CN212241965U

CN212241965U - Slide block anti-retreating mechanism

Info

Publication number: CN212241965U
Application number: CN202020833291.3U
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: 2020-12-29
Anticipated expiration: 2030-05-19

Abstract

The utility model discloses a slider moves back prevention mechanism, include: 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 utility model belongs to the technical field of injection mold designs, especially, relate to a mechanism is prevented moving back by slider.

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.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

In view of this, the utility model provides a mechanism is prevented moving back by slider can prevent to loose core slider retreat and influence the quality of shaping product when the shaping, has compact structure, operates steadily, advantages such as safe and reliable.

According to the utility model discloses slider moves back prevention mechanism, include: 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 utility model discloses slider moving back prevention mechanism, adopt the slider of loosing core, shovel base, the structure that locking subassembly and driving piece combined together, link to each other with shovel base through the slider of loosing core, shovel base and locking subassembly link to each other with the driving piece, the driving piece can drive shovel base and locking subassembly activity, and can drive the locking subassembly in the activity between lock state and unblock state, thereby steerable activity of loosing core slider can not only accomplish to loose core but also can solve the slider of loosing core and retreat and the shaping product quality problem that produces, and this slider moving back prevention mechanism operation safe and reliable.

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.

According to the utility model discloses slider moves back prevention mechanism can also have following additional technical characterstic:

according to the utility model discloses an embodiment, shovel base is close to one side of driving piece is equipped with the open mounting hole of one end, shovel base be equipped with the movable hole that the mounting hole slope set up, the one end of movable hole with the mounting hole intercommunication, the other end of movable hole opens, at least some of driving piece stretches into the mounting hole, the locking subassembly 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 the utility model discloses an embodiment, the other end of locking piece is equipped with first inclined plane, the driving piece 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 the utility model discloses an embodiment, the quantity of activity hole is a plurality of, and is a plurality of the spaced apart distribution of activity hole, the quantity of locking piece with the quantity of activity hole is corresponding.

According to the utility model discloses an embodiment, the drive block forms to the cylindricality piece, be equipped with annular arch on the outer peripheral face of the other end of drive block, be equipped with on the annular arch the second inclined plane.

According to an embodiment of the invention, the mounting hole is perpendicular to the movable hole.

According to the utility model discloses an embodiment, the mounting hole with the activity hole cooperation forms the T font.

According to the utility model discloses an embodiment, the shovel base is close to one side of limiting plate place direction is equipped with the installation through-hole, the installation through-hole with the mounting hole intercommunication, the locking piece 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 the utility model discloses an embodiment, the slider is prevented moving back the mechanism and is still included: the guide sleeve is arranged on the periphery of the core-pulling sliding block in a surrounding mode.

According to the utility model discloses an embodiment, the other end of the slider of loosing core is equipped with the third inclined plane, the shovel base is close to one side of the slider place of loosing core direction be equipped with third inclined plane sliding fit's fourth inclined plane.

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 an embodiment of the present invention;

fig. 4 is a schematic structural view of a core pulling slider according to an embodiment of the present invention;

fig. 5 is a perspective view of a scoop base according to an embodiment of the present invention;

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

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

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

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

fig. 10 is an assembled front view of the shovel base and the driving member in a clamped state according to an embodiment of the present invention;

fig. 11 is a schematic structural view of the shovel base in a second state before the die opening according to an embodiment of the present invention;

fig. 12 is an assembly schematic of the insert, the resilient member and the locking member after unlocking according to an 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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "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, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The following specifically describes the slider retaining mechanism 100 according to an embodiment of the present invention 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-pulling slider 10, a shovel 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, according to the utility model discloses slider anti-moving back mechanism 100 mainly comprises slider 10 of loosing core, shovel base 20, locking subassembly 30 and driving piece 40, and the one end of slider 10 of loosing core is equipped with the mold core that is used for molded product 200, and the other end orientation of slider 10 of loosing core extends away from molded product 200's direction, and shovel base 20 can link to each other with the other end of slider 10 of loosing core.

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.

From this, according to the utility model discloses slider moving back prevention mechanism 100, adopt the slider 10 of loosing core, shovel base 20, the structure that locking subassembly 30 and driving piece 40 combined together, it links to each other with shovel base 20 through the slider 10 of loosing core, shovel base 20 and locking subassembly 30 link to each other with driving piece 40, driving piece 40 can drive shovel base 20 and locking subassembly 30 activity, and can drive the activity of locking subassembly 30 between lock-out state and unblock state, thereby steerable slider 10's the activity of loosing core, can not only accomplish to loose core and can solve the slider 10 back of loosing core and the shaping product 200 quality problems that produce, and this slider moving back prevention mechanism 100 has compact structure, operate steadily and advantages such as safe and reliable.

According to the utility model discloses an embodiment, one side that shovel base 20 is close to driving piece 40 is equipped with the open mounting hole 21 of one end, the installation of driving piece 40 of can being convenient for, can be equipped with the movable hole 22 that sets up with the mounting hole 21 slope on the shovel base 20, the one end of movable hole 22 can communicate with mounting hole 21, the other end of movable hole 22 can open, at least some of driving piece 40 can stretch into mounting hole 21, the driving piece 40 of can being convenient for drives the activity of shovel base 20. 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 plane 34, the inclination angle of the first inclined plane may be generally 45 ° -60 °, the driving member 40 may include an oil 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 oil cylinder 41, the other end of the driving block 42 is provided with a second inclined plane 43 slidably connected to the first inclined plane 34, the second inclined plane 43 may slide along the first inclined plane 34, so that the locking member 32 may be pushed into the limiting hole 33 to lock the locking member 32, and the locking mode has a simple structure and stable 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, so that the driving member 40 drives the locking member 32 to move, thereby facilitating 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 can communicate with the mounting hole 21, the locking member 32 includes an insert 35 and a movable member, the insert 35 can be arranged in the installation through hole 23 and is provided with an installation channel coaxial with the insert, the outer peripheral surface of the insert 35 is provided with a limiting hole 33 communicated with the installation channel, the movable member can be arranged in the installation channel, one end of the movable member can be movably connected with the driving member 40, the other end of the movable member can extend into the limiting hole 33 or be separated from the limiting hole 33, one end of the limiting member is connected with the outer periphery of the movable member, the other end of the limiting member is inserted into the limiting hole 33, the elastic member 38 can be arranged in the installation channel and is located between the insert 35 and the limiting member, and when the locking assembly 30 is located at a locking state, the elastic member 38 is located at a compression.

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 the utility model discloses an embodiment, as shown in fig. 4 and 5, the other end of the slider of loosing core 10 is equipped with third inclined plane 11, and the inclination of third inclined plane 11 can be 15-25, and one side that shovel base 20 is close to the slider 10 place of loosing core direction is equipped with third inclined plane 11 sliding fit's fourth inclined plane 24, can be convenient for loose core slider 10 and shovel base 20's assembly, also be convenient for loose core slider 10 along the activity of fourth inclined plane 24, can improve this slider and prevent moving back the stability of mechanism 100 operation.

The following describes in detail the assembly process and assembly features according to embodiments of the present invention.

According to the utility model discloses slider is prevented moving back mechanism 100 includes movable mould and cover half, movable mould and cover half compound die earlier, driving piece 40 is fixed in on the plunger of hydro-cylinder 41, the plunger pushes driving piece 40 upward activity under the effect of oil pressure, thereby can make driving piece 40 promote the activity that shovel base 20 makes progress, elastic component 38 is in natural state this moment, first inclined plane 34 can be followed to driving piece 40's second inclined plane 43, and can push spacing hole 33 in and lock with the locating part, elastic component 38 is in compression state this moment, slider 10 is in the auto-lock and prevents moving back the state this moment.

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.

All in all, according to the utility model discloses the slider is prevented moving back mechanism 100, adopt the slider 10 of loosing core, shovel base 20, the structure that locking subassembly 30 and driving piece 40 combined together, link to each other with shovel base 20 through the slider 10 of loosing core, shovel base 20 and locking subassembly 30 link to each other with driving piece 40, driving piece 40 can drive shovel base 20 and locking subassembly 30 activity, and can drive locking subassembly 30 in the activity between lock state and the unblock state, thereby steerable slider 10's the activity of loosing core, can not only accomplish to loose core but also can solve the shaping product 200 quality problems that the slider 10 of loosing core moves back and produce, and this slider is prevented moving back mechanism 100 has compact structure, operate steadily and advantages such as safe and reliable.

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 present 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 present 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.