Anti-loosening pull rod

Abstract

An anti-loosening pull rod comprises a rod body, a locking thread is arranged on the surface of the rod body, key grooves capable of being connected with limiting keys in an inserted mode are distributed in the surface, provided with the locking thread, of the rod body at intervals, the key grooves are formed in the axial direction of the rod body, and one end of each key groove extends out of the end face of the locking thread. The nut has the advantages that the key grooves in which the limiting keys can be inserted are distributed in the surface of the rod body provided with the locking threads at intervals, the key grooves are formed in the axial direction of the rod body, one ends of the key grooves extend out of the end face of the locking threads, the limiting keys are convenient to install, the nut and the rod body can be fully fixed after installation, the locking effect is good, and the service life is long. According to the structure, interference fit between the threads of the nut and the threads of the pull rod is not needed, and the service life of the pull rod and the nut is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of injection molding machine pull rod technical field, especially to a kind of anti-loose pull rod. BACKGROUND

[0002] A kind of injection molding machine pull rod mechanism is disclosed in the Chinese utility model patent application with the application No.CN201320831845.6 and the name of the injection molding machine pull rod mechanism, including injection molding machine head template, pull rod and nut, pull rod passes through head template and is fixed by nut, the pull rod of the application includes threaded section, support shaft section, the nut includes internal thread, support section, when the threaded section formed when the nut is fixed with the pull rod is screwed, support shaft section and support section clearance fit form support section.The utility model protects pull rod threaded section by the radial constraint of support section on the nut to the pull rod support shaft section, to avoid the bending of pull rod threaded section;And using the positioning cooperation of support section and support shaft, the bending of pull rod threaded section is obviously protected.Using the positioning cooperation of injection molding machine head template pull rod hole orifice support and pull rod nut outer support shaft section, the influence of annular surface stress when template deformation is weakened, threaded section is indirectly protected.Also set unloading groove, the position of pull rod bending is flexible and controllable.However, the pull rod mechanism still needs to be screwed, and it is easy to slip silk and demould after being used for several times, so the structure of the pull rod mechanism still needs to be further improved. SUMMARY

[0003] The utility model provides a kind of anti-loose pull rod with high locking efficiency and good effect for the above-mentioned prior art status.

[0004] The technical scheme adopted by the utility model to solve the above technical problems is as follows: the anti-loose pull rod includes a rod body, a locking thread is arranged on the surface of the rod body, and the rod body surface where the locking thread is arranged is intermittently provided with a key groove capable of inserting a limiting key, the key groove is arranged along the axial direction of the rod body, and one end of the key groove extends beyond the end face of the locking thread.

[0005] As an improvement, the key groove can be a waist-shaped groove.

[0006] Further improvement, the length of the key groove can be preferably greater than one half of the length of the locking thread.

[0007] Further improvement, the length of the locking thread can be preferably greater than one half of the length of the rod body.

[0008] As an improvement, the key groove can preferably have four, and the four key grooves can be preferably equally spaced on the surface of the rod body.

[0009] As an improvement, a patterned protrusion capable of being buckled with a fixing frame of an injection molding machine to prevent the rod body from rotating can be preferably arranged at the end of the rod body.

[0010] Further improvement, the flower-shaped protrusion can be preferably made integrally with the rod body.

[0011] Further improvement, the rod body between the flower-shaped protrusion and the locking thread can be preferably provided with a top contact boss capable of preventing the limiting key and the nut from loosening.

[0012] Further improvement, the surface of the top contact boss can be preferably provided with an annular protruding part capable of preventing stress concentration.

[0013] Further improvement, the end face of the top contact boss can be preferably a slope capable of preventing impact.

[0014] Compared with the prior art, the utility model has the advantages that the key groove capable of inserting the limiting key is distributed on the rod body surface with the locking thread, the key groove is arranged along the rod body axial direction, one end of the key groove extends the end face of the locking thread, the limiting key is convenient to install, can be fully fixed after installation, and the locking effect is good, the structure does not need to use the thread of the nut and the thread of the pull rod interference fit again, prolongs the service life of the pull rod and the nut. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the perspective view of the utility model embodiment;

[0016] Figure 2 It is the front projection view of Figure 1 ; It is the side view of

[0017] Figure 3 It is the enlarged view of I part in Figure 2 ; It is the sectional view of CONCRETE EMBODIMENT

[0018] The utility model will be further described in detail below in combination with the drawings.

[0019] As shown in Figures 1 to 3 , the anti-loose pull rod of the embodiment comprises a rod body 1, the rod body 1 is provided with locking thread 11 on the surface, the rod body surface with the locking thread 11 is distributed with the key groove 12 capable of inserting the limiting key at intervals, the key groove 12 is arranged along the rod body 1 axial direction, one end of the key groove 12 extends the end face of the locking thread 11. The key groove 12 is a waist-shaped groove. The length of the key groove 12 is greater than one half of the length of the locking thread 11. The length of the locking thread 11 is greater than one half of the length of the rod body 1. The key groove 12 has four, and the four key grooves are equally spaced on the rod body surface.

[0020] A patterned protrusion 13 is arranged at the end of the rod body 1, which can be buckled with the fixing frame of the injection molding machine to prevent the rotation of the rod body 1. The patterned protrusion 13 is integrally made with the rod body 1. A top-touch boss 14 capable of preventing the loosening of the limiting key and the nut is arranged on the rod body 1 between the patterned protrusion 13 and the locking thread 11. An annular protrusion part 141 capable of preventing stress concentration is arranged on the surface of the top-touch boss 14. The end face of the top-touch boss 14 is a slope 142 capable of preventing impact.

Claims

1. A self-locking tension rod comprising a rod body (1) having a locking thread (11) provided on the surface of the rod body (1), characterized in that: The key groove (12) is provided on the surface of the rod body (1) at intervals and is capable of inserting a limiting key. The key groove (12) is provided axially along the rod body (1) and extends from one end of the locking screw (11).

2. The safety rod of claim 1, wherein: The key groove (12) is a waist-shaped groove.

3. The safety rod of claim 2, wherein: The length of the key groove (12) is greater than one half of the length of the locking screw (11).

4. The keep-froo pull rod of claim 3, wherein: The length of the locking screw (11) is greater than one half of the length of the rod body (1).

5. A captive pull rod according to any one of claims 1 to 4, wherein: The key groove (12) has four key grooves which are equally spaced on the surface of the rod body (1).

6. A captive pull rod according to any one of claims 1 to 4, wherein: A patterned protrusion (13) is provided on the end of the rod body (1) and is capable of being buckled with the fixing frame of the injection molding machine to prevent the rotation of the rod body (1).

7. The keep-froo pull rod of claim 6, wherein: The patterned protrusion (13) is integrally formed with the rod body (1).

8. The keep-froo pull rod of claim 6, wherein: A top contact boss (14) is provided on the rod body (1) between the patterned protrusion (13) and the locking screw (11) and is capable of preventing the loosening of the limiting key and the nut.

9. The keep-froo pull rod of claim 8, wherein: An annular protrusion (141) is provided on the surface of the top contact boss (14) and is capable of preventing stress concentration.

10. The keep-froo pull rod of claim 8, wherein: The end surface of the top contact boss (14) is a bevel (142) which is capable of preventing impact.

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