A film stretching clamp

Abstract

This utility model discloses a film stretching fixture. One side of the fixture body is a vertical side plate, and the other side consists of a top plate and a bottom plate extending laterally from the upper and lower ends of the side plate. A chain link shaft is provided between the top plate and the bottom plate on the side of the fixture body closest to the side plate. A top guide wheel, an outer upper guide wheel, and an inner upper guide wheel are provided on the top plate, and an outer lower guide wheel and an inner lower guide wheel are provided on the bottom plate. The top guide wheel, outer upper guide wheel, inner upper guide wheel, outer lower guide wheel, and inner lower guide wheel form a guide rail space that matches the cross-section of the guide rail. There is one top guide wheel centered, two outer upper guide wheels arranged side-by-side, one inner upper guide wheel centered, one outer lower guide wheel centered, and one inner lower guide wheel centered. This design ensures stable operation of the fixture along the guide rail while avoiding the problem of too many guide wheels, which is beneficial for weight reduction, cost reduction, and production time reduction.

Description

Technical Field

[0001] This utility model belongs to the technical field of film stretching equipment, and specifically relates to a film stretching fixture. Background Technology

[0002] In existing film stretching equipment (such as cross-stretchers), numerous clamps are distributed along a chain to fix the two edges of the film. As the chain moves, the clamps move along guide rails (also known as guide plates), and the film is conveyed accordingly. The distance between the guide rails on both sides of the film can be adjusted according to the process settings, so that the film is stretched and retracted under the fixation of the clamps. Some existing equipment has problems with unstable clamp movement, resulting in uneven and unsatisfactory stretching effects. Therefore, a sufficient number of guide and limiting structures are required. However, since cross-stretchers have hundreds or thousands of clamps on the chain, if the clamp parts are numerous and heavy, the overall cost and weight will increase significantly. Therefore, it is necessary to optimize and simplify the clamp structure. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a film stretching fixture, which solves the problems of instability or large number of parts and heavy weight of existing fixtures, and achieves a more streamlined structure while being stable and reliable, which helps to improve overall efficiency and economy.

[0004] According to the technical solution of this utility model, this utility model provides a film stretching fixture, including a fixture body, one side of which is a vertical side plate, and the other side of which is a top plate and a bottom plate extending laterally from the upper and lower ends of the side plate; a chain link shaft is provided between the top plate and the bottom plate on the side of the fixture body near the side plate; a top guide wheel, an outer upper guide wheel, and an inner upper guide wheel are provided on the top plate, and an outer lower guide wheel and an inner lower guide wheel are provided on the bottom plate; the top guide wheel, the outer upper guide wheel, the inner upper guide wheel, the outer lower guide wheel, and the inner... The lower side guide wheels form a guide rail space that matches the cross-section of the guide rail. The guide rail space is located on the side of the chain link shaft away from the side plate. The top guide wheel is located above the guide rail space. The outer upper guide wheel and the inner upper guide wheel are located on both sides of the upper end of the guide rail space, and the outer lower guide wheel and the inner lower guide wheel are located on both sides of the lower end of the guide rail space. The top guide wheel is a single wheel in the center, the outer upper guide wheels are two wheels arranged side by side, the inner upper guide wheel is a single wheel in the center, the outer lower guide wheel is a single wheel in the center, and the inner lower guide wheel is a single wheel in the center.

[0005] In some embodiments, a C-shaped enclosure is provided above the top plate. The enclosure has an upright plate on the side away from the side plate and an opening on the side facing the side plate. The other two sides of the enclosure are enclosure side walls. At the enclosure opening, a clamp is rotatably connected between the two enclosure side walls. The bottom of the clamp is a clamping head, and the upper surface of the top plate has a clamping surface corresponding to the clamping head.

[0006] In some embodiments, the rotation shaft of the top guide wheel protrudes from the side of the fence upright plate opposite to the fence opening to form a cantilever, and the top guide wheel is sleeved on the rotation shaft of the top guide wheel; the top plate has a clearance hole formed below the top guide wheel so that the top guide wheel protrudes below the top plate.

[0007] In some implementations, the rotation axis of the top guide wheel is horizontal, while the rotation axes of the outer upper guide wheel, inner upper guide wheel, outer lower guide wheel, and inner lower guide wheel are all vertical.

[0008] In some embodiments, the fixture body is formed by connecting an upper structural member and a lower structural member; the lower structural member forms the side plate and bottom plate of the fixture body, and the lower structural member also forms a transverse connecting plate located at the upper end of the side plate; the upper structural member forms the enclosure of the fixture body, and the upper structural member is connected to the connecting plate to jointly form the top plate of the fixture body.

[0009] In some implementations, the upper end of the link shaft is connected to the connecting plate, and the lower end of the link shaft is connected to the base plate. The lower structural member and the link shaft constitute the outer link of the chain.

[0010] In some implementations, two or more link shafts are provided on a lower structural member, with an intervening space between adjacent link shafts where no other components are present.

[0011] In some embodiments, the upper part of the clamp is a control handle, and the clamping head is an arc surface; the clamp is connected to the fence upright plate through an elastic reset member.

[0012] In some embodiments, the upper part of the clamp 6 is a control handle, and the upper end of the control handle is a ball head structure.

[0013] In some embodiments, a pivot hole is provided on the side wall of the enclosure, and a first pin hole is also provided on the pivot hole of at least one of the side walls of the enclosure. A clamping body pivot is rotatably connected to the middle of the clamping body, and a second pin hole is provided on the pivot. Both ends of the clamping body pivot are inserted into the pivot hole, and the first pin hole and the second pin hole are aligned and inserted into the positioning pin.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows: The film stretching fixture of this invention has corresponding guide wheels on both sides of the upper and lower ends of the guide rail and on the top surface of the upper end. A total of six guide wheels are arranged in a specific pattern, ensuring stable operation of the fixture along the guide rail and avoiding the problem of film stretching quality being affected by tilting or shaking during movement. It also avoids the problem of too many guide wheels, which is beneficial for weight reduction, cost reduction, and production time reduction. More preferably, the fixture of this invention directly forms the outer link of the chain, i.e., forms part of the chain. Therefore, there are no additional structural components for connecting and fixing with ordinary chains. Thus, there are no possible obstructions in the link portion, allowing the chain to cooperate more smoothly with the sprocket for transmission, further improving the stability of the fixture's movement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure provided by this utility model.

[0016] Figure 2 This is a top view structural diagram of the present invention.

[0017] Figure 3 This is a cross-sectional structural diagram of the fence uprights and top guide wheels provided by this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram from another angle provided by this utility model.

[0019] Figure 5 This is a three-dimensional structural diagram from another angle provided by this utility model.

[0020] Figure 6 This is a three-dimensional structural diagram from another angle provided by this utility model.

[0021] Figure 7 This is a partial cross-sectional view of the clamping body provided by this utility model with the clamping shaft removed.

[0022] Explanation of reference numerals in the attached figures: 1. Side plate; 2. Top plate; 3. Bottom plate; 4. Fence upright plate; 5. Fence side wall; 6. Clamp; 7. Chain link shaft; 8. Top guide wheel; 9. Outer upper guide wheel; 10. Inner upper guide wheel; 11. Outer lower guide wheel; 12. Inner lower guide wheel; 13. Guide rail space; 14. Elastic reset component; 15. First pin hole; 16. Clamp shaft. Detailed Implementation

[0023] This invention provides a film stretching fixture that solves the problems of instability or excessive parts and weight of existing fixtures. It achieves stability and reliability while simplifying the structure, which helps improve overall efficiency and economy.

[0024] Please see Figures 1 to 6 This utility model discloses a film stretching fixture, comprising a fixture body, a vertical side plate 1 on one side of the fixture body, and a top plate 2 and a bottom plate 3 extending laterally from the upper and lower ends of the side plate 1 on the other side of the fixture body, forming a C-shaped structure. A link shaft 7 is provided between the top plate 2 and the bottom plate 3 on the side of the fixture body near the side plate 1, and links can be fitted onto the link shaft 7 to form an integral chain structure.

[0025] A top guide wheel 8, an outer upper guide wheel 9, and an inner upper guide wheel 10 are provided on the top plate 2, and an outer lower guide wheel 11 and an inner lower guide wheel 12 are provided on the bottom plate 3. The top guide wheel 8, the outer upper guide wheel 9, the inner upper guide wheel 10, the outer lower guide wheel 11, and the inner lower guide wheel 12 form a guide rail space 13 that matches the cross-section of the guide rail. Figure 1 (As shown by the dashed line in the middle), the guide rail space 13 is located on the side of the chain link shaft 7 away from the side plate 1.

[0026] The top guide wheel 8 is located above the guide rail space 13. The entire film stretching fixture will be placed on the guide rail under the action of gravity, and the top guide wheel 8 will press against the upper surface of the guide rail, thus providing support, guidance, and reducing frictional resistance. The outer upper guide wheel 9 and the inner upper guide wheel 10 are located on both sides of the upper end of the guide rail space 13, respectively, and the outer lower guide wheel 11 and the inner lower guide wheel 12 are located on both sides of the lower end of the guide rail space 13, respectively. The outer upper guide wheel 9, the inner upper guide wheel 10, the outer lower guide wheel 11, and the inner lower guide wheel 12 will be in close contact with the side of the guide rail to provide limiting guidance and reduce frictional resistance on both the upper and lower ends.

[0027] The top guide wheel 8 is a single wheel positioned in the center, the outer upper guide wheels 9 are two wheels arranged side by side, the inner upper guide wheel 10 is a single wheel positioned in the center, the outer lower guide wheel 11 is a single wheel positioned in the center, and the inner lower guide wheel 12 is a single wheel positioned in the center. The two outer upper guide wheels 9 are arranged side by side, thus forming a further limit in the length direction of the guide rail, preventing the film stretching fixture from tilting. With a total of six guide wheels (the guide wheels are, for example, bearings), the number of guide wheels can be reduced while ensuring good guiding effect, resulting in lower cost and weight.

[0028] More specifically, a C-shaped enclosure is installed above the top plate 2. The side of the enclosure furthest from the side plate 1 is the enclosure stand 4, and the side facing the side plate 1 is the enclosure opening. The other two sides of the enclosure are enclosure side walls 5. At the enclosure opening, a clamping body 6 is rotatably connected between the two enclosure side walls 5. The bottom of the clamping body 6 is a clamping head, and the upper surface of the top plate 2 has a clamping surface corresponding to the clamping head. Its working principle is as follows: by controlling the rotation of the clamping body 6 with external force, a gap is created between the clamping head and the clamping surface at the bottom. After the edge of the film enters this gap, the clamping body 6 is rotated back to its original position, thus clamping and fixing the edge of the film between the clamping head and the clamping surface.

[0029] Furthermore, the rotation axis of the top guide wheel 8 is horizontal, while the rotation axes of the outer upper guide wheel 9, inner upper guide wheel 10, outer lower guide wheel 11, and inner lower guide wheel 12 are all vertical. The rotation axis of the top guide wheel 8 protrudes from the side of the enclosure upright plate 4 facing away from the enclosure opening, forming a cantilever. The top guide wheel 8 is sleeved on the rotation axis of the top guide wheel 8, and the top plate 2 has a clearance hole below the top guide wheel 8 to allow the top guide wheel 8 to protrude below the top plate 2. Furthermore, the enclosure upright plate 4 is parallel to the side plate 1, and the enclosure upright plate 4 and the remaining horizontal parts of the top plate 2 are connected by reinforcing ribs. This solution adopts a cantilevered rotation axis, which is structurally simple and can ensure structural stability. Especially when combined with other features of this utility model that can achieve simplification and weight reduction, its advantages are further highlighted.

[0030] Preferably, the fixture body is formed by connecting two parts: an upper structural member and a lower structural member. The lower structural member forms the side plate 1 and the bottom plate 3 of the fixture body, and also forms a transverse connecting plate located at the upper end of the side plate 1. The upper structural member forms the enclosure of the fixture body, and is connected to the connecting plate to form the top plate 2 of the fixture body. In existing fixture structures, the bottom plate 3 of the top plate 2 is generally fixed by a long bolt or pin. This large connecting member increases the weight of the fixture, and its location near the chain link shaft 7 can easily have an adverse effect on the chain drive; or, to ensure that the connecting member is far from the chain link shaft 7, the size of the fixture needs to be increased. In this solution, the lower structural member includes the side plate 1, the bottom plate 3, and a part of the top plate 2 (or the part used to connect to the top plate 2). The plate-like structure of the connecting plate can fit snugly to the top plate 2, ensuring a stable connection. During connection, the top plate 2 and the connecting plate are simply connected by bolts or welding.

[0031] Furthermore, the upper end of the link shaft 7 is connected to the connecting plate, and the lower end of the link shaft 7 is connected to the base plate 3. The lower structural component and the link shaft 7 constitute the outer link of the chain. As a supplementary explanation, the chain consists of an outer link and an inner link, with the outer link located outside the inner link. Existing fixtures are generally manufactured separately from the chain, or the fixture parts are fixed to a regular chain. In this solution, the lower structural component itself constitutes the outer link, which then combines with a regular or specially designed inner link to form a complete chain. This eliminates the need for an installation structure and avoids problems such as loosening between the fixture and the chain due to mechanical fit or precision errors.

[0032] Furthermore, two or more (including two) chain link shafts 7 are provided on a lower structural component, with no gaps between adjacent chain link shafts 7 and no other components. In other words, there are no aforementioned long bolts or pins or separate clamps and fasteners between the chain link shafts 7 and the ordinary chain. Therefore, the chain links on the chain link shafts 7 can better mate with the sprockets, and the dimensions of the clamp body (cross-sectional width dimension, for example...) Figure 1 The dimensions in the left and right directions can also be smaller, thereby reducing the material used and weight of the chain clamp.

[0033] Preferably, the upper part of the clamping body 6 is a control handle for easy control. The clamping head is arc-shaped to match the rotation method. The clamping body 6 is connected to the enclosure upright plate 4 through an elastic reset member 14, which facilitates the reset process and ensures the clamping effect. More preferably, the upper part of the clamping body 6 is a control handle, and the upper end of the control handle is a ball head structure. The spherical ball head structure is conducive to adapting to opening or closing the clamping wheels at different heights and angles, and can better realize the clamping and opening actions.

[0034] Preferably, please also refer to Figure 7 The side wall 5 of the enclosure has a pivot hole, and at least one of the pivot holes in the side wall 5 also has a first pin hole 15. A clamping shaft 16 is rotatably connected to the middle of the clamping body 6, and a second pin hole is provided on the shaft. Both ends of the clamping shaft 16 pass through the pivot hole, and the first pin hole 15 is aligned with the second pin hole and a positioning pin is inserted. This facilitates the installation of the structure and ensures that the shaft will not come off due to mechanical vibration after the chain has been running for a long time.

[0035] In summary, the film stretching fixture of this invention has corresponding guide wheels on both sides of the upper and lower ends of the guide rail and on the top surface of the upper end, and a total of six guide wheels in a specific arrangement, which ensures the stability of the fixture along the guide rail and avoids the problem of the film stretching quality being affected by the tilting or shaking of the fixture during movement. At the same time, it avoids the problem of too many guide wheels, which is conducive to the weight reduction of the fixture and the reduction of costs and production time. More preferably, the fixture of this invention directly forms the outer link of the chain, that is, forms part of the chain, so there are no additional structural components for connecting and fixing with ordinary chains. Therefore, there are no possible obstacles in the link part, which allows the chain to cooperate and transmit more smoothly with the sprocket, further improving the stability of the fixture movement.

Claims

1. A film stretching clamp characterized by, The fixture includes a main body, with a vertical side plate (1) on one side and a top plate (2) and a bottom plate (3) extending laterally from the upper and lower ends of the side plate (1) on the other side. A chain link shaft (7) is provided between the top plate (2) and the bottom plate (3) on the side of the fixture near the side plate (1). A top guide wheel (8), an outer upper guide wheel (9), and an inner upper guide wheel (10) are provided on the top plate (2), and an outer lower guide wheel (11) and an inner lower guide wheel (12) are provided on the bottom plate (3). The top guide wheel (8), the outer upper guide wheel (9), the inner upper guide wheel (10), the outer lower guide wheel (11), and the inner lower guide wheel (12) form a cross section with the guide rail. Matching guide rail space (13), guide rail space (13) is located on the side of the chain link shaft (7) away from the side plate (1); top guide wheel (8) is located above guide rail space (13), outer upper guide wheel (9) and inner upper guide wheel (10) are located on the upper side of guide rail space (13) respectively, outer lower guide wheel (11) and inner lower guide wheel (12) are located on the lower side of guide rail space (13) respectively; top guide wheel (8) is one set in the center, outer upper guide wheel (9) is two set in parallel, inner upper guide wheel (10) is one set in the center, outer lower guide wheel (11) is one set in the center, and inner lower guide wheel (12) is one set in the center.

2. The film stretching fixture according to claim 1, characterized in that, A C-shaped enclosure is provided above the top plate (2). The enclosure is a vertical plate (4) on the side away from the side plate (1), and an opening on the side facing the side plate (1). The other two sides of the enclosure are enclosure side walls (5). At the enclosure opening, a clamp (6) is rotatably connected between the two enclosure side walls (5). The bottom of the clamp (6) is a clamping head, and the upper surface of the top plate (2) has a clamping surface corresponding to the clamping head.

3. The film stretching fixture according to claim 2, characterized in that, The rotating shaft of the top guide wheel (8) protrudes from the side of the fence upright plate (4) facing away from the fence opening to form a cantilever, and the top guide wheel (8) is sleeved on the rotating shaft of the top guide wheel (8); the top plate (2) has a clearance hole below the top guide wheel (8) so that the top guide wheel (8) protrudes below the top plate (2).

4. The film stretching fixture according to claim 1, characterized in that, The rotation axis of the top guide wheel (8) is horizontal, while the rotation axes of the outer upper guide wheel (9), inner upper guide wheel (10), outer lower guide wheel (11), and inner lower guide wheel (12) are all vertical.

5. The film stretching fixture according to claim 1, characterized in that, The fixture body is formed by connecting the upper structural member and the lower structural member; the lower structural member forms the side plate (1) and bottom plate (3) of the fixture body, and the lower structural member also forms a transverse connecting plate, which is located at the upper end of the side plate (1); the upper structural member forms the enclosure of the fixture body, and the upper structural member is connected to the connecting plate to form the top plate (2) of the fixture body.

6. The film stretching fixture according to claim 5, characterized in that, The upper end of the link shaft (7) is connected to the connecting plate, and the lower end of the link shaft (7) is connected to the base plate (3). The lower structural component and the link shaft (7) constitute the outer link of the chain.

7. The film stretching fixture according to claim 6, characterized in that, Two or more link shafts (7) are provided on a lower structural member, and there is a gap space between adjacent link shafts (7) where no other components exist.

8. The film stretching fixture according to claim 2, characterized in that, The upper part of the clamp (6) is a control handle, and the clamping head is an arc surface; the clamp (6) is connected to the fence upright plate (4) through the elastic reset member (14).

9. The film stretching fixture according to claim 2, characterized in that, The upper part of the clamp (6) is a control handle, and the upper end of the control handle is a ball head structure.

10. The film stretching fixture according to claim 2, characterized in that, A pivot hole is provided on the side wall of the enclosure (5), and a first pin hole (15) is also provided on the pivot hole of at least one side wall of the enclosure (5). A clamping shaft (16) is rotatably connected to the middle of the clamping body (6), and a second pin hole is provided on the shaft. Both ends of the clamping shaft (16) are inserted into the pivot hole, and the first pin hole (15) is aligned with the second pin hole and a positioning pin is inserted.

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