A constant force clamping mechanism and a constant force clamping method

Abstract

The application discloses a constant elastic force clamping mechanism, which comprises a base, a left clamping piece, a right clamping piece, an elastic piece, a sliding block, a first magnet arranged in the sliding block and a second magnet arranged in the base, wherein the first magnet and the second magnet are oppositely arranged and spaced, the two opposite surfaces of the first magnet and the second magnet are parallel to each other, the included angles between the two surfaces and a horizontal plane are θ respectively, and the repulsion force between the first magnet and the second magnet is a clamping force F of the sliding block on a bottle mouth X =Fsinθ; the clamping force F of the sliding block on a bottle with a bottle mouth radius of a set value R1 1X =F1sinθ, wherein the clamping force F of the sliding block on a bottle with a bottle mouth radius of a set value R2 2X =F2sinθ, and F1=F2. The constant elastic force clamping mechanism and the constant elastic force clamping method can maintain a constant clamping force after replacement for two types of bottles with a determined bottle mouth radius, and the problems of bottle falling and bottle mouth scratching are avoided.

Description

Technical Field

[0001] This invention relates to the field of filling technology, and in particular to a constant elastic force clamping mechanism and a constant elastic force clamping method. Background Technology

[0002] When switching products in a blow-fill-swirl system, it is necessary to replace the bottle clamps that match the new product, ensuring that the center position of the clamps remains unchanged. Because the entire production line has numerous and complex bottle clamps, manual replacement and adjustment are time-consuming and labor-intensive, resulting in long downtime, reduced production efficiency, and inconvenience for customers.

[0003] In existing technologies, compatible bottle clamps are generally used to simultaneously meet the production needs of two or more bottle types. This structure has the following disadvantages:

[0004] If the compatible bottle clamp is set to the preset clamping force when the bottle opening is small, it will result in excessive clamping force when clamping a large bottle opening. This will not only easily scratch the bottle opening, but also increase the difficulty of transferring the bottle between different mechanisms.

[0005] If the compatible bottle clamp is set to the preset clamping force with the larger bottle opening, the clamping force will be too weak when clamping a smaller bottle opening, which may cause the bottle to fall. Summary of the Invention

[0006] The purpose of this invention is to provide a constant elastic force clamping mechanism and method, which can maintain a constant clamping force for two bottle types with a fixed bottle mouth radius after replacement, avoiding problems such as bottle falling and scratching the bottle mouth, thereby ensuring the production efficiency of the equipment.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A constant elastic force clamping mechanism includes a base, a pair of left and right shafts arranged at intervals along the left-right direction on the base, a pair of left and right clamping pieces rotatably disposed on the base about the center lines of the left and right shafts respectively, an elastic element with both ends connected to the rear ends of the left and right clamping pieces respectively, and a slider slidably disposed on the base and located between the left and right clamping pieces in the front-back direction. The front end of the slider is used to cooperate with the front ends of the left and right clamping pieces to clamp the bottle mouth, and the elastic element is used to provide an elastic restoring force to drive the left and right clamping pieces to rotate and reset.

[0009] The constant elastic force clamping mechanism further includes a first magnet disposed in the slider and a second magnet disposed in the base. The first magnet and the second magnet are arranged opposite each other at the same level and spaced apart. The two opposing surfaces of the first magnet and the second magnet are parallel to each other, and the angles between them and the horizontal plane are θ respectively. The repulsive force between the first magnet and the second magnet is... The clamping force F exerted by the slider on the bottle openingX =Fs inθ;

[0010] Where B is the magnetic field strength, S is the interaction area between the first magnet and the second magnet, μ0 is the vacuum permeability, and r is the distance between the first magnet and the second magnet;

[0011] The radii of the bottle openings being clamped are set values ​​R1 and R2, respectively:

[0012] The slider exerts a clamping force F on a bottle with a bottle opening radius of a set value R1. 1X =F1s inθ, where

[0013] The slider exerts a clamping force F on a bottle with a bottle opening radius of a set value R2. 2X =F2s inθ, where

[0014] Where F1 = F2.

[0015] Preferably, the constant elastic force clamping mechanism further includes a waist-shaped pad disposed above the base and for being passed through by the left and right axes, and the slider is disposed between the waist-shaped pad and the base.

[0016] More preferably, the constant elastic force clamping mechanism further includes a left sleeve and a right sleeve disposed on the base, the left sleeve and the right sleeve being respectively sleeved on the left shaft and the right shaft, the left clamping piece being disposed between the waist-shaped pad and the left sleeve, and the right clamping piece being disposed between the waist-shaped pad and the right sleeve.

[0017] More preferably, the constant elastic force clamping mechanism further includes a wear-resistant pad disposed below the waist-shaped pad, and the left clamping plate and the right clamping plate respectively abut against the wear-resistant pad through their upper surfaces.

[0018] Preferably, the base is provided with a guide groove for guiding the movement of the slider in the front-back direction.

[0019] Preferably, the first magnet is located at the rear end of the slider and is positioned in front of and above the second magnet.

[0020] Preferably, the rear end of the left clip protrudes to the right to form a left convex portion, and the rear end of the right clip protrudes to the left to form a right convex portion. The elastic element is a compression spring with its two ends respectively sleeved on the left convex portion and the right convex portion.

[0021] Preferably, the left and right shafts are cylindrical nuts, and the constant elastic force clamping mechanism further includes a bolt that passes upward through the base and is used to fix the cylindrical nuts.

[0022] Preferably, the centerlines of the left and right axes are parallel to each other and perpendicular to the sliding direction of the slider.

[0023] A constant elastic force clamping method is implemented through the aforementioned constant elastic force clamping mechanism. When changing the bottle, the displacement of the slider along the sliding direction is L = |R1-R2|. At this time, the magnetic field strength B and the included angle θ remain unchanged, while the effective area S and the distance r change simultaneously under the influence of the displacement L. The values ​​of the included angle θ, the effective area S, and the distance r are preset according to the set values ​​R1 and R2, respectively, so that the repulsive force F remains unchanged.

[0024] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The constant elastic force clamping mechanism and constant elastic force clamping method of the present invention, by setting a first magnet and a second magnet on the slider and the base respectively, the first magnet and the second magnet are arranged opposite each other at the same level and spaced apart, and the angle between the two and the horizontal plane is θ respectively. According to the preset values ​​R1 and R2, the values ​​of the angle θ, the effective area S and the distance r are preset respectively, so that when the radius of the bottle mouth switches between the preset values ​​R1 and R2, the repulsive force F can remain unchanged, thereby making the clamping force F of the slider acting on the bottle mouth constant. X The clamping force remains constant. For two bottle types with a fixed bottle neck radius, the clamping force can be maintained after replacement, avoiding problems such as bottle falling and scratching the bottle neck, thereby ensuring the production efficiency of the equipment. Attached Figure Description

[0025] Appendix Figure 1 This is a schematic diagram of the constant elastic force clamping mechanism according to a specific embodiment of the present invention;

[0026] Appendix Figure 2 This is a top view schematic diagram of the constant elastic force clamping mechanism according to a specific embodiment of the present invention;

[0027] Appendix Figure 3 This is a cross-sectional view of a constant elastic force clamping mechanism according to a specific embodiment of the present invention. Figure 1 (Hold the small bottle opening);

[0028] Appendix Figure 4 This is a cross-sectional view of a constant elastic force clamping mechanism according to a specific embodiment of the present invention. Figure 2 (Clamping the large bottle opening);

[0029] Appendix Figure 5 This is a schematic diagram showing the positional relationship between the first magnet and the second magnet when clamping the small bottle opening;

[0030] Appendix Figure 6 This is a schematic diagram showing the positional relationship between the first magnet and the second magnet when clamping the large bottle opening.

[0031] The components are: 1. base; 2. left shaft; 3. right shaft; 4. left clamp; 5. right clamp; 6. elastic element; 7. slider; 8. bottle mouth; 9. first magnet; 10. second magnet; 11. left sleeve; 12. waist-shaped gasket; 13. wear-resistant gasket. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0033] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0034] In the description of the embodiments of the present invention, it should be understood that the terms "length", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0037] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0039] See Figure 1-2 As shown, this embodiment provides a constant elastic force clamping mechanism, including a base 1, a pair of left shafts 2 and right shafts 3 arranged at intervals along the left-right direction on the base 1, a pair of left clamping pieces 4 and right clamping pieces 5 rotatably disposed on the base 1 about the axis of the left shafts 2 and 3 respectively, an elastic member 6 connected at both ends to the rear ends of the left clamping pieces 4 and right clamping pieces 5 respectively, and a clamping piece 6 rotatably disposed along the front-back direction (see reference). Figure 1 , Figure 1 The slider 7 (arrow pointing from back to front) is slidably mounted on the base 1 and located between the left clamp 4 and the right clamp 5. The front end of the slider 7 is used to engage with the front ends of the left clamp 4 and the right clamp 5 to clamp the bottle mouth 8. The elastic element 6 provides an elastic restoring force to drive the left clamp 4 and the right clamp 5 to rotate and reset. The centerlines of the left axis 2 and the right axis 3 are parallel to each other and perpendicular to the sliding direction of the slider 7.

[0040] See Figure 3-4 As shown, the aforementioned constant elastic force clamping mechanism further includes a first magnet 9 disposed in the slider 7 and a second magnet 10 disposed in the base 1. The first magnet 9 and the second magnet 10 are arranged opposite each other at the same level and spaced apart. The two opposing surfaces of the first magnet 9 and the second magnet 10 are parallel to each other, and the angles between them and the horizontal plane are θ respectively. The repulsive force between the first magnet 9 and the second magnet 10 Under the action of the repulsive force F, the clamping force F of the slider 7 on the bottle mouth 8 X=Fs inθ. In this embodiment, the first magnet 9 is located at the rear end of the slider 7 and is positioned in front of and above the second magnet 10; the base 1 is provided with a guide groove for guiding the movement of the slider 7 in the front-back direction.

[0041] Where B is the magnetic field strength, S is the interaction area between the first magnet 9 and the second magnet 10, μ0 is the free magnetic permeability, and r is the distance between the first magnet 9 and the second magnet 10.

[0042] In this embodiment, the radii of the bottle openings of the clamped bottles are set values ​​R1 and R2, respectively:

[0043] When the constant elastic force clamping mechanism is used to clamp a bottle with a bottle mouth radius of a set value R1, the clamping force F of the slider 7 on the bottle is... 1X =F1s inθ, where

[0044] When the constant elastic force clamping mechanism is used to clamp a bottle with a bottle mouth radius of a set value R2, the clamping force F of the slider 7 on the bottle is... 2X =F2s inθ, where

[0045] See Figure 5-6 As shown, since the difference in the bottle opening radius is a fixed value, when the first magnet 9 moves backward towards the second magnet 10, the magnetic field strength B remains unchanged, the vacuum permeability μ0 remains unchanged, the effective area S decreases, and the distance r decreases. A decrease in the effective area S leads to a decrease in the repulsive force F, while a decrease in the distance r leads to an increase in the repulsive force F. The magnitude of the change in the effective area S can be adjusted by changing the value of the included angle θ, so that the negative correlation between the effective area S and the repulsive force F cancels out the positive correlation between the distance r and the repulsive force F, thereby ensuring that the value of the repulsive force F remains constant, making F1 = F2, i.e., F... 1X =F 2X This allows for constant elastic force clamping of two different sized bottle openings 8.

[0046] Specifically, in Figure 5 In the diagram, the area (i.e., the effective area S) of the first magnet 9 and the second magnet 10 facing each other is equal to the area of ​​regions AB and CD, and the distance between them is r = MN; Figure 6 In the diagram, the area (i.e. the area of ​​action S) of the first magnet 9 and the second magnet 10 facing each other is the area of ​​the AF and ED regions, and the distance between them is r = AE = FD.

[0047] See Figure 1As shown, the constant elastic force clamping mechanism also includes a waist-shaped pad 12 disposed above the base 1 and through which the left shaft 2 and right shaft 3 pass, and a slider 7 disposed between the waist-shaped pad 12 and the base 1. The waist-shaped pad 12 is arranged in the left-right direction and spans above the slider 7. In this embodiment, the constant elastic force clamping mechanism also includes a wear-resistant pad 13 disposed below the waist-shaped pad 12, and the left clamping plate 4 and the right clamping plate 5 respectively abut against the wear-resistant pad 13 through their upper surfaces to reduce wear accordingly.

[0048] In this embodiment, the constant elastic force clamping mechanism also includes a left sleeve 11 and a right sleeve disposed on the base 1. The left sleeve 11 and the right sleeve are respectively sleeved on the left shaft 2 and the right shaft 3. The left clamping piece 4 is disposed between the lower surface of the wear-resistant pad 13 and the upper end surface of the left sleeve 11, and the right clamping piece 5 is disposed between the lower surface of the wear-resistant pad 13 and the upper end surface of the right sleeve.

[0049] See Figure 1 As shown, the rear end of the left clip 4 protrudes to the right to form a left convex part, and the rear end of the right clip 5 protrudes to the left to form a right convex part. The elastic element 6 is a compression spring with its two ends respectively sleeved on the left convex part and the right convex part.

[0050] In this embodiment, the left shaft 2 and the right shaft 3 are cylindrical nuts, the cap end of the cylindrical nut is located above the waist-shaped washer 12, and the body of the cylindrical nut is inserted downward into the base 1. The constant elastic force clamping mechanism also includes a bolt inserted upward into the base 1 for fixing the cylindrical nut. The bolt is used to fix the cylindrical nut on the base 1.

[0051] A constant elastic force clamping method is achieved through the aforementioned constant elastic force clamping mechanism:

[0052] When changing the bottle, the displacement of slider 7 along the sliding direction is L = |R1-R2|. At this time, the magnetic field strength B and the included angle θ remain unchanged, while the effective area S and the distance r change simultaneously under the influence of the displacement L. The values ​​of the included angle θ, effective area S, and distance r are preset according to the set values ​​R1 and R2, respectively, so that the negative correlation between the effective area S and the repulsive force F cancels out the positive correlation between the distance r and the repulsive force F, thereby ensuring that the value of the repulsive force F remains unchanged, that is, ensuring that F... 1X =F 2X This allows for constant elastic force clamping of two different sized bottle openings 8.

[0053] Obviously, for different combinations of values ​​for R1 and R2, the preset angle θ, the area of ​​action S, and the distance r are all different.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A constant elastic force clamping mechanism, characterized in that: The device includes a base, a pair of left and right shafts spaced apart on the base in a left-right direction, a pair of left and right clamping pieces rotatably disposed on the base about the center lines of the left and right shafts respectively, an elastic element with both ends connected to the rear ends of the left and right clamping pieces respectively, and a slider slidably disposed on the base and located between the left and right clamping pieces in a front-back direction. The front end of the slider is used to cooperate with the front ends of the left and right clamping pieces to clamp the bottle mouth, and the elastic element is used to provide an elastic restoring force to drive the left and right clamping pieces to rotate and reset. The constant elastic force clamping mechanism further includes a first magnet disposed in the slider and a second magnet disposed in the base. The first magnet and the second magnet are arranged opposite each other at the same level and spaced apart. The two opposing surfaces of the first magnet and the second magnet are parallel to each other, and the angles between them and the horizontal plane are θ respectively. The repulsive force between the first magnet and the second magnet is... The clamping force of the slider on the bottle opening ; Where B is the magnetic field strength, and S is the interaction area between the first magnet and the second magnet. Let r be the vacuum permeability, and r be the distance between the first magnet and the second magnet. The radii of the bottle openings being clamped are set values ​​R1 and R2, respectively: The clamping force of the slider on a bottle with a bottle opening radius of a set value R1 ,in ; The clamping force of the slider on a bottle with a bottle opening radius of a set value R2 ,in ; Where F1 = F2, and θ is an acute angle.

2. The constant elastic force clamping mechanism according to claim 1, characterized in that: The constant elastic force clamping mechanism also includes a waist-shaped pad disposed above the base and for being passed through by the left and right axes, and the slider is disposed between the waist-shaped pad and the base.

3. The constant elastic force clamping mechanism according to claim 2, characterized in that: The constant elastic force clamping mechanism further includes a left sleeve and a right sleeve disposed on the base. The left sleeve and the right sleeve are respectively sleeved on the left shaft and the right shaft. The left clamping piece is disposed between the waist-shaped pad and the left sleeve, and the right clamping piece is disposed between the waist-shaped pad and the right sleeve.

4. The constant elastic force clamping mechanism according to claim 2, characterized in that: The constant elastic force clamping mechanism also includes a wear-resistant pad located below the waist-shaped pad, and the left and right clamps respectively abut against the wear-resistant pad through their upper surfaces.

5. The constant elastic force clamping mechanism according to claim 1, characterized in that: The base is provided with a guide groove for guiding the movement of the slider in the front-back direction.

6. The constant elastic force clamping mechanism according to claim 1, characterized in that: The first magnet is located at the rear end of the slider and is positioned in front of and above the second magnet.

7. The constant elastic force clamping mechanism according to claim 1, characterized in that: The rear end of the left clip protrudes to the right to form a left convex portion, and the rear end of the right clip protrudes to the left to form a right convex portion. The elastic element is a compression spring with its two ends respectively sleeved on the left convex portion and the right convex portion.

8. The constant elastic force clamping mechanism according to claim 1, characterized in that: The left and right axes are respectively cylindrical nuts, and the constant elastic force clamping mechanism also includes a bolt that passes upward through the base and is used to fix the cylindrical nuts.

9. The constant elastic force clamping mechanism according to claim 1, characterized in that: The centerlines of the left and right axes are parallel to each other and perpendicular to the sliding direction of the slider.

10. A constant elastic force clamping method, implemented by any one of the constant elastic force clamping mechanisms according to claims 1-9, characterized in that: When the bottle is replaced, the slider is displaced along the sliding direction by L = |R1 - R2|. At this time, the magnetic field strength B and the included angle θ remain unchanged, while the effective area S and the distance r change simultaneously under the influence of the displacement L. The values ​​of the included angle θ, the effective area S and the distance r are preset according to the set values ​​R1 and R2 respectively, so that the repulsive force F remains unchanged.

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