A blow mold auxiliary clamping device

Abstract

The present invention discloses a blow mold auxiliary clamping device, comprising a piston cylinder mechanism, a gasket and a fixed ring, the piston cylinder mechanism comprising a cylinder body, a piston and a piston rod, the piston is located in the middle of the piston rod and is placed in the piston cavity in the middle of the cylinder body, the piston divides the piston cavity into a front cavity and a rear cavity, the front and rear parts of the cylinder body are provided with a first oil inlet and a second oil inlet, the movable end of the piston rod is placed in the cavity inside the fixed ring and is coaxially arranged with the fixed ring, the movable end of the piston rod is connected and fixed with the gasket, a groove hole close to the gasket is provided in the fixed ring, the top end of the fixed ring is connected to one of the mold back plates of the blow mold, and the tail end of the cylinder body is connected to the other mold back plate. The blow mold auxiliary clamping device effectively realizes the locking and fixing of the back plate, avoids the influence of the auxiliary mold blowing and cooling on the product molding, improves the molding quality of the product, and has high practicality.

Description

Technical Field

[0001] The invention relates to a blow mould auxiliary clamping device and relates to the technical field of blow moulding machinery. Background Art

[0002] Blow molding is also called hollow blow molding, a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the parison to inflate the plastic parison and cling to the inner wall of the mold. After cooling and demolding, various hollow products are obtained. The blow molding mold is a mold used for product molding and is one of the important components in the blow molding machine. Since the blow molding mold is generally a main mold plus a sub-mold, the main mold is molded, and the sub-mold is blown and cooled to remove waste. Since the main mold and the sub-mold are a whole plate, the back plate is longer, and when the sub-mold is cooled and molded, the blowing pressure will open the sub-mold. When the back plate is stressed, the cantilever is longer, which will affect the molding and blowing at the main mold, resulting in unsatisfactory product molding, thus affecting product quality. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a blow mould sub-clamping device which has a simple structure and can effectively improve the product molding quality.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] A sub-clamping device for a blow molding mold comprises a piston-cylinder mechanism, a gasket and a fixing ring. The piston-cylinder mechanism comprises a cylinder body, a piston and a piston rod. The piston is located in the middle of the piston rod and is placed in a piston cavity in the middle of the cylinder body. The piston divides the piston cavity into a front cavity and a rear cavity. The front and rear parts of the cylinder body are provided with a first oil inlet and a second oil inlet respectively connected to the front cavity and the rear cavity. The fixing ring is cylindrical with closed front and rear ends. The movable end of the piston rod is placed in a cavity inside the fixing ring and is coaxially arranged with the fixing ring. The movable end of the piston rod is connected and fixed to the gasket. A groove hole close to the gasket is provided in the fixing ring. When the piston is extended and retracted, the gasket and the groove hole are respectively in a separated and combined state. The top end of the fixing ring is connected to one of the mold back plates of the blow molding mold, and the tail end of the cylinder body is connected to the other mold back plate.

[0006] Preferably, the gasket is a gear-shaped structure, the groove hole is a gear-shaped opening that cooperates with the gasket, and an end cover on one closed end of the gasket is provided with a piston rod opening for the movable end of the piston rod to pass through and to freely extend and retract, and the groove holes are distributed on the periphery of the piston rod opening and are arranged concentrically therewith.

[0007] Preferably, a plunger is provided on the outer wall of the cylinder body of the front cavity, and a slide groove cooperating with the plunger is provided on the outer wall of the rod body of the piston rod in the front cavity. The slide groove is a curved slide groove. The plunger is placed in the slide groove and can slide back and forth in the slide groove. When the piston rod telescopes back and forth, the plunger slides in the slide groove. The plunger slides a stroke in the slide groove, and the rotation angle of the piston rod is 40-70 degrees.

[0008] Preferably, the plunger slides a stroke in the slide groove, and the piston rod rotates at an angle of 60 degrees.

[0009] Preferably, the slide groove has two straight grooves and a curved groove, the straight grooves are located at both ends of the curved groove, the straight grooves are arranged along the axial direction of the piston rod, and the two straight grooves are not on the same straight line. After the plunger completes sliding in the rear straight groove, the washer and the groove hole complete the separation process. After the plunger slides in the curved groove, the washer rotates and its gear is misaligned with the gear hole in the groove hole. When the plunger slides in the front straight groove, the washer continues to move away from the groove hole and moves in a straight line.

[0010] Preferably, the washer is fixedly connected to the top of the movable end of the piston rod by means of screws.

[0011] Preferably, a spring washer is provided between the washer and the screw head.

[0012] Preferably, the cylinder body comprises a cylinder head and a cylinder barrel, the cylinder barrel and the cylinder head are detachably connected, the movable end of the piston rod passes through the end wall of the rear of the cylinder barrel and can move freely, and the other end of the piston rod passes through the cylinder head and can move freely.

[0013] Compared with the prior art, the advantages of the present invention are: the auxiliary clamping device of the blow mold has a simple structure and is easy to install and manufacture. By setting up an auxiliary clamping structure connecting the two mold back plates, the back plates are effectively locked and fixed, avoiding the influence of the auxiliary mold blowing and cooling on the product molding, improving the molding quality of the product, and having high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 is a side sectional view of the present invention;

[0016] Figure 2 is a side view of the piston and piston rod of the present invention;

[0017] Figure 3is a top view of the gasket of the present invention;

[0018] Figure 4 is a top view of the bottom groove hole of the fixing ring of the present invention;

[0019] Figure 5 It is a side schematic diagram of the present invention when installed. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention:

[0021] like Figure 1 The blow mold auxiliary clamping device shown is mainly used for locking and fixing two back plates of the blow mold, which includes a piston cylinder mechanism, a gasket 1 and a fixing ring 2. The piston cylinder mechanism includes a cylinder body 3, a piston 4 and a piston rod 5. The piston 4 is located in the middle of the piston rod 5 and is placed in the piston 4 cavity in the middle of the cylinder body 3. The piston 4 divides the piston cavity into a front cavity 6 and a rear cavity 7. The front and rear parts of the cylinder body 3 are provided with a first oil inlet 8 and a second oil inlet 9 respectively connected to the front cavity 6 and the rear cavity 7. Hydraulic oil enters and exits through the first oil inlet 8 and the second oil inlet 9, thereby controlling the piston 4 moves back and forth in the cylinder body 3, and realizes the locking and unlocking process of the position of the piston 4. The fixing ring 2 is cylindrical, and the front and rear ends are closed. The movable end of the piston rod 5 is placed in the cavity inside the fixing ring 2 and is coaxially arranged with the fixing ring 2. The movable end of the piston rod 5 is connected and fixed with the gasket 1. The fixing ring 2 is provided with a groove hole 10 close to the gasket 1. When the piston 4 is extended and retracted, the gasket 1 and the groove hole 10 are respectively in a separated and combined state. The top end of the fixing ring 2 is connected to one of the mold back plates of the blow mold, and the tail end of the cylinder body 3 is connected to the other mold back plate. In this embodiment, as shown in FIG. Figure 3 , Figure 4 As shown, in order to facilitate the fixing and locking of the gasket 1 and the inner cylinder of the fixing ring 2, the gasket 1 has a gear-shaped appearance structure, and the groove hole 10 is a gear-shaped opening that cooperates with the gasket 1. The end cover of the closed end on one side of the gasket 1 is provided with a piston rod 5 opening for the movable end of the piston rod 5 to pass through and to be freely retracted. The groove holes 10 are distributed on the outer periphery of the piston rod 5 opening and are concentrically arranged therewith. Therefore, when the piston rod 5 drives the gasket 1 to move linearly and drives it into the groove hole 10, the gasket 1 is completely matched with the groove hole 10, and then the piston rod 5 cannot rotate, thereby realizing the radial locking process of the two.

[0022] In this embodiment, in order to facilitate installation, disassembly and subsequent maintenance, the cylinder body 3 includes a cylinder head 301 and a cylinder barrel 302, and the cylinder barrel 302 is detachably connected to the cylinder head 301. The movable end of the piston rod 5 passes through the end wall of the rear part of the cylinder barrel and can move freely, and the other end of the piston rod 5 passes through the cylinder head 301 and can move freely, thereby facilitating installation and effectively improving the stability of the movement of the piston rod 5.

[0023] In this embodiment, if Figure 2 As shown, a plunger 11 is provided on the inner wall of the cylinder body 3 of the front cavity 6, and a slide groove cooperating with the plunger 11 is provided on the outer wall of the rod body of the piston rod 5 in the front cavity 6. The slide groove is a curved slide groove. The plunger 11 is placed in the slide groove and can slide back and forth in the slide groove. When the piston rod 5 moves back and forth, the plunger 11 slides in the slide groove. The plunger 11 slides a stroke in the slide groove, and the piston rod 5 rotates at an angle of 40-70 degrees. As a preferred embodiment, the plunger 11 slides a stroke in the slide groove, and the piston rod 5 rotates at an angle of 60 degrees. Therefore, when the piston rod 5 is linearly displaced, its body can also be rotated. Further, the slide groove has two linear grooves 12 and a curved groove 13. The linear groove 12 is located at At both ends of the curved groove 13, the linear grooves 12 are arranged along the axial direction of the piston rod 5, and the two linear grooves 12 are not on the same straight line. After the plunger 11 completes sliding in the rear linear groove 12, the washer 1 and the groove hole 10 complete the separation process. After the plunger 11 slides in the curved groove 13, the washer 1 rotates and its gear is misaligned with the gear hole in the groove hole 10. When the plunger 11 slides in the front linear groove 12, the washer 1 continues to move away from the groove hole 10 and moves linearly. Therefore, in actual application, when the piston rod 5 is displaced linearly forward and backward under the drive of the piston 4, the plunger 11 slides in the slide groove, and then the telescopic rod body rotates at a preset angle, thereby completing the separation and locking process of the washer 1 and the groove hole 10.

[0024] Furthermore, to facilitate installation and improve the stability of the washer 1 when it is fixed, the washer 1 is fixedly connected to the top of the movable end of the piston rod 5 by a screw 14, and a spring washer 15 is provided between the washer 1 and the head of the screw 14.

[0025] In practical application, the head of the fixing ring 2 is first connected and fixed to the lower side of one of the back plates 16 of the blow mold, and then the tail of the cylinder body 3 is connected and fixed to the upper side of the other back plate. The auxiliary clamping device is located between the two back plates. Figure 5As shown, the auxiliary clamping devices are provided with two and are arranged opposite to each other. When the two back plates need to be locked, the first oil inlet 8 is used for oil intake and the second oil inlet 9 is used for oil return. Then the piston 4 is controlled to drive the piston rod 5 to move away from the fixed ring 2. At this time, the plunger 11 slides in the rear straight groove 12 of the slide groove, and the piston rod 5 makes a straight motion. The piston rod 5 continues to move straightly, and the plunger 11 slides into the curved groove 13. At this time, the piston rod 5 not only moves straightly, but also rotates until the plunger 11 slides out of the curved groove 13. During the rotation of the piston rod 5, the gasket 1 is driven to rotate by 60 degrees, thereby making it outer The peripheral gear angle is aligned with the groove hole 10 in the fixing ring 2, and then the piston rod 5 continues to move linearly. At this time, the plunger 11 slides in the linear groove 12 in the front, so that the piston rod 5 will no longer rotate, and the gasket 1 will be driven by the piston rod 5 to match and combine with the groove hole 10 as a whole and fix, and then the locking action of the piston rod 5 is realized by controlling the hydraulic lock of the first oil inlet 8, thereby realizing the locking process of the entire device; and when the two back plates need to be unlocked, it is only necessary to operate according to the above-mentioned reverse process, and the separation of the gasket 1 from the groove hole 10 can realize the unlocking process of the entire device.

[0026] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A blow mold auxiliary clamping device, characterized in that: The invention comprises a piston-cylinder mechanism, a gasket and a fixing ring, wherein the piston-cylinder mechanism comprises a cylinder body, a piston and a piston rod, wherein the piston is located in the middle of the piston rod and is placed in a piston cavity in the middle of the cylinder body, the piston divides the piston cavity into a front cavity and a rear cavity, the front and rear parts of the cylinder body are provided with a first oil inlet and a second oil inlet which are connected to the front cavity and the rear cavity respectively, the fixing ring is cylindrical, and the front and rear ends are closed, the movable end of the piston rod is placed in a cavity inside the fixing ring and is coaxially arranged with the fixing ring, the movable end of the piston rod is connected and fixed with the gasket, a groove hole close to the gasket is provided in the fixing ring, and when the piston is extended and retracted, the gasket and the groove hole are respectively in a state of separation and combination state, the top end of the fixing ring is connected to one of the mold back plates of the blow molding mold, and the tail end of the cylinder body is connected to the other mold back plate, the gasket is a gear-shaped appearance structure, the groove hole is a gear-shaped opening matched with the gasket, and an end cover at one closed end of the gasket is provided with a piston rod opening for the movable end of the piston rod to pass through and to freely retract, the groove holes are distributed on the outer periphery of the piston rod opening and are concentrically arranged therewith, the cylinder body includes a cylinder head and a cylinder barrel, the cylinder barrel and the cylinder head are detachably connected, the movable end of the piston rod passes through the end barrel wall at the rear of the cylinder barrel and moves freely and retractably, and the other end of the piston rod passes through the cylinder head and moves freely and retractably.

2. A blow mold auxiliary clamping device according to claim 1, characterized in that: A plunger is provided on the inner wall of the cylinder body of the front cavity, and a slide groove cooperating with the plunger is provided on the outer wall of the rod body of the piston rod in the front cavity. The slide groove is a curved slide groove. The plunger is placed in the slide groove and can slide back and forth in the slide groove. When the piston rod telescopes back and forth, the plunger slides in the slide groove. The plunger slides a stroke in the slide groove, and the rotation angle of the piston rod is 40-70 degrees.

3. A blow mold auxiliary clamping device according to claim 2, characterized in that: The plunger slides in the slide groove for a stroke, and the piston rod rotates at an angle of 60 degrees.

4. A blow mold auxiliary clamping device according to claim 2, characterized in that: The slide groove has two straight grooves and a curved groove. The straight grooves are located at both ends of the curved groove. The straight grooves are set along the axial direction of the piston rod. The two straight grooves are not on the same straight line. After the plunger completes sliding in the rear straight groove, the washer and the groove hole complete the separation process. After the plunger slides in the curved groove, the washer rotates and its gear is misaligned with the gear hole in the groove hole. When the plunger slides in the front straight groove, the washer continues to move away from the groove hole and moves in a straight line.

5. The auxiliary clamping device for a blow mold according to claim 2, characterized in that: The washer is fixedly connected to the top of the movable end of the piston rod by means of screws.

6. A blow mold auxiliary clamping device according to claim 5, characterized in that: A spring washer is arranged between the washer and the screw head.

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