Rectifier assembling equipment

Abstract

The invention discloses rectifier assembling equipment, and relates to the technical field of rectifier assembling equipment, the rectifier assembling equipment comprises an assembling disc, and a first part conveying unit, a second part conveying unit, a part conveying and assembling unit and a discharging unit which are sequentially arranged on the peripheral side of the assembling disc in a circumferential array manner. A plurality of material grooves are formed in the assembling disc, and stabilizing assemblies are arranged on the sides, above the material grooves, of the assembling disc respectively. The first part conveying unit is used for conveying rectification chips to the side grooves. And the second part conveying unit is used for conveying the lower shell into the trough. And the part conveying and assembling unit is used for conveying the upper shell of the rectifier to the position above the material groove and assembling the rectifier. The discharging unit is used for discharging the assembled rectifiers from the assembling disc and conveying the rectifiers. According to the automatic assembling and discharging device, all parts of the rectifier can be automatically fed, assembling of the rectifier is automatically completed, automatic discharging is achieved, and manpower is saved.

Description

Technical Field

[0001] This invention relates to the field of rectifier assembly equipment technology, and more particularly to a rectifier assembly equipment. Background Technology

[0002] A rectifier is a device that converts alternating current (AC) to direct current (DC). It uses the unidirectional conductivity of diodes to eliminate the reverse portion of the AC waveform, thereby achieving the conversion from AC to DC.

[0003] Different types of rectifiers have different assembly methods during production. One type of rectifier uses two housings to encase the rectifier chip with the rectifier bridge, providing protection. Current technology typically uses a purely manual assembly method, placing the two housings and the rectifier chip in three separate baskets. Workers then manually assemble and press the parts together after removing them from the baskets. This method is labor-intensive and inefficient. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides a rectifier assembly device that can automatically load various rectifier components, automatically assemble the rectifier, and automatically unload components, thus saving manpower.

[0005] In order to achieve the objectives of this invention, the following technologies are proposed: A rectifier assembly apparatus, comprising: The assembly plate rotates along its own vertical axis in the horizontal plane. Its upper end face has 4n material grooves that penetrate the outer periphery in a circular array, where n≥2. The bottom wall of the material groove has a top hole that penetrates vertically downward. The inner end wall of the material groove is recessed towards the axis of the assembly plate to form a groove. The upper part of the two side walls of the material groove is respectively provided with side grooves. The assembly plate has a stabilizing component for limiting the position of the rectifier parts on one side above each material groove. The first component conveying unit is located on the outer periphery of the assembly tray and is used to convey rectifier chips onto the side slot. The second parts conveying unit is located on the outer periphery of the assembly tray and is used to convey the lower outer shell into the material trough; The parts conveying and assembly unit is located on the outer periphery of the assembly tray and is used to convey the upper housing of the rectifier to the top of the material trough and to assemble the rectifier. The parts conveying and assembly unit includes a transfer and pressing assembly for transferring the upper housing to the lower housing and rectifier chip placed on the material trough and pressing down the upper housing during rectifier assembly. The parts conveying and assembly unit also includes n fifth linear mechanisms located vertically below the assembly tray. The output end of the fifth linear mechanism is provided with a top plate for moving and passing through the top hole during operation. The unloading unit, located on the outer periphery of the assembly tray, is used to unload and transport the assembled rectifier from the assembly tray.

[0006] Furthermore, the stabilizing component includes a first linear mechanism, the output end of which is provided with a first rotary motor whose output shaft is parallel to the output direction of the first linear mechanism, the output end of the first rotary motor is provided with a rotating plate, and one end of the rotating plate is provided with an L-shaped block.

[0007] Furthermore, the first part conveying unit includes n first conveyor belts arranged circumferentially along the assembly tray and with the conveying direction pointing towards the axis of the assembly tray, and its conveying plane is on the same horizontal plane as the inner bottom surface of the side trough; the second part conveying unit includes n second conveyor belts arranged circumferentially along the assembly tray and with the conveying direction pointing towards the axis of the assembly tray, and its conveying plane is on the same horizontal plane as the material trough; the transfer pressing assembly includes n third conveyor belts arranged circumferentially along the assembly tray and with the conveying direction pointing towards the axis of the assembly tray, and n second linear mechanisms located above the assembly tray and with their output directions parallel to the conveying directions of each of the third conveyor belts, the output ends of the second linear mechanisms are vertically provided with third linear mechanisms, the output ends of the third linear mechanisms are provided with a pair of fourth linear mechanisms with opposite output directions, and the output ends of the fourth linear mechanisms are provided with L-shaped carrier plates.

[0008] Furthermore, the unloading unit includes n fourth conveyor belts arranged circumferentially along the assembly tray and whose conveying direction is radially away from the assembly tray, and a sixth linear mechanism vertically arranged above the assembly tray. The output end of the sixth linear mechanism is provided with n seventh linear mechanisms whose output direction is parallel to the conveying direction of a corresponding third conveyor belt. The output end of the seventh linear mechanism is provided with a vertical plate that matches the groove, which is used to push the rectifier onto the fourth conveyor belt.

[0009] The beneficial effects of this technical solution are as follows: The rectifier chip, lower casing, and upper casing can be automatically fed onto the assembly tray in sequence. Then, each part can be positioned and automatically assembled. The assembled rectifier can be automatically unloaded, which can save manpower and improve production efficiency. Attached Figure Description

[0010] Figure 1 An overall perspective view of an embodiment of this application is shown.

[0011] Figure 2 This is a perspective view of the entire embodiment of the present application, excluding the second rotary motor, each bracket, each inverted L-shaped frame, and the connecting plate.

[0012] Figure 3 A partial perspective view of the first part conveying unit and assembly tray according to an embodiment of this application is shown.

[0013] Figure 4 An embodiment of this application is shown. Figure 3 Enlarged view of part A.

[0014] Figure 5A partial perspective view of the second parts conveying unit and assembly tray according to an embodiment of this application is shown.

[0015] Figure 6 A partial perspective view of the parts conveying assembly unit and assembly tray according to an embodiment of this application is shown. Figure 1 .

[0016] Figure 7 A perspective view of a portion of the assembly disk and rectifier components according to an embodiment of this application is shown.

[0017] Figure 8 A partial perspective view of the parts conveying assembly unit and assembly tray according to an embodiment of this application is shown. Figure 2 .

[0018] Figure 9 A perspective view of a portion of the feeding unit and assembly tray according to an embodiment of this application is shown.

[0019] Figure 10 A perspective view of a rectifier according to an embodiment of this application is shown.

[0020] Figure 11 An exploded view of a rectifier according to an embodiment of this application is shown.

[0021] The diagram shows the following components: Assembly tray 1, material trough 11, top hole 12, groove 13, side groove 14, first linear mechanism 15, L-shaped pallet 16, first rotary motor 17, rotating plate 18, L-shaped block 19, first parts conveying unit 2, first conveyor belt 21, second parts conveying unit 3, second conveyor belt 31, parts conveying assembly unit 4, third conveyor belt 41, second linear mechanism 42, third linear mechanism 43, first lifting plate 44, fourth linear mechanism 45, L-shaped carrier plate 46, fifth linear mechanism 47, top plate 4. 8. Unloading unit 5. Fourth conveyor belt 51. Second conveyor frame 52. Sixth linear mechanism 53. Second lifting plate 54. Hanging plate 55. Seventh linear mechanism 56. Vertical plate 57. Second rotary motor 6. Rectifier chip 71. Pin 72. Lower housing 73. Slot 74. Lower pin slot 75. Upper housing 76. Insert rod 77. Upper pin slot 78. First bracket 81. First inverted L-shaped frame 82. Connecting plate 83. Second bracket 84. Second inverted L-shaped frame 85. First conveyor frame 91. Horizontal plate 92. Limiting plate 93. Detailed Implementation

[0022] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1-9 The rectifier assembly equipment shown includes an assembly tray 1, and a first part conveying unit 2, a second part conveying unit 3, a part conveying assembly unit 4, and a unloading unit 5 arranged sequentially in a circumferential array on its outer periphery. This equipment is used to assemble components such as... Figure 11The components of each rectifier shown are assembled as follows: Figure 10 The rectifier shown in this embodiment adopts a plug-in structure, including a rectifier chip 71 with two bent pins 72 on each side. The lower housing 73 and the upper housing 76 of the rectifier are both made of plastic. A lower chip slot is opened in the center of the upper end face of the lower housing 73. Slots 74 are opened at the four corners of the upper loop-shaped part of the lower housing 73. Two lower pin slots 75 are provided on both sides of the upper loop-shaped part of the lower housing 73. An upper chip slot is opened in the center of the lower end face of the upper housing 76. Insert rods 77 matching the slots 74 are provided at the four corners of the lower loop-shaped part of the upper housing 76. Two upper pin slots 78 are provided on both sides of the lower loop-shaped part of the upper housing 76. When the lower housing 73 and the upper housing 76 are plugged in, the lower pin slots 75 and the upper pin slots 78 tightly clamp the pins 72.

[0024] like Figures 1-9 As shown, the assembly disk 1 has a vertical axis and rotates along its own vertical axis in the horizontal plane. The upper surface of the assembly disk 1 has 4n material slots 11 arranged in a circular array, penetrating the outer periphery, where n ≥ 2 and n is a positive integer. The material slots 11 are used to store the lower outer casing 73 of the rectifier. A top hole 12 is vertically opened through the bottom wall of each material slot 11. The inner end wall of each material slot 11 is recessed towards the axis of the assembly disk 1 to form a groove 13. Side slots 14 are also provided on the upper part of the two side walls of each material slot 11 for placing the pins 72 of the rectifier chip 71. The assembly disk 1 has stabilizing components on one side above each material slot 11 for limiting the position of the rectifier components. For ease of illustration, in… Figures 3-9 Not all stabilizing components are shown. The stabilizing components include a first linear mechanism 15, whose output end has an L-shaped support plate 16. A first rotary motor 17, whose output shaft is parallel to the output direction of the first linear mechanism 15, is fixed to one side of the vertical portion of the L-shaped support plate 16. A rotating plate 18 is provided at the output end of the first rotary motor 17, and an L-shaped block 19 is provided at one end of the rotating plate 18. A second rotary motor 6 is vertically arranged below the assembly plate 1, and the assembly plate 1 is fixed to the output end of the second rotary motor 6. Figure 7 As shown, when the lower outer shell 73 is placed in the material tank 11 and the rectifier chip 71 is placed in the side groove 14, and when the L-shaped block 19 is rotated to the vertical position, one end of the horizontal part of the L-shaped block 19 abuts against one end of the rectifier chip 71, and the rectifier chip 71 abuts against one end wall in the material tank 11, and one side of the vertical part of the L-shaped block 19 abuts against one end of the lower outer shell 73, and the lower outer shell 73 abuts against one end wall in the side groove 14, so as to prevent the two parts from sliding when the assembly plate 1 rotates.

[0025] like Figures 1-4As shown, the first component conveying unit 2 is located at one end of the outer periphery of the assembly tray 1 and is used to convey rectifier chips 71 with pins 72 onto the side groove 14. The first component conveying unit 2 includes n first conveyor belts 21 arranged circumferentially along the assembly tray 1 and with the conveying direction pointing towards the axis of the assembly tray 1. The conveying plane of the conveyor belt 21 is at the same level as the inner bottom surface of the side groove 14. Limiting components are provided on both sides of the first conveyor belt 21. The limiting components include a first conveyor frame 91. A horizontal plate 92 is provided at the upper end of the first conveyor frame 91. A limiting plate 93 for limiting the components of the rectifier is provided at one end of the horizontal plate 92. Specifically, a number of first supports 81 are provided at the lower end of the first conveyor frame 91. The limiting components on both sides of the first conveyor belt 21 are used to make the geometric center line of each rectifier chip 71 on the first conveyor belt 21 parallel to the conveying direction of the first conveyor belt 21.

[0026] like Figure 1 , Figure 2 , Figure 5 As shown, the second part conveying unit 3 is located on one side of the outer periphery of the assembly tray 1 and is used to convey the lower outer shell 73 into the material trough 11. The second part conveying unit 3 includes n second conveyor belts 31 arranged circumferentially along the assembly tray 1 and with the conveying direction pointing towards the axis of the assembly tray 1. The conveying plane of the conveyor belt 31 is located on the same horizontal plane as the material trough 11. Limiting components are also provided on both sides of the second conveyor belt 31, and the limiting components on both sides of the second conveyor belt 31 are used to make the line connecting the geometric centers of each lower outer shell 73 on the second conveyor belt 31 parallel to the conveying direction of the second conveyor belt 31.

[0027] like Figure 1 , Figure 2 , Figure 6 , Figure 8As shown, the parts conveying and assembly unit 4 is located at the other end of the outer periphery of the assembly tray 1. It is used to convey the upper housing 76 of the rectifier to the material tank 11 above which the lower housing 73 and the rectifier chip 71 have been placed, and to assemble the rectifier. The parts conveying and assembly unit 4 includes n third conveyor belts 41 arranged circumferentially along the assembly tray 1 and with the conveying direction pointing towards the axis of the assembly tray 1. Its conveying plane is higher than the conveying plane of the first conveyor belt 21. Limiting components are also provided on both sides of the third conveyor belt 41. The limiting components on both sides of the third conveyor belt 41 are used to make the line connecting the geometric centers of each upper housing 76 on the third conveyor belt 41 parallel to the conveying direction of the third conveyor belt 41. Specifically, for the rectifier in this embodiment, since the distance between the outermost ends of the pins at both ends is greater than the width of the lower housing 73 and also greater than the width of the upper housing 76, it is obvious that the distance between the two limiting plates 93 of the paired limiting components assembled on the first parts conveying unit 2 is greater than that between the second parts conveying unit 3 and the parts conveying unit 21. The distance between the two limiting plates 93 of the paired assembly limiting components on the conveying assembly unit 4 is as follows: The parts conveying assembly unit 4 also includes n second linear mechanisms 42 located above the assembly tray 1 and whose output direction is parallel to the conveying direction of each third conveyor belt 41. Specifically, a connecting plate 83 is provided between the sides of the second linear mechanisms 42, and a first inverted L-shaped frame 82 is provided on one side of the connecting plate 83. A third linear mechanism 43 is vertically provided at the output end of the second linear mechanism 42. A first lifting plate 44 is provided at the output end of the third linear mechanism 43. A pair of fourth linear mechanisms 45 with opposite output directions are provided at the lower end of the first lifting plate 44. An L-shaped carrier plate 46 is provided at the output end of the fourth linear mechanism 45. The parts conveying assembly unit 4 also includes n fifth linear mechanisms 47 vertically located below the assembly tray 1. Specifically, a second bracket 84 is provided at the lower end of the fifth linear mechanism 47. A top plate 48 for moving and passing through the top hole 12 during operation is provided at the output end of the fifth linear mechanism 47.

[0028] like Figure 1 , Figure 2 , Figure 9 As shown, the unloading unit 5 is located on the other side of the outer periphery of the assembly tray 1, and is used to unload the assembled rectifier from the assembly tray 1 and transport it. The unloading unit 5 includes n fourth conveyor belts 51 arranged around the circumference of the assembly tray 1 and the conveying direction is radially away from the assembly tray 1. The fourth conveyor belts 51 are respectively provided with second conveyor frames 52 on both sides. The unloading unit 5 also includes a sixth linear mechanism 53 vertically arranged above the assembly tray 1. Specifically, the sixth linear mechanism 53 is provided with a second inverted L-shaped frame 85 on one side. The output end of the sixth linear mechanism 53 is provided with a second lifting plate 54. The lower end of the second lifting plate 54 is provided with n hanging plates 55. The lower end of the hanging plate 55 is provided with a seventh linear mechanism 56 whose output direction is parallel to the conveying direction of a corresponding third conveyor belt 41. The output end of the seventh linear mechanism 56 is provided with a vertical plate 57 that matches the groove 13, and is used to push the rectifier onto the fourth conveyor belt 51.

[0029] In this embodiment, the first linear mechanism 15, the second linear mechanism 42, the third linear mechanism 43, the fourth linear mechanism 45, the fifth linear mechanism 47, the sixth linear mechanism 53, and the seventh linear mechanism 56 all adopt single-axis linear cylinders.

[0030] Work style: First, material loading is performed by starting the first conveyor belt 21, the second conveyor belt 31, and the third conveyor belt 41, and placing the rectifier chip 71, the lower housing 73, and the upper housing 76 one after another at the starting end of each conveyor belt, ensuring a certain distance between the parts on each conveyor belt. Once the conveyor belts are full, they are stopped. In the initial state, the first rotary motor 17 of each stabilizing component keeps the rotating plate 18 in a vertical position, as shown below. Figure 4 As shown, the L-shaped block 19 is designed so that it does not obstruct the movement of parts on each conveyor belt and assembly tray 1. The second rotary motor 6 rotates the assembly tray 1 so that each trough 11 corresponds to the conveying end of a conveyor belt. Specifically, the conveying direction of any conveyor belt is perpendicular to the end face of a trough 11 where a groove 13 is provided.

[0031] First, the first part conveying unit 2 operates, causing the rectifier chip 71 to be fed into the corresponding side slot 14. Specifically, through the conveying of the first conveyor belt 21, a rectifier chip 71 is sent into the side slot 14. Preferably, the distance between the opposite surfaces of the two side slots 14 arranged in pairs should be the same as or slightly larger than the distance between the farthest ends of the two pins 72 on both sides of the rectifier chip 71 by 1mm to 2mm. Under the action of inertia, the rectifier chip 71 will enter the side slot 14 and approach the inner end face of the side slot 14. At this time, the pins 72 can be further made to abut the inner end face of the side slot 14 and the rectifier chip 71 to abut the inner end face of the material tray 11 by the stabilizing component. It is only necessary to push out the first rotary motor 17 through the first linear mechanism 15, and then make the rotating plate 18 rotate, so that the L-shaped block 19 contacts the rectifier chip 71, and the first linear mechanism 15 pulls the rectifier chip 71. Then, depending on the magnitude of the centrifugal force, it is decided whether the L-shaped block 19 maintains contact or the stabilizing component returns to its initial state so that the rectifier chip 71 does not detach from the assembly tray 1.

[0032] Then, the assembly tray 1 rotates, causing the material tank 11 where each rectifier chip 71 is located to rotate to the position corresponding to the second conveyor belt 31. Then, the lower housing 73 is loaded through the second part conveying unit 3. Specifically, the lower housing 73 is sent into the material tank 11 through the second conveyor belt 31, and the lower housing 73 is located below the rectifier chip 71. Similarly, the lower housing 73 can also be made to abut the inner end face of the material tank 11 by the stabilizing component.

[0033] Then, the assembly tray 1 continues to rotate, causing the material tray 11 containing each rectifier chip 71 and the lower housing 73 to rotate to the position corresponding to the third conveyor belt 41, and then the L-shaped block 19 is positioned as follows: Figure 7 In the indicated state, the rectifier chip 71 and the lower housing 73 are pressed and positioned in the direction of the assembly tray axis. Then, the L-shaped block 19 is removed. At this time, the upper housing 76 is not transported by the third conveyor belt 41. Instead, the position of the L-shaped carrier plate 46 is moved by the second linear mechanism 42 and the third linear mechanism 43. The L-shaped carrier plate 46 clamps the upper housing 76 from both ends below. Then, the upper housing 76 is placed on the rectifier chip 71. Then, the L-shaped carrier plate 46 is released from clamping and moved so that its bottom end abuts against the top surface of the upper housing 76. Then, the top plate 48 is raised by the fifth linear mechanism 47, pushing the lower housing 73 and the rectifier chip 71 upward to press against the upper housing 76, thus completing the rectifier assembly.

[0034] Then, the assembly plate 1 continues to rotate, causing the rectifier to rotate to the position corresponding to the fourth conveyor belt 51. The vertical plate 57 enters the groove 13 through the sixth linear mechanism 53 and the seventh linear mechanism 56. Then, the rectifier is pushed to the fourth conveyor belt 51 through the seventh linear mechanism 56, and the fourth conveyor belt 51 delivers the rectifier.

[0035] In addition, after each rotation of the assembly tray 1, the first part conveying unit 2, the second part conveying unit 3, the part conveying assembly unit 4, and the unloading unit 5 can continuously perform the corresponding work for each unit on the rectifier parts or the rectifier itself.

[0036] The above are only some of the embodiments listed in this application and are not intended to limit this application.

Claims

1. A rectifier assembly device, characterized in that, include: The assembly plate (1) rotates along its own vertical axis in the horizontal plane. Its upper end face is provided with 4n material grooves (11) that penetrate the outer periphery in a circular array, n≥2. The bottom wall of the material groove (11) is provided with a top hole (12) that penetrates vertically downward. The inner end wall of the material groove (11) is recessed towards the axis of the assembly plate (1) to form a groove (13). The upper part of the two side walls of the material groove (11) is provided with side grooves (14). The assembly plate (1) is provided with a stabilizing component for limiting the parts of the rectifier on one side above each material groove (11). The first part conveying unit (2) is located on the outer periphery of the assembly tray (1) and is used to convey the rectifier chip (71) onto the side groove (14). The second parts conveying unit (3) is located on the outer periphery of the assembly tray (1) and is used to convey the lower outer shell (73) into the material trough (11). The parts conveying assembly unit (4) is located on the outer periphery of the assembly tray (1) and is used to convey the upper housing (76) of the rectifier to the top of the material tank (11) and to assemble the rectifier. The parts conveying assembly unit (4) includes a transfer pressing assembly for transferring the upper housing (76) to the top of the lower housing (73) and the rectifier chip (71) placed on the material tank (11) and pressing down the upper housing (76) when assembling the rectifier. The parts conveying assembly unit (4) also includes n fifth linear mechanisms (47) located vertically below the assembly tray (1). The output end of the fifth linear mechanism (47) is provided with a top plate (48) for moving and passing through the top hole (12) during operation. The unloading unit (5) is located on the outer periphery of the assembly tray (1) and is used to unload the assembled rectifier from the assembly tray (1) and transport it.

2. The rectifier assembly equipment according to claim 1, characterized in that, A second rotary motor (6) is arranged vertically below the assembly plate (1), and the assembly plate (1) is fixed to the output end of the second rotary motor (6).

3. The rectifier assembly equipment according to claim 1, characterized in that, The stabilizing component includes a first linear mechanism (15), and its output end is provided with a first rotary motor (17) whose output shaft is parallel to the output direction of the first linear mechanism (15). The output end of the first rotary motor (17) is provided with a rotating plate (18), and one end of the rotating plate (18) is provided with an L-shaped block (19).

4. The rectifier assembly equipment according to claim 1, characterized in that, The first part conveying unit (2) includes n first conveyor belts (21) arranged circumferentially along the assembly plate (1) and with the conveying direction pointing to the axis of the assembly plate (1), and its conveying plane is on the same horizontal plane as the inner bottom surface of the side groove (14); the second part conveying unit (3) includes n second conveyor belts (31) arranged circumferentially along the assembly plate (1) and with the conveying direction pointing to the axis of the assembly plate (1), and its conveying plane is on the same horizontal plane as the material trough (11); the transfer pressing assembly includes n third conveyor belts (41) arranged circumferentially along the assembly plate (1) and with the conveying direction pointing to the axis of the assembly plate (1), and n second linear mechanisms (42) located above the assembly plate (1) and whose output direction is parallel to the conveying direction of each third conveyor belt (41), the output end of the second linear mechanism (42) is vertically provided with a third linear mechanism (43), the output end of the third linear mechanism (43) is provided with a pair of fourth linear mechanisms (45) arranged opposite to each other in the output direction, and the output end of the fourth linear mechanism (45) is provided with an L-shaped carrier plate (46).

5. The rectifier assembly equipment according to claim 1, characterized in that, The unloading unit (5) includes n fourth conveyor belts (51) arranged circumferentially along the assembly tray (1) and whose conveying direction is radially away from the assembly tray (1), and a sixth linear mechanism (53) vertically arranged above the assembly tray (1). The output end of the sixth linear mechanism (53) is provided with n seventh linear mechanisms (56) whose output direction is parallel to the conveying direction of a corresponding third conveyor belt (41). The output end of the seventh linear mechanism (56) is provided with a vertical plate (57) that matches the groove (13) for pushing the rectifier onto the fourth conveyor belt (51).

6. The rectifier assembly equipment according to claim 4, characterized in that, Limiting components are provided on both sides of the first conveyor belt (21). The limiting components include the first conveyor frame (91), the upper end of the first conveyor frame (91) is provided with a horizontal plate (92), and one end of the horizontal plate (92) is provided with a limiting plate (93) for limiting the parts of the rectifier.

7. The rectifier assembly equipment according to claim 6, characterized in that, The limiting components on both sides of the first conveyor belt (21) are used to make the geometric center line of each rectifier chip (71) on the first conveyor belt (21) parallel to the conveying direction of the first conveyor belt (21). The limiting components on both sides of the second conveyor belt (31) are also provided, and the limiting components on both sides of the second conveyor belt (31) are used to make the geometric center line of each lower shell (73) on the second conveyor belt (31) parallel to the conveying direction of the second conveyor belt (31). The limiting components on both sides of the third conveyor belt (41) are also provided, and the limiting components on both sides of the third conveyor belt (41) are used to make the geometric center line of each upper shell (76) on the third conveyor belt (41) parallel to the conveying direction of the third conveyor belt (41).

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