CN113211723A

CN113211723A - Two-section screw unscrewing structure

Info

Publication number: CN113211723A
Application number: CN202110641776.1A
Authority: CN
Inventors: 周陈锋
Original assignee: Zhuji Kexun Electronic Technology Co ltd
Current assignee: Zhuji Kexun Electronic Technology Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-08-06

Abstract

The invention discloses a two-section type screw unscrewing structure, which comprises a lower die core arranged at the center of a lower die plate, wherein a lower cavity for forming a pipe joint is processed on the lower die core; the two sides of the lower die core are respectively provided with a sliding block device in a sliding manner, the sliding block devices are rotationally clamped with a threaded core, the sliding block devices are extruded by the upper die plate to drive the threaded core to move forwards to a forming position of an internal thread of a pipe orifice of the pipe joint during die assembly, the rear end of the threaded core is sleeved with a rotating shaft for driving the threaded core to rotate, and the rotating shaft is connected with a driving mechanism; the slide block device is internally sleeved with a return spring which is abutted with the lower die core, the return spring pushes the slide block device to pull the thread core to move backwards relative to the rotating shaft after the die is opened, so as to rotate and demold, and an ejection mechanism for ejecting the pipe joint out of the lower die cavity is arranged below the lower die plate. The invention has simple structure and high stability, can effectively prevent thread from being pulled, reduces the abrasion of the die core and prolongs the service life of the die.

Description

Two-section screw unscrewing structure

Technical Field

The invention relates to the technical field of dies, in particular to a screwing-off structure applied to a die, and specifically relates to a two-section type screw screwing-off structure.

Background

In the prior art, for the die for forming the tube joint with the cross structure, because the left end and the right end of the tube joint product are threaded holes, when the core needs to be pulled after the upper die plate and the lower die plate are opened, if careless, a threaded core for forming the threaded holes can strain the threaded holes, and the improper core pulling also easily causes abrasion of a die core, so that the structure of the tube joint needs to be reformed.

Disclosure of Invention

The present invention provides a two-stage screw unscrewing structure, which is designed reasonably, and can effectively prevent thread from pulling, reduce abrasion of a mold core, and prolong the service life of a mold.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a two-section screw unscrewing structure comprises a lower die core fixedly arranged at the center of a lower die plate, wherein a lower die cavity for forming a pipe joint is processed on the lower die core; the two sides of the lower die core are respectively provided with a sliding block device in a sliding manner, the sliding block devices are rotationally clamped with thread cores for forming internal threads of the pipe orifice of the pipe joint, the sliding block devices are extruded by the upper die plate to drive the thread cores to move forwards to a forming position of the internal threads of the pipe orifice when die assembly is carried out, the rear ends of the thread cores are sleeved with rotating shafts for driving the thread cores to rotate in a front-back sliding manner, and the rotating shafts are connected with driving mechanisms for driving the rotating shafts to rotate; the slide block device is internally sleeved with a return spring which is abutted with the lower die core, the return spring pushes the slide block device to pull the thread core to move backwards relative to the rotating shaft after the die is opened, so as to rotate and demould, and an ejection mechanism for ejecting the pipe joint out of the lower die cavity is arranged below the lower die plate.

In order to optimize the technical scheme, the specific measures adopted further comprise:

the sliding block device consists of a sliding block and a sliding block insert assembled on the front end surface of the sliding block; the slide block and the slide block insert are matched to form an assembling through hole for rotatably installing the threaded core, the threaded core is rotatably and supportingly installed in the assembling through hole of the slide block device through a needle bearing, a limiting groove for preventing the threaded core from moving back and forth relative to the slide block device is formed in the assembling through hole, and a limiting convex ring in limiting and clamping fit with the limiting groove is formed on the threaded core.

Three spring holes are processed below the front end face of the sliding block at equal intervals, a return spring is installed in each spring hole, the front end of each return spring is abutted against the side face of the lower die core, and the rear end of each return spring is abutted against the bottom face of the corresponding spring hole; the rear end face of the sliding block is a stress inclined face, a wear-resistant stress plate is arranged on the stress inclined face, an inclined wedge block is arranged on the upper template, and the inclined wedge block is matched with the stress plate in a sliding mode to extrude the sliding block to move forwards when the die is closed.

The driving mechanism comprises a gear box fixed on the lower template and a hydraulic motor arranged on the gear box, wherein a large gear and a small gear meshed with the large gear are rotatably arranged in the gear box; the small gear is connected with the power transmission of the rotating shaft, and the large gear is fixedly sleeved on the power output shaft of the hydraulic motor.

The rear of the threaded core is provided with a square sliding hole, the front section of the rotating shaft is a square rod section which is in sliding fit with the square sliding hole, the rear end of the rotating shaft is rotatably supported and installed in the gear box through a small bearing, the small gear is fixedly sleeved at the rear end of the rotating shaft, and a large bearing for improving the rotating stability of the power output shaft is sleeved on the power output shaft of the hydraulic motor.

The lower template is provided with a guide channel for guiding the sliding block to slide forwards and backwards, and two sides of the sliding block are provided with sliding rails matched with the guide channel in a sliding and guiding manner.

The lower template is fixedly arranged on a demoulding frame consisting of a supporting plate and a bottom plate, the ejection mechanism comprises an ejection plate arranged in the demoulding frame and an ejector rod fixed on the ejection plate, and the top end of the ejector rod sequentially penetrates through an ejector rod sliding hole formed in the lower template and an ejector rod sliding hole formed in the lower mould core to extend into a lower cavity of the lower mould core.

Two lower cavities are machined in parallel on the lower die core, correspondingly, two threaded cores are rotatably installed on each sliding block device, two small gears are arranged in the gear box, and two ejector rods are installed on the top plate.

Compared with the prior art, the invention utilizes the driving mechanism to drive the rotating shaft to rotate firstly, and then the rotating shaft drives the threaded core to rotate, so that the rotating shaft can filter out the transverse force brought by the gear of the driving mechanism, and the threaded core can rotate more stably, thereby ensuring that the internal thread in the pipe orifice of the pipe joint cannot be damaged by pulling, reducing the abrasion of the lower die core, improving the product quality and prolonging the service life of the die.

The invention has simple structure and high stability, can effectively prevent thread from being pulled, reduces the abrasion of the die core and prolongs the service life of the die.

Drawings

FIG. 1 is a top view of the present invention;

FIG. 2 is a sectional view in the direction A-A of FIG. 1;

FIG. 3 is a sectional view in the direction B-B of FIG. 1;

FIG. 4 is a sectional structural view of the threaded core of the present invention;

FIG. 5 is a cross-sectional structural view of the slider device of the present invention;

FIG. 6 is a schematic perspective view of the drive mechanism of the present invention;

fig. 7 is a schematic perspective view of the slider device of the present invention.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 7 are structural illustrations of the present invention.

Wherein the reference numerals are: the device comprises a pipe joint G, a needle bearing Z1, a small bearing Z2, a large bearing Z3, a lower die plate 1, a lower die core 2, a sliding block device 3, an assembling through hole 3a, a limiting groove 3b, a sliding block 31, a sliding rail 311, a sliding block insert 32, a stress plate 33, a threaded core 4, a square sliding hole 4a, a limiting convex ring 41, a rotating shaft 5, a square rod section 51, a driving mechanism 6, a gear box 61, a hydraulic motor 62, a large gear 63, a small gear 64, a return spring 7, an ejector plate 81, an ejector rod 82, a supporting plate 91 and a bottom plate 92.

As shown in fig. 1 to 7, the present invention discloses a two-stage screw unscrewing structure used on a mold, which includes a lower mold core 2 fixedly installed at the center of a lower mold plate 1, and a lower cavity for molding a pipe joint G is processed on the lower mold core 2. Two sides of the lower die core 2 are respectively provided with a slide block device 3, and the slide block devices 3 can slide forwards or backwards on the lower die plate 1. The forward movement of the slide block device 3 is referred to as the movement of the slide block device 3 toward the lower mold core 2, and the backward movement of the slide block device 3 is referred to as the movement away from the lower mold core 2. And a threaded core 4 for forming internal threads at the pipe opening of the pipe joint G is rotationally clamped on the sliding block device 3. The die is used for forming the pipe joint G, as can be seen from figure 7, the pipe joint G is in a cross structure, internal threads are designed in ports at two ends of the pipe joint G, and therefore a thread type head used for forming the internal threads of the pipe joint G is machined at the front end of the thread core 4. When an upper template (not shown in the figure of the invention) and a lower template 1 are matched, the slide block device 3 can drive the thread core 4 to move forwards to a forming position of the internal thread of the pipe orifice under the extrusion pushing of the upper template. And after the upper template and the lower template are matched, the pipe joint G can be prepared by injection molding. The rear end of the threaded core 4 is provided with a rotating shaft 5 for driving the threaded core 4 to rotate, and the threaded core 4 is connected with the rotating shaft 5 in a sliding sleeved mode, so that the threaded core 4 can slide back and forth along the rotating shaft 5 while rotating. The rotation shaft 5 is connected to a drive mechanism 6 for driving the rotation shaft 5 to rotate. As shown in fig. 7, a return spring 7 abutting against the lower core 2 is fitted in the slider unit 3. After the die is opened, the upper die plate is separated from the lower die plate 1, the sliding block device 3 loses extrusion thrust, and at the moment, the reset spring 7 can utilize self-stored spring force to rotate the threaded core 4, and meanwhile, the elastic force pushes the sliding block device 3 to pull the threaded core 4 to move backwards relative to the rotating shaft 5, so that the threaded core 4 is withdrawn from the opening of the pipe joint G, and the rotary demolding of the threaded core 4 is completed. And an ejection mechanism is arranged below the lower template 1, and can act after the thread core 4 finishes demoulding and core pulling to eject the formed pipe joint G in the lower cavity out of the lower cavity from bottom to top.

In the embodiment shown in fig. 5, the slider unit 3 is composed of a slider 31 and a slider insert 32 fitted on the front end surface of the slider 31. The slide inserts 32 are adapted to cooperate with the slides 31 to hold the threaded core 4 for facilitating the mounting of the threaded core 4. The slider 31 is formed with a fitting through hole 3a for rotatably fitting the screw core 4 in cooperation with the slider insert 32, and the screw core 4 is fitted with a needle bearing Z1 and rotatably supported by the needle bearing Z1 to be fitted in the fitting through hole 3a of the slider device 3. A limiting groove 3b is formed in the assembling through hole 3a, and a limiting convex ring 41 which is in limiting clamping fit with the limiting groove 3b is formed on the threaded core 4. The matching of the limit groove 3b and the limit convex ring 41 ensures that the thread core 4 can only rotate relative to the slide block device 3 and can not move back and forth.

In the embodiment shown in fig. 7, three spring holes are formed below the front end face of the slider 31 at equal intervals, and each spring hole is provided with a return spring 7. The front end of the reset spring 7 is connected with the side surface of the lower die core 2 in a propping manner, and the rear end of the reset spring 7 is connected with the bottom surface of the spring hole in a propping manner. The rear end face of the slide block 31 is a stress inclined plane, and a wear-resistant stress plate 33 is installed on the stress inclined plane. The upper template of the invention is provided with a wedge block, the wedge block is matched with a stress plate 33 in a sliding and extruding way when the die is closed, and the wedge block pushes a slide block 31 to move forwards through thrust generated by the motion of an inclined plane.

As shown in fig. 6, the driving mechanism 6 of the present invention includes a gear case 61 fixed to the lower die plate 1 and a hydraulic motor 62 mounted on the gear case 61. A large gear 63 and a small gear 64 engaged with the large gear 63 are rotatably mounted in the gear case 61. The pinion 64 is connected to the rotary shaft 5 for power transmission, and the bull gear 63 is fixedly fitted to the power output shaft of the hydraulic motor 62. The hydraulic motor 62 drives the screw core 4 to rotate sequentially through the large gear 63, the small gear 64, and the rotating shaft 5.

In the embodiment, a square sliding hole 4a is formed in the rear surface of the threaded core 4, and the front section of the rotating shaft 5 is a square rod section 51 which is in sliding fit with the square sliding hole 4 a. The rear end of the rotary shaft 5 is rotatably supported in the gear case 61 via a small bearing Z2, the pinion 64 is fixed to the rear end of the rotary shaft 5 in a fitted manner, and a large bearing Z3 for improving the rotational stability of the power output shaft is fitted to the power output shaft of the hydraulic motor 62.

In the embodiment, a guide channel for guiding the sliding block 31 to slide back and forth is formed on the lower template 1 of the present invention, and slide rails 311 slidably matched with the guide channel are formed on both sides of the sliding block 31.

In the embodiment, the lower template 1 of the invention is fixedly arranged on a demoulding frame formed by a supporting plate 91 and a bottom plate 92, the ejection mechanism comprises an ejection plate 81 arranged in the demoulding frame and an ejector rod 82 fixed on the ejection plate 81, and the top end of the ejector rod 82 sequentially penetrates through an ejector rod slide hole formed in the lower template 1 and an ejector rod slide hole formed in the lower mould core 2 to extend into a lower cavity of the lower mould core 2.

As shown in fig. 1, two lower cavities are machined in parallel on the lower die core 2 of the present invention, correspondingly, two threaded cores 4 are rotatably installed on each slide block device 3, two pinions 64 are provided in the gear box 61, and two push rods 82 are installed on the top plate 81. The lower die core 2 is provided with two lower die cavities, so that two pipe joints G can be produced at one time.

The invention has the advantages that: the revolving force of actuating mechanism 6 output is transmitted for moving screw core 4 through axis of rotation 5, and the produced transverse force of gear drive all is filtered when pivoted like this to make screw core 4 very stable when rotatory, also can be less a lot with the wearing and tearing of lower mould benevolence 2, the probability that the product pulled the screw thread when the most important is pivoted is very low, and the mould life-span also can be in the increase of range.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the invention.

Claims

1. A two-section screw unscrewing structure comprises a lower mold core (2) fixedly installed at the center of a lower template (1), wherein a lower mold cavity for forming a pipe joint (G) is processed on the lower mold core (2); the method is characterized in that: the die comprises a lower die core (2) and a lower die core (2), wherein two sides of the lower die core (2) are respectively provided with a sliding block device (3) in a sliding manner, a threaded core (4) for forming an internal thread of a pipe orifice of a pipe joint (G) is rotationally clamped on the sliding block devices (3), the sliding block devices (3) are extruded by an upper die plate to drive the threaded core (4) to move forwards to a forming position of the internal thread of the pipe orifice when die assembly is carried out, the rear end of the threaded core (4) is sleeved with a rotating shaft (5) for driving the threaded core (4) to rotate in a front-back sliding manner, and the rotating shaft (5) is connected with a driving mechanism; the die-casting die is characterized in that a return spring (7) which is in abutting connection with the lower die core (2) is sleeved in the sliding block device (3), the return spring (7) pushes the sliding block device (3) to pull the threaded core (4) to move backwards relative to the rotating shaft (5) to rotate and demould after the die is opened, and an ejection mechanism for ejecting the pipe joint (G) out of the lower die cavity is arranged below the lower die plate (1).

2. The two-stage screwdriver structure of claim 1, further comprising: the sliding block device (3) consists of a sliding block (31) and a sliding block insert (32) assembled on the front end surface of the sliding block (31); the thread core (4) is rotatably supported and installed in the assembling through hole (3a) of the slider device (3) through a needle bearing (Z1), a limiting groove (3b) used for preventing the thread core (4) from moving back and forth relative to the slider device (3) is formed in the assembling through hole (3a), and a limiting convex ring (41) in limiting and clamping fit with the limiting groove (3b) is formed on the thread core (4).

3. The two-stage screwdriver structure of claim 2, further comprising: three spring holes are machined below the front end face of the sliding block (31) at equal intervals, a return spring (7) is installed in each spring hole, the front end of each return spring (7) is abutted against the side face of the lower die core (2), and the rear end of each return spring (7) is abutted against the bottom face of the spring hole; the rear end face of the sliding block (31) is a stress inclined face, a wear-resistant stress plate (33) is installed on the stress inclined face, an inclined wedge block is installed on the upper template, and the inclined wedge block is matched with the stress plate (33) in a sliding mode to extrude the sliding block (31) to move forwards when the die is closed.

4. The two-stage screwdriver structure as claimed in claim 3, wherein: the driving mechanism (6) comprises a gear box (61) fixed on the lower template (1) and a hydraulic motor (62) arranged on the gear box (61), wherein a large gear (63) and a small gear (64) meshed with the large gear (63) are rotatably arranged in the gear box (61); the small gear (64) is connected with the rotating shaft (5) in a power transmission way, and the large gear (63) is fixedly sleeved on a power output shaft of the hydraulic motor (62).

5. The two-stage screwdriver structure as claimed in claim 4, wherein: the rear surface of the threaded core (4) is provided with a square sliding hole (4a), the front section of the rotating shaft (5) is a square rod section (51) which is in sliding fit with the square sliding hole (4a), the rear end of the rotating shaft (5) is rotatably supported and installed in the gear box (61) through a small bearing (Z2), the small gear (64) is fixedly sleeved at the rear end of the rotating shaft (5), and a large bearing (Z3) for improving the rotating stability of the power output shaft is sleeved on the power output shaft of the hydraulic motor (62).

6. The two-stage screwdriver structure as claimed in claim 5, wherein: the lower template (1) is formed with a guide channel for guiding the front and back sliding of the sliding block (31), and two sides of the sliding block (31) are formed with sliding rails (311) in sliding guide fit with the guide channel.

7. The two-stage screwdriver structure as claimed in claim 6, wherein: the lower die plate (1) is fixedly installed on a die releasing frame formed by a supporting plate (91) and a bottom plate (92), the ejection mechanism comprises an ejection plate (81) arranged in the die releasing frame and an ejector rod (82) fixed on the ejection plate (81), and the top end of the ejector rod (82) sequentially penetrates through an ejector rod sliding hole formed in the lower die plate (1) and an ejector rod sliding hole formed in the lower die core (2) to extend into a lower die cavity of the lower die core (2).

8. The two-stage screwdriver structure of claim 7, further comprising: two lower cavities are machined in parallel on the lower die core (2), correspondingly, two threaded cores (4) are rotatably mounted on each sliding block device (3), two small gears (64) are arranged in the gear box (61), and two ejector rods (82) are mounted on the top plate (81).