Air cylinder and hot runner system

Abstract

The utility model belongs to the technical field of hot runner injection molding, and discloses an air cylinder and a hot runner system. The air cylinder comprises a cylinder body, a cylinder base, a piston, a valve needle, an adjusting piece and a pressing jig. A through hole is formed in the cylinder body; the cylinder base is arranged at the bottom end of the cylinder body, a containing cavity is formed in the cylinder base, and the through hole communicates with the containing cavity; the piston is arranged in the containing cavity, the bottom end of the skirt portion of the piston abuts against the inner bottom face of the cylinder base, and a valve needle channel is formed in the piston in the axial direction of the piston. The valve needle is arranged in the valve needle channel; one end of the adjusting piece is connected with the top end of the valve needle, the other end of the adjusting piece is provided with a screwing part, and the adjusting piece can drive the valve needle to ascend or descend in the valve needle channel when the screwing part is rotated; one end of the press-fit jig penetrates through the through hole and abuts against the top end of the skirt portion, the other end of the press-fit jig is hung to the top end of the cylinder body, an adjusting hole communicated with the valve needle channel is formed in the press-fit jig in the axial direction of the press-fit jig, and the adjusting piece can be rotated through the adjusting hole. The pressing jig fixes the piston, the glue sealing effect is guaranteed, and the height of the valve needle can be adjusted through the adjusting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner injection molding, in particular to a cylinder and a hot runner system. Background Art

[0002] The hot runner system is widely used in injection molds. In the hot runner system, the needle valve type hot runner system uses a cylinder block to drive the needle valve to open and close to realize injection, sealing and cutting off the material head. In actual application, since the hot runner is continuously heated to keep the material injected into the mold cavity in a molten state all the time; the cylinder block is installed on the heated manifold plate, and the piston and the cylinder block cooperate with each other to reciprocate during injection molding production. In this way, a large amount of heat is generated due to the reciprocating movement of the cylinder block, and the heat dissipation effect of the cylinder block is poor, which seriously affects the service life of the needle valve and various components of the cylinder block. When the needle valve is damaged during use and needs to be replaced, the upper fixing plate of the mold needs to be removed, then the cylinder is removed from the manifold plate, and then the cylinder is disassembled for maintenance and replacement. The maintenance work is cumbersome, the operation is inconvenient, the heat dissipation effect is poor, and at the same time, the height of the needle valve cannot be adjusted in the sealing state, which may seriously affect the production efficiency.

[0003] Therefore, there is an urgent need for a cylinder and a hot runner system to solve the problems of the height of the needle valve in the sealing state and the poor heat dissipation effect. Summary of the Utility Model

[0004] An object of the utility model is to provide a cylinder to solve the problem that the height of the needle valve cannot be adjusted or is inconvenient to adjust.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A cylinder, comprising:

[0007] A cylinder block provided with a through hole;

[0008] A cylinder seat disposed at the bottom end of the cylinder block, an accommodation cavity is formed in the cylinder seat, and the through hole communicates with the accommodation cavity;

[0009] A piston disposed in the accommodation cavity, the bottom end of the skirt portion of the piston abuts against the inner bottom surface of the cylinder seat, and a needle valve channel is axially disposed inside the piston;

[0010] A needle valve disposed in the needle valve channel;

[0011] An adjusting member, one end of which is connected to the top end of the needle valve, and the other end is provided with a screwing portion. When the screwing portion is rotated, the adjusting member can drive the needle valve to rise or fall in the needle valve channel;

[0012] The pressing fixture has one end passing through the through hole and abutting against the top end of the skirt portion, and the other end hanging to the top end of the cylinder block. The pressing fixture is axially provided with an adjustment hole communicating with the valve needle channel, and the adjusting member can be rotated through the adjustment hole.

[0013] Preferably, the pressing fixture includes a hanging portion and a main body portion connected coaxially. The diameter of the hanging portion is larger than that of the main body portion. The main body portion extends into the accommodating cavity and abuts against the top end of the skirt portion. A limiting groove is provided at the top end of the cylinder block, and the limiting groove can accommodate the hanging portion.

[0014] Preferably, the distance between the bottom end surface of the hanging portion and the top end surface of the skirt portion is greater than the distance between the bottom surface of the limiting groove and the top end surface of the skirt portion, so as to form a gap between the bottom end surface of the hanging portion and the bottom surface of the limiting groove.

[0015] Preferably, the hanging portion and the cylinder block are detachably connected by a locking member.

[0016] Preferably, an installation groove is further designed in the limiting groove, and the installation groove is used for installing a sealing member.

[0017] Preferably, a fixing member is further provided in the valve needle channel. A sealing member is provided between the fixing member and the side wall of the valve needle channel. The bottom end of the fixing member abuts against the top end of the adjusting member, and the fixing member is threadedly connected to the inner side wall of the valve needle channel.

[0018] Preferably, an indication mark is designed on the adjusting member, and a scale value is designed on the piston. The indication mark can be aligned with one of the scale values.

[0019] Another object of the present utility model is to provide a hot runner system to ensure good heat dissipation effect.

[0020] To achieve this object, the present utility model adopts the following technical solutions:

[0021] The hot runner system includes a manifold plate, a support plate, and any one of the cylinders as described above. The support plate is detachably connected to the bottom end of the cylinder, and the support plate is detachably connected to the manifold plate. The valve needle communicates with the flow dividing channel in the manifold plate.

[0022] Preferably, fixing plates are further spaced apart at the top end of the cylinder. Heat dissipation holes are provided on the fixing plates, and the heat dissipation holes are aligned with the cylinder.

[0023] Preferably, the aperture of the heat dissipation hole is 1 mm - 3 mm.

[0024] The beneficial effects of the present utility model:

[0025] The utility model discloses a cylinder. The cylinder includes a cylinder block, a cylinder base, a piston, a valve needle, an adjusting member, and a pressing fixture. The cylinder block is provided with a through hole; the cylinder base is arranged at the bottom end of the cylinder block, and a receiving cavity is formed in the cylinder base, and the through hole communicates with the receiving cavity; the piston is arranged in the receiving cavity, the bottom end of the skirt portion of the piston abuts against the inner bottom surface of the cylinder base, and a valve needle channel is arranged axially inside the piston; the valve needle is arranged in the valve needle channel; one end of the adjusting member is connected to the top end of the valve needle, and the other end is provided with a screwing portion. When the screwing portion is rotated, the adjusting member can drive the valve needle to rise or fall in the valve needle channel; one end of the pressing fixture penetrates through the through hole and abuts against the top end of the skirt portion, and the other end is suspended at the top end of the cylinder block. An adjustment hole communicating with the valve needle channel is arranged axially on the pressing fixture, and the adjusting member can be rotated through the adjustment hole.

[0026] The pressing fixture fixes the piston, thereby ensuring the sealing effect. At the same time, the operator can extend the workpiece from the adjustment hole into the valve needle channel and adjust the height of the valve needle by rotating the adjusting member, which can be achieved without disassembling the cylinder, and the operation is simple and practical.

[0027] This embodiment also provides a hot runner system. Applying the above cylinder, while ensuring that the height of the valve needle can be adjusted, the heat dissipation efficiency can also be improved. Description of the Drawings

[0028] Figure 1 is the cross-section of the hot runner system provided by the utility model Figure 1 ;

[0029] Figure 2 is the cross-section of the hot runner system provided by the utility model Figure 2 .

[0030] In the figure:

[0031] 10. Cylinder block; 11. Installation groove;

[0032] 20. Cylinder base; 21. Receiving cavity;

[0033] 30. Piston; 31. Skirt portion;

[0034] 40. Valve needle;

[0035] 50. Adjusting member; 51. Screwing portion;

[0036] 60. Pressing fixture; 61. Adjustment hole; 62. Suspension portion; 63. Main body portion;

[0037] 70. Locking member;

[0038] 80. Sealing member;

[0039] 90. Fixing member;

[0040] 100, Manifold Plate; 110, Runner

[0041] 200, Fixed Plate; 210, Heat Dissipation Holes

[0042] 300, Support Plate

[0043] 400, Inlet Pipe

[0044] 500, Outlet Pipe

[0045] 600, Cooling Pipe

[0046] 700, Cylinder Head Detailed Embodiment

[0047] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are merely for explaining the present utility model and not for limiting it. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0048] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below and under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal height than the second feature.

[0050] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0051] In this embodiment, a hot runner system is provided. As Figure 1 and Figure 2 shown, the hot runner system includes a manifold 100, a support plate 300, and a cylinder. The support plate 300 is detachably connected to the bottom end of the cylinder, and the support plate 300 is detachably connected to the manifold 100. The valve pin 40 communicates with the flow channel 110 inside the manifold 100. This hot runner system intakes air through the air inlet pipe 400 and discharges air through the air outlet pipe 500, so that the valve pin 40 reciprocates axially inside the cylinder and completes the glue discharging. During this process, since the temperature of the colloid is relatively high, the bottom of the cylinder is cooled by the cooling pipe 600, thereby ensuring good heat dissipation efficiency. The detachable connection also facilitates the subsequent maintenance and replacement of parts.

[0052] In addition, as Figure 1 and Figure 2 shown, a fixing plate 200 is also spacedly arranged at the top end of the cylinder. The fixing plate 200 is provided with heat dissipation holes 210, and the heat dissipation holes 210 are opposite to the cylinder, so as to ensure that the heat generated by the reciprocating movement of the valve pin 40 inside the cylinder can be quickly dissipated, thereby ensuring good heat dissipation effect and avoiding equipment damage caused by excessive heat. It should be noted here that when the aperture of the heat dissipation holes 210 is 1 mm - 3 mm, the heat dissipation effect is the best. If the aperture is too large, it may cause excessive heat dissipation and the glue cannot be discharged normally. In this embodiment, the aperture of the heat dissipation holes 210 is 2.5 mm. In other embodiments, the aperture of the heat dissipation holes 210 can be adjusted according to actual needs, and no other limitations are made in this example.

[0053] However, in the hot runner systems of the prior art, the service life of the valve pin 40 is relatively short and it needs to be replaced in time. However, the replacement process is relatively cumbersome, and when there is a deviation in the installation height of the valve pin 40, it will cause poor glue discharging effect, reduced production efficiency, and in severe cases, equipment damage. To solve this technical problem, this example also provides a cylinder.

[0054] As Figure 1As shown in the figure, the cylinder includes a cylinder block 10, a cylinder base 20, a piston 30, a valve needle 40, an adjusting member 50, and a pressing fixture 60. Specifically, the cylinder block 10 is provided with a through hole; the cylinder base 20 is arranged on the base of the cylinder block 10, and a receiving cavity 21 is formed inside the cylinder base 20, and the through hole communicates with the receiving cavity 21; the piston 30 is arranged in the receiving cavity 21, the bottom end of the skirt 31 of the piston 30 abuts against the inner bottom surface of the cylinder base 20, and a valve needle channel is arranged axially inside the piston 30; the valve needle 40 is arranged in the valve needle channel, one end of the adjusting member 50 is connected to the top end of the valve needle 40, and the other end is provided with a screwing part 51. When the screwing part 51 is rotated, the adjusting member 50 can drive the valve needle 40 to rise or fall in the valve needle channel; one end of the pressing fixture 60 penetrates through the through hole and abuts against the top end of the skirt 31, and the other end is suspended to the top end of the cylinder block 10. An adjustment hole 61 communicating with the valve needle channel is arranged axially on the pressing fixture 60, and the adjustment hole 61 can rotate the adjusting member 50.

[0055] In the above structure, one end of the pressing fixture 60 abuts against the top end of the cylinder block 10, and the other end abuts against the top end of the skirt 31 of the piston 30, that is, the pressing fixture 60 presses the piston 30 onto the inner bottom surface of the cylinder base 20. At this time, the piston 30 does not move and maintains the sealant state; furthermore, since the adjustment hole 61 is provided on the pressing fixture 60, the operator can hold a screwing tool and pass it through the adjustment hole 61 until it reaches the valve needle channel, and use the screwing tool to rotate the screwing part 51, so as to drive the valve needle 40 to rise or fall through the screwing part 51. The operation process is simple and convenient, the height of the valve needle 40 can be adjusted in the sealant state, and the cylinder does not need to be disassembled. It should be noted that in this embodiment, in order to ensure good airtightness, a sealing member 80 is arranged between the piston 30 and the cylinder base 20.

[0056] It should be noted here that in this embodiment, the outer wall of the adjusting member 50 and the inner wall of the corresponding valve needle channel are both processed with first threads, and the two are connected by threads. The screwing tool is a hex wrench. When the hex wrench is inserted into the screwing part 51 and screwed, the adjusting member 50 can rotate under the drive of the hex wrench. At this time, the adjusting member 50 will rise or fall along the rotation direction of the threads, and the bottom end of the adjusting member 50 is connected to the top end of the valve needle 40. Furthermore, the adjusting member 50 can drive the valve needle 40 to rise or fall.

[0057] Furthermore, it should be noted that in this embodiment, in order to facilitate observing the height of the valve needle 40 rising or falling, an indication mark is arranged on the adjusting member 50, and a scale value is arranged on the piston 30, and the indication mark can be aligned with a specific scale value. That is, read the initial scale value aligned with the indication mark before adjustment, and read the new scale value aligned with the indication mark again after adjustment. By calculating the difference between the new scale value and the initial scale value, the specific height of the valve needle 40 rising or falling can be judged, and the operation is simple and convenient.

[0058] Furthermore, in order to prevent the valve needle 40 from rushing out of the valve needle channel when the piston 30 drives the valve needle 40 to move, Figure 1 As shown, a fixing member 90 is also provided in the valve needle channel, a sealing member 80 is provided between the fixing member 90 and the side wall of the valve needle channel, the bottom end of the fixing member 90 abuts against the top end of the adjusting member 50, and the fixing member 90 is threadedly connected to the inner side wall of the valve needle channel. In this structure, a sealing member 80 is provided between the fixing member 90 and the valve needle channel, which ensures the sealing effect of the structure, and the fixing member 90 is threadedly connected to the valve needle channel to ensure detachability, so that the operator can easily remove the fixing member 90, and at the same time, when in use, the fixing member 90 can also ensure that the valve needle 40 will not be separated from the valve needle channel.

[0059] It should be noted here that a bolt is provided at the top of the fixing member 90. When the fixing member 90 needs to be removed, the bolt needs to be removed from the fixing member 90 first. At this time, the fixing member 90 is removed from the valve needle channel by inserting a screwing jig into the bolt hole and then continuing to screw the fixing member 90. It should be further noted that in this example, the outer wall of the fixing member 90 and the inner wall of the valve needle channel corresponding to it are both processed with a second screw thread, and the second screw thread is screwed in the opposite direction to the first screw thread. Since the adjusting member 50 and the fixing member 90 may produce a slight rotation when the piston 30 reciprocates, this arrangement can make the adjusting member 50 and the fixing member 90 rotate only in the same direction, that is, the two will move toward each other, and the fixing member 90 and the adjusting member 50 are in contact with each other, thereby ensuring that the two will not be separated from the valve needle channel.

[0060] like Figure 1 As shown, the pressing jig 60 includes a coaxially connected suspension portion 62 and a main body portion 63, the diameter of the suspension portion 62 is larger than the diameter of the main body portion 63, the main body portion 63 extends into the accommodating cavity 21 and abuts against the top of the skirt portion 31, and a limiting groove is provided at the top of the cylinder body 10, and the limiting groove can accommodate the suspension portion 62. The structure of the suspension portion 62 is simple, and there is no need to process other structures on the pressing jig 60. It only needs to be integrally processed with the main body portion 63, which simplifies the processing process. In addition, the limiting groove at the top of the cylinder body 10 can also limit the suspension portion 62 to prevent it from sliding in the horizontal direction.

[0061] like Figure 2 As shown, after the height adjustment of the valve needle 40 is completed, the pressing jig 60 needs to be removed and replaced with the cylinder cover 700 so as to perform the glue discharging work again. Figure 1As shown, the suspension part 62 and the cylinder block 10 are detachably connected by a locking member 70. Such a setting can not only facilitate the disassembly of the press-fitting jig 60, but also when the suspension part 62 is connected to the limiting groove, the main body part 63 can fix the piston 30 on the cylinder seat 20, thus ensuring a good sealing effect. It should be noted here that in this embodiment, the locking member 70 is a bolt, which has a simple structure, low price, is convenient for mass production, and is beneficial to reducing the manufacturing cost.

[0062] However, the problem with such a structure is that when the locking member 70 is required, if the bottom end surface of the suspension part 62 and the bottom surface of the limiting groove are in a tightly fitting state (there is no gap between them), an adsorption effect will be generated on the suspension part 62 at this time, which will make it extremely inconvenient to remove the suspension part 62. To solve this problem, the distance between the bottom end surface of the suspension part 62 and the top end surface of the skirt part 31 is specifically greater than the distance between the bottom surface of the limiting groove and the top end surface of the skirt part 31, so as to form a gap between the bottom end surface of the suspension part 62 and the bottom surface of the limiting groove. Such a structure avoids the tight fitting of the suspension part 62 and the limiting groove, and thus facilitates the removal of the press-fitting jig 60, with strong practicability.

[0063] In addition, as Figure 1 and Figure 2 shown, an installation groove 11 is also provided in the limiting groove, and the installation groove 11 is used to install the sealing member 80. Such a setting can ensure good airtightness of the cylinder after the press-fitting jig 60 is removed and the cylinder head 700 is reinstalled. It should be noted here that in this example, the sealing members 80 are all made of perfluoro rubber material. This material is more heat-resistant than ordinary rubber, so as to ensure that it will not be thermally deformed due to the increase in temperature, resulting in poor guiding performance of the piston 30.

[0064] The usage process of the cylinder in this embodiment will be described in conjunction with the accompanying drawings:

[0065] First, as Figure 1 shown, when it is necessary to adjust the height of the valve needle 40, remove the cylinder head 700, place the suspension part 62 of the press-fitting jig 60 in the limiting groove, and make the main body part 63 abut against the skirt part 31, and fix the press-fitting jig 60 with the locking member 70.

[0066] Secondly, remove the fixing member 90 by using a screwdriver tool, and use a hexagon wrench to screw the adjusting member 50, so that the adjusting member 50 drives the valve needle 40 to rise or fall.

[0067] Finally, fix the fixing member 90 in the valve needle channel again, remove the press-fitting jig 60, and reinstall the cylinder head 700.

[0068] In summary, by using the cylinder and the hot runner system in this embodiment, not only can the height of the valve needle 40 be adjusted quickly, but also the heat dissipation efficiency can be ensured.

[0069] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A cylinder, characterized in that, Comprising: A cylinder block (10) provided with a through hole; A cylinder base (20) disposed at the bottom end of the cylinder block (10), an accommodation cavity (21) being formed in the cylinder base (20), and the through hole communicating with the accommodation cavity (21); A piston (30) disposed in the accommodation cavity (21), the bottom end of the skirt portion (31) of the piston (30) abutting against the inner bottom surface of the cylinder base (20), and a valve needle passage being axially provided inside the piston (30); A valve needle (40) disposed in the valve needle passage; An adjusting member (50) having one end connected to the top end of the valve needle (40) and a screwing portion (51) provided at the other end, and when the screwing portion (51) is rotated, the adjusting member (50) can drive the valve needle (40) to rise or fall in the valve needle passage; A pressing fixture (60) having one end passing through the through hole and abutting against the top end of the skirt portion (31), and the other end hanging to the top end of the cylinder block (10), an adjustment hole (61) communicating with the valve needle passage being axially provided in the pressing fixture (60), and the adjusting member (50) can be rotated through the adjustment hole (61).

2. The cylinder according to claim 1, characterized in that, The pressing fixture (60) includes a hanging portion (62) and a main body portion (63) connected coaxially, the diameter of the hanging portion (62) being larger than the diameter of the main body portion (63), the main body portion (63) extending into the accommodation cavity (21) and abutting against the top end of the skirt portion (31), and a limiting groove being provided at the top end of the cylinder block (10), and the limiting groove can accommodate the hanging portion (62).

3. The cylinder according to claim 2, characterized in that, The distance between the bottom end surface of the hanging portion (62) and the top end surface of the skirt portion (31) is greater than the distance between the bottom end surface of the limiting groove and the top end surface of the skirt portion (31), so that a gap is formed between the bottom end surface of the hanging portion (62) and the bottom end surface of the limiting groove.

4. The cylinder according to claim 2, characterized in that, The hanging portion (62) and the cylinder block (10) are detachably connected by a locking member (70).

5. The cylinder according to claim 2, wherein, An installation groove (11) is further designed in the limiting groove, and the installation groove (11) is used for installing a sealing member (80).

6. The cylinder according to any one of claims 1-5, characterized in that, A fixing member (90) is further provided in the valve needle passage, a sealing member (80) is provided between the fixing member (90) and the side wall of the valve needle passage, the bottom end of the fixing member (90) abuts against the top end of the adjusting member (50), and the fixing member (90) is threadedly connected to the inner side wall of the valve needle passage.

7. The cylinder according to any one of claims 1-5, characterized in that, An indicating mark is designed on the adjusting member (50), a scale value is provided on the piston (30), and the indicating mark can be aligned with one of the scale values.

8. Hot runner system, characterized in that, Comprising a flow dividing plate (100), a support plate (300) and a cylinder as described in any one of claims 1-7, the support plate (300) being detachably connected to the bottom end of the cylinder, and the support plate (300) being detachably connected to the flow dividing plate (100), and the valve needle (40) communicating with a flow dividing channel (110) inside the flow dividing plate (100).

9. The hot runner system according to claim 8, characterized in that, Fixing plates (200) are further spaced apart at the top end of the cylinder, heat dissipation holes (210) are provided on the fixing plates (200), and the heat dissipation holes (210) are opposite to the cylinder.

10. The hot runner system according to claim 9, characterized in that, The aperture diameter of the heat dissipation holes (210) is 1 mm to 3 mm.

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