Injection molding screw structure of injection molding machine

Abstract

The utility model relates to the technical field of injection molding machines, in particular to an injection molding screw structure of an injection molding machine. According to the technical scheme, a screw body of a connecting module is installed in an extrusion pipe, a spline is arranged at the tail end of the screw body, a shaft sleeve is arranged at the position, located at the spline of the screw body, of the connecting module in a covering mode, a connecting rod is connected to the shaft sleeve, and a fixing module is installed at the position, close to a driven gear, of the connecting rod; the fixing module is provided with an end cover, a pressing plate is installed on the rotating seal in a limiting mode through a limiting rod, the pressing plate is fixed to the connecting rod, a partition plate is arranged on the portion, located on the connecting rod, between the pressing plate and the end cover in a sleeving mode, and springs are arranged between the partition plate and the pressing plate and between the partition plate and the end cover. According to the utility model, the transmission connection design of the screw and the power equipment is improved, and the mounting and dismounting processes of the screw are simplified, so that the problem that a motor and the screw need to be frequently connected through a coupler when the existing device is used is solved, and the complexity and the time cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to an injection molding screw structure of an injection molding machine. Background Art

[0002] An injection molding machine is a molding device that uses a plastic molding mold to make plastic products of various shapes from thermoplastics or thermosetting plastics. During the injection operation, the injection screw transfers the molten plastic along the injection screw and injects it.

[0003] After searching, the patent with patent announcement number CN220373841U discloses an injection molding screw structure. Although the device can adapt to screw bodies of different sizes through the combination of a cover plate and a sub-cover plate when in use, the device still needs to connect the screw to a power device such as a motor when in use. Most of the connections are made through a coupling, and the screw needs to be installed and removed repeatedly. Since each time the screw is replaced or installed, it needs to be connected to a power device such as a motor through a coupling, this process often involves steps such as alignment and tightening of multiple components, which increases the complexity and time cost of the operation. Especially when the production line frequently changes molds or adjusts production parameters, this repetitive installation and disassembly work will greatly reduce production efficiency. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an injection screw structure for an injection molding machine, which solves the problems raised in the background art.

[0005] The utility model solves the above-mentioned technical problems as follows:

[0006] An injection molding screw structure of an injection molding machine, comprising an extrusion tube and a connecting module, wherein the screw body of the connecting module is installed in the extrusion tube;

[0007] The end of the screw body is provided with a spline, the connecting module is located at the spline of the screw body and is provided with a sleeve, a keyway is provided in the sleeve, the sleeve is clamped on the spline of the screw body through the keyway, a connecting rod is connected to the sleeve, and a driven gear is provided at the end of the connecting rod away from the sleeve, and a fixing module is installed on the connecting rod near the driven gear;

[0008] The fixed module is provided with an end cover, and a pressure plate is installed on the rotating seal through a limit rod. The pressure plate is fixed on the connecting rod, and a partition is provided on the connecting rod between the pressure plate and the end cover, and springs are provided between the partition, the pressure plate and the end cover, and buffering is performed by two sections of springs.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the connection module is provided with a driving gear, which is located at the output end of the external power device. The external power device is connected to the driven gear through the driving gear, and then the connecting rod is driven to rotate through the external power device.

[0011] The beneficial effects of adopting the above further scheme are:

[0012] Through the cooperation of the driving gear and the driven gear, the external power equipment can efficiently transmit power to the connecting rod. This gear transmission method has efficient energy transmission characteristics, can reduce friction loss, ensure that energy loss during the transmission process is minimized, and improve overall efficiency. The gear transmission method ensures that the connecting rod remains stable during rotation, avoiding slippage or unevenness that may occur during power transmission. The driving gear and the driven gear work closely together to provide a constant torque output, thereby ensuring the stable operation of the screw. Compared with other transmission methods (such as belt or chain drive), gear transmission has a smaller volume, and the power equipment, driving gear and driven gear can be arranged closely together, saving equipment installation space and contributing to the compactness of the overall design of the injection molding machine.

[0013] Furthermore, the screw body and the connecting rod are connected through a keyway and a spline transmission in the shaft sleeve.

[0014] The beneficial effects of adopting the above further scheme are:

[0015] The spline and keyway structure provides a larger contact area, enabling more efficient torque transmission and reducing energy loss compared to cylindrical pins or other connection methods. Because the keyway and spline fit tightly together, torque is evenly distributed during transmission, eliminating localized stress concentrations. This design ensures high transmission efficiency even under high loads, synchronizes the rotation of the connecting rod and the screw body, and prevents slippage or idling. Furthermore, the sleeve 301 is designed as a separate, removable module, enabling assembly and disassembly through simple insertion or removal. Because the screw body and connecting rod are connected through the keyway and spline in the sleeve, complex disassembly tools or equipment are not required, making maintenance and replacement easier. Compared to traditional welding or fixed pin connections, the spline and keyway are mechanically engaged and do not involve a permanent connection. Therefore, when disassembly is required, destructive disassembly is eliminated; simply remove the sleeve to release the transmission connection between the screw body and connecting rod. The simple connection structure allows for quick assembly and disassembly, requiring only the sleeve to be axially slid in or out, saving maintenance time. The splines and keyways have clear positioning features, ensuring accurate alignment during reassembly, eliminating installation errors. Reassembly can be completed by simply aligning the keyways and splines, eliminating the need for complex marking or positioning operations during disassembly.

[0016] Furthermore, a limiting block is provided at one end of the limiting rod away from the end cover, and the pressing plate is slidingly mounted on the pressing plate through the limiting block.

[0017] The beneficial effects of adopting the above further scheme are:

[0018] The stopper, fixed to the end of the limit rod, restricts the sliding range of the pressure plate. This means the pressure plate can only slide in a specific direction and range, preventing uncontrolled displacement or shaking. This effectively improves system stability under high loads and high speeds, reducing deflection and wear caused by sliding. The stopper ensures that the pressure plate always maintains a precise relative position relative to the limit rod during operation, preventing deflection caused by vibration or external forces, and enhancing the reliability of the entire system. The stopper acts as a mechanical limiter, precisely controlling the sliding travel of the pressure plate on the limit rod. This design ensures that the pressure plate always stays within the set range during operation and prevents sliding beyond the operating range, thus ensuring the proper operation of the system. Without the limiter, the pressure plate could slide excessively due to external pressure or impact, causing improper mating of the screw or other critical components. The stopper effectively prevents this, ensuring that the sliding distance remains within a safe range.

[0019] Furthermore, a rotary seal is provided in the end cover, and the screw body is rotatably installed in the end cover through the rotary seal.

[0020] The beneficial effects of adopting the above further scheme are:

[0021] The rotary seal design ensures a strong seal even during screw rotation. For equipment like injection molding machines that handle molten materials, sealing is crucial, effectively preventing leakage of internal materials or liquids, potentially contaminating the equipment or the working environment. The rotary seal not only prevents internal material leakage but also blocks dust and impurities from entering the system, protecting the screw and other critical components from external contamination, thereby extending the life of the equipment.

[0022] Furthermore, the extrusion tube is provided with bolts, and the end cover of the fixing module is installed on the extrusion tube and then locked and fixed by bolts and nuts.

[0023] The beneficial effects of adopting the above further scheme are:

[0024] The bolt and nut locking system provides high mechanical strength, ensuring a stable and secure connection between the module's end cap and the extrusion tube. In high-load, high-pressure equipment like injection molding machines, a strong mechanical connection is crucial for proper operation. The bolt and nut locking system prevents the end cap from loosening or shifting due to vibration or stress during operation, ensuring long-term system stability.

[0025] The utility model provides an injection molding screw structure for an injection molding machine. It has the following beneficial effects:

[0026] The splines of the screw body cooperate with the keyways in the sleeve to form a stable transmission connection, making the transmission of the screw and connecting rod smoother and reducing the possibility of wear and loosening during the transmission process.

[0027] The external power device transmits power through the driving gear and the driven gear, thereby driving the connecting rod and the screw body to rotate. This design ensures efficient power transmission and improves the working efficiency of the injection screw.

[0028] A partition is designed between the pressure plate and the end cover, and two springs are used for buffering. This design effectively reduces stress concentration between the sleeve and the screw body, reduces impact force, and thus extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0030] In the attached figure:

[0031] Figure 1 This is a schematic diagram of the appearance of the utility model;

[0032] Figure 2 This is a schematic diagram of the explosion structure of the utility model;

[0033] Figure 3 This is a schematic diagram of the appearance of the shaft sleeve of the utility model;

[0034] Figure 4 This is a schematic diagram of the explosion structure of the fixed module of the utility model.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1. Extrusion tube; 101. Bolt; 102. Nut; 2. Fixing module; 201. Pressure plate; 202. Limit block; 203. Partition; 204. Spring; 205. Rotary seal; 206. End cover; 207. Limit rod; 3. Connecting module; 301. Bushing; 3011. Keyway; 3012. Guide shaft; 302. Connecting rod; 303. Driving gear; 304. Driven gear; 305. Spline; 306. Screw body. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figures 1 to 4 As shown, the embodiment provided by the utility model:

[0039] Example 1

[0040] An injection molding screw structure for an injection molding machine includes an extrusion tube 1 and a connection module 3. A screw body 306 of the connection module 3 is installed in the extrusion tube 1. A spline 305 is provided at the end of the screw body 306. The connection module 3 is located at the spline 305 of the screw body 306 and is covered with a sleeve 301. A keyway 3011 is provided in the sleeve 301. The sleeve 301 is clamped to the spline 305 of the screw body 306 through the keyway 3011. A connecting rod 302 is connected to the sleeve 301. The screw body 306 and the connecting rod 302 are transmission-connected via the keyway 3011 and the spline 305 in the sleeve 301. The spline 305 and keyway 3011 structure can provide a larger contact area, which can more efficiently transmit torque and reduce energy loss compared to cylindrical pins or other connection methods. Because the keyway 3011 and the spline 305 can be tightly matched, the torque is evenly distributed during the transmission process and no local stress concentration occurs. This design ensures that high transmission efficiency can be maintained under high load conditions, so that the rotation of the connecting rod 302 and the screw body 306 is synchronized, avoiding slippage or idling. In addition, the sleeves 301301 are designed as independent detachable modules, which can be disassembled and assembled by simple insertion or removal operations. Since the transmission connection between the screw body 306 and the connecting rod 302 is achieved through the keyway 3011 and the spline 305 in the sleeve 301, no complicated disassembly tools or equipment are required, which facilitates maintenance and replacement. Unlike traditional welding or fixed pin shaft connections, the spline 305 and the keyway 3011 are mechanically engaged and do not involve permanent connection. Therefore, when disassembly is required, there is no need to perform destructive disassembly operations. Simply remove the sleeve 301 to release the transmission connection between the screw body 306 and the connecting rod 302. Due to the simple connection structure, the disassembly and assembly process is quick. The operation can be completed by simply sliding the sleeve 301 out or in along the axial direction, saving maintenance time. At the same time, the spline 305 and the keyway 3011 have clear positioning characteristics, which can ensure accurate alignment during the reassembly process and prevent installation errors. There is no need to perform complex marking or positioning operations during disassembly. When reassembling, it can be completed by directly aligning the keyway 3011 and the spline 305, which greatly simplifies the operation process. The end of the connecting rod 302 facing away from the sleeve 301 is provided with a driven gear 304, and the connecting module 3 is provided with a driving gear 303. The driving gear 303 is located at the output end of the external power device. The external power device is connected to the driven gear 304 through the driving gear 303, and then drives the connecting rod 302 to rotate through the external power device. Through the close cooperation of the driving gear 303 and the driven gear 304, the external power device can efficiently transmit power to the connecting rod 302. This gear transmission method has efficient energy transfer characteristics, which can effectively reduce friction loss, ensure that the energy loss during the transmission process is reduced to a minimum, thereby improving overall efficiency. In addition, the gear transmission can also ensure that the connecting rod 302 remains stable during rotation, avoiding slippage or unevenness that may occur during power transmission.The tight fit between the driving gear 303 and the driven gear 304 provides constant torque output, thereby ensuring stable operation of the screw. Compared with other transmission methods (such as belt or chain drives), gear transmission is smaller in size and can closely arrange the power device, driving gear 303, and driven gear 304 together, saving equipment installation space and contributing to the compactness of the overall design of the injection molding machine. A fixing module 2 is installed on the connecting rod 302 near the driven gear 304.

[0041] Example 2

[0042] In order to ensure stable transmission between the sleeve 301 and the screw body 306, for example, Figures 1 to 4As shown, the present invention further comprises: a fixed module 2 equipped with an end cap 206, which is internally provided with a rotary seal 205. The screw body 306 is rotatably mounted within the end cap 206 via the rotary seal 205. The design of the rotary seal 205 ensures a good seal even while the screw rotates. For equipment that processes molten materials, such as injection molding machines, sealing is crucial, effectively preventing leakage of internal materials or liquids, thereby contaminating the equipment or the working environment. The rotary seal 205 not only prevents internal material leakage but also blocks external dust and impurities from entering the system, protecting the screw body 306 and other key components from external contamination, thereby extending the service life of the equipment. The extrusion tube 1 is provided with a bolt 101. After being mounted on the extrusion tube 1, the end cap 206 of the fixed module 2 is secured by the bolt 101 and nut 102. The locking method of the bolt 101 and nut 102 provides high mechanical strength, ensuring a stable and secure connection between the end cap 206 of the fixed module 2 and the extrusion tube 1. In high-load, high-pressure equipment such as injection molding machines, a secure mechanical connection is crucial to ensuring proper operation. The locking mechanism between bolt 101 and nut 102 prevents end cap 206 from loosening or shifting due to vibration or stress during operation, ensuring the system's long-term stability. A pressure plate 201 is mounted on the rotating seal 205, secured by a stopper rod 207. A stopper block 202 is located at the end of the stopper rod 207 facing away from the end cap 206. The pressure plate 201 is slidably mounted on the pressure plate 201 by the stopper block 202. The stopper block 202, fixed to the end of the stopper rod 207, restricts the sliding range of the pressure plate 201. This means that the pressure plate 201 can only slide in a specific direction and range, preventing uncontrolled displacement or shaking. This design effectively improves the system's stability under high loads and high speeds, reducing deflection and wear caused by sliding. The presence of the stopper block 202 ensures that the pressure plate 201 always maintains a precise relative position to the stopper rod 207 during operation, preventing deflection due to vibration or external forces and making the entire system more reliable. Limit block 202 acts as a mechanical limiter, precisely controlling the sliding travel of pressure plate 201 on limit rod 207. This design ensures that pressure plate 201 remains within the set range during operation and prevents it from sliding beyond the operating range, thus ensuring proper operation of the system. Without the restraint of limit block 202, pressure plate 201 could slide excessively due to external pressure or impact, potentially causing misalignment of the screw or other key components.The limit block 202 effectively prevents this situation, ensuring that the sliding distance is always within a safe range. The pressure plate 201 is fixed on the connecting rod 302, and a partition 203 is provided between the pressure plate 201 and the end cover 206 on the connecting rod 302. Springs 204 are provided between the partition 203 and the pressure plate 201 and the end cover 206. The two sections of springs 204 are used for buffering, and the elastic force of the spring 204 is used to press the sleeve 301 so that it is sleeved on the spline 305 of the screw body 306.

[0043] Working principle:

[0044] The external power device is connected to the driven gear 304 via the driving gear 303, driving the connecting rod 302 to rotate. Since the connecting rod 302 is connected to the spline 305 of the screw body 306 via the shaft sleeve 301, the rotational power is transmitted from the connecting rod 302 to the screw body 306, driving the screw body 306 to perform the injection molding operation.

[0045] The sleeve 301 is tightly coupled to the spline 305 of the screw body 306 via the keyway 30111, ensuring efficient power transmission. This spline 305-keyway 3011 connection ensures that the relative position between the screw body 306 and the sleeve 301 remains stable, preventing slippage or loosening during transmission.

[0046] The pressure plate 201 is fixed on the connecting rod 302. When power is transmitted, the pressure plate 201 rotates with the connecting rod 302. A partition 203 is provided between the pressure plate 201 and the end cover 206, and springs 204 are installed on both sides of the partition 203. These springs 204 will generate a certain elastic force at the upper end during operation. The elastic force of the spring 204 is transmitted to the sleeve 301 through the pressure plate 201 and the partition 203, ensuring that the sleeve 301 is always tightly pressed on the spline 305 of the screw body 306. The core of this design is that the pre-pressure of the spring 204 ensures that the sleeve 301 and the screw body 306 are always in close contact, thereby avoiding loosening or falling off due to vibration or load changes. The existence of the spring 204 is not only to press the sleeve 301, but also to play a role in buffering and dispersing stress. During operation, the injection molding machine may be subjected to various loads and vibrations. The stress directly applied to the screw, connecting rod 302, and sleeve 301 may cause wear or fatigue damage to the parts. However, through the elastic buffering of the two-stage spring 204, these impact forces and stresses are effectively dispersed, reducing local stress concentration in the screw system and thus extending the service life of the entire structure. Because the spring 204 has certain compression and recovery capabilities, it can automatically adjust the pressure on the sleeve 301 according to changes in the load during operation. In other words, when the load increases, the spring 204 will automatically compress and absorb some of the impact force; when the load decreases, the spring 204 will return to its initial state, ensuring that the sleeve 301 remains pressed against the spline 305 of the screw, thereby ensuring the continued stability of the entire transmission system.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An injection molding screw structure for an injection molding machine, comprising an extrusion tube (1) and a connecting module (3), wherein the screw body (306) of the connecting module (3) is installed in the extrusion tube (1), characterized in that: The end of the screw body (306) is provided with a spline (305), the connecting module (3) is located at the spline (305) of the screw body (306) and is provided with a sleeve (301), a keyway (3011) is provided in the sleeve (301), the sleeve (301) is clamped on the spline (305) of the screw body (306) through the keyway (3011), a connecting rod (302) is connected to the sleeve (301), a driven gear (304) is provided at one end of the connecting rod (302) away from the sleeve (301), and a fixing module (2) is installed on the connecting rod (302) near the driven gear (304); The invention also includes a rotating seal (205), the fixed module (2) is provided with an end cover (206), a pressure plate (201) is installed on the rotating seal (205) through a limiting rod (207), the pressure plate (201) is fixed on the connecting rod (302), a partition (203) is provided between the pressure plate (201) and the end cover (206) and is sleeved on the connecting rod (302), and springs (204) are provided between the partition (203), the pressure plate (201) and the end cover (206), and buffering is performed by two sections of springs (204).

2. The injection molding screw structure of an injection molding machine according to claim 1, characterized in that: The connecting module (3) is provided with a driving gear (303), and the driving gear (303) is located at the output end of the external power device. The external power device is connected to the driven gear (304) through the driving gear (303), and then the connecting rod (302) is driven to rotate through the external power device.

3. The injection molding screw structure of an injection molding machine according to claim 1, characterized in that: The screw body (306) and the connecting rod (302) are connected to each other through a keyway (3011) and a spline (305) in the shaft sleeve (301).

4. The injection molding screw structure of an injection molding machine according to claim 1, characterized in that: A limiting block (202) is provided at one end of the limiting rod (207) away from the end cover (206), and the pressing plate (201) is slidably mounted on the pressing plate (201) via the limiting block (202).

5. The injection molding screw structure of an injection molding machine according to claim 4, characterized in that: A rotary seal (205) is provided in the end cover (206), and the screw body (306) is rotatably mounted in the end cover (206) via the rotary seal (205).

6. The injection molding screw structure of an injection molding machine according to claim 1, characterized in that: The extrusion tube (1) is provided with a bolt (101), and the end cover (206) of the fixing module (2) is mounted on the extrusion tube (1) and then locked and fixed by the bolt (101) and the nut (102).

Images