A locking nut device for injection molding machine mold plate locking

Abstract

The utility model discloses a lock tooth nut device for injection molding machine template locking belongs to injection molding machine die clamping device technical field. It includes two mutually parallel setting pull rod and self locking nut subassembly, and the middle part of pull rod is equipped with the guide section of sliding cooperation with movable template, and the both ends of pull rod are equipped with the assembly section for installing rear template and front template, the assembly section includes the locating shaft shoulder of setting in the outside of guide section, the positive thread section of setting in the outside of locating shaft shoulder, the transition shaft shoulder of setting in the outside of positive thread section and the reverse thread section of setting in the outside of transition shaft shoulder, and the self locking nut subassembly includes elastic gasket, and the positive nut of being matched with positive thread section, the reverse nut of being matched with reverse thread section and the locating bolt of connecting positive nut and reverse nut. The utility model discloses a lock tooth nut device for injection molding machine template locking, which is reasonable in structure, has template self locking effect and can be used for injection molding machine template locking.

Description

Technical Field

[0001] This utility model mainly relates to the technical field of injection molding machine mold clamping device, and specifically refers to a locking nut device for locking the mold plate of an injection molding machine. Background Technology

[0002] Injection molding machines utilize plastic molds to create various shapes of plastic products from thermoplastic or thermosetting plastics, thus enjoying widespread application. The mold clamping device, as a core component of the injection molding machine, must possess sufficient operational stability. However, during operation, the mold clamping device is subjected to mold expansion forces and vibrations, causing the front and rear mold plates to tend to move away from each other. In existing technology, the front and rear mold plates are respectively mounted at both ends of a tie rod and locked with nuts. While this technology achieves the connection between the front and rear mold plates, the locking nuts, under the influence of mold expansion forces and vibrations, frequently experience thread slippage and rotation, leading to a gradual increase in the distance between the front and rear mold plates. This significantly reduces the quality of mold clamping. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in view of the technical problems existing in the prior art, this utility model provides a locking nut device with reasonable structure, self-locking effect of template, and can be used for locking the template of injection molding machine.

[0004] To solve the above problems, the solution proposed by this utility model is: a locking nut device for locking the template of an injection molding machine, comprising two parallel pull rods; each pull rod includes a guide section that slides with the moving template, and assembly sections located on the left and right sides of the guide section for installing the rear template and the front template; the assembly section includes a positioning shoulder disposed on the outside of the guide section, a forward threaded section disposed on the outside of the positioning shoulder, a transition shoulder disposed on the outside of the forward threaded section, and a reverse threaded section disposed on the outside of the transition shoulder.

[0005] This utility model also includes a self-locking nut assembly detachably mounted on the assembly section for axially locking the rear template and the front template; the self-locking nut assembly includes an elastic washer mounted on the outside of the rear template and the front template, a forward nut adapted to the forward thread section, a reverse nut adapted to the reverse thread section, and a positioning bolt that smoothly passes through the reverse nut and is threadedly connected to the forward nut; the outer diameter of the threaded section on the positioning bolt is smaller than the outer diameter of its smooth section.

[0006] The direction of the thread on the forward thread segment is opposite to the direction of the thread on the reverse thread segment.

[0007] Furthermore, the forward threaded section is provided with a right-hand external thread, and the forward nut is provided with a right-hand internal thread adapted to the right-hand external thread; the reverse threaded section is provided with a left-hand external thread, and the reverse nut is provided with a left-hand internal thread adapted to the left-hand external thread.

[0008] Furthermore, the forward threaded section is provided with a left-hand external thread, and the forward nut is provided with a left-hand internal thread adapted to the left-hand external thread; the reverse threaded section is provided with a right-hand external thread, and the reverse nut is provided with a right-hand internal thread adapted to the right-hand external thread.

[0009] Furthermore, the reverse nut has a smooth through hole along the thickness direction that is clearance-fitted with the positioning bolt, and the forward nut has a threaded through hole along the thickness direction that is adapted to the positioning bolt.

[0010] Furthermore, the number of positioning bolts is not less than two.

[0011] Furthermore, the outer diameter of the transition shoulder is smaller than the thread diameter of the positive thread section.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects: The locking nut device for locking the mold plate of an injection molding machine includes an assembly section and a self-locking nut assembly. The forward thread section and the reverse thread section on the assembly section have opposite thread directions. During operation, the mold clamping device of the injection molding machine is subjected to mold expansion force and vibration, causing the rear and front mold plates to tend to move away from each other. The forward and reverse nuts have a tendency to unwind, meaning the forward and reverse nuts in the same self-locking nut assembly have opposite rotational tendencies. However, the positioning bolt in the self-locking nut assembly makes the forward and reverse nuts form a "quasi-rigid body," meaning they have the same rotational tendency. These two contradictory rotational tendencies prevent the forward and reverse nuts from rotating. Thus, the self-locking nut assembly and the assembly section work together to achieve the technical effect of self-locking the rear and front mold plates. Therefore, this utility model is a locking nut device with a reasonable structure, a mold plate self-locking effect, and can be used for locking the mold plate of an injection molding machine. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the structural principle of a locking nut device for locking the template of an injection molding machine, according to this utility model.

[0014] Figure 2 This is a schematic diagram of the tie rod structure of this utility model.

[0015] Figure 3 yes Figure 1 Enlarged view of the local structure of section I.

[0016] In the diagram, 11—rear template; 12—moving template; 121—drive rod; 13—front template; 2—pull rod; 20—guide section; 21—assembly section; 211—positioning shoulder; 212—forward thread section; 213—transition shoulder; 214—reverse thread section; 3—nut assembly; 31—elastic washer; 32—forward nut; 33—reverse nut; 34—positioning bolt. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] See Figures 1 to 3 This utility model discloses a locking nut device for locking the template of an injection molding machine. It includes two parallel pull rods 2. Each pull rod 2 includes a guide section 20 that slides with the moving template 12, and assembly sections 21 located on the left and right sides of the guide section 20 for installing the rear template 11 and the front template 13. The assembly sections 21 include a positioning shoulder 211 located outside the guide section 20, a forward threaded section 212 located outside the positioning shoulder 211, a transition shoulder 213 located outside the forward threaded section 212, and a reverse threaded section 214 located outside the transition shoulder 213. Preferably, the outer diameter of the transition shoulder 213 is smaller than the thread diameter of the forward threaded section 212. In specific implementation, the rear template 11 is detachably connected to the mold frame of the injection molding machine. The moving template 12 is provided with a drive rod 121. The left end of the drive rod 121 passes through the rear template 11 and extends outward. The moving template 12 and the guide section 20 of the pull rod 2 are clearance fit. In order to facilitate the inner positioning of the rear template 11 and the front template 13, the outer diameter of the guide section 20 is larger than the maximum outer diameter of the assembly section 21. The rear template 11 and the front template 13 are both provided with positioning through holes along the thickness direction that are adapted to the outer diameter of the positioning shoulder 211, and the width of the positioning shoulder 211 is slightly smaller than the thickness of the rear template 11 and the front template 13. The transition shoulder 213 is provided to facilitate the disassembly and installation of the self-locking nut assembly 3 and to facilitate the replacement of the rear template 11 and the front template 13.

[0019] See Figure 3This utility model also includes a self-locking nut assembly 3 detachably mounted on the assembly section 21 for axially locking the rear template 11 and the front template 13. The self-locking nut assembly 3 includes an elastic washer 31 mounted on the outside of the rear template 11 and the front template 13, a forward nut 32 adapted to the forward thread section 212, a reverse nut 33 adapted to the reverse thread section 214, and a positioning bolt 34 smoothly passing through the reverse nut 33 and threadedly connected to the forward nut 32. The outer diameter of the threaded section of the positioning bolt 34 is smaller than the outer diameter of its smooth section. Preferably, the reverse nut 33 has a smooth through hole along its thickness direction that is clearance-fitted with the positioning bolt 34, and the forward nut 32 has a threaded through hole along its thickness direction that is adapted to the positioning bolt 34. The number of positioning bolts 34 is not less than two. In specific implementation, the rear template 11 and the front template 13 are respectively fitted onto the positioning shoulders 211 on the left and right sides of the tie rod 2. The elastic washer 31 is fitted onto the assembly section 21, close to the rear template 11 and the front template 13. The forward nut 32 is screwed onto the forward thread section 212, applying sufficient pressure to the elastic washer 31. In embodiment one, there are two positioning bolts 34, which are symmetrically arranged about the axis of the tie rod 2. In embodiment two, there are three positioning bolts 34, which are symmetrically arranged about the axis of the tie rod 2. In specific application, the forward nut 32 needs to be tightened to cause a certain elastic deformation of the elastic washer 31. The reverse nut 33 does not need to be tightened on the reverse thread section 214, but it is necessary to ensure that the smooth through hole on the reverse nut 33 is coaxial with the threaded through hole of the forward nut 32, so that the positioning bolt 34 can spiral into the threaded through hole after passing through the smooth through hole. After the forward nut 32 and the reverse nut 33 are connected by the positioning bolt 34, they form a "quasi-rigid body", meaning that the forward nut 32 and the reverse nut 33 cannot rotate in opposite directions, but are only allowed to rotate synchronously in the same direction.

[0020] The thread direction on the forward thread section 212 is opposite to that on the reverse thread section 214. Specifically, in Embodiment 1, the forward thread section 212 has a right-hand external thread, and the forward nut 32 has a right-hand internal thread that matches the right-hand external thread; the reverse thread section 214 has a left-hand external thread, and the reverse nut 33 has a left-hand internal thread that matches the left-hand external thread. In Embodiment 2, the forward thread section 212 has a left-hand external thread, and the forward nut 32 has a left-hand internal thread that matches the left-hand external thread; the reverse thread section 214 has a right-hand external thread, and the reverse nut 33 has a right-hand internal thread that matches the right-hand external thread.

[0021] The assembly process of this utility model is as follows: First, the moving template 12 with the drive rod 121 is slidably sleeved on the guide section 20 of the pull rod 2. Then, the rear template 11 and the front template 13 are respectively sleeved on the positioning shoulders 211 at both ends of the pull rod 2. Finally, the self-locking nut assembly 3 is installed on the outside of the rear template 11 and the front template 13. When installing the self-locking nut assembly 3, first, fit the elastic washer 31 tightly against the rear template 11 and the front template 13 onto the forward thread section 212. Then, tighten the forward nut 32 onto the forward thread section 212. During the tightening process, use external force to straighten the elastic washer 31 to ensure that the inner ring of the elastic washer 31 does not touch the outer thread of the forward thread section 212. After tightening the forward nut 32, screw the reverse nut 33 into the reverse thread section 214. At this time, the reverse nut 33 does not need to be tightened, but the smooth through hole on the reverse nut 33 should be coaxial with the threaded through hole of the forward nut 32. Finally, pass the positioning bolt 34 through the smooth through hole on the reverse nut 33 and screw it into the threaded through hole of the forward nut 32.

[0022] The working principle of the self-locking nut assembly 3 of this utility model is as follows: During the operation of the injection molding machine's mold clamping device, it is subjected to mold expansion force and vibration. The rear mold plate 11 and the front mold plate 13 tend to move away from each other, that is, the forward nut 32 and the reverse nut 33 tend to unwind. Since the threads of the forward thread section 212 and the reverse thread section 213 on the assembly section 21 are opposite in direction, the forward nut 32 and the reverse nut 33 in the same self-locking nut assembly 3 have a rotational tendency with opposite directions of rotation. However, the connection of the positioning bolt 34 makes the forward nut 32 and the reverse nut 33 in the same self-locking nut assembly 3 form a "quasi-rigid body", that is, the forward nut 32 and the reverse nut 33 in the same self-locking nut assembly 3 have a rotational tendency with the same direction of rotation. Therefore, the forward nut 32 and the reverse nut 33 will not rotate and unwind under the action of mold expansion force and vibration. That is, the assembly section 21 and the self-locking nut assembly 3 work together to achieve the self-locking effect on the rear mold plate 11 and the front mold plate 13.

[0023] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without creative effort should fall within the protection scope of this utility model.

Claims

1. A locking nut device for locking the template of an injection molding machine, comprising two parallel tie rods (2); characterized in that, The tie rod (2) includes a guide section (20) that slides with the moving template (12), and an assembly section (21) located on the left and right sides of the guide section (20) for installing the rear template (11) and the front template (13); the assembly section (21) includes a positioning shoulder (211) located outside the guide section (20), a forward threaded section (212) located outside the positioning shoulder (211), a transition shoulder (213) located outside the forward threaded section (212), and a reverse threaded section (214) located outside the transition shoulder (213). It also includes a self-locking nut assembly (3) detachably mounted on the assembly section (21) for axially locking the rear template (11) and the front template (13); the self-locking nut assembly (3) includes an elastic washer (31) mounted on the outside of the rear template (11) and the front template (13), a forward nut (32) adapted to the forward thread section (212), a reverse nut (33) adapted to the reverse thread section (214), and a positioning bolt (34) that smoothly passes through the reverse nut (33) and is threadedly connected to the forward nut (32); the outer diameter of the threaded section of the positioning bolt (34) is smaller than the outer diameter of its smooth section; The direction of the thread on the forward thread section (212) is opposite to the direction of the thread on the reverse thread section (214).

2. The locking nut device for locking the template of an injection molding machine according to claim 1, characterized in that, The forward thread section (212) is provided with a right-hand external thread, and the forward nut (32) is provided with a right-hand internal thread that matches the right-hand external thread; the reverse thread section (214) is provided with a left-hand external thread, and the reverse nut (33) is provided with a left-hand internal thread that matches the left-hand external thread.

3. A locking nut device for locking the template of an injection molding machine according to claim 1, characterized in that, The forward thread section (212) is provided with a left-hand external thread, and the forward nut (32) is provided with a left-hand internal thread that matches the left-hand external thread; the reverse thread section (214) is provided with a right-hand external thread, and the reverse nut (33) is provided with a right-hand internal thread that matches the right-hand external thread.

4. A locking nut device for locking the template of an injection molding machine according to claim 1, characterized in that, The reverse nut (33) has a smooth through hole along the thickness direction that is clearance-fitted with the positioning bolt (34), and the forward nut (32) has a threaded through hole along the thickness direction that is adapted to the positioning bolt (34).

5. A locking nut device for locking the template of an injection molding machine according to claim 4, characterized in that, The number of the positioning bolts (34) shall not be less than two.

6. A locking nut device for locking the template of an injection molding machine according to claim 1, characterized in that, The outer diameter of the transition shoulder (213) is smaller than the thread diameter of the forward thread section (212).

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