阅读说明：本技术 塑料制品成型机的机架结构 (Frame structure of plastic product forming machine ) 是由 徐文良 何建领 李明 刘俊 庞阳 肖宇韬 肖志林 于 2019-11-26 设计创作，主要内容包括：一种塑料制品成型机的机架结构,属于塑料制品成型机械技术领域。包括一对上拉杆和一对下拉杆,一对上拉杆的左端和右端及一对下拉杆的左端和右端各构成有拉杆外螺纹,在对应于拉杆外螺纹的位置旋配有拉杆螺母,特点：在拉杆螺母的一端的拉杆螺母内端面上且围绕拉杆螺母的圆周方向设拉杆螺母膨胀环形槽,对应于拉杆螺母膨胀环形槽的内侧的壁体构成为拉杆螺母受力内壁,对应于拉杆螺母膨胀环形槽的外侧的壁体构成为拉杆螺母受力外壁,螺杆螺母内螺纹延伸至拉杆螺母受力内壁,拉杆螺母的外壁构成为圆形,在外壁上且围绕外壁的四周间隔设拉杆螺母操作槽,拉杆螺母操作槽自拉杆螺母的一端延伸至另一端。优点：保障良好的开合模效果。(A frame structure of a plastic product forming machine belongs to the technical field of plastic product forming machinery. Including a pair of pull rod and a pair of lower link, the left end and the right-hand member of a pair of pull rod and the left end and the right-hand member of a pair of lower link respectively constitute and have the pull rod external screw thread, are being furnished with pull rod nut, characteristics soon in the position corresponding to the pull rod external screw thread: establish pull rod nut inflation annular channel on the terminal surface in the pull rod nut of the one end of pull rod nut and around pull rod nut's circumferencial direction, constitute for pull rod nut atress inner wall corresponding to the wall body of the inboard of pull rod nut inflation annular channel, constitute for pull rod nut atress outer wall corresponding to the wall body in the outside of pull rod nut inflation annular channel, the screw nut internal thread extends to pull rod nut atress inner wall, pull rod nut's outer wall constitutes for circularly, establish pull rod nut operation groove on the outer wall and around the interval all around of outer wall, pull rod nut operation groove extends to the other end from pull rod nut's one end. The advantages are that: and a good die opening and closing effect is guaranteed.)

1. A frame structure of a plastic product forming machine comprises a pair of upper pull rods (1) which are parallel to each other and a pair of lower pull rods (2) which are also parallel to each other and correspond to the lower parts of the pair of upper pull rods (1), wherein pull rod external threads are respectively formed at the left end and the right end of the pair of upper pull rods (1) and the left end and the right end of the pair of lower pull rods (2), pull rod nuts (3) are screwed at positions corresponding to the pull rod external threads, the frame structure is characterized in that a pull rod nut expansion annular groove (311) sunken in the inner end surface (31) of the pull rod nut is formed on the inner end surface (31) of the pull rod nut at one inward end of the pull rod nut (3) in the use state and around the circumferential direction of the pull rod nut (3), a pull rod nut stressed inner wall body (312) corresponding to the inner side of the pull rod nut expansion annular groove (311) is formed, and the wall body corresponding to the outer side of the expansion annular groove (311) of the pull rod nut is formed into a pull rod nut stress outer wall (313), the screw nut internal thread (32) of the pull rod nut (3) extends to the pull rod nut stress inner wall (312), the outer wall of the pull rod nut (3) is formed into a circular shape, pull rod nut operation grooves (33) are formed in the outer wall and around the periphery of the outer wall at intervals, and the pull rod nut operation grooves (33) extend to the other end from one end of the pull rod nut (3).

2. The frame structure of the plastic product molding machine according to claim 1, characterized in that the inner stress wall (312) of the draw bar nut is provided with inner stress wall internal thread expansion grooves (3121) at intervals around the inner stress wall (312) of the draw bar nut, and the inner stress wall internal thread expansion grooves (3121) of the draw bar nut are communicated with the annular expansion groove (311) of the draw bar nut.

3. The frame structure of a plastic product molding machine according to claim 2, characterized in that the depth of the force-receiving inner wall internal thread expansion groove (3121) of the draw-bar nut is shallower than the draw-bar nut expansion annular groove (311).

4. Frame structure of a plastic moulding machine according to claim 1 or 2 or 3, characterized in that the width of the draw-bar nut expansion annular groove (311) is one fifth to two fifths of the wall thickness of the draw-bar nut (3), while the depth of the draw-bar nut expansion annular groove (311) is one fifth to one sixth of the length of the draw-bar nut (3).

5. The frame structure of a plastic product molding machine according to claim 3, characterized in that the depth of the internal thread expansion groove (3121) of the inner forced wall of the tie nut is one half or one third of the annular expansion groove (311) of the tie nut.

6. The frame structure of a plastic product molding machine according to claim 3 or 5, characterized in that the shape of the force-receiving inner wall internal thread expansion groove (3121) of the draw bar nut is a U-shape.

7. The frame structure of a plastic product molding machine according to claim 6, characterized in that the number of the tension rod nut forced inner wall internally threaded expansion grooves (3121) is three to eight, and the interval distance between each two adjacent tension rod nut forced inner wall internally threaded expansion grooves (3121) is equal.

8. The frame structure of a plastic molding machine according to claim 1, wherein the number of the draw-bar nut operating grooves (33) is three or six and the interval distance between each two adjacent draw-bar nut operating grooves (33) is equal.

9. The frame structure of plastic molding machine according to claim 1 or 8, characterized in that the cross-sectional shape of the draw-bar nut operating groove (33) is U-shaped or trapezoidal.

Technical Field

The invention belongs to the technical field of plastic product forming machinery, and particularly relates to a rack structure of a plastic product forming machine.

Background

The plastic articles mentioned above are mainly, but not absolutely limited to, hollow plastic articles such as various plastic containers, palletizing buckets or even trays (such as CN102407967B, CN103253442A and CN 102009774B), and so on.

As is known in the art, the plastic product molding machine needs to perform a mold opening and closing operation once for each product to be molded, and for this, reference may be made to CN101890772B (mold opening and closing mechanism), CN101890805B (magnetic mold closing device of hollow plastic product molding machine), CN102357948A (toggle mold opening and closing mechanism), CN102848558B (mold locking device of hollow plastic product molding machine), CN103522528B (horizontal mold closing mechanism for blow molding), CN103587109B (mold locking device of hollow plastic product molding machine), and CN103538244B (mold locking device structure of hollow plastic product molding machine).

Further, as is known in the art, the larger the volume of the plastic product to be molded, the larger the stroke of the oil cylinder of the structural system of the mold opening and closing mechanism, and the two mold halves (i.e., a pair of mold halves) need to be locked by a sufficient mold locking force after being clamped in place, so as to ensure the molding quality of the plastic product, otherwise there is a possibility of molding failure or mold clamping seam or flash left on the plastic product. For this, refer to the "fast mold opening and closing cylinder structure of plastic product molding machine" recommended by chinese patent CN 105909591B.

After reading the above specification of CN105909591B and combining with the common general knowledge: the structural system of the frame of the plastic product forming machine comprises a pair of upper pull rods and a pair of lower pull rods, a left oblique beam is arranged between the left ends of the pair of upper pull rods and the pair of lower pull rods, an open-close die acting cylinder (CN 105909591B called as an oil cylinder) is arranged on the left oblique beam in a horizontal state, a right oblique beam is arranged between the right ends of the pair of upper pull rods and the pair of lower pull rods, the lower part of the left oblique beam and a left oblique beam guide rail on the base of the frame form a guide rail pair, the right oblique beam and a right oblique beam guide rail on the base of the frame form a guide rail pair, a left die carrier is arranged on the right side corresponding to the left oblique beam, the lower part of the left die carrier and a pair of left die carrier guide rails on a frame base at the lower part of the frame form a guide rail pair, the left side of the left die carrier is connected with a die opening and closing acting cylinder column of the die opening and closing acting cylinder, a right die carrier is arranged on the left side corresponding to the right oblique beam, the lower part of the right die carrier and a pair of right die carrier guide rails on a frame base at the lower part of the frame form a guide rail pair. In a use state, a left half die is fixed on one side of the left die carrier facing the right die carrier, and a right half die is fixed on one side of the right die carrier facing the left die carrier. Since the specific mold opening and closing process of the left and right mold halves can be referred to in paragraph 0040 of the specification of CN105909591B, the applicant does not need to describe any further.

It can be seen from a reading of the above paragraph 0040 of the specification of CN105909591B that: the left end and the right end of the pair of upper pull rods and the left end and the right end of the pair of lower pull rods are respectively provided with a pull rod external thread, pull rod nuts (the number of the pull rod nuts is eight) are respectively screwed on the pull rod external threads, the pull rod nuts positioned at the left ends of the pair of upper pull rods and the pair of lower pull rods correspond to the left side of the left oblique beam and limit the left oblique beam, and the pull rod nuts positioned at the right ends of the pair of upper pull rods and the pair of lower pull rods correspond to the right side of the left oblique beam and limit the right oblique beam. In the process of opening and closing the die, the stress of the pull rod nut is quite large, and the pull rod nut can meet the requirement of locking the end part of the pull rod theoretically. However, since the tie rod nut screwed on the external thread of the tie rod at the end of the tie rod in the prior art including the above CN105909591B is a common internal thread nut, the tie rod nut cannot exert the locking effect of the tie rod as a whole. That is, after the conventional draw-bar nut is screwed on the external thread of the draw-bar at the end of the draw-bar, the stress is concentrated, but the peak value of the stress on the draw-bar is high, so the thread of the draw-bar nut corresponding to the stress is easily damaged, for example, the thread breaking phenomenon occurs. The locking effect of the pull rod nut on the end parts of the pair of upper pull rods and the pair of lower pull rods can affect the mold opening and closing effect, and finally the product quality is affected. It is therefore necessary to make reasonable improvements, and the solutions described below have been made in this context.

Disclosure of Invention

The invention aims to provide a frame structure of a plastic product forming machine, which is beneficial to generating excellent integral friction force between an internal thread of a pull rod nut and an external thread of the pull rod so as to ensure that the pull rod nut can reliably lock the end part of a pull rod and ensure good mould opening and closing effect.

The invention is to accomplish the task by providing a frame structure of a plastic product forming machine, which comprises a pair of upper pull rods which are parallel to each other and a pair of lower pull rods which are also parallel to each other and correspond to the lower parts of the pair of upper pull rods, wherein the left end and the right end of the pair of upper pull rods and the left end and the right end of the pair of lower pull rods are respectively provided with a pull rod external thread, and pull rod nuts are screwed and matched at the positions corresponding to the pull rod external threads, and the frame structure is characterized in that a pull rod nut expansion annular groove which is sunken in the inner end surface of the pull rod nut is arranged on the inner end surface of the pull rod nut at the inward end of the pull rod nut in the using state and surrounds the circumferential direction of the pull rod nut, the wall body corresponding to the inner side of the pull rod nut expansion annular groove is formed into a pull rod nut stress inner wall, the wall body corresponding to the outer side of the pull, the screw nut internal thread of the pull rod nut extends to the pull rod nut stress inner wall, the outer wall of the pull rod nut is circular, a pull rod nut operation groove is formed in the outer wall and around the outer wall at intervals, and the pull rod nut operation groove extends to the other end from one end of the pull rod nut.

In a specific embodiment of the invention, pull rod nut stressed inner wall internal thread expansion grooves are formed on the pull rod nut stressed inner wall and around the pull rod nut stressed inner wall at intervals, and are communicated with the pull rod nut expansion annular groove.

In another specific embodiment of the invention, the depth of the internal thread expansion groove on the force-bearing inner wall of the pull rod nut is shallower than that of the annular expansion groove of the pull rod nut.

In yet another specific embodiment of the invention, the tie nut expansion annular groove has a width of one fifth to two fifths of the wall thickness of the tie nut, and the tie nut expansion annular groove has a depth of one fifth to one sixth of the length of the tie nut.

In a further specific embodiment of the invention, the depth of the internal thread expansion groove on the force-bearing inner wall of the pull rod nut is one half or one third of the depth of the expansion annular groove of the pull rod nut.

In a further specific embodiment of the invention, the shape of the internal thread expansion groove on the stressed inner wall of the pull rod nut is U-shaped.

In a more specific embodiment of the invention, the number of the internal thread expansion grooves on the force-bearing inner wall of the pull rod nut is three to eight, and the spacing distance between every two adjacent internal thread expansion grooves on the force-bearing inner wall of the pull rod nut is equal.

In a further specific embodiment of the present invention, the number of the draw-bar nut operating grooves is three or six and the interval distance between each two adjacent draw-bar nut operating grooves is equal.

In yet a further embodiment of the present invention, the cross-sectional shape of the draw-bar nut operating slot is U-shaped or trapezoidal.

According to the technical scheme provided by the invention, as the inner end face of the pull rod nut at the inward end is provided with the pull rod nut expansion annular groove sunken in the inner end face of the pull rod nut in the using state of the pull rod nut and surrounds the circumferential direction of the pull rod nut, the wall body corresponding to the inner side of the pull rod nut expansion annular groove is formed into the pull rod nut stressed inner wall, and the wall body corresponding to the outer side of the pull rod nut expansion annular groove is formed into the pull rod nut stressed outer wall, after the pull rod nut is screwed with the pull rod outer threads at the left and right ends of the pair of upper pull rods and the pair of lower pull rods, excellent overall friction force can be generated between the pull rod nut inner threads and the pull rod outer threads, and the pull rod nut can reliably lock the ends of the pair of upper pull; because the excellent plane pressing force is generated through the expansion of the expansion annular groove of the pull rod nut, the friction force between the internal thread of the pull rod nut and the external thread of the pull rod is increased to the most appropriate degree, and the internal thread of the pull rod nut is uniformly stressed due to the comprehensive matching with the external thread of the pull rod, so that the tooth breaking condition caused by stress concentration can not occur, and the good die opening and closing effect is ensured.

Drawings

FIG. 1 is a schematic diagram illustrating an embodiment and an application of the present invention.

Fig. 2 is a detailed structural view of the draw rod nut shown in fig. 1.

Fig. 3 is an enlarged view of a portion a of fig. 1.

Detailed Description

In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are exemplified by the position state of the drawing being described, and thus, it should not be understood as a particular limitation to the technical solution provided by the present invention.

Referring to fig. 1, in fig. 1, there are shown a pair of upper tie rods 1 which are parallel to each other in a front-rear direction and a pair of lower tie rods 2 which are also parallel to each other in a front-rear direction and correspond to the lower portions of the pair of upper tie rods 1, and tie rod male threads are formed at the left and right ends of the pair of upper tie rods 1 and at the left and right ends of the pair of lower tie rods 2, respectively, and a tie rod nut 3 is screwed at a position corresponding to the tie rod male threads.

Fig. 1 also shows a left oblique beam 4 and a right oblique beam 5, the upper end of the left oblique beam 4 is arranged at the left end of the pair of upper pull rods 1, the lower end is arranged between the left ends of the pair of lower pull rods 2, the bottom of the left oblique beam 4 and a left oblique beam guide rail 61 on a frame base 6 of the structural system of the frame form a guide rail pair, the upper end of the right oblique beam 5 is arranged between the right ends of the pair of upper pull rods 1, the lower end is arranged between the right ends of the pair of lower pull rods 2, and the bottom of the right oblique beam 5 and a right oblique beam guide rail 62 on the frame base 6 of the structural system of the frame form a guide rail pair. An opening/closing cylinder 41 is provided in the left sloping beam 4 in a horizontal position, and an opening/closing cylinder column 411 of the opening/closing cylinder 41 faces rightward. A left mold frame 7 is fixed to the right side corresponding to the left oblique beam 4, the left side of the left mold frame 7 is connected to the mold opening and closing cylinder column 411, that is, the end of the mold opening and closing cylinder column 411 is connected to the left side of the left mold frame 7, and the lower part of the left mold frame 7 and a left mold frame guide rail 71 on the frame base 6 form a guide rail pair. A right die carrier 8 is arranged, namely fixed, on the left side corresponding to the right oblique beam 5, and the lower part of the right die carrier 8 and a right die carrier guide rail 81 on the frame base 6 form a guide rail pair. A left half die 72 is fixed on one side, namely the right side, of the left die carrier 7 facing the right die carrier 8, a right half die 82 is fixed on one side, namely the left side, of the right die carrier 8 facing the left die carrier 7, and the left half die 72 and the right half die 82 correspond to each other and can be replaced with different specifications according to process requirements. Since the structure described in this paragraph is substantially the same as that of CN105909591B, the difference is that the position of the mold opening and closing cylinder 41 is set on the right, and since the mold opening and closing process is described in detail in paragraph 0040 of the specification of CN105909591B, the applicant does not need to describe any further. Further, the facing displacement or the repulsion of the left and right mold frames 7, 8 can be secured by the link mechanism, and the similar structure and the mechanism of action of the link mechanism can be referred to CN101890772B, and therefore, the applicant does not give any explanation.

Please refer to fig. 2 and fig. 3, which are the technical points of the technical solutions provided by the present invention: a draw-bar nut expansion annular groove 311 recessed in the draw-bar nut inner end surface 31 (left end surface in the position state shown in fig. 2 and 3) is formed on the draw-bar nut inner end surface 31 (left end surface in the position state shown in fig. 2 and 3) of an end facing inward in the use state of the draw-bar nut 3 (i.e., the left end in the position state shown in fig. 2 and 3, which is fixed to the right ends of the pair of upper draw-bar 1 and the pair of lower draw-bar 2, and the same applies hereinafter) in the circumferential direction of the draw-bar nut 3, the wall body corresponding to the inside of the draw-bar nut expansion annular groove 311 is a draw-bar nut force receiving inner wall 312, the wall body corresponding to the outside of the draw-bar nut expansion annular groove 311 is a draw-bar nut force receiving outer wall 313, the screw nut internal thread 32 of the draw-bar nut 3 extends to the draw-bar nut force receiving inner, on the outer wall and around the periphery of the outer wall, there are provided draw bar nut operating grooves 33 at intervals, the draw bar nut operating grooves 33 extending from one end to the other end of the draw bar nut 3, for example, from the left end to the right end.

As shown in fig. 2 and 3, inner stress wall internal thread expansion grooves 3121 are formed on the inner stress wall 312 of the draw rod nut and around the inner stress wall 312 of the draw rod nut at intervals, and the inner stress wall internal thread expansion grooves 3121 of the draw rod nut communicate with the annular expansion groove 311 of the draw rod nut.

In this embodiment, the depth of the inner threaded expansion groove 3121 of the force-receiving inner wall of the draw rod nut is shallower than the annular expansion groove 311 of the draw rod nut.

In the present embodiment, the width of the tie nut expansion annular groove 311 is one fifth, but may be two fifths, of the wall thickness of the tie nut 3, and the depth of the tie nut expansion annular groove 311 is one fifth, but may be one sixth, of the length of the tie nut 3.

In this embodiment, the depth of the inner threaded expansion groove 3121 of the inner wall of the draw rod nut is one half of that of the annular expansion groove 311 of the draw rod nut, but may be one third, and the inner threaded expansion groove 3121 of the draw rod nut is U-shaped.

In this embodiment, the number of the inner forced wall internal thread expansion grooves 3121 of the aforementioned draw rod nut is preferably three to eight, preferably four to seven, and more preferably six, and the interval distance between each two adjacent inner forced wall internal thread expansion grooves 3121 of the draw rod nut is equal.

The number of the aforementioned draw-bar nut operating grooves 33 is three or six and the spacing distance between each two adjacent draw-bar nut operating grooves 33 is equal. In the present embodiment, the cross-sectional shape of the aforementioned draw-bar nut operating groove 33 is U-shaped, but may be trapezoidal.

Continuing to refer to fig. 1 to fig. 3, when the mold is closed, the mold opening and closing cylinder 41 (using an oil cylinder) works, the mold opening and closing cylinder column 411 extends outwards, i.e. extends rightwards, and pushes the left mold frame 7 together with the left mold half to move rightwards, and simultaneously the left oblique beam 4 moves leftwards and drives the right oblique beam 5 together with the right mold frame 8 and the right mold half 82 to move leftwards through the pair of upper and lower pull rods 1 and 2, so that the left and right mold halves 72 and 82 are closed, and vice versa. In the foregoing process, the draw-bar nut 3 has a very excellent locking force, and particularly, since the thread of the portion corresponding to the stressed inner wall 312 of the draw-bar nut is in the expansion annular groove 311 of the draw-bar nut, the force applied to the draw-bar nut 3 can be distributed to the internal threads 32 of the draw-bar nut at the middle and right ends of the draw-bar nut 3, the draw-bar nut 3 integrally exhibits an ideal locking force for the external threads of the draw-bar, and the phenomenon of tooth breakage does not occur.

In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.