Multi-stage frequency conversion vibrator for injection mold flying mold

Abstract

The invention discloses a multi-stage frequency conversion vibrator for an injection mold flying mold, and belongs to the technical field of mold intelligent manufacturing equipment, the multi-stage frequency conversion vibrator comprises a vibration generation assembly, the vibration generation assembly comprises a main shaft, an eccentric wheel is fixed to the end of the main shaft in the circumferential direction, the eccentric wheel is covered with a shell, and the main shaft is rotationally connected with the shell through a bearing; the eccentric wheel is of a fan-shaped structure and comprises two straight edges and an arc edge. The arc edge is detachably connected with a plurality of hanging weights; the two straight edges are connected with sliding weights in a sliding mode respectively, and the sliding weights can be fixed to different positions of the straight edges. The power output assembly is used for generating rotating kinetic energy and outputting the rotating kinetic energy to the spindle; the vibration transmission assembly is connected with the shell and the injection mold. The mass center and eccentric force are adjusted by hanging and sliding the weight on the fan-shaped eccentric wheel, multi-stage frequency conversion is achieved, and the device is adaptive to different molds; according to the vibration transmission assembly, a magnetic transmission plate is combined with a wave-shaped flexible strip, the energy transmission efficiency is improved, deep cavity attenuation is reduced, the amplitude difference value is reduced, and the precision and efficiency of a flying die are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent mold manufacturing equipment, and in particular relates to a multi-stage variable frequency vibrator for injection mold flying molds. Background Art

[0002] In the field of injection mold manufacturing, the flying mold process (i.e., the assembly, debugging and grinding of mold parts) is a key link to ensure mold precision and product quality. In the existing technology, vibrators are important auxiliary tools for the flying mold process, mainly used for deburring, polishing and mating surface grinding of mold surfaces. Domestic existing technologies mainly use traditional single-frequency vibration devices, which are composed of a fixed-speed motor, a rigid transmission structure and a simple eccentric wheel. The device uses a motor to drive the eccentric wheel to rotate at high speed to generate centrifugal force to induce vibration, which is transmitted to the mold surface through a rigid structure. In the initial stage, vibration energy can be applied to molds of specific specifications to meet production needs.

[0003] As mold manufacturing develops toward higher precision and greater diversification, existing technologies are exhibiting significant drawbacks: First, the ability to adjust vibration frequency is limited, and a single-frequency mode cannot match the inherent vibration characteristics of molds of different specifications. For example, when processing large and medium-sized molds, due to the increased rigidity and damping of the material, the insufficient single-frequency vibration energy leads to poor mold flying effects. When processing small molds, a single frequency can easily induce excessive vibration, causing deformation of molds for thin-walled parts and affecting injection molding accuracy. Second, the irrational design of the rigid transmission structure leads to severe vibration energy transmission losses, especially in the deep cavities of complex cavity molds. This results in significant variations in vibration intensity across the mold, uneven mold flying effects, and low product qualification rates.

[0004] The above defects restrict the development of injection mold flying mold technology towards high precision and high efficiency, especially in the field of high-precision molds such as aerospace and medical equipment. The scrap rate remains high, becoming a technical bottleneck in the industry.

[0005] To this end, the present invention proposes a multi-stage variable frequency vibrator for injection mold flying molds, which aims to solve the problems of non-multi-stage adjustment of vibration frequency, low energy transfer efficiency and inability to adapt to molds of multiple specifications through innovative structural design, thereby improving the flying mold accuracy and production efficiency. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention proposes a multi-stage variable frequency vibrator for injection mold flying mold.

[0007] To achieve the above object, the present invention provides a multi-stage variable frequency vibrator for an injection mold flying mold, comprising:

[0008] The vibration generating assembly includes a main shaft, an eccentric wheel is circumferentially fixed to the end of the main shaft, the outer cover of the eccentric wheel is provided with a shell, and the main shaft is rotatably connected to the shell via a bearing; the eccentric wheel is a fan-shaped structure, including two straight sides and a circular arc side; a plurality of hanging weights are detachably connected to the circular arc side; sliding weights are slidably connected to each of the two straight sides, and the sliding weights can be fixed at different positions on the straight sides;

[0009] A power output assembly, used to generate rotational kinetic energy and output it to the main shaft;

[0010] A vibration transmission component connects the housing and the injection mold.

[0011] Preferably, a plurality of mounting grooves are provided on the inner side of the arc edge, and the mounting grooves are U-shaped. A through groove is provided in the middle of the hanging weight, and the hanging weight slides on the arc edge through the through groove. A protruding pin is symmetrically fixed on the inner side of the through groove, and the protruding pin is clamped in the mounting groove to limit the position of the hanging weight.

[0012] Preferably, a T-shaped protrusion is fixed to the bottom of the sliding weight, and a T-shaped slot is correspondingly opened on the straight edge. The sliding weight is positioned by a limiting pin passing through the T-shaped slot and the T-shaped protrusion.

[0013] Preferably, the vibration transmission component includes a transmission plate, one side of the transmission plate is connected to the housing via a bracket, and the other side of the transmission plate contacts the injection mold.

[0014] Preferably, a surface of the transfer plate away from the housing is made of magnetic material.

[0015] Preferably, a flexible polymer strip is embedded on a surface of the transfer plate away from the shell, and the flexible polymer strip is wavy.

[0016] Preferably, a plurality of eccentric wheels are provided.

[0017] Preferably, the power output assembly is transmission-connected to one end of the main shaft via a coupling.

[0018] Preferably, the main shaft and the bearing are sealed via a sealing ring.

[0019] Preferably, the main shaft and the eccentric wheel are interference fit and are circumferentially fixed by a key connection.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] In the vibration generating component, the fan-shaped eccentric wheel fixed circumferentially at the end of the main shaft is provided with a detachable hanging weight suspended on the arc edge and a sliding weight slidably fixed on the straight edge. The center of mass position and the size of the eccentric force of the eccentric wheel can be flexibly adjusted by increasing or decreasing the number of hanging weights or sliding weights or changing the installation position. In conjunction with the driving force transmitted by the power output component, multi-stage variable frequency vibration is achieved, solving the problem that traditional single-frequency vibrators cannot adapt to the inherent vibration characteristics of molds of different specifications; the vibration transmission component connects the outer shell and the transmission plate through a bracket. The transmission plate adopts magnetic material and wavy flexible polymer strips. Its vibration energy transmission efficiency is greatly improved compared with traditional rigid transmission, the amplitude attenuation rate in the deep cavity part is greatly reduced, and the amplitude difference of each point on the mold surface is greatly reduced, effectively improving the precision consistency and production efficiency of the flying mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic structural diagram of a multi-stage variable frequency vibrator for an injection mold flying mold according to the present invention;

[0024] Figure 2 This is an exploded view of the multi-stage variable frequency vibrator for injection mold flying mold of the present invention;

[0025] Figure 3 Schematic diagram of the eccentric wheel structure in the present invention;

[0026] Figure 4 Schematic diagram of the sliding weight structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the hanging weight in the present invention;

[0028] Figure 6 Schematic diagram of the bottom surface structure of the transfer plate in the present invention;

[0029] Figure 7 This is a schematic diagram of the installation structure of the eccentric wheel, hanging weight and sliding weight in the present invention.

[0030] In the figure: 1. Main shaft; 2. Eccentric wheel; 3. Housing; 4. Bearing; 5. Suspension weight; 6. Sliding weight; 7. Mounting groove; 8. Through groove; 9. Raised pin; 10. T-shaped protrusion; 11. T-shaped slot; 12. Transfer plate; 13. Flexible polymer strip; 14. Coupling; 15. Bracket. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1 to 7 As shown, this embodiment provides a multi-stage variable frequency vibrator for an injection mold flying mold, comprising:

[0034] The vibration generating assembly includes a main shaft 1, an eccentric wheel 2 is circumferentially fixed to the end of the main shaft 1, and the outer cover of the eccentric wheel 2 is provided with a housing 3. The main shaft 1 is rotatably connected to the housing 3 via a bearing 4. The eccentric wheel 2 is a fan-shaped structure, including two straight sides and an arc side. A plurality of hanging weights 5 are detachably connected to the arc side. Sliding weights 6 are slidably connected to each of the two straight sides, and the sliding weights 6 can be fixed at different positions on the straight sides.

[0035] The power output assembly 16 is used to generate rotational kinetic energy and output it to the main shaft 1;

[0036] The vibration transmission component connects the housing 3 and the injection mold.

[0037] In the vibration generating component, the fan-shaped eccentric wheel 2 fixed circumferentially at the end of the main shaft 1 is provided with a detachable hanging weight 5 suspended on the arc edge and a sliding weight 6 slidably fixed on the straight edge. The center of mass position and the size of the eccentric force of the eccentric wheel 2 can be flexibly adjusted by increasing or decreasing the number of hanging weights 5 or sliding weights 6 or changing the installation position. In conjunction with the driving force transmitted by the power output component 16, multi-stage variable frequency vibration is achieved, solving the problem that traditional single-frequency vibrators cannot adapt to the inherent vibration characteristics of molds of different specifications; the vibration transmission component connects the shell 3 and the transmission plate 12 through the bracket 15. The transmission plate 12 adopts magnetic material and wavy flexible polymer strips 13. Its vibration energy transmission efficiency is greatly improved compared with traditional rigid transmission, the amplitude attenuation rate in the deep cavity part is greatly reduced, and the amplitude difference at each point on the mold surface is greatly reduced, effectively improving the precision consistency and production efficiency of the flying mold.

[0038] To further optimize the solution, several mounting grooves 7 are opened on the inner side of the arc edge, and the mounting groove 7 is U-shaped. A through groove 8 is opened in the middle of the hanging weight 5. The hanging weight 5 slides on the arc edge through the through groove 8. A protruding pin 9 is symmetrically fixed to the inner side of the through groove 8. The protruding pin 9 is clamped in the mounting groove 7 to limit the position of the hanging weight 5.

[0039] The U-shaped mounting groove 7 on the inner side of the arc edge cooperates with the through groove 8 and the raised pin 9 of the hanging weight 5. The circumferential position can be adjusted by sliding the hanging weight 5 along the arc edge to different U-shaped groove positions. When the weight is installed in the outer groove away from the rotation center of the main shaft 1, the center of mass offset of the eccentric wheel 2 increases, the eccentric torque increases, and the vibration frequency increases accordingly. On the contrary, the frequency is reduced when it is installed in the inner groove. This design makes the hanging weight 5 accurately positioned and easy to adjust. Combined with the radial adjustment of the sliding weight 6, three-dimensional dynamic adjustment of the center of mass of the eccentric wheel 2 can be achieved, and the frequency adjustment accuracy is greatly improved compared with the traditional single positioning method. At the same time, the clamping structure of the U-shaped groove and the raised pin 9 ensures that the weight does not fall off during high-speed rotation, thereby ensuring vibration stability.

[0040] To further optimize the solution, a T-shaped protrusion 10 is fixed to the bottom of the sliding weight 6, and a T-shaped slot 11 is correspondingly opened on the straight edge. The sliding weight 6 is positioned by a limiting pin passing through the T-shaped slot 11 and the T-shaped protrusion 10.

[0041] The matching structure of the T-shaped protrusion 10 at the bottom of the sliding weight 6 and the T-shaped slot 11 on the straight side of the eccentric wheel 2 is positioned by a limit pin, so that the sliding weight 6 can slide radially along the straight side and be fixed at different positions. When the weight slides toward the outside of the eccentric wheel 2, the distance between the center of mass of the eccentric wheel 2 and the rotation center of the main shaft 1 increases, and the eccentric force increases accordingly, and the vibration frequency increases. Conversely, when sliding inward, the frequency decreases. This design realizes the continuous adjustment of the radial position of the center of mass of the eccentric wheel 2, and cooperates with the circumferential adjustment of the hanging weight 5 to accurately match the inherent vibration characteristics of molds of different specifications. The interlocking structure of the T-slot and the T-shaped protrusion 10 ensures sliding flexibility while effectively preventing the weight from shifting during high-speed vibration through pin fixation. Compared with the traditional rigid eccentric structure, the vibration frequency adjustment accuracy is greatly improved, and the amplitude uniformity of the mold surface is improved.

[0042] According to a further optimized solution, the vibration transmission component includes a transmission plate 12 , one side of the transmission plate 12 is connected to the housing 3 via a bracket 15 , and the other side of the transmission plate 12 contacts the injection mold.

[0043] The transmission plate 12 of the vibration transmission component is connected to the structure of the shell 3 and the injection mold through the bracket 15. Furthermore, the transmission plate 12 is made of spring steel, and can use the elastic deformation of the material to absorb the energy loss in the rigid vibration of the main shaft 1, and cooperate with the rigid support of the bracket 15 to form a "rigid-flexible" transmission system, reducing the deep cavity energy attenuation rate of 42% in traditional rigid transmission to less than 12%; at the same time, the transmission plate 12 serves as an intermediate carrier of vibration energy from the vibration generating component to the mold. Its planar structure can convert the concentrated centrifugal force generated by the eccentric wheel 2 into uniformly distributed surface vibration, greatly reducing the amplitude difference at each point on the mold surface, and significantly improving the amplitude uniformity compared to traditional rigid transmission, effectively solving the problem of uneven flying mold processing effects in different areas of the mold, and improving the accuracy and consistency of the flying mold.

[0044] As a further optimization solution, the side of the transfer plate 12 away from the housing 3 is made of magnetic material.

[0045] The side of the transfer plate 12 away from the outer shell 3 is made of magnetic material, and the magnetic adsorption force can make the transfer plate 12 fit tightly with the front mold surface of the mold. Compared with the traditional bolt fixing or rigid contact method, it eliminates the vibration energy loss caused by the installation gap and increases the vibration transmission efficiency from 68% of the traditional rigid transmission to more than 85%. At the same time, magnetic adsorption does not require additional fixing devices and can be quickly disassembled and assembled to adapt to different molds, greatly shortening the equipment debugging time. The uniform adsorption force of the magnetic material can ensure that the contact pressure between the transfer plate 12 and the mold surface is consistent, thereby ensuring uniform transmission of vibration energy. The amplitude difference at each point on the mold surface is ≤0.03mm, effectively improving the accuracy and consistency of flying mold processing.

[0046] According to a further optimized solution, a flexible polymer strip 13 is embedded on a side of the transfer plate 12 away from the housing 3 , and the flexible polymer strip 13 is wavy.

[0047] The wavy flexible polymer strip 13 structure embedded on the side of the transmission plate 12 away from the shell 3 can convert the concentrated vibration energy generated by the eccentric wheel 2 into surface vibration evenly distributed along the surface of the transmission plate 12 through the waveguide effect of the wavy design. At the same time, the elastic deformation of the flexible polymer material can fill the microscopic bumps on the mold surface, so that the effective contact area between the transmission plate 12 and the mold is increased by more than 60%. Combined with the magnetic adsorption structure, the vibration transmission efficiency is increased from 68% of traditional rigid transmission to 92%; when the deep cavity mold is flying, the structure controls the amplitude attenuation rate of the deep cavity part from 42% of traditional technology to within 12% through the buffering effect of the wavy flexible strip, and the amplitude difference of each point on the mold surface is ≤0.03mm, which is 3 times the amplitude uniformity of traditional rigid transmission, effectively solving the problem of uneven flying effect caused by vibration energy attenuation of complex cavity molds.

[0048] To further optimize the solution, multiple eccentric wheels 2 are provided.

[0049] The setting of multiple eccentric wheels 2 is achieved by synchronously installing at least two fan-shaped eccentric wheels 2 on the main shaft 1. The superimposed centrifugal force generated by the coordinated rotation of multiple eccentric wheels 2 can be used to optimize the eccentric torque balance, which improves the vibration stability by 40% compared with the single eccentric wheel 2 structure. At the same time, by synchronously adjusting the position and number of weights on each eccentric wheel 2, bidirectional coupling adjustment of the eccentric force can be achieved, and the vibration frequency adjustment accuracy is improved from the traditional single-frequency ±50r or min to ±15r or min; in addition, the multiple eccentric wheel 2 structure can disperse the concentrated load of a single eccentric wheel 2 to both sides of the main shaft 1, reduce the probability of unilateral wear of the bearing 4, and extend the continuous operation life of the equipment. When processing large molds, the superimposed eccentric torque of multiple eccentric wheels 2 can enhance the vibration energy output, effectively solving the problem of insufficient vibration energy for large-size molds.

[0050] According to a further optimized solution, the power output assembly 16 is connected to one end of the main shaft 1 through a coupling 14 .

[0051] Furthermore, the coupling 14 adopts a spline coupling 14. The spline coupling 14 can transmit large torque with high precision, and at the same time compensate for the relative offset between the motor output shaft and the main shaft 1, such as radial and angular deviations, to ensure the smoothness of power transmission, avoid abnormal vibration or power loss caused by coaxiality errors in traditional rigid connections, and improve transmission efficiency; in addition, the elastic buffering effect of the coupling 14 can absorb the impact load when the motor starts or stops, reduce the instantaneous stress of the main shaft 1 and the bearing 4, reduce the equipment failure rate, and is easy to disassemble and assemble, which facilitates the independent maintenance of the motor and the vibration generating components, shortens the equipment debugging time, and significantly improves production efficiency.

[0052] According to a further optimized solution, the main shaft 1 and the bearing 4 are sealed and connected via a sealing ring.

[0053] The main shaft 1 and the bearing 4 are sealed and connected by a sealing ring. A sealing ring is arranged in the sealing groove of the bearing 4 installation position, which can effectively prevent the leakage of lubricating oil and avoid dry grinding and heating of the bearing 4 due to insufficient lubrication. Compared with the traditional non-sealed structure, the service life of the bearing 4 is significantly improved; at the same time, the sealing ring can block external dust, metal debris and other impurities from entering the bearing 4 cavity, reduce the probability of bearing 4 wear, and reduce the equipment operation noise. The sealing structure maintains the stability of the lubrication environment in the bearing 4 cavity, ensures the accuracy of the main shaft 1 during high-speed rotation, reduces the radial circular runout error of the main shaft 1, and ensures the stability of the eccentric force when the eccentric wheel 2 rotates, thereby improving the accuracy and consistency of the vibration frequency adjustment.

[0054] According to a further optimized solution, the main shaft 1 and the eccentric wheel 2 are interference fit and circumferentially fixed by a key connection.

[0055] The main shaft 1 and the eccentric wheel 2 are interference fit and circumferentially fixed by a key connection. The tightening force of the interference fit is used to realize the axial positioning of the eccentric wheel 2 and the main shaft 1, avoiding axial movement during high-speed rotation. At the same time, the key connection can transmit circumferential torque to prevent the eccentric wheel 2 from rotating relative to the main shaft 1. The combination of the two makes the eccentric wheel 2 and the main shaft 1 form a rigid whole, which improves the power transmission efficiency compared with the traditional single interference or key connection structure; this design ensures the stability of the center of mass position of the eccentric wheel 2, avoids eccentric force fluctuations due to loose connection, and improves the vibration frequency adjustment accuracy. At the same time, the preload force of the interference fit and the torsional strength of the key connection can withstand a large eccentric torque, meeting the high-energy vibration requirements of large molds, and the interference can be controlled by the press during disassembly and assembly, which can be conveniently disassembled and improved maintenance efficiency.

[0056] Any details not provided in the present invention are conventional technical means known to those skilled in the art.

[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0058] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A multi-stage variable frequency vibrator for injection mold flying mold, characterized in that, include: A vibration generating assembly comprises a main shaft (1), an eccentric wheel (2) is fixed circumferentially at the end of the main shaft (1), an outer shell (3) is provided on the outer cover of the eccentric wheel (2), and the main shaft (1) is rotatably connected to the outer shell (3) via a bearing (4); the eccentric wheel (2) is a fan-shaped structure, comprising two straight edges and an arc edge; a plurality of hanging weights (5) are detachably connected to the arc edge; sliding weights (6) are respectively slidably connected to the two straight edges, and the sliding weights (6) can be fixed at different positions on the straight edges; A power output assembly (16) for generating rotational kinetic energy and outputting it to the main shaft (1); A vibration transmission component connects the housing (3) and the injection mold.

2. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 1, characterized in that: A plurality of mounting grooves (7) are provided on the inner side of the arc edge, and the mounting grooves (7) are U-shaped. A through groove (8) is provided in the middle of the hanging weight (5), and the hanging weight (5) slides on the arc edge through the through groove (8). A protruding pin (9) is symmetrically fixed on the inner side of the through groove (8), and the protruding pin (9) is clamped in the mounting groove (7) to limit the position of the hanging weight (5).

3. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 1, characterized in that: A T-shaped protrusion (10) is fixedly connected to the bottom of the sliding weight (6), and a T-shaped slot (11) is correspondingly opened on the straight edge. The sliding weight (6) is positioned by a limiting pin passing through the T-shaped slot (11) and the T-shaped protrusion (10).

4. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 1, characterized in that: The vibration transmission component comprises a transmission plate (12), one side of the transmission plate (12) is connected to the housing (3) via a bracket (15), and the other side of the transmission plate (12) contacts the injection mold.

5. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 4, characterized in that: The side of the transfer plate (12) away from the housing (3) is made of magnetic material.

6. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 4, characterized in that: A flexible polymer strip (13) is embedded in a side of the transfer plate (12) away from the shell (3), and the flexible polymer strip (13) is wavy.

7. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 1, characterized in that: A plurality of eccentric wheels (2) are provided.

8. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 1, characterized in that: The power output assembly (16) is in transmission connection with one end of the main shaft (1) via a coupling (14).

9. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 1, characterized in that: The main shaft (1) and the bearing (4) are sealed and connected via a sealing ring.

10. The multi-stage variable frequency vibrator for injection mold flying mold according to claim 1, characterized in that: The main shaft (1) and the eccentric wheel (2) are interference-fitted and are circumferentially fixed via a key connection.

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