CN109928345B - Flexible tightening head and tightening method - Google Patents
Flexible tightening head and tightening method Download PDFInfo
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- CN109928345B CN109928345B CN201910351245.1A CN201910351245A CN109928345B CN 109928345 B CN109928345 B CN 109928345B CN 201910351245 A CN201910351245 A CN 201910351245A CN 109928345 B CN109928345 B CN 109928345B
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Abstract
The invention relates to a flexible tightening head and a tightening method, belongs to the technical field of packaging machinery, and solves the problem that the existing tightening device cannot meet the requirement of tightening a metal external thread bottle cap and a bottle body internal thread with large mass, poor elasticity and plasticity, small thread pitch and multiple turns. The flexible tightening head comprises a mounting base body, a telescopic rod and a spring sleeved on the telescopic rod, wherein the mounting base body is provided with a reducing through hole used for the telescopic rod to move up and down, and the longitudinal section of the reducing through hole is convex; one end of the telescopic rod is coaxially provided with a working part matched with the slotted hole at the top of the bottle cap, and the other end of the telescopic rod is provided with a limiting part for limiting the telescopic rod to slide downwards; the working part comprises an end head and a working cylinder, the diameter of the end head is smaller than or equal to the aperture of the slotted hole, and the diameter of the working cylinder is larger than the aperture of the slotted hole and smaller than or equal to the aperture of the lower part of the reducing through hole. The flexible tightening head can provide enough large tightening torque to adapt to automatic tightening of products with external threads, the tightening method is simple to operate, and the cost is obviously reduced.
Description
Technical Field
The invention relates to the technical field of packaging machinery, in particular to a flexible tightening head and a tightening method.
Background
The existing mature bottle cap screwing equipment can realize automatic screwing between a plastic bottle cap and a plastic bottle body and between a metal bottle cap and a glass bottle body, and is characterized in that:
1) the bottle cap is small in mass and mainly made of plastic or metal materials with good elastic and plastic properties;
2) the threads of the bottle cap are mainly internal threads, and the threads of the bottle body are mainly external threads;
3) the pitch of the thread is typically 2 to 3mm, the number of turns is typically 2 to 3 turns;
the tightening torque required in such cases is usually small, and the tightening principle is mainly realized by contacting the tightening head with the upper surface of the bottle cap and driving the bottle cap to rotate by the friction force between the contact surfaces, so as to realize automatic tightening.
The existing automatic bottle cap screwing device generally comprises a fastening piece (such as a screw, a nut and the like) and automatic bottle cap and bottle body screwing (such as a mineral water bottle, a glass can and the like), wherein the automatic bottle cap and bottle body screwing device is mostly suitable for screwing plastic bottle caps or metal internal thread bottle caps with small mass, good elastic plasticity (small rigidity), large thread pitch and few turns and external threads of bottle bodies, the screwing torque required by the situation is usually small, the screwing principle of the automatic bottle cap screwing device is mainly characterized in that the screwing head is in contact with the upper surface of the bottle cap, and the bottle cap is driven to rotate by the friction force between contact surfaces, so that the automatic screwing is realized. And aiming at the condition that the metal external thread bottle cap with large mass, poor elasticity and plasticity (large rigidity), small thread pitch and multiple turns is matched with the internal thread of the bottle body, the required tightening torque is usually large, obviously, the required tightening torque cannot be provided for the external thread bottle cap with the characteristics by the form of friction force between contact surfaces, and the automatic tightening solution is fresh, so that the flexible tightening head needs to be designed aiming at the external thread product with the characteristics to adapt to the automatic tightening of the product.
Disclosure of Invention
In view of the above analysis, the present invention is directed to a flexible tightening head and a tightening method thereof, which are used to solve the problem that the conventional tightening device cannot satisfy the tightening of the metal cap with external thread and the internal thread of the bottle body, which has large mass, poor elasticity and plasticity, small thread pitch and many turns.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the flexible tightening head comprises a mounting base body, a telescopic rod and a spring sleeved on the telescopic rod, wherein the mounting base body is provided with a reducing through hole used for the telescopic rod to move up and down, and the longitudinal section of the reducing through hole is convex; one end of the telescopic rod is coaxially provided with a working part matched with the slotted hole at the top of the bottle cap, and the other end of the telescopic rod is provided with a limiting part used for limiting the telescopic rod to slide downwards; the working part comprises an end head and a working cylinder, the diameter of the end head is smaller than or equal to the aperture of the slotted hole, and the diameter of the working cylinder is larger than the aperture of the slotted hole and smaller than or equal to the aperture of the lower part of the reducing through hole.
Furthermore, the number of the telescopic rods is at least two, and the telescopic rods are provided with the reducing through holes and the springs in corresponding numbers.
Further, the mounting base body is provided with a connecting part connected with the driving mechanism; the driving mechanism enables the mounting base body to have the freedom of translation along the vertical direction and rotation around the vertical direction.
Furthermore, the reducing through hole comprises a top hole and a bottom hole, and the free length of the spring is larger than or equal to the distance from the reducing position of the reducing through hole to the top end face of the working cylinder.
Further, the limiting part comprises a limiting hole and a limiting pin; or the limiting part is an integrally formed barrier bulge.
Further, the lower end face of the mounting base body is smoothly arranged; the top end of the end head is of a spherical structure.
Furthermore, the slotted hole is a cross-shaped groove, the end head is of a cross-shaped structure, and the surface of the cross-shaped structure is smooth.
Furthermore, the installation base member is the structure of falling U-shaped, and the reducing through-hole is located the structure both sides of falling U-shaped.
In another aspect, a tightening method based on the flexible tightening head is provided, which includes the following steps:
the method comprises the following steps: assembling a tightening head, and connecting the tightening head with a driving mechanism;
step two: moving the bottle cap to a position to be screwed, vertically feeding the driving mechanism downwards to a height L1, and inserting the end head of the telescopic rod into a slotted hole of the bottle cap;
step three: the tightening head continues to be fed vertically downwards by a height L2 by the driving mechanism so that the lower surface of the mounting base contacts the upper surface of the bottle cap and exerts a certain pressure on the bottle cap;
step four: the screwing head starts to rotate according to the screwing direction by the driving mechanism, the bottle cap is screwed gradually, the driving mechanism stops rotating and moves vertically upwards to the initial position after the bottle cap is screwed completely, and the work cycle is finished.
Further, in the second step, after the driving mechanism vertically feeds the bottle cap downwards to the height L1, the driving mechanism rotates for a circle in the direction opposite to the screwing direction, and the end of the telescopic rod is inserted into the slotted hole of the bottle cap.
Compared with the prior art, the invention has at least one of the following beneficial effects:
a) according to the flexible tightening head provided by the invention, the plurality of telescopic rods capable of stretching are arranged on the mounting base body, the working ends of the telescopic rods are matched with the slotted holes in the bottle cap, the mounting base body has the freedom degrees of translation along the vertical direction and rotation around the vertical direction by the driving mechanism, the metal external thread bottle cap with large mass, poor elastoplasticity (large rigidity), small thread pitch and multiple turns is tightened, the problem of small static friction moment of the traditional contact surface is solved, the tightening head is clamped into the slotted hole of the bottle cap to provide larger tightening torque, and the flexible tightening head can be widely applied to automatic tightening equipment of products of the type.
b) According to the flexible tightening head provided by the invention, the working part comprises the end head and the working cylinder, the diameter of the end head is smaller than or equal to the aperture of the slotted hole, the diameter of the working cylinder is larger than the aperture of the slotted hole and smaller than or equal to the aperture of the lower part of the reducing through hole, and the working cylinder arranged on the working part of the telescopic rod is in contact with the upper surface of the bottle cap in the working process of the tightening head, so that the stability of the bottle cap in the tightening process is greatly improved.
c) The flexible tightening head provided by the invention is simple in structure, the tightening head comprises the mounting base body, the telescopic rods and the springs, parts are easy to obtain or the manufacturing process is simple, the invention cost is obviously reduced, the adaptability to products is strong, the optimal number of the telescopic rods can be configured according to the requirements of the product structure so as to obtain the optimal stability in the tightening process, and the expansibility is strong.
d) According to the screwing method provided by the invention, the driving mechanism is downwards fed twice in the screwing process, firstly, the driving mechanism is vertically downwards fed by a height L1, the end of the telescopic rod is inserted into the slotted hole of the bottle cap, and secondly, the driving mechanism is vertically downwards fed by a height L2, so that the lower surface of the installation base body is contacted with the upper surface of the bottle cap and applies certain pressure to the bottle cap, the working cylinder of the working part is contacted with the upper surface of the bottle cap, the stability of the bottle cap in the screwing process is greatly improved, the whole screwing process is simple to operate, and the whole process automation is realized.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a schematic structural view of a flexible tightening head according to a first embodiment of the present invention;
fig. 2 is a disassembled view of the flexible tightening head according to the first embodiment of the present invention;
fig. 3 is a schematic view illustrating a working process of the flexible tightening head according to the first embodiment of the present invention.
Reference numerals:
1-bottle cap; 2, a telescopic rod; 3-a limit pin; 4-a spring; 5-mounting the substrate.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention discloses a flexible tightening head aiming at the condition that a metal external thread bottle cap with large mass, poor elastic-plastic property (large rigidity), small thread pitch and more turns is matched with an internal thread of a bottle body, as shown in figures 1 to 2, the flexible tightening head comprises an installation base body 5, a telescopic rod 2 and a spring 4 sleeved on the telescopic rod 2, wherein the installation base body 5 is provided with a reducing through hole used for the telescopic rod 2 to move up and down, and the longitudinal section of the reducing through hole is convex; one end of the telescopic rod 2 is coaxially provided with a working part matched with the slotted hole at the top of the bottle cap 1, and the other end of the telescopic rod 2 is provided with a limiting part for limiting the telescopic rod 2 to slide downwards; the working part comprises an end head and a working cylinder, the diameter of the end head is smaller than or equal to the aperture of the slotted hole, and the diameter of the working cylinder is larger than the aperture of the slotted hole and smaller than or equal to the aperture of the lower part of the reducing through hole. The mounting base 5 is provided with a connecting part connected with the driving mechanism; the driving mechanism is not limited in form, and the driving mechanism allows the mounting base 5 to have the freedom of translation in the vertical direction and rotation around the vertical direction.
In this embodiment, the number of the reducing through holes is at least one, and the telescopic rods 2 and the springs 4 are matched in corresponding numbers. Preferably, the number of the reducing through holes is even, and the reducing through holes are uniformly and symmetrically arranged on the mounting base body 5. When the number of the telescopic rods 2 is one, the slotted holes of the bottle caps 1 are cross grooves, the ends of the telescopic rods 2 are of cross structures, and the cross grooves are matched with the cross structures to screw the bottle caps 1. When the quantity of telescopic link 2 is a plurality of, the quantity of telescopic link 2 and the slotted hole quantity that sets up on the bottle lid 1 are to corresponding, and the slotted hole can also be the cross for smooth arc wall, and is corresponding, and smooth arc wall corresponds the end of arc structure, and the cross corresponds the end of cross structure. The tightening head with the structure realizes the tightening of the round bottle cap, solves the problem of small static friction moment of the traditional contact surface, is clamped into the groove hole of the bottle cap 1 through the tightening head to provide larger tightening torque, and can be widely applied to automatic tightening equipment of products of the type. When the bottle cap is used, the optimal number of the telescopic rods is configured according to the requirement of a product structure, namely the number of the slotted holes formed in the bottle cap 1, so that the optimal stability in the screwing process is obtained, and the expansibility is strong.
In order to prevent the end head of the telescopic rod 2 from scratching the upper surface of the bottle cap 1, when the end head is of an arc-shaped structure, the top end of the end head is preferably of a spherical structure; when the end is in a cross structure, the surface of the cross structure is smooth. The lower end face of the mounting base body 5 is smoothly arranged, and the lower end face of the mounting base body 5 has higher flatness, so that the upper surface of the bottle cap 1 is effectively prevented from being scratched. Preferably, the contact portion of the tightening head with the bottle cap 1 is provided with a coating of polyurethane material, and the tightening head provided with the coating of polyurethane material can effectively prevent the surface of the bottle cap 1 from being scratched.
In this embodiment, the reducing through-hole includes apical pore and bottom outlet, and the working cylinder side of telescopic link 2 becomes clearance fit with the bottom outlet of installation base member 5, and telescopic link 2 stretches out from the opposite side of installation base member 5. One side of the telescopic rod 2 extending out of the mounting base body 5 is provided with a limiting part for limiting the telescopic rod 2 to slide downwards, preferably, the limiting part comprises a limiting hole and a limiting pin, and the limiting pin 3 is in interference fit with a pin hole at the non-working end of the telescopic rod 2; or, the limiting part is a baffle protrusion which is integrally formed, and the baffle protrusion can limit the telescopic rod 2 to completely slide downwards.
In this embodiment, the telescopic rod 2 is disposed in the diameter-variable hole, the spring 4 is sleeved on the telescopic rod 2, the purpose of setting the spring is to move the bottle cap 1 to a position to be screwed, the driving mechanism vertically feeds the height L1 downward, after the end of the telescopic rod 2 extends into the slotted hole on the bottle cap 1, the driving mechanism further vertically feeds the height L2 downward, so that the lower surface of the mounting base 5 contacts with the upper surface of the bottle cap 1, the spring 4 is in a compressed state at this time, the elastic force of the spring 4 restoring to the original state acts on the working cylinder, and further a certain pressure is applied to the bottle cap 1, it is ensured that the screwing head is in the working process, the working cylinder disposed on the working part of the telescopic rod 2 contacts with the upper surface of the bottle cap 1, the working part of the telescopic rod 2 is tightly matched with the bottle cap, the dislocation is prevented, the bottle. Meanwhile, after the screwing-up is completed, the driving mechanism stops rotating and vertically moves upwards to the initial position, and the working part of the telescopic rod 2 is ejected out to the bottom hole of the reducing hole due to the restoring force of the spring 4, namely, the end head of the telescopic rod 2 is smoothly and automatically ejected out due to the existence of the spring 4, so that the telescopic rod is not required to be manually pulled out, the working efficiency is improved, and the automation degree is improved.
Considering that the spring 4 needs to provide elastic force during the process of screwing the bottle cap, the length of the spring 4 needs to meet certain conditions, the length of the spring 4 only needs to ensure that the spring 4 can apply certain elastic force to the working part after the working part of the telescopic rod 2 completely extends into the bottom hole, preferably, the free length of the spring 4 is greater than or equal to the distance from the reducing part of the reducing through hole to the top end face of the working cylinder, namely, when the flexible tightening head is installed and is in a vertical state, the spring 4 is in a natural or compressed state, and part of the working part is located in the bottom hole of the reducing through hole.
In order to make the rotation of the tightening head more flexible, the mounting base 5 is configured to be a hollow structure, preferably, the mounting base 5 is configured to be an inverted U-shaped structure, the reducing through holes are formed in two sides of the inverted U-shaped structure, and the mounting base 5 is configured to be the inverted U-shaped structure, so that the material usage is reduced, the weight of the mounting base 5 is reduced, and the movement flexibility of the driving mechanism is improved.
Based on the tightening method of the flexible tightening head in the present embodiment, the tightening process is as shown in fig. 3, and the tightening method specifically includes the following steps:
the method comprises the following steps: assembling the tightening head and connecting the tightening head with the driving mechanism. According to the slotted hole quantity and the shape of waiting to screw up 1 top setting of bottle lid, select the telescopic link 2 of assorted quantity and shape end, the spring 4 of assorted quantity and suitable length, after the installation is accomplished to flexible tightening head, when tightening head is in vertical state, spring 4 is in nature or compression state, and the work portion part this moment is located the bottom hole of reducing through-hole, the spring 4 of this length can guarantee to provide elasticity for the work portion of telescopic link 2, when can also avoiding telescopic link 2 rebound the work cylinder of work portion to block, whole working process's smoothness has been guaranteed, the stability of work has been promoted.
Step two: the bottle cap 1 is moved to a position to be screwed, and the end head of the telescopic rod 2 is inserted into the slotted hole of the bottle cap 1. Specifically, the bottle cap 1 is moved to the position to be screwed by the robot, and when the bottle cap 1 reaches the position to be screwed, the screw head is initially in the state shown in fig. 3(a), and is fed vertically downward by a height L1 by the driving mechanism, and then rotated by one rotation in the direction opposite to the screwing direction, so that the tip of the telescopic rod 2 is inserted into the slot on the upper surface of the bottle cap 1.
Step three: the tightening head continues to be fed vertically downward by the driving mechanism by a height L2 as shown in fig. 3(b) so that the lower surface of the mounting base 5 comes into contact with the upper surface of the bottle cap 1 and exerts a certain pressure on the bottle cap 1.
Step four: the screwing head is rotated by the driving mechanism in the screwing direction to screw the closure 1 in step by step, as shown in fig. 3(c), until the complete screwing, the driving mechanism is stopped and moved vertically upwards to the initial position, from which a working cycle is ended.
Compared with the prior art, the flexible tightening head that this embodiment provided, to the quality big, the elastoplasticity is poor (the rigidity is big), the pitch is little, the many metal external screw thread bottle lid of number of turns and the many circumstances of bottle internal thread matched with, through set up a plurality of telescopic links 2 that can stretch out and draw back on installation base member 5, the slotted hole cooperation on the working end of telescopic link 2 and the bottle lid 1, actuating mechanism makes installation base member 5 have along vertical direction translation and around vertical direction pivoted degree of freedom, realized screwing up circular bottle lid, the little problem of traditional contact surface static friction moment has been solved, go into the bottle lid slotted hole through tightening head card in order to provide bigger tightening torque, with the automatic equipment of screwing up of wide application in this type of product. In addition, the tightening head is in the working process, the working cylinder arranged on the working part of the telescopic rod 2 is in surface contact with the upper surface of the bottle cap 1, and the stability of the bottle cap 1 in the tightening process is greatly improved. In addition, the flexible tightening head provided by the invention has the advantages of simple structure, easiness in obtaining parts or simple manufacturing process, remarkably reduced cost, strong adaptability to products, capability of configuring the optimal number of telescopic rods according to the requirements of the product structure so as to obtain the optimal stability in the tightening process and strong expansibility.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. The flexible tightening head is characterized by comprising an installation base body (5), a telescopic rod (2) and a spring (4) sleeved on the telescopic rod (2), wherein the installation base body (5) is provided with a reducing through hole used for the telescopic rod (2) to move up and down, and the longitudinal section of the reducing through hole is convex;
one end of the telescopic rod (2) is coaxially provided with a working part matched with a slotted hole at the top of the bottle cap (1), and the other end of the telescopic rod is provided with a limiting part for limiting the downward sliding of the telescopic rod (2);
the working part comprises an end head and a working cylinder, the diameter of the end head is smaller than or equal to the aperture of the slotted hole, and the diameter of the working cylinder is larger than the aperture of the slotted hole and smaller than or equal to the aperture of the lower part of the reducing through hole;
the number of the telescopic rods (2) is at least two, and the telescopic rods are matched with the reducing through holes and the springs (4) in corresponding numbers;
the mounting base body (5) is provided with a connecting part connected with the driving mechanism;
the driving mechanism enables the mounting base body (5) to have the freedom of translation along the vertical direction and rotation around the vertical direction;
the mounting base body (5) is of an inverted U-shaped structure, and the reducing through holes are formed in two sides of the inverted U-shaped structure;
the reducing through-hole includes apical pore and bottom outlet, the working cylinder side of telescopic link (2) with the bottom outlet of installation base member (5) becomes clearance fit, telescopic link (2) are followed the opposite side of installation base member (5) stretches out, telescopic link (2) stretch out one side of installation base member (5) is equipped with the injectment the spacing portion of telescopic link (2) landing downwards, spacing portion includes spacing hole and spacer pin (3), spacer pin (3) with the pinhole of telescopic link (2) non-work end becomes interference fit.
2. The flexible tightening head according to claim 1, wherein the free length of the spring (4) is equal to or greater than the distance from the diameter of the diameter-variable through hole to the top end surface of the working cylinder.
3. The flexible tightening head according to claim 1, wherein the stopper portion includes a stopper hole and a stopper pin;
or the limiting part is a baffle boss which is integrally formed.
4. The flexible tightening head according to claim 1, characterized in that the lower end face of the mounting base (5) is smooth;
the top end of the end head is of a spherical structure.
5. The flexible tightening head according to claim 1, wherein the slot is a cross-shaped slot, and the head is a cross-shaped structure having a smooth surface.
6. A tightening method of a flexible tightening head according to any one of claims 1 to 5, characterized by comprising the steps of:
the method comprises the following steps: assembling a tightening head, and connecting the tightening head with a driving mechanism;
step two: moving the bottle cap (1) to a position to be screwed, vertically feeding the driving mechanism downwards to a height L1, and inserting the end of the telescopic rod (2) into a slotted hole of the bottle cap (1);
step three: the tightening head is continuously fed downwards by a height L2 vertically by the driving mechanism, so that the lower surface of the mounting base body (5) is contacted with the upper surface of the bottle cap (1) and applies certain pressure to the bottle cap (1);
step four: the screwing head starts to rotate according to the screwing direction by the driving mechanism, the bottle cap (1) is screwed gradually until the bottle cap is screwed completely, the driving mechanism stops rotating and vertically moves upwards to the initial position, and the work cycle is finished.
7. The tightening method according to claim 6, characterized in that in the second step, after the driving mechanism is vertically fed downwards to a height L1, the end of the telescopic rod (2) is inserted into the slotted hole of the bottle cap (1) by rotating for one circle in the direction opposite to the tightening direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910351245.1A CN109928345B (en) | 2019-04-28 | 2019-04-28 | Flexible tightening head and tightening method |
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| CN201910351245.1A CN109928345B (en) | 2019-04-28 | 2019-04-28 | Flexible tightening head and tightening method |
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| CN109928345A CN109928345A (en) | 2019-06-25 |
| CN109928345B true CN109928345B (en) | 2021-02-26 |
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| CN115556984B (en) * | 2022-10-24 | 2023-05-16 | 山东颐工材料科技股份有限公司 | A kind of ASA high rubber powder packaging equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2848816Y (en) * | 2005-10-29 | 2006-12-20 | 钟国良 | Opener of wine bottle cover |
| CN202038848U (en) * | 2010-10-11 | 2011-11-16 | 中国石油化工股份有限公司 | Linear multi-head cap screwing device |
| CN203653202U (en) * | 2013-09-10 | 2014-06-18 | 北京航天斯达新技术装备公司 | Cover screwing system for external-thread plastic barrel cover |
| CN203993055U (en) * | 2014-06-10 | 2014-12-10 | 广州明珞汽车装备有限公司 | A kind of high-speed flexible twin shaft tightening machine |
| CN108381158B (en) * | 2018-04-20 | 2019-11-05 | 上海帝升实业有限公司 | A kind of nonstandard screw-driving robot |
| CN207986630U (en) * | 2018-06-28 | 2018-10-19 | 陕西匠诚工业控制系统有限公司 | A kind of drum AutoCappingmachine |
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