Pull rod combination used on injection molding machine

Abstract

According to the technical scheme, the pull rod combination used on the injection molding machine is characterized in that the pull rod combination comprises a rod body, external threads are formed in the two ends of the rod body, nuts are connected to the two ends of the rod body, and a positioning shoulder protruding outwards is arranged at one end of the rod body; a sliding hole is formed in the side face of the other end of the rod body, a positioning block slides in the sliding hole, and the sliding hole is provided with an elastic piece for ejecting out the positioning block; a connecting hole communicated with the sliding hole is formed in the end part of the other end of the rod body, the connecting hole is in threaded connection with a blocking rod, and a pull rope is arranged between the blocking rod and the positioning block; when the plugging rod is screwed into the connecting hole, the positioning block protrudes out of the side face of the rod body, and the positioning shoulder is matched with the movable positioning block, so that the template and the pull rod can be quickly positioned and installed.

Description

Technical Field

[0001] This utility model relates to a component of an injection molding machine, and more specifically, to a tie rod assembly used on an injection molding machine. Background Technology

[0002] The tie rod is a key component of a horizontal injection molding machine. For example, in the prior art, Chinese patent document CN207224524U, entitled "A Horizontal Injection Molding Machine," is cited. (See attached document for details.) Figure 1 Four tie rods 24 are used to fix the rear template 21 and the front template 23, and the movable template 22 slides on the tie rods 24;

[0003] In current injection molding machines, when installing tie rods on the rear and front mold plates, the tie rods are typically threaded at both ends, and two nuts are used to clamp each mold plate. However, this installation method has drawbacks. Each time the tie rod is installed, the nuts need to be screwed into the tie rod and their position measured before the mold plate is installed. Furthermore, due to the large size of the tie rod, it is assembled using a hoisting method. During hoisting, the tie rod may collide with the mold plate, causing the nuts to shift. In practice, the nut positioning needs constant adjustment, making the positioning and installation of the mold plates and tie rods at both ends very inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide a tie rod assembly for use on an injection molding machine, which uses a positioning shoulder and a movable positioning block to enable the template and tie rod to be quickly positioned and installed.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A tie rod assembly used on an injection molding machine includes a rod body with external threads at both ends, nuts connected to both ends of the rod body, and a locating shoulder protruding outward at one end of the rod body; a sliding hole is provided on the side of the other end of the rod body, a locating block slides in the sliding hole, and an elastic element is provided in the sliding hole to eject the locating block; a connecting hole is provided at the end of the other end of the rod body, communicating with the sliding hole, a plug rod is threadedly connected to the connecting hole, and a pull rope is provided between the plug rod and the locating block; when the plug rod is screwed into the bottom of the connecting hole, the locating block protrudes from the side of the rod body.

[0007] Preferably, the upper surface of the positioning block is provided with a nut-fitting thread; when the surface of the positioning block and the surface of the rod are located on the same arc surface, the thread of the positioning block and the external thread of the rod surface are connected.

[0008] Preferably, the elastic element is a spring, and the pull rope passes through the spring and is fixed to the positioning block.

[0009] Preferably, there is a gap between the plug rod and the connecting hole.

[0010] Preferably, an oil layer is provided in the gap between the plug rod and the connecting hole.

[0011] Preferably, the connecting hole is located at the center of the rod.

[0012] Preferably, the knob end face of the plug rod is provided with a screwing groove.

[0013] Preferably, the rod is made of 645 high-quality alloy steel.

[0014] In summary, this utility model has at least one of the following beneficial effects:

[0015] (1) Instead of cutting a small shaft at the position of the tie rod to form a shoulder, the purpose of using a shoulder protruding on the tie rod is to ensure that the diameter of the tie rod is not reduced, thereby ensuring the structural strength of the tie rod.

[0016] (2) The shoulder and telescopic positioning block, because the positioning block and the protruding position of the shoulder are kept fixed, can meet the needs of quick, convenient and accurate installation on the tie rod of the template at both ends.

[0017] (3) The blocking rod can control the pull rope so that the positioning block can retract. This is to facilitate the removal of the positioning block's blocking function when the nut on the other side is tightened; and the positioning block's blocking function also needs to be removed when the sliding template in the middle is installed on the pull rod.

[0018] (4) After the nut is installed, the positioning block has a certain locking performance for the nut, which improves the stability of the nut installation.

[0019] (5) The oil and plug fill the connection hole, so that the inside of the tie rod is filled. When the tie rod is subjected to bending pressure, the plug can provide support to the main body of the tie rod and improve the strength of the tie rod.

[0020] (6) The rod is made of 645 high-quality alloy steel. 645 high-quality alloy steel is a high-strength alloy steel with good comprehensive mechanical properties and heat resistance. It is suitable for manufacturing applications requiring high strength and high toughness, thus giving the rod high fatigue resistance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the tie rod assembly in the embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of the positioning block protruding from the rod in the embodiment;

[0023] Figure 3 This is the front view of the rod in the embodiment;

[0024] Figure 4 yes Figure 3 Sectional view of AA;

[0025] Figure 5 yes Figure 4 Enlarged view of part B in the image;

[0026] Figure 6 This is a schematic diagram showing the position of the tie rod assembly on the injection molding machine in the embodiment;

[0027] Figure 7 This is a schematic diagram of the plug rod in the embodiment.

[0028] In the picture:

[0029] 1. Rod body; 11. External thread; 12. Nut;

[0030] 2. Positioning shoulder;

[0031] 3. Positioning block;

[0032] 4. Elastic components;

[0033] 5. Sliding hole;

[0034] 6. Connecting holes;

[0035] 7. Plug rod; 71. Tightening groove; 72. Sealing ring;

[0036] 8. Pull the rope;

[0037] 9. Oil layer;

[0038] 101. Front template; 102. Back template; 103. Middle template. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Example 1: A tie rod assembly used on an injection molding machine, referring to... Figure 1 It includes a rod body 1, which is a steel rod and is cylindrical in shape; both ends of the rod body 1 are provided with external threads 11;

[0041] One end of the rod body 1 is provided with an outwardly protruding positioning shoulder 2. The positioning shoulder 2 is circular and is integrally formed with the rod body 1. In other embodiments, the positioning shoulder 2 may be welded to the rod body 1.

[0042] Nuts 12 are connected to both ends of the rod body 1; one end of the rod body 1 is engaged with the positioning shoulder 2, so the external thread 11 is connected to a nut 12; the other end of the rod body 1 is provided with two nuts 12, and the two nuts 12 and the external thread 11 are threadedly connected.

[0043] Reference Figures 2-5 The other end of the rod 1 has a sliding hole 5 on its side, and a positioning block 3 slides in the sliding hole 5; the sliding hole 5 is provided with an elastic element 4 that pushes out the positioning block 3.

[0044] Therefore, the positioning block 3 and the positioning shoulder 2 are located at the two ends of the rod 1, respectively.

[0045] The elastic element 4 is a spring, and the pull rope 8 passes through the spring and is fixed to the positioning block 3. The positioning block 3 is a rectangular block, and the upper surface of the positioning block 3 is an arc surface. The upper surface of the positioning block 3 is provided with a thread for the nut 12 to engage. When the surface of the positioning block 3 and the surface of the rod 1 are located on the same arc surface, the thread of the positioning block 3 is connected to the external thread 11 on the surface of the rod 1.

[0046] The other end of the rod 1 is provided with a connecting hole 6 that communicates with the sliding hole 5;

[0047] The connecting hole 6 is opened along the axial direction of the rod 1, and the sliding hole 5 is opened along the radial direction of the rod 1.

[0048] A plug rod 7 is threaded into the connecting hole 6, and a pull rope 8 is provided between the plug rod 7 and the positioning block 3;

[0049] When the plug rod 7 is screwed into the bottom of the connecting hole 6, the positioning block 3 protrudes from the side of the rod body 1 under the action of the spring.

[0050] The end of connecting hole 6 is connected to a transverse hole, the diameter of which is smaller than the diameter of connecting hole 6;

[0051] The end of the sliding hole 5 is connected to a vertical hole, the diameter of which is smaller than the diameter of the sliding hole 5.

[0052] The horizontal and vertical holes are connected to allow the pull rope 8 to pass through;

[0053] The pull rope 8 is a metal rope, but in other embodiments, the pull rope 8 can also be a nylon rope; the ends of the stop rod 7 and the positioning block 3 are provided with pull rings, and the pull rope 8 and the two pull rings are tied together to achieve fixation.

[0054] For the plug rod 7, the plug rod 7 is a cylindrical rod; the connecting hole 6 is opened at the center of the rod body 1; there is a gap between the plug rod 7 and the connecting hole 6.

[0055] The knob end face of the plug rod 7 is provided with a screw groove 71, which is a hexagonal groove with the knob end face facing outward.

[0056] The end of the plug rod 7 facing outward is threaded, and the thread engages with the thread of the connecting hole 6 to achieve fixation.

[0057] The working principle of the tie rod in the injection molding machine is as follows:

[0058] Reference Figures 4-6First, the positioning block 3 is pressed down, and one end of the pull rod is inserted into the rear template 102. The rear template 102 and the positioning shoulder 2 are positioned to achieve quick positioning. The middle template 103 slides in the middle of the rod body 1. Then, the nut 12 is screwed into the other end, and then the positioning block 3 is raised upward for positioning. Then, the front template 101 is inserted into the rod body 1 at the position of the positioning block 3 to achieve precise positioning.

[0059] After the front template 101 and the rear template 102 are positioned by the positioning shoulder 2 and the positioning block 3 respectively, they are fixed by screwing in the nuts 12 on the outer sides of both ends.

[0060] Next, the positioning block 3 is removed, and the pre-screwed nut 12 and the inner side of the front template 101 are clamped together. Then, the pull rope 8 is loosened again, and the positioning block 3 protrudes upward, so that the thread of the positioning block 3 and the thread of the nut 12 mesh. Since the positioning block 3 maintains an upward elastic movement tendency, the positioning block 3 has a certain locking effect on the nut 12.

[0061] Example 2, a tie rod assembly used on an injection molding machine, differs from Example 1 in that, referring to... Figure 1 The rod body 1 is made of 645 high-quality alloy steel, which mainly relies on the good fatigue resistance of this material;

[0062] Reference Figure 4 An oil layer 9 is filled between the plug rod 7 and the connecting hole 6. The oil layer 9 can be a grease layer, or in other embodiments, a liquid lubricating oil layer 9.

[0063] Oil layer 9 fills part of the gap between plug rod 7 and connecting hole 6.

[0064] The assembly principle of the pull rod is as follows: first, oil is injected into the connection hole 6, and then the plug rod 7 with the pull rope 8 is inserted into the connection hole 6. The pull rope 8 extends along the sliding hole 5. The extended end of the pull rope 8 is put into the spring and the end is fixed to the positioning block 3. During the process of extending into the connection hole 6, the plug rod 7 will be squeezed and slowly enter the gap.

[0065] Example 3, a tie rod assembly used on an injection molding machine, differs from Example 1 or Example 2 in that, referring to... Figure 1 and Figure 7 The plug rod 7 is equipped with a sealing ring 72, which seals the connecting hole 6 to achieve oil isolation and sealing.

[0066] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A tie rod assembly used on an injection molding machine, comprising a rod body (1) with external threads (11) at both ends, and nuts (12) connected to both ends of the rod body (1), characterized in that: One end of the rod (1) is provided with an outwardly protruding positioning shoulder (2); the other end of the rod (1) is provided with a sliding hole (5) on its side, a positioning block (3) slides in the sliding hole (5), and the sliding hole (5) is provided with an elastic element (4) that pushes out the positioning block (3); the other end of the rod (1) is provided with a connecting hole (6) that communicates with the sliding hole (5), a plug rod (7) is threadedly connected to the connecting hole (6), and a pull rope (8) is provided between the plug rod (7) and the positioning block (3); when the plug rod (7) is screwed into the bottom of the connecting hole (6), the positioning block (3) protrudes on the side of the rod (1).

2. The tie rod assembly used on an injection molding machine according to claim 1, characterized in that: The upper surface of the positioning block (3) is provided with a thread for the nut (12) to engage; when the surface of the positioning block (3) and the surface of the rod (1) are located on the same arc surface, the thread of the positioning block (3) is connected to the external thread (11) on the surface of the rod (1).

3. The tie rod assembly used on an injection molding machine according to claim 1, characterized in that: The elastic element (4) is a spring, and the pull rope (8) passes through the spring and is fixed to the positioning block (3).

4. The tie rod assembly used on an injection molding machine according to claim 1, characterized in that: There is a gap between the plug rod (7) and the connecting hole (6).

5. A tie rod assembly for use on an injection molding machine according to claim 4, characterized in that: An oil layer (9) is provided in the gap between the plug rod (7) and the connecting hole (6).

6. The tie rod assembly for use on an injection molding machine according to claim 1, characterized in that: The connecting hole (6) is located at the center of the rod (1).

7. A tie rod assembly for use on an injection molding machine according to claim 6, characterized in that: The knob end face of the plug rod (7) is provided with a screw groove (71).

8. A tie rod assembly for use on an injection molding machine according to claim 1, characterized in that: The rod (1) is made of 645 high-quality alloy steel.

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