A two-roll-mixer reverse-rotation device

Abstract

The application discloses a two-roller reverse rotation device for open mill after emergency stop, which comprises a moving module, a deceleration module and a reverse rotation module. The moving module comprises a frame arranged on the machine body and a flange arranged inside the frame. The flange can be controlled to carry a second gear and a second roller body away from a first roller body. The reverse rotation module is used for driving the first roller body and the second roller body to rotate in a second direction. The application relates to the technical field of open mill equipment, and combines roller body separation, inertia deceleration and automatic reverse rotation. After the machine body is suddenly stopped, the moving module first separates the two roller bodies to avoid continuous extrusion; the deceleration module then automatically brakes the driven roller to prevent foreign matters from continuing to be wound in. The whole process does not need manual intervention, and the risk of secondary injury is avoided. By separating the two roller bodies first and then reversing, impact load is relieved in the separation process, and equipment parts are effectively protected.

Description

Technical Field

[0001] This invention relates to the field of open mill equipment technology, specifically to a mixing roller reversal device for an open mill foot-kick emergency stop. Background Technology

[0002] An open mill is a piece of equipment used to process rubber materials. It mixes materials using two opposing rotating rollers. During normal operation, the two rollers rotate inwards relative to each other, driven by a motor, drawing the material into the gap between the rollers for shearing and mixing. However, occasionally during production, foreign objects such as operator's hands, gloves, or tools may accidentally get caught between the two rollers, which can easily lead to serious safety accidents.

[0003] Currently, in such emergencies, when both hands are caught in the equipment simultaneously, the emergency stop button cannot be pressed, potentially causing serious personal injury. The conventional approach when only one hand is caught is for the operator to immediately press the emergency stop button to brake the equipment. However, to protect equipment components, the two rollers will continue to move forward slowly half a turn due to inertia during the emergency stop, causing even greater injury. After the equipment stops, manual operation of the adjustment handle to reverse the rollers is usually required to remove the hand or foreign object. This process is not only inefficient and increases downtime, but the manual reversal can also cause secondary compression of the foreign object, posing a secondary threat of injury to the rollers or the operator's hand.

[0004] To address the aforementioned issues, existing technologies employ a foot-operated emergency stop main drive motor to control the roller reversal. However, the roller system of an open mill has enormous inertia; forcing it to switch from forward to reverse rotation in a short time generates a massive impact load, damaging components such as the motor and bearings, and shortening the equipment's lifespan. Therefore, designing a device that can safely, efficiently, and automatically reverse the rollers after an emergency stop to remove foreign matter, while simultaneously protecting the equipment from impact, is a pressing technical problem in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a foot-operated emergency stop device for open mills that reverses the mixing rollers after an emergency stop. This solves the problems caused by existing open mills requiring manual emergency stop via a manual button and then using the main drive motor to control the roller reversal, which can damage the equipment's components and cause secondary compression of hands and foreign objects during reversal.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a mixing roll reversal device after a foot-kick emergency stop of an open mill, comprising a machine body and a first roll body and a second roll body that rotate in a first direction on the machine body, wherein a first extension roll is provided on the portion of the first roll body that extends out of the machine body, and a second extension roll is provided on the portion of the second roll body that extends out of the machine body, wherein a first gear and a second gear that can mesh with each other are respectively provided on the first extension roll and the second extension roll.

[0007] Also includes:

[0008] The moving module includes a frame disposed on the body and a flange located inside the frame, wherein the second extension roller is disposed on the flange; wherein the flange can be controlled to carry the second roller away from the first roller.

[0009] The deceleration module includes two clamping arms arranged opposite each other; wherein the two clamping arms are used to clamp the flange on the second extension roller during movement to decelerate the second roller body;

[0010] A reverse rotation module is used to drive the first roller and the second roller to rotate in a second direction;

[0011] The reverse rotation module includes:

[0012] The first sprocket is mounted on the first extension roller;

[0013] Two third sprockets are connected to the first sprocket via belts;

[0014] The first reverse drive gear meshes with the second gear after displacement, causing the second roller to rotate in the second direction;

[0015] The second reverse drive gear is connected to the first reverse drive gear and rotates in the same direction;

[0016] The transmission gear meshes with the second anti-drive gear;

[0017] The movable transmission assembly includes a sleeve rotatably connected to the second extension roller, and a driven gear and a second sprocket disposed on the sleeve;

[0018] The transmission gear meshes with the driven gear after displacement, driving the second sprocket to rotate. The second sprocket after displacement drives the first sprocket and the first roller to rotate in the second direction via a belt.

[0019] Preferably, the two third sprockets are positioned above and below the second sprocket, and the belt overlaps the two third sprockets and the first sprocket, forming a triangular space on the inner side of the belt. The second sprocket is located in the triangular space and close to the belt wall between the two third sprockets.

[0020] Preferably, the two third sprockets are rotatably connected to two shafts, and the two shafts are connected to an elastic displacement mechanism, so that when the second sprocket is engaged with the belt and continues to move, the two shafts can carry the third sprockets to move inward relative to each other.

[0021] Preferably, the elastic displacement mechanism includes a vertical plate, a reference seat is fixed to the center of the front of the vertical plate, and connecting seats are slidably connected to the upper and lower ends of the front of the vertical plate. The two shafts are respectively connected to the two connecting seats, and the connecting seats are connected to the reference seat through a second elastic element.

[0022] Preferably, a rectangular frame for accommodating the frame is provided on the side wall of the machine body, and a manually adjustable shaft is provided on the front side of the machine body, which drives the frame to move within the rectangular frame.

[0023] Preferably, an electric cylinder is provided on the front side of the machine body, and the output end of the electric cylinder passes through the machine body and the frame and is connected to the flange, driving the flange to move within the frame.

[0024] Preferably, the first reverse drive gear and the second reverse drive gear are mounted on a main shaft, which is driven to rotate by a drive motor.

[0025] Preferably, the deceleration module further includes:

[0026] The rack is fixed to the frame.

[0027] A back plate, on which two clamping arms are rotatably connected; the upper part of the inner wall surface of each clamping arm has a fitting part, and the lower part has a clamping part;

[0028] A shaft is rotatably connected to the lower part of the back plate. A cam is provided at the front end of the shaft and abuts against the fitting part after the cam rotates. A transmission gear is provided at the rear end of the shaft and meshes with a rack.

[0029] When the flange moves, the transmission gear meshes with the rack and pinion, causing the cam to rotate, so that the clamping arm clamps onto the second extension roller.

[0030] Preferably, a first elastic element is provided on the inner side of the two clamping arms to drive the two clamping arms to move inward relative to each other.

[0031] The beneficial effects of this invention are as follows: By using the foot-operated emergency stop mixing roller reversal device for open mills provided by this invention, compared with the prior art, this device combines roller separation, inertial deceleration, and automatic reversal. After the machine stops suddenly, the moving module first separates the two rollers to avoid continuous compression; the deceleration module then automatically brakes the driven roller to prevent foreign objects from being further entrained; finally, the reverse rotation module drives the two rollers to reverse synchronously, actively expelling foreign objects. The entire process requires no manual intervention, avoiding the risk of secondary injury.

[0032] By separating the two rollers first and then reversing them, the impact load is relieved during the separation process, effectively protecting the equipment components and preventing the two rollers from continuously squeezing foreign objects, thus preventing continuous damage to the foreign objects and secondary damage to the rollers. Attached Figure Description

[0033] Figure 1 This is an isometric view of the present invention;

[0034] Figure 2 This is a top view of the first state of the present invention;

[0035] Figure 3 This is a top view of the second state of the present invention;

[0036] Figure 4 This is a first-view isometric view of the deceleration module of the present invention;

[0037] Figure 5 This is a second-view isometric view of the deceleration module of the present invention;

[0038] Figure 6 For the present invention Figure 2 Sectional view along line AA;

[0039] Figure 7 For the present invention Figure 2 Sectional view along the BB direction;

[0040] Figure 8 For the present invention Figure 2 C-axis sectional view;

[0041] Figure 9 This is a schematic diagram of the flange and frame connection structure of the present invention;

[0042] Figure 10 This is a schematic diagram of the clamping arm of the present invention clamping the second extension roller;

[0043] Figure 11 This is an isometric view of the elastic displacement mechanism of the present invention;

[0044] Figure 12 This is an isometric view of the overall shape of the invention.

[0045] Explanation of the reference numerals in the figure:

[0046] 1. First roller body; 2. Second roller body; 3. First gear; 4. Second gear; 5. Reduction module; 51. Back plate; 52. Clamping arm; 53. Fitting part; 54. Cam; 55. First elastic element; 56. Clamping part; 57. Rack; 58. Transmission gear; 6. Flange; 7. Frame; 8. Manual adjustment shaft; 9. Electric cylinder; 10. First reverse drive gear; 11. Second reverse drive gear; 12. Drive motor; 13. First sprocket; 14. Second sprocket; 15. Third sprocket; 16. Shaft; 17. Driven gear; 18. Sleeve; 19. Rectangular frame; 20. Vertical plate; 21. Connecting seat; 22. Reference seat; 23. Second elastic element; 24. First extension roller; 25. Second extension roller; 26. Transmission gear. Detailed Implementation

[0047] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Various changes can be made to the implementation schemes as long as the effects of the present invention can be achieved.

[0049] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0050] like Figures 1 to 12 As shown in the illustration, this application proposes a foot-kick emergency stop device for a two-roll mill, comprising a machine body with a foot-kick emergency stop switch plate at the bottom. It also includes a first roller 1 and a second roller 2 that rotate along a first direction on the machine body. The first roller 1 is a drive roller, and the second roller 2 is a driven roller. In this embodiment, the first direction is the inward rotation direction of the first roller 1 and the second roller 2, i.e., the rotation direction of the two-roll mill under normal operating conditions. For example... Figure 2 The first state shown is the state in which the first roller 1 and the second roller 2 rotate in the first direction.

[0051] Reference Figures 1 to 3In this embodiment, the portion of the first roller 1 extending out of the machine body is provided with a first extension roller 24, and the portion of the second roller 2 extending out of the machine body is provided with a second extension roller 25. The first extension roller 24 and the second extension roller 25 are respectively provided with a first gear 3 and a second gear 4 that can mesh with each other. When the first roller 1 and the second roller 2 rotate in the first direction, the first gear 3 and the second gear 4 on their ends, the first extension roller 24 and the second extension roller 25, mesh with each other, so that the first roller 1 drives the second roller 2 to rotate in the working state of rotating in the first direction.

[0052] Reference Figures 1 to 3 This embodiment also includes a moving module for driving the second roller 2 to move, a deceleration module 5 for reducing the rotational speed of the rotating second roller 2, and a reversing rotation module for rotating the first roller 1 and the second roller 2 in opposite directions to achieve a second direction rotation. In one working condition, for example... Figure 3 The second state is characterized by the separation of the first roller 1 and the second roller 2. In case of an emergency where foreign objects are caught between the first roller 1 and the second roller 2, the operator can stop the first roller 1 by stepping on the foot-operated emergency stop switch on the machine. At this time, the moving module moves the second roller 2 away from the first roller 1, creating a gap between the two rollers to prevent them from continuously squeezing the foreign object and facilitating its removal. Since the second roller 2 is driven away from the first roller 1 by the moving module when the first roller 1 stops, it continues to rotate due to inertia. The deceleration module 5 then slows down the rotating second roller 2 and stops it, preventing it from continuing to roll the foreign object downwards. The reverse rotation module rotates the separated first roller 1 and the second roller 2 in the opposite direction to assist the operator in removing the squeezed foreign object.

[0053] For example, such as Figure 9 As shown, the moving module includes a frame 7 mounted on the machine body and a flange 6 located inside the frame 7. A second extension roller 25 is mounted on the flange 6. The flange 6 can be controlled to carry the second gear 4 and the second roller 2 away from the first roller 1. In an exemplary embodiment where the flange 6 can move within the frame 7, an electric cylinder 9 is provided on the front side of the machine body. The output end of the electric cylinder 9 passes through the machine body and the frame 7 and is connected to the flange 6, driving the flange 6 to move within the frame 7. It should be noted that the output rod of the electric cylinder 9 passes through the frame 7, and there is no fixed connection between the two.

[0054] Furthermore, a rectangular frame 19 for accommodating the frame 7 is provided on the side wall of the machine body, and a manual adjustment shaft 8 is provided on the front side of the machine body. The manual adjustment shaft 8 is a screw that is screwed to the machine body. A handle is provided at the end that extends out of the machine body, and the end that extends into the machine body is rotatably connected to the frame 7. The manual adjustment shaft 8 drives the frame 7 to move within the rectangular frame 19.

[0055] In one embodiment, when it is necessary to adjust the flange 6, second gear 4, and second roller 2 away from the first roller 1 separately, only the electric cylinder 9 needs to operate alone. However, when it is necessary to adjust the gap between the first roller 1 and the second roller 2, the position of the frame 7 within the rectangular frame 19 is first adjusted by manually adjusting the shaft 8, and then the position of the flange 6 and the second roller 2 is adjusted by the electric cylinder 9. For example, when it is necessary to adjust the gap between the first roller 1 and the second roller 2, the handle on the manual adjusting shaft 8 can be rotated to push the frame 7 towards... Figure 9 The flange 6 is moved to the far right as indicated in the diagram. Then, the electric cylinder 9 pushes the flange 6 to move the second roller 2 to the right, bringing the second roller 2 close to the first roller 1 to achieve the ideal gap between the first roller 1 and the second roller 2 during the operation of the open mill. When subsequent separation and reversal are required, the electric cylinder 9 pulls the flange 6 to move to the left within the frame 7.

[0056] like Figure 1 , Figure 4 , Figure 5 and Figure 10 As shown, the deceleration module 5 includes two clamping arms 52 arranged opposite to each other. The upper part of the inner wall surface of the clamping arm 52 has a fitting part 53, and the lower part has a clamping part 56. The two clamping arms 52 are used to follow the flange 6 when it moves and clamp it inward on the second extension roller 25 to decelerate the second roller body 2.

[0057] To achieve the above objectives, the deceleration module 5 in this embodiment further includes a rack 57, a back plate 51, and a shaft. The bottom of the back plate 51 is fixed to the flange 6, the rack 57 is fixed to the frame 7, and two clamping arms 52 are rotatably connected to the back plate 51. The shaft is rotatably connected through the lower part of the back plate 51. A cam 54 is located at the front end of the shaft on the back plate 51, and the cam 54 abuts against the contact part 53 after rotation. A transmission gear 58 is located at the rear end of the shaft on the back plate 51, and the transmission gear 58 meshes with the rack 57.

[0058] The inner sides of the two clamping arms 52 are provided with first elastic elements 55, which drive the two clamping arms 52 to move inward relative to each other.

[0059] When the flange 6 moves, the transmission gear 58 meshes with the rack 57, driving the cam 54 to rotate, so that the clamping arm 52 is clamped on the second extension roller 25.

[0060] For example, when the electric cylinder 9 drives the flange 6 and the second extension roller 25 connected to the second roller body 2 to move within the frame 7, the flange 6 synchronously drives the two clamping arms 52 and the back plate 51 to move. At this time, the transmission gear 58 meshes with the rack 57, causing the shaft to rotate in the first direction. The shaft drives the cam 54 to rotate, and the cam 54 disengages from the contact with the two clamping arms 52, causing the two clamping arms 52 to move inward under the pull force of the first elastic element 55 and clamp onto the second extension roller 25, thus slowing down the second roller body 2. It should be explained in detail that during the displacement of the flange 6, the transmission gear 58 rotates continuously, driving the cam 54 to rotate 180°, even as the state of the cam 54 and the two clamping arms 52 changes from separation to clamping and then back to separation.

[0061] Conversely, when the foreign matter between the first roller body 1 and the second roller body 2 is removed and normal operation is resumed, the electric cylinder 9 drives the flange 6 and the second extension roller 25 connected to the second roller body 2 to move and reset within the frame 7. The flange 6 synchronously drives the two clamping arms 52 and the back plate 51 to move. At this time, the transmission gear 58 meshes with the rack 57 to make the shaft rotate in the second direction. The shaft drives the cam 54 to rotate. The cam 54 is in a horizontal state and abuts against the two clamping arms 52, causing the two clamping arms 52 to open and disengage from the second extension roller 25, so that the second roller body 2 can work normally without interference.

[0062] like Figures 1 to 3 and Figures 6 to 8 As shown, the reverse rotation module is used to drive the first roller 1 and the second roller 2 to rotate in a second direction. The second direction is the outward rotation direction of the first roller 1 and the second roller 2, which is the opposite rotation direction to the normal operation of the open mill.

[0063] Specifically, the reverse rotation module includes a first sprocket 13, two third sprockets 15, a first reverse drive gear 10, a second reverse drive gear 11, a transmission gear 26, and a movable transmission assembly. The first reverse drive gear 10 and the second reverse drive gear 11 are mounted on a main shaft, which is driven to rotate by a drive motor 12. Furthermore, this main shaft is rotatably connected to a support frame (not shown in the figure).

[0064] The first sprocket 13 is mounted on the first extension roller 24. Two third sprockets 15 are rotatably connected to two shafts 16, and the two third sprockets 15 are connected to the first sprocket 13 via belts. The first reverse drive gear 10 meshes with the displaced second gear 4, causing the second roller 2 to rotate in the second direction. The second reverse drive gear 11 is connected to the first reverse drive gear 10 and rotates in the same direction. The transmission gear 26 meshes with the second reverse drive gear 11, causing the transmission gear 26 to rotate in the opposite direction to the second reverse drive gear 11.

[0065] The movable transmission assembly includes a sleeve 18 rotatably connected to the second extension roller 25 via bearings, and a driven gear 17 and a second sprocket 14 disposed on the sleeve 18. The transmission gear 26 meshes with the displaced driven gear 17, driving the second sprocket 14 to rotate. This displaced second sprocket 14 then drives the first sprocket 13 and the first roller body 1 to rotate in a second direction via a belt.

[0066] In one embodiment, when the flange 6 displaces and separates the first roller 1 and the second roller 2, the second extension roller displaces to the left, causing the second gear 4 to mesh with the first reverse drive gear 10 and the driven gear 17 to mesh with the transmission gear 26. Simultaneously, the second sprocket 14 engages with the belt. At this time, the drive motor 12 operates, driving the first reverse drive gear 10 and the second reverse drive gear 11 to rotate synchronously in the forward direction. Therefore, the meshing of the first reverse drive gear 10 and the second gear 4 causes the second extension roller 25 and the second roller 2 to reverse (i.e., rotate in the second direction). Then, the meshing of the driven gear 17 and the transmission gear 26 causes the sleeve 18 to rotate forward on the rotating second extension roller 25, so that the belt drives the first sprocket 13 to rotate forward, thereby causing the first extension roller 24 and the first roller 1 to reverse (i.e., rotate in the second direction).

[0067] like Figure 8 As shown, the two third sprockets 15 are positioned above and below the second sprocket 14. The belt overlaps the two third sprockets 15 and the first sprocket 13, forming a triangular space on the inner side of the belt. The second sprocket 14 is located in the triangular space and is close to the belt wall between the two third sprockets 15.

[0068] Two shafts 16 are connected to an elastic displacement mechanism, allowing the second sprocket 14 to engage with the belt and continue to move, enabling the two shafts 16 to carry the third sprocket 15 inward relative to each other. For example, the distance between the second sprocket 14 and the belt is A, and the movement distance of the flange 6 is B, where A > B. This allows the second sprocket 14 to continue moving after contacting the belt, increasing the contact stability between the belt and the second sprocket 14 and ensuring stable belt operation.

[0069] like Figure 11As shown, the elastic displacement mechanism includes a vertical plate 20, a reference seat 22 fixed to the center of the front of the vertical plate 20, and connecting seats 21 slidably connected to the upper and lower ends of the front of the vertical plate 20. Two shafts 16 are respectively connected to the two connecting seats 21, and the connecting seats 21 are connected to the reference seat 22 through a second elastic element 23. When the belt is stretched by the second sprocket 14, the two third sprockets 15 are displaced by the tension of the belt. At this time, the two third sprockets 15 drive the shafts 16 and the connecting seats 21 to compress the second elastic element 23 towards the reference seat 22. When the flange 6 is reset, the second sprocket 14 gradually disengages from the belt. At this time, the elastic pushing force of the second elastic element 23 causes the two third sprockets 15 to reset, ensuring the tension of the belt.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foot-kick type emergency stop device for reversing mixing rolls after an open mill, comprising a mill body and a first roll and a second roll rotating on the mill body in a first direction, characterized in that: The portion of the first roller extending out of the machine body is provided with a first extension roller, and the portion of the second roller extending out of the machine body is provided with a second extension roller. The first extension roller and the second extension roller are respectively provided with a first gear and a second gear that can mesh with each other. Also includes: The moving module includes a frame mounted on the machine body and a flange located inside the frame, wherein the second extension roller is mounted on the flange; wherein the flange can be controlled to carry the second roller away from the first roller; a rectangular frame for accommodating the frame is provided on the side wall of the machine body, and a manually adjustable shaft is provided on the front side of the machine body, the manually adjustable shaft driving the frame to move within the rectangular frame; The deceleration module includes two clamping arms arranged opposite each other; wherein the two clamping arms are used to clamp the flange onto the second extension roller during movement, thereby decelerating the second roller body; the deceleration module further includes: The rack is fixed to the frame. A back plate, on which two clamping arms are rotatably connected; the upper part of the inner wall surface of each clamping arm has a fitting part, and the lower part has a clamping part; A shaft is rotatably connected to the lower part of the back plate. A cam is provided at the front end of the shaft and abuts against the fitting part after the cam rotates. A transmission gear is provided at the rear end of the shaft and meshes with a rack. When the flange moves, the transmission gear meshes with the rack and pinion to drive the cam to rotate, so that the clamping arm clamps on the second extension roller; A reverse rotation module is used to drive the first roller and the second roller to rotate in a second direction; The reverse rotation module includes: The first sprocket is mounted on the first extension roller; Two third sprockets are connected to the first sprocket via belts; The first reverse drive gear meshes with the second gear after displacement, causing the second roller to rotate in the second direction; The second reverse drive gear is connected to the first reverse drive gear and rotates in the same direction; The transmission gear meshes with the second anti-drive gear; The movable transmission assembly includes a sleeve rotatably connected to the second extension roller, and a driven gear and a second sprocket disposed on the sleeve; The transmission gear meshes with the driven gear after displacement, driving the second sprocket to rotate. The second sprocket after displacement drives the first sprocket and the first roller to rotate in the second direction via a belt.

2. The mixing roll reversing device after a foot-kick emergency stop on an open mill according to claim 1, characterized in that: The two third sprockets are positioned above and below the second sprocket. The belt overlaps the two third sprockets and the first sprocket, forming a triangular space on the inner side of the belt. The second sprocket is located in the triangular space and is close to the belt wall between the two third sprockets.

3. The mixing roll reversing device after a foot-kick emergency stop on an open mill according to claim 2, characterized in that: The two third sprockets are rotatably connected to two shafts, which are connected to an elastic displacement mechanism. When the second sprocket is attached to the belt and continues to move, the two shafts can carry the third sprockets to move inward relative to each other.

4. The mixing roller reversing device after a foot-kick emergency stop on an open mill according to claim 3, characterized in that: The elastic displacement mechanism includes a vertical plate, a reference seat is fixed in the center of the front of the vertical plate, and connecting seats are slidably connected to the upper and lower ends of the front of the vertical plate. The two shafts are respectively connected to the two connecting seats, and the connecting seats are connected to the reference seat through a second elastic element.

5. The mixing roller reversal device after foot-kick emergency stop of an open mill according to claim 1, characterized in that: An electric cylinder is installed on the front side of the machine body. The output end of the electric cylinder passes through the machine body and the frame and is connected to the flange, driving the flange to move within the frame.

6. The mixing roll reversing device after a foot-kick emergency stop on an open mill according to claim 1, characterized in that: The first and second anti-drive gears are mounted on a main shaft, which is driven to rotate by a drive motor.

7. The mixing roll reversing device after a foot-kick emergency stop on an open mill according to claim 1, characterized in that: The inner sides of the two clamping arms are provided with a first elastic element, which drives the two clamping arms to move inward relative to each other.

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