A tray plastic wrap packaging machine

Abstract

The present invention relates to a pallet cling film packaging machine, wherein a horizontal conveyor is located at the front end of a frame for conveying pallets, and the film feeding device is located at both sides of the horizontal conveyor for clamping and conveying the cling film, comprising two pairs of symmetrically arranged clamping belts, guide rollers, and a pressing mechanism, wherein the guide rollers are used to fix and place the cling film, the clamping belts are used to clamp and convey the cling film, and the pressing mechanism is used to tension the clamping belts and provide sufficient clamping force to complete the upper film coating of the pallet and the longitudinal tensioning of the cling film; the vertical conveyor is located at the rear end of the horizontal conveyor for conveying the pallet; the longitudinal sealing device is located at the rear end of the horizontal conveyor for longitudinally collecting and pressing the cling film; the transverse sealing and cutting device is located at the rear end of the longitudinal sealing device for cutting the cling film and sealing the fracture. The packaging machine of the present invention has a simple and compact structure, high working efficiency, and good stability, and can realize automatic and efficient packaging of pallets with cling film, thereby ensuring packaging efficiency and quality.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging machinery, relates to cling film packaging equipment, and in particular to a tray cling film packaging machine. Background Art

[0002] At present, tray cling film packaging machines are widely used in fresh food packaging. Tray cling film packaging machines are divided into four-fold film plate packaging machines, negative pressure packaging machines and semi-automatic packaging machines. Semi-automatic packaging machines require manual operation of some processes of the packaging machine, which consumes manpower and has poor packaging effect; the four-fold film plate packaging machine lifts the cling film through the horizontal conveying mechanism and the bracket lifting mechanism, and the folding mechanism folds the cling film to the bottom of the tray. A large number of servo motors are used to drive the actuators, which has a complex structure, high cost and low efficiency; the negative pressure packaging machine uses chain plates, chains, and horizontal conveyor belts to transport the packaging materials, and uses a combination of machinery and negative pressure to seal.

[0003] Through the search of published patents, two published patent documents similar to this patent application were found:

[0004] Comparative Document 1 discloses an automatic cling film packaging machine, publication number CN 105416641B. The film feeding mechanism of Comparative Document 1 only uses symmetrical conveyor belts to clamp and feed the film. In the process of conveying the cling film, the belt is a flexible soft material, and there is only a linear clamping force at the roller. In the actual film feeding of the prototype, the symmetrical conveyor belts on both sides will produce insufficient clamping force, which makes it very easy for the cling film to fall off; at the same time, the transverse cutting and sealing device of Comparative Document 1 uses a suction box to suck the film to realize the folding of the cling film, and cooperates with a scraper and a roller conveyor belt to realize the horizontal sealing by touching. Due to structural limitations, the roller conveyor belt for film touching can only complete one horizontal sealing by touching the film after one rotation, which is inefficient and complex in structure. There is only a small opening to cooperate with the suction box, which is easy to fail to fold the film, or the pallet is stuck at the bottom of the roller, causing serious damage to the pallet.

[0005] Comparative Document 2 discloses a cutting and sealing device for a tray cling film packaging machine, CN 109866981A. Comparative Document 2 can complete the transverse cutting and sealing of the cling film, but the transverse film sealing device is driven by a cylinder, which is an intermittent motion device. When performing the rear transverse sealing, the pallet needs to stop and wait for the cylinder to move, resulting in low packaging efficiency. At the same time, the cylinder pushing the film can easily cause sticking to the film and damage or tear the cling film, resulting in poor packaging effect. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a tray cling film packaging machine with a simple and ingenious structure, low manufacturing cost and the ability to efficiently package fresh food, improve packaging efficiency and ensure packaging quality.

[0007] The present invention solves the technical problem by the following technical solutions:

[0008] A pallet cling film packaging machine, characterized in that it comprises a frame, a horizontal conveyor, a film feeding device, a vertical conveyor, a longitudinal sealing device and a transverse sealing and cutting device, wherein the horizontal conveyor is located at the middle of the front end of the frame and is used to transport the pallet loaded with materials to the vertical conveyor, the film feeding devices are located at both sides of the horizontal conveyor and are used to transport and stretch the cling film to cover the pallet, the vertical conveyor is located behind the horizontal conveyor and is used to transport the pallet forward, the longitudinal sealing device is located behind the horizontal conveyor and is used to gather the cling film in the longitudinal direction and press the cling film, and the transverse sealing and cutting device is located behind the longitudinal sealing device and is used to cut the cling film and scrape it to the bottom of the pallet;

[0009] The film feeding device is composed of two pairs of symmetrically arranged inclined clamping belts, guide rollers, a first support plate, a second support plate and a pressing mechanism. The first support plate and the second support plate are installed on the frame for fixing the film feeding device. The clamping belt is located on the inner side of the first support plate and the second support plate for clamping and conveying the cling film. The pressing mechanism is located on the outer side of the first support plate and the second support plate. The guide rollers are fixedly installed on the frame and located above the horizontal conveyor for fixing the rolled cling film and inputting the cling film into the clamping belt.

[0010] Moreover, the pressing mechanism is composed of a first fixed block, a second fixed block, a screw rod, a nut, a pressing piece, a connecting plate and a smooth strip. The first fixed block and the second fixed block are fixed on the first support plate or the second support plate for fixing the pressing mechanism. The upper and lower ends of the screw rod are respectively connected to the second fixed block and the first fixed block and form a screw rod and nut mechanism with the nut. The pressing piece is fixed on the nut. The connecting plate is located below the pressing piece and is used to adjust the angle of the smooth strip. The smooth strip is located below the connecting plate.

[0011] Moreover, the transverse sealing and cutting device is composed of a cutter mechanism, a front blowing box, a scraper, a rear blowing box and a brush scraping mechanism. The cutter mechanism is located at the rear end of the longitudinal sealing device and is fixed on the frame for cutting the longitudinally sealed plastic film. The front blowing box is fixed at the front end of the cutter for folding the cut plastic film downward. The scraper is located at the rear end of the cutter mechanism for scraping the vertical plastic film at the front end of the tray to the bottom of the tray to complete the front end transverse sealing of the tray. The rear blowing box is located at the rear end of the scraper for folding the cut plastic film at the rear end of the tray downward. The brush scraping mechanism is located at the rear end of the rear blowing box and is fixed on the frame for scraping the vertical plastic film at the rear end of the tray to the bottom of the tray to complete the rear transverse sealing.

[0012] Moreover, the brush scraping mechanism is composed of a third support plate, a transmission shaft, a turntable, a fixed shaft, and a brush. The third support plate is installed on the frame to fix the transverse sealing mechanism, the transmission shaft is installed on the third support plate, the turntable is installed on the inner side of the third support plate and is connected to the transmission shaft, the fixed shaft is installed on the other side of the turntable, and the brush is installed in the long groove on the fixed shaft.

[0013] The advantages and beneficial effects of the present invention are:

[0014] The film feeding of the present invention adopts two pairs of inclined clamping belts to clamp and convey the cling film, and adopts a downward pressing mechanism to increase the clamping force of the clamping belts on the cling film. The design is scientific and reasonable, and the stability is high. The horizontal sealing process is carried out simultaneously with the tray conveying process, which saves the steps of completing the cling film packaging. The horizontal sealing adopts wind film blowing and brush film scraping mechanism, and the whole machine structure is simple and the stability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is another structural schematic diagram of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the film feeding device of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the pressing mechanism of the present invention;

[0019] Figure 5 It is a structural schematic diagram of the brush film scraping mechanism of the present invention;

[0020] Figure 6 It is another structural schematic diagram of the brush scraping film mechanism of the present invention.

[0021] Description of Reference Numerals

[0022] 1. Frame, 2. Film feeding device, 3. Horizontal conveyor, 4. Vertical conveyor, 5. Longitudinal sealing device, 6. Transverse sealing and cutting device, 201. First guide roller, 202. Second guide roller, 203. First support plate, 204. Tensioning roller, 205. First driven roller, 206. First driving belt, 207. First driven belt, 208. Second driven roller, 209. Pressing mechanism, 2091. First fixed block, 2092. Nut, 2093. Pressing member, 2094. Second fixed block, 2095. Screw, 2096. Adjusting slot, 2097. Connecting plate, 2098. First smooth strip, 2099. Second smooth strip, 210 .The second active belt, 211. The second driven belt, 212. The third driven roller, 213. The active roller, 214. The second support plate, 401. The first vertical conveyor belt, 402. The second vertical conveyor belt, 403. The hand wheel, 501. The film collecting plate, 502. The first pressure roller, 503. The second pressure roller, 601. The front blowing box, 602. The first linear bearing, 603. The upper knife seat, 604. The rear blowing box, 605. The second linear bearing, 606. The scraper, 607. The brush film scraping mechanism, 6071. The brush, 6072. The fixed shaft, 6073. The turntable, 6074. The third support plate, 6075. The transmission shaft, 608. The lower cutting knife. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0024] like Figure 1 As shown, a pallet cling film packaging machine comprises: a frame 1, a film feeding device 2, a horizontal conveyor 3, a vertical conveyor 4, a longitudinal sealing device 5, and a transverse sealing and cutting device 6. The horizontal conveyor 3 is located at the front end of the frame 1 and is used to place the pallet with materials and convey it to the vertical conveyor 4. The film feeding device 2 is located on both sides of the horizontal conveyor 3 and is used to convey and stretch the cling film to cover the pallet. The vertical conveyor 4 is located behind the horizontal conveyor 3 and is used to convey the pallet forward. The longitudinal sealing device 5 is located behind the horizontal conveyor 3 and is used to gather the cling film in the longitudinal direction and press the cling film to complete the longitudinal sealing of the cling film. The transverse sealing and cutting device 6 is located behind the longitudinal sealing device 5 and cuts the cling film from the middle of the two pallets and smoothes the cut cling film to the bottom of the pallet to complete the front and rear transverse sealing and complete the packaging process. The horizontal conveyor 3 is located at the front end of the frame 1 and includes a horizontal conveyor belt.

[0025] like Figure 2 , Figure 3As shown, the film feeding device 2 is located on both sides of the horizontal conveyor 3, and is composed of a first guide roller 201, a second guide roller 202, a first support plate 203, a tensioning roller 204, a first driven roller 205, a first driving belt 206, a first driven belt 207, a second driven roller 208, a pressing mechanism 209, a second driving belt 210, a second driven belt 211, a third driven roller 212, a driving roller 213, and a second support plate 214. The first support plate 203 and the second support plate 214 are installed on the frame 1. The driving roller 213, the first driven roller 205 and the tensioning roller 204 are located inside the first driving belt 206, and the first driving belt 206 is installed and tensioned. The first driving belt 206 is located on the side of the first support plate 203 close to the horizontal conveyor 3. The first driven belt 207 is located above the first driving belt 206 , and the second driven roller 208 and the third driven roller 212 are located inside the first driven belt 207 , and the first driven belt 207 is installed.

[0026] The pressing mechanism 209 is installed on the outside of the first support plate 203, and is used to press down the first driven belt 207, tighten it and provide sufficient clamping force. The second driving belt 210 and the second driven belt are installed on the inside of the second support plate 214, and the installation method is the same as the first driving belt 206 and the first driven belt 207. The first guide roller 201 and the second guide roller 202 are located above the horizontal conveyor 3 and installed on the frame 1.

[0027] like Figure 4 As shown, the pressing mechanism 209 is composed of a first fixed block 2091, a nut 2092, a pressing member 2093, a second fixed block 2094, a screw 2095, an adjustment slot 2096, a connecting plate 2097, a first smooth bar 2098, and a second smooth bar 2099. The first fixed block 2091 and the second fixed block 2094 are located outside the first support plate 203, the screw 2095 is connected to the first fixed block 2091 and the second fixed block 2094 at both ends, the nut 2092 is mounted on the screw 2095, the pressing member 2093 is mounted on the nut 2092, the connecting plate 2097 is located below the pressing member 2093, and the first smooth bar 2098 and the second smooth bar 2099 are located below the connecting block and mounted on the pressing member 2093.

[0028] The first smoothing strip 2098 and the second smoothing strip 2099 are provided with adjustment grooves 2096, which can adjust the downward pressing angle of the smoothing strips to adapt to different inclination angles of the conveyor belt.

[0029] The vertical conveyor 4 is composed of a first vertical conveyor belt 401 , a second vertical conveyor belt 402 and a hand wheel 403 . The first vertical conveyor belt 401 and the second vertical conveyor belt 402 are symmetrically arranged on both sides of the rear end of the horizontal conveyor 3 , and the hand wheel 403 is located outside the second vertical conveyor belt 402 .

[0030] The longitudinal sealing device 5 is composed of a film collecting plate 501, a first pressing roller 502 and a second pressing roller 503. The film collecting plate 501 is located at the rear end of the horizontal conveyor 3, and the first pressing roller 502 and the second pressing roller 503 are sequentially installed at the rear end of the film collecting plate 501.

[0031] like Figure 2 As shown, the transverse sealing and cutting device 6 is composed of a front blowing box 601, a first linear bearing 602, an upper knife seat 603, a rear blowing box 604, a second linear bearing 605, a scraper 606, a brush film scraping mechanism 607 and a lower cutter 608. The first linear bearing 602, the upper knife seat 603, the second linear bearing 605 and the lower cutter 608 constitute a cutter mechanism, which is located at the rear end of the longitudinal sealing device 5. The front blowing box 601 is located at the front end of the cutter mechanism and is installed above the vertical conveyor 4. The scraper 606 is located at the rear end of the cutter mechanism, and the rear blowing box 604 is located at the rear end of the cutter mechanism and is installed above the vertical conveyor 4. The brush film scraping mechanism 607 is located at the rear end of the rear blowing box 604 and is installed on the frame 1.

[0032] like Figure 5 , Figure 6 As shown, the brush film scraping mechanism 607 is composed of a brush 6071, a fixed shaft 6072, a rotating disk 6073, a third support plate 6074 and a transmission shaft 6075. The third support plate 6074 is located at the rear end of the rear blow box 604 and is installed on the frame 1. The transmission shaft 6075 is installed in the through hole of the third support plate 6074. The rotating disk 6073 is located on the inner side of the third support plate 6074 and is installed on the transmission shaft 6075. The fixed shaft 6072 is located on the other side of the rotating disk 6073 and is installed on the rotating disk 6073. A long groove is opened on the fixed shaft 6072, and the brush 6071 is installed in the long groove on the surface of the fixed shaft 6072.

[0033] The working principle of the present invention is:

[0034] The pallet loaded with materials is fed inwards from the horizontal conveyor 3, and at the same time, the cling film enters the film feeding device 2 through the first guide roller 201, and the first active belt 206, the first driven belt 207, the second active belt 210 and the second driven belt 211 clamp the cling film and feed it inwards, and the two pairs of clamping belts have a certain inclination angle; when feeding the film for the first time, the pressing height of the pressing mechanism 209 is adjusted, the screw rod 2095 in the pressing mechanism 209 rotates, and the nut 2092 drives the pressing member 2093 to apply pressure to the first driven belt 207 and the second driven belt 211, tightening the conveyor belt, increasing the clamping force, and achieving longitudinal tension of the cling film, and the symmetrical pressing mechanisms are adjusted in the same way; the cling film moves along the conveyor belt to complete the upper film coating of the pallet; the pallet is transported from the horizontal conveyor 3 to the vertical conveyor 4, and then the first vertical conveyor belt 401 and the second vertical conveyor belt 402 The pallet is conveyed forward, and the film collecting plate 501 gathers the cling film on both sides of the pallet to complete the side and bottom coating, and then the first pressing roller 502 and the second pressing roller 503 extrude and bond the cling film in the longitudinal direction; the vertical conveyor 4 conveys the pallet forward, the cutter 608 cuts the cling film and leaves a front end margin, the front blow box 601 blows air downward to complete the downward folding of the cling film at the front end of the pallet, and when the pallet is conveyed forward to the top of the scraper 606, the scraper 606 scrapes the cling film at the front end of the pallet to the bottom of the pallet, completing the horizontal front end sealing of the pallet; the vertical conveyor 4 continues to convey forward, the cutter 608 cuts the cling film and leaves a rear end margin, the rear blow box 604 blows air downward to complete the downward folding of the cling film at the rear end of the pallet, the transmission shaft 6075 drives the turntable 6073 to rotate, and the brush 6071 rotates to scrape the cling film at the rear end of the pallet to the bottom of the pallet, completing the horizontal rear end sealing of the pallet.

[0035] The tray cling film packaging machine of the present invention improves the structure of the film feeding device and adds a downward pressure mechanism in the middle of the conveyor belt roller, which can realize the flexible belt clamping the cling film over a large area and greatly enhance the clamping force; the belt is kept in a tensioned state, and within the adjustment range, the downward pressure mechanism can ensure that the clamping force meets the packaging requirements, and is effectively applicable to the transportation of various materials. According to the test, the prototype does not clamp and drop the film, and the film feeding is effectively realized;

[0036] A rotating flexible brush is used for film application. The film can be applied and sealed horizontally multiple times in one rotation, which greatly improves the efficiency. The low strength of the brush will not cause the problem of box jamming, which reduces energy consumption and improves the packaging success rate.

[0037] A rotating flexible brush is used to seal the rear of the cling film horizontally. The tray can be transported synchronously when the rotating mechanism moves. The contact between the flexible brush and the cling film reduces the damage of the cling film, improves the packaging efficiency and makes the packaging beautiful without tearing or sticking.

[0038] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A tray cling film packaging machine, characterized in that: It includes a frame, a horizontal conveyor, a film feeding device, a vertical conveyor, a longitudinal sealing device and a transverse sealing and cutting device. The horizontal conveyor is located at the middle of the front end of the frame and is used to transport the pallet loaded with materials to the vertical conveyor. The film feeding devices are located on both sides of the horizontal conveyor and are used to transport and stretch the cling film to cover the pallet. The vertical conveyor is located behind the horizontal conveyor and is used to transport the pallet forward. The longitudinal sealing device is located behind the horizontal conveyor and is used to gather the cling film in the longitudinal direction and press the cling film. The transverse sealing and cutting device is located behind the longitudinal sealing device and is used to cut the cling film and scrape it to the bottom of the pallet. The film feeding device is composed of two pairs of symmetrically arranged inclined clamping belts, guide rollers, a first support plate, a second support plate and a pressing mechanism. The first support plate and the second support plate are installed on the frame for fixing the film feeding device. The clamping belt is located on the inner side of the first support plate and the second support plate for clamping and conveying the cling film. The pressing mechanism is located on the outer side of the first support plate and the second support plate. The guide rollers are fixedly installed on the frame and located above the horizontal conveyor for fixing the rolled cling film and feeding the cling film to the clamping belt. The pressing mechanism is composed of a first fixed block, a second fixed block, a screw rod, a nut, a pressing piece, a connecting plate and a fluent strip. The first fixed block and the second fixed block are fixed on the first support plate or the second support plate to fix the pressing mechanism. The upper and lower ends of the screw rod are respectively connected to the second fixed block and the first fixed block and form a screw rod and nut mechanism with the nut. The pressing piece is fixed on the nut. The connecting plate is located below the pressing piece and is used to adjust the angle of the fluent strip. The fluent strip is located below the connecting plate. The transverse sealing and cutting device is composed of a cutter mechanism, a front blowing box, a scraper, a rear blowing box and a brush film scraping mechanism. The cutter mechanism is located at the rear end of the longitudinal sealing device and is fixed on the frame for cutting the vertically sealed cling film. The front blowing box is fixed at the front end of the cutter for folding the cut cling film downward. The scraper is located at the rear end of the cutter mechanism for scraping the vertical cling film at the front end of the tray to the bottom of the tray to complete the front end transverse sealing of the tray. The rear blowing box is located at the rear end of the scraper for folding the cut cling film at the rear of the tray downward. The brush film scraping mechanism is located at the rear end of the rear blowing box and is fixed on the frame for scraping the vertical cling film at the rear end of the tray to the bottom of the tray to complete the rear transverse sealing. The brush scraping mechanism is composed of a third support plate, a transmission shaft, a rotating disc, a fixed shaft, and a brush. The third support plate is mounted on the frame for fixing the transverse sealing mechanism. The transmission shaft is mounted on the third support plate. The rotating disc is mounted on the inner side of the third support plate and connected to the transmission shaft. The fixed shaft is mounted on the other side of the rotating disc. The brush is mounted in a long groove on the fixed shaft. The working principle is: The pallet loaded with materials is fed inward from the horizontal conveyor, and at the same time, the cling film enters the film feeding device through the first guide roller. The first active belt, the first driven belt, the second active belt and the second driven belt clamp the cling film and feed it inward. The two pairs of clamping belts have a certain inclination angle. When feeding the film for the first time, the pressing height of the pressing mechanism is adjusted, and the screw in the pressing mechanism rotates, and the nut drives the first driven belt and the second driven belt of the pressing member to apply pressure, tightening the conveyor belt, increasing the clamping force, and achieving the longitudinal tension of the cling film. The symmetrical pressing mechanisms are adjusted in the same way. The cling film moves along the conveyor belt to complete the upper film coating of the pallet. The pallet is transported from the horizontal conveyor to the vertical conveyor, and then the first vertical conveyor belt and the second vertical conveyor belt push the pallet to the vertical conveyor. During the forward conveying, the film collecting plate gathers the cling film on both sides of the pallet to complete the side and bottom coating, and then the first pressing roller and the second pressing roller extrude and bond the cling film in the longitudinal direction; the vertical conveyor conveys the pallet forward, the cutter cuts off the cling film and leaves a margin at the front end, the front blow box blows air downward to complete the downward folding of the cling film at the front end of the pallet, and when the pallet is conveyed forward to above the scraper, the scraper scrapes the cling film at the front end of the pallet to the bottom of the pallet, completing the horizontal front end sealing of the pallet; the vertical conveyor continues to convey forward, the cutter cuts off the cling film and leaves a margin at the rear end, the rear blow box blows air downward to complete the downward folding of the cling film at the rear end of the pallet, the drive shaft drives the turntable to rotate, the brush rotates, and the cling film at the rear end of the pallet is scraped to the bottom of the pallet, completing the horizontal rear end sealing of the pallet.

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