A dual function adjustment assembly and injection molding machine

Abstract

The application relates to a double-function adjusting assembly, a concentricity adjusting method and an injection molding machine. The double-function adjusting assembly comprises a rotating shaft body with a first end face; a spline sleeve with a second end face which is connected to the first end face; the spline sleeve is provided with a through hole for a screw rod, the inner wall of the through hole is further provided with a convex rib which is slidably connected to a key groove; a buckle is connected to a clamping groove of the screw rod and is movably connected to one end of the spline sleeve away from the rotating shaft body along the axial direction of the screw rod; a plurality of loose connection components are connected between the rotating shaft body and the spline sleeve to adjust the central axis of the screw rod passing through the spline sleeve. The application can adjust the concentricity of the screw rod during installation, is simple to operate, and can release the axial stress of the screw rod to protect the screw rod.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of transmission assemblies, in particular to a dual-function adjusting assembly and an injection molding machine. BACKGROUND

[0002] Injection molding is a method for producing molded products in industry, and the products are usually produced by using an injection molding machine, which is also called an injection machine or an injection molding machine. The injection molding machine mainly comprises a glue melting mechanism, a glue injection mechanism, a mold closing mechanism and a machine frame. The glue melting mechanism is used for transporting, stirring and melting the material. The glue injection mechanism pushes the material in the glue melting mechanism, so that the material in the glue melting mechanism enters the mold closing mechanism to form an injection molding product. The transportation, melting and stirring of the material are all completed by rotating the screw in the glue melting mechanism. During installation, if the central axis of the screw deviates, the end of the screw is prone to shaking during rotation, which accelerates the wear of the screw, the transmission shaft body and the barrel, and seriously affects the service life of the injection molding machine.

[0003] Therefore, a patent number CN20202318530.4 and a patent name "a transmission shaft assembly of an injection molding machine" disclose a transmission shaft assembly of an injection molding machine. The transmission shaft assembly comprises a transmission shaft body and deep groove ball bearings, thrust angular contact ball bearings and tapered roller bearings which are sequentially sleeved outside the transmission shaft body. During the rotation of the transmission shaft body, the central axis of the transmission shaft body is adjusted by changing the direction and size of the force transmitted by the three groups of bearings, and then the concentricity of the screw is indirectly adjusted by directly fixing the screw in the screw mounting hole of the transmission shaft body. However, the adjustment of the central line of the screw in the patent document is carried out during the rotation of the transmission shaft body, which accelerates the wear of the above-mentioned bearings and needs to frequently replace the bearings. Moreover, due to the complex structure of the injection molding machine, the disassembly and replacement of the bearings are very troublesome.

[0004] In addition, since the quality of the plastic particles added into the barrel of the injection molding machine changes, that is, the density of the plastic particles changes after melting, the pressure of the material on the screw also changes. However, the existing injection molding machine often ignores the hard extrusion damage to the screw caused by the change of the density of the plastic particles after melting when designing the structure. Moreover, the connection between the existing screw and the bearing directly adopts a key connection. In order to ensure the stability of the key connection, the screw and the inner ring of the bearing are tightly connected, so that the structure design for adjusting the axial pressure of the screw cannot be carried out, which leads to the easy damage of the screw. SUMMARY

[0005] In order to reduce the damage to the screw, both the concentricity of the screw and the axial pressure of the screw need to be adjusted. The application provides a dual-function adjusting assembly.

[0006] In a first aspect, the dual-function adjusting assembly provided by the application adopts the following technical scheme:

[0007] A dual-function adjusting assembly for adjusting the central axis and axial pressure of a screw, the screw being provided with a threaded segment, a clamping groove and a key groove along the length direction of the screw, the adjusting assembly comprising:

[0008] a rotating shaft body having a first end face;

[0009] a spline sleeve having a second end face, the second end face being abutted to the first end face; the spline sleeve being provided with a through hole for the screw to pass through, the inner wall of the through hole being further provided with a convex rib, the convex rib being slidably connected to the key groove;

[0010] a buckle being clamped in the clamping groove of the screw and being movably hooked to the spline sleeve away from the rotating shaft body along the axial direction of the screw;

[0011] a plurality of loose connection components being connected between the rotating shaft body and the spline sleeve to adjust the central axis of the screw passing through the spline sleeve.

[0012] Optionally, the loose connection components comprise a first threaded fastener, the first threaded fastener passing through the second end face of the spline sleeve and being threadedly connected to the first end face of the rotating shaft body.

[0013] Optionally, the first end face is formed with a first groove, the second end face is formed with a first protrusion, the first protrusion extending into the first groove and having a gap between the first protrusion and the first groove along the radial direction of the spline sleeve.

[0014] The first protrusion and the first groove are both cylindrical, and the first protrusion is formed by extending outward from the middle part of the second end face, and the first threaded fastener is uniformly distributed and connected to the periphery of the first end face.

[0015] Optionally, there is a gap between the first protrusion and the first groove along the length direction of the spline sleeve.

[0016] Optionally, there is a gap between the second protrusion and the second groove along the length direction of the spline sleeve.

[0017] Optionally, the buckle is provided with a clamping hole matched with the clamping groove, the clamping groove of the screw is clamped in the clamping hole; the inner wall of the buckle is formed with a second groove, the outer peripheral wall of the end of the spline sleeve away from the rotating shaft body is formed with a second protrusion extending outward, and the second protrusion is movably hooked in the second groove.

[0018] Optionally, there is a gap between the second protrusion and the second groove along the length direction of the spline sleeve.

[0019] Optionally, the second protrusion is annular, the buckle comprises at least two detachably connected buckle petals, the plurality of buckle petals are clamped in the clamping groove to form an annular shape, the second groove is formed in the inner wall of the buckle petal, and the second protrusion is movably hooked in the second groove.

[0020] Optionally, the spline sleeve is provided with a first maintenance hole at one end away from the rotating shaft body, the buckle is provided with a second maintenance hole, the second maintenance hole is in communication with the first maintenance hole, and the through hole is a through hole.

[0021] In a second aspect, the injection molding machine provided by the application adopts the technical scheme as follows:

[0022] An injection molding machine comprises a rack, a mold closing mechanism, a glue melting mechanism and a glue injecting mechanism, the mold closing mechanism and the glue injecting mechanism are fixedly connected to the rack, the glue injecting mechanism is connected to the glue melting mechanism to push the material in the glue melting mechanism into the mold closing mechanism, the glue melting mechanism comprises a glue melting driving member, a screw rod and an adjusting assembly as described above, the rotating shaft body of the adjusting assembly is fixedly connected to the power output end of the glue melting driving member, and the screw rod is arranged in the spline sleeve of the adjusting assembly and clamped in the buckle of the adjusting assembly.

[0023] In summary, the application has at least one beneficial technical effect as follows:

[0024] The concentricity of the screw rod is adjusted from the installation, i.e., the adjustment is made from the root cause, the wear of parts caused by the eccentricity of the screw rod is reduced, the concentricity is adjusted by adjusting the tightness of the first threaded fastener, the operation is simple, the axial stress of the screw rod is released by the adjusting assembly, the deformation of the screw rod is reduced, and thus the screw rod is protected. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural diagram of a screw rod of an embodiment of the application.

[0026] Figure 2 FIG. 2 is a cross-sectional view of the screw rod and the adjusting assembly of the embodiment of the application.

[0027] Figure 3 FIG. 3 is a structural diagram of a spline sleeve of the embodiment of the application.

[0028] Figure 4 FIG. 4 is an exploded view of the adjusting assembly and the screw rod of the embodiment of the application.

[0029] Figure 5 FIG. 5 is a structural schematic view of the injection molding machine of the embodiment of the application.

[0030] Explanation of reference signs: 1, screw rod; 11, threaded segment; 12, clamping groove; 13, key groove; 2, adjusting assembly; 21, rotating shaft body; 211, first end face; 2111, first threaded hole; 2112, first recess; 22, spline sleeve; 221, second end face; 2211, first protrusion; 222, through hole; 2221, convex rib; 223, first connecting hole; 224, second protrusion; 225, first maintenance hole; 23, buckle; 231, clamping hole; 232, second recess; 233, buckle petal; 2331, second connecting hole; 2332, second threaded hole; 234, second maintenance hole; 24, elastic connecting component; 241, first threaded fastener; 25, second threaded fastener; 3, rack; 4, mold closing mechanism; 5, glue melting mechanism; 6, glue injection mechanism. DETAILED DESCRIPTION

[0031] The application will be further described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1 and Figure 2 The screw rod 1 is provided with a threaded segment 11, a clamping groove 12 and a key groove 13 for transmitting torque along the length direction of the screw rod 1. Generally, the central axis a of the screw rod 1 will be offset after installation.

[0033] Reference Figure 2 The embodiment of the application discloses a dual-function adjusting assembly 2 for adjusting the concentricity of the screw rod 1. Whether the screw rod 1 is concentric is whether the actual central axis a of the screw rod 1 itself when rotating coincides with the reference axis of the screw rod 1, which is the central axis a of the screw rod 1 itself when rotating under the condition that the size and installation deviation are zero.

[0034] Reference Figure 2 , Figure 3 and Figure 4 The adjusting assembly 2 comprises a rotating shaft body 21, a spline sleeve 22, a buckle 23 and a first threaded fastener 241. The rotating shaft body 21 has a first end face 211. The spline sleeve 22 has a second end face 221 which is butted against the first end face 211; the spline sleeve 22 has a through hole 222 for passing the screw rod 1, and the inner wall of the through hole 222 is further provided with a convex rib 2221 which is slidably connected in the key groove 13 (refer to Figure 1 ). The buckle 23 is clamped in the clamping groove 12 of the screw rod 1 and is hooked at the end of the spline sleeve 22 away from the rotating shaft body 21, so as to prevent the screw rod 1 from being separated from the spline sleeve 22.

[0035] The elastic connecting component 24 is connected between the rotating shaft body 21 and the spline sleeve 22 to adjust the central axis of the screw rod 1 passing through the spline sleeve 22.

[0036] The structural design principle of the dual-function adjusting assembly 2 is that the screw rod 1 and the rotating shaft body 21 are not directly fixed, that is, the screw rod 1 is separated from the rotating shaft body 21 through the spline sleeve 22; the screw rod 1 is driven by the slight movement of the spline sleeve 22, so as to adjust the central axis of the screw rod 1, that is, to adjust the concentricity of the screw rod 1 relative to the rotating shaft body 21.

[0037] Meanwhile, the buckle 23 is movably hooked on the spline sleeve 22. When the density of the material in the barrel of the injection molding machine changes, the pressure of the material changes, the thrust on the screw rod 1 in the barrel changes, the screw rod 1 drives the buckle 23 to move back and forth along the length direction of the spline sleeve 22, which is equivalent to releasing the axial pressure of the screw rod 1, reducing the deformation of the screw rod 1 and the adjusting assembly 2, thereby protecting the screw rod 1 and the adjusting assembly 2.

[0038] The loose connection component 24 includes a first threaded fastener 241, which is threaded into the second end face 221 of the spline sleeve 22 and is screwed into the first end face 211 of the rotating shaft body 21; specifically, the spline sleeve 22 is provided with a plurality of first connecting holes 223, the rotating shaft body 21 is provided with a plurality of first threaded holes 2111, and the first threaded fastener 241 is correspondingly threaded into the first connecting hole 223 and screwed into the first threaded hole 2111.

[0039] The specific adjusting steps of the dual-function adjusting assembly 2 are as follows: first, the rotating shaft body 21 is fixedly installed on the power output end, the spline sleeve 22 is pre-positioned and installed on the rotating shaft body 21, the screw rod 1 is threaded into the spline sleeve 22, the convex rib 2221 of the spline sleeve 22 is slidably connected to the key groove 13 of the screw rod 1, the buckle 23 is clamped into the clamping groove 12 of the screw rod 1 and is hooked on the end of the spline sleeve 22 away from the rotating shaft body 21; then, the measuring instrument (such as a dial gauge or a dial gauge) is installed on the adjusting assembly 2, and the screw rod 1 is rotated to measure whether the central axis a of the screw rod 1 is offset; finally, the tightness of the first threaded fastener 241 is adjusted according to the offset amount, so that the concentricity of the screw rod 1 is adjusted. The adjustment method of the concentricity is to adjust the skew of the screw rod 1 from the installation, which can obviously prolong the service life of the screw rod 1, the barrel and other parts.

[0040] Reference Figure 2 and Figure 4In order to facilitate positioning of the second end face 221 of the spline sleeve 22 to the first end face 211 of the rotating shaft body 21, in the present embodiment, the first end face 211 is formed with a first recess 2112, and the second end face 221 is formed with a first protrusion 2211; in other embodiments, the first end face 211 can be formed with the first protrusion 2211, and the second end face 221 can be formed with the first recess 2112. The first protrusion 2211 extends into the first recess 2112 to quickly achieve positioning of the spline sleeve 22. In order to enable the positioning arrangement of the first protrusion 2211 and the first recess 2112 without affecting the movement of the spline sleeve 22 relative to the rotating shaft body 21, there is a gap b between the first protrusion 2211 and the first recess 2112 along the length direction of the spline sleeve 22. Further, in order to enable adjustment of the central axis a of the screw 1 from each angle around the spline sleeve 22, i.e. to enable movement of the spline sleeve 22 along the radial direction of the spline sleeve 22, the first protrusion 2211 and the first recess 2112 are both circular, and the first protrusion 2211 is formed by extending outward from the middle portion of the second end face 221, and the first threaded fasteners 241 are uniformly distributed and connected to the periphery of the first end face 211.

[0041] In order to reduce the friction of the spline sleeve 22, there is a gap c between the first protrusion 2211 and the first recess 2112 along the length direction of the spline sleeve 22. Specifically, the height of the first protrusion 2211 is less than the depth of the first recess 2112.

[0042] The buckle 23 is clamped in the clamping groove 12 of the screw 1 and hooks the end of the spline sleeve 22 away from the rotating shaft body 21. Specifically, the center of the buckle 23 is provided with a clamping hole 231, which is matched with the clamping groove 12, and the clamping groove 12 of the screw 1 is clamped in the clamping hole 231; the inner wall of the buckle 23 is formed with a second recess 232, and the outer peripheral wall of the end of the spline sleeve 22 away from the rotating shaft body 21 is formed with a second protrusion 224 extending outward, and the second protrusion 224 extends into the second recess 232.

[0043] Along the length direction of the spline sleeve 22, there is a gap d between the second protrusion 224 and the second recess 232. Specifically, the second protrusion 224 and the second recess 232 are both annular, and the thickness of the spline sleeve 224 is less than the width of the second recess 223. When the seal of the material in the barrel changes, the screw 1 can move back and forth along the length direction of the screw 1, thereby releasing the pressure received by the screw 1 and the adjusting assembly 2.

[0044] Reference Figure 4When the second protrusion 224 is annular, it is convenient to process, but the hooking between the buckle 23 and the spline sleeve 22 cannot be realized, so the buckle 23 comprises at least two detachably connected buckle petals 233, and the plurality of buckle petals 233 are clamped in the clamping groove 12 to be enclosed into an annular shape. Specifically, the buckle petal 233 is provided with a second connecting hole 2331 and a second threaded hole 2332, and the second threaded fastener 25 is correspondingly inserted into the second connecting hole 2331 and the second threaded hole 2332, so as to fixedly connect the plurality of buckle petals 233 to each other and clamp them in the clamping groove 12 of the screw rod 1. The second groove 232 is formed in the inner wall of the buckle petal 233, and the second protrusion 224 is movably hooked in the second groove 232.

[0045] With reference to Figure 2 In order to facilitate cleaning and maintenance, the screw rod 1 usually needs to be rotated, and the spline sleeve 22 is provided with a first maintenance hole 225 at one end away from the rotating shaft body 21, and the buckle 23 is provided with a second maintenance hole 234 in communication with the first maintenance hole 225. In this way, the shaft pin is inserted into the first maintenance hole 225 and the second maintenance hole 234, so that the screw rod 1 can be rotated more easily.

[0046] In the field of injection molding machines, usually, the pressure sensor is installed at one end of the rotating shaft body 21 away from the spline sleeve 22, and the back pressure received by the rotating shaft body 21 will be directly transmitted to the pressure sensor. The pressure of the material in the barrel on the screw rod 1 will move towards the rotating shaft body 21. In order to make the pressure sensor more accurately detect the pressure value of the material in the barrel, the through hole 222 of the spline sleeve 22 is a through hole (see Figure 2 or Figure 3 In this way, the screw rod 1 directly abuts against the rotating shaft body 21 after receiving the pressure of the material in the barrel.

[0047] The embodiment of the present application also discloses an injection molding machine.

[0048] With reference to Figure 2 and Figure 5 The injection molding machine comprises a rack 3, a mold closing mechanism 4, a glue melting mechanism 5 and a glue injecting mechanism 6, the mold closing mechanism 4 and the glue injecting mechanism 6 are fixedly connected to the rack 3, and the glue injecting mechanism 6 is connected to the glue melting mechanism 5 to push the material in the glue melting mechanism 5 into the mold closing mechanism 4. The glue melting mechanism 5 comprises a glue melting driving member, the screw rod 1 and the adjusting assembly 2 as described above, the rotating shaft body 21 of the adjusting assembly 2 is fixedly connected to the power output end of the glue melting driving member, and the screw rod 1 is clamped in the buckle 23 of the adjusting assembly 2 and passes through the spline sleeve 22 of the adjusting assembly 2.

[0049] The embodiment of the present application also discloses a concentricity adjusting method.

[0050] With reference to Figure 2The method for adjusting the concentricity of the screw 1 by using the adjusting assembly 2 as described above comprises the following steps:

[0051] A1, fixing and connecting the rotating shaft body 21 to the rotating power output end;

[0052] A2, pre-positioning and integrating the spline sleeve 22 and the rotating shaft body 21 by using the first threaded fastener 241;

[0053] A3, passing the screw 1 through the spline sleeve 22, and sliding the convex rib 2221 of the spline sleeve 22 in the key groove 13 of the screw 1;

[0054] A4, clamping the buckle 23 in the clamping groove 12 of the screw 1 and hooking the end of the spline sleeve 22 away from the rotating shaft body 21;

[0055] A5, adjusting the tightness of the first threaded fastener 241 to adjust the central axis a of the screw 1.

[0056] The above are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A dual function adjustment assembly (2) for adjusting the central axis and axial pressure of a screw rod (1), the screw rod (1) being provided with a threaded section (11), a clamping groove (12) and a key groove (13) along the length direction of the screw rod (1), characterized in that, The adjusting assembly (2) comprises: a rotating shaft body (21) having a first end face (211); a spline sleeve (22) having a second end face (221) which is butted against the first end face (211); the spline sleeve (22) has a through hole (222) for the screw rod (1) to pass through, and the inner wall of the through hole (222) is further provided with a convex rib (2221) which is slidably connected in the key groove (13); a buckle (23) which is clamped in the clamping groove (12) of the screw rod (1) and is movably hooked on the end of the spline sleeve (22) away from the rotating shaft body (21); the center of the buckle (23) is provided with a clamping hole (231) matched with the clamping groove (12), and the clamping groove (12) of the screw rod (1) is clamped in the clamping hole (231); the inner wall of the buckle (23) is formed with a second groove (232), and the outer peripheral wall of the end of the spline sleeve (22) away from the rotating shaft body (21) is outwardly extended to form a second convex (224) which is movably hooked in the second groove (232); a plurality of loose connection components (24) which are connected between the rotating shaft body (21) and the spline sleeve (22) to adjust the central axis of the screw rod (1) passing through the spline sleeve (22); the first end face (211) is formed with a first groove (2112), and the second end face (221) is formed with a first convex (2211) which extends into the first groove (2112) and has a gap (b) between the first convex (2211) and the first groove (2112) along the radial direction of the spline sleeve (22); there is a gap (c) between the first convex (2211) and the first groove (2112) along the length direction of the spline sleeve (22); and there is a gap (d) between the second convex (224) and the second groove (232) along the length direction of the spline sleeve (22).

2. The dual function adjustment assembly (2) according to claim 1, characterized in that The loose connection component (24) comprises a first threaded fastener (241) which passes through the second end face (221) of the spline sleeve (22) and is threadedly connected in the first end face (211) of the rotating shaft body (21).

3. The dual function adjustment assembly (2) according to claim 2, characterized in that The first convex (2211) and the first groove (2112) are both cylindrical, and the first convex (2211) is outwardly extended from the middle part of the second end face (221); and the first threaded fastener (241) is uniformly distributed and connected to the periphery of the first end face (211).

4. The dual function adjustment assembly (2) according to claim 1, characterized in that The second protrusion (224) is annular, the buckle (23) comprises at least two detachably connected buckle petals (233), a plurality of the buckle petals (233) are clamped in the clamping groove (12) to be enclosed into an annular shape, the second groove (232) is formed in the inner wall of the buckle petal (233), and the second protrusion (224) is movably hooked in the second groove (232).

5. The dual function adjustment assembly (2) according to claim 1, characterized in that, The spline sleeve (22) is provided with a first maintenance hole (225) away from one end of the rotating shaft body (21), the buckle (23) is provided with a second maintenance hole (234), the second maintenance hole (234) is in communication with the first maintenance hole (225), and the through hole (222) is a through hole.

6. An injection molding machine comprising a frame (3), a clamping mechanism (4), a melting mechanism (5) and a shooting mechanism (6), the clamping mechanism (4) and the shooting mechanism (6) are fixedly connected to the frame (3) respectively, the shooting mechanism (6) is connected to the melting mechanism (5) to push the material in the melting mechanism (5) into the clamping mechanism (4), characterized in that, The glue melting mechanism (5) comprises a glue melting driving element, a screw rod (1) and the adjusting assembly (2) according to any one of claims 1-5, the rotating shaft body (21) of the adjusting assembly (2) is fixedly connected to the power output end of the glue melting driving element, the screw rod (1) is arranged in the spline sleeve (22) of the adjusting assembly (2) and is clamped in the buckle (23) of the adjusting assembly (2).

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