Injection molding mechanism driven by single cylinder

Abstract

The invention relates to the field of injection molding equipment, and particularly discloses a single-cylinder-driven injection molding mechanism which comprises a hydraulic cylinder, a machine base, a sliding base, a motor, an injection molding head and a material pushing rod, a containing cavity is formed in the center of the machine base, a first through hole is formed in the rear portion of the machine base, and a second through hole is formed in the front portion of the machine base; the hydraulic cylinder is connected with the rear portion of the machine base and connected with the sliding base through the first through hole, and the injection molding head is connected with the front portion of the machine base. A sliding rail is arranged on the machine base, and the sliding base is provided with a sliding block matched with the sliding rail. A rotating shaft is arranged in the sliding seat and is provided with a first driving wheel; the motor is arranged on the sliding seat and is provided with a second driving wheel, and the second driving wheel is connected with the first driving wheel through a transmission belt; the axes of the hydraulic cylinder, the rotating shaft and the pushing rod are located on the same straight line. According to the invention, the injection molding process can be completed, and damage such as bending of the push rod is prevented.

Description

Technical Field

[0001] The present invention relates to the field of injection molding equipment, in particular to an injection molding mechanism driven by a single cylinder. Background Art

[0002] Injection molding is an important method for producing plastics. It uses an injection molding mechanism to inject heated plastic raw materials into a mold. During the injection molding process, the push rod of the injection molding mechanism needs to keep rotating and moving inside the injection head. The existing push rod is pushed by two or more hydraulic cylinders, but different hydraulic cylinders are prone to thrust imbalance, causing the push rod to get stuck in the injection head, making maintenance difficult. In addition, the existing push rod is driven by a transmission gear through a motor. The transmission gear is connected to the push rod through a spline to drive the push rod to rotate. The transmission gear of the above structure needs to maintain relative motion with the push rod, which has high requirements for the working environment and daily maintenance, increasing production costs. Summary of the Invention

[0003] In order to solve the defects of the prior art, the present invention provides a single-cylinder driven injection molding machine, which can complete the injection molding process and prevent the push rod from being damaged such as bending.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a single-cylinder driven injection molding mechanism, including a hydraulic cylinder, a machine base, a slide, a motor, an injection molding head and a push rod, the machine base has an accommodating cavity in the center, a first through hole at the rear, and a second through hole at the front, the slide is arranged in the accommodating cavity; the hydraulic cylinder is connected to the rear of the machine base and is connected to the slide through the first through hole, and the injection molding head is connected to the front of the machine base; a slide rail is provided on the machine base, and the slide has a slider arranged in cooperation with the slide rail; a rotating shaft is provided in the slide, and the rotating shaft is provided with a first driving wheel, one end of the push rod is connected to the rotating shaft, and the other end extends into the injection molding head; the motor is provided on the slide and is provided with a second driving wheel, and the second driving wheel is connected to the first driving wheel through a transmission belt; the axes of the hydraulic cylinder, rotating shaft and push rod are located on the same straight line.

[0005] As an improvement of the above scheme, the sliding seat is provided with a rotating shaft cavity, and the rotating shaft is arranged in the rotating shaft cavity; a disc portion is formed in the center of the rotating shaft, the rear end of the disc portion forms a first step, and the front end forms a second step, the first step is installed with a plane bearing, and the second step is installed with an inclined bearing.

[0006] As an improvement to the above solution, a first mounting hole is provided at the rear end of the rotating shaft cavity, and a first mounting portion is provided at the rear end of the rotating shaft. The first mounting portion is connected to the first mounting hole via a ball bearing.

[0007] As an improvement of the above-mentioned solution, the push rod of the hydraulic cylinder is connected to the slide seat through a connecting plate, wherein a mounting groove is provided on the back of the connecting plate and a first mounting protrusion is provided on the front, and the mounting groove and the first mounting protrusion are coaxially arranged; the push rod of the hydraulic cylinder extends into the mounting groove, and the first mounting protrusion extends into the first mounting hole.

[0008] As an improvement of the above solution, the hydraulic cylinder is provided with a second mounting protrusion ring, and the second mounting protrusion ring extends into the first through hole; the first through hole is also provided with an avoidance cavity, and the connecting disk can enter the avoidance cavity.

[0009] As an improvement of the above solution, a feeding cavity is provided in the injection head, a feeding port is provided on the side of the feeding cavity, and a discharge port is provided at the end; the push rod is located in the feeding cavity and has a thread on its surface.

[0010] As an improvement of the above-mentioned solution, a connecting platform is provided on the top of the slide, and the slider is connected to the slide through the connecting platform; the connecting platform includes a horizontal plate, a first vertical plate and a second vertical plate, and the slider is arranged at the four corners of the bottom of the horizontal plate, the first vertical plate extends upward from the front end surface of the slide to the bottom surface of the horizontal plate, and the second vertical plate extends upward from the rear end surface of the slide to the bottom surface of the horizontal plate; a motor mounting plate protruding upward is provided on the horizontal plate.

[0011] As an improvement to the above solution, a reinforcing plate extending in the front-rear direction is provided in the center of the first vertical plate.

[0012] As an improvement to the above solution, the motor mounting plate has a mounting surface for connecting the motor, and a vertically arranged limit plate is provided on the outer side of the mounting surface; the mounting surface is provided with screw holes.

[0013] The implementation of the present invention has the following beneficial effects:

[0014] This solution uses a single hydraulic cylinder to push the slide to move. The axis of the hydraulic cylinder coincides with the center of the slide, which can avoid the slide from swinging due to unbalanced thrust when more than two hydraulic cylinders push the slide, causing the push rod to bend and be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a single-cylinder driven injection molding mechanism of the present invention;

[0016] Figure 2 It is a cross-sectional view of a single-cylinder driven injection molding mechanism of the present invention;

[0017] Figure 3 yes Figure 2 A magnified view of part A;

[0018] Figure 4 It is a schematic diagram of the assembly structure of the slide and the base of the present invention;

[0019] Figure 5 It is a structural schematic diagram of the motor mounting plate of the present invention. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0021] like Figures 1-4 As shown, a specific embodiment of the present invention provides a single-cylinder driven injection molding mechanism, including a hydraulic cylinder 1, a machine base 2, a slide 3, a motor 4, an injection head 5 and a push rod 6. The machine base 2 has a central accommodating cavity 21, a first through hole 22 at the rear, and a second through hole 23 at the front. The slide 3 is arranged in the accommodating cavity 21; the hydraulic cylinder 1 is connected to the rear of the machine base 2 and is connected to the slide 3 through the first through hole 22, and the injection head 5 is connected to the front of the machine base 2; the machine base 2 A slide rail 24 is provided on the slide 3, and the slide 3 has a slider 25 that is arranged in cooperation with the slide rail 24; a rotating shaft 31 is provided in the slide 3, and the rotating shaft 31 is provided with a first driving wheel 32, one end of the push rod 6 is connected to the rotating shaft 31, and the other end extends into the injection head 5; the motor 4 is arranged on the slide 3, and is provided with a second driving wheel 41, and the second driving wheel 41 is connected to the first driving wheel 32 through a transmission belt 42; the axes of the hydraulic cylinder 1, the rotating shaft 31 and the push rod 6 are located on the same straight line.

[0022] This solution uses a single hydraulic cylinder to push the slide to move. The axis of the hydraulic cylinder 1 coincides with the center of the slide 3, which can avoid the slide 3 from swinging due to unbalanced thrust when more than two hydraulic cylinders 1 push the slide 3, causing the push rod 6 to bend and be damaged.

[0023] In order to ensure that the slide 3 can provide precise positioning and thrust for the rotating push rod 6, the slide 3 is provided with a shaft cavity 33, in which the shaft 31 is located; a disc portion 311 is formed in the center of the shaft 31, the rear end of the disc portion 311 forms a first step 312, and the front end forms a second step 313, the first step 312 is installed with a plane bearing 34, and the second step 313 is installed with an inclined bearing 35. When the injection molding machine is working, the push rod of the hydraulic cylinder 1 extends forward, pushing the slide 3 forward, and the push rod 6 rotates and enters the injection head 5 driven by the motor 4, where the plastic particles are heated and injected into the mold from the front end of the injection head 5 to complete the injection molding of the plastic. How to smoothly transmit the thrust to the longer push rod 6 through the shaft 31 is the focus of this solution. This embodiment employs a rotating shaft 31 having a central disc portion 311. This central disc portion 311 is relatively heavy, balancing the offset center of gravity of the ejector rod 6. This ensures that when the rotating shaft 31 and the ejector rod 6 are coupled, their centers of gravity are located close to the slide 3, reducing wear on the bearings on the rotating shaft 31. Furthermore, both sides of the disc portion 311 can serve as support surfaces for different bearings. In this embodiment, one side comprises a planar bearing 34, and the other side comprises an inclined bearing 35. The planar bearing 34 is used to transmit the axial thrust of the slide 3 to the rotating shaft 31, while the inclined bearing 35 provides both a reset thrust and a radial limiting force for the rotating shaft 31.

[0024] A first mounting hole 36 is defined at the rear end of the shaft cavity 33, and a first mounting portion 314 is defined at the rear end of the shaft 31. The first mounting portion 314 is connected to the first mounting hole 36 via a ball bearing 37. It should be noted that the ball bearing 37 cooperates with the inclined bearing 35 to radially limit the shaft 31, ensuring that the shaft 31 can withstand significant deflection forces.

[0025] In order to ensure the coaxiality of the hydraulic cylinder 1 and the rotating shaft 31, the push rod of the hydraulic cylinder 1 is connected to the slide 3 through a connecting plate 7, wherein the connecting plate 7 is provided with a mounting groove 71 on the back and a first mounting protrusion 72 on the front, and the mounting groove 71 and the first mounting protrusion 72 are coaxially arranged; the push rod of the hydraulic cylinder 1 extends into the mounting groove 71, and the first mounting protrusion 72 extends into the first mounting hole 36.

[0026] Preferably, the hydraulic cylinder 1 is provided with a second mounting protrusion 11, which extends into the first through-hole 22. The first through-hole 22 is also provided with a relief cavity 221, into which the connecting plate 7 can enter. By providing the relief cavity 221 in the first through-hole 22, the stroke of the slide 3 can be increased while the length of the accommodating cavity 21 is fixed, thereby extending the stroke of the ejector rod 6 and increasing the maximum injection volume without increasing the overall length of the equipment, thereby meeting greater injection molding requirements.

[0027] Preferably, a feeding cavity 51 is provided in the injection head 5, a feeding port 52 is provided on the side of the feeding cavity 51, and a discharge port 53 is provided at the end; the push rod 6 is located in the feeding cavity 51 and has a thread 61 on its surface. A heating mechanism 54 is also provided on the periphery of the injection head 5. During injection molding, plastic particles enter the feeding cavity 51 through the feeding port 52. The push rod 6 rotates under the drive of the motor 4 and delivers the plastic particles to the vicinity of the discharge port 53. During the conveying process, the plastic particles are stirred by the thread 61 of the push rod 6, are evenly heated, and gradually become liquid. At the same time, the push rod 6 also moves toward the discharge port 53 following the slide 3 under the power of the hydraulic cylinder 1, and inputs the liquid raw material from the discharge port 53 into the mold to complete the injection molding process.

[0028] Preferably, a connecting platform 38 is provided on the top of the slide 3, and the slider 25 is connected to the slide 3 through the connecting platform 38; the connecting platform 38 includes a horizontal plate 381, a first vertical plate 382 and a second vertical plate 383, and the slider 25 is arranged at the four corners of the bottom of the horizontal plate 381, the first vertical plate 382 extends upward from the front end surface of the slide 3 to the bottom surface of the horizontal plate 381, and the second vertical plate 383 extends upward from the rear end surface of the slide 3 to the bottom surface of the horizontal plate 381; the horizontal plate 381 is provided with a motor mounting plate 384 protruding upward. As mentioned above, the smooth movement of the slide 3 plays a key role in the stability of the push rod 6. Therefore, by providing a connecting platform 38 on the top of the slide 3, the slider 25 is connected to the slide 3 via the connecting platform 38. On the one hand, the cooperation between the slide rail 24 and the slider 25 further defines the movement trajectory of the slide 3. On the other hand, the center of gravity of the slide 3 is lower than the slider 25. The slide 3 has automatic stability under the action of gravity, reducing the deviation of the slide 3 during movement due to wear of the slider 25. On this basis, the first vertical plate 382 and the second vertical plate 383 are provided to reduce the up and down swing of the slide 3 when it encounters the resistance of the push rod 6.

[0029] To further enhance the torsional strength of the first vertical plate 382, ​​a reinforcing plate 385 extending forward and backward is provided at the center of the first vertical plate 382. This reinforcing plate 385 extends forward and backward along the central axis of the slide 3. This prevents the shaft cavity 33 from twisting under high thrust and prevents bending of the first vertical plate 382 in the direction of weak stress, thereby ensuring stable operation of the shaft 31.

[0030] Combine Figure 5As shown, in some embodiments, the motor mounting plate 384 has a mounting surface 386 for connecting to the motor 4. A vertical stop plate 387 is provided on the outer side of the mounting surface 386. The mounting surface 386 is also provided with screw holes 388. The motor 4 is mounted directly above the slide 3 via the screw holes 388 on the mounting surface 386. The motor 4 moves synchronously with the slide 3 and drives the first drive wheel 32 via the second drive wheel 41. An adjustment bolt 389 is also provided on the upper portion of the motor 4 for adjusting the relative height of the motor 4 and the motor mounting plate 384, and for adjusting the tension of the transmission belt 42 between the first drive wheel 32 and the second drive wheel 41.

[0031] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A single-cylinder driven injection molding mechanism, characterized in that: Including hydraulic cylinder, machine base, slide, motor, injection head and push rod, The center of the base has an accommodating cavity, the rear portion has a first through hole, the front portion has a second through hole, and the slide is arranged in the accommodating cavity; The hydraulic cylinder is connected to the rear of the machine base and is connected to the slide seat through the first through hole, and the injection head is connected to the front of the machine base; The machine base is provided with a slide rail, and the slide base has a slider that cooperates with the slide rail; A rotating shaft is provided in the slide, and a first driving wheel is provided on the rotating shaft. One end of the push rod is connected to the rotating shaft, and the other end extends into the injection head. The motor is mounted on the slide and is provided with a second drive wheel, the second drive wheel being connected to the first drive wheel via a transmission belt; The axes of the hydraulic cylinder, the rotating shaft and the push rod are located on the same straight line.

2. The single-cylinder driven injection molding mechanism according to claim 1, characterized in that: The sliding seat is provided with a rotating shaft cavity, and the rotating shaft is arranged in the rotating shaft cavity; a disc portion is formed in the center of the rotating shaft, the rear end of the disc portion forms a first step, and the front end forms a second step, the first step is installed with a plane bearing, and the second step is installed with an inclined bearing.

3. The single-cylinder driven injection molding mechanism according to claim 2, characterized in that: A first mounting hole is provided at the rear end of the rotating shaft cavity, and a first mounting portion is provided at the rear end of the rotating shaft. The first mounting portion is connected to the first mounting hole via a ball bearing.

4. The single-cylinder driven injection molding mechanism according to claim 1, characterized in that: The push rod of the hydraulic cylinder is connected to the slide seat through a connecting plate, wherein a mounting groove is provided on the back of the connecting plate and a first mounting protrusion is provided on the front, and the mounting groove and the first mounting protrusion are coaxially arranged; the push rod of the hydraulic cylinder extends into the mounting groove, and the first mounting protrusion extends into the first mounting hole.

5. The single-cylinder driven injection molding mechanism according to claim 4, characterized in that: The hydraulic cylinder is provided with a second mounting protrusion ring, and the second mounting protrusion ring extends into the first through hole; the first through hole is also provided with an avoidance cavity, and the connecting disk can enter the avoidance cavity.

6. The single-cylinder driven injection molding mechanism according to claim 1, characterized in that: A feeding cavity is provided in the injection head, a feeding port is provided on the side of the feeding cavity, and a discharge port is provided at the end; the push rod is located in the feeding cavity and has a thread on its surface.

7. The single-cylinder driven injection molding mechanism according to claim 1, characterized in that: A connecting platform is provided on the top of the slide, and the slider is connected to the slide through the connecting platform; the connecting platform includes a horizontal plate, a first vertical plate and a second vertical plate, and the slider is provided at the four corners of the bottom of the horizontal plate, the first vertical plate extends upward from the front end surface of the slide to the bottom surface of the horizontal plate, and the second vertical plate extends upward from the rear end surface of the slide to the bottom surface of the horizontal plate; an upwardly protruding motor mounting plate is provided on the horizontal plate.

8. The single-cylinder driven injection molding mechanism according to claim 7, characterized in that: A reinforcing plate extending in the front-rear direction is provided in the center of the first vertical plate.

9. The single-cylinder driven injection molding mechanism according to claim 7, characterized in that: The motor mounting plate has a mounting surface for connecting the motor, and a vertically arranged limiting plate is provided on the outer side of the mounting surface; the mounting surface is provided with screw holes.

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