CN111483119A

CN111483119A - Slide block anti-retreating mechanism

Info

Publication number: CN111483119A
Application number: CN202010422762.6A
Authority: CN
Inventors: 黄园林
Original assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Current assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2020-08-04

Abstract

The invention discloses a slide block anti-back mechanism, which comprises: one end of the core-pulling slide block is provided with a mold core for molding a product, and the other end of the core-pulling slide block extends back to the direction of the molded product; the shovel base is movable between a first state and a second state, one end of the core-pulling sliding block extends into the forming cavity when the shovel base is in the first state, and one end of the core-pulling sliding block is separated from a formed product when the shovel base is in the second state; the shovel base is fixed relative to the core-pulling sliding block when the locking assembly is in a locking state, and the shovel base is movable relative to the core-pulling sliding block when the locking assembly is in an unlocking state; and the driving piece is connected with the shovel base and the locking assembly to drive the shovel base and the locking assembly to move, and drives the shovel base to move from the first state to the second state after driving the locking assembly to move from the locking state to the unlocking state. The slide block retreating prevention mechanism can prevent the core-pulling slide block from retreating during forming to influence the quality of a formed product, and has the advantages of compact structure, stable operation, safety, reliability and the like.

Description

Slide block anti-retreating mechanism

Technical Field

The invention belongs to the technical field of injection mold design, and particularly relates to a slide block anti-back mechanism.

Background

In the design process of the injection mold, when a molded product has an inverted structure, normal demolding cannot be realized, and a sliding block or an inclined top structure is usually required to be added. As shown in fig. 1 and 2, due to the requirement of an installation structure, a part is demoulded only by using a core-pulling sliding block. In the injection molding process, the problem that the core-pulling sliding block usually retreats under the action of molding pressure is caused, so that the molded product is provided with flash and glue, and the assembly and the appearance of the molded product are influenced. At this time, the problem of quality of molded products caused by retreating of the core-pulling sliding block can be solved while core pulling is finished on the premise of not changing the state of the products.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

In view of this, the invention provides a slide block retreating prevention mechanism, which can prevent the quality of a formed product from being influenced by retreating of a core pulling slide block during forming and has the advantages of compact structure, stable operation, safety, reliability and the like.

According to the embodiment of the invention, the slide block anti-back mechanism comprises: the core pulling device comprises a core pulling sliding block, a mold core used for molding a product is arranged at one end of the core pulling sliding block, and the other end of the core pulling sliding block extends back to the direction of the molded product; the shovel base is connected with the other end of the core-pulling sliding block, the shovel base can move between a first state and a second state, when the shovel base is located at the first state, one end of the core-pulling sliding block extends into the forming cavity, and when the shovel base is located at the second state, one end of the core-pulling sliding block is separated from the formed product; the locking assembly is movably connected with the shovel base between a locking state and an unlocking state, the shovel base is fixed relative to the core-pulling sliding block when the locking assembly is in the locking state, and the shovel base is movable relative to the core-pulling sliding block when the locking assembly is in the unlocking state; the driving piece is connected with the shovel base and the locking assembly to drive the shovel base and the locking assembly to move, and the driving piece drives the shovel base to move from the first state to the second state after driving the locking assembly to move from the locking state to the unlocking state.

According to the slide block anti-back mechanism provided by the embodiment of the invention, the structure that the core pulling slide block, the shovel base, the locking assembly and the driving piece are combined is adopted, the core pulling slide block is connected with the shovel base, the shovel base and the locking assembly are connected with the driving piece, the driving piece can drive the shovel base and the locking assembly to move, and can drive the locking assembly to move between the locking state and the unlocking state, so that the movement of the core pulling slide block can be controlled, the core pulling can be finished, the quality problem of a formed product caused by the back of the core pulling slide block can be solved, and the slide block anti-back mechanism is.

The oblique guide pillar drives the slider body and moves along the Y direction, and the second glide plane ends with first glide plane and supports, pushes up to one side for oblique footstock in order to release the back-off shaping piece from the shaping product along the X direction activity, can accomplish the drawing of patterns of first stage, and the slider body can continue the activity downwards, and first glide plane separates with the second glide plane, and slider body, top and oblique footstock move along the Y direction, can accomplish the drawing of patterns of shaping product second stage. This back-off demoulding structure is divided into two stages through the motion with 3 mutually perpendicular directions and is accomplished, can accomplish multi-direction back-off, has simple structure compactness, and the operation is stable, advantages such as safe and reliable.

The slide block anti-back mechanism according to the embodiment of the invention can also have the following additional technical characteristics:

according to an embodiment of the present invention, a mounting hole with an open end is formed in a side of the shovel base adjacent to the driving member, a movable hole inclined with respect to the mounting hole is formed in the shovel base, one end of the movable hole is communicated with the mounting hole, the other end of the movable hole is open, at least a portion of the driving member extends into the mounting hole, and the locking assembly includes: one side of the limiting plate, which is adjacent to the shovel base, is provided with a limiting hole extending along the thickness direction of the limiting plate; the locking piece, at least partly movably of locking piece is located the activity hole, at least another part of locking piece with the driving piece links to each other the locking subassembly is located during the locking state, the driving piece drive the locking piece orientation spacing hole place direction activity, the one end of locking piece is passed the activity hole stretches into spacing hole the locking subassembly is located during the unlocking state, the one end of locking piece with spacing hole breaks away from, the other end of locking piece stretches into the mounting hole.

According to an embodiment of the present invention, the other end of the locking member is provided with a first slope, and the driving member includes: an oil cylinder; the driving block is located in the mounting hole, one end of the driving block is connected with the rod head of the oil cylinder, and the other end of the driving block is provided with a second inclined surface in sliding connection with the first inclined surface.

According to one embodiment of the invention, the number of the movable holes is multiple, the movable holes are distributed at intervals, and the number of the locking pieces corresponds to the number of the movable holes.

According to one embodiment of the present invention, the driving block is formed as a cylindrical member, and an annular protrusion is provided on an outer circumferential surface of the other end of the driving block, and the second inclined surface is provided on the annular protrusion.

According to one embodiment of the invention, the mounting hole is perpendicular to the moving hole.

According to one embodiment of the present invention, the mounting hole is formed in a T-shape in cooperation with the moving hole.

According to an embodiment of the present invention, a mounting through hole is provided at a side of the shovel base adjacent to the direction of the limit plate, the mounting through hole communicating with the mounting hole, and the locking member includes: the insert is arranged in the mounting through hole and is provided with a mounting channel coaxial with the mounting through hole, and the outer peripheral surface of the insert is provided with a limiting hole communicated with the mounting channel; the movable piece is arranged in the installation channel, one end of the movable piece is movably connected with the driving piece, and the other end of the movable piece can extend into the limiting hole or be separated from the limiting hole; one end of the limiting piece is connected with the periphery of the movable piece, and the other end of the limiting piece is inserted into the limiting hole; the elastic piece is arranged in the installation channel and located between the insert and the limiting piece, and when the locking assembly is located in a locking state, the elastic piece is located in a compression state.

According to an embodiment of the present invention, the slider retreat preventing mechanism further includes: the guide sleeve is arranged on the periphery of the core-pulling sliding block in a surrounding mode.

According to one embodiment of the invention, a third inclined surface is arranged at the other end of the core-pulling sliding block, and a fourth inclined surface in sliding fit with the third inclined surface is arranged on one side of the shovel base in the direction close to the core-pulling sliding block.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a molded product according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a front view of a slider anti-backup mechanism according to one embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a core back slider according to an embodiment of the invention;

FIG. 5 is a perspective view of a scoop base according to one embodiment of the present disclosure;

FIG. 6 is a perspective view of a locking element according to one embodiment of the present invention;

FIG. 7 is an exploded view of a slider anti-backup mechanism according to one embodiment of the present invention;

fig. 8 is a schematic structural view of a limiting plate according to an embodiment of the invention;

FIG. 9 is a schematic structural diagram of a drive block according to one embodiment of the present invention;

FIG. 10 is an assembled elevational view of the blade base and drive member in a closed position in accordance with one embodiment of the present invention;

FIG. 11 is a schematic diagram of the shovel base in a second state before opening the mold according to one embodiment of the invention;

fig. 12 is a schematic view of the assembly of the insert, spring and lock after unlocking according to one embodiment of the present invention.

Reference numerals:

a slider back-off prevention mechanism 100;

a core-pulling slider 10; a third slope 11;

a shovel base 20; a mounting hole 21; a movable hole 22; a mounting through-hole 23; a fourth slope 24;

a locking assembly 30; a limit plate 31; a locking member 32; a stopper hole 33; a first inclined surface 34; an insert 35; an elastic member 38;

a drive member 40; an oil cylinder 41; a drive block 42; a second slope 43;

a guide sleeve 50;

the product 200 is formed.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

First, the slider retreat preventing mechanism 100 according to the embodiment of the present invention will be described in detail with reference to the drawings.

As shown in fig. 3 to 12, the slider retreat preventing mechanism 100 according to the embodiment of the present invention includes a core slider 10, a blade base 20, a locking assembly 30, and a driving member 40.

Specifically, a mold core for molding the product 200 is disposed at one end of the core-pulling slider 10, the other end of the core-pulling slider 10 extends away from the molded product 200, the shovel base 20 is connected to the other end of the core-pulling slider 10, the shovel base 20 is movable between a first state and a second state, when the shovel base 20 is in the first state, one end of the core-pulling slider 10 extends into the molding cavity, when the shovel base 20 is in the second state, one end of the core-pulling slider 10 is separated from the molded product 200, the locking assembly 30 is movably connected to the shovel base 20 between the locking state and the unlocking state, when the locking assembly 30 is in the locking state, the shovel base 20 is fixed relative to the core-pulling slider 10, when the locking assembly 30 is in the unlocking state, the shovel base 20 is movable relative to the core-pulling slider 10, the driving member 40 is connected to the shovel base 20 and the locking assembly 30 to drive the shovel base 20 and the locking assembly 30 to move, and after the driving member 40 drives the locking assembly, driving blade base 20 from the first configuration to the second configuration.

In other words, as shown in fig. 3 and 7, the slider anti-back mechanism 100 according to the embodiment of the present invention mainly includes a core-pulling slider 10, a shovel base 20, a locking assembly 30, and a driving member 40, wherein one end of the core-pulling slider 10 is provided with a mold core for molding a product 200, the other end of the core-pulling slider 10 extends in a direction away from the molded product 200, and the shovel base 20 may be connected to the other end of the core-pulling slider 10.

The shovel base 20 can move between a first state and a second state, and when the shovel base 20 is located at the first state, one end of the core-pulling slider 10 can extend into the molding cavity. When the shovel base 20 is located in the second state, one end of the core-pulling slider 10 may be separated from the molded product 200, the locking assembly 30 may move between the locking state and the unlocking state and may be movably connected to the shovel base 20, and when the locking assembly 30 is located in the locking state, the shovel base 20 is fixed with respect to the core-pulling slider 10, that is, the shovel base 20 is not movable with respect to the core-pulling slider 10. When the locking assembly 30 is in the unlocking state, the shovel base 20 is movable relative to the core-pulling slider 10, the driving member 40 is connected with the shovel base 20 and the locking assembly 30, the driving member 40 can drive the shovel base 20 and the locking assembly 30 to move from the locking state to the unlocking state, when the locking assembly 30 is in the locking state, the shovel base 20 is in the first state, and when the locking assembly 30 is in the unlocking state, the shovel base 20 is in the second state.

Therefore, according to the slider anti-back mechanism 100 of the embodiment of the invention, the structure that the core-pulling slider 10, the shovel base 20, the locking assembly 30 and the driving member 40 are combined is adopted, the core-pulling slider 10 is connected with the shovel base 20, the shovel base 20 and the locking assembly 30 are connected with the driving member 40, the driving member 40 can drive the shovel base 20 and the locking assembly 30 to move, and can drive the locking assembly 30 to move between the locking state and the unlocking state, so that the movement of the core-pulling slider 10 can be controlled, core pulling can be completed, the quality problem of a molded product 200 generated by back-moving of the core-pulling slider 10 can be solved, and the slider anti-back mechanism 100 has the advantages of compact structure, stable operation, safety, reliability.

According to an embodiment of the present invention, a mounting hole 21 with an open end is formed on a side of the shovel base 20 adjacent to the driving member 40 to facilitate mounting of the driving member 40, a moving hole 22 is formed in the shovel base 20 and is inclined to the mounting hole 21, one end of the moving hole 22 can communicate with the mounting hole 21, the other end of the moving hole 22 can be open, and at least a portion of the driving member 40 can extend into the mounting hole 21 to facilitate the driving member 40 to drive the shovel base 20 to move. Locking assembly 30 may include a limiting plate 31 and a locking member 32, wherein a side of limiting plate 31 adjacent to blade base 20 is provided with a limiting hole 33 extending along a thickness direction thereof, and at least a portion of locking member 32 is movably disposed in movable hole 22 to facilitate movement of locking member 32 between a locking state and an unlocking state.

Further, at least another part of the locking member 32 is connected to the driving member 40, when the locking assembly 30 is in the locking state, the driving member 40 can drive the locking member 32 to move toward the limiting hole 33, and one end of the locking member 32 can extend into the limiting hole 33 through the moving hole 22, and the locking member 32 is in the locking state, so as to prevent the core back slide 10 from being withdrawn from the molding cavity. When the locking assembly 30 is in the unlocking state, one end of the locking member 32 is separated from the limiting hole 33, and the other end of the locking member 32 extends into the mounting hole 21, so that the shovel base 20 can return to the second state conveniently, the shovel base 20 can move relative to the core-pulling slider 10, and the core-pulling slider 10 can exit from the molding cavity conveniently.

According to an embodiment of the present invention, as shown in fig. 6, the other end of the locking member 32 may be provided with a first inclined surface 34, the inclination angle of the first inclined surface may be generally 45 ° to 60 °, the driving member 40 may include a cylinder 41 and a driving block 42, the driving block 42 is located in the mounting hole 21, one end of the driving block 42 is connected to the rod head of the cylinder 41, the other end of the driving block 42 is provided with a second inclined surface 43 slidably connected to the first inclined surface 34, and the second inclined surface 43 may slide along the first inclined surface 34, so that the locking member 32 may be pushed into the position-limiting hole 33 to lock the locking member 32, and the locking mode is simple in structure and stable in operation.

Alternatively, the number of the movable holes 22 may be multiple, the plurality of movable holes 22 may be distributed at intervals, and the number of the locking members 32 corresponds to the number of the movable holes 22, so that the shovel base 20 can be conveniently locked at different heights, and the shovel base can be adapted to the use of the molded products 200 with different sizes, and has the characteristics of wide application, convenience in use and the like.

Alternatively, as shown in fig. 9, the driving block 42 may be formed as a cylindrical member, an annular protrusion is provided on the outer circumferential surface of the other end of the driving block 42, and a second inclined surface 43 is provided on the annular protrusion, so that the contact area between the second inclined surface 43 and the first inclined surface 34 can be reduced, and the friction between the second inclined surface 43 and the first inclined surface 34 can be reduced, thereby facilitating the stability of the operation of the slide anti-backing mechanism 100 during locking and unlocking.

Preferably, the mounting hole 21 is perpendicular to the movable hole 22, so as to facilitate locking and automatic unlocking of the locking member 32.

In some embodiments of the present invention, the mounting hole 21 and the movable hole 22 are formed in a T shape to facilitate the driving member 40 to drive the locking member 32 to move, thereby facilitating the locking and automatic unlocking of the locking member 32.

According to an embodiment of the present invention, a mounting through hole 23 is formed at one side of the shovel base 20 adjacent to the direction of the limiting plate 31, the mounting through hole 23 may communicate with the mounting hole 21, the locking member 32 includes an insert 35, a movable member, a limiting member and an elastic member 38, the insert 35 may be disposed in the mounting through hole 23 and provided with a mounting channel coaxial therewith, a limiting hole 33 communicated with the mounting channel is disposed on an outer circumferential surface of the insert 35, the movable member may be disposed in the mounting channel, one end of the movable member may be movably connected to the driving member 40, the other end of the movable member may be inserted into the limiting hole 33 or separated from the limiting hole 33, one end of the limiting member is connected to an outer circumference of the movable member, the other end of the limiting member is inserted into the limiting hole 33, the elastic member 38 may be disposed in the mounting channel and located between the insert 35 and the limiting member.

That is, as shown in fig. 10 to 12, the driving element 40 can drive the movable element to move, the elastic element 38 is in a natural state, when the movable element moves to the limiting hole 33, one end of the driving element 40 can slide along one end of the movable element, and can push the limiting element into the limiting hole 33 and lock, when the elastic element 38 is in a compressed state, so that when the elastic element 38 returns to the natural state, the limiting element is separated from the limiting hole 33, thereby automatically unlocking.

Optionally, the slider anti-retraction mechanism 100 further includes a guide sleeve 50, the guide sleeve 50 is disposed around the periphery of the core-pulling slider 10, the core-pulling slider 10 can be disposed at a fixed mold end of the molding device, and a contact area between the core-pulling slider 10 and a fixed mold cavity can be reduced, so that a friction force between the core-pulling slider 10 and the fixed mold cavity can be reduced, the core-pulling slider 10 is convenient to operate when being withdrawn, and the quality of the molded product 200 can be improved.

According to an embodiment of the present invention, as shown in fig. 4 and 5, the other end of the core back slider 10 is provided with a third inclined surface 11, the inclined angle of the third inclined surface 11 may be 15 ° to 25 °, and a fourth inclined surface 24 in sliding fit with the third inclined surface 11 is provided on one side of the shovel base 20 adjacent to the direction of the core back slider 10, so that the assembly of the core back slider 10 and the shovel base 20 is facilitated, the movement of the core back slider 10 along the fourth inclined surface 24 is facilitated, and the stability of the operation of the slider anti-back mechanism 100 is improved.

The assembly process and assembly features according to embodiments of the invention are described in detail below.

The slide block anti-back mechanism 100 according to the embodiment of the present invention includes a movable mold and a fixed mold, the movable mold and the fixed mold are closed first, the driving member 40 is fixed on the plunger of the oil cylinder 41, the plunger pushes the driving member 40 to move upward under the action of oil pressure, so that the driving member 40 pushes the shovel base 20 to move upward, at this time, the elastic member 38 is in a natural state, the second inclined surface 43 of the driving member 40 can slide along the first inclined surface 34, and can push the limiting member into the limiting hole 33 and lock, at this time, the elastic member 38 is in a compressed state, and at this time, the core-pulling slide block 10 is in a self-locking.

Further, after the injection molding is completed, the driving member 40 moves downward under the action of oil pressure, after the driving member 40 moves downward for a certain distance, the driving member 40 is separated from the locking member 32, at this time, the elastic member 38 starts to recover to a natural state, the locking member 32 moves towards the direction away from the limiting hole 33 and is separated from the limiting hole 33 under the action of the spring 208, the driving member 40 continues to move downward, the shovel base 20 is driven to move downward, the shovel base 20 drives the core-pulling slider 10 to move backward while moving downward, and the back-off is completed.

In summary, according to the slide block anti-back mechanism 100 and the slide block anti-back mechanism 100 of the embodiment of the present invention, the structure of combining the core pulling slide block 10, the shovel base 20, the locking assembly 30 and the driving member 40 is adopted, the core pulling slide block 10 is connected with the shovel base 20, the shovel base 20 and the locking assembly 30 are connected with the driving member 40, the driving member 40 can drive the shovel base 20 and the locking assembly 30 to move, and can drive the locking assembly 30 to move between the locking state and the unlocking state, so that the movement of the core pulling slide block 10 can be controlled, not only can core pulling be completed, but also the quality problem of the molded product 200 generated by back-moving of the core pulling slide block 10 can be solved, and the slide block anti-back mechanism 100 has the advantages of compact.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a slider moves back prevention mechanism which characterized in that includes:

the core pulling device comprises a core pulling sliding block, a mold core used for molding a product is arranged at one end of the core pulling sliding block, and the other end of the core pulling sliding block extends back to the direction of the molded product;

the shovel base is connected with the other end of the core-pulling sliding block, the shovel base can move between a first state and a second state, when the shovel base is located at the first state, one end of the core-pulling sliding block extends into the forming cavity, and when the shovel base is located at the second state, one end of the core-pulling sliding block is separated from the formed product;

the locking assembly is movably connected with the shovel base between a locking state and an unlocking state, the shovel base is fixed relative to the core-pulling sliding block when the locking assembly is in the locking state, and the shovel base is movable relative to the core-pulling sliding block when the locking assembly is in the unlocking state;

the driving piece is connected with the shovel base and the locking assembly to drive the shovel base and the locking assembly to move, and the driving piece drives the shovel base to move from the first state to the second state after driving the locking assembly to move from the locking state to the unlocking state.

2. The slide block retraction prevention mechanism according to claim 1, wherein a mounting hole having an open end is formed at a side of the blade base adjacent to the driving member, a movable hole is formed at the blade base to be inclined with respect to the mounting hole, one end of the movable hole communicates with the mounting hole, the other end of the movable hole is open, at least a portion of the driving member protrudes into the mounting hole, and the locking assembly comprises:

one side of the limiting plate, which is adjacent to the shovel base, is provided with a limiting hole extending along the thickness direction of the limiting plate;

the locking piece, at least partly movably of locking piece is located the activity hole, at least another part of locking piece with the driving piece links to each other the locking subassembly is located during the locking state, the driving piece drive the locking piece orientation spacing hole place direction activity, the one end of locking piece is passed the activity hole stretches into spacing hole the locking subassembly is located during the unlocking state, the one end of locking piece with spacing hole breaks away from, the other end of locking piece stretches into the mounting hole.

3. The slide back prevention mechanism of claim 2, wherein the other end of the locking member is provided with a first slope, and the driving member comprises:

an oil cylinder;

the driving block is located in the mounting hole, one end of the driving block is connected with the rod head of the oil cylinder, and the other end of the driving block is provided with a second inclined surface in sliding connection with the first inclined surface.

4. The slide back prevention mechanism according to claim 3, wherein the number of the movable holes is plural, a plurality of the movable holes are distributed at intervals, and the number of the locking pieces corresponds to the number of the movable holes.

5. The slide back-proof mechanism according to claim 4, wherein the driving block is formed as a cylindrical member, an annular protrusion is provided on an outer peripheral surface of the other end of the driving block, and the second inclined surface is provided on the annular protrusion.

6. The slider anti-backup mechanism according to claim 2, wherein said mounting hole is perpendicular to said movable hole.

7. The slider anti-backup mechanism according to claim 6, wherein said mounting hole and said movable hole are formed in a T-shape in cooperation.

8. The slide block retreat-preventing mechanism according to claim 2, wherein a mounting through hole is formed in one side of the shovel base in the direction of the limiting plate, the mounting through hole is communicated with the mounting hole, and the locking member includes:

the insert is arranged in the mounting through hole and is provided with a mounting channel coaxial with the mounting through hole, and the outer peripheral surface of the insert is provided with a limiting hole communicated with the mounting channel;

the movable piece is arranged in the installation channel, one end of the movable piece is movably connected with the driving piece, and the other end of the movable piece can extend into the limiting hole or be separated from the limiting hole;

one end of the limiting piece is connected with the periphery of the movable piece, and the other end of the limiting piece is inserted into the limiting hole;

the elastic piece is arranged in the installation channel and located between the insert and the limiting piece, and when the locking assembly is located in a locking state, the elastic piece is located in a compression state.

9. The slider anti-backup mechanism according to claim 1, further comprising:

the guide sleeve is arranged on the periphery of the core-pulling sliding block in a surrounding mode.

10. The slide block withdrawing prevention mechanism according to claim 1, wherein a third inclined surface is arranged at the other end of the core-pulling slide block, and a fourth inclined surface in sliding fit with the third inclined surface is arranged on one side of the shovel base in the direction close to the core-pulling slide block.