Cold runner cylinder device and needle valve thereof

Abstract

The utility model relates to a cold runner cylinder device and a needle valve thereof. A cold runner air cylinder device comprises a cylinder body provided with a piston hole, a first guide hole communicated with the piston hole, and a first air hole and a second air hole which are communicated with the two ends of the piston hole respectively; the piston comprises a piston ring and a piston rod arranged on the piston ring, the piston ring is movably arranged in the piston hole, a fixing screw hole and a positioning hole which are communicated with each other are formed in the piston rod, and the diameter of the positioning hole is smaller than that of the fixing screw hole; the cylinder cover is arranged on the piston hole and is provided with a second guide hole; the connecting rod is arranged in the fixing screw hole and abuts against the top of the positioning hole, the connecting rod is connected with the valve rod, and the valve rod is movably inserted in the positioning hole; the two ends of the piston rod are movably inserted into the first guide hole and the second guide hole respectively. According to the cold runner air cylinder device, the stepped hole composed of the fixing screw hole and the positioning hole is formed in the piston to achieve positioning of the connecting rod, and therefore the consistency and precision of valve rod installation are improved.

Description

Technical Field

[0001] The utility model relates to a needle valve, in particular to a cold runner cylinder device and a needle valve thereof. Background Art

[0002] An automatic needle valve includes a drive unit and a valve unit, which are connected to the valve unit and are used to drive the valve stem of the valve unit. The drive unit mainly uses a cylinder, and the valve stem and the cylinder piston are connected by threads. For example, the integrated needle valve quick color change structure disclosed in CN218838514U has a connector connected to the interior of the piston by bolts. The needle stem and the connector are fixed to the connector, and the upper cover is threadedly connected to the cylinder body, and the connector is also threadedly connected to the piston. Because the threaded hole on the piston is a through hole, the consistency of the valve stem installation position is poor, and the installation accuracy is not high. Utility Model Content

[0003] In order to solve the above problems of low installation accuracy and poor consistency, the utility model provides a cold runner cylinder device, and the specific technical solution is as follows:

[0004] A cold runner cylinder device comprises: a cylinder body, provided with a piston hole, a first guide hole communicating with the piston hole, a first air hole and a second air hole respectively communicating with the two ends of the piston hole; a piston, the piston comprising a piston ring and a piston rod arranged on the piston ring, the piston ring is movably arranged in the piston hole, the piston rod is provided with a fixing screw hole and a positioning hole communicating with each other, the diameter of the positioning hole is smaller than the diameter of the fixing screw hole; a cylinder cover, provided on the piston hole and provided with a second guide hole; and a connecting rod, provided in the fixing screw hole and resting against the top of the positioning hole, the connecting rod is connected to the valve stem, and the valve stem is movably inserted in the positioning hole; wherein the two ends of the piston rod are respectively movably inserted in the first guide hole and the second guide hole.

[0005] Preferably, a connecting column is provided at the bottom of the connecting rod, a connecting groove is provided on the connecting column, and the connecting groove is connected to the connecting block at the top of the valve stem.

[0006] Furthermore, the connecting groove is a T-shaped groove.

[0007] Preferably, the needle valve driving device further comprises: a locking screw, which is arranged on the fixing screw hole and abuts against the top of the connecting rod.

[0008] Furthermore, the locking screw is provided with an adjustment hole, and the adjustment hole is arranged opposite to the first driving groove at the top of the connecting rod.

[0009] Preferably, the needle valve drive device also includes: a first sealing assembly, which is provided on the piston ring and movably abuts against the piston hole; a second sealing assembly, which is provided on the first guide hole and movably inserted into the piston rod; and a third sealing assembly, which is provided on the second guide hole and movably inserted into the piston rod.

[0010] Furthermore, the first sealing assembly includes a Gly ring.

[0011] A needle valve comprises: a cold runner cylinder device as described above; a valve seat provided at the bottom of the cylinder body and resting on the cylinder cover; and a valve needle sleeve provided on the valve seat and provided with a valve hole, the valve stem movably resting on the valve hole.

[0012] Preferably, a valve sleeve hole is provided on the valve seat; a guide column is provided on the top of the valve needle sleeve, the guide column is inserted into the valve sleeve hole, and the valve needle sleeve is against the bottom of the valve seat.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model provides a cold runner cylinder device which realizes the positioning of the connecting rod by arranging a stepped hole consisting of a fixing screw hole and a positioning hole on the piston, thereby improving the consistency and accuracy of the valve stem installation, making the installation convenient and improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of this application;

[0016] Figure 2 It is a structural diagram of the piston;

[0017] Figure 3 It is a structural diagram of the connecting rod;

[0018] Figure 4 It is a schematic diagram of the structure of the locking screw. DETAILED DESCRIPTION

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] like Figures 1 to 4As shown, a cold runner cylinder device includes a cylinder body 1, a piston 2, a cylinder head 3, and a connecting rod 4. The cylinder body 1 is provided with a piston hole 13, a first guide hole 16, a first air hole 11, and a second air hole 12. The piston hole 13 and the first guide hole 16 are connected and coaxially arranged. The first guide hole 16 is provided at the top of the cylinder body 1, and the piston hole 13 is provided at the bottom of the cylinder body 1. The first air hole 11 and the second air hole 12 are both provided at the top of the cylinder body 1. The first air hole 11 is connected to the top of the piston hole 13, and the second air hole 12 is connected to the bottom of the piston hole 13. The piston 2 includes a coaxially arranged piston ring 22 and a piston rod 21. The piston ring 22 is movably inserted into the piston bore 13. A fixing screw hole 24 and a positioning hole 25 are respectively provided at each end of the piston rod 21. The fixing screw hole 24 and the positioning hole 25 are coaxially arranged, and the diameter of the fixing screw hole 24 is larger than the diameter of the positioning hole 25, forming a stepped hole. The cylinder head 3 is mounted at the bottom of the piston bore 13. A second guide hole 31 is provided in the center of the cylinder head 3. The second guide hole 31 communicates with the piston bore 13 and is coaxially arranged. The ends of the piston rod 21 are movably inserted into the first guide hole 16 and the second guide hole 31, respectively. The first guide hole 16 and the second guide hole 31 guide the piston 2 axially, making the needle valve drive device more compact. The outer circumference of the connecting rod 4 is provided with an external thread, which connects to the fixing screw hole 24. The bottom of the connecting rod 4 abuts the top of the positioning hole 25, and the positioning hole 25 realizes the axial positioning of the connecting rod 4. Connecting rod 4 is connected to the needle valve stem 6, which is also movably inserted into positioning hole 25. Positioning hole 25 allows the valve stem 6 to be raised and lowered axially, so that the valve stem 6 is coaxially arranged with the valve needle sleeve 8. First guide hole 16 and second guide hole 31 are located on either side of piston ring 22, respectively, for reciprocating movement of the piston.

[0021] Since the fixing screw hole 24 and the positioning hole 25 form a stepped hole, the position of the connecting rod 4 can be limited, so that the installation position of the connecting rod 4 is fixed, the consistency and installation accuracy of the connecting rod 4 are improved, and there is no need to repeatedly adjust the position of the connecting rod 4, which improves the assembly efficiency and reduces the assembly cost.

[0022] To facilitate the connection between the connecting post 41 and the valve stem 6, a connecting post 41 is provided at the bottom of the connecting rod 4. The connecting post 41 is provided with a connecting groove 42. The connecting groove 42 connects to the connecting block 61 at the top of the valve stem 6. The connection between the connecting groove 42 and the connecting block 61 not only facilitates assembly, but also effectively prevents the valve stem 6 from rotating when using a threaded connection, thereby improving the reliability and stability of the needle valve drive device. During installation, it is only necessary to insert the connecting block 61 into the connecting groove 42, so that the valve stem 6 is installed at a consistent height and the valve stem 6 is installed more consistently.

[0023] In order to facilitate connection, the connecting groove 42 is a T-shaped groove and the connecting block 61 is a T-shaped block. The T-shaped groove and the T-shaped block can facilitate assembly and reduce processing difficulty.

[0024] In order to prevent the connecting rod 4 from rotating, the needle valve drive device further includes a locking screw 5 . The locking screw 5 is threadedly mounted on the fixing screw hole 24 and abuts against the top of the connecting rod 4 to lock the connecting rod 4 .

[0025] To facilitate maintenance and tightening of the connecting rod 4, the locking screw 5 is provided with an adjustment hole 51. This hole 51 is positioned opposite the first drive slot 43 at the top of the connecting rod 4. The first drive slot 43 is a hexagonal socket. A second drive slot 52 is also provided at the top of the locking screw 5. The diameter of the adjustment hole 51 is larger than the first drive slot 43, facilitating insertion of an hexagonal wrench. The second drive slot 52 is also larger than the diameter of the adjustment hole 51.

[0026] To improve sealing, the needle valve drive device also includes a first sealing assembly 91, a second sealing assembly 92, and a third sealing assembly 93. The first sealing assembly 91 is mounted on the piston ring 22 and flexibly abuts against the piston hole 13. The second sealing assembly 92 is mounted on the first guide hole 16 and flexibly inserts into the piston rod 21. The third sealing assembly 93 is mounted on the second guide hole 31 and flexibly inserts into the piston rod 21. The first sealing assembly 91 is a Glyd ring, which ensures sealing and extends service life. The second and third sealing assemblies 92 and 93 are both sealing rings.

[0027] like Figure 1 As shown, a needle valve includes a needle valve drive device, a valve seat 7, and a valve needle sleeve 8. The valve seat 7 is mounted on the bottom of the cylinder body 1 and abuts against the cylinder head 3. The top of the valve seat 7 is provided with a cavity 71, and the side is provided with a second connecting hole 72 and a connecting groove 73. The connecting groove 73 is an annular groove. The connecting groove 73 communicates with the second connecting hole 72, and the second connecting hole 72 communicates with the cavity 71. The bottom of the cylinder body 1 is provided with a first connecting hole 19, which communicates with the connecting groove 73. The valve needle sleeve 8 is mounted on the valve seat 7 and is located at the bottom of the cavity 71. The valve needle sleeve 8 is also arranged opposite to the valve stem 6. The valve needle sleeve 8 is provided with a valve hole 81. The valve stem 6 movably abuts against the valve hole 81. The valve stem 6 realizes the passage of the valve hole 81, and the valve hole 81 communicates with the cavity 71.

[0028] To facilitate installation, a valve sleeve hole 75 is provided on the valve seat 7; a guide post 82 is provided on the top of the valve needle sleeve 8, which is inserted into the valve sleeve hole 75, and the valve needle sleeve 8 rests on the bottom of the valve seat 7. The valve needle sleeve 8 is pressed tightly against the workpiece through the valve seat 7, making installation convenient.

[0029] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the claims of the present invention.

Claims

1. A cold runner cylinder device, characterized in that: include: The cylinder body (1) is provided with a piston hole (13), a first guide hole (16) communicating with the piston hole (13), and a first air hole (11) and a second air hole (12) respectively communicating with both ends of the piston hole (13); A piston (2), the piston (2) comprising a piston ring (22) and a piston rod (21) disposed on the piston ring (22), the piston ring (22) being movably disposed in the piston hole (13), the piston rod (21) being provided with a fixing screw hole (24) and a positioning hole (25) communicating with each other, the diameter of the positioning hole (25) being smaller than the diameter of the fixing screw hole (24); a cylinder cover (3) disposed on the piston hole (13) and provided with a second guide hole (31); and A connecting rod (4) is disposed in the fixing screw hole (24) and abuts against the top of the positioning hole (25); the connecting rod (4) is connected to the valve stem (6), and the valve stem (6) is movably inserted into the positioning hole (25); Wherein, both ends of the piston rod (21) are movably inserted into the first guide hole (16) and the second guide hole (31) respectively.

2. A cold runner cylinder device according to claim 1, characterized in that: A connecting column (41) is provided at the bottom of the connecting rod (4), a connecting groove (42) is provided on the connecting column (41), and the connecting groove (42) is connected to the connecting block (61) at the top of the valve stem (6).

3. A cold runner cylinder device according to claim 2, characterized in that: The connecting groove (42) is a T-shaped groove.

4. A cold runner cylinder device according to claim 1, characterized in that: The needle valve driving device further comprises: a locking screw (5), wherein the locking screw (5) is arranged on the fixing screw hole (24) and abuts against the top of the connecting rod (4).

5. A cold runner cylinder device according to claim 4, characterized in that: The locking screw (5) is provided with an adjustment hole (51), and the adjustment hole (51) is arranged opposite to the first driving groove (43) at the top of the connecting rod (4).

6. The cold runner cylinder device according to claim 1, characterized in that: The needle valve driving device further includes: A first sealing assembly (91) is provided on the piston ring (22) and movably abuts against the piston hole (13); a second sealing assembly (92), which is disposed on the first guide hole (16) and is movably inserted into the piston rod (21); and The third sealing assembly (93) is provided on the second guide hole (31) and is movably inserted into the piston rod (21).

7. A cold runner cylinder device according to claim 6, characterized in that: The first sealing assembly (91) includes a Gly ring.

8. A needle valve, characterized in that: include: A cold runner cylinder device according to claim 1; a valve seat (7) disposed at the bottom of the cylinder body (1) and resting against the cylinder cover (3); and The valve needle sleeve (8) is arranged on the valve seat (7) and is provided with a valve hole (81), and the valve stem (6) is movably pressed against the valve hole (81).

9. The needle valve according to claim 8, characterized in that: The valve seat (7) is provided with a valve sleeve hole (75); the top of the valve needle sleeve (8) is provided with a guide column (82), the guide column (82) is inserted into the valve sleeve hole (75), and the valve needle sleeve (8) is against the bottom of the valve seat (7).

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