CN113649621B

CN113649621B - Injection mold thimble board punches and uses device

Info

Publication number: CN113649621B
Application number: CN202111212702.2A
Authority: CN
Inventors: 徐洪林
Original assignee: Nantong Hongkuang Molding Technology Co ltd
Current assignee: Nantong Hongkuang Molding Technology Co ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2021-12-31
Anticipated expiration: 2041-10-19
Also published as: CN113649621A

Abstract

The invention relates to the technical field of punching equipment and discloses a device for punching an ejector plate of an injection mold, which comprises a base, wherein hydraulic lifting rods are fixedly connected to the outer surfaces of the top of the left side and the top of the right side of the base respectively, a placing plate is fixedly connected to one ends, far away from the base, of the two hydraulic lifting rods, the interior of the placing plate is hollowed, a rotating rod is arranged at the middle shaft of the placing plate, and the upper end and the lower end of the rotating rod penetrate through the outer wall of the placing plate respectively and extend to the outer side. This injection mold thimble board punches and uses device, the rotation of bull stick can drive the discontinuous striking carriage release lever of rotary rod, the carriage release lever can drive arc shelves pole under the effect of striking force and take place to rotate, when arc shelves pole rotated the extreme point of spout, can make arc shelves pole drive circular scraping ring reciprocate along the emergence of the outer wall relapse of bull stick, and then can make the sweeps that adsorbs on the bull stick outer wall at the in-process of punching clear up and strike off, prevent that it from influencing the effect of punching.

Description

Injection mold thimble board punches and uses device

Technical Field

The invention relates to the technical field of punching equipment, in particular to a punching device for an ejector plate of an injection mold.

Background

In plastic molds, it is also most common to separate the product from the mold; the hard alloy thimble such as a tungsten steel thimble can be used for passing a longer and thinner hole; a thimble, also known as a point, is a conical metal rod with a head that is mounted on a lathe or grinding machine for supporting and rotating a workpiece about it.

What lie in that the thimble suits is, sets up the aperture on the injection mold board, and then the performance of the thimble effect of being convenient for, nevertheless when setting up the aperture on the injection mold board, can produce the sweeps when punching, and the temperature is higher, if not in time clear up it, solidifies on the injection mold board and not clear up and influence the effect of punching well.

Disclosure of Invention

The invention aims to provide a device for punching an ejector plate of an injection mold, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a device for punching an ejector plate of an injection mold comprises a base, wherein hydraulic lifting rods are fixedly connected to the outer surfaces of the top of the left side and the right side of the base respectively, a placing plate is fixedly connected to one end, away from the base, of each hydraulic lifting rod, a rotating rod is arranged in a hollow manner inside the placing plate, the upper end and the lower end of each rotating rod respectively penetrate through the outer wall of the placing plate and extend to the outside, a motor is fixedly connected to an extending portion of the top of each rotating rod, a punching head is fixedly connected to one end, away from the motor, of each rotating rod, a rotating rod is fixedly connected to the outer surface of one end, located inside the placing plate, of each rotating rod respectively, two moving rods are arranged inside the placing plate, the two moving rods are arranged on the left side and the right side of each rotating rod respectively, and one ends, away from the rotating rods, of the two moving rods are fixedly connected with the inside of the placing plate through springs, the outer surface of the middle shaft of the moving rod is respectively hinged with an arc-shaped stop rod, the outer surface of the arc-shaped stop rod is respectively fixedly connected with an arc-shaped spring, the two arc-shaped springs are respectively connected with the outer surface of the two moving rods, the sliding grooves are respectively formed in the left bottom side and the right bottom side of the placing plate, the two sliding grooves penetrate through the inner parts of the two sliding grooves and extend to the outer side of the two sliding grooves respectively at the ends, away from the moving rod, of the arc-shaped stop rods, the two circular scraping rings are respectively fixedly connected with extending parts of the arc-shaped stop rods, and the ends, away from the arc-shaped stop rods, of the circular scraping rings are in contact with the outer surface of the rotating rod.

Preferably, the top left and right sides of base is two splint of fixedly connected with respectively, two the standing groove has been seted up respectively to the surface of splint, two the inside of splint is hollowed the setting, the horizontal slot has been seted up respectively to the upper and lower outer wall of standing groove, a plurality of exhaust hole has been seted up respectively to the surface of splint, a plurality of the exhaust hole is located directly over the standing groove, vertical shifting chute has been seted up respectively to the surface of splint, vertical shifting chute sets up respectively in the left and right sides of splint.

Preferably, the inner wall axis department of standing groove slides and is provided with the stripper bar, the upper and lower both ends that the stripper bar is located the inside one end surface of splint are articulated respectively to have a first arc swinging arms, two the one end that the stripper bar was kept away from to first arc swinging arms is fixedly connected with elastic deformation pole respectively, two the one end that first arc swinging arms was kept away from to elastic deformation pole is fixedly connected with the inner wall of splint.

Preferably, the left end and the right end of the upper side inside the clamping plate are respectively fixedly connected with a gas cavity, the gas cavities are respectively communicated with the exhaust holes, the outer surface of the first arc-shaped oscillating rod is respectively fixedly connected with an oscillating straight rod, the outer surfaces of the left end and the right end of the oscillating straight rod are respectively fixedly connected with piston rods, and one ends, far away from the oscillating straight rod, of the piston rods respectively slide to penetrate through the outer walls of the two gas cavities and extend to the inside.

Preferably, the middle shaft of the outer surface of the elastic deformation rod is fixedly connected with a connecting rod respectively, one end of the connecting rod, far away from the elastic deformation rod, is fixedly connected with a friction limiting plate respectively, and one end of the friction limiting plate, far away from the connecting rod, slides respectively to penetrate through the inside of the transverse groove.

Preferably, the downside elastic deformation pole's bottom side external surface fixedly connected with auxiliary rod, the left and right sides outer wall of auxiliary rod articulates respectively has second arc swinging arms, two the one end that auxiliary rod was kept away from to the second arc swinging arms slides respectively and runs through the inside of vertical shifting chute and extend to the outside, two the extension fixedly connected with release link of second arc swinging arms, two the external surface axis department of second arc swinging arms and the external surface fixedly connected with pull rod of splint.

Compared with the prior art, the invention has the beneficial effects that:

(1) this injection mold thimble board punches and uses device, the rotation of bull stick can drive the striking carriage release lever of rotary rod discontinuity, the carriage release lever can drive arc shelves pole under the effect of striking force and take place to rotate, when arc shelves pole rotates the extreme point of spout, can make arc shelves pole drive circular scraping ring reciprocate along the emergence that the outer wall of bull stick was relapse, and then can make the sweeps that adsorbs on the bull stick outer wall at the in-process of punching clear up and strike off, prevent that it from influencing the effect of punching.

(2) This injection mold thimble board punches and uses device, when the inside of standing groove is placed to the injection mold board, can make the stripper bar move to splint inside under the effect of its extrusion force, force first arc swinging arms and take place the swing in splint inside, take place extrusion deformation to elastic deformation pole with this, can make the friction limiting plate contact with this increase area of contact to the injection mold board surface under the effect of connecting rod under this effect, increase frictional force, thereby furthest prevents that the injection mold board from taking place to remove when punching, the influence effect of punching.

(3) This injection mold thimble board punches and uses device, the swing of first arc swinging arms can drive the piston rod simultaneously and extrude the gas of gas intracavity portion, can make the gas activity space of gas intracavity portion diminish under the effect of extrusion force, and then oppression gas is discharged from the exhaust hole, and the effect that utilizes the air current can in time be cleared up the sweeps on the injection mold board surface, prevents that the sweeps from leaving over on it because the heat and take place to solidify and not clear up at the injection mold board surface.

(4) This injection mold thimble board punches and uses device, the deformation of downside elastic deformation pole can make second arc swinging arms have an outside extrusion force under the effect of auxiliary rod, can make the pull rod drive first arc swinging arms under the effect of extrusion force and take place the swing, and then can make the restoring rod strike injection mold plate's bottom side, strike and can make injection mold plate produce vibrations, and then can make the sweeps vibrate on injection mold plate surface, the air current of being convenient for clears up the sweeps, with this reinforcing the device's clearance ability.

(5) This injection mold thimble board punches and uses device, when the pole that resets strikes the injection mold board, can prevent that the vibrations that the injection mold board produced when punching from having a buffering effect that resets, can in time carry on spacingly like this to the injection mold board, prevent that it from taking place the skew when punching and influencing the effect of punching.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of the overall construction of the present invention;

FIG. 3 is an enlarged view of A of FIG. 2 according to the present invention;

FIG. 4 is a schematic view of the overall structure of the splint of the present invention;

fig. 5 is a sectional view showing the overall structure of the splint of the present invention.

In the figure: 1. a base; 11. a hydraulic lifting rod; 12. placing the plate; 2. a rotating rod; 21. a motor; 22. punching a hole head; 3. rotating the rod; 31. a travel bar; 32. an arc-shaped stop lever; 33. an arc-shaped spring; 4. a chute; 41. a circular scraping ring; 5. a splint; 51. a placement groove; 52. a transverse groove; 53. an exhaust hole; 54. a vertical moving groove; 6. an extrusion stem; 61. a first arcuate swing link; 62. an elastically deformable rod; 7. a gas chamber; 71. swinging the straight rod; 72. a piston rod; 8. a connecting rod; 81. a friction limiting plate; 9. an auxiliary lever; 91. a second arc-shaped oscillating lever; 92. a reset lever; 93. a pull rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides an injection mold thimble board device for punching, including base 1, the purpose that sets up like this is in order to make things convenient for to support whole device, the top surface of the left and right sides of base 1 is fixedly connected with hydraulic lift rod 11 respectively, the purpose that sets up like this is in order to make things convenient for set up hydraulic lift rod 11 and then be convenient for height-adjusting, the one end fixedly connected with that two hydraulic lift rod 11 keep away from base 1 places board 12, the purpose that sets up like this is in order to make things convenient for set up place board 12, the inside of placing board 12 is drawn empty and is set up, the purpose that sets up like this is in order to make things convenient for set up bull stick 2, the axis department of placing board 12 is provided with bull stick 2, the purpose that sets up like this is in order to make things convenient for the rotation of punching head 22, the upper and lower both ends of bull stick 2 run through the outer wall of placing board 12 respectively and extend to the outside, the purpose that sets up like this is in order to make things convenient for the rotation of bull stick 2, top extension fixedly connected with motor 21 of bull stick 2, the purpose of such setting is to facilitate providing external power, a drilling head 22 is fixedly connected to one end of the rotating rod 2 far away from the motor 21, the purpose of such setting is to facilitate drilling, the outer surface of one end of the rotating rod 2, which is located inside the placing plate 12, is fixedly connected with the rotating rod 3, the purpose of such setting is to facilitate setting the rotating rod 3, two moving rods 31 are arranged inside the placing plate 12, the purpose of such setting is to facilitate setting the moving rods 31, the two moving rods 31 are respectively arranged on the left side and the right side of the rotating rod 2, the purpose of such setting is to facilitate moving of the moving rods, one end of the two moving rods 31, which is far away from the rotating rod 2, is fixedly connected with the inside of the placing plate 12 through springs, the purpose of such setting is to facilitate quick resetting of the moving rods 31, the outer surfaces of the middle shafts of the two moving rods 31 are respectively hinged with an arc-shaped stopper 32, the purpose of such setting is to facilitate setting the arc-shaped stopper 32, the outer surfaces of the two arc-shaped stop rods 32 are fixedly connected with arc-shaped springs 33 respectively, the purpose of setting is to facilitate quick return of the arc-shaped stop rods 32, one ends of the two arc-shaped springs 33 far away from the arc-shaped stop rods 32 are fixedly connected with the outer surfaces of the two moving rods 31 respectively, the purpose of setting is to facilitate fixed connection of the arc-shaped springs 33, the left bottom side and the right bottom side of the placing plate 12 are respectively provided with a sliding groove 4, the purpose of setting is to facilitate rotation of the arc-shaped stop rods 32, one ends of the two arc-shaped stop rods 32 far away from the moving rods 31 respectively penetrate through the inner parts of the two sliding grooves 4 and extend to the outer sides, the purpose of setting is to facilitate rotation of the arc-shaped stop rods 32, the extending parts of the two arc-shaped stop rods 32 are fixedly connected with circular scraping rings 41 respectively, the purpose of setting is to facilitate setting of the circular scraping rings 41, one ends of the circular scraping rings 41 far away from the arc-shaped stop rods 32 are in contact with the outer surfaces of the rotating rods 2, this is provided to facilitate cleaning of the outer surface of the turning bar 2.

Preferably, in this embodiment, in order to fix the injection mold plate, two clamp plates 5 are fixedly connected to the left and right sides of the top of the base 1, respectively, so as to facilitate the arrangement of the clamp plates 5, placing grooves 51 are formed on the outer surfaces of the two clamp plates 5, respectively, so as to facilitate the arrangement of the injection mold plate, the two clamp plates 5 are disposed in a hollow manner, so as to facilitate the arrangement of the internal structure, transverse grooves 52 are formed on the upper and lower outer walls of the placing grooves 51, respectively, so as to facilitate the arrangement of the transverse grooves 52, a plurality of exhaust holes 53 are formed on the outer surface of the clamp plate 5, so as to facilitate the entry and exit of gas, the plurality of exhaust holes 53 are located right above the placing grooves 51, so as to facilitate the exhaust, vertical moving grooves 54 are formed on the outer surface of the clamp plate 5, this is for the purpose of facilitating the arrangement of the vertical moving grooves 54, and the vertical moving grooves 54 are opened on the left and right sides of the chucking plate 5, respectively.

Preferably, in this embodiment, in order to facilitate the extrusion force of injection mold plate, the sliding of inner wall axis department of standing groove 51 is provided with pressure ram 6, the purpose that sets up like this is for facilitating the setting up pressure ram 6, the upper and lower both ends that pressure ram 6 is located the inside one end surface of splint 5 articulate respectively has first arc swinging arms 61, the purpose that sets up like this is for facilitating the setting up first arc swinging arms 61, the one end difference fixedly connected with elastic deformation pole 62 that pressure ram 6 was kept away from to two first arc swinging arms 61, the purpose that sets up like this is for facilitating the setting up elastic deformation pole 62, the one end that first arc swinging arms 61 was kept away from to two elastic deformation poles 62 is fixedly connected with the inner wall of splint 5, the purpose that sets up like this is for facilitating the fixing elastic deformation pole 62.

Preferably, in this embodiment, in order to facilitate the squeezing of the gas in the gas chamber 7, the gas chamber 7 is fixedly connected to each of the left and right ends of the upper side of the interior of the clamping plate 5, this is for the purpose of facilitating the fixation of the gas chambers 7, the two gas chambers 7 being respectively provided in communication with the exhaust holes 53, the purpose of the arrangement is to facilitate the air to enter and exit, the outer surfaces of the upper first arc-shaped swinging rods 61 are respectively fixedly connected with a swinging straight rod 71, the purpose of this arrangement is to facilitate the arrangement of the oscillating straight rod 71, the outer surfaces of the left and right ends of the oscillating straight rod 71 are fixedly connected with piston rods 72 respectively, the purpose of this arrangement is to facilitate the arrangement of the piston rods 72, and the ends of the two piston rods 72 away from the straight swinging rod 71 respectively slide through the outer walls of the two gas chambers 7 and extend to the inside, so as to facilitate the extrusion of the gas inside.

Preferably, in this embodiment, in order to facilitate carrying out spacing processing to the injection mold board, the axis department difference fixedly connected with connecting rod 8 of two elastic deformation pole 62 surfaces, the purpose that sets up like this is in order to facilitate setting up connecting rod 8, the one end difference fixedly connected with friction limiting plate 81 of elastic deformation pole 62 is kept away from to two connecting rods 8, the purpose that sets up like this is in order to facilitate setting up friction limiting plate 81, the one end that connecting rod 8 was kept away from to two friction limiting plate 81 slides respectively and runs through the inside of horizontal groove 52, the purpose that sets up like this is in order to facilitate the removal of friction limiting plate 81.

Preferably, in this embodiment, in order to enhance the ability of limiting the injection mold plate and simultaneously enhancing the ability of cleaning the waste scraps on the injection mold plate, an auxiliary rod 9 is fixedly connected to the outer surface of the bottom side of the lower elastic deformation rod 62, the purpose of the arrangement is to facilitate the arrangement of the auxiliary rod 9, the outer walls of the left side and the right side of the auxiliary rod 9 are respectively hinged with a second arc-shaped oscillating rod 91, the purpose of the arrangement is to facilitate the arrangement of the second arc-shaped oscillating rod 91, one end of each of the two second arc-shaped oscillating rods 91, which is far away from the auxiliary rod 9, slides through the inside of the vertical moving groove 54 and extends to the outside, the purpose of the arrangement is to facilitate the movement of the second arc-shaped oscillating rods 91, the extending portions of the two second arc-shaped oscillating rods 91 are fixedly connected with a reset rod 92, the purpose of the arrangement is to facilitate the arrangement of the reset rod 92, a pull rod 93 is fixedly connected to the outer surface central axes of the two second arc-shaped oscillating rods 91 and the outer surface of the clamping plate 5, this is for the purpose of facilitating the arrangement of the pull rod 93.

The working principle is as follows:

the staff can place the injection mold board inside the standing groove 51, and then fix the injection mold board, start the motor 21, the start of the motor 21 can drive the rotating rod 2 to rotate, the rotation of the rotating rod 2 can drive the discontinuous impact moving rod 31 of the rotating rod 3, the moving rod 31 can drive the arc-shaped blocking rod 32 to rotate under the impact force, when the arc-shaped blocking rod 32 rotates to the end point of the sliding groove 4, the arc-shaped blocking rod 32 can drive the circular scraping ring 41 to repeatedly move up and down along the outer wall of the rotating rod 2, and then the scraps adsorbed on the outer wall of the rotating rod 2 in the punching process can be cleaned and scraped, and the punching effect can be prevented from being influenced, secondly, when the injection mold board is placed inside the standing groove 51, the extrusion rod 6 can move towards the inside of the clamping plate 5 under the effect of the extrusion force, the first arc-shaped oscillating rod 61 is forced to swing inside the clamping plate 5, take place extrusion deformation with this to elastic deformation pole 62, can make friction limiting plate 81 contact with this increase area of contact, increase frictional force to the injection mold board surface under the effect of connecting rod 8 under this effect to furthest prevents that the injection mold board from taking place to remove when punching, influences the effect of punching.

Meanwhile, the swing of the first arc-shaped oscillating rod 61 can drive the piston rod 72 to extrude the gas in the gas cavity 7, the gas moving space in the gas cavity 7 can be reduced under the action of the extrusion force, and then the gas is pressed to be discharged from the exhaust hole, the scraps on the outer surface of the injection mold plate can be cleaned in time under the action of the air flow, the scraps are prevented from being left on the upper surface and being solidified on the outer surface of the injection mold plate due to heat, and then the deformation of the lower side elastic deformation rod 62 can enable the second arc-shaped oscillating rod 91 to have an outward extrusion force under the action of the auxiliary rod 9, the pull rod 93 can drive the first arc-shaped oscillating rod 61 to swing under the action of the extrusion force, so that the reset rod 92 can knock the injection mold plate, the knocking can enable the injection mold plate to vibrate, and further the scraps can vibrate on the bottom side of the injection mold plate, the air current of being convenient for clears up the sweeps to this reinforcing the device's clearance ability, simultaneously, when release link 92 carries out the striking to the injection mold board, can prevent that the vibrations that the injection mold board produced when punching from having the effect that a buffering resets, can in time carry on spacingly like this to the injection mold board, prevent that it from taking place the skew and influencing the effect of punching when punching.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an injection mold thimble board punches and uses device, includes base (1), its characterized in that: the outer surfaces of the tops of the left side and the right side of the base (1) are respectively fixedly connected with hydraulic lifting rods (11), one ends, far away from the base (1), of the two hydraulic lifting rods (11) are fixedly connected with a placing plate (12), the inside of the placing plate (12) is hollowed out, a rotating rod (2) is arranged at the middle shaft of the placing plate (12), the upper end and the lower end of the rotating rod (2) respectively penetrate through the outer wall of the placing plate (12) and extend to the outside, a motor (21) is fixedly connected with a top extending part of the rotating rod (2), one end, far away from the motor (21), of the rotating rod (2) is fixedly connected with a punching head (22), the outer surface of one end, located inside the placing plate (12), of the rotating rod (2) is respectively and fixedly connected with a rotating rod (3), two moving rods (31) are arranged inside the placing plate (12), and the two moving rods (31) are respectively arranged at the left side and the right side of the rotating rod (2), one ends of the two moving rods (31) far away from the rotating rod (2) are fixedly connected with the inside of the placing plate (12) through springs, the outer surfaces of the middle shafts of the two moving rods (31) are respectively hinged with an arc-shaped blocking rod (32), the outer surfaces of the two arc-shaped blocking rods (32) are respectively and fixedly connected with arc-shaped springs (33), one ends of the two arc-shaped springs (33) far away from the arc-shaped blocking rods (32) are respectively and fixedly connected with the outer surfaces of the two moving rods (31), the left bottom side and the right bottom side of the placing plate (12) are respectively provided with a sliding chute (4), one end of each of the two arc-shaped stop rods (32) far away from the moving rod (31) respectively penetrates through the inner parts of the two sliding chutes (4) in a sliding manner and extends to the outer side, the extending parts of the two arc-shaped stop rods (32) are respectively and fixedly connected with a circular scraping ring (41), one end of the circular scraping ring (41) far away from the arc-shaped stop lever (32) is in contact with the outer surface of the rotating rod (2).

2. The device for punching the ejector plate of the injection mold according to claim 1, wherein: the utility model discloses a clamp plate, including base (1), the top left and right sides of base (1) is two splint (5) of fixedly connected with respectively, two standing groove (51) have been seted up respectively to the surface of splint (5), two the inside of splint (5) is drawn empty and is set up, horizontal slot (52) have been seted up respectively to the upper and lower outer wall of standing groove (51), a plurality of exhaust hole (53) have been seted up respectively to the surface of splint (5) exhaust hole (53) are located directly over standing groove (51), vertical shifting chute (54) have been seted up respectively to the surface of splint (5), the left and right sides at splint (5) is seted up respectively to vertical shifting chute (54).

3. The device for punching the ejector plate of the injection mold according to claim 2, wherein: the inner wall axis department of standing groove (51) slides and is provided with squeeze bar (6), the upper and lower both ends that squeeze bar (6) are located the inside one end surface of splint (5) are articulated respectively to have first arc swinging arms (61), two the one end that squeeze bar (6) were kept away from in first arc swinging arms (61) is fixedly connected with elastic deformation pole (62) respectively, two the one end that first arc swinging arms (61) were kept away from in elastic deformation pole (62) and the inner wall fixed connection of splint (5).

4. The device for punching the ejector plate of the injection mold according to claim 3, wherein: both ends are fixedly connected with gas chamber (7) respectively about the inside upside of splint (5), two gas chamber (7) set up with exhaust hole (53) intercommunication respectively, the upside the surface of first arc swinging arms (61) is fixedly connected with swing straight-bar (71) respectively, swing straight-bar (71) about both ends surface is fixedly connected with piston rod (72) respectively, two the one end that swing straight-bar (71) were kept away from in piston rod (72) slides respectively and runs through the outer wall of two gas chambers (7) and extend to inside.

5. The device for punching the ejector plate of the injection mold according to claim 4, wherein: two axis department fixedly connected with connecting rod (8) respectively of elastically deforming pole (62) surface, two the one end fixedly connected with friction limiting plate (81) respectively that elastically deforming pole (62) were kept away from in connecting rod (8), two the one end that connecting rod (8) were kept away from in friction limiting plate (81) slides respectively and runs through the inside of horizontal groove (52).

6. The apparatus of claim 5, wherein the ejector plate of the injection mold is provided with: downside the bottom side external surface fixed connection of elastic deformation pole (62) has auxiliary rod (9), the left and right sides outer wall of auxiliary rod (9) articulates respectively has second arc swinging arms (91), two the one end that auxiliary rod (9) were kept away from in second arc swinging arms (91) slides respectively and runs through the inside of vertical shifting chute (54) and extend to the outside, two extension fixedly connected with release link (92), two of second arc swinging arms (91) the surface axis department of second arc swinging arms (91) and the external surface fixed connection of splint (5) have pull rod (93).