Pull rod fixing device of injection molding machine

Abstract

The utility model relates to an injection molding machine pull rod fixing device which comprises a pull rod body and a fixed mold, one side of the fixed mold is provided with a through hole used for installing the pull rod body, the end portion of the pull rod body protrudes to form an extension portion penetrating through the through hole, a fastening shaft sleeve is connected between the extension portion and the through hole, and the fastening shaft sleeve is fixedly connected with the fixed mold. The end, extending out of the through hole, of the extending part is connected with a voltage dividing assembly. The utility model relates to the technical field of injection molding machines. According to the pull rod fixing device of the injection molding machine, the pull rod body and the fixed mold can be firmly fixed together through the arranged fastening shaft sleeve, the arranged partial pressure assembly can share tensile stress borne by a handrail body when the pull rod body is subjected to tensile force and generates the tensile stress, protection on the pull rod body can be effectively improved, and the service life of the pull rod body is prolonged. The service life of the pull rod body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a tie rod fixing device for an injection molding machine. Background Art

[0002] Injection molding machine is also called injection molding machine or injection machine. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. The tie rod of the injection molding machine is an important part of the injection molding machine industry. In the clamping mechanism, the performance of the tie rod of the injection molding machine directly affects the rigidity and stability of the system. Improving the structural characteristics of the tie rod of the injection molding machine can effectively improve the rigidity and stability of the system.

[0003] In the prior art, the tie rod of the injection molding machine needs to withstand a large tensile force during the use of the mold. When the existing tie rod is in use, the screw at the tie rod head bears all the tensile load, but due to the material, processing technology and other reasons of the tie rod, the load on each thread is uneven, causing the tie rod to easily break when pulled, thereby affecting the normal operation of the injection molding machine. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a tie rod fixing device for an injection molding machine so as to solve the technical problems mentioned in the above background technology.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A tie rod fixing device for an injection molding machine comprises a tie rod body and a fixed mold, a through hole for mounting the tie rod body is formed on one side of the fixed mold, an end protrusion of the tie rod body is formed with an extension portion passing through the through hole, a fastening sleeve is connected between the extension portion and the through hole, and one end of the extension portion extending out of the through hole is connected to a pressure divider assembly.

[0007] Furthermore, the inner wall and outer wall of the fastening sleeve are processed with internal threads and external threads respectively, and the inner wall of the through hole and the outer wall of the extension portion are processed with thread grooves threadedly connected to the fastening sleeve.

[0008] Furthermore, the outer wall protrusion of the fastening sleeve located outside the through hole forms a retaining ring portion, and a first buffer washer is fixedly connected between the retaining ring portion and the fixed mold.

[0009] Furthermore, the pressure dividing assembly includes a support sleeve, a piston and a connecting rod, one side of the support sleeve is fixedly connected to the fixed mold, a pressure chamber is opened in the support sleeve, a piston is slidably connected in the pressure chamber, one side of the piston is fixedly connected to a connecting rod, the connecting rod extends out of the pressure chamber and is connected to the extension part.

[0010] Furthermore, a side of the support sleeve close to the fixed mold is provided with an escape groove for evading the retaining ring portion and the extension portion, and a second buffer washer in contact with the retaining ring portion is fixedly connected in the escape groove.

[0011] Furthermore, a plurality of circular holes are provided in an annular array on one side of the piston close to the connecting rod and is slidably connected to a slider, a groove is provided on the side of the slider away from the connecting rod, and a square groove connected to the groove is provided on the outer side wall of the slider close to the connecting rod.

[0012] Furthermore, the inner wall of the circular hole is concave to form a limiting groove, and a limiting ring fixedly connected to the slider is arranged in the limiting groove, and a spring is arranged between the side of the limiting ring close to the connecting rod and the limiting groove, so that when the spring pushes the limiting ring to contact the inner wall of the limiting groove, the length of the square groove extending out of the circular hole is less than half the length of the square groove.

[0013] In summary, the present invention includes at least one of the following beneficial technical effects:

[0014] 1. The tie rod fixing device of the injection molding machine can be used to firmly fix the tie rod body and the fixed mold together through the arranged fastening sleeve, and the arranged pressure dividing component can share the tensile stress of the railing body when the tie rod body is subjected to tensile force and generates tensile stress, which can effectively improve the protection of the tie rod body and extend the service life of the tie rod body;

[0015] 2. This kind of injection molding machine tie rod fixing device, by opening a circular hole on the piston and connecting a slider in the circular hole, can be used to control the damping force applied to the piston when it moves, so that the piston can better absorb the tensile stress applied to the tie rod body, thereby reducing the damage caused by the tensile stress to the tie rod body, thereby improving the protection effect of the tie rod body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 The utility model is a structural schematic diagram of a tie rod fixing device for an injection molding machine.

[0018] Figure 2 The utility model is a schematic diagram of the internal structure of a tie rod fixing device for an injection molding machine.

[0019] Figure 3 The utility model is a schematic diagram of the connection structure between a pressure dividing assembly and a tie rod body in a tie rod fixing device for an injection molding machine.

[0020] Figure 4 The utility model is a structural schematic diagram of a pressure dividing component in a tie rod fixing device for an injection molding machine.

[0021] Figure 5 The utility model is a structural schematic diagram of a piston in a tie rod fixing device for an injection molding machine.

[0022] Figure 6 The utility model is a schematic diagram of the internal structure of a piston in a tie rod fixing device for an injection molding machine.

[0023] In the figure, 1, pull rod body; 2, fixed mold; 3, through hole; 4, extension part; 5, fastening sleeve; 6, pressure dividing assembly; 61, support sleeve; 62, piston; 63, connecting rod; 7, retaining ring part; 8, first buffer washer; 9, pressure chamber; 10, avoidance groove; 11, second buffer washer; 12, round hole; 13, slider; 14, groove; 15, square groove; 16, limit groove; 17, limit ring. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0025] Example:

[0026] Reference Figure 1 - Figure 6 The utility model discloses a tie rod fixing device for an injection molding machine, comprising a tie rod body 1 and a fixed mold 2. A through hole 3 for installing the tie rod body 1 is opened on one side of the fixed mold 2. An extension portion 4 passing through the through hole 3 is formed on the end protrusion of the tie rod body 1. A fastening sleeve 5 is connected between the extension portion 4 and the through hole 3. One end of the extension portion 4 extending out of the through hole 3 is connected to a pressure dividing component 6.

[0027] In this embodiment, during installation, the extension portion 4 of the pull rod body 1 is passed through the through hole 3, and then the fastening sleeve 5 is installed between the extension portion 4 and the through hole 3, and the pull rod body 1 and the fixed mold 2 are fixed by the fastening sleeve 5.

[0028] When the pull rod body 1 is subjected to tension during use, the pull rod body 1 is subjected to the friction force exerted by the fastening sleeve 5, and the fastening sleeve 5 is used to share the tensile stress. Figure 1 and Figure 2It can be found that a pressure-dividing component 6 is also connected to the end of the extension portion 4 extending out of the through hole 3, so that the tensile stress on the pull rod body 1 will be further shared by the pressure-dividing component 6, which can effectively reduce the tensile stress on the pull rod body 1, thereby ensuring the installation stability of the pull rod body 1 and the fixed mold 2 while improving the protection effect of the pull rod body 1, and avoiding the breakage of the pull rod body 1 due to uneven distribution of the tensile stress on the pull rod body 1.

[0029] In a further preferred embodiment of the present invention, Figure 2 As shown, the inner wall and outer wall of the fastening sleeve 5 are respectively processed with internal threads and external threads, and the inner wall of the through hole 3 and the outer wall of the extension part 4 are both processed with thread grooves threadedly connected to the fastening sleeve 5.

[0030] In this embodiment, by processing threads on the inner and outer walls of the fastening sleeve 5, and processing thread grooves threadedly connected to the fastening sleeve 5 on the outer wall of the extension portion 4 and the inner wall of the through hole 3, the contact area between the fastening sleeve 5 and the extension portion 4 and the through hole 3 can be increased, so that when the tensile stress of the pull rod body 1 increases, the fastening sleeve 5 can be used to enhance the sharing of the tensile stress, which can effectively improve the tensile strength of the pull rod body 1.

[0031] Moreover, the setting of the thread can make the railing body to be pulled to produce a movement tendency away from the fixed mold 2, so that the extension part 4 and the fastening sleeve 5 produce a movement tendency along the axis of the through hole 3. The threaded contact between the fastening sleeve 5 and the through hole 3 is utilized to make the through hole 3 prevent the fastening sleeve 5 from moving, so that the fastening sleeve 5 applies a reaction force to the pull rod body 1 to prevent the movement, which can make the fixing effect of the pull rod body 1 better.

[0032] In a further preferred embodiment of the present invention, Figure 2 As shown, the outer wall protrusion of the fastening sleeve 5 outside the through hole 3 forms a retaining ring portion 7, and a first buffer washer 8 is fixedly connected between the retaining ring portion 7 and the fixed mold 2.

[0033] In this embodiment, a retaining ring portion 7 is provided on the outer side wall of the fastening sleeve 5 outside the through hole 3, so that the retaining ring portion 7 can be used to limit the screw-in depth of the fastening sleeve 5 when the fastening sleeve 5 is installed, and the retaining ring portion 7 contacts the outer wall of the fixed mold 2 after the fastening sleeve 5 is installed, and can also prevent the fastening sleeve 5 from moving due to the pulling force from the pull rod body 1, which can further enhance the fixing effect of the fastening sleeve 5 on the pull rod body 1.

[0034] However, due to the arrangement of the thread and the retaining ring 7, the rigid fixation of the fastening sleeve 5 to the tie rod body 1 is too strong, which will make it difficult for the tie rod body 1 to make a small movement to relieve the tensile stress under the fixation of the fastening sleeve 5, thereby causing the pressure-dividing effect of the pressure-dividing assembly 6 on the tie rod body 1 to deteriorate, affecting the protection of the tie rod body 1. Therefore, a first buffer washer 8 is arranged between the retaining ring 7 and the fixed mold 2, which can be used to prevent the fastening sleeve 5 from having an excessively good fixation effect on the tie rod body 1 and affecting the pressure-dividing effect on the tie rod body 1.

[0035] At the same time, the provision of the first buffer washer 8 can also be used to enhance the ability of the fastening sleeve 5 to share the tensile stress of the pull rod body 1 , which can further enhance the protective effect of the pull rod body 1 .

[0036] In a further preferred embodiment of the present invention, Figure 2 - Figure 4 As shown, the pressure dividing assembly 6 includes a support sleeve 61, a piston 62 and a connecting rod 63. One side of the support sleeve 61 is fixedly connected to the fixed mold 2. A pressure chamber 9 is opened in the support sleeve 61. The piston 62 is slidably connected in the pressure chamber 9. One side of the piston 62 is fixedly connected to the connecting rod 63. The connecting rod 63 extends out of the pressure chamber 9 and is connected to the extension part 4.

[0037] In this embodiment, by opening a pressure chamber 9 in the support sleeve 61, the piston 62 can be disturbed by the fluid in the pressure chamber 9 when moving, and the fluid can generate a damping force on the piston 62, thereby preventing the piston 62 from moving.

[0038] By connecting the piston 62 to the extension portion 4 via the connecting rod 63, when the pull rod body 1 is subjected to a tensile force and generates tensile stress, the tensile stress can be transmitted to the piston 62 via the connecting rod 63, causing the piston 62 to have a tendency to move. Subsequently, resistance is applied to the piston 62 by utilizing the damping of the fluid, so that the piston 62 shares the tensile stress exerted on the pull rod body 1, thereby effectively improving the protection effect on the pull rod body 1.

[0039] And observe Figure 2 It can be found that a spring is arranged between the side of the piston 62 away from the pull rod body 1 and the pressure chamber 9, so that the pressure dividing assembly 6 can be pushed by the spring to move to the leftmost side of the pressure groove when not installed, so that the connecting rod 63 maintains the maximum extension length, which can facilitate the connection between the connecting rod 63 of the pressure dividing assembly 6 and the connecting part of the pull rod body 1, making the installation of the pressure dividing assembly 6 more convenient.

[0040] In a further preferred embodiment of the present invention, Figure 2 and Figure 3As shown, a side of the support sleeve 61 close to the fixed mold 2 is provided with an escape groove 10 for evading the retaining ring portion 7 and the extending portion 4 , and a second buffer washer 11 in contact with the retaining ring portion 7 is fixedly connected in the escape groove 10 .

[0041] In this embodiment, because the fastening sleeve 5 is located outside the through hole 3 and is provided with a retaining ring portion 7, and the support sleeve 61 needs to be fixedly connected to the outer wall of the fixed mold 2, the support sleeve 61 will be affected by the retaining ring portion 7 and cannot be directly fitted with the outer wall of the fixed mold 2, affecting the fixing effect of the support sleeve 61. Figure 2 and Figure 3 It can be found that the side wall of the support sleeve 61 is provided with an avoidance groove 10 for accommodating the retaining ring part 7, so that the retaining ring part 7 can better fit with the outer wall of the fixed mold 2, making the installation of the pressure dividing component 6 more stable, thereby ensuring the pressure dividing effect of the pressure dividing component 6 on the railing body.

[0042] In a further preferred embodiment of the present invention, Figure 4 - Figure 6 As shown, a plurality of circular holes 12 are provided in a circular array on one side of the piston 62 close to the connecting rod 63, and a slider 13 is slidably connected thereto. A groove 14 is provided on the side of the slider 13 away from the connecting rod 63, and a square groove 15 connected to the groove 14 is provided on the outer side wall of the slider 13 close to the connecting rod 63.

[0043] In this embodiment, by providing a plurality of circular holes 12 on the piston 62, the circular holes 12 can be used to make the fluid in the pressure chamber 9 flow when the piston 62 moves in the pressure chamber 9, so that the damping force generated when the fluid flows provides buffering for the piston 62, so that the piston 62 can buffer the tensile stress of the pull rod body 1.

[0044] By setting a slider 13 in the circular hole 12 and observing Figure 4 and Figure 6 A groove 14 is provided on the side of the slider 13 away from the pull rod body 1, and a square groove 15 connected to the groove 14 is provided on the outer wall of the slider 13 close to the pull rod body 1, which can be used to control the passage cross-section of the fluid, so that different damping forces are obtained when the piston 62 moves in different directions.

[0045] By opening the square groove 15 on the side of the slider 13 close to the pull rod body 1, when the piston 62 moves due to the pulling force of the pull rod body 1, the pressure exerted by the fluid flow will press the slider 13 into the circular hole 12, so that the square groove 15 is blocked by the circular hole 12 and the flowable cross-section is reduced, so that the piston 62 obtains greater damping, which can be used to better share the pulling force on the pull rod body 1 and enhance the protection effect of the pull rod body 1.

[0046] In a further preferred embodiment of the present invention, Figure 5 and Figure 6 As shown, the inner wall of the circular hole 12 is concave to form a limiting groove 16, and a limiting ring 17 fixedly connected to the slider 13 is arranged in the limiting groove 16, and a spring is arranged between the side of the limiting ring 17 close to the connecting rod 63 and the limiting groove 16, so that when the spring pushes the limiting ring 17 to contact the inner wall of the limiting groove 16, the length of the square groove 15 extending out of the circular hole 12 is less than half the length of the square groove 15.

[0047] In this embodiment, a limiting groove 16 is provided on the inner wall of the circular hole 12, and the limiting groove 16 is connected to the slider 13 via a limiting ring 17, so as to prevent the slider 13 from escaping from the circular groove and losing the effect of controlling the piston 62 to change the damping force according to the direction of movement.

[0048] The provided spring can be used to push the slider 13 to remain in the circular hole 12, so that the square groove 15 of the slider 13 will be blocked by the circular hole 12 under normal conditions and the flow cross-section of the fluid will be reduced, so that the piston 62 always maintains the maximum damping force when moving toward the pull rod body 1, thereby making the pressure division effect more stable.

[0049] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A tie rod fixing device for an injection molding machine, comprising a tie rod body (1) and a fixed mold (2), characterized in that: A through hole (3) for mounting the pull rod body (1) is provided on one side of the fixed mold (2); an end protrusion of the pull rod body (1) is formed with an extension portion (4) passing through the through hole (3); a fastening sleeve (5) is connected between the extension portion (4) and the through hole (3); and one end of the extension portion (4) extending out of the through hole (3) is connected to a pressure dividing assembly (6).

2. The tie rod fixing device for an injection molding machine according to claim 1, characterized in that: The inner wall and outer wall of the fastening sleeve (5) are respectively processed with internal threads and external threads, and the inner wall of the through hole (3) and the outer wall of the extension portion (4) are both processed with thread grooves threadedly connected to the fastening sleeve (5).

3. The tie rod fixing device for an injection molding machine according to claim 2, characterized in that: The outer wall protrusion of the fastening sleeve (5) located outside the through hole (3) forms a retaining ring portion (7), and a first buffer washer (8) is fixedly connected between the retaining ring portion (7) and the fixed mold (2).

4. The tie rod fixing device for an injection molding machine according to claim 3, characterized in that: The pressure dividing assembly (6) comprises a support sleeve (61), a piston (62) and a connecting rod (63); one side of the support sleeve (61) is fixedly connected to the fixed mold (2); a pressure chamber (9) is provided in the support sleeve (61); a piston (62) is slidably connected in the pressure chamber (9); one side of the piston (62) is fixedly connected to a connecting rod (63); the connecting rod (63) extends out of the pressure chamber (9) and is connected to the extension portion (4).

5. The tie rod fixing device for an injection molding machine according to claim 4, characterized in that: A relief groove (10) for evading the retaining ring portion (7) and the extension portion (4) is provided on a side of the support sleeve (61) close to the fixed mold (2), and a second buffer washer (11) in contact with the retaining ring portion (7) is fixedly connected in the relief groove (10).

6. The tie rod fixing device for an injection molding machine according to claim 4, characterized in that: A plurality of circular holes (12) are provided in an annular array on one side of the piston (62) close to the connecting rod (63) and is slidably connected to a slider (13); a groove (14) is provided on the side of the slider (13) away from the connecting rod (63); and a square groove (15) connected to the groove (14) is provided on the outer side wall of the slider (13) close to the connecting rod (63).

7. The tie rod fixing device for an injection molding machine according to claim 6, characterized in that: The inner side wall of the circular hole (12) is concave to form a limiting groove (16), and a limiting ring (17) fixedly connected to the slider (13) is arranged in the limiting groove (16). A spring is arranged between the limiting groove (16) and the side of the limiting ring (17) close to the connecting rod (63), so that when the spring pushes the limiting ring (17) to contact the inner wall of the limiting groove (16), the length of the square groove (15) extending out of the circular hole (12) is less than half the length of the square groove (15).

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