the valve body 11, a screening unit 16 for screening fine impurities inside the valve body 11, and a waste discharge port 17 at its lower part.

[0026] Specifically, in this embodiment, the valve seat 12 is used to install the valve body 11 onto the sand spreading device. The sand inlet 13 of the valve body 11 is connected to the sand box through the sand guide pipe 18, and the sand outlet 14 is used to connect the sand outlet guide pipe 19 (a rubber tube with a length of 15-25cm), which can reduce the distance between the sand and the track surface. The sand outlet guide pipe 19 will not fall off or bend after being bumped, and it can be disassembled to ensure that the sand is accurately and evenly spread onto the track surface. The air inlet 15 introduces compressed air from the main air cylinder, which discharges the fine impurities screened by the screening unit 16 from the impurity discharge port 17, so that the sand with particle size meeting the technical requirements flows onto the track through the sand outlet 14 and the sand guide pipe, thereby completing the sand spreading.

[0027] This invention achieves automatic screening and removal of fine impurities in sand by installing an independent screening unit 16 on the valve body 11 of the sand-spreading solenoid valve, thereby effectively solving the problem of anti-slip system failure caused by impurities in sand clogging the solenoid valve and sand guide tube in the prior art.

[0028] See Figure 2 - Figure 5 The valve body 11 is provided with a screening channel 21, which connects the sand inlet 13 and the sand outlet 14. The screening channel 21 is provided with a screening section 22, which is provided with a screen cylinder 23. A rotating shaft 24 is rotatably installed inside the screen cylinder 23. The two ends of the rotating shaft 24 are respectively rotatably connected to the shaft brackets 25 fixed at both ends of the screen cylinder 23. Several deflectors 26 are arranged around the rotating shaft 24. Small impurities are thrown out to the outside of the screen cylinder 23 through the deflectors 26. The impurity discharge port 17 is connected to the screening section 22 on the outside of the screen cylinder 23. The rotating shaft 24 is adapted to a micro motor 27 to drive its rotation. The valve body 11 is provided with a terminal 28 connected to the micro motor 27. In this embodiment, the rotating shaft 24 driven by the micro motor 27 drives the paddle 26 to rotate. Under the action of centrifugal force, the sand and mixed fine impurities are lifted up. Then, with the help of the compressed air input by the air inlet 15, the fine impurities are blown out by the paddle 26 to the outside of the screen cylinder 23 and discharged through the impurity discharge port 17 when the sand passes through the screening channel 21. This effectively ensures that the size of the sand particles flowing out from the sand outlet 14 meets the predetermined requirements.

[0029] The valve body 11 is equipped with an electromagnetic ball valve 31 that controls the opening and closing of the sand outlet 14. The electromagnetic ball valve 31 achieves real-time regulation of sand flow through electromagnetic engagement and disengagement, allowing for timely start or stop of sand output as needed. The sand outlet 14 has two sets, including outlet A 32 and outlet B 33. The electromagnetic ball valve 31 is a two-position three-way electromagnetic ball valve 31, which has a sand inlet P 34. The two working positions are respectively connected to one set of sand outlets 14. (See also...) Figure 6The first operating position of the solenoid ball valve 31 is: the sand inlet P port 34 is connected to the sand outlet A port 32, and disconnected from the sand outlet B port 33; the second operating position of the solenoid ball valve 31 is: the sand inlet P port 34 is disconnected from the sand outlet A port 32, and connected to the sand outlet B port 33. In this embodiment, the sand outlet A port 32 and the sand outlet B port 33 are respectively connected to a set of sand outlet conduits 19. When a set of sand outlet conduits 19 becomes blocked, it can be switched to another set of sand outlets 14 to continue working, avoiding the impact of partial failure causing the inability to complete sand spreading, and improving the reliability of the sand spreading solenoid valve.

[0030] The valve seat 12 has several circular mounting holes 35 at both ends, which can be used to detachably connect and fix the valve seat 12 to the main structure of the sand spreading device with threaded fasteners such as bolts, which facilitates installation, debugging and subsequent maintenance and replacement.

[0031] The valve body 11 is provided with an inspection port 36 that communicates with the interior of the valve body 11. The screen cylinder 23 is worn, and long-term use will cause the screen cylinder 23 to become blocked or even broken, affecting the screening effect. In this embodiment, maintenance personnel can regularly inspect and clean the interior of the valve body 11 through the inspection port 36, and at the same time facilitate the replacement of the screen cylinder 23.

[0032] Both the sand inlet 13 and the sand outlet 14 are equipped with threaded connection structures 37 and fitted with sleeves 38. The sand inlet 13 is connected to the sand guide pipe 18, and the sand outlet 14 is connected to the sand outlet guide pipe 19 via the threaded connection structures 37. A sealing ring is provided at the threaded connection structure 37 to ensure the sealing performance of the connection. At the same time, the sleeves 38 protect the threaded connection structure 37, reducing the risk of damage to the threaded connection structure 37 caused by bumps or knocks before valve body 11 installation, which could affect the sealing effect at the connection.

[0033] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A sanding solenoid valve comprising a valve body and a valve seat, characterized by: The valve body is provided with a sand inlet for connecting with a sand box, a sand outlet at the front end of the valve body for connecting with a sand outlet pipe, an air inlet at one side of the valve body for connecting with compressed air, a screening unit in the valve body for screening small impurities, and a discharge port at the bottom.

2. A sanding solenoid valve according to claim 1, characterized in that: The valve body is provided with a screening channel, which is communicated with the sand inlet and the sand outlet, and is provided with a screening part, which is provided with a screen cylinder, and a rotating shaft is arranged in the screen cylinder, two ends of the rotating shaft are rotatably connected to shaft supports fixed at two ends of the screen cylinder, and a plurality of flippers are arranged on the rotating shaft in the circumferential direction, and small impurities are thrown out to the outside of the screen cylinder through the flippers.

3. A sanding solenoid valve according to claim 2, characterized in that: The rotating shaft is matched with a micro motor for driving the rotating shaft to rotate, and the valve body is provided with a terminal post connected with the micro motor.

4. The sanding solenoid valve according to claim 1, wherein: The valve body is provided with an electromagnetic ball valve for controlling the on-off of the sand outlet.

5. A sanding solenoid valve according to claim 4, characterized in that: The sand outlet is provided with two groups, the electromagnetic ball valve is a two-position three-way electromagnetic ball valve, and two working positions are communicated with one of the groups of sand outlets.

6. A sanding solenoid valve according to claim 1, characterized in that: A plurality of circular mounting holes are formed at two ends of the valve seat.

7. The sanding solenoid valve of claim 1, wherein: The valve body is provided with an inspection port communicated with the inside of the valve body.

8. The sanding solenoid valve of claim 1, wherein: The sand inlet and the sand outlet are provided with threaded connection structures and are matched with sleeves.

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