CN113370473A

CN113370473A - Lockable oil cylinder driving type die closing and demoulding mechanism

Info

Publication number: CN113370473A
Application number: CN202110623753.8A
Authority: CN
Inventors: 肖国华
Original assignee: Zhejiang Business Technology Institute
Current assignee: Zhejiang Business Technology Institute
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-09-10

Abstract

The invention discloses a lockable oil cylinder driving type die closing and demoulding mechanism, and relates to the technical field of mould design and manufacture. The mold comprises an insert, a mold foot, an oil cylinder, a guide rail arranged on the mold foot and a middle slide block erected on the guide rail, wherein the guide rail is provided with a plugging groove; the insert is movably arranged on the middle sliding block and also comprises an inserting groove arranged on the middle sliding block, a pushing block and a transmission push rod, wherein one end of the transmission push rod is connected with the output telescopic shaft of the oil cylinder, and the other end of the transmission push rod is connected with the pushing block; the clamping device is characterized by further comprising a clamping channel arranged on the middle sliding block and a clamping strip inserted into the clamping channel in an inserting mode, one end of the clamping channel is communicated with the inserting groove, the other end of the clamping channel extends to the position of the guide rail and faces the inserting groove, a space is reserved between the pushing block and the bottom of the inserting groove, and the length of the clamping strip is larger than that of the inserting channel. The locking device is simple in structure and stable in locking effect, and is particularly suitable for the molding use requirement of plastic parts with complex structures.

Description

Lockable oil cylinder driving type die closing and demoulding mechanism

Technical Field

The invention relates to the technical field of mold design and manufacture, in particular to a lockable oil cylinder driving type mold closing and demolding mechanism.

Background

When an injection mold of a complex plastic part of an automobile is designed, the parting design of a molding cavity of a plastic part, the structural design of a demolding mechanism in a restrictive design space and the realization of the overall structural function of the mold are 3 keys of the structural design of the mold, and the structural design of the mold is mutually linked with the design of the demolding mechanism and cannot be separated.

Particularly, in the injection mold design of the plastic part of the air outlet of the automobile air conditioner, the air outlet of the automobile air conditioner has complex structural characteristics. For example, the following are present on the plastic part of the air outlet of the automobile air conditioner: the central wall comprises 1 central wall and 8mm round holes, 4 four-sided grooves, 6 reinforcing ribs, 1 rectangular reversed round hole, 7 square curved surface arrangement grooves, 7 long-strip-shaped curved surface arrangement grooves, 1 central wall and 10mm round hole, 1 three-sided groove, 2 rectangular through holes, 2 inner wall clamping grooves, 8 inner wall reinforcing ribs, 1 sharp corner reverse buckle, 1 side groove and 1 rectangular taper inclined hole; the structural characteristics lead to that the injection mould can only adopt a splicing combined mould structure, and the integral mould is required to be divided into a plurality of parts of inserts.

The hot melt plastic is injected into an integral die formed by assembling a plurality of inserts, and the inserts must keep the positions of the inserts not to be deviated in the solidification and forming process of the hot melt plastic so as to ensure that the size of the die is not changed. When the oil cylinder is used as a power source conventionally, the conventional oil cylinder does not have a supporting facility for locking an output shaft of the oil cylinder immovably, and the oil cylinder can work and operate by means of oil pressure in the oil cylinder, so that strong injection pressure can be generated when hot-melt plastic is injected into a mold. Injection pressure will offset the thrust of hydro-cylinder on acting the mold insert, transmitting the hydro-cylinder along the mold insert on, lead to the output shaft reverse backspacing of hydro-cylinder for mould body position can not keep, leads to clearance change between the mould, and the whole grow of mould appears the waste product.

The invention with the patent number of CN201510398345.1 discloses a core-pulling block locking device matched with an oil cylinder, which comprises a guide sleeve, a push pipe, a locking block, a push rod and a pull block. The invention adopts the structure that a guide hole of a guide sleeve is internally provided with a locking groove, a push pipe is provided with a delay hole, a locking block hole and a pipe hole, and a push rod is provided with an unlocking table and a locking table; when the device is applied, the device is matched with an oil cylinder and installed in an injection mold, the oil cylinder drives a push rod to drive a push pipe and a core pulling block to reset the core pulling block leftwards through a pulling block, at the moment, the inner ring end of a locking block is positioned at a locking platform of the push rod, the outer ring end of the locking block extends outwards from a locking block hole of the push pipe and is clamped into a locking groove of a guide sleeve, and the push pipe and the core pulling block are locked; the oil cylinder drives the push rod to move rightwards, the locking block retracts into the locking block hole, the push pipe and the core-pulling block are unlocked, and the core-pulling block is subjected to core-pulling and demolding. The device still adopts a locking mechanism with a separate structure to prevent the push tube from retracting, but the locking mechanism still occupies space, and the whole device does not reach the minimum volume; the operations such as installation and maintenance of the locking mechanism are still relatively cumbersome.

Most importantly: when a plastic product with complex structural characteristics is handled, the working requirement that the moving direction of the insert is inconsistent with the working direction of the oil cylinder often exists, and the push pipe and the core-pulling block in the core-pulling block locking device in the patent are in the same moving direction, so that the situation that the working direction of the insert is inconsistent with the working direction of the oil cylinder is obviously difficult to adapt to.

Disclosure of Invention

The invention provides a lockable oil cylinder driving type die closing and demoulding mechanism, which has a simple and efficient locking structure for locking an output shaft of an oil cylinder, can adapt to the complex structural characteristics of an air outlet plastic part of an automobile air conditioner and the unconventional demoulding direction requirement of the air outlet plastic part, and is used for solving the technical problems.

The technical scheme for solving the problems is as follows: the utility model provides a but locking cylinder drive formula compound die demoulding mechanism, including mold insert, mould foot, hydro-cylinder fixed mounting is on the mould foot, its characterized in that: the mould also comprises a guide rail arranged on the mould foot and a middle slide block erected on the guide rail, wherein the guide rail is provided with a plugging groove; the insert is movably arranged on the middle sliding block and also comprises an inserting groove arranged on the middle sliding block, a pushing block and a transmission push rod, wherein one end of the transmission push rod is connected with the output telescopic shaft of the oil cylinder, and the other end of the transmission push rod is connected with the pushing block; the middle sliding block is provided with a middle sliding block, the middle sliding block is provided with a guide rail, the guide rail is provided with a guide groove, the middle sliding block is provided with a middle sliding block, the guide rail is provided with a guide groove, the guide rail is provided with a guide rail hole, the guide rail hole is provided with a guide groove, the guide groove is provided with a guide groove, and the guide groove is provided with a guide groove; and (3) closing the mold insert, wherein the oil cylinder works to push the transmission push rod and the middle slide block to move relatively, so that the push block is close to the bottom of the insertion groove, the insertion strip is pushed to move towards the direction of the guide track, one end of the insertion strip extends out and is tightly propped in the insertion groove, the middle slide block is locked, and the mold insert is locked.

Furthermore, both ends of the insertion strip are provided with first abutting inclined planes which are close to the end face of the insertion strip; and a second abutting-pushing inclined plane is arranged in the inserting groove and extends to the notch of the inserting groove. The first abutting-against inclined plane at one end of the insertion strip can conveniently push the extrusion insertion strip to move transversely by the pushing block when contacting with the pushing block, so that the other end of the insertion strip is inserted into the insertion groove, and the locking function is realized. In addition, the pushing block moves in a return stroke under the driving of the oil cylinder, the pushing block moves to expose a gap between the pushing block and the inserting groove and drive the middle sliding block to move in the return stroke, at the moment, the second pushing inclined plane on the guide rail is contacted with the first pushing inclined plane at the other end of the inserting strip, by means of the inclined plane angle, when the middle sliding block moves along the guide rail, the inclined plane pushing force extrudes the inserting strip to transversely retreat, the other end of the inserting strip is separated from the inserting groove, and the unlocking function is realized.

Furthermore, the mold further comprises a guide inclined plane arranged on the middle sliding block, a first guide groove arranged on the guide inclined plane, and a first guide boss matched with the insert and arranged on the insert. The insert is arranged on the guide inclined plane of the middle slide block, so that the insert is in an upward inclined orientation. In addition, when the oil cylinder pushes the middle slide block to move horizontally, the insert is made to move on the guide inclined plane relative to the middle slide block, so that the insert moves in an upward oblique direction in a reciprocating manner and is overlapped with the demolding direction of the plastic part.

Furthermore, the mould also comprises a movable mould arranged above the mould foot and an inclined guide cavity which is arranged on the movable mould and is used for accommodating the insert. After the plastic part is molded, the movable die moves downwards to expose the molded plastic part, so that the molded plastic part can be taken out conveniently. In addition, in the die closing process, the inclined guide cavity arranged on the movable die can standardize the moving path of the insert, so that the die closing precision is improved, and the size and the quality of a plastic part are ensured.

Furthermore, the device also comprises a limiting block which is fixedly arranged on the movable die and is positioned at an opening above the oblique guide cavity. The limiting block is used for stopping the excessive movement of the insert in the inclined guide cavity, so that the insert is moved and exceeds the range, and the excessive extrusion force is generated when the inserts are spliced mutually, so that the insert is extruded and deformed.

Further, the device also comprises a plurality of stroke protection switches which are fixedly arranged on the die legs and the contacts of which face the middle slide block, and trigger assemblies which are correspondingly arranged at the side walls of the middle slide block. The stroke protection switch is arranged at the stroke end of the reciprocating movement of the middle slide block and is used for limiting and preventing the middle slide block from moving out of the guide track.

Further, the mold insert comprises a forming portion and a connecting portion, wherein the forming portion and the connecting portion are mutually spliced to form the mold, the connecting portion is used for being connected with the middle sliding block, the connecting portion and the forming portion are integrally arranged, and the first guide boss is obliquely and downwards arranged at the lower end of the forming portion. The forming part is provided with a large number of characteristic structures of plastic parts, and the connecting part is used as an intermediate connecting part to integrally connect the forming part and the first guide boss, so that the insert is prevented from deforming when moving obliquely in the oblique guide cavity.

Further, the wear-resisting plate comprises a plurality of wear-resisting plates mounted on the connecting portions. The wear-resisting plate is used for protecting the mold insert to avoid direct scraping between the side wall of the mold insert and the oblique guide cavity, and the mold insert and the oblique guide cavity are worn in long-term use, so that the precision of the mold is reduced.

Furthermore, the inserting groove and the first guide groove are both provided with T-shaped grooves; the pushing block and the first guide boss are both provided with T-shaped blocks. The pushing block can not fall out of the inserting groove along the moving direction of the middle sliding block while sliding in the inserting groove, so that the oil cylinder can drive the middle sliding block to move through the pushing block; similarly, the first guide table cannot be separated along the direction of the oblique guide cavity in the first guide groove, so that the insert is ensured to move in the oblique guide cavity in a reciprocating mode.

Further, the movable mould further comprises a slide block accommodating groove formed in the movable mould, and the slide block accommodating groove is communicated with the inclined guide cavity. The middle sliding block is arranged between the die foot and the movable die, and the position of the middle sliding block is accommodated through the sliding block accommodating cavity, so that the height of the whole device is reduced.

The invention has the beneficial effects that: according to the lockable oil cylinder driving type die assembly and demolding mechanism, on the premise that the volume of the whole demolding mechanism is not changed, the locking structure is arranged at the connecting position of the oil cylinder and the middle sliding block, so that the middle sliding block is locked when needed, the output shaft of the oil cylinder and the insert are indirectly locked, the position deviation of the insert under external pressure is prevented, the dimension error of a thermoplastic piece is prevented, and the quality of the plastic piece product is improved.

In the device, the middle sliding block is driven by the oil cylinder to horizontally slide, the insert is obliquely arranged on the middle sliding block and can move on the middle sliding block, and meanwhile, the moving direction of the insert is limited by the movable die, so that the moving direction of the insert is overlapped with the demolding direction of part of structural characteristics of the air-conditioner air outlet plastic part, the redirected oil cylinder driving demolding operation is realized, and the flexibility degree is high.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.

Fig. 1 is a schematic diagram of an overall structure of a lockable cylinder-driven mold closing and releasing mechanism according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a mold closing state of a lockable cylinder-driven mold closing and releasing mechanism according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a locking principle of a lockable cylinder-driven mold closing and demolding mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a movable mold of a lockable cylinder-driven mold closing and releasing mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an insert of a lockable cylinder-driven mold closing and demolding mechanism according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram illustrating an operation principle of an intermediate slider of a lockable cylinder-driven mold closing and releasing mechanism according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a lockable cylinder-driven mold closing and demolding mechanism for manufacturing a molded air outlet plastic part of an air conditioner according to an embodiment of the present invention.

1-an insert, 2-a mold foot, 3-an oil cylinder, 4-a guide track, 5-a middle slide block, 6-a clamping groove, 7-a splicing groove, 8-a pushing block, 9-a transmission push rod, 10-a clamping channel, 11-a clamping strip, 12-a first pushing inclined plane, 13-a second pushing inclined plane, 14-a guide inclined plane, 15-a first guide groove, 16-a first guide boss, 17-a movable mold, 18-an inclined guide cavity, 19-a limiting block, 20-a stroke protection switch, 21-a trigger assembly, 22-a forming part, 23-a connecting part, 24-a wear-resisting plate and 25-a slide block accommodating groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1 to 7, a lockable oil cylinder driven mold closing and demolding mechanism according to an embodiment of the present invention includes an insert 1, a mold leg 2, and an oil cylinder 3, wherein the oil cylinder 3 is fixedly mounted on the mold leg 2. The method specifically comprises the following steps: two mould feet 2 fixed mounting are on the bottom plate, and hydro-cylinder 3 fixed mounting is between two mould feet 2, and the output telescopic shaft of hydro-cylinder 3 is towards the bottom plate outside, and middle slider 5 overlaps and installs in the top of hydro-cylinder 3, is fixed with a guide rail 4 on two mould feet 2 respectively, and 5 both sides of middle slider are provided with the sliding block respectively in order to erect on guide rail 4.

In this embodiment, the transmission push rod 9 for transmitting the working power of the oil cylinder 3 is provided with a C-shaped rod body, and the lower end of the transmission push rod 9 is fixedly connected with the output telescopic shaft of the oil cylinder 3; the upper end of the transmission push rod 9 is connected with the middle slide block 5. Meanwhile, an inserting groove 7 with a T-shaped section structure is vertically formed in the side wall, corresponding to the transmission push rod 9, of the middle sliding block 5, a pushing block 8 which is also T-shaped is installed in the inserting groove 7, and the pushing block 8 is fixedly connected with the upper end of the transmission push rod 9. When the oil cylinder 3 works to control the extension or the shortening of the output telescopic shaft, the transmission push rod 9 fixedly connected with the output telescopic shaft of the oil cylinder 3 drives the middle part to slide on the guide rail 4 to move in a reciprocating mode.

The intermediate slide 5 is further provided with a guide slope 14, the guide slope 14 is provided with a first guide groove 15, the insert 1 is integrally provided with a first guide boss 16, the first guide boss 16 is provided with a "T" shaped body, the cross section of the first guide groove 15 is also in a "T" shape, and the first guide boss 16 is attached to the first guide groove 15 and is also slidable in the first guide groove 15.

In the present embodiment, the guide slope 14 and the insertion groove 7 are respectively provided at both ends of the intermediate slider 5, and are both ends in the moving direction of the intermediate slider 5. The insert 1 is movably arranged on the middle slide block 5 by means of a first guide boss 16, and the whole insert 1 is in an inclined upward position posture; the insert 1 is also inserted into an inclined guide chamber 18 opened in a movable mold 17, and the movable mold 17 is mounted above the mold leg 2. The oil cylinder 3 works to drive the middle slide block 5 to move in the horizontal direction, and the insert 1 can make linear motion in the oblique upward direction by virtue of the oblique guide cavity 18 and the guide inclined plane, so that the mechanical action of die assembly and demolding is realized.

Taking fig. 2 as an example, in this embodiment, the oil cylinder 3 operates, the output telescopic shaft retracts, the transmission push rod 9 drives the middle slider 5 to move leftward on the guide track 4, when the middle slider 5 moves to the end of the left end stroke of the guide track 4, the insert 1 moves leftward along with the middle slider 5, and relative to the middle slider 5, the insert 1 also moves relatively on the guide slope, the relative movement speed of the insert 1 is limited by the oblique guide cavity 18, and finally the insert 1 is controlled to extend obliquely upward and leftward in the oblique guide cavity 18 and finally butt with other inserts 1.

As a key locking structure in this embodiment, the middle slider 5 is further provided with two plugging channels 10, the plugging channels 10 are respectively located at two sides of the plugging groove 7, and one end of each plugging channel leads to the side wall of the plugging groove 7, and the other end leads to the guide rail 4; and a plugging strip 11 is inserted in the plugging channel 10, and the length of the plugging strip 11 is greater than that of the plugging channel 10 so as to ensure that at least one end of the plugging strip 11 extends out of the plugging channel 10. In addition, a pushing block 8 is arranged in the insertion groove 7, and the height of the pushing block 8 is smaller than that of the insertion groove 7, so that a gap is reserved between the bottom surface of the pushing block 8 and the bottom surface of the insertion groove 7. When the oil cylinder 3 works to enable the output telescopic shaft to retract, the pushing block 8 is pressed through the transmission push rod 9, the pushing block 8 is enabled to abut against the bottom of the inserting groove 7, the inserting strip 11 in the inserting channel 10 is forced to extend out of the guide rail 4 and abut against the side wall of the guide rail 4 in the process that the pushing block 8 moves to the bottom of the inserting groove 7, and therefore the middle sliding block 5 is locked, and the insert 1 is prevented from retracting.

As one of the preferred items of this embodiment, in order to facilitate the tight contact of the tightening strip 11 on the guide rail 4, a tightening groove 6 is formed at the side wall of the guide rail 4, and the tightening groove 6 is disposed at the end of the left end stroke of the middle slider 5 and is in butt joint with the tightening channel 10. In addition, the two ends of the insertion strip 11 are respectively provided with a first abutting-pushing inclined surface 12, so that the edge part of the pushing block 8 can push the insertion strip 11 through the first abutting-pushing inclined surfaces 12, and one end of the insertion strip 11 extends out of the insertion groove 6. Meanwhile, the second abutting-pushing inclined surface 13 extending to the notch of the inserting groove 6 is arranged in the inserting groove 6, the middle sliding block 5 can move rightwards conveniently, when the insert 1 is driven to demould, the second abutting-pushing inclined surface 13 is in contact with the first abutting-pushing inclined surface 12, the inserting strip 11 can be pressed conveniently to retreat into the inserting groove 10, and one end of the second abutting-pushing inclined surface extends into the inserting groove 7.

As a second preferred item of the present embodiment, the insert 1 mainly includes two parts, namely, a molding part 22 and a connecting part 23, wherein the molding part 22 is provided with a mold feature corresponding to a structural feature of a part of the plastic part, the connecting part 23 serves as an intermediate connecting body to connect the molding part 22 and the first guiding boss 16, and the cross-sectional shape and size of the connecting part 23 are closer to those of the inclined guiding cavity 18, so as to facilitate the movement of the insert 1 in the inclined guiding cavity 18 and improve the accuracy of the mold clamping butt joint dimension of the insert 1.

Wear plates 24 are further fixedly embedded in the connecting portions 23, the four wear plates 24 are fixedly mounted on four side walls of the connecting portions 23 respectively, and the wear plates 24 slightly exceed the side wall surfaces of the connecting portions 23, so that when the connecting portions 23 move in the inclined guide cavity 18, the connecting portions 23 are separated from the inclined guide cavity 18 by the wear plates 24, and abrasion of the insert 1 caused by long-term scraping contact of the inner walls of the inclined guide cavity 18 of the insert 1 is avoided.

As a third preferred embodiment, the bottom of the movable mold 17 is provided with the slide block accommodating groove 25, so that the movable mold 17 can be attached to the mold leg 2, the movement of the intermediate slide block 5 is not affected by the arrangement of the movable mold 17, and the height of the whole demolding mechanism is greatly reduced.

Referring to fig. 4, in the present embodiment, the slide receiving groove 25 receives the upper half portion of the intermediate slide 5 and the guide rail 4, and the slide receiving groove 25 is communicated with the bottom of the inclined guide cavity 18, so that the insert 1 is loaded into the inclined guide cavity 18 from the bottom of the slide receiving groove 25 while the intermediate slide 5 is placed in the slide receiving groove 25. In addition, a stroke protection switch 20 is provided on the die leg 2 at a fixed distance, and the stroke protection switch 20 is provided at a lower position on the guide rail 4 side, a contact of the stroke protection switch 20 faces the intermediate slider 5, and a trigger assembly 21 is provided at a corresponding side wall position of the intermediate slider 5. When the intermediate slide 5 moves on the guide track 4, the trigger assembly 21 is once contacted with the stroke protection switch 20, and an electric signal is generated to reversely control the operation of the oil cylinder 3. Namely: the stroke distance of the reciprocating movement of the middle slide block 5 is limited and defined by means of the stroke protection switch 20, the traditional mode that the traditional oil cylinder 3 outputs the stroke, namely the moving stroke of the middle slide block 5 is replaced, the moving distance of the middle slide block 5 is controlled more accurately, and the accuracy of die assembly is enhanced.

In addition, the problem of extrusion deformation due to the fact that the horizontal movement of the intermediate slide 5 is not matched with the oblique movement of the insert 1 on the guide slope 14 can be prevented.

Supplementing a point, a limiting block 19 is arranged at the upper end cavity opening of the inclined guide cavity 18, the limiting block 19 is fixedly installed on the movable mold 17, part of the body of the limiting block 19 extends to the upper cavity opening of the inclined guide cavity 18, and a limiting blocking edge is arranged at the bottom end of the mold insert 1, so that the limiting block 19 can limit the upward extending height of the mold insert 1 in an inclined manner, and mutual extrusion during mutual splicing of the mold inserts 1 is avoided.

Where not mentioned above, all are applicable to the prior art.

Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a lockable oil cylinder drive formula compound die demoulding mechanism, includes mold insert (1), mould foot (2), hydro-cylinder (3) fixed mounting on mould foot (2), its characterized in that: the die also comprises a guide track (4) arranged on the die foot (2) and a middle slide block (5) erected on the guide track (4), wherein the guide track (4) is provided with an inserting groove (6); the insert (1) is movably arranged on the middle sliding block (5), and also comprises an inserting groove (7) arranged on the middle sliding block (5), a pushing block (8) and a transmission push rod (9) with one end connected with an output telescopic shaft of the oil cylinder (3) and the other end connected with the pushing block (8) are also arranged in the inserting groove (7); the device is characterized by further comprising a plugging channel (10) arranged on the middle sliding block (5) and a plugging strip (11) inserted in the plugging channel (10), wherein one end of the plugging channel (10) is communicated with the plugging groove (7), the other end of the plugging channel extends to the guide rail (4) and faces the plugging groove (6), a space is reserved between the pushing block (8) and the bottom of the plugging groove (7), and the length of the plugging strip (11) is greater than that of the plugging channel; mold insert (1) closing, oil cylinder (3) work promotes transmission push rod (9) and middle slider (5) and takes place relative movement for promote piece (8) and draw close to the tank bottom in grafting recess (7), and then support and push away and insert tight strip (11) and move to guide rail (4) direction, make and insert tight strip (11) one end stretch out and support tightly inserting in tight recess (6), slider (5) in the middle of the locking, and then locking mold insert (1).

2. A lockable cylinder-driven mold closing and releasing mechanism as claimed in claim 1, characterized in that: two ends of the insertion strip (11) are respectively provided with a first abutting inclined plane (12) which is close to the end surface of the insertion strip (11); a second abutting and pushing inclined plane (13) is arranged in the inserting groove (6), and the second abutting and pushing inclined plane (13) extends to the notch of the inserting groove (7).

3. A lockable cylinder-driven mold closing and releasing mechanism as claimed in claim 1, characterized in that: the mold insert is characterized by further comprising a guide inclined plane (14) arranged on the middle sliding block (5), a first guide groove (15) formed in the guide inclined plane (14), and a first guide boss (16) matched with the mold insert (1) is arranged on the mold insert.

4. A lockable cylinder-driven mold closing and releasing mechanism as claimed in claim 1, characterized in that: the mold comprises a mold base (2), a movable mold (17) arranged above the mold base (2), and an inclined guide cavity (18) arranged on the movable mold (17) and used for accommodating the insert (1).

5. The lockable cylinder-driven mold closing and demolding mechanism according to claim 4, wherein: the device also comprises a limiting block (19) which is fixedly arranged on the movable die (17) and is positioned at an opening above the oblique guide cavity (18).

6. A lockable cylinder-driven mold closing and releasing mechanism as claimed in claim 1, characterized in that: the device also comprises a plurality of stroke protection switches (20) which are fixedly arranged on the mould feet (2) and the contacts of which face the middle sliding block (5), and trigger components (21) which are correspondingly arranged on the side wall of the middle sliding block (5).

7. A lockable cylinder-driven mold closing and releasing mechanism as claimed in claim 3, characterized in that: the insert (1) comprises a forming part (22) and a connecting part (23), wherein the forming part (22) and the connecting part (23) are mutually spliced to form a die, the connecting part (23) and the forming part (22) are arranged into a whole, and the first guide boss (16) is obliquely and downwards arranged at the lower end of the forming part (22).

8. A lockable cylinder-driven mold closing and releasing mechanism as claimed in claim 7, characterized in that: and a plurality of wear plates (24) mounted on the coupling portions (23).

9. A lockable cylinder-driven mold closing and releasing mechanism as claimed in claim 3, characterized in that: the inserting groove (7) and the first guide groove (15) are both arranged in a T-shaped groove; the pushing block (8) and the first guide boss (16) are both provided with T-shaped blocks.

10. The lockable cylinder-driven mold closing and demolding mechanism according to claim 4, wherein: the device is characterized by further comprising a sliding block accommodating groove (25) formed in the movable die (17), and the sliding block accommodating groove (25) is further communicated with the oblique guide cavity (18).