Driving cylinder and hot runner system

Abstract

The utility model provides a driving cylinder and a hot runner system. The driving cylinder comprises a cylinder body and a piston, a cavity is formed in the cylinder body, the piston is arranged in the cavity and reciprocates in the cavity, and the piston is provided with a fixing hole used for fixing a valve needle; in the moving direction of the piston, the valve needle can be fixed relative to the piston through the fixing hole, so that the piston can drive the valve needle to do reciprocating motion; the fixing hole is a long-strip-shaped hole so that the position of the valve needle fixed to the piston can be adjusted in the direction perpendicular to the movement direction of the piston. According to the driving cylinder, the fixing hole used for fixing and enabling the valve needle to penetrate through is in the long strip shape, the position of the valve needle can be adjusted, and the application range is wide.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot runner systems, in particular to a drive cylinder and a hot runner system provided with the drive cylinder. BACKGROUND

[0002] In the prior art, the drive cylinder (including a pneumatic cylinder and an oil cylinder) for driving the needle valve has a structure capable of driving multiple needle valves simultaneously, each needle valve passing through a fixed hole corresponding in size to the needle valve. However, for different hot runner systems, the position of the needle valve is variable, and the fixed hole limits the position of the needle valve, so that the application scenario of the single-cylinder multi-needle valve structure is relatively single. SUMMARY

[0003] The present application aims to provide a drive cylinder, in which the fixed hole through which the needle valve passes is provided in the form of a long strip, thereby solving the problem of the prior art that the fixed hole limits the position of the needle valve, making the application scenario of the drive cylinder single.

[0004] To achieve one of the above-mentioned purposes, one embodiment of the present application provides a drive cylinder, comprising a cylinder body formed with a cavity and a piston arranged in the cavity and performing reciprocating motion in the cavity, the piston being provided with a fixed hole for fixing a needle valve; in the direction of motion of the piston, the needle valve can pass through the fixed hole relative to the piston, so that the piston can drive the needle valve to perform reciprocating motion; the fixed hole is a long strip-shaped hole, so that the needle valve fixed to the piston can be adjusted in position in the direction perpendicular to the motion direction of the piston.

[0005] As a further improvement of one embodiment of the present application, the piston comprises an outer piston and an inner piston which are relatively fixed, the outer periphery of the outer piston being in close contact with the cavity wall of the cavity, and the fixed hole being provided through the inner piston.

[0006] As a further improvement of one embodiment of the present application, the inner piston is provided with a clearance slot at one end close to the outer piston, and the fixed hole penetrates the bottom of the clearance slot, and in the radial direction of the inner piston, the width of the clearance slot is greater than the width of the fixed hole.

[0007] As a further improvement of one embodiment of the present application, the clearance slot is annular, and the fixed hole is provided with four holes spaced uniformly along the annular clearance slot.

[0008] As a further improvement of one embodiment of the present application, the inner piston is provided with a protruding portion extending outward at one end close to the outer piston, the outer piston is provided with a recess portion corresponding to the protruding portion, the protruding portion is arranged in the recess portion, and a first sealing ring is arranged between the protruding portion and the recess portion.

[0009] As a further improvement of the embodiment of the present application, the outer piston is provided with a first mounting hole, and the inner piston is provided with a second mounting hole, and the outer piston and the inner piston are fixed through the first mounting hole and the second mounting hole.

[0010] As a further improvement of the embodiment of the present application, the cylinder body comprises a base, a cylinder wall and a cylinder cover, and the base, the cylinder wall and the cylinder cover jointly form the cavity; the cylinder wall is provided with a first positioning groove near one end of the cylinder cover and a second positioning groove near one end of the base, the cylinder cover is provided with a first positioning hole corresponding to the first positioning groove, the base is provided with a second positioning hole corresponding to the second positioning groove, and the drive cylinder is further provided with a first rotation-stopping pin penetrating through the first positioning hole and the first positioning groove, and a second rotation-stopping pin penetrating through the second positioning hole and the second positioning groove.

[0011] As a further improvement of the embodiment of the present application, the outer piston is provided with a rotation-stopping groove, and the cylinder cover is provided with a third rotation-stopping pin on the side facing the outer piston, and the third rotation-stopping pin is at least partially inserted into the rotation-stopping groove.

[0012] As a further improvement of the embodiment of the present application, a second sealing ring is arranged between the piston and the cavity wall of the cavity.

[0013] The embodiment of the present application further provides a hot runner system, which comprises a flow distribution plate, a hot nozzle, a valve needle arranged in the hot nozzle, and a drive cylinder for driving the valve needle to perform reciprocating motion, and the drive cylinder is the drive cylinder as described above.

[0014] The one or more technical solutions provided by the present application have at least the following technical effects or advantages:

[0015] In the drive cylinder provided by the present application, the piston is provided with a fixing hole for fixing the valve needle, the fixing hole is in a strip shape, and after the valve needle is installed, the actual position required by the valve needle can be adjusted, so that the position of the valve needle in the drive cylinder of the present application is adjustable, and the application range is wide. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structure schematic diagram of the drive cylinder in the embodiment of the present application from a top view.

[0017] Figure 2 is Figure 1 is a bottom view of the drive cylinder in the embodiment of the present application.

[0018] Figure 3 is Figure 1 is a side view of the drive cylinder in the embodiment of the present application.

[0019] Figure 4 is Figure 3 is a sectional view along the line A-A of the drive cylinder in the embodiment of the present application.

[0020] 11, cavity; 12, cylinder head; 121, first positioning hole; 13, template; 131, first positioning groove; 132, second positioning groove; 14, base; 141, second positioning hole; 151, first rotation-stopping pin; 152, second rotation-stopping pin; 153, third rotation-stopping pin;

[0021] 2, piston; 21, outer piston; 211, first mounting hole; 212, recess; 213, rotation-stopping groove; 22, inner piston; 221, fixing hole; 222, second mounting hole; 223, protrusion; 224, clearance groove; 23, bolt;

[0022] 3, valve needle; 31, head; 32, gasket. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] The terms such as "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like used herein to indicate spatial relative positions are for the purpose of facilitating description to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings. The spatial relative position terms can be intended to include different orientations of the device in use or work other than the orientation shown in the drawings.

[0025] For example, if the device in the drawing is turned over, the unit described as being "below" or "under" the other unit or feature will be "above" the other unit or feature. Therefore, the exemplary term "below" can encompass both the upward and downward orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially-related descriptions used herein are interpreted accordingly.

[0026] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0027] And it should be understood that although the terms first, second, etc. can be used herein to describe various elements or structures, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first mounting hole can be termed a second mounting hole, and, similarly, a second mounting hole can also be termed a first mounting hole, without departing from the scope of the present application.

[0028] The embodiment of the present application provides a driving cylinder which can be used in a hot runner system, therefore, the embodiment of the present application also provides a hot runner system which comprises a distribution plate, a hot nozzle, a valve needle 3 arranged in the hot nozzle and a driving cylinder for driving the valve needle 3 to move back and forth, and the specific structure of the driving cylinder is described below.

[0029] As shown in Figures 1 to 4 , the aforementioned driving cylinder comprises a cylinder body formed with a cavity 11 and a piston 2 arranged in the cavity 11 and moving back and forth in the cavity 11, the piston 2 is provided with a fixing hole 221 for fixing the valve needle 3; in the movement direction of the piston 2, the valve needle 3 can be fixed relative to the piston 2 through the fixing hole 221, so that the piston 2 can drive the valve needle 3 to move back and forth; the fixing hole 221 is a long strip-shaped hole, so that the valve needle 3 fixed to the piston 2 can be adjusted in position in the direction perpendicular to the movement direction of the piston 2.

[0030] The driving cylinder provided by the present application is provided with a long strip-shaped fixing hole 221 on the piston 2, so that after the valve needle 3 is fixed to the piston 2 through the long strip-shaped fixing hole 221, the valve needle 3 can be adjusted along the length direction of the long strip-shaped fixing hole 221 in the direction perpendicular to the movement direction of the piston 2, so that the valve needle 3 is adjusted to a suitable position.

[0031] Further, the piston 2 comprises a relatively fixed outer piston 21 and an inner piston 22, the outer piston 21 is tightly attached to the cavity wall of the cavity 11, and the fixing hole 221 is arranged through the inner piston 22. Therefore, when the outer piston 21 moves back and forth while tightly attached to the cavity wall of the cavity 11, the inner piston 22 is also driven to move back and forth, thereby driving the valve needle 3 fixed to the inner piston 22 to move back and forth.

[0032] Specifically, the outer piston 21 is provided with a first mounting hole 211, the inner piston 22 is provided with a second mounting hole 222, and the outer piston 21 and the inner piston 22 are fixed through the first mounting hole 211 and the second mounting hole 222. Among them, as shown in Figure 4 , the first mounting hole 211 is arranged as a blind hole, so as to ensure the sealing of the driving cylinder. The bolt 23 or other fasteners in Figure 4 may be used to pass through the second mounting hole 222 and the first mounting hole 211 in sequence to fix the outer piston 21 and the inner piston 22.

[0033] In some embodiments, the inner piston 22 extends outwardly near one end of the outer piston 21 to form a protrusion 223, the outer piston 21 is provided with a recess 212 corresponding to the protrusion 223, the protrusion 223 is arranged in the recess 212, and a first sealing ring (not shown in the figure) is arranged between the protrusion 223 and the recess 212. By arranging the recess 212 on the outer piston 21 and the protrusion 223 on the inner piston 22, on the one hand, the inner piston 22 can be roughly positioned during installation, and on the other hand, the inner piston 22 is at least partially overlapped with the outer piston 21 in the radial direction, which can avoid the outer piston 21 and the inner piston 22 being connected to form a gap in the axial direction, thereby reducing the sealing between the outer piston 21 and the inner piston 22. The first sealing ring arranged between the recess 212 and the protrusion 223 further enhances the sealing between the outer piston 21 and the inner piston 22.

[0034] In some embodiments, the inner piston 22 is provided with a clearance slot 224 near one end of the outer piston 21, the fixing hole 221 penetrates the bottom of the clearance slot 224, and the width of the clearance slot 224 is greater than the width of the fixing hole 221 in the radial direction of the inner piston 22. Figure 4 In some embodiments, the valve needle 3 has a head 31 with a large size, the head 31 is arranged in the clearance slot 224, and the main body of the valve needle 3 penetrates the fixing hole 221 to realize the connection between the valve needle 3 and the inner piston 22. Preferably, one end of the head 31 of the valve needle 3 is provided with a gasket 32, the size of the gasket 32 is greater than the size of the fixing hole 221, the valve needle 3 penetrates the gasket 32, and then penetrates the clearance slot 224 and the fixing hole 221 in sequence, so that finally the gasket 32 and the head 31 of the valve needle 3 are arranged in the clearance slot 224, and the head 31 of the valve needle 3 abuts against the bottom of the recess 212 of the outer piston 21, thereby realizing the fixation between the valve needle 3 and the piston 2 in the movement direction of the piston 2.

[0035] Further, the clearance slot 224 is annular, and the fixing hole 221 is uniformly arranged in four along the annular clearance slot 224. Of course, the clearance slot 224 can also correspond to the positions and structures of the fixing holes 221 one by one, and be a plurality of separate slots. The number of the fixing holes 221 is not necessarily four, and can be designed according to the needs.

[0036] In some embodiments, the cylinder body includes a base 14, a cylinder wall, and a cylinder cover 12, the base 14, the cylinder wall, and the cylinder cover 12 jointly form a cavity 11; the cylinder wall is provided with a first positioning slot 131 near one end of the cylinder cover 12 and a second positioning slot 132 near one end of the base 14, the cylinder cover 12 is provided with a first positioning hole 121 corresponding to the first positioning slot 131, the base 14 is provided with a second positioning hole 141 corresponding to the second positioning slot 132, and the drive cylinder is further provided with a first anti-rotation pin 151 penetrating the first positioning hole 121 and the first positioning slot 131, and a second anti-rotation pin 152 penetrating the second positioning hole 141 and the second positioning slot 132.

[0037] The cylinder wall can be formed by a hollow annular structure as a conventional driving cylinder structure, and the base 14 and the cylinder cover 12 serve as the bottom and top of the cavity 11. Figure 4 Alternatively, the template 13 can be used as the cylinder wall, i.e., a through cavity is formed in the template 13, and the base 14 and the cylinder cover 12 are fixed at both ends to form the aforementioned cavity 11.

[0038] The template 13 is used as the cylinder wall in the present application, and the first positioning groove 131 and the second positioning groove 132 are respectively formed at the top and the bottom of the template 13 and are matched with the first positioning hole 121 on the cylinder cover 12 and the second positioning hole 141 on the base 14. The first rotation-stopping pin 151 is inserted into the first positioning hole 121 and the first positioning groove 131 in sequence, and the second rotation-stopping pin 152 is inserted into the second positioning hole 141 and the second positioning groove 132 in sequence. On the one hand, the cylinder cover 12 and the base 14 are respectively positioned and fixed to the template 13. On the other hand, the cylinder cover 12 and the base 14 are prevented from rotating relative to the template 13.

[0039] Further, the outer piston 21 is provided with a rotation-stopping groove 213, and the cylinder cover 12 is provided with a third rotation-stopping pin 153 on the side facing the outer piston 21, which is at least partially inserted into the rotation-stopping groove 213. Since the piston 2 reciprocates in the cavity 11, the length of the third rotation-stopping pin 153 inserted into the rotation-stopping groove 213 changes, but a part of the third rotation-stopping pin 153 is always located in the rotation-stopping groove 213. The cooperation between the third rotation-stopping pin 153 and the rotation-stopping groove 213 not only prevents the piston 2 from rotating and moving the valve needle 3, which causes the valve needle 3 to be twisted off, but also plays a guiding role when the outer piston 21 reciprocates.

[0040] Further, a second sealing ring (not shown in the figure) is arranged between the piston 2 and the cavity wall of the cavity 11, so as to divide the cavity 11 into an upper cavity 11 and a lower cavity 11, thereby promoting the piston 2 to reciprocate by changing the volume of the gas / oil in the upper cavity 11 or the lower cavity 11.

[0041] It should be understood that although the present specification is described in terms of embodiments, each embodiment does not necessarily contain only one independent technical solution, and the specification is described in this way only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0042] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A drive cylinder, characterized in that The cylinder includes a cylinder body with a cavity and a piston arranged in the cavity and reciprocating in the cavity, the piston is provided with a fixing hole for fixing a valve needle, the valve needle can be fixed to the piston through the fixing hole in the movement direction of the piston, so that the piston can drive the valve needle to reciprocate, and the fixing hole is a long strip hole, so that the valve needle fixed to the piston can be adjusted in position in the direction perpendicular to the movement direction of the piston.

2. The drive cylinder according to claim 1, characterized in that The piston includes a relatively fixed outer piston and an inner piston, the outer piston is tightly attached to the cavity wall of the cavity, and the fixing hole is arranged through the inner piston.

3. The drive cylinder according to claim 2, characterized in that The inner piston is provided with a clearance slot at one end close to the outer piston, and the fixing hole penetrates the bottom of the clearance slot, and the width of the clearance slot is greater than the width of the fixing hole in the radial direction of the inner piston.

4. The drive cylinder according to claim 3, characterized in that The clearance slot is annular, and the fixing hole is uniformly arranged with four along the annular clearance slot.

5. The drive cylinder of claim 2, wherein The inner piston is outwardly extended to form a protruding portion at one end close to the outer piston, the outer piston is provided with a recess portion corresponding to the protruding portion, the protruding portion is arranged in the recess portion, and a first sealing ring is arranged between the protruding portion and the recess portion.

6. The drive cylinder of claim 2, wherein The outer piston is provided with a first mounting hole, the inner piston is provided with a second mounting hole, and the outer piston and the inner piston are fixed through the first mounting hole and the second mounting hole.

7. The drive cylinder of claim 2, wherein The cylinder includes a base, a cylinder wall and a cylinder cover, and the base, the cylinder wall and the cylinder cover jointly form the cavity, the cylinder wall is provided with a first positioning slot at one end close to the cylinder cover and a second positioning slot at one end close to the base, the cylinder cover is provided with a first positioning hole corresponding to the first positioning slot, the base is provided with a second positioning hole corresponding to the second positioning slot, and the drive cylinder is further provided with a first rotation stopping pin penetrating the first positioning hole and the first positioning slot and a second rotation stopping pin penetrating the second positioning hole and the second positioning slot.

8. The drive cylinder according to claim 7, characterized in that The outer piston is provided with a rotation stopping slot, the cylinder cover is provided with a third rotation stopping pin on the side facing the outer piston, and the third rotation stopping pin is at least partially inserted into the rotation stopping slot.

9. The drive cylinder according to any one of claims 1 to 8, characterized in that A second sealing ring is arranged between the piston and the cavity wall of the cavity.

10. A hot runner system characterized by, The cylinder includes a cylinder body with a cavity and a piston arranged in the cavity and reciprocating in the cavity, the piston is provided with a fixing hole for fixing a valve needle, the valve needle can be fixed to the piston through the fixing hole in the movement direction of the piston, so that the piston can drive the valve needle to reciprocate, and the fixing hole is a long strip hole, so that the valve needle fixed to the piston can be adjusted in position in the direction perpendicular to the movement direction of the piston.

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