Foldable pet ladder forming mold based on hollow blow molding technology

Abstract

The application discloses a foldable pet ladder forming die based on hollow blow molding technology and relates to the technical field of blow molding equipment.The foldable pet ladder forming die comprises an upper die, a lower die, a left die and a right die.The foldable pet ladder forming die can pre-inject the connecting part of one component and another component of the foldable pet ladder, so that the connecting part of one component and another component of the foldable pet ladder is a solid body, the mechanical strength of the foldable pet ladder is improved, and the foldable pet ladder forming die can also produce a rectangular pipe blank with a plurality of vertical ribs on the inner surface and a rectangular pipe blank with a smooth inner surface according to requirements, so that the blow molding piece of the foldable pet ladder has higher strength;the top of the foldable pet ladder component is provided with a desired component, the defect of surface depression of the foldable pet ladder component caused by insufficient air pressure due to the pre-bleeding of the traditional process is reduced, the top of the foldable pet ladder component is provided with a desired component, and the compressed gas that can be reserved provides support for the hollow structure of the foldable pet ladder component.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blow molding equipment, more particularly to a foldable pet ladder forming mold based on hollow blow molding technology. BACKGROUND

[0002] With the increase of pet raising rate, the demand for pet life auxiliary products continues to grow. The foldable pet ladder, which can help old, small or disabled pets to get on and off furniture such as beds and sofas, and has the convenience of storage, has become one of the mainstream products. At present, the core components of the foldable pet ladder shown in the figure are mostly produced by hollow blow molding process. This process is widely used in the field of plastic part manufacturing because it can achieve lightweight, integrated molding and lower cost. Figure 1

[0003] However, the existing foldable pet ladder forming mold and process based on hollow blow molding technology still has the following technical problems in actual production:

[0004] Poor adaptability of tube parison shape to subsequent blow molding: traditional molds mostly use circular tube parison feeding structure, while the components of the foldable pet ladder are mostly non-circular cross section. When the circular tube parison is blow molded into the mold cavity, the cross section is prone to uneven deformation, resulting in excessive local wall thickness deviation of the component, insufficient mechanical strength of the weak part, and difficulty in bearing the pressure of pet stepping. Long-term use may cause cracking and deformation problems.

[0005] Insufficient strength of component connection part: the folding function of the foldable pet ladder depends on the cooperation of each ladder step and the connecting shaft. The connecting part must have high rigidity to ensure the stability of folding. In the existing process, the connecting part is often blow molded simultaneously with the main body of the ladder step, resulting in a hollow structure in this area, which makes it difficult to meet the use requirements.

[0006] Unreasonable gas pressure control in blow molding process: in the traditional blow molding process, the tube parison needs to be punctured to release gas before the mold is closed. This operation not only increases the process steps and causes gas waste, but also leads to insufficient internal gas pressure of the component when the mold is closed, which cannot tightly fit the cavity, and is prone to form defects such as surface depression and corner material shortage. At the same time, in order to make up for the strength problem caused by insufficient gas pressure, the thickness of the tube wall needs to be increased, resulting in material waste and product weight increase, which violates the lightweight design requirement.

[0007] Low flexibility of product strength adjustment: different weights and breeds of pets have different mechanical strength requirements for pet ladders. However, the cavity structure of the existing mold is fixed, and only components of a single strength specification can be produced. If the strength needs to be adjusted, the mold needs to be redesigned and manufactured, which prolongs the production cycle and increases the cost, making it difficult to meet the diversified market demand.

[0008] ​In view of the above, we propose a hollow blow molding technology-based foldable pet ladder forming mold. SUMMARY

[0009] The present application aims to provide a hollow blow molding technology-based foldable pet ladder forming mold to solve the above technical problems.

[0010] To solve the above technical problems, the present application provides the following technical solution: a hollow blow molding technology-based foldable pet ladder forming mold, comprising an upper mold, a lower mold, a left mold, and a right mold;

[0011] The upper mold comprises a mounting seat, a heating block is arranged on the mounting seat, a rectangular groove is formed at the bottom end of the heating block, a rectangular block assembly is arranged in the rectangular groove, and a rectangular cavity is formed between the rectangular block assembly and the rectangular groove; the rectangular block assembly comprises a rectangular block, the rectangular block is arranged in the rectangular groove, a plurality of vertical grooves A are formed at the axial ends of the rectangular block, a vertical bar A is slidably arranged in the vertical grooves A, a plurality of vertical grooves B are formed at the radial ends of the rectangular block, and a vertical bar B is slidably arranged in the vertical grooves B; the lower mold is provided with an injection cavity A at the top end, which is in communication with the rectangular cavity; the left mold is provided with a plastic cavity B; the right mold is provided with a plastic cavity C; the top ends of the left mold and the right mold are provided with a sliding groove Z, a plurality of spring holes are formed in the sliding groove Z, a sliding seat is slidably arranged in the sliding groove Z, the proximal ends of the two sliding seats are wavy, a cutter is fixedly arranged at the top end of the sliding seat, and the sliding seat and the corresponding plurality of spring holes are elastically connected by a spring C.

[0012] When the vertical bars A and B are respectively at the eccentric ends of the vertical grooves A and B, the plurality of vertical bars A and the plurality of vertical bars B form a rectangular structure with the rectangular block, and when the vertical bars A and B are respectively at positions other than the eccentric ends of the vertical grooves A and B, the vertical bars A and B form new concave channel A and concave channel B with the vertical grooves A and B, respectively. The plastic melt falls from the rectangular cavity, forming a rectangular tube parison with a plurality of vertical protrusions on the inner surface, so that the blow molding piece of the foldable pet ladder has higher strength, and the larger the concave channel A and the concave channel B, the larger the vertical protrusions formed. The strength of the blow molding piece of the foldable pet ladder can be adjusted, and different strength foldable pet ladders can be made under the premise of saving plastic.

[0013] And, the plastic molten liquid falls from the rectangular tube cavity to form a rectangular tube parison, which reduces the deformation of the tube parison during subsequent blow molding compared with a traditional round tube parison;

[0014] When the left mold is relatively close to the right mold, the two sliding seats first contact to extrude the top end of the rectangular tube parison, so that both ends of the rectangular tube parison are closed, until the left mold contacts the right mold, the plastic cavity B and the plastic cavity C are closed to press the rectangular tube parison into the foldable pet ladder component with excess material at the top, which reduces plastic loss and manual post-processing workload compared with the traditional process in which there is excess material on the periphery. In this process, compared with the traditional blow molding process, the process of the present application utilizes the gas compression of the rectangular tube parison when the plastic cavity B and the plastic cavity C are closed, and the sustained internal pressure formed by the compressed gas quickly disperses stress to assist the shape change of the rectangular tube parison. Compared with the traditional method of cutting the tube parison to release gas before the left mold contacts the right mold, not only is the process step reduced, but also the internal gas pressure of the foldable pet ladder component when the plastic cavity B and the plastic cavity C are closed is ensured, the contact between the foldable pet ladder component and the plastic cavity B and the plastic cavity C is ensured, the surface depression defect of the foldable pet ladder component caused by insufficient gas pressure due to early release of gas in the traditional process is reduced, and the remaining compressed gas is equivalent to injecting dynamic support force into the hollow structure of the foldable pet ladder component. The internal pressure can enhance the overall stability of the structure, compensate for the reduction in material thickness, reduce the wall thickness to achieve lightweight, and still maintain or even exceed the rigidity of thick-walled structures without internal pressure.

[0015] Preferably, a mounting cavity is formed at the bottom end of the mounting seat, and a circular cavity is formed at the top end of the mounting cavity.

[0016] Preferably, the heating block is fixedly arranged in the mounting cavity.

[0017] A pre-storage groove is formed at the top end of the rectangular groove, the pre-storage groove has a four-trapezoidal structure with a large upper part and a small lower part, a circular groove is formed at the top end of the heating block, and the circular groove and the pre-storage groove are connected through an adaptive groove.

[0018] Preferably, the upper mold further comprises a material guiding assembly, the material guiding assembly comprises a circular table block arranged in the circular groove and an adaptive block arranged in the adaptive groove, the circular table block is fixedly connected with the circular groove through a plurality of connecting plates arranged in a ring-shaped equidistant structure, the top end of the adaptive block is fixedly connected with the bottom end of the circular table block, and the adaptive block and the adaptive groove form a material inlet channel through a gap.

[0019] Preferably, the material guiding assembly further comprises a material guiding unit, the material guiding unit comprises a ring pipe, a heating pipe, a chain wheel A, a chain wheel B and a motor, the ring pipe is rotatably arranged on the circular block, the top end of the ring pipe penetrates through the mounting seat and is rotatably arranged with a joint, the heating pipe is fixedly arranged on the circular cavity, a feeding pipe penetrating through the mounting seat is communicatively arranged on the heating pipe, a threaded plate fixedly connected with the ring pipe is arranged in the heating pipe, the chain wheel A is fixedly arranged on the ring pipe, the chain wheel B is arranged above the mounting seat in the position opposite to the mounting groove, the chain wheel A and the chain wheel B are drivingly connected through a chain, the chain wheel B is rotatably connected with the mounting seat through a rotating shaft, the motor is fixedly arranged on the mounting groove, the bottom end of the rotating shaft penetrates into the mounting groove and is fixedly connected with the output shaft of the motor.

[0020] Preferably, the top end of the rectangular block is fixedly connected with the bottom end of the adaptive block through a connecting block, a plurality of vertical grooves A are connected in communication through a sliding groove A, a sliding plate A fixedly connected with a plurality of vertical strips A is slidingly arranged on the sliding groove A, a plurality of vertical grooves B are connected in communication through a sliding groove B, a sliding plate B fixedly connected with a plurality of vertical strips B is slidingly arranged on the sliding groove B.

[0021] Preferably, the middle part of the rectangular block is provided with an empty slot in communication with the two sliding grooves A, the sliding groove B is in communication with the empty slot through a sliding groove X.

[0022] Preferably, the upper mold further comprises an adjusting assembly, the adjusting assembly comprises a square column, the corner of the square column is provided with a rounded corner, the surface of the square column is provided with a movable groove, four movable columns are movably arranged on the movable groove, two of the movable columns are fixedly provided with a connecting plate A, the connecting plate A is fixedly connected with the sliding plate A, the other two movable columns are fixedly provided with a connecting plate B, the connecting plate B is fixedly connected with the sliding plate B, the both ends of the square column are fixedly provided with a ring block rotatably connected with the rectangular block, and a gas hole in communication with the ring block is arranged on the square column.

[0023] Preferably, the bottom end of the connecting block is provided with a rotating groove, a bearing assembly is arranged on the rotating groove, the bearing assembly comprises a rotating ring A rotatably arranged on the rotating groove, the bottom end of the rotating ring A is fixedly connected with the ring block above, a plurality of triangular grooves A are arranged on the outer edge surface of the rotating ring A, a lock column A is movably arranged on the triangular groove A, the lock column A is elastically connected with the triangular groove A through a spring A, a rotating ring B is rotatably connected with the rotating ring A, the top end of the rotating ring B penetrates into the circular block and is fixedly connected with the bottom end of the ring pipe, a plurality of triangular grooves B are arranged on the outer edge surface of the rotating ring B, a lock column B is movably arranged on the triangular groove B, the lock column B is elastically connected with the triangular groove B through a spring B.

[0024] Preferably, the plastic cavity B is provided with a sliding bar on both sides, the sliding bar is matched with the shape of the plastic cavity B, and the plastic cavity C is provided with a sliding groove Y on both sides, and the sliding groove Y is matched with the sliding bar in sliding mode.

[0025] The beneficial effects of the present application are:

[0026] 1、The structure design of the upper mold, the lower mold, the left mold and the right mold makes the rectangular tube cavity of the injection cavity A communicate, so that the plastic melt enters the injection cavity A, and the connecting part of one component and another component of the pre-injection molded foldable pet ladder is used, so that the connecting part of one component and another component of the foldable pet ladder is solid, and the mechanical strength is improved.

[0027] When the vertical bars A and B are respectively at the eccentric ends of the vertical grooves A and B, the vertical bars A and B and the rectangular block constitute a flat rectangular structure, when the vertical bars A and B are respectively at positions other than the eccentric ends of the vertical grooves A and B, the vertical bars A and B and the vertical grooves A and B constitute new concave edge channels A and B, the plastic melt falls from the rectangular tube cavity, forms a rectangular tube parison with a plurality of vertical convex edges on the inner surface, so that the blow molding part of the foldable pet ladder has higher strength, and the larger the concave edge channels A and B, the larger the vertical convex edges formed, the strength of the blow molding part of the foldable pet ladder can be adjusted, different strength foldable pet ladders can be made under the premise of saving plastic;

[0028] Moreover, the plastic melt falls from the rectangular tube cavity to form a rectangular tube parison, which reduces the deformation of the tube parison during subsequent blow molding compared with traditional circular tube parisons.

[0029] When the left mold and the right mold are relatively close, the two sliding seats first contact and extrude the top end of the rectangular tube parison, so that the two ends of the rectangular tube parison are closed, until the left mold and the right mold contact, and the plastic cavity B and the plastic cavity C are closed to press the rectangular tube parison into the foldable pet ladder component with excess material at the top. Compared with the traditional process in which the periphery has excess material, the plastic loss and the workload of manual post-processing are reduced. In this process, compared with the traditional blow molding process, the process of the present application utilizes the closing of the plastic cavity B and the plastic cavity C, the gas compression of the rectangular tube parison, and the continuous internal pressure formed by the compressed gas to quickly disperse stress and assist the shape change of the rectangular tube parison. Compared with the traditional method of cutting the tube parison to release gas before the left mold and the right mold contact, not only the process steps are reduced, the gas loss is reduced, but also the internal gas pressure of the foldable pet ladder component when the plastic cavity B and the plastic cavity C are closed is ensured, the contact between the foldable pet ladder component and the plastic cavity B and the plastic cavity C is ensured, the surface depression defect of the foldable pet ladder component caused by insufficient gas pressure due to early gas release in the traditional process is reduced, and the remaining compressed gas is equivalent to injecting dynamic support force into the hollow structure of the foldable pet ladder component. The internal pressure can enhance the overall stability of the structure, compensate for the reduction in material thickness, reduce the pipe wall thickness to achieve lightweight, and still maintain or even exceed the rigidity of the thick-walled structure without internal pressure.

[0030] 2、The present application adjusts the structure of the assembly and the bearing assembly, so that when the ring tube rotates forward, the rotating ring B drives the rotating ring A to rotate forward as a whole, so that the ring block drives the square column to rotate, the square column drives the movable groove to rotate, so that the plurality of movable columns move synchronously, the connecting plate A drives the sliding plate A to slide on the sliding groove A, the connecting plate B drives the sliding plate B to slide on the sliding groove B, so that the plurality of vertical strips A and the plurality of vertical strips B slide simultaneously, the shape of the block assembly is adjusted, so that the rectangular tube parison with a smooth inner surface and the rectangular tube parison with a plurality of vertical ribs on the surface are made. When the ring tube rotates reversely, the rotating ring A does not rotate, so that the ring tube drives the threaded plate to rotate under the condition of the shape of the block assembly, and the rectangular tube parison is made. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure diagram of the foldable pet ladder of the present application;

[0032] Figure 2 It is a whole structure assembly diagram of the present application;

[0033] Figure 3 It is a structure diagram of the upper mold, the lower mold, the left mold and the right mold of the present application;

[0034] Figure 4 It is a structure diagram of the left mold and the right mold of the present application;

[0035] Figure 5 It is a partial structure diagram of the left mold and the right mold of the present application;

[0036] Figure 6 Structure diagram of the slide of the present application;

[0037] Figure 7 Structure diagram of the upper die of the present application;

[0038] Figure 8 Structure diagram of the mounting seat of the present application;

[0039] Figure 9 Structure diagram of the heating block and material guiding assembly of the present application;

[0040] Figure 10 Structure diagram of the upper die of the present application;

[0041] Figure 11 Structure diagram of the upper die of the present application;

[0042] Figure 12 Structure diagram of the mounting seat of the present application;

[0043] Figure 13 Structure diagram of the mounting seat of the present application;

[0044] Figure 14 Structure diagram of the mounting seat of the present application;

[0045] Figure 15 Structure diagram of the mounting seat of the present application; Figure 14 Structure diagram of the mounting seat of the present application;

[0046] Figure 16 Structure diagram of the mounting seat of the present application;

[0047] Figure 17 Structure diagram of the mounting seat of the present application;

[0048] Explanation of the reference numerals in the drawings:

[0049] 01, frame; 02, lifting mechanism; 03, translation mechanism; 04, molten material feeding mechanism;

[0050] 1, upper die; 2, lower die; 3, left die; 4, right die;

[0051] 11, mounting seat; 12, heating block; 13, material guiding assembly; 14, block assembly; 15, adjusting assembly; 16, bearing assembly;

[0052] 111, mounting cavity; 112, circular cavity; 113, mounting groove;

[0053] 121, rectangular slot; 122, pre-storage slot; 123, round slot; 124, adaptive slot;

[0054] 130, motor; 131, round block; 132, connecting plate; 133, adaptive block; 134, ring pipe; 135, joint; 136, heating pipe; 137, threaded plate; 138, chain wheel A; 139, chain wheel B;

[0055] 141, rectangular block; 142, connecting block;

[0056] 151, square column; 152, movable slot; 153, movable column; 154, connecting plate A; 155, connecting plate B; 156, ring block;

[0057] 161, rotating ring A; 162, triangular slot A; 163, locking column A; 164, spring A; 165, rotating ring B; 166, triangular slot B; 167, locking column B; 168, spring B;

[0058] 1410, sliding groove X; 1411, vertical slot A; 1412, vertical bar A; 1413, sliding groove A; 1414, sliding plate A; 1415, vertical slot B; 1416, vertical bar B; 1417, sliding groove B; 1418, sliding plate B; 1419, empty slot;

[0059] 1421, rotating slot;

[0060] 21, injection molding cavity A;

[0061] 31, plastic cavity B; 32, sliding bar;

[0062] 41, plastic cavity C; 42, sliding groove Y; 43, sliding groove Z; 44, sliding seat; 45, cutter; 46, spring C; 47, spring hole. DETAILED DESCRIPTION

[0063] As Figures 1 to 17 shown, the present application relates to a foldable pet ladder forming mold based on hollow blow molding technology, which comprises an upper mold 1, a lower mold 2, a left mold 3 and a right mold 4.

[0064] In the embodiment of the present application, as Figure 2As shown in the drawings, the upper mold 1, the lower mold 2, the left mold 3 and the right mold 4 are all arranged on the blow molding machine, specifically, the blow molding machine of the present application comprises a frame body 01, the upper mold 1 is fixedly arranged on the frame body 01 through a fixing seat, a lifting mechanism 02 is arranged in the frame body 01, the lower mold 2 is fixedly arranged on the movable end of the lifting mechanism 02, two translation mechanisms 03 are symmetrically arranged on the frame body 01 relative to the position of the lifting mechanism 02, the left mold 3 and the right mold 4 are respectively fixedly arranged on the movable ends of the two translation mechanisms 03, and a melting feeding mechanism 04 is fixedly arranged on one side of the top end of the frame body 01. The lifting mechanism 02, the translation mechanism 03 and the melting feeding mechanism 04 of the present application are all prior art in the field, and will not be repeated here, and the blow molding machine of the present application can be selected and matched according to the actual situation, and is not limited to the current structure arrangement.

[0065] In the embodiment of the present application, as shown in Figure 7 , Figure 10 and Figure 11 , the upper mold 1 comprises a mounting seat 11, a heating block 12, a material guiding assembly 13, a matrix block assembly 14 and an adjusting assembly 15.

[0066] In the embodiment of the present application, as shown in Figure 8 , an installation cavity 111 is formed at the bottom end of the mounting seat 11, a circular cavity 112 is formed at the top end of the installation cavity 111, and an installation groove 113 is formed at one side of the top of the mounting seat 11.

[0067] In the embodiment of the present application, as shown in Figure 7 and Figure 9 , the heating block 12 is fixedly arranged on the installation cavity 111, a rectangular groove 121 is formed at the bottom end of the heating block 12, a pre-storage groove 122 is formed at the top end of the rectangular groove 121, the pre-storage groove 122 has a four-prism-taip structure with the top larger than the bottom, a circular groove 123 is formed at the top end of the heating block 12, and the circular groove 123 and the pre-storage groove 122 are connected through an adaptive groove 124, as shown in Figure 9 , the adaptive groove 124 is a gradually changing structure with the top end being circular and the bottom end being rectangular.

[0068] In the embodiment of the present application, as shown in Figure 7 , Figure 9 , Figure 10 and Figure 11 , the material guiding assembly 13 comprises a circular table block 131 arranged in the circular groove 123 and an adaptive block 133 arranged in the adaptive groove 124, the circular table block 131 is fixedly connected with the circular groove 123 through a plurality of connecting plates 132 arranged in a ring-shaped equidistant structure, the top end of the adaptive block 133 is fixedly connected with the bottom end of the circular table block 131, and the adaptive block 133 and the adaptive groove 124 form a material inlet channel in a gap.

[0069] In the embodiment of the present application, as shown in Figure 7 , Figure 9 , Figure 10 andFigure 11 As shown, the material guiding assembly 13 further comprises a material guiding unit, which comprises a ring pipe 134, a heating pipe 136, a chain wheel A 138, a chain wheel B 139 and a motor 130. The ring pipe 134 is rotatably arranged on the circular block 131, the top end of the ring pipe 134 penetrates through the mounting seat 11 and is rotatably provided with a joint 135. The heating pipe 136 is fixedly arranged on the circular cavity 112, and a feeding pipe penetrating through the mounting seat 11 is communicatively arranged on the heating pipe 136. The feeding pipe is in communication with the molten material feeding mechanism 04. A threaded plate 137 fixedly connected with the ring pipe 134 is arranged in the heating pipe 136. The chain wheel A 138 is fixedly arranged on the ring pipe 134. The chain wheel B 139 is arranged above the mounting seat 11 opposite to the mounting groove 113. The chain wheel A 138 and the chain wheel B 139 are drivingly connected through a chain. The chain wheel B 139 is rotatably connected with the mounting seat 11 through a rotating shaft. The motor 130 is fixedly arranged on the mounting groove 113. The bottom end of the rotating shaft penetrates into the mounting groove 113 and is fixedly connected with the output shaft of the motor 130.

[0070] In the embodiment of the present application, as shown in Figure 7 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 17As shown, the rectangular block assembly 14 is arranged in the rectangular groove 121, the rectangular block assembly 14 and the rectangular groove 121 form a rectangular lumen with a gap, the rectangular block assembly 14 includes a rectangular block 141, the rectangular block 141 is arranged in the rectangular groove 121, the top end of the rectangular block 141 is fixedly connected with the bottom end of the adaptive block 133 through a connecting block 142, the axial both ends of the rectangular block 141 are arranged with a plurality of vertical grooves A1411 in an equal interval structure, a plurality of vertical grooves A1411 are connected in communication through a sliding groove A1413, the sliding groove A1413 is slidably provided with a sliding plate A1414 fixedly connected with a plurality of vertical grooves A1411, the radial both ends of the rectangular block 141 are arranged with a plurality of vertical grooves B1415 in an equal interval structure, the vertical grooves B1415 are slidably connected with a plurality of vertical grooves B1416, a plurality of vertical grooves B1415 are connected in communication through a sliding groove B1417, the sliding groove B1417 is slidably provided with a sliding plate B1418 fixedly connected with a plurality of vertical grooves B1416. Through the above arrangement, the joint 135 is communicated with the output end of the external gas feeding mechanism, in use, the output shaft of the motor 130 is controlled to rotate through the external control mechanism, the chain wheel B139 drives the chain wheel A138 to rotate through the chain, so that the ring pipe 134 drives the threaded plate 137 to rotate, so that the molten plastic feeding mechanism 04 sends the plastic molten liquid into the heating pipe 136, the plastic molten liquid in the pre-storage groove 122 enters from the top side of the pre-storage groove 122 through the inlet channel, the pressure of the plastic molten liquid in the pre-storage groove 122 is increased, so that the plastic molten liquid in the pre-storage groove 122 falls from the rectangular lumen, forming a rectangular pipe parison, compared with the traditional circular pipe parison, the deformation of the pipe parison during subsequent blow molding is reduced, and the structure design of the pre-storage groove 122 reduces the influence of the plastic molten liquid entering the pre-storage groove 122 on the downflow speed of the plastic molten liquid from the rectangular lumen, so that the thickness of each part of the foldable pet ladder part is relatively uniform, thereby further improving the mechanical strength of the blow molding part of the foldable pet ladder. And through the further design of the rectangular block assembly 14, such as Figure 17As shown, when the sliding plate A 1414 and the sliding plate B 1418 are respectively at the eccentric ends of the sliding groove A 1413 and the sliding groove B 1417, the vertical bars A 1412 and the vertical bars B 1416 are respectively at the eccentric ends of the vertical grooves A 1411 and the vertical grooves B 1415, so that the vertical bars A 1412 and the vertical bars B 1416 and the rectangular block 141 form a rectangular structure with a flat surface, and the plastic molten liquid falls from the rectangular cavity to form a rectangular tube parison with a flat inner surface. When the sliding plate A 1414 and the sliding plate B 1418 slide towards the centripetal ends of the sliding groove A 1413 and the sliding groove B 1417, the vertical bars A 1412 and the vertical bars B 1416 are respectively at positions other than the eccentric ends of the vertical grooves A 1411 and the vertical grooves B 1415, and the vertical bars A 1412 and the vertical bars B 1416 respectively form new concave channel A and concave channel B with the vertical grooves A 1411 and the vertical grooves B 1415, so that the plastic molten liquid falls from the rectangular cavity to form a rectangular tube parison with a plurality of vertical convex edges on the inner surface, so that the blow molding piece of the foldable pet ladder has higher strength, and the larger the concave channel A and the concave channel B, the larger the vertical convex edges formed, the strength of the blow molding piece of the foldable pet ladder can be adjusted, different strength foldable pet ladders can be made under the premise of saving plastic.

[0071] In an embodiment of the present application, as shown in Figure 12 、 Figure 13 and Figure 14 , the middle part of the rectangular block 141 is provided with an air slot 1419 communicated with the two sliding grooves A 1413, and the sliding groove B 1417 and the air slot 1419 are communicated through the sliding groove X 1410.

[0072] In an embodiment of the present application, as shown in Figure 11 、 Figure 12 、 Figure 14 and Figure 15As shown, the adjusting assembly 15 comprises a square column 151, the square column 151 is provided with rounded corners at corners, the square column 151 is provided with a movable slot 152 on the surface, four movable columns 153 are movably arranged on the movable slot 152, two movable columns 153 are fixedly provided with a connecting plate A 154, the connecting plate A 154 is fixedly connected with the sliding plate A 1414, the other two movable columns 153 are fixedly provided with a connecting plate B 155, the connecting plate B 155 is fixedly connected with the sliding plate B 1418, the square column 151 is fixedly provided with a ring block 156 at both ends, the ring block 156 is rotatably connected with the rectangular block 141, the square column 151 is provided with an air hole communicated with the ring block 156. Through the structural arrangement of the adjusting assembly 15, the square column 151 rotates to drive the movable slot 152 to rotate, so that the synchronous movement of the movable columns 153 is caused, the connecting plate A 154 drives the sliding plate A 1414 to slide on the sliding groove A 1413, the connecting plate B 155 drives the sliding plate B 1418 to slide on the sliding groove B 1417, so that the vertical bars A 1412 and the vertical bars B 1416 slide at the same time, the shape of the adjusting block assembly 14 is adjusted, so that the rectangular tube blank with a smooth inner surface and the rectangular tube blank with a plurality of vertical ribs on the surface are manufactured.

[0073] In the embodiment of the present application, as Figure 11 and Figure 16As shown, the bottom end of the connecting block 142 is provided with a rotating groove 1421, and the rotating groove 1421 is provided with a bearing assembly 16, which comprises a rotating ring A161 rotatably arranged on the rotating groove 1421, the bottom end of the rotating ring A161 is fixedly connected with the ring block 156 located above, a plurality of triangular grooves A162 are arranged on the outer edge surface of the rotating ring A161, a locking column A163 is movably arranged on the triangular groove A162, the locking column A163 is elastically connected with the triangular groove A162 through a spring A164, the rotating ring B165 is rotatably connected on the rotating ring A161, the top end of the rotating ring B165 extends into the circular table block 131 through the connecting block 142 and is fixedly connected with the bottom end of the ring pipe 134, a plurality of triangular grooves B166 are arranged on the outer edge surface of the rotating ring B165, a locking column B167 is movably arranged on the triangular groove B166, the locking column B167 is elastically connected with the triangular groove B166 through a spring B168. Through the above arrangement, the rotating ring A161 and the rotating groove 1421 form a one-way bearing structure that the rotating ring A161 can only rotate in the forward direction relative to the rotating groove 1421, the rotating ring B165 and the rotating ring A161 form a one-way bearing structure that the rotating ring B165 can only rotate in the reverse direction relative to the rotating ring A161, the one-way bearing structure is a prior art, which will not be described here, so that when the ring pipe 134 rotates in the forward direction, the rotating ring B165 drives the rotating ring A161 to rotate in the forward direction as a whole, so that the ring block 156 drives the square column 151 to rotate, adjusts the shape of the block assembly 14, when the ring pipe 134 rotates in the reverse direction, the rotating ring A161 does not rotate, ensures that the block assembly 14 is in the shape, and the ring pipe 134 drives the threaded plate 137 to rotate, and a rectangular pipe blank is made. Among them, the ring pipe 134, the rotating ring B165, the ring block 156 and the air hole constitute a gas conveying channel, and the gas output by the gas conveying mechanism passes through the gas conveying channel to convey gas into the rectangular pipe blank.

[0074] In the embodiment of the present application, as shown in Figure 3 As shown, the top end of the lower mold 2 is provided with an injection cavity A21 communicated with the rectangular pipe cavity. The lower mold 2 of the present application is provided with a cooling mechanism A, which is used to drive the lower mold 2 to rise and contact the bottom end of the upper mold 1 through the lifting mechanism 02, so that the injection cavity A21 is communicated with the rectangular pipe cavity, and the plastic molten liquid enters the injection cavity A21 for cooling, so as to pre-inject the connection part of one component and another component of the foldable pet ladder, so that the connection part of one component and another component of the foldable pet ladder is a solid, which improves the mechanical strength. After injection is completed, the lower mold 2 is driven to descend by the lifting mechanism 02, and the plastic molten liquid forms a rectangular pipe blank with a closed bottom through the rectangular pipe cavity. Compared with the traditional circular pipe blank, the deformation of the rectangular pipe blank during subsequent blow molding is reduced.

[0075] In the embodiment of the present application, as shown in Figure 4As shown, the left mold 3 is provided with a plastic cavity B31, and both sides of the plastic cavity B31 are fixedly provided with a sliding bar 32, and the sliding bar 32 is matched with the shape of the plastic cavity B31.

[0076] In the embodiment of the present application, as shown in Figure 5 As shown, the right mold 4 is provided with a plastic cavity C41, and both sides of the plastic cavity C41 are provided with a sliding groove Y42, and the sliding groove Y42 is in sliding cooperation with the sliding bar 32.

[0077] In the embodiment of the present application, as shown in Figure 4 and Figure 5 As shown, the left mold 3 and the right mold 4 are provided with a sliding groove Z43 at the top end of the side close to each other, and a plurality of spring holes 47 are uniformly arranged on the sliding groove Z43, and a sliding seat 44 is slidably arranged on the sliding groove Z43, and the two sliding seats 44 are close to the end and are wavy, and the top end of the two sliding seats 44 is fixedly provided with a cutter 45, and the sliding seat 44 and the corresponding plurality of spring holes 47 are elastically connected through a spring C46. The right mold 4 of the present application is provided with a cooling mechanism C, which is a prior art in the field, and will not be repeated here. Through the structural design of the left mold 3 and the right mold 4, when the left mold 3 and the right mold 4 are driven to be relatively close by the two translation mechanisms 03, the two sliding seats 44 first contact and extrude the top end of the rectangular tube blank, so that both ends of the rectangular tube blank are closed, and the two sliding bars 32 preliminarily limit the rectangular tube blank, and the surface of the sliding bar 32 can be coated with a lubricant according to the plastic material, until the left mold 3 and the right mold 4 are in contact, the plastic cavity B31 and the plastic cavity C41 are closed to press the rectangular tube blank into a foldable pet ladder part with excess material on the top. Compared with the traditional process in which the side is provided with excess material, the present application reduces the plastic loss and the workload of manual post-processing. In this process, compared with the traditional blow molding process, the process of the present application utilizes the plastic cavity B31 and the plastic cavity C41 when they are closed, the compressed gas formed by the compressed gas will quickly disperse the stress to assist the shape change of the rectangular tube blank. Compared with the traditional method of cutting the tube blank to release the gas before the left mold 3 and the right mold 4 are in contact, not only the process steps are reduced, the gas loss is reduced, and the internal gas pressure of the foldable pet ladder part when the plastic cavity B31 and the plastic cavity C41 are closed is ensured, the contact between the foldable pet ladder part and the plastic cavity B31 and the plastic cavity C41 is ensured, the defect of the surface of the foldable pet ladder part caused by the insufficient gas pressure caused by the traditional process of releasing the gas in advance is reduced, and the compressed gas is equivalent to injecting dynamic support force into the hollow structure of the foldable pet ladder part. The internal pressure can enhance the overall stability of the structure, compensate for the reduction of material thickness, reduce the thickness of the tube wall to achieve lightweight, and still maintain or even exceed the rigidity of the thick-walled structure without internal pressure.

[0078] Working principle: the present embodiment provides a foldable pet ladder forming mold based on hollow blow molding technology, which is used according to the following steps:

[0079] S1: Adjust the shape of the rectangular block assembly 14 according to the requirements;

[0080] The output shaft of the motor 130 drives the chain wheel B 139 fixed above the mounting groove 113 to rotate, and the chain wheel B 139 drives the chain wheel A 138 fixed on the ring pipe 134 to rotate synchronously through the chain transmission, and then the ring pipe 134 drives the rotating ring B 165 and the rotating ring A 161 to rotate synchronously in the same direction, and the ring block 156 drives the square column 151 to rotate, and the four movable columns 153 on the movable groove 152 move synchronously along the track of the movable groove 152, wherein two movable columns 153 drive the sliding plate A 1414 to slide along the sliding groove A 1413 through the connecting plate A 154, and the sliding plate A 1414 pulls a plurality of vertical strips A 1412 to move synchronously along the vertical groove A 1411; the other two movable columns 153 drive the sliding plate B 1418 to slide along the sliding groove B 1417 through the connecting plate B 155, and the sliding plate B 1418 pulls a plurality of vertical strips B 1416 to move synchronously along the vertical groove B 1415.

[0081] If a rectangular tubular parison with a flat inner surface is needed, adjust the eccentric end of the sliding plate A 1414 and the sliding plate B 1418 to the sliding groove A 1413 and the sliding groove B 1417, so that the vertical strips A 1412 and the vertical strips B 1416 are respectively collected to the eccentric end of the vertical groove A 1411 and the vertical groove B 1415, at this time a plurality of vertical strips A 1412 and vertical strips B 1416 together with the rectangular block 141 form a rectangular structure with a flat surface.

[0082] If a rectangular tubular parison with vertical ribs on the inner surface is needed, adjust the sliding plate A 1414 and the sliding plate B 1418 to the centripetal end of the sliding groove A 1413 and the sliding groove B 1417, so that the vertical strips A 1412 and the vertical strips B 1416 extend out of the vertical groove A 1411 and the vertical groove B 1415, at this time the vertical strips A 1412 and the vertical groove A 1411 form a concave rib channel A, and the vertical strips B 1416 and the vertical groove B 1415 form a concave rib channel B.

[0083] S2: Pre-injection molding connection part;

[0084] Mold closed positioning: start the lifting mechanism 02 in the frame body 01, the movable end of the lifting mechanism 02 drives the lower mold 2 to vertically rise, until the top end of the lower mold 2 closely contacts with the bottom end of the upper mold 1, at this time the injection molding cavity A 21 of the lower mold 2 and the rectangular pipe cavity of the upper mold 1 are precisely communicated by the gap between the rectangular block assembly 14 and the mounting cavity 111.

[0085] Melt injection and cooling: start the melt feeding mechanism 04, the molten plastic enters the heating tube 136 through the inlet pipe of the heating tube 136, and the heating tube 136 keeps the molten plastic warm; at the same time, the motor 130 drives the ring tube 134 to rotate the threaded plate 137, which pushes the molten plastic in the heating tube 136 to enter the pre-storage tank 122 through the inlet channel formed by the ring tube 134, the circular table block 131 and the adaptive block 133, and the molten plastic in the pre-storage tank 122 flows into the injection cavity A21 along the rectangular tube cavity under the pushing force of the threaded plate 137, and when the injection cavity A21 is filled with molten plastic, the molten plastic in the injection cavity A21 cools and solidifies into a solid connection part of the two parts of the foldable pet ladder.

[0086] S3: preparation of rectangular tube parison with flat inner surface or vertical ribs;

[0087] Main body forming of tube parison: after the connection part is formed, the lifting mechanism 02 drives the lower mold 2 to vertically descend, so that the lower mold 2 is separated from the upper mold 1, the melt feeding mechanism 04 keeps feeding, the motor 130 drives the threaded plate 137 to continue rotating and push the molten plastic in the heating tube 136 to flow into the rectangular tube cavity through the inlet channel and the pre-storage tank 122, if it is a flat inner surface tube parison, the molten plastic falls along the flat rectangular tube cavity to form a rectangular tube parison with flat inner surface and closed bottom, if it is a ribbed tube parison, the molten plastic falls along the formed rectangular tube cavity with grooves to form a rectangular tube parison with several vertical ribs on the inner surface and closed bottom.

[0088] Gas input into tube parison: during the preparation of the tube parison, the gas from the external gas feeding mechanism enters the inside of the rectangular tube cavity to pre-charge a certain pressure of gas inside the tube parison, which reserves the internal pressure for subsequent blow molding.

[0089] S4: mold closing and blow molding

[0090] Mold preliminary closing and tube end closing: start the two translation mechanisms 03 on the frame 01, the movable ends of the two translation mechanisms 03 drive the left mold 3 and the right mold 4 to move closer to each other, during the movement of the left mold 3 and the right mold 4, the two sliding seats 44 first contact, and under the pushing force of the mold continuously closing, the two sliding seats 44 slide to the inside of the mold along the sliding groove Z43, the cutting knife 45 at the top end of the sliding seat 44 extrudes and cuts the top end of the rectangular tube parison, so that the top end of the rectangular tube parison is closed.

[0091] The left mold 3 and the right mold 4 continue to approach, the slide bar 32 of the left mold 3 is inserted into the sliding groove Y42 of the right mold 4, the slide bar 32 preliminarily limits both sides of the rectangular pipe parison, avoids that the pipe parison deviates in the mold closing process, until the left mold 3 and the right mold 4 are completely contacted, the plastic cavity B31 of the left mold 3 and the plastic cavity C41 of the right mold 4 are closed to form a complete pet ladder part cavity, under the extrusion of the plastic cavity B31 and the plastic cavity C41, the rectangular pipe parison gradually adheres to the inner wall of the cavity, in the plastic cavity closing process, the gas in the pipe parison forms a sustained internal pressure under the extrusion of the cavity. The internal pressure assists the pipe parison to quickly adhere to the inner wall of the plastic cavity B31 and the plastic cavity C41, eliminates defects such as surface depression and corner material shortage, and finally makes the pipe parison form the foldable pet ladder part with the excess material at the top under the extrusion and internal pressure of the cavity, the remaining compression provides support for the hollow structure of the foldable pet ladder part, and enhances the overall stability of the structure.

[0092] The embodiments of the present application are disclosed, but not limited to the preferred embodiments, and the ordinary skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, they are within the protection scope of the present application.

Claims

1. A collapsible pet ladder forming mold based on a hollow blow molding technique, characterized by, It include upper mould (1), lower mould (2), left mould (3) and right mould (4); The upper mould (1) includes a mounting seat (11), the mounting seat (11) is provided with a heating block (12), the bottom end of the heating block (12) is provided with a rectangular groove (121), the rectangular groove (121) is provided with a rectangular block assembly (14), and the rectangular block assembly (14) and the rectangular groove (121) are gap rectangular lumen; The rectangular block assembly (14) includes a rectangular block (141), the rectangular block (141) is provided in the rectangular groove (121), the rectangular block (141) is provided with a plurality of vertical grooves A (1411) at both ends of the axial direction, the vertical groove A (1411) is provided with a vertical bar A (1412) slidingly, the rectangular block (141) is provided with a plurality of vertical grooves B (1415) at both ends of the radial direction, and the vertical groove B (1415) is provided with a vertical bar B (1416) slidingly; The top end of the lower mould (2) is provided with an injection cavity A (21) communicated with the rectangular lumen; The left mould (3) is provided with a plastic cavity B (31) on the top end; The right mould (4) is provided with a plastic cavity C (41) on the top end, and the top end of the left mould (3) and the right mould (4) is provided with a sliding groove Z (43), a plurality of spring holes (47) are arranged on the sliding groove Z (43), and a sliding seat (44) is slidingly arranged on the sliding groove Z (43), both ends of the sliding seat (44) are wave-shaped, a cutter (45) is fixedly arranged on the top end of the sliding seat (44), and the sliding seat (44) and the corresponding plurality of spring holes (47) are elastically connected through a spring C (46).

2. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 1, characterized in that, The bottom end of the mounting seat (11) is provided with a mounting cavity (111), the top end of the mounting cavity (111) is provided with a circular cavity (112), and the top side of the mounting seat (11) is provided with a mounting groove (113).

3. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 2, characterized in that, The heating block (12) is fixedly arranged on the mounting cavity (111); The top end of the rectangular groove (121) is provided with a pre-storage groove (122), the pre-storage groove (122) is in the form of a four-pyramid structure with the top larger than the bottom, the top end of the heating block (12) is provided with a circular groove (123), and the circular groove (123) and the pre-storage groove (122) are communicated through an adaptive groove (124).

4. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 3, characterized in that, The upper mould (1) further includes a material guiding assembly (13), the material guiding assembly (13) includes a circular block (131) arranged in the circular groove (123) and an adaptive block (133) arranged in the adaptive groove (124), the circular block (131) and the circular groove (123) are fixedly connected through a plurality of connecting plates (132) arranged in the form of an annular equidistant structure, the top end of the adaptive block (133) is fixedly connected with the bottom end of the circular block (131), and the adaptive block (133) and the adaptive groove (124) are gap into a material inlet channel.

5. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 4, characterized in that, The material guiding assembly (13) further comprises a material guiding unit, the material guiding unit comprises a ring pipe (134), a heating pipe (136), a chain wheel A (138), a chain wheel B (139) and a motor (130), the ring pipe (134) is rotationally arranged on the circular table block (131), the top end of the ring pipe (134) penetrates through the mounting seat (11) and is rotationally arranged with a joint (135), the heating pipe (136) is fixedly arranged on the circular cavity (112), the heating pipe (136) is arranged with a feeding pipe penetrating through the mounting seat (11), the heating pipe (136) is arranged with a threaded plate (137) fixedly connected with the ring pipe (134), the chain wheel A (138) is fixedly arranged on the ring pipe (134), the chain wheel B (139) is arranged above the mounting seat (11) relative to the mounting groove (113), the chain wheel A (138) and the chain wheel B (139) are drivingly connected through a chain, the chain wheel B (139) is rotationally connected with the mounting seat (11) through a rotating shaft, the motor (130) is fixedly arranged on the mounting groove (113), the bottom end of the rotating shaft penetrates into the mounting groove (113) and is fixedly connected with the output shaft of the motor (130).

6. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 5, characterized in that, The top end of the rectangular block (141) is fixedly connected with the bottom end of the adaptive block (133) through a connecting block (142), a plurality of the vertical grooves A (1411) are connected in communication through a sliding groove A (1413), the sliding groove A (1413) is slidingly arranged with a sliding plate A (1414) fixedly connected with a plurality of the vertical bars A (1412), a plurality of the vertical grooves B (1415) are connected in communication through a sliding groove B (1417), the sliding groove B (1417) is slidingly arranged with a sliding plate B (1418) fixedly connected with a plurality of the vertical bars B (1416).

7. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 6, characterized in that, The middle part of the rectangular block (141) is arranged with an empty groove (1419) in communication with the two sliding grooves A (1413), the sliding groove B (1417) and the empty groove (1419) are connected in communication through a sliding groove X (1410).

8. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 6, characterized in that, The upper mold (1) further comprises an adjusting assembly (15), the adjusting assembly (15) comprises a square column (151), the corner of the square column (151) is arranged with a rounded corner, the surface of the square column (151) is arranged with a movable groove (152), the movable groove (152) is movably arranged with four movable columns (153), two of the movable columns (153) are fixedly arranged with a connecting plate A (154), the connecting plate A (154) is fixedly connected with the sliding plate A (1414), the other two of the movable columns (153) are fixedly arranged with a connecting plate B (155), the connecting plate B (155) is fixedly connected with the sliding plate B (1418), the two ends of the square column (151) are fixedly arranged with a ring block (156) rotationally connected with the rectangular block (141), the square column (151) is arranged with an air hole in communication with the ring block (156).

9. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 8, characterized in that, The bottom end of the connecting block (142) is provided with a rotating groove (1421), and the rotating groove (1421) is provided with a bearing assembly (16). The bearing assembly (16) comprises a rotating ring A (161) rotatably arranged on the rotating groove (1421). The bottom end of the rotating ring A (161) is fixedly connected with the ring block (156) located above. A plurality of triangular grooves A (162) are formed on the outer edge surface of the rotating ring A (161). A lock column A (163) is movably arranged on the triangular groove A (162). The lock column A (163) and the triangular groove A (162) are elastically connected through a spring A (164). The rotating ring A (161) is rotatably connected with a rotating ring B (165). The top end of the rotating ring B (165) extends out of the connecting block (142) and extends into the circular table block (131) and is fixedly connected with the ring pipe (134). A plurality of triangular grooves B (166) are formed on the outer edge surface of the rotating ring B (165). A lock column B (167) is movably arranged on the triangular groove B (166). The lock column B (167) and the triangular groove B (166) are elastically connected through a spring B (168).

10. The collapsible pet ladder forming mold based on the hollow blow molding technique according to claim 1, characterized in that, Both sides of the plastic cavity B (31) are fixedly provided with sliding strips (32), and the sliding strips (32) are adaptively shaped with the plastic cavity B (31); Both sides of the plastic cavity C (41) are provided with sliding grooves Y (42), and the sliding grooves Y (42) are in sliding cooperation with the sliding strips (32).

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