A connecting structure of an injection molding machine screw and a hand tool and an injection molding machine

Abstract

The utility model discloses a connecting structure and injection molding machine of injection molding machine screw and counter hand, wherein, connecting structure includes screw, annular pressing plate, counter hand and buffer structural member, and annular pressing plate is formed by two half ring pressing plates splicing, and the accommodating hole groove is formed on counter hand, and the end of screw inserts into accommodating hole groove, and annular pressing plate is sleeved on the shaft shoulder of screw, and is fixedly connected with counter hand, and buffer structural member is located in accommodating hole groove, and includes support column, elastic part and fixed block, and fixed block is fixed in the groove bottom of accommodating hole groove, and support column is abutted between the end of screw and fixed block, and elastic part is arranged between support column and fixed block, and has compression pre-tightening force. This connecting structure can avoid direct contact between screw and counter hand, prevent mutual abrasion between both, and can buffer when screw and counter hand relatively move, guarantee the reliability of injection molding machine screw fixation and the stability of injection molding machine injection.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding machine technology, and specifically relates to a connection structure between the screw and the handpiece of an injection molding machine and an injection molding machine. Background Technology

[0002] In the plasticizing and injection system of an injection molding machine, the screw and its counterpart (plasticizing drive shaft or injection cylinder piston rod) are interdependent and work together as core components. Their fitting precision, functional synergy, and wear condition directly determine the plasticizing quality, production stability, and service life of the injection molding machine.

[0003] like Figure 1 As shown, in existing injection molding machines, the screw 1 and its counterpart 2 are typically connected by a spline or flat key. Then, two semi-annular pressure plates 3 press and fix the end of the screw 1 into the receiving groove on the counterpart 2; at this time, the end face of the screw 1 and the end face of the counterpart 2 are in full contact. The normal operation of an injection molding machine often includes two actions: the suction action and the injection action. When the injection molding machine performs the suction action, under the action of the externally applied suction force F1, based on the plastic deformation of each part, the counterpart 2 will retract (towards) the position of the screw 1. Figure 1 The movement to the right of the screw 1 causes a gap (approximately 0.3 mm) between the end face of the screw 1 and the end face of the counterpart 2. When the injection molding machine performs its injection action, the counterpart 2, under the action of the externally applied reverse injection force F2, moves towards the screw 1, causing their end faces to re-contact. Due to cost considerations, the counterpart 2 is generally made of ordinary medium carbon steel, which has a low surface hardness. Under the aforementioned cyclical (squeezing-injection) conditions, the contact surface between the screw 1 and the counterpart 2 experiences impact and wear, making the counterpart 2 particularly prone to premature wear. Once wear occurs between the screw 1 and the counterpart 2, the screw 1's fixing will loosen, affecting not only the injection stability and accuracy of the injection molding machine, but also causing the fixing screw 2 on the semi-ring plate 3 to be subjected to impact loads during each injection, leading to fatigue fracture. Utility Model Content

[0004] To address the aforementioned problems, this utility model discloses a connection structure between an injection molding machine screw and a handpiece, as well as an injection molding machine, to overcome or at least partially solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model discloses a connection structure between an injection molding machine screw and a counterscrew, the connection structure including a screw, an annular pressure plate, a counterscrew, and a buffer structure; wherein, the annular pressure plate is formed by splicing two semi-annular pressure plates; The counterslip has a receiving groove, the end of the screw is inserted into the receiving groove, and the annular pressure plate is sleeved on the shoulder of the screw and fixedly connected to the counterslip. The buffer structure is located within the receiving slot and includes a support column, an elastic element, and a fixing block. The fixing block is fixed to the bottom of the receiving slot, the support column abuts against the end of the screw and the fixing block, and the elastic element is disposed between the support column and the fixing block and has a compression preload.

[0006] Furthermore, the elastic element is a plurality of disc springs arranged in series, which are sleeved on the support column, with one end abutting against the support column and the other end abutting against the fixing block.

[0007] Furthermore, the fixing block has a limiting protrusion or a limiting groove on its end face that is in close contact with the support column, and the support column has a limiting groove or a limiting protrusion that cooperates with the limiting protrusion or the limiting groove, so that the fixing block and the support column can only move axially.

[0008] Furthermore, the fixing block has screw holes, and the fixing block is fixed to the bottom of the receiving groove through the screw holes and fixing screws or fixing bolts.

[0009] Furthermore, the support column and the fixing block are made of high manganese steel, high carbon chromium bearing steel, tungsten carbide-based cemented carbide, or titanium carbide-based cemented carbide.

[0010] Furthermore, the annular pressure plate is fixed to the opposing component by screws or bolts.

[0011] Furthermore, the connection structure also includes a locking ring and an elastic O-ring; The locking ring is sleeved on the screw and threadedly connected to the counterscrew. The locking ring forms an axial compression on one end face of the annular pressure plate, causing the other end face of the annular pressure plate to press against the shoulder of the screw. An annular groove is formed along the circumferential direction on the outer circumferential surface of the annular pressure plate, and the elastic O-ring is located in the annular groove.

[0012] Furthermore, the locking ring sleeve has a fixing part extending axially, and an external thread is formed on the outer circumference of the fixing part, and an internal thread that mates with the external thread is formed on the inner wall of the receiving groove.

[0013] Furthermore, the connection structure also includes set screws or set bolts; The locking ring sleeve has an annular flange extending radially from the end away from the opposing component. The annular flange has a threaded through hole along the axial direction. The set screw or the set bolt is screwed into the threaded through hole and presses against the end face of the opposing component.

[0014] Another aspect of this utility model discloses an injection molding machine, which is provided with the above-described connection structure between the injection molding machine screw and the handpiece.

[0015] The advantages and beneficial effects of this utility model are: In the connection structure of this utility model, by setting a buffer structure between the end face of the screw and the end face of the counterscrew, direct contact between the screw and the counterscrew can be avoided, preventing mutual wear between the screw and the counterscrew, thereby preventing the screw from loosening. Furthermore, the elastic element in the buffer structure can buffer the relative movement of the screw and the counterscrew, preventing the fixing screw on the semi-circular pressure plate from fatigue fracture due to additional impact loads, thus ensuring the reliability of the screw fixing in the injection molding machine and the stability of the injection molding machine. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A partial cross-sectional view of the connection structure between the existing injection molding machine screw and the component; Figure 2 This is a perspective view of the connection structure between the injection molding machine screw and the handpiece in one embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the connection structure between the injection molding machine screw and the handpiece in one embodiment of the present invention; Figure 4 This is a partial cross-sectional view of the connection structure between the injection molding machine screw and the handpiece in another embodiment of the present invention; Figure 5 This is a partial cross-sectional view of the connection structure when the drive shaft is made of plastic.

[0017] In the diagram: 1. Screw; 1-1. Shoulder; 2. Handpiece; 2-1. Receiving slot; 3. Semi-ring pressure plate; 4. Support column; 4-1. Limiting groove; 5. Elastic element; 6. Fixing block; 6-1. Limiting protrusion; 7. Fixing bolt; 8. Bolt; 9. Locking ring; 9-1. Annular flange; 9-2. Fixing part; 10. Elastic O-ring; 11. Set screw; 12. Plasticized drive shaft; 13. Locking nut; 14. Plasticized motor base assembly. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0023] One embodiment of this utility model provides a connection structure between an injection molding machine screw and a counterscrew, such as... Figure 2 and Figure 3 As shown, the connection structure includes a screw 1, an annular pressure plate, a counter assemblies 2, and a buffer structure; wherein the annular pressure plate is formed by splicing two semi-annular pressure plates 3.

[0024] Specifically, a receiving groove 2-1 is formed on the counterpart 2, the end of the screw 1 is inserted into the receiving groove 2-1, the annular pressure plate is sleeved on the shoulder 1-1 of the screw 1 and fixedly connected to the counterpart 2 (that is, the two semi-annular pressure plates 3 are fixedly connected to the counterpart 2 respectively), so that the end of the screw 1 is pressed and fixed in the receiving groove 2-1, thereby realizing the fixed connection between the screw 1 and the counterpart 2.

[0025] Furthermore, the buffer structure is located within the receiving groove 2-1, between the end face of the screw 1 and the end face of the counterscrew 2. The buffer structure includes a support column 4, an elastic element 5, and a fixing block 6. The fixing block 6 is fixed to the bottom of the receiving groove 2-1, and the support column 4 abuts against the end of the screw 1 and the fixing block 6. That is, the support column 4 and the fixing block 6 are provided between the end of the screw 1 and the bottom of the receiving groove 2-1, which avoids direct contact between the end face of the screw 1 and the end face of the counterscrew 2, thereby preventing contact wear between the screw 1 and the counterscrew 2. The elastic element 5 is provided between the support column 4 and the fixing block 6 and has a compression preload, so that the support column 4 is always pressed against the end of the screw 1. In this embodiment, during installation, the fixing block 6 is first placed in the receiving hole groove 2-1 on the opponent 2 and fixed to the bottom of the receiving hole groove 2-1; then the elastic element 5 and the support column 4 are placed in the receiving hole groove 2-1 in sequence, so that the elastic element 5 is located between the support column 4 and the fixing block 6; finally, the screw 1 is inserted into the receiving hole groove 2-1 and pressed and fixed on the opponent 2 by the annular pressure plate.

[0026] It should be noted that during the process of pressing and fixing the end of the screw 1 into the receiving groove 2-1 by the annular pressure plate, the elastic element 5 will be compressed until the end face of the support column 4 and the end face of the fixing block 6 are completely in contact. That is, the screw 1 and the support column 4 and the support column 4 and the fixing block 6 must be tightly abutted to ensure that there is no gap between the screw 1, the support column 4 and the fixing block 6 when the injection molding machine is not working, and to prevent the screw 1 from shaking in the receiving groove 2-1.

[0027] The working process of the connection structure in this embodiment is as follows: When the injection molding machine begins the ejection action, the position of the handpiece 2 relative to the screw 1 is moved backward (towards) Figure 3 (The right-side movement) creates a gap between the handpiece 2 and the screw 1. At this time, under the elastic force of the elastic element 5, the support column 4 automatically compensates for the gap caused by the relative movement of the handpiece 2, so that the end face of the support column 4 and the end face of the screw 1 always remain in contact, while the end face of the support column 4 and the end face of the fixing block 6 are separated. This fundamentally avoids the wear of the end face of the screw 1, and indirectly ensures the reliability of the screw 1 fixing of the injection molding machine, as well as the stability of the injection of the injection molding machine, and reduces the later manual maintenance cost.

[0028] When the injection molding machine begins the injection action, the position of the handpiece 2 relative to the screw 1 moves forward (towards) under the action of the injection force. Figure 3 The screw 1 moves to the left, compressing the elastic element 5 until the end face of the support column 4 and the end face of the fixing block 6 are tightly pressed together. During this process, the elastic force of the elastic element 5 buffers the impact between the support column 4 and the fixing block 6, reducing wear between them and preventing the screw 1 from loosening. This ensures the stability of the injection molding machine. Furthermore, thanks to the intermediate transition function of the fixing block 6, it provides some protection for the hand part 2, preventing damage or replacement. When the fixing block 6 wears out, it can be replaced simply, reducing the operating cost of the injection molding machine. The fixing block 6 also serves as a limiter, ensuring consistent positional accuracy during each injection.

[0029] In summary, in the connection structure of this embodiment, by setting a buffer structure between the end face of the screw and the end face of the counterscrew, direct contact between the screw and the counterscrew can be avoided, preventing mutual wear between the screw and the counterscrew, thereby preventing the screw from loosening. Furthermore, the elastic element in the buffer structure can buffer the relative movement of the screw and the counterscrew, preventing the fixing screw on the semi-circular pressure plate from fatigue fracture due to additional impact loads, thus ensuring the reliability of the injection molding machine screw fixation and the stability of the injection molding machine.

[0030] In this embodiment, the elastic element 5 consists of multiple disc springs arranged in series. These disc springs are sleeved on the support column 4, with one end abutting against the support column 4 and the other end abutting against the fixing block 6. The support column 4 provides radial limiting for the disc springs, ensuring that each disc spring is coaxial and thus guaranteeing stable operation. For example, a trapezoidal platform is formed on the circumference of the support column 4 near the screw 1. One end of the multiple disc springs arranged in series abuts against the trapezoidal platform, and the other end abuts against the end face of the fixing block 6.

[0031] Among them, disc springs can withstand extremely large loads in a small space, have large deformation energy per unit volume, can withstand heavy load pressure, and have good buffering and shock absorption capabilities. In particular, when they are combined in a stacked (series) manner, the effect of absorbing impact and dissipating energy is more significant due to the surface friction resistance, making the buffering and shock absorption effect between the support column 4 and the fixed block 6 better.

[0032] And, as Figure 3 As shown, the fixing block 6 has a limiting protrusion 6-1 on its end face that is in close contact with the support column 4, and the support column 4 has a limiting groove 4-1 that cooperates with the limiting protrusion 6-1. This allows the fixing block 6 and the support column 4 to move only axially, preventing the support column 4 from shaking within the receiving groove 2-1, thereby ensuring the stability of the injection molding machine during the extraction and injection processes. Of course, the positions of the limiting groove 4-1 and the limiting protrusion 6-1 can also be interchanged.

[0033] In other embodiments, a spring groove is formed on the end face of the support column that is close to the fixing block. Multiple disc springs arranged in series can also be arranged in the spring groove, and the radial limit of the disc spring is achieved through the spring groove.

[0034] Of course, the elastic element can also be other elastic devices, such as helical springs, ring springs, etc.

[0035] In this embodiment, as Figure 3 As shown, the fixing block 6 has screw holes. The fixing block 6 is fixed to the bottom of the receiving slot 2-1 through the screw holes and fixing screws or fixing bolts 7, which makes it easier to assemble and fix the fixing block 6 on the matching part 2 or remove it from the matching part 2, and facilitates the replacement of the fixing block 6 when it is worn.

[0036] In addition, the support columns and fixing blocks are made of high manganese steel, high carbon chromium bearing steel, tungsten carbide-based cemented carbide, or titanium carbide-based cemented carbide, which gives the support columns and fixing blocks high hardness and wear resistance, ensuring that they have excellent wear resistance and impact resistance, reducing mutual wear between the two, preventing the screw from loosening, and making the injection molding machine run more stably.

[0037] In addition, such as Figure 3 As shown, the annular pressure plate is fixed to the counterpart 2 by screws or bolts 8, making the assembly and disassembly of the screw 1 and the counterpart 2 more convenient.

[0038] In another embodiment of this utility model, such as Figure 4 As shown, the connecting structure also includes a locking ring 9 and an elastic O-ring 10.

[0039] The locking ring 9 is fitted onto the screw 1 and threadedly connected to the matching part 2. The locking ring 9 forms an axial compression on one end face of the annular pressure plate, causing the other end face of the annular pressure plate to press against the shoulder 1-1 of the screw 1, i.e., the locking ring 9 compresses. Figure 4 Left end face of the middle annular pressure plate Figure 4 The right end face of the annular pressure plate presses the shoulder 1-1 of the screw 1, thereby pressing and fixing the end of the screw 1 into the receiving groove 2-1, thus realizing the fixed connection between the screw 1 and the handpiece 2.

[0040] Understandably, by using the locking ring sleeve 9 to press and fix the semi-ring pressure plate 3, the fixing force on the semi-ring pressure plate 3 is more even, thereby enabling the semi-ring pressure plate 3 to press the shaft shoulder 1-1 of the screw 1 as a whole, preventing additional bending moment from being generated on the screw 1.

[0041] It should be noted that the inner diameter of the locking ring sleeve 9 is larger than the outer diameter of the annular pressure plate, and the inner diameter of the annular pressure plate is not larger than the diameter at the shoulder 1-1 of the screw 1, so that the locking ring sleeve 9 can press the annular pressure plate, and the annular pressure plate can press the shoulder 1-1 of the screw 1.

[0042] An annular groove is formed circumferentially on the outer circumferential surface of the annular pressure plate. Specifically, each of the two semi-annular pressure plates 3 has a semi-annular groove. When the two semi-annular pressure plates 3 encircle the screw 1, the two semi-annular grooves combine to form an annular groove. The elastic O-ring 10 is located within the annular groove. Due to the elastic force of the elastic O-ring 10, a radial clamping force is generated on the annular pressure plate, causing the two semi-annular pressure plates 3 to tightly hold the screw 1. The elastic O-ring 10 is made of silicone or rubber. Silicone and rubber are inexpensive and readily available, thus reducing the manufacturing cost of the connection structure. Of course, the elastic O-ring 10 can also be made of other materials, such as polymer elastic materials, which are also within the protection scope of this utility model.

[0043] When assembling or disassembling the screw 1 and the counterscrew 2, the two semi-ring pressure plates 3 are pressed tightly onto the screw 1 by the elastic O rings 10, thereby achieving pre-fixation of the semi-ring pressure plates 3 and the screw 1, effectively preventing the semi-ring pressure plates 3 from falling off the screw 1, and improving the convenience of installation and disassembly.

[0044] At the same time, the elastic force of the elastic O-ring 10 can make the circle formed by the two semi-ring pressure plates 3 coaxial with the screw 1, realize the centering of the two semi-ring pressure plates 3 and the screw 1, and thus make the force between the shoulders 1-1 of the semi-ring pressure plates 3 and the screw 1 more uniform.

[0045] The assembly steps for this connection structure are as follows: First, the locking ring 9 is put onto the screw 1. Then, the two semi-ring pressure plates 3 are wrapped around the screw 1, and the elastic O-ring 10 is put onto the two semi-ring pressure plates 3. Then, the end of the screw 1 is inserted into the receiving hole groove 2-1 on the counterpart 2. Finally, the locking ring 9 is fixed on the counterpart 2 to achieve relative fixation between the screw 1 and the counterpart 2.

[0046] Understandably, by setting a locking ring sleeve 9 to press and fix the semi-ring pressure plate 3, and by fitting an elastic O-ring 10 on the outer circumference of the semi-ring pressure plate 3, the elastic O-ring 10 exerts a pre-pressure effect on the semi-ring pressure plate 3, thereby making the two semi-ring pressure plates 3 tightly hug the screw 1. In this way, on the one hand, when installing or removing the semi-ring pressure plate 3, it prevents the semi-ring pressure plate 3 from easily falling off the screw 1, which greatly facilitates the installation and removal work. On the other hand, it can fix the semi-ring pressure plate 3 symmetrically at the shoulder 1-1 of the screw 1, which fully ensures the alignment of the semi-ring pressure plate 3 and the shoulder 1-1 of the screw 1, thereby indirectly ensuring the uniformity of the contact area between the end faces of the semi-ring pressure plate 3 and the shoulder 1-1 of the screw 1, realizing more uniform pressure on the shoulder 1-1 of the semi-ring pressure plate 3 and the screw 1, and improving the bearing capacity and service life of the semi-ring pressure plate 3 and the screw 1.

[0047] And, as Figure 4As shown, the locking ring sleeve 9 extends axially with a fixing part 9-2. An external thread is formed on the outer circumference of the fixing part 9-2, and an internal thread that mates with the external thread is formed on the inner wall of the receiving groove 2-1. When the locking ring sleeve 9 and the clamping part 2 are tightened and fixed using the threaded structure, the locking ring sleeve 9 can generate a uniform clamping force on the two semi-ring pressure plates 3, ensuring more even force distribution on the semi-ring pressure plates 3 and eliminating problems of uneven force distribution or insufficient preload. This makes the fixing of the screw 1 and the clamping part 2 more stable and reliable. Simultaneously, the threaded connection between the locking ring sleeve 9 and the clamping part 2 makes assembly and disassembly more convenient, reducing manual maintenance costs. It should be noted that the inner diameter of the fixing part 9-2 needs to be larger than the outer diameter of the semi-ring pressure plate 3.

[0048] In addition, such as Figure 4 As shown, the connection structure also includes a set screw 11 or a set bolt.

[0049] The locking ring sleeve 9 has an annular flange 9-1 extending radially from the end away from the opposing part 2. The outer diameter of the annular flange 9-1 is larger than the groove diameter of the receiving slot 2-1. The annular flange 9-1 has a threaded through hole along the axial direction. The set screw 11 or set bolt is screwed into the threaded through hole and pressed against the end face of the opposing part 2, so that the locking ring sleeve 9 cannot rotate. This achieves circumferential limiting of the locking ring sleeve 9, effectively preventing the loosening caused by the rotation of the locking ring sleeve 9 due to vibration generated during long-term operation of the injection molding machine, thereby ensuring the stability of the connection between the screw 1 and the opposing part 2.

[0050] Furthermore, the locking ring sleeve 9 has multiple threaded through holes, which are evenly distributed along its circumference. This ensures a more uniform force exerted on the locking ring sleeve 9 by the set screw 11 or set bolt, preventing additional bending moments caused by localized stress on the locking ring sleeve 9, thereby extending its service life. For example, as... Figure 4 As shown, there are two threaded through holes, which are symmetrically arranged radially along the locking ring sleeve 9.

[0051] In one specific embodiment, the handpiece 2 is a plasticizing drive shaft 12, that is, the screw 1 is connected to the plasticizing drive shaft 12.

[0052] like Figure 5 As shown, the plasticizing drive shaft 12 is fixed to the plasticizing motor base assembly 14 by the locking nut 13. The plasticizing drive shaft 12 has a receiving groove 2-1. A buffer structure is installed in the receiving groove 2-1. The end of the screw 1 is inserted into the receiving groove 2-1 and is pressed and fixed to the plasticizing drive shaft 12 by the annular pressure plate and screws or bolts 8, ensuring that the end face of the screw 1 and the end face of the buffer structure are completely in contact, thereby achieving safe fixing of the injection molding machine screw 1.

[0053] In another embodiment of this utility model, an injection molding machine is provided, which is equipped with the connection structure between the injection molding machine screw and the handpiece as described in the above embodiment, and has the advantages of good operational stability and long service life.

[0054] The above description is merely a specific embodiment of this utility model. Under the teachings of this utility model, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this utility model, and the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A connection structure between an injection molding machine screw and a counterscrew, characterized in that, The connecting structure includes a screw, an annular pressure plate, a counterslip, and a buffer structure; wherein the annular pressure plate is formed by splicing two semi-annular pressure plates. The counterslip has a receiving groove, the end of the screw is inserted into the receiving groove, and the annular pressure plate is sleeved on the shoulder of the screw and fixedly connected to the counterslip. The buffer structure is located within the receiving slot and includes a support column, an elastic element, and a fixing block. The fixing block is fixed to the bottom of the receiving slot, the support column abuts against the end of the screw and the fixing block, and the elastic element is disposed between the support column and the fixing block and has a compression preload.

2. The connection structure between the injection molding machine screw and the counterscrew according to claim 1, characterized in that, The elastic element is a plurality of disc springs arranged in series. The plurality of disc springs arranged in series are sleeved on the support column, with one end abutting against the support column and the other end abutting against the fixing block.

3. The connection structure between the injection molding machine screw and the counterscrew according to claim 1, characterized in that, The fixing block has a limiting protrusion or a limiting groove on its end face that is in close contact with the support column, and the support column has a limiting groove or a limiting protrusion that cooperates with the limiting protrusion or the limiting groove, so that the fixing block and the support column can only move axially.

4. The connection structure between the injection molding machine screw and the counterscrew according to claim 1, characterized in that, The fixing block has screw holes, and the fixing block is fixed to the bottom of the receiving groove through the screw holes and fixing screws or fixing bolts.

5. The connection structure between the injection molding machine screw and the counterscrew according to claim 1, characterized in that, The support column and the fixing block are made of high manganese steel, high carbon chromium bearing steel, tungsten carbide-based cemented carbide, or titanium carbide-based cemented carbide.

6. The connection structure between the injection molding machine screw and the counterscrew according to any one of claims 1 to 5, characterized in that, The annular pressure plate is fixed to the opposing component by screws or bolts.

7. The connection structure between the injection molding machine screw and the counterscrew according to any one of claims 1 to 5, characterized in that, The connection structure also includes a locking ring and an elastic O-ring; The locking ring is sleeved on the screw and threadedly connected to the counterscrew. The locking ring forms an axial compression on one end face of the annular pressure plate, causing the other end face of the annular pressure plate to press against the shoulder of the screw. An annular groove is formed along the circumferential direction on the outer circumferential surface of the annular pressure plate, and the elastic O-ring is located in the annular groove.

8. The connection structure between the injection molding machine screw and the counterscrew according to claim 7, characterized in that, The locking ring sleeve has a fixing part extending axially, and an external thread is formed on the outer circumference of the fixing part. The inner wall of the receiving groove has an internal thread that mates with the external thread.

9. The connection structure between the injection molding machine screw and the counterscrew according to claim 7, characterized in that, The connection structure also includes set screws or set bolts; The locking ring sleeve has an annular flange extending radially from the end away from the opposing component. The annular flange has a threaded through hole along the axial direction. The set screw or the set bolt is screwed into the threaded through hole and presses against the end face of the opposing component.

10. An injection molding machine, characterized in that, The injection molding machine is provided with a connection structure between the injection molding machine screw and the handpiece as described in any one of claims 1 to 9.

Images