Upper nozzle cutting line for blow molding processing

Abstract

The utility model provides an upper nozzle cutting line for blow molding processing, and belongs to the technical field of blow molding processing. Comprising a primary cutting station and a secondary cutting station, the secondary cutting station comprises a mounting frame, a rotating roller located below an outlet of a conveying belt, two clamping pieces located on the two sides of the rotating roller correspondingly, a front push plate, a rear push plate and a secondary cutting knife, and the front push plate and the rear push plate are both controlled through an air cylinder; the clamping piece comprises main rollers rotationally connected to the mounting frame and secondary rollers located on one side of the main rollers, the two main rollers, the two secondary rollers and the rotating roller form a positioning structure capable of clamping a bottle body, the main rollers and the rotating roller are hollow rollers, two insertion rods inserted into the two main rollers respectively are fixedly arranged on the front push plate, and the two insertion rods are fixedly connected to the front push plate. The rear push plate is rotationally connected with a driving rod in spline connection with the rotating roller, the rear push plate is further provided with a positioning rod capable of being inserted into a bottle opening, and the front push plate is provided with a positioning block corresponding to the bottom of a bottle body; and the secondary cutting knife is controlled by a lifting device. The device has the advantages of high precision and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of blow molding processing and relates to a water inlet cutting line for blow molding processing. Background Art

[0002] In the blow molding process of plastic containers, the extruder first extrude a semi-molten tube billet. When the tube billet reaches a certain length, the mold moves to the head position to close the bottom of the tube billet and hold the tube billet. The circular cutter cuts the tube billet into sections. Then the mold moves to the blow molding station, and the blow rod enters the tube billet to inflate the inside, causing the tube billet to expand until it is close to the inner wall of the mold and formed, thereby forming a semi-finished product with an upper water inlet and a lower water inlet. The lower water inlet is often separated from the bottle body by breaking it off, while the upper water inlet needs to be cut online after the mold is opened. Among the existing upper water inlet cutting methods, a common method is to put the bottle body online and control the bottle body to rotate during the translation process, so that the bottle body contacts the cutter set in the moving path and the upper water inlet is cut off.

[0003] The cutting method of the nozzle in the blow molding process has low cutting accuracy, and may even scratch the bottle body. The cutting position is also uneven. This is because in the process of controlling the translation of the workpiece on the conveyor belt, the small belt located on one side of the conveyor belt is used to drive the workpiece to rotate. The linear speed of the small belt is different from that of the conveyor belt, which enables the workpiece to slowly rotate during the translation on the conveyor belt, and completes the ring cutting of the nozzle in the process of contacting the blade on the side of the conveyor belt. It is not difficult to see from the above nozzle cutting process that the position of the ring cutting knife is fixed. Only when the workpiece is completely pressed against the conveyor belt and maintained in a vertical state, the cutting position is accurate. If the workpiece is tilted, "off the ground" and stuck to each other during the movement and rotation process, the cutting position and cutting effect of the set position cannot be achieved. Especially for thin-walled and lightweight plastic bottles and plastic bottles with a large height-to-diameter ratio, the probability of defective products in the cutting process will increase significantly. The existence of the upper nozzle substantially increases the height-to-diameter ratio of the uncut upper nozzle workpiece, and the irregularity of the upper nozzle also affects the stability of the workpiece's online movement. Therefore, the existing upper nozzle cutting method is not suitable for high-quality blow molding technology. Utility Model Content

[0004] The purpose of the utility model is to provide a water inlet cutting line for blow molding in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is how to improve the cutting accuracy.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a water inlet cutting line for blow molding processing, characterized in that it includes a primary cutting station and a secondary cutting station, the primary cutting station includes a conveyor belt, a primary cutting knife, a rotating belt and a knocking rod, the rotating belt is located on one side of the conveyor belt, the inner side of the rotating belt is in contact with the bottle body, the primary cutting knife is fixed on a mounting block for mounting the rotating belt, the primary cutting station cuts the water inlet part, the secondary cutting station includes a mounting frame, a roller located below the conveyor belt outlet, two clamping members respectively located on both sides of the roller, a front push plate, a rear push plate and a secondary cutting knife, the front push plate and the rear push plate are both controlled by a cylinder, the clamping The holding member includes a main roller rotatably connected to the mounting frame and a secondary roller located on one side of the main roller, the main roller and the secondary roller are connected by two connecting arms, the main roller and the secondary roller are both rotatably connected to the connecting arms, two main rollers, two secondary rollers and a rotating roller form a positioning structure capable of clamping the bottle body, the main roller and the rotating roller are both hollow rollers, two insertion rods respectively inserted in the two main rollers are fixedly arranged on the front push plate, a driving rod spline-connected to the rotating roller is rotatably connected to the rear push plate, the driving rod is connected to a motor, a positioning rod capable of being inserted into the bottle mouth is also arranged on the rear push plate, and a positioning block corresponding to the bottom of the bottle body is arranged on the front push plate; the secondary cutting knife is controlled by a lifting device.

[0006] Furthermore, the insert rod has a threaded rib on the outside, and the main roller has a threaded guide groove that cooperates with the threaded rib.

[0007] Furthermore, an adhesive tape is pulled between the main roller and the corresponding secondary roller.

[0008] Furthermore, the positioning rod is a blowing rod connected to an air source, and the positioning block has a protruding steel ball on one side close to the bottom of the bottle body, and the steel ball is rotatably connected to the positioning block.

[0009] Furthermore, a plurality of limit rods are alternately arranged on the rotating belt.

[0010] The workpiece to be cut at the water outlet is fed into the entrance of the conveyor belt. Under the action of the limit rods on the rotating belt, the positioning of a workpiece is completed between adjacent limit rods, and the conveyor belt drives the workpiece to translate. There is a difference in the linear speed of the transmission belt and the conveyor belt, which causes the workpiece to rub on the conveyor belt and rotate. The primary cutting knife cuts the upper part of the water outlet, and reserves a small part on the bottle body. This approach can not only avoid the situation where the single cutting station, which fails to accurately position the workpiece, forms defective products due to cutting accuracy problems, but also reduce the height-to-diameter ratio of the workpiece. Subsequently, the workpiece is knocked down at the end of the conveyor belt by the knocking down rod. The knocking down rod is located above the middle of the bottle body, so that the bottom of the workpiece falls into the secondary cutting station in advance. In the secondary cutting station, two main rollers, two secondary rollers and one rotating roller form a workpiece accommodating space with a length greater than the length of the workpiece, and the front push plate It moves synchronously with the rear push plate. Before the workpiece falls into the accommodation space, the front push plate and the rear push plate are both away from the accommodation space. After the workpiece falls in, the cylinder controls the front push plate and the rear push plate to approach each other. The insertion rod controls the main roller to rotate during the insertion into the main roller. The two clamps turn inward to complete the wrapping and pressing of the upper part of the bottle body. At the same time, the positioning block is also pushed to the position where the workpiece and the bottle bottom contact, and the workpiece is pushed to the set position. In addition, the rear push plate, which moves synchronously with the front push plate, inserts the blowing rod into the bottle mouth and inflates the bottle body cavity. The motor controls the rotation of the roller to rotate the bottle body, and the secondary cutting knife moves down to the cutting position to complete the cutting of the remaining part of the upper water inlet. After the cutting is completed, the front push plate and the rear push plate are reset, and the two clamps turn outward to loosen the workpiece. The airflow blows up to move the bottle body to the position of the two insertion rods. The two insertion rods are smaller in diameter, allowing the bottle body to fall between the two insertion rods to complete the unloading. In this way, the cutting of the remaining part of the upper water inlet of a workpiece is completed, and this is repeated.

[0011] It is not difficult to see from the description of the above working process that the positioning of the workpiece is achieved through the synchronous action of the front push plate and the rear push plate. The structure is simple and reliable, the wrapping positioning and moving position of the workpiece are accurate, and the secondary cutting knife can be away from the workpiece when the workpiece enters the secondary cutting station and before positioning to avoid scratches. The airflow and the positioning block are blown to achieve semi-contact positioning of the workpiece. The airflow can also be used as a material unloading after cutting is completed.

[0012] The water inlet is left when the inflation needle is inserted during blow molding. Its entrance is very small. If it is not cut once, it will not only be irregular but also impossible to position for blowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the upper water inlet cutting line.

[0014] Figure 2 yes Figure 1 Exploded diagram of .

[0015] Figure 3It is a structural diagram of a cutting station.

[0016] Figure 4 It is a structural diagram of the secondary cutting station.

[0017] Figure 5 It is a cutting flow chart of the workpiece during the secondary cutting process.

[0018] Figure 6 It is a cross-sectional view of the clamp holding the workpiece.

[0019] Figure 7 It is a schematic diagram of the double cutting process of the water outlet of a plastic bottle.

[0020] In the figure, 11, conveyor belt; 12, primary cutting knife; 13, rotating belt; 14, knocking rod; 15, limit rod; 21, rotating roller; 211, driving rod; 212, motor; 22, clamping part; 221, main roller; 222, secondary roller; 223, insertion rod; 224, adhesive tape; 23, front push plate; 24, rear push plate; 25, secondary cutting knife; 26, cylinder; 27, positioning rod; 28, positioning block. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1-Figure 7As shown, the water inlet cutting line for blow molding processing includes a primary cutting station and a secondary cutting station. The primary cutting station includes a conveyor belt 11, a primary cutting knife 12, a rotating belt 13 and a knocking rod 14. The rotating belt 13 is located on one side of the conveyor belt 11, and the inner side of the rotating belt 13 is in contact with the bottle body. The primary cutting knife 12 is fixed on a mounting block for mounting the rotating belt 13. The primary cutting station cuts the water inlet part. The secondary cutting station includes a mounting frame, a roller 21 located below the outlet of the conveyor belt 11, two clamping members 22 located on both sides of the roller 21, a front push plate 23, a rear push plate 24 and a secondary cutting knife 25. The front push plate 23 and the rear push plate 24 are both controlled by a cylinder 26. The clamping member 22 includes a main roller 221 rotatably connected to the mounting frame and a main roller 221 located at the main roller 222. The secondary roller 222 on one side of the roller 221 is connected to the main roller 221 and the secondary roller 222 by two connecting arms. The main roller 221 and the secondary roller 222 are both rotatably connected to the connecting arms. The two main rollers 221, the two secondary rollers 222 and the rotating roller 21 form a positioning structure that can clamp the bottle body. The main roller 221 and the rotating roller 21 are both hollow rollers. Two insertion rods 223 respectively inserted in the two main rollers 221 are fixedly arranged on the front push plate 23. A driving rod 211 spline-connected to the rotating roller 21 is rotatably connected on the rear push plate 24. The driving rod 211 is connected to a motor 212. The rear push plate 24 is also provided with a positioning rod 27 that can be inserted into the bottle mouth. The front push plate 23 is provided with a positioning block 28 corresponding to the bottom of the bottle body; the secondary cutting knife 25 is controlled by a lifting device.

[0023] Furthermore, the insert rod 223 has a threaded rib on the outside, and the main roller 221 has a threaded guide groove that matches the threaded rib. The turning angle of the clamping member 22 is within 60 degrees in the two extreme positions of the insert rod 223 in the main roller 221, that is, it is turned outward when feeding, and turned inward to hold the bottle body when clamping after feeding.

[0024] A tape 224 is pulled between the main roller 221 and the corresponding secondary roller 222. The tape 224 can make the contact position between the bottle body and the tape 224 soft, and the tape 224 moves with the bottle body when the bottle body rotates, with small friction resistance, smooth rotation, and not easy to be misaligned along the height direction of the bottle body during the rotation process.

[0025] The positioning rod 27 is a blowing rod connected to the air source, and the positioning block 28 has a protruding steel ball on one side close to the bottom of the bottle body, and the steel ball is rotatably connected to the positioning block 28. When positioning the bottle body, the bottom is rolling friction, and its rotation resistance is small, while at the entrance, the bottle body is pressed by blowing, which is a contact-free pressing without rotation friction resistance.

[0026] A plurality of limiting rods 15 are arranged alternately on the rotating belt 13. The limiting rods 15 can limit the feeding speed and control the feeding order. Since the secondary cutting is cutting one by one, the limiting rods 15 can control the feeding interval.

[0027] The workpiece to be cut from the water outlet is fed into the entrance of the conveyor belt 11. Under the action of the limit rods 15 on the rotating belt 13, the positioning of a workpiece is completed between adjacent limit rods 15. The conveyor belt 11 drives the workpiece to translate. There is a difference in the linear speed between the transmission belt and the conveyor belt 11, so that the workpiece rubs on the conveyor belt 11 to form self-rotation. The cutting knife 12 cuts the upper part of the water outlet once, and a small part is reserved on the bottle body. This approach can not only avoid the failure of the cutting station to accurately position the workpiece, but also avoid the failure of the cutting station to accurately position the workpiece. The cutting method may cause defective products due to cutting accuracy problems. In addition, the height-to-diameter ratio of the workpiece can be reduced. Subsequently, the workpiece is knocked down at the end of the conveyor belt 11 by the knocking rod 14. The knocking rod 14 is located above the middle of the bottle body, so that the bottom of the workpiece falls into the secondary cutting station in advance. In the secondary cutting station, two main rollers 221, two secondary rollers 222 and a rotating roller 21 form a workpiece accommodating space with a length greater than the length of the workpiece. The front push plate 23 and the rear push plate 24 move synchronously. In operation, before the workpiece falls into the accommodating space, the front push plate 23 and the rear push plate 24 are both away from the accommodating space. After the workpiece falls into the accommodating space, the cylinder 26 controls the front push plate 23 and the rear push plate 24 to approach each other. During the insertion of the insertion rod 223 into the main roller 221, the main roller 221 is controlled to rotate, and the two clamping members 22 are turned inward to complete the wrapping and pressing of the upper part of the bottle body. At the same time, the positioning block 28 is also pushed to the position where the workpiece contacts the bottom of the bottle, and the workpiece is pushed to the set position. In addition, the front push plate 23 acts synchronously with the front push plate 23. The rear push plate 24 inserts the blowing rod into the bottle mouth, inflates the bottle body cavity, and the motor 212 controls the roller 21 to rotate, so that the bottle body rotates, and the secondary cutting knife 25 moves down to the cutting position to complete the cutting of the remaining part of the upper water inlet; after the cutting is completed, the front push plate 23 and the rear push plate 24 are reset, and the two clamping parts 22 are turned outward to loosen the workpiece, and the air flow is blown to move the bottle body back to the position of the two insertion rods 223. The two insertion rods 223 have a small diameter, allowing the bottle body to fall between the two insertion rods 223 to complete the unloading. In this way, the cutting of the remaining part of the upper water inlet of a workpiece is completed, and this process is repeated.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A water inlet cutting line for blow molding, characterized in that: The invention comprises a primary cutting station and a secondary cutting station, wherein the primary cutting station comprises a conveyor belt (11), a primary cutting knife (12), a rotating belt (13) and a knocking rod (14), wherein the rotating belt (13) is located on one side of the conveyor belt (11), the inner side of the rotating belt (13) contacts the bottle body, the primary cutting knife (12) is fixed on a mounting block for mounting the rotating belt (13), the primary cutting station cuts the upper water inlet part, and the secondary cutting station cuts the upper water inlet part. The conveyor belt (11) comprises a mounting frame, a rotating roller (21) located below the outlet of the conveyor belt (11), two clamping members (22) respectively located on both sides of the rotating roller (21), a front push plate (23), a rear push plate (24) and a secondary cutting knife (25), wherein the front push plate (23) and the rear push plate (24) are both controlled by a cylinder (26), the clamping member (22) comprises a main roller (221) rotatably connected to the mounting frame and a secondary roller (221) located on one side of the main roller (221). 22), a main roller (221) and a secondary roller (222) are connected via two connecting arms, the main roller (221) and the secondary roller (222) are both rotatably connected to the connecting arms, the two main rollers (221), the two secondary rollers (222) and a rotating roller (21) form a positioning structure capable of clamping the bottle body, the main roller (221) and the rotating roller (21) are both hollow rollers, and the front push plate (23) is fixedly provided with two rollers respectively inserted in the two main rollers ( The rear push plate (24) is rotatably connected to a driving rod (211) spline-connected to the rotating roller (21), and the driving rod (211) is connected to a motor (212). The rear push plate (24) is also provided with a positioning rod (27) capable of being inserted into the bottle mouth, and the front push plate (23) is provided with a positioning block (28) corresponding to the bottom of the bottle body; the secondary cutting knife (25) is controlled by a lifting device.

2. The water inlet cutting line for blow molding according to claim 1, characterized in that: The insert rod (223) has a threaded convex rib on the outside, and the main roller (221) has a threaded guide groove that matches the threaded convex rib.

3. The water inlet cutting line for blow molding according to claim 1, characterized in that: An adhesive tape (224) is pulled between the main roller (221) and the corresponding secondary roller (222).

4. A water inlet cutting line for blow molding according to claim 1, 2 or 3, characterized in that: The positioning rod (27) is a blowing rod connected to an air source, and the positioning block (28) has a protruding steel ball on one side close to the bottom of the bottle body, and the steel ball is rotatably connected to the positioning block (28).

5. A water inlet cutting line for blow molding according to claim 1, 2 or 3, characterized in that: A plurality of limiting rods (15) are arranged alternately on the rotating belt (13).

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