Change-over valve for sand feeding trolley of motor train unit

Abstract

The utility model relates to the technical field of change-over valves, in particular to a change-over valve for a sand feeding trolley of a motor train unit, which comprises a valve body, an upper cushion table and a control motor, the upper cushion table is fixed on the top surface of the valve body, the control motor is arranged on the top surface of the upper cushion table, and an output shaft of the control motor rotatably penetrates into the upper cushion table and is fixedly provided with a valve rotating shaft. A ball used for opening and closing is fixed to the end, extending into the valve body, of the valve rotating shaft. Through the ball body cleaning assembly, when a ball body is closed, cleaning scraping sleeves on the two sides can clean sand grains on the surface of the ball body, the situation that when the ball body is opened or closed to rotate, the sand grains are driven to make contact and friction with the inner wall of the valve body is avoided, and therefore abrasion of the ball body and the valve body in use is reduced; the service life of the change-over valve is prolonged, and meanwhile the convenience of maintenance of the change-over valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of conversion valves, in particular to a conversion valve for a sand loading trolley of an EMU. Background Art

[0002] When EMUs encounter adverse weather conditions such as rain, snow, and ice, the friction coefficient between the wheels and rails will decrease, which can easily cause the wheels to slip or spin, affecting driving safety. Therefore, it is necessary to spread dry quartz sand and other materials to increase the friction coefficient between the wheels and rails, effectively solve the problem of wheel slippage, and ensure that the EMU stops within the specified braking distance. The sand spreading device usually consists of a sand spreader, a sand spreading electro-pneumatic valve, a sand box, and pipelines. The driver operates the sand spreading electro-pneumatic valve, and under the action of compressed air, the sand in the sand box enters the sand spreading pipe through the sand spreader and is finally spread on the rail surface in the front direction of the wheel running direction.

[0003] When the currently used ball conversion valve is in use, sand particles will be ejected under the drive of compressed air. When the valve is closed, sand particles will remain inside the valve body. As a result, when the internal ball rotates to close, some sand particles will remain inside and on the surface of the ball. When the ball rotates to close, the surface contacts the surface of the valve body. At this time, the sand particles on the surface will increase the friction between the surface of the ball and the inner wall of the valve body, thereby increasing the wear on the surface of the ball. In view of the above defects, the present utility model is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a conversion valve for a sand loading trolley of an EMU, so as to solve the problem raised.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a switching valve for a sand loading trolley on an EMU, comprising a valve body, an upper pad, and a control motor, wherein the upper pad is fixed to the top surface of the valve body, the control motor is provided on the top surface of the upper pad, and the output shaft of the control motor rotates and passes through the interior of the upper pad and is fixed with a valve shaft, and a ball for opening and closing is fixed to one end of the valve shaft extending into the interior of the valve body;

[0006] Both ends of the valve body are detachably fixed with side sealing plates by bolts, and both ends of the sphere are rotatably fitted with cleaning scraping sleeves for scraping off sand and gravel, and the two cleaning scraping sleeves are respectively clamped and fixed between the valve body and the side sealing plates.

[0007] Preferably, the two side sealing plates are fixed with connecting clips on one side close to the cleaning scraper sleeve, the outer side of the cleaning scraper sleeve is provided with a connecting groove that cooperates with the connecting clips, the outer surface of the two cleaning scraper sleeves away from the spherical end are fixed with limiting ring plates, and a fixing ring plate is fixed on the inner wall of the valve body inside the limiting ring plate.

[0008] Preferably, a plurality of positioning rods are fixed at equal distances on one side of the two connecting rings close to the cleaning scraper sleeve, and a plurality of positioning grooves cooperating with the positioning rods are opened at equal distances inside the cleaning scraper sleeve inside each connecting groove to limit the cleaning scraper sleeve.

[0009] Preferably, a fixed thread groove is provided inside the cleaning scraper sleeve inside each positioning groove, and a connecting screw tube is threadedly sleeved inside the fixed thread groove, and a cleaning cotton sleeve is fixed on the side of the two connecting screw tubes facing the sphere.

[0010] Preferably, the outer ring diameter of each of the limiting ring plates is larger than the inner ring diameter of the fixed ring plate, and the outer ring diameter of each of the limiting ring plates is smaller than the outer ring diameter of the fixed ring plate, and is used to cooperate with the side sealing plate to clamp and fix the cleaning scraper sleeve.

[0011] Preferably, the two cleaning scraper sleeves and the cleaning cotton sleeve are both configured to have an arc shape facing the sphere so as to fit the outer surface of the sphere, and the inner diameter of the sphere is equal to the inner diameter of the valve body and the side sealing plate.

[0012] Preferably, the two fixed thread grooves are provided with threads at one end close to the side sealing plate that cooperate with the outer surface of the connecting screw tube. The connecting screw tube is arranged in a ring shape that cooperates with the fixed thread groove, and the inner ring diameter of the cleaning scraper sleeve is equal to the inner ring diameter of the side sealing plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The utility model is provided with a ball cleaning assembly. When the ball is closed, the cleaning scrapers on both sides can clean the sand on the surface of the ball to avoid the sand from contacting and rubbing with the inner wall of the valve body when the ball is opened or closed, thereby reducing the wear of the ball and the valve body during use. The detachable design of the cleaning sleeve makes it easy to remove and clean, which not only increases the service life of the conversion valve, but also ensures the convenience of maintenance of the conversion valve.

[0015] 2. In the utility model, the surface of the sphere can be further wiped by cleaning the cleaning cotton sleeve inside the scraper sleeve to prevent sand particles from being blown into the valve body outside the sphere, and the cleaning cotton sleeve can be separately disassembled and replaced. During the normal maintenance of the conversion valve, after the cleaning hanging sleeve is taken out, the cleaning cotton sleeve can be separated and cleaned or replaced separately, which can better protect the conversion valve during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view schematic diagram of the conversion valve structure of the present utility model;

[0017] Figure 2 This is a front cross-sectional schematic diagram of the local structure of the conversion valve of the present utility model;

[0018] Figure 3 This is a front cross-sectional schematic diagram of the local structure of the conversion valve of the present invention when it is closed;

[0019] Figure 4 This is a schematic left side view of the partial structure of the conversion valve of the present utility model;

[0020] Figure 5 It is a right side schematic diagram of the partial structure of the conversion valve of the present invention.

[0021] The numbers in the figure represent:

[0022] 1. Valve body; 2. Upper pad; 3. Control motor; 4. Valve shaft; 5. Ball; 6. Side sealing plate; 7. Cleaning scraper sleeve; 8. Connecting clamp ring; 9. Connecting groove; 10. Positioning rod; 11. Positioning groove; 12. Limiting ring plate; 13. Fixed ring plate; 14. Connecting screw tube; 15. Cleaning cotton sleeve; 16. Fixed thread groove. DETAILED DESCRIPTION

[0023] The following further illustrates the above and other technical features and advantages of the present invention in conjunction with the accompanying drawings and embodiments. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive. Example

[0024] like Figure 1-5 As shown, the utility model provides a switching valve for a sand loading trolley of an EMU, comprising a valve body 1, an upper pad 2 and a control motor 3. The upper pad 2 is fixed to the top surface of the valve body 1, and the control motor 3 is provided on the top surface of the upper pad 2. The output shaft of the control motor 3 rotates and passes through the interior of the upper pad 2 and is fixed with a valve shaft 4. The end of the valve shaft 4 extending into the interior of the valve body 1 is fixed with a ball 5 for opening and closing.

[0025] Both ends of the valve body 1 are detachably fixed with side sealing plates 6 by bolts. Both ends of the ball 5 are rotatably fitted with cleaning scraper sleeves 7 for scraping off sand and gravel. The two cleaning scraper sleeves 7 are respectively fixed between the valve body 1 and the side sealing plates 6.

[0026] The two side sealing plates 6 are fixed with a connecting snap ring 8 on one side close to the cleaning scraper sleeve 7, and the outer side of the cleaning scraper sleeve 7 is provided with a connecting groove 9 that cooperates with the connecting snap ring 8. The outer surface of the two cleaning scraper sleeves 7 away from the end of the sphere 5 is fixed with a limiting ring plate 12, and a fixing ring plate 13 is fixed on the inner wall of the valve body 1 on the inner side of the limiting ring plate 12. When the sphere 5 rotates, the sand on the surface can be removed by scraping the cleaning scraper sleeve 7.

[0027] A plurality of positioning rods 10 are fixed equidistantly on one side of the two connecting clamps 8 close to the cleaning scraper sleeve 7. A plurality of positioning grooves 11 cooperating with the positioning rods 10 are equidistantly opened inside the cleaning scraper sleeve 7 inside each connecting groove 9 to limit the cleaning scraper sleeve 7. When the cleaning scraper sleeve 7 is sleeved on the connecting clamps 8 under the cooperation of the connecting grooves 9, the positioning rods 10 are aligned and inserted into the positioning grooves 11 one by one, so as to limit the cleaning scraper sleeve 7, thereby preventing relative rotation between the cleaning scraper sleeve 7 and the side sealing plate 6, and further ensuring the firmness and stability of the cleaning scraper sleeve 7 after assembly;

[0028] A fixed thread groove 16 is provided inside the cleaning scraper sleeve 7 on the inner side of each positioning groove 11, and a connecting screw tube 14 is threadedly sleeved inside the fixed thread groove 16. A cleaning cotton sleeve 15 is fixed on the side of the two connecting screw tubes 14 facing the ball 5. When in use, the connecting screw tube 14 is screwed into the fixed thread groove 16 and fixed until the surface of the cleaning cotton sleeve 15 is flush with the surface of the cleaning scraper sleeve 7. When the cleaning scraper sleeve 7 is assembled inside the valve body 1, the cleaning cotton sleeve 15 can be attached to the control motor 3 along with the cleaning scraper sleeve 7, and the hard friction of sand grains is replaced by flexible wiping to protect the surface of the ball 5 and reduce the wear of the ball 5 and the valve body 1.

[0029] The outer ring diameter of each limiting ring plate 12 is larger than the inner ring diameter of the fixed ring plate 13, and the outer ring diameter of the limiting ring plate 12 is smaller than the outer ring diameter of the fixed ring plate 13, and is used to cooperate with the side sealing plate 6 to clamp and fix the cleaning scraper sleeve 7. When the cleaning scraper sleeve 7 is inserted into the valve body 1, it drives the limiting ring plate 12 to abut against the fixed ring plate 13, and then the side sealing plate 6 is sleeved on the outside of the cleaning scraper sleeve 7. The side sealing plate 6 is fixed to the valve body 1 by bolts. The cleaning scraper sleeve 7 can be fixed to the valve body 1 under the clamping of the side sealing plate 6 and the fixed ring plate 13;

[0030] The two cleaning scraper sleeves 7 and the cleaning cotton sleeve 15 are both arranged in an arc shape facing the side of the sphere 5, which fits the outer surface of the sphere 5. The inner diameter of the sphere 5 is equal to the inner diameter of the valve body 1 and the side sealing plate 6, ensuring that the cleaning scraper sleeves 7 and the cleaning cotton sleeve 15 are slidingly fitted with the outer surface of the sphere 5, and ensuring that when the sphere 5 is opened, the valve body 1, the side sealing plate 6 and the sand inside the sphere 5 can pass through quickly and smoothly under the drive of compressed air;

[0031] The two fixed thread grooves 16 are both provided with threads that cooperate with the outer surface of the connecting screw tube 14 at one end near the side sealing plate 6. The connecting screw tube 14 is set to a ring shape that cooperates with the fixed thread groove 16. The inner ring diameter of the cleaning scraper sleeve 7 is equal to the inner ring diameter of the side sealing plate 6, ensuring that the connecting screw tube 14 can be screwed into the fixed thread groove 16 and fixed, and the connecting screw tube 14 and the cleaning cotton sleeve 15 can be embedded in the fixed thread groove 16 and ensure the flatness of the side of the cleaning scraper sleeve 7.

[0032] The above description is merely a preferred embodiment of the present invention and is intended to be illustrative rather than restrictive of the present invention. Those skilled in the art will appreciate that many changes, modifications, and even equivalents may be made to the present invention within the spirit and scope of the claims, and all of these changes will fall within the scope of protection of the present invention.

Claims

1. A conversion valve for a sand loading trolley of a motor train, characterized in that: It comprises a valve body (1), an upper pad (2) and a control motor (3), wherein the upper pad (2) is fixed on the top surface of the valve body (1), the control motor (3) is arranged on the top surface of the upper pad (2), and the output shaft of the control motor (3) rotates and passes through the interior of the upper pad (2) and is fixed with a valve shaft (4), and a ball (5) for opening and closing is fixed on one end of the valve shaft (4) extending into the interior of the valve body (1); Both ends of the valve body (1) are detachably fixed with side sealing plates (6) by bolts, and both ends of the sphere (5) are rotatably fitted with cleaning scraper sleeves (7) for scraping off sand and gravel, and the two cleaning scraper sleeves (7) are respectively clamped and fixed between the valve body (1) and the side sealing plates (6).

2. A conversion valve for a sand loading trolley for a motor vehicle as claimed in claim 1, characterized in that: A connecting clamp ring (8) is fixed to one side of the two side sealing plates (6) close to the cleaning scraper sleeve (7), and a connecting groove (9) cooperating with the connecting clamp ring (8) is provided on the outer side of the cleaning scraper sleeve (7). A limiting ring plate (12) is fixed to the outer surface of the two cleaning scraper sleeves (7) away from the spherical body (5), and a fixing ring plate (13) is fixed to the inner wall of the valve body (1) inside the limiting ring plate (12).

3. A conversion valve for a sand loading trolley for a motor train as claimed in claim 2, characterized in that: A plurality of positioning rods (10) are fixed at equal distances on one side of the two connecting clamps (8) close to the cleaning scraper sleeve (7), and a plurality of positioning grooves (11) cooperating with the positioning rods (10) are opened at equal distances inside the cleaning scraper sleeve (7) inside each connecting groove (9) for limiting the position of the cleaning scraper sleeve (7).

4. A conversion valve for a sand loading trolley for a motor vehicle as claimed in claim 3, characterized in that: A fixed thread groove (16) is provided inside the cleaning scraper sleeve (7) inside each positioning groove (11), and a connecting screw tube (14) is threadedly sleeved inside the fixed thread groove (16), and a cleaning cotton sleeve (15) is fixed on the side of the two connecting screw tubes (14) facing the sphere (5).

5. A conversion valve for a sand loading trolley for a motor train as claimed in claim 2, characterized in that: The outer diameter of each of the limiting ring plates (12) is greater than the inner diameter of the fixed ring plate (13), and the outer diameter of each of the limiting ring plates (12) is smaller than the outer diameter of the fixed ring plate (13), and is used to cooperate with the side sealing plate (6) to clamp and fix the cleaning scraper sleeve (7).

6. A conversion valve for a sand loading trolley for a motor vehicle as claimed in claim 1, characterized in that: The two cleaning scraper sleeves (7) and the cleaning cotton sleeve (15) are both arranged in an arc shape facing the sphere (5) so as to fit the outer surface of the sphere (5), and the inner diameter of the sphere (5) is equal to the inner diameter of the valve body (1) and the side sealing plate (6).

7. A conversion valve for a sand loading trolley for a motor vehicle as claimed in claim 4, characterized in that: The two fixed thread grooves (16) are provided with threads at one end close to the side sealing plate (6) for matching with the outer surface of the connecting screw tube (14). The connecting screw tube (14) is arranged in a ring shape for matching with the fixed thread groove (16). The inner diameter of the cleaning scraper sleeve (7) is equal to the inner diameter of the side sealing plate (6).

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