Plastic bottle blowing mold

Abstract

The invention relates to the technical field of blank injection blow molding, in particular to a plastic bottle blow molding mold which comprises a mounting frame, blow molding mold plates which are symmetrical up and down are arranged on the inner side of the mounting frame, and a first mold closing surface and a second mold closing surface are arranged on the opposite sides and the front sides of the two blow molding mold plates correspondingly. The surfaces of the two first mold closing faces are each provided with evenly-distributed bottle blank manufacturing cavities, the surfaces of the two second mold closing faces are each provided with evenly-distributed blow molding cavities, the number of the bottle blank manufacturing cavities is equal to that of the blow molding cavities, and the front sides of the bottle blank manufacturing cavities correspond to the positions of the center lines of the blow molding cavities. The two sets of molds are integrated on the two faces of one mold plate, overturning of the mold faces is completed through cooperation of the lifting mechanism and the overturning mechanism, and therefore bottle preform manufacturing and blow molding of plastic bottles can be completed through one set of mold, the manufacturing cost of the mold is reduced, and meanwhile the mold is convenient to use. And due to higher integration, the requirement of the mold on the occupied field is lower.

Description

Technical Field

[0001] The invention relates to the technical field of injection blow molding, in particular to a plastic bottle blow molding mold. Background Art

[0002] Because plastic bottles are not easy to break, low cost, high transparency, easy to carry and easy to recycle, they have become the main packaging containers for liquids or solids such as beverages, dried fruits, sauces, pickles, cooking oils, and pesticides and veterinary drugs in life. Plastic bottles are mainly made by melting raw materials such as PET, PE or PP at high temperature, and then blow molding, extrusion blow molding or injection molding through plastic molds.

[0003] Injection blow molding has a high degree of automation and does not require manual secondary processing. The prepared products have a more beautiful appearance, no waste at the bottle mouth and bottle bottom, and the bottle mouth is flat and has good sealing properties, so it is particularly suitable for use as medicine bottles.

[0004] In the process of injection blow molding of plastic bottles, it is necessary to make the embryo of the plastic bottle through the bottle embryo template, and then transfer the embryo to the blow molding template for blow molding. Therefore, at least two sets of molds are required to cooperate to complete the process. The existing mold preparation cost is relatively expensive and occupies a large area, which makes the injection blow molding that requires two sets of molds difficult to promote and use for small and medium-sized enterprises. In the process of embryo transfer, the embryo may be unevenly heated, resulting in stress damage, which will make the blow-molded product easy to crack. For this reason, a plastic bottle blow molding mold is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a plastic bottle blow molding mold, which solves the problem that the existing injection molding blow molding requires at least two sets of molds to cooperate to complete. By integrating the bottle preform production and blow molding on a set of molds, the bottle preform and blow molding processes can be completed regularly during the process of opening and closing the mold.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A plastic bottle blow molding mold, comprising a mounting frame, wherein a blow molding template symmetrically arranged in the upper and lower sides is arranged inside the mounting frame, a first mold surface and a second mold surface are arranged on opposite sides and the front sides of the two blow molding templates, respectively, the surfaces of the two first mold surfaces are provided with evenly distributed preform manufacturing cavities, the surfaces of the two second mold surfaces are provided with evenly distributed blow molding cavities, the number of the preform manufacturing cavities and the blow molding cavities is equal, and the center line positions of the front sides of the preform manufacturing cavities and the blow molding cavities are correspondingly arranged, and the left and right sides of the two blow molding templates are provided with lifting and flipping mechanisms symmetrically arranged in the upper and lower directions;

[0008] The lifting and flipping mechanism includes a lifting mechanism and a flipping mechanism, and the lifting mechanism and the flipping mechanism are used to complete the corresponding mold surface clamping of the first mold surface and the second mold surface respectively when driving the two blow molding templates to move toward each other, and when the two blow molding templates move away from each other to a specified height, the mold surface switching and flipping of the first mold surface and the second mold surface are completed while moving.

[0009] In the above scheme, this scheme is implemented by the following steps: 1. The blow molding template is driven to close and open the mold through the lifting mechanism; 2. The blow molding template is driven to flip 90° while lifting and lowering through the flipping mechanism to realize the conversion of the mold surface; there are many mechanisms that can realize the above scheme in the existing technical scheme, such as cylinder motor combination, gear rack combination and reasonable combination of pulleys; however, compared with this scheme, some of the various combination schemes for lifting and flipping require combined control of multiple power sources, and this control may have certain errors, thereby affecting the mold opening work. Some structural combinations are more complicated, which leads to an increase in the volume of the entire mold, and when there is a fault, maintenance is also more troublesome.

[0010] Preferably, the lifting mechanism includes a cylinder, a spring, a side plate, a "U"-shaped plate, a limiting slide plate and a limiting slide groove, the side plates are located on the left and right sides of the blow molding template, the "U"-shaped plate is slidably connected to the outer side of the side plate, the cylinder output end is fixedly connected to the "U"-shaped plate, and the other end of the cylinder is fixedly connected to the bottom of the mounting frame, the springs are symmetrically arranged, one end of the top and bottom springs are fixedly connected to the mounting frame, and the other end of the top spring is fixedly connected to the corresponding side plate, and the other end of the bottom spring is movably connected to the corresponding side plate.

[0011] In the above scheme, the top spring is used to provide an upward force when the two blow molding templates are opened, thereby reducing the pulling force of the top cylinder. The bottom spring is used to assist in completing the conversion of the first mold surface and the second mold surface without generating a force that resists the bottom cylinder when the mold is closed, thereby making the mold closing tighter.

[0012] Preferably, the limiting slide plate is symmetrically arranged and fixedly connected to one side of the "U"-shaped plate, the limiting slide groove is opened on the outer side of the side plate and its position corresponds to the limiting slide plate, and the central axis of the cylinder coincides with the central axis of the side plate.

[0013] In the above solution, the central axis of the cylinder coincides with the central axis of the side plate, so that the cylinder and the two symmetrically arranged limit slide plates are distributed in a triangular shape, thereby ensuring the balance of the cylinder when pulling the blow molding template to move.

[0014] Preferably, the telescopic speed of the bottom cylinder is 1.2-1.3 times that of the top cylinder, and the bottom blow molding template always reaches the mold closing point 2-3S earlier than the top blow molding template.

[0015] In the above scheme, by setting the time difference between the bottom and top of the blow molding template reaching the mold closing point, the bottom template can act as a supporting plate, thereby avoiding the two templates colliding at the same speed, which would cause damage to the mold surface during long working conditions.

[0016] Preferably, the flipping mechanism includes a connecting column, an "L"-shaped control link, a matching plate, a control slide groove and an electric telescopic rod, the connecting column is fixedly connected to the left and right sides of the blow molding template and passes through the center point of the side plate, the "L"-shaped control link is fixedly connected to the outer end of the connecting column, the matching plate is fixedly connected to the "U"-shaped plate, and a control slide groove corresponding to the outer end of the "L"-shaped control link is opened on the outer side of the matching plate, the electric telescopic rod is located in the inner cavity of the two control slide grooves at the bottom, and the electric telescopic rod is used to limit the limit slide plate after the first mating surface is converted to the second mating surface.

[0017] Preferably, the left side cross-sections of the two blow molding templates are arranged in a square shape, and the connecting column is located at the center point of the side of the blow molding template.

[0018] In the above scheme, the size of the blow molding template is limited to ensure that the positioning points of the two sets of molds are overlapped, so that the bottle preform can be blown without moving.

[0019] Preferably, the surface of the first mold joint is provided with evenly distributed matching grooves, the matching grooves and the preform manufacturing cavity are equal in number and corresponding in position, a feeding pipe is provided in the inner cavity of the matching groove at the top, and the diameter of the matching groove at the bottom is 1.2-1.3 times that of the matching groove at the top.

[0020] In the above scheme, the diameter of the bottom matching groove is set to 1.2-1.3 times that of the top matching groove, so that it can also be used as a ventilation groove while being assembled with the top feeding pipe, without the need to open a separate ventilation groove, thereby reducing the mold grooving work.

[0021] Preferably, the discharge port of the feeding tube is arranged in a semicircular arc, and the bottom length is greater than the top length, the bottom of the discharge end of the feeding tube is arranged to be thin at the front and thick at the back, and the cross-sectional angle is 30°-45°.

[0022] In the above scheme, by setting the bottom length of the discharge end of the feeding tube to be greater than the top length, the residual molten plastic at the rear end of the bottle embryo can be scraped off by moving the feeding tube port upward when opening the mold, thereby ensuring the beauty of the bottom of the bottle embryo and reducing the waste of the material.

[0023] Preferably, evenly distributed cooling pipes are provided on the rear sides of the two blow molding templates, the distance between the cooling pipes and the matching grooves at the bottom is 10-15 mm, the cooling pipes are arranged in a "U" shape, and the cold water inlet of the cooling pipes is always at the end away from the matching grooves.

[0024] In the above scheme, the shape of the cooling pipe and the water inlet are limited so that cold water always enters from the top, and the high-temperature water after cooling the mold flows through the bottom of the cooling pipe, thereby insulating the discharge port of the feeding pipe in the matching groove with a spacing of only 10-15mm, avoiding solidification at the discharge port, resulting in uneven subsequent discharge or increased discharge time.

[0025] Preferably, both second mold surfaces are provided with evenly distributed exhaust grooves, the exhaust grooves are arranged in a trapezoidal shape, and a relatively small end of the exhaust groove is communicated with the blow molding cavity.

[0026] In the above scheme, the trapezoidal arrangement of the exhaust groove can increase the exhaust volume, and the impurities inside the exhaust groove can be cleaned while the die surface is converted, so that they fall out vertically.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Existing blow molding molds for plastic bottles, especially injection blow molding molds, whether one-step or two-step, require at least two sets of molds to cooperate to complete, and the existing mold manufacturing costs are relatively high, so the cooperation of two sets of molds limits the use and promotion of injection blow molding molds. The present invention integrates two sets of molds on both sides of a template, and completes the flipping of the mold surface through the cooperation of the lifting mechanism and the flipping mechanism. Therefore, one set of molds can be used to complete the preform production and blow molding of plastic bottles, which reduces the cost of the mold. At the same time, higher integration also makes the mold have lower requirements for site occupancy, and it can also be adapted to enterprises with limited site.

[0029] 2. The present invention integrates two sets of molds on two sides of a template. When the process steps of bottle preform production and blow molding are switched, it is not necessary to move the already formed bottle preform, thereby avoiding uneven cooling of the bottle preform during movement, which may cause stress damage and easy cracking of the blow-molded plastic products. The quality of the plastic products is ensured and the qualified rate is improved. It can also avoid the deviation of the bottle preform after movement, which may cause inaccurate positioning and affect the subsequent blow molding.

[0030] 3. The present invention sets the time difference between the two blow molding templates reaching the mold closing point. When the mold is closed, the bottom blow molding template always reaches the mold closing point earlier than the top blow molding template. Therefore, the bottom blow molding template can be used as a supporting plate. It can not only avoid the damage to the template caused by the collision of the two blow molding templates at the same speed and improve the service life of the template, but also avoid the vibration caused by the collision of the templates at the same speed causing the bottle preform in the blow molding cavity to shift, thereby ensuring the accuracy of positioning during subsequent blow molding and avoiding defects in the blow-molded product caused by positioning shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] The above and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0033] Figure 1 It is a schematic structural diagram of the first mold surface in the mold opening state of the present invention;

[0034] Figure 2 It is a schematic structural diagram of the first mold clamping surface in the mold clamping state of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure after the first mold surface and the second mold surface of the present invention are turned over;

[0036] Figure 4 It is a schematic structural diagram of the second mold surface in the mold clamping state of the present invention;

[0037] Figure 5 It is a schematic diagram of the front structure of the blow molding template of the present invention;

[0038] Figure 6 It is a schematic diagram of the back structure of the blow molding template of the present invention;

[0039] Figure 7 It is a schematic diagram of the structure of the feeding pipe of the present invention;

[0040] Figure 8 It is a schematic diagram of the structure of the turning mechanism of the present invention.

[0041] In the figure: 100, mounting frame; 101, blow molding template; 102, first mold surface; 103, preform manufacturing cavity; 104, second mold surface; 105, blow molding cavity; 106, matching groove; 107, feeding pipe; 108, cooling pipe; 109, exhaust groove; 200, lifting mechanism; 201, cylinder; 202, spring; 203, side plate; 204, "U"-shaped plate; 205, limit slide plate; 206, limit slide groove; 300, flip mechanism; 301, connecting column; 302, "L"-shaped control connecting rod; 303, matching plate; 304, control slide groove; 305, electric telescopic rod. DETAILED DESCRIPTION

[0042] The following is a more clear and complete description of the technical solutions in the embodiments of the present invention in combination with the drawings in the embodiments of the present invention, and the described embodiments are only a part of all the embodiments of the present invention. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention;

[0043] See also Figures 1 to 8 The present invention provides a plastic bottle blow molding mold, and the technical solution is as follows:

[0044] A plastic bottle blow molding mold comprises a mounting frame 100, wherein a blow molding template 101 symmetrically disposed in the mounting frame 100 is disposed inside, wherein a first mating surface 102 and a second mating surface 104 are disposed on opposite sides and the front sides of the two blow molding templates 101, respectively, wherein evenly distributed preform manufacturing cavities 103 are formed on the surfaces of the two first mating surfaces 102, evenly distributed blow molding cavities 105 are formed on the surfaces of the two second mating surfaces 104, the number of the preform manufacturing cavities 103 and the blow molding cavities 105 are equal, and the center line positions of the front sides of the preform manufacturing cavities 103 and the blow molding cavities 105 are correspondingly disposed, and a lifting and flipping mechanism symmetrically disposed in the upper and lower directions is disposed on the left and right sides of the two blow molding templates 101;

[0045] The lifting and flipping mechanism includes a lifting mechanism 200 and a flipping mechanism 300. The lifting mechanism 200 and the flipping mechanism 300 are used to respectively complete the corresponding mold surface closing and mold opening of the first mold surface 102 and the second mold surface 104 when driving the two blow molding templates 101 to move toward each other. When the two blow molding templates 101 move away from each other to a specified height, the mold surface switching and flipping of the first mold surface 102 and the second mold surface 104 are completed while moving.

[0046] As an embodiment of the present invention, refer to Figures 1 to 4The lifting mechanism 200 includes a cylinder 201, a spring 202, a side plate 203, a "U"-shaped plate 204, a limiting slide plate 205 and a limiting slide groove 206. The side plates 203 are located on the left and right sides of the blow molding template 101, and the "U"-shaped plate 204 is slidably connected to the outer side of the side plates 203. The output end of the cylinder 201 is fixedly connected to the "U"-shaped plate 204, and the other end of the cylinder 201 is fixedly connected to the bottom of the mounting frame 100. The springs 202 are symmetrically arranged, and one end of the top and bottom springs 202 are fixedly connected to the mounting frame 100, and the other end of the top spring 202 is fixedly connected to the corresponding side plate 203. When the mold is opened, the rebound force generated by the top spring 202 is in the same direction as the force in the mold opening direction, so it can be In order to reduce the pulling force required to be provided by the top cylinder 201, on the one hand, it makes the mold opening faster, and on the other hand, it prolongs the service life of the top cylinder 201. The other end of the bottom spring 202 is movably connected to the corresponding side plate 203. The specific connection method is abutment, which can enable the bottom spring 202 to provide a force opposite to the movement of the bottom side plate 203 when the bottom side plate 203 moves away from each other. In this way, the flip mechanism 300 can realize the flip conversion between the first mold surface 102 and the second mold surface 104, and no opposing force will be generated when the bottom side plate 203 moves towards each other, so that the bottom side plate 203 and the blow molding template 101 can move completely with the force of the cylinder 201. , so that it can press against the top blow molding template 101 upwards, ensuring the tightness of the mold; the limiting slide plate 205 is symmetrically arranged and fixedly connected to one side of the "U"-shaped plate 204, the limiting slide groove 206 is opened on the outside of the side plate 203 and the position corresponds to the limiting slide plate 205, the central axis of the cylinder 201 coincides with the central axis of the side plate 203, and the central axis of the cylinder 201 coincides with the central axis of the side plate 203, so that the cylinder 201 and the two symmetrically arranged limiting slide plates 205 are distributed in a triangle, thereby ensuring the balance of the cylinder 201 when pulling the blow molding template 101 to move, avoiding the generation of excess counteracting force due to the center offset, affecting the rise of the blow molding template 101 and Flip; the telescopic speed of the bottom cylinder 201 is 1.2-1.3 times that of the top cylinder 201, and the bottom blow molding template 101 always arrives at the mold closing point 2-3S earlier than the top blow molding template 101. By setting the value here, the bottom blow molding template 101 can always reach the mold closing point earlier than the top blow molding template 101, thereby avoiding the two blow molding templates 101 from colliding at the same speed, reducing the collision damage between the blow molding templates 101, and extending the service life of the blow molding template 101. At the same time, it can avoid the vibration caused by the same-speed collision causing the bottle embryo in the blow molding cavity 105 to shift in position, ensuring the accuracy of positioning during subsequent blow molding, and avoiding defects in the blow-molded product caused by positioning shift.

[0047] As an embodiment of the present invention, refer to Figure 8The flip mechanism 300 includes a connecting column 301, an "L"-shaped control link 302, a matching plate 303, a control slide 304 and an electric telescopic rod 305. The connecting column 301 is fixedly connected to the left and right sides of the blow molding template 101 and passes through the center point of the side plate 203. The "L"-shaped control link 302 is fixedly connected to the outer end of the connecting column 301. The matching plate 303 is fixedly connected to the "U"-shaped plate 204, and a control slide 304 corresponding to the outer end of the "L"-shaped control link 302 is opened on the outer side of the matching plate 303. The electric telescopic rod 305 is fixedly connected to the inner cavity of the two bottom control slides 304. The electric telescopic rod 305 is used to limit the limiting slide plate 205 after the first mold surface 102 is converted to the second mold surface 104. Therefore, the blow molding template 101 can be driven to flip 90° in the flip mechanism 300, that is, the second mold surface 104 is rotated to the original first mold surface After the surface 102 is in position, the position of the limiting slide plate 205 is limited to ensure that the two second mold surfaces 104 will not be converted again after the lifting mechanism 200 moves towards each other, and the two second mold surfaces 104 can complete the mold closing, thereby realizing the blow molding of the plastic bottle; the left side cross-sections of the two blow molding templates 101 are set in a square, and the connecting column 301 is located at the side center point of the blow molding template 101. When the left side cross-section of the blow molding template 101 is set in a square, that is, its lateral sides are equal, after a 90° flip, the positioning point will not be offset, so the subsequent blow molding can be completed without moving the bottle embryo, avoiding uneven cooling of the bottle embryo during movement, thereby causing stress damage and easy cracking of the blow-molded product, and at the same time avoiding the displacement of the bottle embryo after movement, thereby causing inaccurate positioning and affecting the subsequent blow molding.

[0048] As an embodiment of the present invention, refer to Figure 5The first mold surface 102 is provided with evenly distributed matching grooves 106. The matching grooves 106 and the preform manufacturing cavity 103 are equal in number and corresponding in position. The inner cavity of the top matching groove 106 is provided with a feeding pipe 107. The diameter of the bottom matching groove 106 is 1.2-1.3 times that of the top matching groove 106. By setting the values ​​here, a certain gap can still exist between the bottom matching groove 106 and the top matching groove 106 after matching. Therefore, the bottom matching groove 106 can be used as an exhaust channel when the preform manufacturing cavity 103 is molded to produce the preform. There is no need to open an exhaust channel separately, which reduces the mold slotting work. The discharge port of the feeding tube 107 is set in a semicircular arc, and the bottom length is greater than the top length. The bottom of the discharge end of the feeding tube 107 is set to be thin at the front and thick at the back, and the cross-sectional angle is 30°-45°. The cross-sectional angle here specifically matches the curvature of the end of the bottle preform manufacturing cavity 103, and the bottom length is no more than 5mm longer than the top length, thereby avoiding scratches and damage to the end of the formed bottle preform, and scraping off the molten material remaining at the end, ensuring the beauty of the end of the bottle preform and avoiding material waste.

[0049] As an embodiment of the present invention, refer to Figures 5 to 7 , the rear sides of the two blow molding templates 101 are both provided with evenly distributed cooling pipes 108, and the spacing between the bottom cooling pipe 108 and the matching groove 106 is 10-15mm. By setting the numerical value here, heat can be quickly transferred, and the cooling pipe 108 is set in a "U" shape. The cold water inlet of the cooling pipe 108 is always at the end away from the matching groove 106. When cooling the blow molding template 101, cold water enters through the top of the "U"-shaped cooling pipe 108. After the cold water absorbs the heat of the blow molding template 101, it becomes hot water. At this time, the hot water flows through the bottom of the "U"-shaped cooling pipe 108, and the bottom is only 10-15mm away from the feeding pipe 107 installed in the matching groove 106. Therefore, the heat of the hot water can be used to keep the molten material in the feeding pipe 107 warm, so as to prevent it from cooling and solidifying when not feeding, thereby affecting the subsequent feeding speed and feeding uniformity.

[0050] As an embodiment of the present invention, refer to Figure 6 The surfaces of the two second mold surfaces 104 are both provided with evenly distributed exhaust grooves 109, which are trapezoidal in shape, and the relatively small end of the exhaust groove 109 is connected to the blow molding cavity 105. The setting of small front and large back can increase the exhaust volume and make cleaning more convenient. For impurities that are not sticky, they can fall out in a vertical state by converting the mold surface.

[0051] Working principle: Set the original state of the plastic bottle blow molding mold as follows Figure 1As shown, the core rod is placed at the center positioning point of the mold surface. First, the top and bottom cylinders 201 drive the two correspondingly connected "U"-shaped plates 204 to move toward each other, thereby pulling the two side plates 203 and the two blow molding templates 101 connected to the side plates 203 to move toward each other. When the bottom blow molding template 101 reaches the mold surface, the top blow molding template 101 arrives thereafter and contacts with the bottom blow molding template 101, as shown in FIG. Figure 2 As shown, the molten plastic material enters the preform manufacturing cavity 103 through the feeding pipe 107. After filling, the preform is cooled by cold water through the cooling pipe 108, but still maintained at a certain temperature. At this time, the first mold surface 102 is molded and the preform is manufactured;

[0052] Next, the top cylinder 201 drives the top "U"-shaped plate 204 to move upward. At this time, the rebound force generated by the top spring 202 pulls the top side plate 203 to move upward synchronously with the "U"-shaped plate 204 until it reaches the original position. At the same time, the bottom cylinder 201 drives the bottom "U"-shaped plate 204 and the bottom side plate 203 to move downward until the bottom side plate 203 contacts the bottom spring 202, completing the opening of the two first mold surfaces 102. As the two "U"-shaped plates 204 continue to move back to back, the spring 202 generates a force that resists the movement of the "U"-shaped plate 204, thereby causing the "U"-shaped plate 204 to drive the limiting slide plate 2 05 slides in the limiting slide groove 206, and while the "U"-shaped plate 204 slides, the matching plate 303 fixedly connected to the "U"-shaped plate 204 moves synchronously, and the "L"-shaped control link 302 limited by the control slide groove 304 on the surface of the matching plate 303 moves along with it, and makes a 90° rotation with the center point of the connecting column 301 as the center of the circle, thereby driving the blow molding template 101 to rotate synchronously, so that the second mold surface 104 rotates to the position of the original first mold surface 102, and the electric telescopic rod 305 is extended at this time to limit the limiting slide plate 205, and the flipping and switching of the first mold surface 102 and the second mold surface 104 is completed at this time, as shown in FIG. Figure 3 As shown;

[0053] Then, the top and bottom cylinders 201 drive the two correspondingly connected "U"-shaped plates 204 to move toward each other, so that the second mold surface 104 can be molded. Figure 4 As shown, at this time, the preform in the blow molding cavity 105 is blow molded by high-pressure injection molding to form it;

[0054] Finally, the top and bottom cylinders 201 drive the two correspondingly connected "U"-shaped plates 204 to move back and forth so that the two blow molding templates 101 move to Figure 3At the position shown, the second mold surface 104 is opened, and the electric telescopic rod 305 is retracted. The two cylinders 201 drive the two "U"-shaped plates 204 to move toward each other. During the movement, the "L"-shaped control connecting rod 302 is rotated 90° again with the movement, so that the second mold surface 104 and the first mold surface 102 are flipped and switched to return to the original state.

[0055] The main advantages and working principles of the embodiments of the present invention have been explained above. Then, as a person skilled in the art, it should be understood that the above embodiments are not intended to be limiting conditions of the present invention. Various changes, modifications, substitutions and variations may be made without departing from the principles, spirit and scope of the invention. These changes, modifications, substitutions and variations should all fall within the scope of protection of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A plastic bottle blow molding mold, comprising a mounting frame (100), characterized in that: A blow molding template (101) symmetrical in top and bottom is arranged inside the mounting frame (100); a first mold surface (102) and a second mold surface (104) are respectively arranged on opposite sides and front sides of the two blow molding templates (101); the surfaces of the two first mold surfaces (102) are provided with evenly distributed preform manufacturing cavities (103); the surfaces of the two second mold surfaces (104) are provided with evenly distributed blow molding cavities (105); the number of the preform manufacturing cavities (103) and the blow molding cavities (105) are equal, and the center line positions of the front sides of the preform manufacturing cavities (103) and the blow molding cavities (105) are correspondingly arranged; and the left and right sides of the two blow molding templates (101) are provided with lifting and flipping mechanisms symmetrically arranged in top and bottom; The lifting and flipping mechanism comprises a lifting mechanism (200) and a flipping mechanism (300). The lifting mechanism (200) and the flipping mechanism (300) are used to respectively complete the corresponding mold surface closing and mold opening of the first mold surface (102) and the second mold surface (104) when driving the two blow molding templates (101) to move toward each other, and when the two blow molding templates (101) move away from each other to a specified height, the mold surface switching and flipping of the first mold surface (102) and the second mold surface (104) are completed while moving.

2. The plastic bottle blow molding mold according to claim 1, characterized in that: The lifting mechanism (200) comprises a cylinder (201), a spring (202), a side plate (203), a "U"-shaped plate (204), a limiting slide plate (205) and a limiting slide groove (206); the side plate (203) is located on the left and right sides of the blow molding template (101); the "U"-shaped plate (204) is slidably connected to the outer side of the side plate (203); the output end of the cylinder (201) is fixedly connected to the "U"-shaped plate (204); the other end of the cylinder (201) is fixedly connected to the bottom of the mounting frame (100); the spring (202) is symmetrically arranged; one end of the top and bottom springs (202) are both fixedly connected to the mounting frame (100); the other end of the top spring (202) is fixedly connected to the corresponding side plate (203); and the other end of the bottom spring (202) is movably connected to the corresponding side plate (203).

3. The plastic bottle blow molding mold according to claim 2, characterized in that: The limiting slide plate (205) is symmetrically arranged and fixedly connected to one side of the "U"-shaped plate (204); the limiting slide groove (206) is arranged on the outer side of the side plate (203) and its position corresponds to the limiting slide plate (205); the central axis of the cylinder (201) coincides with the central axis of the side plate (203).

4. The plastic bottle blow molding mold according to claim 2, characterized in that: The telescopic speed of the bottom cylinder (201) is 1.2-1.3 times that of the top cylinder (201), and the bottom blow molding template (101) always reaches the mold closing point 2-3S earlier than the top blow molding template (101).

5. The plastic bottle blow molding mold according to claim 2, characterized in that: The flip mechanism (300) comprises a connecting column (301), an "L"-shaped control link (302), a matching plate (303), a control slide (304) and an electric telescopic rod (305). The connecting column (301) is fixedly connected to the left and right sides of the blow molding template (101) and passes through the center point of the side plate (203). The "L"-shaped control link (302) is fixedly connected to the outer end of the connecting column (301). The matching plate (303) is fixedly connected to the "U"-shaped plate (204). The outer side of the matching plate (303) is provided with a control slide (304) corresponding to the outer end of the "L"-shaped control link (302). The electric telescopic rod (305) is located in the inner cavity of the two control slides (304) at the bottom. The electric telescopic rod (305) is used to limit the limit slide plate (205) after the first mold surface (102) is converted to the second mold surface (104).

6. The plastic bottle blow molding mold according to claim 5, characterized in that: The left side cross-sections of the two blow moulding templates (101) are arranged in a square shape, and the connecting column (301) is located at the center point of the side of the blow moulding template (101).

7. The plastic bottle blow molding mold according to claim 1, characterized in that: The surface of the first mold surface (102) is provided with evenly distributed matching grooves (106), the matching grooves (106) and the preform manufacturing cavity (103) are equal in number and corresponding in position, the inner cavity of the matching groove (106) at the top is provided with a feeding pipe (107), and the diameter of the matching groove (106) at the bottom is 1.2-1.3 times that of the matching groove (106) at the top.

8. The plastic bottle blow molding mold according to claim 7, characterized in that: The discharge port of the feeding pipe (107) is arranged in a semicircular arc, and the bottom length is greater than the top length. The bottom of the discharge end of the feeding pipe (107) is arranged to be thin at the front and thick at the back, and the cross-sectional angle is 30°-45°.

9. The plastic bottle blow molding mold according to claim 6, characterized in that: The rear sides of the two blow molding templates (101) are both provided with uniformly distributed cooling pipes (108), the spacing between the cooling pipes (108) and the matching grooves (106) at the bottom is 10-15 mm, the cooling pipes (108) are arranged in a "U" shape, and the cold water inlet of the cooling pipes (108) is always at the end away from the matching grooves (106).

10. The plastic bottle blow molding mold according to claim 5, characterized in that: The surfaces of the two second mold surfaces (104) are both provided with evenly distributed exhaust grooves (109), the exhaust grooves (109) are arranged in a trapezoidal shape, and a relatively small end of the exhaust groove (109) is connected to the blow molding cavity (105).

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