Stretcher for in-situ high-temperature polyimide stretching

Abstract

The utility model discloses a stretcher for in-situ high-temperature polyimide stretching, and belongs to stretchers. The problems that an existing stretcher cannot achieve one-way stretching and two-way stretching and can not achieve two-way synchronous stretching are solved. The device comprises a lower optical flat plate and two stretching units, wherein the two stretching units are vertically arranged on the lower optical flat plate in an up-and-down crossed manner; each stretching unit comprises a transmission table, a linear driver and two clamping dies; the transmission table is fixedly connected with the lower optical flat plate; the fixed end of the linear driver is connected to the transmission table, the driving end of the linear driver extends towards one side and is connected with one clamping die, the other clamping die is arranged on the transmission table and keeps fixed, and the two clamping dies are oppositely arranged. The four clamping dies in the two stretching units are located on the same layer. The device is mainly used for the tensile test of the polyimide film.

Description

Technical Field

[0001] The utility model belongs to a stretching machine, in particular to a stretching machine used for in-situ high-temperature polyimide stretching. Background Art

[0002] With the continuous development of the dielectric field, polyimide, a polymer with a thermal imide ring, has become the focus of research. In the past decade, research articles on polyimide in the dielectric field have shown a blowout growth. At present, a variety of monomers and a variety of polymerization methods have been developed, and the performance of these new polyimide materials far exceeds that of commercial dielectric polymers. Recently, Chinese Patent Publication No. CN116353036A discloses a thermal polyimide film stretching machine shaping device, which includes a stretching machine oven, a sprocket device and a heating device. However, the design is mainly aimed at the development of large-scale test devices for polyimide in the industrial field. Although it is relatively mature, it is costly and the dosage of drugs is not accurately controlled. This makes it impossible to carry out extensive scientific research in the laboratory. Therefore, in response to the above problems, a stretching machine for laboratory scientific research can be further developed. Starting from unidirectional and biaxial stretching, the research uses metal preparation to design a stretching machine that can be used for in-situ high-temperature polyimide stretching. This invention is expected to provide an experimental device for laboratory experiments in the basic field of scientific research to understand the effects of stretching on the mechanical and electrical properties of polyimide, and promote the further development of the polyimide industry process. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a stretching machine for in-situ high-temperature polyimide stretching; through the design of two stretching units, both unidirectional stretching test and bidirectional stretching test can be realized, and synchronous stretching of bidirectional stretching can be realized through a right-angle drive.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A stretching machine for in-situ high-temperature polyimide stretching, comprising a lower optical plate and two stretching units, wherein the two stretching units are vertically arranged on the lower optical plate in an intersecting manner and are used for unidirectional or bidirectional stretching of polyimide film; each stretching unit comprises a transmission platform, a linear drive and two clamping dies; the transmission platform is fixedly connected to the lower optical plate; the fixed end of the linear drive is connected to the transmission platform, the driving end of the linear drive extends to one side and is connected to one of the clamping dies, the other clamping die is arranged on the transmission platform and remains fixed, and the two clamping dies are arranged opposite to each other; the four clamping dies in the two stretching units are on the same level.

[0006] Furthermore, the linear drive includes a screw shaft, two guide rails, two sliders, a screw nut and a support seat, the support seat is fixedly mounted on the lower optical plate and arranged opposite to the transmission platform; one end of the screw shaft is rotatably connected to the transmission platform, the other end of the screw shaft is rotatably connected to the support seat, and the screw nut is threaded on the screw shaft; the two guide rails are arranged side by side on both sides of the screw shaft, one end of the guide rails is fixedly connected to the transmission platform, and the other end is fixedly connected to the support seat, each guide rail is slidably connected to a slider, and the lower surface of the clamping mold installed at the driving end of the linear drive is fixedly connected to the two sliders and the screw nut.

[0007] Furthermore, the clamping mold includes an upper mold, a lower mold and a winding core. The lower surface of the upper mold has a groove 1 along its length direction, and the upper surface of the lower mold has a groove 2 along its length direction. After the upper mold and the lower mold are closed, groove 1 and groove 2 are assembled into a cavity with openings at both ends. The winding core is inserted into the cavity, and the end of the polyimide film is rolled on the winding core and fixed under the extrusion of the upper mold and the lower mold.

[0008] Furthermore, the cross section of the winding core is a triangle, and the cross section of the cavity after the upper mold and the lower mold are combined is also a triangle.

[0009] Furthermore, the stretching machine also includes a right-angle drive, which is fixedly mounted on the lower optical plate and connects the two screw shafts together for synchronous driving of the two screw shafts.

[0010] Furthermore, the right-angle drive comprises a slide bar, a sleeve, two groups of worm gear assemblies and two groups of universal rocker assemblies. The slide bar is fixedly mounted on the lower optical plate and is located between the power input ends of the two screw shafts. The sleeve is sleeved on the slide bar and moves up and down. The two groups of worm gear assemblies are arranged vertically and are respectively arranged corresponding to a screw shaft. One end of each group of worm gear assemblies is mounted on the sleeve through a group of universal rocker assemblies, and the other end is mounted on the power input end of the corresponding screw shaft.

[0011] Each worm gear assembly includes a worm, a worm wheel and a support frame. The support frame is installed on the lower optical plate and sleeved on the screw shaft. The worm wheel is sleeved on the power input end of the screw shaft and is located in the support frame. The gear end of the worm is located in the support frame and is rotatably connected to the support frame; the gear of the worm is engaged with the worm wheel; and the optical axis end of the worm is fixedly connected to the universal rocker assembly.

[0012] Furthermore, the universal rocker assembly includes a fixed sleeve, a connecting rod one, a connecting rod two, a sliding sleeve, a connecting rod three and a connecting rod four; one end of the fixed sleeve is connected to one end of the connecting rod one and is vertically arranged with the connecting rod one, the other end of the connecting rod one is fixedly connected to one end of the connecting rod two and is vertically arranged with the connecting rod two, the sliding sleeve is sleeved on the connecting rod two and slides relatively; one end of the connecting rod three is fixedly installed on the sliding sleeve, the other end of the connecting rod three is connected to one end of the connecting rod four, and the other end of the connecting rod four is fixedly connected to the sleeve; the optical axis end of the worm is inserted into the fixed sleeve.

[0013] Furthermore, the universal rocker assembly includes a rocker, a joint bearing, an insertion rod and a sliding sleeve. The optical axis end of the worm is fixedly connected to one end of the rocker, the other end of the rocker is connected to the outer spherical surface of the joint bearing, the inner spherical surface of the joint bearing is connected to one end of the insertion rod, and the other end of the insertion rod is inserted into the sliding sleeve from one end port of the sliding sleeve and slides relative to the sliding sleeve. The other end port of the sliding sleeve is fixedly connected to the outer side wall of the sleeve.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The present application sets up two sets of linear drives and two pairs of clamping dies. You can choose to use one set of linear drives to drive one pair of clamping dies for unidirectional stretching, or you can choose to use two sets of linear drives to synchronously drive two pairs of clamping dies to achieve bidirectional stretching in the vertical direction.

[0016] 2. Since the stretching of polyimide film generally requires heating by a heating device, and the heating temperature can reach 300°C, this application uses a high-temperature resistant screw pair as a linear drive to ensure the service life of the stretching machine and the reliability of the polyimide film stretching test results.

[0017] 3. The present application opens grooves on the upper mold and the lower mold to form an insertion cavity, and rolls the end of the polyimide film onto a winding core, which is inserted into the cavity after the clamping mold is closed and remains fixed. Therefore, the end of the polyimide film will not separate from the upper mold and the lower mold due to stretching, thereby ensuring the accuracy of the tensile test results and the stability of the clamping of the polyimide film and the clamping mold during the stretching process.

[0018] 4. The present application connects two screw shafts together through the design of a right-angle drive. When one of the screw shafts rotates, the rotational motion can be transmitted to the other screw shaft through the right-angle drive, thereby realizing the synchronous movement of the two screw shafts. In the process of bidirectional driving of the polyimide film, synchronous stretching of the bidirectional drive can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] As a part of this application, the accompanying drawings are used to provide a further understanding of the present invention.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is a schematic diagram of the structure of the clamping mold.

[0022] Figure 3 Schematic diagram of the structure of two clamping molds clamping a polyimide film.

[0023] Figure 4 It is a schematic diagram of the structure of the right-angle drive and the screw shaft assembly.

[0024] Figure 5 A schematic diagram of one structural form of a right-angle drive.

[0025] Figure 6 A schematic diagram of another structural form of a right-angle drive.

[0026] Explanation of the reference numerals: 1-lower optical plate; 2-transmission platform; 3-linear drive; 3-1-screw shaft; 3-2-guide rail; 3-3-slider; 3-4-screw nut; 3-5-support seat; 4-clamping mold; 4-1-upper mold; 4-1-1-groove one; 4-2-lower mold; 4-2-1-groove two; 4-3-winding core; 5-right-angle drive; 5-1-slide rod; 5-2-sleeve; 5-3-worm; 5-4-worm wheel; 5-5-support frame; 5-6-fixed sleeve; 5-7-connecting rod one; 5-8-connecting rod two; 5-9-sliding sleeve; 5-10-connecting rod three; 5-11-connecting rod four; 5-12-rocker; 5-13-spherical bearing; 5-14-insertion rod; 5-15-sliding sleeve two; 6-polyimide film. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0028] See also Figures 1 to 6The embodiment of the present application provides a stretching machine for in-situ high-temperature polyimide stretching, which includes a lower optical plate 1 and two stretching units, the two stretching units are vertically arranged on the lower optical plate 1 in an upper and lower cross manner, and are used for unidirectional or bidirectional stretching of a polyimide film 6; each stretching unit includes a transmission platform 2, a linear drive 3 and two clamping molds 4; the transmission platform 2 is fixedly connected to the lower optical plate 1 by screws; the fixed end of the linear drive 3 is connected to the transmission platform 2 to achieve the fixation and transmission of the linear drive 3, the driving end of the linear drive 3 extends to one side and is connected to one of the clamping molds 4, the other clamping mold 4 is arranged on the transmission platform 2 and remains fixed, the two clamping molds 4 are arranged oppositely, and clamp the opposite ends of the polyimide film 6, the four clamping molds 4 in the two stretching units are on the same level, and the polyimide film 6 is stretched under the drive of the two linear drives 3.

[0029] In order to achieve the uniaxial stretching and biaxial stretching of the polyimide film 6, as Figure 1 As shown, in this embodiment, two groups of linear drivers 3 and two pairs of clamping molds 4 are provided. One of the groups of linear drivers 3 can be selected to drive one of the pairs of clamping molds 4 for unidirectional stretching, or two groups of linear drivers 3 can be selected to synchronously drive the two pairs of clamping molds 4 to achieve bidirectional stretching in the vertical direction. In this embodiment, the transmission platform 2 is a rectangular block structure with a supporting function. Two vertically arranged transmission platforms 2 are arranged on the lower optical plate 1, so that the two groups of linear drivers 3 installed on the transmission platform 2 are also arranged vertically. In order to avoid mutual interference between the two groups of linear drivers 3 during the driving process, the two groups of linear drivers 3 are arranged crosswise up and down and parallel to the lower optical plate 1. At the same time, the four clamping molds 4 enclose a square frame, and the four sides of the polyimide film 6 are clamped in the four clamping molds 4 to achieve the common clamping of the four sides of the polyimide film 6, thereby achieving bidirectional stretching; the bidirectional stretching in this embodiment refers to the stretching in the x-axis direction and the stretching in the y-axis direction, that is, the stretching in two vertical directions, not the stretching in the same direction to both sides, thereby achieving the comprehensive stretching of the polyimide film 6.

[0030] In this embodiment, the lower optical plate 1 is provided with a series of holes, through which it is connected to a laboratory desktop or workbench, and to the transmission platform 2, to ensure stability during the experiment. The four top corners of the lower optical plate 1 are chamfered, and the upper and lower surfaces of the lower optical plate 1 are arranged in parallel to ensure the stability of the structure.

[0031] See also Figure 1The linear drive 3 adopts a screw pair, specifically, it includes a screw shaft 3-1, two guide rails 3-2, two sliders 3-3, a screw nut 3-4 and a support seat 3-5, the support seat 3-5 is fixedly mounted on the lower optical plate 1 by screws, and is arranged opposite to the transmission platform 2; one end of the screw shaft 3-1 is rotatably connected to the transmission platform 2 through a bearing, and the other end of the screw shaft 3-1 is rotatably connected to the support seat 3-5 through a bearing, and the screw nut 3-4 is screwed on the screw shaft 3-1; the two guide rails 3-2 are arranged side by side on both sides of the screw shaft 3-1, one end of the guide rail 3-2 is fixedly connected to the transmission platform 2, and the other end is fixedly connected to the support seat 3-5, and a slider 3-3 is slidably connected to each guide rail 3-2, and the lower surface of the clamping mold 4 installed at the driving end of the linear drive 3 is fixedly connected to the two sliders 3-3 and the screw nut 3-4.

[0032] Since the stretching of polyimide film generally requires heating by a heating device, and the heating temperature can reach 300°C, this embodiment uses a high-temperature resistant lead screw pair as a linear drive to ensure the service life of the stretching machine and the reliability of the polyimide film stretching test results. At the same time, in order to ensure that the four clamping molds 4 are on the same level, the four sliders 3-3 in the two stretching units of this embodiment have the same height. In addition, since the two sliders 3-3 and the screw nut 3-4 in this embodiment are fixedly connected to the lower surface of the clamping mold 4, the screw nut 3-4 can make a linear motion along the screw shaft 3-1 with the cooperation of the clamping mold 4, the slider 3-3 and the guide rail 3-2, forming the driving end of the linear drive 3, that is, the experimenter screws the knob at the power input end of the screw shaft 3-1 (the knob is a threaded knob to facilitate the rotation operation when wearing heat-insulating gloves in a high temperature environment), the screw shaft 3-1 rotates, and drives the screw nut 3-4 to move along the axial direction of the screw shaft 3-1, and the screw nut 3-4 drives the clamping mold 4 to move. Since one end of the polyimide film 6 is clamped on the clamping mold 4 installed on the transmission platform 2, and the other end is installed on the movable clamping mold 4, the polyimide film 6 is stretched during the movement of the clamping mold 4.

[0033] See also Figure 2 and Figure 3 The clamping mold 4 includes an upper mold 4-1, a lower mold 4-2 and a winding core 4-3. The lower surface of the upper mold 4-1 is provided with a groove 4-1-1 along its length direction, and the upper surface of the lower mold 4-2 is provided with a groove 4-2-1 along its length direction. The groove 4-1-1 and the groove 4-2-1 are arranged opposite to each other up and down. After the upper mold 4-1 and the lower mold 4-2 are connected and molded by bolts, the groove 4-1-1 and the groove 4-2-1 are assembled into a cavity with openings at both ends. The winding core 4-3 is inserted into the cavity and fixed under the extrusion of the upper mold 4-1 and the lower mold 4-2.

[0034] In order to ensure the stability of the clamping of the polyimide film 6 and the clamping mold 4 during the stretching process, grooves are opened on the upper mold 4-1 and the lower mold 4-2 to form an insertion cavity, and the end of the polyimide film 6 is rolled on the winding core 4-3. The winding core 4-3 is inserted into the cavity after the clamping mold 4 is closed and remains fixed. Therefore, the end of the polyimide film 6 will not separate from the upper mold 4-1 and the lower mold 4-2 due to stretching, thereby ensuring the accuracy of the tensile test results.

[0035] Preferably, in order to further ensure the stability of the polyimide film 6 and the clamping mold 4 during the stretching process, the cross-section of the core 4-3 is triangular, and the cross-section of the cavity after the upper mold 4-1 and the lower mold 4-2 are combined is also triangular, so that the core 4-3 is fixed.

[0036] See also Figure 4 , Figure 5 and Figure 6 , the stretching machine also includes a right-angle drive 5, which is fixedly mounted on the lower optical plate 1 and is used for synchronously driving the two screw shafts 3-1; the right-angle drive 5 includes a slide bar 5-1, a sleeve 5-2, two groups of worm gear assemblies and two groups of universal rocker assemblies, the slide bar 5-1 is fixedly mounted on the lower optical plate 1 and is located between the power input ends of the two screw shafts 3-1, the sleeve 5-2 is sleeved on the slide bar 5-1 and can move up and down; the two groups of worm gear assemblies are arranged vertically and are respectively arranged corresponding to a screw shaft 3-1, one end of each group of worm gear assemblies is mounted on the sleeve 5-2 through a group of universal rocker assemblies, and the other end is mounted on the power input end of the corresponding screw shaft 3-1;

[0037] Each worm gear assembly includes a worm 5-3, a worm wheel 5-4 and a support frame 5-5. The support frame 5-5 is installed on the lower optical plate 1 and is sleeved on the screw shaft 3-1. The worm wheel 5-4 is sleeved on the power input end of the screw shaft 3-1 and is located in the support frame 5-5. The gear end of the worm 5-3 is located in the support frame 5-5 and is rotatably connected to the support frame 5-5; the gear of the worm 5-3 is engaged with the worm wheel 5-4 to realize power output; the optical axis end of the worm 5-3 is fixedly connected to the universal rocker assembly.

[0038] In the process of bidirectional driving of the polyimide film 6, in order to realize synchronous stretching of bidirectional driving, the present embodiment adopts a right-angle driver 5 to realize it, and the two screw shafts 3-1 are connected together by the right-angle driver 5. When one of the screw shafts 3-1 rotates, the rotational motion can be transmitted to the other screw shaft 3-1 by the right-angle driver 5, so as to realize synchronous motion of the two screw shafts 3-1. At the same time, the present embodiment adopts the assembly of the worm gear assembly, the universal rocker assembly, the slide bar 5-1 and the sleeve 5-2 to realize the change of motion direction.

[0039] Since the two screw shafts 3-1 are connected through a right-angle drive 5, when one of the screw shafts 3-1 rotates, the other screw shaft 3-1 must also rotate. In order to achieve unidirectional stretching of the polyimide film 6, it is possible to choose to clamp and stretch only through one pair of clamping molds 4.

[0040] Preferably, the universal rocker assembly includes a fixed sleeve 5-6, a connecting rod 5-7, a connecting rod 5-8, a sliding sleeve 5-9, a connecting rod 3 5-10 and a connecting rod 4 5-11; one end of the fixed sleeve 5-6 is connected to one end of the connecting rod 5-7 and is vertically arranged with the connecting rod 5-7, the other end of the connecting rod 5-7 is fixedly connected to one end of the connecting rod 2 5-8 and is vertically arranged with the connecting rod 2 5-8, the sliding sleeve 5-9 is sleeved on the connecting rod 2 5-8 and slides relatively; one end of the connecting rod 3 5-10 is fixedly installed on the sliding sleeve 5-9, the other end of the connecting rod 3 5-10 is connected to one end of the connecting rod 4 5-11, and the other end of the connecting rod 4 5-11 is fixedly connected to the sleeve 5-2; the optical axis end of the worm 5-3 is inserted into the fixed sleeve 5-6.

[0041] In order to realize the transmission of power, the present embodiment adopts a universal rocker assembly. When one of the lead screw shafts 3-1 rotates, the lead screw shaft 3-1 drives the worm wheel 5-4 thereon to rotate, the worm wheel 5-4 drives the worm 5-3 engaged therewith to rotate, the worm 5-3 drives the connecting rod 1 5-7 and the connecting rod 2 5-8 to rotate around the central axis of the worm 5-3, the connecting rod 2 5-8 drives the sliding sleeve 5-9 to rotate around the central axis of the worm 5-3, and at the same time the sliding sleeve 5-9 slides on the connecting rod 2 5-8. The cylinder 5-9 drives the connecting rod three 5-10 and the connecting rod four 5-11 to rotate, and the connecting rod four 5-11 drives the sleeve 5-2 to rotate, and at the same time drives the sleeve 5-2 to move up and down along the central axis direction of the slide bar 5-1; the sleeve 5-2 then transmits the torque to another set of universal rocker assemblies, and the other set of universal rocker assemblies transmits the rotating torque to the worm 5-3 in another set of worm gear assemblies, and the worm 5-3 transmits the torque to the other screw shaft 3-1 through the worm gear 5-4, thereby realizing the synchronous rotation of the two screw shafts 3-1.

[0042] Among them, the universal rocker assembly in this embodiment can also be replaced by a combination of a rocker 5-12, a joint bearing 5-13, a plug rod 5-14 and a sliding sleeve 5-15, that is, the optical axis end of the worm 5-3 is fixedly connected to one end of the rocker 5-12, the other end of the rocker 5-12 is connected to the outer spherical surface of the joint bearing 5-13, the inner spherical surface of the joint bearing 5-13 is connected to one end of the plug rod 5-14, and the other end of the plug rod 5-14 is inserted into the sliding sleeve from one end port of the sliding sleeve 5-15 and slides relative to the sliding sleeve 5-15; the other end port of the sliding sleeve is fixedly connected to the outer side wall of the sleeve 5-2; when one of the lead screw shafts 3-1 rotates, the lead screw shaft 3-1 drives the worm wheel 5-4 thereon to rotate, and the worm wheel 5-4 The worm 5-3 engaged with it is driven to rotate, and the worm 5-3 drives the rocker 5-12 and the spherical bearing 5-13 to rotate around the central axis of the worm 5-3. The spherical bearing 5-13 drives the plug rod 5-14 to rotate, and the plug rod 5-14 drives the sleeve 5-2 to rotate, and at the same time drives the sleeve 5-2 to move up and down along the central axis of the slide bar 5-1. The torque transmission from the screw shaft 3-1 to the sleeve 5-2 is realized through this connection method; then the sleeve 5-2 transmits the torque to another set of universal rocker assemblies, and the other set of universal rocker assemblies transmits the rotating torque to the worm 5-3 in another set of worm gear assemblies, and the worm 5-3 transmits the torque to the other screw shaft 3-1 through the worm wheel 5-4, thereby realizing the synchronous rotation of the two screw shafts 3-1.

[0043] The working process of the utility model is further described below to further demonstrate the working principle and advantages of the utility model:

[0044] Uniaxial stretching: The two opposite sides of the polyimide film 6 are clamped on the two clamping molds 4 in one of the stretching units. The experimenter screws the knob at the power input end of the screw shaft 3-1 to rotate the screw shaft 3-1 and drive the screw nut 3-4 to move along the axial direction of the screw shaft 3-1. The screw nut 3-4 drives the clamping mold 4 to move. During the movement of the clamping mold 4, the uniaxial stretching of the polyimide film 6 is achieved.

[0045] Bidirectional synchronous stretching: The four sides of the polyimide film 6 are clamped on four clamping molds 4. The experimenter rotates the knob at the power input end of the screw shaft 3-1, and the screw shaft 3-1 rotates, and drives the screw nut 3-4 thereon to move along the axial direction of the screw shaft 3-1. The screw nut 3-4 drives the clamping mold 4 to move. In the process of the movement of the clamping mold 4, one side of the polyimide film 6 is stretched; at the same time, the screw shaft 3-1 rotates, and the screw shaft 3-1 drives the worm gear 5-4 thereon to rotate, and the worm gear 5-4 drives the worm 5-3 engaged with it to rotate, and the worm 5-3 drives the connecting rod 1 5-7 and the connecting rod 2 5-8 to rotate around the central axis of the worm 5-3, and the connecting rod 2 5-8 drives the sliding sleeve 5-9 to rotate around the central axis of the worm 5-3, and at the same time the sliding sleeve 5-9 slides on the connecting rod 2 5-8, and the sliding sleeve 5-9 drives the connecting rod 3 5-10 and the connecting rod 4 5-11 to rotate, and the connecting rod 4 5-11 drives the sleeve 5-2 to rotate, and at the same time drives the sleeve 5-2 to move up and down along the central axis of the sliding rod 5-1; the sleeve 5-2 then transmits the torque to another set of universal rocker assemblies, and the other set of universal rocker assemblies transmits the rotating torque to the worm 5-3 in another set of worm gear assemblies, and the worm 5-3 transmits the torque to the other screw shaft 3-1 through the worm gear 5-4, so as to realize the synchronous rotation of the two screw shafts 3-1; the other screw shaft 3-1 rotates, and drives the clamping mold 4 in the other stretching unit to move, so as to realize the stretching of the other side of the polyimide film 6, and then realize the bidirectional stretching of the polyimide film 6 in the vertical direction.

[0046] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A stretching machine for in-situ high-temperature polyimide stretching, characterized in that: The invention comprises a lower optical plate (1) and two stretching units, wherein the two stretching units are vertically arranged on the lower optical plate (1) in an intersecting manner and are used for uniaxial or biaxial stretching of a polyimide film (6); each stretching unit comprises a transmission platform (2), a linear drive (3) and two clamping dies (4); the transmission platform (2) is fixedly connected to the lower optical plate (1); the fixed end of the linear drive (3) is connected to the transmission platform (2), the driving end of the linear drive (3) extends to one side and is connected to one of the clamping dies (4), the other clamping dies (4) is arranged on the transmission platform (2) and remains fixed, and the two clamping dies (4) are arranged opposite to each other; the four clamping dies (4) in the two stretching units are on the same level.

2. A stretching machine for in-situ high-temperature polyimide stretching according to claim 1, characterized in that: The linear drive (3) comprises a screw shaft (3-1), two guide rails (3-2), two sliders (3-3), a screw nut (3-4) and a support seat (3-5); the support seat (3-5) is fixedly mounted on the lower optical plate (1) and arranged opposite to the transmission platform (2); one end of the screw shaft (3-1) is rotatably connected to the transmission platform (2), the other end of the screw shaft (3-1) is rotatably connected to the support seat (3-5), and the screw nut (3-4) is screwed on the screw shaft (3-1); the two guide rails (3-2) are arranged side by side on both sides of the screw shaft (3-1), one end of the guide rail (3-2) is fixedly connected to the transmission platform (2), and the other end is fixedly connected to the support seat (3-5), each guide rail (3-2) is slidably connected to a slider (3-3), and the lower surface of the clamping mold (4) installed at the driving end of the linear drive (3) is fixedly connected to the two sliders (3-3) and the screw nut (3-4).

3. A stretching machine for in-situ high-temperature polyimide stretching according to claim 1, characterized in that: The clamping mold (4) comprises an upper mold (4-1), a lower mold (4-2) and a winding core (4-3). The lower surface of the upper mold (4-1) is provided with a groove 1 (4-1-1) along its length direction, and the upper surface of the lower mold (4-2) is provided with a groove 2 (4-2-1) along its length direction. After the upper mold (4-1) and the lower mold (4-2) are closed, the groove 1 (4-1-1) and the groove 2 (4-2-1) are assembled into a cavity with two ends open. The winding core (4-3) is inserted into the cavity, and the end of the polyimide film (6) is rolled on the winding core (4-3) and fixed under the extrusion of the upper mold (4-1) and the lower mold (4-2).

4. A stretching machine for in-situ high-temperature polyimide stretching according to claim 3, characterized in that: The cross section of the winding core (4-3) is triangular, and the cross section of the cavity after the upper mold (4-1) and the lower mold (4-2) are molded together is also triangular.

5. A stretching machine for in-situ high-temperature polyimide stretching according to claim 2, characterized in that: The stretching machine also includes a right-angle drive (5), which is fixedly mounted on the lower optical plate (1) and connects the two screw shafts (3-1) together, and is used for synchronously driving the two screw shafts (3-1).

6. A stretching machine for in-situ high-temperature polyimide stretching according to claim 5, characterized in that: The right-angle drive (5) comprises a slide bar (5-1), a sleeve (5-2), two groups of worm gear assemblies and two groups of universal rocker assemblies. The slide bar (5-1) is fixedly mounted on the lower optical plate (1) and is located between the power input ends of the two screw shafts (3-1). The sleeve (5-2) is sleeved on the slide bar (5-1) and moves up and down. The two groups of worm gear assemblies are arranged vertically and are respectively arranged corresponding to a screw shaft (3-1). One end of each group of worm gear assemblies is mounted on the sleeve (5-2) through a group of universal rocker assemblies, and the other end is mounted on the power input end of the corresponding screw shaft (3-1). Each worm gear assembly comprises a worm (5-3), a worm wheel (5-4) and a support frame (5-5); the support frame (5-5) is mounted on the lower optical plate (1) and sleeved on the lead screw shaft (3-1); the worm wheel (5-4) is sleeved on the power input end of the lead screw shaft (3-1) and is located in the support frame (5-5); the gear end of the worm (5-3) is located in the support frame (5-5) and is rotatably connected to the support frame (5-5); the gear of the worm (5-3) is meshed with the worm wheel (5-4); and the optical axis end of the worm (5-3) is fixedly connected to the universal rocker assembly.

7. A stretching machine for in-situ high-temperature polyimide stretching according to claim 6, characterized in that: The universal rocker assembly comprises a fixed sleeve (5-6), a connecting rod 1 (5-7), a connecting rod 2 (5-8), a sliding sleeve (5-9), a connecting rod 3 (5-10) and a connecting rod 4 (5-11); one end of the fixed sleeve (5-6) is connected to one end of the connecting rod 1 (5-7) and is vertically arranged with the connecting rod 1 (5-7); the other end of the connecting rod 1 (5-7) is fixedly connected to one end of the connecting rod 2 (5-8) and is vertically arranged with the connecting rod 2 (5-11). 5-8) is vertically arranged, the sliding sleeve (5-9) is sleeved on the connecting rod two (5-8) and slides relatively; one end of the connecting rod three (5-10) is fixedly installed on the sliding sleeve (5-9), the other end of the connecting rod three (5-10) is connected to one end of the connecting rod four (5-11), and the other end of the connecting rod four (5-11) is fixedly connected to the sleeve (5-2); the optical axis end of the worm (5-3) is inserted into the fixed sleeve (5-6).

8. A stretching machine for in-situ high-temperature polyimide stretching according to claim 6, characterized in that: The universal rocker assembly comprises a rocker (5-12), a joint bearing (5-13), an insertion rod (5-14) and a second sliding sleeve (5-15); the optical axis end of the worm (5-3) is fixedly connected to one end of the rocker (5-12); the other end of the rocker (5-12) is connected to the outer spherical surface of the joint bearing (5-13); the inner spherical surface of the joint bearing (5-13) is connected to one end of the insertion rod (5-14); the other end of the insertion rod (5-14) is inserted into the sliding sleeve from one end port of the second sliding sleeve (5-15) and slides relative to the second sliding sleeve (5-15); the other end port of the sliding sleeve is fixedly connected to the outer side wall of the sleeve (5-2).

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