A tie rod stringing device for large injection molding machines

Abstract

The present invention discloses a tie rod stringing device for a large injection molding machine, comprising a positioning platform, a tie rod stringing device, and a control device. The tie rod stringing device comprises a first base, a plurality of first transverse slide rails are provided on the first base, a first sliding seat is provided on the first transverse slide rail, a first hydraulic cylinder for driving the first sliding seat to slide is provided on the first base, a first vertical slide rail is provided on the side of the first sliding seat, a second sliding seat is slidably provided on the first vertical slide rail, a second hydraulic cylinder for driving the second sliding seat to slide is provided on the first sliding seat, a tie rod pushing mechanism is provided on at least one side of the second sliding seat, and displacement sensors are provided in the first hydraulic cylinder, the second hydraulic cylinder, and the third hydraulic cylinder. This tie rod stringing device for a large injection molding machine can realize automatic alignment and assembly of tie rods, improve assembly efficiency, and reduce labor intensity of workers.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machine assembly devices, in particular to a pull rod string assembly device for a large injection molding machine. Background Art

[0002] The typical structure of an injection molding machine consists of a safety door, a mold clamping mechanism, an injection mechanism, a hydraulic transmission mechanism, a lubrication system, a machine body, and an electrical control unit. The mold clamping mechanism typically consists of three platens and four parallel tie rods interspersed between them. This heavy mechanism can weigh around 50 tons per platen, and around 10 tons per tie rod, depending on the machine model, making assembly challenging.

[0003] The traditional assembly process is as follows: 1) Workers use a crane or other tool to lift the tail plate to a fixed position, then lift the middle plate and head plate to positions opposite to the tail plate, and then fix the head plate, middle plate, and tail plate; 2) Use the crane to lift a tie rod, clean the tie rod and apply lubricant to it. Then, with the help of the crane, manually pass the tie rod through the tie rod holes of the tail plate, middle plate, and head plate in turn. During the insertion process, the tie rod holes of the head plate, middle plate, and tail plate may not be concentric, so manual drilling is required. During this process, the positions of the three templates are constantly fine-tuned. Meanwhile, the rod insertion process requires the collaboration of multiple assembly workers, who repeatedly tap the ends of the tie rods with copper rods to provide momentum for the rod penetration. 3) Repeat step 2 until all four tie rods are inserted into the corresponding tie rod holes in the three templates. 4) Manually select the mold adjustment nut onto the threaded section of the tie rod. 5) Then, install the connecting rods into both the middle and tail plates, aligning the connecting rod's locking shaft holes. Finally, hammer the locking shaft into the connection between the locking shaft holes. Traditionally, assembly of the mold clamping mechanism of injection molding machines is largely manual, which is labor-intensive and inefficient.

[0004] The above-mentioned string assembly of the tie rods of the injection molding machine relies entirely on manual operation, which is labor-intensive and inefficient. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a large-scale injection molding machine tie rod stringing device that can realize automatic alignment and assembly of tie rods, improve assembly efficiency, and reduce workers' labor intensity.

[0006] In order to solve the above technical problems, the present invention is solved through the following technical solutions: a large injection molding machine pull rod stringing device, including a positioning platform, a pull rod stringing device and a control device. The pull rod stringing device includes a first base, a plurality of first horizontal slide rails are provided on the first base, a first sliding seat is provided on the first horizontal slide rail, a first hydraulic cylinder that drives the first sliding seat to slide is provided on the first base, a first vertical slide rail is provided on the side of the first sliding seat, a second sliding seat is slidably provided on the first vertical slide rail, a second hydraulic cylinder that drives the second sliding seat to slide is provided on the first sliding seat, and a pull rod pushing mechanism is provided on at least one side of the second sliding seat. The pull rod pushing mechanism includes a first longitudinal slide rail located on the second sliding seat, a sliding plate is slidably provided on the first longitudinal slide rail, a third hydraulic cylinder that drives the sliding plate to slide is provided on the second sliding seat, a group of guide wheels parallel to the sliding plate are provided on the second sliding seat, a limiting mechanism that pushes the pull rod to move is provided on the sliding plate, and displacement sensors are provided in the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder. This type of injection molding machine assembly all-in-one machine can realize automatic alignment and assembly of tie rods, improve assembly efficiency and reduce labor intensity of workers.

[0007] In the above technical solution, preferably, the sliding plate is provided with a plurality of evenly distributed limiting mechanisms, each comprising a rotating cylinder and a rotating arm, the rotating arm having a limiting position at the top of the tie rod and a retracted position located outside the top of the tie rod. This structure enables multi-stage feeding and conveying through the sliding cooperation between the limiting mechanisms and the sliding plate, reducing the length of a single feed, thereby effectively shortening the stroke of the third hydraulic cylinder and reducing the overall length of the machine.

[0008] In the above technical solution, preferably, a push rod is provided on the rotating cylinder closest to the positioning platform. This structure effectively utilizes the space on the side of the rotating cylinder closest to the positioning platform, so that the push rod can complete the final push rod operation, saving one rotating cylinder and shortening the length of the sliding plate.

[0009] In the above technical solution, preferably, both sides of the second sliding seat are provided with a pull rod pushing mechanism. The use of this structure reduces the stroke of the first sliding seat, thereby reducing the volume of the entire machine.

[0010] In the above technical solution, preferably, the positioning platform is provided with a tail plate positioning block, a middle plate positioning block, and a head plate positioning block, and the middle plate positioning block is slidably connected to the positioning platform via a fourth longitudinal slide rail. This structure enables the middle plate positioning block to move, thereby facilitating the installation of the connecting rod between the middle plate and the tail plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects: the tie rod string assembly device for a large injection molding machine can realize automatic alignment and assembly of the tie rods, thereby improving assembly efficiency and reducing labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention.

[0013] Figure 2 Schematic diagram of the structure of the positioning platform in an embodiment of the present invention.

[0014] Figure 3 Schematic diagram of the structure of the pull rod string installation device in an embodiment of the present invention.

[0015] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0016] Figure 5 Schematic diagram of the structure of the automatic rotating device for the mold adjusting nut in an embodiment of the present invention.

[0017] Figure 6 Schematic diagram of the structure of the sixth sliding seat in an embodiment of the present invention.

[0018] Figure 7 Schematic diagram of the structure of the positioning mechanism in an embodiment of the present invention.

[0019] Figure 8 Schematic diagram of the cross-sectional structure of the positioning mechanism after installation in an embodiment of the present invention.

[0020] Figure 9 It is a schematic cross-sectional structural diagram of the positioning mechanism in the embodiment of the present invention in the positioning state after installation.

[0021] Figure 10 Schematic diagram of the structure of the calibration device in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments: Figures 1 to 10A large-scale injection molding machine tie rod stringing device includes a positioning platform 1, a tie rod stringing device 2, an automatic screw-in device 3 for adjusting the mold nut, a connecting rod lock shaft installation device 4 and a control device. The tie rod stringing device 2 includes a first base 21, a plurality of first transverse slide rails 22 are provided on the first base 21, a first sliding seat 23 is provided on the first transverse slide rail 22, a first hydraulic cylinder 24 for driving the first sliding seat 23 to slide is provided on the first base 21, a first vertical slide rail 25 is provided on the side of the first sliding seat 23, a second sliding seat 26 is slidably provided on the first vertical slide rail 25, and a second hydraulic cylinder 2 is provided on the first sliding seat 23 to drive the second sliding seat 26 to slide. 7. A pull rod pushing mechanism 28 is provided on at least one side of the second sliding seat 26. The pull rod pushing mechanism 28 includes a first longitudinal slide rail 29 located on the second sliding seat 26. A sliding plate 210 is slidingly provided on the first longitudinal slide rail 29. The second sliding seat 26 is provided with a third hydraulic cylinder 211 for driving the sliding plate 210 to slide. The second sliding seat 26 is provided with a group of guide wheels 212 parallel to the sliding plate 210. The sliding plate 210 is provided with a limiting mechanism 213 for pushing the pull rod 5 to move. Displacement sensors are provided in the first hydraulic cylinder 24, the second hydraulic cylinder 27 and the third hydraulic cylinder 211; the automatic screw-mounting device 3 for adjusting the mold nut The utility model comprises a second base 31, a second longitudinal slide rail 32 is provided on the second base 31, a third slide seat 33 is provided on the second longitudinal slide rail 32, a fourth hydraulic cylinder 34 for driving the third slide seat 33 to slide is provided on the second base 31, a second transverse slide rail 35 is provided on the third slide seat 33, a fourth slide seat 36 is provided on the second transverse slide rail 35, a fifth hydraulic cylinder 37 for driving the fourth slide seat 36 to slide is provided on the third slide seat 33, a second vertical slide rail 38 is provided on the fourth slide seat 36, a fifth slide seat 39 is provided on the second vertical slide rail 38, and a sixth hydraulic cylinder 37 for driving the fifth slide seat 39 to slide is provided on the fourth slide seat 36. Cylinder 310, the fifth sliding seat 39 is provided with a third longitudinal slide rail 311, the third longitudinal slide rail 311 is provided with a sixth sliding seat 312, the fifth sliding seat 39 is provided with a first cylinder 313 that drives the sixth sliding seat 312 to slide, the sixth sliding seat 312 is provided with a pair of parallel rotating rollers 314 for placing the mold adjustment nut 6, the sixth sliding seat 312 is provided with a third transverse slide rail 315, the third transverse slide rail 315 is provided with a seventh sliding seat 316, the seventh sliding seat 316 is provided with a positioning mechanism 317, the seventh sliding seat 316 is provided with a hydraulic motor 318, and the output shaft of the hydraulic motor 318 is provided with a gear 319;The connecting rod lock shaft installation device 4 includes a rotating seat 41 rotatably mounted on a fifth sliding seat 39. The fifth sliding seat 39 is equipped with a rotating hydraulic cylinder 42 that drives the rotating seat 41. The rotating seat 41 is provided with a lock shaft sliding groove 43. A pneumatic impact hammer 44 is installed at the end of the lock shaft sliding groove 43. An impact rod 45 is slidably mounted between the pneumatic impact hammer 44 and the lock shaft sliding groove 43. This large-scale injection molding machine tie rod assembly device enables automatic alignment and assembly of tie rods, automatic alignment and automatic screwing of mold adjustment nuts, and manual alignment and automatic punching of lock shafts, improving assembly efficiency and reducing worker labor intensity.

[0023] The sliding plate 210 is equipped with several evenly distributed limiting mechanisms 213. These limiting mechanisms 213 include a rotating cylinder 214 and a rotating arm 215. The rotating arm 215 has a limiting position at the top of the tie rod 5 and a retracted position located outside the top of the tie rod 5. This structure enables multi-stage feeding and conveying through the sliding cooperation between the limiting mechanisms and the sliding plate, reducing the length of a single feed, thereby effectively shortening the stroke of the third hydraulic cylinder and reducing the overall length of the machine. In this embodiment, the sliding plate is equipped with five evenly distributed rotating cylinders.

[0024] A push rod 216 is provided on the side of the rotating cylinder 214 closest to the positioning platform 1. This structure effectively utilizes the space on the side of the rotating cylinder closest to the positioning platform, so that the last push rod operation is completed by the push rod, saving a rotating cylinder and shortening the length of the sliding plate.

[0025] A notch 320 is provided in the middle of the pair of rotating rollers 314, and the gear 319 is located within the gap 320. This structure allows the gear on the nut to be axially limited within the notch when the nut is mounted on the rotating roller, thereby preventing the nut from sliding axially.

[0026] A pull rod pushing mechanism 28 is provided on both sides of the second sliding seat 26. This structure reduces the stroke of the first sliding seat and reduces the volume of the whole machine.

[0027] The automatic screw-mounting device 3 for the mold-adjusting nut is provided on both sides of the positioning platform 1 .

[0028] The connecting rod locking shaft installation device 4 is provided on both sides of the positioning platform 1 .

[0029] The positioning platform 1 is provided with a tail plate positioning block 11, a middle plate positioning block 12, and a head plate positioning block 13. The middle plate positioning block 12 is slidably connected to the positioning platform 1 via a fourth longitudinal slide rail 14. This structure enables the middle plate positioning block to move, thereby facilitating the installation of the connecting rod between the middle plate and the tail plate.

[0030] The positioning platform 1 is provided with a positioning slot 15 near the first base 21. A calibration device 7 is detachably provided on the positioning slot 15. The calibration device 7 comprises a mutually perpendicular horizontal beam 71 and vertical beam 72, and a positioning block 73 that cooperates with the positioning slot 15. Both the horizontal beam 71 and the vertical beam 72 are provided with a digital display vernier caliper 74. This structure allows the positioning platform and the rod stringing device to be aligned when the all-in-one device is used for the first time, calibrating the initial coordinate position of the rod stringing device to ensure that the rods can be accurately installed.

[0031] The end of the lock shaft sliding groove 43 is provided with a push block 46. After the pneumatic impact hammer hammers the lock shaft into the lock shaft hole of the connecting rod, the lock shaft cannot be pushed into the lock shaft hole due to the short stroke of the pneumatic impact hammer. Therefore, the lock shaft is pushed into the lock shaft hole through the movement of the fifth sliding seat and the cooperation of the push block.

[0032] The positioning mechanism 317 includes a through hole 3171, a guide sleeve 3172, a positioning rod 3173, a spring 3174, a U-shaped positioning block 3175 and a nut 3176 arranged on the seventh sliding seat 316. The guide sleeve 3172 is fixed in the through hole 3171. The fixing structure is that the lower end of the guide sleeve 3172 is larger than the upper end. The U-shaped positioning block 3175 is fixed on the seventh sliding seat 316. The upper end of the guide sleeve 3172 is threadedly fitted with a nut 3176. The guide sleeve 3172 is fixed to the U-shaped positioning block 3175 through the nut 3176 and the lower end of the guide sleeve 3172. The positioning rod 3173 is passed through the guide sleeve 3172. A locking block 3177 is provided at the bottom of the positioning rod 3173. The cross-section of the locking block 3177 is larger than that of the guide sleeve 3172. The locking block 3177 is aligned with the guide sleeve 3172. A spring 3174 is arranged between the sleeves 3172, a shallow groove 3178 and a deep groove 3179 are arranged on the top of the guide sleeve 3172, and a limiting rod 31710 is arranged on the upper end of the positioning rod 3173. When the limiting rod 31710 is located in the shallow groove 3178, there is a gap between the locking block 3177 and the sixth sliding seat 312. When the limiting rod 31710 is located in the deep groove 3179, the locking block 3177 presses against the sixth sliding seat 312, thereby achieving a positioning effect.

[0033] The working process of the tie rod string installation device of a large injection molding machine includes: 1. placing the tail plate, middle plate and head plate of the injection molding machine on the tail plate positioning block, middle plate positioning block and head plate positioning block respectively to align and position the tie rod perforations; 2. performing calibration operation: the positioning block of the calibration device is matched with the positioning slot to fix the calibration device, and the tie rod is placed on a set of guide wheels, and the first sliding seat and the second sliding seat are adjusted by sliding, the rotating arm supports the end of the tie rod, and the sliding plate is moved to allow the tie rod to penetrate into the calibration device, and the position of the first sliding seat and the second sliding seat is read and adjusted by the digital vernier caliper to find the coordinate zero point position. The calibration operation only needs to be calibrated once when the assembly machine is first installed; 3. The tie rod is placed on a set of guide wheels and the first sliding seat and the second sliding seat are moved to And the pull rod pushing mechanism pushes the pull rod into the pull rod through-holes of the tail plate, middle plate and head plate; 4. A gear ring is processed on the outside of the mold adjusting nut, and the width of the gear ring corresponds to the width of the notch in the rotating roller. A cylindrical ring is put on one side of the mold adjusting nut and then placed on the rotating roller (putting on the cylindrical ring increases the contact length with the rotating roller to prevent the mold adjusting nut from tilting), the gear ring is placed in the notch, and the seventh sliding seat is moved so that the gear is meshed with the gear ring and the seventh sliding seat is fixed to the sixth sliding seat through the positioning mechanism, and then the third sliding seat, fourth sliding seat, fifth sliding seat and sixth sliding seat are adjusted to put the mold adjusting nut onto the pull rod, and the mold adjusting nut is screwed into the threaded section of the pull rod by the push of the first cylinder and the rotation of the hydraulic motor, and then the withdrawal operation is performed and the cylindrical ring is removed. 5. Install the connecting rod on the tail plate and the middle plate, align the lock shaft holes on the connecting rod, place the lock shaft into the lock shaft sliding groove, adjust the third sliding seat, fourth sliding seat, fifth sliding seat and rotating seat to align the lock shaft with the lock shaft hole, start the pneumatic impact hammer to hammer the lock shaft into the lock shaft hole, then retreat and adjust the position to align the top block with the lock shaft hammered into the lock shaft hole, and use the thrust of the fifth hydraulic cylinder to fully insert the lock shaft into the lock shaft hole.

Claims

1. A tie rod stringing device for a large injection molding machine, characterized by: The invention comprises a positioning platform (1), a pull rod stringing device (2) and a control device, wherein the pull rod stringing device (2) comprises a first base (21), a plurality of first transverse slide rails (22) are provided on the first base (21), a first sliding seat (23) is provided on the first transverse slide rail (22), a first hydraulic cylinder (24) for driving the first sliding seat (23) to slide is provided on the first base (21), a first vertical slide rail (25) is provided on the side of the first sliding seat (23), a second sliding seat (26) is slidably provided on the first vertical slide rail (25), a second hydraulic cylinder (27) for driving the second sliding seat (26) to slide is provided on the first sliding seat (23), a pull rod pushing mechanism (28) is provided on at least one side of the second sliding seat (26), and the pull rod pushing mechanism (28) comprises a first longitudinal slide rail (29) located on the second sliding seat (26), a first longitudinal slide rail (29) is provided on the sliding seat (29), and a second hydraulic cylinder (27) for driving the second sliding seat (26) to slide is provided on the first sliding seat (23). A sliding plate (210) is provided, a third hydraulic cylinder (211) for driving the sliding plate (210) to slide is provided on the second sliding seat (26), a group of guide wheels (212) parallel to the sliding plate (210) is provided on the second sliding seat (26), a limiting mechanism (213) for pushing the pull rod (5) to move is provided on the sliding plate (210), and displacement sensors are provided in the first hydraulic cylinder (24), the second hydraulic cylinder (27) and the third hydraulic cylinder (211); a plurality of evenly distributed limiting mechanisms (213) are provided on the sliding plate (210), the limiting mechanisms (213) include a rotating cylinder (214) and a rotating arm (215), the rotating arm (215) has a limiting position located at the top of the pull rod (5) and a retracted position located outside the top of the pull rod (5); a push rod (216) is provided on the side of the rotating cylinder (214) closest to the positioning platform (1).

2. A tie rod stringing device for a large injection molding machine according to claim 1, characterized in that: Pull rod pushing mechanisms (28) are provided on both sides of the second sliding seat (26).

3. A tie rod stringing device for a large injection molding machine according to claim 1, characterized in that: The positioning platform (1) is provided with a tail plate positioning block (11), a middle plate positioning block (12) and a head plate positioning block (13), and the middle plate positioning block (12) is slidably connected to the positioning platform (1) via a fourth longitudinal slide rail (14).

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