A rotary pair hinge mechanism for a parallel machine tool and an assembling method thereof

Abstract

The present application relates to parallel machine tool technical field, specifically to a kind of rotary pair hinge mechanism for parallel machine tool and its assembly method, including slide, connecting rod and rotary pair, slide is connected with connecting rod by rotary pair, connecting rod is installed on slide by rotary pair and does angular motion around the axis of rotary pair;Rotary pair includes rotating shaft, adjusting pad and rotary table bearing, both ends of rotating shaft are inserted into the matching hole of the opposite sides of slide respectively and the outer circle of rotating shaft is interference fit with matching hole;Adjusting pad and rotary table bearing are both set in rotating shaft and fixed on slide, adjusting pad is used to adjust the installation distance between the rotary table bearing of two sides, the inner ring of rotary table bearing is transition fit with the outer circle of rotating shaft, the outer ring of rotary table bearing is installed in the bearing hole of connecting rod and transition fit.The rotary pair hinge mechanism for parallel machine tool and its assembly method aim to solve the problems of weak cutting stiffness and low machining precision of parallel machine tool.

Description

Technical Field

[0001] This invention relates to the field of parallel machine tool technology, and more specifically to a rotary joint hinge mechanism for parallel machine tools and its assembly method. Background Technology

[0002] Parallel machine tools, also known as virtual axis machine tools, are a new type of machine tool structure that emerged at the end of the last century. They are hailed as a major revolution in machine tool structure and a new generation of CNC machining equipment for the 21st century. Based on spatial parallel mechanisms, they overcome the inherent defects of traditional serial machine tool structures. Within the same size range, they have advantages such as high modularity, high stiffness-to-weight ratio, light moving parts, fast response speed, strong versatility, and high added value. They can realize multi-axis CNC linkage machining and have attracted widespread attention from relevant research institutions and machine tool manufacturers at home and abroad.

[0003] The main body of a parallel machine tool is based on a spatial parallel mechanism design. It generally consists of a static platform, a moving platform (including the cutting spindle), and several motion chains. Each motion chain is kinematically completely parallel. Each motion chain contains at most one driver and is usually composed of a prismatic joint P (with one degree of freedom for linear movement), a revolute joint R (with one degree of freedom for rotation about the axis), and a spherical joint S (with three degrees of freedom for rotation about the axis) arranged in a certain structural sequence.

[0004] In the mechanical structure of parallel machine tools, revolute hinges and spherical hinges are weak links affecting the static and dynamic rigidity and machining accuracy of the entire machine. Currently, there are two common structural forms for revolute hinges: one uses paired angular contact ball bearings or tapered roller bearings, arranged face-to-face (or back-to-back) to eliminate the clearance between the inner and outer rings of the bearings and the rolling elements, achieving bearing preload and obtaining high rotational accuracy. However, this results in insufficient load-bearing rigidity and cannot fully meet the cutting requirements of parallel machine tools. The other form uses a combination of needle roller bearings and end-face thrust bearings. Due to the internal clearance of needle roller bearings, radial preload cannot be achieved, resulting in low rotational accuracy and easy cutting vibration during machining. Therefore, the performance of revolute hinges using this structural form is also not ideal.

[0005] Therefore, the inventors provide a rotary joint hinge mechanism for parallel machine tools and its assembly method. Summary of the Invention

[0006] (1) Technical problems to be solved

[0007] This invention provides a rotary joint hinge mechanism for parallel machine tools and its assembly method, which solves the technical problems of weak cutting rigidity and low machining accuracy in parallel machine tools.

[0008] (2) Technical solution

[0009] A first aspect of the present invention provides a revolute hinge mechanism for a parallel machine tool, comprising a slide plate, a connecting rod, and a revolute joint. The slide plate is connected to the connecting rod via the revolute joint. The slide plate is mounted on a linear guide and moves linearly under the drive of a servo motor and a ball screw pair. The connecting rod is mounted on the slide plate via the revolute joint and moves at an angular angle about the axis of the revolute joint. The revolute joint includes a rotating shaft, an adjusting shim, and a rotary table bearing. The two ends of the rotating shaft are respectively inserted into mating holes on opposite sides of the slide plate, and the outer circle of the rotating shaft is interference-fitted with the mating holes. The adjusting shim and the rotary table bearing are both sleeved on the rotating shaft and fixed on the slide plate. The adjusting shim is used to adjust the installation distance between the rotary table bearings on both sides of the control plate. The inner ring of the rotary table bearing is transition-fitted with the outer circle of the rotating shaft, and the outer ring of the rotary table bearing is installed in the bearing hole of the connecting rod and transition-fitted.

[0010] Furthermore, the rotating pair also includes a sealing end cap and a first sealing ring. The sealing end cap is located on the outside of the turntable bearing and is installed on the outer end face of the bearing hole of the connecting rod. A sealing groove is provided on the outer circle of the stop of the sealing end cap. The first sealing ring is installed in the sealing groove and is used to seal the turntable bearing.

[0011] Furthermore, the rotating pair also includes a second sealing ring, and both ends of the slide plate are provided with end face sealing grooves. The second sealing ring is disposed in the end face sealing groove and is sealed and fitted to the end face of the connecting rod.

[0012] Furthermore, the lower end face of the slide plate is provided with a first mounting surface for connecting with the linear guide rail, and the end face of the slide plate away from the connecting rod is provided with a second mounting surface for connecting with the ball screw pair.

[0013] Furthermore, one end of the connecting rod is provided with a mounting interface for installing a spherical secondary hinge.

[0014] Furthermore, the other end of the connecting rod is provided with a first earring and a second earring, the first earring having a first bearing hole along its axial direction, and the second earring having a second bearing hole along its axial direction, and the two ends of the two turntable bearings are respectively installed in the corresponding first bearing hole and second bearing hole.

[0015] Furthermore, the rotating pair also includes lubricating oil cups, with two lubricating oil cups respectively installed on the lubricating oil holes on the corresponding first and second lubricating rings, and the lubricating oil holes communicating with the lubricating oil groove on the outer ring of the turntable bearing.

[0016] Furthermore, the middle part of the connecting rod has a concave shape.

[0017] Furthermore, the sealing end cap has a stop end face for pressing the outer ring of the turntable bearing, and the stop end face has multiple slots along its circumferential direction.

[0018] A second aspect of the present invention provides an assembly method for a revolute hinge mechanism for a parallel machine tool, comprising the following steps:

[0019] Measure the first distance between the inner end faces of the bearing holes on both sides of the connecting rod;

[0020] Measure the second distance between the bearing mounting end faces on both sides of the slide plate;

[0021] Measure the third and fourth distances between the inner and outer ring mounting faces of the bearings on both sides of the turntable, respectively.

[0022] The thickness of the adjustment pad is determined based on the first distance, the second distance, the third distance, and the fourth distance;

[0023] The second sealing ring is installed in the sealing groove on the end face of the slide plate;

[0024] Screw the lubricating oil cup into the lubricating oil hole of the connecting rod;

[0025] Align the first bearing hole and the second bearing hole on the connecting rod with the corresponding mating holes on the slide plate, and insert the two ends of the rotating shaft through the first bearing hole and the second bearing hole respectively into the corresponding mating holes;

[0026] Install the adjusting pads at both ends of the rotating shaft and the turntable bearings;

[0027] Measure the fifth distance between the outer end face of the bearing hole of the connecting rod and the outer ring of the turntable bearing;

[0028] Calculate the stop length of the sealing end cap based on the fifth distance, and grind the stop end face;

[0029] Install the first sealing ring into the sealing groove of the sealing end cap;

[0030] Install the sealing end cap on the connecting rod so that the stop end face presses against the outer ring of the turntable bearing.

[0031] (3) Beneficial effects

[0032] In summary, this invention, by employing two rotary table bearings for support, features high rotational accuracy and strong load-bearing capacity. After the rotary table bearings are installed and fixed, axial and radial preload can be achieved, with no running clearance, making it ideal for use in parallel machine tools where the hinge speed of the rotating pair is low and the load is high. Furthermore, an adjusting shim is provided between the inner ring of the rotary table bearing and the slide plate. By grinding the adjusting shim, the installation distance between the two rotary table bearings can be precisely adjusted, preventing additional axial force between the bearings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a structural front view of a rotary joint hinge mechanism for parallel machine tools provided in an embodiment of the present invention;

[0035] Figure 2 This is a top view of a rotating joint hinge mechanism for parallel machine tools provided in an embodiment of the present invention;

[0036] Figure 3 yes Figure 1 Structural cross-sectional view of the AA surface;

[0037] Figure 4 This is a schematic diagram illustrating the installation and application of a rotary joint hinge mechanism for parallel machine tools provided in an embodiment of the present invention.

[0038] Figure 5 This is a structural axis view of a sliding plate for a rotary joint hinge mechanism in a parallel machine tool, provided in an embodiment of the present invention.

[0039] Figure 6 This is a front view of the slide plate of a rotary joint hinge mechanism for a parallel machine tool provided in an embodiment of the present invention;

[0040] Figure 7 yes Figure 6 Structural cross-sectional view of the middle BB surface;

[0041] Figure 8 This is a structural axial view of the connecting rod of a rotary joint hinge mechanism for a parallel machine tool provided in an embodiment of the present invention;

[0042] Figure 9 This is a front view of the connecting rod structure of a rotary joint hinge mechanism for a parallel machine tool provided in an embodiment of the present invention;

[0043] Figure 10This is a top view of the connecting rod of a rotary joint hinge mechanism for a parallel machine tool provided in an embodiment of the present invention;

[0044] Figure 11 yes Figure 9 Structural cross-sectional view of the C-plane;

[0045] Figure 12 This is a schematic diagram of the structure of a sealing end cover for a rotating pair hinge mechanism in a parallel machine tool, provided by an embodiment of the present invention.

[0046] Figure 13 yes Figure 12 Structural cross-sectional view of the DD surface;

[0047] Figure 14 This is a schematic flowchart illustrating an assembly method for a rotary joint hinge mechanism in a parallel machine tool, provided by an embodiment of the present invention.

[0048] In the picture:

[0049] 1-Slide plate; 101-Mating hole; 102-End face sealing groove; 103-First mounting surface; 104-Second mounting surface; 2-Connecting rod; 201-Mounting interface; 202-First lug; 203-Second lug; 204-First bearing hole; 205-Second bearing hole; 206-Lubricating oil hole; 3-Rotating pair; 301-Rotating shaft; 302-Adjusting shim; 303-Rotating table bearing; 304-Sealing end cover; 3041-Sealing groove; 3042-Stop end face; 3043-Groove; 305-First sealing ring; 306-Second sealing ring; 307-Lubricating oil cup; 4-Electric spindle; 5-Moving platform; 6-Static platform; 7-Servo motor; 8-Ball screw pair; 9-Linear guide rail; 10-Spherical hinge pair. Detailed Implementation

[0050] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Figure 1 This is a schematic diagram of a revolute hinge mechanism for a parallel machine tool provided in an embodiment of the present invention. See also: Figure 1-4 The rotary joint hinge mechanism may include a slide plate 1, a connecting rod 2, and a rotary joint 3. The slide plate 1 is connected to the connecting rod 2 via the rotary joint 3. The slide plate 1 is mounted on a linear guide rail 9 and moves linearly under the drive of a servo motor 7 and a ball screw pair 8. The connecting rod 2 is mounted on the slide plate 1 via the rotary joint 3 and moves at an angular angle around the axis of the rotary joint 3. The rotary joint 3 includes a rotating shaft 301, an adjusting shim 302, and a turntable bearing 303. The two ends of the rotating shaft 301 are respectively inserted into the mating holes 101 on opposite sides of the slide plate 1, and the outer circle of the rotating shaft 301 is interference-fitted with the mating holes 101. The adjusting shim 302 and the turntable bearing 303 are both sleeved on the rotating shaft 301 and fixed on the slide plate 1. The adjusting shim 302 is used to adjust the installation distance between the turntable bearings 303 on both sides of the control. The inner ring of the turntable bearing 303 is transition-fitted with the outer circle of the rotating shaft 301, and the outer ring of the turntable bearing 303 is installed in the bearing hole of the connecting rod 2 and is transition-fitted.

[0055] In the above embodiments, such as Figure 4As shown, this rotary joint hinge can be applied to a tilting milling head employing a 3-PRS three-degree-of-freedom parallel mechanism. The support structure of this rotary joint hinge mainly uses two YRT rotary table bearings with an inner diameter of φ80mm. Since the YRT rotary table bearing is a thrust / radial combination bearing, it features a compact structure and high operational accuracy. It can withstand the combined effects of radial load, bidirectional axial load, and overturning moment. After installation and fixation, it can achieve axial and radial preload with no operational backlash, exhibiting high rotational accuracy and load-bearing rigidity. The rotating shaft 301 is designed as a detachable independent part, installed and fixed on the slide plate 1 through a slight interference fit and screw connection, ensuring both necessary structural rigidity and facilitating part machining and assembly.

[0056] In this rotary joint hinge, the inner ring of the turntable bearing 303 is mounted on the slide plate 1, and the outer ring is mounted on the connecting rod 2, enabling relative oscillation between the slide plate 1 and the connecting rod 2. For ease of assembly, such as... Figure 5-7 As shown, mating holes 101 are machined on both sides of the slide plate 1. One end of the rotating shaft 301 is inserted into the mating hole 101 and fixed in the mating hole 101 of the slide plate 1 by screws. The outer circle of the rotating shaft 301 and the mating hole 101 adopt a slight interference fit to ensure the necessary fit rigidity. The inner ring of the turntable bearing 303 is mounted on the rotating shaft 301 to achieve a centering fit. The inner ring of the turntable bearing 303 and the rotating shaft 301 adopt a transition fit for easy installation and removal. An adjusting shim 302 is provided between the turntable bearing 303 and the slide plate 1 to accurately adjust the installation distance between the two turntable bearings 303 and prevent additional axial force from being generated between the turntable bearings 303 on both sides. The inner ring of the turntable bearing 303 and the adjusting shim 302 are fixed together to the outer end face of the mating hole 101 of the slide plate 1 by screws. At the same time, an end face sealing groove 102 is also machined on the end face sealing groove 102. A second sealing ring 306 is installed in the end face sealing groove 102. The second sealing ring 306 can be a V-shaped sealing ring to prevent foreign objects from entering the turntable bearing 303 through the narrow gap between the slide plate 1 and the connecting rod 2, causing abnormal wear of the bearing.

[0057] As an optional implementation method, such as Figure 3 As shown, the rotating pair 3 also includes a sealing end cap 304 and a first sealing ring 305. The sealing end cap 304 is located outside the turntable bearing 303 and is installed on the outer end face of the bearing hole of the connecting rod 2. A sealing groove 3041 is provided on the outer circle of the stop of the sealing end cap 304. The first sealing ring 305 is installed in the sealing groove 3041 and is used to seal the turntable bearing 303. The first sealing ring 305 can be an O-ring seal, used to seal and protect the bearing space.

[0058] As an optional implementation method, such as Figure 5As shown, the lower end face of the slide plate 1 is provided with a first mounting surface 103 for connecting with the linear guide rail 9, and the end face of the slide plate 1 away from the connecting rod 2 is provided with a second mounting surface 104 for connecting with the ball screw assembly 8. Figure 8 As shown, one end of the connecting rod 2 is provided with a mounting interface 201 for mounting the spherical secondary hinge 10.

[0059] As an optional implementation method, such as Figure 10-11 As shown, the other end of the connecting rod 2 is provided with a first earring 202 and a second earring 203. The first earring 202 has a first bearing hole 204 along its axial direction, and the second earring 203 has a second bearing hole 205 along its axial direction. The two ends of the two turntable bearings 303 are respectively installed in the corresponding first bearing hole 204 and second bearing hole 205.

[0060] As an optional implementation method, such as Figure 3 As shown, the rotating pair 3 also includes lubricating oil cups 307. Two lubricating oil cups 307 are respectively installed on the lubricating oil holes 206 on the corresponding first lug 202 and second lug 203. The lubricating oil holes 206 are connected to the lubricating oil grooves on the outer ring of the turntable bearing 303. Grease is injected into the lubricating oil holes 206 through the lubricating oil cups 307. The grease enters the interior of the turntable bearing 303 along the oil grooves on the outer ring of the turntable bearing 303, realizing the replenishment and relubrication process of the turntable bearing 303.

[0061] As an optional implementation method, such as Figure 9 As shown, the middle part of the connecting rod 2 is concave. Specifically, the concave shape of the middle part of the connecting rod 2 helps to reduce motion interference between the connecting rod 2 and the electric spindle 4, and increases the motion space of the mechanism.

[0062] As an optional implementation method, such as Figure 12-13 As shown, the sealing end cover 304 has a stop end face 3042 for pressing against the outer ring of the turntable bearing 303. The stop end face 3042 has multiple slots 3043 along its circumference. During assembly, by grinding the stop end face 3042, the actual value of dimension h is precisely controlled, allowing the stop end face 3042 to press against the outer ring of the turntable bearing 303, thereby enhancing the axial installation rigidity of the turntable bearing 303. The multiple slots 3043 machined on the stop end face 3042, evenly distributed along the circumference, are used to avoid the mounting screws on the outer ring of the turntable bearing 303, preventing structural interference.

[0063] Figure 14 This is a schematic flowchart illustrating an assembly method for a revolute hinge mechanism in a parallel machine tool according to an embodiment of the present invention. (See attached diagram.) Figure 14 The method may include the following steps:

[0064] S701, Measure the first distance L1 between the inner end faces of the bearing holes on both sides of the connecting rod 2 (e.g., Figure 3 (As shown).

[0065] S702, Measure the second distance L2 between the bearing mounting end faces on both sides of the slide plate 1 (e.g., Figure 3 (As shown).

[0066] S703, measure the third distance L3 and the fourth distance L4 between the inner and outer ring mounting faces of the turntable bearings 303 on both sides respectively (e.g., Figure 3 (As shown).

[0067] It should be noted that the order of the measurement steps (i.e., steps S701, S702, and S703) for the first distance L1, the second distance L2, the third distance L3, and the fourth distance L4 is not specifically limited, as long as the corresponding measurement results can be obtained.

[0068] S704. Based on the first distance L1, the second distance L2, the third distance L3, and the fourth distance L4, determine the thickness t of the adjusting shim 302 (e.g., Figure 3 (As shown).

[0069] Specifically, the calculation formula is as follows:

[0070] t = (L1 - L2 - L3 - L4) / 2.

[0071] S705. Install the second sealing ring 306 in the end face sealing groove 101 of the slide plate 1.

[0072] S706. Screw the lubricating oil cup 307 into the lubricating oil hole 206 of the connecting rod 2.

[0073] S707. Align the first bearing hole 204 and the second bearing hole 205 on the connecting rod 2 with the corresponding mating holes 101 on the slide plate 1, and insert the two ends of the rotating shaft 301 through the first bearing hole 204 and the second bearing hole 205 respectively into the corresponding mating holes 101; install and tighten the connecting screws.

[0074] S708, Adjustment pads 302 at both ends of the rotating shaft 301, and turntable bearings 303.

[0075] Specifically, install the inner and outer ring connecting screws of the turntable bearing 304 and tighten them to the specified torque.

[0076] S709, measure the fifth distance L5 and the sixth distance L6 between the outer end face of the bearing hole of connecting rod 2 and the outer ring of turntable bearing 303 (e.g., ...). Figure 3 (As shown).

[0077] S710. Calculate the stop length h of the sealing end cap 304 based on the fifth distance L5 (or the sixth distance L6). Figure 3 (as shown), and grind the end face of the stop 3042.

[0078] Specifically, the calculation formula is as follows:

[0079] h = L5 + 0.03, or h = L6 + 0.03.

[0080] S711. Install the first sealing ring 305 into the sealing groove 3041 of the sealing end cover 304.

[0081] S712. Install the sealing end cap 304 on the connecting rod 2 so that the stop end face 3042 presses against the outer ring of the turntable bearing 303.

[0082] Specifically, install the connecting screws and tighten them to the specified torque.

[0083] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0084] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A revolute hinge mechanism for parallel machine tools, characterized in that, The system includes a slide plate (1), a connecting rod (2), and a revolute joint (3). The slide plate (1) is connected to the connecting rod (2) via the revolute joint (3). The slide plate (1) is mounted on a linear guide rail (9) and moves linearly under the drive of a servo motor (7) and a ball screw pair (8). The connecting rod (2) is mounted on the slide plate (1) via the revolute joint (3) and moves at an angular angle around the axis of the revolute joint (3). The rotating pair (3) includes a rotating shaft (301), an adjusting pad (302), and a turntable bearing (303). The two ends of the rotating shaft (301) are respectively inserted into the mating holes (101) on the opposite sides of the slide plate (1), and the outer circle of the rotating shaft (301) is interference-fitted with the mating hole (101). The adjusting shim (302) and the turntable bearing (303) are both sleeved on the rotating shaft (301) and fixed on the slide plate (1). The adjusting shim (302) is used to adjust the installation distance between the turntable bearings (303) on both sides to prevent additional axial force from being generated between the turntable bearings (303) on both sides. The inner ring of the turntable bearing (303) is transitionally fitted with the outer circle of the rotating shaft (301). The outer ring of the turntable bearing (303) is installed in the bearing hole of the connecting rod (2) and transitionally fitted. The turntable bearing (303) is a thrust and radial combination bearing.

2. The revolute hinge mechanism for parallel machine tools according to claim 1, characterized in that, The rotating pair (3) further includes a sealing end cap (304) and a first sealing ring (305). The sealing end cap (304) is located outside the turntable bearing (303) and is installed on the outer end face of the bearing hole of the connecting rod (2). A sealing groove (3041) is provided on the outer circle of the stop of the sealing end cap (304). The first sealing ring (305) is installed in the sealing groove (3041) and is used to seal the turntable bearing (303).

3. The revolute hinge mechanism for parallel machine tools according to claim 2, characterized in that, The rotating pair (3) also includes a second sealing ring (306). Both ends of the slide plate (1) are provided with end face sealing grooves (102). The second sealing ring (306) is located in the end face sealing grooves (102) and is sealed and fitted to the end face of the connecting rod (2).

4. The revolute hinge mechanism for parallel machine tools according to claim 1, characterized in that, The lower end face of the slide plate (1) is provided with a first mounting surface (103) for connecting with the linear guide rail (9), and the end face of the slide plate (1) away from the connecting rod (2) is provided with a second mounting surface (104) for connecting with the ball screw pair (8).

5. The revolute hinge mechanism for parallel machine tools according to claim 3, characterized in that, One end of the connecting rod (2) is provided with a mounting interface (201) for mounting a spherical secondary hinge (10).

6. The revolute hinge mechanism for parallel machine tools according to claim 5, characterized in that, The other end of the connecting rod (2) is provided with a first earring (202) and a second earring (203) opposite to each other. The first earring (202) has a first bearing hole (204) along its axial direction, and the second earring (203) has a second bearing hole (205) along its axial direction. The two ends of the two turntable bearings (303) are respectively installed in the corresponding first bearing hole (204) and second bearing hole (205).

7. The revolute hinge mechanism for parallel machine tools according to claim 6, characterized in that, The rotating pair (3) also includes a lubricating oil cup (307), and the two lubricating oil cups (307) are respectively installed on the lubricating oil holes (206) on the corresponding first earring (202) and second earring (203). The lubricating oil holes (206) are connected to the lubricating oil groove on the outer ring of the turntable bearing (303).

8. The revolute hinge mechanism for parallel machine tools according to any one of claims 1-7, characterized in that, The middle part of the connecting rod (2) is concave.

9. The revolute hinge mechanism for parallel machine tools according to claim 7, characterized in that, The sealing end cap (304) has a stop end face (3042) for pressing the outer ring of the turntable bearing (303), and the stop end face (3042) has a plurality of slots (3043) along its circumferential direction.

10. An assembly method for a revolute joint hinge mechanism for a parallel machine tool as described in any one of claims 1-9, characterized in that, The method includes the following steps: Measure the first distance between the inner end faces of the bearing holes on both sides of the connecting rod (2); Measure the second distance between the bearing mounting end faces on both sides of the slide plate (1); Measure the third and fourth distances between the inner and outer ring mounting faces of the turntable bearings (303) on both sides respectively; The thickness of the adjusting pad (302) is determined based on the first distance, the second distance, the third distance, and the fourth distance; The second sealing ring (306) is installed in the end face sealing groove (102) of the slide plate (1); Screw the lubricating oil cup (307) into the lubricating oil hole (206) of the connecting rod (2); Align the first bearing hole (204) and the second bearing hole (205) on the connecting rod (2) with the corresponding mating holes (101) on the slide plate (1), and insert the two ends of the rotating shaft (301) through the first bearing hole (204) and the second bearing hole (205) respectively into the corresponding mating holes (101); The adjusting pads (302) and the turntable bearings (303) are installed at both ends of the rotating shaft (301); Measure the fifth distance between the outer end face of the bearing hole of the connecting rod (2) and the outer ring of the turntable bearing (303); Calculate the stop length of the sealing end cap (304) based on the fifth distance, and grind the stop end face (3042); The first sealing ring (305) is installed in the sealing groove (3041) of the sealing end cap (304); Install the sealing end cap (304) on the connecting rod (2) so that the stop end face (3042) presses against the outer ring of the turntable bearing (303).

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