Railway sleeper embedded sleeve and manufacturing method thereof

Abstract

The invention relates to the technical field of railway fasteners, in particular to a railway sleeper embedded sleeve and a manufacturing method thereof, and the embedded sleeve comprises a sleeve seat and a plurality of sleeve bodies arranged on the sleeve seat; the method comprises the following steps: mounting a strip-shaped insert between two adjacent sleeve body half cavities in a fixed mold; the fixed mold and the movable mold are closed, so that the two corresponding sleeve body half cavities in the fixed mold and the movable mold are combined into injection molding cavities, and each insert is fixed between the two adjacent injection molding cavities in a suspended state; the bottom of the ejector rod is inserted into the injection molding cavity and abuts against the bottom of the injection molding cavity; a molten plastic material is injected through a hot runner nozzle located below the injection molding cavity, and the area from the upper portion of a hot runner hole to the lower portion of the ejector rod is filled with the plastic material; and the plastic material is cooled, and the pre-embedded sleeve is obtained after the fixed mold and the movable mold are dismounted. According to the method, the overall uniform shrinkage can be ensured, and the pre-embedded sleeve with small wall thickness difference, consistent shrinkage deformation and small dimensional deviation is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of railway fasteners, and particularly relates to a pre-embedded sleeve for railway sleepers and a manufacturing method thereof. Background Art

[0002] With the development of the railway industry, current railway projects need to face construction difficulties such as mountains, terrain height differences, frequent earthquakes, complex geology, seasonal frozen soil, mountain disasters, high altitude hypoxia, and ecological environmental protection. Railway sleepers, as key structures under the rails, are responsible for fixing the positions of the rails and bearing the heavy pressure of trains. The pre-embedded sleeves in railway fasteners are pre-embedded in the sleepers, which can enhance the connection stability between the sleepers and turnouts or other railway components.

[0003] During the preparation process of the pre-embedded sleeve, the large difference in the wall thickness dimensions and inconsistent shrinkage deformation of the pre-embedded sleeve will directly affect the mechanical properties of the sleeper and the long-term stability of the track system. For example, it may lead to uneven distribution of bolt anchoring force, easy loosening of the fasteners, causing geometric parameters such as rail gauge and level of the rails to exceed the limit, and triggering the risk of train rocking or derailment; or, the sleeves with uneven wall thickness form weak points inside the sleeper, and are prone to crack when bearing the dynamic load of the train for a long time, and even cause local fracture of the sleeper.

[0004] Therefore, on the basis of the existing pre-embedded sleeves formed by injection molding, it is urgently necessary to provide a manufacturing method for railway sleeper pre-embedded sleeves to avoid the foregoing situations, so as to obtain pre-embedded sleeves with small wall thickness differences, consistent shrinkage deformation, and small dimensional deviations. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pre-embedded sleeve for railway sleepers and a manufacturing method thereof.

[0006] To solve the above problems, the technical solutions adopted by the present invention are as follows: In the first aspect, a manufacturing method for a pre-embedded sleeve for railway sleepers is provided. The pre-embedded sleeve includes a sleeve base and a plurality of sleeve bodies arranged on the sleeve base; Step 1: Install long strip-shaped inserts between adjacent two sleeve body half-cavities in the fixed mold; Step 2: Close the fixed mold and the moving mold, so that the corresponding two sleeve body half-cavities in the fixed mold and the moving mold are combined into an injection molding cavity, and each insert is fixedly suspended between the adjacent two injection molding cavities; Step 3: Insert the bottom of the ejector rod into the injection molding cavity and abut against the bottom of the injection molding cavity; Step 4: Inject molten plastic material through a hot runner nozzle located below the injection molding cavity, and use the plastic material to fill the area above the hot runner hole and below the ejector rod; Step Five: Cool down the plastic material, and after removing the fixed mold and the moving mold, the embedded casing is obtained.

[0007] As an embodiment of the present invention, fixing holes are provided on both sides of the insert. The fixing holes are blind holes. Insert posts are provided on both the fixed mold and the moving mold. The fixing holes are for the insert posts to penetrate into.

[0008] As an embodiment of the present invention, the insert posts provided on the fixed mold and the moving mold both include a first type of insert post and a second type of insert post, and the length of the first type of insert post is greater than the length of the second type of insert post; The first type of insert post is for penetrating into the fixing hole, and after abutting against the fixing hole, the second type of insert post abuts against the corresponding side insert.

[0009] As an embodiment of the present invention, in the fixed mold, three insert posts are provided between two adjacent semi-cavities of the casing body. The three insert posts are vertically arranged along the symmetry line of the two semi-cavities of the casing body. The insert post at the uppermost position is the first type of insert post, and the remaining two insert posts are the second type of insert posts; One fixing hole is provided on the side of the insert close to the fixed mold. After the first type of insert post penetrates into the fixing hole, the remaining two second type of insert posts abut against the corresponding insert body.

[0010] As an embodiment of the present invention, in the moving mold, four insert posts are provided between two adjacent semi-cavities of the casing body, including: two horizontally arranged first type of insert posts and two vertically arranged second type of insert posts; After the fixed mold and the moving mold are clamped, the axes of the two first type of insert posts in the moving mold and the axis of the first type of insert post in the fixed mold are on the same horizontal line; the axes of the two second type of insert posts in the moving mold are respectively collinear with the axes of the corresponding two second type of insert posts in the fixed mold.

[0011] As an embodiment of the present invention, the insert includes an insert body and a fixing part. The insert body is wavy, and the fixing holes are provided on both end faces of the fixing part.

[0012] As an embodiment of the present invention, cooling channels are provided in both the fixed mold and the moving mold. In Step Five, the plastic material is cooled by injecting a cooling medium into the cooling channels.

[0013] As an embodiment of the present invention, the cooling channel includes a first coil pipe and a second coil pipe arranged in parallel, a third coil pipe located below the first coil pipe and the second coil pipe, and a fourth coil pipe located below the third coil pipe; The bottom of the fourth coil pipe is located below the injection mold cavity, and the tops of the first coil pipe and the second coil pipe are both located above the injection mold cavity.

[0014] Second, a railway sleeper embedded sleeve obtained by the method for manufacturing a railway sleeper embedded sleeve as described in the first aspect is provided.

[0015] The beneficial effects produced by adopting the above technical solutions are as follows: In the method for manufacturing a railway sleeper embedded sleeve provided by the embodiment of the present invention, by suspending an insert between injection mold cavities, the insert is positioned at the middle position of the thick glue position of the plastic material (that is, the position without an injection mold cavity). After injecting molten plastic material through a hot runner nozzle, the molten plastic material fills evenly and will cover the periphery of the insert; then, after cooling the molten plastic material, it can ensure uniform shrinkage as a whole, obtaining an embedded sleeve with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a railway sleeper embedded sleeve provided by an embodiment of the present invention.

[0017] Figure 2 is a schematic structural diagram of a fixed mold provided by an embodiment of the present invention.

[0018] Figure 3 is Figure 2 a schematic structural diagram after installing the insert.

[0019] Figure 4 is a schematic structural diagram of a moving mold provided by an embodiment of the present invention.

[0020] Figure 5 is a sectional view after installing the insert provided by an embodiment of the present invention.

[0021] Figure 6 is a schematic internal structural diagram after installing the ejector rod provided by an embodiment of the present invention.

[0022] Figure 7 is a schematic structural diagram of a mold for manufacturing a railway sleeper embedded sleeve provided by an embodiment of the present invention.

[0023] Figure 8 is an installation schematic diagram of a cooling channel provided by an embodiment of the present invention.

[0024] Figure 9 is a schematic structural diagram of a cooling channel provided by an embodiment of the present invention.

[0025] Figure 10It is a filling schematic diagram of the molten plastic material during the injection molding without adding inserts from 0.0000s to 0.5422s in the present invention.

[0026] Figure 11 It is a filling schematic diagram of the molten plastic material during the injection molding without adding inserts from 0.0000s to 1.521s in the present invention.

[0027] Figure 12 It is a filling schematic diagram of the molten plastic material during the injection molding without adding inserts from 0.0000s to 3.139s in the present invention.

[0028] Figure 13 It is a schematic diagram of the injection molding process of the molten plastic material during the injection molding with adding inserts from 0.0000s to 0.216s in the present invention.

[0029] Figure 14 It is a schematic diagram of the injection molding process of the molten plastic material during the injection molding with adding inserts from 0.0000s to 2.279s in the present invention.

[0030] Figure 15 It is a schematic diagram of the injection molding process of the molten plastic material during the injection molding with adding inserts from 0.0000s to 2.375s in the present invention.

[0031] Figure 16 It is a thermal effect diagram of the cooling process without adding inserts in the present invention.

[0032] Figure 17 It is a thermal effect diagram of the cooling process with adding inserts in the present invention.

[0033] Wherein: 100 embedded casing, 101 casing seat, 102 casing body; 1 fixed mold, 1-1 semi-cavity of the casing body, 2 insert, 2-1 fixing hole, 2-2 insert body, 2-3 fixing part, 3 moving mold, 3-1 insert post, 3-1-1 first type of insert post, 3-1-2 second type of insert post, 4 ejector rod, 5 hot runner hole, 6 hot runner nozzle, 7 cooling channel, 7-1 first coil, 7-2 second coil, 7-3 third coil, 7-4 fourth coil. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the present invention clearer, the following describes the invention clearly and completely in conjunction with specific embodiments.

[0035] Embodiment 1 The embodiment of the present invention provides a method for manufacturing an embedded casing for a railway sleeper, as Figure 1 shown, the embedded casing 100 includes a casing seat 101 and a plurality of casing bodies 102 arranged on the casing seat 101; The manufacturing method includes: Step 1: Install long strip-shaped inserts 2 between two adjacent sleeve body half-cavities 1-1 in the fixed mold 1; Step 2: Close the fixed mold 1 and the moving mold 3 so that the corresponding two sleeve body half-cavities 1-1 in the fixed mold 1 and the moving mold 3 are combined into an injection mold cavity, and each insert 2 is fixed in a suspended state between two adjacent injection mold cavities; Step 3: Insert the bottom of the ejector rod 4 into the injection mold cavity and abut against the bottom of the injection mold cavity; Step 4: Inject molten plastic material through the hot runner nozzle 6 located below the injection mold cavity, and use the plastic material to fill the area above the hot runner hole 5 and below the ejector rod 4; Step 5: Cool the plastic material, and remove the fixed mold 1 and the moving mold 3 to obtain the embedded sleeve 100.

[0036] In the method for manufacturing the railway sleeper embedded sleeve provided by the embodiment of the present invention, by suspending the insert 2 between the injection mold cavities, the insert 2 is positioned in the middle of the thick glue position of the plastic material, that is, the position without the injection mold cavity. After injecting the molten plastic material through the hot runner nozzle 6, the molten plastic material is filled more evenly and will cover the periphery of the insert 2; then, after cooling the molten plastic material, it can ensure overall uniform shrinkage, and obtain an embedded sleeve 100 with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation.

[0037] Embodiment 2 The embodiment of the present invention provides a method for manufacturing a railway sleeper embedded sleeve 100, as Figure 1 shown, the embedded sleeve 100 includes a sleeve base 101 and a plurality of sleeve bodies 102 arranged on the sleeve base 101; The manufacturing method includes: Step S1: Install long strip-shaped inserts 2 between two adjacent sleeve body half-cavities 1-1 in the fixed mold 1; In order to match the embedded sleeve 100, the fixed mold 1 is provided with sleeve body half-cavities 1-1 adapted to the number of sleeve bodies 102 on the embedded sleeve 100, which can be three, four, or any other required value. Exemplarily, the structure of the fixed mold 1 is as Figure 2 shown, and it is provided with three sleeve body half-cavities 1-1.

[0038] In this case, two long strip-shaped inserts 2 are provided, and their installation positions are as Figure 3 shown.

[0039] Step S2: Close the fixed mold 1 and the moving mold 3 so that the corresponding two sleeve body half-cavities 1-1 in the fixed mold 1 and the moving mold 3 are combined into an injection mold cavity, and each insert 2 is fixedly suspended between two adjacent injection mold cavities; As Figure 4 shown, the number of sleeve body half-cavities 1-1 on the moving mold 3 is adapted to that of the fixed mold 1. Thus, after the fixed mold 1 and the moving mold 3 are closed, the corresponding two sleeve body half-cavities 1-1 in the fixed mold 1 and the moving mold 3 can be combined into an injection mold cavity. When there are three sleeve body half-cavities 1-1 on the fixed mold 1, there are also three sleeve body half-cavities 1-1 on the moving mold 3.

[0040] Furthermore, in order to fixedly suspend all the inserts 2 after the moving mold 3 and the fixed mold 1 are combined, as Figure 5 shown, the present invention specifically describes the structures of the fixed mold 1, the moving mold 3, etc.

[0041] In a possible implementation manner, as Figures 2 - 4 shown, fixing holes 2-1 are provided on both sides of the insert 2. The fixing holes 2-1 are blind holes. Insert posts 3-1 are provided on both the fixed mold 1 and the moving mold 3, and the fixing holes 2-1 are used for the insert posts 3-1 to penetrate into. Of course, as Figure 3 shown, the insert 2 includes an insert body 2-2 and a fixing portion 2-3. The insert body 2-2 is wavy. Fixing holes 2-1 are provided on both end faces of the fixing portion 2-3. The wavy shape of the insert body 2-2 is adapted to the internal threads on the inner wall of the sleeve body half-cavity 1-1, which can further ensure the uniformity of the filling of the molten plastic material and reduce the non-uniform shrinkage to a greater extent.

[0042] In this case, the insert posts 3-1 provided on the fixed mold 1 and the moving mold 3 both include a first type of insert post 3-1-1 and a second type of insert post 3-1-2, and the length of the first type of insert post 3-1-1 is greater than that of the second type of insert post 3-1-2; The first type of insert post 3-1-1 is used to penetrate into the fixing hole 2-1, and after abutting against the fixing hole 2-1, the second type of insert post 3-1-2 abuts against the corresponding side of the insert body 2-2.

[0043] Furthermore, as Figure 3 shown, one fixing hole 2-1 is provided on the side of the insert 2 (specifically, the fixing portion 2-3) close to the fixed mold 1, and two fixing holes 2-1 are provided on the side close to the moving mold 3; In the fixed mold 1, three insert posts 3-1 are arranged between two adjacent sleeve body half-cavities 1-1. The three insert posts 3-1 are vertically arranged along the symmetry line of the two sleeve body half-cavities 1-1. The insert post 3-1 at the uppermost position is the first type of insert post 3-1-1, and the remaining two insert posts 3-1 are the second type of insert post 3-1-2.

[0044] In the moving mold 3, four insert posts 3-1 are arranged between two adjacent sleeve body half-cavities 1-1, which include: two horizontally arranged first type of insert posts 3-1-1 and two vertically arranged second type of insert posts 3-1-2; After the fixed mold 1 and the moving mold 3 are clamped, the axes of the two first type of insert posts 3-1-1 in the moving mold 3 and the axis of the first type of insert post 3-1-1 in the fixed mold 1 are on the same horizontal line; the axes of the two second type of insert posts 3-1-2 in the moving mold 3 are respectively collinear with the axes of the corresponding two second type of insert posts 3-1-2 in the fixed mold 1; During installation, the fixing holes 2-1 on the insert 2 are inserted into the first type of insert posts 3-1-1 in the fixed mold 1, so that the remaining two second type of insert posts 3-1-2 are in contact with one side of the insert body 2-2; then, the fixed mold 1 and the moving mold 3 are clamped, so that the two horizontally arranged first type of insert posts 3-1-1 in the moving mold 3 are inserted into the two fixing holes 2-1 on the other side of the insert 2, and the remaining two vertically arranged second type of insert posts 3-1-2 are in contact with the other side of the insert body 2-2; of course, in order to ensure the balanced force on the insert 2, the sizes of all the first type of insert posts are the same, and the sizes of all the second type of insert posts are also the same.

[0045] In the embodiment of the present invention, by making the axes of the two first type of insert posts 3-1-1 in the moving mold 3 and the axis of the first type of insert post 3-1-1 in the fixed mold 1 on the same horizontal line, the deflection of the insert 2 can be prevented; by making the axes of the two second type of insert posts 3-1-2 in the moving mold 3 respectively collinear with the axes of the corresponding two second type of insert posts 3-1-2 in the fixed mold 1, the balanced force on the insert 2 can be ensured, thereby ensuring the uniformity of the filling of the molten plastic material.

[0046] The present invention does not specifically limit the forming method and size of the insert 2. Exemplarily, the insert 2 is a plastic part, obtained by injection molding, and the surface is rough. The size of the insert 2 is determined according to the size of the position where it is placed (between two adjacent sleeve body half-cavities 1-1), and it is made as large as possible under the condition that the insert 2 is not exposed. If the reserved glue (molten plastic material) amount is too small, the temperature of the melt glue will decrease when flowing through the insert, resulting in premature cooling and forming a lack of glue situation, which affects the overall performance of the embedded sleeve 100 product. If the reserved amount is too large, the overall shrinkage of the embedded sleeve 100 product will become larger, and the desired effect cannot be achieved.

[0047] In an embodiment of the present invention, when the diameter of the socket 101 in the embedded sleeve 100 is 45 cm, the axial distance between any two adjacent sockets 101 is 75 cm; the height of the cylindrical part is 39 cm, and the height of the threaded part is 96 cm; when the maximum thickness of the area between any two adjacent sleeve bodies 102 is 16 cm, the size of the insert 2 is 118×32×8 cm, and the distance between the insert 2 and the upper plane of the embedded sleeve 100 is 6 - 7 cm.

[0048] Step S3: Insert the bottom of the ejector rod 4 into the injection mold cavity and abut it against the bottom of the injection mold cavity. As Figure 6 shown, the size of the ejector rod is smaller than the size of the injection mold cavity. Step S4: Inject molten plastic material through the hot runner nozzle 6 located below the injection mold cavity, and use the plastic material to fill the area above the hot runner hole 5 and below the ejector rod 4 to obtain a complete manufacturing mold for the railway sleeper embedded sleeve, as Figure 7 shown.

[0049] Step S5: Cool down the plastic material, and remove the fixed mold 1 and the moving mold 3 to obtain the embedded sleeve 100.

[0050] Among them, as Figure 8 and Figure 9 shown, cooling channels 7 are provided in both the fixed mold 1 and the moving mold 3. In step S5, the plastic material is cooled by injecting a cooling medium (such as water) into the cooling channels 7; further, the cooling channel 7 includes a first coil 7-1 and a second coil 7-2 arranged in parallel, a third coil 7-3 located below the first coil 7-1 and the second coil 7-2, and a fourth coil 7-4 located below the third coil 7-3; The bottom of the fourth coil 7-4 is located below the injection mold cavity, and the tops of the first coil 7-1 and the second coil 7-2 are both located above the injection mold cavity.

[0051] In an embodiment of the present invention, according to the method of feeding the molten plastic material from the bottom, the fourth coil 7-4 and the third coil 7-3 are respectively arranged at the bottom, and the first coil 7-1 and the second coil 7-2 arranged side by side are arranged at the top to achieve zonal control of the cooling rate. During cooling, by adding a liquid at 60°C (for example: water) into these four coils, it can ensure overall uniform shrinkage, and obtain an embedded sleeve 100 with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation.

[0052] Effect example: Further, to verify that the present invention can achieve the effect of ensuring overall uniform shrinkage, the present invention respectively conducts an analysis and evaluation of the injection process and an analysis and evaluation of the shrinkage process deformation.

[0053] 1. Injection process analysis and evaluation The present invention conducts thermal effect imaging analysis on the filling process of injecting molten plastic material through the hot runner nozzle 6 provided in the hot runner hole 5 below the injection mold cavity before and after adding the insert. The image obtained without adding the insert is as shown in Figures 10 - 12 ; the image obtained after adding the insert is as shown in Figures 13 - 15 . It can be seen from the above figures that from the analysis of the product filling process, the filling process of the insert 2 is uniform.

[0054] 2. Shrinkage process deformation analysis and evaluation The present invention conducts thermal effect imaging analysis on the process of cooling the plastic material before and after adding the insert. The image obtained without adding the insert is as shown in Figure 16 ; the image obtained after adding the insert is as shown in Figure 17 . It can be seen from the above figures that the shrinkage value of the product with the insert 2 is half of the original, and there is an obvious effect.

[0055] Therefore, through the method for manufacturing the embedded sleeve of the railway sleeper provided by the present invention, it is possible to ensure uniform overall shrinkage, and thus obtain the embedded sleeve 100 with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for manufacturing a pre-buried casing for railway sleepers, characterized in that: The embedded sleeve (100) comprises a sleeve seat (101) and a plurality of sleeve bodies (102) arranged on the sleeve seat (101); Step 1: Installing a long strip insert (2) between two adjacent sleeve body half cavities (1-1) in the fixed mold (1); Step 2: Clamping the fixed mold (1) and the movable mold (3) together so that the two corresponding sleeve body half cavities (1-1) in the fixed mold (1) and the movable mold (3) are combined into an injection molding cavity, and each of the inserts (2) is fixed in a suspended state between two adjacent injection molding cavities; Step 3, inserting the bottom of the ejector rod (4) into the injection cavity and abutting against the bottom of the injection cavity; Step 4: injecting molten plastic material through a hot runner nozzle (6) disposed in a hot runner hole (5) below the injection cavity, so that the plastic material fills the area from above the hot runner hole (5) to below the ejector pin (4); Step five: cooling the plastic material, and removing the fixed mold (1) and the movable mold (3) to obtain the embedded sleeve (100).

2. A method for manufacturing a railway sleeper pre-embedded casing according to claim 1, characterized in that: Both sides of the insert (2) are provided with fixing holes (2-1), the fixing holes (2-1) are blind holes, and both the fixed mold (1) and the movable mold (3) are provided with inserting columns (3-1), the fixing holes (2-1) are used for the inserting columns (3-1) to penetrate.

3. A method for manufacturing a railway sleeper embedded casing according to claim 2, characterized in that: The embedded columns (3-1) arranged on the fixed mold (1) and the movable mold (3) both include first-type embedded columns (3-1-1) and second-type embedded columns (3-1-2), and the length of the first-type embedded columns (3-1-1) is greater than the length of the second-type embedded columns (3-1-2); The first type of embedded column (3-1-1) is used to penetrate into the fixing hole (2-1), and after abutting against the fixing hole (2-1), the second type of embedded column (3-1-2) is abutted against the corresponding side embedded component (2).

4. A method for manufacturing a railway sleeper pre-embedded casing according to claim 3, characterized in that: In the fixed mold (1), three inlay columns (3-1) are arranged between two adjacent sleeve body half cavities (1-1), and the three inlay columns (3-1) are arranged vertically along the symmetry line of the two sleeve body half cavities (1-1), the inlay column located at the top is a first type of inlay column (3-1-1), and the remaining two inlay columns are second type of inlay columns (3-1-2); A fixing hole (2-1) is provided on a side of the insert (2) close to the fixed mold (1); after the first type of insert column (3-1-1) passes through the fixing hole (2-1), the remaining two second type of insert columns (3-1-2) abut against the insert body (2-2).

5. A method for manufacturing a railway sleeper embedded casing according to claim 4, characterized in that: In the movable mold (3), four embedded columns (3-1) are arranged between two adjacent sleeve body half-cavities (1-1), comprising: two first-type embedded columns (3-1-1) arranged horizontally and two second-type embedded columns (3-1-2) arranged vertically; After the fixed mold (1) and the movable mold (3) are closed, the axes of the two first-type inlay columns (3-1-1) in the movable mold (3) and the first-type inlay columns (3-1-1) in the fixed mold (1) are on the same horizontal line; and the axes of the two second-type inlay columns (3-1-2) in the movable mold (3) are respectively on the same line with the axes of the corresponding two second-type inlay columns (3-1-2) in the fixed mold (1).

6. The method for manufacturing a railway sleeper embedded casing according to claim 2, characterized in that: The insert (2) comprises an insert body (2-2) and a fixing portion (2-3); the insert body (2-2) is wavy in shape, and the fixing holes (2-1) are provided on both end surfaces of the fixing portion (2-3).

7. The method for manufacturing a railway sleeper pre-embedded casing according to claim 1, characterized in that: The fixed mold (1) and the movable mold (3) are both provided with cooling channels (7), and in step five, cooling of the plastic material is achieved by injecting cooling medium into the cooling channels (7).

8. A method for manufacturing a railway sleeper pre-embedded casing according to claim 7, characterized in that: The cooling channel (7) comprises a first coil (7-1) and a second coil (7-2) arranged in parallel, a third coil (7-3) located below the first coil (7-1) and the second coil (7-2), and a fourth coil (7-4) located below the third coil (7-3); The bottom of the fourth coil (7-4) is located below the injection cavity, and the tops of the first coil (7-1) and the second coil (7-2) are both located above the injection cavity.

9. A railway sleeper embedded casing, characterized in that: The method is obtained by using a method for manufacturing a pre-embedded casing for railway sleepers as described in any one of claims 1 to 8.

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