Runner casting air cylinder

Abstract

The utility model belongs to the technical field of hot runner cylinders, and particularly relates to a runner casting cylinder which solves the problems that rotation of a valve needle cannot be limited, and the valve needle is inconvenient to disassemble and assemble. The runner casting air cylinder comprises an air cylinder body, a piston is movably connected in the air cylinder body in a sleeved mode, the air cylinder body is detachably fixed to a base, the lower end of a piston rod of the piston penetrates out of the air cylinder body and is detachably connected with a valve needle, and a first rotation stopping structure is arranged between the piston rod and the base. And a second rotation stopping structure is arranged between the valve needle and the piston rod. The effects that the valve needle is effectively prevented from rotating, the valve needle is convenient to disassemble and assemble under the condition that the air cylinder body is not disassembled, and the structure is simple are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot runner cylinders, in particular to a runner casting cylinder. Background Art

[0002] Hot runner is a heating component system used in injection molds to inject melted plastic particles into the mold cavity. Hot runner molds are a new structure that heats the runners and sprues of traditional molds or three-plate molds, eliminating the need to remove the runners and sprues during each molding process.

[0003] Hot runner cylinder refers to an air cylinder with adjustable length, which is used to realize the automatic opening and closing, locking and ejection of the mold. It is a very important component.

[0004] However, most hot runner cylinders in the current existing technology do not have a rotation-stopping function and cannot limit the possible rotation of the valve needle during telescopic use. Even in order to achieve the rotation-stopping effect, a built-in pin solution is generally adopted, which is troublesome to disassemble and assemble. Moreover, the valve needles of most hot runner cylinders are generally hung inside the cylinder. During maintenance, the cylinder must be disassembled, or the valve needle accessories of the heating system need to be heated for maintenance, which is not conducive to maintenance and replacement. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the prior art and to propose a flow channel casting cylinder.

[0006] In order to achieve the purpose of innovation of this utility model, the following technical solutions can be used:

[0007] A flow channel casting cylinder includes a cylinder body, a piston movably sleeved inside the cylinder body, the cylinder body being detachably fixed to a base, the lower end of the piston rod of the piston passing through the cylinder body and being detachably connected to a valve needle, a first anti-rotation structure being provided between the piston rod and the base, and a second anti-rotation structure being provided between the valve needle and the piston rod.

[0008] This runner casting cylinder is used for pneumatic control in hot runner systems. A piston is provided in the cylinder body, and a valve needle is provided at the lower end of the piston. The extension and retraction control of the valve needle is achieved through the movement of the piston, wherein the valve needle is detachably fixed to the portion of the piston rod passing through the cylinder body. The valve needle can be disassembled and assembled without disassembling the cylinder body. The valve needle extends through the base and is inserted into the corresponding hot runner plate. The first anti-rotation structure and the second anti-rotation structure are used to limit the rotation between the valve needle, the piston rod and the base to ensure the accuracy of the valve needle extension and retraction control.

[0009] In the above-mentioned runner casting cylinder, the cylinder body includes a cylinder body and a cylinder head. The cylinder body and the base are fixed by connecting bolts. The cylinder head is clamped between the cylinder body and the base. The piston rod movably passes through the cylinder head.

[0010] The cylinder body consists of a cylinder block and a cylinder head. The cylinder block is fixed to the base with connecting bolts, and the cylinder head is clamped between the base and the cylinder block to reduce assembly costs. A sealing ring assembly is provided between the cylinder head and the cylinder block to further ensure the seal between the cylinder head and the cylinder block. The piston rod is inserted into the cylinder head for axial movement and is also provided with a sealing ring assembly between them. The sealing ring assembly is common knowledge and will not be elaborated on in detail.

[0011] In the above-mentioned flow channel casting cylinder, the cylinder body, cylinder head and base are all integrally cast.

[0012] The cylinder block, cylinder head and base are all made of castings and have excellent structural strength. During specific production, according to the size of the product, a small amount of machining allowance can be added to the positions that require fine machining, which greatly reduces the machining allowance.

[0013] In the above-mentioned runner casting cylinder, a piston rod through hole is provided through the middle of the base, the first anti-rotation structure includes an anti-rotation platform provided on the inner wall of the piston rod through hole, and a first anti-rotation plane is provided on the side of the piston rod, and the first anti-rotation plane and the side wall of the anti-rotation platform slide against each other to limit the rotation.

[0014] The piston rod is passed through the piston rod through hole, and an anti-rotation platform is provided in the piston rod through hole. The first anti-rotation plane on the side of the piston rod is in contact with the side of the anti-rotation platform, achieving the effect of vertical relative sliding but rotation limitation. The first anti-rotation plane is equivalent to a notch cut vertically on the side of the cylindrical piston rod, which is easy to process.

[0015] In the above-mentioned runner casting cylinder, the piston includes a piston head and a piston rod connected as one piece, the side wall of the lower end of the piston rod is provided with a T-shaped limit groove, the annular limit platform at the upper end of the valve needle is clamped in the horizontal section of the limit groove, and the needle rod body is just clamped in the vertical section of the limit groove, and the second anti-rotation structure includes a second anti-rotation plane vertically arranged on the side of the annular limit platform, and the second anti-rotation plane is in contact with the side wall of the horizontal section.

[0016] The limiting groove is T-shaped and is horizontally opened on the side of the piston rod. The horizontal section is used to clamp the annular limiting platform of the valve needle, and the vertical section is used to clamp the needle rod body of the valve needle, so as to achieve stable fixation of the valve needle and have convenient detachability. The second anti-rotation plane is set on the side wall of the annular limiting platform, which is equivalent to a vertical notch cut out of the annular limiting platform. The second anti-rotation plane and the side wall of the horizontal section are fitted together to achieve rotation limitation. The structure is simple, and effective rotation limitation can be achieved when the valve needle is fully clamped and installed in the limiting groove, and assembly is convenient.

[0017] In the above-mentioned flow channel casting cylinder, the anti-rotation platform is provided with a clearance opening near the valve needle for making way for the annular limit platform, and the width of the clearance opening is equal to or slightly larger than the outer diameter of the annular limit platform.

[0018] A clearance opening is provided on the side of the anti-rotation platform, the size of which is adapted to the size of the annular limit platform. The annular limit platform is used to be inserted into the limit groove at the lower end of the piston rod to achieve detachable installation and fixation. The clearance opening is used to make way for the annular limit platform to horizontally exit the limit groove, thereby ensuring convenient disassembly and assembly.

[0019] In the above-mentioned runner casting cylinder, the base is fixed to the hot runner plate by mounting bolts, a positioning hole is provided on the hot runner plate, a positioning ring is detachably fixed in the positioning hole, a valve needle through-hole is provided at the bottom of the positioning hole, and the valve needle passes through the positioning ring and the valve needle through-hole.

[0020] A positioning ring is provided in the positioning hole on the hot runner plate. The valve needle is inserted into the positioning ring and passes through the valve needle through-hole below to achieve horizontal positioning and limiting. The positioning ring and the positioning hole, as well as the base and the hot runner plate are all detachably fixed, making disassembly and assembly easy.

[0021] In the above-mentioned flow channel casting cylinder, the positioning ring is in an inverted T shape, the outer end of the positioning ring is sleeved with an external nut, the external nut is engaged with the internal thread of the positioning hole, and the valve needle through hole is a radially extending straight line.

[0022] The external threaded nut is screwed into the positioning hole, and the positioning ring is pressed into the positioning hole to achieve detachable fixation. In addition, the valve needle through-hole is a radially extending straight line. After the positioning ring and the external threaded nut are screwed out of the positioning hole, the valve needle can move horizontally in the valve needle through-hole. This horizontal movement is adapted to the path of the valve needle's annular limit platform moving out of the limit groove, ensuring that the valve needle can be disassembled and assembled without removing the base and the cylinder body, facilitating subsequent replacement and maintenance.

[0023] In the above-mentioned runner casting cylinder, the lower end of the piston rod is provided with a blind hole with one side open, and the inner diameter of the blind hole is larger than the outer diameter of the positioning ring;

[0024] When the piston is at its highest position, the distance between the lower end of the piston rod and the hot runner plate is greater than or equal to the height of the outer nut, and the distance between the top surface of the blind hole and the hot runner plate is greater than or equal to the height of the positioning ring.

[0025] The blind hole is set at the lower end of the piston rod, which is used to make way for the upper end of the locating ring when the piston rod is extended and retracted. One side of the blind hole is open, which is used to make way for the valve needle and the locating ring during the removal of the valve needle. The spacing between the piston rod and the hot runner plate and the spacing between the blind hole and the hot runner plate allow the locating ring and the outer thread nut to be completely unscrewed from the locating hole, ensuring smooth disassembly and assembly of the valve needle.

[0026] In the above-mentioned runner casting cylinder, a first exhaust hole is provided on the upper part of the cylinder body, and a second exhaust hole is provided on the lower part. The first exhaust hole and the second exhaust hole are connected to the inner cavity of the cylinder body and are both provided with internal threads; a cooling flow channel surrounding the outside of the piston rod is provided in the cylinder head, and a coolant delivery port connected to the two ends of the cooling flow channel is provided on the cylinder head; a spare port connected to the middle section of the cooling flow channel is also provided on the cylinder head, and the spare port can be removably sealed by a plug.

[0027] The first exhaust hole and the second exhaust hole on the cylinder body are used to connect to the high-pressure gas generating assembly, wherein the first exhaust hole is connected to the cavity above the piston head, and the second exhaust hole is connected to the cavity below, so as to realize the expansion and contraction control of the piston. The cooling channel is provided in the cylinder head, and is used to control the temperature of the cylinder body. Specifically, the coolant is input from the coolant delivery port, and the coolant flows through the cooling channel for heat exchange to achieve the purpose of temperature control. The middle section of the cooling channel is connected to the spare port, and the spare port is usually blocked by a plug. When the cooling channel is blocked or in some special circumstances, the plug can be removed to complete the repair or maintenance of the cooling channel. The plug can be a ball-type plug with a good sealing effect. The connection between the high-pressure gas generating assembly and the two exhaust holes is common knowledge and will not be elaborated in detail.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The valve needle of this runner casting cylinder is detachably fixed to the part of the piston rod that passes through the cylinder body. The valve needle can be disassembled and assembled without disassembling the cylinder body. The valve needle extends through the base and is inserted into the corresponding hot runner plate. The first anti-rotation structure and the second anti-rotation structure are used to limit the rotation between the valve needle, piston rod and base to ensure the accuracy of the valve needle extension and retraction control.

[0030] 2. The cylinder body consists of a cylinder block and a cylinder head. The cylinder block is fixed to the base by connecting bolts, and the cylinder head is clamped between the base and the cylinder block, reducing assembly costs.

[0031] 3. The cylinder block, cylinder head and base are all made of castings and have excellent structural strength. During specific production, according to the size of the product, a small amount of machining allowance can be added at the position requiring fine machining, which greatly reduces the machining allowance.

[0032] 4. The piston rod is passed through the piston rod through hole, and an anti-rotation platform is provided in the piston rod through hole. The first anti-rotation plane on the side of the piston rod is in contact with the side of the anti-rotation platform, achieving the effect of vertical relative sliding but rotation limitation.

[0033] 5. A positioning ring is provided in the positioning hole on the hot runner plate. The valve needle is inserted into the positioning ring and passes through the valve needle through-hole below to achieve horizontal positioning and limiting. The positioning ring and the positioning hole, as well as the base and the hot runner plate are all detachable and fixed, making disassembly and assembly easy.

[0034] 6. The valve needle through hole is a radially extending straight line. After the locating ring and the outer thread nut are screwed out of the locating hole, the valve needle can move horizontally in the valve needle through hole. The horizontal movement is adapted to the path of the valve needle's annular limit platform moving out of the limit groove, ensuring that the valve needle can be disassembled and assembled without removing the base and the cylinder body, facilitating subsequent replacement and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure provided by the utility model;

[0036] Figure 2 It is a right side view schematic diagram provided by the utility model;

[0037] Figure 3 yes Figure 2 Schematic diagram of the cross section at AA in the middle;

[0038] Figure 4 yes Figure 2 Schematic diagram of the cross section at the middle BB;

[0039] Figure 5 This is a schematic structural diagram of the cylinder cover provided by the utility model;

[0040] Figure 6 This is a structural diagram of the piston provided by the utility model;

[0041] Figure 7 This is a schematic diagram of the structure of the valve needle provided by the utility model;

[0042] Figure 8 It is a structural schematic diagram of the base provided by the utility model.

[0043] In the figure, the cylinder body 1, the cylinder body 11, the cylinder head 12, the piston 13, the piston head 14, the piston rod 15, the connecting bolt 16, the limiting groove 17, the blind hole 18, the first exhaust hole 19, the second exhaust hole 20, the cooling channel 21, the coolant delivery port 22, the spare port 23, the plug 24, the base 3, the piston rod through hole 31, the mounting bolt 32, the hot runner plate 4, the positioning hole 41, the positioning ring 42, the valve needle through hole 43, the external nut 44, the first anti-rotation structure 5, the anti-rotation platform 51, the first anti-rotation plane 52, the yield port 53, the second anti-rotation structure 6, the second anti-rotation plane 61, the valve needle 7, the annular limiting platform 71, and the needle rod body 72. DETAILED DESCRIPTION

[0044] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0045] Specific implementation examples Figure 1-8 As shown, the flow channel casting cylinder includes a cylinder body 1, a piston 13 is movably sleeved inside the cylinder body 1, the cylinder body 1 is detachably fixed to the base 3, the lower end of the piston rod 15 of the piston 13 passes through the cylinder body 1 and is detachably connected to the valve needle 7, a first anti-rotation structure 5 is provided between the piston rod 15 and the base 3, and a second anti-rotation structure 6 is provided between the valve needle 7 and the piston rod 15.

[0046] Specifically, this runner casting cylinder is used for pneumatic control in the hot runner system. A piston 13 is provided in the cylinder body 1, and a valve needle 7 is provided at the lower end of the piston 13. The extension and retraction control of the valve needle 7 is achieved through the movement of the piston 13, wherein the valve needle 7 is detachably fixed to the part of the piston rod 15 that passes through the cylinder body 1. The valve needle 7 can be disassembled and assembled without disassembling the cylinder body 1. The valve needle 7 passes through the base 3 and is inserted into the corresponding hot runner plate 4. The first anti-rotation structure 5 and the second anti-rotation structure 6 are used to limit the rotation between the valve needle 7, the piston rod 15 and the base 3, thereby ensuring the accuracy of the extension and retraction control of the valve needle 7.

[0047] like Figure 1-3 As shown, the cylinder body 1 includes a cylinder body 11 and a cylinder head 12. The cylinder body 11 and the base 3 are fixed by connecting bolts 16. The cylinder head 12 is clamped between the cylinder body 11 and the base 3. The piston rod 15 moves through the cylinder head 12. The cylinder body 11, the cylinder head 12 and the base 3 are all integrally cast.

[0048] Specifically, the cylinder body 1 consists of a cylinder body 11 and a cylinder head 12. The cylinder body 11 is fixed to the base 3 via connecting bolts 16. The cylinder head 12 is clamped between the base 3 and the cylinder body 11, reducing assembly costs. A sealing ring assembly is provided between the cylinder head 12 and the cylinder body 11 to further ensure the seal between the cylinder head 12 and the cylinder body 11. The piston rod 15 is inserted into the cylinder head 12 for axial movement, and a sealing ring assembly is also provided between them. The cylinder body 11, cylinder head 12, and base 3 are all made of castings and have excellent structural strength. During actual production, a small amount of machining allowance can be added in the areas requiring fine machining according to the product size, greatly reducing the machining allowance.

[0049] like Figure 1 、 3 As shown in Figures 6 and 8, a piston rod through hole 31 is provided through the middle of the base 3. The first anti-rotation structure 5 includes an anti-rotation platform 51 provided on the inner wall of the piston rod through hole 31. A first anti-rotation plane 52 is provided on the side of the piston rod 15. The first anti-rotation plane 52 and the side wall of the anti-rotation platform 51 slide against each other to limit rotation. The piston 13 includes a piston head 14 and a piston rod 15 that are integrally connected. The side wall of the lower end of the piston rod 15 is provided with a T-shaped limit groove 17. The annular limit platform 71 at the upper end of the valve needle 7 is clamped in the horizontal section of the limit groove 17, and the needle rod body 72 is just clamped in the vertical section of the limit groove 17. The second anti-rotation structure 6 includes a second anti-rotation plane 61 vertically provided on the side of the annular limit platform 71. The second anti-rotation plane 61 is in contact with the side wall of the horizontal section. A clearance opening 53 is provided on the anti-rotation platform 51 near the valve needle 7. The width of the clearance opening 53 is slightly larger than the outer diameter of the annular limit platform 71.

[0050] Specifically, the piston rod 15 is passed through the piston rod through hole 31, and an anti-rotation platform 51 is provided in the piston rod through hole 31. The first anti-rotation plane 52 on the side of the piston rod 15 is in contact with the side of the anti-rotation platform 51, achieving the effect of vertical relative sliding but rotation limitation, wherein the first anti-rotation plane 52 is equivalent to a notch cut vertically on the side of the cylindrical piston rod 15, which is easy to process. A clearance opening 53 is provided on the side of the anti-rotation platform 51, and the size of the clearance opening 53 is adapted to the size of the annular limit platform 71. The annular limit platform 71 is used to snap into the limit groove 17 at the lower end of the piston rod 15 to achieve detachable installation and fixation. The clearance opening 53 is used to make way for the annular limit platform 71 to horizontally exit the limit groove 17, ensuring the effect of convenient disassembly and assembly. The limiting groove 17 is T-shaped and is horizontally opened on the side of the piston rod 15. The horizontal section is used to clamp the annular limiting platform 71 of the valve needle 7, and the vertical section is used to clamp the needle rod body 72 of the valve needle 7, so as to achieve stable fixation of the valve needle 7 and have convenient detachability. The second anti-rotation plane 61 is set on the side wall of the annular limiting platform 71, which is equivalent to a vertical notch cut out of the annular limiting platform 71. The second anti-rotation plane 61 and the side wall of the horizontal section are fitted to achieve rotation limitation. The structure is simple, and effective rotation limitation can be achieved when the valve needle 7 is fully clamped and installed in the limiting groove 17, which is easy to assemble.

[0051] like Figure 1 、 3 As shown, the base 3 is secured to the hot runner plate 4 via mounting bolts 32. The hot runner plate 4 is provided with a positioning hole 41, into which a positioning ring 42 is removably secured. A valve needle hole 43 is provided at the bottom of the positioning hole 41, through which the valve needle 7 passes. The positioning ring 42 is in an inverted T-shape, with an externally threaded nut 44 sleeved on its outer end. The externally threaded nut 44 engages with the internal threads of the positioning hole 41. The valve needle hole 43 is a radially extending straight line. The lower end of the piston rod 15 is provided with a blind hole 18, open on one side. The inner diameter of the blind hole 18 is larger than the outer diameter of the positioning ring 42. When the piston 13 is in its highest position, the distance between the lower end of the piston rod 15 and the hot runner plate 4 is greater than or equal to the height of the externally threaded nut 44, and the distance between the top surface of the blind hole 18 and the hot runner plate 4 is greater than or equal to the height of the positioning ring 42.

[0052] Specifically, a positioning ring 42 is provided in the positioning hole 41 on the hot runner plate 4. The valve needle 7 is inserted into the positioning ring 42 and passes through the valve needle through hole 43 below to achieve horizontal positioning and limiting. The positioning ring 42 and the positioning hole 41, as well as the base 3 and the hot runner plate 4, are all detachably fixed, making disassembly and assembly convenient. The outer thread nut 44 is screwed into the positioning hole 41, pressing the positioning ring 42 into the positioning hole 41 to achieve detachable fixation. In addition, the valve needle through hole 43 is a radially extending straight line. After the positioning ring 42 and the outer thread nut 44 are screwed out of the positioning hole 41, the valve needle 7 can move horizontally within the valve needle through hole 43. This horizontal movement is consistent with the path of the annular limit platform 71 of the valve needle 7 moving out of the limit groove 17, ensuring that the valve needle 7 can be disassembled and assembled without removing the base 3 and the cylinder body 1, facilitating subsequent replacement and maintenance. The give-way blind hole 18 is set at the lower end of the piston rod 15, and is used to give way to the upper end of the positioning ring 42 when the piston rod 15 is extended or retracted. One side of the give-way blind hole 18 is open, and is used to give way to the valve needle 7 and the positioning ring 42 during the removal of the valve needle 7. When the piston 13 is at the highest position, the distance between the lower end of the piston rod 15 and the hot runner plate 4 is greater than the height of the external nut 44, and the distance between the top surface of the give-way blind hole 18 and the hot runner plate 4 is greater than the height of the positioning ring 42, ensuring that the valve needle 7 can be smoothly disassembled and assembled after the positioning ring 42 and the external nut 44 are completely unscrewed from the positioning hole 41.

[0053] like Figure 1 、 4As shown in Figures 5 and 6, a first exhaust hole 19 is provided on the upper part of the cylinder body 11, and a second exhaust hole 20 is provided on the lower part. The first exhaust hole 19 and the second exhaust hole 20 are communicated with the inner cavity of the cylinder body 1, and are both provided with internal threads; a cooling channel 21 surrounding the outer side of the piston rod 15 is provided in the cylinder head 12, and a coolant delivery port 22 respectively communicated with both ends of the cooling channel 21, and a spare port 23 communicated with the middle section of the cooling channel 21 is provided on the cylinder head 12. The spare port 23 is detachably sealed by a plug 24.

[0054] Specifically, the first exhaust hole 19 and the second exhaust hole 20 on the cylinder body 11 are used to connect to the high-pressure gas generating assembly, wherein the first exhaust hole 19 is connected to the cavity above the piston head 14, and the second exhaust hole 20 is connected to the cavity below, thereby realizing the expansion and contraction control of the piston 13. The cooling flow channel 21 is provided in the cylinder head 12 and is used to control the temperature of the cylinder body 1. Specifically, the temperature control is achieved by inputting coolant from the coolant delivery port 22, and the coolant flows through the cooling flow channel 21 to exchange heat. The middle section of the cooling flow channel 21 is connected to the spare port 23. The spare port 23 is usually blocked by a ball-type plug. In the event of blockage of the cooling flow channel 21 or in some special circumstances, the plug 24 can be removed to complete the repair or maintenance of the cooling flow channel 21.

[0055] Specific working principle: After assembly, when the valve needle 7 needs to be removed, the output of the high-pressure gas generating assembly is adjusted to move the piston 13 to the highest position. Then, the outer nut 44 is screwed out, and the outer nut 44 and the positioning ring 42 are moved out of the positioning hole 41. The valve needle 7 is then moved horizontally, and the annular limit platform 71 is removed from the limit groove 17. The needle rod body 72 moves in the valve needle through hole 43. After the annular limit platform 71 completely leaves the limit groove 17, it can be removed from the clearance opening 53, completing the removal of the valve needle 7. To reinstall the valve needle 7, the reverse operation is performed.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A flow channel casting cylinder, comprising a cylinder body (1), wherein a piston (13) is movably sleeved in the cylinder body (1), characterized in that: The cylinder body (1) is detachably fixed to the base (3); the lower end of the piston rod (15) of the piston (13) passes through the cylinder body (1) and is detachably connected to the valve needle (7); a first anti-rotation structure (5) is provided between the piston rod (15) and the base (3); and a second anti-rotation structure (6) is provided between the valve needle (7) and the piston rod (15).

2. The runner casting cylinder according to claim 1, characterized in that: The cylinder body (1) includes a cylinder body (11) and a cylinder cover (12), the cylinder body (11) and the base (3) are fixed by connecting bolts (16), the cylinder cover (12) is clamped between the cylinder body (11) and the base (3), and the piston rod (15) movably passes through the cylinder cover (12).

3. The runner casting cylinder according to claim 2, characterized in that: The cylinder body (11), cylinder cover (12) and base (3) are all integrally cast.

4. The runner casting cylinder according to claim 1, characterized in that: A piston rod through hole (31) is provided through the middle of the base (3), the first anti-rotation structure (5) includes an anti-rotation platform (51) provided on the inner wall of the piston rod through hole (31), and a first anti-rotation plane (52) is provided on the side of the piston rod (15), and the first anti-rotation plane (52) and the side wall of the anti-rotation platform (51) slide against each other to limit rotation.

5. The runner casting cylinder according to claim 4, characterized in that: The piston (13) includes a piston head (14) and a piston rod (15) connected in one piece, and the side wall of the lower end of the piston rod (15) is provided with a T-shaped limit groove (17). The annular limit platform (71) at the upper end of the valve needle (7) is clamped in the horizontal section of the limit groove (17), and the needle rod body (72) is just clamped in the vertical section of the limit groove (17). The second anti-rotation structure (6) includes a second anti-rotation plane (61) vertically arranged on the side of the annular limit platform (71), and the second anti-rotation plane (61) is in contact with the side wall of the horizontal section.

6. The runner casting cylinder according to claim 5, characterized in that: The anti-rotation platform (51) is provided with a clearance opening (53) on the side near the valve needle (7) for making way for the annular limiting platform (71), and the width of the clearance opening (53) is equal to or slightly larger than the outer diameter of the annular limiting platform (71).

7. The runner casting cylinder according to claim 1, characterized in that: The base (3) is fixed to the hot runner plate (4) by means of mounting bolts (32). The hot runner plate (4) is provided with a positioning hole (41). A positioning ring (42) is detachably fixed in the positioning hole (41). A valve needle through hole (43) is provided at the bottom of the positioning hole (41). The valve needle (7) passes through the positioning ring (42) and the valve needle through hole (43).

8. The runner casting cylinder according to claim 7, characterized in that: The positioning ring (42) is in an inverted T shape. The outer end of the positioning ring (42) is sleeved with an external thread nut (44). The external thread nut (44) is engaged with the internal thread of the positioning hole (41). The valve needle through hole (43) is a radially extending straight line.

9. The runner casting cylinder according to claim 8, characterized in that: The lower end of the piston rod (15) is provided with a blind hole (18) with one side open, and the inner diameter of the blind hole (18) is larger than the outer diameter of the positioning ring (42); When the piston (13) is at its highest position, the distance between the lower end of the piston rod (15) and the hot runner plate (4) is greater than or equal to the height of the outer nut (44), and the distance between the top surface of the blind hole (18) and the hot runner plate (4) is greater than or equal to the height of the positioning ring (42).

10. The runner casting cylinder according to any one of claims 1 to 9, characterized in that: The cylinder body (11) of the cylinder main body (1) is provided with a first exhaust hole (19) on the upper part and a second exhaust hole (20) on the lower part. The first exhaust hole (19) and the second exhaust hole (20) are communicated with the inner cavity of the cylinder main body (1) and are both provided with internal threads. A cooling channel (21) surrounding the outside of the piston rod (15) is provided in the cylinder head (12) of the cylinder body (1), and a coolant delivery port (22) is provided on the cylinder head (12) and is respectively connected to both ends of the cooling channel (21); The cylinder cover (12) is also provided with a spare port (23) communicating with the middle section of the cooling channel (21), and the spare port (23) is detachably blocked by a plug (24).

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