Automatic shell closing device

Through the design of the automatic shell-closing device, the automatic assembly of the back shell and the middle frame is realized, which solves the problems of low efficiency, high manual operation intensity and high defect rate in the existing technology, improves assembly efficiency and reduces costs.

CN223368668UActive Publication Date: 2025-09-23GUANGDONG HONGQIN COMM TECH CO LTD
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Patent Information

Application Number
CN202422719154.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-07
Publication Date
2025-09-23
Estimated Expiration
2034-11-07

AI Technical Summary

Technical Problem

The back cover assembly efficiency of existing tablet projects is low and the manual operation intensity is high, resulting in a high rate of failure due to collapse of the middle frame buckles, and difficulty in operating the high-end back cover when plugging in cables.

Method used

An automatic shell assembly device is designed, which includes a frame, a middle frame positioning assembly, a rear shell positioning assembly, a middle frame drive mechanism, left and right downward pressure mechanisms, a rear shell drive mechanism, a pressure holding mechanism and a rolling mechanism. The coordinated work of these components realizes the automatic assembly of the rear shell and the middle frame, and multiple pressure sensors are used to monitor the pressure to ensure precise assembly.

Benefits of technology

It improves assembly efficiency, reduces the defective rate of middle frame buckle collapse, reduces manual operation intensity and cost, and facilitates cable insertion.

✦ Generated by Eureka AI based on patent content.

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Abstract

The automatic shell closing device comprises a rack, a middle frame positioning assembly, a rear shell positioning assembly, a middle frame driving mechanism, a left-right pressing mechanism, a rear shell driving mechanism, a pressure maintaining mechanism and a rolling mechanism, and the middle frame driving mechanism, the left-right pressing mechanism, the rear shell driving mechanism, the pressure maintaining mechanism and the rolling mechanism are installed on the rack. The middle frame positioning assembly is driven by the middle frame driving mechanism to move in the front-back direction of the machine frame, the rear shell positioning assembly is installed at the output end of the rear shell driving mechanism, the rear shell positioning assembly is driven by the rear shell driving mechanism to move and rotate, and the left-right downward pressing mechanisms are located on the two sides of the middle frame driving mechanism. The left-right pressing mechanism is used for pressing one short edge of a workpiece assembled on the middle frame positioning assembly, the pressure maintaining mechanism is used for pressing the other short edge of the workpiece assembled on the middle frame positioning assembly, and the rolling mechanism is used for pressing two opposite long edges of the workpiece assembled on the middle frame positioning assembly. The automatic shell closing device provided by the utility model has the advantages of high automation degree and high working efficiency.
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Description

Technical Field

[0001] The utility model relates to the field of electronic product processing equipment, in particular to an automatic shell closing device. Background Art

[0002] The existing tablet back cover assembly process involves manually snapping together three corners before placing the back cover into a press to press down the final corner. This labor-intensive and inefficient process leads to collapse of the midframe snaps, resulting in a 15.3% defect rate. When high-end back covers require extension cables, manual labor is required to handle both the product and the cable, making the process difficult. A device that can automatically assemble the back cover to the midframe is urgently needed to improve work efficiency. Utility Model Content

[0003] The technical problem solved by the utility model is to provide an automatic shell closing device with high automation degree and high working efficiency.

[0004] The cam is mounted on the frame, and the cam is mounted on the frame to move the cam forward and backward, so that the cam can move relative to the frame when the cam is in a forward and backward direction.

[0005] Preferably, the middle frame driving mechanism includes a forward and backward moving device and a supporting base, the forward and backward moving device is installed on the frame, and the supporting base is installed at the output end of the forward and backward moving device. The supporting base moves along the forward and backward direction of the frame under the drive of the forward and backward moving device, so that the supporting base can switch between the loading station, the assembly station and the pressing station, and the supporting base has a suction cup structure.

[0006] Specifically, the middle frame positioning assembly includes a positioning block lifting device and a positioning block. The positioning block lifting device is installed on the frame. When the supporting base is in the loading station, the positioning block is located at the four corners of the supporting base. The positioning block is installed at the output end of the positioning block lifting device. The positioning block is lifted and lowered by the drive of the positioning block lifting device to position or exit positioning.

[0007] Preferably, the left and right downward pressure mechanisms include a left downward pressure assembly and a right downward pressure assembly, and the left and right downward pressure assemblies are located on both sides of the middle frame driving mechanism. The left and right downward pressure assemblies each include a left and right movable driving device, a pressure head and a pressure head lifting device. The left and right movable driving device is installed on the frame, and the pressure head lifting device is installed at the output end of the left and right movable driving device and moves along the left and right directions of the frame under the drive thereof. The pressure head is installed at the output end of the pressure head lifting device and rises and falls under the drive thereof.

[0008] Specifically, a first pressure sensor for detecting pressure is provided at the pressure head.

[0009] Preferably, the rear shell driving mechanism includes a rear shell lifting driving device, a lifting frame and a rotation driving device, the rear shell lifting driving device is installed on the frame, the lifting frame is installed on the output end of the rear shell lifting driving device, the lifting frame is lifted and lowered by the rear shell lifting driving device, the rotation driving device is connected to the lifting frame, and the rear shell positioning assembly is installed on the output end of the rotation driving device and rotates under its drive.

[0010] Specifically, the rear shell positioning assembly includes a rear shell positioning seat, two side pressing assemblies and an elastic pressure block assembly. The rear shell positioning seat is installed at the output end of the rotation drive device. The rear shell positioning seat has a suction cup structure. The two side pressing assemblies are located on both sides of the rear shell positioning seat and clamp the two sides of the rear shell on the rear shell positioning seat by pressing. The elastic pressure block assembly has a rotating pressure plate for pressing the top surface of the rear shell.

[0011] Specifically, the elastic pressure block assembly also includes a seat body, a rotating shaft and a rotating spring. The seat body is installed on one side of the rear shell positioning seat, the rotating pressure plate is installed on the seat body through the rotating shaft, and the rotating spring is arranged between the rotating pressure plate and the rotating shaft so that the rotating pressure plate is pressed toward the top surface of the rear shell.

[0012] Preferably, the pressure maintaining mechanism includes a lifting drive assembly, a contour pressure head and a second pressure sensor, the lifting drive assembly is installed on the frame, the contour pressure head is installed at the output end of the lifting drive assembly and rises and falls under the drive of the lifting drive assembly, and the second pressure sensor is provided on the contour pressure head.

[0013] Preferably, the rolling mechanism includes a left rolling assembly and a right rolling assembly installed on the frame, and the left rolling assembly and the right rolling assembly each include a rolling lifting device, a rubber-coated roller and a buffer spring. The rubber-coated roller is installed on the output end of the rolling lifting device through the buffer spring. The rubber-coated roller rises and falls under the drive of the rolling lifting device, and the wheel body of the rubber-coated roller is arranged at an angle.

[0014] The utility model provides an automatic shell closing device with the following beneficial effects:

[0015] Compared with the prior art, the frame, the middle frame positioning assembly, the rear shell positioning assembly, the middle frame driving mechanism, the left and right pressing mechanisms, the rear shell driving mechanism, the pressure holding mechanism and the rolling mechanism are combined together; the middle frame positioning assembly is installed at the output end of the middle frame driving mechanism; the middle frame positioning assembly moves along the front and rear directions of the frame under the drive of the middle frame driving mechanism; the rear shell positioning assembly is installed at the output end of the rear shell driving mechanism; the rear shell positioning assembly moves and rotates under the drive of the rear shell driving mechanism; the rear shell on the rear shell positioning assembly is assembled to the middle frame of the middle frame positioning assembly by the movement and rotation of the rear shell positioning assembly; the rotation of the rear shell positioning assembly can achieve a plurality of angles of stay, thereby meeting the operator's action requirements for plugging in the cables and other assembly angles; the left and right pressing mechanisms are located on both sides of the middle frame driving mechanism; the left and right pressing mechanisms are used to press the middle frame positioning assembly The pressure-holding mechanism is used to press one short side of the workpiece assembled on the middle frame positioning component, the pressure-holding mechanism is used to press the other short side of the workpiece assembled on the middle frame positioning component, and the rolling mechanism is used to press the two relatively long sides of the workpiece assembled on the middle frame positioning component, thereby realizing automatic buckling of multiple corners between the back shell and the middle frame. The utility model is simple to operate, frees the operator's hands, and is convenient for the operator to plug in the cables. The back shell is pre-assembled in a USB direction at a certain angle through the rotation and movement of the back shell positioning component to prevent the back shell from being scratched, and then the other three directions are assembled. Among them, multiple pressure sensors are set to monitor the pressure at all times and upload it to the system to achieve accurate and reliable assembly with high efficiency. The automated production process solves the problems of difficult manual operation, high work intensity and low efficiency. It has guiding significance for similar products and processes, reduces the defective rate of middle frame buckle collapse and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of the automatic shell closing device provided by the utility model;

[0017] Figure 2 A top view of the automatic shell closing device provided by the utility model;

[0018] Figure 3 A schematic diagram of the three-dimensional structure of the middle frame driving mechanism and the middle frame positioning assembly of the automatic shell closing device provided by the present invention;

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the left lower pressing component of the automatic shell closing device provided by the utility model;

[0020] Figure 5 A schematic diagram of the three-dimensional structure of the right lower pressing assembly of the automatic shell closing device provided by the present invention;

[0021] Figure 6 A schematic diagram of the three-dimensional structure of the rear shell driving mechanism and the rear shell positioning assembly of the automatic shell closing device provided by the present invention;

[0022] Figure 7 A schematic diagram of the three-dimensional structure of the rolling mechanism and the pressure-holding mechanism of the automatic shell closing device provided by the present invention;

[0023] Figure 8 This is a schematic three-dimensional structural diagram from another angle of the rolling mechanism and the pressure-holding mechanism of the automatic shell closing device provided by the utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0025] Please refer to Figures 1 to 8The automatic shell closing device 100 of the present invention includes a frame 1, a middle frame positioning component 2, a rear shell positioning component 3, a middle frame driving mechanism 4, a left and right pressing mechanism 5, a rear shell driving mechanism 6, a pressure holding mechanism 7 and a rolling mechanism 8. The middle frame driving mechanism 4, the left and right pressing mechanism 5, the rear shell driving mechanism 6, the pressure holding mechanism 7 and the rolling mechanism 8 are installed on the frame 1, the middle frame positioning component 2 is installed at the output end of the middle frame driving mechanism 4, the middle frame positioning component 2 moves along the front and rear direction of the frame 1 under the drive of the middle frame driving mechanism 4, the rear shell positioning component 3 is installed at the output end of the rear shell driving mechanism 6, the rear shell positioning component 3 moves and rotates under the drive of the rear shell driving mechanism 6, and the rear shell on the rear shell positioning component 3 is assembled to the middle frame of the middle frame positioning component 2 by the movement and rotation of the rear shell positioning component 3. The rotation of the rear shell positioning component 3 can also achieve a plurality of angles of stay, thereby meeting the operator's action requirements for plugging in the cable and other assembly angles. The structure 5 is located on both sides of the middle frame driving mechanism 4. The left and right pressing mechanisms 5 are used to press one short side of the workpiece assembled on the middle frame positioning component 2. The pressure holding mechanism 7 is used to press the other short side of the workpiece assembled on the middle frame positioning component 2. The rolling mechanism 8 is used to press the two relatively long sides of the workpiece assembled on the middle frame positioning component 2, thereby realizing the automatic buckling of multiple corners between the back shell and the middle frame. The utility model is simple to operate, frees the operator's hands, and is convenient for the operator to plug in the cable. The back shell is pre-assembled in a certain angle of the USB direction through the rotation and movement of the back shell positioning component 3 to prevent the back shell from being scratched, and then the other three directions are assembled. Among them, by setting up multiple pressure sensors to monitor the pressure at all times and uploading it to the system, accurate and reliable assembly is achieved with high efficiency. The automated production process solves the problems of difficult manual operation, high work intensity and low efficiency. It has guiding significance for similar products and processes, reducing the defective rate of the middle frame buckle collapse and reducing costs. More specifically, as follows:

[0026] Please refer to Figure 3 The middle frame driving mechanism 4 includes a front-to-back moving device 41 and a bearing base 42. The front-to-back moving device 41 is installed on the frame 1, and the bearing base 42 is installed on the output end of the front-to-back moving device 41. The bearing base 42 moves linearly along the front-to-back direction of the frame 1 under the drive of the front-to-back moving device 41, so that the bearing base 42 switches between the loading station, the assembly station and the pressing station (see the loading station status). Figure 3 ), the loading station is located at the starting end of the front-rear moving device 41, the positions of the assembly station and the pressing station are adjusted according to actual conditions, and the supporting base 42 has a suction cup structure 42a.

[0027] Please refer to Figure 3The middle frame positioning assembly 2 includes a positioning block lifting device 21 and a positioning block 22. The positioning block lifting device 21 is installed on the frame 1. When the supporting base 42 is in the loading station, the positioning block 22 is located at the four corners of the supporting base 42. The positioning block 22 is installed at the output end of the positioning block lifting device 21. The positioning block 22 is lifted and lowered by the positioning block lifting device 21 to position or exit positioning.

[0028] Please refer to Figures 4 and 5 The left and right pressing mechanisms 5 include a left pressing assembly 51 and a right pressing assembly 52. ​​The left and right pressing assemblies 51 and 52 are located on either side of the middle frame drive mechanism 4. The left and right pressing assemblies 51 and 52 each include a left and right moving drive device 53, a pressure head 54, and a pressure head lifting device 55. The left and right moving drive device 53 is mounted on the frame 1. The pressure head lifting device 55 is mounted on the output end of the left and right moving drive device 53 and moves along the left and right directions of the frame 1 under the drive of the left and right moving drive device 53. The pressure head 54 is mounted on the output end of the pressure head lifting device 55 and is driven by the pressure head lifting device 55 to rise and fall. Preferably, a first pressure sensor 56 for detecting pressure is provided at the pressure head 54. The first pressure sensor 56 constantly monitors the pressure to achieve accurate and reliable assembly.

[0029] Please refer to Figure 6 The rear shell driving mechanism 6 includes a rear shell lifting driving device 61, a lifting frame 62 and a rotating driving device 63. The rear shell lifting driving device 61 is installed on the frame 1, and the lifting frame 62 is installed at the output end of the rear shell lifting driving device 61. The lifting frame 62 is lifted and lowered under the drive of the rear shell lifting driving device 61. The rotating driving device 63 is connected to the lifting frame 62. The rear shell positioning assembly 3 is installed at the output end of the rotating driving device 63 and rotates under its drive, so that the rear shell positioning assembly 3 rotates to the target position according to actual conditions to meet the needs of manual assembly and automatic assembly.

[0030] Please refer to Figure 6 The rear shell positioning assembly 3 includes a rear shell positioning seat 31, two side pressing assemblies 32 and an elastic pressure block assembly 33. The rear shell positioning seat 31 is installed at the output end of the rotation drive device 63. The rear shell positioning seat 31 has a suction cup structure 31a. The suction cup structure 31a positions the workpiece by adsorption. The two side pressing assemblies 32 are located on both sides of the rear shell positioning seat 31 and clamp the two sides of the rear shell on the rear shell positioning seat 31 by pressing.

[0031] Please refer to Figure 6The elastic pressure block assembly 33 includes a rotating pressure plate 331, a base 332, a rotating shaft 333, and a rotating spring 334. The rotating pressure plate 331 is used to press the top surface of the rear housing. The base 332 is mounted on one side of the rear housing positioning base 31. The rotating pressure plate 331 is mounted on the base 332 via the rotating shaft 333. The rotating spring 334 is disposed between the rotating pressure plate 331 and the rotating shaft 333 to press the rotating pressure plate 331 against the top surface of the rear housing. The rotating spring 334 provides a constant elastic force that presses the rotating pressure plate 331 against the rear housing.

[0032] Please refer to Figure 8 The pressure maintaining mechanism 7 includes a lifting drive assembly 71, a profiling pressure head 72 and a second pressure sensor 73. The lifting drive assembly 71 is installed on the frame 1, the profiling pressure head 72 is installed at the output end of the lifting drive assembly 71 and is driven to rise and fall. The second pressure sensor 73 is provided on the profiling pressure head 72. The second pressure sensor 73 monitors the pressure at all times to achieve accurate and reliable assembly.

[0033] Please refer to Figure 7 The rolling mechanism 8 includes a left rolling assembly 81 and a right rolling assembly 82 installed on the frame 1. The left rolling assembly 81 and the right rolling assembly 82 each include a rolling lifting device 83, a rubber-coated roller 84 and a buffer spring 85. The rubber-coated roller 84 is installed on the output end of the rolling lifting device 83 through the buffer spring 85. The rubber-coated roller 84 rises and falls under the drive of the rolling lifting device 83. The wheel body of the rubber-coated roller 84 is tilted, and the buffer spring 85 plays a buffering role.

[0034] Please refer to the following: Figures 1 to 8 The working process of the automatic shell closing device 100 of the present invention is as follows:

[0035] 1. The operator places the middle frame into the supporting base 42 and the rear cover into the rear cover positioning seat 31 of the rear cover positioning assembly 3;

[0036] 2. The device detects the middle frame and back cover and automatically activates vacuum suction to hold both the back cover and the middle frame in place.

[0037] 3. Press the start button with both hands and the equipment will run automatically;

[0038] 4. The positioning block 22 is in the raised position to position the four corners of the middle frame. After the middle frame is positioned, the positioning block 22 is lowered by the positioning block lifting device 21. The supporting base 42 is moved to the assembly station by the front and rear moving device 41. The rear shell positioning component 3 is rotated by the rotation drive device 63, so that the rear shell positioning component 3 rotates to a certain angle according to the actual situation. The equipment is paused, and the operator plugs in the cable. After OK, the equipment is started again.

[0039] 5. The rotation drive device 63 and the rear shell lifting drive device 61 cooperate with each other, and the rear shell is automatically assembled at a certain angle under the combined action. At this time, the rear shell is assembled to the middle frame, and the rear shell drive mechanism 6 is withdrawn.

[0040] 6. The left lower pressing assembly 51 and the right lower pressing assembly 52 press the short sides of the assembled middle frame and rear shell, then the rolling mechanism 8 presses the two long sides of the assembled middle frame and rear shell, and the pressure holding mechanism 7 presses the other short side of the assembled middle frame and rear shell.

[0041] 7. After everything is completed, the assembled middle frame and back shell return to the loading station.

[0042] 8. Manually take out the product and enter the next cycle.

[0043] By combining the frame 1, the middle frame positioning assembly 2, the rear shell positioning assembly 3, the middle frame driving mechanism 4, the left and right pressing mechanisms 5, the rear shell driving mechanism 6, the pressure holding mechanism 7 and the rolling mechanism 8, the middle frame positioning assembly 2 is installed at the output end of the middle frame driving mechanism 4, and the middle frame positioning assembly 2 moves along the front and rear direction of the frame 1 under the drive of the middle frame driving mechanism 4, and the rear shell positioning assembly 3 is installed at the output end of the rear shell driving mechanism 6. The rear shell positioning assembly 3 moves and rotates under the drive of the rear shell driving mechanism 6, and the rear shell on the rear shell positioning assembly 3 is assembled to the middle frame of the middle frame positioning assembly 2 by the movement and rotation of the rear shell positioning assembly 3. The rotation of the rear shell positioning assembly 3 can achieve a plurality of angles of stay, thereby meeting the operator's action requirements for plugging in the cables and other assembly angles. The left and right pressing mechanisms 5 are located on both sides of the middle frame driving mechanism 4, and the left and right pressing mechanisms 5 are used for pressing The middle frame positioning component 2 is used to press one short side of the workpiece assembled on the middle frame positioning component 2, and the pressure holding mechanism 7 is used to press the other short side of the workpiece assembled on the middle frame positioning component 2. The rolling mechanism 8 is used to press the two relatively long sides of the workpiece assembled on the middle frame positioning component 2, thereby realizing automatic buckling of multiple corners between the back shell and the middle frame. The utility model is simple to operate, frees the operator's hands, and is convenient for the operator to plug in the cables. The back shell is pre-assembled in a USB direction at a certain angle through the rotation and movement of the back shell positioning component 3 to prevent the back shell from being scratched, and then the other three directions are assembled. Among them, by setting multiple pressure sensors to monitor the pressure at all times and uploading it to the system, accurate and reliable assembly is achieved with high efficiency. The automated production process solves the problems of difficult manual operation, high work intensity and low efficiency. It has guiding significance for similar products and processes, reduces the defective rate of middle frame buckle collapse and reduces costs.

[0044] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An automatic shell closing device, characterized in that: The camshaft is mounted on the support frame of the machine base and is adapted to move the camshaft to the support frame so as to allow the camshaft to move forward and backward relative to the support frame.

2. The automatic shell closing device according to claim 1, characterized in that: The middle frame driving mechanism includes a forward and backward moving device and a supporting base. The forward and backward moving device is installed on the frame, and the supporting base is installed at the output end of the forward and backward moving device. The supporting base moves along the forward and backward direction of the frame under the drive of the forward and backward moving device, so that the supporting base can switch between the loading station, the assembly station and the pressing station. The supporting base has a suction cup structure.

3. The automatic shell closing device according to claim 2, characterized in that: The middle frame positioning assembly includes a positioning block lifting device and a positioning block. The positioning block lifting device is installed on the frame. When the supporting base is in the loading station, the positioning blocks are located at the four corners of the supporting base. The positioning blocks are installed at the output end of the positioning block lifting device. The positioning blocks are lifted and lowered by the driving of the positioning block lifting device to position or exit positioning.

4. The automatic shell closing device according to claim 1, characterized in that: The left and right pressing mechanisms include a left pressing assembly and a right pressing assembly, and the left and right pressing assemblies are located on both sides of the middle frame driving mechanism. The left and right pressing assemblies each include a left and right moving driving device, a pressure head and a pressure head lifting device. The left and right moving driving device is installed on the frame, and the pressure head lifting device is installed at the output end of the left and right moving driving device and moves along the left and right directions of the frame under the drive thereof. The pressure head is installed at the output end of the pressure head lifting device and rises and falls under the drive thereof.

5. The automatic shell closing device according to claim 4, characterized in that: The pressure head is provided with a first pressure sensor for detecting pressure.

6. The automatic shell closing device according to claim 1, characterized in that: The rear shell driving mechanism includes a rear shell lifting driving device, a lifting frame and a rotation driving device. The rear shell lifting driving device is installed on the frame, and the lifting frame is installed on the output end of the rear shell lifting driving device. The lifting frame is lifted and lowered under the drive of the rear shell lifting driving device. The rotation driving device is connected to the lifting frame. The rear shell positioning assembly is installed on the output end of the rotation driving device and rotates under its drive.

7. The automatic shell closing device according to claim 6, characterized in that: The rear shell positioning assembly includes a rear shell positioning seat, two side pressing assemblies and an elastic pressure block assembly. The rear shell positioning seat is installed at the output end of the rotation drive device. The rear shell positioning seat has a suction cup structure. The two side pressing assemblies are located on both sides of the rear shell positioning seat and clamp the two sides of the rear shell on the rear shell positioning seat by pressing. The elastic pressure block assembly has a rotating pressure plate for pressing the top surface of the rear shell.

8. The automatic shell closing device according to claim 7, characterized in that: The elastic pressure block assembly also includes a seat body, a rotating shaft and a rotating spring. The seat body is installed on one side of the rear shell positioning seat, the rotating pressure plate is installed on the seat body through the rotating shaft, and the rotating spring is arranged between the rotating pressure plate and the rotating shaft so that the rotating pressure plate is pressed toward the top surface of the rear shell.

9. The automatic shell closing device according to claim 1, characterized in that: The pressure maintaining mechanism includes a lifting drive component, a contour pressure head and a second pressure sensor. The lifting drive component is installed on the frame. The contour pressure head is installed at the output end of the lifting drive component and rises and falls under the drive of the lifting drive component. The second pressure sensor is provided on the contour pressure head.

10. The automatic shell closing device according to claim 1, characterized in that: The rolling mechanism includes a left rolling assembly and a right rolling assembly installed on the frame. The left rolling assembly and the right rolling assembly each include a rolling lifting device, a rubber-coated roller and a buffer spring. The rubber-coated roller is installed on the output end of the rolling lifting device through the buffer spring. The rubber-coated roller rises and falls under the drive of the rolling lifting device, and the wheel body of the rubber-coated roller is arranged at an angle.