A double station blow molding machine

Abstract

The invention relates to a double-station blow molding machine, which mainly comprises an extruding mechanism, a mold closing mechanism, a hydraulic system, a control system, a shifting mechanism, a support, a base, a die, etc., and is characterized in that the mold closing mechanism mainly comprises a fixed wall plate, two movable wall plates, a pull rod and a mold shifting mechanism to form a double-station mold closing mechanism; the wall plates are provided with rollers or sliding blocks below; the rollers or sliding blocks are provided with tracks below; the shifting mechanism drives the double-station mold closing mechanism to reciprocate on the tracks, so that the two mold closing mechanisms enter the working area alternately; the fixed wall plate is shared by the two mold closing mechanisms; the movable wall plates, the fixed wall plate and the fixed plate of the mold shifting mechanism are connected by the pull rod; the movable wall plates can move on the pull rod; or the fixed wall plate and the fixed plate of the mold shifting mechanism are connected by the pull rod, and the movable wall plates only move on the tracks.

Description

TECHNICAL FIELD

[0001] The present application belongs to the plastic processing industry, in particular to a double-station mold closing mechanism and a double-station blow molding machine. BACKGROUND

[0002] Generally, the mold closing mechanism of each blow molding machine has only one, and after blowing one product, the workpiece needs to be taken out after cooling, and then the second one is blown, which is low in work efficiency. In order to improve the efficiency, some people have invented a high-efficiency automatic hollow blow molding machine, patent number 201721020141.5 is two mold closing devices arranged on the same base to work back and forth, and two sets of mold closing devices work alternately, which indeed improves the work efficiency, but two sets of mold closing devices are arranged on the same base, the base is long, occupies a large area, and the manufacturing cost is also high. SUMMARY

[0003] The purpose of the present application is to provide a double-station mold closing mechanism and a blow molding machine with the double-station mold closing mechanism, which improves work efficiency and is low in cost and occupies a small area.

[0004] The purpose of the present application is achieved as follows:

[0005] A double-station blow molding machine mainly comprises an extrusion mechanism, a mold closing mechanism, a hydraulic system, a control system, a shifting mechanism, a support, a base, a die, etc., the mold closing mechanism mainly comprises a fixed wall plate, two movable wall plates, a pull rod, and a mold shifting mechanism to form a double-station mold closing mechanism, the wall plate is provided with rollers or sliding blocks below, and the rollers or sliding blocks are provided with tracks below, the shifting mechanism drives the double-station mold closing mechanism to move back and forth on the tracks, so that the two mold closing mechanisms work alternately in the working area; the fixed wall plate is shared by the two mold closing mechanisms, the movable wall plate, the fixed wall plate, and the fixed plate of the mold shifting mechanism are connected together by the pull rod, and the movable wall plate can move on the pull rod; or the fixed wall plate and the fixed plate of the mold shifting mechanism are connected together by the pull rod, and the movable wall plate only moves on the tracks.

[0006] The extrusion mechanism is arranged on a platform, the die discharges downward, the fixed molds of the two sets of molds are respectively arranged on the two sides of the fixed wall plate, and the movable molds are respectively arranged on the movable wall plates, one set of molds is used for blowing while the other set of molds is used for cooling and taking out the product, and the double-station mold closing mechanism and the extrusion mechanism share one set of hydraulic system and control system; the mold needs to be provided with a synchronous mold closing mechanism for the relative die of the fixed mold and the movable mold during blowing, and the double-station blow molding machine can share one set of synchronous mold closing mechanism, which comprises two racks and one gear, the gear is arranged in the gear seat and can rotate by being positioned by a shaft, one end of each of the two racks is fixed on one movable wall plate, and the other end of the rack enters the gear seat, and the mold in the working area is closed synchronously under the action of the gear and the rack.

[0007] The shifting mechanism includes a cylinder connected to the base, the piston rod of the cylinder is connected to the gear base of the mold closing mechanism, and the extension and retraction of the cylinder makes the two sets of molds work in turn under the die.

[0008] The pull rod is a cylindrical shaft, the middle section of the shaft is fixed with a shared fixed wall plate, each side of the fixed wall plate has a movable wall plate, both sides of the fixed wall plate have mold mounting positions, and the opposite sides of the two movable wall plates are provided with mold mounting positions.

[0009] The pull rod is a cylindrical shaft, the middle section of the shaft is fixed with a shared fixed wall plate, each side of the fixed wall plate has a movable wall plate, both sides of the fixed wall plate have mold mounting positions, and the opposite sides of the two movable wall plates are provided with mold mounting positions.

[0010] The pull rod is a cylindrical shaft, the middle section of the shaft is fixed with a shared fixed wall plate, each side of the fixed wall plate has a movable wall plate, both sides of the fixed wall plate have mold mounting positions, and the opposite sides of the two movable wall plates are provided with mold mounting positions.

[0011] The double-station blow molding machine has at least one set of synchronous centering mechanism for each mold and a die, and the centering mechanism includes two racks and a gear.

[0012] The extrusion mechanism and the track are basically perpendicular in the top view, the extrusion mechanism includes a head and a die, the extrusion mechanism has a front and rear movement function, and the extrusion mechanism of a large blow molding machine is further provided with a storage mechanism.

[0013] The outstanding advantages of the present application compared with the prior art are:

[0014] The double-station mold closing mechanism and the blow molding machine with the double-station mold closing mechanism of the present application have the advantages of high work efficiency, simple structure, convenient use and small floor space. The two sets of mold closing mechanisms of the present application share one synchronous mechanism, and the mold closing and mold moving actions are completed by using the same guide rail. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is one of the schematic diagrams of the double-station mold closing mechanism of the present application;

[0016] Figure 2 is one of the schematic diagrams of the double-station mold closing mechanism of the present application;

[0017] Figure 3 is the three-dimensional schematic diagram of the double-station mold closing mechanism of the present application; (the movable wall plate is not in contact with the pull rod)

[0018] Figure 4 is one of the three-dimensional schematic diagrams of the double-station mold closing mechanism of the present application; (the mold with the waterwheel type oxygen increasing machine ship-shaped float)

[0019] Figure 5 is the three-dimensional schematic diagram of the blow molding machine of the double-station mold closing mechanism of the present application;

[0020] Figure 6 is the schematic diagram of the synchronous structure of the present application;

[0021] Figure 7 is the schematic diagram of the connection structure of the pull rod and the fixed wall plate of the present application;

[0022] Figure 8 is the three-dimensional schematic diagram of the ship-shaped float of the present application;

[0023] Figure 9 is the cross-sectional schematic diagram of the ship-shaped float of the present application;

[0024] Figure 10 is the three-dimensional schematic diagram of the upper mold of the present application;

[0025] Figure 11 is the three-dimensional schematic diagram of the lower mold of the present application;

[0026] Figure 12 is the cross-sectional schematic diagram of the mold and the ship-shaped float of the present application.

[0027] In the figure: 1 - fixed wall plate; 2 - movable wall plate; 3 - fixed plate; 4 - pull rod; 5 - base; 6 - hydraulic cylinder; 7 - wire track; 8 - sliding block; 9 - track; 10 - roller; 11 - rack; 12 - gear; 13 - gear seat; 14 - connecting plate; 15 - piston rod; 16 - oil cylinder; 17 - oil cylinder seat; 18 - mold; 19 - support; 20 - platform; 21 - lifting mechanism; 22 - screw drive mechanism; 23 - barrel; 24 - material storage cylinder; 25 - material pressing cylinder; 26 - die; 27 - internal thread; 28 - external thread; 29 - hollow pipe; 30 - optical axis; 31 - boat-shaped float; 32 - upper panel; 33 - vertical plate; 34 - deck; 35 - groove; 36 - mounting hole; 37 - upper mold; 38 - lower mold. DETAILED DESCRIPTION

[0028] The application will be further described in connection with the drawings in which Figures 1-12 :

[0029] It should be noted that the features of the embodiments of the present application can be combined with each other without conflict. In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "fixedly connecting" should be understood in a broad sense, which can be fixed connection, or detachable connection, which can be direct connection, or indirect connection.

[0030] A double-station mold closing mechanism mainly comprises a wall plate, a pull rod 4, a mold moving mechanism, and a displacement mechanism. The wall plate is divided into a movable wall plate 2 and a fixed wall plate 1. A fixed wall plate 1, a movable wall plate 2, and a mold moving mechanism constitute a mold closing mechanism, which can also be called a station. The mold moving mechanism comprises a hydraulic mechanism and a fixed plate 3. Two mold closing mechanisms are combined into a double-station mold closing mechanism. The movable wall plate 2 is provided with a roller 10 or a sliding block 8 below. There is a track below the roller 10 or the sliding block 8. The displacement mechanism drives the double-station mold closing mechanism to move back and forth on the track, so that the two mold closing mechanism units enter the working area alternately. The double-station mold closing mechanism comprises two movable wall plates 2, a fixed wall plate 1, and two mold moving mechanisms. The fixed wall plate 1 can be shared by two mold closing mechanisms. The movable wall plate 2 and the fixed wall plate 1 can be connected together by the pull rod 4. The displacement mechanism can be an oil cylinder 16. The oil cylinder 16 is connected to the base 5 by the oil cylinder seat 17. The piston rod 15 of the oil cylinder 16 can be connected to the gear seat 13. The displacement mechanism drives the double-station mold closing mechanism to move on the track.

[0031] The pull rod 4 is a cylindrical shaft, the middle section of the shaft is fixed with the common fixed wall plate 1, and each side of the fixed wall plate 1 is provided with one movable wall plate 2. The fixed plate 3 of the mold moving mechanism is obliquely arranged on the pull rod 4, or the fixed plate 3 of the mold moving mechanism extends downward and is provided with a roller 10 or a sliding block 8 for supporting, and the movable wall plate 2 is positioned by the sliding block 8 without contacting the pull rod 4. The common fixed wall plate 1 is provided with mold installation positions on both sides, and the movable wall plate 2 is provided with mold installation positions on the opposite side of the common fixed wall plate 1, and the movable wall plate 2 moves back and forth under the action of the mold moving mechanism during work.

[0032] A double-station mold closing mechanism is provided at two opposite angles of the wall plate, at least one roller 10 is arranged under each movable wall plate 2, the roller 10 is arranged on the track 9 of the base 5, or the track of the base 5 is replaced by a wire track 7, the sliding block 8 is arranged on the wire track 7, and the wall plate is connected with the sliding block 8, so that the precision of the mold closing mechanism is further improved.

[0033] The pull rod 4 can be a cylindrical shaft, the middle section of the shaft is disconnected, one section of the shaft is provided with an external thread 28, the external thread 28 passes through the pull rod hole of the common fixed wall plate 1, the other section of the shaft is provided with an internal thread 27 at one end, the internal thread 27 is connected with the external thread to fix the pull rod and the common fixed wall plate 1, or the two sections of the shaft are provided with internal threads 27 at the section connected with the fixed wall plate, and the threads are connected with the stud arranged in the fixed wall plate.

[0034] As Figure 3 In the double-station mold closing mechanism, the movable wall plate does not contact the pull rod, the pull rod can be a smooth shaft 30 with external threads at both ends, the smooth shaft 30 passes through the fixed wall plate 1 and the fixed plate 3 of the mold moving mechanism, the hollow tube 29 is sleeved outside the smooth shaft between the fixed wall plate 1 and the fixed plate 3 of the mold moving mechanism to axially position the smooth shaft, and the both ends of the smooth shaft are fastened by nuts.

[0035] The common wall plate can be provided with misaligned pull rod holes, that is, two holes are misaligned on the pull rod hole of the common wall plate, and the two holes correspond to the left or right mold closing mechanism. The roller 10 or the sliding block 8 can be arranged only under each movable wall plate 2, or the roller 10 or the sliding block 8 can also be arranged under the common fixed wall plate 1, and the blow molding machine can also be provided with rollers or sliding blocks under the inclined bars.

[0036] The blow molding machine with a double-station mold closing mechanism comprises a support 19, a die 26, an extrusion mechanism, a hydraulic system and a control system, the installation position of the double-station mold closing mechanism is provided with a pair of molds 18, one of the molds 18 is used for cooling the workpiece of the other mold 18 during the blow molding work, the double-station mold closing mechanism and the extrusion mechanism can share one set of control system.

[0037] The double-station mold closing mechanism can share a set of synchronous centering mechanism with the die head 26, which comprises two racks 11 and a gear 12. The gear 12 is arranged in a gear seat 13 and can rotate by shaft positioning gear. One end of each of the two racks 11 is fixed on a movable wall plate 2, and the other end of the rack 11 enters the guide mechanism. The piston rod 15 of the displacement mechanism is connected to the gear seat 13 to drive the double-station mold closing mechanism to reciprocate on the track to make the two molds enter the working position alternately.

[0038] The extrusion mechanism is arranged substantially vertically to the track in plan view. The extrusion mechanism comprises a machine head and the die head 26. The extrusion mechanism has the function of moving forward and backward. The extrusion mechanism of the large blow molding machine is further provided with a storage mechanism. The storage mechanism is driven by a screw rod driving mechanism to extrude hot plastic into the storage mechanism. When the set amount is reached, the hot plastic is pressed out through the die head by a hydraulic cylinder to become a tubular parison. The tubular parison enters between the mold installed between the fixed wall plate and the movable wall plate. After the mold is synchronously closed, compressed air is blown into the tubular parison to make the parison blow up and form a product.

[0039] The present application Figure 8 The waterwheel type oxygenator float is a boat-shaped structure with a closed upper plate. The upper plate 32 of the boat-shaped float needs to be connected with the installation hole 36 of the main engine. The position of the installation hole corresponds to the deck 34 of the boat body. The deck 34 needs to be more firm than the boat body. For example, the thickness of the commonly used upper plate 32 of the float is about 4 mm, and the thickness of the vertical plate 33 and the bottom plate is 3 mm. The deck needs to be 5 mm or more. During the blow molding process, the intersection of the upper plate, the vertical plate and the deck will produce a local lack of material defect, which affects the service life of the float. The recess 35 is arranged on the upper plane of the connection between the upper plate 32 of the float and the vertical plate 33, so that the intersection of the upper plate 32 of the float and the vertical plate 33 will not produce a lack of material, and the service life of the boat-shaped float can be improved.

[0040] The blow molding method of the boat-shaped float of the waterwheel type oxygenator comprises a mold structure and a blow molding machine. The mold comprises an upper mold 37 and a lower mold 38. The upper mold 37 is provided with a convex mold for forming the recess 35 in the cavity. The lower mold 38 is provided with the shape of the deck 34 below. The upper mold 37 is provided with the shape of the deck 34 above. The upper mold 37 is sleeved outside the lower mold 38. During work, the upper mold and the lower mold are closed to cut off the excess material around the parison, and then continue to close the mold to extrude and form the deck and blow in compressed air to make the boat body blow up and form. It should be noted that the upper mold 37 and the lower mold 38 mentioned in the present application do not represent the meaning of limiting the orientation. The double-station blow molding machine can improve the production efficiency.

[0041] The above embodiments are only preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A double-station blow molding machine, comprising: Extrusion mechanism, mold clamping mechanism, hydraulic system, control system, shifting mechanism, bracket, base, die, its characteristics include, the mold clamping mechanism mainly includes a fixed wall panel, two movable wall panels, a pull rod and a mold shifting mechanism to form a double-station mold clamping mechanism, a roller or a slider is provided under the wall panel, and a track is provided under the roller or the slider, and the shifting mechanism drives the double-station mold clamping mechanism to move back and forth on the track, so that the two mold clamping mechanisms enter the working area in turn; the fixed wall panel is shared by the two mold clamping mechanisms, the movable wall panel, the fixed wall panel and the fixed plate of the mold shifting mechanism are connected together by a pull rod, and the movable wall panel moves on the pull rod; or the fixed wall panel and the mold shifting mechanism The fixed plates of the structure are connected together by pull rods, and the dynamic wall plates only move on the track; the double-station blow molding machine shares a set of synchronous mold clamping mechanism, including two racks and a gear, the gear is set in the gear seat and is positioned and rotated by the shaft, one end of the two racks is respectively fixed on a dynamic wall plate, and the other end of the rack enters the gear seat; the shifting mechanism includes an oil cylinder, the oil cylinder is connected to the base, the piston rod of the oil cylinder is connected to the gear seat of the mold clamping mechanism, and the oil cylinder is extended and retracted to make the two sets of molds enter the mouth mold in turn to work; or the shifting mechanism is connected to the base and the gear seat with a screw and a nut respectively, and the screw and the nut replace the oil cylinder as the shifting mechanism.

2. The double-station blow molding machine according to claim 1, characterized in that: The extrusion mechanism is arranged on the platform, and the mouth die discharges the material downward. The fixed molds of the two sets of molds are respectively installed on both sides of the fixed wall plate, and the movable molds are respectively installed on the movable wall plate. When one set of molds is in blow molding operation, the other set of molds is cooling and taking out the products. The double-station clamping mechanism and the extrusion mechanism share a set of hydraulic system and control system; when the mold is in blow molding operation, a synchronous clamping mechanism of the fixed mold and the movable mold relative to the mouth die is set. The double-station blow molding machine shares a set of synchronous clamping mechanism, including two racks and a gear. The gear is arranged in the gear seat and is positioned and rotated by the shaft. One end of the two racks is respectively fixed on a movable wall plate, and the other end of the rack enters the gear seat. Under the action of the gear and rack, the mold entering the working area for blow molding is synchronously closed.

3. The double-station blow molding machine according to claim 1, characterized in that: The pull rod is a cylindrical shaft, and a common fixed wall panel is fixed in the middle section of the shaft. There is a movable wall panel on each side of the fixed wall panel. There are mold installation positions on both sides of the fixed wall panel. The two movable wall panels are provided with mold installation positions on the surfaces relative to the common fixed wall panel. When working, the movable wall panels close or open the mold under the action of the oil cylinder.

4. A double-station blow molding machine according to claim 1, characterized in that: The pull rod is a cylindrical shaft, which is divided into two sections. One end of one section of the shaft is provided with an external thread, which passes through the pull rod hole of the common fixed wall plate, and one end of the other section of the shaft is provided with an internal thread, which is connected to the external thread to fix the pull rod and the common fixed wall plate. The other ends of the two sections of the shaft are respectively connected to the fixed plates on both sides of the double-station clamping mechanism, and the two movable wall plates move back and forth when working on the two sections of the shaft. The entire double-station clamping mechanism is supported by at least two rollers or sliders under the movable wall plates and moves on the track.

5. A double-station blow molding machine according to claim 1, characterized in that: The pull rod is a cylindrical shaft, which is divided into a main shaft and a secondary shaft. The main shaft is stepped, and the small end of the step passes through the fixed wall plate. The secondary shaft is a hollow shaft, which is sleeved on the outside of the small end of the main shaft. One end of the hollow shaft is in contact with the fixed wall plate, and the other end is in contact with the fixed plate and fastened with a nut; or the large end and small end of the main shaft are combined; or the pull rod is an optical shaft with threads at both ends, which passes through the fixed wall plate, and a hollow tube is arranged outside the optical shaft on both sides of the fixed wall plate. One end of the hollow tube is in contact with the fixed wall plate, and the other end is in contact with the fixed plate, and the two ends of the optical shaft are fastened with nuts.

6. A double-station blow molding machine according to claim 1, characterized in that: Each mold has at least one set of synchronous centering mechanism with the mouth mold. The centering mechanism includes two racks and a gear. The gear is set in the gear seat and is positioned and rotated by the shaft. One end of the two racks is respectively fixed on a movable wall plate, and the other end of the rack enters the gear seat. Under the action of the gear and rack, the mold entering the working area for blow molding is closed synchronously.

7. A double-station blow molding machine according to claim 1, characterized in that: The extrusion mechanism is basically vertically arranged to the top projection of the track. The extrusion mechanism includes a head and a die. The extrusion mechanism has the function of moving back and forth. The extrusion mechanism of the large blow molding machine is also provided with a storage mechanism. The storage mechanism is a screw drive mechanism that drives the screw to extrude the hot plastic into the storage mechanism. After reaching the set amount, the hot plastic is squeezed out to form a tubular blank. The blank enters the mold installed between the fixed wall panel and the movable wall panel. After the mold is closed synchronously, compressed air is blown into the blank to inflate and fill the mold into a product.

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