Double-station blow molding machine

Abstract

The invention relates to a double-station blow molding machine, which mainly comprises an extrusion mechanism, a mold closing mechanism, a hydraulic system, a control system, a displacement mechanism, a bracket, a base, a mouth mold and the like, 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 moving mechanism to form a double-station mold closing mechanism; a roller or a sliding block is arranged below the wall plate, a track is arranged below the roller or the sliding block, and the shifting mechanism drives the double-station mold closing mechanism to reciprocate on the track, so that the two mold closing mechanisms enter a working area in turn; the fixed wall plate is shared by the two mold closing mechanisms, the movable wall plate, the fixed wall plate and a fixed plate of the mold moving mechanism are connected together through a 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 moving mechanism are connected together through a pull rod, and the movable wall plate only moves on the track.

Description

Technical Field

[0001] The invention belongs to the plastic processing industry, and particularly relates to a double-station mold clamping mechanism and a double-station blow molding machine. Background Art

[0002] Usually, large-sized hollow blow molding machines have only one clamping mechanism. After blowing one product each time, you need to wait for the product to cool down, take out the workpiece, and then blow the second one, which is inefficient. In order to improve efficiency, someone invented a high-efficiency automatic hollow blow molding machine, patent number 201721020141.5, which is two clamping devices set on the same base to work back and forth. The two sets of clamping devices working in turn can indeed improve work efficiency, but each set of two clamping devices is set on the same base, the base is very long, the floor space is large, and the manufacturing cost is also high. Summary of the invention

[0003] The purpose of the present invention is to provide a double-station clamping mechanism and a blow molding machine with the double-station clamping mechanism, which can improve the working efficiency, reduce the cost and occupy less space.

[0004] The object of the present invention is achieved in that: A double-station blow molding machine mainly includes: an extrusion mechanism, a mold clamping mechanism, a hydraulic system, a control system, a shifting mechanism, a bracket, a base, a die, etc. 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. Rollers or sliders are arranged under the wall panels, and tracks are arranged under the rollers or sliders. 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 the pull rod, and the movable wall panel can move on the pull rod; or the fixed wall panel and the fixed plate of the mold shifting mechanism are connected together by the pull rod, and the movable wall panel only moves on the track.

[0005] The extrusion mechanism is arranged on the platform, and the mouth die discharges the material downwards. The fixed molds of the two sets of molds are respectively installed on both sides of the fixed wall board, and the movable molds are respectively installed on the movable wall board. 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 needs to be set. The double-station blow molding machine can share a set of synchronous clamping mechanism, including two racks and a gear. The gear is arranged in the gear seat and is rotatable by the shaft positioning. One end of the two racks is respectively fixed on a movable wall board, and the other end of the rack enters the gear seat. Under the action of the gear and the rack, the mold entering the working area for blow molding is closed synchronously.

[0006] The shifting mechanism includes an oil cylinder, which is connected to the base. The piston rod of the oil cylinder is connected to the gear seat of the mold clamping mechanism. The oil cylinder is retracted to allow the two sets of molds to enter the mouth mold in turn to work; or the shifting mechanism can be connected to the base and the gear seat respectively with a screw and a nut, and the screw and the nut can replace the oil cylinder as the shifting mechanism.

[0007] The pull rod is a cylindrical shaft, a common fixed wall panel is fixed in the middle section of the shaft, a movable wall panel is provided on each side of the fixed wall panel, mold mounting positions are provided on both sides of the fixed wall panel, and mold mounting positions are provided on the surfaces of the two movable wall panels 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.

[0008] 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 in connection; 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 moving wall plates move back and forth when working on the two sections of the shaft, and the entire double-station clamping mechanism is supported by at least two rollers or sliders under the two moving wall plates and moves on the track.

[0009] 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 the 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.

[0010] In the described double-station blow molding machine, each mold has at least one set of synchronous centering mechanism with the mouth mold, and the centering mechanism includes two racks and a gear. The gear is arranged in the gear seat and is rotatable by the shaft. One end of the two racks is respectively fixed on a moving 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.

[0011] The extrusion mechanism is basically vertically arranged with respect to the top projection of the track. The extrusion mechanism includes a machine head and a die. The extrusion mechanism has the function of moving forward and backward. The extrusion mechanism of the large blow molding machine is also provided with a storage mechanism. The storage mechanism is a screw driving mechanism driving the screw to extrude the hot plastic into the storage mechanism. After reaching the set amount, the hot plastic is pressed out to become a tubular blank. The blank enters between the mold installed on the fixed wall panel and the moving wall panel. After the mold is synchronously closed, compressed air is blown into the blank to inflate and fill the mold into a product.

[0012] The outstanding advantages of the present invention compared with the prior art are: The double-station mold clamping mechanism and the blow molding machine with the double-station mold clamping mechanism of the present invention improve the working efficiency, and the present invention has a simple structure, is convenient to use and occupies little space. The two sets of mold clamping mechanisms of the present invention share a synchronization mechanism and use the same guide rail to complete the mold clamping and mold moving actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is one of the schematic diagrams of the double-station clamping mechanism of the present invention; Figure 2 This is one of the schematic diagrams of the double-station clamping mechanism of the present invention; Figure 3 This is a three-dimensional schematic diagram of the double-station clamping mechanism of the present invention; (the moving wall plate and the pull rod are not in contact) Figure 4 This is one of the three-dimensional schematic diagrams of the double-station clamping mechanism of the present invention; (a mold with a waterwheel-type aerator boat-shaped floating body) Figure 5 It is a three-dimensional schematic diagram of a blow molding machine of the double-station clamping mechanism of the present invention; Figure 6 It is a schematic diagram of the synchronization structure of the present invention; Figure 7 It is a schematic diagram of the connection structure between the tie rod and the fixed wall plate of the present invention; Figure 8 It is a three-dimensional schematic diagram of a boat-shaped floating body of the present invention; Fig. 9 is a schematic cross-sectional view of a ship-shaped floating body of the present invention; Fig.10 It is a three-dimensional schematic diagram of the upper mold of the mold of the present invention; Fig.11 It is a three-dimensional schematic diagram of the lower mold of the mold of the present invention; Fig.12 It is a schematic cross-sectional view of the mold and the boat-shaped floating body of the present invention.

[0014] In the figure: 1-fixed wall panel; 2-movable wall panel; 3-fixed plate; 4-pull rod; 5-base; 6-hydraulic cylinder; 7-linear rail; 8-slider; 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-bracket; 20-platform; 21-lifting mechanism; 22-screw drive mechanism; 23-barrel; 24-storage cylinder; 25-pressing cylinder; 26-mouth mold; 27-internal thread; 28-external thread; 29-hollow tube; 30-optical axis; 31-boat-shaped floating body; 32-upper panel; 33-vertical plate; 34-deck; 35-groove; 36-mounting hole; 37-upper mold; 38-lower mold. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to specific embodiments of the present invention. Figure 1-12 : It should be noted that the features of the embodiments of the present application can be combined with each other without conflict. Unless otherwise clearly specified and limited in the description of the present invention, the terms "installation", "connection" and "fixed connection" should be understood in a broad sense, which can be a fixed connection or a detachable connection, and can be a direct connection or an indirect connection.

[0016] A double-station clamping mechanism mainly includes: a wall panel, a pull rod 4, a mold shifting mechanism, and a displacement mechanism. The wall panel is divided into a movable wall panel 2 and a fixed wall panel 1. A common fixed wall panel 1, a movable wall panel 2, a mold shifting mechanism, etc. constitute a clamping mechanism and can also be called a work station. The mold shifting mechanism includes a hydraulic mechanism and a fixed plate 3, and two clamping mechanisms are combined into a double-station clamping mechanism. A roller 10 or a slider 8 is arranged under the movable wall panel 2, and a track is arranged under the roller 10 or the slider 8. The displacement mechanism drives the double-station clamping mechanism to move back and forth on the track, so that the two clamping mechanism units enter the working area in turn. The double-station clamping mechanism includes two movable wall panels 2, a fixed wall panel 1 and two mold shifting mechanisms. The fixed wall panel 1 can be shared by two clamping mechanisms, and the movable wall panel 2 and the fixed wall panel 1 can be connected together by a pull rod 4. The shifting mechanism may be a cylinder 16, the cylinder 16 is connected to the base 5 via a cylinder seat 17, and the piston rod 15 of the cylinder 16 may be connected to the gear seat 13. The shifting mechanism drives the double-station clamping mechanism to move on the track.

[0017] The tie rod 4 is a cylindrical shaft, and a common fixed wall panel 1 is fixed to the middle section of the shaft, and a movable wall panel 2 is provided on each side of the fixed wall panel 1. The fixed plate 3 of the mold shifting mechanism can be placed obliquely on the tie rod 4; or the fixed plate 3 of the mold shifting mechanism extends downward and is supported by rollers 10 or sliders 8, and the movable wall panel 2 can be positioned by the sliders 8 without contacting the tie rod 4. There are mold 18 installation positions on both sides of the common fixed wall panel 1, and both movable wall panels 2 have mold 18 installation positions on the side opposite to the common fixed wall panel 1. When working, the movable wall panels 2 move back and forth under the action of the mold shifting mechanism.

[0018] A double-station clamping mechanism has pull rods 4 arranged at two diagonal corners of the wall panel, at least one roller 10 is arranged under each movable wall panel 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 linear track 7, and a slider 8 is arranged on the linear track 7. The connection between the wall panel and the slider 8 can further improve the accuracy of the clamping mechanism.

[0019] The pull rod 4 can be a cylindrical shaft, the middle section of the shaft is broken, one section of the shaft is formed with an external thread 28, the external thread 28 passes through the pull rod hole of the common fixed wall plate 1, and one end of the other section of the shaft is formed with an internal thread 27, the internal thread 27 is connected to the external thread to fix the pull rod and the common fixed wall plate 1; or the sections of the two sections of the shaft connected to the fixed wall plate are both provided with internal threads 27, and the threads are connected to the studs set in the fixed wall plate.

[0020] like Figure 3 In the double-station clamping mechanism shown, the movable wall panel does not contact the pull rod, and the pull rod can be arranged such that the pull rod is composed of an optical axis 30 with external threads at both ends, which passes through the fixed wall panel 1 and the fixed plate 3 of the mold shifting mechanism. A hollow tube 29 is sleeved on the outside of the optical axis in the gap between the fixed wall panel 1 and the fixed plate 3 of the mold shifting mechanism to axially position the fixed wall panel 1 and the fixed plate 3 of the mold shifting mechanism, and the two ends of the optical axis are fastened with nuts.

[0021] The common wall panel may be provided with staggered tie rod holes, that is, the tie rod holes of the common wall panel may be staggered up and down or left and right to respectively correspond to the left or right clamping mechanism. The roller 10 or slider 8 may be provided only under each movable wall panel 2, or under the common fixed wall panel 1. A large blow molding machine may also be provided with a roller or slider 8 under the diagonal arm.

[0022] A blow molding machine with a double-station clamping mechanism includes a bracket 19, a die 26, an extrusion mechanism, a hydraulic system, and a control system. A pair of molds 18 are installed in the installation position of the double-station clamping mechanism. When one mold 18 is in blow molding operation, the workpiece of the other mold 18 is cooled. The double-station clamping mechanism and the extrusion mechanism can share a set of control systems.

[0023] The double-station clamping mechanism can share a set of synchronous centering mechanisms with the mouth die 26. The centering mechanism includes two racks 11 and a gear 12. The gear 12 is arranged in a gear seat 13 and can rotate by an axis positioning gear. One end of the two racks 11 is respectively fixed on a moving wall panel 2, and the other end of the rack 11 enters the guide mechanism; the piston rod 15 of the shifting mechanism is connected to the gear seat 13 to drive the double-station clamping mechanism to reciprocate on the track so that the two molds enter the working position in turn.

[0024] The extrusion mechanism is basically vertically arranged with respect to the top projection of the track. The extrusion mechanism includes a machine head and a mouth die 26. The extrusion mechanism has the function of moving forward and backward. The extrusion mechanism of the large blow molding machine is also provided with a storage mechanism. The storage mechanism is a screw drive mechanism driving a screw to extrude hot plastic into the storage mechanism. After reaching a set amount, the hot plastic is pressed out by a hydraulic cylinder through a mouth mold to become a tubular blank. The tubular blank enters between the mold installed on the fixed wall panel and the movable wall panel. After the mold is synchronously closed, compressed air is blown into the tubular blank to make the blank expand and form into a product.

[0025] The present invention Figure 8 The float of the waterwheel-type aerator is a boat-shaped structure with an upper panel closed. The periphery of the upper panel 32 of the boat-shaped float needs to be connected to the mounting holes 36 of the main engine. The position of the mounting holes is equivalent to the deck 34 of the hull. The deck 34 needs to be stronger than the hull. For example, the thickness of the commonly used upper panel 32 of the float is about 4 mm, the thickness of the vertical plate 33 and the bottom plate can be 3 mm, and the deck needs to be 5 mm or more. During the blow molding process, the intersection of the upper panel, the vertical plate and the deck will produce local material shortage defects, which will affect the service life of the float. The present invention sets a groove 35 on the upper plane where the upper panel 32 of the float is connected to the vertical plate 33, so that the intersection of the upper panel 32 of the float and the vertical plate 33 will not produce material shortage, which can improve the service life of the boat-shaped float.

[0026] The blow molding method of the boat-shaped floating body of the waterwheel-type aerator includes a mold structure and a blow molding machine. The mold includes an upper mold 37 and a lower mold 38 to form a set of molds. The cavity of the upper mold 37 is formed with a convex mold to generate a groove 35. The lower mold 38 is set to form the shape below the deck 34. The upper mold 37 is formed with the shape above the deck 34. The upper mold 37 is sleeved outside the lower mold 38. When working, the upper mold and the lower mold are molded together to cut off the excess material around the parison and then continue to mold to extrude the deck and blow in compressed air to blow the hull into shape. It should be noted that the upper mold 37 and the lower mold 38 mentioned in this exchange do not mean to limit the direction. Using a double-station blow molding machine can improve production efficiency.

[0027] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-station blow molding machine, mainly comprising: The invention is composed of an extrusion mechanism, a clamping mechanism, a hydraulic system, a control system, a shifting mechanism, a bracket, a base, a die, etc., and its characteristics include that the clamping mechanism mainly comprises a fixed wall panel, two movable wall panels, a pull rod and a mold shifting mechanism to form a double-station clamping mechanism, a roller or a slider is arranged under the wall panel, and a track is arranged under the roller or the slider, and the shifting mechanism drives the double-station clamping mechanism to move back and forth on the track, so that the two clamping mechanisms enter the working area in turn; the fixed wall panel is shared by the two 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 can move on the pull rod; or 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 only moves on the track.

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 downwards. The fixed molds of the two sets of molds are respectively installed on both sides of the fixed wall board, and the movable molds are respectively installed on the movable wall board. 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 needs to be set. The double-station blow molding machine can share a set of synchronous clamping mechanism, including two racks and a gear. The gear is arranged in the gear seat and is rotatable by the shaft positioning. One end of the two racks is respectively fixed on a movable wall board, and the other end of the rack enters the gear seat. Under the action of the gear and the rack, the mold entering the working area for blow molding is closed synchronously.

3. The double-station blow molding machine according to claim 1, characterized in that: The shifting mechanism includes an oil cylinder, which is connected to the base. The piston rod of the oil cylinder is connected to the gear seat of the mold clamping mechanism. The oil cylinder is retracted to allow the two sets of molds to enter the mouth mold in turn to work; or the shifting mechanism can be connected to the base and the gear seat respectively with a screw and a nut, and the screw and the nut can replace the oil cylinder as the shifting mechanism.

4. The double-station blow molding machine according to claim 1, characterized in that: The pull rod is a cylindrical shaft, a common fixed wall panel is fixed in the middle section of the shaft, a movable wall panel is provided on each side of the fixed wall panel, mold mounting positions are provided on both sides of the fixed wall panel, and mold mounting positions are provided on the surfaces of the two movable wall panels 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.

5. A double-station blow molding machine as claimed in 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 in connection; 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 moving wall plates move back and forth when working on the two sections of the shaft, and the entire double-station clamping mechanism is supported by at least two rollers or sliders under the two moving wall plates and moves on the track.

6. A double-station blow molding machine as claimed in 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 the 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.

7. A double-station blow molding machine as claimed in 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 arranged in the gear seat and is rotatable by the shaft. One end of the two racks is respectively fixed on a moving 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.

8. A double-station blow molding machine as claimed in claim 1, characterized in that: The extrusion mechanism is basically vertically arranged with respect to the top projection of the track. The extrusion mechanism includes a machine head and a die. The extrusion mechanism has the function of moving forward and backward. The extrusion mechanism of the large blow molding machine is also provided with a storage mechanism. The storage mechanism is a screw drive mechanism driving a screw to extrude hot plastic into the storage mechanism. After reaching the set amount, the hot plastic is pressed out to become a tubular blank. The blank enters between the mold installed on the fixed wall panel and the moving wall panel. After the mold is synchronously closed, compressed air is blown into the blank to inflate and fill the mold into a product.

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