CN111267272A

CN111267272A - Demolding method for middle mold of vulcanizing machine

Info

Publication number: CN111267272A
Application number: CN202010179067.1A
Authority: CN
Inventors: 郑伟哲
Original assignee: Jiangshan Fafa Technology Co Ltd
Current assignee: Dalian Second Rubber And Plastics Machinery Co ltd
Priority date: 2020-03-15
Filing date: 2020-03-15
Publication date: 2020-06-12
Anticipated expiration: 2040-03-15
Also published as: CN115847672A; CN111267272B

Abstract

The invention relates to a demoulding method of a middle die of a vulcanizing machine, which comprises a machine base, a plurality of vertical guide upright posts, a lower clamping plate, an upper clamping plate, a lifting cylinder and a rubber die, wherein the lower ends of the vertical guide upright posts are connected to the machine base, the lower clamping plate is sleeved on a sliding post, the upper clamping plate is fixedly connected to the upper ends of the vertical guide upright posts, the lifting cylinder drives the lower clamping plate to lift, the rubber die is positioned between the upper clamping plate and the lower clamping plate and comprises an upper die, the middle die and a lower die, the lower clamping plate is positioned between the machine base and the upper clamping plate, the middle die and the upper die are hung on the upper clamping plate in a lifting manner, and the middle die and the lower die are separated from each other in the vertical direction when the middle die and. The invention provides a demoulding method of a middle mould of a vulcanizing machine, which can enable the middle mould to be separated from an upper mould by means of dead weight, and solves the problem of labor waste caused by manually separating the middle mould from the upper mould in the existing rubber mould production process.

Description

Demolding method for middle mold of vulcanizing machine

Technical Field

The invention relates to the technical field of rubber part processing, in particular to a demolding method for a middle mold of a vulcanizing machine.

Background

Rubber members such as a seal ring, a tire, and a rubber dust cover are processed by a vulcanizing machine. The vulcanizer includes mould, well mould, lower mould, frame, a plurality of vertical guide post, the lower grip block of cover on the traveller that the lower extreme is connected on the frame, rigid coupling are in the last grip block of vertical guide post upper end and the lift jar that the grip block goes up and down under the drive, and lower grip block is located between frame and the last grip block, and the lift jar setting is in between frame and the lower grip block. Wherein the upper die, the middle die and the lower die form a rubber die, and the middle die in the rubber die can penetrate into the upper die like the rubber die disclosed in the patent document with the patent number of 201910431106. When the rubber product is manufactured, the rubber mold is placed on the lower clamping plate, and then the lifting cylinder drives the lower clamping plate to ascend so as to be matched with the upper clamping plate to clamp the rubber mold. After vulcanization, the upper clamping plate is separated to take out the rubber mold, and then the upper mold, the middle mold and the lower mold are separated manually. The existing manual separation mode has the following defects: although the upper die and the lower die can be easily separated, the middle die can be separated by means of self weight only when the upper die is lifted in a mode of keeping the upper die horizontal, the mode of separating the middle die is not only laborious when the upper die is lifted manually, but also the middle die cannot be separated once the inclined angle generated when the upper die is lifted exceeds the range; in addition, the phenomenon that the middle mold of the platform is not detached occasionally occurs, and at the moment, the middle mold can be detached only by knocking the upper mold to generate vibration, so that the mode is not only labor-consuming but also low in efficiency.

Disclosure of Invention

The invention aims to provide a demoulding method of a middle mould of a vulcanizing machine, which can enable the middle mould to be separated from an upper mould by means of self weight, and solves the problem of labor waste caused by manually separating the middle mould from the upper mould in the existing rubber mould production process.

A second object of the present invention is to provide a method for releasing a middle mold of a vulcanizer capable of driving the release of the middle mold by providing an auxiliary force when the middle mold cannot be released, in addition to the first object, to improve the reliability of the release of the middle mold.

The technical problem is solved by the following technical scheme: the utility model provides a mould demoulding method in vulcanizer, vulcanizer includes that frame, lower extreme are connected a plurality of vertical guide post on the frame, the lower grip block of cover on the traveller, rigid coupling are in the last grip block of vertical guide post upper end, the lift jar that the grip block goes up and down under the drive and be located the rubber mold between last grip block and the lower grip block, rubber mold includes mould, well mould and lower mould, the grip block is located between frame and the last grip block down, the lift jar sets up between frame and the lower grip block, its characterized in that hangs well mould and last mould liftable on last grip block, well mould and lower mould are separated along upper and lower direction with the lower mould when all being in the extreme position to rely on gravity to make well mould throw off from the mould.

Preferably, the left end and the right end of the lower clamping plate are respectively connected with a suspension seat, an upper die suspension column and a middle die suspension column are arranged on the suspension seats in a penetrating manner, the upper end of the upper die suspension column is connected with an upper die suspension column part suspension block, the lower end of the upper die suspension column is connected with the upper die, the upper die is suspended on the suspension seat through the upper die suspension column part suspension block to realize the lifting connection with the upper clamping plate, the upper end of the middle die suspension column is connected with a middle die suspension column part suspension block, the lower end of the middle die suspension column is connected with the middle die, and the middle die is suspended on the suspension seats through the middle die suspension column part suspension block to realize; when the upper die suspension column is suspended on the suspension seat through the upper die suspension column part suspension block, the upper die is located at the lowest position, and when the middle die suspension column is suspended on the suspension seat through the middle die suspension column part suspension block, the middle die is located at the lowest position. When the clamping device is used, the lower die is placed on the lower clamping plate, during die assembly, the lower clamping plate is driven by the lifting cylinder to ascend, the lower clamping plate supports the lower die to be folded on the middle die and drives the middle die to ascend (the middle die hanging column moves upwards to generate avoidance), the middle die is inserted into the upper die and drives the upper die to ascend (the upper die hanging column moves upwards to generate avoidance), and finally the upper die moves to be abutted with the upper clamping plate to complete die assembly (namely the middle die is folded into the upper die, and the lower die is abutted to the lower end of the lower die). When the mold is opened, the lifting cylinder drives the lower clamping plate to descend, the upper mold, the middle mold and the lower mold both descend under the action of gravity, the upper mold stops descending when the upper mold hanging column part hanging block descends to abut against the upper surface of the hanging seat, and the middle mold stops descending when the middle mold hanging column part hanging block descends to abut against the upper surface of the hanging seat, so that the middle mold and the upper mold are automatically separated by means of gravity when the vulcanizing mold is separated.

Preferably, a controllable demolding power-assisting mechanism is arranged between the middle mold and the suspension seat, the controllable demolding power-assisting mechanism comprises a connecting seat, an impact head, a middle mold demolding spring positioned between the connecting seat and the impact head, a transverse sliding rod connected to the connecting seat, a sliding sleeve sleeved on the transverse sliding rod, a barb connected to the sliding sleeve, a release-stopping spring driving the sliding sleeve to move towards the connecting seat, and a vertical sliding rod arranged on the impact head, the upper end of the vertical sliding rod penetrates through the suspension seat and is provided with a release-stopping block of a vertical sliding rod part positioned above the suspension seat, the impact head is provided with a barb block, and the connecting seat is connected to the suspension seat; the barb is hooked on the barb block, and when the middle die is folded together under the action of the lower clamping plate, the middle die demoulding spring is in a compressed energy storage state, the impact head is staggered with the upper die, and the impact head is positioned right above the middle die and spaced from the middle die; when the upper die suspension column is suspended on the suspension seat through the upper die suspension column part suspension block and the barb is separated from the barb block, the middle die stripping spring can drive the impact head to impact the middle die folded on the upper die; when the lower clamping plate descends to the lower die and loses the supporting effect on the middle dies, the middle dies are still positioned in the upper die, the barbs are separated from the barb blocks, and the impact heads move downwards under the effect of the middle die demolding springs to impact the middle dies so as to assist the middle dies to be separated from the upper die. When the middle mold can not be separated by gravity, the sliding sleeve is translated to separate the barb from the barb block, the middle mold separation spring releases energy to push the impact head downwards, and the impact head impacts the middle mold to drive the middle mold to separate. After the controllable demoulding power-assisted mechanism is used, the barb is still hooked on the barb block, so that the middle mould demoulding spring is stored energy and is used for next demoulding. When the controllable demoulding power-assisted mechanism in the technical scheme is not used, the lifting of the lower clamping plate cannot be interfered to increase the load of the lifting cylinder in the mould closing process, so that the energy consumption cannot be increased or even the model of the lifting cylinder is changed due to the increase of the controllable demoulding power-assisted mechanism. The anti-drop spring is arranged, so that the connection between the barb and the barb block is more reliable. Controllable formula drawing of patterns assist drive device can the optional formula open, can avoid the tasteless action of well mould drawing of patterns spring, and the production of the tasteless action of well mould drawing of patterns spring can lead to the tasteless strain of well mould drawing of patterns spring, consequently this controllable formula drawing of patterns assist drive device can effectively prolong the life of well mould drawing of patterns spring.

Preferably, the lower end of the connecting seat is provided with a vertical thread head, the vertical thread head is in threaded connection with an upper connecting block, and the upper end of the middle die demolding spring is connected with the upper connecting block. The force of the middle die demolding spring when the impact head is bounced off can be adjusted, so that the situation that the impact force of the impact head is insufficient when the force required by the middle die in the assisting force is large and the impact force of the impact head is too large when the force required by the middle die in the assisting force is small is avoided (the situation that the middle die assisting spring deforms greatly when the force is too large and the situation that the spring fatigue is faster when the force is large when the force is too large).

Preferably, when the middle die suspension column is suspended on the suspension seat through the middle die suspension column part suspension block and the middle die demolding spring is in a free state, the impact head can press the upper surface of the middle die. The reliability in assisting power can be improved.

Preferably, the suspension block is provided with a transverse sliding column, the connecting seat is slidably sleeved on the transverse sliding column, and the connecting seat can slide to be staggered with the middle die along the horizontal direction. The controllable demolding assisting mechanism can not interfere with each other when resetting and mold closing are carried out in parallel, and the mold closing time period (the mold closing time period is the time period for inserting the middle mold into the upper mold in the mold closing process) and the resetting time period of the vulcanizing machine with the controllable demolding assisting force can be carried out in a staggered mode.

The invention also comprises a transverse pull rod, a movable block sleeved on the transverse sliding column, an impact head translation spring sleeved on the transverse sliding column, a vertical ejector rod connected on a lower clamping plate and used for ejecting the impact head, and a vertical ejector pin connected on the vertical ejector rod and used for ejecting the transverse pull rod, wherein the movable block is positioned on one side of the connecting seat far away from the upper clamping plate; the vertical ejector rod rises to lift the impact head until the barb is just hooked on the barb block, and the transverse pull rod still connects the movable block with the connecting seat; and the vertical ejector rod continues to rise, so that the vertical ejector pin jacks the transverse pull rod until the transverse pull rod is just separated from at least one of the connecting seat and the movable block, and the middle die and the lower die are still in a separated state. In the using process, when the lifting cylinder rises, the vertical ejector rod drives the impact head to be hooked with the barb together, so that the middle die demoulding spring stores energy; the horizontal pull rod is jacked up by the vertical thimble to enable the horizontal pull rod to lose the fixing effect on the movable block and the connecting seat, and after the horizontal pull rod loses the fixing effect on the movable block and the connecting seat, the horizontal pull rod strikes the head translation spring to drive the connecting seat to move above the middle mold and stagger with the vertical ejector rod, so that the middle mold elastic sheet spring cannot block the lifting of the lifting rod (namely cannot become the load of the lifting cylinder) when the lifting cylinder continues to lift; and finally, the middle die is driven to be folded into the upper die by the lifting cylinder (namely, the middle die enters the die assembly period). In the technical scheme, the process that the barb is folded on the impact head to extrude the middle die demoulding spring to reset and store energy is completed through the lifting cylinder, so that labor is saved; and the time interval of the energy storage by the contraction of the middle die demoulding spring and the time interval of the die assembly are staggered in the lifting cylinder driving, so that the load of the lifting cylinder can not be increased even though the middle die demoulding spring is driven by the lifting cylinder to store energy by the contraction. In the technical scheme, the transverse pull rod clamps the movable block and the connecting seat relatively to fix together and clamps the impact head translation spring to store energy manually.

Preferably, when the lower clamping plate rises to enable the middle die and the upper die to be closed, the vertical pin of the movable block part still penetrates through the movable block. The cross pull rod can be always connected with the movable block, so that the convenience in resetting the cross pull rod is improved, and the cross pull rod is prevented from falling off and being damaged.

Preferably, the lower end of the sliding block part vertical bolt is provided with a vertical bolt part anti-falling block positioned below the movable block. Can prevent that because inertial effect, the perpendicular bolt of sliding block portion deviates from the movable block and leads to the drag link to separate with the movable block. The reliability when preventing the tie rod from dropping is better.

Preferably, the lower surface of the cross pull rod is provided with a blind hole, and the upper end of the vertical ejector pin penetrates through the blind hole when the lower clamping plate rises to enable the middle die and the upper die to be closed. The impact head translation spring can only drive the connecting seat to move when releasing energy, and the relative position of the movable block and the vertical ejector rod is kept unchanged. The reliability of driving the impact head to separate from the vertical ejector rod through the impact head translation spring can be improved.

Preferably, a positioning stop block is arranged on the suspension seat, and when the connecting seat and the positioning stop block are abutted together, the impact head is positioned right above the vertical ejector rod; and when the vertical ejector rod rises to lift the impact head until the barb is just hooked on the barb block, the vertical ejector pin is aligned with the blind hole. Whether the connecting seat can be conveniently known whether to move the impact head to align with the vertical ejector rod or not, and the convenience in use is improved.

Preferably, a support block is arranged on one side of the vertical ejector rod facing the center of the middle die, a limiting step is formed between the support block and the side face of the vertical ejector rod, and the upper end face of the vertical ejector rod is an inclined plane with one end facing the support block being low and the other end facing the support block being high; when the vertical sliding rod and the free section of the supporting block are abutted together, the impact head is positioned right above the middle die. The driving barb block can be prevented from extruding the leading-in inclined plane on the barb to cause the impacting head to translate on the vertical ejector rod in the separating process, so that the barb can be reliably hooked on the barb block. The impact head can be prevented from moving away from the middle die and being staggered to cause the middle die not to be impacted when assistance is carried out.

The invention has the following advantages: the middle die can be automatically separated from the upper die in the process of separating the lower clamping plate from the upper clamping plate, and labor is saved when the middle die and the upper die are separated; when the middle die and the upper die are not separated by gravity, the controllable demolding power-assisted mechanism can be started to assist in demolding.

Drawings

Fig. 1 is a schematic view of a vulcanizer with a middle mold stripping spring in a free state and a lift cylinder in a contracted state.

Fig. 2 is a partially enlarged schematic view of a portion a of fig. 1.

Fig. 3 is a partially enlarged schematic view of fig. 2 at B.

Figure 4 is a schematic view of the vulcanizer with the lift cylinder raised just to hook the barbs onto the barb blocks.

Fig. 5 is a partially enlarged schematic view of fig. 4 at C.

FIG. 6 is a schematic view of the vulcanizer with the lift cylinder raised until the middle mold is closed onto the upper mold.

Fig. 7 is a partially enlarged schematic view of fig. 6 at D.

In the figure: the device comprises an upper die 1, a middle die 2, a lower die 3, a machine base 4, a vertical guide upright post 5, a lower clamping plate 6, an upper clamping plate 7, a lifting cylinder 8, a suspension seat 9, an upper die suspension post 10, a middle die suspension post 11, an upper die suspension post part suspension block 12, a middle die suspension post part suspension block 13, a transverse sliding post 14, a connecting seat 15, a striking head 16, a middle die demolding spring 17, a transverse sliding rod 18, a sliding sleeve 19, a barb 20, a release-preventing spring 21, a vertical sliding rod 22, a movable block 23, a vertical sliding rod part release-preventing block 24, a barb block 25, a vertical thread head 26, an upper connecting block 42, a transverse pull rod 27, a striking head translation spring 28, a vertical ejector rod 29, a vertical ejector pin 30, a positioning stopper 31, a lead-in inclined plane 32, a support block 33, a limiting step 34, an upper end surface 35 of the vertical ejector rod, a connecting seat vertical plug pin 36, a concave pit 37, a movable block part vertical.

Detailed Description

The invention is further described with reference to the following figures and examples.

A method for demolding a mold in a vulcanizing machine is completed by, but not limited to, the vulcanizing machine in the embodiment.

Referring to fig. 1, 2 and 3, a vulcanizer comprises an upper die 1, a middle die 2, a lower die 3, a base 4, a plurality of vertical guide posts 5 with lower ends connected to the base, a lower clamping plate 6 sleeved on a sliding post, an upper clamping plate 7 fixedly connected to the upper end of the vertical guide posts, and a lifting cylinder 8 for driving the lower clamping plate to lift. The lower clamping plate is positioned between the machine base and the upper clamping plate. The lifting cylinder is a hydraulic cylinder or an air cylinder. The lifting cylinder is arranged between the machine base and the lower clamping plate. There are 4 vertical guide posts. 4 vertical guide upright posts are arranged on 4 corners of the lower clamping plate in a penetrating way. The left end and the right end of the lower clamping plate are respectively connected with a suspension seat 9. An upper die suspension column 10 and a middle die suspension column 11 are arranged on the suspension seat in a penetrating way. The upper end of the upper die suspension column is connected with an upper die suspension column part suspension block 12, and the lower end of the upper die suspension column is connected with the upper die. The upper die is hung on the hanging seat through the upper die hanging column part hanging block. The upper end of the middle die hanging column is connected with a middle die hanging column part hanging block 13, and the lower end of the middle die hanging column is connected with a middle die. The middle die is hung on the hanging seat through the middle die hanging column part hanging block. The upper die, the middle die and the lower die are sequentially distributed along the up-down direction, and the upper die, the middle die and the lower die are positioned between the upper clamping plate and the lower clamping plate. When the upper die suspension column is suspended on the suspension seat through the upper die suspension column part suspension block and the middle die suspension column is suspended on the suspension seat through the middle die suspension column part suspension block, the upper die and the middle die are separated in the vertical direction and are positioned between the upper clamping plate and the lower clamping plate. A controllable demoulding power-assisted mechanism is arranged between the middle die and the suspension seat.

The controllable demoulding power-assisted mechanism comprises a transverse sliding column 14, a connecting seat 15, an impact head 16, a middle mould demoulding spring 17 positioned between the connecting seat and the impact head, a transverse sliding rod 18 connected to the connecting seat, a sliding sleeve 19 sleeved on the transverse sliding rod, a barb 20 connected to the sliding sleeve, a release-preventing spring 21 driving the sliding sleeve to move towards the connecting seat, a vertical sliding rod 22 arranged on the impact head and a movable block 23 sleeved on the transverse sliding column. One end of the horizontal sliding rod is provided with a stop block 41. The anti-release spring is sleeved on the transverse sliding rod, one end of the anti-release spring is blocked with the blocking block, and the other end of the anti-release spring is abutted with the sliding sleeve. The anti-drop movable block is positioned on one side of the connecting seat far away from the upper clamping plate. The connecting seat is sleeved on the horizontal sliding rod. The transverse sliding column is connected to the suspension block. The upper end of the vertical slide rod penetrates through the suspension seat and is provided with a vertical slide rod part anti-falling block 24 positioned above the suspension seat. The impact head is provided with a barb block 25. The lower end of the connecting base is provided with a vertical screw head 26. The vertical thread head is connected with an upper connecting block 42 through threads. The upper end of the middle die demoulding spring is connected with the upper connecting block, and the lower end of the middle die demoulding spring is connected with the impact head. When the middle die suspension column is suspended on the suspension seat through the middle die suspension column part suspension block and the middle die demolding spring is in a free state, the impact head can press the upper surface of the middle die, specifically the upper surface of the middle die is lower than the middle die, so that the middle die demolding spring is moved to press the upper surface of the middle die and energy is still stored in the middle die demolding spring. The connecting seat can slide to stagger with the middle mold along the horizontal direction. The controllable demoulding power-assisted mechanism further comprises a transverse pull rod 27, an impact head translation spring 28 sleeved on the transverse sliding column, a vertical ejector rod 29 connected to the lower clamping plate, a vertical ejector pin 30 connected to the vertical ejector rod, and a positioning stop block 31 connected to the suspension block. The side of the lower end of the barb facing the barb block is provided with a guide inclined surface 32 which is inclined downwards and guides the barb to be hooked on the barb block. One side of the vertical ejector rod facing the center of the middle die is provided with a support block 33. A limit step 34 is formed between the support block and the side surface of the vertical ejector rod. The upper end surface 35 of the vertical ejector rod is an inclined surface which is low towards one end of the supporting block and high towards the other end. When the vertical sliding rod is abutted with the free section of the supporting block, the impact head is positioned right above the middle die

When the connecting seat is abutted to the positioning stop block, the impact head is positioned right above the vertical ejector rod, namely the vertical ejector rod is aligned to the impact head, and at the moment, the vertical ejector pin is aligned to the transverse pull rod. One end of the cross pull rod is hooked in a concave pit 37 on the upper surface of the connecting seat through a connecting seat part vertical bolt 36, and the other end of the cross pull rod passes through the movable block from top to bottom through a movable block part vertical bolt 38 and is hooked on the upper surface of the movable block. The lower end of the sliding block part vertical bolt is provided with a vertical bolt part anti-falling block 39 positioned below the movable block. The lower surface of the tie rod is provided with a blind hole 40. The impact head translation spring is clamped by the connecting seat and the movable block and is in an energy storage state.

In the using process of the utility model, the adhesive tape is coated with a coating,

referring to fig. 4 and 5, when the lifting cylinder ascends, the vertical ejector rod drives the impact head to ascend, and when the impact head ascends, the impact head extrudes the guide inclined plane to enable the barb to be hooked on the barb block and enable the middle die stripping spring to store energy. When the barb is just hooked on the barb block, the vertical thimble aligns with the blind hole, the impact head, the upper die and the middle die are staggered along the horizontal direction, and the movable block and the connecting seat are fixed together by the cross pull rod.

Referring to fig. 6 and 7, the lifting rod is further extended to insert the vertical ejector pin into the blind hole and eject the plug pin of the connecting block part out of the concave pit, and the cross-pull rod loses the function of connecting the connecting block and the movable block together. The transverse pull rod loses the fixed action on the movable block and the connecting seat, then the impact head translation spring drives the connecting seat to move to the upper part of the middle die, and the impact head moves to the position right above the middle die by staggering the support block on the vertical ejector rod, and at the moment, the support block enables the connecting seat not to translate and stagger the middle die. When the transverse pull rod loses the fixing effect on the movable block and the connecting seat, the middle die and the upper die are still not folded together. The lifting cylinder further extends to drive the middle mold to be folded into the upper mold. When the middle mold is folded into the upper mold, the vertical bolt of the movable block part still penetrates through the movable block, and the impact head is positioned right above the middle mold and is spaced from the middle mold (namely is not contacted with the middle mold). In the die sinking process, if the middle die can not be lifted out of the upper die when the lower die and the lower clamping plate descend to lose the supporting effect on the middle die, the barb and barb block supporting block is manually driven, the middle die demoulding spring drives the impacting head to descend to impact the middle die, and therefore the middle die is separated from the upper die. After the middle die demolding spring releases energy, the connecting seat bolt is inserted into the concave pit again to connect the connecting seat and the movable block together, so that the impact head moves the spring to store energy, and the connecting seat is moved to be abutted against the positioning stop block. When the middle mold demoulding spring does not release energy, the middle mold demoulding spring is positioned above the middle mold.

Claims

1. The utility model provides a mould demoulding method in vulcanizer, vulcanizer includes that frame, lower extreme are connected a plurality of vertical guide post on the frame, the lower grip block of cover on the traveller, rigid coupling are in the last grip block of vertical guide post upper end, the lift jar that the grip block goes up and down under the drive and be located the rubber mold between last grip block and the lower grip block, rubber mold includes mould, well mould and lower mould, the grip block is located between frame and the last grip block down, the lift jar sets up between frame and the lower grip block, its characterized in that hangs well mould and last mould liftable on last grip block, well mould and lower mould are separated along upper and lower direction with the lower mould when all being in the extreme position to rely on gravity to make well mould throw off from the mould.

2. The method for demolding the middle mold of the vulcanizing machine as claimed in claim 1, wherein the left end and the right end of the lower clamping plate are respectively connected with a suspension seat, an upper mold suspension column and a middle mold suspension column are arranged on the suspension seats in a penetrating manner, an upper mold suspension column part suspension block is connected to the upper end of the upper mold suspension column, the lower end of the upper mold suspension column is connected with the upper mold, the upper mold is suspended on the suspension seats through the upper mold suspension column part suspension block to realize lifting connection with the upper clamping plate, a middle mold suspension column part suspension block is connected to the upper end of the middle mold suspension column, the lower end of the middle mold suspension column part suspension block is connected with the middle mold, and the middle mold is suspended on the suspension seats through the middle mold suspension column; when the upper die suspension column is suspended on the suspension seat through the upper die suspension column part suspension block, the upper die is located at the lowest position, and when the middle die suspension column is suspended on the suspension seat through the middle die suspension column part suspension block, the middle die is located at the lowest position.

3. The method for demolding the middle mold in the vulcanizing machine as claimed in claim 2, wherein a controllable demolding power-assisted mechanism is arranged between the middle mold and the suspension seat, the controllable demolding power-assisted mechanism comprises a connecting seat, an impact head, a middle mold demolding spring positioned between the connecting seat and the impact head, a transverse sliding rod connected to the connecting seat, a sliding sleeve sleeved on the transverse sliding rod, a barb connected to the sliding sleeve, a release-stopping spring driving the sliding sleeve to move towards the connecting seat and a vertical sliding rod arranged on the impact head, the upper end of the vertical sliding rod penetrates through the suspension seat and is provided with a release-stopping block at the vertical sliding rod part above the suspension seat, the impact head is provided with a barb block, and the connecting seat is connected to the suspension seat; the barb is hooked on the barb block, and when the middle die is folded together under the action of the lower clamping plate, the middle die demoulding spring is in a compressed energy storage state, the impact head is staggered with the upper die, and the impact head is positioned right above the middle die and spaced from the middle die; when the upper die suspension column is suspended on the suspension seat through the upper die suspension column part suspension block and the barb is separated from the barb block, the middle die stripping spring can drive the impact head to impact the middle die folded on the upper die; when the lower clamping plate descends to the lower die and loses the supporting effect on the middle dies, the middle dies are still positioned in the upper die, the barbs are separated from the barb blocks, and the impact heads move downwards under the effect of the middle die demolding springs to impact the middle dies so as to assist the middle dies to be separated from the upper die.

4. The method for demolding a middle mold in a vulcanizing machine as claimed in claim 3, wherein a vertical thread head is provided at a lower end of the connecting base, the vertical thread head is in threaded connection with an upper connecting block, and an upper end of the middle mold demolding spring is connected with the upper connecting block.

5. The method for releasing a middle mold in a vulcanizer of claim 3, wherein said middle mold hanging pillar is hung on said hanging seat by said middle mold hanging pillar hanging block and said middle mold releasing spring is in a free state, said striker is capable of pressing onto an upper surface of said middle mold.

6. The method for releasing a middle mold in a vulcanizer of claim 3, wherein said suspension block is provided with a cross slide post, and said connecting seat is slidably fitted on said cross slide post, and said connecting seat can be slid to be horizontally offset from said middle mold.

7. The method for demolding a mold in a vulcanizer of claim 3, wherein the suspension block is provided with a cross slide post, the connecting seat is slidably fitted over the cross slide post, the controllable demolding assisting mechanism further comprises a cross pull rod, a movable block fitted over the cross slide post, a striking head translation spring fitted over the cross slide post, a vertical ejector rod connected to the lower clamping plate and abutting against the striking head, and a vertical ejector pin connected to the vertical ejector rod and abutting against the cross pull rod, the movable block is located on a side of the connecting seat away from the upper clamping plate, a guide inclined surface is provided at a side of a lower end of the barb facing the barb block and guides the barb to be hooked onto the barb block, the vertical ejector pin aligns with the cross pull rod when the vertical ejector rod aligns with the striking head, and one end of the cross pull rod is hooked onto an upper surface of the connecting seat through a vertical plug pin, The other end of the energy storage spring is hooked on the upper surface of the movable block through a vertical bolt of the movable block part, and the impact head translation spring is clamped by the connecting seat and the movable block and is in an energy storage state; the vertical ejector rod rises to lift the impact head until the barb is just hooked on the barb block, and the transverse pull rod still connects the movable block with the connecting seat; and the vertical ejector rod continues to rise, so that the vertical ejector pin jacks the transverse pull rod until the transverse pull rod is just separated from at least one of the connecting seat and the movable block, and the middle die and the lower die are still in a separated state.

8. The method for releasing a mold in a vulcanizer of claim 7, wherein said lower holding plate is raised to close the middle mold and the upper mold, and said movable block vertical pin is still inserted into said movable block.

9. The method for demolding the middle mold of the vulcanizing machine as claimed in claim 8, wherein the lower end of the vertical pin of the sliding block portion is provided with a vertical pin portion anti-falling block positioned below the movable block, the lower surface of the cross pull rod is provided with a blind hole, and the upper end of the vertical pin penetrates through the blind hole when the lower clamping plate is lifted to enable the middle mold and the upper mold to be closed.

10. The method for demolding the middle mold of the vulcanizing machine as claimed in claim 9, wherein a positioning stop block is arranged on the suspension seat, and when the connecting seat and the positioning stop block are abutted together, the impact head is positioned right above the vertical ejector rod; and when the vertical ejector rod rises to lift the impact head until the barb is just hooked on the barb block, the vertical ejector pin is aligned with the blind hole.