Hot runner system and control unit

Abstract

The present invention discloses a hot runner system and a control unit. The hot runner system includes a hot nozzle and a valve needle. The valve needle can be driven to slide. The hot runner system also includes a control unit. The control unit includes a drive cylinder, a base fixed relative to the drive cylinder, a first rotating beam and a second rotating beam both rotatably connected to the base. The drive cylinder has a cylinder body and a drive rod that can reciprocate along a straight line. The movement direction of the drive rod is parallel to the sliding direction of the valve needle. A pull rod is connected to the drive rod. The pull rod is connected to the first rotating beam through a connecting shaft. A valve needle cap is fixed on the valve needle. The valve needle cap is connected to the second rotating beam through the valve needle shaft, and the first rotating beam is connected to the second rotating beam. When the first rotating beam is driven by the drive rod to rotate relative to the base, the first rotating beam drives the second rotating beam to rotate, so as to drive the valve needle to move. The present invention ensures that the heat of the hot nozzle will not affect the drive cylinder, while exerting a greater driving force on the valve needle.

Description

Technical Field

[0001] The invention relates to the field of hot runner molds, and in particular to a hot runner system and a control unit. Background Art

[0002] At present, the injection mold commonly used in the injection molding industry is the hot runner injection mold. Compared with ordinary molds, the plastic products injected by the hot runner system are of higher quality, and the hot runner system has the advantages of saving raw materials, improving production efficiency, and a high degree of automation.

[0003] The hot runner system usually includes a hot nozzle with a flow channel and a valve needle in the flow channel. The valve needle is driven by a drive cylinder so that the valve needle can slide back and forth to close or open the flow channel. In order to smoothly inject the plastic material into the cavity, the material must be in a liquid state, and the hot nozzle must be kept at a certain high temperature to keep the material in a liquid state. The drive cylinder is located above the hot nozzle, and the high temperature of the hot nozzle will increase the temperature around the drive cylinder. In order to cool the drive cylinder, a water circulation system is usually set around the drive cylinder to achieve the purpose of cooling. However, such a setting makes the structure of the entire system very complicated and the cost is relatively high.

[0004] To solve the above problems, technicians conducted research and offset the drive cylinder relative to the hot nozzle. In the longitudinal direction, the drive cylinder was deviated from the hot nozzle. Although this solved the problem that the heat from the hot nozzle could easily affect the drive cylinder, the structure was not stable and reliable enough, and the driving force on the valve needle was relatively small. Summary of the invention

[0005] The object of the present invention is to provide a hot runner system and a control unit, so that the heat of the hot nozzle will not affect the driving cylinder and the driving force on the valve needle is relatively large.

[0006] To achieve one of the above-mentioned objects, an embodiment of the present invention provides a hot runner system, the hot runner system comprising a hot nozzle provided with a flow channel, and a valve needle provided in the flow channel, the valve needle can be driven to slide to close or open the flow channel, wherein:

[0007] The hot runner system also includes a control unit, which includes a driving cylinder, a base fixed relative to the driving cylinder, a first rotating beam rotatably connected to the base via a first rotating shaft, and a second rotating beam rotatably connected to the base via a second rotating shaft. The driving cylinder has a cylinder body and a driving rod that can reciprocate in a straight line relative to the cylinder body, and the movement direction of the driving rod is parallel to the sliding direction of the valve needle. A pull rod is fixedly connected to the driving rod, and the pull rod is connected to the first rotating beam via a connecting shaft. A valve needle cap is fixedly provided on the valve needle, and the valve needle cap is connected to the second rotating beam via a valve needle shaft, and the first rotating beam is connected to the second rotating beam. When the first rotating beam is driven by the driving rod to rotate relative to the base, the first rotating beam drives the second rotating beam to rotate, so as to drive the valve needle to move.

[0008] As a further improvement of an embodiment of the present invention, a transmission block is provided between the first rotating beam and the second rotating beam, so that the first rotating beam drives the second rotating beam to rotate.

[0009] As a further improvement of one embodiment of the present invention, the transmission block is movably mounted on the base, and the base is provided with a longitudinal groove extending in the longitudinal direction and a vertical long hole intersecting the longitudinal groove and extending in the vertical direction, the extension direction of the longitudinal groove is perpendicular to the extension direction of the vertical long hole, the transmission block is located in the longitudinal groove, and the first rotating beam and the second rotating beam are both located on the outside of the base.

[0010] As a further improvement of an embodiment of the present invention, the transmission block is connected to the first rotating beam via a first installation shaft, and the transmission block is connected to the second rotating beam via a second installation shaft.

[0011] As a further improvement of an embodiment of the present invention, the center line of the first installation axis and the center line of the second installation axis define a first plane, and the first rotating axis and the second rotating axis are located on both sides of the first plane.

[0012] As a further improvement of an embodiment of the present invention, the center line of the first rotating shaft and the center line of the second rotating shaft define a second plane, and the second plane intersects with the transmission block.

[0013] As a further improvement of an embodiment of the present invention, the hot runner system further includes a clamping mechanism, which presses the base against the cylinder body.

[0014] As a further improvement of one embodiment of the present invention, the clamping mechanism includes a pressing plate and two pressing blocks. The base is provided with a through hole passing through both side surfaces. The pressing block extends through the through hole and abuts against the cylinder body. The pressing plate is clamped on top of the two pressing blocks.

[0015] As a further improvement of an embodiment of the present invention, the control unit further includes a blocking member fixedly arranged relative to the base.

[0016] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention further provides a control unit for a hot runner system, the control unit is used to control the sliding of a valve needle, wherein the control unit includes a driving cylinder, a base fixed relative to the driving cylinder, a first rotating beam rotatably connected to the base via a first rotating shaft, and a second rotating beam rotatably connected to the base via a second rotating shaft, the driving cylinder has a cylinder body and a driving rod that can reciprocate in a straight line relative to the cylinder body, the movement direction of the driving rod is parallel to the sliding direction of the valve needle, a pull rod is fixedly connected to the driving rod, and the pull rod is connected to the first rotating beam via a connecting shaft, a valve needle cap is fixedly provided on the valve needle, the valve needle cap is connected to the second rotating beam via the valve needle shaft, and the first rotating beam is connected to the second rotating beam, when the first rotating beam is driven by the driving rod to rotate relative to the base, the first rotating beam drives the second rotating beam to rotate, so as to drive the valve needle to move.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the driving rod transmits the motion to the second rotating beam through the first rotating beam, and the second rotating beam transmits the motion to the valve needle cap to drive the valve needle to slide back and forth, so the driving cylinder deviates from the hot nozzle, so that the heat of the hot nozzle does not affect the driving cylinder. In addition, the power of the driving cylinder is transmitted to the valve needle through the first rotating beam and the second rotating beam, and the driving force on the valve needle is greater when the power of the driving cylinder is constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional exploded schematic diagram of a hot runner system in a specific embodiment of the present invention;

[0019] Figure 2 yes Figure 1 3D view of the hot runner system

[0020] Figure 3 yes Figure 1 The front view of the hot runner system;

[0021] Figure 4 yes Figure 1 Top view of the hot runner system;

[0022] Figure 5 yes Figure 4 Cross-sectional view of the hot runner system. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0024] In various drawings of the present application, for the convenience of illustration, some sizes of structures or parts are exaggerated relative to other structures or parts, and thus, are only used to illustrate the basic structure of the subject matter of the present application.

[0025] As used herein, terms indicating spatial relative positions such as "upper," "above," "lower," and "below" are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms of spatial relative position may be intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the figure is turned over, units described as being "below" or "beneath" other units or features will be located "above" the other units or features. Thus, the exemplary term "below" can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0026] like Figures 1 to 5 As shown, a specific embodiment of the present invention provides a hot runner system, which includes a hot nozzle (not shown) provided with a flow channel and a valve needle (not shown) provided in the flow channel. The valve needle can be driven to slide to close or open the flow channel.

[0027] The hot runner system also includes a control unit, which includes a drive cylinder 10, a base 12 fixed relative to the drive cylinder 10, a first rotating beam 16 rotatably connected to the base 12 through a first rotating shaft 14, and a second rotating beam 17 rotatably connected to the base 12 through a second rotating shaft 15. The drive cylinder 10 has a cylinder body 18 and a drive rod 20 that can reciprocate in a straight line relative to the cylinder body 18. The movement direction of the drive rod 20 is parallel to the sliding direction of the valve needle. A pull rod 22 is fixedly connected to the drive rod 20, and the pull rod 22 is connected to the first rotating beam 16 through a connecting shaft 24. A valve needle cap 26 is fixedly provided on the valve needle, and the valve needle cap 26 is connected to the second rotating beam 17 through a valve needle shaft 28, and the first rotating beam 16 is connected to the second rotating beam 17. When the first rotating beam 16 is driven by the drive rod 20 to rotate relative to the base 12, the first rotating beam 16 drives the second rotating beam 17 to rotate, so as to drive the valve needle to move.

[0028] In this preferred embodiment, the driving rod 20 transmits the motion to the second rotating beam 17 through the first rotating beam 16, and the second rotating beam 17 transmits the motion to the valve needle cap 26 to drive the valve needle to slide back and forth, so that the driving cylinder 10 deviates from the hot nozzle, so that the heat of the hot nozzle does not affect the driving cylinder 10. In addition, the power of the driving cylinder 10 is transmitted to the valve needle through the first rotating beam 16 and the second rotating beam 17. When the power of the driving cylinder 10 is constant, the driving force on the valve needle is greater.

[0029] Preferably, the drive cylinder 10 is a pneumatic cylinder. Usually, the power of a pneumatic cylinder is relatively small, and the first rotating beam 16 and the second rotating beam 17 of this embodiment are used to transmit the power of the pneumatic cylinder to the valve needle, which can amplify the driving force of the pneumatic cylinder. Of course, the drive cylinder 10 can also be set as an oil cylinder.

[0030] The first rotating beam 16 and the second rotating beam 17 are both provided in two pieces, and the two first rotating beams 16 and the two second rotating beams 17 are symmetrically arranged on both sides of the base 12. The connecting shaft 24 extends through the two first rotating beams 16, and the valve needle shaft 28 extends through the two second rotating beams 17. The base 12 is provided with a first long hole 32 and a second long hole 34, and the first long hole 32 and the second long hole 34 both extend longitudinally along the moving direction of the driving rod 20, the connecting shaft 24 passes through the first long hole 32, and the valve needle shaft 28 passes through the second long hole 34.

[0031] Furthermore, a transmission block 35 is provided between the first rotating beam 16 and the second rotating beam 17 so that the first rotating beam 16 drives the second rotating beam 17 to rotate. The first rotating beam 16 is located inside the second rotating beam 17, and notches 19 are provided on both sides of the base 12, and the first rotating beam 16 is at least partially located in the notches 19.

[0032] Specifically, the transmission block 35 is movably mounted on the base 12, and the base 12 is provided with a longitudinal groove 36 extending in the longitudinal direction and a vertical long hole 38 intersecting the longitudinal groove 36 and extending in the vertical direction. The extension direction of the longitudinal groove 36 is perpendicular to the extension direction of the vertical long hole 38, and the transmission block 35 is located in the longitudinal groove 36, and the first rotating beam 16 and the second rotating beam 17 are both located on the outside of the base 12.

[0033] The transmission block 35 is connected to the first rotating beam 16 through the first installation shaft 40, and the transmission block 35 is connected to the second rotating beam 17 through the second installation shaft 42. The distance from the second installation shaft 42 to the second rotating shaft 15 is greater than the distance from the second rotating shaft 15 to the valve needle shaft 28, so that the force arm between the second rotating shaft 15 and the valve needle shaft 28 is shorter, which can amplify the transmission force. The distance from the first installation shaft 40 to the first rotating shaft 14 is less than the distance from the first rotating shaft 14 to the connecting shaft 24, thereby further amplifying the transmitted force.

[0034] The center line of the first installation axis 40 and the center line of the second installation axis 42 define a first plane P1 , and the first rotating axis 14 and the second rotating axis 15 are located on both sides of the first plane P1 .

[0035] The center line of the first rotating shaft 14 and the center line of the second rotating shaft 15 define a second plane P2, and the second plane P2 intersects with the transmission block 35, thereby making the overall structure more compact.

[0036] The hot runner system further includes a clamping mechanism, which clamps the base 12 to the cylinder body 18, thereby preventing the base 12 from loosening relative to the cylinder body 18, making the overall structure more stable and reliable.

[0037] Furthermore, the pressing mechanism includes a pressing sheet 44 and two pressing blocks 46. The base 12 is provided with a through hole penetrating through the two side surfaces. The pressing blocks 46 extend through the through hole and abut against the cylinder body 18. The pressing sheet 44 is pressed against the top of the two pressing blocks 46. The pressing sheet 44 presses the two pressing blocks 46 into one body to prevent loosening. Furthermore, the pressing sheet 44 is provided in two pieces, and the two pressing sheets 44 are located on both sides of the base 12. The two pressing blocks 46 extend and protrude from both sides of the base 12, so that the two pressing sheets 44 are respectively pressed against the two ends of the two pressing blocks 46.

[0038] The control unit further includes a blocking member 50 fixedly arranged relative to the base 12. The blocking member 50 is used to block the heat of the hot nozzle from being transferred to the drive cylinder 10. Specifically, the blocking member 50 includes a fixing portion 52 located between the base 12 and the cylinder body 18 and a blocking portion 54 extending from the fixing portion 52 to a portion of the outer periphery of the cylinder body 18.

[0039] The control unit further includes a reinforcement component connected to the second rotating beam 17 , and the reinforcement component extends through the base 12 . When the second rotating beam 17 rotates relative to the base 12 , the reinforcement component moves relative to the base 12 .

[0040] Due to the provision of the reinforcement assembly, when the first rotating beam 16 drives the second rotating beam 17 to rotate, the reinforcement assembly is fixed relative to the second rotating beam 17 and moves relative to the base 12, so that the rotation of the second rotating beam 16 is more stable and reliable.

[0041] Specifically, two reinforcement components are provided. The reinforcement components include a fastener 56 passing through the second rotating beam 17, a sleeve 58 sleeved on the outer circumference of the fastener 56, and a locking nut 60 threadedly connected to the fastener 56. The base 12 is provided with a through hole 62 having an outer diameter larger than the sleeve 58, and the sleeve 58 passes through the through hole 62. Taking the installation of one of the reinforcement components as an example, the fastener 56 passes through one of the second rotating beams 17 from one side, and sleeves the sleeve 58, then passes through the through hole 62 on the base 12, and finally passes through the other second rotating beam 17, and is matched with the locking nut 60, so as to connect the second rotating beams 17 on both sides to the base 12.

[0042] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0043] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hot runner system, comprising a hot nozzle provided with a flow channel, and a valve needle provided in the flow channel, wherein the valve needle can be driven to slide to close or open the flow channel, characterized in that: The hot runner system also includes a control unit, which includes a driving cylinder, a base fixed relative to the driving cylinder, a first rotating beam rotatably connected to the base via a first rotating shaft, and a second rotating beam rotatably connected to the base via a second rotating shaft, the driving cylinder having a cylinder body and a driving rod that can reciprocate in a straight line relative to the cylinder body, the movement direction of the driving rod is parallel to the sliding direction of the valve needle, a pull rod is fixedly connected to the driving rod, the pull rod is connected to the first rotating beam via a connecting shaft, a valve needle cap is fixedly provided on the valve needle, the valve needle cap is connected to the second rotating beam via a valve needle shaft, and the first rotating beam is connected to the second rotating beam, when the first rotating beam is driven by the driving rod to rotate relative to the base, the first rotating beam drives the second rotating beam to rotate, so as to drive the valve needle to move; A transmission block is provided between the first rotating beam and the second rotating beam, so that the first rotating beam drives the second rotating beam to rotate; The transmission block is connected to the first rotating beam via a first mounting shaft, and the transmission block is connected to the second rotating beam via a second mounting shaft; Wherein, the distance from the second installation axis to the second rotating axis is greater than the distance from the second rotating axis to the valve needle axis; the distance from the first installation axis to the first rotating axis is less than the distance from the first rotating axis to the connecting axis.

2. The hot runner system according to claim 1, characterized in that: The transmission block is movably mounted on the base, and the base is provided with a longitudinal groove extending in the longitudinal direction and a vertical long hole intersecting the longitudinal groove and extending in the vertical direction, the extension direction of the longitudinal groove is perpendicular to the extension direction of the vertical long hole, the transmission block is located in the longitudinal groove, and the first rotating beam and the second rotating beam are both located on the outside of the base.

3. The hot runner system according to claim 1, characterized in that: The center line of the first installation axis and the center line of the second installation axis define a first plane, and the first rotating axis and the second rotating axis are located on both sides of the first plane.

4. The hot runner system according to claim 1, characterized in that: The center line of the first rotating shaft and the center line of the second rotating shaft define a second plane, and the second plane intersects the transmission block.

5. The hot runner system according to claim 1, characterized in that: The hot runner system further comprises a clamping mechanism, which presses the base against the cylinder body.

6. The hot runner system according to claim 5, characterized in that: The pressing mechanism comprises a pressing sheet and two pressing blocks. The base is provided with a through hole penetrating through two side surfaces. The pressing blocks extend through the through holes and abut against the cylinder body. The pressing sheet is pressed on top of the two pressing blocks.

7. The hot runner system according to claim 1, characterized in that: The control unit further comprises a blocking member which is fixedly arranged relative to the base.

8. A control unit for a hot runner system, the control unit being used to control the sliding movement of a valve needle, characterized in that: The control unit includes a driving cylinder, a base fixed relative to the driving cylinder, a first rotating beam rotatably connected to the base through a first rotating shaft, and a second rotating beam rotatably connected to the base through a second rotating shaft, the driving cylinder has a cylinder body and a driving rod that can reciprocate in a straight line relative to the cylinder body, the movement direction of the driving rod is parallel to the sliding direction of the valve needle, a pull rod is fixedly connected to the driving rod, the pull rod is connected to the first rotating beam through a connecting shaft, a valve needle cap is fixedly provided on the valve needle, the valve needle cap is connected to the second rotating beam through the valve needle shaft, and the first rotating beam is connected to the second rotating beam, when the first rotating beam is driven by the driving rod to rotate relative to the base, the first rotating beam drives the second rotating beam to rotate, so as to drive the valve needle to move; A transmission block is provided between the first rotating beam and the second rotating beam, so that the first rotating beam drives the second rotating beam to rotate; The transmission block is connected to the first rotating beam via a first mounting shaft, and the transmission block is connected to the second rotating beam via a second mounting shaft; Wherein, the distance from the second installation axis to the second rotating axis is greater than the distance from the second rotating axis to the valve needle axis; the distance from the first installation axis to the first rotating axis is less than the distance from the first rotating axis to the connecting axis.

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