Leakage prevention structure of injection device and injection device

Abstract

To provide a leakage prevention structure of a jetting device capable of preventing leakage of a jetted object from a storage part with an inexpensive and simple structure and a jetting device.SOLUTION: A leakage prevention structure 10 prevents the leakage of a jetted object M1 from a storage part 6R for storing the jetted object M1 which is jetted between a rail and a wheel and includes a suction pipe part 11 sucking the jetted object M1 in the storage part 6R. The suction pipe part 11 guides the jetted object M1 to a mixing part 7 for mixing the jetted object M1 and a compressed gas G at a lower part of the storage part 6R via an upper part of the storage part 6R from the lower part of the storage part 6R. A jetting device includes a vent pipe part 9 connecting the inside of the storage part 6R and the inside of the mixing part 7. The suction pipe part 11 is arranged such that a part of the suction pipe part 11 is laid inside the vent pipe part 9. The suction pipe part 11 is laid inside the vent pipe part 9 such that a center line of the suction pipe part 11 is shifted toward an upstream side of the mixing part 7 from a center line of the vent pipe part 9.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a leakage prevention structure of an injection device for preventing leakage of an injection material from a storage portion of the injection device that stores the injection material to be injected between a rail and a wheel, and an injection device that injects the injection material between the rail and the wheel.

Background Art

[0002] In a railway vehicle, an injection device that injects an adhesion improver such as ceramics or silica sand between a rail and a wheel is attached to a bogie to prevent wheel spin or skidding of the vehicle and to ensure a braking distance. A conventional injection device includes a storage container that stores an adhesion improver, an air introduction pipe into which compressed air is introduced, a mixing pipe that sucks the adhesion improver in the storage container from a suction hole and mixes the adhesion improver and the compressed air, a nozzle portion that injects compressed air from the air introduction pipe into the mixing pipe, an injection pipe that injects the adhesion improver and the compressed air from the mixing pipe, a ventilation pipe that connects the mixing pipe and the storage container, and the like (see, for example, Patent Document 1). In such a conventional injection device, when injecting the adhesion improver, compressed air of about 0.5 Mp is introduced from the air introduction pipe to make the pressure in the mixing pipe and the storage container about 0.2 MPa. In the conventional injection device, a suction hole is formed below the mixing pipe so as to penetrate the mixing pipe, and the adhesion improver in the storage container below the suction hole is sucked into the mixing pipe through the suction hole, and the adhesion improver and the compressed air are mixed in the mixing pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A conventional injection device 101 shown in FIGS. 12 and 13 has compressed air G flowing into a mixing pipe 107 AIt is being injected from the injection port 108c of the movable throttle part 108 into the mixing chamber 107g. In the conventional injection device 101, when compressed air G A is injected into the mixing chamber 107g, the adhesion-increasing material M in the storage container 106 is sucked into the mixing chamber 107g through the suction hole 107f, and the compressed air G A mixed with the adhesion-increasing material M in the mixing chamber 107g is discharged from the mixing pipe 107. The suction hole 107f is formed to have an inner diameter of about 2.5 mm so that the adhesion-increasing material M in the storage container 106 is sucked into the mixing chamber 107g.

[0005] In the conventional injection device 101, when the railway vehicle runs on the track, it vibrates together with the bogie of the railway vehicle. For this reason, in the conventional injection device 101, even when it is in a non-injection state where compressed air G A is not supplied, when the railway vehicle vibrates, the adhesion-increasing material M in the storage container 106 may rise from the suction hole 107f of the mixing pipe 107 and leak naturally into the mixing pipe 107. As a result, in the conventional injection device 101, there is a problem that the adhesion-increasing material M leaks naturally from the storage container 106, and the adhesion-increasing material M in the storage container 106 is wasted. Further, in the conventional injection device 101, the adhesion-increasing material M leaked into the mixing pipe 107 may move to the movable throttle part 108 on the upstream side, and there may occur a phenomenon that the adhesion-increasing material M leaked into the mixing pipe 107 passes through the movable throttle part 108 and moves to the upstream side of the mixing pipe 107. As a result, when compressed air G A is supplied to the mixing pipe 107, the adhesion-increasing material M accumulated on the upstream side of the mixing pipe 107 is pushed out toward the movable throttle part 108 side, and there is a problem that the movable throttle part 108 is clogged by the adhesion-increasing material M.

[0006] An object of the present invention is to provide a leakage prevention structure and an injection device for an injection device that can prevent leakage of an injection object from a storage part with an inexpensive and simple structure.

Means for Solving the Problem

[0007] The present invention solves the above problems by the following solution means. Note that the embodiments of the present invention will be described with corresponding reference numerals, but the present invention is not limited to these embodiments. As shown in FIGS. 1, 2, 3, and 7, the invention according to claim 1 is directed to a leakage prevention structure of an injection device for preventing leakage of an injection object (M1) injected between a rail (R R , R L ) and a wheel (W R , W L ). The leakage prevention structure includes a suction pipe portion (11) that sucks the injection object within the storage portion. The suction pipe portion guides the injection object from below the storage portion, through the upper part of the storage portion, to a mixing portion (7) below the storage portion where the injection object is mixed with a compressed gas (G). ki , A part of the suction pipe portion is piped inside a ventilation pipe portion (9) that connects the inside of the housing portion and the inside of the mixing portion. The leakage prevention structure (10) of the injection device is characterized by the above.

[0008] The invention according to claim 2 is the leakage prevention structure of the injection device according to claim 1 . As shown in FIGS. 8(A) and 8(C), the suction pipe portion is characterized in that the center line (L2) of the suction pipe portion is shifted to the upstream side of the mixing portion from the center line (L1) of the ventilation pipe portion and is piped inside the ventilation pipe portion.

[0009] The invention according to claim 3 is the leakage prevention structure of the injection device according to claim 1 Or claim 2 . As shown in FIGS. 8(A) and 8(B), the leakage prevention structure of the injection device is characterized in that the distance (d) between the center line (L3) of the injection port (8c) for injecting the compressed gas in the mixing portion and the discharge port (11e) of the suction pipe portion is within a predetermined range.

[0010] The invention according to claim 4 is the leakage prevention structure of the injection device according to any one of claims 1 to 3 . As shown in FIGS. 3 and 7, the leakage prevention structure of the injection device is characterized in that the uppermost part (11c) of the suction pipe portion is located above the surface (S) of the injection object within the storage portion.

[0011] The invention according to claim 5 is an injection device for injecting an ejecta (M1) between a rail (R R , R L ) and a wheel (W R , W L ), and as shown in FIGS. 1 to 3, it is characterized by comprising a leakage prevention structure (10) of the injection device according to any one of claims 1 to 4 inclusive of the injection device (1).

Effect of the Invention

[0013] According to this invention, leakage of the ejecta from the accommodating portion can be prevented with an inexpensive and simple structure.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The line R shown in FIGS. 1 and 2 is a passage (track) on which a railway vehicle travels. The line R is, as shown in FIG. 1, a pair of rails R that guide the wheels W R ,W L and the like. The rails R R ,R L and the like are provided. The rails R R ,R L guide the wheels WR ,W L It includes a top surface (upper surface of the head) R1 that directly supports [,W], and an inner head side surface R2 that is continuous with this top surface R1. As shown in Fig. 2, the rail R R ,R L and the wheel W R ,W L At the contact point P between [,W] and the vertical force W and the tangential force F act. The proportional coefficient of the tangential force F with respect to the vertical force W (tangential force coefficient (traction coefficient)) F / W is the friction coefficient, and the maximum value of this friction coefficient is the adhesion coefficient.

[0016] The wheel W shown in Figs. 1 and 2 R ,W L is a member that rotates and contacts the left and right rails R R ,R L respectively. The wheel W R ,W L As shown in Fig. 1, it has a wheel tread surface W1 that contacts the top surface R1 of the rail R R ,R L and receives frictional resistance, and a flange surface W2 that contacts the inner head side surface R2 of the outer rail side rail R R ,R L and receives frictional resistance when the railway vehicle passes through a sharp curve.

[0017] The injection device 1 shown in Figs. 1 and 2 is a device that injects an injection object M1 between the rail R R ,R L and the wheel W R ,W L . The injection device 1 is an on-vehicle injection device that injects the injection object M1 from the side of the railway vehicle running on the track R, and moves together with this railway vehicle in the state of being mounted on this railway vehicle. Here, the injection object M1 is an adhesion-increasing material that improves the adhesion coefficient between the rail R R ,R L and the wheel W R ,W L . The injection object M1 is, for example, ceramic particles such as alumina that have a function of increasing the adhesion coefficient (friction coefficient). The injection device 1 injects from the front side in the traveling direction of the railway vehicle between the rail R R ,R L and the wheel W R ,W LInjects the projectile M1 between them. When the railway vehicle travels in the direction opposite to the arrow direction shown in FIG. 1, the injection device 1 is an injection device having the same structure as this injection device from the direction opposite to the arrow direction shown in FIG. 1 to the rail R R ,R L and the wheel W R ,W L Injects the projectile M1 between them. The injection device 1 includes a gas injection part 2 shown in FIGS. 1 and 2, a flow path 3, opening and closing parts 4R, 4L, flow paths 5R, 5L, housing parts 6R, 6L, a mixing part 7 shown in FIGS. 3, 4 and 6, a movable throttle part 8 shown in FIGS. 3, 4, 6 and 7, a ventilation pipe part 9 shown in FIGS. 3 to 5, 7 and 8, a leakage prevention structure 10 shown in FIGS. 3 to 8, flow paths 12R, 12L shown in FIGS. 1 and 2, injection parts 13R, 13L, a control device 14, etc.

[0018] The gas injection part 2 shown in FIGS. 1 and 2 is a part for injecting the compressed gas G. The gas injection part 2 includes, for example, an air tank for storing the compressed gas G such as compressed air, and the gas is supplied into this air tank by a compressor. When the pressure of the gas in the air tank falls below a predetermined value, the gas injection part 2 supplies the gas into this air tank by a compressor until the pressure of the gas in this air tank reaches the predetermined value. The gas injection part 2 supplies the compressed gas G from this air tank to the flow path 3 based on the operation start signal output by the control device 14. The flow path 3 is a pipe through which the compressed gas G flows. The upstream side of the flow path 3 is connected to the gas injection part 2, and the downstream side branches into two and is respectively connected to the opening and closing parts 4R, 4L.

[0019] The opening and closing parts 4R, 4L are parts for opening and closing the flow paths 5R, 5L. The opening and closing parts 4R, 4L are, for example, opening and closing valves such as solenoid valves that generate a magnetic force when an electric current flows and open and close the flow paths 5R, 5L. The opening and closing parts 4R, 4L are respectively installed on the upstream side of the flow paths 5R, 5L, and open and close the flow paths 5R, 5L based on the opening and closing signals output by the control device 14.

[0020] The flow paths 5R and 5L are pipelines through which the compressed gas G that has passed through the opening / closing parts 4R and 4L flows. The upstream side of the flow path 5R is connected to the opening / closing part 4R, and the downstream side is connected to the accommodating part 6R. The upstream side of the flow path 5L is connected to the opening / closing part 4L, and the downstream side is connected to the accommodating part 6L. The flow paths 5R and 5L are both formed with the same cross-sectional area so that the flow rate of the compressed gas G flowing in these flow paths 5R and 5L is the same.

[0021] The accommodating parts 6R and 6L shown in FIGS. 1 and 2 are parts for accommodating the projectile M1. The accommodating part 6R accommodates the projectile M1 to be ejected between the rail R on the right side in the traveling direction R and the wheel W on the right side in the traveling direction R and ejects it. The accommodating part 6L accommodates the projectile M1 to be ejected between the rail R on the left side in the traveling direction L and the wheel W on the left side in the traveling direction. L The accommodating parts 6R and 6L are, for example, tanks for accommodating the projectile M1. When the compressed gas G that has passed through the opening / closing parts 4R and 4L flows in, the accommodating parts 6R and 6L discharge the projectile M1 together with the compressed gas G into the flow paths 12R and 12L. As shown in FIGS. 3 and 7, the accommodating parts 6R and 6L can be filled with the projectile M1 until a specified capacity limit (so-called full tank) is reached so that a space is formed above the accommodating parts 6R and 6L. The accommodating parts 6R and 6L shown in FIGS. 1 and 2 have the same structure. Hereinafter, the description will be centered on one accommodating part 6R, and the detailed description of the other accommodating part 6L will be omitted. The accommodating part 6R includes a main body part 6a shown in FIGS. 1 to 3, a lid part 6b shown in FIGS. 1 and 3, a mounting part 6c shown in FIG. 3, and the like.

[0022] The main body part 6a shown in FIGS. 1 to 3 constitutes the main body of the accommodating part 6R. The main body part 6a includes a side part 6d shown in FIGS. 3 and 5 to 7, a bottom part 6e shown in FIGS. 3, 4 and 7, an opening part 6f shown in FIG. 3, a discharge hole 6g shown in FIGS. 3 and 4, a closing part 6h, etc. The side part 6d shown in FIGS. 3 and 5 to 7 is a cylindrical part that constitutes the side surface of the main body part 6a. The bottom part 6e shown in FIGS. 3, 4 and 7 is a disk-shaped part that constitutes the bottom surface of the main body part 6a. The opening part 6f shown in FIG. 3 is a part for opening the upper side of the main body part 6a. The discharge hole 6g shown in FIGS. 3 and 4 is a part for discharging the ejecta M1 in the accommodating part 6R. The discharge hole 6g is a through hole penetrating the bottom part 6e, and is formed directly below the suction hole 107f of the mixing part 7 shown in FIGS. 12 and 13. The closing part 6h shown in FIGS. 3 and 4 is a part for closing the discharge hole 6g. The closing part 6h is detachably attachable to the discharge hole 6g, and is a plug or the like having a male screw part that meshes with a female screw part formed on the inner peripheral surface of the discharge hole 6g.

[0023] The lid part 6b shown in FIGS. 1 and 3 is a part for opening and closing the main body part 6a. The lid part 6b is detachably attached to the main body part 6a so as to open and close the opening part 6f of the main body part 6a, and is opened and closed when filling the ejecta M1 into the main body part 6a through the opening part 6f. The attachment part 6c shown in FIG. 3 is a part for detachably attaching the main body part 6a. The attachment part 6c is a plate-like member fixed integrally with the main body part 6a on the back surface of the main body part 6a, and is detachably attached to the bogie frame of the bogie of the railway vehicle.

[0024] The mixing section 7 shown in FIGS. 3, 4, and 6 is the part where the ejecta M1 and the compressed gas G are mixed. As shown in FIG. 3, the mixing section 7 is a circular tubular member having a substantially L-shaped appearance, and is integrally fixed to the main body section 6a so as to penetrate the main body section 6a as shown in FIGS. 3 and 6. The mixing section 7 is piped inside the main body section 6a and functions as a mixing pipe for mixing the ejecta M1 and the compressed gas G. As shown in FIGS. 3 and 4, the mixing section 7 is piped parallel to the bottom 6e below the main body section 6a with a slight gap between it and the bottom 6e of the main body section 6a. The mixing section 7 includes a compressed gas supply section 7a shown in FIGS. 3 and 5, a compressed gas passage section 7b shown in FIGS. 3, 4, 6, and 7, an adjustment hole 7c shown in FIGS. 3 and 6, a closing section 7d shown in FIGS. 3, 5, and 6, a closing section 7e shown in FIG. 4, a ventilation pipe connection section 7f shown in FIGS. 3, 4, and 7, a mixing chamber 7g shown in FIGS. 3, 4, and 6 to 8, a mixture passage section 7h shown in FIGS. 3, 4, and 6 to 8, a mixture discharge section 7i shown in FIGS. 3, 5, and 7, and the like.

[0025] The compressed gas supply section 7a shown in FIGS. 3 and 5 is the part that supplies the compressed gas G to the mixing section 7. As shown in FIG. 3, the compressed gas supply section 7a is formed on the upper surface of the upstream end of the mixing section 7, and the downstream end of the flow path 5R shown in FIGS. 1 and 2 is connected thereto. The compressed gas supply section 7a is a pipe joint that can detachably connect the end of the pipe constituting the flow path 5R.

[0026] The compressed gas passage section 7b shown in FIGS. 3, 4, 6, and 7 is the part through which the compressed gas G passes. The compressed gas passage section 7b is a pipe through which the compressed gas G supplied from the compressed gas supply section 7a flows. As shown in FIG. 3, the upstream side of the compressed gas passage section 7b bends substantially at a right angle upward and is connected to the compressed gas supply section 7a, and the downstream side extends horizontally toward the mixing chamber 7g.

[0027] The adjustment holes 7c shown in FIGS. 3 and 6 are parts used to adjust the aperture position of the movable aperture part 8. As shown in FIGS. 3 and 6, the adjustment holes 7c are formed at the upstream end of the mixing part 7 and are through holes penetrating the mixing part 7. The adjustment holes 7c are used when inserting a tool for adjusting the distance d between the injection port 8c of the movable aperture part 8 shown in FIGS. 8(A) and (B) and the discharge port 11e of the suction pipe part 11 into the mixing part 7. The adjustment holes 7c are formed on the center line L3 of the movable aperture part 8.

[0028] The blocking part 7d shown in FIGS. 3, 5, and 6 is a member for blocking the adjustment hole 7c. The blocking part 7d has a male screw part that meshes with a female screw part formed on the inner peripheral part of the adjustment hole 7c formed on its outer peripheral part, and is a plug or the like that is detachably attached to the adjustment hole 7c.

[0029] The blocking part 7e shown in FIG. 4 is a part for blocking the suction hole 107f. The blocking part 7e is inserted from the discharge hole 6g and attached to the suction hole 107f in order to prevent the injection material M1 from being sucked from the suction hole 107f formed in the mixing pipe 107 of the conventional injection device 101 shown in FIGS. 12 and 13. The blocking part 7e can be, for example, a tapping screw that can be threaded by itself and is threaded into the inner peripheral part of the suction hole 107f.

[0030] The ventilation pipe connection part 7f shown in FIGS. 3, 4, and 7 is a part to which the ventilation pipe part 9 is connected. The ventilation pipe connection part 7f is a through hole penetrating the upper part on the downstream side of the mixing part 7, and the lower end opening 9a of the ventilation pipe part 9 is connected thereto. The ventilation pipe connection part 7f has a female screw part formed on its inner peripheral part that meshes with a male screw part formed on the outer peripheral part of the lower end opening 9a of the ventilation pipe part 9.

[0031] The mixing chamber 7g shown in FIGS. 3, 4, 6 to 8 is a part for mixing the ejecta M1 and the compressed gas G. The mixing chamber 7g is formed downstream of the movable throttle portion 8 and below the ventilation pipe connection portion 7f. As shown in FIGS. 3 and 4, the mixing chamber 7g mixes the compressed gas G ejected from the injection port 8c of the movable throttle portion 8 and the ejecta M1 discharged from the discharge port 11e of the suction pipe portion 11, and causes these mixtures M2 to flow out to the mixture passage portion 7h.

[0032] The mixture passage portion 7h shown in FIGS. 3, 4, 6 to 8 is a part through which the mixture M2 passes. The mixture passage portion 7h is a pipe through which the mixture M2 discharged from the mixing chamber 7g flows. As shown in FIGS. 3 and 6, the upstream side of the mixture passage portion 7h is connected to the mixing chamber 7g, and the downstream side is connected to the mixture discharge portion 7i.

[0033] The mixture discharge portion 7i shown in FIGS. 3, 5, 6 and 7 is a part for discharging the mixture M2 from the mixing portion 7. The mixture discharge portion 7i is formed at the downstream end of the mixing portion 7, and the upstream end of the flow path 12R shown in FIGS. 1 and 2 is connected thereto. The mixture discharge portion 7i is a pipe joint that can detachably connect the end of the pipe constituting the flow path 12R.

[0034] The movable throttle part 8 shown in FIGS. 3, 4, 6, and 7 is a part that reduces the cross-sectional area of the flow and injects the compressed gas G. The movable throttle part 8 has a position adjustment function that can change the position of the injection port 8c of the movable throttle part 8 in the front-rear direction. By adjusting the position of the movable throttle part 8 in the front-rear direction, the suction amount of the injection object M1 sucked from the suction pipe part 11 is changed. The movable throttle part 8 is housed in the compressed gas passage part 7b so as to block the compressed gas passage part 7b. As shown in FIGS. 8(A) and 8(B), the movable throttle part 8 is arranged such that the center line L3 of the movable throttle part 8 is orthogonal to the center line L1 of the ventilation pipe part 9. The movable throttle part 8 can be replaced with the conventional movable throttle part 108 shown in FIGS. 13 and 14 without significantly modifying the structure of the conventional injection device 101, and can be detachably attached to the inner peripheral part of the compressed gas passage part 7b in the same manner as the conventional movable throttle part 108. The movable throttle part 8 includes a fixed part 8a shown in FIGS. 4, 6, and 7, a movable part 8b, an injection port 8c shown in FIGS. 4, 6, 7, and 8(A)(B), and the like.

[0035] The fixed part 8a shown in FIGS. 4, 6, and 7 is a part fixed to the inner peripheral part of the compressed gas passage part 7b. The fixed part 8a is a member having a cylindrical appearance, and a flow path through which the compressed gas G flows is formed inside the fixed part 8a. The fixed part 8a has a female screw part formed on the inner peripheral part of the compressed gas passage part 7b that meshes with a male screw part formed on the outer peripheral part of the fixed part 8a. The male screw part of the fixed part 8a is screwed into the female screw part of the compressed gas passage part 7b and is mounted inside the compressed gas passage part 7b.

[0036] The movable part 8b is a part that is movable in the front-rear direction with respect to the fixed part 8a. The movable part 8b has a male screw part formed on its outer peripheral part that meshes with a female screw part formed on the inner peripheral part of the fixed part 8a. The movable part 8b is a member with a cylindrical appearance, and a flow path on the movable part 8b side through which the compressed gas G flows is formed inside the movable part 8b so as to connect to the flow path on the fixed part 8a side. The movable part 8b is formed such that the inner diameter on the downstream side is smaller than the inner diameter on the upstream side so that the cross-sectional area of the flow path inside the movable part 8b decreases. The movable part 8b functions as a throttle like a Venturi tube that reduces the pressure and increases the flow velocity by restricting the flow of the compressed gas G. The movable part 8b has a hexagonal hole formed at the upstream end of the movable part 8b into which a tool such as a hexagonal wrench inserted from the adjustment hole 7c is detachably fitted. The movable part 8b is rotated by a tool about the center line L3 shown in Fig. 8(A) as the center of rotation, so that the male screw part of the movable part 8b meshes with the female screw part of the fixed part 8a and moves in the front-rear direction, varying the distance d between the discharge port 11e of the suction pipe part 11 and the injection port 8c. The movable part 8b approaches the injection port 8c to the discharge port 11e by rotating in the feed direction (clockwise), and moves the injection port 8c away from the discharge port 11e by rotating in the return direction (counterclockwise). Since the position of the discharge port 11e is farther from the injection port 8c than the position of the suction hole 107f of the conventional injection device 101 shown in Figs. 12 and 13, the length of the nozzle part up to the injection port 8c is formed longer than the length of the nozzle part up to the injection port 108c of the movable throttle part 108 of the conventional injection device 101.

[0037] The injection port 8c shown in Figs. 4, 6, 7, and 8(A)(B) is a part that injects the compressed gas G. The injection port 8c is a nozzle port formed at the tip of the movable part 8b, and injects the compressed gas G toward the mixing chamber 7g. The injection port 8c injects the high-speed compressed gas G with reduced pressure into the mixing chamber 7g as the compressed gas G passes from the upstream side where the cross-sectional area inside the movable part 8b is relatively large toward the downstream side where the cross-sectional area inside the movable part 8b is relatively small. As shown in Fig. 8(A), the injection port 8c is arranged such that the center line L3 of the injection port 8c coincides with the center line of the mixing chamber 7g of the mixing part 7.

[0038] The ventilation pipe portion 9 shown in FIGS. 3 to 5, FIG. 7, and FIG. 8 is a portion connecting the inside of the housing portion 6R and the mixing portion 7. The ventilation pipe portion 9 is a pipe (ventilation pipe) that connects the inside of the housing portion 6R and the inside of the mixing portion 7 such that gas passes between the housing portion 6R and the mixing portion 7 and the pressure in the housing portion 6R becomes substantially the same as the pressure in the mixing portion 7. As shown in FIGS. 3 and 7, the ventilation pipe portion 9 is a cylindrical member of a predetermined length and is linearly piped in the vertical direction inside the housing portion 6R. As shown in FIG. 7, the ventilation pipe portion 9 includes a lower end opening portion 9a, an upper end opening portion 9b, and the like. The lower end opening portion 9a is a portion that opens into the mixing portion 7 and is connected to the ventilation pipe connection portion 7f of the mixing portion 7. The upper end opening portion 9b is a portion that opens into the housing portion 6R and protrudes above the surface S of the ejectant M1.

[0039] As shown in FIGS. 3 and 4, when the ejectant M1 is ejected from the inside of the housing portion 6R into the mixing chamber 7g, the ventilation pipe portion 9 allows the compressed gas G to flow from the inside of the mixing chamber 7g into the housing portion 6R through this ventilation pipe portion 9. On the other hand, after the ejectant M1 is ejected from the inside of the housing portion 6R into the mixing chamber 7g, the ventilation pipe portion 9 allows the gas to flow out from the inside of the housing portion 6R into the mixing chamber 7g through this ventilation pipe portion 9. The ventilation pipe portion 9 discharges the gas in the housing portion 6R into the mixing chamber 7g after the ejection of the ejectant M1, thereby changing the pressure in the housing portion 6R from a high-pressure state to a normal state and preventing the ejectant M1 from leaking from the inside of the housing portion 6R into the mixing portion 7 through this ventilation pipe portion 9.

[0040] The leakage prevention structure 10 shown in FIGS. 3 to 8 is for the rail R R ,R L and the wheel W R ,W L and prevents the leakage of the ejectant M1 from the housing portion 6R that houses the ejectant M1 ejected between them. The leakage prevention structure 10 reduces the ejection amount of the ejectant M1 leaking from the ejection device 1 when the ejection device 1 is not operating. The leakage prevention structure 10 prevents the ejectant M1 from leaking from the ejection device 1 due to the vibration generated when the railway vehicle travels on the track R. The leakage prevention structure 10 includes a suction pipe portion 11 and the like shown in FIGS. 3 to 8.

[0041] The suction pipe portion 11 shown in FIGS. 3 to 8 is a portion that sucks the ejectant M1 within the housing portion 6R. As shown in FIGS. 3 and 7, the suction pipe portion 11 guides the ejectant M1 from below the housing portion 6R, through above the housing portion 6R, to a mixing portion 7 where the ejectant M1 and the compressed gas G are mixed below the housing portion 6R. The suction pipe portion 11 is a cylindrical member of a predetermined length and has an outer appearance of a substantially inverted U-shaped pipe (suction pipe). As shown in FIGS. 3 to 5, 7, and 8, a part of the suction pipe portion 11 is piped inside the vent pipe portion 9. As shown in FIG. 8, when the suction pipe portion 11 is piped inside the vent pipe portion 9, a gap portion is formed between the outer peripheral portion of the suction pipe portion 11 and the inner peripheral portion of the vent pipe portion 9 so that gas can pass through the inside of the vent pipe portion 9, and thus the outer diameter of the suction pipe portion 11 is set to be smaller than the inner diameter of the vent pipe portion 9. The suction pipe portion 11 is, for example, a hose made of synthetic rubber such as nitrile rubber (NBR) that is excellent in wear resistance against frictional contact when the ejectant M1 passes through the inside of the suction pipe portion 11 and is easy to replace. As shown in FIGS. 6 and 8, the suction pipe portion 11 has a circular cross-section (for example, an inner diameter of about 3 mm). When the injection device 1 is not performing an injection operation, the suction pipe portion 11 is positioned above the surface S of the ejectant M1 within the housing portion 6R as shown in FIGS. 3 and 7 so that the ejectant M1 within the housing portion 6R does not leak due to vibrations of the vehicle or the like. Here, the surface S is the uppermost surface of the ejectant M1 deposited within the housing portion 6R. The suction pipe portion 11 includes a straight pipe portion 11a, a suction port 11b, a bent pipe portion 11c, a straight pipe portion 11d, a discharge port 11e shown in FIGS. 7 and 8, and the like. By piping the suction pipe portion 11 in a substantially inverted U shape, the distance from the suction port 11b to the discharge port 11e is made relatively long to prevent the ejectant M1 within the housing portion 6R from leaking into the mixing chamber 7g.

[0042] The straight pipe portion 11a shown in FIG. 7 is a flow path extending vertically within the housing portion 6R. The straight pipe portion 11a is linearly piped such that when the injection device 1 performs an injection operation, the injection material M1 within the housing portion 6R flows from below to above through this straight pipe portion 11a, and functions as a rising pipe for raising the injection material M1. The suction port 11b is a portion that sucks the injection material M1 into the suction pipe portion 11. The suction port 11b is an opening on the upstream side of the suction pipe portion 11 and is the lower end portion of the suction pipe portion 11 that opens within the housing portion 6R. The suction port 11b is located in the vicinity of the bottom portion 6e and below the mixing portion 7, with a slight gap between it and the bottom portion 6e of the housing portion 6R so as to consume as much as possible the injection material M1 present at the bottom portion 6e of the housing portion 6R.

[0043] The bent pipe portion 11c is a portion that changes the flow direction of the injection material M1. The bent pipe portion 11c changes the flow direction of the injection material M1 by 180° such that the injection material M1 flowing from below to above flows from above to below, and functions as a direction-changing pipe for changing the flow direction of the injection material M1. The bent pipe portion 11c is located higher than the surface S of the injection material M1 and is curved and piped at the uppermost part of the suction pipe portion 11.

[0044] The straight pipe section 11d is a flow path that extends vertically within the ventilation pipe section 9. The straight pipe section 11d is linearly piped such that when the injection device 1 performs an injection operation, the injection material M1 in the accommodation section 6R flows from above to below this straight pipe section 11d, and functions as a downward pipe for lowering the injection material M1. The straight pipe section 11d is arranged in parallel with the straight pipe section 11a at a predetermined interval. As shown in Fig. 8(A), the straight pipe section 11d is arranged such that the center line L2 of this straight pipe section 11d is parallel to the center line L1 of the ventilation pipe section 9, and the center line L2 of this straight pipe section 11d is arranged to be orthogonal to the center line L3 of the movable throttle section 8. As shown in Fig. 8(C), the outer peripheral surface of the straight pipe section 11d is in contact with the inner peripheral surface of the ventilation pipe section 9, and the outer peripheral surface of this straight pipe section 11d is fixed to the inner peripheral surface of the ventilation pipe section 9 with an adhesive or the like. As shown in Fig. 8(A), the lower end portion of the straight pipe section 11d protrudes into the mixing chamber 7g. The discharge port 11e shown in Fig. 7 is a portion for discharging the injection material M1 from within the suction pipe section 11. The discharge port 11e is an opening on the downstream side of the suction pipe section 11, is formed at the lower end portion of the suction pipe section 11, and opens within the mixing chamber 7g of the mixing section 7.

[0045] As shown in Figs. 8(A) and 8(C), the suction pipe section 11 is piped inside the ventilation pipe section 9 with the center line L2 of this suction pipe section 11 shifted to the upstream side of the mixing section 7 from the center line L1 of the ventilation pipe section 9. For example, the outer peripheral surface of the straight pipe section 11d is fixed to the inner peripheral surface of the ventilation pipe section 9 with an adhesive or the like, or fixed to the ventilation pipe section 9 with a fixing metal fitting or the like such that the outer peripheral surface of the straight pipe section 11d is in contact with the inner peripheral surface of the ventilation pipe section 9. As shown in Fig. 8(A), the downstream end portion of the suction pipe section 11 protrudes into the mixing chamber 7g of the mixing section 7 by a protrusion amount Δ. The protrusion amount Δ of the discharge port 11e of the suction pipe section 11 is set within a predetermined range (for example, the protrusion amount Δ = 0 to 1 mm) from the center line L3 of the injection port 8c that injects the compressed gas G into the mixing chamber 7g.

[0046] The flow paths 12R and 12L shown in Figs. 1 and 2 are pipelines through which the mixture M2 flows. The flow paths 12R and 12L are rails R R ,R Land the wheel W R ,W L In order to supply the mixture M2 between them, the mixture M2 is sent from the storage portions 6R and 6L toward the injection portions 13R and 13L. The flow paths 12R and 12L have their upstream sides connected to the mixture discharge portions 7i of the storage portions 6R and 6L shown in FIGS. 3, 5, and 7, and their downstream sides connected to the injection portions 13R and 13L shown in FIGS. 1 and 2.

[0047] The injection portions 13R and 13L shown in FIGS. 1 and 2 are portions for injecting the mixture M2. The injection portion 13R injects the mixture M2 R between the wheel W R and the rail R, and the injection portion 13L injects the mixture M2 between the wheel W L and the rail R L . The injection portions 13R and 13L are injection nozzles or the like that inject the mixture M2 toward the contact point P shown in FIG. 2.

[0048] The control device 14 shown in FIGS. 1 and 2 is a device that controls the operation of the injection device 1. The control device 14 outputs an opening / closing signal for opening and closing the opening / closing portions 4R and 4L when, for example, a wheel spin detection signal output from a wheel spin detection device that detects a macroscopic slip between the rail R R ,R L and the wheel W R ,W L is input, or when a very-brake operation detection signal output from a very-brake operation detection device that detects the operation of the very-brake device is input. The control device 14 adjusts the injection speed of the compressed gas G by the gas injection portion 2 according to each injection mode when, for example, an injection mode signal for switching to a low-speed injection mode in which the injection object M1 is injected at a low speed (low pressure) during low-speed running of the vehicle, a medium-speed injection mode in which the injection object M1 is injected at a medium speed (medium pressure) during medium-speed running of the vehicle, or a high-speed injection mode in which the injection object M1 is injected at a high speed (high pressure) during high-speed running of the vehicle is input.

[0049] Next, the operation of the leakage prevention structure of the injection device according to the embodiment of the present invention will be described. The rail R shown in FIGS. 1 and 2 R ,RL and the wheel W R ,W L When wheel spin occurring between them or the operation of the emergency brake device is detected, the control device 14 operates the opening / closing parts 4R, 4L, and the control device 14 varies the injection speed of the gas injection part 2 in accordance with the injection mode signal to supply the compressed gas G. As a result, the compressed gas G flows from the gas injection part 2 through the flow paths 3, 5R, 5L into the compressed gas supply part 7a of the mixing part 7 shown in FIG. 3. As shown in FIG. 4, when the compressed gas G flows from the compressed gas supply part 7a through the compressed gas passage part 7b into the movable part 8b of the movable throttle part 8, the compressed gas G with reduced pressure is ejected from the ejection port 8c at high speed.

[0050] As shown in FIG. 4, when the compressed gas G passes near the discharge port 11e of the suction pipe part 11, the pressure near the discharge port 11e decreases. At this time, the compressed gas G ejected from the ejection port 8c shown in FIG. 7 flows from the lower end opening part 9a to the upper end opening part 9b of the ventilation pipe part 9, the compressed gas G flows into the accommodation part 6R, and the pressure in the accommodation part 6R rises. For this reason, the pressure difference between the inside of the mixing chamber 7g and the inside of the accommodation part 6R disappears, and the ejectant M1 in the accommodation part 6R is sucked from the suction port 11b of the suction pipe part 11 as shown in FIG. 3. As a result, the ejectant M1 rises in the straight pipe part 11a shown in FIG. 7, the direction of the ejectant M1 changes in the curved pipe part 11c, the ejectant M1 descends in the straight pipe part 11d, and the ejectant M1 is discharged from the discharge port 11e into the mixing chamber 7g as shown in FIGS. 3 and 4.

[0051] As shown in FIG. 9(B), when the suction pipe part 11 is piped so as to be shifted to the downstream side of the mixing part 7 with respect to the ventilation pipe part 9, when the compressed gas G is ejected from the ejection port 8c and passes near the lower end opening part 9a of the ventilation pipe part 9, the pressure near the lower end opening part 9a of the ventilation pipe part 9 decreases. At this time, the compressed gas G ejected from the ejection port 8c flows into the suction pipe part 11 from the discharge port 11e and flows into the accommodation part 6R from the suction port 11b of the suction pipe part 11. As a result, since the ejectant M1 in the accommodation part 6R cannot be sucked into the mixing part 7, the ejectant M1 and the compressed gas G cannot be mixed and the mixture M2 cannot be ejected.

[0052] On the one hand, as shown in Fig. 9(A), when the suction pipe portion 11 is piped so as to be shifted upstream of the mixing portion 7 with respect to the ventilation pipe portion 9, when the compressed gas G is jetted from the jet port 8c and passes near the discharge port 11e of the suction pipe portion 11, the pressure near the discharge port 11e decreases. At this time, the compressed gas G jetted from the jet port 8c flows in from the lower end opening portion 9a of the ventilation pipe portion 9 and flows into the housing portion 6R from the upper end opening portion 9b of the ventilation pipe portion 9. As a result, the pressure in the housing portion 6R rises, and the ejectant M1 in the housing portion 6R can be sucked from the suction port 11b, and the ejectant M1 is discharged into the mixing chamber 7g from the discharge port 11e, and the ejectant M1 and the compressed gas G can be mixed to eject the mixture M2.

[0053] When the distance d shown in Figs. 8(A) and (B) is short, the amount of pressure drop of the compressed gas G jetted from the jet port 8c becomes large, and the amount of suction of the ejectant M1 sucked by the suction pipe portion 11 increases. On the other hand, when the distance d is long, the amount of pressure drop of the compressed gas G jetted from the jet port 8c becomes small, and the amount of suction of the ejectant M1 sucked by the suction pipe portion 11 decreases.

[0054] When the jet of the compressed gas G from the jet port 8c shown in Fig. 4 stops, the pressure near the discharge port 11e returns to the normal pressure (atmospheric pressure). As a result, the compressed gas G flows into the housing portion 6R shown in Fig. 3, and the gas in the housing portion 6R whose pressure has risen flows from the upper end opening portion 9b of the ventilation pipe portion 9 toward the lower end opening portion 9a, and the surplus gas in the housing portion 6R is instantaneously discharged from the housing portion 6R, and the pressure in the housing portion 6R returns to the normal pressure (atmospheric pressure). As a result, even though the jet operation of the jet device 1 has stopped, the ejectant M1 in the housing portion 6R is prevented from leaking out from the discharge port 11e through the suction pipe portion 11.

[0055] As shown in Figs. 3 and 4, when the ejectant M1 and the compressed gas G are mixed in the mixing chamber 7g and the mixture M2 is discharged from the mixture discharge portion 7i, the mixture M2 is jetted from the jet portions 13R and 13L through the flow paths 12R and 12L shown in Figs. 1 and 2 to the rail R R ,R L and the wheel W R ,W L and between them. As a result, the rail R R,R L and the wheel W R ,W L The coefficient of adhesion between them and the projectile M1 increases, preventing wheel spin and improving braking performance.

[0056] As shown in FIGS. 1 and 2, when a railway vehicle travels on the track R, the bogie of this railway vehicle vibrates, and the housing 6R mounted on this bogie also vibrates. As shown in FIG. 7, when the projectile M1 is stored in the housing 6R up to a specified capacity limit, the curved pipe portion 11c, which is the uppermost part of the suction pipe portion 11, is always positioned above the surface S of this projectile M1. For this reason, even when the housing 6R vibrates, it is prevented that the projectile M1 remaining in the straight pipe portion 11a of the suction pipe portion 11 or the projectile M1 that has entered from the suction port 11b flows into the straight pipe portion 11d beyond the curved pipe portion 11c. As a result, even though the injection device 1 is not performing an injection operation, it is prevented that the projectile M1 leaks out of the housing 6R due to vibrations of the bogie or the like.

[0057] FIG. 10 is a graph showing, as an example, the relationship between the position of the injection port 8c of the variable throttle portion 8 and the injection amount when the protrusion amount Δ shown in FIG. 8(A) is 0 mm. The vertical axis shown in FIG. 10 is the injection amount (g / 30 sec), which is the average injection amount of the projectile M1 per unit time (30 seconds). The horizontal axis is the number of rotations of the movable throttle return (rotation), which is the number of rotations when the movable portion 8b is rotated around the center line from the number of rotations 0 of the movable portion 8b when the injection port 8c is at the position closest to the discharge port 11e to the number of rotations 20 when the injection port 8c is at the position farthest from the discharge port 11e. As shown in FIG. 10, by rotating the movable portion 8b of the variable throttle portion 8, the injection amount of the projectile M1 can be adjusted. For example, it is possible to inject the projectile M1 in the normal use range within the range of the injection amount 10 to 50 (g / sec30) in the basic specifications of the injection device 1.

[0058] FIG. 11 is a graph showing, as an example, the change in the injection amount of the injection object M1 when the position of the injection port of the variable throttle part is changed while the position of the discharge port of the suction pipe part is changed in the vertical direction, and the injection object M1 is injected at medium or low speed. The vertical axis shown in FIG. 11 is the injection amount (g / 30 sec), and the horizontal axis is the movable throttle position (rotation return). The protrusion amount Δ is changed within the range of -3 to 3 mm, with + when the discharge port 11e of the suction pipe part 11 is located above and - when it is located below, with the center (0 mm) of the injection port 8c of the variable throttle part 8 shown in FIG. 8(A).

[0059] In the medium-speed injection mode shown in FIG. 11(A), it is set within the range of the protrusion amount Δ = -1 to 0 mm of the discharge port 11e of the suction pipe part 11 below the center line L3 of the injection port 8c of the movable throttle part 8 shown in FIG. 8(A). As a result, by adjusting the rotation speed of the movable throttle part 8 and adjusting the distance d, the injection amount of the injection object M1 can be set to the basic specifications of the injection device under the conditions of medium-speed injection of about 300 (kPa). Also, in the low-speed injection mode shown in FIG. 11(B), it is set within the range of the protrusion amount of -1 mm to 0 mm of the discharge port 11e of the suction pipe part 11 in the same manner as in the medium-speed injection mode. As a result, by adjusting the rotation speed of the movable throttle part 8 and adjusting the distance d so that the distance d becomes smaller than in the medium-speed injection mode, the injection amount of the injection object M1 can be set to the basic specifications of the injection device even under the conditions of constant-speed injection of about 100 (kPa).

[0060] The protrusion amount Δ of the discharge port 11e was changed within the range of -3 to 3 mm, and compressed air was injected as the compressed gas G at a flow rate of 147 (NL / min), and alumina was injected as the injection object M1. As a result, when the protrusion amount of the discharge port 11e was -1 mm, it was the maximum value of the injection amount of alumina of 55.0 (g / 30 sec), and when the protrusion amount of the discharge port 11e was 0 mm, the injection amount of alumina was 47.1 (g / 30 sec). By setting it within the range of the protrusion amount Δ = -1 to 0 mm and setting the movable throttle position within the range of 0 to 20 rotations, it was confirmed that it can be adjusted within the range of the injection amount of 10 to 50 (g / 30 sec) in the basic specifications regardless of the injection speed (within the dark-colored range shown in FIG. 11).

Example

[0061] Vibration tests were conducted on the countermeasure product and the conventional product to confirm the leakage prevention effect of the countermeasure product. Here, the countermeasure product is the injection device 1 equipped with the leakage prevention structure 10 shown in FIGS. 3 to 8. The conventional product is the conventional injection device 101 shown in FIGS. 12 and 13 that does not have the leakage prevention structure 10. The vibration test was performed using a vibration testing machine (manufactured by EMIC Co., Ltd., model: F-40000BDH / LA-TS) of the Railway Technical Research Institute, Incorporated Administrative Agency.

[0062] (Confirmation of Leakage by Vibration Test)

[0063] [Table 1]

[0064] Table 1 is a table showing the leakage confirmation results for each test condition of the countermeasure product and the conventional product. Here, "φ2.2 special" of the countermeasure product shown in Table 1 has a structure in which the nozzle portion of the variable throttle of the conventional product is lengthened. "Inlet" and "Outlet" mean the inlet side and the outlet side of the compressed air with reference to the suction hole 107f shown in FIG. 4. "Inlet" is the amount of alumina leakage upstream of the movable throttle portion 8 shown in FIG. 4. "Outlet" is the amount of alumina leakage downstream of the movable throttle portion 8 shown in FIG. 7. Vibration was applied to the countermeasure product under the condition where alumina leaked from the conventional product to confirm the effectiveness of the leakage prevention measure by the countermeasure product. As shown in Table 1, when 3.0 (kg) and 2.0 (kg) of alumina were contained in the tanks of the countermeasure product and the conventional product, the tank was vibrated under the vibration conditions of an acceleration effective value (Root Mean Square (RMS)) of 2 (G) and a frequency of 10 (Hz) in the vertical vibration direction (Z-axis direction (up and down direction) shown in FIG. 3). When 3.0 (kg) of alumina was contained, it was vibrated for 10 minutes, and when 2.0 (kg) of alumina was contained, it was vibrated for 20 minutes, and the amount of alumina leakage (g) from the tank was measured. As a result, alumina leakage from the tank was confirmed for the conventional product, but no alumina leakage from the tank was confirmed for the countermeasure product.

[0065] (Confirmation of Variation in Injection Volume by Vibration Test)

[0066]

Table 2

[0067] Table 2 is a table showing the changes in injection volume before, during, and after vibration of the countermeasure product. Here, "the first time before vibration" and "the second time before vibration" shown in Table 2 are the injection volumes when alumina is injected one or two times before vibrating the tank. "The first time after vibration", "the second time after vibration", and "the third time before vibration" are the injection volumes when alumina is injected one, two, or three times after vibrating the tank. "During vibration" is the injection volume when alumina is injected while the tank is being vibrated. Regarding the case where 2.0 (kg) or 3.0 (kg) of alumina is contained in the tank of the countermeasure product, the tank was vibrated by a vibration testing machine under the vibration conditions of an effective acceleration value of 2 (G) in the Z-axis direction and a frequency of 10 (Hz) to confirm whether the injection volume changes before, during, and after vibration. When the change in injection volume due to vibration was confirmed at an injection pressure of compressed air of 300 (kPa) and a return rotation speed of the movable throttle of 7, it was confirmed that although the injection volume increased by several grams during and after vibration compared to the injection volume before vibration, stable injection was possible even when injecting during and after vibration.

[0068] (Confirmation of Durability by Vibration Test)

[0069]

Table 3

[0070] Table 3 is a graph showing the durability confirmation results for each vibration direction of the countermeasure product. The durability was confirmed by vibrating the tank according to the "JIS E4031:2013 Railway vehicle supplies - Vibration and shock test methods Classification 2. Vibration durability test standard for products attached to the bogie frame" using a vibration testing machine. First, with the alumina in the tank emptied, vibration was applied in the horizontal vibration directions (X-axis direction (front-back direction) and Y-axis direction (left-right direction) shown in Figure 3) and the Z-axis direction. Here, the X-axis direction is the condition where the front of the tank is the rocking direction. For the X-axis direction, the effective acceleration value was 1.4 (G), for the Y-axis direction, the effective acceleration value was 2.7 (G), and for the Z-axis direction, the effective acceleration value was 3.1 (G). In all cases, the vibration was applied under the vibration conditions of a frequency of 5 - 250 (Hz) and a vibration time of 300 (minutes). As a result, although a metallic contact sound was rarely heard during vibration in the X-axis and Y-axis directions, no problems with durability were confirmed. Next, with 1 (kg) of alumina contained in the tank (a state of about 1 / 3 of the tank capacity), vibration was applied under the vibration conditions of an effective acceleration value of 1.4 (G) in the X-axis direction, a frequency of 5 - 250 (Hz), and a vibration time of 5 (minutes). As a result, the metallic contact sound was no longer confirmed. Also, in the commercial line where the natural leakage phenomenon occurs in the conventional product, when using a commercial vehicle and checking the amount of the adhesion increasing material multiple times until it travels about 35,000 km, no leakage of the adhesion increasing material was confirmed.

[0071] The leakage prevention structure of the injection device and the injection device according to the embodiment of the present invention have the following effects as described below. (1) In this embodiment, the suction pipe portion 11 sucks the injection object M1 in the storage portion 6R, and guides the injection object M1 from below the storage portion 6R to above the storage portion 6R and then to the mixing portion 7 where the injection object M1 and the compressed gas G are mixed below the storage portion 6R. For this reason, after the injection object M1 once rises to above the storage portion 6R, it is necessary for the injection object M1 to descend to the mixing portion 7, and the distance that the injection object M1 moves from within the storage portion 6R to within the mixing portion 7 can be lengthened. As a result, even when the injection device 1 is not performing an injection operation, it is possible to prevent the injection object M1 from leaking from within the storage portion 6R into the mixing portion 7 due to vibrations of the vehicle or the like.

[0072] (2) In this embodiment, the ventilation pipe portion 9 connects the inside of the housing portion 6R and the mixing portion 7, and a part of the suction pipe portion 11 is piped inside the ventilation pipe portion 9. Therefore, by utilizing the internal space of the ventilation pipe portion 9, the suction pipe portion 11 can be easily piped into the ventilation pipe portion 9 through the suction pipe portion 11. Also, the suction pipe portion 11 can be easily fixed to the ventilation pipe portion 9 by utilizing the existing ventilation pipe portion 9. As a result, without largely modifying the basic structure of the conventional injection device 101, a suction pipe portion 11 with an inexpensive and simple structure can be additionally installed, and the injection device 1 can be modified at low cost while maintaining a structure that is easy to maintain for the conventional injection device 101. Furthermore, a plurality of types of suction pipe portions 11 with different inner diameters can be prepared, and the suction pipe portion 11 with the optimal inner diameter can be selected and used according to the size of the injection object M1.

[0073] (3) In this embodiment, the center line L2 of the suction pipe portion 11 is shifted to the upstream side of the mixing portion 7 from the center line L1 of the ventilation pipe portion 9, and the suction pipe portion 11 is piped inside the ventilation pipe portion 9. Therefore, the injection object M1 can be surely sucked from the inside of the housing portion 6R into the mixing portion 7 through the suction pipe portion 11, and the gas can be surely circulated between the inside of the housing portion 6R and the inside of the mixing portion 7 through the ventilation pipe portion 9.

[0074] (4) In this embodiment, the distance d between the center line L3 of the injection port 8c for injecting the compressed gas G in the mixing portion 7 and the discharge port 11e of the suction pipe portion 11 is within a predetermined range. Therefore, by setting the distance d to an ideal value, the injection device 1 can be set so that injection conditions such as the injection amount of the injection device 1 satisfy the basic specifications.

[0075] (5) In this embodiment, the uppermost part of the suction pipe portion 11 is located above the surface of the ejectant M1 in the accommodation portion 6R. For this reason, the ejectant M1 can be passed through the suction pipe portion 11 only when the injection device 1 is performing an injection operation, above the uppermost surface of the ejectant M1 accommodated in a so-called full state in the accommodation portion 6R. As a result, it is possible to prevent the ejectant M1 in the suction pipe portion 11 from leaking beyond the uppermost surface of the ejectant M1 deposited in the accommodation portion 6R due to vibrations of the vehicle or the like when the injection device 1 is not performing an injection operation.

[0076] (6) In this embodiment, the injection device 1 is provided with a leakage prevention structure 10. For this reason, the leakage prevention structure 10 can be easily added at low cost by using the existing structure without significantly modifying the structure of the conventional injection device 101, and it is possible to prevent the ejectant M1 from leaking when the injection operation is not being performed. Further, the injection device 1 can be provided as a new product at low cost with the leakage prevention structure 10 incorporated in advance.

[0077] The present invention is not limited to the embodiments described above, and various modifications or changes are possible as described below, and these are also within the scope of the present invention. (1) In this embodiment, the rail R R ,R L and the wheel W R ,W L has been described by taking as an example the case where an adhesion improving material for improving the adhesion coefficient between them is injected as the ejectant M1, but the present invention can also be applied to the case where a friction reducing material for relaxing the friction coefficient between them is injected as the ejectant M1, or the case where an ejectant other than the adhesion improving material or the friction reducing material is injected. Further, in this embodiment, the case where the ejectant M1 is alumina has been described by way of example, but the present invention can also be applied to the ejectant M1 such as ceramic particles other than alumina or silica sand.

[0078] (2) In this embodiment, the case where the projectile M1 is a granular material has been described as an example. However, the present invention can also be applied to the case where the projectile is a powder or a liquid material. Further, in this embodiment, the case where compressed air is injected as the compressed gas G has been described as an example. However, the present invention can also be applied to the case where a gas other than compressed air is injected. Furthermore, in this embodiment, the case where the injection device 1 is an on-vehicle injection device that injects the projectile M1 from the side of the railway vehicle has been described as an example. However, the present invention can also be applied to the case where the injection device 1 is a ground injection device that injects the projectile M1 from the side of the track R. In this case, it is possible to prevent the projectile M1 from leaking from the accommodating portions 6R and 6L that are vibrated by the running of the railway vehicle.

[0079] (3) In this embodiment, the case where the suction pipe portion 11 is made of synthetic rubber has been described as an example. However, the present invention can also be applied to the case where a part or all of the suction pipe portion 11 is made of metal or synthetic resin. For example, the entire suction pipe portion 11 can be made of metal such as stainless steel, or the straight pipe portion 11a or the curved pipe portion 11c of the suction pipe portion 11 can be made of metal such as stainless steel, or the straight pipe portion 11d can be made of synthetic rubber such as nitrile rubber. In this case, the metal part of the suction pipe portion 11 can be fixed to the ventilation pipe portion 9 by brazing or the like. Further, in this embodiment, the movable throttle portion 8 can be screwed and attached to the compressed gas passage portion 7b in the same manner as the conventional movable throttle portion 108, and the movable throttle portion 8 having a long length up to the injection port 8c has been described as an example. However, the present invention is not limited to such a structure. For example, a female screw portion formed on the inner peripheral portion of the compressed gas passage portion 7b can be formed up to the vicinity of the discharge port 11e, and the conventional movable throttle portion 108 having a short length up to the injection port can be attached to the compressed gas passage portion 7b.

Explanation of reference numerals

[0080] 1 Injection device 2 Gas injection portion 6R,6L Accommodating portion 6g Discharge port 6h Closing portion 7 Mixing portion 7a Compressed gas supply section 7b Compressed gas passage section 7c Adjustment hole 7d, 7e Plugging section 7f Vent pipe connection section 7g Mixing chamber 7h Mixture passage section 7i Mixture discharge section 8 Movable throttle section 8a Fixed section 8b Movable section 8c Injection port 9 Vent pipe section 9a Lower end opening 9b Upper end opening 10 Leakage prevention structure 11 Suction pipe section 11a Straight pipe section 11b Suction port 11c Curved pipe section (topmost part) 11d Straight pipe section (part of the suction pipe section) 11e Discharge port 13R, 13L Injection section R track R R ,R L rail W R ,W L wheel G Compressed gas M1 Injection substance M2 Mixture S Surface d Distance L1 Center line of the vent pipe section L2 Center line of the suction pipe section (center line of the straight pipe section) L3 Center line of the movable throttle section (center line of the injection port) Δ Protrusion amount

Claims

1. A leakage prevention structure for an injection device that prevents leakage of an injection material from a storage portion of the injection device that stores the injection material to be injected between a rail and a wheel, comprising a suction pipe portion that sucks the injection material within the storage portion, wherein the suction pipe portion guides the injection material from below the storage portion, through above the storage portion, to a mixing portion that mixes the injection material and a compressed gas below the storage portion, and a part of the suction pipe portion is piped inside a ventilation pipe portion that connects the inside of the storage portion and the inside of the mixing portion, characterizing the leakage prevention structure of the injection device.

2. In the leakage prevention structure of the injection device according to Claim 1, the suction pipe portion is piped inside the ventilation pipe portion with the center line of the suction pipe portion shifted to the upstream side of the mixing portion from the center line of the ventilation pipe portion. characterizing the leakage prevention structure of the injection device.

3. In the leakage prevention structure of the injection device according to Claim 1 or Claim 2, the distance between the center line of the injection port that injects the compressed gas in the mixing portion and the discharge port of the suction pipe portion is within a predetermined range. characterizing the leakage prevention structure of the injection device.

4. In the leakage prevention structure of the injection device according to any one of Claims 1 to 3, the uppermost part of the suction pipe portion is positioned above the surface of the injection material within the storage portion. characterizing the leakage prevention structure of the injection device.

5. An injection device that injects an injection material between a rail and a wheel, comprising the leakage prevention structure of the injection device according to any one of Claims 1 to 4. characterizing the injection device.

Images