Connecting device for screw rod and transmission shaft of injection machine

Abstract

The utility model discloses an injection machine screw and transmission shaft connecting device which comprises a transmission shaft seat and an injection screw arranged at the front end of the transmission shaft seat, the front end of the transmission shaft seat is connected with the injection screw in an inserting mode through an inserting hole, and the inserting hole is formed in the center of the front end of the transmission shaft seat. Key strips are clamped in the rear sides of the upper end and the lower end of the injection screw rod, the two key strips are clamped in the inserting holes through key grooves, the upper end and the lower end of the injection screw rod are sleeved with half-moon clamping rings, and the two half-moon clamping rings are fixedly connected to the front end of the transmission shaft base through bolts and located at the front ends of the two key strips correspondingly; through cooperation of the tensioning abutting plate and the tensioning sliding block, outward expansion and inward shrinkage of the key strip in the telescopic groove are achieved, it is ensured that the key strip can adapt to axis changes of the injection screw in the assembling and using process, the stable fixing effect is provided, and the key strip is used for limiting the relative position between the transmission shaft base and the injection screw in the rotating process and ensuring accurate transmission.

Description

Technical Field

[0001] The utility model belongs to the relevant technical field, and in particular relates to a connecting device of a screw rod and a transmission shaft of an injection machine. Background Art

[0002] In the plastic injection molding process, the screw is a key component that is responsible for melting the plastic particles and pushing them into the mold. Traditionally, the connection between the screw and the transmission system relies on machining and threaded connection. Although this connection method is reliable, it has the problem of loose connection. With the growth of demand for plastic products and the continuous development of injection molding technology, higher requirements are placed on the stability of the connection between the screw and the transmission system.

[0003] Existing screw connection technologies usually include direct threaded connection, key connection or the use of fasteners such as bolts and pins. However, these methods have some limitations in practical applications: threaded connection is prone to thread damage or loosening due to vibration and thermal expansion during long-term use; although key connection can provide better torque transmission, it is not enough for precise positioning of the screw.

[0004] Therefore, it is necessary to develop a new type of screw and drive shaft connection device to solve the problem of poor connection stability in the prior art. The device should be able to achieve fast installation and disassembly while ensuring high torque transmission, and have good reliability to meet the requirements of modern high-speed and high-precision injection molding. Utility Model Content

[0005] The utility model aims to provide a device for connecting a screw rod and a transmission shaft of an injection machine, so as to solve the problem that the thread connection proposed in the above background technology is easy to cause thread damage or loosening due to vibration and thermal expansion during long-term use.

[0006] To achieve the above purpose, the utility model provides the following technical solution: a device for connecting a screw rod and a transmission shaft of an injection machine, comprising:

[0007] A transmission shaft seat and an injection screw arranged at the front end of the transmission shaft seat;

[0008] The front end of the transmission shaft seat is plugged with an injection screw through a plug hole, the plug hole is opened inside the center of the front end of the transmission shaft seat, the rear sides of the upper and lower ends of the injection screw are clamped with key strips, the two key strips are clamped in the plug hole through key slots, the upper and lower ends of the injection screw are sleeved with half-moon clamp rings, the two half-moon clamp rings are fixedly connected to the front end of the transmission shaft seat by bolts, and are respectively located at the front ends of the two key strips;

[0009] A telescopic groove is provided inside the end of the key bar away from the injection screw, and an opening is provided forward on the lower side of the front end of the telescopic groove; a tensioning plate is slidably connected inside the telescopic groove near one end of the injection screw, and the tensioning plate passes through the front end of the key bar forward; a tensioning slider is slidably connected inside the telescopic groove away from one end of the injection screw, and the tensioning slider passes through the key bar away from the injection screw; the tensioning plate is fixedly connected to a limiting block on the rear side near one end of the injection screw; the telescopic groove is connected to the limiting groove on the rear side near one end of the injection screw, and the limit block is slidably connected inside the limit block.

[0010] Preferably, a groove is provided inside the upper side of the front end opening of the telescopic slot, and the tensioning plate can be pulled forward through the groove, and the pulling distance is limited by the limit block and the limit groove.

[0011] Preferably, the fitting surfaces of the tensioning plate and the tensioning slider are both inclined, and the distance between the front ends of the two fitting surfaces and the axis of the injection screw is greater than the distance between the rear ends of the two fitting surfaces and the axis of the injection screw.

[0012] Preferably, the tensioning slider can protrude from the outside of the key strip and fit with the inner wall of the plug-in hole, and the tensioning abutment plate can protrude from the outside of the key strip and fit with the outer wall of the rear end of the half-moon clamp.

[0013] Preferably, a connecting block is fixedly connected to the rear end of the half-moon retaining ring close to one side of the injection screw, a locking block is fixedly connected to the rear side of the connecting block away from the injection screw, and a knocking block is fixedly connected to the outside of the half-moon retaining ring away from the injection screw. The connecting block and the locking block are both clamped in the interior of the transmission shaft seat through a pre-tightening groove, and the pre-tightening groove is opened in the interior of the front end of the transmission shaft seat and is connected to the interior of the plug hole.

[0014] Preferably, the front end surface of the locking block and the front end inner wall of the pre-tightening slot are both arranged in a counterclockwise spiral and forward, and the locking block can be smoothly inserted into the pre-tightening slot.

[0015] Preferably, the locking block and the pre-tightening slot can be locked with each other by knocking the knocking block clockwise, and after locking, the bolt hole located inside the half-moon retaining ring can be aligned with the threaded hole located inside the front end of the transmission shaft seat.

[0016] Compared with the prior art, the utility model provides a device for connecting a screw rod and a transmission shaft of an injection molding machine, which has the following beneficial effects:

[0017] 1. A new type of injection machine screw and drive shaft connection device is designed, wherein a telescopic groove is provided inside the end of the key bar away from the injection screw, an opening is provided on the lower side of the front end of the telescopic groove, a tensioning plate is slidably connected inside the end close to the injection screw, and a tensioning slider is slidably connected inside the telescopic groove away from the end of the injection screw. The inclined fitting surface design of the tensioning plate and the tensioning slider realizes the outward expansion and inward contraction of the key bar in the telescopic groove through the cooperation of the tensioning plate and the tensioning slider, ensuring that the axis line of the injection screw can be adaptively changed during assembly and use, providing a stable fixing effect, and limiting the relative position between the drive shaft seat and the injection screw during rotation to ensure precise transmission.

[0018] 2. The rear end of the half-moon retaining ring is fixedly connected to a connecting block near one side of the injection screw, and the rear side of the connecting block is fixedly connected to a locking block. The front end surface of the locking block and the front end inner wall of the pre-tightening slot are both arranged counterclockwise and spirally forward to achieve rotational interlocking between the locking block and the pre-tightening slot. At the same time, a secondary fixing method of bolts and threaded holes is adopted, thereby improving the stability of the connection, improving the installation accuracy, and facilitating later maintenance and replacement. These technical points together constitute a solution with compact structure, easy installation and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the screw and transmission shaft connecting device of the injection machine of the present utility model.

[0020] Figure 2 It is an exploded schematic diagram of the connection device between the screw and the transmission shaft of the injection machine of the utility model.

[0021] Figure 3 It is a schematic diagram of the internal connection structure of the key bar of the utility model.

[0022] Figure 4 It is a schematic diagram of the half-moon clamp connection structure of the utility model.

[0023] Figure 5 It is a schematic diagram of the internal structure of the transmission shaft seat of the utility model.

[0024] Figure 6 For the utility model Figure 2 Enlarged schematic diagram at point A in the middle.

[0025] In the figure: 1. Drive shaft seat; 2. Plug hole; 3. Injection screw; 4. Key strip; 5. Keyway; 6. Half-moon retaining ring; 7. Telescopic slot; 8. Tensioning plate; 9. Tensioning slider; 10. Limit block; 11. Limit slot; 12. Connecting block; 13. Locking block; 14. Knocking block; 15. Pre-tightening slot. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The utility model provides Figure 1 and Figure 2 The screw and transmission shaft connecting device of an injection machine shown in the figure comprises:

[0028] A transmission shaft seat 1 and an injection screw 3 arranged at the front end of the transmission shaft seat 1;

[0029] An injection screw 3 is plugged into the front end of the transmission shaft seat 1 through the plug hole 2. The plug hole 2 is opened inside the center of the front end of the transmission shaft seat 1. The injection screw 3 passes power through the transmission shaft seat 1. Key strips 4 are clamped inside the rear sides of the upper and lower ends of the injection screw 3. The two key strips 4 are clamped in the plug hole 2 through the key groove 5. The injection screw 3 is clamped in the plug hole 2 through the key strip 4 and the key groove 5, which is used to limit the relative position between the transmission shaft seat 1 and the injection screw 3 during rotation. Half-moon retaining rings 6 are sleeved on the outside of the upper and lower ends of the injection screw 3. The two half-moon retaining rings 6 are fixedly connected to the front end of the transmission shaft seat 1 by bolts, and are respectively located at the front ends of the two key strips 4, which are used to limit the position of the key strip 4, so that the injection screw 3 is fixed inside the transmission shaft seat 1 and cannot fall off.

[0030] In this embodiment, the injection screw 3 is inserted into the transmission shaft seat 1 through the plug hole 2, and is powered by the transmission shaft seat 1. In the process of driving the injection screw 3 to rotate, the transmission shaft seat 1 locks each other through the key bar 4 and the key groove 5, so that the transmission shaft seat 1 can drive the injection screw 3 to rotate. At the same time, the key bar 4 limits the position through the semi-circular retaining ring 6 at the front end, so that the key bar 4 cannot slide back and forth inside the plug hole 2, thereby preventing the injection screw 3 from falling off during the process of pushing the transmission shaft seat 1 forward and backward.

[0031] like Figure 2 and Figure 3As shown, a telescopic groove 7 is provided inside the end of the key bar 4 away from the injection screw 3, and an opening is provided forward on the lower side of the front end of the telescopic groove 7, a tensioning plate 8 is slidably connected inside the telescopic groove 7 near the end of the injection screw 3, and the tensioning plate 8 penetrates forwardly inside the front end of the key bar 4, so that the tensioning plate 8 can slide back and forth inside the key bar 4, a tensioning slider 9 is slidably connected inside the telescopic groove 7 at the end away from the injection screw 3, and the tensioning slider 9 penetrates inside the key bar 4 away from the injection screw 3, so that the tensioning slider 9 can expand and retract inside the key bar 4, the tensioning plate 8 is fixedly connected to a limiting block 10 at the rear side of one end of the injection screw 3, the telescopic groove 7 is connected to a limiting groove 11 at the rear side of one end of the injection screw 3, and the limiting block 10 is slidably connected inside the limiting block 10, so that the tensioning plate 8 can both slide back and forth inside the key bar 4 and limit the sliding position.

[0032] Preferably, during the assembly process, the tensioning plate 8 is pulled forward through the groove arranged on the upper side of the front end opening of the telescopic slot 7. Since the fitting surfaces of the tensioning plate 8 and the tensioning slider 9 are inclined, and the axial distances between the front ends of the two fitting surfaces and the injection screw 3 are greater than the axial distances between the rear ends of the two fitting surfaces and the injection screw 3, after the tensioning plate 8 is pulled forward, the tensioning slider 9 is smoothly retracted into the key bar 4, so that the key bar 4 can be smoothly inserted into the key slot 5, and the tensioning plate 8 is limited in pulling distance by the limit block 10 and the limit slot 11 to prevent the tensioning plate 8 from being pulled out of the key slot The key strip 4 is pulled out and causes it to fall off. After the injection screw 3 and the key strip 4 are inserted into the transmission shaft seat 1, the half-moon retaining ring 6 is installed at the front end of the transmission shaft seat 1. At this time, since the tensioning plate 8 protrudes outside the key strip 4, the half-moon retaining ring 6 will squeeze the tensioning plate 8 backward during the fixing process, so that the tensioning plate 8 is retracted into the key strip 4 again, and the tensioning slider 9 is pushed upward through the inclined fitting surface with the tensioning slider 9, so that it protrudes outward from the key strip 4 and fits tightly with the inner wall of the plug-in hole 2, so that the transmission shaft seat 1 and the injection screw 3 are firmly and tightly fixed to avoid shaking.

[0033] like Figure 4-Figure 6As shown, the rear end of the half-moon snap ring 6 is fixedly connected to a connecting block 12 near the injection screw 3, and the rear side of the connecting block 12 away from the injection screw 3 is fixedly connected to a locking block 13. The half-moon snap ring 6 can be pre-fixed with the transmission shaft seat 1 through the connecting block 12 and the locking block 13. The half-moon snap ring 6 is fixedly connected to the outside of the end away from the injection screw 3 with a knocking block 14, and the half-moon snap ring 6 can be rotated by knocking the knocking block 14, thereby driving the connecting block 12 and the locking block 13 to rotate. The connecting block 12 and the locking block 13 are both clamped in the transmission shaft seat 1 through the pre-tightening groove 15, and the pre-tightening groove 15 is provided inside the front end of the transmission shaft seat 1 and is connected to the inside of the plug hole 2. The connecting block 12 and the locking block 13 are pre-tightened through the pre-tightening groove 15 is connected to the transmission shaft seat 1, the front end face of the locking block 13 and the front end inner wall of the pre-tightening groove 15 are both arranged in a counterclockwise spiral forward, and the locking block 13 can be smoothly inserted into the pre-tightening groove 15, so that the locking block 13 and the pre-tightening groove 15 can be fixed to each other by rotation, and the locking block 13 and the pre-tightening groove 15 can be mutually locked by knocking the knocking block 14 clockwise, and the transmission shaft seat 1 and the half-moon retaining ring 6 are pre-fixed through the mutual locking between the locking block 13 and the pre-tightening groove 15, and after locking, the bolt hole located inside the half-moon retaining ring 6 can be aligned with the threaded hole located inside the front end of the transmission shaft seat 1, so that the transmission shaft seat 1 and the half-moon retaining ring 6 can be fixed for a second time by bolts.

[0034] Preferably, during the installation of the half-moon snap ring 6, the connecting block 12 and the locking block 13 are first inserted into the pre-tightening groove 15, and then the knocking block 14 is knocked clockwise to make the locking block 13 rotate clockwise in the pre-tightening groove 15. Since the front end face of the locking block 13 and the front end inner wall of the pre-tightening groove 15 are both arranged in a counterclockwise spiral forward, the locking block 13 will move backward in the pre-tightening groove 15 and lock with each other, thereby pre-fixing the half-moon snap ring 6. The pre-fixed half-moon snap ring 6 is then fixed again by bolts, bolt holes and threaded holes, which can not only make the half-moon snap ring 6 more firmly fixed, but also prevent the half-moon snap ring 6 from being difficult to install due to misalignment of the bolt hole and the threaded hole during the fixing process, thereby reducing the difficulty of installation.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for connecting a screw rod and a transmission shaft of an injection molding machine, comprising: A transmission shaft seat (1) and an injection screw (3) arranged at the front end of the transmission shaft seat (1); The front end of the transmission shaft seat (1) is plugged with an injection screw (3) through a plug hole (2), the plug hole (2) is arranged inside the center of the front end of the transmission shaft seat (1), the rear sides of the upper and lower ends of the injection screw (3) are both clamped with key strips (4), the two key strips (4) are clamped in the plug hole (2) through key grooves (5), the upper and lower ends of the injection screw (3) are both sleeved with half-moon retaining rings (6), the two half-moon retaining rings (6) are fixedly connected to the front end of the transmission shaft seat (1) by bolts, and are respectively located at the front ends of the two key strips (4); Features: The key bar (4) is provided with a telescopic groove (7) at one end away from the injection screw (3), and an opening is provided forward at the lower side of the front end of the telescopic groove (7). A tensioning plate (8) is slidably connected to the inside of the telescopic groove (7) near one end of the injection screw (3), and the tensioning plate (8) penetrates forward inside the front end of the key bar (4). A tensioning slider (9) is slidably connected to the inside of the telescopic groove (7) at one end away from the injection screw (3), and the tensioning slider (9) penetrates inside the key bar (4) away from the injection screw (3). The tensioning plate (8) is fixedly connected to a limiting block (10) at the rear side of one end of the injection screw (3). The telescopic groove (7) is connected to a limiting groove (11) at the rear side of one end of the injection screw (3), and the limiting block (10) is slidably connected inside the limiting block (10).

2. The device for connecting a screw rod and a transmission shaft of an injection machine according to claim 1, characterized in that: A groove is provided inside the upper side of the front end opening of the telescopic slot (7), and the tensioning plate (8) can be pulled forward through the groove, and the pulling distance is limited by the limit block (10) and the limit groove (11).

3. The device for connecting a screw rod and a transmission shaft of an injection machine according to claim 1, characterized in that: The contact surfaces of the tensioning abutment plate (8) and the tensioning slider (9) are both arranged in an inclined manner, and the axial distance between the front ends of the two contact surfaces and the injection screw (3) is greater than the axial distance between the rear ends of the two contact surfaces and the injection screw (3).

4. The device for connecting a screw rod and a transmission shaft of an injection machine according to claim 1, characterized in that: The tensioning slider (9) can protrude from the outside of the key bar (4) and fit with the inner wall of the plug hole (2), and the tensioning plate (8) can protrude from the outside of the key bar (4) and fit with the outer wall of the rear end of the half-moon clamp ring (6).

5. The device for connecting a screw rod and a transmission shaft of an injection machine according to claim 1, characterized in that: A connecting block (12) is fixedly connected to the rear end of the half-moon retaining ring (6) near the injection screw (3), a locking block (13) is fixedly connected to the rear side of the connecting block (12) away from the injection screw (3), and a knocking block (14) is fixedly connected to the outside of the half-moon retaining ring (6) away from the injection screw (3). Both the connecting block (12) and the locking block (13) are clamped to the inside of the transmission shaft seat (1) through a pre-tightening groove (15), and the pre-tightening groove (15) is provided inside the front end of the transmission shaft seat (1) and is connected to the inside of the plug hole (2).

6. The device for connecting a screw rod and a transmission shaft of an injection machine according to claim 5, characterized in that: The front end surface of the locking block (13) and the front end inner wall of the pre-tightening slot (15) are both arranged in a counterclockwise spiral and forward, and the locking block (13) can be smoothly inserted into the pre-tightening slot (15).

7. The device for connecting a screw rod and a transmission shaft of an injection machine according to claim 5, characterized in that: The locking block (13) and the pre-tightening groove (15) can be mutually locked by knocking the knocking block (14) clockwise, and after locking, the bolt hole inside the half-moon snap ring (6) can be aligned with the threaded hole inside the front end of the transmission shaft seat (1).

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