Automatic screwing robot for 4G flip phone production

Abstract

This invention discloses an automatic screw-on robot for 4G flip phone production, relating to the field of automatic screw-on robot technology. It includes a worktable and a lower shaft plate, the lower shaft plate being disposed on the surface of the worktable, and an upper shaft plate also disposed on the worktable surface. Four electric screwdrivers are disposed on the top of the upper shaft plate, each with a screwdriver rod at its output end. Four connectors are disposed at the bottom of the lower shaft plate, each connector having a tightening rod on its inner wall. The output end of the electric screwdriver rotates and transmits power to the tightening rods via the screwdriver rods, causing the tightening rods to rotate and tighten the screws into the screw holes. By rotating the electric screwdrivers within a circular frame, the circular frame, which was originally rigidly connected to the upper shaft plate, is given a degree of freedom in the horizontal direction of rotation. Each electric screwdriver is not directly rigidly connected to the upper shaft plate, avoiding misjudgment by the torque sensor inside a certain electric screwdriver due to impact from screw tightening in other locations, which could lead to under-tightening or insufficient tightening of subsequent screws.

Description

Technical Field

[0001] This invention belongs to the field of automatic screw-on robots, specifically relating to an automatic screw-on robot for the production of 4G flip phones. Background Technology

[0002] Multi-axis automatic screw tightening equipment can replace manual screw tightening, resulting in high production efficiency and a significant increase in the number of products produced per unit time.

[0003] Patent publication number CN206105345U relates to an automatic screw fastening machine. The automatic screw fastening machine includes a support frame, a cylinder fixed to the support frame, an upper and lower fixed plate spaced apart and fixed to the support frame and pushed vertically by the cylinder, multiple electric screwdrivers fixed to the upper fixed plate, a universal joint connected to each electric screwdriver, and a screw clamping device connected to the other end of the universal joint. The screw clamping device includes a connecting rod, a screw chuck connected to the other end of the connecting rod relative to the universal joint, a screw conduit communicating with the screw chuck, and a connecting plate fixedly connected to the lower fixed plate. The connecting plate has grooves matching the number of electric screwdrivers, and the connecting rod passes through and slides along the grooves. This patent provides an automatic screw fastening machine that can fasten multiple screws at once, resulting in high work efficiency.

[0004] In the aforementioned patent, the electric screwdriver is rigidly fixed to the upper fixing plate. During multi-axis tightening, when a certain connecting rod tightens the screw into place, it will generate an instantaneous impact. The vibration generated by the impact can easily be transmitted to other electric screwdrivers through the rigid upper fixing plate. After detecting the transient impact, the torque sensor inside the electric screwdriver will mistakenly judge it as tightened and stop turning prematurely. This can easily lead to subsequent screws being under-tightened or under-tightened. Moreover, due to the manufacturing error of the mobile phone shell, there are slight differences in the shape and depth of each screw hole. All screws are prone to tightening time difference, making it difficult to tighten them at the same time. Tightening time difference can easily cause the screw that is tightened first to pull the surface of the shell locally towards the screw hole, causing a slight deformation of the surface of the mobile phone shell. The screw that is tightened later is forcibly locked in the shell under a slightly deformed state, causing uneven stress on the surface of the mobile phone shell and subsequent warping deformation. Summary of the Invention

[0005] The purpose of this invention is to solve at least one of the problems in the prior art mentioned above, and to provide an automatic screw-on robot for the production of 4G flip phones.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An automatic screw-on robot for 4G flip phone production includes: a workbench and a lower shaft plate. The lower shaft plate is disposed on the surface of the workbench, and an upper shaft plate is also disposed on the surface of the workbench. Four electric screwdrivers are disposed on the top of the upper shaft plate, and screwdriver rods are disposed on the output ends of the electric screwdrivers. Four connectors are disposed on the bottom of the lower shaft plate, and tightening rods are disposed on the inner walls of the connectors. The output ends of the electric screwdrivers rotate and transmit power to the tightening rods through the screwdriver rods, causing the tightening rods to rotate and tighten the screws into the screw holes. The top of the tightening rods is connected to the bottom of the screwdriver rods. The lower shaft plate, the upper shaft plate, and the electric screwdrivers are connected to a control device. The control device controls the operation of the lower shaft plate, the upper shaft plate, and the electric screwdrivers through preset operating parameters. A bracket is fixedly installed on the top of the upper shaft plate near the electric screwdrivers. A circular frame is slidably installed on the top of the bracket. The electric screwdrivers are rotatably mounted on the inner wall of the circular frame. By rotating the electric screwdrivers onto the circular frame, the circular frame, which is originally rigidly connected to the upper shaft plate, is given a horizontal rotation direction. The electric screwdriver has a certain degree of freedom. A first spring is provided between the circular frame and the bracket, and a first torsion spring is provided between the electric screwdriver and the circular frame. By sliding the circular frame on the top of the bracket, the electric screwdriver is provided with longitudinal freedom of movement. The electric screwdriver is not rigidly limited in the longitudinal direction. A sliding frame is slidably installed on the outer wall of the circular frame. A first limiting hole is opened on the outer wall of the electric screwdriver. A large plug is fixedly installed on the top of the sliding frame. The large plug fits against the inner wall of the first limiting hole. The horizontal rotational freedom of the electric screwdriver is temporarily restricted by the large plug in the first limiting hole. A sliding rod is slidably installed on the surface of the upper shaft plate. The top of the sliding rod is fixedly connected to the sliding frame. A roller is rotatably installed on the rear side of the sliding rod. Stops are rotatably installed on both sides of the worktable. After the sliding rod slides, it drives the large plug to move and disengage from the first limiting hole, releasing the restriction of the electric screwdriver by the circular frame. At this time, the horizontal rotational freedom of the electric screwdriver is released, providing a buffer space for the impact force generated when tightening screws.

[0007] Furthermore, a mold is installed on the surface of the workbench, a second limiting hole is opened on the surface of the bracket, a fixing rod is fixed at the bottom of the circular frame, the circular frame slides with the bracket through the fixing rod, a small insert is slidably installed on the bracket on one side of the second limiting hole, a diagonal rod is hinged to the side of the small insert near the sliding frame, the end of the diagonal rod near the sliding frame is hinged to the sliding frame, the sliding frame pushes the diagonal rod to deflect, a stop bar is fixedly installed on the surface of the sliding frame on the side near the diagonal rod, after the diagonal rod deflects, it pushes the small insert to slide into the second limiting hole, and enters the second limiting hole to limit the circular frame in the longitudinal direction by pressing against the fixing rod, thus limiting the longitudinal freedom of the electric screwdriver during the screw tightening process.

[0008] Furthermore, a second spring is provided between the sliding frame and the circular frame, and the elastic force of the second spring causes the sliding frame to return to its original position. A third spring is provided between the small insert rod and the bracket, and the elastic force of the third spring causes the small insert rod to return to its original position.

[0009] Furthermore, an elastic telescopic rod is fixedly installed at the bottom of the lower shaft plate. As the lower shaft plate continues to move downward, it compresses the elastic telescopic rod. A pressure plate is fixedly installed at the free end of the elastic telescopic rod. When the elastic telescopic rod is compressed, it exerts pressure on the pressure plate, causing the pressure plate to press the phone casing tightly. The pressure plate and the mold provide omnidirectional positioning and fixation for the phone casing. The top of the stop block has a sloping area and a flat area. A vertical rod is fixedly installed at the bottom of the stop block. A groove is provided at the intersection of the lower shaft plate and the vertical rod. When the stop block rotates due to the pressure of the rollers on the sloping area at the top, it drives the vertical rod to rotate. A rod passes through a sliding groove and an arc strip is fixedly installed at its bottom. An arc groove is formed on the surface of the arc strip. A retaining strip is slidably installed on the surface of the worktable near the arc strip. A matching rod is fixedly installed on the top of the retaining strip. The matching rod slides in cooperation with the arc groove. When the vertical rod rotates, it drives the arc strip to rotate. A pressure block is slidably installed on the outer wall of the free end of the elastic telescopic rod. The arc strip pushes the retaining strip to move towards the pressure block. A compression spring is provided between the pressure block and the pressure plate. A side groove is formed on the side of the pressure block near the retaining strip. The retaining strip enters the side groove to limit the pressure block, so that the pressure block continuously squeezes the compression spring and makes the pressure plate cover the mobile phone shell tightly.

[0010] Furthermore, an elastic element is provided between the mating rod and the arc groove. The arc strip is supported by the elastic element, pushing the locking strip into the side groove. A ratchet is fixedly installed on the front side of the roller. A pawl is rotatably installed on the surface of the slide rod near the ratchet, so that the roller can only rotate in one direction. When the upper shaft plate resets upward and drives the roller to reset upward, the roller surface will not roll when it rubs against the inclined area of ​​the top of the stop block which is resetting at the same time, thus increasing the friction between the roller and the stop block. A second torsion spring is provided between the stop block and the worktable. The stop block resets under the elastic force of the second torsion spring.

[0011] Furthermore, a sliding plate is slidably installed on the inner wall of the mold. When the mobile phone casing is placed into the mold, it will squeeze the sliding plate downward. A protruding rod is fixedly installed on the surface of the sliding plate. After the sliding plate slides, it drives the protruding rod to slide. A vertical groove is opened on the surface of the mold, and the protruding rod passes through the vertical groove. A hook is slidably installed on the front side of the mold. The hook is reset under the elastic force of the fifth spring, limiting the protruding rod and limiting the sliding sliding plate. An inclined surface is provided on the top of the hook. A pressure rod is slidably installed on the front side of the mold. An inclined surface is provided near the pressure rod of the hook. After the pressure rod moves, it squeezes the inclined surface of the hook surface and pushes the hook to move again. A fourth spring is provided between the sliding plate and the mold. The elastic force of the fourth spring resets the sliding plate. A fifth spring is provided between the hook and the mold. The hook is reset under the elastic force of the fifth spring.

[0012] Furthermore, a rotating plate is rotatably mounted on the inner wall of the skateboard, and a rotating shaft is fixedly mounted on the rear side of the rotating plate. The rotating shaft passes through the surface of the skateboard. A rack is fixedly mounted on the inner wall of the mold near the rotating shaft. A gear is fixedly mounted on one end of the rotating shaft near the rack. After the gear moves, it contacts and meshes with the rack. The rack's reaction force on the gear drives the gear to rotate, and the rotated gear drives the rotating plate to rotate.

[0013] Furthermore, a third torsion spring is provided between the rotating plate and the sliding plate. The elastic force of the third torsion spring resets the rotating plate and provides support for the rotating plate. A reset spring is provided between the pressure rod and the mold. The elastic force of the reset spring resets the pressure rod.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, by rotating an electric screwdriver in a circular frame, gives the circular frame, which was originally rigidly connected to the upper shaft plate, a degree of freedom in the horizontal direction of rotation. Each electric screwdriver is not directly rigidly connected to the upper shaft plate, but rather moves independently with the upper shaft plate through the circular frame. The electric screwdriver is supported and the impact force is mitigated by a first torsion spring. Each electric screwdriver and the tightening rod are mechanically and dynamically decoupled. The impact of one tightening rod does not affect the torque judgment of electric screwdrivers in other positions, avoiding misjudgment by the torque sensor inside an electric screwdriver in a certain position due to the impact of screw tightening in other positions, which would lead to subsequent screws being under-tightened or under-tightened.

[0015] 2. This invention not only provides the electric screwdriver with a horizontal rotational degree of freedom by setting a circular frame, but also provides the electric screwdriver with a longitudinal degree of freedom by sliding the circular frame on the top of the bracket. This avoids a strong longitudinal impact on the electric screwdriver caused by the instantaneous contact between the screw and the screw hole. Furthermore, the elastic force of the first spring buffers the longitudinal impact force, further preventing the instantaneous impact on the tightening rod from being transmitted to the electric screwdriver surface in other positions through the upper shaft plate. By giving the electric screwdriver a degree of freedom in both the longitudinal and horizontal rotational directions, it can not only significantly reduce the vibration and impact on the electric screwdriver, but also allow the two degrees of freedom to be turned on and off in a timely manner according to the operating stage of the equipment.

[0016] 3. This invention uses a pressure plate and a mold to limit and fix the mobile phone casing in all directions, eliminating the path of local deformation of the mobile phone casing. It avoids the problem of screws being tightened at different times, which would cause the screws to be tightened later when the casing is already slightly deformed, resulting in uneven stress on the surface of the mobile phone casing. This also prevents the mobile phone casing from deforming further due to uneven surface stress, which would affect the normal use of the mobile phone.

[0017] 4. This invention limits the pressure block by using a locking strip, causing the pressure block to continuously compress the spring and tighten the pressure plate over the phone casing. This ensures that the phone casing will not undergo minor deformation during the screw tightening process. At the same time, after the screw is tightened, the pressure block will delay its reset, allowing the pressure plate to continue to compress the screwed phone casing for a period of time to stabilize the residual stress on the surface of the phone casing before the phone casing can be removed from the mold. Furthermore, by utilizing the unidirectional rotation property of the roller, the friction between the roller and the stop block is increased during the reset, causing the stop block to reset slowly and further extending the compression time of the pressure plate on the phone casing.

[0018] 5. This invention uses a sliding plate that springs upward under the force of a fourth spring to automatically lift the phone case from the mold, making it easier for workers to remove the phone case and improving work efficiency. Moreover, when the sliding plate is lifted, it drives the rotating plate to rotate. After the rotating plate rotates and tilts, it pours out the debris generated by the friction between the screws on the surface of the phone case when they are tightened, ensuring that the surfaces of the sliding plate and the rotating plate are always flat, ensuring that the phone case fits snugly and does not tilt when placed in the mold. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the electric screwdriver used in this invention; Figure 3 This is a schematic diagram of the slide bar in this invention; Figure 4 This is a schematic diagram of the circular frame in this invention; Figure 5 This is a schematic diagram of the second limiting hole in the present invention; Figure 6 For the present invention Figure 5 Enlarged view of section A in the middle; Figure 7 This is a schematic diagram of the roller in this invention; Figure 8 This is a schematic diagram of the pressure block in the present invention; Figure 9 This is a schematic diagram of the card strip in this invention; Figure 10 This is a schematic diagram of the skateboard in this invention; Figure 11 This is a schematic diagram of the transfer plate in this invention.

[0020] Figure label: 1. Workbench; 2. Lower shaft plate; 3. Upper shaft plate; 4. Electric screwdriver; 5. Screwdriver handle; 6. Connector; 7. Tightening rod; 8. Mold; 91. Circular frame; 92. Support; 93. No. 1 limiting hole; 94. Sliding frame; 95. Large insert rod; 96. Sliding rod; 97. Roller; 98. Stop block; 99. No. 2 limiting hole; 910. Small insert rod; 911. Diagonal rod; 912. Stop bar; 101. Pressing rod. 102. Plate; 103. Elastic telescopic rod; 104. Pressure block; 105. Compression spring; 106. Vertical rod; 107. Arc strip; 108. Locking strip; 109. Matching rod; 110. Arc groove; 1011. Pawl; 1012. Ratchet; 1101. Slide plate; 1102. Protruding rod; 1103. Hook; 1104. Pressure rod; 1105. Turning plate; 1106. Gear; 1107. Rack. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0022] like Figures 1 to 11As shown in this embodiment, an automatic screw-on robot for 4G flip phone production includes: a workbench 1 and a lower shaft plate 2. The lower shaft plate 2 is disposed on the surface of the workbench 1, and an upper shaft plate 3 is also disposed on the surface of the workbench 1. Four electric screwdrivers 4 are disposed on the top of the upper shaft plate 3, and screwdriver rods 5 are disposed on the output ends of the electric screwdrivers 4. Four connectors 6 are disposed on the bottom of the lower shaft plate 2, and tightening rods 7 are disposed on the inner walls of the connectors 6. The output ends of the electric screwdrivers 4 rotate and transmit power to the tightening rods 7 through the screwdriver rods 5, causing the tightening rods 7 to rotate and tighten the screws into the screw holes. The top of the tightening rods 7 is connected to the bottom of the screwdriver rods 5. The lower shaft plate 2, the upper shaft plate 3, and the electric screwdrivers 4 are connected to a control device. The control device controls the operation of the screwdrivers 4 by setting preset operating parameters. The operation of the lower shaft plate 2, upper shaft plate 3, and electric screwdriver 4 is controlled. A bracket 92 is fixedly installed on the top of the upper shaft plate 3 near the electric screwdriver 4. A circular frame 91 is slidably installed on the top of the bracket 92. The electric screwdriver 4 is rotatably mounted on the inner wall of the circular frame 91. By rotatably mounting the electric screwdriver 4 in the circular frame 91, the circular frame 91, which was originally rigidly connected to the upper shaft plate 3, is given a degree of freedom in the horizontal direction of rotation. Each electric screwdriver 4 is not directly rigidly connected to the upper shaft plate 3, but rather independently moves and cooperates with the upper shaft plate 3 through the circular frame 91. This avoids misjudgment caused by the impact of tightening screws in other locations on the torque sensor inside the electric screwdriver 4, leading to under-tightening or under-tightening of subsequent screws. A [missing information - likely a design feature or design] is provided between the circular frame 91 and the bracket 92. A first torsion spring is provided between the electric screwdriver 4 and the circular frame 91. By sliding the circular frame 91 on the top of the bracket 92, it provides longitudinal freedom of movement for the electric screwdriver 4. The electric screwdriver 4 is not rigidly limited in the longitudinal direction, and the elastic force of the first spring buffers the impact force generated in the longitudinal direction, further preventing the instantaneous impact of the tightening rod 7 from being transmitted to the surface of the electric screwdriver 4 in other positions through the upper shaft plate 3. A sliding frame 94 is slidably installed on the outer wall of the circular frame 91. A first limiting hole 93 is opened on the outer wall of the electric screwdriver 4. A large insertion rod 95 is fixedly installed on the top of the sliding frame 94. The large insertion rod 95 fits against the inner wall of the first limiting hole 93. The horizontal rotational freedom of the electric screwdriver 4 is temporarily restricted to ensure that the vibration generated by the mechanical friction between the lower shaft plate 2 and the worktable 1 during the descent will not cause the electric screwdriver 4 and the connector 6 to wobble or become misaligned, and to ensure that the connector 6 can smoothly align with the screw hole. A slide rod 96 is slidably installed on the surface of the upper shaft plate 3. The top of the slide rod 96 is fixedly connected to the slide frame 94. A roller 97 is rotatably installed on the rear side of the slide rod 96. Stops 98 are rotatably installed on both sides of the worktable 1. After the slide rod 96 slides, it drives the large insertion rod 95 to move and disengage from the first limiting hole 93, releasing the restriction of the electric screwdriver 4 by the round frame 91. At this time, the horizontal rotational freedom of the electric screwdriver 4 is released, providing a buffer space for the impact force generated when tightening screws later.

[0023] A mold 8 is mounted on the surface of the workbench 1. A second limiting hole 99 is opened on the surface of the support 92. A fixing rod is fixed to the bottom of the circular frame 91. The circular frame 91 slides with the support 92 through the fixing rod. A small insert rod 910 is slidably mounted on the support 92 on one side of the second limiting hole 99. A diagonal rod 911 is hinged to the side of the small insert rod 910 near the sliding frame 94. The end of the diagonal rod 911 near the sliding frame 94 is hinged to the sliding frame 94. The sliding frame 94 pushes the diagonal rod 911 to deflect. The surface of the sliding frame 94 is close to the diagonal rod 911. A stop bar 912 is fixedly installed on one side. After the diagonal bar 911 deflects, it pushes the small insert rod 910 to slide into the second limiting hole 99. Once in the second limiting hole 99, it presses against the fixing rod to limit the longitudinal position of the circular frame 91, thus restricting the longitudinal degree of freedom of the electric screwdriver 4 during screw tightening. By giving the electric screwdriver 4 the degree of freedom in both longitudinal and horizontal rotation directions, it can not only significantly reduce the vibration and impact on the electric screwdriver 4, but also allow the two degrees of freedom to be turned on and off in a timely manner according to the equipment operation stage.

[0024] A second spring is provided between the sliding frame 94 and the circular frame 91. The elastic force of the second spring causes the sliding frame 94 to return to its original position. A third spring is provided between the small insert rod 910 and the bracket 92. The elastic force of the third spring causes the small insert rod 910 to return to its original position.

[0025] In this embodiment, the control device controls the operation of the lower shaft plate 2, upper shaft plate 3, and electric screwdriver 4 through preset operating parameters. The flip phone casing is placed in the working area of ​​the connector 6, ready to automatically install the screws on the phone casing. In the screw-installing process, the upper shaft plate 3 has two movement stages. In the first stage, the upper shaft plate 3 and the lower shaft plate 2 move downwards simultaneously, causing the connector 6 to align with the screw holes on the surface of the phone casing. After the connector 6 is aligned with the casing, the lower shaft plate 2 remains unchanged, and the upper shaft plate 3 begins the second stage of movement. The upper shaft plate 3 continues to move a certain distance, pushing the tightening rod 7 to slide inside the connector 6, pushing the screw stored inside the connector 6 into the screw hole of the phone casing. At this time, the electric screwdriver 4 starts to operate. The output end of the electric screwdriver 4 rotates and transmits power to the tightening rod 7 through the screwdriver rod 5, causing the tightening rod 7 to rotate and tighten the screw in the screw hole, completing the automatic screw tightening. In existing multi-axis automatic screw tightening equipment, each tightening rod 7 relies on an independent electric screwdriver 4 to transmit power. However, due to manufacturing errors, the shape and depth of the screw holes in mobile phone casings vary slightly. Although all electric screwdrivers 4 start simultaneously, the time it takes for each tightening rod 7 to reach the target torque differs by milliseconds. When a tightening rod 7 tightens the screw first, an impact vibration is generated the moment the screw is fully tightened in the screw hole. This vibration is transmitted through the upper shaft plate 3 to the other tightening rods 7 that are tightening. The torque sensor inside the corresponding electric screwdriver 4 detects the transient impact and mistakenly judges that the tightening rod 7 has already tightened the screw, causing it to stop prematurely, resulting in the screw... To prevent under-tightening of screws, the electric screwdriver 4 is rotated and installed in the circular frame 91, giving the circular frame 91, which was originally rigidly connected to the upper shaft plate 3, a degree of freedom in the horizontal rotation direction. Each electric screwdriver 4 is not directly rigidly connected to the upper shaft plate 3, but rather independently moves and cooperates with the upper shaft plate 3 through the circular frame 91. The electric screwdriver 4 is supported and the impact force is mitigated by the first torsion spring. Each electric screwdriver 4 and the tightening rod 7 are mechanically and dynamically decoupled. The impact of one tightening rod 7 does not affect the torque judgment of electric screwdriver 4 at other positions, avoiding misjudgment by the torque sensor inside an electric screwdriver 4 due to the impact of screw tightening at other positions, which would lead to subsequent under-tightening of screws.

[0026] This invention not only provides the electric screwdriver 4 with a horizontal rotational degree of freedom by setting the circular frame 91, but also provides the electric screwdriver 4 with a longitudinal movement degree of freedom by sliding the circular frame 91 on the top of the bracket 92. This is because when the upper shaft plate 3 moves in the second stage, the sudden contact and collision between the screw and the screw hole when pushing the tightening rod 7 to tighten the screw will also cause an impact force on the surface of the tightening rod 7. The electric screwdriver 4 is not rigidly limited in the longitudinal direction, and the impact force generated in the longitudinal direction is buffered by the elastic force of the first spring, thus preventing the instantaneous impact on the tightening rod 7 from being transmitted to the surface of the electric screwdriver 4 in other positions through the upper shaft plate 3.

[0027] Before the lower shaft plate 2 drives the connector 6 to align with the screw hole, the large insertion rod 95 temporarily restricts the horizontal rotational freedom of the electric screwdriver 4 in the first limiting hole 93. This ensures that the vibration generated by the mechanical friction between the lower shaft plate 2 and the worktable 1 during the descent will not cause the electric screwdriver 4 and the connector 6 to shake or become misaligned, thus ensuring that the connector 6 can smoothly align with the screw hole. When the connector 6 is fully connected and the upper shaft plate 3 begins its second stage of movement, the movement of the upper shaft plate 3 causes the slide rod 96 to move downwards. After the slide rod 96 moves, it causes the roller 97 to contact the stop block 98. The roller 97 presses against the inclined area at the top of the stop block 98, pushing the stop block 98 to rotate. After the stop block 98 rotates, it causes the top flat area to rotate. The rotated flat area limits the roller 97, stopping the slide rod 96 from moving downwards. As the upper shaft plate 3 continues to move downwards, it compresses the slide rod 96 to slide on the surface of the upper shaft plate 3. After the slide rod 96 slides, it causes the large insertion rod 95 to move and disengage from the first limiting hole 93, releasing the limitation of the circular frame 91 on the electric screwdriver 4. At this time, the horizontal rotational freedom of the electric screwdriver 4 is released, providing a buffer space for the impact force generated when tightening screws later. As the sliding frame 94 drives the large insertion rod 95 away from the first limiting hole 93, the sliding frame 94 pushes the inclined rod 911 to deflect. After the inclined rod 911 deflects, it pushes the small insertion rod 910 to slide into the second limiting hole 99. At the same time, the inclined rod 911 also comes into contact with the top of the stop bar 912 and is blocked by the stop bar 912, so it no longer deflects. Together with the small insertion rod 910 entering the second limiting hole 99, they form an integral limiting structure. Entering the second limiting hole 99, the circular frame 91 is limited in the longitudinal direction by pressing against the fixing rod, which restricts the longitudinal degree of freedom of the electric screwdriver 4 during the screw tightening process. By giving the electric screwdriver 4 the degree of freedom in the longitudinal and horizontal rotation directions, not only can the vibration and impact on the electric screwdriver 4 be significantly reduced, but the degree of freedom in both directions can also be turned on and off in a timely manner according to the equipment operation stage. Example

[0028] like Figures 1 to 11As shown, this embodiment of an automatic screw-on robot for 4G flip phone production includes all the technical features of embodiment 1. In addition, an elastic telescopic rod 102 is fixedly installed at the bottom of the lower shaft plate 2. The lower shaft plate 2 continues to move downward, squeezing the elastic telescopic rod 102. A pressure plate 101 is fixedly installed at the free end of the elastic telescopic rod 102. After being pressed, the elastic telescopic rod 102 exerts pressure on the pressure plate 101, causing the pressure plate 101 to press the phone shell tightly. The pressure plate 101 and the mold 8 limit and fix the phone shell in all directions, eliminating the local deformation path of the phone shell and avoiding the screw tightening sequence difference, which causes the screw to be forcibly locked in the state of slight deformation of the shell, resulting in uneven stress on the surface of the phone shell. The top of the stop block 98 is provided with a sloping area and a flat area. A vertical rod 106 is fixedly installed at the bottom of the stop block 98. A groove is opened at the intersection of the lower shaft plate 2 and the vertical rod 106. Moreover, the stop block 98 is subjected to pressure from the sloping area at the top. When roller 97 rotates, it drives vertical rod 106 to rotate. Vertical rod 106 passes through a slide groove and has an arc strip 107 fixedly installed at its bottom. Arc groove 110 is formed on the surface of arc strip 107. A retaining strip 108 is slidably installed on the surface of worktable 1 near arc strip 107. A matching rod 109 is fixedly installed on the top of retaining strip 108. Matching rod 109 slides with arc groove 110. After vertical rod 106 rotates, it drives arc strip 107 to rotate, and elastic telescopic rod 102 moves freely. A pressure block 104 is slidably installed on the outer wall of the end. An arc strip 107 pushes a retaining strip 108 to move toward the pressure block 104. A compression spring 105 is provided between the pressure block 104 and the pressure plate 101. A side groove is opened on the side of the pressure block 104 near the retaining strip 108. The retaining strip 108 enters the side groove to limit the pressure block 104, so that the pressure block 104 continuously squeezes the compression spring 105 to make the pressure plate 101 cover the mobile phone shell tightly, ensuring that the mobile phone shell will not undergo slight deformation during the screw tightening process.

[0029] An elastic element is provided between the mating rod 109 and the arc groove 110. The arc strip 107 supports the locking strip 108 through the elastic element, pushing the locking strip 108 into the side groove. A ratchet 1012 is fixedly installed on the front side of the roller 97. A pawl 1011 is rotatably installed on the surface of the slide rod 96 near the ratchet 1012, so that the roller 97 can only rotate in one direction. When the upper shaft plate 3 resets upward and drives the roller 97 to reset upward, the surface of the roller 97 will not roll when it rubs against the top inclined area of ​​the stop block 98 which is resetting at the same time. This increases the friction between the roller 97 and the stop block 98, causing the stop block 98 to reset slowly, further extending the pressing time of the pressure plate 101 on the mobile phone shell. A second torsion spring is provided between the stop block 98 and the worktable 1. The stop block 98 resets under the elastic force of the second torsion spring.

[0030] In this embodiment, as mentioned earlier, the timing of tightening the screws by each tightening rod 7 differs. This causes the screws tightened earlier to drag the outer casing towards the screw holes, while the screws tightened later are forcibly locked in a slightly deformed state. After tightening, uneven residual stress remains on the surface of the phone casing. As the stress is slowly released, the phone casing warps, affecting normal use. When the lower shaft plate 2 moves downward, it drives the pressure plate 101 downward, moving it to the top of the phone casing and fitting it against it. As the lower shaft plate 2 continues to move downward, it compresses the elastic telescopic rod 102. The pressure on the elastic telescopic rod 102 exerts pressure on the pressure plate 101, causing it to press the phone casing tightly. Through the omnidirectional positioning and fixing of the phone casing by the pressure plate 101 and the mold 8, the local deformation path of the phone casing is eliminated, preventing the screws tightened earlier from being forcibly locked in a slightly deformed state, thus avoiding uneven stress on the surface of the phone casing.

[0031] When the elastic telescopic rod 102 is compressed, the fixed end moves downward, pushing the pressure block 104 downward. Meanwhile, when the stop block 98 rotates due to the pressure from the roller 97 on its top inclined area, it causes the vertical rod 106 to rotate. The rotation of the vertical rod 106 then causes the arc strip 107 to rotate, thereby pushing the locking strip 108 towards the pressure block 104 and into the side groove on the surface of the pressure block 104, thus limiting the movement of the pressure block 104. The locking strip 108 slides in contact with the arc groove 110 on the surface of the arc strip 107 via the mating rod 109. The advantage of this design is that the arc strip 107, through the support of the elastic element, pushes the locking strip 108 into the side groove. Once the locking strip 108 enters the side groove, it stops moving. The arc strip 107 continues to rotate under the rotation of the stop block 98. During the rotation to a standstill, the movement time of the arc strip 107 is longer than that of the retaining strip 108. The retaining strip 108 stops first, and the arc strip 107 stops later. Conversely, when the screw is tightened and the lower shaft plate 2 is reset upward, the stop block 98 is no longer squeezed by the roller 97. After the reset, the arc strip 107 resets first and then drives the retaining strip 108 to reset and release the limit on the pressure block 104. The retaining strip 108 limits the pressure block 104, so that the pressure block 104 continues to squeeze the spring 105 to make the pressure plate 101 cover the mobile phone shell tightly, ensuring that the mobile phone shell will not undergo slight deformation during the screw tightening process. At the same time, after the screw is tightened, the pressure block 104 will delay the reset so that the pressure plate 101 continues to squeeze the screw-tightened mobile phone shell for a period of time to stabilize the residual stress on the surface of the mobile phone shell before the mobile phone shell can be removed from the mold 8. Meanwhile, a ratchet 1012 and a pawl 1011 are provided at the roller 97 so that the roller 97 can only rotate in one direction. When the upper shaft plate 3 resets upward and drives the roller 97 to reset upward, the surface of the roller 97 will not roll when it rubs against the top inclined area of ​​the stop block 98 which is resetting at the same time. This increases the friction between the roller 97 and the stop block 98, causing the stop block 98 to reset slowly and further prolonging the pressing time of the pressure plate 101 on the mobile phone casing. Example

[0032] like Figures 1 to 11 As shown, this embodiment of an automatic screw-on robot for 4G flip phone production includes all the technical features of embodiment 2. In addition, a sliding plate 1101 is slidably installed on the inner wall of the mold 8. When the phone casing is placed into the mold 8, it squeezes the sliding plate 1101 downwards. A protruding rod 1102 is fixedly installed on the surface of the sliding plate 1101. After the sliding plate 1101 slides, it drives the protruding rod 1102 to slide. A vertical groove is opened on the surface of the mold 8, through which the protruding rod 1102 passes. A hook 1103 is slidably installed on the front side of the mold 8. The hook 1103 is retracted under the elastic force of the fifth spring. The convex rod 1102 is limited, which limits the sliding slide 1101. The top of the hook 1103 is provided with an inclined surface. A pressure rod 1104 is slidably installed on the front side of the mold 8. The hook 1103 is provided with an inclined surface near the pressure rod 1104. After the pressure rod 1104 moves, it squeezes the inclined surface of the hook 1103 and pushes the hook 1103 to move again. A fourth spring is provided between the slide 1101 and the mold 8. The elastic force of the fourth spring makes the slide 1101 return to its original position. A fifth spring is provided between the hook 1103 and the mold 8. The hook 1103 returns to its original position under the elastic force of the fifth spring.

[0033] A rotating plate 1105 is rotatably mounted on the inner wall of the skateboard 1101. A rotating shaft is fixedly mounted on the rear side of the rotating plate 1105, and the rotating shaft passes through the surface of the skateboard 1101. A rack 1107 is fixedly mounted on the inner wall of the mold 8 near the rotating shaft. A gear 1106 is fixedly mounted on one end of the rotating shaft near the rack 1107. After the gear 1106 moves, it contacts the rack 1107 and meshes with the rack 1107. The rack 1107 exerts a reaction force on the gear 1106, which pushes the gear 1106 to rotate. After the gear 1106 rotates, it drives the rotating plate 1105 to rotate. After the rotating plate 1105 rotates and tilts, it pours out the debris generated by the friction between the screws on the surface and the phone shell when tightening them, ensuring that the surfaces of the skateboard 1101 and the rotating plate 1105 are always flat, and ensuring that the phone shell is placed in the mold 8 without tilting.

[0034] A third torsion spring is provided between the rotating plate 1105 and the sliding plate 1101. The elastic force of the third torsion spring resets the rotating plate 1105 and provides support for the rotating plate 1105. A reset spring is provided between the pressure rod 1104 and the mold 8. The elastic force of the reset spring resets the pressure rod 1104.

[0035] In this embodiment, when the phone case is placed into mold 8, it will press the sliding plate 1101 downwards. After sliding, the sliding plate 1101 will drive the protruding rod 1102 to slide. After sliding, the protruding rod 1102 will press the top inclined surface of the hook 1103, pushing the hook 1103 to slide. After sliding, the hook 1103 will release its obstruction to the protruding rod 1102. When the protruding rod 1102 slides below the hook 1103, the hook 1103 will reset under the elastic force of the fifth spring, limiting the protruding rod 1102 and limiting the sliding plate 1101. When all the screws are in place and the phone case is removed, simply press the pressure rod 1104. After the pressure rod 1104 moves, it will press the inclined surface of the hook 1103 again, pushing the hook 1103 to move, releasing the obstruction to the protruding rod 1102 and the sliding plate 1101. The limit is released, and the slide plate 1101, under the elastic force of the fourth spring, bounces upward, causing the phone case to automatically rise from the mold 8, making it easier for staff to remove the phone case and improving work efficiency. At the same time, after the slide plate 1101 is lifted, it drives the gear 1106 to move. After the gear 1106 moves, it contacts the rack 1107 and meshes with the rack 1107. The rack 1107 pushes the gear 1106 to rotate through the reaction force. After the gear 1106 rotates, it drives the rotating plate 1105 to rotate. After the rotating plate 1105 rotates and tilts, it pours out the debris generated by the friction of the screws tightening on the surface of the phone case, ensuring that the surfaces of the slide plate 1101 and the rotating plate 1105 are always flat, ensuring that the phone case is placed in the mold 8 without tilting.

[0036] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0037] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. An automatic screw-on robot for 4G flip phone production, comprising: A workbench (1) and a lower shaft plate (2) are provided. The lower shaft plate (2) is set on the surface of the workbench (1). An upper shaft plate (3) is also provided on the surface of the workbench (1). Four electric screwdrivers (4) are provided on the top of the upper shaft plate (3). Screwdriver rods (5) are provided at the output end of the electric screwdrivers (4). Four connectors (6) are provided at the bottom of the lower shaft plate (2). Tightening rods (7) are provided on the inner wall of the connectors (6). The top of the tightening rods (7) is connected to the bottom of the screwdriver rods (5). The lower shaft plate (2), the upper shaft plate (3), and the electric screwdrivers (4) are connected to a control device. The upper shaft plate (3) is characterized in that a bracket (92) is fixedly installed on the top of the upper shaft plate (3) near the electric screwdrivers (4). A circular frame (91) is slidably installed on the top of the bracket (92). The screwdriver (4) is rotatably mounted on the inner wall of the circular frame (91). A first spring is provided between the circular frame (91) and the bracket (92). A first torsion spring is provided between the electric screwdriver (4) and the circular frame (91). A sliding frame (94) is slidably mounted on the outer wall of the circular frame (91). A first limiting hole (93) is opened on the outer wall of the electric screwdriver (4). A large insertion rod (95) is fixedly mounted on the top of the sliding frame (94). The large insertion rod (95) is in contact with the inner wall of the first limiting hole (93). A sliding rod (96) is slidably mounted on the surface of the upper shaft plate (3). The top of the sliding rod (96) is fixedly connected to the sliding frame (94). A roller (97) is rotatably mounted on the rear side of the sliding rod (96). Stops (98) are rotatably mounted on both sides of the workbench (1).

2. The automatic screw-on robot for 4G flip phone production according to claim 1, characterized in that, The workbench (1) is equipped with a mold (8), the support (92) is provided with a second limiting hole (99), the bottom of the circular frame (91) is fixed with a fixing rod, the circular frame (91) is slidably engaged with the support (92) through the fixing rod, the support (92) is slidably installed with a small insert rod (910) on one side of the second limiting hole (99), the small insert rod (910) is hinged with a diagonal rod (911) on the side of the sliding frame (94), the diagonal rod (911) is hinged to the sliding frame (94) at one end, and a stop bar (912) is fixedly installed on the side of the sliding frame (94) near the diagonal rod (911).

3. The automatic screw-on robot for 4G flip phone production according to claim 2, characterized in that, A second spring is provided between the sliding frame (94) and the circular frame (91), and a third spring is provided between the small insert rod (910) and the bracket (92).

4. The automatic screw-on robot for 4G flip phone production according to claim 3, characterized in that, An elastic telescopic rod (102) is fixedly installed at the bottom of the lower shaft plate (2). A pressure plate (101) is fixedly installed at the free end of the elastic telescopic rod (102). The top of the stop block (98) is provided with a sloping area and a straight area. A vertical rod (106) is fixedly installed at the bottom of the stop block (98). A sliding groove is provided at the intersection of the lower shaft plate (2) and the vertical rod (106). The vertical rod (106) passes through the sliding groove and an arc strip (107) is fixedly installed at its bottom. An arc groove is provided on the surface of the arc strip (107). 110), a retaining strip (108) is slidably installed on the surface of the workbench (1) near the arc strip (107). A matching rod (109) is fixedly installed on the top of the retaining strip (108). The matching rod (109) is slidably engaged with the arc groove (110). A pressure block (104) is slidably installed on the outer wall of the free end of the elastic telescopic rod (102). A compression spring (105) is provided between the pressure block (104) and the pressure plate (101). A side groove is opened on the side of the pressure block (104) near the retaining strip (108).

5. The automatic screw-on robot for 4G flip phone production according to claim 4, characterized in that, An elastic element is provided between the mating rod (109) and the arc groove (110), a ratchet (1012) is fixedly installed on the front side of the roller (97), a pawl (1011) is rotatably installed on the surface of the slide rod (96) near the ratchet (1012), and a second torsion spring is provided between the stop block (98) and the worktable (1).

6. The automatic screw-on robot for 4G flip phone production according to claim 5, characterized in that, A sliding plate (1101) is slidably installed on the inner wall of the mold (8). A protruding rod (1102) is fixedly installed on the surface of the sliding plate (1101). A vertical groove is opened on the surface of the mold (8). The protruding rod (1102) passes through the vertical groove. A hook (1103) is slidably installed on the front side of the mold (8). A slope is provided on the top of the hook (1103). A pressure rod (1104) is slidably installed on the front side of the mold (8). A slope is provided near the pressure rod (1104) of the hook (1103). A fourth spring is provided between the sliding plate (1101) and the mold (8). A fifth spring is provided between the hook (1103) and the mold (8).

7. The automatic screw-on robot for 4G flip phone production according to claim 6, characterized in that, A rotating plate (1105) is rotatably mounted on the inner wall of the slide plate (1101). A rotating shaft is fixedly mounted on the rear side of the rotating plate (1105). The rotating shaft passes through the surface of the slide plate (1101). A rack (1107) is fixedly mounted on the inner wall of the mold (8) near the rotating shaft. A gear (1106) is fixedly mounted on one end of the rotating shaft near the rack (1107).

8. The automatic screw-on robot for 4G flip phone production according to claim 7, characterized in that, A third torsion spring is provided between the rotating plate (1105) and the sliding plate (1101), and a reset spring is provided between the pressure rod (1104) and the mold (8).

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