A bottom mold cylinder device

Abstract

The present invention discloses a bottom mold cylinder device, comprising a cylinder body, a piston, and a support seat. The interior of the cylinder is divided into two chambers by the piston, with the end with the support seat being the first chamber and the end without the support seat being the second chamber. A first vent pipe joint is provided at the bottom of the cylinder to communicate with the second chamber, forming a first air path; a second vent pipe joint is provided on the side wall of the cylinder, and an air path channel is also provided in the side wall of the cylinder, with one end of the air path channel communicating with the first chamber and the other end communicating with the second vent pipe joint to form a second air path; a constant air pressure is continuously introduced into the second air path, which forms a downward constant pressure together with the weight of the piston and the main blowing pressure introduced when blowing the bottle; an upward pressure greater than the constant pressure is introduced into the first air path, and the cylinder is pushed upward; when the upward pressure is stopped from being introduced into the first air path, the cylinder descends. The device has a simple structure, and the air pressure is continuously introduced into the second air path, so that the piston generates a downward buffering force, thereby avoiding damage to components due to excessive impact force and making the operation of the equipment more stable.

Description

Technical Field

[0001] The invention relates to a hot filling bottle device, in particular to a hot filling bottle bottom mold cylinder device. Background Art

[0002] The preform is placed in a mold and blown into a container. To enhance aesthetics and give the finished bottle a three-dimensional feel, various designs are often engraved on the mold. During hot filling, the softening plastic of the bottle can easily shrink and deform as it cools. To address this, a retractable, heated bottom mold is typically placed at the bottom of the mold. During the blowing process, the bottom of the bottle is first blown into a convex shape. Then, an air cylinder pushes the bottom mold upward, transforming the downward-protruding bottom into an upward-concave shape, completing the shrinkage and extrusion process.

[0003] Existing hot-fill bottling equipment primarily consists of a cylinder, a base mold, and a piston. The cylinder utilizes alternating air intake and exhaust to propel the piston back and forth, achieving the raising and lowering of the base mold. The sudden introduction of compressed air during the raising and lowering process creates a significant force, and there's no cushioning during the raising or lowering process. Due to the high impact cycles associated with hot-fill bottling, components can quickly deteriorate from the intense vibrations, necessitating frequent downtime for repairs, significantly impacting production and increasing costs. Summary of the Invention

[0004] The invention provides a bottom mold cylinder device with simple structure and stable operation.

[0005] A bottom mold cylinder device includes a cylinder body, a piston inside the cylinder body that can slide relative to the cylinder body, and a support seat that passes through the top of the cylinder and is connected to the piston. The interior of the cylinder is divided into two chambers by the piston, the end with the support seat is the first chamber, and the end without the support seat is the second chamber. A first ventilation pipe joint is provided at the bottom of the cylinder to connect with the second chamber to form a first air path; a second ventilation pipe joint is provided on the side wall of the cylinder, and an air path channel is also provided in the side wall of the cylinder, one end of the air path channel is connected to the first chamber, and the other end is connected to the second ventilation pipe joint to form a second air path; a constant air pressure is continuously introduced into the second air path, which forms a downward constant pressure together with the weight of the piston and the main blowing pressure introduced when blowing bottles. When an upper pressure greater than the constant pressure is introduced into the first air path, the cylinder is pushed up; when the first air path stops introducing the upper pressure, the cylinder descends.

[0006] The bottom mold cylinder device is provided with a first vent pipe joint connected to the second chamber at the bottom of the cylinder to form a first air path; one end of the air path channel provided on the side wall of the cylinder is connected to the first chamber, and the corresponding second vent pipe joint is connected to the other end of the air path to form a second air path; when the bottle blowing control piston is pushed up, a constant air pressure is continuously introduced into the second air path to generate a downward buffering pressure on the piston, and the piston is moved upward by controlling the air pressure introduced into the first air path, thereby ensuring sufficient impact force to keep the shape of the bottle bottom intact while also avoiding damage to the components of the device caused by excessive impact force; The second air circuit continuously introduces air pressure. When the air supply from the first air circuit is stopped, the upward pressure on the piston gradually decreases during the exhaust process of the first air circuit. At this time, the piston slowly moves downward under the action of the constant air pressure of the second air circuit. After the exhaust of the first air circuit is completed, the piston can be slowly controlled to move downward, which not only saves the time interval between alternating ventilation and exhaust, but also avoids damage to components due to excessive impact force. The device has a simple structure and continuously introduces air pressure through the second air circuit, so that the piston generates a downward buffering force, which avoids damage to components due to excessive impact force, makes the equipment run more stably, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a structural diagram of the lowest position state of a bottom mold cylinder device.

[0008] Figure 2 This is a structural diagram of the middle position state of a bottom mold cylinder device.

[0009] Figure 3 This is a structural diagram of the highest position state of a bottom mold cylinder device. DETAILED DESCRIPTION

[0010] like Figure 1 、 23, a bottom mold cylinder device, comprising a cylinder body (1), a piston (2) inside the cylinder body (1) that can slide relative to the cylinder body, a support seat (3) passing through the top of the cylinder and connected to the piston, the interior of the cylinder is divided into two chambers by the piston, the end with the support seat is the first chamber (4), and the end without the support seat is the second chamber (5), a first ventilation pipe joint (6) is provided at the bottom of the cylinder to communicate with the second chamber (5), forming a first air path; a second ventilation pipe joint (7) is provided on the side wall of the cylinder ), an air passage (8) is further provided in the side wall of the cylinder, one end of the air passage (8) is connected to the first chamber (4), and the other end is connected to the second ventilation pipe joint (7), forming a second air passage; the second air passage continuously introduces a constant air pressure (P1), which forms a downward constant pressure together with the weight of the piston and the main blowing air pressure (P2) introduced when blowing the bottle; the first air passage introduces an upward pressure (P3) greater than the constant pressure, and the cylinder is pushed upward; the first air passage stops introducing the upward pressure (P3), and the cylinder descends. The bottom mold cylinder device is provided with a first vent pipe joint connected to the second chamber at the bottom of the cylinder to form a first air path; one end of the air path channel provided on the side wall of the cylinder is connected to the first chamber, and the corresponding second vent pipe joint is connected to the other end of the air path to form a second air path; when the bottle blowing control piston is pushed up, a constant air pressure is continuously introduced into the second air path to generate a downward buffering pressure on the piston, and the piston is moved upward by controlling the air pressure introduced into the first air path, thereby ensuring sufficient impact force to keep the shape of the bottle bottom intact while also avoiding damage to the components of the device caused by excessive impact force; The second air circuit continuously introduces air pressure. When the air supply from the first air circuit is stopped, the upward pressure on the piston gradually decreases during the exhaust process of the first air circuit. At this time, the piston slowly moves downward under the action of the constant air pressure of the second air circuit. After the exhaust of the first air circuit is completed, the piston can be slowly controlled to move downward, which not only saves the time interval between alternating ventilation and exhaust, but also avoids damage to components due to excessive impact force. The device has a simple structure and continuously introduces air pressure through the second air circuit, so that the piston generates a downward buffering force, which avoids damage to components due to excessive impact force, makes the equipment run more stably, and improves work efficiency.

[0011] In the bottom mold cylinder device, the constant air pressure (P1), the main blowing air pressure (P2), and the upper pushing air pressure (P3) are controlled by proportional regulating valves. The upper pushing air pressure (P3) can be calculated based on the bottom mold diameter and the upward force required by the piston to drive the bottom mold to push the bottle bottom into a concave bottom. That is, when the bottom mold diameter is 64 mm and the required upward force is X kg, according to the formula:

[0012] P3=(P2*3.2*3.2*3.14+P1*60+X) / (5.3*5.3*3.14-0.7*0.7*3.14*2);

[0013] The calculated top pressure (P3) is precisely controlled by a proportional control valve, further reducing the impact force and improving the stability of the equipment.

[0014] The bottom mold cylinder device has a hollow interior of the support seat (3). The hollow interior of the support seat can be used to install bottom mold structural parts, and can also reduce weight, reduce impact force, and make the equipment run more stable.

[0015] The bottom mold cylinder device is provided with a wire routing channel (9) inside the piston (2), and an internal hollow guide column (10) is fixedly installed at the opening of the wire routing channel. The bottom of the cylinder body is provided with a guide column opening (11) adapted to the guide column (10), and the guide column extends from the guide column opening, and the guide column can slide together with the piston; the provided wire routing channel and guide column can be used for routing wires and signal lines, eliminating the complex structure of the oil circuit, reducing the weight of the piston, further reducing the impact force, and extending the service life.

[0016] An annular groove is provided on the inner side of the guide post opening, and an annular groove (12) is provided on the inner side of the guide post opening (11). A sealing ring (13) and a guide ring (14) are installed in the annular groove (12). In order to prevent air pressure leakage, sealing rings and guide rings are installed at the connection points of each component of the cylinder to ensure the airtightness of the device.

[0017] The bottom mold cylinder device is provided with an upper cushion (15) at the upper end of the cylinder. The upper cushion can further cushion the upward pressure and improve the stability of the device components. The piston rising stroke can also be controlled by changing the thickness of the upper cushion to adapt to the height of different bottles.

[0018] The bottom mold cylinder device is provided with a lower buffer pad (16) at the lower end of the cylinder. The lower buffer pad can further buffer the cylinder retraction pressure and improve the stability of the device components.

[0019] The bottom mold cylinder device is further connected to a connecting block (17) at the bottom of the cylinder body, and a pull nail (18) is further provided in the middle of the connecting block. The bottom mold locking mechanism can be connected to the bottom of the connecting block, and the connecting block and the bottom mold locking mechanism can be quickly connected and fixed by the pull nail.

Claims

1. A bottom mold cylinder device, comprising a cylinder body (1), a piston (2) inside the cylinder body (1) that can slide relative to the cylinder body, and a support seat (3) that passes through the top of the cylinder and is connected to the piston. The interior of the cylinder is divided into two chambers by the piston, the end with the support seat is a first chamber (4), and the end without the support seat is a second chamber (5), characterized in that: A first vent pipe joint (6) is provided at the bottom of the cylinder and is connected to the second chamber (5), forming a first air path; a second vent pipe joint (7) is provided on the side wall of the cylinder, and an air path channel (8) is further provided in the side wall of the cylinder, one end of the air path channel (8) is connected to the first chamber (4), and the other end is connected to the second vent pipe joint (7), forming a second air path; a constant air pressure (P1) is continuously introduced into the second air path, which forms a downward constant pressure together with the weight of the piston and the main blowing air pressure (P2) introduced when blowing the bottle; an upward pressure (P3) greater than the constant pressure is introduced into the first air path, and the cylinder is pushed upward; when the upward pressure (P3) is stopped from being introduced into the first air path, the cylinder descends.

2. A bottom mold cylinder device according to claim 1, characterized in that: The constant air pressure (P1), main blowing air pressure (P2) and top air pressure (P3) are controlled by proportional regulating valves to control the size of the incoming air pressure.

3. A bottom mold cylinder device according to claim 1, characterized in that: The interior of the support seat (3) is hollow.

4. A bottom mold cylinder device according to claim 1, characterized in that: The piston (2) is provided with a wire channel (9) inside, and a hollow guide post (10) is fixedly installed at the opening of the wire channel. The bottom of the cylinder body is provided with a guide post opening (11) adapted to the guide post (10). The guide post extends from the guide post opening and can slide along with the piston.

5. A bottom mold cylinder device according to claim 4, characterized in that: An annular groove (12) is provided inside the guide column opening (11), and a sealing ring (13) and a guide ring (14) are installed in the annular groove (12).

6. A bottom mold cylinder device according to claim 1, characterized in that: An upper buffer pad (15) is provided at the upper end of the interior of the cylinder.

7. The bottom mold cylinder device according to claim 1, characterized in that: A lower buffer pad (16) is provided at the lower end of the interior of the cylinder.

8. The bottom mold cylinder device according to claim 1, characterized in that: The bottom of the cylinder body is also connected to a connecting block (17), and a rivet (18) is also provided in the middle of the connecting block.

Images