A mold opening and closing mechanism for a blow molding machine used to produce plastic kettles

Abstract

The present invention discloses a mold opening and closing mechanism for a blow molding machine used to produce plastic kettles, comprising a base plate, a first template, a second template, a first rack, a second rack, a first gear, a second gear, a torque limiter, a push-pull device, and a control device. The first template and the second template are both slidably connected to the base, the first template and the second template are arranged relative to each other, the first template is connected to a push-pull device, and the push-pull device is connected to a control device. A horizontally arranged first rack is fixed to the first template, with the toothed surface of the first rack facing upward, and a horizontally arranged second rack is fixed to the second template. The present invention matches the first rack, the second rack, the first gear, and the second gear so that the device can select the appropriate first rack, the second rack, the first gear, and the second gear as needed to achieve synchronous, non-uniform movement of the first template and the second template, thereby making the device highly adaptable.

Description

Technical field

[0001] The present invention relates to the technical field of plastic products, in particular to the technical field of mold opening and closing mechanisms. [Background Technology]

[0002] Blow molding, also known as hollow blow molding, is a rapidly developing plastics processing method. A tubular plastic parison, obtained by extrusion or injection molding of a thermoplastic resin, is placed while hot in a split mold. Immediately after the mold is closed, compressed air is introduced into the parison, inflating it until it adheres tightly to the mold's inner wall. After cooling, it is demolded to produce various hollow products. The manufacturing process for blown film is very similar in principle to blow molding for hollow products, but it does not use a mold. From the perspective of plastics processing technology classification, blown film forming is generally classified as extrusion. Blow molding began to be used to produce small bottles made of low-density polyethylene during World War II. With the advent of high-density polyethylene and the development of blow molding machines in the late 1950s, blow molding technology gained widespread application. Hollow containers can reach volumes of thousands of liters, and some production processes now utilize computer control. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, and polyester, and the resulting hollow containers are widely used as industrial packaging containers. During the production of plastic water bottles, molds of varying thicknesses are sometimes mounted on a template. This often requires the two templates to achieve synchronized movement despite unequal spacing between their centers. This spacing must also be adjustable to accommodate changes in mold thickness. Currently, the industry mostly uses mechanical limiters, which achieve this positioning by colliding one template with a mechanical backer. However, existing adjustment methods place significant pressure on the templates, fail to ensure synchronized movement, and can easily damage the molds during movement. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to propose a mold opening and closing mechanism for a blow molding machine for producing plastic kettles, which can enable the template to move synchronously and is not easily damaged in the event of a failure.

[0004] To achieve the above-mentioned objectives, the present invention proposes a mold opening and closing mechanism for a blow molding machine for producing plastic kettles, comprising a base plate, a first template, a second template, a first rack, a second rack, a first gear, a second gear, a torque limiter, a push-pull device, and a control device. The first template and the second template are both slidably connected to the base, the first template and the second template are arranged opposite to each other, the first template is connected to a push-pull device, and the push-pull device is connected to a control device. A horizontally arranged first rack is fixed on the first template, and the toothed surface of the first rack faces upward. A horizontally arranged second rack is fixed on the second template, and the toothed surface of the second rack faces downward. Two relatively arranged mounting seats are fixed on the base, and a rotatable rotating shaft is respectively installed on the two mounting seats. The two rotating shafts are located on the same axis, one of the rotating shafts is equipped with a first gear that matches the first rack, and the other rotating shaft is equipped with a second gear that matches the second rack. The two rotating shafts are connected by a torque limiter.

[0005] Preferably, the rotating shaft is mounted on the mounting seat via a bearing.

[0006] Preferably, a plurality of mutually parallel guide bars are fixed on the bottom plate, and the cross section of the guide bars is an inverted isosceles trapezoid. The first template and the second template are both provided with a plurality of guide grooves matching the guide bars.

[0007] Preferably, the first rack is detachably mounted near the vertical bisector of the first template, the second rack is detachably mounted near the vertical bisector of the second template, the first template is provided with a first opening window allowing the second rack to pass through, and the second template is provided with a second opening window allowing the first rack to pass through.

[0008] Preferably, a plurality of first guide rods are fixed on the first template, a plurality of second guide rods are fixed on the second template, a plurality of first guide holes matching with the first guide rods are provided on the first template, and a plurality of second guide holes matching with the first guide rods are provided on the second template.

[0009] Preferably, the first template and the second template are both connected to a spring, the end of the spring is connected to a tension sensor, the tension sensor is fixed on a fixed plate fixed to the bottom plate, and the tension sensor is connected to the control device.

[0010] Preferably, the first gear and the second gear may be the same gear or different gears.

[0011] Beneficial effects of the present invention: The present invention matches the first rack, the second rack, the first gear, and the second gear so that the device can select the appropriate first rack, the second rack, the first gear, and the second gear as needed to achieve synchronous non-uniform speed movement of the first template and the second template, so that the device has good adaptability; the setting of the torque limiter ensures that when the second rack and the second gear are accidentally stuck, it will not affect the matching between the first rack and the first gear, thereby ensuring the safety of the device; the setting of the tension sensor ensures that the device can be stopped in time by the control device when abnormal opening and closing occurs, thereby ensuring the safety of the equipment.

[0012] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings.

Brief Description of the Drawings

[0013] Figure 1 This is a front view of a mold opening and closing mechanism of a blow molding machine for producing plastic kettles according to the present invention;

[0014] Figure 2 The present invention is a partial schematic diagram of a mold opening and closing mechanism of a blow molding machine for producing plastic kettles.

[0015] In the figure: 1-first template, 2-second template, 3-base plate, 4-mounting seat, 5-control device, 10-push-pull device, 11-first rack, 12-first opening window, 13-first guide rod, 14-first guide hole, 20-guide groove, 21-second rack, 22-second opening window, 23-second guide rod, 24-second guide hole, 30-guide bar, 31-fixed plate, 32-tension sensor, 33-spring, 40-rotating shaft, 41-first gear, 42-second gear, 43-torque limiter, 45-bearing. [Specific implementation method]

[0016] See Figure 1 and Figure 2The present invention provides a mold opening and closing mechanism for a blow molding machine for producing plastic kettles, comprising a base plate 3, a first template 1, a second template 2, a first rack 11, a second rack 21, a first gear 41, a second gear 42, a torque limiter 43, a push-pull device 10, and a control device 5. The first template 1 and the second template 2 are both slidably connected to the base, the first template 1 and the second template 2 are arranged opposite to each other, the first template 1 is connected to a push-pull device 10, and the push-pull device 10 is connected to a control device 5. A horizontally arranged first rack 11 is fixed to the first template 1, and the toothed surface of the first rack 11 faces upward. A horizontally arranged second rack 21 is fixed on the second template 2, with the second rack 21 facing downward. Two relatively arranged mounting seats 4 are fixed on the bottom plate 3, and a rotatable shaft 40 is respectively installed on the two mounting seats 4. The two shafts 40 are located on the same axis, and a first gear 41 that matches the first rack 11 is installed on one of the shafts 40, and a second gear 42 that matches the second rack 21 is installed on the other shaft 40. The two shafts 40 are connected by a torque limiter 43, and the shaft 40 is installed on the mounting seat 4 through a bearing 45. A plurality of mutually parallel guide bars 30 are fixed on the bottom plate 3. The cross section of the guide bar 30 is an inverted isosceles trapezoid. The first template 1 and the second template 2 are both provided with a plurality of guide grooves 20 that cooperate with the guide bars 30. The first rack 11 is detachably mounted near the vertical bisector of the first template 1, and the second rack 21 is detachably mounted near the vertical bisector of the second template 2. The first template 1 is provided with a first opening window 12 that allows the second rack 21 to pass through, and the second template 2 is provided with a second opening window 22 that allows the first rack 11 to pass through. The first template 1 is fixed with a plurality of first guide rods 13 , a plurality of second guide rods 23 are fixed on the second template 2, a plurality of first guide holes 14 are provided on the first template 1 and cooperate with the first guide rods 13, and a plurality of second guide holes 24 are provided on the second template 2 and cooperate with the first guide rods 13, the first template 1 and the second template 2 are each connected to a spring 33, the end of the spring 33 is connected to a tension sensor 32, the tension sensor 32 is fixed on a fixed plate 31 fixed on the base plate 3, the tension sensor 32 is connected to the control device 5, the first gear 41 and the second gear 42 can be the same gear or different gears.

[0017] Working process of the present invention:

[0018] In the mold opening and closing mechanism of a blow molding machine for producing plastic kettles of the present invention, during operation, the first rack 11, the second rack 21, the first gear 41, and the second gear 42 cooperate with each other, so that the device can select the appropriate first rack 11, the second rack 21, the first gear 41, and the second gear 42 as needed to achieve synchronous non-uniform speed movement of the first template 1 and the second template 2, so that the device has good adaptability; the setting of the torque limiter 43 ensures that when the second rack 21 and the second gear 42 are accidentally stuck, it will not affect the cooperation between the first rack 11 and the first gear 41, thereby ensuring the safety of the device; the setting of the tension sensor 32 ensures that when the device opens and closes abnormally, it can be stopped in time by the control device 5, thereby ensuring the safety of the equipment.

[0019] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A mold opening and closing mechanism for a blow molding machine for producing plastic kettles, characterized by: The invention comprises a base plate (3), a first template (1), a second template (2), a first rack (11), a second rack (21), a first gear (41), a second gear (42), a torque limiter (43), a push-pull device (10), and a control device (5). The first template (1) and the second template (2) are both slidably connected to the base. The first template (1) and the second template (2) are arranged relative to each other. The first template (1) is connected to a push-pull device (10), and the push-pull device (10) is connected to a control device (5). A horizontally arranged first rack (11) is fixed on the first template (1), and the toothed surface of the first rack (11) faces upward. A horizontally arranged second rack (21) is fixed on the second template (2), and the toothed surface of the second rack (21) faces downward. Two relatively arranged mounting seats (4) are fixed on the base plate (3), and a rotatable shaft (40) is respectively installed on the two mounting seats (4). The two shafts (40) are located on the same axis, and one of the shafts (40) is located on the same axis. 0) is mounted with a first gear (41) matched with a first rack (11), and another rotating shaft (40) is mounted with a second gear (42) matched with a second rack (21), and the two rotating shafts (40) are connected via a torque limiter (43), and the rotating shaft (40) is mounted on the mounting seat (4) via a bearing (45), and a plurality of mutually parallel guide bars (30) are fixed on the bottom plate (3), and the cross section of the guide bar (30) is an inverted isosceles trapezoid. The first mold The plate (1) and the second template (2) are both provided with a plurality of guide grooves (20) that cooperate with the guide bars (30); the first rack (11) is detachably mounted near the vertical bisector of the first template (1); the second rack (21) is detachably mounted near the vertical bisector of the second template (2); the first template (1) is provided with a first opening window (12) that allows the second rack (21) to pass through; and the second template (2) is provided with a second opening window (22) that allows the first rack (11) to pass through.

2. A mold opening and closing mechanism for a blow molding machine for producing plastic kettles according to claim 1, characterized in that: A plurality of first guide rods (13) are fixed on the first template (1), a plurality of second guide rods (23) are fixed on the second template (2), a plurality of first guide holes (14) matching with the first guide rods (13) are provided on the first template (1), and a plurality of second guide holes (24) matching with the first guide rods (13) are provided on the second template (2).

3. The mold opening and closing mechanism of a blow molding machine for producing plastic kettles according to claim 1, characterized in that: A spring (33) is connected to each of the first template (1) and the second template (2). The end of the spring (33) is connected to a tension sensor (32). The tension sensor (32) is fixed on a fixed plate (31) fixed on the bottom plate (3). The tension sensor (32) is connected to the control device (5).

4. The mold opening and closing mechanism of a blow molding machine for producing a plastic kettle according to claim 1, characterized in that: The first gear (41) and the second gear (42) are the same gear or different gears.

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