Hot runner cylinder structure

Abstract

The utility model belongs to the technical field of hot runners, and particularly relates to a hot runner cylinder structure. The bottom and the top of the cylinder body are communicated, so that the height of the cylinder body is reduced, the sealing position is changed according to the reduced height of the cylinder body, and the position of an air inlet system for driving a piston to move is adjusted, so that the problems in the prior art are solved. Comprising a template for accommodating a hot runner cylinder structure, a sealing ring I is arranged between a cylinder cover and the template, a sealing ring II is arranged between the inner wall of a through hole and the outer wall of a piston, a sealing ring III is arranged between the outer wall of a cylinder body wall and the inner wall of a cavity I, and a sealing ring IV is arranged between the inner wall of a cavity II and the outer wall of an upper piston of the piston. The height of the cylinder body is further reduced, the bottom and the top of the cylinder body communicate with each other, only the movable space height of the piston is reserved, the sealing position of an existing cylinder body is adjusted, and one seal is moved outwards to the position of a template in cooperation with reduction of the height of the cylinder body.

Description

Technical Field

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

[0002] At present, the cylinder components used in the needle valve hot runner system include electric cylinders, air cylinders, and hydraulic cylinders. Among them, electric cylinders have certain advantages over hydraulic cylinders and air cylinders, but they have certain disadvantages in price, and their usage is limited so far. In the hot runner system, most of them still use oil cylinders and air cylinders to drive the valve needle. The oil cylinder and air cylinder drive the piston to drive the valve needle to make reciprocating linear motion through hydraulic oil and compressed air respectively. As the main component of the needle valve system, the cylinder has a very high usage rate. However, due to structural reasons, there are strict requirements on the thickness of the template, and the thickness of the template cannot be less than the minimum thickness. Due to the cost of the template and the height limit requirements of the injection molding machine, customers hope to compress the thickness of the template, one is to save costs, and the other is to meet the height limit requirements of the injection molding machine. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a hot runner cylinder structure, which connects the bottom and top of the cylinder body to each other so as to reduce the height of the cylinder body, changes the sealing position according to the lowered cylinder body height, and adjusts the position of the intake system that drives the piston movement to solve the problems in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A hot runner cylinder structure comprises a template for accommodating the hot runner cylinder structure, the template is provided with a chamber I and a chamber II which are connected to each other, the outer wall of the chamber I is connected with an air inlet passage I and an air inlet passage II, a cylinder body is provided in the chamber I, a piston is provided in the cylinder body, and a valve needle is provided in the piston; the cylinder body comprises a cylinder body wall and a through hole, the through hole is connected with the chamber I and the chamber II, a cylinder head is provided at the bottom of the cylinder body, and the cylinder head is installed at the bottom of the template; an airway area I is formed between the outer wall of the cylinder body wall and the inner wall of the chamber I, and the airway area I is connected with the air inlet passage I; an airway area II is formed between the through hole and the chamber I, and the airway area II is connected with the air inlet passage II; a sealing ring I is provided between the cylinder head and the template, a sealing ring II is provided between the inner wall of the through hole and the outer wall of the piston, a sealing ring III is provided between the outer wall of the cylinder body wall and the inner wall of the chamber I, and a sealing ring IV is provided between the inner wall of the chamber II and the outer wall of the upper piston of the piston.

[0006] Furthermore, a sealing groove I corresponding to sealing ring I is provided in chamber I; a sealing groove II corresponding to sealing ring II is provided on the outer wall of the lower piston of the piston; a sealing groove III corresponding to sealing ring III is provided on the outer wall of the cylinder wall; and a sealing groove IV corresponding to sealing ring IV is provided in chamber II.

[0007] Furthermore, a gasket groove is provided in the chamber II, a sealing ring gasket is provided in the gasket groove, and the upper piston partially penetrates into the gasket through hole of the sealing ring gasket; the sealing ring gasket, the sealing groove IV and the upper piston form a sealing ring IV limiting area.

[0008] Furthermore, the cylinder head is provided with a frustum, a recessed groove, and a fixed platform in sequence from the center point to the outer circumference on the side facing the template, and the frustum is flush with the top surface of the fixed platform; the fixed platform is provided with a screw hole, and a cup head screw is installed in the screw hole to be fixed to the template; the frustum is in contact with the bottom of the lower piston, and the diameter of the frustum is larger than the diameter of the nut mounting groove of the lower piston; the recessed groove is connected to the airway area I to drive the piston.

[0009] Furthermore, the valve needle hanging platform of the valve needle is installed in the hanging platform groove of the piston, a valve needle pressing block is installed in the pressing block groove to press the valve needle hanging platform, and an adjusting nut is installed in the nut installation groove to press the valve needle pressing block.

[0010] Furthermore, the external thread of the adjusting nut is threadedly connected with the internal thread in the nut mounting groove, and the abutting portion of the adjusting nut is driven to abut and fix the valve needle pressing block by rotating the internal hexagonal hole.

[0011] Furthermore, the airway zone I and the airway zone II are two independent airway zones, and the air entering through the airway zone I pushes the piston toward the airway zone II, and the air entering through the airway zone II pushes the piston toward the airway zone I.

[0012] Furthermore, the air entering the airway area I is sealed by the sealing rings III, II and I; the air entering the airway area II is sealed by the sealing rings II and IV.

[0013] Furthermore, the cross section of the cylinder body is annular, and the through hole passes through the cylinder body.

[0014] A method for installing a hot runner cylinder structure comprises the following steps:

[0015] S1. Install the sealing ring IV into the sealing groove IV. The sealing ring gasket enters from the chamber II and engages in the gasket groove. At this time, the sealing ring IV is fixed in the limited area.

[0016] S2. The cylinder body is installed in the chamber Ⅰ, and the sealing ring Ⅲ is installed in advance in the sealing groove Ⅲ; the cylinder body matching surface Ⅰ is matched and abutted with the template matching surface Ⅰ, and the cylinder body matching surface Ⅱ and the cylinder body matching surface Ⅲ are matched and abutted with the template matching surface Ⅱ; the cylinder body matching surface Ⅱ and the cylinder body matching surface Ⅲ and the template matching surface Ⅱ jointly seal the sealing groove Ⅲ and cooperate with the sealing ring Ⅲ to seal;

[0017] S3. The piston enters the cylinder directly from the through hole, and the sealing ring II is installed in the sealing groove II in advance; the valve needle enters from the nut installation groove until the valve needle hanging platform reaches the hanging platform groove, and the valve needle pressing block is continuously installed until it reaches the pressing block groove and presses the valve needle hanging platform tightly, and the adjusting nut is continuously installed until it is threadedly connected in the nut installation groove, and the inner hexagon hole is rotated to drive the abutting part of the adjusting nut to press against the valve needle pressing block tightly;

[0018] S4. Install the sealing ring Ⅰ into the sealing groove Ⅰ, and tighten the cylinder head cover to the bottom of the template with the cup head screw;

[0019] S5. When disassembling or replacing the valve needle, you only need to remove the cylinder head, adjusting nut and valve needle pressing block.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. Compared with the existing cylinder body, the present application further lowers the height of the cylinder body, and makes the bottom and the top of the cylinder body connected, leaving only the space height for the piston to move. The sealing position of the existing cylinder body is adjusted, and one seal is moved outward to the template position in conjunction with the reduction of the cylinder body height; the existing outer piston and inner piston are simplified into an integrated piston to match the cylinder body of the present application; the sealing ring IV cooperates with the template to replace the existing sealing method between the cylinder body and the upper piston, so that the height of the cylinder body can be reduced.

[0022] 2. After the height of the cylinder body is lowered, the sealing structure of the existing cylinder body is changed by adding a sealing structure between the upper piston and chamber II, which is tightened and fixed by a sealing ring gasket; at the same time, the positions of the intake duct I and the intake duct II are changed; the air duct area I and the air duct area II are two independent air duct areas, which are not interconnected; the air supplied by the intake duct I enters the air duct area I to push the piston toward the air duct area II, thereby driving the valve needle out, and the air supplied by the intake duct II enters the air duct area II to push the piston toward the air duct area I, thereby driving the valve needle back.

[0023] 3. An annular groove is formed on the side of the cylinder head facing the cylinder body. The piston is installed in a contact cone by default. A gas gathering area is formed between the groove, the piston and the cylinder body to push the piston to gather gas. The pushing space of the piston in the cylinder body is the distance between the side of the lower piston facing chamber II and the template matching surface I in chamber I. This distance satisfies the movement space of the piston.

[0024] 4. The limited area provides a certain displacement space for the sealing ring IV, and the displacement will not affect the sealing performance; specifically, when the piston moves, the upper piston slides in the chamber. In order to ensure the sealing performance and sliding smoothness, a certain space limited area is provided for the sealing ring IV. The back and forth sliding of the upper piston drives the sealing ring IV from one side to the other side, or from the other side to one side, within the limited area. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 This is a schematic diagram of the cylinder head structure of the utility model;

[0027] Figure 3 This is a schematic diagram of the cylinder structure of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the adjusting nut of the utility model;

[0029] Figure 5 This is a schematic diagram of the piston structure of the utility model;

[0030] Figure 6 This is a schematic diagram of the template structure of the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention but merely represents selected embodiments of the present invention.

[0033] Based on the implementations in the utility model, all other implementations obtained by ordinary technicians in the field under the instructions before making creative work are within the scope of protection of the utility model.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0037] like Figure 1 , 2 , 3, 4, 5, 6 as shown:

[0038] A hot runner cylinder structure, comprising a template 2 for accommodating the hot runner cylinder structure, the template 2 is provided with a chamber Ⅰ21 and a chamber Ⅱ22 which are connected to each other, the outer wall of the chamber Ⅰ21 is connected with an air inlet Ⅰ26 and an air inlet Ⅱ27, a cylinder body 3 is provided in the chamber Ⅰ21, a piston 5 is provided in the cylinder body 3, and a valve needle 7 is provided in the piston 5; the cylinder body 3 comprises a cylinder body wall 31 and a through hole 32, the through hole 32 is connected with the chamber Ⅰ21 and the chamber Ⅱ22, a cylinder head 1 is provided at the bottom of the cylinder body 3, and the cylinder head 1 is installed at the bottom of the template 2; the cross section of the cylinder body 3 is annular, the through hole 32 runs through the cylinder body 3, the base of the existing cylinder body is subtracted, the cylinder body is penetrated as a whole, and only the minimum space sufficient for the piston to move is reserved, thereby reducing the height of the cylinder body to the minimum value; the outer wall of the cylinder body wall 31 An airway area I28 is formed with the inner wall of the chamber I21, and the airway area I28 is connected to the intake passage I26; an airway area II29 is formed between the through hole 32 and the chamber I21, and the airway area II29 is connected to the intake passage II27; a sealing ring I91 is provided between the cylinder head 1 and the template 2 to seal the cylinder head 1 and the template 2, a sealing ring II92 is provided between the inner wall of the through hole 32 and the outer wall of the piston 5 to achieve independent sealing of the sealed airway area I28 and the airway area II29 when the piston 5 is running, a sealing ring III93 is provided between the outer wall of the cylinder wall 31 and the inner wall of the chamber I21 to ensure the independent sealing of the airway area I28, and a sealing ring IV94 is provided between the inner wall of the chamber II22 and the outer wall of the upper piston 55 of the piston 5 to ensure the independent sealing of the airway area II29. There is only one sealing strip installation position on the cylinder body 3 to reduce the height of the cylinder body 3.

[0039] Further, a sealing groove I23 corresponding to the sealing ring I91 is provided in the chamber I21; a sealing groove II54 corresponding to the sealing ring II92 is provided on the outer wall of the lower piston 53 of the piston 5; a sealing groove III33 corresponding to the sealing ring III93 is provided on the outer wall of the cylinder wall 31; and a sealing groove IV24 corresponding to the sealing ring IV94 is provided in the chamber II22. The sealing ring I91, the sealing ring II92, and the sealing ring III93 are located in the chamber I21 of the template 2, and the sealing ring IV94 is located in the chamber II22 of the template 2. By changing the sealing ring structure and cooperating with reducing the cylinder height, compared with the existing cylinder height and the corresponding sealing structure, the change in the position of the sealing ring IV94 of the utility model is crucial to obtain the cylinder height reduction of the utility model and meet the operating conditions at the same time.

[0040] Furthermore, a gasket groove 25 is provided in the chamber II 22, and a sealing ring gasket 8 is provided in the gasket groove 25.

[0041] The upper piston 55 partially penetrates into the pad through hole of the sealing ring pad 8; the sealing ring pad 8, the sealing groove IV24, and the upper piston 55 form a sealing ring IV94 limiting area 10. The sealing ring IV94 is separated from the cylinder seal, and a new structural method is adopted for the sealing ring IV94 and the upper piston 55 to cooperate. Considering that the piston 5 will drive the sealing ring IV94 to move when it is running, the sealing ring IV94 is pressed and fixed by the sealing ring pad 8. The sealing groove IV24 and the pad groove 25 are stepped in structure, and the limiting area 10 is formed to ensure the sealing effect and displacement space.

[0042] Furthermore, a truncated cone 11, a sink 12, and a fixing platform 13 are sequentially provided on the side of the cylinder head 1 facing the template 2 from the center point to the outer circumference, and the truncated cone 11 is flush with the top surface of the fixing platform 13; a side of the cylinder wall 31 facing the cylinder head 1 is flush with the surface of the template 2 that matches the fixing platform 13; the outer diameter of the sink 12 is larger than the diameter of the cylinder body 3, and the difference between the two diameters leaves a gas inlet channel, so that the gas enters the sink 12; the fixing platform 13 is provided with a screw hole 14, and a cup head screw 15 is installed in the screw hole 14 to fix it on the template 2;

[0043] The truncated cone 11 contacts the bottom of the lower piston 53, and the diameter of the truncated cone 11 is larger than the diameter of the nut mounting groove 52 of the lower piston 53; the sinking groove 12 is connected to the airway area I28 to drive the piston 5, and the depth of the sinking groove 12 can be designed according to needs.

[0044] Furthermore, the valve needle hanging platform of the valve needle 7 is installed in the hanging platform groove 57 of the piston 5, the valve needle pressing block 6 is installed in the pressing block groove 56 to press the valve needle hanging platform, and the adjusting nut 4 is installed in the nut installation groove 52 to press the valve needle pressing block 6. The external thread 42 of the adjusting nut 4 is threadedly connected with the internal thread 51 in the nut installation groove 52, and the abutting portion 43 of the adjusting nut 4 is driven to abut and fix with the valve needle pressing block 6 by rotating the internal hexagonal hole 41.

[0045] Further, the airway area I28 and the airway area II29 are two independent airway areas, and the air entering through the airway area I28 pushes the piston 5 toward the airway area II29, and the air entering through the airway area II29 pushes the piston 5 toward the airway area I28. The air inlet I26 and the air inlet II27 are located on the same side of the template 2 and are both connected to the chamber I21.

[0046] It is assumed that the air ducts I 26 and II 27 entering the chamber I 21 are further extended and the two are in a 90° vertical relationship.

[0047] Furthermore, the air entering the airway area Ⅰ28 has its flow area sealed by the sealing rings Ⅲ93, Ⅱ92 and Ⅰ91; the air entering the airway area Ⅱ29 has its flow area sealed by the sealing rings Ⅲ93, Ⅱ92 and Ⅳ94.

[0048] A method for installing a hot runner cylinder structure comprises the following steps:

[0049] S1, install the sealing ring IV 94 into the sealing groove IV 24, and the sealing ring gasket 8 enters from the chamber II 22 and engages in the gasket groove 25, at which time the sealing ring IV 94 is fixed in the limited area 10;

[0050] S2, the cylinder body 3 is installed in the chamber Ⅰ21, and the sealing ring Ⅲ93 is installed in the sealing groove Ⅲ33 in advance; the cylinder body matching surface Ⅰ34 is matched and abutted with the template matching surface Ⅰ210, and the cylinder body matching surface Ⅱ35 and the cylinder body matching surface Ⅲ36 are matched and abutted with the template matching surface Ⅱ211; the cylinder body matching surface Ⅱ35 and the cylinder body matching surface Ⅲ36 and the template matching surface Ⅱ211 jointly seal the sealing groove Ⅲ33 with the sealing ring Ⅲ93;

[0051] S3, the piston 5 directly enters the cylinder body 3 from the through hole 32, and the sealing ring II 92 is installed in the sealing groove II 54 in advance;

[0052] The valve needle 7 enters from the nut installation groove 52 until the valve needle hanging platform reaches the hanging platform groove 57, and the valve needle pressing block 6 is continuously installed until it reaches the pressing block groove 56 to press the valve needle hanging platform, and the adjusting nut 4 is continuously installed to the internal thread connection of the nut installation groove 52, and the internal hexagonal hole 41 is rotated to drive the abutting part 43 of the adjusting nut 4 to abut and press the valve needle pressing block 6;

[0053] S4, the sealing ring Ⅰ91 is installed in the sealing groove Ⅰ23, and the cylinder head 1 is covered on the bottom of the template 2 and locked and fixed by the cup head screw 15;

[0054] S5. When disassembling and replacing the valve needle 7, it is only necessary to remove the cylinder head 1, the adjusting nut 4 and the valve needle pressing block 6.

[0055] When in use, during the injection molding process, gas enters the gas through the air inlet duct Ⅰ26, and the gas enters the sink 12 along the airway area Ⅰ28. The pressure generated causes the piston 5 to drive the valve needle 7 to move downward at the same time, so that the valve needle 7 enters the core gate to seal the glue and stop the glue discharge; the air intake through the air inlet duct Ⅱ27 causes the piston 5 to drive the valve needle 7 to retreat, and at the same time, the gas stored in the upper part of the piston 5 is discharged, the gate is opened to start feeding and injection molding, and the injection molding is completed in a cycle.

[0056] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited by the above-mentioned embodiments. Those skilled in the art may make various modifications or variations to the utility model without departing from the technical concept of the utility model, and these modifications or variations certainly fall within the scope of protection of the utility model.

Claims

1. A hot runner cylinder structure, characterized in that: The invention comprises a template (2) for accommodating a hot runner cylinder structure, the template (2) being provided with a chamber I (21) and a chamber II (22) which are connected to each other, the outer wall of the chamber I (21) being connected with an air inlet passage I (26) and an air inlet passage II (27), a cylinder body (3) being provided in the chamber I (21), a piston (5) being provided in the cylinder body (3), and a valve needle (7) being provided in the piston (5); The cylinder body (3) comprises a cylinder body wall (31) and a through hole (32), wherein the through hole (32) is in communication with chamber I (21) and chamber II (22), and a cylinder head (1) is provided at the bottom of the cylinder body (3), wherein the cylinder head (1) is mounted on the bottom of the template (2); An airway region I (28) is formed between the outer wall of the cylinder wall (31) and the inner wall of the chamber I (21), and the airway region I (28) is in communication with the air inlet channel I (26); The through hole (32) and the chamber I (21) form an airway area II (29), and the airway area II (29) is connected to the air inlet II (27); A sealing ring I (91) is provided between the cylinder head (1) and the template (2), a sealing ring II (92) is provided between the inner wall of the through hole (32) and the outer wall of the piston (5), a sealing ring III (93) is provided between the outer wall of the cylinder wall (31) and the inner wall of the chamber I (21), and a sealing ring IV (94) is provided between the inner wall of the chamber II (22) and the outer wall of the upper piston (55) of the piston (5).

2. The hot runner cylinder structure according to claim 1, characterized in that: The chamber I (21) is provided with a sealing groove I (23) corresponding to the sealing ring I (91); The outer wall of the lower piston (53) of the piston (5) is provided with a sealing groove II (54) corresponding to the sealing ring II (92); The outer wall of the cylinder wall (31) is provided with a sealing groove III (33) corresponding to the sealing ring III (93); A sealing groove IV (24) corresponding to the sealing ring IV (94) is provided in the chamber II (22).

3. The hot runner cylinder structure according to claim 1, characterized in that: The chamber II (22) is provided with a gasket groove (25), and a sealing ring gasket (8) is provided in the gasket groove (25). The upper piston (55) partially penetrates into the pad through hole of the sealing ring pad (8); The sealing ring gasket (8), the sealing groove IV (24) and the upper piston (55) form a sealing ring IV (94) limiting area (10).

4. The hot runner cylinder structure according to claim 1, characterized in that: The cylinder head (1) is provided with a truncated platform (11), a sink (12), and a fixed platform (13) in sequence from the center point to the outer circumference on the side facing the template (2), and the top surfaces of the truncated platform (11) and the fixed platform (13) are flush; The fixing platform (13) is provided with a screw hole (14), and a cup head screw (15) is installed in the screw hole (14) to be fixed on the template (2); The truncated cone (11) contacts the bottom of the lower piston (53), and the diameter of the truncated cone (11) is larger than the diameter of the nut mounting groove (52) of the lower piston (53); The sink (12) is connected to the airway area I (28) to drive the piston (5).

5. The hot runner cylinder structure according to claim 1, characterized in that: The valve needle hanging platform of the valve needle (7) is installed in the hanging platform groove (57) of the piston (5), the valve needle pressing block (6) is installed in the pressing block groove (56) to press the valve needle hanging platform, and the adjusting nut (4) is installed in the nut installation groove (52) to press the valve needle pressing block (6).

6. The hot runner cylinder structure according to claim 5, characterized in that: The external thread (42) of the adjusting nut (4) is threadedly connected to the internal thread (51) in the nut mounting groove (52), and the abutting portion (43) of the adjusting nut (4) is driven to abut and fix the valve needle pressing block (6) by rotating the internal hexagonal hole (41).

7. The hot runner cylinder structure according to claim 1, characterized in that: The airway zone I (28) and the airway zone II (29) are two independent airway zones. The air entering through the airway zone I (28) pushes the piston (5) toward the airway zone II (29), and the air entering through the airway zone II (29) pushes the piston (5) toward the airway zone I (28).

8. The hot runner cylinder structure according to claim 7, characterized in that: The air entering the airway area I (28) is sealed by the sealing ring III (93), the sealing ring II (92), and the sealing ring I (91); The gas entering the airway area II (29) is sealed by the sealing ring II (92) and the sealing ring IV (94).

9. The hot runner cylinder structure according to claim 1, characterized in that: The cross section of the cylinder body (3) is annular, and the through hole (32) passes through the cylinder body (3).

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