Assembly equipment for axisymmetric parts

Abstract

The utility model provides axial symmetry part assembling equipment, and relates to the field of part assembling equipment, and the axial symmetry part assembling equipment comprises a feeding tray, an assembling tray, a secondary positioning assembly, a taking assembly and a discharging assembly; the feeding tray is used for containing components forming the axisymmetric parts. A positioning groove for accommodating each component is formed in the assembling tray; the secondary positioning assembly is arranged between the feeding tray and the assembling tray and used for conducting secondary positioning on the component and rotating according to a preset angle. The material taking assembly comprises a first three-axis driving mechanism and a material taking suction cup mechanism and is used for carrying the parts into the secondary positioning assembly from the feeding tray. The discharging assembly comprises a second three-axis driving mechanism and a discharging suction cup mechanism and is used for carrying the parts from the secondary positioning assembly to the assembling material disc, and the parts are assembled in a positioning groove of the assembling material disc.

Description

Technical Field

[0001] This utility model relates to the field of parts assembly equipment, and in particular to an assembly equipment for axisymmetric parts. Background Technology

[0002] Axisymmetric parts are often assembled from two or more components with the same structure. Current technology generally involves manual assembly, which may require workers to identify the front and back of the components and rotate them, thus making it difficult to improve processing efficiency. To automate the assembly, multiple mechanisms are needed to assemble components in different directions onto the same fixture, and special trays for components in different directions are also required, resulting in excessively high equipment costs. Utility Model Content

[0003] The present invention aims to solve the problems in the background art and provide an assembly equipment for axisymmetric parts with high processing efficiency and low cost.

[0004] The technical solution used by this utility model to solve the above-mentioned technical problems is:

[0005] An assembly device for axisymmetric parts includes: a feeding tray, an assembly tray, a secondary positioning component, a picking component, and a discharging component.

[0006] The feeding tray is used to hold the components that make up the axisymmetric parts; the assembly tray is equipped with positioning slots to accommodate each component.

[0007] The secondary positioning component is set between the feeding tray and the assembly tray to perform secondary positioning of the parts and rotate them according to a preset angle.

[0008] The material handling assembly includes a first three-axis drive mechanism and a material handling suction cup mechanism, which are used to transport the parts from the loading tray to the secondary positioning assembly.

[0009] The feeding assembly includes a second three-axis drive mechanism and a feeding suction cup mechanism, which are used to transport the parts from the secondary positioning assembly to the assembly tray, and assemble the parts in the positioning slots of the assembly tray.

[0010] Furthermore, the secondary positioning component includes an angle motor and a positioning fixture. The angle motor is fixedly mounted below a support plate, and the positioning fixture is mounted above the support plate and connected to the output shaft of the angle motor through a through hole on the support plate.

[0011] Furthermore, the positioning fixture includes a fixture base, a rotating sleeve connected to the bottom of the fixture base, the rotating sleeve passing through a through hole and connected to the output shaft of the angle motor, and the rotating sleeve connected to the support plate through a bearing; a clamping block is installed on the upper part of the fixture base, and a pair of positioning protrusions for positioning the component are provided in the middle of the clamping block.

[0012] Furthermore, the clamp base is provided with a connecting hole coaxial with the rotating sleeve; the clamping block has jaws hinged to both ends of the positioning protrusion via rotating shafts, and cams are installed at the ends of the jaws; a connecting shaft is sleeved in the rotating sleeve, and the top end of the connecting shaft extends out of the connecting hole and connects with the cam; a thrust spring is installed on the connecting shaft, which is used to make the connecting shaft tend to move downward, so that the jaws are kept in a normally closed state; the connecting shaft is connected to an unlocking device for controlling the opening and closing of the jaws.

[0013] Furthermore, the unlocking device includes an unlocking cylinder fixed to the bottom of the support plate; a crossbar is installed at the bottom of the connecting shaft, and a pair of vertical sliding holes are horizontally arranged on the circumferential surface of the bottom of the rotating sleeve, with the two ends of the crossbar passing through the sliding holes respectively; the output end of the unlocking cylinder is connected to the crossbar.

[0014] Furthermore, it also includes a movable retaining ring, which is sleeved on the outside of the rotating sleeve, and both ends of the connecting shaft are connected to the inner ring of the movable retaining ring; the output end of the unlocking cylinder is connected to a horizontal plate, which is provided with a circular hole to avoid the rotating sleeve. The diameter of the circular hole is smaller than the outer diameter of the movable retaining ring, and it is used to push the movable retaining ring to move along the axis.

[0015] Furthermore, a collar is fixed in the middle of the connecting shaft, and a thrust spring is disposed between the collar and the clamp base; a linear bearing is installed between the collar and the crossbar on the connecting shaft, and the outer side of the linear bearing is connected to the inner wall of the rotating sleeve.

[0016] Furthermore, a square frame is provided at the top of the connecting shaft, and the square frame is provided with a transverse through hole. The cam extends into the transverse through hole, and the bottom of the clamping block is provided with a groove to accommodate the up and down movement of the square frame.

[0017] Furthermore, the fixture base is equipped with a strip-shaped position indicator bar, and the support plate is equipped with a proximity switch, which is used to detect the position of the position indicator bar.

[0018] Furthermore, the component has flat skeletons at both ends, with positioning holes on the skeletons. The positions of the positioning protrusions match the positioning holes, and clearance grooves are provided between the positioning protrusions. The depth of the clearance grooves is greater than the thickness of the component.

[0019] The assembly equipment for axisymmetric parts provided by this utility model can rotate the components that make up the axisymmetric parts, thereby obtaining components in different directions. Furthermore, it can transport the components in different directions to the assembly tray for assembly, realize the automated assembly of axisymmetric parts, improve production efficiency, and use the same tray to place components in different directions, thereby reducing equipment costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the assembly equipment for axisymmetric parts in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the secondary positioning component in an embodiment of the present invention;

[0022] Figure 3 This is a half-section front view of the secondary positioning component in an embodiment of this utility model;

[0023] Figure 4 This is a cross-sectional schematic diagram of the unlocking device in an embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the installation of the square frame in an embodiment of this utility model;

[0025] Figure 6 This is a schematic diagram of the clearance groove in an embodiment of the present invention.

[0026] Among them, 1: feeding tray; 2: assembly tray; 3: secondary positioning component; 4: picking component; 5: discharging component; 6: positioning fixture; 7: clamp base; 8: clamping block; 9: unlocking cylinder; 31: support plate; 32: angle motor; 41: first three-axis drive mechanism; 42: picking suction cup mechanism; 51: second three-axis drive mechanism; 52: discharging suction cup mechanism; 61: rotating sleeve; 62: connecting shaft; 63: thrust spring; 64: crossbar; 65: sliding hole; 66: moving retaining ring; 67: square frame; 81: positioning protrusion; 82: rotating shaft; 83: gripper; 84: cam; 85: clearance groove; 91: horizontal plate. Detailed Implementation

[0027] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly. The connection can be a direct connection or an indirect connection.

[0030] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] like Figure 1 The diagram shown is a structural schematic of an assembly device for an axisymmetric part according to an embodiment of this application. In this embodiment, the axisymmetric part is a cross-shaped part. The two components that make up the cross-shaped part have the same structure and are both elongated. During assembly, one of the components needs to be rotated 90 degrees.

[0032] The assembly equipment for axisymmetric parts provided in this embodiment includes: a feeding tray 1, an assembly tray 2, a secondary positioning component 3, a material picking component 4, and a material dispensing component 5.

[0033] In this embodiment, the loading tray 1 can hold the same type of elongated components without requiring orientation settings, thus reducing equipment costs. The assembly tray 2 can be equipped with grooves for positioning assembled axisymmetric parts, facilitating component positioning. During assembly, components in one orientation can be placed into the assembly tray 2 first, glued, and then components in the other orientation can be placed to complete the assembly. The secondary positioning component 3 is used for component rotation and secondary positioning, improving assembly accuracy. The picking component 4 picks up components from the loading tray 1 and transfers them to the secondary positioning component 3. The unloading component 5 picks up components from the secondary positioning component 3 and transfers them to the assembly tray. The picking and unloading components 4 and 5 can be robotic arms or multi-axis mechanisms, with suction cups or grippers connected to the moving end of the robotic arm or multi-axis mechanism to grasp the components.

[0034] The feeding tray 1 is used to hold the components that make up the axisymmetric part; the assembly tray 2 is provided with positioning slots for accommodating each component, so that the components can be assembled into an axisymmetric part.

[0035] The feeding tray 1 has grooves for positioning components, and the components in the feeding tray 1 have the same orientation. In this embodiment, the positioning groove of the assembly tray 2 is cross-shaped, which can position and assemble two components.

[0036] The secondary positioning component 3 is set between the feeding tray 1 and the assembly tray 2 to perform secondary positioning of the parts and rotate them at a preset angle.

[0037] The secondary positioning component 3 can achieve secondary positioning and rotation of the component through a combination of a positioning device and a rotating device. In this embodiment, the preset angle of the first component is 0 degrees, and the preset angle of the second component is 90 degrees, so that the two components can be assembled into a cross-shaped axisymmetric part. The feeding tray 1 and the assembly tray 2 are generally placed on the conveying mechanism, and the working position of the feeding tray 1 and the assembly tray 2 can be determined by the conveying mechanism.

[0038] The material handling assembly 4 includes a first three-axis drive mechanism 41 and a material handling suction cup mechanism 42, which are used to transport the parts from the loading tray 1 to the secondary positioning assembly 3; the material unloading assembly 5 includes a second three-axis drive mechanism 51 and a material unloading suction cup mechanism 52, which are used to transport the parts from the secondary positioning assembly 3 to the assembly tray 2.

[0039] The first three-axis drive mechanism 41 can be positioned between the loading tray 1 and the secondary positioning component 3, while the second three-axis drive mechanism 51 can be positioned between the secondary positioning component 3 and the assembly tray 2. The negative pressure suction cup mechanism facilitates the gripping of components and provides stability during movement. Preferably, the suction cup positions on the unloading suction cup mechanism 52 are designed according to the structure of the component to be gripped, enabling it to grip components with different rotation angles. The loading tray 1 can be stored in a lifting hopper, and a tray push-pull assembly is installed at the inlet and outlet of the lifting hopper. The tray push-pull assembly is used to move the loading tray 1 between its loading position and the lifting hopper. The assembly tray 2 can be placed on a conveyor rail, and a stop assembly is provided on the conveyor rail to determine the working position of the assembly tray.

[0040] The assembly equipment for axisymmetric parts provided in this embodiment can rotate the components that make up the axisymmetric parts, thereby obtaining components in different directions. Furthermore, it can transport the components in different directions to the assembly tray 2 for assembly, realizing the automated assembly of axisymmetric parts, improving production efficiency, and using the same tray to place components in different directions, reducing the use of handling devices, thereby reducing equipment costs.

[0041] like Figure 2 The diagram shown is a structural schematic of the secondary positioning component in this embodiment. In this embodiment, the secondary positioning component 3 includes an angle motor 32 and a positioning fixture 6. The angle motor 32 is fixedly installed below a support plate 31, and the positioning fixture 6 is installed above the support plate 31 and is connected to the output shaft of the angle motor 32 through a through hole on the support plate 31.

[0042] Preferably, multiple secondary positioning components 3 can be arranged on the support plate 31 to simultaneously position and rotate multiple parts, improving processing efficiency. The material handling suction cup mechanism 42 and the material unloading suction cup mechanism 52 need to be designed according to the number of secondary positioning components 3 so as to handle multiple parts simultaneously. The support plate 31 can be equipped with columns at both ends so that an angle motor 32 can be installed at its bottom. The output end of the angle motor 32 is connected to the positioning fixture 6, which can drive the positioning fixture 6 to rotate at a preset angle.

[0043] like Figure 3 The image shown is a half-section front view of the secondary positioning component in this embodiment. In this embodiment, the positioning fixture 6 includes a clamp base 7. A rotating sleeve 61 is connected to the bottom of the clamp base 7. The rotating sleeve 61 passes through a through hole and is connected to the output shaft of the angle motor 32. The rotating sleeve 61 is connected to the support plate 31 through a bearing. A clamping block 8 is installed on the upper part of the clamp base 7. A pair of positioning protrusions 81 for positioning the component are provided in the middle of the clamping block 8.

[0044] The lower end of the rotating sleeve 61 can be connected to the output shaft of the angle motor 32 via a coupling, thereby driving the entire clamp base 7 to rotate. Bearings can be installed outside the middle section of the rotating sleeve 61 to improve its stability. The clamping block 8 is used to position and fix the component. In this embodiment, the component has a skeleton structure at both ends. The skeleton structure can be cut off after assembly. The structure of the positioning protrusion 81 can be designed to match the features of the skeleton structure, such as engaging with holes in the skeleton structure. The positioning protrusion 81 in this application includes, but is not limited to, the structures described above, and can be any type of protrusion structure capable of positioning the component.

[0045] like Figure 3 and Figure 4 As shown, Figure 4 This is a cross-sectional view of the unlocking device in this embodiment. In this embodiment, the clamp base 7 is provided with a connecting hole coaxial with the rotating sleeve 61; the clamping block 8 has clamps 83 hinged at both ends of the positioning protrusion 81 via rotating shafts 82, and cams 84 are installed at the ends of the clamps 83; a connecting shaft 62 is sleeved in the rotating sleeve 61, and the top end of the connecting shaft 62 extends out of the connecting hole and is connected to the cam 84; a thrust spring 63 is installed on the connecting shaft 62, and the thrust spring 63 is used to make the connecting shaft 62 tend to move downward, so that the clamps 83 remain in a normally closed state; the connecting shaft 62 is connected to an unlocking device for controlling the opening and closing of the clamps 83.

[0046] The connecting hole penetrates the clamp base 7, allowing the connecting shaft 62 to pass through and contact the cam 84 of the gripper 83. Pushing the cam 84 controls the gripper 83 to rotate around the shaft 82, thus opening the gripper 83 and releasing the clamped component. This improves the positioning accuracy of the component on the secondary positioning assembly 3 and enhances the stability of the component as it rotates with the secondary positioning assembly 3. The unlocking device in this embodiment can be any device capable of pushing the connecting shaft 62 upwards against the force of the thrust spring 63 to unlock the gripper 83.

[0047] In this embodiment, the unlocking device includes an unlocking cylinder 9 fixed to the bottom of the support plate 31. A crossbar 64 is installed at the bottom end of the connecting shaft 62, and a pair of vertical sliding holes 65 are transversely provided on the circumferential surface of the bottom of the rotating sleeve 61. The two ends of the crossbar 64 pass through the sliding holes 65 respectively. The output end of the unlocking cylinder 9 is connected to the crossbar 64.

[0048] In this embodiment, the crossbar 64 connected to the bottom of the connecting shaft 62 can move up and down along the axial direction in the sliding hole 65 of the rotating sleeve 61 without affecting the rotation of the rotating sleeve 61. The gripper 83 of the clamping block 8 only needs to be unlocked when rotation stops. The unlocking cylinder 9 can be set in the corresponding position and can be detachably connected to the crossbar 64. It only drives the crossbar 64 to move upward when rotation stops to unlock the gripper 83.

[0049] In this embodiment, a movable retaining ring 66 is also included. The movable retaining ring 66 is sleeved on the outside of the rotating sleeve 61, and both ends of the connecting shaft 62 are connected to the inner ring of the movable retaining ring 66. The output end of the unlocking cylinder 9 is connected to a horizontal plate 91. The horizontal plate 91 is provided with a circular hole to avoid the rotating sleeve 61. The diameter of the circular hole is smaller than the outer diameter of the movable retaining ring 66, which is used to push the movable retaining ring 66 to move along the axis.

[0050] In this embodiment, one unlocking cylinder 9 can push two sets of movable retaining rings 66 via a horizontal plate 91, thereby controlling the operation of the two grippers 83. During use, the horizontal plate 91 moves upward, contacts the movable retaining rings 66, and continues to push the movable retaining rings 66 upward, achieving the effect of pushing the connecting shaft 62 upward and unlocking the grippers 83. The unlocking device provided in this embodiment provides uniform force when the connecting shaft 62 is moved, enabling stable unlocking of the grippers 83.

[0051] like Figure 5 As shown, this is a schematic diagram of the installation of the square frame in this embodiment. In this embodiment, a square frame 67 is provided on the top of the connecting shaft 62. The square frame 67 is provided with a transverse through hole. The cam 84 extends into the transverse through hole. The bottom of the clamping block 8 is provided with a groove to accommodate the up and down movement of the square frame 67.

[0052] The square frame 67 engages with the cam 84 of the gripper 83, applying an upward thrust to the cam 84 to unlock the gripper 83. It also applies a downward thrust to the cam 84 to prevent the gripper from failing to clamp the component if the thrust spring 63 malfunctions, thus improving the reliability of this embodiment during operation.

[0053] In this embodiment, a collar is fixed in the middle of the connecting shaft 62, and a thrust spring 63 is disposed between the collar and the clamp base 7. A linear bearing is installed between the connecting shaft 62 and the crossbar 64, and the outer side of the linear bearing is connected to the inner wall of the rotating sleeve 61.

[0054] The thrust spring 63 pushes the collar, causing the connecting shaft 62 to have a downward tendency to move, thereby keeping the gripper 83 in a normally closed state. The linear bearing can improve the stability of the connecting shaft 62 when it moves relative to the rotating sleeve 61.

[0055] In this embodiment, the fixture base 7 is equipped with a strip-shaped position indicator bar, and the support plate 31 is equipped with a proximity switch, which is used to detect the position of the position indicator bar.

[0056] Among them, the proximity switch can further improve the rotation accuracy of the angle motor 32, making the positional accuracy of the component when it is transferred from the secondary positioning component 3 to the assembly tray 2 higher, thus improving the assembly accuracy.

[0057] like Figure 6 As shown, this is a schematic diagram of the clearance groove in this embodiment. In this embodiment, flat skeletons are provided at both ends of the component, and positioning holes are provided on the skeletons. The positions of the positioning protrusions 81 match the positioning holes, and clearance grooves 85 are provided between the positioning protrusions 81. The depth of the clearance grooves 85 is greater than the thickness of the component.

[0058] In general, components that make up electronic parts are designed with auxiliary structures such as skeletons for easy clamping during processing, and then cut after assembly. This embodiment provides a positioning protrusion 81 structure for use when assembling components with flat skeletons. By cooperating with the positioning holes on the flat skeleton, it can further improve positioning accuracy, eliminating the need for contour grooves to position the components. The clearance groove 85 can solve the problem of different thicknesses on the front and back sides of the component, thus enabling the clamping of components with either the front or back facing up. For some axisymmetric parts, it is necessary to fit two components with the same structure together on the same side during assembly. The assembly equipment for axisymmetric parts provided in this embodiment is suitable for the above situation, requiring only two sets of feeding trays 1 for feeding.

[0059] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. An assembly device for axisymmetric parts, characterized in that, include: The feeding tray (1), the assembly tray (2), the secondary positioning component (3), the material picking component (4), and the material discharging component (5); The loading tray (1) is used to hold the components that make up the axisymmetric parts; the assembly tray (2) is provided with positioning grooves for accommodating each of the components; The secondary positioning component (3) is disposed between the loading tray (1) and the assembly tray (2) for secondary positioning of the component and rotation at a preset angle; The material handling assembly (4) includes a first three-axis drive mechanism (41) and a material handling suction cup mechanism (42), which are used to transport the component from the loading tray (1) to the secondary positioning assembly (3); The feeding assembly (5) includes a second three-axis drive mechanism (51) and a feeding suction cup mechanism (52) for transporting the component from the secondary positioning assembly (3) to the assembly tray (2) and assembling the component in the positioning groove of the assembly tray (2).

2. The assembly equipment for axisymmetric parts according to claim 1, characterized in that, The secondary positioning component (3) includes an angle motor (32) and a positioning fixture (6). The angle motor (32) is fixedly installed below a support plate (31), and the positioning fixture (6) is installed above the support plate (31) and connected to the output shaft of the angle motor (32) through a through hole on the support plate (31).

3. The assembly equipment for axisymmetric parts according to claim 2, characterized in that, The positioning fixture (6) includes a clamp base (7), a rotating sleeve (61) is connected to the bottom of the clamp base (7), the rotating sleeve (61) passes through the through hole and is connected to the output shaft of the angle motor (32), and the rotating sleeve (61) is connected to the support plate (31) through a bearing; a clamping block (8) is installed on the upper part of the clamp base (7), and a pair of positioning protrusions (81) for positioning the component are provided in the middle of the clamping block (8).

4. The assembly equipment for axisymmetric parts according to claim 3, characterized in that, The clamp base (7) is provided with a connecting hole coaxial with the rotating sleeve (61); the clamping block (8) has jaws (83) hinged to both ends of the positioning protrusion (81) via rotating shafts (82), and a cam (84) is installed at the end of the jaws (83); a connecting shaft (62) is sleeved in the rotating sleeve (61), the top end of the connecting shaft (62) extends out of the connecting hole and is connected to the cam (84); a thrust spring (63) is installed on the connecting shaft (62), the thrust spring (63) is used to make the connecting shaft (62) tend to move downward, so that the jaws (83) remain in a normally closed state; the connecting shaft (62) is connected to an unlocking device, which is used to control the opening and closing of the jaws (83).

5. The assembly equipment for axisymmetric parts according to claim 4, characterized in that, The unlocking device includes an unlocking cylinder (9) fixed to the bottom of the bracket plate (31); a crossbar (64) is installed at the bottom end of the connecting shaft (62); a pair of vertical sliding holes (65) are horizontally provided on the circumferential surface of the bottom of the rotating sleeve (61); the two ends of the crossbar (64) pass through the sliding holes (65) respectively; the output end of the unlocking cylinder (9) is connected to the crossbar (64).

6. The assembly equipment for axisymmetric parts according to claim 5, characterized in that, It also includes a movable retaining ring (66), which is sleeved on the outside of the rotating sleeve (61). Both ends of the connecting shaft (62) are connected to the inner ring of the movable retaining ring (66). The output end of the unlocking cylinder (9) is connected to a horizontal plate (91). The horizontal plate (91) is provided with a circular hole to avoid the rotating sleeve (61). The diameter of the circular hole is smaller than the outer diameter of the movable retaining ring (66), which is used to push the movable retaining ring (66) to move along the axis.

7. The assembly equipment for axisymmetric parts according to claim 5, characterized in that, A collar is fixed in the middle of the connecting shaft (62), and the thrust spring (63) is disposed between the collar and the clamp base (7); a linear bearing is installed between the collar and the crossbar (64) of the connecting shaft (62), and the outer side of the linear bearing contacts the inner wall of the rotating sleeve (61).

8. The assembly equipment for axisymmetric parts according to claim 4, characterized in that, The top of the connecting shaft (62) is provided with a square frame (67), the square frame (67) is provided with a transverse through hole, the cam (84) extends into the transverse through hole, and the bottom of the clamping block (8) is provided with a groove to accommodate the up and down movement of the square frame (67).

9. The assembly equipment for axisymmetric parts according to claim 3, characterized in that, The fixture base (7) is equipped with a strip-shaped position indicator bar, and the bracket plate (31) is equipped with a proximity switch, which is used to detect the position of the position indicator bar.

10. The assembly equipment for axisymmetric parts according to claim 3, characterized in that, The component has a flat skeleton at both ends, and a positioning hole is provided on the skeleton. The position of the positioning protrusion (81) matches the positioning hole. An avoidance groove (85) is provided between the positioning protrusions (81), and the depth of the avoidance groove (85) is greater than the thickness of the component.

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