阅读说明：本技术 一种注塑机及其工作方法 (Injection molding machine and working method thereof ) 是由 洪建军 施燕龙 徐永桁 于 2020-12-11 设计创作，主要内容包括：一种注塑机及其工作方法,包括固定模板、设在固定模板上的螺杆注塑装置、设在固定模板下方的活动模板、用于驱动活动模板的第一驱动机构、设在活动模板上的模具、安装在活动模板上的移模装置和设在活动模板下方的抱桩装置；抱桩装置包括与活动模板连接的中心轴、用于抱紧中心轴的抱紧机构和用于支撑抱紧机构的支撑机构；所述抱紧机构包括第一抱紧块、与第一抱紧块相对设置的第二抱紧块和与第一抱紧块连接的抱紧油缸；所述支撑机构包括环形液压缸,所述环形液压缸包括带有环形活塞腔的缸体、与缸体配合的缸盖和设在环形活塞腔内的环形活塞。由于抱紧机构的第一抱紧块与第二抱紧块本身套在中心轴上,启动后能快速抱紧中心轴,进而起到快速锁模的动作。(An injection molding machine and a working method thereof comprise a fixed template, a screw injection molding device arranged on the fixed template, a movable template arranged below the fixed template, a first driving mechanism for driving the movable template, a mold arranged on the movable template, a mold moving device arranged on the movable template and a pile holding device arranged below the movable template; the pile embracing device comprises a central shaft connected with the movable template, a embracing mechanism used for embracing the central shaft and a supporting mechanism used for supporting the embracing mechanism; the clasping mechanism comprises a first clasping block, a second clasping block arranged opposite to the first clasping block and a clasping oil cylinder connected with the first clasping block; the supporting mechanism comprises an annular hydraulic cylinder, and the annular hydraulic cylinder comprises a cylinder body with an annular piston cavity, a cylinder cover matched with the cylinder body and an annular piston arranged in the annular piston cavity. Because the first holding block and the second holding block of the holding mechanism are sleeved on the central shaft, the central shaft can be held fast after starting, and then the action of fast locking the mold is realized.)

1. An injection molding machine comprises a fixed template, a screw injection molding device arranged on the fixed template, a movable template arranged below the fixed template, a first driving mechanism used for driving the movable template and a mold arranged on the movable template; the method is characterized in that: the pile-embracing device is arranged below the movable template;

the clasping mechanism comprises a first clasping block, a second clasping block arranged opposite to the first clasping block and a clasping oil cylinder connected with the first clasping block; a first arc-shaped surface is arranged in the middle of one surface of the first enclasping block, which is opposite to the second enclasping block, first guide grooves are arranged on two sides of the first arc-shaped surface, the outer sides of the first guide grooves extend forwards to form a first rack, and the first enclasping oil cylinder acts on one surface of the first enclasping block, which is far away from the second enclasping block; a second arc-shaped surface is arranged in the middle of one surface, opposite to the first clamping block, of the second clamping block, two sides of the second arc-shaped surface extend forwards to form a first guide block matched with the first guide groove, a plurality of teeth are arranged on two sides of the second clamping block to form a second rack, a gear is arranged between the first rack and the second rack, and the gear is meshed with the first rack and the second rack respectively; the first arc-shaped surface and/or the second arc-shaped surface are/is provided with inner anti-skid stripes, and the outer surface of the central shaft is provided with outer anti-skid stripes; the first enclasping block and the second enclasping block are arranged in a guide channel, the guide channel comprises a bottom plate, a top plate and side plates arranged on two sides, and openings for the first enclasping block and the second enclasping block to extend out are formed in two ends of the guide channel; the supporting mechanism comprises an annular hydraulic cylinder, and the annular hydraulic cylinder comprises a cylinder body with an annular piston cavity, a cylinder cover matched with the cylinder body and an annular piston arranged in the annular piston cavity; the center of the cylinder body is provided with a first guide hole for the central shaft to pass through; the part of the annular piston extending out of the cylinder body forms a supporting part and can support the bottom of the bottom plate;

the die moving device comprises a movable die plate, spring seats arranged on two sides of the movable die plate, sliding rails arranged at the bottoms of the spring seats, sliding blocks arranged on the movable die plate and matched with the sliding rails, supporting seats arranged at the bottom of the movable die plate, a second driving mechanism used for driving the movable die plate to translate and an ejector rod mechanism arranged on the movable die plate; the die is arranged on the movable die plate, guide grooves are formed in two sides of the movable die plate, the upper portion of the spring seat extends into the guide grooves, a spring is arranged between the top of the spring seat and the movable die plate, a positioning pin is arranged on the spring seat, a positioning hole is formed in the movable die plate corresponding to the positioning pin, and the positioning pin extends into the positioning hole; a first gap is arranged between the top surface of the spring seat and the movable template, a second gap is arranged between the bottom surface of the supporting seat and the movable template, and the width of the first gap is larger than that of the second gap.

2. An injection molding machine according to claim 1, wherein: the output shaft of the holding oil cylinder is connected with the first holding block through a connecting plate; the top plate is provided with a first through hole for the central shaft to pass through, the top plate consists of two symmetrical top plate units, and two sides of each top plate unit are locked on the tops of the side plates through bolts; the bottom plate is provided with a second through hole for the central shaft to pass through, the bottom plate is provided with connecting lugs extending towards two opposite directions, and the end parts of the connecting lugs are sleeved on the guide posts.

3. An injection molding machine according to claim 1, wherein: the cylinder body is square, a plurality of fixing holes are formed in the cylinder body, and the first driving mechanism and the guide pillar are fixed on the cylinder body.

4. An injection molding machine according to claim 1, wherein: the cylinder cover comprises a connecting part and a plugging part, the connecting part is fixed at the top of the second supporting part through a bolt, and oil seals are arranged between the inner side of the plugging part and the outer side of the supporting part and between the outer side of the plugging part and the outer wall of the annular piston cavity.

5. An injection molding machine according to claim 1, wherein: the top of the first anti-skid stripe is a plane, and the bottom of the first anti-skid stripe is an inclined plane; the bottom of the second anti-skid stripe is a plane, and the top of the second anti-skid stripe is an inclined plane.

6. An injection molding machine according to claim 1, wherein: and two ends of the spring seat are provided with limiting blocks which can be abutted against the movable template.

7. An injection molding machine according to claim 1, wherein: the first driving mechanism is a quick oil cylinder, the second driving mechanism is an air cylinder, and the air cylinder is fixed on the movable template through an air cylinder seat.

8. An injection molding machine according to claim 1, wherein: the adjustable height adjusting mechanism is characterized in that the fixed template is provided with an adjusting mechanism for adjusting the height of the fixed template, the adjusting mechanism comprises a threaded section arranged on the upper part of the guide pillar, a nut sleeve in threaded fit with the threaded section, a belt pulley sleeved on the nut sleeve and belts surrounding the guide pillars, the belts are matched with the belt pulley, a flange is arranged outside the nut sleeve, and the flange is locked on the movable template through bolts.

9. An injection molding machine according to claim 1, wherein: the screw injection molding device comprises a mounting plate, an injection molding motor fixed on the mounting plate, a screw connected with the injection molding motor, a screw barrel matched with the screw and a third driving mechanism for driving the mounting plate to lift.

10. A method of operating an injection molding machine as claimed in claim 1, comprising the steps of:

(1) in the process that the first driving mechanism drives the movable template to move upwards to mold, the central shaft moves upwards along with the movable template;

(2) after the movable template and the fixed template are matched, the holding oil cylinder is started and pushes the first holding block to move forwards;

(3) the first clamping block moves to drive the gear through the first rack, the gear rotates to drive the second rack to move, so that the first clamping block and the second clamping block move relatively to each other and the central shaft is clamped, and preliminary mold locking is realized through the matching of the first anti-skid stripes and the second anti-skid stripes;

(4) the annular hydraulic cylinder is started and drives the annular piston to move upwards, and the top of the annular piston abuts against the bottom of the bottom plate to prevent the bottom plate from sliding downwards so as to realize complete mode locking;

(5) the screw injection molding device starts to inject materials into the mold;

(6) after the material is formed, the supporting mechanism resets, and the holding mechanism resets;

(7) the first driving mechanism drives the movable template to be far away from the fixed template to realize die opening.

Technical Field

The invention relates to an injection molding machine, in particular to an injection molding machine and a working method thereof.

Background

In order to meet these requirements, the structure of a conventional injection molding machine is roughly as follows, including: the structure frame consists of a fixed template, a movable template, a rear template and a guide post, and a power cylinder for transmitting motion and locking force; the guide post in the structure frame is arranged between the fixed die plate and the rear die plate, the movable die plate is sleeved on the guide post and can slide along the guide post, the power cylinder body is fixed on the rear die plate or the fixed die plate, the plunger or the piston rod of the power cylinder is connected with the movable die plate, and the movable die plate is driven to open and close the die and lock the die through the action of the power cylinder. The disadvantages of this structure are: firstly, the structural frame is unreasonable in arrangement, the sections of the adopted guide posts are all cylindrical, the friction between the movable template and the guide posts is sliding friction, the motion resistance is increased, parts are easy to wear, and the precision of mold closing is further influenced by the uneven wear and unadjustable structure of the four guide posts; the guide post, the fixed die plate and the rear die plate are connected into a rigid structure, the rack is fixed on a base of the injection molding machine, and the guide post not only guides but also bears locking force, so that deformation generated after stress cannot be compensated, and the precision of model closing is also influenced; secondly, the power cylinder has dual functions of fast moving and clamping, has fast action and slow action, has to be additionally provided with the booster cylinder, and the plunger or the piston rod of the booster cylinder follows up when the movable mould plate is opened and closed, so that the whole system becomes very complicated, the difficulty in control is increased, the parts of equipment are increased, the volume of an oil tank is increased, the movement load is increased, the integral cost is increased, the energy consumption is high, and the working benefit is low.

In order to solve the problems of the clamping mechanism of the traditional injection molding machine, a rapid clamping mechanism appears, for example, the clamping mechanism of the precise injection molding machine with Chinese patent publication No. CN103286928B comprises: the mould locking device comprises a structural frame, a quick moving mechanism of a movable mould plate and a mould locking oil cylinder mechanism, wherein the structural frame consists of a fixed mould plate, the movable mould plate, a rear mould plate and a guide pillar; the cross section of the guide post of the structural frame is rectangular, and rollers are arranged at four corners of the movable template on the upper/lower cylindrical surfaces of the guide post and the inner side surface of the guide post; the movable mould plate fast moving mechanism consists of a motor reduction box, a pair of gears and racks which are meshed with each other and a guide wheel, and the mould locking oil cylinder mechanism consists of four oil cylinders, a mould locking supporting plate and a transmission mechanism, and a through hole for a piston rod of the oil cylinder to penetrate through is arranged on the rear mould plate. The movable template enters a closed position of the movable template and the fixed template quickly by starting the movable template quick moving mechanism, then a transmission mechanism of the mold locking supporting plate is started to drive the mold locking supporting plate to rotate until cross-shaped fingers of the mold locking supporting plate completely cover through holes of a piston rod of an oil supply cylinder of the rear template and stop rotating, then an oil cylinder of the mold locking oil cylinder mechanism is started, the piston rod of the oil cylinder extends outwards until the piston rod of the oil cylinder is contacted with the mold locking supporting plate, and the movable template and the fixed template are completely closed under the driving of the mold locking oil cylinder to wait for injection molding. Therefore, after the movable mold and the fixed mold are assembled, the rotary supporting template is used as a supporting surface of the mold locking oil cylinder, and the movable mold is propped against the pressure of the mold locking oil cylinder to realize mold locking; the mold locking mechanism is high in required precision, and if the telescopic rod of the mold locking oil cylinder does not completely avoid the mold locking support plate, the mold locking support plate can collide with the telescopic rod of the oil cylinder after rotating; in addition, in order to shorten the stroke of the mold locking oil cylinder, when the movable mold closes the mold, the mold locking oil cylinder needs to move to enable the telescopic rod of the mold locking oil cylinder to extend, the more the telescopic rod extends, the larger the energy consumption is, and the extension amount of the telescopic rod of the mold locking oil cylinder needs to be matched with the movement of the mold locking supporting plate tightly to realize quick mold locking, so that the complexity of a mold locking system is increased.

Disclosure of Invention

The invention aims to solve the technical problem of providing an injection molding machine and a working method thereof, which have the advantages of high mold locking speed, high mold locking reliability and energy saving.

In order to solve the technical problems, the technical scheme of the invention is as follows: an injection molding machine comprises a fixed template, a screw injection molding device arranged on the fixed template, a movable template arranged below the fixed template, a first driving mechanism used for driving the movable template and a mold arranged on the movable template; the pile-embracing device is arranged below the movable template;

the clasping mechanism comprises a first clasping block, a second clasping block arranged opposite to the first clasping block and a clasping oil cylinder connected with the first clasping block; a first arc-shaped surface is arranged in the middle of one surface of the first enclasping block, which is opposite to the second enclasping block, first guide grooves are arranged on two sides of the first arc-shaped surface, the outer sides of the first guide grooves extend forwards to form a first rack, and the first enclasping oil cylinder acts on one surface of the first enclasping block, which is far away from the second enclasping block; a second arc-shaped surface is arranged in the middle of one surface, opposite to the first clamping block, of the second clamping block, two sides of the second arc-shaped surface extend forwards to form a first guide block matched with the first guide groove, a plurality of teeth are arranged on two sides of the second clamping block to form a second rack, a gear is arranged between the first rack and the second rack, and the gear is meshed with the first rack and the second rack respectively; the first arc-shaped surface and/or the second arc-shaped surface are/is provided with inner anti-skid stripes, and the outer surface of the central shaft is provided with outer anti-skid stripes; the first enclasping block and the second enclasping block are arranged in a guide channel, the guide channel comprises a bottom plate, a top plate and side plates arranged on two sides, and openings for the first enclasping block and the second enclasping block to extend out are formed in two ends of the guide channel; the supporting mechanism comprises an annular hydraulic cylinder, and the annular hydraulic cylinder comprises a cylinder body with an annular piston cavity, a cylinder cover matched with the cylinder body and an annular piston arranged in the annular piston cavity; the center of the cylinder body is provided with a first guide hole for the central shaft to pass through; the part of the annular piston extending out of the cylinder body forms a supporting part and can support the bottom of the bottom plate;

the die moving device comprises a movable die plate, spring seats arranged on two sides of the movable die plate, sliding rails arranged at the bottoms of the spring seats, sliding blocks arranged on the movable die plate and matched with the sliding rails, supporting seats arranged at the bottom of the movable die plate, a second driving mechanism used for driving the movable die plate to translate and an ejector rod mechanism arranged on the movable die plate; the die is arranged on the movable die plate, guide grooves are formed in two sides of the movable die plate, the upper portion of the spring seat extends into the guide grooves, a spring is arranged between the top of the spring seat and the movable die plate, a positioning pin is arranged on the spring seat, a positioning hole is formed in the movable die plate corresponding to the positioning pin, and the positioning pin extends into the positioning hole; a first gap is arranged between the top surface of the spring seat and the movable template, a second gap is arranged between the bottom surface of the supporting seat and the movable template, and the width of the first gap is larger than that of the second gap.

The pile embracing device can realize quick and reliable mold locking action of the injection molding machine; after the movable template is assembled, the clamping mechanism can quickly clamp a central shaft connected with the movable template, the movable template is supported by the clamping central shaft, and the first clamping block and the second clamping block of the clamping mechanism are sleeved on the central shaft, so that the central shaft can be quickly clamped after starting, and the action of quickly locking the mold is further realized; the inner anti-slip stripes are arranged on the holding surfaces of the first holding block and/or the second holding block, and the outer anti-slip stripes are arranged on the outer surface of the central shaft, so that the central shaft is prevented from slipping; after the holding mechanism acts, the annular hydraulic cylinder acts, and because the annular hydraulic cylinder is fixed with the relative position of the bottom plate supporting the holding mechanism, the distance between the annular piston and the bottom plate is the stroke of the annular piston, the stroke of the annular hydraulic cylinder can be shortened by adjusting the distance, so that the annular hydraulic cylinder can rapidly support the bottom plate, the action of double locking is played, the reliability of the locking is higher, and meanwhile, the energy is saved.

As an improvement, the enclasping oil cylinder is fixed on the bottom plate, and an output shaft of the enclasping oil cylinder is connected with the first enclasping block through a connecting plate; the top plate is provided with a first through hole for the central shaft to pass through, the top plate consists of two symmetrical top plate units, and two sides of each top plate unit are locked on the tops of the side plates through bolts; the bottom plate is provided with a second through hole for the central shaft to pass through, the bottom plate is provided with connecting lugs extending towards two opposite directions, and the end parts of the connecting lugs are sleeved on the guide posts.

As an improvement, the cylinder body is square, a plurality of fixing holes are formed in the cylinder body, and the first driving mechanism and the guide pillar are fixed on the cylinder body.

As an improvement, a first supporting part is formed on the inner side of the annular piston cavity on the cylinder body, a second supporting part is formed on the outer side of the annular piston cavity on the cylinder body, the supporting part of the annular piston extending out of the cylinder body protrudes inwards to form a limiting part which is abutted against the top of the first supporting part, the cylinder cover comprises a connecting part and a plugging part, the connecting part is fixed on the top of the second supporting part through a bolt, and oil seals are arranged between the inner side of the plugging part and the outer side of the supporting part and between the outer side of the plugging part and the outer wall of the annular piston.

As an improvement, the top of the first anti-skid stripe is a plane, and the bottom of the first anti-skid stripe is an inclined plane; the bottom of the second anti-skid stripe is a plane, and the top of the second anti-skid stripe is an inclined plane.

As an improvement, two ends of the spring seat are provided with limit blocks which can be abutted against the movable template.

As an improvement, the first driving mechanism is a quick oil cylinder, the second driving mechanism is an air cylinder, and the air cylinder is fixed on the movable template through an air cylinder seat.

As an improvement, the fixed template is provided with an adjusting mechanism for adjusting the height of the fixed template, the adjusting mechanism comprises a threaded section arranged at the upper part of the guide pillar, a nut sleeve in threaded fit with the threaded section, a belt pulley sleeved on the nut sleeve and belts surrounding the guide pillars, the belts are matched with the belt pulley, a flange is arranged outside the nut sleeve, and the flange is locked on the movable template through bolts.

As an improvement, the screw injection molding device comprises an installation plate, an injection molding motor fixed on the installation plate, a screw connected with the injection molding motor, a screw barrel matched with the screw and a third driving mechanism for driving the installation plate to lift.

The working method of the injection molding machine comprises the following steps:

(1) in the process that the first driving mechanism drives the movable template to move upwards to mold, the central shaft moves upwards along with the movable template;

(2) after the movable template and the fixed template are matched, the holding oil cylinder is started and pushes the first holding block to move forwards;

(3) the first clamping block moves to drive the gear through the first rack, the gear rotates to drive the second rack to move, so that the first clamping block and the second clamping block move relatively to each other and the central shaft is clamped, and preliminary mold locking is realized through the matching of the first anti-skid stripes and the second anti-skid stripes;

(4) the annular hydraulic cylinder is started and drives the annular piston to move upwards, and the top of the annular piston abuts against the bottom of the bottom plate to prevent the bottom plate from sliding downwards so as to realize complete mode locking;

(5) the screw injection molding device starts to inject materials into the mold;

(6) after the material is formed, the supporting mechanism resets, and the holding mechanism resets;

(7) the first driving mechanism drives the movable template to be far away from the fixed template to realize die opening.

Compared with the prior art, the invention has the following beneficial effects:

the pile embracing device can realize quick and reliable mold locking action of the injection molding machine; after the movable template is assembled, the clamping mechanism can quickly clamp a central shaft connected with the movable template, the movable template is supported by the clamping central shaft, and the first clamping block and the second clamping block of the clamping mechanism are sleeved on the central shaft, so that the central shaft can be quickly clamped after starting, and the action of quickly locking the mold is further realized; the inner anti-slip stripes are arranged on the holding surfaces of the first holding block and/or the second holding block, and the outer anti-slip stripes are arranged on the outer surface of the central shaft, so that the central shaft is prevented from slipping; after the holding mechanism acts, the annular hydraulic cylinder acts, and because the annular hydraulic cylinder is fixed with the relative position of the bottom plate supporting the holding mechanism, the distance between the annular piston and the bottom plate is the stroke of the annular piston, the stroke of the annular hydraulic cylinder can be shortened by adjusting the distance, so that the annular hydraulic cylinder can rapidly support the bottom plate, the action of double locking is played, the reliability of the locking is higher, and meanwhile, the energy is saved. The movable template can move the mold out of the injection molding machine, so that the mold is convenient to replace; because the spring is arranged between the spring seat and the movable template, the movable template is in a floating design, when the mold is closed, the mold is pushed by pressure to move the movable template downwards, and because the second gap between the supporting seat and the movable template is smaller than the first gap between the movable template and the spring seat, the supporting seat is firstly contacted with the movable template, so that the pressure applied to the spring seat by the movable template is shared, and the slide rail is prevented from being bent due to overlarge stress of the spring seat.

Drawings

FIG. 1 is a schematic view of an injection molding machine.

FIG. 2 is a schematic view of a mold transfer apparatus.

Fig. 3 is a schematic end view of a mold transfer device.

Fig. 4 is an exploded view of the fixed platen adjustment mechanism.

Fig. 5 is a schematic view of a nut sleeve.

Fig. 6 is a schematic view of a pile embracing device.

Figure 7 is an exploded view of the pilger device.

Figure 8 is a cross-sectional view of a pile embracing device.

Fig. 9 is a schematic diagram of a clasping state of the clasping mechanism.

Fig. 10 is a schematic view of the clasping mechanism in an unclamped state.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, an injection molding machine includes a fixed mold plate 2, a screw injection molding device 1 provided on the fixed mold plate 2, a movable mold plate 5 provided below the fixed mold plate 2, a driving mechanism 7 for driving the movable mold plate 5, a mold transfer device 4 mounted on the movable mold plate 5, a mold provided on the mold transfer device 4, and a pile holding device 6 provided below the movable mold plate 5. Four guide posts 3 are arranged between the movable template 5 and the fixed template 2, four corners of the fixed template are fixed on the guide posts 3 through nuts, guide holes matched with the guide posts 3 are formed in the movable template 5, the movable template 5 can be driven by the first driving mechanism 7 to be far away from or close to the fixed template 2, so that the action of opening or closing the mold is realized, and the first driving mechanism is a quick oil cylinder.

The screw injection molding device comprises a mounting plate, an injection molding motor fixed on the mounting plate, a screw connected with the injection molding motor, a screw barrel matched with the screw and a third driving mechanism for driving the mounting plate to lift.

As shown in fig. 4 and 5, an adjusting mechanism 8 for adjusting the height of the fixed die plate 2 is arranged on the fixed die plate 2, and the adjusting mechanism 8 includes a threaded section 31 arranged at the upper part of the guide pillar 3, a nut sleeve 81 in threaded fit with the threaded section 31, a belt pulley 82 sleeved on the nut sleeve 81, and a belt 83 surrounding each guide pillar 3; the belt 83 is matched with the belt pulleys 82, through the matching between the belt 83 and each belt pulley 82, the belt 83 can drive the four belt pulleys 82 to synchronously rotate once, and the belt pulleys 82 are connected with the nut sleeves 81, so that the four nut sleeves 81 can be driven to synchronously rotate, and finally, the effect of simultaneously adjusting the four corners of the fixed template 2 to simultaneously lift is achieved; the nut sleeve 81 is externally provided with a bearing 85, the fixed template 2 is provided with a bearing hole 21, the nut sleeve 81 is externally provided with a flange 84, the diameter of the flange 84 is larger than that of the bearing hole 21, the flange 84 is locked on the movable template 2 through bolts, when the height position of the fixed template 2 needs to be adjusted, the bolts on the flange 84 are loosened, the four nut sleeves 81 are synchronously rotated through the matching of a belt 83 and a belt pulley 82, the fixed template moves up and down along with the nut sleeve 81 relative to the thread section 31, and after the position of the fixed template is determined, the nuts on the flange are locked again to prevent the nut sleeves 81 from rotating.

As shown in fig. 2 and 3, the mold transfer device 4 includes a movable platen 41, elongated spring seats 46 provided on both sides of the movable platen 41, slide rails 45 provided at the bottom of the spring seats 46, slide blocks 44 provided on the movable platen 5 and engaged with the slide rails 45, a support seat 42 provided at the bottom of the movable platen 41, a second driving mechanism 48 for driving the movable platen 41 to translate, and a ram mechanism 43 provided on the movable platen 41. The second driving mechanism 48 is a cylinder formed sufficiently to push the movable die plate 41 out of the injection molding machine. The mold is provided on the movable die plate 41 and corresponds to the ejector mechanism 43. Guide grooves are formed in two sides of the movable template 41, the upper portion of the spring seat 46 extends into the guide grooves, a spring 49 and a positioning pin are arranged between the top of the spring seat 46 and the movable template 41, the spring 49 is sleeved on the positioning pin, a positioning hole is formed in the movable template 41 corresponding to the positioning pin, the positioning pin extends into the positioning hole, the movable template 41 can drive the spring seat 46 through the matching of the positioning pin and the positioning hole, and the spring seat 46 drives the sliding rail 45; a first gap 411 is arranged between the top surface of the spring seat 46 and the movable die plate 41, a second gap 421 is arranged between the bottom surface of the support seat 42 and the movable die plate 5, and the width of the first gap 411 is larger than that of the second gap 421. The second driving mechanism is matched with the movable template 41, so that the mold can be moved out of the injection molding machine, and the mold can be conveniently replaced; because the spring 49 is arranged between the spring seat 46 and the movable die plate 41, the movable die plate 41 is in a floating design, when the die is closed, the die is pushed by pressure to move the movable die plate 41 downwards, and because the second gap 421 between the supporting seat 42 and the movable die plate 5 is smaller than the first gap 411 between the movable die plate 41 and the spring seat 46, the supporting seat 42 is firstly contacted with the movable die plate 5, so that the pressure applied to the spring seat 46 by the movable die plate 41 is shared, and the sliding rail 45 is prevented from being bent due to overlarge stress of the spring seat 46.

As shown in fig. 6, the pile embracing device 6 includes a central shaft 63 connected to the movable formwork 5, a embracing mechanism 61 for embracing the central shaft 63, and a supporting mechanism 62 for supporting the embracing mechanism 61.

As shown in fig. 7, 9 and 10, the clasping mechanism 61 includes a first clasping block 612, a second clasping block 613 disposed opposite to the first clasping block 612, and a clasping cylinder 611 connected to the first clasping block 612. A first arc-shaped surface 6121 is arranged in the middle of one surface of the first clasping block 612 opposite to the second clasping block 613, the first arc-shaped surface 6121 is semicircular, and inner anti-skid stripes are arranged on the first arc-shaped surface 6121; two sides of the first arc-shaped surface 6121 are provided with first guide grooves 6122, and the outer sides of the first guide grooves 6122 extend forwards to form first racks 6123; the first enclasping cylinder 611 acts on one surface of the first enclasping block 612, which is far away from the second enclasping block 613, and an output shaft of the enclasping cylinder 611 is connected with the first enclasping block 612 through a connecting plate. A second arc-shaped surface 6131 is arranged in the middle of one surface of the second clasping block 613, which is opposite to the first clasping block 612, the second arc-shaped surface 6131 is semicircular, and the first arc-shaped surface 6121 and the second arc-shaped surface 6131 can be matched to form a circular clamping opening; two sides of the second arc-shaped surface 6131 extend forwards to form a first guide block 6132 matched with the first guide groove 6122; a plurality of teeth are arranged on two sides of the second clasping block 613 to form a second rack 6133, a gear 618 is arranged between the first rack 6123 and the second rack 6133, the gear 618 is respectively engaged with the first rack 6123 and the second rack 6133, the clasping cylinder 611 pushes the first clasping block 612, and the first clasping block 612 drives the second clasping block 613 to move relatively through the gear 618, so that clasping action is realized. The outer surface of the central shaft 63 is provided with outer anti-slip stripes which are matched with the inner anti-slip stripes on the first clasping blocks 612, and after the central shaft 63 is clasped by the first clasping blocks 612, the central shaft 63 can be prevented from sliding downwards through the staggered matching of the inner anti-slip stripes and the outer anti-slip stripes; the top of the first anti-skid stripe is a plane, and the bottom of the first anti-skid stripe is an inclined plane; the bottom of the second anti-skid stripe is a plane, and the top of the second anti-skid stripe is an inclined plane.

As shown in fig. 7, the first hugging block 612 and the second hugging block 613 are disposed in a guiding channel, the guiding channel includes a bottom plate 616, a top plate 614 and side plates 615 disposed at two sides, openings for the first hugging block 612 and the second hugging block 613 to extend are disposed at two ends of the guiding channel, and the guiding channel can make the movement of the first hugging block 612 and the second hugging block 613 more stable. The top plate 614 is provided with a first through hole for the central shaft 63 to pass through, the top plate 614 is composed of two symmetrical top plate 614 units, and two sides of the top plate 614 units are locked on the tops of the side plates 615 through bolts. The bottom plate 616 is provided with a second through hole for the central shaft 63 to pass through, the bottom plate 616 is provided with a connecting lug 617 extending towards two opposite directions, and the end of the connecting lug 617 is sleeved on the guide post 3, so as to fix the clasping mechanism 61.

As shown in fig. 7 and 8, the support mechanism 62 includes an annular hydraulic cylinder including a cylinder body 621 having an annular piston chamber, a cylinder head 622 fitted to the cylinder body 621, and an annular piston 623 disposed in the annular piston chamber. The cylinder 621 is square, a first guide hole for the central shaft 63 to pass through is formed in the center of the cylinder 621, and a plurality of fixing holes are formed in the cylinder 621 and used for mounting a first driving mechanism, a guide post 3 and other components. The portion of the annular piston 623 projecting out of the cylinder 621 forms a support portion 6231 and is able to support the bottom of the bottom plate 616; a first supporting portion 6211 is formed on the inner side of the annular piston cavity on the cylinder body 621, a second supporting portion 6212 is formed on the outer side of the annular piston cavity on the cylinder body 621, the supporting portion 6231 of the annular piston 623 extending out of the cylinder body 621 protrudes inwards to form a limiting portion 6232 which is abutted to the top of the first supporting portion 6211, the cylinder cover 622 comprises a connecting portion and a blocking portion, the connecting portion is fixed to the top of the second supporting portion through bolts, and oil seals are arranged between the inner side of the blocking portion and the outer side of the supporting portion and between the outer side of the blocking portion and the outer wall of the annular piston cavity.

The working method of the injection molding machine comprises the following steps:

(1) the central shaft 63 moves upwards along with the movable die plate 5 in the process of driving the movable die plate 5 to move upwards to mold by the first driving mechanism 77;

(2) after the movable template 5 and the fixed template 2 are matched, the enclasping oil cylinder 611 is started and pushes the first enclasping block 612 to move forwards;

(3) the first clasping block 612 moves to drive the gear 618 through the first rack 6123, the gear 618 rotates to drive the second rack 6133 to move, so that the first clasping block 612 and the second clasping block 613 move relatively to each other and the central shaft 63 is clasped, and preliminary mode locking is realized through the matching of the first anti-slip stripes and the second anti-slip stripes;

(4) the annular hydraulic cylinder is started and drives the annular piston 623 to move upwards, and the top of the annular piston 623 abuts against the bottom of the bottom plate 616 to prevent the bottom plate from sliding downwards so as to realize complete mode locking;

(5) the screw injection molding device 1 starts to inject materials into the mold;

(6) after the material is formed, the supporting mechanism resets 62, and the holding mechanism resets 61;

(7) the first driving mechanism 7 drives the movable template 5 to be far away from the fixed template 2 to realize die opening.