A mold and method for integral injection molding of pallet box door panel

Abstract

This invention proposes an integrated injection molding mold and method for pallet box door panels, relating to the field of mold technology. It involves setting multiple inserts, with at least one insert having a mounting position for placing a steel plate. Multiple bosses are spaced apart at the mounting position, and each boss has a positioning pin. A robot places the steel plate on the mounting position, allowing the positioning pins to be inserted into multiple positioning holes in the steel plate, and the steel plate to contact the bosses, thus fixing the steel plate to the insert. After the upper and lower mold bases are closed, a cavity structure is formed between the upper mold base and the multiple inserts. Molten plastic is poured into the sprue of the upper mold base using an injection molding machine to integrally form the pallet box door panel within the cavity structure. The molded pallet box door panel has an integrally formed steel plate inside. Compared to using a steel pipe core-pulling structure to install steel pipes, this method saves time on core pulling and steel pipe installation, improves production efficiency, and reduces labor costs.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to an integrated injection molding mold and method for pallet box door panels. Background Technology

[0002] Currently, pallet boxes are large loading and turnover boxes made on the basis of plastic pallets. They are suitable for the turnover or storage of products in factories, such as transporting car parts. However, car parts are generally heavy, and pallet boxes made of pure plastic cannot meet the requirements of high load capacity. Usually, multiple reinforcing steel pipes are installed on the door panel of the pallet box to improve its load capacity.

[0003] The traditional method of installing steel pipes involves having a steel pipe core-pulling structure inside the injection mold of the pallet box door panel. After the pallet box door panel is injection molded, the steel pipe core-pulling structure of the mold is pulled out from the pallet box door panel, and multiple reserved holes for installing steel pipes are formed on the pallet box door panel. Then, the steel pipes are manually hammered into the reserved holes with a rubber hammer, thereby installing the steel pipes inside the pallet box door panel.

[0004] However, due to the excessive length of the steel pipe core-pulling structure, whether it is installed during mold closing or removed after mold separation, the movement stroke of the steel pipe core-pulling structure is very long, resulting in a long injection molding cycle time, which seriously affects production efficiency. Furthermore, the installation of the steel pipe requires two workers to cooperate, which wastes labor costs and is not conducive to automated operation. In addition, the length of the steel pipe core-pulling structure generally exceeds 1.2 meters, while the cross-sectional length and width are only 25mm*13mm. After long-term production, the steel pipe core-pulling structure is extremely prone to deformation and breakage, resulting in extremely low mold stability. Summary of the Invention

[0005] In view of this, the present invention proposes an integrated injection molding mold and method for pallet box door panels to solve the problems of low production efficiency and easy deformation and breakage of the steel pipe core-pulling structure when using a steel pipe core-pulling structure to install steel pipes inside the pallet box door panels.

[0006] On the one hand, the technical solution of the present invention is implemented as follows: The present invention provides an integrated injection molding mold for a pallet box door panel, which includes an upper mold base and a lower mold base arranged opposite to each other, as well as a plurality of inserts;

[0007] The upper mold base has multiple pouring gates on its surface facing away from the lower mold base, and the pouring gates penetrate the upper mold base;

[0008] The lower mold base has multiple mounting slots on the side facing the upper mold base, and each mounting slot is used for mounting the corresponding insert;

[0009] At least one of the inserts is provided with a mounting position for placing a steel plate. The steel plate is provided with a plurality of positioning holes. The mounting position is provided with a plurality of protrusions at intervals. Each protrusion is provided with a positioning pin. Each positioning pin is inserted into a corresponding positioning hole so that the steel plate is fixed to the corresponding insert.

[0010] When the upper mold base and the lower mold base are closed, a cavity structure is formed between the upper mold base and the plurality of inserts, the pouring gate is connected to the cavity structure, and the steel plate is located inside the cavity structure.

[0011] Based on the above technical solutions, preferably, one side of the insert is provided with a plurality of protrusions, and the plurality of protrusions are arranged in a row at intervals along a first direction, and the multiple rows of protrusions are arranged in a column at intervals along a second direction. The first direction and the second direction are intersected. When the upper mold base and the lower mold base are closed, the gap between the plurality of protrusions and the gap between the upper mold base and the plurality of protrusions form the cavity structure.

[0012] Based on the above technical solutions, preferably, multiple protrusions located in the same row are recessed in the direction away from the upper mold base to form a placement plane, and multiple placement planes are coplanarly arranged to form the mounting position. The placement plane is provided with the boss and the positioning pin.

[0013] Based on the above technical solutions, preferably, the steel plate includes a first straight plate and a second straight plate arranged intersecting each other. The first straight plate is provided with a plurality of positioning holes. When the steel plate is placed in the mounting position, the first straight plate contacts the protrusion on the placement plane, and the positioning pin is inserted into the positioning hole. The second straight plate is inserted into the gap between two adjacent rows of protrusions.

[0014] Based on the above technical solutions, preferably, the integrated injection molding mold for the card box door panel further includes a limiting platform. The limiting platform is disposed on the side wall of the protrusion and is located in the gap between two adjacent rows of protrusions. When the second straight plate is inserted into the gap between two adjacent rows of protrusions, the limiting platform abuts against the side of the second straight plate facing away from the first straight plate.

[0015] Based on the above technical solutions, preferably, the insert has a main cooling channel and multiple sub-cooling channels inside, the multiple sub-cooling channels are respectively connected to the main cooling channel, and one end of each sub-cooling channel extends to connect with the outside of the insert, and the other end of each sub-cooling channel extends into the inside of the protrusion. The lower mold base is provided with a water inlet hole and a water outlet hole, the water inlet hole extends to connect with one of the sub-cooling channels, and the water outlet hole extends to connect with another sub-cooling channel.

[0016] Based on the above technical solutions, preferably, the boss is provided with a threaded hole, the positioning pin includes a positioning part and a connecting part connected end to end, the diameter of the positioning part is larger than the diameter of the threaded hole, and the diameter of the connecting part is adapted to the diameter of the threaded hole, and the circumferential sidewall of the connecting part is provided with a threaded structure.

[0017] When the steel plate needs to be installed inside the door panel of the pallet box, the connecting part is inserted into the threaded hole and connected to the threaded hole through the threaded structure so that the positioning part and the boss are in contact.

[0018] When it is necessary to manufacture the pallet box door panel made of pure plastic, the positioning pin is removed from the threaded hole and the bolt is threaded into the threaded hole.

[0019] Based on the above technical solution, preferably, the upper mold base is provided with a plurality of first support protrusions on the side facing the lower mold base, and the plurality of first support protrusions are arranged in sequence at intervals. The insert with the boss is provided with a plurality of second support protrusions, and the plurality of second support protrusions are arranged in sequence at intervals. When the upper mold base and the lower mold base are closed, the plurality of first support protrusions and the plurality of second support protrusions respectively abut against the opposite sides of the steel plate.

[0020] Based on the above technical solutions, preferably, the mounting position is further provided with multiple magnets, which are used to attract the steel plate.

[0021] On the other hand, the present invention provides a method for integral injection molding of pallet box door panels, which uses the integral injection molding mold for pallet box door panels as described in any of the preceding claims, and includes the following steps:

[0022] S1. Insert the connecting parts of multiple locating pins into the multiple threaded holes on the insert, and tighten the connecting parts so that the locating part of the locating pin contacts the boss on the insert.

[0023] S2. Install the multiple inserts into the multiple mounting slots on the lower mold base, and connect the multiple cooling sub-channels on the inserts to the water inlet and outlet holes on the lower mold base respectively.

[0024] S3. The robot places the steel plate on the installation position so that the positioning parts of the multiple positioning pins are respectively inserted into the multiple positioning holes of the steel plate.

[0025] S4. Close the upper mold base and the lower mold base to form a cavity structure between the upper mold base and the plurality of inserts;

[0026] S5. Molten plastic is poured into the sprue of the upper mold base using an injection molding machine to integrally form the pallet box door panel within the cavity structure.

[0027] S6. After the pouring is completed, wait for a predetermined time and inject cooling water into the water inlet so that the cooling water flows in the cooling sub-channels and cooling main channels of the insert.

[0028] The integrated injection molding mold for pallet box door panels of the present invention has the following advantages over the prior art:

[0029] (1) By setting multiple inserts, and at least one insert is provided with a mounting position for placing a steel plate, and multiple bosses are provided at intervals in the mounting position, and a positioning pin is provided on each boss, before the upper mold base and the lower mold base are closed, multiple inserts are installed in multiple assembly slots of the lower mold base respectively, and then the steel plate is placed on the mounting position by a robot so that multiple positioning pins are inserted into multiple positioning holes of the steel plate respectively, and the steel plate and the bosses are in contact, so that the steel plate is fixed on the insert. After the upper mold base and the lower mold base are closed, a cavity structure is formed between the upper mold base and multiple inserts. Molten plastic is poured into the sprue of the upper mold base by an injection molding machine to integrally form a pallet box door panel in the cavity structure. The formed pallet box door panel has an integrally formed steel plate inside. Compared with the method of installing steel pipe by setting a steel pipe core pulling structure, the time for core pulling and steel pipe installation can be saved, production efficiency can be improved, and labor costs can be saved.

[0030] (2) By setting a threaded hole on the boss, the positioning pin includes a positioning part and a connecting part connected end to end, and the diameter of the positioning part is larger than the diameter of the threaded hole. The diameter of the connecting part is matched with the diameter of the threaded hole. The circumferential side wall of the connecting part is provided with a threaded structure. When it is necessary to install a steel plate in the door panel of the pallet box, the connecting part can be inserted into the threaded hole so that the positioning part and the boss are in contact, so that the steel plate can be installed on the insert. When it is necessary to manufacture a pure plastic pallet box door panel, the positioning pin can be removed from the threaded hole and the bolt can be threaded into the threaded hole, so that the mold can have two states, namely the steel plate integral molding state and the pure plastic injection molding state, and can be switched between the two states according to production needs. Multiple products can be produced by one mold, reducing production costs.

[0031] (3) Multiple first support protrusions are provided on the side of the upper mold base facing the lower mold base, and multiple second support protrusions are provided on the insert with the boss. When the upper mold base and the lower mold base are closed, the multiple first support protrusions and multiple second support protrusions abut against the opposite sides of the steel plate respectively, which can prevent the steel plate from deforming during injection molding. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a perspective view of the lower mold base of an integrated injection molding mold for a pallet box door panel according to the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the insert of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the steel plate placed on the insert according to the present invention;

[0036] Figure 4 This is a perspective view of an integrated injection molding mold for a pallet box door panel according to the present invention;

[0037] Figure 5 This is a schematic diagram of the structure of the upper mold base of the present invention having a first supporting protrusion;

[0038] Figure 6 This is an enlarged schematic diagram of the insert of the present invention having a positioning pin;

[0039] Figure 7 This is a schematic diagram of the positioning pin of the present invention;

[0040] Figure 8 This is a cross-sectional view of the insert of the present invention;

[0041] Figure 9 This is a schematic diagram of the steel plate structure of the present invention;

[0042] Figure 10 This is a perspective view of the card box door panel of the present invention;

[0043] Figure 11 This is a flowchart illustrating the steps of an integrated injection molding method for a pallet box door panel according to the present invention.

[0044] Figure label:

[0045] 1. Upper mold base; 11. Sprue; 2. Lower mold base; 21. Assembly slot; 22. Water inlet; 23. Water outlet; 3. Insert; 31. Boss; 32. Locating pin; 321. Locating part; 322. Connecting part; 33. Protrusion; 34. Placement plane; 35. Threaded hole; 36. Main cooling channel; 37. Sub-cooling channel; 4. Steel plate; 41. Locating hole; 42. First straight plate; 43. Second straight plate; 5. Limiting platform; 6. First support protrusion; 7. Second support protrusion; 8. Magnet; 9. Card box door panel. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that in the XYZ coordinate system provided herein, the positive direction of the X-axis represents forward, and the negative direction of the X-axis represents backward; the positive direction of the Y-axis represents right, and the negative direction of the Y-axis represents left; the positive direction of the Z-axis represents downward, and the negative direction of the Z-axis represents upward. Furthermore, it should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0048] On the one hand, such as Figures 1 to 4 As shown, the present invention provides an integrated injection molding mold for a pallet box door panel, which includes an upper mold base 1 and a lower mold base 2 arranged opposite to each other, and a plurality of inserts 3;

[0049] The upper mold base 1 has a plurality of pouring ports 11 on the surface facing away from the lower mold base 2, and the pouring ports 11 penetrate the upper mold base 1;

[0050] The lower mold base 2 is provided with a plurality of mounting slots on the side facing the upper mold base 1, and each mounting slot is used for mounting the corresponding insert 3;

[0051] At least one of the inserts 3 is provided with a mounting position for placing a steel plate 4. The steel plate 4 is provided with a plurality of positioning holes 41. The mounting position is provided with a plurality of protrusions 31 at intervals. Each protrusion 31 is provided with a positioning pin 32. Each positioning pin 32 is inserted into a corresponding positioning hole 41 so that the steel plate 4 is fixed on the corresponding insert 3.

[0052] When the upper mold base 1 and the lower mold base 2 are closed, a cavity structure is formed between the upper mold base 1 and the plurality of inserts 3. The pouring port 11 is connected to the cavity structure, and the steel plate 4 is located inside the cavity structure.

[0053] Specifically, the integrated injection molding mold for pallet box doors can be used to produce pallet box doors 9 with steel plates 4 embedded inside, which can increase the load-bearing capacity of pallet box doors 9, improve production efficiency, and save labor costs.

[0054] The upper mold base 1 and the lower mold base 2 are arranged opposite each other in the vertical direction. The upper mold base 1 is located above the lower mold base 2. The outer contour of the upper mold base 1 is cubic. The upper surface of the upper mold base 1 may be provided with multiple pouring holes, and the lower surface of the upper mold base 1 may be provided with a recessed structure.

[0055] Multiple assembly slots 21 can be provided on the side of the lower mold base 2 facing the upper mold base 1. Each assembly slot 21 can be used for the installation of a corresponding insert 3. Multiple inserts 3 can be installed on multiple assembly slots 21 respectively, and at least one insert 3 is provided with a mounting position for placing a steel plate 4. In this embodiment, the steel plate 4 can be provided with multiple positioning holes 41, and multiple bosses 31 can be provided at intervals on the mounting position. Each boss 31 can be provided with a positioning pin 32. When the steel plate 4 is placed on the mounting position, multiple positioning pins 32 can be inserted into multiple positioning holes 41 respectively, so that the steel plate 4 can be fixed on the insert 3, and the steel plate 4 and the bosses 31 are in contact, so that there is a certain distance between the surface of the steel plate 4 and the surface of the insert 3.

[0056] When the upper mold base 1 and the lower mold base 2 are closed, a cavity structure can be formed between the recessed structure on the lower surface of the upper mold base 1 and the multiple inserts 3 on the lower mold base 2. The sprue 11 can be connected to the cavity structure, and the steel plate 4 can be located inside the cavity structure. Molten plastic can be poured into the sprue 11 of the upper mold base 1 by the injection molding machine to integrally form the pallet box door panel 9 inside the cavity structure. The formed pallet box door panel 9 has an integrally formed steel plate 4 inside. Compared with the method of installing steel pipe by setting a steel pipe core-pulling structure, it can save the time of core pulling and steel pipe installation, improve production efficiency, and save labor costs.

[0057] like Figure 2 , Figure 3 and Figure 10 As shown, in some embodiments, one side of the insert 3 is provided with a plurality of protrusions 33, and the plurality of protrusions 33 are arranged in a row at intervals along a first direction, and the multiple rows of protrusions 33 are arranged in a column at intervals along a second direction. The first direction and the second direction are intersected. When the upper mold base 1 and the lower mold base 2 are closed, the gap between the plurality of protrusions 33 and the gap between the upper mold base 1 and the plurality of protrusions 33 form the cavity structure.

[0058] Specifically, each insert 3 may include an insert body and multiple protrusions 33. The outer contour shape and size of the insert body are adapted to the inner contour shape and size of the mounting groove 21, so that the insert body can be installed in the mounting groove 21, and the shape of the insert body can be made according to the corresponding mounting groove 21.

[0059] Multiple protrusions 33 can be disposed on the upper surface of the insert body, or in other words, multiple protrusions 33 are provided on the side of the insert body facing the upper mold base 1. These multiple protrusions 33 can be arranged in a row at intervals along a first direction, and multiple rows of protrusions 33 can be arranged in a column at intervals along a second direction. The first and second directions intersect, and preferably, the first and second directions are perpendicular to each other. Figure 2 The direction of the X-axis is the first direction, and the direction of the Y-axis is the second direction.

[0060] The insert body can be installed in the assembly slot 21, and the side of the insert body with multiple protrusions 33 faces the upper mold base 1. When the upper mold base 1 and the lower mold base 2 are closed, a cavity structure can be formed between the upper mold base 1 and the lower mold base 2. More specifically, the gaps between the multiple protrusions 33 and the gaps between the upper mold base 1 and the multiple protrusions 33 are all part of the cavity structure. During injection molding, the molten plastic can flow into the gaps between the multiple protrusions 33 and the gaps between the upper mold base 1 and the multiple protrusions 33 to form the pallet box door panel 9, so that multiple reinforcing rib-like structures are formed on the pallet box door panel 9, which can increase the structural strength of the pallet box door panel 9.

[0061] like Figure 2 and Figure 3 As shown, in some embodiments, multiple protrusions 33 located in the same row are recessed in a direction away from the upper mold base 1 to form a placement plane 34. The multiple placement planes 34 are coplanarly arranged to form the mounting position. The placement plane 34 is provided with the boss 31 and the positioning pin 32.

[0062] Specifically, in this embodiment, multiple protrusions 33 located in the same row can be recessed in the direction away from the upper mold base 1 to form a placement plane 34. Multiple placement planes 34 can be arranged coplanarly, and multiple placement planes 34 can form an installation position for placing the steel plate 4. The placement plane 34 is a square plane, and the three sides of the placement plane 34 coincide with the three sides of the protrusions 33 respectively. The placement plane 34 can be provided with a boss 31 and a positioning pin 32. When the steel plate 4 is placed on the placement plane 34, the positioning pin 32 can be inserted into the positioning hole 41, and the steel plate 4 can contact the boss 31, which can facilitate the installation of the steel plate 4.

[0063] In other embodiments, among the multiple rows of protrusions 33, one row of protrusions 33 can be used to install the steel plate 4. Multiple protrusions 33 in the same row can be recessed in a direction away from the upper mold base 1 to form installation grooves. Along the first direction, multiple installation grooves can be connected sequentially. Alternatively, among the three protrusions 33 arranged sequentially along the first direction, the opposite ends of the installation groove on the middle protrusion 33 can be connected to the installation grooves on the other two protrusions 33 respectively, so that multiple installation grooves are connected sequentially. These sequentially connected installation grooves can form a longer installation groove structure, which is the installation position for the steel plate 4. Each installation groove has a boss 31 and a positioning pin 32 at its bottom.

[0064] The width of the steel plate 4 can be adapted to the width of the mounting groove. When the steel plate 4 is placed in the mounting position, the two long sides of the steel plate 4 can contact the two side walls of the mounting groove respectively, thereby preventing the steel plate 4 from moving in the second direction during pouring. In addition, multiple positioning pins 32 can be inserted into multiple positioning holes 41, thereby preventing the steel plate 4 from moving in the first direction during pouring, so that the steel plate 4 can be firmly fixed in the mounting position.

[0065] like Figure 3 and Figure 9 As shown, in some embodiments, the steel plate 4 includes a first straight plate 42 and a second straight plate 43 that are arranged intersectingly. The first straight plate 42 is provided with a plurality of positioning holes 41. When the steel plate 4 is placed in the mounting position, the first straight plate 42 contacts the boss 31 on the placement plane 34, and the positioning pin 32 is inserted into the positioning hole 41. The second straight plate 43 is inserted into the gap between two adjacent rows of bosses 33.

[0066] Specifically, the steel plate 4 may include a first straight plate 42 and a second straight plate 43 that are arranged intersectingly. Preferably, the first straight plate 42 and the second straight plate 43 are arranged perpendicular to each other. Alternatively, the steel plate 4 can be described as an L-shaped plate. The first straight plate 42 may be provided with a plurality of positioning holes 41, which are arranged alternately. When the steel plate 4 is placed on the mounting position, the first straight plate 42 is arranged parallel to a plurality of placement planes 34, and the first straight plate 42 can contact the protrusions 31 on the placement planes 34. The positioning pins 32 can be inserted into the corresponding positioning holes 41. The second straight plate 43 can be inserted into the gap between two adjacent rows of protrusions 33. During injection molding, the first straight plate 42 and the second straight plate 43 can be wrapped by the molten plastic, so that the first straight plate 42 and the second straight plate 43 can be installed in the molded pallet box door panel 9, which can increase the structural strength of the pallet box door panel 9.

[0067] like Figure 2 and Figure 6As shown, in some embodiments, the integrated injection molding mold for the card box door panel further includes a limiting platform 5. The limiting platform 5 is disposed on the side wall of the protrusion 33 and is located in the gap between two adjacent rows of protrusions 33. When the second straight plate 43 is inserted into the gap between two adjacent rows of protrusions 33, the limiting platform 5 abuts against the side surface of the second straight plate 43 facing away from the first straight plate 42.

[0068] Specifically, the integrated injection molding mold for the pallet box door panel may also include a limiting platform 5. The limiting platform 5 may be disposed on the side wall of the protrusion 33 and may be located in the gap between two adjacent rows of protrusions 33. In this embodiment, the limiting platform 5 includes two mutually perpendicular first contact surfaces and second contact surfaces. When the second straight plate 43 is inserted into the gap between two adjacent rows of protrusions 33, one side of the second straight plate 43 may abut against the first contact surface, and one side of the second straight plate 43 may abut against the second contact surface, which can restrict the movement of the second straight plate 43, so that the second straight plate 43 can be firmly located in the gap between two adjacent rows of protrusions 33, and can also prevent the second straight plate 43 from shaking during pressure injection molding, so that the second straight plate 43 can be better molded inside the pallet box door panel 9.

[0069] like Figure 8 As shown, in some embodiments, the insert 3 has a main cooling channel 36 and a plurality of sub-cooling channels 37 inside. The plurality of sub-cooling channels 37 are respectively connected to the main cooling channel 36, and one end of each sub-cooling channel 37 extends to communicate with the outside of the insert 3, and the other end of each sub-cooling channel 37 extends into the interior of the protrusion 33. The lower mold base 2 is provided with a water inlet hole 22 and a water outlet hole 23. The water inlet hole 22 extends to communicate with one of the sub-cooling channels 37, and the water outlet hole 23 extends to communicate with another sub-cooling channel 37.

[0070] Specifically, the insert 3 may have a main cooling channel 36 and multiple cooling sub-channels 37 inside. In this embodiment, the main cooling channel 36 is arranged horizontally inside the insert 3, and the multiple cooling sub-channels 37 are arranged vertically at intervals inside the insert 3. The multiple cooling sub-channels 37 are connected to the main cooling channel 36 respectively. In other words, each cooling sub-channel 37 intersects with the main cooling channel 36. One end of each cooling sub-channel 37 extends to communicate with the outside of the insert 3, and the other end of each cooling sub-channel 37 extends into the inside of the protrusion 33.

[0071] The lower mold base 2 may be provided with a water inlet hole 22 and a water outlet hole 23. When the insert 3 is assembled on the lower mold base 2, the water inlet hole 22 can extend to communicate with one cooling sub-channel 37, and the water outlet hole 23 can extend to communicate with another cooling sub-channel 37. After the molten plastic is formed in the cavity structure, cooling water can be injected into the water inlet hole 22. The cooling water can flow through multiple cooling sub-channels 37 in sequence and flow to one end of each cooling sub-channel 37 located inside the protrusion 33. This can cool the formed cardboard box door panel 9, which can facilitate subsequent demolding and speed up production efficiency.

[0072] like Figure 7 and Figure 10 As shown, in some embodiments, the boss 31 is provided with a threaded hole 35, and the positioning pin 32 includes a positioning part 321 and a connecting part 322 connected end to end. The diameter of the positioning part 321 is larger than the diameter of the threaded hole 35, and the diameter of the connecting part 322 is adapted to the diameter of the threaded hole 35. The circumferential sidewall of the connecting part 322 is provided with a threaded structure.

[0073] When the steel plate 4 needs to be installed inside the door panel 9 of the pallet box, the connecting part 322 is inserted into the threaded hole 35 and connected to the threaded hole 35 through the threaded structure so that the positioning part 321 and the boss 31 are in contact.

[0074] When it is necessary to manufacture the card box door panel 9 made of pure plastic, the positioning pin 32 is removed from the threaded hole 35, and the bolt is threaded into the threaded hole 35.

[0075] Specifically, the end face of the boss 31 may be provided with a threaded hole 35, and the positioning pin 32 may include a positioning part 321 and a connecting part 322 connected end to end. In this embodiment, the diameter of the positioning part 321 may be larger than the diameter of the threaded hole 35, and the diameter of the connecting part 322 may be adapted to the diameter of the threaded hole 35, so that the connecting part 322 can be inserted into the threaded hole 35. The circumferential sidewall of the connecting part 322 may be provided with a threaded structure, and the connecting part 322 may be threadedly connected to the threaded hole 35.

[0076] When it is necessary to install the steel plate 4 inside the door panel 9 of the pallet box, the connecting part 322 can be inserted into the threaded hole 35, and the positioning part 321 can be turned to connect the connecting part 322 and the threaded hole 35 together, that is, the positioning pin 32 can be installed on the insert 3. In this embodiment, when the connecting part 322 is fully inserted into the threaded hole 35, the positioning part 321 can contact the end face of the boss 31, so that the steel plate 4 can be placed on the insert 3, and the positioning pin 32 and the positioning hole 41 on the steel plate 4 can be assembled to fix the steel plate 4 on the insert 3.

[0077] When it is necessary to manufacture a pure plastic pallet box door panel 9, the positioning pin 32 can be removed from the threaded hole 35, and the bolt can be connected into the threaded hole 35 to close the threaded hole 35. At this time, there is no need to place the steel plate 4 on the insert 3, so that the mold can have two states: the one-piece molding state of the steel plate 4 and the pure plastic injection molding state. It can switch between the two states according to production needs, and multiple products can be produced by one mold, reducing production costs.

[0078] like Figure 5 and Figure 6 As shown, in some embodiments, the upper mold base 1 is provided with a plurality of first support protrusions 6 on the side facing the lower mold base 2, and the plurality of first support protrusions 6 are arranged in sequence at intervals. The insert 3 with the boss 31 is provided with a plurality of second support protrusions 7, and the plurality of second support protrusions 7 are arranged in sequence at intervals. When the upper mold base 1 and the lower mold base 2 are closed, the plurality of first support protrusions 6 and the plurality of second support protrusions 7 respectively abut against the opposite sides of the steel plate 4.

[0079] Specifically, the upper mold base 1 may be provided with a plurality of first support protrusions 6 on the side facing the lower mold base 2. The plurality of first support protrusions 6 are arranged in sequence at intervals. The insert 3 with the boss 31 may be provided with a plurality of second support protrusions 7, and the plurality of second support protrusions 7 may also be arranged in sequence at intervals. In this embodiment, the plurality of first support protrusions 6 and the plurality of second support protrusions 7 may be arranged in a one-to-one correspondence.

[0080] When the upper mold base 1 and the lower mold base 2 are closed, multiple first support protrusions 6 and multiple second support protrusions 7 can respectively abut against the opposite sides of the steel plate 4, that is, the steel plate 4 can be set between the first support protrusions 6 and the second support protrusions 7. Both the first support protrusions 6 and the second support protrusions 7 can play the role of supporting the steel plate 4. During injection molding, high pressure needs to be applied to the cavity structure, and the first support protrusions 6 and the second support protrusions 7 can prevent the steel plate 4 from deforming.

[0081] like Figure 2 As shown, in some embodiments, the mounting position is further provided with a plurality of magnets 8, which are used to attract the steel plate 4.

[0082] Specifically, the mounting position can also be equipped with multiple magnets 8, which can attract the steel plate 4. When the steel plate 4 is placed on the mounting position, the magnets 8 can attract the steel plate 4, so that the positioning hole 41 on the steel plate 4 can be quickly assembled with the positioning pin 32, which can speed up the installation efficiency of the steel plate 4. In addition, the magnets 8 can also firmly attract the steel plate 4, making the steel plate 4 more securely installed.

[0083] On the other hand, such as Figure 11As shown, a method for integral injection molding of pallet box door panels, which uses the integral injection molding mold for pallet box door panels as described above, includes the following steps:

[0084] S1. Insert the connecting parts 322 of the multiple positioning pins 32 into the multiple threaded holes 35 on the insert 3 respectively, and tighten the connecting parts 322 so that the positioning part 321 of the positioning pin 32 contacts the boss 31 on the insert 3.

[0085] S2. Install multiple inserts 3 into multiple mounting slots on the lower mold base 2, and make multiple cooling sub-channels 37 on the inserts 3 communicate with the water inlet hole 22 and the outlet hole on the lower mold base 2, respectively.

[0086] S3. The robot places the steel plate 4 on the installation position so that the positioning parts 321 of the multiple positioning pins 32 are respectively inserted into the multiple positioning holes 41 of the steel plate 4.

[0087] S4. The upper mold base 1 and the lower mold base 2 are closed to form a cavity structure between the upper mold base 1 and the plurality of inserts 3;

[0088] S5. Molten plastic is poured into the sprue 11 of the upper mold base 1 by injection molding machine to integrally form the card box door panel 9 in the cavity structure.

[0089] S6. After the pouring is completed, wait for a predetermined time and inject cooling water into the water inlet 22 so that the cooling water flows in the cooling sub-channel 37 and the cooling main channel 36 of the insert 3.

[0090] Specifically, in step S1, depending on the characteristics of the product to be produced, it can be selected whether to install the positioning pin 32 on the threaded hole 35. When it is necessary to install the steel plate 4 inside the card box door panel 9, the connecting parts 322 of the multiple positioning pins 32 can be inserted into the multiple threaded holes 35 on the insert 3 respectively, and the connecting parts 322 can be tightened so that the positioning part 321 of the positioning pin 32 contacts the boss 31 on the insert 3, and the positioning part 321 protrudes from the boss 31 on the insert 3, thereby facilitating the assembly of the positioning hole 41 on the steel plate 4 and the positioning part 321.

[0091] In step S2, multiple inserts 3 can be installed in multiple mounting slots on the lower mold base 2, and multiple cooling sub-channels 37 on the inserts 3 can be connected to the water inlet hole 22 and the outlet hole on the lower mold base 2, so as to facilitate the cooling treatment of the inserts 3.

[0092] In step S3, the steel plate 4 can be placed on the mounting position by a robot, so that the positioning parts 321 of the multiple positioning pins 32 are respectively inserted into the multiple positioning holes 41 on the steel plate 4. The robot can realize automated production and improve production efficiency.

[0093] In step S4, the upper mold base 1 and the lower mold base 2 can be closed to form a cavity structure between the upper mold base 1 and multiple inserts 3, and the steel plate 4 is located inside the cavity structure.

[0094] In step S5, molten plastic can be poured into the sprue 11 of the upper mold base 1 by injection molding machine to integrally form the pallet box door panel 9 in the cavity structure. In this embodiment, a needle valve type hot runner can be used to inject the glue into the sprue 11, and the glue can be sealed by the needle of the hot runner, so that there is no material stalk on the surface of the product, the glue injection point is beautiful and smooth, and a steel plate 4 can be integrally formed inside the pallet box door panel 9, so that the pallet box door panel 9 has high structural strength.

[0095] In step S6, after injection molding, a predetermined time can be waited for the molten plastic to cool and solidify. Then, cooling water can be injected into the inlet. The cooling water can flow through multiple cooling sub-channels 37 in sequence and flow to one end of each cooling sub-channel 37 located inside the protrusion 33. This can cool the molded cardboard box door panel 9, which can facilitate subsequent demolding and speed up production efficiency.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A type of injection molding mold for an integrated pallet box door panel, characterized in that: It includes an upper mold base (1) and a lower mold base (2) arranged opposite to each other, and multiple inserts (3); The upper mold base (1) has a plurality of pouring ports (11) on the surface facing away from the lower mold base (2), and the pouring ports (11) penetrate the upper mold base (1). The lower mold base (2) is provided with a plurality of assembly slots (21) on the side facing the upper mold base (1), and each assembly slot (21) is used for the installation of the corresponding insert (3); At least one of the inserts (3) is provided with a mounting position for placing a steel plate (4), the steel plate (4) is provided with a plurality of positioning holes (41), the mounting position is provided with a plurality of bosses (31) spaced apart, each boss (31) is provided with a positioning pin (32), each positioning pin (32) is inserted into a corresponding positioning hole (41) so that the steel plate (4) is fixed on the corresponding insert (3); When the upper mold base (1) and the lower mold base (2) are closed, a cavity structure is formed between the upper mold base (1) and the plurality of inserts (3), the pouring gate (11) is connected to the cavity structure, and the steel plate (4) is located inside the cavity structure; The boss (31) is provided with a threaded hole (35). The positioning pin (32) includes a positioning part (321) and a connecting part (322) connected end to end. The diameter of the positioning part (321) is larger than the diameter of the threaded hole (35), and the diameter of the connecting part (322) is adapted to the diameter of the threaded hole (35). The circumferential sidewall of the connecting part (322) is provided with a threaded structure. When it is necessary to install the steel plate (4) inside the pallet box door panel (9), the connecting part (322) is inserted into the threaded hole (35) and connected to the threaded hole (35) through the threaded structure so that the positioning part (321) and the boss (31) come into contact; When it is necessary to manufacture the card box door panel (9) made of pure plastic, the positioning pin (32) is removed from the threaded hole (35) and the bolt is threaded into the threaded hole (35); The upper mold base (1) has a plurality of first support protrusions (6) on its side facing the lower mold base (2). The plurality of first support protrusions (6) are arranged in sequence at intervals. The insert (3) with the boss (31) has a plurality of second support protrusions (7). The plurality of second support protrusions (7) are arranged in sequence at intervals. When the upper mold base (1) and the lower mold base (2) are closed, the plurality of first support protrusions (6) and the plurality of second support protrusions (7) respectively abut against the opposite sides of the steel plate (4).

2. The integrated injection molding mold for pallet box door panel as described in claim 1, characterized in that: The insert (3) has a plurality of protrusions (33) on one side, and the plurality of protrusions (33) are arranged in a row at intervals along a first direction, and the multiple rows of protrusions (33) are arranged in a column at intervals along a second direction. The first direction and the second direction are intersected. When the upper mold base (1) and the lower mold base (2) are closed, the gap between the plurality of protrusions (33) and the gap between the upper mold base (1) and the plurality of protrusions (33) form the cavity structure.

3. The integrated injection molding mold for pallet box door panel as described in claim 2, characterized in that: The multiple protrusions (33) located in the same row are recessed in the direction away from the upper mold base (1) to form a placement plane (34). The multiple placement planes (34) are coplanar and form the mounting position. The placement plane (34) is provided with the boss (31) and the positioning pin (32).

4. The integrated injection molding mold for pallet box door panel as described in claim 3, characterized in that: The steel plate (4) includes a first straight plate (42) and a second straight plate (43) that are arranged intersectingly. The first straight plate (42) is provided with a plurality of positioning holes (41). When the steel plate (4) is placed in the mounting position, the first straight plate (42) contacts the boss (31) on the placement plane (34), and the positioning pin (32) is inserted into the positioning hole (41). The second straight plate (43) is inserted into the gap between two adjacent rows of protrusions (33).

5. The integrated injection molding mold for pallet box door panel as described in claim 4, characterized in that: It also includes a limiting platform (5), which is disposed on the side wall of the protrusion (33) and is located in the gap between two adjacent rows of protrusions (33). When the second straight plate (43) is inserted in the gap between two adjacent rows of protrusions (33), the limiting platform (5) abuts against the side of the second straight plate (43) facing away from the first straight plate (42).

6. The integrated injection molding mold for pallet box door panel as described in claim 2, characterized in that: The insert (3) has a main cooling channel (36) and multiple cooling sub-channels (37) inside. The multiple cooling sub-channels (37) are respectively connected to the main cooling channel (36), and one end of each cooling sub-channel (37) extends to communicate with the outside of the insert (3), and the other end of each cooling sub-channel (37) extends to the inside of the protrusion (33). The lower mold base (2) is provided with a water inlet hole (22) and a water outlet hole (23). The water inlet hole (22) extends to communicate with one of the cooling sub-channels (37), and the water outlet hole (23) extends to communicate with another cooling sub-channel (37).

7. The integrated injection molding mold for pallet box door panel as described in claim 1, characterized in that: The mounting position is also provided with a plurality of magnets (8), which are used to attract the steel plate (4).

8. A method for integral injection molding of pallet box door panels, characterized in that: The method of using the integrated injection molding mold for pallet box door panels as described in any one of claims 1-7 includes the following steps: S1. Insert the connecting parts (322) of the multiple positioning pins (32) into the multiple threaded holes (35) on the insert (3) respectively, and tighten the connecting parts (322) so that the positioning part (321) of the positioning pin (32) and the boss (31) on the insert (3) come into contact. S2. Install the multiple inserts (3) into the multiple mounting slots on the lower mold base (2), and make the multiple cooling sub-channels (37) on the inserts (3) communicate with the water inlet (22) and the outlet hole on the lower mold base (2); S3. The steel plate (4) is placed on the installation position by the robot so that the positioning parts (321) of the multiple positioning pins (32) are respectively inserted into the multiple positioning holes (41) of the steel plate (4); S4. The upper mold base (1) and the lower mold base (2) are closed to form a cavity structure between the upper mold base (1) and the plurality of inserts (3); S5. Molten plastic is poured into the sprue (11) of the upper mold base (1) by injection molding machine to integrally form the card box door panel (9) in the cavity structure. S6. After the pouring is completed, wait for a predetermined time and inject cooling water into the water inlet (22) so that the cooling water flows in the cooling sub-channel (37) and cooling main channel (36) of the insert (3).

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