CN116461063A - An automated plastic pallet production line - Google Patents

Abstract

The invention relates to the technical field of injection molding production lines, in particular to an automatic plastic tray production line which comprises an injection molding machine, wherein the injection molding machine comprises a shooting table part and a mold closing part which are matched with each other, the shooting table part comprises a melt adhesive cylinder and a screw rod arranged in the melt adhesive cylinder, the screw rod is divided into a connecting section, a feeding section, a compression section and a high mixing section along the feeding direction, the feeding section and the compression section are both threaded sections, and the tooth groove width and the tooth groove depth of the feeding section are both larger than those of the compression section.

Description

An automated plastic pallet production line

technical field

The invention relates to the technical field of injection molding production lines, in particular to an automatic plastic tray production line.

Background technique

At present, plastic pallets are widely used due to their advantages such as long service life and good impact resistance. The production process of plastic pallets is an injection molding process, so plastic pallet production lines need to use injection molding machines. Compared with other injection molded parts, the characteristics of plastic trays are: the length and width of plastic trays are large and the thickness is small, which leads to small clamping force and large injection volume required for plastic trays in the injection molding process.

Since the injection molding machine of the existing plastic tray production line usually adopts the standard injection molding machine on the market, that is, a small clamping force corresponds to a small injection volume, and a large clamping force corresponds to a large injection volume, so the injection molding machine of the existing plastic tray production line cannot well meet the production needs of plastic trays.

Contents of the invention

In order to meet the production requirements of small clamping force and large injection volume of plastic trays, the application provides an automated plastic tray production line.

An automated plastic pallet production line provided by the invention adopts the following technical scheme:

An automatic plastic tray production line includes an injection molding machine, the injection molding machine includes an injection unit and a mold clamping unit that cooperate with each other, the injection unit includes a melt cylinder and a screw arranged in the melt cylinder, the screw is divided into a connecting section, a feeding section, a compression section and a high mixing section along the feeding direction, the feeding section and the compression section are threaded sections, and the width and depth of the alveolar grooves of the feeding section are greater than the width and depth of the alveolar grooves of the compression section.

Preferably, the high mixing section is a non-threaded section, the high mixing section includes a first mixing section and a second mixing section, the first mixing section is provided with a plurality of grooves at intervals around its own rotation center, and the second mixing section is provided with a plurality of gear rings at intervals along its own axis.

Preferably, there are two groups of grooves, one group of grooves communicates with the feed end of the first mixing section, and the other set of grooves communicates with the discharge end of the first mixing section, and the grooves of the two groups are alternately distributed around the rotation center of the first mixing section.

Preferably, the angle between the groove and the feeding direction is 45°.

Preferably, the melt rubber barrel is provided with a material opening, and the left and right sides of the material opening are asymmetrical.

Preferably, the injection volume of the injection table part is 34643 cm ³ , and the clamping force of the mold clamping part is 2500t.

Preferably, the automated plastic tray production line also includes a first retrieving manipulator, a conveying table, a nozzle mechanism and a second reclaiming manipulator, the injection molding machine is arranged at the front end of the conveying platform, the first reclaiming manipulator is arranged on the mold clamping part of the injection molding machine, the first retrieving manipulator is used to pick and place the injection-molded plastic tray on the conveying platform, the shear nozzle mechanism and the second reclaiming manipulator are both arranged at the end of the conveying platform, and the second reclaiming manipulator is used to remove the plastic tray behind the nozzle.

Preferably, the automated plastic pallet production line also includes a waste material emptying device, the waste material emptying device is arranged at the end of the conveying table, and the waste material emptying device includes a second frame and a shaking mechanism arranged on the second frame, and the shaking mechanism is used for shaking the plastic pallet behind the water cutout on the second frame.

Preferably, the second frame body is also provided with a turning plate, and the bottom surface of the turning plate is used to abut against the plastic tray behind the nozzle after being turned down, and the bottom surface is provided with sandpaper.

Preferably, the second frame body is provided with a mounting frame, the mounting frame includes a fixed part and a movable part, the fixed part is fixed on the second frame body, the movable part is raised and lowered on the fixed part, and the flip plate is hinged on the movable part.

The beneficial effects of the present invention are:

1. After widening and deepening the alveolar of the feeding section, the gap between the feeding section and the melting rubber cylinder can be enlarged, so that there is a larger injection volume between the screw and the melting rubber cylinder, so as to meet the production needs of plastic trays with small clamping force and large injection volume, avoiding the excessive volume of the melting rubber cylinder caused by unilaterally increasing the injection volume of the melting rubber cylinder, and at the same time improving the feeding efficiency of the feeding section to further meet the production needs of plastic trays;

2. There is a mutation effect between the structure of the feeding section and the compression section of the screw, which can improve the plasticizing ability of the screw;

3. The high mixing section of the screw can fully mix the raw materials in the molten state in the first mixing section and the second mixing section respectively, so as to improve the color mixing effect of the raw materials in the molten state;

4. The material opening of the melt rubber cylinder is set as an asymmetric structure, which is convenient for rapid feeding of raw materials in solid state;

5. At present, the standard size of plastic pallets in China is 1200mm*1000* and 1100mm*1000mm. When using an injection molding machine with an injection volume of 34643cm ³ in the injection table and a clamping force of 2500t in the clamping part to inject plastic pallets, it can ensure sufficient injection volume during the injection molding process and avoid excessive clamping force;

6. The injection-molded plastic tray is picked up by the first pick-and-place manipulator and placed on the conveying table, and then conveyed backward by the conveying table to the nozzle mechanism. The nozzle mechanism cuts the injection nozzle produced in the injection molding process, and after cutting, it is taken out by the second pick-and-place robot to realize the automatic production of plastic trays;

7. The setting of the shaking mechanism is used to shake the plastic tray behind the nozzle to shake off the waste remaining on the plastic tray. During the shaking process, the abrasive paper also smoothes the sharp edge of the plastic tray due to the nozzle, and the waste generated during the grinding process is easy to fall due to the shaking process.

Description of drawings

Fig. 1 is the overall schematic diagram of the automated plastic tray production line in the first embodiment of the present application;

Fig. 2 is the structural representation of the screw rod in embodiment one of the present application;

Fig. 3 is the schematic sectional view of the A-A direction of screw rod in Fig. 2;

Fig. 4 is a schematic sectional view of the B-B direction of the screw in Fig. 2;

Fig. 5 is a schematic structural view of the melt glue cylinder in Embodiment 1 of the present application;

Fig. 6 is a schematic sectional view of the C-C direction of the melt glue cylinder in Fig. 5;

Fig. 7 is a schematic structural view of the nozzle mechanism in Embodiment 1 of the present application;

Fig. 8 is a schematic structural view of the waste emptying device in Embodiment 2 of the present application;

Explanation of reference numerals: 1, injection molding machine; 11, injection platform part; 12, clamping part; 2, screw rod; 21, connecting section; 22, feeding section; 23, compression section; 24, first mixing section; 241, groove; 25, second mixing section; The first roller; 53, the nozzle mechanism; 531, the scissors; 54, the six-axis manipulator; 6, the second frame body; 61, the second roller; 71, the slide rail; 72, the slider; 73, the mounting seat; 74, the cylinder; 75, the push plate; , The second connecting rod.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawings 1-8 and embodiments.

This embodiment discloses an automatic plastic pallet production line.

The automatic plastic pallet production line is used for the production and processing of plastic pallets. In order to better reflect the production and processing objects and usage scenarios corresponding to this production line, and to highlight the advantages of this production line, it is necessary to explain the characteristics of plastic pallets. Usually, pallets include plastic pallets and wooden pallets. Compared with wooden pallets, plastic pallets have better integrity, sanitation and cleanliness, and are easy to wash and disinfect. During use, they have the characteristics of light weight, no nails, acid and alkali resistance, and no mildew. The specific differences are shown in Table 1:

Table 1

Based on the above-mentioned advantages of plastic pallets, the demand for plastic pallets is increasing day by day. In order to better meet the demand for plastic pallets, it is necessary to use plastic pallet production lines to produce plastic pallets. It should be noted that since the plastic tray is an injection molded part, the plastic tray production line needs to use an injection molding machine. The injection molding machine uses the thrust of the screw or plunger to inject the plasticized molten plastic into the closed mold cavity, and obtain the finished product after solidification. Injection molding is a cyclic process. Each cycle mainly includes: quantitative feeding—melting and plasticizing—pressure injection—mold filling and cooling—mold opening and pick-up, taking out the plastic parts and then closing the mold to enter the next cycle. In order to realize the above process, the injection molding machine usually includes injection part, clamping part, hydraulic system and electrical control system and other parts, and the cavity is provided by the mold. The selection of an injection molding machine needs to refer to two parameters, one is the clamping force required during the injection molding process of the injection molded product, and the other is the injection volume required during the injection molding process of the injection molded product. The injection volume corresponds to the injection volume of the injection molding machine. If the clamping force is insufficient, it will cause flashing and burrs on the injection molded part. If the injection volume is insufficient, the injection molded part will not be fully formed.

Compared with ordinary injection molding products, due to the small thickness and large length and width of plastic trays, plastic trays require small clamping force and large injection volume, that is, the ratio of injection volume/clamping force used in plastic tray injection molding is much greater than that of ordinary injection molding products. At present, the standard size of plastic trays in China is 1200mm*1000* and 1100mm*1000mm, and the thickness is about 110mm. If the standard injection molding machine on the market is used to inject plastic trays, the following two situations will occur: one is that the clamping force of the injection molding machine (such as an injection molding machine with a clamping force of 2500t) is appropriate, but the injection volume is insufficient, so that the plastic tray cannot be produced; the other is the injection molding machine (such as an injection molding machine with a clamping force of 3300t). The injection volume is appropriate, but the maximum clamping force of the injection molding machine is greater than the clamping force required by the plastic pallet, resulting in a waste of clamping force and a waste of factory space, increasing costs. Therefore, the injection molding machines of the existing plastic pallet production line cannot well meet the production needs of plastic pallets.

With reference to Fig. 1, the automatic plastic tray production line of the present application comprises injection molding machine 1, and injection molding machine 1 is a horizontal injection molding machine, and its clamping part 12 and injection part 11 are on the same horizontal center line, and mold is opened along the horizontal direction. The injection molding machine 1 includes an injection unit 11 and a clamping unit 12 that cooperate with each other. The injection volume of the injection unit 11 is 34643 cm ³ , and the clamping force of the clamping unit 12 is 2500 tons. Adaptive adjustments are made at the connection between the clamping unit 12 and the injection unit 11 so that the ratio of injection volume/clamping force can better correspond to the shape of the plastic tray, thereby ensuring sufficient injection volume during the injection molding process and avoiding excessive clamping force.

Referring to FIGS. 2 to 4 , the automatic plastic tray production line of the present application is also improved on the screw rod 2 of the injection molding machine 1. It should be noted that, referring to FIGS. Referring to Fig. 2 to Fig. 4, the screw 2 along the feeding direction is successively composed of a connecting section 21, a feeding section 22, a compression section 23 and a high mixing section, wherein the connecting section 21 is used to connect the driving part of the screw 2 to make the screw 2 rotate; The raw materials are extruded through the extrusion head. Wherein, both the feeding section 22 and the compression section 23 are threaded sections, and the alveolar of the feeding section 22 is widened and deepened, so that the width and depth of the alveolar of the feeding section 22 are larger than the width and depth of the alveolar of the compression section 23. One of the purposes is to make the gap between the feeding section 22 and the melting rubber barrel 3 larger, so that there is a larger injection volume between the screw 2 and the melting rubber barrel 3, so as to meet the production needs of plastic pallets with small clamping force and large injection volume, and avoid unilaterally increasing the melting glue barrel 3 The volume of the melt rubber cylinder 3 is too large due to the injection volume of the injection tube. The second purpose is to improve the feeding efficiency of the feeding section 22, thereby improving the feeding efficiency of the screw 2. The third purpose is to make the structure between the feeding section 22 and the compression section 23 form a sudden change effect, which is used to improve the plasticizing ability of the screw 2 to the raw materials in the molten state.

2 to 4, the high mixing section is a non-threaded section, and the high mixing section includes a first mixing section 24 and a second mixing section 25 along the feeding direction. The first mixing section 24 is provided with grooves 241 around its own rotation center. And the two groups of grooves 241 all have the same angle with the feeding direction. In this embodiment, the angle between the grooves 241 and the feeding direction is 45°, and the number of each group of grooves 241 is eight, so that the first mixing section 24 has eight feeding positions and eight discharging positions. The second kneading section 25 is provided with toothed rings 251 arranged at uniform intervals along its own axis, and arc-shaped grooves 241 are formed between the teeth of the toothed rings 251 . Through the structural design of the first mixing section 24 and the second mixing section 25, the high mixing section has a high mixing effect. In addition, a transition section is connected between the first mixing section 24 and the second mixing section 25. The diameter of the transition section is smaller than the diameter of the first mixing section 24 and the second mixing section 25, so that the raw materials transition from the first mixing section 24 to the second mixing section 25.

Referring to Fig. 5 and Fig. 6, the melt rubber cylinder 3 is provided with a feed port 31, and the lower end of the material cylinder 4 is connected to the feed port 31 of the melt rubber drum 3, so that the feed cylinder 4 and the melt rubber drum 3 are internally connected to realize the feeding function of the feed drum 4. The automatic plastic pallet production line of the present application has also made improvements at the feed port 31. The improvement point is that in the prior art, the left and right sides of the feed port 31 are symmetrical structures, but in this application, the left and right sides of the feed port 31 are asymmetrical structures to increase the feeding speed.

Referring to Fig. 1 , in the automatic plastic tray production line in this embodiment, there are two injection molding machines 1, and the clamping parts 12 of the two injection molding machines 1 are provided with a first reclaiming manipulator. In this embodiment, the first reclaiming manipulator is a three-axis manipulator 51, and a conveying table 52 is arranged between the two injection molding machines 1. The conveying table 52 includes a first frame body 521, a plurality of first rollers 522 and a conveying drive member for driving the first rollers 522 to rotate, and a plurality of first rollers 522 Both are rotatably arranged on the first frame body 521, and the three-axis manipulator 51 is used to clamp the injection-molded plastic tray onto the conveying platform 52, and the conveying platform 52 transports the plastic tray to the end. Since the plastic tray will produce an injection nozzle after injection molding, therefore, the end of the conveying table 52 is also provided with a nozzle mechanism 53. Referring to FIG. The end of the conveying table 52 is also provided with a second reclaiming manipulator. In this embodiment, the second reclaiming manipulator is a six-axis manipulator 54, and the six-axis manipulator 54 is used to discharge the plastic tray behind the nozzle.

The implementation principle of the automatic plastic tray production line in this embodiment is: the injection-molded plastic tray is picked up by the first pick-and-place manipulator and placed on the conveying table 52, and then conveyed backward by the conveying table 52 to the nozzle mechanism 53. The nozzle mechanism 53 cuts the injection nozzle generated during injection molding, and after cutting, it is taken out by the second pick-and-place robot to realize the automatic production of plastic trays.

Example 2

The difference between this embodiment and Embodiment 1 is that: the automatic plastic pallet production line also includes a waste box and a waste emptying device.

Referring to Fig. 8, the waste box includes a first waste box, and the first waste box is arranged below the end of the conveying platform 52 for receiving the waste cut by the water-cutting mechanism 53 . The waste material emptying device is arranged outside the end of the conveying table 52. The purpose of setting up the waste material emptying device is: after the nozzle mechanism 53 cuts the injection nozzle of the plastic tray and the six-axis manipulator 54 discharges the plastic tray, there will be a part of the waste cut by the nozzle structure remaining on the plastic tray.

Referring to Fig. 8, the waste material emptying device includes a second frame body 6 and a shaking mechanism. The second frame body 6 is arranged on the ground. The top of the second frame body 6 is provided with a plurality of second rollers 61. The rotating shafts of the plurality of rollers are parallel to each other, and the plurality of rollers are evenly spaced horizontally. They are the a direction and b direction of the plastic tray respectively. The shaking mechanism includes two sets of push assemblies arranged on the second frame body 6. One set of push assemblies is arranged in the direction a of the plastic tray and the set of push assemblies is used to push the plastic tray to the direction b. The other set of push assemblies is arranged in the direction b of the plastic tray and is used to push the plastic tray to the direction a. Specifically, the push assembly includes a slide rail 71, a slide block 72, a mounting seat 73, a cylinder 74 and a push plate 75. The slide rail 71 is fixedly arranged on the second frame body 6, and the slide block 72 is slidably arranged on the slide rail 71. The slide block 72 slides back and forth along the a direction and the b direction on the slide rail 71. The push plate 75, the cylinder 74, the mount seat 73 and the slide block 72 are sequentially fixedly connected. The push plate 75 is used to push the plastic tray. Connecting rod 91, wherein one set of pushing components is connected with a shaking driver, and the shaking driving member is a motor 76. The output shaft of the motor 76 is connected with a disk, and a second connecting rod 92 is connected between the disk and the mounting seat 73. The first connecting rod 91 is connected between the mounting bases 73 of the components, so the motor 76 controls the mounting bases 73 of the two sets of push components to reciprocate simultaneously, thereby controlling the push plates 75 of the two sets of push components to alternately push the plastic pallets to achieve a shaking effect on the plastic pallets. Wherein, the push plate 75 is specifically connected to the outer end of the telescopic rod of the cylinder 74 and the telescopic direction of the telescopic rod of the cylinder 74 is a direction that is close to or away from the plastic pallet, so that the distance of the push plate 75 between the two groups of push components is adjustable, so that the plastic pallet is put into and adjusted according to the size of the plastic pallet. In addition, the waste box also includes a second waste box, which is arranged at the bottom of the second roller 61 and is used to receive injection molding waste shaking and falling from the plastic pallet.

Referring to Figure 8, since the injection nozzle of the plastic tray is prone to sharp edges after shearing, resulting in cuts on the skin when the plastic tray is used later, the waste emptying device of the automated plastic tray production line of the present application is also provided with a friction mechanism. The friction mechanism includes a turning plate 81 that can be turned up and down. The bottom surface of the turning plate 81 is provided with a sandpaper 82. During the working process, the turning plate 81 is kept vertically upturned. When the six-axis manipulator 54 places the plastic tray cut by the injection molding nozzle on the second roller 61 of the second frame body 6, the turning plate 81 is turned down to a horizontal state and the sandpaper 82 is in contact with the top surface of the plastic tray, so that the plastic tray also rubs against the sandpaper 82 during the subsequent shaking process. , so as to smooth the sharp edge produced after shearing the injection nozzle, so as to reduce the situation of cutting the skin when the plastic tray is used later, and the waste generated by friction is also easy to fall to the second waste bin under the second roller 61 during the shaking process, which is convenient for collection. The abrasive paper 82 in this embodiment is composed of wood fiber paper+alumina abrasive particles. In other embodiments, it can also be the abrasive paper 82 of other materials, as long as it can achieve the effect of smoothing the sharp edge of the plastic tray due to shearing. In order to realize the overturning of the overturning plate 81, the friction mechanism also includes a mounting frame 84 and an overturning driving member. The mounting frame 84 is arranged on one side of the second frame body 6. The overturning driving part is a hydraulic motor 83, and the hydraulic motor 83 is fixedly arranged on the mounting frame 84. The driving gear drives the driven gear to rotate, and the driven gear drives the turning plate 81 to turn over, thereby realizing the turning process of the turning plate 81. Further, the installation frame 84 includes a fixed part 841 and a movable part 842. The fixed part 841 is used to be fixed on the second frame body 6. The movable part 842 is connected to the hydraulic motor 83 and the flip plate 81. The movable part 842 is lifted and connected to the fixed part 841. The movable part 842 is fixed in the fixed seat by screws. The sharp edge produced by shearing the injection nozzle.

All the above are preferred embodiments of the present invention, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims (10)

1. An automatic change plastics tray production line, its characterized in that: including injection molding machine (1), injection molding machine (1) is including penetrating platform portion (11) and compound die portion (12) of mutually supporting, penetrate platform portion (11) and be in including melt adhesive section of thick bamboo (3) and setting screw rod (2) in melt adhesive section of thick bamboo (3), screw rod (2) divide into linkage segment (21), pay-off section (22), compression section (23) and high mixed section along the pay-off direction, pay-off section (22) with compression section (23) are the screw thread section, the tooth socket width and the tooth socket depth of pay-off section (22) are all greater than the tooth socket width and the tooth socket depth of compression section (23).

2. An automated plastic pallet production line according to claim 1, wherein: the high mixing section is a non-threaded section, the high mixing section comprises a first mixing section (24) and a second mixing section (25), the first mixing section (24) is provided with a plurality of grooves (241) at intervals around the rotation center of the first mixing section, and the second mixing section (25) is provided with a plurality of gear rings at intervals along the axis of the second mixing section.

3. An automated plastic pallet production line according to claim 2, wherein: two groups of grooves (241) are formed, one group of grooves (241) is communicated with the feeding end of the first mixing section (24), the other group of grooves (241) is communicated with the discharging end of the first mixing section (24), and the two groups of grooves (241) are distributed around the rotation center of the first mixing section (24) in a staggered mode.

4. An automated plastic pallet production line according to claim 3, wherein: the angle between the groove (241) and the feeding direction is 45 degrees.

5. An automated plastic pallet production line according to claim 1, wherein: the melt adhesive cylinder (3) is provided with a material opening (31), and an asymmetric structure is arranged between the left side and the right side of the material opening (31).

6. An automated plastic pallet production line according to claim 1, wherein: the injection volume of the injection stage part (11) is 34643cm ³ The clamping force of the clamping part (12) is 2500t.

7. An automated plastic pallet production line according to claim 1, wherein: the automatic plastic tray production line further comprises a first material taking manipulator, a conveying table (52), a water gap shearing mechanism (53) and a second material taking manipulator, wherein the injection molding machine (1) is arranged at the front end of the conveying table (52), the first material taking manipulator is arranged on a mold clamping part (12) of the injection molding machine (1) and is used for taking and placing plastic trays subjected to injection molding on the conveying table (52), the water gap shearing mechanism (53) and the second material taking manipulator are arranged at the tail end of the conveying table (52), and the second material taking manipulator is used for taking away plastic trays subjected to water gap shearing.

8. An automated plastic pallet production line according to claim 7, wherein: the automatic plastic tray production line further comprises a waste material emptying device, the waste material emptying device is arranged at the tail end of the conveying table (52), the waste material emptying device comprises a second frame body (6) and a shaking mechanism arranged on the second frame body (6), and the shaking mechanism is used for shaking the plastic tray after water cutting openings on the second frame body (6).

9. An automated plastic pallet production line according to claim 8, wherein: the second frame body (6) is also provided with a turnover plate (81), the bottom surface of the turnover plate (81) is used for abutting against a plastic tray behind a water shearing port after being turned down, and the bottom surface is provided with frosted paper (82).

10. An automated plastic pallet production line according to claim 9, wherein: be provided with mounting bracket (84) on second support body (6), mounting bracket (84) are including fixed part (841) and movable part (842), fixed part (841) are fixed on second support body (6), movable part (842) go up and down to set up on fixed part (841), flip plate (81) are articulated on movable part (842).