Longitudinal film stretching device

Abstract

The utility model relates to the technical field of plastic film production and processing, in particular to a film longitudinal stretching device which comprises a supporting mechanism, a preheating roller set, a stretching roller set and a cooling roller set are arranged at the top of the supporting mechanism, a pressing assembly is connected to the supporting mechanism in a sliding mode, and a liquid inlet and outlet mechanism is arranged on one side of the supporting mechanism. The pressing assembly comprises a connecting rod, sliding blocks are fixedly connected to the two ends of the connecting rod, fixing bolts are arranged on the sides, away from the connecting rod, of the sliding blocks, a sliding rod is slidably connected to the connecting rod, and a connecting frame is fixedly connected to one end of the sliding rod. Compared with the prior art, the film longitudinal stretching device has the advantages that by arranging the pressing assembly, when the film longitudinal stretching device is used, the sliding block can slide according to the position of the tangent point of a polypropylene film and the stretching roller set, the position of the pressing roller can be adjusted, and the pressing roller can continuously press the position of the tangent point of the film and the stretching roller set; and the situation that the film slips is avoided, and the film stretching effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic film production and processing, in particular to a film longitudinal stretching device. Background Art

[0002] Biaxially oriented polypropylene film is generally a multi-layer co-extruded film, which is made by co-extruding polypropylene particles into sheets and then stretching them in both the longitudinal and transverse directions. The wide application of polypropylene film, low pollution and protection of forest natural resources make it a more popular packaging material than paper and polyvinyl chloride; the simple and reliable manufacturing process and reasonable price make it a more commonly used packaging material than biaxially oriented polyester film and biaxially oriented nylon film.

[0003] When producing and processing films, it is usually necessary to use a stretching machine to stretch the film transversely and longitudinally to make the film have a uniform thickness. When the film is stretched longitudinally, a longitudinal stretching device is required.

[0004] A polypropylene film longitudinal stretching device disclosed in Chinese patent CN208068865U includes: a heating roller group, a stretching roller group and a cooling roller group which are installed in sequence, the heating roller group includes at least two heating rollers with different temperatures, the heating roller includes a roller shell and an inner cylinder installed in the roller shell through a support frame, the inner cylinder does not rotate with the roller shell, and a heating oil chamber is formed between the inner cylinder and the roller shell and is filled with heat transfer oil.

[0005] However, compared with the prior art and the comparative scheme, it can be seen that the polypropylene film longitudinal stretching device still has the following problems during use:

[0006] In the existing longitudinal stretching device for polypropylene film, the position between the longitudinal stretching roller and the pressure roller is fixed during the longitudinal stretching process of the polypropylene film. When stretching polypropylene films of different specifications and thicknesses, the wrap angle between the film and the longitudinal stretching roller is also different, which will cause the pressure roller to not press on the tangent point between the film and the longitudinal stretching roller. As a result, during the stretching process of the film, the pressure roller cannot press the film tightly, causing the film to slip, affecting the stretching effect of the film.

[0007] Therefore, the present application proposes a film longitudinal stretching device to solve the above problems. Utility Model Content

[0008] The purpose of the present invention is to solve at least one of the above technical deficiencies.

[0009] The purpose of the utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background technology, and provide a film longitudinal stretching device.

[0010] The purpose of the utility model is achieved through the following technical solutions: a film longitudinal stretching device, comprising a support mechanism, a preheating roller group, a stretching roller group and a cooling roller group are respectively arranged on the top of the support mechanism, a pressing assembly is slidably connected to the support mechanism, and a liquid inlet and outlet mechanism is arranged on one side of the support mechanism;

[0011] The clamping assembly includes a connecting rod, both ends of the connecting rod are fixedly connected with sliders, a fixing bolt is provided on the side of the slider away from the connecting rod, a sliding rod is slidably connected to the connecting rod, one end of the sliding rod is fixedly connected to a connecting frame, an elastic part is provided between the connecting frame and the connecting rod, and a pressure roller is rotatably connected to the side of the connecting frame away from the elastic part.

[0012] Preferably, the support mechanism includes a support seat, one side of the support seat is fixedly connected to a support frame, the top of the support seat is respectively provided with a first connecting frame, a second connecting frame and a third connecting frame, the number of the first connecting frame, the second connecting frame and the third connecting frame are two, and they are symmetrically distributed on both sides of the top of the support seat, the second connecting frame is provided with a sliding groove, the slider is slidably connected to the inner side of the second connecting frame through the sliding groove, and one side of the second connecting frame is fixedly connected to a support plate.

[0013] Preferably, the stretching roller group includes a first power member, a first power member, a second power member and a third power member are fixedly installed on one side of the second connecting frame, the output end of the first power member is fixedly connected to the first stretching roller, the output end of the second power member is fixedly connected to the second stretching roller, the output end of the third power member is fixedly connected to the third stretching roller, the first stretching roller, the second stretching roller and the third stretching roller are all located between the two second connecting frames, and the first guide roller, the second guide roller and the third guide roller are rotatably connected to the second connecting frame.

[0014] Preferably, the liquid inlet and outlet mechanism includes a water outlet pipe, to which a first connecting pipe group, a second connecting pipe group and a third connecting pipe group are fixedly connected, a first connecting pipe group is provided with a first rotating joint, a second connecting pipe group is provided with a second rotating joint, one end of the first connecting pipe group and the second connecting pipe group away from the water outlet pipe is fixedly connected to a hot water pipe, a third connecting pipe group is provided with a third rotating joint, and one end of the third connecting pipe group away from the water outlet pipe is fixedly connected to a cold water pipe.

[0015] Preferably, the first connecting pipe group is rotatably connected to the preheating roller group through a first rotating joint.

[0016] Preferably, the second connecting tube group is rotatably connected to the stretching roller group via a second rotating joint.

[0017] Preferably, the third connecting pipe group is rotatably connected to the cooling roller group via a third rotating joint.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The film longitudinal stretching device is provided with a clamping assembly. When in use, a slider can be slid according to the position of the intersection of the polypropylene film and the stretching roller group to adjust the position of the pressure roller, so that the pressure roller can continuously maintain pressure on the position of the intersection of the film and the stretching roller group to avoid slipping of the film, thereby ensuring the effect of stretching the film.

[0020] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the working state of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the support mechanism of the utility model;

[0024] Figure 4 For this utility model Figure 3 A schematic diagram of the structure enlargement at the center A;

[0025] Figure 5 This is a schematic diagram of the structure of the stretching roller group of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the clamping assembly of the utility model;

[0027] Figure 7 For this utility model Figure 6 A schematic diagram of the structure enlarged at B in the middle;

[0028] Figure 8 It is a structural schematic diagram of the liquid inlet and outlet mechanism of the utility model.

[0029] In the figure: 1, support mechanism; 101, support seat; 102, support frame; 103, first connecting frame; 104, second connecting frame; 105, third connecting frame; 106, slide; 107, support plate; 2, preheating roller group; 3, stretching roller group; 301, first power member; 302, second power member; 303, third power member; 304, first stretching roller; 305, second stretching roller; 306, third stretching roller; 307, first guide roller; 308, second guide roller; 309, first Three guide rollers; 4. Cooling roller group; 5. Clamping assembly; 501. Connecting rod; 502. Sliding block; 503. Fixing bolt; 504. Sliding bar; 505. Connecting frame; 506. Elastic member; 507. Pressing roller; 6. Liquid inlet and outlet mechanism; 601. Water outlet pipe; 602. First connecting pipe group; 603. Second connecting pipe group; 604. First rotating joint; 605. Second rotating joint; 606. Hot water pipe; 607. Third connecting pipe group; 608. Third rotating joint; 609. Cold water pipe. DETAILED DESCRIPTION

[0030] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] Additional aspects and advantages of the present invention will be further described below in conjunction with the accompanying drawings, and some will become apparent from the following description or be learned through practice of the present invention.

[0033] like Figure 1 and Figure 2 As shown, a film longitudinal stretching device comprises a support mechanism 1, a preheating roller group 2, a stretching roller group 3 and a cooling roller group 4 are respectively arranged on the top of the support mechanism 1, a pressing assembly 5 is slidably connected to the support mechanism 1, and a liquid inlet and outlet mechanism 6 is arranged on one side of the support mechanism 1;

[0034] like Figure 3 and Figure 4 As shown, the support mechanism 1 includes a support seat 101, a support frame 102, a first connecting frame 103, a second connecting frame 104, a third connecting frame 105, a slide groove 106 and a support plate 107. The support frame 102 is fixedly connected to one side of the support seat 101, and the first connecting frame 103, the second connecting frame 104 and the third connecting frame 105 are respectively arranged on the top of the support seat 101. The number of the first connecting frame 103, the second connecting frame 104 and the third connecting frame 105 is two, and they are symmetrically distributed on both sides of the top of the support seat 101. The second connecting frame 104 is provided with a slide groove 106, and one side of the second connecting frame 104 is fixedly connected to the support plate 107;

[0035] like Figure 2 and Figure 5As shown, the stretching roller group 3 includes a first power member 301, a second power member 302, a third power member 303, a first stretching roller 304, a second stretching roller 305, a third stretching roller 306, a first guide roller 307, a second guide roller 308 and a third guide roller 309. The first power member 301, the second power member 302 and the third power member 303 are fixedly installed on one side of the second connecting frame 104. The first power member 301, the second power member 302 and the third power member 303 are all fixedly installed on the support plate 107. The rotation speed of the second power member 302 is greater than the rotation speed of the first power member 301, and the rotation speed of the third power member 303 is greater than the rotation speed of the second power member 302. The output end of the first power member 301 is fixedly connected to the first stretching roller 304, and the output end of the second power member 302 is fixedly connected to the second stretching roller 304. Roller 305, the output end of the third power member 303 is fixedly connected with the third stretching roller 306, the first stretching roller 304, the second stretching roller 305 and the third stretching roller 306 are all located between the two second connecting frames 104, the second connecting frame 104 is rotatably connected with the first guide roller 307, the second guide roller 308 and the third guide roller 309, the first guide roller 307 is located between the first stretching roller 304 and the second stretching roller 305, the second guide roller 308 is located between the second stretching roller 305 and the third stretching roller 306, the third guide roller 309 is located between the third stretching roller 306 and the cooling roller group 4, the first stretching roller 304, the second stretching roller 305, the third stretching roller 306, the first guide roller 307, the second guide roller 308 and the third guide roller 309 are all rotatably connected to the second connecting frame 104;

[0036] like Figure 2 , Figure 6 and Figure 7 As shown, the clamping assembly 5 includes a connecting rod 501, a slider 502, a fixing bolt 503, a sliding rod 504, a connecting frame 505, an elastic member 506 and a pressure roller 507. Both ends of the connecting rod 501 are fixedly connected with the slider 502. The slider 502 is slidably connected to the inner side of the second connecting frame 104 through the sliding groove 106. The side of the slider 502 away from the connecting rod 501 is provided with a fixing bolt 503. The screw on the fixing bolt 503 is located in the sliding groove 106. The adjusting head of the fixing bolt 503 is located on the outer side of the second connecting frame 104. The connecting rod 501 is slidably connected with the sliding rod 504. One end of the sliding rod 504 is fixedly connected with the connecting frame 505. An elastic member 506 is provided between the connecting frame 505 and the connecting rod 501. The side of the connecting frame 505 away from the elastic member 506 is rotatably connected with the pressure roller 507.

[0037] like Figure 2 and Figure 8As shown, the liquid inlet and outlet mechanism 6 includes a water outlet pipe 601, a first connecting pipe group 602, a second connecting pipe group 603, a first rotating joint 604, a second rotating joint 605, a hot water pipe 606, a third connecting pipe group 607, a third rotating joint 608 and a cold water pipe 609. The first connecting pipe group 602, the second connecting pipe group 603 and the third connecting pipe group 607 are fixedly connected to the water outlet pipe 601. The first connecting pipe group 602 is provided with a first rotating joint 604. The first connecting pipe group 602 is rotatably connected to the preheating roller group 2 through the first rotating joint 604. The second connecting pipe group 603 is provided with a There is a second rotating joint 605, and the second connecting pipe group 603 is rotatably connected to the stretching roller group 3 through the second rotating joint 605. The first connecting pipe group 602 and the second connecting pipe group 603 are fixedly connected to the hot water pipe 606 at one end away from the water outlet pipe 601. The third connecting pipe group 607 is provided with a third rotating joint 608. The third connecting pipe group 607 is rotatably connected to the cooling roller group 4 through the third rotating joint 608. The third connecting pipe group 607 is fixedly connected to the cold water pipe 609 at one end away from the water outlet pipe 601. The water outlet pipe 601, the hot water pipe 606 and the cold water pipe 609 are all located on the support frame 102.

[0038] The working process of the utility model is as follows:

[0039] S1. Before use, hot water is continuously added to the hot water pipe 606. The hot water enters the stretching roller group 3 through the second connecting pipe group 603 and the second rotating joint 605, and enters the preheating roller group 2 through the first connecting pipe group 602 and the first rotating joint 604. After the hot water heats the stretching roller group 3 and the preheating roller group 2, it flows into the water outlet pipe 601 along the second connecting pipe group 603 and the first connecting pipe group 602, and flows out from the water outlet pipe 601.

[0040] S2. At the same time, cold water is continuously added to the cold water pipe 609. The cold water enters the cooling roller group 4 through the third connecting pipe group 607 and the third rotating joint 608. After cooling the cooling roller group 4, the cold water flows into the water outlet pipe 601 along the third connecting pipe group 607 and flows out from the water outlet pipe 601.

[0041] S3, when in use, the polypropylene film passes by the preheating roller group 2, the stretching roller group 3 and the cooling roller group 4 in sequence, and the slider 502 is slid according to the position of the tangent point between the polypropylene film and the stretching roller group 3, and the position of the pressing roller 507 is adjusted so that the position of the pressing roller 507 corresponds to the position of the tangent point between the polypropylene film and the stretching roller group 3;

[0042] S4. After the adjustment is completed, tighten the fixing bolt 503 to fix the position of the pressing roller 507. Under the action of the elastic member 506, the pressing roller 507 is pressed against the position of the tangent point between the polypropylene film and the stretching roller group 3;

[0043] S5, starting the first power member 301, the second power member 302 and the third power member 303. Since the rotation speed of the second power member 302 is greater than the rotation speed of the first power member 301, and the rotation speed of the third power member 303 is greater than the rotation speed of the second power member 302, the polypropylene film is longitudinally stretched when there is a speed difference among the first stretching roller 304, the second stretching roller 305 and the third stretching roller 306;

[0044] S6. During the film stretching process, the pressing roller 507 can continue to press the film and the tangent point of the stretching roller group 3 to prevent the film from slipping, thereby ensuring the effect of film stretching. After the stretching is completed, the polypropylene film can be stretched after being cooled by the cooling roller group 4.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The film longitudinal stretching device is provided with a clamping component 5. When in use, the slider 502 can be slid according to the position of the intersection of the polypropylene film and the stretching roller group 3, and the position of the pressing roller 507 can be adjusted, so that the pressing roller 507 can continue to maintain the pressure on the position of the intersection of the film and the stretching roller group 3 to avoid the film from slipping, thereby ensuring the effect of stretching the film. After the stretching is completed, the polypropylene film can be stretched after being cooled by the cooling roller group 4.

[0047] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A film longitudinal stretching device, characterized in that: It comprises a support mechanism (1), the top of which is respectively provided with a preheating roller group (2), a stretching roller group (3) and a cooling roller group (4), a pressing assembly (5) is slidably connected to the support mechanism (1), and a liquid inlet and outlet mechanism (6) is provided on one side of the support mechanism (1); The clamping assembly (5) comprises a connecting rod (501), both ends of the connecting rod (501) are fixedly connected with a slider (502), a fixing bolt (503) is provided on the side of the slider (502) away from the connecting rod (501), a sliding rod (504) is slidably connected to the connecting rod (501), one end of the sliding rod (504) is fixedly connected to a connecting frame (505), an elastic member (506) is provided between the connecting frame (505) and the connecting rod (501), and a pressure roller (507) is rotatably connected to the side of the connecting frame (505) away from the elastic member (506).

2. A film longitudinal stretching device according to claim 1, characterized in that: The support mechanism (1) comprises a support seat (101), one side of the support seat (101) is fixedly connected to a support frame (102), the top of the support seat (101) is respectively provided with a first connecting frame (103), a second connecting frame (104) and a third connecting frame (105), the number of the first connecting frame (103), the second connecting frame (104) and the third connecting frame (105) are two, and they are symmetrically distributed on both sides of the top of the support seat (101), the second connecting frame (104) is provided with a sliding groove (106), the sliding block (502) is slidably connected to the inner side of the second connecting frame (104) through the sliding groove (106), and one side of the second connecting frame (104) is fixedly connected to a support plate (107).

3. A film longitudinal stretching device according to claim 2, characterized in that: The stretching roller group (3) comprises a first power member (301); the first power member (301), a second power member (302) and a third power member (303) are fixedly mounted on one side of the second connecting frame (104); the output end of the first power member (301) is fixedly connected to a first stretching roller (304); the output end of the second power member (302) is fixedly connected to a second stretching roller (305); the output end of the third power member (303) is fixedly connected to a third stretching roller (306); the first stretching roller (304), the second stretching roller (305) and the third stretching roller (306) are all located between two of the second connecting frames (104); and the second connecting frame (104) is rotatably connected to a first guide roller (307), a second guide roller (308) and a third guide roller (309).

4. A film longitudinal stretching device according to claim 1, characterized in that: The liquid inlet and outlet mechanism (6) comprises a water outlet pipe (601), to which a first connecting pipe group (602), a second connecting pipe group (603) and a third connecting pipe group (607) are fixedly connected, the first connecting pipe group (602) is provided with a first rotating joint (604), the second connecting pipe group (603) is provided with a second rotating joint (605), one end of the first connecting pipe group (602) and the second connecting pipe group away from the water outlet pipe (601) is fixedly connected with a hot water pipe (606), the third connecting pipe group (607) is provided with a third rotating joint (608), and one end of the third connecting pipe group (607) away from the water outlet pipe (601) is fixedly connected with a cold water pipe (609).

5. A film longitudinal stretching device according to claim 4, characterized in that: The first connecting pipe group (602) is rotatably connected to the preheating roller group (2) via the first rotating joint (604).

6. A film longitudinal stretching device according to claim 4, characterized in that: The second connecting pipe group (603) is rotationally connected to the stretching roller group (3) via the second rotating joint (605).

7. A film longitudinal stretching device according to claim 4, characterized in that: The third connecting pipe group (607) is rotationally connected to the cooling roller group (4) via the third rotating joint (608).

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