Stroke-adjustable power cylinder

Abstract

The utility model relates to the field of power cylinders, in particular to a stroke-adjustable power cylinder. The power cylinder comprises a cylinder body, a cylinder cover, an inner piston, an outer piston, a valve needle and an adjusting device, the cylinder cover is arranged at an opening in one end of the cylinder body, the outer piston is matched in the cylinder body, the inner piston is in threaded connection with the outer piston, one end of the inner piston is matched with the adjusting device, the other end of the inner piston is connected with the valve needle, and the adjusting device is detachably connected with the outer piston. According to the utility model, the position of the inner piston in the cylinder body is adjusted by rotating the adjusting device, so that the driving stroke of the power cylinder is adjusted, the power cylinder is prevented from being detached and replaced due to different driving strokes, and the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of power cylinders, in particular to an adjustable stroke power cylinder. Background Art

[0002] As an advanced injection molding technology, hot runner technology, its popular use in European and American countries can be traced back to the middle of the last century or even earlier. Due to the many advantages of hot runners, it has developed rapidly abroad. More than 70% of the molds produced by many plastic mold factories use hot runner technology, and some mold factories even reach more than 90%. In China, this technology has only been truly promoted and applied in recent years. With the continuous development of my country's mold industry and the rapid growth of my country's mold exports to European and American companies, the proportion of hot runners used in my country's plastic molds is also increasing.

[0003] More than 80% of hot runner injection molding uses valve needle sealing. When one or more holes are saturated, the valve needle in the mold will extend to seal the outlet. When the next injection is performed, the valve needle in the mold will retract to open the outlet, thereby repeatedly injecting the product. At this time, a drive device is needed. Currently, there are two types of hot runner drives on the market: oil cylinder drive and air cylinder drive. In view of environmental protection and cost issues, plastic mold factories will give priority to pneumatic drive. The traditional pneumatic drive has a fixed stroke. When the injection molded product has a boss or a pit and the drive stroke needs to be adjusted, the template or the manifold needs to be removed. This process also requires a crane to assist in pulling the template and the manifold apart by a sufficient distance, which consumes a lot of manpower and material resources, thereby raising the manufacturing cost, and there are certain safety hazards. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the technical problem described in the background technology, the utility model provides an adjustable stroke power cylinder. The position of the inner piston in the cylinder body is adjusted by rotating the adjusting device, thereby adjusting the driving stroke of the power cylinder, avoiding the need to replace the power cylinder due to different driving strokes, thereby saving production costs.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An adjustable stroke power cylinder comprises a cylinder body, a cylinder cover, an inner piston, an outer piston, a valve needle and an adjusting device. A cylinder cover is provided at an opening at one end of the cylinder body, an outer piston is fitted in the cylinder body, an inner thread of the outer piston is connected to the inner piston, one end of the inner piston is fitted with the adjusting device, and the other end of the inner piston is connected to the valve needle. The adjusting device is connected to the outer piston through a connecting piece.

[0007] Specifically, the connecting piece is a screw, a mounting hole for matching the inner piston is provided at the center of the adjusting device, and a plurality of screw holes for threadedly connecting the connecting piece are distributed on the adjusting device.

[0008] Specifically, a top plate is provided at one end of the inner piston, and a connecting block matching the assembly hole is provided on the top plate, and the top plate cannot pass through the assembly hole.

[0009] Specifically, the outer piston is provided with a circular hole for cooperating with the adjusting device, the circular hole is provided with an annular protrusion for connecting the adjusting device, the annular protrusion is provided with several holes for inserting the connecting piece, and the inner wall of the center hole of the annular protrusion is provided with a thread for threaded connection with the inner piston.

[0010] Specifically, bolts are connected to the cylinder head.

[0011] Specifically, a retaining spring for preventing the inner piston from being separated from the adjusting device is inserted into the connecting block.

[0012] Specifically, the hole is a smooth hole or a threaded hole.

[0013] The beneficial effect of the utility model is that the utility model provides an adjustable stroke power cylinder. The position of the inner piston in the cylinder body is adjusted by rotating the adjustment device, thereby adjusting the driving stroke of the power cylinder, avoiding the need to replace the power cylinder due to different driving strokes, thereby saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the regulating device of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the inner piston of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the outer piston of the utility model;

[0019] Figure 5 It is a structural schematic diagram of the inner piston and the retaining spring of the utility model;

[0020] In the figure, 1. cylinder body, 2. cylinder head, 3. inner piston, 4. outer piston, 5. valve needle, 6. adjusting device, 7. bolt, 8. retaining ring, 31. top plate, 32. connecting block, 41. annular protrusion, 42. hole, 61. assembly hole, 62. screw hole 1, 63. connecting piece. DETAILED DESCRIPTION

[0021] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0022] Figure 1 It is a cross-sectional view of the utility model; Figure 2 It is a structural schematic diagram of the regulating device of the utility model; Figure 3 It is a structural schematic diagram of the inner piston of the utility model; Figure 4 It is a structural schematic diagram of the outer piston of the utility model; Figure 5 It is a structural schematic diagram of the inner piston and the retaining spring of the utility model.

[0023] As attached Figure 1 As shown, an adjustable stroke power cylinder includes a cylinder body 1, a cylinder head 2, an inner piston 3, an outer piston 4, a valve needle 5, and an adjusting device 6. The cylinder head 2 is provided at an opening at one end of the cylinder body 1, the outer piston 4 is matched in the cylinder body 1, the inner piston 4 is connected to the inner piston 3 through the inner thread of the outer piston 4, one end of the inner piston 3 is matched with the adjusting device 6, the other end of the inner piston 3 is connected to the valve needle 5, and the adjusting device 6 is connected to the outer piston 4 through a connecting piece 63.

[0024] As attached Figure 2 As shown, the connecting member 63 is a screw, and a mounting hole 61 for matching the inner piston 3 is provided at the center of the adjusting device 6. A plurality of screw holes 62 for threadedly connecting the connecting member 63 are distributed on the adjusting device 6.

[0025] As attached Figure 3 As shown, a top plate 31 is provided at one end of the inner piston 3 , and a connecting block 32 matching with the assembly hole 61 is provided on the top plate 31 , and the top plate 31 cannot pass through the assembly hole 61 .

[0026] As attached Figure 4 As shown, a circular hole for cooperating with the adjusting device 6 is provided in the outer piston 4, an annular protrusion 41 for connecting the adjusting device 6 is provided in the circular hole, a plurality of holes 42 for inserting the connecting piece 63 are provided on the annular protrusion 41, and a thread for threaded connection to the inner piston 3 is provided on the inner wall of the center hole of the annular protrusion 41.

[0027] The cylinder head 2 is connected with bolts 7 .

[0028] As attached Figure 5 As shown, a clamping spring 8 for preventing the inner piston 3 from being separated from the adjusting device 6 is inserted on the connecting block 32 .

[0029] The hole 42 is a plain hole or a threaded hole.

[0030] Embodiment 1: The assembly hole 61 of the adjusting device 6 cooperates with the connecting block 32 of the inner piston 3, so that when the adjusting device 6 rotates, the inner piston 3 can be driven to rotate synchronously. When the position of the valve needle 5 in the power cylinder is to be adjusted, the bolt 7 is first unscrewed and the cylinder cover 2 is removed. Then the adjusting device 6 is rotated, and the adjusting device 6 drives the inner piston 3 to rotate, and the inner piston 3 will move along the central threaded hole of the outer piston 4, so that the position of the inner piston 3 and the valve needle 5 in the power cylinder is moved. After the position of the inner piston 3 and the valve needle 5 is adjusted, the connecting piece 63 (screw) is screwed into the screw hole 1 62 and the hole 42 (the hole 42 is a threaded hole), so as to connect the outer piston 4 and the adjusting device 6 together. When the gas source or liquid source is input into the cylinder body 1, it will push the outer piston 4, the inner piston 3 and the valve needle 5 to move along the cylinder body 1.

[0031] Embodiment 2: The assembly hole 61 of the adjusting device 6 cooperates with the connecting block 32 of the inner piston 3, so that when the adjusting device 6 rotates, the inner piston 3 can be driven to rotate synchronously. When the position of the valve needle 5 in the power cylinder is to be adjusted, the bolt 7 is first unscrewed and the cylinder cover 2 is removed. Then the adjusting device 6 is rotated, and the adjusting device 6 drives the inner piston 3 to rotate, and the inner piston 3 will move along the central threaded hole of the outer piston 4, so that the position of the inner piston 3 and the valve needle 5 in the power cylinder is moved. After the position of the inner piston 3 and the valve needle 5 is adjusted, the connecting piece 63 (screw) is screwed into the screw hole 1 62 until the end of the connecting piece 63 is inserted into the hole 42 (the hole 42 is a light hole), and the retaining ring 8 is inserted into the connecting block 32, so that the outer piston 4 and the adjusting device 6 are connected together. When the gas source or liquid source is input into the cylinder body 1, the outer piston 4, the inner piston 3 and the valve needle 5 will be pushed to move along the cylinder body 1.

[0032] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An adjustable stroke power cylinder, characterized in that: The invention comprises a cylinder body (1), a cylinder cover (2), an inner piston (3), an outer piston (4), a valve needle (5), and an adjusting device (6); the cylinder body (1) is provided with a cylinder cover (2) at an opening at one end; the cylinder body (1) is fitted with an outer piston (4); the outer piston (4) is connected to the inner piston (3) through an inner thread; one end of the inner piston (3) is fitted with the adjusting device (6); the other end of the inner piston (3) is connected to the valve needle (5); and the adjusting device (6) is connected to the outer piston (4) through a connecting piece (63).

2. The adjustable stroke power cylinder according to claim 1, characterized in that: The connecting piece (63) is a screw. The center of the adjusting device (6) is provided with an assembly hole (61) for matching the inner piston (3). The adjusting device (6) is provided with a plurality of screw holes (62) for threadedly connecting the connecting piece (63).

3. The adjustable stroke power cylinder according to claim 2, characterized in that: A top plate (31) is provided at one end of the inner piston (3), and a connecting block (32) matching with the assembly hole (61) is provided on the top plate (31), and the top plate (31) cannot pass through the assembly hole (61).

4. The adjustable stroke power cylinder according to claim 2, characterized in that: The outer piston (4) is provided with a circular hole for matching the adjusting device (6), the circular hole is provided with an annular protrusion (41) for connecting the adjusting device (6), the annular protrusion (41) is provided with a plurality of holes (42) for inserting the connecting piece (63), and the inner wall of the center hole of the annular protrusion (41) is provided with a thread for threaded connection with the inner piston (3).

5. The adjustable stroke power cylinder according to claim 1, characterized in that: Bolts (7) are connected to the cylinder cover (2).

6. The adjustable stroke power cylinder according to claim 3, characterized in that: A retaining spring (8) is connected to the connecting block (32) and is used to prevent the inner piston (3) from being separated from the adjusting device (6).

7. The adjustable stroke power cylinder according to claim 4, characterized in that: The hole (42) is a smooth hole or a threaded hole.

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