High-precision mold closing structure of automobile exterior trimming part injection mold

Abstract

The utility model discloses a high-precision mold closing structure of an automobile exterior trimming part injection mold. The high-precision mold closing structure comprises a base, a top plate is arranged above the base, a movable plate is installed below the top plate, a lower mold is installed on the upper end face of the base, and an upper mold is arranged on the lower end face of the movable plate. The threaded rods are arranged at the four corners between the base and the top plate, and the threaded rods penetrate through the movable plate; the transmission mechanism is arranged at the upper end of the base, a driven bevel gear is installed at the end, located in the transmission mechanism, of a threaded rod, a gear motor is fixedly installed in the middle of the upper end of the transmission mechanism, a driving bevel gear is installed on an output shaft of the gear motor, and transmission shafts are installed on the periphery of the driving bevel gear. And transmission bevel gears are mounted at the two ends of the transmission shaft. The problem that the mold closing precision of the automobile exterior trimming part injection mold is reduced along with long-time use is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile exterior decoration injection molding, in particular to a high-precision mold clamping structure of an automobile exterior decoration injection molding mold. Background Art

[0002] The mold closing structure of the injection mold for automobile exterior parts mainly consists of a movable mold and a fixed mold. The movable mold is installed on the movable plate of the injection molding machine, while the fixed mold is installed on the fixed plate of the injection molding machine. When the injection molding machine is working, the movable mold and the fixed mold are closed to form a complete mold cavity, in which the plastic melt is injected and cooled and solidified. When the molds are separated, the molded automobile exterior parts remain on the side of the movable mold and are then ejected by the demoulding mechanism set in the movable mold.

[0003] For example, the Chinese authorized patent "A high-precision automobile injection mold" with announcement number CN205871073U includes an upper mold, an upper mold, a lower mold and a lower mold, and the upper mold and the lower mold form a cavity when the mold is closed. The high-precision automobile injection mold also includes a main runner, a branch runner and a buffer cavity. The main runner is connected to the injection molding machine positioning hole, the branch runner is connected to the cavity, and the buffer cavity is connected to the main runner and the branch runner respectively; by adding a buffer cavity between the main runner and the branch runner, when the molten plastic enters the buffer cavity, the flow rate and pressure of the fluid can be greatly reduced, the probability of the appearance of stamping marks on transparent injection molded parts is reduced, and the precision of the injection molded parts is improved.

[0004] Although the above-mentioned prior art can realize the injection molding of automobile exterior parts, the screw will lack lubricating oil after long-term use, which will increase its movement resistance and make the movement not smooth. This will affect the opening and closing speed and force control of the mold during the mold closing process, and further affect the precision of the mold closing. At the same time, the screw may also wear due to friction. Long-term wear will further reduce the movement precision of the screw, making it difficult for the mold to achieve the expected precision requirements during mold closing. Therefore, it does not meet the existing needs. In this regard, we propose a high-precision mold closing structure for automobile exterior parts injection molds. Utility Model Content

[0005] The utility model aims to provide a high-precision mold clamping structure for an automobile exterior trim injection mold, so as to solve the problem that the mold clamping precision of the automobile exterior trim injection mold proposed in the above background technology will decrease with long-term use.

[0006] To achieve the above object, the utility model provides the following technical solution: a high-precision mold clamping structure for an injection mold for an automobile exterior trim, comprising a base, a top plate disposed above the base, a movable plate installed below the top plate, a lower mold installed on the upper end surface of the base, an upper mold disposed on the lower end surface of the movable plate, and the upper mold is adapted to the lower mold; and further comprising:

[0007] A threaded rod, which is arranged at the four corners between the base and the top plate, and the two ends of the threaded rod are rotatably connected to the base and the top plate respectively, the threaded rod passes through the movable plate, and the external thread of the threaded rod is threadedly matched with the internal screw holes of the sliders around the movable plate;

[0008] A transmission mechanism is arranged at the upper end of the base, a driven bevel gear is installed at one end of the threaded rod located inside the transmission mechanism, a reduction motor is fixedly installed at the middle position of the upper end of the transmission mechanism, a driving bevel gear is installed on the output shaft of the reduction motor, and the driving bevel gear is located inside the transmission mechanism, a transmission shaft is installed around the driving bevel gear, and transmission bevel gears are installed at both ends of the transmission shaft, the transmission bevel gear on one side is meshed with the driving bevel gear, and the transmission bevel gear on the other side is meshed with the driven bevel gear.

[0009] Preferably, sockets are provided on both sides of the upper end of the base, four touch sensors distributed in a ring are provided inside the sockets, a pressure sensor is installed below the sockets, and detection rods are fixedly installed on both sides of the bottom of the movable plate, and the detection rods are plugged into the sockets.

[0010] Preferably, a spring is installed at the bottom of the jack, and two ends of the spring are respectively fixed to the pressure sensor and the base.

[0011] Preferably, lubrication mechanisms are provided at the front and rear of both sides of the top plate, a small pump is installed on one side inside the lubrication mechanism, a brush is provided on the pipeline at one end of the oil outlet of the small pump, and the brush is in contact with the upper end of the threaded rod.

[0012] Preferably, a screw cap is installed on the upper end of the lubricating mechanism, and the screw cap is threadedly connected to the lubricating mechanism.

[0013] Preferably, injection mechanisms are fixedly installed on both sides of the upper end surface of the movable plate, and the discharge ports of the injection mechanisms are connected to the upper mold.

[0014] Preferably, the signal output ends of the touch sensor and the pressure sensor are connected to a processor, and the output end of the processor is connected to a reduction motor.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model adopts a coaxial drive structure. By turning on the reduction motor, its output shaft will drive the driving bevel gear to rotate. Under the meshing with the driving bevel gear at one end of the transmission shaft, the rotation of four transmission shafts is synchronously formed, and the driving bevel gear at the other end of the transmission shaft drives the threaded rod to rotate under the meshing with the driven bevel gear. The external thread of the threaded rod is adapted to the internal screw hole of the slider around the movable plate. With the limiting effect of the four threaded rods on the movable block, the rotary motion is converted into linear motion, and then the upper mold is driven downward through the movable plate to achieve precise mold closing with the lower mold. The mechanism adopts coaxial drive to ensure the synchronous rotation of the four transmission shafts, which greatly improves the synchronization and stability of mold closing. The synchronous rotation can ensure that the upper mold is evenly stressed during the mold closing process, avoiding mold closing deviation or mold damage caused by uneven force. Through precise gear meshing and thread matching, the coaxial drive structure can accurately convert the rotary motion into linear motion to achieve precise mold closing of the upper mold and the lower mold. This high-precision motion conversion enhances the reliability and repeatability of mold closing.

[0017] 2. The utility model provides jacks on both sides of the interior of the base, and installs detection rods on both sides of the bottom of the movable plate. During the mold closing process of the upper mold and the lower mold, the detection rod will enter the interior of the jack. While ensuring accuracy, the detection rod will not contact the touch sensor. At the same time, after the mold is closed, the pressure value caused by the bottom of the detection rod on the pressure sensor remains the same. If the detection rod contacts the touch sensor during the mold closing process, or the values ​​detected by the two pressure sensors are different, it indicates that there is an error in the mold closing accuracy of the device, so the device is shut down in time and the staff is notified for maintenance to avoid the production of defective products and thus cause economic losses.

[0018] 3. The utility model is provided with a lubrication mechanism, and the lubricating oil inside the lubrication mechanism is transported to the pipe at one end of the small pump by regularly starting the small pump, and then gradually penetrates toward the brush through the pipe. The brush penetrated by the lubricating oil can transfer it to the upper end of the threaded rod. With the rotation of the threaded rod and the gravity of the lubricating oil, it will gradually distribute to the upper and lower parts of the threaded rod and the connection with the movable plate, thereby avoiding the problem of increased movement resistance and unsmooth movement due to lack of lubricating oil, which leads to reduced movement accuracy of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of the transmission mechanism of the utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the jack of the utility model;

[0022] Figure 4It is a schematic diagram of the internal structure of the lubrication mechanism of the utility model.

[0023] In the figure: 1. base; 2. top plate; 3. movable plate; 4. lower mold; 5. upper mold; 6. transmission mechanism; 7. reduction motor; 8. threaded rod; 9. injection mechanism; 10. detection rod; 11. socket; 12. lubrication mechanism; 13. driving bevel gear; 14. transmission shaft; 15. transmission bevel gear; 16. driven bevel gear; 17. touch sensor; 18. pressure sensor; 19. spring; 20. small pump; 21. brush. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] See also Figure 1-4 The utility model provides an embodiment: a high-precision mold clamping structure of an automobile exterior molding injection mold, comprising a base 1, a top plate 2 is arranged above the base 1, a movable plate 3 is installed below the top plate 2, a lower mold 4 is installed on the upper end surface of the base 1, an upper mold 5 is arranged on the lower end surface of the movable plate 3, and the upper mold 5 is adapted to the lower mold 4; and further comprising:

[0026] The threaded rod 8 is arranged at the four corners between the base 1 and the top plate 2, and the two ends of the threaded rod 8 are rotatably connected to the base 1 and the top plate 2 respectively, the threaded rod 8 passes through the movable plate 3, and the external thread of the threaded rod 8 is threadedly matched with the internal screw holes of the sliders around the movable plate 3;

[0027] A transmission mechanism 6 is arranged at the upper end of the base 1, and a driven bevel gear 16 is installed at one end of the threaded rod 8 located inside the transmission mechanism 6. A reduction motor 7 is fixedly installed at the middle position of the upper end of the transmission mechanism 6. A driving bevel gear 13 is installed on the output shaft of the reduction motor 7, and the driving bevel gear 13 is located inside the transmission mechanism 6. A transmission shaft 14 is installed around the driving bevel gear 13, and transmission bevel gears 15 are installed at both ends of the transmission shaft 14. The transmission bevel gear 15 on one side is meshed with the driving bevel gear 13, and the transmission bevel gear 15 on the other side is meshed with the driven bevel gear 16.

[0028] The mechanism adopts coaxial drive to ensure the synchronous rotation of the four transmission shafts 14, which greatly improves the synchronization and stability of the mold closing. The synchronous rotation can ensure that the upper mold 5 is evenly stressed during the mold closing process, avoiding mold closing deviation or mold damage caused by uneven force. Through precise gear meshing and thread matching, the coaxial drive structure can accurately convert rotational motion into linear motion, thereby realizing precise mold closing of the upper mold 5 and the lower mold 4. This high-precision motion conversion enhances the reliability and repeatability of mold closing.

[0029] See also Figure 1 and Figure 3 , both sides of the upper end of the base 1 are provided with sockets 11, four touch sensors 17 distributed in a ring shape are provided inside the socket 11, a pressure sensor 18 is installed below the socket 11, and detection rods 10 are fixedly installed on both sides of the bottom of the movable plate 3, and the detection rods 10 are plugged into the sockets 11 to monitor the position of the detection rods 10, thereby avoiding the production of defective products and causing economic losses.

[0030] See also Figure 3 A spring 19 is installed at the bottom of the jack 11 , and both ends of the spring 19 are respectively fixed to the pressure sensor 18 and the base 1 , providing a supporting space for the pressure sensor 18 .

[0031] See also Figure 1 and Figure 4 Lubrication mechanisms 12 are provided at the front and rear of both sides of the top plate 2, and a small pump 20 is installed on one side inside the lubrication mechanism 12. A brush 21 is provided at the pipeline at one end of the oil outlet of the small pump 20, and the brush 21 is in contact with the upper end of the threaded rod 8 to avoid the problem of increased movement resistance and unsmooth movement due to lack of lubricating oil, which leads to reduced movement accuracy of the screw.

[0032] See also Figure 1 and Figure 4 A screw cap is installed at the upper end of the lubricating mechanism 12, and the screw cap is threadedly connected to the lubricating mechanism 12, so as to facilitate the replenishment of lubricating oil to the lubricating mechanism 12.

[0033] See also Figure 1 Injection mechanisms 9 are fixedly installed on both sides of the upper end surface of the movable plate 3, and the discharge port of the injection mechanism 9 is connected to the upper mold 5.

[0034] Furthermore, the signal output ends of the touch sensor and the pressure sensor are connected to the processor, and the output end of the processor is connected to the reduction motor.

[0035] Working principle: When in use, by turning on the reduction motor 7, its output shaft will drive the driving bevel gear 13 to rotate, and under the meshing with the driving bevel gear 15 at one end of the transmission shaft 14, the four transmission shafts 14 will rotate synchronously, and the driving bevel gear 15 at the other end of the transmission shaft 14 will drive the threaded rod 8 to rotate under the meshing with the driven bevel gear 16. The external thread of the threaded rod 8 is adapted to the internal threaded holes of the sliders around the movable plate 3, and the four threaded rods 8 cooperate with the limiting effect of the movable block 3 to convert the rotational motion into linear motion, and then drive the upper mold 5 to move downward through the movable plate 3 to achieve accurate mold closing with the lower mold 4. If there is a problem during the mold closing process, When the detection rod 10 contacts the touch sensor 17, or the values ​​detected by the two pressure sensors 18 are different, it means that there is an error in the mold clamping accuracy of the device, so the machine is shut down in time and the staff is notified for maintenance. By starting the small pump 20 at a fixed time, the lubricating oil inside the lubrication mechanism 12 is transported to the pipe at one end of the small pump 20, and then gradually penetrates toward the brush 21 through the pipe. The brush 21 penetrated by the lubricating oil can transfer it to the upper end of the threaded rod 8. As the threaded rod 8 rotates and the gravity of the lubricating oil, it will gradually be distributed above and below the threaded rod 8 and at the connection with the movable plate 3, thereby avoiding the increase of its movement resistance due to lack of lubricating oil.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A high-precision mold-clamping structure for an automobile exterior molding injection mold, comprising a base (1), a top plate (2) being arranged above the base (1), a movable plate (3) being installed below the top plate (2), a lower mold (4) being installed on the upper end surface of the base (1), an upper mold (5) being arranged on the lower end surface of the movable plate (3), and the upper mold (5) being adapted to fit the lower mold (4); Features: Also includes: A threaded rod (8) is arranged at four corners between the base (1) and the top plate (2), and two ends of the threaded rod (8) are rotatably connected to the base (1) and the top plate (2), respectively; the threaded rod (8) passes through the movable plate (3), and the external thread of the threaded rod (8) is threadably matched with the internal thread holes of the sliders around the movable plate (3); A transmission mechanism (6) is arranged at the upper end of the base (1); a driven bevel gear (16) is installed at one end of the threaded rod (8) located inside the transmission mechanism (6); a reduction motor (7) is fixedly installed at the middle position of the upper end of the transmission mechanism (6); a driving bevel gear (13) is installed on the output shaft of the reduction motor (7); and the driving bevel gear (13) is located inside the transmission mechanism (6); a transmission shaft (14) is installed around the driving bevel gear (13); and the transmission shaft (14) is Transmission bevel gears (15) are installed at both ends, the transmission bevel gear (15) on one side is meshed with the driving bevel gear (13), and the transmission bevel gear (15) on the other side is meshed with the driven bevel gear (16), lubrication mechanisms (12) are arranged at the front and rear of both sides of the top plate (2), a small pump (20) is installed at one side inside the lubrication mechanism (12), a brush (21) is arranged at the pipeline at one end of the oil outlet of the small pump (20), and the brush (21) is in contact with the upper end of the threaded rod (8).

2. The high-precision mold clamping structure of the automobile exterior molding injection mold according to claim 1, characterized in that: Both sides of the upper end of the base (1) are provided with plug holes (11), the inside of the plug holes (11) are provided with four touch sensors (17) distributed in a ring shape, a pressure sensor (18) is installed below the inside of the plug holes (11), and detection rods (10) are fixedly installed on both sides of the bottom of the movable plate (3), and the detection rods (10) are plugged into and matched with the plug holes (11).

3. The high-precision mold clamping structure of the automobile exterior molding injection mold according to claim 2, characterized in that: A spring (19) is installed at the bottom of the jack (11), and two ends of the spring (19) are respectively fixed to the pressure sensor (18) and the base (1).

4. The high-precision mold clamping structure of the automobile exterior molding injection mold according to claim 1, characterized in that: A screw cap is installed at the upper end of the lubricating mechanism (12), and the screw cap is threadably connected to the lubricating mechanism (12).

5. The high-precision mold clamping structure of the automobile exterior molding injection mold according to claim 1, characterized in that: Injection mechanisms (9) are fixedly mounted on both sides of the upper end surface of the movable plate (3), and the discharge port of the injection mechanism (9) is connected to the upper mold (5).

6. The high-precision mold clamping structure of the automobile exterior molding injection mold according to claim 2, characterized in that: The signal output ends of the touch sensor (17) and the pressure sensor (18) are connected to the processor, and the output end of the processor is connected to the reduction motor (7).

Images