Static pressure box splicing structure, static pressure box and film stretching equipment

Abstract

The present invention provides a static pressure box splicing structure, a static pressure box and a film stretching device. During the mutual splicing process of a pair of box sections of the static pressure box splicing structure, a first splicing plate can be used to overlap the outer wall corresponding to the passive splicing box section, and a first splicing action is performed to enable the active splicing box section to be kept obliquely relative to the passive splicing box section. The active splicing box section is horizontally moved to make it closer to the passive splicing box section, so as to complete a second splicing action in which the at least one outer wall and the corresponding outer wall of the passive splicing box section approach each other until they contact, and the non-contact end of the active splicing box section is lifted up, so that the active splicing box section can pivot around the contact line between the at least one outer wall and the corresponding outer wall of the passive splicing box section when the end face structure of the first splicing plate and the passive splicing box section moves according to the design. After the structures of the active splicing box section and the passive splicing box section move relative to each other according to the design, a pair of box sections complete a third splicing action of splicing each other.

Description

Technical Field

[0001] The present application relates to the field of film material processing, and in particular to a static pressure box splicing structure, a static pressure box and a film stretching device. Background Art

[0002] Static pressure boxes are often used in film biaxial stretching equipment. The film is conveyed under the static pressure box, and the hot air flow or cold air flow generated in the fan room flows into the static pressure box through the air valve. After the hot air flow or cold air flow is combed by the air guide structure in the static pressure box, it flows out from the air outlet of the static pressure box and blows onto the surface of the film. The hot air flow causes the film to heat up, which is convenient for stretching and plastic deformation of the film, or the cold air flow causes the film to cool down, so that the film cools down and takes shape after stretching.

[0003] In order to meet the requirement of blowing air toward the surface of a wide film, the length of the static pressure box must at least cover the width of the film, which results in the static pressure box itself being relatively long and inconvenient to install and maintain. To solve this problem, two or more box sections are generally spliced ​​together to form a long static pressure box that can cover the width of the film. During the splicing process, the existing structure requires the adjacent active splicing box sections and passive splicing box sections to be aligned end to end along the axial direction (the length direction of the static pressure box) and spliced ​​close to each other. However, due to reasons such as processing accuracy, weight and length of the static pressure box sections, the wall connection is often inaccurate, and the splicing process needs to be repeated, which seriously affects work efficiency. In addition, since the corresponding wall panels of the two box sections of the existing splicing structure cannot provide mutual support, dislocation and vibration occur during use, affecting the use effect. Summary of the Invention

[0004] The present application provides a static pressure box splicing structure, a static pressure box and a film stretching device.

[0005] Specifically, this application is implemented through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a static pressure box splicing structure, comprising:

[0007] At least one pair of box segments, each box segment is formed with at least one open splicing end for splicing with the splicing end of another box segment;

[0008] The end surface structure of each box segment is provided with an outer wall and an inner wall, the outer wall is surrounded to form a cavity, and the inner wall is a surface to be spliced ​​arranged in the cavity;

[0009] One of the box sections serves as an active splicing box section, and the other box section serves as a passive splicing box section. A first splicing plate extending from the end of the at least one outer wall of the active splicing box section is provided, so that during the process of splicing a pair of box sections, the first splicing plate can be used to overlap the corresponding outer wall of the passive splicing box section, and a first splicing action is performed to enable the active splicing box section to be maintained obliquely relative to the passive splicing box section, and the active splicing box section is moved horizontally to make it closer to the passive splicing box section to complete a second splicing action in which the at least one outer wall and the corresponding outer wall of the passive splicing box section approach each other until they contact, and the non-contact end of the active splicing box section is lifted up so that the active splicing box section can pivot around the contact line between the at least one outer wall and the corresponding outer wall of the passive splicing box section when the end face structure of the first splicing plate and the passive splicing box section moves as designed. After the structures of the active splicing box section and the passive splicing box section move relative to each other as designed, the pair of box sections complete a third splicing action of splicing each other.

[0010] In some embodiments, a second splicing plate extending out from the end of the at least one inner wall is provided on at least one inner wall of at least one box segment, so as to be suitable for performing the first splicing action, the second splicing action and the third splicing action when the second splicing plate and the end face structure of the other box segment move as designed, and when a pair of box segments are completed in the state of mutual splicing, the part of the second splicing plate extending out from the end of the at least one inner wall overlaps the corresponding inner wall surface of the other box segment.

[0011] In some embodiments, multiple splicing plates located on the same outer wall or inner wall are arranged in an array along the extension direction of the contact line.

[0012] In some embodiments, the inner wall includes a form with fixed wall surfaces at both ends, and the inner wall of the passive splicing box segment corresponding to at least one inner wall of the active splicing box segment is also provided with a second splicing plate extending out of the corresponding inner wall of the passive splicing box segment, and the second splicing plates of a pair of box segments are arranged alternately between the two fixed wall surfaces of the inner wall.

[0013] In some embodiments, the inner wall includes a fixed wall surface at only one end, and at least a pair of second splicing plates are provided on the same inner wall. The pair of second splicing plates are respectively provided on both sides of the same inner wall to form a clamping structure.

[0014] In some embodiments, a plurality of first splicing plates are provided on the outer wall of the active splicing box segment. The plurality of first splicing plates of the active splicing box segment and the first splicing plates, second splicing plates and / or end face structures provided on the corresponding outer walls of the passive splicing box segment form staggered supports along the extension direction of the contact line.

[0015] In some embodiments, the extended portion of the second splicing plate is formed with a horizontal section and a bent section at a free end of the horizontal section, and the bending direction of the bent section is consistent with the direction of the second splicing plate approaching or moving away from the contact line relative to the inner wall.

[0016] In some embodiments, the free end of the second splicing plate is formed with a tip and sliding profiles on both sides for guiding the corresponding structure of another box section to slide into place.

[0017] In a second aspect, an embodiment of the present application provides a static pressure box, comprising:

[0018] The splicing structure described in the first aspect.

[0019] In a third aspect, an embodiment of the present application provides a film stretching device, comprising:

[0020] a fan chamber for generating airflow;

[0021] A conveying mechanism for conveying the film;

[0022] The static pressure box described in the first aspect is used to blow the airflow introduced from the fan chamber toward the surface of the film conveyed by the conveying mechanism.

[0023] According to various embodiments of the present invention, during the splicing process, the active splicing box segment performs a relative moving action, and the passive splicing box segment performs a relatively stationary action. By extending the first splicing plate provided on the outer wall of the active splicing box segment out of the end of the outer wall, the first splicing plate can be overlapped on the corresponding outer wall of the passive splicing box segment, so that when the first splicing action is performed, the active splicing box segment leans obliquely on the passive splicing box segment with the help of its own gravity; when the second splicing action is performed, it is only necessary to push and pull the active splicing box segment in the horizontal direction, so that the outer wall of the active splicing box segment can gradually approach the outer wall of the passive splicing box segment, and at the same time, under the guidance of the oblique edges on both sides of the front end of the first splicing plate, the two box segments are aligned in the horizontal direction, and since the outer walls of the two box segments are all height-aligned with the first splicing plate Directional positioning, so that the height direction of the outer walls of the splicing ends of the two box sections is completed. In the first splicing action and the second splicing action, the upper part (contact end) of the active splicing box section is abutted against the corresponding outer wall of the passive splicing box section by the first splicing plate, and the lower part (non-contact end) is supported on the ground or the mounting bracket by its own gravity, thereby saving the operator the effort of lifting the active splicing box section; when executing the third splicing action, due to the resisting effect of the first splicing plate, the outer wall of the active splicing box section provided with the first splicing plate and the corresponding outer wall of the passive splicing box section can maintain contact to form a contact line. The operator only needs to lift the non-contact end of the active splicing box section to pivot the active splicing box section around the contact line relative to the passive splicing box section and complete the splicing. In summary, since the overlap of the first splicing plate forms a support point, the entire splicing process saves the operator effort during pushing, pulling or lifting, and in the process of pushing and pulling the active box section and using the contact line as the central pivot splicing, it also avoids the complex process of repeated docking due to inaccurate positioning caused by factors such as processing accuracy and box section gravity.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] Figure 1 Schematic diagram of the splicing state of the static pressure box section in the first embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the static pressure box section in the first embodiment of the present invention;

[0028] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0029] Figure 4 is a schematic diagram of a cross section of a static pressure box section in the first embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of a first splicing action in the first embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of the second splicing action in the first embodiment of the present invention;

[0032] Figure 7 is a schematic diagram of the third splicing action in the first embodiment of the present invention;

[0033] Figure 8 is a schematic diagram of the principle of the first splicing action in the second embodiment of the present invention;

[0034] Figure 9 is a schematic diagram of the principle of the first splicing action in the third embodiment of the present invention;

[0035] Figure 10 is a schematic diagram of a static pressure box section in a fourth embodiment of the present invention;

[0036] Figure 11 is a schematic diagram of the overlapping state of the splicing plates in the first embodiment of the present invention;

[0037] Figure 12 2 is a schematic diagram of the principle of the first splicing action in the fifth embodiment of the present invention.

[0038] Reference numerals:

[0039] 10: Active splicing box section;

[0040] 20: Passive splicing box section;

[0041] 31: top wall; 32: bottom wall; 33: side wall; 331: side wall panel; 332: corner panel; 333: first bottom wall panel;

[0042] 41: horizontal wall; 411: first horizontal wall plate; 412: second horizontal wall plate; 42: first vertical wall plate; 421: first vertical wall plate; 422: second bottom wall plate; 423: bent plate; 43: second vertical wall; 431: second vertical wall plate; 44: bent plate;

[0043] 51: upper chamber; 52: lower chamber; 53: air outlet; 54: slit; 55: air outlet; 56: flow equalization chamber; 57: flow storage chamber. DETAILED DESCRIPTION

[0044] The present invention will now be discussed with reference to several embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0045] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "embodiment" and "one embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0046] The technical term "vertical wall" of the present invention refers to the first vertical wall 42, the second vertical wall 43 and the bend 44 appearing below; the technical term "first splicing plate" of the present invention refers to the first bottom wall plate 333 and the second bottom wall plate 422 appearing below; the technical term "second splicing plate" refers to the first horizontal wall plate 411, the second horizontal wall plate 412, the first vertical wall plate 421, the second vertical wall plate 431 and the bend 423 appearing below.

[0047] In the following description, some specific numerical values ​​or numerical ranges may be involved. It should be understood that these numerical values ​​and numerical ranges are merely exemplary, and they may be helpful in putting the idea of ​​the present invention into practice. However, the description of these examples is not intended to limit the scope of the present invention in any way. According to specific application scenarios and requirements, these numerical values ​​or numerical ranges can be set separately.

[0048] As mentioned above, the existing technology of axially aligning adjacent box sections and splicing them together is not easy to align quickly, which affects the splicing efficiency of the static pressure box, and the interface is loose and prone to vibration. The static pressure box splicing structure, static pressure box and film stretching equipment proposed in the embodiments of the present invention at least partially solve the above problems. Figures 1 to 12 The following describes the operating principle of the plenum tank splicing structure according to an exemplary embodiment of the present invention. Generally speaking, the plenum tank described herein is composed of two or more sections. The cross-sectional structures of the sections can be identical or different. Therefore, when the sections are spliced ​​together at their ends, the outer and inner walls of the sections must align and match to form a single, elongated plenum tank.

[0049] The following uses a specific static pressure box as an example to illustrate the concept of the embodiment of the present invention. Those skilled in the art will understand that the concept of the embodiment of the present invention can be applied to static pressure box products with any cross-sectional structure. Figure 1-4 As shown, the static pressure box of the embodiment of the present invention comprises at least an active splicing box section 10 and a passive splicing box section 20. Except for the first and last box sections in the axial direction (length direction) of the static pressure box, the other box sections have two open splicing ends.

[0050] In one embodiment, both the active and passive splicing box sections 10 and 20 are provided with an outer shell comprising an outer wall. The outer wall surrounds a chamber through which air flows. The inner wall divides the chamber into different smaller chambers, allowing air to circulate between the different smaller chambers, thereby adjusting the uniformity and velocity of airflow within the chamber. For example, the inner wall may comprise only transverse walls 41 extending horizontally, only vertical walls extending vertically, or a combination of any number of transverse walls 41 and vertical walls.

[0051] by Figure 1 As shown in the example, the outer wall includes a top wall 31, a bottom wall 32, and a pair of side walls 33, which are connected end to end and surround each other to form a chamber. Airflow passes through the chamber and is blown toward the film surface through an air outlet 53 provided in the bottom wall 32. The air outlet 53 extends along the length (axial direction) of the static pressure box and can be continuous or intermittent.

[0052] A transverse wall 41 is provided within the chamber, located between a pair of side walls 33, dividing the chamber into an upper chamber 51 and a lower chamber 52. Air flows through the upper chamber 51 and the lower chamber 52 sequentially, thereby improving the uniformity of the airflow. Transverse wall 41 includes an air vent 55, allowing air to flow from the upper chamber 51 to the lower chamber 52. In another example, the air vent 55 can be formed by the gap between the two sides of the transverse wall 41 and the side walls 33.

[0053] Specifically, a pair of first vertical walls 42 are provided on the bottom wall 32 of the lower cavity 52 on both sides of the air outlet 53, and a slit 54 is formed between the first vertical walls 42 to ensure that the direction of the airflow blowing out of the air outlet 53 is controllable and the airflow distribution along the axial direction is uniform.

[0054] In another example, second vertical walls 43 are further provided in the areas on both sides of the bottom wall 32 corresponding to the positions of the air outlets 55 , and a flow equalization cavity 56 is formed between the second vertical wall 43 and the side wall 33 for equalizing the airflow flowing down from the upper cavity 51 through the air outlet 55 .

[0055] Exemplarily, a pair of first vertical walls 42 are provided with folding plates 44 extending away from each other on the top. The first vertical walls 42 , the folding plates 44 and the second vertical walls 43 together form a flow storage cavity 57 for providing a pressure relief space for the airflow near the slit 54 .

[0056] Those skilled in the art will appreciate that the top wall 31, side walls 33, bottom wall 32, transverse wall 41, first vertical wall 42, and second vertical wall 43 at the spliced ​​ends of the box segments are all thin-walled structures, which can easily cause positional deviation due to insufficient processing precision, transportation, working conditions, etc. At the same time, due to the large length and mass of the box segments, it is difficult to accurately adjust the position during splicing. This makes it difficult to align the two box segments during the splicing process, resulting in an inefficient splicing process and the possibility of airflow vibration during use. To solve this problem, the embodiment of the present invention provides a "splicing plate" at the required position on at least one of the outer wall and the inner wall. The splicing plate "guides" the corresponding structures to quickly align and lock them together.

[0057] Specifically, such as Figure 5 As shown, first, a first splicing action is performed, and the passive splicing box segment 20 is placed horizontally on the mounting bracket (or only the mounting bracket is used to raise the splicing end), so that the splicing end of the passive splicing box segment 20 is maintained at a certain height, and then the active splicing box segment 10 is tilted at an angle, so that the first bottom wall plate 333 and the second bottom wall plate 422 of the active splicing box segment 10 are overlapped on the corresponding bottom wall 32 of the passive splicing box segment 20, thereby forming a support at the contact end f1 of the active splicing box segment 10, and forming a support at the non-contact end f2 of the active splicing box segment 10 and the ground or the mounting bracket, so that the active splicing box segment can be maintained in a tilted state.

[0058] like Figure 6 As shown, continue to perform the second splicing action, the operator only needs to follow Figure 6 Push or pull the active splicing box section 10 to the right, and the active splicing box section 10 rotates counterclockwise during the movement, and the bottom walls 32 of the active splicing box section 10 and the passive splicing box section 20 approach each other until a Figure 6 The abutment state shown in .

[0059] like Figure 7 As shown, to perform the third splicing action, the operator only needs to follow Figure 6 By lifting the bottom of the active splicing box section 10 upward, or pushing and pulling the upper area of ​​the right end of the active splicing box section 10 horizontally to the right, the active splicing box section 10 can be easily pivoted around the contact line o relative to the passive splicing box section 20, thereby completing the Figure 7 The splicing state is shown in .

[0060] During the entire splicing process, especially during the second and third splicing actions, the first bottom wall panel 333 and the second bottom wall panel 422 will move with the active splicing box section. Therefore, the length of the first bottom wall panel 333 and the second bottom wall panel 422 extending out of the active splicing box section 10 is designed so that they will not be squeezed and plastically deformed by the structure of the passive splicing box section 20 during the entire splicing process. This will be further explained later.

[0061] In one embodiment, the first bottom wall panel 333 or the second bottom wall panel 422 is arranged on the bottom wall 32 of the active splicing box segment 10, and can also be partially arranged on the bottom wall 32 of the passive splicing box segment 20. In this case, the protruding length of the first bottom wall panel 333 or the second bottom wall panel 422 arranged on the bottom wall 32 of the passive splicing box segment 20 should not be squeezed with the structure of the active splicing box segment 10 to produce plastic deformation.

[0062] In one embodiment, a first transverse wall panel 411 is further provided on the transverse wall 41 of the active splicing box segment 10, and a second transverse wall panel 412 is further provided on the transverse wall 41 of the passive splicing box segment 20. When the active splicing box segment 10 and the passive splicing box segment 20 are spliced ​​together, the first transverse wall panel 411 can overlap the transverse wall 41 of the passive splicing box segment 20, while the second transverse wall panel 412 can overlap the transverse wall 41 of the active splicing box segment 10, thereby locking the pair of transverse walls 41. In this case, during the splicing process, the first transverse wall panel 411 should be designed to not be squeezed and plastically deformed by the structure of the passive splicing box segment 20, and the second transverse wall panel 412 should be designed to not be squeezed and plastically deformed by the structure of the active splicing box segment 10.

[0063] Take the first transverse wall plate 411 as an example for explanation. Figure 8 The circular solid line represents the movement trajectory of the adjacent wall panel structure of the passive splicing box segment 20 corresponding to the first transverse wall panel 411 of the active splicing box segment 10 at the farthest end point. The circular shadow formed between the adjacent circular solid lines represents the allowable range of movement of the first transverse wall panel 411 of the upper active splicing box segment 10, that is, the protruding part of the first transverse wall panel 411 should be located in the corresponding circular shadow, which can ensure that it will not collide with the corresponding structure of the passive splicing box segment 20 during the pivoting process.

[0064] In another embodiment, Figure 9 The bending part of the first transverse wall panel 411 in the example can also appropriately extend the shadow of the ring. In this case, during the pivoting process, the first transverse wall panel 411 will squeeze the corresponding structure of the passive splicing box section 20. However, since the inner and outer walls and wall panels of the box section have a certain elastic deformation capacity, that is, a certain degree of squeezing will cause the contact position to elastically deform. After the pivoting splicing continues, the elastic deformation will be completely restored and will not affect the box section splicing action. At the same time, since a certain force needs to be applied to produce elastic deformation, this also improves the stability after the splicing is completed under certain conditions. Those skilled in the art will understand that only when the first transverse wall panel 411 extends too long from the shadow of the ring, so that it is sufficient to cause irreversible plastic deformation after colliding with the corresponding structure, will it affect the box section splicing action. Such a situation is not allowed.

[0065] In another embodiment, the extended length of the first transverse wall plate 411 includes a horizontal section and a bent section near the free end. The bent section is bent to facilitate the sliding of the wall surface during splicing and further absorb the error of the transverse wall 41 in the other box section. For example, Figure 7 As shown, in order to ensure that the first transverse wall plate 411 is pressed against the upper side of the transverse wall 41 of a pair of box sections at the same time, the bending section is formed to be bent upward. Figure 10 As shown, the first transverse wall plate 411 is entirely arranged on the lower side of the transverse wall 41 , and the bending section is arranged to bend downward, that is, bend toward the contact line o.

[0066] In another embodiment, a first vertical wall plate 421 and a second vertical wall plate 431 are provided on a pair of first vertical walls 42 and a pair of second vertical walls 43. As shown in the figure, the first vertical wall plate 421 is provided on the sides of the pair of first vertical walls 42 that are away from each other, and the second vertical wall plate 431 is provided on the sides of the pair of second vertical walls 43 that are close to each other. Since the processed vertical walls are cantilever structures and are more prone to deformation, such a symmetrically arranged structure can guide and absorb this undesirable deformation to the greatest extent, thereby increasing the upper limit of deformation that can be absorbed while ensuring the symmetry of the flow field.

[0067] In one embodiment, the free end of the second vertical wall plate 431 is formed with a tip on the trajectory annular surface, and the tip is formed by the intersection of a proximal inclined surface close to the contact line o and a distal inclined surface away from the contact line o, so as to be suitable for guiding the active splicing box segment 10 and the passive splicing box segment 20 to perform the third splicing action of pivoting around the contact line o and completing mutual splicing without squeezing and plastic deformation between the proximal inclined surface and the distal inclined surface and the outer wall and the inner wall.

[0068] In one embodiment, the splicing plate intersects the horizontal and vertical extensions to form a transition portion. For example, the airflow within the flow balancing chamber 56 is fast and has a strong flow field, making it more prone to leakage. Therefore, a bent plate structure consisting of sidewall panels 331, angle panels 332, and a first bottom wall panel 333 is provided in the flow balancing chamber 56 region to cooperate with the second vertical wall panel 431 to prevent leakage.

[0069] In one embodiment, both box sections can be provided with transverse wall panels. For example, the middle part of the transverse wall 41 of the passive splicing box section 20 is pre-connected with the second transverse wall panel 412. The first transverse wall panel 411 and the second transverse wall panel 412 are alternately arranged on the two sections of the box body and can basically cover the entire width. Each first transverse wall panel 411 and the second transverse wall panel 412 are arranged on the upper side of the transverse wall 41, or can be arranged on the lower side (that is, the first transverse wall panel 411 and the second transverse wall panel 412 are arranged on the same side of the transverse wall 41). Therefore, when the transverse wall 41 on either side is deformed by force, the first transverse wall panel 411 or the second transverse wall panel 412 can transfer the force to the transverse wall 41 on the other side to ensure stable splicing. In this case, if Figure 11 As shown in (a), the first transverse wall plate 411 and the second transverse wall plate 412 are respectively overlapped on the same side of the transverse wall 41, thereby "locking" the transverse walls 41. It should be noted that the number of spliced ​​plates should be adjusted according to factors such as the flow field intensity and the width of the wall to be spliced ​​to meet the support strength requirements.

[0070] In another embodiment, if Figure 11 As shown in (b), taking the second vertical wall 43 as an example, second vertical wall plates 431 can be symmetrically arranged on both sides of the second vertical wall 43 of one box section, so that a pair of second vertical wall plates 431 clamp the second vertical wall 43 corresponding to the other box section, avoiding the second vertical wall 43 from warping toward one side and reducing the impact on the smoothness of the airflow.

[0071] In one embodiment, the air flow velocity in the storage chamber 57 is slow and the static pressure is strong, and leakage is also prone to occur. Therefore, a bent plate structure consisting of a first vertical wall plate 421, a second bottom wall plate 422 and a bent plate 423 is set in the storage chamber 57 area to cooperate with the second vertical wall plate 412 to avoid leakage.

[0072] In another embodiment, the contact line o may also be formed by the sidewall, such as Figure 12 As shown, the active and passive splicing box sections 10 and 20 form a contact line o at the flange of the side wall 33, and are pivotally spliced ​​about the contact line o. In this case, the width dimension of the first transverse wall panel 411 is set so as not to interfere with each other during the pivoting process. For example, the width dimensions of the first transverse wall panel 411 and the second transverse wall panel 412 do not interfere with each other, or in the absence of the second transverse wall panel 412, the first transverse wall panel 411 and the side wall 33 do not interfere with each other in the width direction, thereby successfully completing the second pivoting splicing action.

[0073] In one embodiment, the splicing plate can be formed into a connecting portion and an overlapping portion. The wider connecting portion facilitates the connection strength with the inner and outer walls, while the slightly narrower overlapping portion facilitates the simultaneous formation of an upward or downward bend and a front bevel. This guides the horizontal and height alignment of the corresponding wall surfaces of the two box sections during the splicing process, and prevents the overlapping portion from interfering with the inner or outer wall of the other box section, making it difficult to splice. It should be noted that the front bend should be within the shadow of the ring to ensure that the splicing plate slides into the correct position during splicing, but it should not be too large to affect the flow field.

[0074] In one embodiment, when the two assembled box sections need to be disengaged, the third splicing action can be reversed, or the two sections can be directly dragged and pulled apart along the length direction of the static pressure box.

[0075] The film stretching equipment of an embodiment of the present invention includes a fan chamber, a conveying mechanism and a static pressure box, wherein the static pressure box adopts the aforementioned splicing structure to facilitate blowing the airflow introduced from the fan chamber to the surface of the film conveyed by the conveying mechanism. The fan chamber is used to generate airflow, and the conveying mechanism is used to convey the film.

[0076] The description of the embodiments herein and any references to directions and orientations are for ease of description only and are not to be construed as limiting the scope of the present invention. The following description of the preferred embodiments may involve combinations of features, which may exist independently or in combination. The present invention is not specifically limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A static pressure box splicing structure, characterized in that: include: At least one pair of box segments, each box segment is formed with at least one open splicing end for splicing with the splicing end of another box segment; The end surface structure of each box segment is provided with an outer wall and an inner wall, the outer wall is surrounded to form a cavity, and the inner wall is a surface to be spliced ​​arranged in the cavity; 18. The foldable container section of claim 17, wherein the at least one outer wall of the active container section is provided with a first splicing plate extending from an end portion of the at least one outer wall, so that the first splicing plate can be used to overlap the outer wall corresponding to the passive container section during the mutual splicing of the pair of container sections, and a first splicing action is performed to enable the active container section to be maintained obliquely relative to the passive container section, the active container section is horizontally moved closer to the passive container section, so as to complete a second splicing action in which the at least one outer wall and the corresponding outer wall of the passive container section are brought closer to each other until they contact, and the non-contact end of the active container section is lifted so that the active container section can pivot around the contact line between the at least one outer wall and the corresponding outer wall of the passive container section when the end face structure of the first splicing plate and the passive container section moves as designed. After the structures of the active container section and the passive container section move relative to each other as designed, the pair of container sections complete a third splicing action of being spliced ​​together. A second splicing plate extending from an end portion of the at least one inner wall of at least one box segment is provided on at least one inner wall, adapted to perform the first, second, and third splicing actions when the second splicing plate and the end surface structure of the other box segment move as designed, and when the pair of box segments are fully spliced ​​together, a portion of the second splicing plate extending from the end portion of the at least one inner wall overlaps a corresponding inner wall surface of the other box segment; The extended portion of the second splicing plate is formed with a horizontal section and a bent section at a free end of the horizontal section, and the bending direction of the bent section is consistent with the direction in which the second splicing plate approaches or moves away from the contact line relative to the inner wall.

2. The static pressure box splicing structure according to claim 1, characterized in that: The multiple splicing plates located on the same outer wall or inner wall are arranged in an array along the extension direction of the contact line.

3. The static pressure box splicing structure according to claim 1, characterized in that: The inner wall includes a form in which both ends are fixed wall surfaces, and the inner wall of the passive splicing box section corresponding to at least one inner wall of the active splicing box section is also provided with a second splicing plate extending out of the corresponding inner wall of the passive splicing box section, and the second splicing plates of a pair of box sections are arranged alternately between the two fixed wall surfaces of the inner wall.

4. The static pressure box splicing structure according to claim 1, characterized in that: The inner wall includes a fixed wall at only one end. At least a pair of second splicing plates are provided on the same inner wall. The pair of second splicing plates are respectively provided on both sides of the same inner wall to form a clamping structure.

5. The static pressure box splicing structure according to claim 1, characterized in that: A plurality of first splicing plates are provided on the outer wall of the active splicing box section. The plurality of first splicing plates of the active splicing box section and the first splicing plates, second splicing plates and / or end face structures provided on the corresponding outer walls of the passive splicing box section form staggered supports along the extension direction of the contact line.

6. The static pressure box splicing structure according to claim 1, characterized in that: The free end of the second splicing plate is formed with a tip and sliding profiles on both sides, which are used to guide the corresponding structure of the other box section to slide into place.

7. A static pressure box, characterized in that: It comprises the static pressure box splicing structure according to any one of claims 1 to 6.

8. A film stretching device, characterized in that: include: a fan chamber for generating airflow; A conveying mechanism for conveying the film; The static pressure box according to claim 7, wherein the static pressure box is used to blow the air flow introduced from the fan chamber toward the surface of the film conveyed by the conveying mechanism.

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