CN210552840U

CN210552840U - Injection molding machine pull rod assembly

Info

Publication number: CN210552840U
Application number: CN201921517891.2U
Authority: CN
Inventors: 阮元志
Original assignee: Guangdong Shunde Nuoen Industrial Technology Co ltd
Current assignee: Guangdong Shunde Nuoen Industrial Technology Co ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-05-19
Anticipated expiration: 2029-09-11

Abstract

The utility model discloses an injection molding machine draw bar assembly, its stress ring tooth section that includes the pull rod body, locates pull rod body middle part, cut apart into at least two halves and the concatenation is encircled along the axial the internal tooth ring body, the cover of stress ring tooth section are located the piston body of internal tooth ring body, the piston body has and compresses tightly the interior convex ring platform of internal tooth ring body terminal surface, the internal tooth ring body have annular internal tooth and with the outer loop tooth cooperation of stress ring tooth section is connected. The piston is connected with the stressed ring tooth section in a matched mode through the concave-convex inner ring teeth and the concave-convex outer ring teeth, the ring teeth serve as stressed parts, the stress of the connected parts is dispersed and balanced in the axial direction due to the stress of the multiple rings of ring teeth, stress concentration caused by overlarge local stress is avoided, and therefore the pull rod is prevented from being broken. Therefore, the connection relation between the piston and the pull rod body is stable and the stress is balanced, and the matching precision and the durability of the pull rod assembly are improved.

Description

Injection molding machine pull rod assembly

Technical Field

The utility model relates to an injection molding machine field especially relates to a take injection molding machine draw bar assembly of piston.

Background

The injection molding machine draw bar is also called a mold locking piston rod and a tie bar, and is an accessory component for guiding a movable mold plate and locking the movable mold plate and a fixed mold plate by the injection molding machine.

Referring to fig. 1, a conventional tie rod of an injection molding machine includes a tie rod body 11, an annular boss 12 for supporting a shoulder structure of a piston 13 is provided on the tie rod body 11, and a piston supporting surface is formed at one end surface of the annular boss 12. The piston support surface is a conical surface 14, and the conical surface 14 forms a certain angle with the central axis L of the pull rod body 11. The pull rod body 11 is close to conical surface 14 department is piston installation section 16, and the periphery of piston installation section 16 is equipped with annular groove 18 and external screw thread 15, is equipped with sealing washer 19 in the annular groove 18, and external screw thread 15 is connected with piston 13 and nut 17, and piston 13 cover is established outside piston installation section 16, and piston 13 compresses tightly to be connected on the conical surface 14 and between the nut 17, passes through between piston 13 inner wall and the pull rod body 11 sealing washer 19 is sealed. One end of the pull rod body 11, which is back to the conical surface 14, is used for being connected with a rear plate of the injection molding machine, and one end of the pull rod body 11, which is facing to the conical surface, is used for being connected with a fixed template of the injection molding machine, which is not shown in the figure.

Because the conical surface 14 of the piston 13 contacting the annular boss 12 forms a certain angle with the central axis L of the pull rod body 11, stress concentration is easily formed at the connection E of the pull rod body 11 and the conical surface 14, and when the piston 13 moves in the direction of the arrow D, the connection E of the conical surface 14 and the pull rod body 11 is easily broken by the acting force F. Meanwhile, the movable die plate slightly deforms when the die is closed, the pull rod body and the piston can be pressed to generate bending deformation when the die is closed, stress on all the circumferential parts of the ring surface of the conical surface is unbalanced, the high-frequency injection molding process enables the pull rod to frequently and locally bear the stress exceeding the limit, and therefore the root of the conical surface of the pull rod is cracked to cause the breakage of the pull rod. The breakage of the pull rod inevitably causes the production to be interrupted, and huge economic loss is caused to users.

In addition, because the conical surface 14 is the contact surface between the pull rod body 11 and the piston 13, the pull rod body and the piston are frequently deformed due to the high-frequency injection molding rhythm, and the piston is jumped and generates noise due to the insufficient matching precision of the contact surface, so that the requirements on the processing precision are high, the difficulty coefficient is large, and the cost is high.

Disclosure of Invention

Not enough to prior art, the to-be-solved technical problem of the utility model is to provide a atress dispersion and thereby balanced injection molding machine draw bar assembly who improves cooperation precision and durability.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides an injection molding machine pull rod assembly, its includes the pull rod body, locate the stress ring tooth section at pull rod body middle part, along the axial split into at least two halves and the concatenation encircles the internal tooth ring body of stress ring tooth section, the cover is located the piston body of internal tooth ring body, the piston body has the interior convex ring platform that compresses tightly an end face of internal tooth ring body, internal tooth ring body have annular internal tooth and with the outer ring tooth cooperation of stress ring tooth section is connected.

As an improvement of the technical proposal of the injection molding machine draw bar component, the outer peripheral surface of the piston body is provided with an annular groove and a sealing ring; the inner wall surface of the inner convex ring platform is connected with the pull rod body in a sealing mode through a sealing ring.

As the utility model discloses injection molding machine draw bar assembly's technical scheme's a improvement, the pull rod body is equipped with the stopping nut who compresses tightly piston body and internal tooth ring body, the pull rod body be equipped with the screw thread of stopping nut adaptation.

As an improvement of the technical scheme of the injection molding machine draw bar assembly, the internal tooth ring body comprises two halves or trilateral arc internal tooth split bodies formed by axial and radial cutting.

As an improvement of the technical proposal of the injection molding machine draw bar component, each internal tooth is provided with a positioning pin between the split bodies to limit the axial position of each other.

As an improvement of the technical proposal of the injection molding machine draw bar component, the radian of each internal tooth split body is equal.

As an improvement of the technical scheme of the injection molding machine draw bar assembly, the stress ring gear section and the internal tooth ring body are provided with at least three ring gears.

As an improvement of the technical scheme of the injection molding machine pull rod assembly, an air gap spiral groove is arranged between the piston body and the inner tooth ring body.

The beneficial effects of the utility model reside in that: the piston is connected with the stressed ring tooth section in a matched mode through the concave-convex inner ring teeth and the concave-convex outer ring teeth, the ring teeth serve as stressed parts, the stress of the connected parts is dispersed and balanced in the axial direction due to the stress of the multiple rings of ring teeth, stress concentration caused by overlarge local stress is avoided, and therefore the pull rod is prevented from being broken. The internal tooth ring body divide into two parts amalgamation of run from opposite directions alright encircle the cooperation atress ring tooth section, thereby reuse piston body cover internal tooth ring body and piston body establish the interior convex ring platform and compress tightly the terminal surface that the internal tooth ring body corresponds and improve connection structure's stability, avoid the high frequency to actuate and the deformation that arouses leads to the piston slip pine to take off. Therefore, the connection relation between the piston and the pull rod body is stable and the stress is balanced, and the matching precision and the durability of the pull rod assembly are improved.

Drawings

Fig. 1 is a partial structural schematic view of a conventional tie rod assembly of an injection molding machine.

Fig. 2 is a schematic sectional view of a partial structure of a tie rod assembly of an injection molding machine according to an embodiment of the present invention.

Fig. 3 is a schematic sectional view of the tie rod assembly of the injection molding machine shown in fig. 2 in an exploded state.

Fig. 4 is a schematic view of a single rod structure in an embodiment of a tie rod assembly of an injection molding machine of the present invention.

Detailed Description

The following describes the present invention with reference to the accompanying drawings.

As shown in fig. 2, fig. 3 and fig. 4, the utility model relates to an injection molding machine draw bar assembly, it includes the pull rod body 21, locate the atress ring tooth section 22 at pull rod body middle part, split into at least two halves and the concatenation is encircled along the axial internal tooth ring body 33, the cover of atress ring tooth section are located the piston body 31 of internal tooth ring body 33, piston body 31 has and compresses tightly the interior convex ring platform 32 of internal tooth ring body 33 terminal surface, internal tooth ring body 33 have annular internal tooth 35 and with the cooperation of the outer ring tooth 23 of atress ring tooth section 22 is connected. The piston body 31 and the stressed ring tooth section 22 are connected in a matched mode through the concave-convex inner ring tooth and the concave-convex outer ring tooth, the ring teeth serve as stressed positions, the stress of the connected positions is dispersed and balanced in the axial direction due to the stress of the multiple rings of ring teeth, stress concentration caused by overlarge local stress is avoided, and therefore the pull rod is prevented from being broken. The internal tooth ring body 33 is divided into two split parts, and the split parts can be in encircling fit with the stress ring tooth section 22, the internal tooth ring body 33 is sleeved with the piston body 31, the piston body 31 is provided with the internal convex ring platform 32 to compress one end face corresponding to the internal tooth ring body 33, so that the stability of the connecting structure is improved, and the sliding and loosening of the piston caused by the loosening force generated by the deformation caused by high-frequency actuation on the piston are avoided. Therefore, the connection relationship between the piston body 31 and the pull rod body 21 is stable and the stress is balanced, thereby improving the fitting precision and the durability of the pull rod assembly.

Wherein, the outer peripheral surface of the piston body 31 is provided with a ring groove and is provided with a sealing ring 36; the inner wall surface of the inner convex ring platform 32 is hermetically connected with the pull rod body 21 through the sealing ring 25, so that the piston body 31 and the pull rod body 21 form a piston and piston rod combined structure.

Further, the pull rod body 21 is provided with a retaining nut 26 for pressing the piston body 31 and the internal gear ring body 33, and the pull rod body 21 is provided with a thread section 28 matched with the retaining nut 26, so that the piston body 31 is prevented from independently retreating during pressure relief. The top diameter of the thread is smaller than the inner diameter of the inner boss 32, facilitating the installation of the piston body 31.

More preferably, as shown in fig. 3, the internally toothed ring body 33 includes two-half or three-side arc-shaped internally toothed segments 38 that are cut axially and radially to embrace the forced ring tooth segments from a lateral split and can be disassembled from both sides for replacement.

Positioning pins 39 are arranged among the internal tooth split bodies 38 to limit the axial positions of the internal tooth split bodies, the positioning pins 39 are positioned on the splicing surfaces and are perpendicular to the splicing surfaces, and the internal tooth split bodies 38 are spliced together and oriented to avoid axial dislocation of the internal tooth split bodies. This arrangement is suitable for both halves of the internal gear ring structure. The structure of three internal tooth components is more suitable to use a radial key positioning structure.

Preferably, the radians of the internal tooth split bodies 38 are equal, so that the internal tooth split bodies are convenient to manufacture, maintain and replace.

In order to distribute the force sufficiently and to have sufficient strength, the force-bearing ring tooth segments 22 and the internally toothed ring body 33 each have at least three ring teeth.

In order to facilitate the disassembly and assembly, an air gap spiral groove (not shown) is arranged between the piston body 31 and the inner tooth ring body 33, and can play a role in lubrication and air exhaust. The edge of the opening of the inner cylinder of the piston body 31 is provided with a guide angle 37, which is further convenient for the installation of the piston body 31 and the inner tooth ring body 33.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.

Claims

1. The utility model provides an injection molding machine draw bar assembly which characterized in that: the novel tension rod comprises a tension rod body, a stress ring tooth section arranged in the middle of the tension rod body, an internal tooth ring body which is divided into at least two halves along the axial direction and is spliced to encircle the stress ring tooth section, and a piston body which is sleeved on the internal tooth ring body, wherein the piston body is provided with an internal convex ring platform which compresses one end surface of the internal tooth ring body, and the internal tooth ring body is provided with annular internal teeth and is connected with external ring teeth of the stress ring tooth section in a matched mode.

2. The injection molding machine tie assembly of claim 1, wherein: the outer peripheral surface of the piston body is provided with a ring groove and a sealing ring; the inner wall surface of the inner convex ring platform is connected with the pull rod body in a sealing mode through a sealing ring.

3. The injection molding machine tie assembly of claim 1, wherein: the pull rod body is provided with a retaining nut for compressing the piston body and the inner tooth ring body, and the pull rod body is provided with threads matched with the retaining nut.

4. The injection molding machine tie assembly of claim 1, wherein: the internally toothed ring body includes two halves or three-sided arc-shaped internally toothed segments that are cut axially and radially.

5. The injection molding machine tie assembly of claim 4, wherein: positioning pins are arranged between the inner tooth split bodies to limit the axial positions of the inner tooth split bodies.

6. The injection molding machine tie assembly of claim 4, wherein: the radian of each internal tooth split body is equal.

7. The injection molding machine tie assembly of claim 1, wherein: the stress ring gear section and the internal gear ring body are provided with at least three ring teeth.

8. The injection molding machine tie assembly of claim 1, wherein: an air gap spiral groove is formed between the piston body and the inner tooth ring body.