A connecting assembly and a double-screw rod electrically integrated moving device of an electric injection molding machine

Abstract

The utility model relates to the field of injection molding machine manufacturing discloses a connecting assembly and electric injection molding machine double screw rod electric whole shift device, including the screw rod of symmetrical setting at the both sides of injection seat, the screw nut of cooperation has in two screw rods, is provided with the connecting assembly between the screw nut and the head board, and the connecting assembly includes the connecting block of detachable fixed connection with the head board, the screw rod cover of fixed in the screw nut one end close to the head board and with internal thread and is connected between the connecting block and the screw rod cover connecting rod, and the both ends of connecting rod are provided with first screw section and second screw section with same screw direction and different pitch respectively, and the connecting sleeve with internal thread is fixedly arranged on the connecting block, and first screw section and second screw section are respectively screwed with connecting sleeve and screw rod cover, and this device improves the precision of adjustment, the success rate of assembly and the stability of structure.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine manufacturing, and in particular to a connecting component and a dual lead screw electric adjustment device for an electric injection molding machine. Background Technology

[0002] The electric adjustment device of injection molding machine generally includes a single lead screw adjustment structure and a double lead screw adjustment structure. Compared with the former, the latter has higher precision, stronger load capacity and smoother movement.

[0003] Chinese Patent No. CN217891637U discloses a transfer device for a small injection molding machine, including a lead screw drive assembly, a connecting assembly, and a drive assembly. The lead screw drive assembly includes lead screws symmetrically arranged on both sides of the injection seat, each lead screw engaging with a nut fixed to another component. The nut does not move during the entire injection process. The connecting assembly includes two sets of connecting rods and two sets of lead screw sleeves with internal threads. Each lead screw sleeve is concentrically fixed to the end of a nut near the head plate. The end of the connecting rod near the head plate is horizontally pivotally connected to the head plate, and its other end is provided with a threaded section that is screwed to the lead screw sleeve. The drive assembly is located at the tail end of the injection seat and can drive the two lead screws to rotate synchronously.

[0004] The aforementioned connecting rod is pivotally connected to a connecting block. The connecting block has mounting holes at its four corners, which are precisely aligned with the threaded holes on the head plate and then locked in place by bolts. This design requires very high assembly precision for each component, as it is essential to ensure that the mounting holes of the connecting block correspond one-to-one with the threaded holes on the head plate and that the connecting block fits perfectly against the head plate. The adjustment precision of the aforementioned patent is the pitch of the threaded section. The necessary condition for assembly is that the adjustment distance is divisible by the pitch or the remainder is less than the maximum permissible error value. The lower the adjustment precision, the higher the assembly success rate. Therefore, it is essential to provide a connecting component that improves the adjustment precision. Utility Model Content

[0005] In view of the shortcomings of existing connecting components, such as low adjustment accuracy and high assembly failure rate, the primary objective of this utility model is to provide a connecting component that can significantly improve adjustment accuracy and reduce assembly failure rate.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method: A connecting assembly includes a connecting block detachably and fixedly connected to a head plate, a lead screw sleeve fixed to one end of a lead screw nut near the head plate and having internal threads, and a connecting rod connecting the connecting block and the lead screw sleeve. The two ends of the connecting rod are respectively provided with a first threaded segment and a second threaded segment with the same thread direction but different pitches. A connecting sleeve with internal threads is fixedly provided on the connecting block. The first threaded segment and the second threaded segment are screwed into the connecting sleeve and the lead screw sleeve, respectively.

[0007] Compared to the single-pitch thread adjustment in the comparative patent, this solution utilizes a thread segment design with different pitches at both ends, employing the pitch difference to achieve "differential adjustment." This improves adjustment accuracy, reduces assembly difficulty, and ensures final force balance. For example, assuming the single pitch in the comparative patent is 2mm, its adjustment accuracy is 2mm, significantly exceeding the maximum allowable assembly error of 0.15mm, increasing the probability of assembly problems. However, with this improved solution, if the pitch of the first thread segment is 2mm and the second thread segment is 1.9mm, rotating the connecting rod one turn results in a 2mm displacement at the connecting sleeve end and a 1.9mm displacement at the lead screw sleeve end, with an actual relative adjustment of 0.1mm. This means the adjustment accuracy is 0.1mm, less than the maximum assembly error of 0.15mm, ensuring successful final assembly.

[0008] Preferably, a locking nut is screwed onto both the first and second threaded sections.

[0009] Using the above solution, the locking nut has the function of preventing loosening and tightening. After adjustment, by pressing the locking nut against the end face of the connecting sleeve or screw sleeve, the thread of the connecting rod can be prevented from loosening due to equipment vibration or long-term use, thus ensuring the stability of the position after adjustment.

[0010] Preferably, the absolute value of the pitch difference between the first thread segment and the second thread segment is less than the maximum permissible assembly error value.

[0011] By adopting the above solution, the pitch difference is limited to be less than the maximum allowable assembly error value, so that the smallest adjustment unit can cover the actual assembly error range. In this way, even if there are machining or installation deviations, the error can still be eliminated by fine adjustment, ensuring that the connecting block and the head plate fit perfectly. This solves the problem of "assembly failure due to mismatch between adjustment amount and error" in the prior art. In addition, it can be adapted to machining parts of different precision levels, reducing the requirements for the machining precision of parts, reducing production costs, and ensuring that the structural precision after assembly meets the usage requirements.

[0012] The second objective of this utility model is to provide a dual lead screw electric adjustment device for an electric injection molding machine, comprising lead screws symmetrically arranged on both sides of the injection seat, each lead screw being fitted with a lead nut, and the connecting assembly described above being provided between the lead nut and the head plate.

[0013] This utility model, by adopting the above technical solutions, has significant technical effects: Through the design of threaded sections with different pitches at both ends of the connecting rod, differential adjustment is achieved using the pitch difference, greatly improving adjustment accuracy, effectively reducing assembly difficulty, and ensuring that the connecting block can accurately fit the head plate; the locking nut prevents loosening, enhances structural rigidity, and ensures the stability of the adjusted position and the synchronization of the double lead screw movement; at the same time, limiting the pitch difference to less than the allowable assembly error ensures effective adjustment and increased adaptability. Compared with the comparative patent, it has significant optimizations in adjustment accuracy, assembly success rate, and structural stability. Attached Figure Description

[0014] Figure 1 This is an isometric view of a dual-screw electric displacement device for an electric injection molding machine according to this embodiment; Figure 2 This is a cross-sectional view of the connection component in this embodiment; Figure 3 This is a top view of the connection component in this embodiment.

[0015] The parts referred to by the numbers in the above figures are as follows: 1. Connecting block; 2. Connecting rod; 3. First threaded section; 4. Second threaded section; 5. Connecting sleeve; 6. Lead screw sleeve; 7. Locking nut; 8. Head plate; 9. Injection seat; 10. Nut; 11. Lead screw; 12. Drive assembly. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] A dual-screw electric adjustment device for an electric injection molding machine, as described in the reference. Figures 1-3 As shown, the injection molding machine is positioned between the head plate 8 and the injection seat 9, and includes two lead screws 11 symmetrically arranged on both sides of the injection seat 9. A drive assembly 12 is provided at the end of the injection seat 9 away from the head plate 8. The drive assembly 12 can realize the synchronous rotation of the two lead screws 11. The drive assembly 12 includes a drive motor and a synchronous belt assembly. Since the drive assembly 12 is existing technology, its specific structure will not be described in detail here.

[0018] Each of the two lead screws 11 is fitted with a lead nut 10, and a set of identical connecting components is provided on both sides of the head plate 8 and between the two lead nuts 10.

[0019] See details Figure 2 and Figure 3As shown, the connecting assembly includes a connecting block 11 screwed to the head plate 8, a lead screw sleeve 6 fixed to one end of the lead screw nut 10 near the head plate 8 and having an internal thread at the end, and a connecting rod 22 connecting the connecting block 11 and the lead screw sleeve 6. The four corners of the connecting block 11 are provided with mounting holes corresponding to the threaded holes on the head plate 8. The two ends of the connecting rod 22 are respectively provided with a first threaded section 3 and a second threaded section 4 with the same thread direction but different pitches. A connecting sleeve 5 with an internal thread is fixedly provided on the connecting block 11. The first threaded section 3 and the second threaded section 4 are screwed to the connecting sleeve 5 and the lead screw sleeve 6, respectively.

[0020] The maximum allowable assembly error of this scheme is 0.15. In this embodiment, the pitch of the first threaded section 3 is 2mm, the pitch of the connecting sleeve 5 is 2mm, the pitch of the second threaded section 4 is 1.9mm, the pitch of the lead screw sleeve 6 is 1.9mm, and the connecting block 11 moves forward 0.1mm towards the head plate 8 for each rotation of the connecting rod 22. That is, the adjustment accuracy is 0.1mm, which is less than the maximum allowable assembly error. A locking nut 7 for preventing loosening is screwed onto the first threaded section 3 and the second threaded section 4. The anti-loosening clamping torque of the locking nut 7 is greater than the driving torque of the lead screw 11.

[0021] The assembly process is as follows: 1. First assemble the connecting components on one side, and use that side as a control group; 2. To assemble the other side, first, rotate the connecting rod 22 a certain number of turns relative to the connecting sleeve 5 and the lead screw sleeve 6. Do not tighten the locking nut 7 until the connecting block 11 can be pre-connected to the threaded hole of the head plate 8 after the bolt passes through the mounting hole. Do not tighten the bolt. At this time, there is a certain gap between the connecting block 11 and the head plate 8. After the operator measures this gap, directly determine the number of turns of the connecting rod 22. Assuming that the gap between the connecting block 11 and the head plate 8 is 2mm after measurement, rotating the connecting rod 22 20 times will ensure that the connecting block 11 and the head plate 8 are completely fitted. Finally, tighten the bolt and the locking nut 7 to complete the assembly.

[0022] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A connecting assembly comprising a connecting block (1) detachably and fixedly connected to a head plate (8), a lead screw sleeve (6) fixed to one end of a lead screw nut (10) near the head plate (8) and having internal threads, and a connecting rod (2) connecting the connecting block (1) and the lead screw sleeve (6), characterized in that: The two ends of the connecting rod (2) are respectively provided with a first thread section (3) and a second thread section (4) with the same thread direction and different thread pitch. The connecting block (1) is fixedly provided with a connecting sleeve (5) with internal thread. The first thread section (3) and the second thread section (4) are respectively screwed into the connecting sleeve (5) and the screw sleeve (6).

2. A connection component according to claim 1, characterized in that: A locking nut (7) is screwed onto the first threaded section (3) and the second threaded section (4).

3. A connection component according to claim 2, characterized in that: The absolute value of the pitch difference between the first thread segment (3) and the second thread segment (4) is less than the maximum permissible assembly error value.

4. A dual-screw electric adjustment device for an electric injection molding machine, comprising screws (11) symmetrically arranged on both sides of an injection seat (9), each screw (11) being fitted with a nut (10), characterized in that: A connecting component as described in any one of claims 1-3 is provided between the nut (10) and the head plate (8).

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