An injection molding apparatus for the production of graphite bearings

Abstract

This invention discloses an injection molding apparatus for graphite bearing production, relating to the field of bearing manufacturing. It includes a molding machine and a worktable mounted above the molding machine. A four-station rotary table is rotatably mounted on the top of the worktable via a bearing disc. Injection molding dies for injection molding are installed above the four-station rotary table at positions corresponding to the four stations. A positioning load assembly is located inside the molding machine below the four-station rotary table. This invention enables continuous injection molding of graphite bearing blanks. By installing the positioning load assembly at the bottom of the four-station rotary table and designing its structure, it not only achieves precise positioning and locking of the four-station rotary table, ensuring accurate stopping of the injection molding dies at the stations, but also disperses the pressure of the four-station rotary table during injection molding of the graphite bearing, improving the service life of the entire device and the overall stability during injection molding.

Description

Technical Field

[0001] This invention relates to the field of bearing manufacturing, and more particularly to an injection molding apparatus for the production of graphite bearings. Background Technology

[0002] In the existing production technology of graphite bearings, injection molding is one of the key processes for preparing the blank. Currently, the injection molding equipment commonly used in the industry mostly adopts a single-station or linear multi-station layout. However, during production, the processes of loading, injection, holding pressure, and demolding must be completed sequentially at the same station, resulting in low equipment utilization, slow production cycle, and difficulty in meeting the demands of large-scale production. Although subsequent linear multi-station devices have improved production efficiency to some extent by setting up multiple independent workstations, the transfer between stations requires complex robotic arms or conveying systems, which not only increases equipment costs and floor space but also easily generates dust pollution during graphite powder conveying, affecting the working environment. While existing rotary multi-station devices have achieved parallel processing of processes to some extent, their rotary positioning accuracy is often difficult to guarantee, especially during high-pressure injection. Small displacements of the mold can lead to product dimensional deviations, affecting the molding quality of graphite bearings. This is mainly because traditional rotary positioning mechanisms undergo elastic deformation under injection pressure and lack an effective pressure dispersion mechanism. In addition, existing devices perform poorly under continuous high-pressure conditions. When the injection system applies high pressure, all the force is directly transmitted to the rotary table support structure, which can easily lead to mechanical failures such as spindle deformation and bearing wear over long-term use. This structural defect not only affects the service life of the equipment, but also causes slight vibrations in the mold during the molding process, resulting in uneven density distribution of the graphite blank, which directly affects the mechanical properties and wear resistance of the final product. Summary of the Invention

[0003] (a) Purpose of the invention In view of this, the purpose of this invention is to provide an injection molding device for the production of graphite bearings. This device can realize continuous injection molding of graphite bearing blanks. By installing a positioning load component at the bottom of a four-station rotary table and designing the structure of the positioning load component, it can not only achieve positioning and locking of the four-station rotary table, ensuring that the injection molding mold on the four-station rotary table stops precisely at the station position, but also disperse the pressure of the four-station rotary table during injection molding of the graphite bearing, thereby improving the service life of the entire device and the overall stability during injection molding.

[0004] (II) Technical Solution To achieve the above-mentioned technical objectives, the present invention provides an injection molding apparatus for the production of graphite bearings, which is used for continuous injection molding of graphite bearing blanks. It includes a molding machine and a worktable mounted above the molding machine. A four-station rotary table is rotatably mounted on the top of the worktable via a bearing plate. Injection molding dies for injection molding are mounted above the four-station rotary table at positions corresponding to the four stations. A positioning load assembly is disposed inside the molding machine below the four-station rotary table. The positioning load assembly is used to position the four-station rotary table when it rotates to a station position. Positioning is performed, and the pressure of the four-station rotary table is distributed during the injection molding of the graphite bearing blank. The bottom edge of the four-station rotary table is provided with a positioning load socket corresponding to the position of the positioning load component. The positioning load component includes a second mounting bracket and a positioning load plate movably mounted on the second mounting bracket. The positioning load plate can move to a first position and a second position under external constraints. The first position is the locked position in which one end of the positioning load plate is inserted into the positioning load socket, and the second position is the unlocked position in which one end of the positioning load plate is removed from the positioning load socket.

[0005] As a further description of the above technical solution: the positioning load component includes multiple sets of second mounting brackets and positioning load plates, wherein the multiple sets of second mounting brackets and positioning load plates are distributed in a ring array around the periphery of the four-station rotary table. The multiple sets of second mounting brackets and positioning load plates can simultaneously position and support the four-station rotary table from multiple angles, thereby improving the load effect of the positioning load component on the four-station rotary table.

[0006] As a further description of the above technical solution: a slide chamber is provided on the upper surface of the second mounting bracket along the radial direction of the four-position rotary table, and a lower clamping plate is provided below the end of the positioning load clamping plate away from the four-position rotary table. The lower clamping plate is slidably engaged in the slide chamber, and a pull-back reset spring is provided between one end of the lower clamping plate and one end of the inner wall of the slide chamber, so that the positioning load clamping plate can move radially along the four-position rotary table.

[0007] As a further description of the above technical solution: the positioning load assembly also includes a drive rotating ring, which is rotatably installed inside the molding machine and coaxially surrounds the outside of the four-station rotary table. The upper surface of each set of positioning load plates is provided with an arc-shaped wedge-shaped through groove. The inner side of the drive rotating ring is equipped with an irregularly shaped top plate corresponding to the number of positioning load plates. The drive rotating ring passes through the arc-shaped wedge-shaped through grooves on each set of positioning load plates. When the drive rotating ring rotates, the irregularly shaped top plate can rotate to the third position and the fourth position. In the third position, the irregularly shaped top plate is inserted into the arc-shaped wedge-shaped through groove, causing the irregularly shaped top plate to press against the positioning load plate, and the positioning load plate moves to the first position. In the fourth position, the irregularly shaped top plate moves out of the arc-shaped wedge-shaped through groove, causing the irregularly shaped top plate to separate from the positioning load plate. Under the elastic force of the return spring, the positioning load plate moves back to the second position.

[0008] As a further description of the above technical solution: the positioning load assembly also includes a third mounting bracket. A second motor is fixedly installed inside the molding machine through the third mounting bracket. A second gear is installed on the output shaft of the second motor. A residual tooth ring is installed on the outer edge of the drive ring at the position corresponding to the second gear. The residual tooth ring meshes with the second gear. When the second motor runs, it drives the second gear to rotate. Since the second gear meshes with the second gear, it drives the drive ring to rotate, thereby realizing synchronous movement control of all positioning load plates.

[0009] As a further description of the above technical solution: the side of the arc-shaped wedge groove that contacts the irregular top plate adopts an arc-shaped structure, so that when the drive ring rotates, one end of the irregular top plate can gradually be inserted into the arc-shaped wedge groove, thereby achieving stable control of the positioning load plate.

[0010] As a further description of the above technical solution: the molding machine is provided with a support plate inside, and a first mounting frame is fixedly installed on the top of the support plate. A first motor is installed below one end of the first mounting frame, and a first gear is installed on the output shaft of the first motor. The bottom of the four-station rotary table is provided with a variable cross-section stepped groove along the circumference, and a gear ring is sleeved at the position of the variable cross-section stepped groove. The gear ring is meshed with the first gear. When the first motor runs, it drives the first gear to rotate. Since the gear ring is meshed with the first gear, it drives the four-station rotary table to rotate, thereby realizing continuous injection molding.

[0011] As a further description of the above technical solution: an upper plate is installed parallel above the four-station rotary table, and the injection molding mold includes a lower mold and an upper mold. The lower mold is fixed on the upper surface of the four-station rotary table, and a hydraulic cylinder is installed on the top of the upper plate. The piston rod of the hydraulic cylinder passes through the upper plate and is connected to the upper mold. When the hydraulic cylinder runs, it can drive the upper mold to move in the vertical direction to realize mold closing and mold opening.

[0012] As a further description of the above technical solution: two hydraulic cylinders are installed above each injection molding die. The two hydraulic cylinders are symmetrical about the vertical center line of the injection molding die. Guide sleeves are embedded in the four corners of the upper die. A guide rod is installed at the bottom of the upper plate at the same straight line position as the guide sleeve and slides into the guide sleeve. The upper die can be subjected to uniform force when closing the die and can be stable and smooth when lifting and lowering, and the alignment with the lower die is accurate.

[0013] As a further description of the above technical solution: the four-station rotary table and the upper plate are both provided with a central hole in the middle. A functional extension frame is installed on the top of the support plate. The functional extension frame passes through the central hole in the middle of the four-station rotary table and the upper plate. Some extended functional equipment, such as mold release auxiliary device, blank clamping device, mold cleaning auxiliary device, etc., can be installed on the functional extension frame according to the actual injection molding requirements.

[0014] In the above technical solution, the present invention provides an injection molding device for the production of graphite bearings. This device adopts four-station injection molding, that is, by designing a four-station rotary table and cooperating with multiple sets of injection molding dies, it can realize continuous injection molding of graphite bearing blanks. Furthermore, by installing a positioning load assembly at the bottom of the four-station rotary table, and through the structural design of the positioning load assembly, the positioning load plate in the positioning load assembly is in the unlocked position of the second position when the four-station rotary table rotates, without affecting the rotation of the four-station rotary table. When the four-station rotary table rotates to each station, the positioning load plate in the positioning load assembly located below the four-station rotary table moves to the first position, that is, one end of the positioning load plate is inserted into the locking position in the positioning load socket. In this way, on the one hand, the positioning and locking of the four-station rotary table is achieved, so that the injection molding die on the four-station rotary table stops at the station position accurately. On the other hand, it can also disperse the pressure of the four-station rotary table during the injection molding of graphite bearings, thereby improving the service life of the entire device and the overall stability during injection molding. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort: Figure 1 A schematic diagram of the overall structure of an injection molding device for the production of graphite bearings provided by the present invention; Figure 2 This invention provides a schematic diagram of the installation structure of an injection molding die in an injection molding device for the production of graphite bearings. Figure 3 A schematic diagram of the bottom structure of a four-station rotary table in an injection molding device for the production of graphite bearings provided by the present invention. Figure 4 This invention provides a schematic diagram of the installation structure of the positioning load component in an injection molding device for the production of graphite bearings. Figure 5 A schematic diagram of the installation of a four-station rotary table control structure in an injection molding device for graphite bearing production, provided by the present invention. Figure 6 This invention provides a schematic diagram of the drive rotating ring mounting structure in an injection molding device for the production of graphite bearings. Figure 7 A schematic diagram of the structure of a pressure molding device for producing graphite bearings provided by the present invention, showing the positioning load plate in the first position; Figure 8 A schematic diagram of the structure of a pressure molding device for producing graphite bearings provided by the present invention, showing the positioning load plate in the second position; Figure 9 This invention provides a schematic diagram of the positioning load plate mounting structure in an injection molding device for the production of graphite bearings.

[0016] Figure Descriptions: 1. Molding machine; 2. Worktable; 3. Four-station rotary table; 30. Positioning load socket; 31. Central hole; 32. Variable cross-section stepped groove; 33. Gear ring; 4. Upper plate; 40. Through hole; 41. Hydraulic cylinder; 5. Functional extension frame; 6. Injection molding die; 60. Lower die; 61. Upper die; 610. Guide sleeve; 62. Guide rod; 7. Support plate; 70. First gear; 71. First mounting frame; 72. First motor; 8. Positioning load assembly; 80. Second mounting frame; 800. Slide chamber; 81. Drive ring; 810. Residual tooth ring; 811. Irregular top plate; 82. Third mounting frame; 820. Second motor; 821. Second gear; 83. Positioning load clamping plate; 830. Arc-shaped wedge groove; 831. Retraction return spring; 832. Lower clamping plate. Detailed Implementation

[0017] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0018] like Figure 1-9 As shown: This embodiment provides a technical solution: an injection molding device for the production of graphite bearings, which is used for continuous injection molding of graphite bearing blanks. It includes a molding machine 1 and a worktable 2 installed above the molding machine 1. A four-station rotary table 3 is rotatably installed on the top of the worktable 2 via a bearing plate. An injection molding die 6 for injection molding is installed above the four-station rotary table 3 at the positions corresponding to the four stations. Inside the molding machine 1, below the four-station rotary table 3, there is a positioning load component 8. The positioning load component 8 is used to position the four-station rotary table 3 when it rotates to the station position, and to disperse the pressure of the four-station rotary table 3 during the injection molding of the graphite bearing blank. The bottom edge of the four-station rotary table 3 is provided with a positioning load socket 30 corresponding to the position of the positioning load component 8. The positioning load component 8 includes a second mounting bracket 80 and a positioning load plate 83 movably mounted on the second mounting bracket 80. The positioning load plate 83 can move to a first position and a second position under external constraints. The first position is the locking position in which one end of the positioning load plate 83 is inserted into the positioning load socket 30, and the second position is the unlocking position in which one end of the positioning load plate 83 is removed from the positioning load socket 30. Working Principle: This device employs a four-station injection molding process, consisting of a preparation station, an injection station, a cooling station, and a demolding station. Four sets of injection molding dies 6 are installed on the four-station rotary table 3, enabling continuous injection molding of graphite bearing blanks. During operation, the device first prepares for injection at the preparation station, then moves to the injection station. After injection molding, it moves to the cooling station, where it cools and solidifies before moving to the demolding station. Finally, after demolding at the demolding station, it moves back to the preparation station to await the start of the next injection cycle. While the four-station rotary table 3 rotates, the positioning load plate 83 in the positioning load assembly 8 is positioned... The second unlocking position does not affect the rotation of the four-station rotary table 3. When the four-station rotary table 3 rotates to each station, the positioning load plate 83 in the positioning load assembly 8 located below the four-station rotary table 3 moves to the first position, that is, one end of the positioning load plate 83 is inserted into the locking position in the positioning load socket 30. On the one hand, this realizes the positioning and locking of the four-station rotary table 3, so that the injection molding mold 6 on the four-station rotary table 3 stops at the station position accurately. On the other hand, it can make the graphite bearing disperse the pressure of the four-station rotary table 3 during injection molding, thereby improving the service life of the entire device and the overall stability during injection molding.

[0019] Specifically, such as Figure 5 - Figure 9 As shown, in order to improve the load effect of the positioning load component 8 on the four-station rotary table 3, in this embodiment, the positioning load component 8 includes multiple sets of second mounting brackets 80 and positioning load plates 83. The multiple sets of second mounting brackets 80 and positioning load plates 83 are arranged in a ring array around the periphery of the four-station rotary table 3. Based on this, the multiple sets of second mounting brackets 80 and positioning load plates 83 can simultaneously position and support the four-station rotary table 3 from multiple angles, thereby improving the load effect of the positioning load component 8 on the four-station rotary table 3.

[0020] like Figure 5 - Figure 9 As shown, in order to realize the movable installation of the positioning load plate 83, in this embodiment, a slide 800 is provided on the upper surface of the second mounting bracket 80 along the radial direction of the four-position rotary table 3. A lower plate 832 is provided below the end of the positioning load plate 83 away from the four-position rotary table 3. The lower plate 832 is slidably engaged in the slide 800, and a pull-back spring 831 is provided between one end of the lower plate 832 and one end of the inner wall of the slide 800, so that the positioning load plate 83 can move radially along the four-position rotary table 3. It should be noted that the pull-back spring 831 can pull the positioning load plate 83 to move in its natural state, so that one end of it exits the positioning load socket 30, and the positioning load plate 83 can be kept in the unlocked position of the second position.

[0021] Specifically, such as Figure 5 - Figure 9 As shown, in order for multiple sets of positioning load plates 83 to move synchronously to the first position or the second position, in this embodiment, the positioning load assembly 8 further includes a drive ring 81. The drive ring 81 is rotatably installed inside the molding machine 1 and coaxially surrounds the outside of the four-station rotary table 3. The upper surface of each set of positioning load plates 83 is provided with an arc-shaped wedge-shaped through groove 830. The inner side of the drive ring 81 is equipped with an irregularly shaped top plate 811 corresponding to the number of positioning load plates 83. The drive ring 81 passes through the arc-shaped wedge-shaped through groove 830 on each set of positioning load plates 83. 30, and when the drive ring 81 rotates, the irregular top plate 811 can rotate to the third position and the fourth position. In the third position, the irregular top plate 811 is inserted into the arc-shaped wedge groove 830, so that the irregular top plate 811 presses the positioning load plate 83, and the positioning load plate 83 moves to the first position. In the fourth position, the irregular top plate 811 moves out of the arc-shaped wedge groove 830, so that the irregular top plate 811 separates from the positioning load plate 83, and the positioning load plate 83 moves back to the second position under the elastic force of the return spring 831.

[0022] Specifically, such as Figure 5 - Figure 9 As shown, in order to control the drive ring 81, in this embodiment, the positioning load assembly 8 also includes a third mounting bracket 82. The second motor 820 is fixedly mounted inside the molding machine 1 through the third mounting bracket 82. A second gear 821 is mounted on the output shaft of the second motor 820. A residual tooth ring 810 is mounted on the outer edge of the drive ring 81 at the position corresponding to the second gear 821. The residual tooth ring 810 meshes with the second gear 821. Based on this, when the second motor 820 runs, it drives the second gear 821 to rotate. Since the second gear 821 meshes with the second gear 821, it drives the drive ring 81 to rotate, thereby realizing the synchronous movement control of all positioning load plates 83.

[0023] Specifically, such as Figure 5 - Figure 9 As shown, in order to make the compression control of the irregular top plate 811 on the positioning load plate 83 smooth and stable, in this embodiment, the side of the arc-shaped wedge groove 830 that contacts the irregular top plate 811 adopts an arc-shaped structure, so that when the drive ring 81 rotates, one end of the irregular top plate 811 can gradually be inserted into the arc-shaped wedge groove 830, thereby achieving stable control of the positioning load plate 83.

[0024] Specifically, such as Figure 1 - Figure 6As shown, in order to achieve rotation control of the four-station rotary table 3 and enable the device to continuously inject and press mold, in this embodiment, the molding machine 1 is provided with a support plate 7 inside, a first mounting bracket 71 is fixedly installed on the top of the support plate 7, a first motor 72 is installed below one end of the first mounting bracket 71, a first gear 70 is installed on the output shaft of the first motor 72, a variable cross-section stepped groove 32 is provided on the bottom of the four-station rotary table 3 along the circumferential direction, and a gear ring 33 is sleeved at the position of the variable cross-section stepped groove 32. The gear ring 33 is meshed with the first gear 70. Based on this, when the first motor 72 runs, it drives the first gear 70 to rotate. Since the gear ring 33 is meshed with the first gear 70, it drives the four-station rotary table 3 to rotate, thereby realizing continuous injection molding.

[0025] Specifically, such as Figure 1 - Figure 4 As shown, in order to achieve mold closing and mold opening, in this embodiment, an upper plate 4 is installed parallel above the four-station rotary table 3. The injection molding mold 6 includes a lower mold 60 and an upper mold 61. The lower mold 60 is fixed on the upper surface of the four-station rotary table 3. A hydraulic cylinder 41 is installed on the top of the upper plate 4. The piston rod of the hydraulic cylinder 41 passes through the upper plate 4 and is connected to the upper mold 61. Based on this, when the hydraulic cylinder 41 is running, it can drive the upper mold 61 to move in the vertical direction to achieve mold closing and mold opening. It should also be noted that a through hole 40 is provided on the upper plate 4 at the center of the upper mold 61. The through hole 40 is used for the material injection device to be inserted during injection.

[0026] Specifically, such as Figure 1 - Figure 4 As shown, in order to ensure that the upper mold 61 is subjected to uniform force and that the lifting and lowering are stable, in this embodiment, two hydraulic cylinders 41 are installed above each injection molding mold 6. The two hydraulic cylinders 41 are symmetrical about the vertical center line of the injection molding mold 6. Guide sleeves 610 are embedded in the four corner positions of the upper mold 61. Guide rods 62 are installed at the bottom of the upper plate 4 at the same straight position as the guide sleeves 610 and are slidably inserted into the guide sleeves 610. Based on this, the upper mold 61 can be subjected to uniform force when the mold is closed, and can be stable and smooth when lifting and lowering, and the alignment with the lower mold 60 is accurate.

[0027] Specifically, such as Figure 1 - Figure 4As shown, in order to increase the versatility of the equipment, in this embodiment, the four-station rotary table 3 and the upper plate 4 are both provided with central holes 31. The top of the support plate 7 is equipped with a functional extension frame 5, which passes through the central holes 31 in the four-station rotary table 3 and the upper plate 4. Based on this, some extended functional equipment, such as mold release auxiliary devices, blank clamping devices, mold cleaning auxiliary devices, etc., can be installed on the functional extension frame 5 according to the actual injection molding requirements. It should be noted that since the rotation of the functional extension frame 5 does not affect the rotation of the four-station rotary table 3 and the upper plate 4, the corresponding extension devices can be installed on the functional extension frame 5 according to the actual needs of each station, thereby increasing the compatibility of the equipment.

[0028] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A compression molding apparatus for the production of graphite bearings, used for continuous compression molding of graphite bearing blanks, comprising a molding machine (1) and a worktable (2) mounted above the molding machine (1), characterized in that, The top of the workbench (2) is rotatably mounted with a four-position rotary table (3) via a bearing plate. Above the four-position rotary table (3), injection molding molds (6) for injection molding are installed at the positions corresponding to the four positions. The molding machine (1) is provided with a positioning load assembly (8) located below the four-station rotary table (3). The positioning load assembly (8) is used to position the four-station rotary table (3) when it rotates to the station position, and to disperse the pressure of the four-station rotary table (3) during the injection molding of the graphite bearing blank. The bottom edge of the four-station rotary table (3) is provided with a positioning load socket (30) corresponding to the position of the positioning load assembly (8). The positioning load assembly (8) includes a second mounting bracket (80) and a positioning load plate (83) movably mounted on the second mounting bracket (80). The positioning load plate (83) can move to a first position and a second position under external constraints. The first position is the locking position where one end of the positioning load plate (83) is inserted into the positioning load socket (30), and the second position is the unlocking position where one end of the positioning load plate (83) is removed from the positioning load socket (30).

2. The injection molding apparatus for producing graphite bearings according to claim 1, characterized in that, The positioning load assembly (8) includes multiple sets of second mounting brackets (80) and positioning load plates (83). The multiple sets of second mounting brackets (80) and positioning load plates (83) are arranged in a ring array around the periphery of the four-station rotary table (3). The multiple sets of second mounting brackets (80) and positioning load plates (83) can simultaneously position and support the four-station rotary table (3) from multiple angles.

3. The injection molding apparatus for producing graphite bearings according to claim 2, characterized in that, The upper surface of the second mounting bracket (80) is provided with a slide (800) along the radial direction of the four-position rotary table (3). A lower plate (832) is provided below the end of the positioning load plate (83) away from the four-position rotary table (3). The lower plate (832) is slidably engaged in the slide (800). A pull-back spring (831) is provided between one end of the lower plate (832) and one end of the inner wall of the slide (800), so that the positioning load plate (83) can move radially along the four-position rotary table (3).

4. The injection molding apparatus for producing graphite bearings according to claim 3, characterized in that, The positioning load assembly (8) also includes a drive ring (81), which is rotatably installed inside the molding machine (1) and coaxially surrounds the outside of the four-station rotary table (3). Each set of positioning load plates (83) has an arc-shaped wedge-shaped through-slot (830) on its upper surface. The inner side of the drive ring (81) is fitted with a shaped top plate (811) corresponding to the number of positioning load plates (83). The drive ring (81) passes through the arc-shaped wedge-shaped through-slot (830) on each set of positioning load plates (83). When the drive ring (81) rotates, the… The irregular top plate (811) can rotate to a third position and a fourth position. In the third position, the irregular top plate (811) is inserted into the arc-shaped wedge groove (830), causing the irregular top plate (811) to press against the positioning load plate (83), and the positioning load plate (83) moves to the first position. In the fourth position, the irregular top plate (811) moves out of the arc-shaped wedge groove (830), causing the irregular top plate (811) to separate from the positioning load plate (83), and the positioning load plate (83) moves back to the second position under the elastic force of the pull-back reset spring (831).

5. The injection molding apparatus for producing graphite bearings according to claim 4, characterized in that, The positioning load assembly (8) also includes a third mounting bracket (82). A second motor (820) is fixedly mounted inside the molding machine (1) via the third mounting bracket (82). A second gear (821) is mounted on the output shaft of the second motor (820). A residual tooth ring (810) is mounted on the outer edge of the drive ring (81) at the position corresponding to the second gear (821). The residual tooth ring (810) meshes with the second gear (821).

6. The injection molding apparatus for producing graphite bearings according to claim 5, characterized in that, The side of the arc-shaped wedge groove (830) that contacts the irregular top plate (811) adopts an arc-shaped structure, so that when the drive ring (81) rotates, one end of the irregular top plate (811) can gradually be inserted into the arc-shaped wedge groove (830).

7. The injection molding apparatus for producing graphite bearings according to claim 1, characterized in that, The molding machine (1) is provided with a support plate (7) inside. A first mounting bracket (71) is fixedly installed on the top of the support plate (7). A first motor (72) is installed below one end of the first mounting bracket (71). A first gear (70) is installed on the output shaft of the first motor (72). A variable cross-section stepped groove (32) is provided on the bottom of the four-station rotary table (3) along the circumferential direction. A toothed ring (33) is sleeved at the position of the variable cross-section stepped groove (32). The toothed ring (33) meshes with the first gear (70).

8. The injection molding apparatus for producing graphite bearings according to claim 7, characterized in that, An upper plate (4) is installed parallel above the four-station rotary table (3). The injection molding mold (6) includes a lower mold (60) and an upper mold (61). The lower mold (60) is fixed on the upper surface of the four-station rotary table (3). A hydraulic cylinder (41) is installed on the top of the upper plate (4). The piston rod of the hydraulic cylinder (41) passes through the upper plate (4) and is connected to the upper mold (61).

9. The injection molding apparatus for producing graphite bearings according to claim 8, characterized in that, Two hydraulic cylinders (41) are installed above each injection molding die (6). The two hydraulic cylinders (41) are symmetrical about the vertical center line of the injection molding die (6). Guide sleeves (610) are embedded in the four corners of the upper die (61). A guide rod (62) is installed at the bottom of the upper plate (4) at the same straight position as the guide sleeve (610) and slides into the guide sleeve (610).

10. The injection molding apparatus for producing graphite bearings according to claim 9, characterized in that, The four-station rotary table (3) and the upper plate (4) are provided with a central hole (31) in the middle. The top of the support plate (7) is equipped with a functional extension frame (5), which passes through the central hole (31) in the middle of the four-station rotary table (3) and the upper plate (4).

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