Convenient lifting device for blow molding machine

Abstract

The utility model discloses a convenient lifting device of blow molding machine, including frame and setting work table, lifting mechanism on the frame, and work table has lifting end and lifting support part, and work table is supported on the frame through lifting support part, lifting mechanism has lifting pivot, eccentric assembly and lifting driver, and the eccentric assembly is set on lifting pivot and is installed on the frame through this eccentric assembly, and the both ends of lifting pivot still are connected with lifting end of work table, lifting driver sets up on work table and the output is transmission connection with lifting pivot, is used for driving lifting pivot eccentric rotation on eccentric assembly, and with lifting support part as fulcrum drives lifting end of work table to lift. Therefore, through drive lifting pivot directly drives the lifting end of work table to do arc lifting action, simplifies the lifting control structure of blow molding machine, reduces manufacturing cost and failure rate, shortens transmission chain, and improves the control precision of lifting angle of work table.

Description

Technical Field

[0001] This utility model relates to the field of plastic bottle processing equipment technology, and in particular to a convenient head-up device for a blow molding machine. Background Technology

[0002] A blow molding machine is an automated device that processes plastic preforms into hollow containers through an extrusion stretch blow molding process. It is widely used in industries such as daily chemicals, pharmaceuticals, and food and beverage. The blow molding process typically includes several steps: preform pretreatment, stretch blow molding, cooling and setting, and demolding. After the preform is extruded from the die, it needs to undergo a descaling process to remove excess material.

[0003] Because a lot of preforms will accumulate at the cutting position on the workbench during the preform overflow cutting process, these preforms will deform due to adhesion. In order to ensure product quality, the platform is usually raised to allow the preforms to flow and separate after cutting. For example, Chinese utility model patent CN222590657U, entitled "A Head-Up Device for a Plastic Blow Molding Extruder," includes a base, an eccentric shaft rotatably mounted on the base, a motor driving the eccentric shaft to rotate, a connecting seat rotatably mounted on the eccentric shaft and of similar length to the eccentric shaft, and a support platform hinged to the upper end of the connecting seat. Above the connecting seat, a pair of cantilever arms extend upwards at intervals. The support platform has a pair of hinge ears at positions corresponding to the two cantilever arms, and the cantilever arms are respectively positioned between the corresponding pairs of hinge ears and hinged by a hinge shaft. During operation, the motor drives the gearbox and output shaft to rotate, the output shaft drives the eccentric shaft to rotate around its head, the eccentric shaft pushes the connecting seat to rise, and the connecting seat pushes the support platform to rise via the hinge shaft. Since the support platform is connected to a heavy-duty multi-head support, the head-up action is achieved.

[0004] However, the existing technology still has the following drawbacks: 1. The head-up device of the existing blow molding extruder requires an axially mounted connecting seat on the eccentric shaft, then a cantilever is set on the connecting seat, a hinge lug is set on the support platform, and finally the hinge lug and cantilever are assembled through the hinge shaft. This results in an overly complex structural design of the blow molding extruder, increasing the manufacturer's manufacturing costs, resulting in a high equipment selling price and hindering market promotion. In addition, the complex structural design makes it prone to various failures, leading to higher maintenance and repair costs in the later stages. 2. The eccentric shaft of the head-up device needs to pass through the connecting seat, cantilever, hinge shaft, and support platform in sequence to reach the working platform. With multiple stages of transmission structure in between, there will be a large error when adjusting the head-up angle and accuracy of the working platform. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a convenient head-up device for a blow molding machine.

[0006] The purpose of this utility model is achieved by the following technical solution: a convenient head-up device for a blow molding machine, including a frame and a worktable and a head-up mechanism disposed on the frame, the worktable having a lifting end and a lifting support part, the worktable being supported on the frame by the head-up support part;

[0007] The head-up mechanism has a head-up rotating shaft, an eccentric component, and a head-up driver. The eccentric component is sleeved on the head-up rotating shaft and mounted on the frame through the eccentric component. Both ends of the head-up rotating shaft are also connected to the lifting end of the worktable.

[0008] The head-up driver is mounted on the worktable and its output end is connected to the head-up rotating shaft for driving the head-up rotating shaft to rotate eccentrically on the eccentric assembly, and to drive the lifting end of the worktable to rise and fall with the lifting support as the fulcrum.

[0009] Furthermore, the eccentric assembly has an eccentric wheel and an eccentric support. The eccentric support is mounted on the frame, and the two ends of the head-up rotating shaft are fitted with the eccentric wheel and mounted on the eccentric support through the eccentric wheel.

[0010] Furthermore, the lifting end of the worktable is provided with a connecting seat, and both ends of the head-up rotating shaft are rotatably connected to the connecting seat.

[0011] Furthermore, a lifting mechanism is provided on the frame. The lifting mechanism has a lifting screw, a lifting seat, and a control rocker arm. Several lifting screws are provided and are vertically mounted on the frame through the lifting seat. The upper ends of the several lifting screws are correspondingly connected to the eccentric component of the lifting mechanism and the lifting support of the worktable. A lifting gear is also provided on the lifting screw. The control rocker arm is drivenly connected to the lifting gear and is used to control the lifting screw to spiral up and down on the lifting seat to lift or lower the worktable.

[0012] Furthermore, the lifting mechanism also has a drive gear and a transmission belt. The drive gear is connected to the lifting gear on the lifting screw via the transmission belt. One end of the control rocker arm is coaxially driven with the drive gear via a reversing transmission device, and the other end is provided with a manual crank.

[0013] Furthermore, the lifting mechanism also has a drive gear and a transmission belt. The drive gear is connected to the lifting gear on the lifting seat via the transmission belt. One end of the control rocker is coaxially driven with the drive gear via a reversing transmission device, and the other end is equipped with a lifting driver.

[0014] Furthermore, at least two lifting screws are arranged at the lifting end of the worktable, and the two lifting screws correspond to the two ends of the head-up rotating shaft and are connected to the eccentric assembly.

[0015] Furthermore, at least two lifting screws are arranged in the lifting support part of the worktable, and the upper ends of the two lifting screws are movably connected to the lifting support part through a swing seat.

[0016] Furthermore, the head-up angle of the workbench is set to 0-45°.

[0017] Furthermore, the head-up pivot rotates 180° as the lifting cycle for raising the worktable to its maximum angle or lowering it to its minimum angle.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: The head-up mechanism of this application embodiment is directly rotatably connected to the lifting end of the worktable through the lifting shaft, and assembled with the frame through the eccentric component. Under the drive of the head-up driver, the head-up shaft rotates eccentrically on the frame through the eccentric component, while driving the lifting end of the worktable to make arc-shaped lifting and lowering movements with the lifting support as the fulcrum. Compared with the existing head-up structure design of blow molding machines, the multi-stage transmission between the eccentric shaft, connecting seat, cantilever, hinge shaft, and support platform is eliminated. The lifting end of the worktable is directly driven to make arc-shaped lifting and lowering movements by driving the head-up shaft, thereby simplifying the head-up control structure of the blow molding machine, reducing the number of parts used, and reducing manufacturing costs and failure rates. Moreover, after the transmission chain is shortened, the control accuracy of the head-up angle of the worktable is improved, and the head-up angle control error of the worktable is reduced from ±2° to ±0.5°. Attached Figure Description

[0019] Figure 1 This is a perspective view of the convenient head-up device of the blow molding machine in a preferred embodiment of the present invention;

[0020] Figure 2 This is a top view schematic diagram of the assembly relationship between the worktable, the head-up mechanism and the lifting mechanism of the convenient head-up device of the blow molding machine in a preferred embodiment of the present utility model.

[0021] Figure 3 This is a top-view schematic diagram showing the assembly relationship between the worktable, the head-up mechanism, and the lifting mechanism of the convenient head-up device for a blow molding machine in a preferred embodiment of the present invention.

[0022] Figure 4 This is a partial sectional view of the convenient head-up device of the blow molding machine in a preferred embodiment of the present invention.

[0023] Figure 5 for Figure 4 Enlarged diagram of point A in the middle.

[0024] In the picture:

[0025] 10. Rack;

[0026] 20. Workbench; 201. Lifting end; 202. Lifting support section;

[0027] 30. Head-up mechanism; 301. Head-up shaft; 302. Eccentric assembly; 3021. Eccentric wheel; 3022. Eccentric support; 303. Head-up actuator;

[0028] 40. Connecting seat;

[0029] 50. Lifting mechanism; 501. Lifting screw; 502. Lifting seat; 5021. Lifting gear; 503. Control rocker arm; 504. Manual crank; 505. Drive gear; 506. Transmission belt; 507. Directional drive.

[0030] 60. Swinging seat. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] like Figure 1-5 As shown, a convenient head-up device for a blow molding machine is used to process plastic preforms into hollow containers, and is widely used in the daily chemical, pharmaceutical, and food and beverage industries. The convenient head-up device for the blow molding machine includes a frame 10, a worktable 20, and a head-up mechanism 30. The frame 10 adopts a welded steel frame structure to provide overall support. The worktable 20 is located above the frame 10 and is divided into a lifting end 201 (front end) and a lifting support part 202 (the bottom and rear end of the worktable 20, serving as a fulcrum for head-up operation). The lifting support part 202 of the worktable 20 is hinged to the frame 10, forming two or more fixed fulcrums at the bottom of the worktable 20.

[0033] The head-up mechanism 30 includes a head-up shaft 301, an eccentric assembly 302, and a head-up driver 303. The head-up shaft 301 is horizontally positioned above the lifting end 201 of the worktable 20, and both ends of the head-up shaft 301 are movably connected to the worktable 20 via connecting seats 40. For example, the connecting seats 40 are U-shaped cast steel parts, fixed to both sides of the surface of the lifting end 201 of the worktable 20. Both ends of the head-up shaft 301 pass through the sidewalls of the connecting seats 40 and are rotatably connected via self-aligning roller bearings, adapting to the slight deflection when the lifting angle of the worktable 20 changes. The connecting seats 40 also absorb the sway stress of the worktable 20, extending the life of the shaft. Preferably, the bearings of the connecting seats 40 can adopt a detachable pressure cap structure to reduce replacement time.

[0034] The eccentric assembly 302 consists of an eccentric wheel 3021 and an eccentric support 3022. The eccentric support 3022 is fixed on both sides of the frame 10. The eccentric wheel 3021 is interference-fitted onto both ends of the head-up shaft 301 and embedded in the circular groove of the eccentric support 3022. The circular groove of the eccentric support 3022 is equipped with a lubricating bearing for assembly with the eccentric wheel 3021. An oil injection hole can also be opened in the eccentric support 3022 for oil injection to reduce frictional resistance, prevent radial movement, and achieve radial assembly constraint, so that the head-up shaft 301 can rotate freely eccentrically on the eccentric support 3022 via the eccentric wheel 3021.

[0035] The head-up actuator 303 uses a servo motor and is mounted on the side of the worktable 20. The output end of the head-up actuator 303 is coaxially connected to the head-up rotating shaft 301 via a coupling. During operation, the head-up actuator 303 is started to drive the head-up rotating shaft 301 to rotate. The eccentric wheel 3021 rotates eccentrically within the eccentric support 3022 along with the shaft. It is connected to the worktable 20 via the connecting seat 40, so that the lifting end 201 of the worktable 20 performs an arc-shaped lifting and lowering motion with the lifting support 202 as the fulcrum.

[0036] In this embodiment, the head-up mechanism 30 is directly rotatably connected to the lifting end 201 of the worktable 20 via the lifting shaft, and assembled with the frame 10 via the eccentric assembly 302. Driven by the head-up driver 303, the head-up shaft 301 rotates eccentrically on the frame 10 via the eccentric assembly 302, while simultaneously driving the lifting end 201 of the worktable 20 to perform an arc-shaped lifting and lowering motion with the lifting support 202 as the fulcrum. Compared with the existing head-up design of blow molding machines, the multi-stage transmission between the eccentric shaft, connecting seat 40, cantilever, hinge shaft, and support platform is eliminated. Instead, the head-up shaft 301 directly drives the lifting end 201 of the worktable 20 to perform an arc-shaped lifting and lowering motion, thereby simplifying the head-up control structure of the blow molding machine, reducing the number of components used, and lowering manufacturing costs and failure rates. Moreover, after the transmission chain is shortened, the control accuracy of the head-up angle of the worktable 20 is improved, and the head-up angle control error of the worktable 20 is reduced from ±2° to ±0.5°.

[0037] The frame 10 is also equipped with a lifting mechanism 50, which includes a lifting screw 501, a lifting seat 502, a control rocker arm 503, a drive gear 505 and a transmission belt 506. There are four lifting screws 501, which are arranged in two groups on the frame 10. Each lifting screw 501 is vertically installed on the frame 10 through the lifting seat 502.

[0038] Furthermore, two of the lifting screws 501 are installed on the lifting end 201 of the worktable 20. The upper ends of the two lifting screws 501 pass through the surface of the worktable 20 and are directly connected to the eccentric support 3022 above the worktable 20, providing an eccentric rotation support foundation for the eccentric assembly 302 on the frame 10. In addition, since the head-up shaft 301 is installed on the eccentric support 3022 through the eccentric wheel 3021, and both ends of the head-up shaft 301 are connected to the worktable 20 through the connecting seat 40, the two lifting screws 501 connected to the eccentric support 3022 can also provide stable support for the lifting end 201 of the worktable 20 on the frame 10.

[0039] The other two lifting screws 501 are installed on the lifting support part 202 of the worktable 20. The upper ends of the two lifting screws 501 are hinged to the swing seat 60. The swing seat 60 is connected to the lifting support part 202 at the bottom of the worktable 20, allowing the worktable 20 to swing up and down on the lifting screws 501 without obstruction or jamming through the swing seat 60.

[0040] This design, using at least four lifting screws 501 to lift synchronously, ensures that the worktable 20 does not tilt during lifting and that the flatness error is controlled within a reasonable range.

[0041] The lifting seat 502 has a hollow interior with threaded holes, through which it engages with the lifting screw 501. Each lifting screw 501 is fitted with a lifting gear 5021. The drive gear 505 is mounted on the frame 10 via a mounting plate, and a tensioning pulley is provided on each side of the drive gear 505. In the transmission arrangement, the drive gear 505 is connected to each lifting gear 5021 via a transmission belt 506, and the transmission belt 506 is tightened by the two tensioning pulleys.

[0042] In manual operation mode, one end of the control joystick 503 is coaxially connected to the drive gear 505 via a reversing transmission 507, and the other end of the control joystick 503 extends outward from the frame 10 and is equipped with a manual crank 504. The operator can control the drive gear 505 to rotate by holding the manual crank 504, thereby synchronously driving the lifting screws 501 and controlling the lifting of the worktable 20. In electric operation mode, the control joystick 503 is replaced by a servo motor, which is automatically controlled by a PLC program, improving the lifting control accuracy.

[0043] In this embodiment, the maximum tilt angle of the worktable 20 is set to 45° by the tilt mechanism 30. A limit sensor can be optionally installed to stop the tilt driver 303. If necessary, an angle scale can be installed on the side wall of the frame 10 for easy daily observation. Furthermore, an angle sensor can be added to link with the PLC, and the tilt driver 303 can receive PLC program instructions to preset any angle of the worktable 20 (continuously adjustable from 0-45°).

[0044] When the head-up mechanism 30 controls the head-up operation of the worktable 20, a rotary encoder can be optionally configured on the head-up shaft 301. For example, when the head-up driver 303 rotates 180° forward, the high point of the eccentric wheel 3021 rotates upward to a certain high point area, at which time the worktable 20 is raised to its maximum angle (45°); when the head-up driver 303 rotates 180° in the opposite direction, the high point of the eccentric wheel 3021 rotates downward to a certain low point area, and the worktable 20 smoothly falls back to the horizontal position (0°) under the action of gravity. Therefore, the 180° rotation cycle design of the head-up shaft 301 achieves precise control throughout the entire stroke, improves repeatability, and avoids damage to components caused by excessive lifting and lowering.

[0045] The lifting control process of the convenient head-up device for the blow molding machine provided in this embodiment is as follows:

[0046] (1) In the initial state, the worktable 20 is in a horizontal position (0°), and the eccentric wheel 3021 rotates downward from its high point to a certain low point area;

[0047] (2) Head-up action: Sending a command to control the head-up driver 303 to start, driving the head-up shaft 301 to rotate, the eccentric wheel 3021 to rotate synchronously, the high point gradually moves up, and the lifting end 201 of the worktable 20 is directly driven to rise gradually through the head-up shaft 301; when the head-up shaft 301 rotates 180° in the forward direction, the high point of the eccentric wheel 3021 moves upward to a certain high point area, and the lifting end 201 of the worktable 20 is raised to the 45° limit position;

[0048] (3) Reset action: When the head-up rotating shaft 301 rotates 180° in the opposite direction, the high point of the eccentric wheel 3021 rotates downward to a certain low point area, and the worktable 20 falls back to the horizontal position.

[0049] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A convenient head-up device for a blow molding machine, characterized in that, It includes a frame and a worktable and a lifting mechanism mounted on the frame. The worktable has a lifting end and a lifting support part. The worktable is supported on the frame by the lifting support part. The head-up mechanism has a head-up rotating shaft, an eccentric assembly, and a head-up driver. The eccentric assembly is sleeved on the head-up rotating shaft and mounted on the frame through the eccentric assembly. Both ends of the head-up rotating shaft are connected to the lifting end of the worktable. The head-up driver is mounted on the worktable and its output end is connected to the head-up rotating shaft for driving the head-up rotating shaft to rotate eccentrically on the eccentric assembly, and to drive the lifting end of the worktable to rise and fall with the lifting support as the fulcrum.

2. The convenient head-up device for a blow molding machine as described in claim 1, characterized in that, The eccentric assembly has an eccentric wheel and an eccentric support. The eccentric support is mounted on the frame. The two ends of the head-up rotating shaft are fitted with the eccentric wheel and are mounted on the eccentric support through the eccentric wheel.

3. The convenient head-up device for a blow molding machine as described in claim 1, characterized in that, The lifting end of the worktable is provided with a connecting seat, and the two ends of the lifting shaft are rotatably connected to the connecting seat.

4. The convenient head-up device for a blow molding machine as described in claim 1, characterized in that, The frame is equipped with a lifting mechanism, which includes a lifting screw, a lifting seat, and a control rocker. Several lifting screws are provided and are vertically mounted on the frame through the lifting seat. The upper ends of the lifting screws are correspondingly connected to the eccentric component of the lifting mechanism and the lifting support of the worktable. The lifting screw is also equipped with a lifting gear. The control rocker is drivenly connected to the lifting gear and is used to control the lifting screw to spiral up and down on the lifting seat to lift or lower the worktable.

5. The convenient head-up device for a blow molding machine as described in claim 4, characterized in that, The lifting mechanism also has a drive gear and a transmission belt. The drive gear is connected to the lifting gear on the lifting screw via the transmission belt. One end of the control rocker is coaxially driven with the drive gear via a reversing transmission device, and the other end is provided with a manual crank.

6. The convenient head-up device for a blow molding machine as described in claim 4, characterized in that, The lifting mechanism also has a drive gear and a transmission belt. The drive gear is connected to the lifting gear on the lifting seat via the transmission belt. One end of the control rocker is coaxially driven with the drive gear via a reversing transmission device, and the other end is equipped with a lifting driver.

7. The convenient head-up device for a blow molding machine as described in claim 4, characterized in that, At least two lifting screws are arranged at the lifting end of the worktable, and the two lifting screws correspond to the two ends of the head-up rotating shaft and are connected to the eccentric assembly.

8. The convenient head-up device for a blow molding machine as described in claim 4, characterized in that, At least two lifting screws are arranged in the lifting support part of the worktable, and the upper ends of the two lifting screws are movably connected to the lifting support part through a swing seat.

9. The convenient head-up device for a blow molding machine as described in any one of claims 1-8, characterized in that, The head-up angle of the workbench is set to 0-45°.

10. The convenient head-up device for a blow molding machine as described in any one of claims 1-8, characterized in that, The head-up pivot rotates 180° as the lifting cycle for raising the worktable to its maximum angle or lowering it to its minimum angle.

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