A railway sleeper embedded sleeve and its manufacturing method

Abstract

The present invention relates to the technical field of railway fasteners, and particularly to a pre-embedded sleeve for railway sleepers and a manufacturing method thereof. The pre-embedded sleeve includes a sleeve base and a plurality of sleeve bodies arranged on the sleeve base; the method includes: installing strip-shaped inserts between adjacent two semi-cavities of the sleeve bodies in the fixed mold; closing the fixed mold and the movable mold so that the corresponding two semi-cavities of the sleeve bodies in the fixed mold and the movable mold are combined into an injection molding cavity, and each insert is fixedly suspended between adjacent two injection molding cavities; inserting the bottom of the ejector rod into the injection molding cavity and abutting against the bottom of the injection molding cavity; injecting molten plastic material through a hot runner nozzle located below the injection molding cavity, and using the plastic material to fill the area above the hot runner hole and below the ejector rod; cooling the plastic material, and obtaining the pre-embedded sleeve after removing the fixed mold and the movable mold. This method can ensure uniform overall shrinkage, and obtain a pre-embedded sleeve with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation.

Description

Technical Field

[0001] The present invention relates to the technical field of railway fasteners, and particularly 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 challenges 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, a large deviation in the wall thickness size 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, resulting in risks of train rocking or derailment; or, the sleeves with uneven wall thickness form weak points inside the sleeper, which are prone to crack under long-term train dynamic loads, and even cause local fracture of the sleeper.

[0004] Therefore, on the basis of the existing pre-embedded sleeves formed by injection molding, there is an urgent need to provide a manufacturing method for railway sleeper pre-embedded sleeves to avoid the above situations, so as to obtain pre-embedded sleeves with small wall thickness differences, consistent shrinkage deformation, and small size 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:

[0007] In a 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;

[0008] Step 1: Install long strip-shaped inserts between adjacent two semi-cavities of the sleeve bodies in the fixed mold;

[0009] Step 2: Close the fixed mold and the moving mold, so that the corresponding two semi-cavities of the sleeve bodies in the fixed mold and the moving mold are combined into an injection molding cavity, and each insert is fixed in a suspended state between the adjacent two injection molding cavities;

[0010] Step 3: Insert the bottom of the ejector rod into the injection molding cavity and abut against the bottom of the injection molding cavity;

[0011] Step Four: Inject molten plastic material through the hot runner nozzle located below the injection mold cavity, and use the plastic material to fill the area above the hot runner hole and below the ejector rod;

[0012] Step Five: Cool down the plastic material, and after removing the fixed mold and the moving mold, obtain the embedded sleeve.

[0013] 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, and the fixing holes are for the insert posts to penetrate into.

[0014] As an embodiment of the present invention, the insert posts provided on the fixed mold and the moving mold both include the first type of insert post and the 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;

[0015] 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.

[0016] As an embodiment of the present invention, in the fixed mold, three insert posts are provided between two adjacent sleeve body half-cavities, the three insert posts are vertically arranged along the symmetry line of the two sleeve body half-cavities, the insert post located at the uppermost part is the first type of insert post, and the remaining two insert posts are the second type of insert posts;

[0017] 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.

[0018] As an embodiment of the present invention, in the moving mold, four insert posts are provided between two adjacent sleeve body half-cavities, which include: two horizontally arranged first type of insert posts and two vertically arranged second type of insert posts;

[0019] After the fixed mold and the moving mold are closed, 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.

[0020] As an embodiment of the present invention, the insert includes an insert body and a fixing part, the insert body is in a wavy shape, and the fixing holes are provided on both end faces of the fixing part.

[0021] As an embodiment of the present invention, cooling channels are provided in both the fixed mold and the moving mold, and in Step Five, the plastic material is cooled by injecting a cooling medium into the cooling channels.

[0022] 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;

[0023] 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.

[0024] In a second aspect, there is provided a railway sleeper embedded sleeve obtained by the method for manufacturing a railway sleeper embedded sleeve as described in the first aspect.

[0025] The beneficial effects of adopting the above technical solutions are as follows:

[0026] In the method for manufacturing a railway sleeper embedded sleeve provided by the embodiment of the present invention, by suspending the insert between the injection mold cavities, the insert 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, the molten plastic material is filled more evenly and will cover the periphery of the insert; then, after cooling the molten plastic material, it can ensure uniform shrinkage as a whole, and obtain an embedded sleeve with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of a railway sleeper embedded sleeve provided by an embodiment of the present invention.

[0028] Figure 2 is a schematic structural diagram of a fixed mold provided by an embodiment of the present invention.

[0029] Figure 3 is Figure 2 a schematic structural diagram after installing the insert.

[0030] Figure 4 is a schematic structural diagram of a moving mold provided by an embodiment of the present invention.

[0031] Figure 5 is a sectional view after installing the insert provided by an embodiment of the present invention.

[0032] Figure 6 is a schematic internal structural diagram after installing the ejector rod provided by an embodiment of the present invention.

[0033] 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.

[0034] Figure 8 is a schematic installation diagram of a cooling channel provided by an embodiment of the present invention.

[0035] Figure 9 It is a schematic structural diagram of a cooling channel provided by an embodiment of the present invention.

[0036] Figure 10 It is a filling schematic diagram of the molten plastic material of the present invention without adding inserts during injection molding from 0.0000 s to 0.5422 s.

[0037] Figure 11 It is a filling schematic diagram of the molten plastic material of the present invention without adding inserts during injection molding from 0.0000 s to 1.521 s.

[0038] Figure 12 It is a filling schematic diagram of the molten plastic material of the present invention without adding inserts during injection molding from 0.0000 s to 3.139 s.

[0039] Figure 13 It is a schematic diagram of the injection molding process of the molten plastic material of the present invention with added inserts from 0.0000 s to 0.216 s.

[0040] Figure 14 It is a schematic diagram of the injection molding process of the molten plastic material of the present invention with added inserts from 0.0000 s to 2.279 s.

[0041] Figure 15 It is a schematic diagram of the injection molding process of the molten plastic material of the present invention with added inserts from 0.0000 s to 2.375 s.

[0042] Figure 16 It is a thermal effect diagram of the cooling process of the present invention without adding inserts.

[0043] Figure 17 It is a thermal effect diagram of the cooling process of the present invention with added inserts.

[0044] Wherein: 100 embedded sleeve, 101 sleeve seat, 102 sleeve body;

[0045] 1 fixed mold, 1-1 half cavity of the sleeve 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. Specific Embodiments

[0046] To make the objectives, technical solutions and advantages of the present invention clearer, the following describes the invention clearly and completely with reference to specific embodiments.

[0047] Embodiment 1

[0048] An embodiment of the present invention provides a manufacturing method for pre-embedded sleeves of railway sleepers, as Figure 1 shown, the pre-embedded sleeve 100 includes a sleeve base 101 and a plurality of sleeve bodies 102 arranged on the sleeve base 101;

[0049] The manufacturing method includes:

[0050] Step 1: Install a long strip-shaped insert 2 between two adjacent sleeve body half-cavities 1-1 in the fixed mold 1;

[0051] 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 fixedly suspended between two adjacent injection mold cavities;

[0052] 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;

[0053] 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;

[0054] Step 5: Cool the plastic material, and remove the fixed mold 1 and the moving mold 3 to obtain the pre-embedded sleeve 100.

[0055] The manufacturing method for pre-embedded sleeves of railway sleepers provided by the embodiment of the present invention, by suspending the insert 2 between the injection mold cavities, enables the insert 2 to be 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, obtain a pre-embedded sleeve 100 with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation.

[0056] Embodiment 2

[0057] An embodiment of the present invention provides a manufacturing method for a railway sleeper pre-embedded sleeve 100, as Figure 1 shown, the pre-embedded sleeve 100 includes a sleeve base 101 and a plurality of sleeve bodies 102 arranged on the sleeve base 101;

[0058] The manufacturing method includes:

[0059] Step S1: Install a long strip-shaped insert 2 between two adjacent sleeve body half-cavities 1-1 in the fixed mold 1;

[0060] To match the embedded casing 100, the fixed mold 1 is provided with half-cavities 1-1 of the casing body that are adapted to the number of the casing bodies 102 on the embedded casing 100. The number can be three, four, or any other value that meets the requirements. Exemplarily, the structure of the fixed mold 1 is as Figure 2 shown, and it is provided with three half-cavities 1-1 of the casing body.

[0061] In this case, two strip-shaped inserts 2 are provided, and their installation positions are as Figure 3 shown.

[0062] Step S2: Close the fixed mold 1 and the moving mold 3 so that the corresponding two half-cavities 1-1 of the casing body in the fixed mold 1 and the moving mold 3 are combined into an injection mold cavity, and each of the inserts 2 is fixedly arranged in a suspended state between two adjacent injection mold cavities;

[0063] As Figure 4 shown, the number of the half-cavities 1-1 of the casing body 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 half-cavities 1-1 of the casing body in the fixed mold 1 and the moving mold 3 can be combined into an injection mold cavity. When there are three half-cavities 1-1 of the casing body on the fixed mold 1, there are also three half-cavities 1-1 of the casing body on the moving mold 3.

[0064] Further, in order to fixedly arrange all the inserts 2 in a suspended state 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 and the moving mold 3.

[0065] 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 part 2-3. The insert body 2-2 is wavy. The fixing holes 2-1 are provided on both end faces of the fixing part 2-3. The waviness of the insert body 2-2 is adapted to the internal threads on the inner wall of the half-cavity 1-1 of the casing body, which can further ensure the uniformity of the filling of the molten plastic material and reduce the uneven shrinkage to a greater extent.

[0066] 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;

[0067] The first type of insert post 3-1-1 is used to penetrate into the fixing hole 2-1. After abutting against the fixing hole 2-1, the second type of insert post 3-1-2 abuts against the corresponding side insert body 2-2.

[0068] Further, as Figure 3 shown, on one side of the insert 2 (specifically the fixing part 2-3) close to the fixed mold 1, there is a fixing hole 2-1, and on one side close to the moving mold 3, there are two fixing holes 2-1;

[0069] 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 other two insert posts 3-1 are the second type of insert post 3-1-2.

[0070] In the moving mold 3, four insert posts 3-1 are arranged between two adjacent sleeve body half-cavities 1-1, including: two horizontally arranged first type of insert posts 3-1-1 and two vertically arranged second type of insert posts 3-1-2;

[0071] After the fixed mold 1 and the moving mold 3 are closed, the axes of the two first type of insert posts 3-1-1 in the moving mold 3 and 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;

[0072] During installation, the fixing hole 2-1 on the insert 2 is penetrated into the first type of insert post 3-1-1 in the fixed mold 1, so that the other two second type of insert posts 3-1-2 abut against one side of the insert body 2-2; then, the fixed mold 1 and the moving mold 3 are closed, so that the two horizontally arranged first type of insert posts 3-1-1 in the moving mold 3 penetrate into the two fixing holes 2-1 on the other side of the insert 2, and the other two vertically arranged second type of insert posts 3-1-2 abut against the other side of the insert body 2-2; of course, 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.

[0073] 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 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 applied to the insert 2 can be ensured, thereby ensuring the uniformity of the filling of the molten plastic material.

[0074] The present invention does not specifically limit the molding method and size of the insert 2. Exemplarily, the insert 2 is a plastic part obtained by injection molding and has a rough surface. The size of the insert 2 is determined according to the size of the position where the insert is placed (between two adjacent half-cavities 1-1 of the sleeve body), and the insert 2 is as large as possible without being exposed. If the amount of reserved glue (molten plastic material) is too small, the temperature of the molten glue will decrease when it flows through the insert, causing premature cooling and glue shortage, 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 increase, and the ideal effect will not be achieved.

[0075] In an embodiment of the present invention, when the diameter of the sleeve seat 101 in the embedded sleeve 100 is 45 cm, the axial center distance between any two adjacent sleeve seats 101 is 75 cm; the height of the cylindrical part is 39 cm, and the height of the threaded part is 96 cm; 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.

[0076] Step S3, insert the bottom of the ejector pin 4 into the injection cavity and abut against the bottom of the injection cavity, as shown in FIG. Figure 6 As shown, the size of the ejector pin is smaller than the size of the injection cavity;

[0077] Step S4, injecting molten plastic material through the hot runner nozzle 6 located below the injection cavity, using the plastic material to fill the area from above the hot runner hole 5 to below the push rod 4, to obtain a complete railway sleeper embedded casing production mold, such as Figure 7 shown.

[0078] Step S5, cooling the plastic material, and removing the fixed mold 1 and the movable mold 3 to obtain the embedded sleeve 100.

[0079] Among them, Figure 8 and Figure 9 As shown, the fixed mold 1 and the movable mold 3 are both provided with a cooling channel 7, and in step five, the plastic material is cooled by injecting a cooling medium (such as water) into the cooling channel 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;

[0080] 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.

[0081] In the embodiments of the present invention, according to the method of feeding the molten plastic material from the bottom, the fourth coil pipe 7-4 and the third coil pipe 7-3 are respectively arranged at the bottom, and the first coil pipe 7-1 and the second coil pipe 7-2 arranged side by side are arranged at the top to achieve zoning control of the cooling rate. When cooling, by adding a liquid at 60°C (for example, water) into these four coil pipes, it can ensure overall uniform shrinkage, and obtain a buried sleeve 100 with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation.

[0082] Effect example:

[0083] Furthermore, 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 molding process and an analysis and evaluation of the shrinkage process deformation.

[0084] 1. Analysis and evaluation of the injection molding process

[0085] The present invention conducts a thermal effect imaging analysis on the filling process of injecting molten plastic material through the hot runner nozzle 6 arranged 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 Figures 10 - 12 shown; the image obtained after adding the insert is as Figures 13 - 15 shown. 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.

[0086] 2. Analysis and evaluation of the shrinkage process deformation

[0087] The present invention conducts a 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 Figure 16 shown; the image obtained after adding the insert is as Figure 17 shown. It can be seen from the above figures that the shrinkage value of the product with the insert 2 is half of the original, with an obvious effect.

[0088] Therefore, through the method for manufacturing the railway sleeper embedded sleeve provided by the present invention, it can ensure overall uniform shrinkage, and further obtain a buried sleeve 100 with a small wall thickness difference, consistent shrinkage deformation, and small dimensional deviation.

[0089] 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 on 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 manufacturing method of embedded sleeves for railway sleepers, characterized in that, The embedded sleeve (100) includes a sleeve base (101) and a plurality of sleeve bodies (102) arranged on the sleeve base (101); Step 1: Install a strip-shaped insert (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 a hot runner nozzle (6) arranged in a hot runner hole (5) below the injection mold cavity, so that the plastic material fills 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); Both sides of the insert (2) are provided with fixing holes (2-1), the fixing holes (2-1) are blind holes, both the fixed mold (1) and the moving mold (3) are provided with insert posts (3-1), and the fixing holes (2-1) are used for the insert posts (3-1) to penetrate; the insert (2) includes an insert body (2-2) and a fixing part (2-3), the insert body (2-2) is wavy, and the two end faces of the fixing part (2-3) are both provided with the fixing holes (2-1), and the wave shape of the insert body (2-2) is adapted to the internal thread on the inner wall of the sleeve body half-cavity (1-1); The insert posts (3-1) arranged 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 the length 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 insert body (2-2).

2. The manufacturing method of the embedded sleeve for railway sleeper according to claim 1, characterized in that, In the fixed mold (1), three insert posts (3-1) are arranged between two adjacent sleeve body half-cavities (1-1), and 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 at the uppermost position is the first type of insert post (3-1-1), and the other two insert posts are the second type of insert posts (3-1-2); One fixing hole (2-1) is arranged on the side of the insert (2) close to the fixed mold (1). After the first type of insert post (3-1-1) penetrates into the fixing hole (2-1), the other two second type of insert posts (3-1-2) abut against the opposite insert body (2-2).

3. The manufacturing method of a pre-embedded sleeve for railway sleepers according to claim 1, characterized in that, In the moving mold (3), four insert posts (3-1) are arranged between two adjacent sleeve body half-cavities (1-1), which include: two first-type insert posts (3-1-1) arranged horizontally and two second-type insert posts (3-1-2) arranged vertically. After the fixed mold (1) and the moving mold (3) are clamped, the axes of the two first-type insert posts (3-1-1) in the moving mold (3) and the first-type insert posts (3-1-1) in the fixed mold (1) are on the same horizontal line; the axes of the two second-type insert posts (3-1-2) in the moving mold (3) are respectively collinear with the axes of the corresponding two second-type insert posts (3-1-2) in the fixed mold (1).

4. The manufacturing method of the embedded sleeve for railway sleepers according to claim 1, characterized in that, Cooling channels (7) are arranged in both the fixed mold (1) and the moving mold (3), and in step five, the plastic material is cooled by injecting a cooling medium into the cooling channels (7).

5. The manufacturing method of the embedded sleeve for railway sleepers according to claim 4, characterized in that, The cooling channel (7) includes a first coil pipe (7-1) and a second coil pipe (7-2) arranged in parallel, a third coil pipe (7-3) located below the first coil pipe (7-1) and the second coil pipe (7-2), and a fourth coil pipe (7-4) located below the third coil pipe (7-3). The bottom of the fourth coil pipe (7-4) is located below the injection mold cavity, and the tops of the first coil pipe (7-1) and the second coil pipe (7-2) are both located above the injection mold cavity.

6. A pre-embedded sleeve for railway sleepers, characterized in that, It is obtained by using the manufacturing method of a railway sleeper embedded sleeve according to any one of claims 1 to 5.

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