CN207432759U - The hot forming tool of lunch box with cover - Google Patents

Abstract

A kind of hot forming tool of lunch box with cover, including upper die and lower die；Upper mold includes cope plate, upper die body and upper cut-off-die；Lower die includes lower template, lower mold body, lower cut-off-die, box body shaping mould and box cover finishing die, it is characterized in that：The upper mold further includes hole punched device and binder ring；Hole punched device is in box body shaping mould one side, and hole punched device includes piercing knife, punching knife bar and punching tool apron, and punching knife bar upper end is connected with punching tool apron, and piercing knife is connected with punching knife bar lower end；Binder is located in the cavity of cut-off-die, the side wall of binder ring is equipped with punching knife bar guide hole and piercing knife guide hole, the lower ending opening of piercing knife guide hole is in the lower face of binder ring, and punching knife bar is in punching knife bar guide hole, and piercing knife is in piercing knife guide hole.The utility model can disposably complete shaping, punching and shearing manipulation, produce the plastic lunch box with cover that single box body edge carries jack, be conducive to improve production efficiency, and can ensure that punching position is accurate.

Description

The hot forming tool of lunch box with cover

Technical field

The utility model is related to thermal forming devices, and in particular to a kind of hot forming tool of lunch box with cover.

Background technology

Plastic lunch box generally comprises box body and box cover, and box cover a side is along integrally connected, box body is another with box body a side A side is inserted into along jack is equipped with for the inserted sheet being arranged on box cover opposite side edge.

Traditional thermoforming machine is equipped with molding machine, hole punched device successively when producing plastic lunch box usually in rack And shear, hot forming tool is equipped in molding machine.When making plastic lunch box, plastic sheet is heated first, makes plastics Sheet material reaches forming temperature；When plastic sheet by heating passes through molding machine, hot forming tool is molded plastic sheet； Molding plastic sheet then reaches hole punched device, by hole punched device in box body a side along upper punching；It is molded after punching Plastic sheet reach shear, plastic lunch box is cut out from molded plastic sheet coming by shear, obtains single A plastic lunch box.Since thermoforming machine needs to set mutually independent molding machine, hole punched device and shear, heat Shaping machine structure is not compact enough, and manufacture cost is higher, and floor space is larger.Moreover, necessary position is accurate when punching and shearing, Qualified plastic lunch box can be obtained, therefore it is required that hole punched device and shear can carry out accurately molded plastic sheet Positioning, but most of hole punched devices and shear can't be accurately positioned molded plastic sheet at present, so that Punching position, clipped position are often offset slightly from the position of actual requirement, generate more substandard products and waste product.

It is existing a kind of for making the hot forming tool of plastic lunch box, shaping, shear action can be completed.It is this heat into Pattern tool includes upper die and lower die；Upper mold includes cope plate, upper die body and upper cut-off-die, and upper die body is mounted on cope plate and is in Below cope plate, upper cut-off-die is mounted on upper die body and is in below upper die body, and upper cut-off-die has a cavity（Under usually upper cut-off-die The inner edge at end is upper shearing knife edge）；Lower die includes lower template, lower mold body, lower cut-off-die, box body shaping mould and box cover finishing die, under Die body is mounted in lower template and is in above lower template, and lower cut-off-die is mounted in lower mold body and is in above lower mold body（Usually The outer rim of lower cut-off-die upper end is down cut blade, and down cut blade matches with upper shearing knife edge）, box body shaping mould and box cover into Shape mould is installed in lower mold body and the inside in lower cut-off-die.When making plastic lunch box, plastic sheet is heated first, makes modeling Media sheet reaches forming temperature；Plastic sheet by heating is by forming area, hot forming tool molding at this time, through positive pressure heat Shaping or negative pressure thermoforming, make plastic sheet be close to box body shaping mould and box cover finishing die；Formed sheet after shaping is cut from above Cutoff edge and down cut blade complete shear action, and plastic lunch box is cut out coming from formed sheet, obtains single plastics Lunch box then makes plastic lunch box depart from hot forming tool again.Then the plastic lunch box obtained after hot forming tool is demoulded again turns The hole punched device in addition set is moved on to, goes out jack at box body edge, it is necessary to increase staff and equipment investment, production efficiency It is relatively low；Moreover, plastic lunch box must be accurately positioned during punching, if punching position is offset slightly from the position of actual requirement It puts, then will generate substandard products and waste product.

The content of the invention

The technical problem to be solved by the utility model is to provide a kind of hot forming tool of lunch box with cover, this thermoformings Mold can disposably complete shaping, punching and shearing manipulation, produce the plastics with cover that single box body edge carries jack Lunch box.The technical solution of use is as follows：

A kind of hot forming tool of lunch box with cover, including upper die and lower die；Upper mold include cope plate, upper die body and on cut Mould, upper die body are mounted on cope plate and are in below cope plate, and upper cut-off-die is mounted on upper die body and is in below upper die body, Upper cut-off-die has a cavity；Lower die includes lower template, lower mold body, lower cut-off-die, box body shaping mould and box cover finishing die, lower mold body peace It in lower template and is in above lower template, lower cut-off-die is mounted in lower mold body and is in above lower mold body, box body shaping mould It is installed in box cover finishing die in lower mold body and is in the inside of lower cut-off-die, it is characterized in that：The upper mold further includes punching dress It puts and binder ring；Hole punched device is in box body shaping mould one side, and hole punched device includes piercing knife, punching knife bar and punching tool apron, Punching tool apron is mounted on upper die body, and punching knife bar upper end is connected with punching tool apron, and piercing knife is connected with punching knife bar lower end；Pressure Material is located in the cavity of cut-off-die, and the lower face of binder ring matches with the upper surface of lower cut-off-die and position is corresponding, pressure Expect that the side wall of ring is equipped with punching knife bar guide hole and piercing knife guide hole, punching knife bar guide hole and piercing knife guide hole are Trend, piercing knife guide hole are in the underface of punching knife bar guide hole up and down, and the lower ending opening of piercing knife guide hole is in binder The lower face of ring, the upper end of piercing knife guide hole are connected with the lower end of punching knife bar guide hole, and punching knife bar is in punching knife bar In guide hole, piercing knife is in piercing knife guide hole.

Under die opening state, binder ring declines, and piercing knife can be in retraction piercing knife guide hole.Above-mentioned hot forming tool is right Plastic sheet is molded, cool down after, when cut-off-die shears the formed sheet after setting with the cooperation of upper cut-off-die instantly, punching Knife is moved downward compared with lower cut-off-die, and binder ring then clamps formed sheet, the phase of binder ring and lower cut-off-die together with lower cut-off-die Position is remained unchanged, therefore, piercing knife is stretched out from piercing knife guide hole lower end, and jack is gone out on formed sheet.It is above-mentioned to cut Cut, punching is carried out at the same time, so as to obtain the single plastic lunch box with jack.

In preferred embodiment, above-mentioned hole punched device further includes piercing knife cushion pad, adjusting nut seat and pressure adjusting screw, adjusts Section nut seat is fixedly mounted on upper die body, has the screw hole moved towards up and down on adjusting nut seat, pressure adjusting screw is with adjusting The screw hole engagement of nut seat, punching tool apron are in the underface of pressure adjusting screw, and piercing knife cushion pad is arranged on pressure and adjusts spiral shell Between bar lower end and punching tool apron, pressure adjusting screw lower end and the top of piercing knife cushion pad are in close contact, piercing knife buffering The bottom of pad is in close contact with punching tool apron.By rotation pressure adjusting screw rod, the height and position of adjustable pressure adjusting screw, So as to adjust the compressed degree of piercing knife cushion pad, the punching pressure of piercing knife can be adjusted.Above-mentioned piercing knife buffering Pad can be made of elastic material, be preferably made of polyurethane elastomer.In more preferable scheme, set at the top of above-mentioned piercing knife cushion pad There is the gasket made of stainless steel or aluminium alloy, pressure adjusting screw lower end is in close contact with gasket, and gasket is buffered with piercing knife The top of pad is in close contact.

In a kind of concrete scheme, finishing die partition wall is equipped in above-mentioned lower cut-off-die, finishing die partition wall is in box body shaping Between mould and box cover finishing die；Binder ring is equipped with binder partition plate, and the cavity of binder ring is separated into two parts by binder partition plate, presses The lower face of material partition plate matches with the upper surface of finishing die partition wall and position is corresponding.During molding, binder ring is by sheet material It is pressed on lower cut-off-die, while sheet material is pressed on finishing die partition wall by binder partition plate, the portion that sheet material is compressed by binder partition plate Divide the connecting portion formed between box cover and box body.

Above-mentioned binder ring can move up and down in the cavity of upper cut-off-die, and sheet material is pressed on lower cut-off-die by binder ring during molding On.In one concrete scheme, it equipped with compression spring between binder ring and cope plate, can treat binder ring when compressing spring contraction Molding plastic sheet applies certain pressure.Have sealing ring in another concrete scheme, on the outside of binder ring, make binder ring upper end with The cavity inner wall of upper cut-off-die forms pressure air chamber（Upper mold is equipped with the compressed gas passage connected with the pressure air chamber）, pressure gas Room can be passed through compressed gas, and binder ring is enable to treat molding plastic sheet and applies certain pressure.In another concrete scheme, Equipped with compression spring between binder ring and cope plate, and there is sealing ring on the outside of binder ring, make binder ring upper end and upper cut-off-die Cavity inner wall forms pressure air chamber（Upper mold is equipped with the compressed gas passage connected with the pressure air chamber）, using compression spring and The combination of compressed gas makes binder ring treat the certain pressure of molding plastic sheet application.

In preferred embodiment, above-mentioned upper mold further includes drawing mechanism, drawing mechanism include box body stretching head, box body stretch rod, Box cover stretching head, box cover stretch rod, stretch rod installing plate and stretch rod installing plate lifting control mechanism；Box body stretching head and box cover Stretching head is in the cavity of binder ring, and box body stretching head is in the surface of box body shaping mould, and box cover stretching head is in box The surface of lid finishing die, box body stretch rod lower end connection box body stretching head, box cover stretch rod lower end connection box cover stretching head, box Body stretch rod upper end and box cover stretch rod upper end extend out to above cope plate and connect stretch rod installing plate, stretch rod installing plate Connect stretch rod installing plate lifting control mechanism.Above-mentioned stretch rod installing plate lifting control mechanism can be arranged on cope plate；Upper In the case that mould is fixed in rack, stretch rod installing plate lifting control mechanism can be also arranged in rack.Stretch rod installing plate liter Drop control mechanism passes through box body stretch rod, the drive box body drawing of box cover stretch rod for stretch rod installing plate to be driven to move up and down Extension head, box cover stretching head move up and down in the cavity of binder ring simultaneously.It is drawn when stretch rod installing plate lifting control mechanism drives When boom installing plate lifts, stretch rod installing plate, box body stretch rod, box cover stretch rod, box body stretching head, box cover stretching head are together Lifting, box body stretching head and box cover stretching head are treated formed sheet when declining and are pre-stretched.Stretch rod installing plate elevating control Mechanism may include draft cylinder, and stretch rod installing plate connects the piston rod of draft cylinder；The cylinder body of draft cylinder can be mounted on upper In template；In the case where upper mold is fixed in rack, the cylinder body of draft cylinder can be also mounted in rack.

In a kind of preferred embodiment, above-mentioned box body shaping mould includes box body side mould and box body movable die block, the installation of box body side mould In lower mold body and the inside in lower cut-off-die, box body movable die block are arranged on the inside of box body side mould；Box cover finishing die includes box Gai Bianmo, can compared with box cover while the first box cover movable mold that mould lifts and can be compared with box cover while mould and the first box cover live Second box cover movable mold of dynamic model lifting, box cover side mould is fixedly mounted in lower mold body and the inside in lower cut-off-die, the first box Lid movable mold is arranged on the inside of box cover side mould, and the second box cover movable mold is arranged on the inside of the first box cover movable mold；Lower die further includes Box body knock-pin, box cover knock-pin, knock-pin installing plate, inner top panel and inner top panel lifting cylinder；Knock-pin installing plate is arranged on down Below template, box body knock-pin upper end is connected with box body movable die block, and box cover knock-pin upper end is connected with the second box cover movable mold, Box body knock-pin lower end and box cover knock-pin lower end extend out to below lower template and connect knock-pin installing plate；It is set in lower mold body There is inner top panel cavity volume, inner top panel is arranged in inner top panel cavity volume, and the first box cover movable mold lower end is connected with inner top panel, inner top panel lifting The cylinder body of cylinder is fixedly mounted in lower template, and the piston rod of inner top panel lifting cylinder is connected upward and with inner top panel.Work as box body When shaping mould is in shaping desired position, box body side mould and box body movable die block collectively form opposite with the box body of plastic lunch box The box body shaping mould answered；When box cover shaping mould is in shaping desired position, box cover side mould, the first box cover movable mold and second Box cover movable mold collectively forms and the corresponding box cover shaping mould of the box cover of plastic lunch box.The lifting of above-mentioned first box cover movable mold By one elevating mechanism, that is, inner top panel lifting cylinder control, the lifting of the second movable mold and box body movable die block is by another elevating mechanism （Drive the mechanism of knock-pin installing plate lifting）Control, by setting the stroke of two elevating mechanisms, it can be achieved that two stage mold unloading （Wherein box cover two stage mold unloading, the demoulding of box body level-one）：In first order knockout course, the first box cover movable mold, the activity of the second box cover Mould is synchronous with box body movable die block to be risen, and the edge of box cover is made to depart from side mould；In second level knockout course, the second box cover movable mold Continue to rise with box body movable die block, and plastic lunch box is ejected.

In more preferable scheme, above-mentioned lower template is equipped with the positive guide post of pipe moved towards up and down, manages positive guide post upper end and lower template Connection, knock-pin installing plate, which is equipped with, manages positive guide sleeve, manages positive guide post and is in the positive guide sleeve of pipe.Knock-pin installing plate is compared with lower die When plate lifts, manage positive guide sleeve and slided along positive guide post is managed, bootable knock-pin installing plate, box body knock-pin, box cover knock-pin are more Smoothly lift.

In more preferable scheme, above-mentioned lower template is equipped with the limit shaft moved towards up and down, and knock-pin installing plate is equipped with /V Through hole, limit shaft are in limiting through hole, and limit shaft lower end is socketed with lower limit washer, and lower limit washer is in knock-pin installation Below plate.During knock-pin installing plate declines, when the lower surface of knock-pin installing plate touches the upper surface of lower limit washer When, knock-pin installing plate no longer declines.

In another preferred embodiment, above-mentioned box body shaping mould includes box body side mould and box body movable die block, box body Bian Moan In lower mold body and the inside in lower cut-off-die, box body movable die block are arranged on the inside of box body side mould；Box cover finishing die includes Box cover side mould and box cover movable die block, box cover side mould is mounted in lower mold body and the inside in lower cut-off-die, box cover movable die block Arranged on the inside of box body side mould；Lower die further includes box body knock-pin, box cover knock-pin and knock-pin installing plate, knock-pin installing plate Below lower template, box body knock-pin upper end is connected with box body movable die block, box cover knock-pin upper end and box cover movable die block Connection, box body knock-pin lower end and box cover knock-pin lower end extend out to below lower template and connect knock-pin installing plate.Work as box When body formed mould is in shaping desired position, box body side mould and box body movable die block collectively form the box body phase with plastic lunch box Corresponding box body shaping mould；When box cover shaping mould is in shaping desired position, box cover side mould, the common structure of box cover movable die block Into with the corresponding box cover shaping mould of the box cover of plastic lunch box.The lifting of above-mentioned box body movable die block and box cover movable die block is by driving The mechanism controls of dynamic knock-pin installing plate lifting, after the shaping and shearing of completing box body and box cover, knock-pin installing plate rises, band Dynamic box body movable die block and box cover movable die block rise together, and plastic lunch box is ejected.

In more preferable scheme, above-mentioned lower template is equipped with the positive guide post of pipe moved towards up and down, manages positive guide post upper end and lower template Connection, knock-pin installing plate, which is equipped with, manages positive guide sleeve, manages positive guide post and is in the positive guide sleeve of pipe.Knock-pin installing plate is compared with lower die When plate lifts, manage positive guide sleeve and slided along positive guide post is managed, bootable knock-pin installing plate, box body knock-pin, box cover knock-pin are more Smoothly lift.

In more preferable scheme, above-mentioned lower template is equipped with the limit shaft moved towards up and down, and knock-pin installing plate is equipped with /V Through hole, limit shaft are in limiting through hole, and limit shaft lower end is socketed with lower limit washer, and lower limit washer is in knock-pin installation Below plate.During knock-pin installing plate declines, when the lower surface of knock-pin installing plate touches the upper surface of lower limit washer When, knock-pin installing plate no longer declines.

The shape and size design in the hole that the cutting edge shape and size of above-mentioned piercing knife are beaten as needed（The lower end of piercing knife For blade）, it is common for linear type blade.

The inner edge of usually upper cut-off-die lower end is upper shearing knife edge, and the outer rim of lower cut-off-die upper end is down cut blade, down cut Blade matches with upper shearing knife edge.

In addition, to shorten molding cycle, circulating cooling water route in mold is usually also set up, shaping mould is cooled down, is made Product fast cooling shaping.

During shaping, it can be fixed on upper mold in rack, lower die is lifted compared with upper mold；Can also lower die be fixed on rack On, upper mold is lifted compared with lower die.

The utility model is equipped with box body shaping mould, box cover finishing die, upper cut-off-die, lower cut-off-die and hole punched device, hole punched device In box body shaping mould one side, shaping, punching and shearing manipulation can be disposably completed, single box body edge is produced and carries The plastic lunch box with cover of jack is conducive to improve production efficiency, and can ensure that punching position is accurate, it is ensured that product quality.

Description of the drawings

Fig. 1 is the structure diagram of the preferred embodiment in the utility model（Molding state）；

Fig. 2 is the enlarged drawing of part A in Fig. 1.

Specific embodiment

As depicted in figs. 1 and 2, the hot forming tool of this lunch box with cover includes upper mold 1 and lower die 2.

Lower die 2 includes lower template 21, lower mold body 22, lower cut-off-die 23, box body shaping mould 24 and box cover finishing die 25, lower mold body 22 are mounted in lower template 21 and are in 21 top of lower template, and lower cut-off-die 23 is mounted in lower mold body 22 and is in lower mold body 22 Side, box body shaping mould 24 and box cover finishing die 25 are installed in lower mold body 22 and the inside in lower cut-off-die 23.

In the present embodiment, box body shaping mould 24 includes box body side mould 241 and box body movable die block 242, and box body side mould 241 is pacified In lower mold body 22 and the inside in lower cut-off-die 23, box body movable die block 242 are arranged on the inside of box body side mould 241；Box cover Finishing die 25 include box cover while mould 251, can be compared with box cover while mould 251 lift the first box cover movable mold 252 and can be opposite In the second box cover movable mold 253 that box cover side mould 251 and the first box cover movable mold 252 lift, box cover side mould 251 is fixedly mounted on In the lower mold body 22 and inside in lower cut-off-die 23, the first box cover movable mold 252 are arranged on the inside of box cover side mould 251, the second box Lid movable mold 253 is arranged on the inside of the first box cover movable mold 252；Lower die 2 further include box body knock-pin 26, box cover knock-pin 27, Knock-pin installing plate 28, inner top panel 29 and inner top panel lifting cylinder 210；Knock-pin installing plate 28 is arranged on 21 lower section of lower template, box 26 upper end of body knock-pin is connected with box body movable die block 242, and 27 upper end of box cover knock-pin is connected with the second box cover movable mold 253, 26 lower end of box body knock-pin and 27 lower end of box cover knock-pin extend out to 21 lower section of lower template and connect knock-pin installing plate 28；Under In die body 22 be equipped with inner top panel cavity volume 211, inner top panel 29 be arranged on inner top panel cavity volume 211 in, 252 lower end of the first box cover movable mold with Inner top panel 29 connects, and the cylinder body 2101 of inner top panel lifting cylinder 210 is fixedly mounted in lower template 21, inner top panel lifting cylinder 210 piston rod 2102 is connected upward and with inner top panel 29.When box body shaping mould 24 is in shaping desired position, box body side Mould 241 and box body movable die block 242 collectively form and the corresponding box body shaping mould of the box body of plastic lunch box；When box cover shaping mould 25 in shaping desired position when, 253 common structure of box cover side mould 251, the first box cover movable mold 252 and the second box cover movable mold Into with the corresponding box cover shaping mould of the box cover of plastic lunch box.Lower template 2 is equipped with the positive guide post 212, Guan Zheng of pipe moved towards up and down 212 upper end of guide post is connected with lower template 21, and knock-pin installing plate 28, which is equipped with, manages positive guide sleeve 213, manages positive guide post 212 and is being in pipe just In guide sleeve 213；When knock-pin installing plate 28 is lifted compared with lower template, manage positive guide sleeve 213 and slided along the positive guide post 212 of pipe, can be drawn Knock-pin installing plate 28, box body knock-pin 26, box cover knock-pin 27 is led more smoothly to lift.Lower template 21 is equipped with to walk up and down To limit shaft 214, knock-pin installing plate 28 is equipped with limiting through hole 215, and limit shaft 214 is in limiting through hole 215, /V 214 lower end of axis is socketed with lower limit washer 216, and lower limit washer 216 is in 28 lower section of knock-pin installing plate；Knock-pin installing plate During 28 decline, when the lower surface of knock-pin installing plate 28 touches the upper surface of lower limit washer 214, knock-pin installation Plate 28 no longer declines.

Upper mold 1 includes cope plate 11, upper die body 12, upper cut-off-die 13, hole punched device 14 and binder ring 15.Upper die body 12 is installed On cope plate 11 and it is in below cope plate 11, upper cut-off-die 13 is mounted on upper die body 12 and is in 12 lower section of upper die body, on Cut-off-die 13 has a cavity.

Hole punched device 14 is in 24 one side of box body shaping mould, and hole punched device 14 includes piercing knife 141, punching knife bar 142, punching Hole tool apron 143, piercing knife cushion pad 144, adjusting nut seat 145 and pressure adjusting screw 146,142 upper end of punching knife bar and punching Hole tool apron 143 connects, and piercing knife 141 is connected with 142 lower end of punching knife bar, and adjusting nut seat 145 is fixedly mounted on upper die body 12 On, there is the screw hole moved towards up and down, pressure adjusting screw 146 and the screw hole of adjusting nut seat 145 are nibbled on adjusting nut seat 145 It closes, punching tool apron 143 is in the underface of pressure adjusting screw 146, and piercing knife cushion pad 144 is arranged on pressure adjusting screw 146 Between lower end and punching tool apron 143,144 top of piercing knife cushion pad is equipped with the gasket 147 made of stainless steel or aluminium alloy, pressure 146 lower end of power adjusting screw rod is in close contact with gasket 147, and gasket 147 and the top of piercing knife cushion pad 144 are in close contact, punching The bottom of hole knife cushion pad 144 is in close contact with punching tool apron 143（Pass through piercing knife cushion pad 144, gasket 147, adjusting nut Punching tool apron 143 is mounted on upper die body by seat 145 and pressure adjusting screw 146）.Piercing knife cushion pad 144 is by polyurethane bullet Property system into.

Binder ring 15 is arranged in the cavity of upper cut-off-die 13, and the lower face of binder ring 15 and the upper surface of lower cut-off-die 23 match And position is corresponding, and the side wall of binder ring 15 is equipped with punching knife bar guide hole 151 and piercing knife guide hole 152, piercing knife Bar guide hole 151 and piercing knife guide hole 152 are that trend, piercing knife guide hole 152 are in punching knife bar guide hole 151 up and down Underface, the lower ending opening of piercing knife guide hole 152 in the lower face of binder ring 15, the upper end of piercing knife guide hole 152 with The lower end connection of punching knife bar guide hole 151, punching knife bar 142 are in punching knife bar guide hole 151, and piercing knife 141 is in In piercing knife guide hole 152.

In the present embodiment, upper mold 1 further includes drawing mechanism, drawing mechanism include box body stretching head 16, box body stretch rod 17, Box cover stretching head 18, box cover stretch rod 19, stretch rod installing plate 110 and stretch rod installing plate lifting control mechanism；Box body stretches First 16 and box cover stretching head 18 arranged on binder ring 15 cavity in, box body stretching head 16 be in box body shaping mould 24 just on Side, box cover stretching head 18 are in the surface of box cover finishing die 25,17 lower end of box body stretch rod connection box body stretching head 16, box cover 19 lower end of stretch rod connection box cover stretching head 18,17 upper end of box body stretch rod and 19 upper end of box cover stretch rod extend out to cope plate 11 tops simultaneously connect stretch rod installing plate 110, and stretch rod installing plate 110 connects stretch rod installing plate lifting control mechanism.It stretches Bar installing plate lifting control mechanism can be arranged on cope plate；In the case where upper mold is fixed in rack, stretch rod installing plate liter Dropping control mechanism can also be arranged in rack.Stretch rod installing plate lifting control mechanism is used to drive stretch rod installing plate about 110 Movement, and pass through box body stretch rod 17, the drive box body of box cover stretch rod 19 stretching head 16, box cover stretching head 18 simultaneously in binder ring It moves up and down in 15 cavity.When stretch rod installing plate lifting control mechanism driving stretch rod installing plate 110 lifts, stretch rod Installing plate 110, box body stretch rod 17, box cover stretch rod 19, box body stretching head 16,18 1 lifting of box cover stretching head, box body are drawn Extension head 16 and box cover stretching head 18 are treated formed sheet when declining and are pre-stretched.Stretch rod installing plate lifting control mechanism can wrap Draft cylinder is included, stretch rod installing plate connects the piston rod of draft cylinder；The cylinder body of draft cylinder can be mounted on cope plate； In the case that upper mold is fixed in rack, the cylinder body of draft cylinder can be also mounted in rack.

In the present embodiment, finishing die partition wall 217 is equipped in lower cut-off-die 23, finishing die partition wall 217 is in box body shaping Between mould 24 and box cover finishing die 25；Binder ring 15 is equipped with binder partition plate 153, and binder partition plate 153 is by the cavity of binder ring 15 It is separated into two parts, lower face and the upper surface of finishing die partition wall 217 of binder partition plate 153 match and position is opposite It should.During molding, sheet material is pressed on lower cut-off-die 23 by binder ring 15, while sheet material is pressed on finishing die point by binder partition plate 153 On next door 217, the part that sheet material is compressed by binder partition plate 153 forms the connecting portion between box cover and box body.

The present embodiment makes binder ring treat molding plastic sheet application one using the combination of compression spring and compressed gas Fixed pressure.In the present embodiment, 15 top of binder ring is set there are two lower guide section 154, and two lower 154 tops of guide section are set respectively There are guide section 155 on one；It is set on upper die body 11 there are two the lower pilot hole 111 that moves towards up and down, two lower guide sections 154 and two Lower pilot hole 111 corresponds, and lower guide section 154 is in lower pilot hole 111 and matches somebody with somebody with the inner wall slip of lower pilot hole 111 It closes；Lower 154 outside of guide section is equipped with sealing ring 112, makes to be formed between lower 154 top of guide section and upper die body 12 and cope plate 11 Pressure air chamber 113, pressure air chamber 113 connect with the compressed gas passage 114 on cope plate 11；Cope plate 11 is equipped with two The upper pilot hole 115 of a trend up and down, guide section 155 is corresponded with pilot hole on two 115 on two, and upper guide section 155 is in It is slidably matched in upper pilot hole 115 and with the inner wall of upper pilot hole 115；The top of upper guide section 155 is equipped with external thread section 156, Adjusting nut 116 is installed on external thread section 156；Compression spring 117,117 upper end of compression spring are socketed on upper guide section 155 It is in close contact with cope plate 11, lower end is in close contact with lower 154 top of guide section.By adjusting the pressure into pressure air chamber 113 The air pressure of contracting gas can adjust the pressure of binder ring.When upper mold 1 is separated with lower die 2, in gravity and being total to for spring 117 is compressed Under same-action, upper cut-off-die 13 is stretched out in the lower end of binder ring 15；By adjusting installation of the adjusting nut 116 on external thread section 156 The length of the lower end extension of binder ring 15 is adjusted in position.The drawing of about one trend is respectively equipped on two in guide section 155 Boom pilot hole 157, in 17 stretch rod pilot hole 157 within which of box body stretch rod and with the stretch rod pilot hole 157 Inner wall is slidably matched, box cover stretch rod 19 be in another stretch rod pilot hole 157 and with the inner wall of the stretch rod pilot hole 157 It is slidably matched.

The shape and size design in the hole that the cutting edge shape and size of piercing knife 141 are beaten as needed（The lower end of piercing knife For blade）, such as linear type blade.

The inner edge of upper 13 lower end of cut-off-die is upper shearing knife edge, and the outer rim of lower 23 upper end of cut-off-die is down cut blade, down cut Blade matches with upper shearing knife edge.

In addition, to shorten molding cycle, circulating cooling water route in mold is usually also set up, shaping mould is cooled down, is made Product fast cooling shaping.

The operation principle of brief description once this hot forming tool：

During shaping, upper mold 1 is fixed in rack, and lower die 2 is lifted compared with upper mold 1.

Before production, by rotation pressure adjusting screw rod 146, the height and position of pressure adjusting screw 146 is adjusted, is rushed with adjusting The compressed degree of hole knife cushion pad 144, is adjusted the punching pressure of piercing knife 141.

When making plastic lunch box, plastic sheet is heated first, plastic sheet is made to reach forming temperature；By the modeling of heating Media sheet passes through forming area, and lower die 2 rises at this time, hot forming tool molding, compresses spring 117 and enters pressure air chamber 113 Compressed gas apply downward thrust to binder ring 15 jointly, make binder ring 15 that sheet material to be pressed on to the upper surface of lower cut-off-die 23 On, while sheet material is pressed on finishing die partition wall 217 by binder partition plate 153, the cavity of plastic sheet and upper cut-off-die 13 it Between formed shaping gas chamber；It states then up in shaping gas chamber and is passed through compressed gas, under the action of compressed air, plastic sheet is tight Paste box body shaping mould 24 and box cover finishing die 25；Cooling water, 24 He of box body shaping mould are passed through with circulating cooling water route in rear mold Box cover finishing die 25 is cooled down, and formed sheet is shaped；Then lower die 2 further rises, and piercing knife 141 is cut under Mould 23 moves downward, and binder ring 15 then clamps formed sheet together with lower cut-off-die 23, and piercing knife 141 is from piercing knife guide hole 152 lower ends are stretched out, and jack is gone out on formed sheet, meanwhile, down cut blade and the upper cut-off-die 13 of lower 23 upper end outer rim of cut-off-die The upper shearing knife edge cooperation of lower end inner edge, shears the formed sheet after setting, plastic lunch box is cut from formed sheet It cuts out, obtains the single plastic lunch box with jack hole；Subsequent lower die 2 declines, and the edge of plastic lunch box leaves binder ring 15（Under die opening state, binder ring 15 declines, in 141 retraction piercing knife guide hole 152 of piercing knife）；Then, inner top panel lifts Cylinder 210 drives the first box cover movable mold 252 to rise compared with lower template 21 by inner top panel 29, and knock-pin installing plate 28 drives Box body knock-pin 26, box body movable die block 242, box cover knock-pin 27, the second box cover movable mold 253 are compared in lower template 21 It rises, plastic lunch box is ejected, plastic lunch box is made to depart from hot forming tool, so as to complete one-step hot moulding process.Then in lower die 2 It rising, box body movable die block 242, the first box cover movable mold 252 and the second box cover movable mold 253 return back to shaping desired position, Prepare thermoforming process next time.

In other embodiments, box body shaping mould includes box body side mould and box body movable die block, and box body side mould is mounted on down On the die body and inside in lower cut-off-die, box body movable die block are arranged on the inside of box body side mould；Box cover finishing die includes box cover side Mould and box cover movable die block, box cover side mould is mounted in lower mold body and the inside in lower cut-off-die, box cover movable die block are arranged on box The inside of body side mould；Lower die further includes box body knock-pin, box cover knock-pin and knock-pin installing plate, and knock-pin installing plate is arranged on down Below template, box body knock-pin upper end is connected with box body movable die block, and box cover knock-pin upper end is connected with box cover movable die block, box Body knock-pin lower end and box cover knock-pin lower end extend out to below lower template and connect knock-pin installing plate.When box body shaping mould During in shaping desired position, box body side mould and box body movable die block collectively form and the corresponding box of the box body of plastic lunch box Body formed mould；When box cover shaping mould is in shaping desired position, box cover side mould, box cover movable die block collectively forms and plastics The corresponding box cover shaping mould of box cover of lunch box.The lifting of above-mentioned box body movable die block and box cover movable die block is by driving knock-pin The mechanism controls of installing plate lifting, after the shaping and shearing of completing box body and box cover, knock-pin installing plate rises, and box body is driven to live Dynamic bed die and box cover movable die block rise together, and plastic lunch box is ejected.

Claims (10)

1. a kind of hot forming tool of lunch box with cover, including upper die and lower die；Upper mold includes cope plate, upper die body and upper cut-off-die, Upper die body is mounted on cope plate and is in below cope plate, and upper cut-off-die is mounted on upper die body and is in below upper die body, on Cut-off-die has a cavity；Lower die includes lower template, lower mold body, lower cut-off-die, box body shaping mould and box cover finishing die, lower mold body installation In lower template and be in above lower template, lower cut-off-die is mounted in lower mold body and is in above lower mold body, box body shaping mould and Box cover finishing die is installed in lower mold body and the inside in lower cut-off-die, it is characterized in that：The upper mold further includes hole punched device With binder ring；Hole punched device is in box body shaping mould one side, and hole punched device includes piercing knife, punching knife bar and punching tool apron, punching Hole tool apron is mounted on upper die body, and punching knife bar upper end is connected with punching tool apron, and piercing knife is connected with punching knife bar lower end；Binder It is located in the cavity of cut-off-die, the lower face of binder ring matches with the upper surface of lower cut-off-die and position is corresponding, binder The side wall of ring is equipped with punching knife bar guide hole and piercing knife guide hole, on punching knife bar guide hole and piercing knife guide hole be Lower trend, piercing knife guide hole are in the underface of punching knife bar guide hole, and the lower ending opening of piercing knife guide hole is in binder ring Lower face, the upper end of piercing knife guide hole connects with the lower end of punching knife bar guide hole, and punching knife bar, which is in punching knife bar, leads Draw in hole, piercing knife is in piercing knife guide hole.

2. hot forming tool according to claim 1, it is characterized in that：The hole punched device further include piercing knife cushion pad, Adjusting nut seat and pressure adjusting screw, adjusting nut seat are fixedly mounted on upper die body, have to walk up and down on adjusting nut seat To screw hole, pressure adjusting screw engages with the screw hole of adjusting nut seat, and punching tool apron is in the underface of pressure adjusting screw, Piercing knife cushion pad is arranged between pressure adjusting screw lower end and punching tool apron, pressure adjusting screw lower end and piercing knife cushion pad Top be in close contact, the bottom of piercing knife cushion pad is in close contact with punching tool apron.

3. hot forming tool according to claim 2, it is characterized in that：The piercing knife cushion pad is by elastic polyurethane system Into.

4. hot forming tool according to claim 2, it is characterized in that：It is equipped at the top of the piercing knife cushion pad by stainless steel Or gasket made of aluminium alloy, pressure adjusting screw lower end are in close contact with gasket, the top of gasket and piercing knife cushion pad is tight Contiguity is touched.

5. according to claim 1-4 any one of them hot forming tools, it is characterized in that：Equipped with finishing die point in the lower cut-off-die Next door, finishing die partition wall are between box body shaping mould and box cover finishing die；Binder ring is equipped with binder partition plate, binder partition plate The cavity of binder ring is separated into two parts, the lower face of binder partition plate matches with the upper surface of finishing die partition wall and position It puts corresponding.

6. according to claim 1-4 any one of them hot forming tools, it is characterized in that：The upper mold further includes drawing mechanism, Drawing mechanism includes box body stretching head, box body stretch rod, box cover stretching head, box cover stretch rod, stretch rod installing plate and stretch rod Installing plate lifting control mechanism；In the cavity of binder ring, box body stretching head is in for box body stretching head and box cover stretching head The surface of box body shaping mould, box cover stretching head are in the surface of box cover finishing die, and box body stretch rod lower end connection box body is drawn Extension head, box cover stretch rod lower end connection box cover stretching head, box body stretch rod upper end and box cover stretch rod upper end extend out to upper mold Above plate and stretch rod installing plate is connected, stretch rod installing plate connects stretch rod installing plate lifting control mechanism.

7. according to claim 1-4 any one of them hot forming tools, it is characterized in that：The box body shaping mould includes box body side Mould and box body movable die block, box body side mould is mounted in lower mold body and the inside in lower cut-off-die, box body movable die block are arranged on box The inside of body side mould；Box cover finishing die include box cover while mould, can be compared with box cover while mould lifting the first box cover movable mold and The the second box cover movable mold that can be lifted compared with box cover side mould and the first box cover movable mold, box cover side mould are fixedly mounted on lower mold body It goes up and is in the inside of lower cut-off-die, the first box cover movable mold is arranged on the inside of box cover side mould, and the second box cover movable mold is arranged on first The inside of box cover movable mold；Lower die further includes box body knock-pin, box cover knock-pin, knock-pin installing plate, inner top panel and inner top panel Lifting cylinder；Knock-pin installing plate is arranged below lower template, and box body knock-pin upper end is connected with box body movable die block, box cover ejection Bar upper end is connected with the second box cover movable mold, and box body knock-pin lower end and box cover knock-pin lower end are extend out to below lower template simultaneously Connect knock-pin installing plate；Inner top panel cavity volume is equipped in lower mold body, inner top panel is arranged in inner top panel cavity volume, the first box cover movable mold Lower end is connected with inner top panel, and the cylinder body of inner top panel lifting cylinder is fixedly mounted in lower template, the piston of inner top panel lifting cylinder Bar is connected upward and with inner top panel.

8. hot forming tool according to claim 7, it is characterized in that：The lower template is equipped with the pipe moved towards up and down and just leads Column is managed positive guide post upper end and is connected with lower template, and knock-pin installing plate, which is equipped with, manages positive guide sleeve, manages positive guide post and is in the positive guide sleeve of pipe In.

9. hot forming tool according to claim 7, it is characterized in that：The lower template is equipped with the /V moved towards up and down Axis, knock-pin installing plate are equipped with limiting through hole, and limit shaft is in limiting through hole, and limit shaft lower end is socketed with lower limit pad Circle, lower limit washer are in below knock-pin installing plate.

10. according to claim 1-4 any one of them hot forming tools, it is characterized in that：The box body shaping mould includes box body Side mould and box body movable die block, box body side mould is mounted in lower mold body and the inside in lower cut-off-die, box body movable die block are arranged on The inside of box body side mould；Box cover finishing die includes box cover side mould and box cover movable die block, and box cover side mould is mounted in lower mold body simultaneously In the inside of lower cut-off-die, box cover movable die block is arranged on the inside of box body side mould；Lower die further includes box body knock-pin, box cover ejection Bar and knock-pin installing plate, knock-pin installing plate are arranged below lower template, and box body knock-pin upper end is connected with box body movable die block, Box cover knock-pin upper end is connected with box cover movable die block, and box body knock-pin lower end and box cover knock-pin lower end extend out to lower template Lower section simultaneously connects knock-pin installing plate.