Planetary injection molding machine driving device and injection molding machine

Abstract

The invention discloses a planetary injection molding machine driving device and an injection molding machine. The planetary injection molding machine driving device comprises a motor assembly and a speed reducer assembly, the speed reducer assembly comprises a speed reducer shell and a planetary gear transmission mechanism, the planetary gear transmission mechanism is installed in the speed reducer shell, the speed reducer shell is fixedly connected with the motor assembly, and the planetary gear transmission mechanism is in transmission connection with an output part of the motor assembly; meshing teeth of the planetary gear transmission mechanism are all provided with herringbone teeth. The transmission efficiency can be improved, the injection molding precision is improved, and noise is reduced.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and more specifically, to a planetary injection molding machine drive device and an injection molding machine. Background Technology

[0002] An injection molding machine is a type of plastic machinery, also known as an injection molding machine or injection molding machine. It is a primary molding device that uses plastic molds to produce various shapes of plastic products from thermoplastic or thermosetting plastics. The injection molding process is achieved through the injection molding machine and the mold. The drive system of an injection molding machine typically uses a hydraulic motor and a gearbox. The torque of the hydraulic motor is transmitted to the gearbox, and the gearbox outputs power after adjusting the speed ratio.

[0003] The inventors discovered that the drive system of the injection molding machine in the relevant technology has at least the following drawbacks: Hydraulic motors have low transmission efficiency; the combination of hydraulic motors and conventional gearboxes results in low injection molding precision and high transmission noise. Summary of the Invention

[0004] The present invention aims to provide, for example, a planetary injection molding machine drive and an injection molding machine that can improve transmission efficiency, improve injection accuracy, and reduce noise.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a planetary injection molding machine drive device, comprising: The motor assembly and the reducer assembly; the reducer assembly includes a reducer housing and a planetary gear transmission mechanism, the planetary gear transmission mechanism is installed inside the reducer housing, the reducer housing is fixedly connected to the motor assembly, and the planetary gear transmission mechanism is drively connected to the output part of the motor assembly; The meshing teeth of the planetary gear transmission mechanism are all equipped with herringbone teeth.

[0006] In an optional embodiment, the herringbone tooth includes a first tooth body and a second tooth body, the inner ends of the first tooth body and the inner ends of the second tooth body are joined together, and the extension directions of the first tooth body and the extension directions of the second tooth body have an angle.

[0007] In an optional embodiment, the first and second teeth of the same herringbone tooth are configured as an integral structure.

[0008] In an optional embodiment, the motor assembly includes a motor housing and a motor body, the motor housing being fixedly connected to the reducer housing; the motor body being fixedly connected to the motor housing, and the rotating shaft of the motor body being configured as a gear shaft, the rotating shaft extending into the reducer housing and meshing with the planetary gear transmission mechanism.

[0009] In an optional embodiment, the planetary gear transmission mechanism includes a gear ring, a planet carrier, and planet gears. The gear ring is fixedly connected to the reducer housing, the planet carrier is rotatably connected to the reducer housing, and the planet gears are rotatably mounted on the planet carrier and mesh with the gear ring. The output section of the motor assembly meshes with the planetary gears.

[0010] In an optional embodiment, the reducer assembly further includes a through cover, which is fixedly connected to the reducer housing, and the output portion passes through the through cover.

[0011] In an optional embodiment, the planetary gear transmission mechanism further includes a retaining ring that is snapped onto the planet carrier; the output portion is provided with a shoulder, and the retaining ring contacts the shoulder to limit the position of the planet carrier relative to the output portion in the axial direction of the output portion.

[0012] In an optional embodiment, the planetary gear transmission mechanism further includes a planetary pin, which is provided with an axial oil passage and a radial oil passage, the radial oil passage communicating with the axial oil passage; the planetary pin is fixed to the planet carrier, and the planetary gear is rotatably connected to the planetary pin.

[0013] In an optional embodiment, the reducer housing includes a front cover, a middle housing, and a rear cover connected in sequence. The edge of the front cover is provided with a positioning groove, and at least a portion of the positioning groove protrudes radially outward from the outer peripheral surface of the middle housing. The positioning groove is used to embed bolts that can connect the front cover to the injection molding machine housing.

[0014] In a second aspect, the present invention provides an injection molding machine, the injection molding machine comprising: The planetary injection molding machine drive device described in any of the foregoing embodiments.

[0015] The beneficial effects of the embodiments of the present invention include, for example: The planetary injection molding machine drive device provided in this embodiment provides power through a motor assembly. The output of the motor assembly rotates, inputting torque into the planetary gear transmission mechanism of the reducer assembly. The planetary gear transmission mechanism adjusts the speed ratio and outputs power, thereby driving the actuators of the injection molding machine, such as twin screws, to rotate, thus performing material conveying operations. Because it uses a motor assembly, it is less prone to oil leakage compared to a hydraulic motor and has higher transmission efficiency. Furthermore, the meshing teeth of the planetary gear transmission mechanism are set as herringbone teeth. When the motor assembly and the planetary gear transmission mechanism work together, the transmission is stable and the noise is low; the herringbone meshing structure provides high transmission precision and injection precision, thereby improving injection molding quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the planetary injection molding machine drive device provided in this embodiment; Figure 2 This is a partial structural schematic diagram of the planetary injection molding machine drive device provided in this embodiment; Figure 3 for Figure 2 A magnified schematic diagram of the local structure; Figure 4 This is a schematic diagram of the structure of the reducer housing provided in this embodiment; Figure 5 This is a cross-sectional structural diagram of the reducer housing provided in this embodiment.

[0018] icon: 100-Motor assembly; 110-Motor housing; 120-Rotating shaft; 121-Shoulder; 200-Reducer assembly; 210-Reducer housing; 211-Front cover; 2111-Positioning groove; 212-Middle housing; 213-Rear cover; 214-Second mounting lug; 2141-Second fixing hole; 220-Planetary gear transmission mechanism; 221-Gear ring; 222-Planet carrier; 2221-External spline; 223-Planet gear; 224-Retaining ring; 225-Planet pin; 2251-Axial oil passage; 2252-Radial oil passage; 226-Support bearing; 227-Meshing tooth; 2271-First tooth body; 2272-Second tooth body; 230-Through cover; 240-Breath valve; 250-Plug. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] Please refer to Figures 1-5 This embodiment provides a planetary injection molding machine drive device, which includes a motor assembly 100 and a reducer assembly 200. The reducer assembly 200 includes a reducer housing 210 and a planetary gear transmission mechanism 220. The planetary gear transmission mechanism 220 is installed inside the reducer housing 210. The reducer housing 210 is fixedly connected to the motor assembly 100, and the planetary gear transmission mechanism 220 is drively connected to the output part of the motor assembly 100. The meshing teeth 227 of the planetary gear transmission mechanism 220 are all provided with herringbone teeth.

[0026] As described above, the working principle of the planetary injection molding machine drive device provided in this embodiment is as follows: The planetary injection molding machine drive unit can be connected to the injection molding machine housing via the reducer housing 210. The output of the planetary gear transmission mechanism 220 of the planetary injection molding machine drive unit is connected to the actuator of the injection molding machine. During operation, the motor assembly 100 is energized, providing power. The output of the motor assembly 100 rotates, inputting torque into the planetary gear transmission mechanism 220 of the reducer assembly 200. After adjusting the speed ratio, the planetary gear transmission mechanism 220 outputs power, thereby driving the actuator of the injection molding machine, such as a twin screw, to rotate, thus performing material conveying operations, etc.

[0027] It should be noted that, due to the use of the motor assembly 100, compared to a hydraulic motor, it is less prone to oil leakage and has higher transmission efficiency. Furthermore, the meshing teeth 227 of the planetary gear transmission mechanism 220 are set as herringbone teeth. When the motor assembly 100 and the planetary gear transmission mechanism 220 are engaged, the transmission is stable and the noise is low. The herringbone meshing structure has high transmission accuracy and high injection molding accuracy, which can improve the injection molding quality.

[0028] The following embodiments illustrate the details of the planetary injection molding machine drive device of this application by way of example.

[0029] Please refer to Figures 1-5 In this embodiment, optionally, the planetary injection molding machine drive device includes a motor assembly 100 and a reducer assembly 200. The motor assembly 100 and the reducer assembly 200 are connected, and the torque of the motor assembly 100 can be adjusted by the reducer assembly 200 and then output to the injection molding machine body.

[0030] Please refer to Figures 1-2 In this embodiment, optionally, the motor assembly 100 includes a motor housing 110 and a motor body. The motor body is fixed inside the motor housing 110, and the rotation shaft 120 of the motor body extends out of the motor housing 110. The rotation shaft 120 of the motor body can be configured as a gear shaft. It should be understood that the rotation shaft 120 of the motor body can also be referred to as the output part of the motor body, and the torque of the motor body can be output through the rotation shaft 120.

[0031] Optionally, a first mounting lug (not shown) may be provided on the outer peripheral surface of the motor housing 110, and a first fixing hole may be provided on the first mounting lug. There may be multiple first mounting lugs, and the multiple first mounting lugs may be evenly spaced in the circumferential direction of the motor housing 110.

[0032] Optionally, a shoulder 121 is provided on the outer peripheral surface of the rotating shaft 120, and the shoulder 121 is located on the side of the gear portion on the rotating shaft 120 away from the motor housing 110.

[0033] Please refer to Figures 1-5 In this embodiment, optionally, the reducer assembly 200 includes a reducer housing 210, a planetary gear transmission mechanism 220, a cover 230, a vent valve 240, and a screw plug 250. The reducer housing 210 can be fixedly connected to the motor housing 110, and the planetary gear transmission mechanism 220 is installed inside the reducer housing 210. The cover 230, the vent valve 240, and the screw plug 250 are all fixedly connected to the reducer housing 210. The cover 230 can improve sealing, the vent valve 240 can discharge high-pressure gas, and the screw plug 250 can discharge oil after opening.

[0034] Optionally, the reducer housing 210 can be configured as a split structure, which facilitates manufacturing and disassembly. For example, the reducer housing 210 includes a front cover 211, a middle housing 212, and a rear cover 213. The front cover 211, the middle housing 212, and the rear cover 213 can be sequentially fixed together by bolts.

[0035] Please refer to Figures 4-5 Optionally, the outer peripheral edge of the front cover 211 protrudes beyond the outer peripheral surface of the middle housing 212. A positioning groove 2111 is provided on the outer peripheral edge of the front cover 211. The positioning groove 2111 can be a U-shaped groove, and there can be multiple positioning grooves 2111, evenly spaced apart circumferentially on the front cover 211. At least a portion of each positioning groove 2111 protrudes radially outward from the outer peripheral surface of the middle housing 212. Bolts can be embedded in the positioning groove 2111, preventing interference between the bolts and the middle housing 212. The bolts can secure the reducer housing 210 to the injection molding machine housing. Since the bolts can be inserted into the positioning groove 2111 from the outside of the front cover 211, installation is more convenient and faster than axial bolt insertion.

[0036] Optionally, the outer circumferential surface of the rear cover 213 is provided with a second mounting lug 214, and a second fixing hole 2141 can be provided on the second mounting lug 214. There can be multiple second mounting lugs 214, which can be evenly spaced along the circumference of the rear cover 213. It should be noted that the number of first and second mounting lugs 214 are equal and they correspond one-to-one. Simultaneously, the first and second fixing holes 2141 are connected, and bolts can pass through the first and second fixing holes 2141. The motor housing 110 can be fixedly connected to the rear cover 213 by bolts.

[0037] Meanwhile, the through cover 230 is fixed to the rear cover 213, approximately located in the middle of the rear cover 213. The through cover 230 can be fixedly connected to the rear cover 213 by bolts.

[0038] Please refer to Figures 1-2Optionally, the planetary gear transmission mechanism 220 includes a gear ring 221, a planet carrier 222, planet gears 223, retaining rings 224, planetary pins 225, and two support bearings 226. The gear ring 221 is located inside the middle housing 212, and the gear ring 221 can be integrated with the middle housing 212. The two ends of the planet carrier 222 are rotatably connected to the front cover 211 and the rear cover 213 respectively via two support bearings 226. A retaining ring 224 is fixed in a groove on the inner side of the planet carrier 222. The planetary pins 225 are fixed to the planet carrier 222, and the planet gears 223 are rotatably mounted on the outside of the planetary pins 225, meshing with the gear ring 221. The rotating shaft 120 of the motor body passes through the cover 230 and meshes with the planetary gears 223. Furthermore, the retaining ring 224 on the planetary carrier 222 contacts the shoulder 121 on the rotating shaft 120. The retaining ring 224 restricts the axial position of the planetary carrier 222 relative to the rotating shaft 120. After the motor body starts, the rotating shaft 120 rotates, driving the planetary gears 223 to rotate. With the cooperation of the gear ring 221, the planetary gears 223 revolve around the sun, driving the planetary carrier 222 to rotate on its own axis, thus outputting torque through the planetary carrier 222.

[0039] Optionally, an external spline 2221 can be provided at one end of the planetary carrier 222. The external spline 2221 extends out of the front cover 211 and can be connected to the actuator of the injection molding machine body for transmission.

[0040] Optionally, there can be multiple planetary gears 223, and correspondingly, there can be multiple planetary pins 225. Each planetary gear 223 is rotatably mounted on the planet carrier 222 via a planetary pin 225. The rotating shaft 120 is located in the area enclosed by multiple planetary gears 223, and the rotating shaft 120 meshes with multiple planetary gears 223 simultaneously.

[0041] Please refer to Figure 2 Optionally, the planetary pin 225 is provided with an axial oil passage 2251 and a radial oil passage 2252, with the radial oil passage 2252 connecting to the axial oil passage 2251. There can be two axial oil passages 2251, located on the two end faces of the planetary pin 225. Each axial oil passage 2251 can connect to at least one radial oil passage 2252. Lubricating oil can enter the axial oil passages 2251 and the radial oil passages 2252, and then reach the planetary gear 223 to lubricate it. It should be noted that both the vent valve 240 and the screw plug 250 can be installed on the middle housing 212, with the vent valve 240 located on the upper part of the middle housing 212 and the screw plug 250 located on the lower part of the middle housing 212.

[0042] Please refer to Figures 2-3It should be noted that the meshing teeth 227 on the rotating shaft 120, the meshing teeth 227 on the gear ring 221, and the meshing teeth 227 on the planetary gear 223 are all configured as herringbone teeth. Furthermore, the herringbone tooth includes an integral first tooth body 2271 and a second tooth body 2272, with the inner ends of the first tooth body 2271 and the second tooth body 2272 abutting each other. The extending directions of the first tooth body 2271 and the second tooth body 2272 form an angle, thus eliminating gaps between the first tooth and the second tooth body 2272. The herringbone tooth has no relief groove, resulting in high structural strength and a reduced axial dimension. It should be understood that in other embodiments, the first tooth body 2271 and the second tooth body 2272 can also be formed in a non-integral manner.

[0043] The planetary injection molding machine drive device provided in this embodiment uses a motor assembly 100 to provide power, resulting in high transmission efficiency. The meshing teeth 227 of the planetary gear transmission mechanism 220 are set as herringbone teeth, which ensures smooth transmission, low noise, high injection precision, and high injection quality.

[0044] This embodiment also provides an injection molding machine, including a planetary injection molding machine drive device, which has advantages such as high transmission efficiency, smooth transmission, and high injection precision. Obviously, the injection molding machine also includes other structural components that can achieve basic functions. To avoid repetition and redundancy, detailed descriptions are not provided in this embodiment; however, existing known structures can be referred to.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A planetary injection molding machine drive device, characterized in that, include: The motor assembly (100) and the reducer assembly (200) are provided. The reducer assembly (200) includes a reducer housing (210) and a planetary gear transmission mechanism (220). The planetary gear transmission mechanism (220) is installed inside the reducer housing (210). The reducer housing (210) is fixedly connected to the motor assembly (100). The planetary gear transmission mechanism (220) is driven by the output part of the motor assembly (100). The meshing teeth (227) of the planetary gear transmission mechanism (220) are all provided with herringbone teeth.

2. The planetary injection molding machine drive device according to claim 1, characterized in that: The herringbone tooth includes a first tooth body (2271) and a second tooth body (2272), the inner ends of the first tooth body (2271) and the inner ends of the second tooth body (2272) are connected, and the extension direction of the first tooth body (2271) and the extension direction of the second tooth body (2272) have an angle.

3. The planetary injection molding machine drive device according to claim 2, characterized in that: The first tooth body (2271) and the second tooth body (2272) of the same herringbone tooth are configured as an integral structure.

4. The planetary injection molding machine drive device according to any one of claims 1-3, characterized in that: The motor assembly (100) includes a motor housing (110) and a motor body. The motor housing (110) is fixedly connected to the reducer housing (210). The motor body is fixedly connected to the motor housing (110). The rotating shaft (120) of the motor body is configured as a gear shaft. The rotating shaft (120) extends into the reducer housing (210) and meshes with the planetary gear transmission mechanism (220).

5. The planetary injection molding machine drive device according to any one of claims 1-3, characterized in that: The planetary gear transmission mechanism (220) includes a gear ring (221), a planet carrier (222), and planet gears (223). The gear ring (221) is fixedly connected to the reducer housing (210), the planet carrier (222) is rotatably connected to the reducer housing (210), and the planet gears (223) are rotatably mounted on the planet carrier (222). The planet gears (223) mesh with the gear ring (221). The output of the motor assembly (100) meshes with the planetary gear (223).

6. The planetary injection molding machine drive device according to claim 5, characterized in that: The speed reducer assembly (200) also includes a cover (230), which is fixedly connected to the speed reducer housing (210), and the output part is inserted inside the cover (230).

7. The planetary injection molding machine drive device according to claim 5, characterized in that: The planetary gear transmission mechanism (220) further includes a retaining ring (224) which is engaged with the planet carrier (222); the output part is provided with a shoulder (121), and the retaining ring (224) contacts the shoulder (121) to limit the position of the planet carrier (222) relative to the output part in the axial direction of the output part.

8. The planetary injection molding machine drive device according to claim 5, characterized in that: The planetary gear transmission mechanism (220) further includes a planetary pin (225), which is provided with an axial oil passage (2251) and a radial oil passage (2252), and the radial oil passage (2252) communicates with the axial oil passage (2251); the planetary pin (225) is fixed on the planet carrier (222), and the planetary gear (223) is rotatably connected to the planetary pin (225).

9. The planetary injection molding machine drive device according to any one of claims 1-3, characterized in that: The reducer housing (210) includes a front cover (211), a middle housing (212), and a rear cover (213) connected in sequence. The edge of the front cover (211) is provided with a positioning groove (2111). At least a portion of the positioning groove (2111) protrudes outward from the outer peripheral surface of the middle housing (212) along the radial direction of the front cover (211). The positioning groove (2111) is used to embed bolts that can connect the front cover (211) to the injection molding machine housing.

10. An injection molding machine, characterized in that, The injection molding machine includes: The planetary injection molding machine drive device according to any one of claims 1-9.

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