CN108162335B

CN108162335B - Deep rib large-angle demoulding mechanism for inclined plane of automobile decorative plate support

Info

Publication number: CN108162335B
Application number: CN201711352146.2A
Authority: CN
Inventors: 陈剑波; 陈晨; 胡迪; 戴旭泽; 祝天申; 尤展辉; 王林明
Original assignee: Ningbo Fangzheng Tool Co Ltd
Current assignee: Ningbo Fangzheng Tool Co Ltd
Priority date: 2017-12-15
Filing date: 2017-12-15
Publication date: 2020-08-11
Anticipated expiration: 2037-12-15
Also published as: CN108162335A

Abstract

A deep rib large-angle demoulding mechanism for an inclined plane of an automobile decorative plate support comprises an inclined ejector rod (1), an inclined ejector block (2), a first inclined connecting rod (3) and a first guide block (4) connected to a top plate; the sliding block (5) is connected in the first guide block (4) in a sliding manner, the upper end of the inclined ejector rod (1) is fixedly connected with the inclined ejector block (2), the lower end of the inclined ejector rod (1) is rotatably connected with the sliding block (5), the first guide block (4) is fixedly connected with the top plate, the middle part of the first inclined connecting rod (3) is connected with the sliding block (5) through a first sliding sleeve (6), and the first sliding sleeve (6) is rotatably connected with the sliding block (5); compared with the prior art, the invention has the characteristics of lower processing precision, better use stability and longer maintenance period, and can improve the production continuity of the die so as to improve the production efficiency of the die.

Description

Deep rib large-angle demoulding mechanism for inclined plane of automobile decorative plate support

Technical Field

The invention relates to a demoulding mechanism of a mould, in particular to a large-angle demoulding mechanism of a deep rib on an inclined plane of a support piece of an automobile decorative plate.

Background

The deep ribs (generally, the height of the ribs is higher than the surface of the deep ribs by more than 1 cm), and the deep ribs have an angle on the inclined surface of the support piece of the automobile decorative plate (see figure 10), and the angle is more than 12 degrees, so that a large-angle inclined core-pulling mechanism is needed for demoulding.

The utility model discloses a big angle drawing of patterns of prior art is CN 204054517U as disclosing, and the name is "a practical big angle slant ejecting structure of loosing core that practical big angle slant ejecting structure of loosing core is disclosed, including fixed die plate and movable mould board, be provided with the die cavity that is used for moulding plastics the finished product between fixed die plate and the movable mould board, the lower extreme of fixed die plate is provided with the roof that can move about from top to bottom, install the guide block on the roof, it has the spout of slant upper left to open in the guide block, be provided with the slider in the spout, the slider is connected with the ejector pin through the pivot, the ejector pin passes the inclined hole of slant upper left in the fixed die plate and towards the die cavity, the ejector pin upper end is provided with the oblique kicking block that is used. Though the slider is connected with the ejector pin through the pivot, make oblique kicking block can the wide-angle roll-off and realize loosing core like this, but use in the in-service use process, because slider and ejector pin rotate to be connected, and oblique connecting rod is to the guide block effect, then the guide block also slides, this has just resulted in when the sliding distance is greater than 2cm and above, the machining precision requirement is higher, otherwise the guide block blocks easily and dies and leads to unable complete drawing of patterns, and the bite mark also appears easily on oblique connecting rod, oblique connecting rod damages easily, and oblique connecting rod need just can play a role to the slider through the guide block, lead to slider response speed slower, need the longer distance of roof motion, so the stability in use is relatively poor, the production continuity is relatively poor, finally lead to the mould production efficiency lower.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the automobile decorative plate support piece inclined plane deep rib large-angle demolding mechanism is good in use stability, capable of improving production continuity and capable of improving mold production efficiency.

The technical scheme adopted by the invention is as follows: the deep rib large-angle demoulding mechanism comprises an inclined ejector rod, an inclined jacking block, a first inclined connecting rod and a first guide block connected to a top plate; the inner sliding connection of the first guide block is provided with a sliding block, the upper end of the inclined ejector rod is fixedly connected with the inclined ejector block, the lower end of the inclined ejector rod is rotatably connected with the sliding block, the first guide block is fixedly connected with the top plate, the middle of the first inclined connecting rod is connected with the sliding block through a first sliding sleeve, and the first sliding sleeve is rotatably connected with the sliding block.

Compared with the prior art, the invention has the following characteristics after adopting the technical scheme:

according to the invention, the middle part of the first inclined connecting rod is connected with the sliding block through the first sliding sleeve, the first sliding sleeve is rotatably connected with the sliding block, so that the first guide block can be fixedly connected with the top plate, the first sliding sleeve can eliminate deviation generated in the sliding process due to processing precision and temperature, when the sliding distance is more than 2cm and above, all parts still move flexibly, the clamping condition is not easy to occur, the first inclined connecting rod is not easy to generate a bite mark, and the service life of the first inclined connecting rod is ensured; the first inclined connecting rod is connected with the sliding block, so that the first inclined connecting rod directly drives the sliding block to slide in the ejection process, the response speed of the sliding block is high, the movement distance of the top plate during ejection is shortened, and the size of the die is reduced.

As an improvement, the two ends of the sliding block are split into an I-shaped structure, one end of the sliding block is split and rotatably connected with the lower end of the inclined ejector rod, and the other end of the sliding block is split and rotatably connected with the first sliding sleeve; after the arrangement, the two sides of the sliding sleeve are hinged, so that the stability of the sliding sleeve after connection is better, the size can be reduced, and the influence of thermal expansion is reduced.

As an improvement, the first guide block is divided into a left guide block and a right guide block, a first sliding groove is arranged on the side surface of the left guide block opposite to the right guide block, a second sliding groove is arranged on the side surface of the right guide block opposite to the left guide block, and two sides of the sliding block are respectively connected in the first sliding groove and the second sliding groove in a sliding manner; after setting up like this, can reduce the production degree of difficulty of first guide block, the production of the first guide block of being convenient for reduces manufacturing cost, still can be fast with spout and slider assembled joint, the quick installation of being convenient for.

As an improvement, two ends of the first guide block are respectively provided with a stabilizer bar, the stabilizer bar at one end of the first guide block is at a position close to the lower end, and the stabilizer bar at the other end of the first guide block is at a position close to the upper end; one end of the stabilizer bar is fixedly connected with the left guide block, the other end of the stabilizer bar is fixedly connected with the right guide block, and the stabilizer bar plays a role in limiting the sliding block; after setting up like this, the stabilizer bar not only plays the effect of guide block about stabilizing for the gliding stability of slider is better, still plays the effect spacing to the slider, prevents that the slider from slipping from the spout, guarantees the continuity of production.

As an improvement, the lifting device further comprises a second inclined connecting rod and a second guide block connected to the top plate, wherein a sliding foot is connected to the second guide block in a sliding manner, one end of the sliding foot is forked, the forked end of the sliding foot is hinged with a second sliding sleeve, and the second inclined connecting rod is connected with the second sliding sleeve in a sliding manner; at least one positioning rod is arranged on the sliding foot; positioning holes which correspond to the positioning rods one by one are formed in the inclined ejecting block; the lower end of the positioning rod is fixedly connected with the sliding foot, and the upper end of the positioning rod is connected with the positioning hole in a sliding manner; the included angle between the second inclined connecting rod and the first inclined connecting rod is 1-15 degrees; after the positioning rod is arranged in the mode, the auxiliary positioning of the positioning rod and the movement of the inclined ejector block are limited in the demolding process, so that the processing precision of each part is further reduced, the processing cost is lower, the positioning accuracy and the movement accuracy of the inclined ejector block can be guaranteed, and the product demolding success rate is ensured.

Preferably, the included angle between the second inclined connecting rod and the first inclined connecting rod is 1-5 degrees; within this range of angles, the action of the positioning rod on the lifter block during demoulding is more effective and timely.

As an improvement, a T-shaped third sliding groove is formed in the second guide block; an included angle is formed between the third sliding chute and the horizontal plane, the included angle is an acute angle, and one end of the third sliding chute close to the second inclined connecting rod is higher than one end of the third sliding chute far away from the second inclined connecting rod; the lower end of the sliding foot is connected in the third sliding chute in a sliding manner; after the arrangement, the positioning rod can be vertically arranged, so that the processing difficulty and the processing cost are reduced, and the installation is convenient.

Preferably, when an included angle between the third sliding groove and the horizontal plane is 10-30 degrees within the angle range, the effect of the positioning rod on the inclined ejector block in the demolding process is better.

As an improvement, the number of the positioning rods is two, and the two positioning rods are arranged along the length direction of the sliding foot; after the arrangement, the use stability of the positioning rod is ensured, and meanwhile, the motion stability of the inclined ejecting block can be improved, so that the demolding yield of products is improved.

As an improvement, at least one auxiliary ejection mechanism is arranged on the inclined ejection block, and the auxiliary ejection mechanism comprises an ejector pin, a return spring and a stop block; a step hole is formed in the inclined ejector block, and the axis of the step hole is perpendicular to the vertical line; one end of the ejector pin is connected in the step hole in a sliding mode, the other end of the ejector pin abuts against the stop block, and an annular bulge is arranged on the outer peripheral surface of the ejector pin; the reset spring is sleeved on the thimble, one end of the reset spring is abutted against the step surface in the step hole, and the other end of the reset spring is abutted against the annular bulge; the surface of the stop block, which is abutted against the other end of the thimble, consists of a straight surface and a first inclined surface, the straight surface is positioned below the first inclined surface, and the straight surface and the first inclined surface are in arc transition; one surface of the inclined ejector block close to the stop block is a second inclined surface; the included angle between the second inclined plane and the horizontal plane is larger than the included angle between the first inclined plane and the horizontal plane; after the arrangement, in the initial stage of ejection, the relative position of the ejector pin and the product is unchanged, and the inclined ejector block moves away from the direction of the product, namely when the inclined ejector block is used as a reference object in the initial stage, the product is ejected out in the direction away from the inclined ejector block by the ejector pin, so that the product is easier to separate from the inclined ejector block, the product supporting function is also realized, the deformation of the product in the separating process is prevented, the yield of the product is improved, and the ejector pin resets relative to the inclined ejector block in the later stage of ejection, so as to avoid collision with other parts, and further improve the demolding efficiency.

Drawings

Fig. 1 is a schematic structural view of the deep rib large-angle demolding mechanism for the inclined surface of the automobile decorative plate support (a movable mold, a fixed mold and a top plate are not shown) of the invention.

Fig. 2 is a schematic structural view of the deep-rib large-angle demoulding mechanism for the inclined plane of the support piece of the automobile decorative plate, after a product cavity is removed (a movable mould, a fixed mould and a top plate are not shown).

FIG. 3 is a top view of the deep rib large angle ejection mechanism for the inclined plane of the support of the automobile trim panel of the present invention. Fig. 4 is a sectional view taken along line a-a of fig. 3.

FIG. 5 is a schematic structural diagram of the initial demolding stage of the deep-rib large-angle demolding mechanism for the inclined surface of the automobile decorative panel support.

FIG. 6 is a schematic structural diagram of the complete demolding stage of the deep-rib large-angle demolding mechanism for the inclined surface of the automobile decorative panel support.

FIG. 7 is a schematic perspective view of the deep rib large angle demolding mechanism for the inclined plane of the support member of the automobile trim panel of the invention.

Fig. 8 is a schematic perspective view of the deep-rib large-angle demolding mechanism for the inclined surface of the automobile decorative plate support, which is provided with the first guide block and the second guide block removed.

Fig. 9 is an enlarged view of a portion B in fig. 8. Fig. 10 is a schematic diagram of a product structure.

The device comprises an oblique ejector rod 1, an oblique ejector block 2, an oblique ejector block 3, a first oblique connecting rod 4, a first guide block 41, a left guide block 42, a right guide block 43, a first sliding groove 44, a second sliding groove 5, a sliding block 6, a first sliding sleeve 7, a stabilizing rod 8, a second oblique connecting rod 9, a second guide block 10, a sliding foot 11, a second sliding sleeve 12, a positioning rod 13, a positioning hole 14, a third sliding groove 15, an ejector pin 16, a reset spring 17, a stop block 18, a stepped hole 19, an annular protrusion 20, a straight surface 21, a first inclined surface 22, a second inclined surface 23, an arc-shaped indent 24, a base 25, a pin shaft 26 and a product.

Detailed Description

The invention is further described with reference to the following figures and detailed description. The product structure is shown in fig. 10.

As shown in fig. 1 to 9, the invention provides a deep rib large-angle demoulding mechanism for an inclined surface of a support member of an automobile decorative plate, which comprises an inclined ejector rod 1, an inclined ejector block 2, a first inclined connecting rod 3 and a first guide block 4 connected to a top plate; the upper end of the first inclined connecting rod 3 is connected with the fixed template, the lower end of the first inclined connecting rod 3 is connected with the bottom plate, and the top plate is positioned between the fixed template and the bottom plate

The top plate can move up and down in the space; the upper end surface of the fixed template is provided with a groove for accommodating the inclined ejector block 2, and the fixed template

An inclined hole for the inclined mandril 1 to pass through is arranged on the top plate, and a through hole for the first inclined connecting rod 3 to pass through is arranged on the top plate; in the first guide block 4

The sliding block 5 is connected in a sliding way, the upper end of the inclined ejector rod 1 is fixedly connected with the inclined ejector block 2, and the lower end of the inclined ejector rod 1 is connected with the inclined ejector block through a connecting sleeve

The slide block 5 is rotationally connected, the lower end of the inclined ejector rod 1 is fixedly connected with the connecting sleeve, the first guide block 4 is fixedly connected with the top plate, and

the middle part of an oblique connecting rod 3 is connected with a sliding block 5 through a first sliding sleeve 6, and the first sliding sleeve 6 is rotatably connected with the sliding block 5. First of all

The end surfaces of the two ends of the oblique connecting rod 3 are respectively provided with an arc-shaped indent 23, and the two ends of the first oblique connecting rod 3 are respectively provided with a base 24

Is connected with the fixed template and the bottom plate, a pin shaft 25 is arranged on the base 24, and the arc-shaped concave part 23 at the upper end of the first inclined connecting rod 3 is abutted

On a pin shaft 25 on a fixed template base 24, an arc-shaped concave part 23 at the lower end of the first inclined connecting rod 3 abuts against a bottom plate base

On the round pin axle 25 on 24, the upper and lower extreme of first oblique connecting rod 3 is rotatable after setting up like this, can further eliminate the dead condition of card when ejecting, and still can further reduce the machining precision requirement of each part, reduces the processing cost.

The two ends of the sliding block 5 are forked into an I-shaped structure (also can be understood as an H-shaped structure), and one end of the sliding block 5 is forked and is provided with an inclined ejector rod

The connecting sleeve at the lower end of the sliding block 1 is rotatably connected, and the other end of the sliding block 5 is forked and rotatably connected with the first sliding sleeve 6.

The first guide block 4 is divided into a left guide block 41 and a right guide block 42, and the side surface of the left guide block 41 opposite to the right guide block 42 is provided with a left guide block

A second sliding groove 44 is arranged on the side surface of the first sliding groove 43 opposite to the right guide block 42 and the left guide block 41, and the first sliding groove 43 and the second sliding groove 43

The sliding grooves 44 are opposite, and two sides of the sliding block 5 are respectively connected in the first sliding groove 43 and the second sliding groove 44 in a sliding manner.

The two ends of the first guide block 4 are both provided with stabilizer bars 7, and the stabilizer bar 7 at one end of the first guide block 4 is positioned near the lower end

In the position, the stabilizing rod 7 at the other end of the first guide block 4 is positioned at the position close to the upper end; one end of the stabilizer bar 7 and the left guide block 41

And the other end of the stabilizer bar 7 is fixedly connected with the right guide block 42, and the stabilizer bar 7 has a limiting effect on the sliding block 5.

It also comprises a second inclined connecting rod 8 and a second guide block 9 connected on the top plate, the second guide block 9 is connected in a sliding way

A sliding foot 10 is provided, one end of the sliding foot 10 is forked, the forked end of the sliding foot 10 is hinged with a second sliding sleeve 11, and a second inclined connecting rod 8

Is connected with the second sliding sleeve 11 in a sliding way; the sliding foot 10 is provided with at least one positioning rod 12 (2 in this example, or 1,

3, 4 or 5, etc., set according to the size and length of the pitched roof block); the inclined top block 2 is provided with a positioning rod 12

Positioning holes 13 corresponding to one another; the lower end of the positioning rod 12 is fixedly connected with the sliding foot 10, and the upper end of the positioning rod 12 is connected with the positioning hole

13, sliding connection; the included angle between the second inclined connecting rod 8 and the first inclined connecting rod 3 is 2.5 degrees (also can be 1 degree, 2 degrees),

3 °, 5 °, 8 °, 10 °, 15 °, or the like). The upper end of the second oblique connecting rod 8 is connected with the fixed die plate, the lower end of the second oblique connecting rod 8 is hinged with the bottom plate, so that the situation of clamping during ejection can be further eliminated, the machining precision requirements of all parts can be further reduced, and the machining cost is reduced.

A T-shaped third sliding chute 14 is arranged on the second guide block 9; an included angle is formed between the third sliding chute 14 and the horizontal plane, the included angle is an acute angle, and one end of the third sliding chute 14 close to the second inclined connecting rod 8 is higher than that of the third sliding chute 14 far away from the second inclined connecting rod 8

One end; the lower end of the runner 10 is slidably connected in the third sliding groove 14.

The third sliding groove 14 forms an angle of 20 ° (also 10 °, 15 °, 18 °, 25 °, 28 °, 30 °, etc.) with the horizontal plane.

The number of the positioning rods 12 is two, and the two positioning rods 12 are arranged along the length direction of the sliding foot 10.

At least one auxiliary ejection mechanism (2 in this example, or 1, 3, 4 or 5, etc. according to the size and length of the inclined ejector block) is arranged on the inclined ejector block 2, and the auxiliary ejection mechanism comprises an ejector pin 15, a return spring 16 and a stop block 17; a step hole 18 is formed in the inclined ejector block 2, and the axis of the step hole 18 is perpendicular to the vertical line; one end of the thimble 15

The thimble is slidably connected in the step hole 18, the other end of the thimble 15 abuts against the stop block 17, and the end face of the other end of the thimble 15 is arc-shaped

A ring-shaped bulge 19 is arranged on the outer peripheral surface of the thimble 15; a return spring 16 is sleeved on the thimble 15 and the return spring

One end of the return spring 16 is abutted on the step surface in the step hole 18, and the other end of the return spring 16 is abutted on the annular bulge 19;

the surface of the stop 17 against the other end of the thimble 15 is composed of a straight surface 20 and a first inclined surface 21, the straight surface 20 is located at the first inclined surface

The straight surface 20 and the first inclined surface 21 are in arc transition below the surface 21; one surface of the inclined ejector block 2 close to the stop block 17 is a second inclined surface

A face 22; the angle between the second inclined surface 22 and the horizontal plane is larger than the angle between the first inclined surface 21 and the horizontal plane.

As shown in fig. 4 to 6, during demolding, the top plate drives the first guide block 4 and the second guide block 9 to move upwards, the lower ends of the slide block 5 and the slide foot 10 respectively perform translation and upward movement in an inclined manner under the action of the corresponding first inclined connecting rod 3 and the corresponding second inclined connecting rod 8, and at this time, the ejector pin 15 plays a role of supporting a product under the action of the straight surface 20 of the stop block 17, so that the product is good in stability and not easy to deform under the support of the ejector pin 15 when the inclined ejector block 2 and the product are just separated, and the inclined ejector block 2 and the product are also easier to separate; along with the roof continues upward movement, thimble 15 can slowly retract with oblique kicking block 2 relatively under the effect of first inclined plane 21 until relative with oblique kicking block 2 resets, and the product also separates with oblique kicking block 2 completely this moment, and it can to take out the product, and locating lever 12 is in drawing the product direction of keeping away from with oblique kicking block 2 all the time in drawing of patterns in-process to guarantee the stability that oblique kicking block 2 breaks away from the product, prevent the production of drawing of patterns defect, thereby improve drawing of patterns yield.

The foregoing has described preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary, and various changes made within the scope of the independent claims of the present invention are within the scope of the present invention.

Claims

1. A deep rib large-angle demoulding mechanism for an inclined plane of a support part of an automobile decorative plate comprises an inclined ejector rod (1) and an inclined ejector block

(2) The first inclined connecting rod (3) and a first guide block (4) connected to the top plate; sliding connection has slider (5) in first guide block (4), the upper end and the kicking block (2) fixed connection to one side of ejector pin (1), the lower extreme and slider (5) of ejector pin (1) rotate to be connected its characterized in that to one side: the first guide block (4) is fixedly connected with the top plate, the middle part of the first inclined connecting rod (3) is connected with the sliding block (5) through a first sliding sleeve (6), and the first sliding sleeve (6) and the sliding block

(5) The connecting device is rotatably connected with the base, and further comprises a second inclined connecting rod (8) and a second guide block (9) connected to the top plate, wherein a sliding foot (10) is connected onto the second guide block (9) in a sliding manner, one end of the sliding foot (10) is forked, a second sliding sleeve (11) is hinged to the forked end of the sliding foot (10), and the second inclined connecting rod (8) is connected with the second sliding sleeve (11) in a sliding manner; the sliding foot

(10) At least one positioning rod (12) is arranged on the base; positioning holes (13) which correspond to the positioning rods (12) one by one are formed in the inclined ejecting block (2); the lower end of the positioning rod (12) is fixedly connected with the sliding foot (10), and the upper end of the positioning rod (12) is in sliding connection with the positioning hole (13); the included angle between the second oblique connecting rod (8) and the first oblique connecting rod (3) is 1-15 degrees, and the positioning rod (12) always pulls the oblique jacking block (2) towards the direction far away from the product in the demolding process.

2. The deep-rib large-angle demolding mechanism for the inclined plane of the automobile decorative plate support according to claim 1, characterized in that: the two ends of the sliding block (5) are forked into an I-shaped structure, and one end of the sliding block (5) is forked and is connected with the lower end of the inclined ejector rod (1) in a rotating manner

And the other end of the sliding block (5) is forked and is rotationally connected with the first sliding sleeve (6).

3. The deep-rib large-angle demolding mechanism for the inclined plane of the automobile decorative plate support according to claim 1, characterized in that: first guide block (4) divide into left guide block (41) and right guide block (42), be equipped with first spout (43) on left side guide block (41) and right guide block (42) relative side, be equipped with second spout (44) on right side guide block (42) and left guide block (41) relative side, the both sides difference sliding connection of slider (5) is in first spout (43) and second spout (44).

4. The deep-rib large-angle demolding mechanism for the automobile decorative plate support according to claim 3, characterized in that: the two ends of the first guide block (4) are respectively provided with a stabilizer bar (7), the stabilizer bar (7) at one end of the first guide block (4) is positioned at a position close to the lower end, and the stabilizer bar (7) at the other end of the first guide block (4) is positioned at a position close to the upper end; stabilizer bar (7) one end and left guide block (41) fixed connection, stabilizer bar (7) other end right guide block (42) fixed connection, stabilizer bar (7) play limiting displacement to slider (5).

5. The deep-rib large-angle demolding mechanism for the inclined plane of the automobile decorative plate support according to claim 1, characterized in that: the included angle between the second inclined connecting rod (8) and the first inclined connecting rod (3) is 1-5 degrees.

6. The deep-rib large-angle demolding mechanism for the inclined plane of the automobile decorative plate support according to claim 1, characterized in that: a T-shaped third sliding groove (14) is formed in the second guide block (9); an included angle is formed between the third sliding chute (14) and the horizontal plane, the included angle is an acute angle, and one end, close to the second inclined connecting rod (8), of the third sliding chute (14) is higher than one end, far away from the second inclined connecting rod (8), of the third sliding chute (14); the lower end of the sliding foot (10) is connected in the third sliding groove (14) in a sliding manner.

7. The deep-rib large-angle demolding mechanism for the automobile decorative plate support according to claim 6, characterized in that: an included angle between the third sliding chute (14) and the horizontal plane is 10-30 degrees.

8. The deep-rib large-angle demolding mechanism for the inclined plane of the automobile decorative plate support according to claim 1, characterized in that: the number of the positioning rods (12) is two, and the two positioning rods (12) are arranged along the length direction of the sliding foot (10).

9. The deep-rib large-angle demolding mechanism for the inclined plane of the automobile decorative plate support according to claim 1, characterized in that: at least one auxiliary ejection mechanism is arranged on the inclined ejection block (2), and the auxiliary ejection mechanism comprises an ejector pin (15), a return spring (16) and a stop block (17); a step hole (18) is formed in the inclined ejector block (2), and the axis of the step hole (18) is perpendicular to the vertical line; one end of the thimble (15) is slidably connected in the stepped hole (18), the other end of the thimble (15) is abutted against the stop block (17), and an annular bulge (19) is arranged on the outer peripheral surface of the thimble (15); the reset spring (16) is sleeved on the thimble (15), one end of the reset spring (16) abuts against the step surface in the step hole (18), and the other end of the reset spring (16) abuts against the annular bulge (19); the surface of the stop block (17) abutted against the other end of the thimble (15) consists of a straight surface (20) and a first inclined surface (21), the straight surface (20) is positioned below the first inclined surface (21), and the straight surface (20) and the first inclined surface (21) are in arc transition; one surface of the inclined ejector block (2) close to the stop block (17) is a second inclined surface (22); the included angle between the second inclined surface (22) and the horizontal plane is larger than the included angle between the first inclined surface (21) and the horizontal plane.