Blow mould closure cam drive mechanism and method of mounting same

Abstract

The application discloses a bottle blowing machine mold sealing cam driving mechanism and a mounting method thereof, and belongs to the technical field of bottle blowing machines. The bottle blowing machine mold sealing cam driving mechanism comprises a lifting cam, wherein the lifting cam is provided with an ascending cam surface, a rest cam surface and a descending cam surface, and an auxiliary cam is further arranged above the front end of the descending cam surface. When the lifting roller rolls backward on the descending cam surface after leaving the rest cam surface, the auxiliary cam can limit the lifting roller upward, so that the lifting roller can roll closely on the descending cam surface. When the lifting roller rolls backward on the descending cam surface after leaving the rest cam surface, the auxiliary cam can limit the lifting roller upward, so that the adverse effects caused by the increased friction between the lifting cylinder and the high-pressure valve can be overcome. After leaving the rest cam surface, the lifting roller can roll closely on the descending cam surface, impact and noise are avoided, the service life of the lifting cam and the lifting roller is prolonged, and the stability of the whole bottle blowing machine is improved.

Description

Technical Field

[0001] This invention relates to the field of blow molding machines, and more specifically to a blow molding machine mold sealing cam drive mechanism. Background Technology

[0002] Before blowing a bottle, a cap needs to be placed to seal the mold. Since the cap must not interfere with the robotic arm during its lifting and lowering motion, its lifting mechanism is generally controlled by a lifting cam. The lifting cam is elongated and fixed to the blow molding machine frame. It has an ascending wheel surface, a resting wheel surface, and a descending wheel surface. Driven by the blow molding machine's main shaft, the lifting rollers of the cap in each blowing unit cycle from front to back, passing through the ascending wheel surface, resting wheel surface, and descending wheel surface, rolling on each surface. During this process, the lifting cylinder in the blowing unit presses down on the lifting rollers under low-pressure air, causing them to roll against the lifting cam. When the lifting roller rolls on the ascending wheel surface, the ascending wheel surface gradually lifts the lifting roller, causing the cap to rise. When the lifting roller rolls on the resting wheel surface, the cap remains at a constant height. When the lifting roller rolls on the descending wheel surface, the descending wheel surface gradually lowers the lifting roller, causing the cap to descend.

[0003] The force exerted by the low-pressure air on the lifting cylinder is constant. When the friction between the lifting cylinder and the high-pressure valve increases due to factors such as grease, it may result in insufficient pressing force on the lifting roller. When the lifting roller rolls from the resting wheel surface to the descending wheel surface, due to insufficient pressing force from the lifting cylinder, the lifting roller will briefly fly off the lifting cam because its descent acceleration is less than the acceleration of the lifting cam. Then, the lifting roller will quickly fall onto the descending wheel surface under the action of the lifting cylinder. At this time, the lifting roller will have a great impact on the descending wheel surface, which will generate a lot of noise and affect the life of the lifting cam. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a blow molding die sealing cam drive mechanism that enables the lifting roller to always roll in close contact with the lifting cam.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a sealing cam drive mechanism for a blow molding machine, comprising: a lifting cam fixed on the frame of the blow molding machine, wherein a rising wheel surface, a resting wheel surface, and a descending wheel surface are provided on the lifting cam, characterized in that: an auxiliary cam is also provided, wherein a limiting wheel surface is provided on the lower side of the auxiliary cam, and the auxiliary cam is located above the front end of the descending wheel surface. When the lifting roller leaves the resting wheel surface and rolls backward to the descending wheel surface, the limiting wheel surface on the auxiliary cam can limit the lifting roller, so that the lifting roller can roll closely against the descending wheel surface.

[0006] Furthermore, in the aforementioned blow molding die sealing cam drive mechanism, the auxiliary cam is fixed to the lifting cam.

[0007] Furthermore, in the aforementioned blow molding die sealing cam drive mechanism, two height adjustment units are provided on the lifting cam to adjust the height of the auxiliary cam. The two height adjustment units are arranged side by side and are respectively connected to the front and rear ends of the auxiliary cam. The structure of each height adjustment unit includes: a connecting seat, a connecting shaft, a washer, and an upper nut. The lower end of the connecting seat is fixed to the outer side of the lifting cam. A horizontal plate is provided on the upper end of the connecting seat above the lifting cam. A flat head, an upper threaded section, a positioning boss, and a lower threaded section are arranged sequentially from top to bottom on the connecting shaft. The connecting shaft is vertically inserted through the horizontal plate. The positioning boss is located below the horizontal plate. The washer is placed between the positioning boss and the horizontal plate. The upper nut is threadedly connected to the upper threaded section and rotates downward to abut against the upper surface of the horizontal plate. The positioning boss abuts against the washer, and the washer abuts against the lower surface of the horizontal plate. The connecting shaft is threadedly connected to the auxiliary cam through the lower threaded section. The height of the auxiliary cam can be adjusted by adjusting the thickness of the washer or by increasing or decreasing the number of washers.

[0008] Furthermore, in the aforementioned blow molding die sealing cam drive mechanism, the height adjustment unit is also provided with a lower nut, which is threadedly connected to the lower thread section and rotates downward to abut against the upper surface of the auxiliary cam and tighten the auxiliary cam.

[0009] Furthermore, in the aforementioned blow molding die sealing cam drive mechanism, a guide slope is provided on the lower front end of the auxiliary cam, which can guide the lifting roller into the space between the auxiliary cam and the lowering roller surface.

[0010] The installation method of the sealing cam drive mechanism for blow molding machine molds is as follows:

[0011] (1) Install the lifting cam on the blow molding machine frame, at which time the connecting seats in the two height adjustment units are fixed on the lifting cam;

[0012] (2) Screw the two lower nuts onto the lower threaded sections of their respective connecting shafts;

[0013] (3) By clamping the flat head on the connecting shaft with a wrench, the connecting shaft is driven to rotate, so that the two connecting shafts are screwed into the threaded holes on the front and rear ends of the auxiliary cam through their respective lower thread sections until they reach the bottom, so that the two connecting shafts are vertically threaded to the front and rear ends of the auxiliary cam.

[0014] (4) Rotate the two lower nuts downward until the two lower nuts abut against the auxiliary cam and tighten the auxiliary cam; at this time the two positioning bosses are at the same height;

[0015] (5) Insert the two connecting shafts vertically from bottom to top through their respective horizontal plates. Then screw the two upper nuts onto the upper threaded section of their respective connecting shafts. Then drive the two upper nuts to rotate downwards until they abut against the upper surface of their respective horizontal plates and the two positioning bosses abut against the lower surface of their respective horizontal plates.

[0016] (6) Start the blow molding machine and make the lifting roller enter between the lowering wheel surface of the auxiliary cam and the lifting cam. Then measure the installation gap between the lifting roller and the limiting wheel surface on the auxiliary cam. Prepare two sets of gaskets with the same thickness as the installation gap. The gasket set can be a thick gasket or multiple thin gaskets stacked together.

[0017] (7) Clamp the flat ends of the two connecting shafts and loosen the two upper nuts so that a gap is created between the two positioning bosses and their corresponding horizontal plates. Then insert the two sets of washers into the two gaps created. Next, clamp the flat ends of the two connecting shafts and tighten the two upper nuts so that the two sets of washers are clamped. At this time, the auxiliary cam is installed.

[0018] The advantages of this invention are as follows: When the lifting roller leaves the resting wheel surface and rolls backward to the lowering wheel surface, the mold sealing cam drive mechanism can use an auxiliary cam to limit the lifting roller to an upper limit, thereby overcoming the adverse effects caused by the increased friction between the lifting cylinder and the high-pressure valve. This allows the lifting roller to roll close to the lowering wheel surface after leaving the resting wheel surface, avoiding impact and noise, extending the service life of the lifting cam and the lifting roller, and increasing the overall stability of the blow molding machine. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the sealing cam drive mechanism for the blow molding machine according to the present invention.

[0020] Figure 2 for Figure 1 A cross-sectional structural diagram.

[0021] Figure 3 for Figure 2 A schematic diagram of the connecting shaft. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0023] like Figure 1 , Figure 2 , Figure 3As shown, the sealing cam drive mechanism of the blow molding machine includes: a long strip-shaped lifting cam 1 fixed on the blow molding machine frame; a rising wheel surface 2, a resting wheel surface 3, and a descending wheel surface 4 are provided on the lifting cam 1; an auxiliary cam 5 is also provided; a limit wheel surface is provided on the lower side of the auxiliary cam 5; the auxiliary cam 5 is located above the front end of the descending wheel surface 4; when the lifting roller leaves the resting wheel surface 3 and rolls backward onto the descending wheel surface 4, the limit wheel surface on the auxiliary cam 5 can limit the lifting roller, so that the lifting roller can roll closely against the descending wheel surface 4.

[0024] In this embodiment, for ease of installation, the auxiliary cam 5 is fixed to the lifting cam 1. Two height adjustment units 6 are provided on the lifting cam 1 to adjust the height of the auxiliary cam 5. The two height adjustment units 6 are arranged side-by-side and connected to the front and rear ends of the auxiliary cam 5, respectively. Each height adjustment unit 6 includes: a connecting seat 7, a connecting shaft 9, a washer 17, and an upper nut 14. The lower end of the connecting seat 7 is fixed to the outer surface of the lifting cam 1, and a horizontal plate 8 is provided on the upper end of the connecting seat 7, extending horizontally above the lifting cam 1. From top to bottom, the connecting shaft 9 is provided with a flat head 11, an upper threaded section 12, and a positioning boss 10. The lower threaded section 13 and the connecting shaft 9 are vertically mounted on the horizontal plate 8. The positioning boss 10 is located below the horizontal plate 8. The washer 17 is placed between the positioning boss 10 and the horizontal plate 8. The upper nut 14 is threaded onto the upper threaded section 12 and rotates downward to abut against the upper surface of the horizontal plate 8. The positioning boss 10 abuts against the washer 17, and the washer 17 abuts against the lower surface of the horizontal plate 8. The connecting shaft 9 is threadedly connected to the auxiliary cam 5 through the lower threaded section 13. The height of the auxiliary cam 5 can be adjusted by adjusting the thickness of the washer 17 or by increasing or decreasing the number of washer 17. The flat head 11 is provided to facilitate turning the connecting shaft 9 with a wrench.

[0025] The height adjustment unit 6 is also provided with a lower nut 15, which is threaded onto the lower thread section 13 and rotates downward to abut against the upper surface of the auxiliary cam 5 and tighten the auxiliary cam 5.

[0026] A guide ramp 16 is provided on the lower front side of the auxiliary cam 5. The guide ramp 16 can guide the lifting roller into the space between the auxiliary cam 5 and the lowering wheel surface 4.

[0027] The installation method of the blow molding die sealing cam drive mechanism is as follows:

[0028] (1) Install the lifting cam 1 on the blow molding machine frame. At this time, the connecting seat 7 in the two height adjustment units 6 is fixed on the lifting cam 1.

[0029] (2) Screw the two lower nuts 15 onto the lower thread section 13 of their respective connecting shafts 9;

[0030] (3) By clamping the flat head 11 on the connecting shaft 9 with a wrench, the connecting shaft 9 is driven to rotate, so that the two connecting shafts 9 are screwed into the threaded holes on the front and rear ends of the auxiliary cam 5 through their respective lower thread sections 13 until they reach the bottom, so that the two connecting shafts 9 are vertically threaded to the front and rear ends of the auxiliary cam 5.

[0031] (4) Rotate the two lower nuts 15 downward until the two lower nuts 15 abut against the auxiliary cam 5 and tighten the auxiliary cam 5; at this time the two positioning bosses 10 are at the same height;

[0032] (5) The two connecting shafts 9 are vertically inserted through their respective horizontal plates 8 from bottom to top. Then, the two upper nuts 14 are screwed onto the upper thread section 12 of their respective connecting shafts 9. Then, the two upper nuts 14 are driven to rotate downwards until they abut against the upper surface of their respective horizontal plates 8 and the two positioning bosses 10 abut against the lower surface of their respective horizontal plates 8.

[0033] (6) Start the blow molding machine and make the lifting roller enter between the lowering wheel surface 4 of the auxiliary cam 5 and the lifting cam 1. Then measure the installation gap between the lifting roller and the limiting wheel surface on the auxiliary cam 5. Prepare two sets of gaskets with the same thickness as the installation gap. The gasket set can be a thick gasket or multiple thin gaskets stacked together.

[0034] (7) Clamp the flat ends 11 of the two connecting shafts 9 and loosen the two upper nuts 14 so that a gap is created between the two positioning bosses 10 and their respective cross plates 8. Then insert the two shim sets into the two gaps created respectively. Then clamp the flat ends 11 of the two connecting shafts 9 and tighten the two upper nuts 14 so that the two shim sets are clamped respectively. At this time, the auxiliary cam 5 is installed.

Claims

1. A mold closure cam drive mechanism for a bottle blowing machine, comprising: The lifting cam is fixed on the rack of the bottle blowing machine, and the lifting cam is provided with an ascending cam surface, a rest cam surface and a descending cam surface, characterized in that an auxiliary cam is further provided, the lower side of the auxiliary cam is provided with a limiting cam surface, the auxiliary cam is arranged above the front end of the descending cam surface, when the lifting roller rolls backward on the descending cam surface after leaving the rest cam surface, the limiting cam surface on the auxiliary cam can limit the lifting roller, so that the lifting roller can roll closely on the descending cam surface; the auxiliary cam is fixed with the lifting cam; two height adjusting units for adjusting the height of the auxiliary cam are arranged on the lifting cam, the two height adjusting units are arranged side by side, and the two height adjusting units are respectively connected with the front and rear ends of the auxiliary cam; the structure of each height adjusting unit comprises a connecting seat, a connecting shaft, a gasket and a upper nut; the lower end of the connecting seat is fixed with the outer side of the lifting cam, the upper end of the connecting seat is provided with a horizontal plate transverse to the upper side of the lifting cam, the connecting shaft is vertically arranged on the horizontal plate, the gasket is arranged between the locating boss and the horizontal plate, the upper nut is threadedly connected with the upper threaded section and rotates downward to abut against the upper surface of the horizontal plate, the locating boss abuts against the gasket, the gasket abuts against the lower surface of the horizontal plate, the connecting shaft is threadedly connected with the auxiliary cam through the lower threaded section, and the height of the auxiliary cam can be adjusted by adjusting the thickness of the gasket or increasing or decreasing the number of the gaskets.

2. A bottle mould finish cam drive mechanism according to claim 1, characterised in that: The lower nut is further arranged in the height adjusting unit, the lower nut is threadedly connected with the lower threaded section and rotates downward to abut against the upper surface of the auxiliary cam to tighten the auxiliary cam.

3. A bottle mould finish cam drive mechanism according to claim 1 or claim 2, wherein: A guide inclined surface is arranged on the front end of the auxiliary cam, the guide inclined surface can guide the lifting roller to enter between the auxiliary cam and the descending cam surface.

4. The method of installing a bottle mould closure cam drive mechanism according to claim 2, characterised in that: The installation method is as follows: (1) the lifting cam is installed on the rack of the bottle blowing machine, at this time, the connecting seat in the two height adjusting units is fixed on the lifting cam; (2) the two lower nuts are respectively screwed on the lower threaded sections of the connecting shafts; (3) the flat head on the connecting shaft is clamped by a wrench to drive the connecting shaft to rotate, so that the two connecting shafts are respectively screwed into the threaded holes on the front and rear ends of the auxiliary cam through the lower threaded sections and reach the bottom, so that the two connecting shafts are respectively vertically and threadedly connected with the front and rear ends of the auxiliary cam; (4) the two lower nuts are driven to move downward until the two lower nuts abut against the auxiliary cam to tighten the auxiliary cam; at this time, the two locating bosses are at the same height; (5) the two connecting shafts are respectively vertically and downwardly arranged through the corresponding horizontal plates, then the two upper nuts are respectively screwed on the upper threaded sections of the connecting shafts, and then the two upper nuts are driven to rotate downward to abut against the upper surfaces of the corresponding horizontal plates and make the two locating bosses respectively abut against the lower surfaces of the corresponding horizontal plates; (6) the bottle blowing machine is started, the lifting roller enters between the auxiliary cam and the descending cam surface of the lifting cam, then the installation gap between the lifting roller and the limiting cam surface on the auxiliary cam is measured; two gasket groups with the same thickness as the installation gap are prepared, the gasket group can be a thick gasket or a plurality of thin gaskets stacked together; (7) clamp the flat head of the two connecting shafts, and loosen the two upper nuts, so that a gap is generated between the two positioning bosses and the respective corresponding horizontal plates, then insert the two gasket sets into the two gaps generated respectively, then clamp the flat head of the two connecting shafts, and tighten the two upper nuts, so that the two gasket sets are clamped respectively, at this time the auxiliary cam is installed.

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