Automatic stretching device for plastic protective film

Abstract

The utility model provides an automatic stretching device for a plastic protective film, and belongs to the technical field of plastic film stretching. The automatic stretching device for the plastic protective film comprises a base, a longitudinal clamping mechanism is arranged at the top of the base, a transverse clamping mechanism is arranged at the top of the longitudinal clamping mechanism, and a standard table is fixedly installed at the top of the base; compared with the prior art, the film stretching device has the following beneficial effects that by arranging the longitudinal rod, when the first threaded block and the second threaded block drive the clamps to longitudinally stretch a film, the first clamp and the second clamp on the two sides of the first threaded block and the second threaded block can be driven by the first threaded block and the second threaded block to move towards the left side and the right side at the same time; therefore, the first clamp and the second clamp are driven to apply transverse force to the film, and the film is prevented from wrinkling to affect the quality of the stretched film.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic film stretching, in particular to an automatic stretching device for plastic protective film. Background Art

[0002] Plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, used for packaging and as a coating layer. At present, plastic packaging and plastic packaging products occupy an increasingly large share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical and other fields.

[0003] Patent No. CN212031143U proposes a polymer plastic film stretching device, including a motor, a force sensor, a left clamp, a test piece, a grating ruler, a right clamp, a piezoelectric ceramic, a slide rail, a driving screw, and a slider. The left and right sides of the base are slide rails, and the base is equipped with a slider. The left clamp and the right clamp are on the slider, and the test piece is installed between the left clamp and the right clamp. The left clamp is connected to the force sensor, and the grating ruler is installed on the left side of the right clamp. The slider is installed on the driving screw, and the driving screw is connected to the motor. The right clamp is connected to the piezoelectric ceramic. The structure of this mechanism is simple and easy to maintain. When the plastic film is placed on the test piece, it is clamped with a clamp. The sliding of the slider drives the sliding of the clamp on the slider. There is no need for manual stretching, which is simple and convenient.

[0004] When the existing device is used, the plastic film is only stretched in the longitudinal direction. This stretching method causes uneven force on both sides of the plastic film, thereby causing wrinkles in the plastic film when the stretched length is long.

[0005] Therefore, the present application provides a plastic protective film automatic stretching device to meet the needs. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide an automatic stretching device for a plastic protective film to solve the problem that the existing stretching mechanism only performs longitudinal stretching on the plastic film, resulting in wrinkles on the film.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A plastic protective film automatic stretching device comprises a base, a longitudinal clamping mechanism is arranged on the top of the base, a transverse clamping mechanism is arranged on the top of the longitudinal clamping mechanism, and a reference platform is fixedly installed on the top of the base;

[0009] A longitudinal clamping mechanism, the longitudinal clamping mechanism includes a positioning block, a servo motor, a bidirectional threaded shaft, a slide groove, a first threaded block and a second threaded block, the positioning block is fixedly installed on the top of the base, the slide groove is opened on the top of the base, a servo motor is fixedly installed on one side of the positioning block, a bidirectional threaded shaft is fixedly installed on the output end of the servo motor, one side of the bidirectional threaded shaft is threadedly sleeved with the first threaded block, and the other side of the bidirectional threaded shaft is threadedly sleeved with the second threaded block.

[0010] As a preferred solution, the longitudinal clamping mechanism also includes a slider, a first base plate, a first clamping plate, a first block, a hinge, an arc spring, a guide rail and a baffle, the slider is movably connected to the bottom of the first threaded block, the first base plate is fixedly connected to the top of the first threaded block, the first base plate is movably connected to the first clamping plate through a hinge, the bottom of the first clamping plate is fixedly connected to the first block, the top of the first base plate is fixedly connected to the guide rail, one side of the guide rail is fixedly connected to the baffle, one side of the guide rail is movably sleeved with an arc spring, the bottom of the arc spring is fixedly connected to the top of the first clamping plate, and the top of the arc spring is fixedly connected to one side of the baffle.

[0011] As a preferred solution, a groove adapted to the first clamping block is formed on the top of the first bottom plate, and the sliding block is movably connected inside the sliding groove.

[0012] As a preferred solution, the first threaded block and the second threaded block are symmetrically arranged with the bidirectional threaded axis as the center, the bidirectional threaded axis is arranged at the top of the slide groove, and the bidirectional threaded axis and the slide groove are arranged in the same direction.

[0013] As a preferred solution, the transverse clamping mechanism includes a first clamp and a second clamp, the first clamp and the second clamp are symmetrically arranged with the slide groove as the center, the first clamp and the second clamp both include a first cross bar, a second cross bar, a first connecting rod, a second connecting rod, a longitudinal rod and a second bottom plate, the first cross bar is fixedly installed on one side of the second threaded block, one side of the first cross bar is movably connected to the first connecting rod, one side of the first connecting rod is movably connected to the longitudinal rod, the top of the longitudinal rod is fixedly connected to the second bottom plate, one side of the second bottom plate is movably connected to the second connecting rod, one side of the second connecting rod is movably connected to the second cross bar, and the second cross bar is fixedly installed on one side of the first threaded block.

[0014] As a preferred solution, the transverse clamping mechanism also includes a first side plate, a second clamping plate, a second side plate, a limiting groove, a second clamping block and a linear spring, the first side plate is fixedly installed on the top of the base, the top of the first side plate is movably connected to the second clamping plate, one side of the second clamping plate is movably connected to the second side plate, limiting grooves are symmetrically provided on both sides of the second side plate, a linear spring is arranged inside the limiting groove, the bottom of the linear spring is fixedly connected to the second clamping block, and the top of the second clamping block is movably connected to one side of the second clamping plate.

[0015] As a preferred solution, the second clamping block is movably connected inside the limiting groove, and the second side plate and the first side plate are symmetrically arranged with the sliding groove as the center.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects:

[0017] 1. A plastic protective film automatic stretching device, by setting a longitudinal rod, when the first threaded block and the second threaded block drive the clamp to stretch the film longitudinally, the first clamp and the second clamp on both sides of the first threaded block and the second threaded block will move to the left and right sides at the same time under the drive of the first threaded block and the second threaded block, thereby driving the first clamp and the second clamp to apply lateral force to the film to avoid wrinkles in the film and affect the quality of the stretched film.

[0018] 2. A plastic protective film automatic stretching device, by setting a second clamping plate, when the film needs to be clamped, it is only necessary to flip the second clamping plate to the top of the second side plate with the first side plate as the center. At this time, the second clamping plate can be fixed to the top of the second side plate by manually pulling the second clamping block and then releasing it, so that the film is pressed on the top of the second bottom plate through the second clamping plate, which is convenient for clamping and simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0020] Figure 1 This is a schematic diagram of the main structure of a plastic protective film automatic stretching device;

[0021] Figure 2 It is a schematic diagram of the main structure of the longitudinal clamping mechanism of a plastic protective film automatic stretching device;

[0022] Figure 3 It is a schematic diagram of the partial structure of the longitudinal clamping mechanism of a plastic protective film automatic stretching device;

[0023] Figure 4 It is a schematic diagram of the main structure of the transverse clamping mechanism;

[0024] Figure 5 It is a schematic diagram of the local structure of the transverse clamping mechanism;

[0025] Figure 6 It is a partial cross-sectional schematic diagram of the transverse clamping mechanism.

[0026] [reference numerals]

[0027] 1. Base; 2. Longitudinal clamping mechanism; 201. Positioning block; 202. Servo motor; 203. Bidirectional threaded shaft; 204. Slide; 205. First threaded block; 206. Second threaded block; 207. Slider; 208. First bottom plate; 209. First clamping plate; 210. First clamping block; 211. Hinge; 212. Arc spring; 213. Guide rail; 214. Baffle; 3. Horizontal clamping mechanism; 31. First clamp; 32. Second clamp; 301. First cross bar; 302. Second cross bar; 303. First connecting rod; 304. Second connecting rod; 305. Longitudinal rod; 306. Second bottom plate; 307. First side plate; 308. Second clamping plate; 309. Second side plate; 310. Limiting groove; 311. Second clamping block; 312. Linear spring; 4. Reference table.

[0028] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example

[0031] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides an automatic stretching device for a plastic protective film, comprising a base 1, a longitudinal clamping mechanism 2 is arranged on the top of the base 1, a transverse clamping mechanism 3 is arranged on the top of the longitudinal clamping mechanism 2, and a reference platform 4 is fixedly installed on the top of the base 1;

[0032] like Figure 2 , Figure 3 and Figure 4 As shown, the longitudinal clamping mechanism 2 includes a positioning block 201, a servo motor 202, a bidirectional threaded shaft 203, a slide groove 204, a first threaded block 205 and a second threaded block 206. The positioning block 201 is fixedly installed on the top of the base 1, the slide groove 204 is opened on the top of the base 1, the servo motor 202 is fixedly installed on one side of the positioning block 201, the bidirectional threaded shaft 203 is fixedly installed on the output end of the servo motor 202, the first threaded block 205 is threadedly sleeved on one side of the bidirectional threaded shaft 203, and the second threaded block 206 is threadedly sleeved on the other side of the bidirectional threaded shaft 203.

[0033] The longitudinal clamping mechanism 2 also includes a slider 207, a first base plate 208, a first clamping plate 209, a first clamping block 210, a hinge 211, an arc spring 212, a guide rail 213 and a baffle 214. The slider 207 is movably connected to the bottom of the first threaded block 205, the first base plate 208 is fixedly connected to the top of the first threaded block 205, the first base plate 208 is movably connected to the first clamping plate 209 through the hinge 211, the bottom of the first clamping plate 209 is fixedly connected to the first clamping block 210, the top of the first base plate 208 is fixedly connected to the guide rail 213, one side of the guide rail 213 is fixedly connected to the baffle 214, one side of the guide rail 213 is movably sleeved with the arc spring 212, the bottom of the arc spring 212 is fixedly connected to the top of the first clamping plate 209, and the top of the arc spring 212 is fixedly connected to one side of the baffle 214.

[0034] A groove adapted to the first clamping block 210 is formed on the top of the first bottom plate 208 , and the sliding block 207 is movably connected inside the sliding groove 204 .

[0035] The first thread block 205 and the second thread block 206 are symmetrically arranged with the bidirectional threaded shaft 203 as the center. The bidirectional threaded shaft 203 is arranged at the top of the slide groove 204, and the bidirectional threaded shaft 203 and the slide groove 204 are arranged in the same direction.

[0036] It needs to be further explained that: when the plastic film needs to be clamped longitudinally, the first clamping plate 209 on the top of the first threaded block 205 is first opened. The specific operation is to manually pull the first clamping plate 209 and then flip it around the hinge 211. At this time, the first clamping plate 209 will separate from the first base plate 208 along the direction of the guide rail 213. At the same time, the arc spring 212 is squeezed and deformed by the first clamping plate 209. At this time, one side of the plastic film is placed on the top of the first base plate 208, and then the first clamping plate 209 is released. Under the action of the elastic force of the guide rail 213, the first clamping plate 209 is reset, and at the same time, one side of the plastic film is fixed to the top of the first base plate 208 through the first clamping block 210; to fix the other side of the plastic film, you only need to repeat the above operation on the top of the second threaded block 206.

[0037] like Figure 5 , Figure 6 As shown, the transverse clamping mechanism 3 includes a first clamp 31 and a second clamp 32, and the first clamp 31 and the second clamp 32 are symmetrically arranged with the slide groove 204 as the center. The first clamp 31 and the second clamp 32 both include a first cross bar 301, a second cross bar 302, a first connecting rod 303, a second connecting rod 304, a longitudinal rod 305 and a second bottom plate 306. The first cross bar 301 is fixedly installed on one side of the second threaded block 206, one side of the first cross bar 301 is movably connected to the first connecting rod 303, one side of the first connecting rod 303 is movably connected to the longitudinal rod 305, the top of the longitudinal rod 305 is fixedly connected to the second bottom plate 306, one side of the second bottom plate 306 is movably connected to the second connecting rod 304, one side of the second connecting rod 304 is movably connected to the second cross bar 302, and the second cross bar 302 is fixedly installed on one side of the first threaded block 205.

[0038] The transverse clamping mechanism 3 also includes a first side plate 307, a second clamping plate 308, a second side plate 309, a limiting groove 310, a second clamping block 311 and a linear spring 312. The first side plate 307 is fixedly installed on the top of the base 1, the top of the first side plate 307 is movably connected to the second clamping plate 308, one side of the second clamping plate 308 is movably connected to the second side plate 309, and limiting grooves 310 are symmetrically provided on both sides of the second side plate 309. A linear spring 312 is arranged inside the limiting groove 310, the bottom of the linear spring 312 is fixedly connected to the second clamping block 311, and the top of the second clamping block 311 is movably connected to one side of the second clamping plate 308.

[0039] The second clamping block 311 is movably connected inside the limiting groove 310 , and the second side plate 309 and the first side plate 307 are symmetrically arranged with the sliding groove 204 as the center.

[0040] What needs to be further explained is that: when it is necessary to clamp the plastic film horizontally, on the basis that the plastic film is clamped by the longitudinal clamping mechanism 2, it is only necessary to flip the second clamping plate 308 with the first side plate 307 as the axis until the second clamping plate 308 is flipped to the top of the second side plate 309, and then manually pull up the second clamping block 311. At this time, the part of the second clamping block 311 inside the limiting groove 310 presses the linear spring 312 upward to contract. When the second clamping plate 308 contacts the top of the second side plate 309, release the second clamping block 311. At this time, the linear spring 312 drives the second clamping block 311 inside the limiting groove 310 to move downward under the action of elastic force, thereby fixing the second clamping plate 308 on the top of the second side plate 309 through the second clamping block 311.

[0041] Working principle and use process of the utility model: During the use of the utility model, when a plastic protective film automatic stretching device is used, first, the plastic film is aligned with the reference table 4 and placed;

[0042] Next, when the plastic film needs to be clamped longitudinally, first open the first clamping plate 209 on the top of the first threaded block 205. The specific operation is to manually pull the first clamping plate 209 and then flip it around the hinge 211. At this time, the first clamping plate 209 will separate from the first base plate 208 along the direction of the guide rail 213. At the same time, the arc spring 212 is squeezed and deformed by the first clamping plate 209. At this time, place one side of the plastic film on the top of the first base plate 208, and then release the first clamping plate 209. Under the action of the elastic force of the guide rail 213, the first clamping plate 209 is reset, and at the same time, one side of the plastic film is fixed to the top of the first base plate 208 through the first clamping block 210. To fix the other side of the plastic film, you only need to repeat the above operation on the top of the second threaded block 206.

[0043] Next, when it is necessary to clamp the plastic film horizontally, on the basis that the plastic film is clamped by the longitudinal clamping mechanism 2, it is only necessary to flip the second clamping plate 308 with the first side plate 307 as the axis until the second clamping plate 308 is flipped to the top of the second side plate 309, and then the second clamping block 311 is manually pulled upward. At this time, the part of the second clamping block 311 inside the limiting groove 310 presses the linear spring 312 upward to contract, and when the second clamping plate 308 contacts the top of the second side plate 309, the second clamping block 311 is released. At this time, the linear spring 312 drives the second clamping block 311 inside the limiting groove 310 to move downward under the action of elastic force, thereby fixing the second clamping plate 308 on the top of the second side plate 309 through the second clamping block 311.

[0044] Finally, the bidirectional threaded shaft 203 is driven to rotate by starting the servo motor 202. When the bidirectional threaded shaft 203 rotates, the first threaded blocks 205 and the second threaded blocks 206 on both sides of the bidirectional threaded shaft 203 move to both sides of the slide groove 204 at the same time. At this time, the first bottom plate 208 and the first clamping plate 209 on the top of the first threaded block 205 and the second threaded block 206 respectively stretch the plastic film in the longitudinal direction; at the same time, when the first threaded block 205 and the second threaded block 206 move, the first cross bar 301 and the second cross bar 302 are driven to move synchronously. The movement of the first cross bar 301 and the second cross bar 302 drives the second connecting rod 304 and the first connecting rod 303 to pull the longitudinal rod 305 horizontally, thereby driving the second bottom plates 306 on the first clamp 31 and the second clamp 32 to stretch the plastic film in the horizontal direction.

[0045] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plastic protective film automatic stretching device, characterized in that: It comprises a base (1), a longitudinal clamping mechanism (2) is arranged on the top of the base (1), a transverse clamping mechanism (3) is arranged on the top of the longitudinal clamping mechanism (2), and a reference platform (4) is fixedly installed on the top of the base (1); A longitudinal clamping mechanism (2), the longitudinal clamping mechanism (2) comprising a positioning block (201), a servo motor (202), a bidirectional threaded shaft (203), a slide groove (204), a first threaded block (205) and a second threaded block (206), the positioning block (201) being fixedly mounted on the top of a base (1), the slide groove (204) being opened on the top of the base (1), a servo motor (202) being fixedly mounted on one side of the positioning block (201), a bidirectional threaded shaft (203) being fixedly mounted on the output end of the servo motor (202), a first threaded block (205) being threadedly sleeved on one side of the bidirectional threaded shaft (203), and a second threaded block (206) being threadedly sleeved on the other side of the bidirectional threaded shaft (203).

2. The automatic stretching device for plastic protective film according to claim 1, characterized in that: The longitudinal clamping mechanism (2) further comprises a slider (207), a first bottom plate (208), a first clamping plate (209), a first clamping block (210), a hinge (211), an arc spring (212), a guide rail (213) and a baffle (214); the slider (207) is movably connected to the bottom of the first threaded block (205); the first bottom plate (208) is fixedly connected to the top of the first threaded block (205); the first bottom plate (208) is movably connected to the first clamping plate (209) via the hinge (211); 209), the bottom of the first clamping plate (209) is fixedly connected to a first clamping block (210), the top of the first bottom plate (208) is fixedly connected to a guide rail (213), one side of the guide rail (213) is fixedly connected to a baffle (214), one side of the guide rail (213) is movably sleeved with an arc spring (212), the bottom of the arc spring (212) is fixedly connected to the top of the first clamping plate (209), and the top of the arc spring (212) is fixedly connected to one side of the baffle (214).

3. The automatic stretching device for plastic protective film according to claim 2, characterized in that: A groove adapted to the first clamping block (210) is provided on the top of the first bottom plate (208), and the sliding block (207) is movably connected inside the sliding groove (204).

4. The automatic stretching device for plastic protective film according to claim 1, characterized in that: The first threaded block (205) and the second threaded block (206) are symmetrically arranged with the bidirectional threaded shaft (203) as the center. The bidirectional threaded shaft (203) is arranged at the top of the slide groove (204), and the bidirectional threaded shaft (203) and the slide groove (204) are arranged in the same direction.

5. The automatic stretching device for plastic protective film according to claim 1, characterized in that: The transverse clamping mechanism (3) comprises a first clamp (31) and a second clamp (32), wherein the first clamp (31) and the second clamp (32) are symmetrically arranged with the slide groove (204) as the center, and the first clamp (31) and the second clamp (32) each comprise a first cross bar (301), a second cross bar (302), a first connecting rod (303), a second connecting rod (304), a longitudinal rod (305) and a second bottom plate (306), wherein the first cross bar (301) is fixedly mounted on the second threaded block (206). On one side, one side of the first cross bar (301) is movably connected to the first connecting rod (303), one side of the first connecting rod (303) is movably connected to the longitudinal rod (305), the top of the longitudinal rod (305) is fixedly connected to the second bottom plate (306), one side of the second bottom plate (306) is movably connected to the second connecting rod (304), one side of the second connecting rod (304) is movably connected to the second cross bar (302), and the second cross bar (302) is fixedly installed on one side of the first threaded block (205).

6. The automatic stretching device for plastic protective film according to claim 1, characterized in that: The transverse clamping mechanism (3) further comprises a first side plate (307), a second clamping plate (308), a second side plate (309), a limiting groove (310), a second clamping block (311) and a linear spring (312); the first side plate (307) is fixedly mounted on the top of the base (1); the top of the first side plate (307) is movably connected to the second clamping plate (308); one side of the second clamping plate (308) is movably connected to the second side plate (309); limiting grooves (310) are symmetrically provided on both sides of the second side plate (309); a linear spring (312) is arranged inside the limiting groove (310); the bottom of the linear spring (312) is fixedly connected to the second clamping block (311); the top of the second clamping block (311) is movably connected to one side of the second clamping plate (308).

7. The automatic stretching device for plastic protective film according to claim 6, characterized in that: The second clamping block (311) is movably connected inside the limiting groove (310), and the second side plate (309) and the first side plate (307) are symmetrically arranged with the sliding groove (204) as the center.

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