Hot runner cylinder structure

Abstract

The utility model belongs to the technical field of cylinders, and particularly relates to a hot runner cylinder structure which comprises a cylinder wall groove, a piston plate matched with a sealing ring and slidably mounted in the cylinder wall groove, a piston rod mounted on one side of the piston plate, a connecting plate mounted at one end of the piston rod, and a connecting rod mounted on one side of the top end of the connecting plate. A positioning plate is mounted at one end of the connecting rod, and the positioning plate is mounted in the sliding groove in a sliding manner; when the piston plate moves, the piston rod is driven to move together, so that the connecting plate and the connecting rod can be driven to move, the connecting rod can drive the positioning plate to slide in the sliding groove, and when the piston plate moves to drive the piston rod to move, the needle valve moves along with the piston rod, so that opening and closing actions of the needle valve are achieved; and the position of the piston plate in the cylinder wall groove can be quickly judged, so that the opening and closing degree of the needle valve can be accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of cylinder technology, specifically a hot runner cylinder structure. Background Technology

[0002] Hot runner cylinders are a key driving component in hot runner systems, which are mainly used for the delivery and distribution of molten plastic during injection molding. Hot runner cylinders control the movement of valve needles or other components within the hot runner through the reciprocating motion of pistons, thereby precisely controlling the flow of molten plastic.

[0003] A Chinese patent with authorization announcement number CN217080965U discloses a highly stable hot runner cylinder, including a cylinder body with an inner cavity. The cylinder body has an oil inlet and an oil outlet on one side. A stroke pipe is symmetrically opened below the cylinder body. A piston is slidably arranged in the inner cavity. A movable rod is symmetrically arranged below the piston. Support slides are symmetrically opened on both sides of the stroke pipe. Sliding blocks are symmetrically arranged on both sides of the movable rod. When the movable rod moves up and down under the action of the piston, it is limited by the sliding blocks on both sides. In addition, the support slides on both sides of the stroke pipe can limit the sliding blocks, ensuring that the movable rod will not deviate during the extension and retraction process, thus improving the stability of the movable rod.

[0004] However, the above-mentioned cylinder still has some problems. In practical applications, the position of the piston plate cannot be quickly determined. In the hot runner system, it is difficult to accurately control the opening and closing degree of the needle valve. The amount and speed of plastic melt entering the mold cavity are difficult to keep consistent each time, which will lead to unstable quality of injection molded products. Therefore, a hot runner cylinder structure is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology and solve the problems mentioned in the background technology, this utility model proposes a hot runner cylinder structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A hot runner cylinder structure of this utility model includes cylinder heads, two of which are symmetrically arranged. A cylinder body is installed between the two cylinder heads. Fixing rods are installed at the four corners of the cylinder heads. A cylinder wall groove is formed inside the cylinder body. A piston plate is slidably installed inside the cylinder wall groove in cooperation with a sealing ring. The radius of the piston plate is equal to the inner diameter of the cylinder wall groove. A piston rod is installed on one side of the piston plate. One end of the piston rod slidably extends through to one side of one of the cylinder heads. A connecting plate is installed at one end of the piston rod. A connecting rod is installed on one side of the top of the connecting plate. A positioning plate is installed at one end of the connecting rod. An mounting plate is installed between the two top sides of the cylinder head. A sliding groove is formed inside the mounting plate. The positioning plate is slidably installed inside the sliding groove. The positioning plate enables external visualization of the piston plate position, thus facilitating quick judgment of the piston plate position and enabling control of the opening and closing degree of the needle valve.

[0007] Preferably, one end of the piston rod has a threaded groove through the connecting plate, and an installation block is installed inside the threaded groove. A needle valve is installed on one side of the installation block. The threaded connection facilitates quick disassembly and installation of the needle valve, improving maintenance efficiency.

[0008] Preferably, an oil supply pipe is installed inside one of the cylinder heads. The oil supply pipe is arranged in a ring inside the cylinder head. The cross-section of the oil supply pipe is composed of a combination of circles and rectangles. Several oil injection holes are opened on the inner side and one side of the oil supply pipe. The oil injection hole on one side is connected to the cylinder wall groove, and the oil injection hole on the inner side acts on the position through which the piston rod passes in the cylinder head, so as to achieve comprehensive lubrication between the piston plate and the cylinder wall groove, and between the piston rod and the cylinder head.

[0009] Preferably, an oil delivery pipe is connected to the bottom side of the oil supply pipe, the oil delivery pipe passes through the cylinder head, and a circular plate is slidably installed inside the oil delivery pipe. The radius of the circular plate is equal to the inner diameter of the oil delivery pipe. A support rod is installed on the bottom side of the circular plate, and the bottom end of the support rod extends to the outside of the oil delivery pipe and is equipped with a handle. The oil mist injection is controlled by manually operating the handle, which avoids excessive oil mist from affecting the piston plate power.

[0010] Preferably, the top end of the oil delivery pipe is connected to an oil inlet pipe, one end of which can be connected to an external lubricating oil storage tank. A valve is installed inside the oil inlet pipe to ensure the continuous operation of the lubrication system.

[0011] Preferably, the thickness of the positioning plate is the same as the thickness of the piston plate, and the positioning plate and the piston plate are on the same horizontal line, which improves the accuracy of judging the position of the piston plate.

[0012] The advantages of this utility model are:

[0013] 1. When the piston plate of this utility model moves, it drives the piston rod to move together, thereby driving the connecting plate and connecting rod to move. The connecting rod can drive the positioning plate to slide inside the slide groove. When the piston plate moves and drives the piston rod to move, the needle valve also moves, thereby realizing the opening and closing action of the needle valve. By observing the position of the positioning plate in the slide groove, the position of the piston plate in the cylinder wall groove can be quickly determined, thereby accurately controlling the opening and closing degree of the needle valve.

[0014] 2. In this utility model, opening the valve and pulling the handle causes the circular plate to move the support rod downwards, allowing lubricating oil to flow into the delivery pipe through the inlet pipe. After taking in an appropriate amount of lubricating oil, the valve is closed, and then the handle is pushed upwards. The support rod causes the circular plate to slide upwards within the delivery pipe, squeezing the lubricating oil in the delivery pipe into the oil supply pipe. The oil spray hole on one side sprays into the cylinder wall groove, lubricating the piston plate and the cylinder wall groove. The oil spray hole on the inner side acts on the position through which the piston rod passes in the cylinder head, lubricating the piston rod and the cylinder head. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the intermediate axis side view of the present invention;

[0017] Figure 2 This is a cross-sectional structural diagram of the cylinder.

[0018] Figure 3 This is a schematic diagram of the piston plate position monitoring component.

[0019] Figure 4 A schematic diagram of the needle valve mounting assembly structure;

[0020] Figure 5 This is a schematic diagram of the lubrication assembly structure.

[0021] In the diagram: 1. Cylinder head; 2. Cylinder body; 3. Piston plate; 4. Piston rod; 5. Connecting plate; 6. Connecting rod; 7. Positioning plate; 8. Mounting plate; 9. Slide groove; 10. Fixing rod; 11. Threaded groove; 12. Mounting block; 13. Needle valve; 14. Oil supply pipe; 15. Injection hole; 16. Oil delivery pipe; 17. Circular plate; 18. Support rod; 19. Handle; 20. Oil inlet pipe; 21. Valve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figure 1-4 As shown, a hot runner cylinder structure includes a cylinder head 1, two cylinder heads 1 are symmetrically arranged, and a cylinder body 2 is installed between the two cylinder heads 1. Fixing rods 10 are installed at the four corners between the cylinder heads 1. A cylinder wall groove is formed inside the cylinder body 2. A piston plate 3 is slidably installed inside the cylinder wall groove in cooperation with a sealing ring. The radius of the piston plate 3 is equal to the inner diameter of the cylinder wall groove. A piston rod 4 is installed on one side of the piston plate 3. One end of the piston rod 4 slidably extends through to one side of one of the cylinder heads 1. A connecting plate 5 is installed at one end of the piston rod 4. A connecting rod 6 is installed on one side of the top of the connecting plate 5. A positioning plate 7 is installed at one end of the connecting rod 6. An mounting plate 8 is installed between the two top sides of the cylinder head 1. A sliding groove 9 is formed inside the mounting plate 8. The positioning plate 7 is slidably installed inside the sliding groove 9. The thickness of the positioning plate 7 is equal to the thickness of the piston plate 3, and the positioning plate 7 and the piston plate 3 are on the same horizontal line.

[0024] One end of the piston rod 4 passes through the connecting plate 5 and has a threaded groove 11. An mounting block 12 is installed inside the threaded groove 11, and a needle valve 13 is installed on one side of the mounting block 12. During operation, in practical applications, the position of the piston plate 3 cannot be quickly determined. In a hot runner system, it is difficult to accurately control the opening and closing degree of the needle valve 13. The amount and speed of the molten plastic entering the mold cavity are difficult to maintain consistently each injection, leading to unstable quality of the injection molded product. The cylinder is installed on the injection mold. When compressed air is introduced into the air inlet of the hot runner cylinder, the compressed air pushes the piston plate 3 to slide within the cylinder wall groove of the cylinder body 2. Due to the piston... The radius of plate 3 is equal to the inner diameter of the cylinder wall groove, and with the cooperation of the sealing ring, good sealing performance can be ensured, so that piston plate 3 can make stable linear reciprocating motion. When piston plate 3 moves, it drives piston rod 4 to move together, which in turn drives connecting plate 5 and connecting rod 6 to move. Connecting rod 6 can drive positioning plate 7 to slide inside slide groove 9. Since the thickness of positioning plate 7 is the same as that of piston plate 3 and the two are on the same horizontal line, the operator can quickly judge the position of piston plate 3 in cylinder wall groove by observing the position of positioning plate 7 in slide groove 9. The above-mentioned air inlet is a conventional and essential structure of cylinder and is not the main innovation of this solution, so it is not elaborated in detail.

[0025] When the piston plate 3 moves, it drives the piston rod 4 to move, and the needle valve 13 also moves accordingly, thereby realizing the opening and closing action of the needle valve 13. After the operator judges the position of the piston plate 3 according to the positioning plate 7, he can accurately control the opening and closing degree of the needle valve 13. When the needle valve 13 needs to be replaced, the mounting block 12 can be removed from the inside of the threaded groove 11.

[0026] Please see Figure 1 , 2 As shown in Figure 5, an oil supply pipe 14 is installed inside one of the cylinder heads 1. The oil supply pipe 14 is arranged in a ring inside the cylinder head 1. The cross-section of the oil supply pipe 14 is composed of a combination of circles and rectangles. Several oil injection holes 15 are opened on the inner side and one side of the oil supply pipe 14. The oil injection hole 15 on one side is connected to the cylinder wall groove, and the oil injection hole 15 on the inner side acts on the position through which the piston rod 4 passes in the cylinder head 1.

[0027] The bottom side of the oil supply pipe 14 is connected to the oil delivery pipe 16, which passes through the cylinder head 1. A circular plate 17 is slidably installed inside the oil delivery pipe 16. The radius of the circular plate 17 is equal to the inner diameter of the oil delivery pipe 16. A support rod 18 is installed on the bottom side of the circular plate 17. The bottom end of the support rod 18 extends to the outside of the oil delivery pipe 16 and is equipped with a handle 19.

[0028] The top end of the oil delivery pipe 16 is connected to an oil inlet pipe 20, one end of which can be connected to an external lubricating oil storage tank. A valve 21 is installed inside the oil inlet pipe 20. During operation, the hot runner cylinder controls the movement of the valve needle or other components within the hot runner through the reciprocating motion of the piston, thereby precisely controlling the flow of the molten plastic. To ensure the cylinder can operate normally, regular lubrication is required. During lubrication, valve 21 is opened, and by pulling the handle 19, the circular plate 17 moves the support rod 18 downwards. Lubricating oil from the external lubricating oil storage tank flows into the oil delivery pipe 16 through the oil inlet pipe 20. After adding an appropriate amount of lubricating oil, valve 21 is closed. When the lubricating oil supply is stopped, the operator pushes the handle 19 upwards, causing the support rod 18 to drive the circular plate 17 to slide upwards within the oil supply pipe 16, squeezing the lubricating oil in the oil supply pipe 16 into the oil delivery pipe 14. After the lubricating oil enters the oil delivery pipe 14, the oil spray hole 15 on one side sprays into the cylinder wall groove to lubricate the piston plate 3 and the cylinder wall groove. The oil spray hole 15 on the inner side acts on the position through which the piston rod 4 passes in the cylinder head 1 to lubricate the piston rod 4 and the cylinder head 1, thereby achieving comprehensive lubrication. The oil mist spraying is controlled by manually operating the handle 19. The operator can push the handle 19 in a timely and appropriate manner according to the actual situation to avoid spraying too much oil mist at once, which would affect the power of the piston plate 3.

[0029] Working principle: When compressed air is introduced into the air inlet of the hot runner cylinder, the compressed air pushes the piston plate 3 to slide in the cylinder wall groove. Since the radius of the piston plate 3 is equal to the inner diameter of the cylinder wall groove, and with the cooperation of the sealing ring, good sealing can be ensured, so that the piston plate 3 can stably make linear reciprocating motion. When the piston plate 3 moves, it drives the piston rod 4 to move together, which in turn drives the connecting plate 5 and the connecting rod 6 to move. The connecting rod 6 can drive the positioning plate 7 to slide inside the slide groove 9. Since the thickness of the positioning plate 7 is the same as that of the piston plate 3, and the two are on the same horizontal line, the operator can quickly judge the position of the piston plate 3 in the cylinder wall groove by observing the position of the positioning plate 7 in the slide groove 9. The above-mentioned air inlet is a conventional and essential structure of the cylinder and is not considered as the main innovation of this solution, so it is not elaborated in detail.

[0030] When the piston plate 3 moves, it drives the piston rod 4 to move, and the needle valve 13 also moves accordingly, thereby realizing the opening and closing action of the needle valve 13. After the operator judges the position of the piston plate 3 according to the positioning plate 7, he can accurately control the opening and closing degree of the needle valve 13. When the needle valve 13 needs to be replaced, the mounting block 12 can be removed from the inside of the threaded groove 11.

[0031] During lubrication, valve 21 is opened, and handle 19 is pulled, causing circular plate 17 to move downward along support rod 18. Lubricating oil from the external lubricating oil storage tank can flow into oil delivery pipe 16 through oil inlet pipe 20. After taking in an appropriate amount of lubricating oil, valve 21 is closed to stop the delivery of lubricating oil. Then, when the operator pushes handle 19 upward, support rod 18 causes circular plate 17 to slide upward within oil delivery pipe 16, squeezing the lubricating oil in oil delivery pipe 16 into oil supply pipe 14. When the lubricating oil enters oil supply pipe 14, the oil spray hole 15 on one side sprays into the cylinder wall groove to lubricate the piston plate 3 and the cylinder wall groove. The oil spray hole 15 on the inner side acts on the position through which the piston rod 4 passes in cylinder head 1 to lubricate the piston rod 4 and the cylinder head 1, thereby achieving comprehensive lubrication. The oil mist spray is controlled by manually operating handle 19. The operator can push handle 19 at the appropriate time and in the appropriate amount according to the actual situation to avoid spraying too much oil mist at once, which would affect the power of piston plate 3.

[0032] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A hot runner cylinder structure, characterized in that: The cylinder head (1) is symmetrically arranged in two parts. A cylinder body (2) is installed between the two cylinder heads (1). A fixing rod (10) is installed at each of the four corners between the cylinder heads (1). A cylinder wall groove is opened inside the cylinder body (2). A piston plate (3) is slidably installed inside the cylinder wall groove in cooperation with a sealing ring. The radius of the piston plate (3) is equal to the inner diameter of the cylinder wall groove. A piston rod (4) is installed on one side of the piston plate (3). One end of the piston rod (4) slides through and extends to one side of one of the cylinder heads (1). A connecting plate (5) is installed at one end of the piston rod (4). A connecting rod (6) is installed on one side of the top of the connecting plate (5). A positioning plate (7) is installed at one end of the connecting rod (6). An mounting plate (8) is installed between the two sides of the top of the cylinder head (1). A sliding groove (9) is opened inside the mounting plate (8). The positioning plate (7) is slidably installed inside the sliding groove (9).

2. The hot runner cylinder structure according to claim 1, characterized in that: One end of the piston rod (4) passes through the connecting plate (5) and has a threaded groove (11). The threaded groove (11) is threaded with an installation block (12). A needle valve (13) is installed on one side of the installation block (12).

3. The hot runner cylinder structure according to claim 2, characterized in that: One of the cylinder heads (1) has an oil supply pipe (14) installed inside. The oil supply pipe (14) is arranged in a ring inside the cylinder head (1). The cross-section of the oil supply pipe (14) is composed of a circle and a rectangle. Several oil injection holes (15) are opened on the inner side and one side of the oil supply pipe (14). The oil injection hole (15) on one side is connected to the cylinder wall groove, and the oil injection hole (15) on the inner side acts on the position through which the piston rod (4) passes in the cylinder head (1).

4. The hot runner cylinder structure according to claim 3, characterized in that: The bottom side of the oil supply pipe (14) is connected to an oil delivery pipe (16), which passes through the cylinder head (1). A circular plate (17) is slidably installed inside the oil delivery pipe (16). The radius of the circular plate (17) is equal to the inner diameter of the oil delivery pipe (16). A support rod (18) is installed on the bottom side of the circular plate (17). The bottom end of the support rod (18) extends to the outside of the oil delivery pipe (16) and is fitted with a handle (19).

5. A hot runner cylinder structure according to claim 4, characterized in that: The top end of the oil delivery pipe (16) is connected to an oil inlet pipe (20), one end of which can be connected to an external lubricating oil storage tank, and a valve (21) is installed inside the oil inlet pipe (20).

6. The hot runner cylinder structure according to claim 1, characterized in that: The thickness of the positioning plate (7) is the same as the thickness of the piston plate (3), and the positioning plate (7) and the piston plate (3) are on the same horizontal line.

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