Anti-rotation mechanism in screw cap machine

Abstract

The application discloses a positive anti-rotation mechanism in a cap screwing machine, which comprises a cam and a plurality of anti-rotation units, the cam is sleeved outside a main shaft of the cap screwing machine, the cam is connected by a lower rest section, a rising section, an upper rest section and a falling section, each anti-rotation unit is fixed with the main shaft, and each anti-rotation unit comprises a supporting seat, a lifting rod, a roller, a hinged frame, two clamps, two swing arms and two guide pins, the lifting rod is installed on the supporting seat in a lifting mode, the roller is installed at the bottom of the lifting rod and is supported by the cam, the hinged frame is fixed at the top of the lifting rod, the bottoms of the two swing arms are hingedly connected with the two sides of the hinged frame respectively, the tops of the two swing arms are fixed with the two clamps respectively, guide grooves are arranged on the swing arms, and the two guide pins are fixed on the supporting seat and transversely pass through the two guide grooves respectively. The positive anti-rotation mechanism can quickly lift from the bottom of a bottle and actively clamp the bottom of the bottle body, and the cap screwing machine no longer depends on the pressure of a cap screwing head on a bottle opening support ring to passively prevent rotation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cap screwing machines, in particular to a positive anti-rotation mechanism in a cap screwing machine. BACKGROUND

[0002] When a bottle is rotating and capped in a cap screwing machine, the bottle cannot rotate with the cap, otherwise the cap cannot be screwed in place, the bottle opening and bottle body can be scratched, and other problems can occur, which cannot meet the requirements of customers on the sealing function and appearance of the bottle.

[0003] Generally, a stop rotation knife is used below the bottle opening support ring, and the downward force of the stop rotation knife on the bottle opening support ring is used to generate friction between the bottle opening support ring and the stop rotation knife to make the bottle opening support ring relatively stationary, so as to achieve the purpose of preventing the bottle from rotating. However, the use of the stop rotation knife to prevent the bottle from rotating has the following problems: the stop rotation knife is easy to wear and has a short service life, the bottle opening support ring is scratched by the stop rotation knife due to insufficient friction, the bottle body is scratched when rotating, and other problems. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a positive anti-rotation mechanism in a cap screwing machine without using a stop rotation knife.

[0005] In order to solve the above problems, the technical scheme adopted by the present application is: the active anti-rotation mechanism in the cap screwing machine, characterized by comprising: a cam and a plurality of anti-rotation units, the cam is fixedly sleeved outside the main shaft of the cap screwing machine, the wheel surface of the cam is sequentially and smoothly connected from the lower rest segment, the rising segment, the upper rest segment and the descending segment in the rotation direction of the main shaft of the cap screwing machine, each anti-rotation unit is arranged around the main shaft of the cap screwing machine and is fixed with the main shaft of the cap screwing machine, each anti-rotation unit corresponds to each cap screwing unit in the cap screwing machine one by one, and the structure of each anti-rotation unit comprises: a support seat fixed with the main shaft of the cap screwing machine, a lifting rod, a roller, a hinged frame, two clamping arms, two swing arms and two guide pins, the lifting rod is installed on the support seat in a lifting manner, the roller is installed at the bottom of the lifting rod and is supported by the cam, the roller can roll along the cam with the rotation of the main shaft of the cap screwing machine, the hinged frame is fixed at the top of the lifting rod, the bottoms of the two swing arms are hingedly connected to the left and right sides of the hinged frame respectively, the tops of the two swing arms are fixed with the two clamping arms respectively, the shaft bodies of the two swing arms are each provided with a guide groove arranged along the shaft body, and the two guide pins are fixed on the support seat and respectively transversely pass through the two guide grooves; when the roller rolls on the lower rest segment, the height of the lifting rod remains unchanged, the two clamping arms are in a low position and remain in an open state without hindering the bottle, then when the roller rolls on the rising segment, the lifting rod will lift the two swing arms, the two swing arms can drive the two clamping arms to close under the guidance of the two guide pins, so that the two clamping arms can be lifted and actively clamp the bottom of the bottle conveyed into the cap screwing machine, when the roller rolls on the upper rest segment, the height of the lifting rod remains unchanged, the two clamping arms are in a high position and remain in a state of clamping the bottom of the bottle, so as to prevent the bottle from rotating during the cap screwing process, and when the roller rolls on the descending segment, the lifting rod will lower the two swing arms, the two swing arms can drive the two clamping arms to open under the guidance of the two guide pins, so that the two clamping arms can be lowered and separated from the bottom of the bottle.

[0006] Further, the active anti-rotation mechanism in the cap screwing machine, wherein: a tension spring is further arranged, one end of the tension spring is connected with the hinged frame, the other end of the tension spring is connected with the support seat, and the tension spring can exert a downward force on the lifting rod, so that the roller can roll tightly against the cam.

[0007] Further, the active anti-rotation mechanism in the cap screwing machine, wherein: anti-skid strips are arranged on the clamping surfaces of the two clamping arms.

[0008] Further, the active anti-rotation mechanism in the cap screwing machine, wherein: the depth of the clamping cavity of the two clamping arms satisfies the following condition: after the two clamping arms clamp the bottom of the bottle, a gap is left between the bottom of the bottle and the bottom of the clamping cavity.

[0009] Further, the active anti-rotation mechanism in the aforementioned cap screwing machine, wherein: the support seat is provided with a mounting opening, the hinged frame is located in the mounting opening, a cross beam is arranged on the top of the mounting opening, and the two swing arms pass through the cross beam upwards, and the two guide pins are fixed to the cross beam.

[0010] The advantages of the present application are that: the two clamps in the active anti-rotation mechanism can quickly rise from the bottle bottom and actively clamp the bottle bottom, and no longer rely on the passive anti-rotation of the pressure of the cap screwing head on the bottle opening support ring; in addition, since the middle part of the bottle body is weak in strength and is easy to deform, and the bottle bottom is hard and not easy to deform, the one-week embracing mode is adopted to tightly embrace the lower part of the bottle body, which can increase the contact area, reduce the pressure on the bottle, reduce the deformation caused to the bottle body, increase the moment of the anti-rotation contact point, and achieve good anti-rotation effect. The circumferential interval from when the cap screwing machine just enters the bottle to when the cap screwing starts is small, the two clamps can be quickly raised with small amplitude and tightly embrace the bottom of the bottle body in a large area, the purpose of quickly anti-rotation of the bottle is achieved, the two clamps can also be quickly opened and lowered to separate from the bottle body after the cap screwing is completed, which does not affect the bottle to exit the cap screwing machine, and there is no sliding friction of the bottle body during the cap screwing stage, which can avoid scratching the bottle body. Since the two clamps embrace the bottle body during the cap screwing, the inclination and misalignment of the bottle body can be automatically adjusted, and the success rate of cap screwing can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The active anti-rotation mechanism in the cap screwing machine according to the present application in the state when the bottle is not entered.

[0012] Figure 2 The active anti-rotation mechanism in the cap screwing machine according to the present application in the state when the bottle is not entered.

[0013] Figure 3 The structure diagram of the anti-rotation unit. DETAILED DESCRIPTION

[0014] As shown in Figure 1 , Figure 2 , Figure 3 The active anti-rotation mechanism in the cap screwing machine, comprising: a cam 1 and a plurality of anti-rotation units 2, the cam 1 is fixedly sleeved outside the main shaft 7 of the cap screwing machine, the wheel surface of the cam 1 is sequentially and smoothly connected from the lower stop segment 3, the rising segment 4, the upper stop segment 5, and the descending segment 6 in the rotation direction of the main shaft 7 of the cap screwing machine, each anti-rotation unit 2 is arranged at intervals around the main shaft 7 of the cap screwing machine and is fixed to the main shaft 7 of the cap screwing machine, each anti-rotation unit 2 corresponds to each cap screwing unit 8 in the cap screwing machine one by one, Figure 1For clearly showing the cam 1, the anti-rotation unit 2 and the cap screwing unit 8 are only drawn one each. The structure of each anti-rotation unit 2 comprises a support base 9 fixed with the cap screwing machine main shaft 7, a lifting rod 10, a roller 11, a hinged frame 12, two clamping arms 13, two swing arms 14, and two guide pins 15. The lifting rod 10 is installed on the support base 9 in a lifting manner, the roller 11 is installed on the bottom of the lifting rod 10 and is supported by the cam 1, and the roller 11 can roll along the cam 1 with the rotation of the cap screwing machine main shaft 7. The hinged frame 12 is fixed on the top of the lifting rod 10, the bottoms of the two swing arms 14 are hingedly connected with the left and right sides of the hinged frame 12 respectively, the tops of the two swing arms 14 are fixed with the two clamping arms 13 respectively, the shafts of the two swing arms 14 are provided with guide grooves 16 arranged along the shafts, and the two guide pins 15 are fixed on the support base 9 and transversely pass through the two guide grooves 16 respectively. When the roller 11 rolls on the lower rest section 3, the height of the lifting rod 10 is unchanged, the two clamping arms 13 are in a low position and are kept in an open state without hindering the bottle. Then, when the roller 11 rolls on the rising section 4, the lifting rod 10 will lift the two swing arms 14, the two swing arms 14 can drive the two clamping arms 13 to close under the guidance of the two guide pins 15, so that the two clamping arms 13 can be lifted and actively clamp the bottom of the bottle 21 conveyed into the cap screwing machine. When the roller 11 rolls on the upper rest section 5, the height of the lifting rod 10 is unchanged, the two clamping arms 13 are in a high position and keep clamping the bottle bottom, so as to prevent the bottle 21 from rotating in the cap screwing process. When the roller 11 rolls on the descending section 6, the lifting rod 10 will lower the two swing arms 14, the two swing arms 14 can drive the two clamping arms 13 to open under the guidance of the two guide pins 15, so that the two clamping arms 13 can be lowered and separated from the bottom of the bottle 21.

[0015] In the embodiment, two tension springs 17 are also arranged, and the two tension springs 17 are symmetrically arranged on the front and rear sides of the support base 9. The two tension springs 17 are arranged symmetrically to make the lifting rod 10 bear force evenly and not be easily worn and abraded, and when one of the tension springs 17 fails, the other one can still make the anti-rotation mechanism work normally. One end of the tension spring 17 is connected with the hinged frame 12, and the other end of the tension spring 17 is connected with the support base 9. The tension spring 17 can exert a downward force on the lifting rod 10, so that the roller 11 can roll closely on the cam 1.

[0016] Anti-slip strips 18 are arranged on the clamping surfaces of the two clamping arms 13. The depth of the clamping cavities of the two clamping arms 13 satisfies the following condition: after the two clamping arms 13 clamp the bottle bottom, a gap a is left between the bottle bottom and the bottom of the clamping cavity.

[0017] In order to prevent the two clamps 13 from lifting the bottle 21 too high when clamping the bottle, a gap a is left between the bottom of the bottle and the bottom of the clamping cavity after the two clamps 13 clamp the bottom of the bottle. The gap a can also better adapt to the deviation in the overall height of the bottle 21. Since the middle part of the bottle body is weak and easy to deform, and the bottom of the bottle is hard and not easy to deform, the one-week ring clamping method is used to tightly clamp the lower part of the bottle body, which can increase the contact area, reduce the pressure on the bottle, reduce the deformation of the bottle body, increase the torque of the anti-rotation contact point, and achieve good anti-rotation effect. The circumferential interval of the bottle from the time when the cap machine enters the bottle to the time when the cap starts to rotate is small. The two clamps 13 in the active anti-rotation mechanism can be quickly raised and tightly clamped on the bottom of the bottle body with a small amplitude, achieving the purpose of quickly preventing the rotation of the bottle 21. After the cap is finished, the two clamps 13 can also be quickly opened and lowered to separate from the bottle body, without affecting the bottle 21 out of the cap machine. There is no sliding friction on the bottle body during the cap rotation stage, which can avoid scratching the bottle body. Since the two clamps 13 tightly clamp the bottle body during cap rotation, the bottle body can automatically adjust the skewing and misalignment, improving the success rate of cap rotation.

[0018] The two clamps 13 are quickly raised from the bottom of the bottle and actively clamp the bottom of the bottle body, and no longer rely on the pressure of the cap head support ring on the bottle mouth to passively prevent rotation. The mounting opening 19 is arranged on the support seat 9, the hinged frame 12 is located in the mounting opening 19, the cross beam 20 is arranged on the top of the mounting opening 19, the two swing arms 14 pass through the cross beam 20 upwards, and the two guide pins 15 are fixed on the cross beam 20. The above structure can optimize the mechanism.

Claims

1. An active anti-rotation mechanism in a capping machine, characterized in that: include: The machine comprises a cam and several anti-rotation units. The cam is fixedly mounted on the outside of the capping machine's main shaft. The cam's wheel surface smoothly connects end-to-end in the direction of rotation of the main shaft, consisting of a lower rest section, an ascending section, an upper rest section, and a descending section. Each anti-rotation unit is spaced apart around the main shaft and fixed to it. Each anti-rotation unit corresponds one-to-one with each capping unit in the capping machine. The structure of each anti-rotation unit includes: a support base fixed to the main shaft, a lifting rod, rollers, a hinge frame, two clamps, and two... The lifting arm, two guide pins, and lifting rod are mounted on the support base in a height-adjustable manner. Rollers are mounted at the bottom of the lifting rod and supported by a cam. As the capping machine's main shaft rotates, the rollers roll along the cam. A hinge frame is fixed to the top of the lifting rod. The bottoms of the two lifting arms are hinged to the left and right sides of the hinge frame, respectively. The tops of the two lifting arms are fixed to two clamps. Guide grooves are provided along the shaft of each of the two lifting arms. Two guide pins are fixed to the support base and pass laterally through the two guide grooves. When the rollers are at the bottom... When the roller rolls on the resting section, the lifting rod height remains constant, and the two clamps are in a low position that does not obstruct bottle feeding and remain open. Then, when the roller rolls on the rising section, the lifting rod will raise the two swing arms. Guided by two guide pins, the two swing arms can drive the two clamps to engage, allowing the two clamps to rise and actively clamp the bottom of the bottle being conveyed to the capping machine. When the roller rolls on the upper resting section, the lifting rod height remains constant, and the two clamps are in a high position, maintaining the clamping state on the bottle bottom to prevent the bottle from rotating during the capping process. When the rollers roll on the lowering section, the lifting rod will lower the two swing arms. Guided by two guide pins, the two swing arms can drive the two clamps to open, allowing the two clamps to descend and disengage from the bottom of the bottle. The depth of the clamping cavity of the two clamps meets the following requirements: after the two clamps clamp the bottom of the bottle, there is a gap between the bottom of the bottle and the bottom of the clamping cavity. An installation opening is provided on the support base, the hinge frame is located in the installation opening, and a crossbeam is mounted on the top of the installation opening. The two swing arms pass upward through the crossbeam respectively, and the two guide pins are fixed to the crossbeam.

2. The active anti-rotation mechanism in the capping machine according to claim 1, characterized in that: It is also equipped with a tension spring, one end of which is connected to the hinge frame and the other end of which is connected to the support base. The tension spring can apply a downward force to the lifting rod, so that the roller can roll tightly against the cam.

3. The active anti-rotation mechanism in the capping machine according to claim 1 or 2, characterized in that: Anti-slip strips are provided on the clamping surfaces of both clamps.

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