CN107297884B - Blow mold opening and closing device and blow molding machine - Google Patents
Blow mold opening and closing device and blow molding machine Download PDFInfo
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- CN107297884B CN107297884B CN201710658425.5A CN201710658425A CN107297884B CN 107297884 B CN107297884 B CN 107297884B CN 201710658425 A CN201710658425 A CN 201710658425A CN 107297884 B CN107297884 B CN 107297884B
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- blow
- mold opening
- blow mold
- closing device
- mold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/56—Opening, closing or clamping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/28—Blow-moulding apparatus
- B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
- B29C49/36—Blow-moulding apparatus having movable moulds or mould parts rotatable about one axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
- B29C49/04104—Extrusion blow-moulding extruding the material discontinuously
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention provides a blow mold opening and closing device and a blow molding machine, and belongs to the technical field of plastic processing. It has solved the not enough problem of current blowing mould opening and shutting device structure kind. The blow mold opening and closing device comprises a guide rod, two mold mounting plates arranged in parallel relatively, an oil cylinder and a synchronous rack and pinion mechanism; the two die mounting plates are connected with the guide rod in a sliding manner, and the guide rod is fixedly connected with a mounting seat; the synchronous gear rack mechanism is provided with a gear and two racks which are meshed with the gear, the two racks are fixedly connected with the two die mounting plates in a one-to-one correspondence manner, and the gear is rotationally connected with the mounting seat; the cylinder body of the oil cylinder is fixedly connected with one of the die mounting plates, and the piston rod is fixedly connected with the other die mounting plate. The blow mold opening and closing device can adjust the mold closing force by adjusting the oil pressure, so that the mold closing force is matched with the mold, the attractiveness of the product is improved, and the bottom sealing qualification rate of the product is improved; but also has the advantage of convenient adjustment.
Description
Technical Field
The invention belongs to the technical field of plastic processing, and relates to a mold opening and closing device, in particular to a blow mold opening and closing device.
The invention belongs to the technical field of plastic processing, and relates to a mold opening and closing device, in particular to a blow molding machine.
Background
The plastic bottle is a plastic container which is formed by using Polyester (PETG), polyethylene (PE) and polypropylene (PP) as raw materials, adding corresponding organic solvents, heating at high temperature, and performing bottle blank blow molding, extrusion blow molding or injection molding through a plastic mold. The plastic bottle is mainly used for liquid or solid disposable plastic packaging containers such as beverages, foods, pickles, honey, dried fruits, edible oil, agricultural and veterinary drugs and the like.
In the process of manufacturing the plastic bottle by adopting the extrusion blow molding process, firstly, the plastic tube strip is molded by adopting an extruding machine and cut into the plastic tube strip with the proper length suitable for the processing of the blow molding machine, then the plastic tube strip is put into a mold of the blow molding machine for blow molding, and finally, the plastic tube strip is taken out from the mold to separate the product and the waste. The existing extrusion blow molding process has the problems of low automation degree, more workers and high labor intensity. In order to improve the production efficiency and reduce the number of workers, a robot-assisted processing scheme is adopted, namely a robot is adopted to replace some procedures, but the production efficiency still cannot meet part of customer requirements.
The multilayer container contains ethylene vinyl alcohol copolymer which is not suitable for recycling, so that the reduction of the amount of waste material is also a technical problem to be solved by the person skilled in the art.
In order to open and close the mold, those skilled in the art have proposed various mold opening and closing devices. For example, the Chinese patent document describes a jaw type mold opening and closing mechanism of a plastic extrusion and stretch blow molding machine (publication number CN 1693049A), a mold opening and closing mechanism of a plastic stretch blow molding machine (publication number CN 100534764C), and a mold opening and closing mechanism of a plastic stretch blow molding machine (publication number CN 2923279Y). Those skilled in the art will appreciate that there are many more blow mold opening and closing devices of different configurations to meet the needs of different customers.
Disclosure of Invention
The invention provides a blow mold opening and closing device, and aims to solve the technical problem of how to provide a blow mold opening and closing device with another structure.
The invention provides a blow molding machine, and aims to improve the efficiency of extruding and blow molding containers of the blow molding machine.
The technical problem to be solved by the invention can be realized by the following technical scheme: the blow mold opening and closing device comprises a guide rod and two mold mounting plates which are arranged in parallel relatively; the two die mounting plates are in sliding connection with the guide rod, and the guide rod is fixedly connected with a mounting seat; the blow mold opening and closing device also comprises an oil cylinder and a synchronous gear rack mechanism; the synchronous gear rack mechanism is provided with a gear and two racks which are meshed with the gear, the two racks are fixedly connected with the two die mounting plates in a one-to-one correspondence manner, and the gear is rotationally connected with the mounting seat; the cylinder body of the oil cylinder is fixedly connected with one of the die mounting plates, the piston rod is fixedly connected with the other die mounting plate, or the cylinder body of the oil cylinder is fixedly connected with the mounting seat, and the piston rod is fixedly connected with one of the die mounting plates.
When the blow mold opening and closing device is installed, the blow mold opening and closing device can be connected with other mechanisms by adopting the installation seat and can also be connected with other mechanisms by adopting the guide rod. The blow mold comprises a left half mold and a right half mold, wherein the left half mold is fixed on one mold mounting plate, and the right half mold is fixed on the other mold mounting plate. This blowing mould device that opens and shuts makes blowing mould's left half mould and right half mould parallel open and shut, can improve the mould like this and coincide nature when being in the compound die state, and then improve the product and locate the roughness, improve product appearance aesthetic property and debug the mould more easily at the joint line, guarantee the qualification rate of container bottom leakproofness, have the more convenient advantage of messenger's mould installation debugging promptly.
The synchronous gear rack mechanism in the blow molding mold opening and closing device enables the left half mold and the right half mold to synchronously move, so that the left half mold and the right half mold can be simultaneously contacted with a plastic blank.
The blow mold opening and closing device is driven by the oil cylinder, and further has the advantages of smooth and stable movement of the left half mold and the right half mold. The blow mold opening and closing device can further improve the smoothness and stability of the movement of the left half mold and the right half mold by controlling the oil inlet and outlet speed of the oil cylinder, and particularly can ensure the highest qualified rate of the sealing property of the bottom of the extrusion blow molded container by controlling the mold closing stage speed of the left half mold and the right half mold. In other words, the blow molding mold opening and closing device effectively avoids the problem that the mold breaks the plastic blank to cause the sealing failure of the bottom of the container due to the excessively high mold closing speed; and effectively avoids the problem of sealing failure of the bottom of the container caused by incomplete extrusion of the plastic blank due to too low mold closing speed.
The blow molding machine comprises a rack, a turntable and a plurality of groups of blow mold opening and closing devices, wherein the turntable is rotationally connected with the rack, the plurality of groups of blow mold opening and closing devices are circumferentially distributed around an axial core line of the turntable, and the plurality of groups of blow mold opening and closing devices are connected with the turntable through radial guide structures which can enable the blow mold opening and closing devices to move along the radial line of the turntable; the blow mold opening and closing devices are connected with the frame through a ring-shaped guide structure with a group of guide tracks; the guide track line has a straight line segment therein.
The number of the blow mold opening and closing devices in the blow molding machine can be flexibly set according to the required yield of products. The rotary table in the blow molding machine can be horizontally arranged, and the guide rod is vertically arranged; the blow molding machine with the arrangement mode has the advantages of convenience in mold dismounting and maintenance. The rotary table in the blow molding machine can also be vertically arranged, and the guide rod is horizontally arranged; the blow molding machine with the arrangement mode has the advantages of small occupied area, high qualification rate of the sealing property of the bottom of the container and easier demolding of products.
The plurality of blow mold opening and closing devices are respectively in different states, namely, a part of the blow mold opening and closing devices are in a mold closing state, a part of the blow mold opening and closing devices are in a mold opening state, a part of the blow mold opening and closing devices are in a mold closing to mold opening process and a part of the blow mold opening and closing devices are in a mold opening to mold closing process. In the blow molding machine, a pair of molds rotate for a circle along a shaft core line of a turntable just to complete the mold opening state, the mold closing state and the mold opening state; the time required for making a pair of dies rotate for one circle along the axis line of the turntable is the same as the time required for processing a group of products by controlling the rotating speed of the turntable.
In the blow mold opening and closing device, the oil cylinder comprises a piston seat, one end part of an inner cavity in the oil cylinder is provided with a buffer sleeve, one end of the buffer sleeve is hermetically connected with the inner side surface of the inner cavity in the oil cylinder, and one end surface of the inner cavity in the oil cylinder at the other end of the buffer sleeve is hermetically and fixedly connected; an oil port in the oil cylinder is communicated with a cavity between the outer side surface of the buffer sleeve and the inner side surface of the inner cavity in the oil cylinder, a plurality of throttling holes are formed in the side wall of the buffer sleeve and are arranged along the axial core line direction of the buffer sleeve, and the cross section areas of the throttling holes are gradually reduced from one end of the buffer sleeve to the other end; one end of the piston seat is provided with a buffer core column which can penetrate into the buffer sleeve; when the blow mold opening and closing device is in a mold closing state, the buffer core column is positioned in the buffer sleeve. The oil cylinder enables the speed of the blow mold opening and closing device to be gradually reduced at the stage that the mold is close to the closed state, the speed of the mold opening initial stage is gradually increased, and the piston rod can move at a constant speed at the other stages, so that gradual mold closing and gradual mold opening are realized, and the oil cylinder has the advantages of being small in mold closing noise, avoiding the phenomenon that plastic blanks are broken by mold closing, effectively ensuring the bottom sealing performance of a container and the like; meanwhile, the phenomenon that the product is subjected to traction deformation or tearing damage due to instant die opening is avoided.
Compared with the prior art, the blow mold opening and closing device can adjust the mold closing force by adjusting the oil pressure, so that the mold closing force is matched with the mold, the attractiveness of the product is improved, and the bottom sealing qualified rate of the product is improved; but also has the advantage of convenient adjustment.
The blow mold opening and closing device has the advantages of low noise, convenient operation and control, simple structure and high product bottom sealing qualification rate.
The blow molding machine is matched with an extruding machine, and an extruding head of the extruding machine is arranged opposite to a mold parting and jointing surface arranged in a blow molding mold opening and closing device. The plastic embryo extruded by the plastic extruding machine is clamped by the mold in a mold closing state, and the mold is driven by the turntable to move, so that the plastic embryo is drawn and enters the mold from mold opening to mold closing. The rotary table of the blow molding machine continuously rotates, and the plastic blanks extruded by the plastic extruding machine continuously enter the blow molding machine, so that the plastic blanks do not need to be cut into sections, the working procedures of cutting, plastic blank transfer and the like are omitted, and the waste generation amount is reduced.
The blow molding machine has the advantages of improving the utilization rate of raw materials, improving the production efficiency of products and improving the qualification rate of the products.
Drawings
FIG. 1 is a schematic representation of the present blow mold and extruder. The structure is schematic.
Fig. 2 and 3 are schematic perspective views of the blow mold opening and closing device from different viewing angles.
Fig. 4 is a schematic front view of the blow mold opening and closing device.
Fig. 5 isbase:Sub>A schematic sectional structure view ofbase:Sub>A-base:Sub>A in fig. 4.
Fig. 6 is a schematic sectional view of the end of the cylinder.
Fig. 7 is a perspective view of the cushion cover.
Fig. 8 is a perspective view of the annular guide groove in the frame.
Fig. 9 is a schematic view showing a connection relationship between the frame, the blow mold opening and closing device, and the turntable.
Fig. 10 is a schematic view showing a connection relationship between the blow mold opening and closing device and the turntable.
In the figure, 1, a frame; 1a, a left frame; 1b, a right frame; 1c, an annular guide groove; 1c1, a straight line segment; 1c2, a circular arc section; 2. a turntable; 2a, a guide groove; 3. a blow mold opening and closing device; 3a, a guide rod; 3b, mounting a mould; 3c, a gear; 3d, a rack; 3e, an oil cylinder; 3e1, a cylinder body; 3e2, a piston rod; 3e3, a buffer sleeve; 3e4, orifice; 3e5, buffering the core column; 3e6, an oil port; 3f, mounting seats; 3g, a weight lever; 4. a blow mold; 5. a slider; 6. a plastic extruding machine; 6a, extrusion head.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 10, the blow molding machine includes a frame 1, a turntable 2, and a plurality of sets of blow mold opening and closing devices 3.
The frame 1 may be placed on the ground. The turntable 2 is vertically arranged, the rack 1 comprises a left frame 1a and a right frame 1b, the turntable 2 and the multiple groups of blow mold opening and closing devices 3 are positioned between the left frame 1a and the right frame 1b, two ends of the turntable 2 are respectively connected with the left frame 1a and the right frame 1b through bearings in a rotating manner, and one ends of the multiple groups of blow mold opening and closing devices 3 are connected with the left frame 1a through a group of annular guide structures with guide track lines in an annular shape; the other ends of the plural sets of blow mold opening and closing devices 3 are connected to the right frame 1b through an annular guide structure having a set of guide tracks. The turntable 2 comprises a left turntable body and a right turntable body, and one end parts of the multiple groups of blow mold opening and closing devices 3 are connected with the left turntable body through radial guide structures which can enable the blow mold opening and closing devices 3 to move along the radial line of the turntable 2; the other end parts of the multiple sets of blow mold opening and closing devices 3 are connected with the right plate body through radial guide structures which can enable the blow mold opening and closing devices 3 to move along the radial line of the turntable 2. The arrangement structure not only effectively improves the overall firmness of the blow molding machine, but also effectively improves the motion stability of the turntable 2 and the blow mold opening and closing device 3. Meanwhile, the arrangement structure enables a certain space to be generated between the left tray body and the right tray body, and the space can be used for arranging control parts of the blow mold opening and closing device 3.
As shown in fig. 2 to 7, the blow mold opening and closing device 3 includes a guide rod 3a, a mold mounting plate 3b, a timing rack and pinion mechanism, and an oil cylinder 3e.
The two die mounting plates 3b are arranged in parallel, and the die mounting plates 3b are perpendicular to the guide rods 3 a. The guide rods 3a penetrate through the die mounting plate 3b, the number of the guide rods 3a is two, and the two guide rods 3a are arranged in parallel; the two guide rods 3a are fixedly connected through a plurality of mounting seats 3 f; both the mold mounting plates 3b can slide stably with respect to the guide rods 3 a.
The oil cylinder 3e is positioned between the two guide rods 3a, and a piston rod 3e2 of the oil cylinder 3e is arranged in parallel with the guide rods 3 a. The cylinder body 3e1 of the oil cylinder 3e is positioned at one side of one of the die mounting plates 3b, and the cylinder body 3e1 of the oil cylinder 3e is fixedly connected with the mounting seat 3 f; the piston rod 3e2 penetrates through the die mounting plate 3b and is fixedly connected with the other die mounting plate 3 b; this arrangement can reduce the overall length of the blow mold opening and closing device 3 and bring the center of gravity of the blow mold opening and closing device 3 closer to the center of the guide rod 3 a; the stability of the movement of the turntable 2 and of the blow mold opening and closing device 3 is further improved.
The synchronous gear rack mechanism comprises a gear 3c and two racks 3d which are meshed with the gear 3 c; the gear 3c is positioned between the two die mounting plates 3b, and the gear 3c is rotatably connected with the mounting seat 3f through a bearing; the two racks 3d are fixedly connected with the two die mounting plates 3b in a one-to-one correspondence manner.
One end of the mold mounting plate 3b is used for fixing the blow mold 4, and the other end of the mold mounting plate 3b is fixed with a weight lever 3g. The blow mold 4 comprises a left half mold and a right half mold, and the left half mold and the right half mold are respectively fixed on the two mold mounting plates 3 b; the blow mold 4 is positioned at one side of the guide rod 3a, and the balance weight rod 3g and the synchronous gear rack mechanism are positioned at the other side of the guide rod 3 a; this arrangement brings the center of gravity of the blow mold opening and closing device 3 closer to the center of the guide rod 3 a; and further improve the motion stability of the turntable 2 and the blow mold opening and closing device 3. Meanwhile, by adjusting the positions of the counterweight rods 3g, when the blow mold 4 is in a mold closing state, the end surfaces of the two counterweight rods 3g just abut against each other; in other words, the weight bar 3g also has an auxiliary limiting function, so as to prevent the blow mold 4 from breaking the plastic blank extruded by the extruder 6.
A buffer sleeve 3e3 is arranged at one end part of an inner cavity in the oil cylinder 3e, one end of the buffer sleeve 3e3 is hermetically connected with the inner side surface of the inner cavity in the oil cylinder 3e, and one end surface of the inner cavity in the oil cylinder 3e at the other end of the buffer sleeve 3e3 is hermetically and fixedly connected; an oil port 3e6 in the oil cylinder 3e is communicated with a cavity between the outer side surface of the buffer sleeve 3e3 and the inner side surface of the inner cavity in the oil cylinder 3e, a plurality of throttle holes 3e4 arranged along the axial core line direction of the buffer sleeve 3e3 are formed in the side wall of the buffer sleeve 3e3, and the cross sectional areas of the throttle holes 3e4 are gradually reduced from one end of the buffer sleeve 3e3 to the other end. The oil cylinder 3e comprises a piston seat, and one end of the piston seat is provided with a buffer core column 3e5 which can penetrate into the buffer sleeve 3e 3; the cushion cylinder 3e5 is located in the cushion cover 3e3 when the blow mold opening and closing device 3 is in the mold clamping state.
As shown in fig. 1, 8 to 10, the drawings in the specification show that the blow molding machine includes 12 sets of blow mold opening and closing devices 3; the number of blow mold opening and closing devices 3 can be increased or decreased in an adaptable manner according to the actual requirements. The sets of blow mold opening and closing devices 3 are circumferentially distributed around the axis line of the turntable 2. The radial guide structure comprises guide grooves 2a arranged on the turntable 2, the number of the guide grooves 2a is the same as that of the blow mold opening and closing devices 3, the guide grooves 2a are arranged along the radial line of the turntable 2, and sliding parts 5 are arranged in the guide grooves 2 a; the sliders 5 are connected to the mounting seats 3f of the blow mold opening and closing device 3 so as to be swingable in a one-to-one correspondence.
The annular guide structure comprises an annular guide groove 1c positioned on the rack 1, namely, the left frame 1a and the right frame 1b are both provided with an annular guide groove 1c; one end of each guide rod 3a of the blow mold opening and closing device 3 penetrates into one annular guide groove 1c; to increase the sliding flexibility, the ends of the guide rods 3a may be provided with rolling elements. The structure has the advantages of simple structure and flexible and stable movement.
The annular guide groove 1c is provided with a section of straight line section 1c1, and the rest are circular arc sections 1c2. The attached drawings of the specification show that the plastic blank extruder is also positioned on the front side of the blow molding machine, the straight line section 1c1 is positioned on the front side part of the blow molding machine, the straight line section 1c1 enables the blow molding die opening and closing devices 3 to move linearly, and therefore the coincidence of the center lines of the plastic blank and the blow molding die 4 is guaranteed, and the product quality and the qualified rate are improved.
The principle of the blow mold opening and closing device 3 and the blow molding machine, and the function and advantages of the individual components, are further explained by way of illustration of the continuous production of containers by means of a plastic parison extruder and a blow molding machine: the left half mould and the right half mould of the blow mould 4 matched with the container are respectively fixed on the two mould mounting plates 3 b; in other words, a pair of blow molds 4 is fixed to each set of blow mold opening and closing devices 3.
The turntable 2 is in transmission connection with a driving piece; the driving member drives the turntable 2 to rotate continuously and stably at a constant speed in the direction indicated by the arrow in fig. 1. The rotary table 2 forces the blow mold opening and closing device 3 to move along the annular guide groove 1c, and the radial guide structure can enable the blow mold opening and closing device 3 to move along the circular arc section 1c2 and also enable the blow mold opening and closing device 3 to move along the straight line section 1c 1; the blow mold opening and closing device 3 moves from the bottom upward in the straight section 1c 1. The straight line section 1c1 is simultaneously provided with a plurality of groups of blow mold opening and closing devices 3, and the adjacent distance between the blow mold opening and closing devices 3 positioned in the straight line section 1c1 is smaller than the adjacent distance between the blow mold opening and closing devices 3 positioned in the circular arc section 1c2.
The blow mold opening and closing device 3 located on the straight line segment 1c1 is located above the extrusion head 6a in the plastic parison extruder. For convenience of description, the uppermost blow mold opening and closing device 3 in the straight line segment 1c1 is defined as a first station blow mold opening and closing device 3, and a blow mold 4 installed in the first station blow mold opening and closing device 3 is defined as a first station blow mold 4; the lowest blow mold opening and closing device 3 in the straight line section 1c1 is a third station blow mold opening and closing device 3, and a blow mold 4 installed in the third station blow mold opening and closing device 3 is a third station blow mold 4; the blow mold opening and closing device 3 located between the first station blow mold opening and closing device 3 and the third station blow mold opening and closing device 3 is the second station blow mold opening and closing device 3, and the blow mold 4 installed in the second station blow mold opening and closing device 3 is the second station blow mold 4.
Each blow mould device 3 that opens and shuts can independently be controlled, and first station blow mould 4 and second station blow mould 4 are in the compound die state, and third station blow mould 4 is in from the die sinking to compound die in-process, and the plastics embryo is by vertical upwards traction from this, and then can guarantee the coincidence of the central line of plastics embryo and third station blow mould 4, and then improve the quality and the qualification rate of product.
The product can be subjected to blow molding in the first station blow mold opening and closing device 3; the blow mold 4 sequentially performs a cooling process, a mold closing to mold opening process, and a mold opening to mold closing process from the first station to the third station along the rotation direction of the turntable 2. The lowermost mold opening and closing device 3 positions the blow molds 4 in the mold-opened state, so that the product can be more easily released by gravity.
Since the blow mold opening and closing devices 3 located in the straight line segment 1c1 are closely spaced, less scrap is generated. And then because the distance between the two adjacent blow mold opening and closing devices 3 from the straight line section 1c1 to the circular arc section 1c2 is increased, the plastic blank positioned between the adjacent blow mold opening and closing devices 3 is pulled out and broken, thereby realizing the demolding one by one.
In the process from the third station to the second station, a buffer core column 3e5 of the oil cylinder 3e penetrates into a buffer sleeve 3e3, and the movement speed of a piston rod 3e2 is gradually reduced until the die assembly is completed; the mode of die assembly can obviously improve the consistency of the bottom of a product, the sealing qualification rate of the bottom seal and reduce noise. In the initial stage from mold closing to mold opening, the buffer core column 3e5 of the oil cylinder 3e gradually slides out of the buffer sleeve 3e3, the movement speed of the piston rod 3e2 is gradually increased, and further the deformation or tearing probability of a product in the mold opening process is remarkably reduced. The oil cylinder 3e moves at a constant speed in other periods, so that the die opening and closing efficiency is effectively ensured.
Example two
The structure and principle of the present embodiment are substantially the same as those of the first embodiment, and the substantially same parts are not described redundantly, but only different parts are described, and the different parts are: the turntable 2 is arranged horizontally.
EXAMPLE III
The structure and principle of the present embodiment are substantially the same as those of the first embodiment, and the description of the parts that are substantially the same is not repeated, but only different parts are described, and the different parts are as follows: a cylinder body 3e1 of the oil cylinder 3e is fixedly connected with one of the mould mounting plates 3b, and a piston rod 3e2 is fixedly connected with the other mould mounting plate 3 b.
Example four
The structure and principle of the present embodiment are substantially the same as those of the first embodiment, and the description of the parts that are substantially the same is not repeated, but only different parts are described, and the different parts are as follows: the radial guide structure comprises guide pillars fixed on the turntable 2, the axial lead of the guide pillars coincides with the radial line of the turntable 2, the number of the guide pillars is the same as that of the blow mold opening and closing devices 3, sliding sleeves are sleeved on the guide pillars, and the sliding sleeves are rotationally connected with mounting seats 3f in the blow mold opening and closing devices 3 in a one-to-one correspondence manner.
Claims (7)
1. A blow mold opening and closing device comprises a guide rod (3 a), an oil cylinder (3 e), a synchronous gear rack mechanism and two mold mounting plates (3 b) which are arranged in parallel relatively; the two die mounting plates (3 b) are connected with the guide rod (3 a) in a sliding manner, the synchronous gear rack mechanism is provided with a gear (3 c) and two racks (3 d) which are meshed with the gear (3 c), the two racks (3 d) are fixedly connected with the two die mounting plates (3 b) in a one-to-one correspondence manner, and the gear (3 c) is rotationally connected with the first mounting seat; the device is characterized in that the first mounting seat is fixedly connected with the guide rod (3 a); one end of the mold mounting plate (3 b) is used for fixing a blow mold (4), the other end of each mold mounting plate (3 b) is fixed with a counterweight rod (3 g), one end of the mold mounting plate (3 b) is positioned on one side of the guide rod (3 a), and the counterweight rod (3 g) and the synchronous gear rack mechanism are positioned on the other side of the guide rod (3 a);
the cylinder body (3 e 1) of the oil cylinder (3 e) is fixedly connected with one of the die mounting plates (3 b), the piston rod (3 e 2) is fixedly connected with the other die mounting plate (3 b), or the cylinder body (3 e 1) of the oil cylinder (3 e) is fixedly connected with the mounting seat, and the piston rod (3 e 2) is fixedly connected with one of the die mounting plates (3 b);
the oil cylinder (3 e) comprises a piston seat, one end part of an inner cavity in the oil cylinder (3 e) is provided with a buffer sleeve (3 e 3), one end of the buffer sleeve (3 e 3) is hermetically connected with the inner side surface of the inner cavity in the oil cylinder (3 e), and one end surface of the inner cavity in the oil cylinder (3 e) at the other end of the buffer sleeve (3 e 3) is hermetically and fixedly connected; a cavity between an oil port (3 e 6) in the oil cylinder (3 e) and the outer side surface of the buffer sleeve (3 e 3) and the inner side surface of the inner cavity in the oil cylinder (3 e) is communicated, a plurality of throttle holes (3 e 4) arranged along the axial core line direction of the buffer sleeve (3 e 3) are formed in the side wall of the buffer sleeve (3 e 3), and a buffer core column (3 e 5) capable of penetrating into the buffer sleeve (3 e 3) is arranged at one end of the piston seat; when the blow mold opening and closing device (3) is in a mold closing state, the buffer core column (3 e 5) is positioned in the buffer sleeve (3 e 3).
2. A blow mold opening and closing device according to claim 1, characterized in that the cross-sectional area of the plurality of throttle holes (3 e 4) is gradually decreased from one end of the cushion collar (3 e 3) to the other end thereof.
3. A blow mold opening and closing device according to claim 1, characterized in that the number of guide rods (3 a) is two, the two guide rods (3 a) being arranged in parallel; the two guide rods (3 a) are fixedly connected through a plurality of second mounting seats.
4. A blow mold opening and closing device according to claim 3, characterized in that the cylinder (3 e) is located between two guide rods (3 a), the piston rod (3 e 2) of the cylinder (3 e) being arranged parallel to the guide rods (3 a).
5. A blow mould opening and closing device according to claim 1, characterised in that the gear wheel (3 c) is located between two mould mounting plates (3 b).
6. A blow mold opening and closing apparatus according to claim 1, characterized in that the blow mold (4) is fixed to the mold mounting plate (3 b), and end surfaces of the two weight levers (3 g) abut when the blow mold (4) is in a mold clamping state.
7. A blow molding machine, including the stander (1), characterized by that, this blow molding machine also includes the rotary table (2) and multiunit blow mold opening and closing device (3) of any one of claims 1 to 6, the rotary table (2) is connected with stander (1) rotatably, multiunit blow mold opening and closing device (3) distribute circumferentially around the axial core line of the rotary table (2), the multiunit blow mold opening and closing device (3) and rotary table (2) are all connected through the radial guide structure that can make the blow mold opening and closing device (3) move along the radial line of the rotary table (2); the blow mould opening and closing devices (3) are connected with the frame (1) through an annular guide structure with a group of guide track lines; the guide track line has a straight line segment (1 c 1).
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| CN201710658425.5A CN107297884B (en) | 2017-08-04 | 2017-08-04 | Blow mold opening and closing device and blow molding machine |
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| CN107297884B true CN107297884B (en) | 2023-04-18 |
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| CN111452336B (en) * | 2020-04-10 | 2020-11-17 | 成都万友滤机有限公司 | Blow molding die for air guide pipe and blow molding method thereof |
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Address after: 318020 canned food industry zone, Huangyan District, Zhejiang, Taizhou Applicant after: TAIZHOU XIANGLONG FOOD CONTAINER TECHNOLOGY CO.,LTD. Address before: 318020 canned food industry zone, Huangyan District, Zhejiang, Taizhou Applicant before: SRLON PACKAGING TECHNOLOGY Co.,Ltd. |
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