A rubber opening and mixing device

Abstract

The utility model discloses a rubber open mill device relates to open mill technical field, rubber open mill device includes: open mill, it has double roller, and the double roller is limited between the feed inlet, and open mill is equipped with the feeding area of setting close to feed inlet, and the feeding area includes the first area and the second area of being linked, and the second area is located between the feed inlet and the first area, first safety grating is located in the first area, and be configured to can produce first detection signal when the foot of operator is located in the first area, second safety grating is located in the second area, and be configured to can produce second detection signal when the foot of operator is located in the second area, wherein, open mill is configured to can stop when second detection signal is from yes to no and does not have first detection signal. The utility model can improve the use safety performance, prevent the operator from being seriously hurt by the roller.

Description

Technical Field

[0001] This utility model relates to the field of open mill technology, and in particular to a rubber open milling device. Background Technology

[0002] The open mill (also known as a rubber mixing mill) is a fundamental piece of machinery in the rubber and plastics industry, and it is used in tire manufacturing. The open mill uses the mechanical shearing and extrusion actions applied by two parallel rollers to achieve processes such as plasticizing, mixing, and sheeting of materials. Specifically, when the material is drawn into the gap between the two rollers, the shearing force generated by the difference in roller speed causes the molecular chains of the material to break. Combined with thin-pass plasticizing or roll-wrapping plasticizing methods, this improves the plasticity of the material.

[0003] Currently, open mills typically require direct manual operation, with materials being fed into the gap between the mill's two rollers. This poses a significant risk, as operators are easily drawn into the gap and suffer serious injury, especially with older, more established open mills. Therefore, effectively preventing operators from being pulled into the dangerous area of ​​the open mill's two rollers to improve equipment safety is a crucial issue that warrants investigation. There is an urgent need for a safety device to effectively detect whether operators are being drawn into the gap between the open mill's two rollers. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a rubber mixing apparatus that improves safety and effectively prevents serious injury to operators during the rubber mixing process.

[0005] This utility model embodiment provides a rubber mixing apparatus, which includes:

[0006] An open mill has two rollers with a feed inlet defined between them. The open mill is provided with a feeding zone located near the feed inlet. The feeding zone includes a first area and a second area that are connected to each other. The second area is located between the feed inlet and the first area.

[0007] A first safety light curtain is disposed in the first area and configured to generate a first detection signal when the operator's feet are located in the first area;

[0008] A second safety light curtain is disposed in the second area and configured to generate a second detection signal when the operator's feet are located in the second area;

[0009] The open mill is configured to stop when the second detection signal changes from present to absent and the first detection signal is absent.

[0010] The rubber mixing apparatus according to the embodiments of this utility model has at least the following beneficial effects: During the rubber mixing process, the operator enters the feeding area and feeds one end of the material into the feed inlet of the mixing mill in the second area; when the operator walks to the first area, the first safety light curtain generates a first detection signal; when the operator walks to the second area, the second safety light curtain generates a second detection signal; during the feeding process, the operator is located in the second area, causing the second safety light curtain to continuously generate a second detection signal. If the operator is about to be carried into the gap between the two rollers by the material, the operator's feet will leave the second area, causing the second detection signal generated by the second safety light curtain to disappear. At the same time, the first safety light curtain does not generate a first detection signal. This indicates that the operator has encountered danger, and the mixing mill will quickly stop running to prevent the operator from suffering serious injury from the mixing mill, thereby protecting the operator's personal safety and improving the safety of the rubber mixing apparatus.

[0011] In some embodiments of the present invention, the rubber mixing apparatus further includes an alarm device, which is configured to emit at least one of an audible alarm message and an optical alarm message when the first detection signal changes from present to absent and the second detection signal is absent.

[0012] In some embodiments of this utility model, the alarm device is a warning light, which is configured to emit a first light warning signal when the first detection signal is generated, and to emit a second light warning signal when the second detection signal is generated.

[0013] In some embodiments of this utility model, the warning light is also configured to emit a third light warning signal when there are no first detection signal and second detection signal and the open mill has not stopped.

[0014] In some embodiments of the present invention, the open mill has a brake mechanism configured to brake the twin rollers when the second detection signal changes from present to absent and the first detection signal is absent.

[0015] In some embodiments of this utility model, the first safety light curtain and the second safety light curtain are both disposed below the feed inlet. The first safety light curtain and the second safety light curtain are arranged sequentially along the first direction and are located on one side of the feed inlet along the first direction. The first safety light curtain and the second safety light curtain are both configured to emit a detection beam along the second direction. The first direction, the second direction and the up and down direction are perpendicular to each other.

[0016] In some embodiments of this utility model, both the first safety light curtain and the second safety light curtain are through-beam safety light curtains; and / or,

[0017] The dimension of the first safety light curtain along the first direction is larger than the dimension of the second safety light curtain along the first direction; and / or,

[0018] The second region and the feed inlet have a set distance in the first direction.

[0019] In some embodiments of this utility model, the first safety light curtain and the second safety light curtain are arranged vertically at intervals, and the detection range of the first safety light curtain partially overlaps with the detection range of the second safety light curtain.

[0020] In some embodiments of this utility model, the feeding area is provided with supports on both sides along the second direction, and the first safety light curtain and the second safety light curtain are disposed on the supports.

[0021] In some embodiments of this utility model, the bracket is provided with a receiving groove on the side of the feeding area along the second direction, and the opening of the receiving groove is open on the side of the second direction. The first safety light curtain and the second safety light curtain are disposed in the receiving groove.

[0022] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0023] Figure 1 This is a side view schematic diagram of a rubber mixing apparatus provided according to an embodiment of the present utility model;

[0024] Figure 2 This is a top view schematic diagram of a rubber mixing apparatus provided according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram showing the relative positions of the first and second safety light curtains when they are mounted on a bracket according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram showing the electrical connection between the control device provided according to an embodiment of the present invention and the first safety light curtain, the second safety light curtain, the alarm device, and the open mill.

[0027] Reference numerals: 100, open mill; 110, roller; 120, support pedal; 200, bracket; 210, crossbar; 211, receiving groove; 220, vertical bar; 310, first safety light curtain; 320, second safety light curtain; 400, alarm device. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "several" means one or more, and "multiple" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The following is for reference. Figures 1 to 4 This invention describes a rubber mixing apparatus provided according to an embodiment of the present invention.

[0032] like Figures 1 to 4 As shown, the rubber mixing apparatus according to the embodiment of this utility model can be applied in the tire manufacturing process. It has the advantages of unique structural design and high safety, and can meet the requirements for safe use. It can effectively prevent operators from being injured by the rollers 110 of the mixing mill 100 and prevent accidents from occurring.

[0033] The rubber mixing apparatus has a first direction, a second direction, and a vertical direction, wherein the first direction, the second direction, and the vertical direction are arranged perpendicularly to each other. In this embodiment, it is assumed that the first direction is the front-to-back direction, and the second direction is the left-to-right direction.

[0034] like Figure 1 and Figure 2 As shown, the structure of the rubber mixing apparatus includes a mixing mill 100, a first safety light curtain 310, and a second safety light curtain 320.

[0035] The open mill 100 has two rollers with a feed inlet between them, allowing rubber material to enter the gap between the rollers and complete the mixing process under the mechanical shearing and extrusion action of the rollers. The feed inlet is located on one side of the open mill 100 along a first direction. The open mill 100 has a feeding area located near the feed inlet, with a certain distance between the feeding area and the feed inlet in the first direction. The feeding area provides a standing position for the operator. The feeding area includes a first region and a second region, which are arranged sequentially along the first direction and connected to each other. The second region is located between the feed inlet and the first region, meaning it is closer to the feed inlet.

[0036] It is understood that the open mill 100 is an existing structure, and this embodiment does not propose any improvements to the specific structure of the open mill 100. Those skilled in the art should understand its specific structure and working principle, which will not be described in detail here. The open mill 100 may be, but is not limited to, the 710 model open mill 100.

[0037] During rubber mixing, the operator walks in a first direction, passing through the first and second zones sequentially. Then, the operator stands in the second zone and feeds the rubber material into the gap between the two rollers. As the open mill 100 operates, the two rollers continuously entrain the rubber material, which is then conveyed to the open mill 100 via a conveying mechanism such as a roller conveyor. Additionally, the operator manually folds the rubber material on the two rollers repeatedly to ensure there are no undispersed additives, thus guaranteeing good uniformity in the rubber mixing process.

[0038] In this embodiment, the two rollers on the open mill 100 are arranged parallel and spaced apart, with the length of the rollers 110 extending along a second direction. The rotation directions of the two rollers are opposite. The feed inlet is located at the front of the open mill 100, the second region is located in front of the feed inlet, and the first region is located in front of the second region. The first region is farther from the feed inlet, and the second region is closer to the feed inlet; therefore, the first region is designated as a safe region, and the second region as a danger region. The second region and the feed inlet have a set distance in the first direction. The specific value of the set distance can be set according to the actual situation and is not specifically limited here, as long as it allows the operator to stand in the second region to complete manual feeding and manual turning of materials.

[0039] In addition, the feeding area is equipped with a support pedal 120, which has a certain height distance from the ground, allowing operators to stand on the support pedal 120 to manually feed and turn materials.

[0040] A first safety light curtain 310 is disposed within a first area, and the first safety light curtain 310 is configured to detect whether the operator's feet are within the first area, and to generate a first detection signal when the operator's feet are within the first area. When the operator's feet are not within the first area, the first safety light curtain 310 does not generate a first detection signal.

[0041] A second safety light curtain 320 is disposed within the second area, and is configured to detect whether the operator's feet are within the second area, and to generate a second detection signal when the operator's feet are within the second area. When the operator's feet are not within the second area, the second safety light curtain 320 does not generate a second detection signal.

[0042] In this embodiment, both the first safety light curtain 310 and the second safety light curtain 320 are positioned below the feed inlet, meaning their height is lower than the feed inlet, enabling them to detect the operator's feet. Since the first and second regions are arranged sequentially along a first direction, the first and second safety light curtains 310 and 320 are also arranged sequentially along this direction, and both are located on one side of the feed inlet along the first direction. The first safety light curtain 310 is positioned away from the feed inlet, while the second safety light curtain 320 is positioned close to it. The installation height of the first and second safety light curtains 310 and 320 is set according to actual needs, as long as it allows them to detect the operator's feet. When the support pedal 120 is provided, the installation height of the first safety light curtain 310 and the second safety light curtain 320 is higher than that of the support pedal 120.

[0043] Both the first safety light curtain 310 and the second safety light curtain 320 are configured to emit a detection beam along a second direction. Both the first safety light curtain 310 and the second safety light curtain 320 are through-beam safety light curtains. Through-beam safety light curtains can detect whether they are obstructed by reflecting an infrared beam, thereby determining whether an object or person has entered their detection area.

[0044] Specifically, the through-beam safety light curtain includes a transmitter and a receiver. The transmitter is responsible for emitting an infrared beam, and the receiver is responsible for receiving the infrared beam after reflection or obstruction. When the infrared beam is obstructed, the receiver loses its signal, allowing the through-beam safety light curtain to generate a detection signal, which can trigger an alarm or shutdown command. If the receiver does not receive the infrared beam, it outputs a high level, in which case the first safety light curtain 310 generates a first detection signal, and the second safety light curtain 320 generates a second detection signal. If the receiver receives the infrared beam, it outputs a low level, in which case the first safety light curtain 310 does not generate a first detection signal, and the second safety light curtain 320 does not generate a second detection signal.

[0045] The open mill 100 is configured to stop when the second detection signal changes from present to absent and the first detection signal is absent. Specifically, the open mill 100 has a brake mechanism that can be used to apply rapid braking to the twin rolls of the open mill 100, and the brake mechanism is configured to brake the twin rolls when the second detection signal changes from present to absent and the first detection signal is absent.

[0046] It is understood that the brake mechanism is an existing structure and a core safety device of the braking system of the open mill 100. It is used to quickly brake the rotation of the roller 110 during an emergency stop of the open mill 100, preventing personal injury and equipment damage. This embodiment does not make any structural improvements to the brake mechanism; therefore, those skilled in the art should understand its specific structure and working principle, which will not be described in detail here. The brake mechanism can perform braking actions via electromagnetic means or by actuation.

[0047] When the first detection signal is not generated and the second detection signal changes from present to absent, it indicates that the operator's feet are in the second area but not in the first area. Furthermore, the operator's feet have left the second area but have not stepped into the first area. This indicates that the operator is about to be caught in the gap between the twin rollers of the open mill 100. The first safety light curtain 310 switches from the "first detection signal present" state to the "no first detection signal" state. Then, the brake mechanism operates, stopping the rotation of the twin rollers of the open mill 100, ensuring that the operator will not suffer mechanical injury. Because the shutdown response speed is usually very fast, the probability of a safety accident can be minimized.

[0048] In addition, such as Figure 4As shown, the rubber mixing apparatus also includes a control device. The signal input terminals of the control device are electrically connected to the first safety light curtain 310 and the second safety light curtain 320 via wiring, respectively. The signal output terminals of the control device are electrically connected to the mixing mill 100 via wiring. Specifically, the control device is electrically connected to the brake mechanism. The control device can be a programmable controller such as a PLC controller, a 51 microcontroller, or a host computer. The control device can be integrated into the mixing mill 100 or designed separately from it.

[0049] The control device can receive the first detection signal generated by the first safety light curtain 310 and the second detection signal generated by the second safety light curtain 320, and generate a control command based on the presence or absence of the first and second detection signals, and send the control command to the brake mechanism to enable the brake mechanism to operate and apply a rapid braking effect to the double rollers.

[0050] During the use of the rubber mixing apparatus provided in this embodiment, the operator will enter the feeding area and feed one end of the material into the feed inlet of the mixing mill 100 in the second area, or perform material turning. When the operator moves to the first area, the first safety light curtain 310 will generate a first detection signal. When the operator moves to the second area, the second safety light curtain 320 will generate a second detection signal. During the feeding or turning process, the operator is located in the second area, causing the second safety light curtain 320 to continuously generate a second detection signal. If the operator is about to be carried into the gap between the two rollers by the material, the operator's feet will leave the second area, causing the second detection signal generated by the second safety light curtain 320 to disappear. At the same time, the first safety light curtain 310 will not generate a first detection signal. This indicates that the operator is in danger, and the mixing mill 100 will quickly stop running to prevent the operator from suffering serious injury from the mixing mill 100, thereby protecting the operator's personal safety and improving the safety of the rubber mixing apparatus.

[0051] Understandably, for designs that place photoelectric protection devices such as safety light curtains or photoelectric switches above the roller 110 of the open mill 100 or on the side of the rubber baffle, the photoelectric protection devices may interfere with the rubber inlet position of the open mill 100. Moreover, when rubber accumulates, the high-temperature rubber is prone to collision and contact with the photoelectric protection devices, affecting the normal operation of the photoelectric protection devices, reducing the service life of the photoelectric protection devices, and even causing the photoelectric protection devices to fall and cause injury to personnel and equipment.

[0052] Compared to the design described above, this embodiment employs a dual-grating detection design with a first safety light curtain 310 and a second safety light curtain 320. This eliminates the need for operators to wear reflective wristbands, reducing the possibility of foreign matter contaminating the rubber compound. It also reduces the need for numerous control device access points, simplifying wiring. Furthermore, the safe and reasonable installation positions of the first and second safety light curtains 310 and 320 prevent interference with the rubber inlet position, effectively protecting operators and equipment. In addition, during automated production, if a sheet of rubber falls to the ground, the first safety light curtain 310 or the second safety light curtain 320 can quickly detect this, allowing the control device to stop the open mill 100 based on the first or second detection signal.

[0053] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the rubber milling apparatus also includes an alarm device 400, which is configured to emit at least one of an audible alarm and a visual alarm when a first detection signal changes from present to absent and a second detection signal is absent. If a control device is provided, the alarm device 400 can be electrically connected to the control device, allowing the alarm device 400 to operate under the control commands of the control device.

[0054] It is understood that the alarm device 400 can be an audible alarm, a visual alarm, or a combination of both. The alarm device 400 can be installed on the open mill 100, and its installation location can be selected according to actual needs. The alarm device 400 can issue an alarm message when the open mill 100 stops operating to ensure the personal safety of the operators, promptly notifying other staff to provide rescue and reassurance to the operators.

[0055] In one specific embodiment, the alarm device 400 is a warning light capable of emitting a light warning signal. Furthermore, the warning light is configured to emit a first light warning signal when a first detection signal is generated, and a second light warning signal when a second detection signal is generated. This design facilitates personnel around the equipment in knowing whether the operator is in a safe or dangerous area, and allows the operator to receive appropriate hazard warnings.

[0056] Furthermore, the warning light is configured to emit a third light warning signal when there are no first or second detection signals and the open mill 100 has not stopped. At this time, the warning light is a three-color warning light, and there are no operators at the loading area.

[0057] Understandably, the first light warning signal can be a yellow light, the second light warning signal can be a red light, and the third light warning signal can be a green light. If the operator's two feet are in the first and second zones respectively, both the first safety light curtain 310 and the second safety light curtain 320 will generate detection signals. At this time, the warning light will simultaneously emit the first and second light warning signals. Additionally, when the operator's foot triggers the second safety light curtain 320 to generate the second detection signal, the warning light can emit a flashing second light warning signal to more easily attract the operator's attention. Furthermore, when the first detection signal fades and the second detection signal disappears, the brake mechanism will operate and exert its braking effect. Simultaneously, the warning light, equipped with a buzzer, can emit an audible alarm signal and a second light warning signal.

[0058] In some embodiments, the first safety light curtain 310 and the second safety light curtain 320 are arranged vertically at intervals, and the first safety light curtain 310 and the second safety light curtain 320 are partially overlapped in a first direction. Therefore, the detection range of the first safety light curtain 310 and the detection range of the second safety light curtain 320 partially overlap.

[0059] Understandably, in some examples, the first safety light curtain 310 is located above the second safety light curtain 320. In other examples, the first safety light curtain 310 is located below the second safety light curtain 320. The overlapping portion of the first safety light curtain 310 and the second safety light curtain 320 can be set according to the actual situation. By adopting the above design, a certain distance of detection blind spot can be avoided when the first safety light curtain 310 and the second safety light curtain 320 are set on the same horizontal plane. If the operator's foot lands in the overlapping detection area between the first safety light curtain 310 and the second safety light curtain 320, both the first safety light curtain 310 and the second safety light curtain 320 will generate detection signals.

[0060] Of course, it is not ruled out that the first safety light curtain 310 and the second safety light curtain 320 are set along the same horizontal plane so that they are installed at the same height.

[0061] Furthermore, the dimension of the first safety light curtain 310 along the first direction is greater than the dimension of the second safety light curtain 320 along the first direction, that is, the length of the first safety light curtain 310 is greater than the length of the second safety light curtain 320. In this embodiment, the length of the first safety light curtain 310 is 1000mm, and the length of the second safety light curtain 320 is 400mm.

[0062] By setting up two detection zones of different lengths (long and short), the system can distinguish whether the operator is in a safe area or a danger zone. If the detection beam of the second safety light grating 320 is suddenly not blocked when the operator is in the danger zone, the open mill 100 will trigger a safety mechanism and quickly stop operating to prevent the operator from suffering mechanical injury from the open mill 100.

[0063] Of course, it is not excluded that in other embodiments, the size of the first safety light curtain 310 along the first direction is equal to or less than the size of the second safety light curtain 320 along the first direction.

[0064] In some embodiments, the rubber mixing apparatus further includes a support 200. The support 200 is provided on both sides of the feeding area along a second direction, and provides mounting positions and support for the first safety light curtain 310 and the second safety light curtain 320. The first safety light curtain 310 and the second safety light curtain 320 are mounted on the support 200 and fixed relative to the support 200.

[0065] It is understood that the specific structure of the bracket 200 is not limited. The transmitter of the first safety light curtain 310 and the transmitter of the second safety light curtain 320 are mounted on one side of the bracket 200, and the receiver of the first safety light curtain 310 and the receiver of the second safety light curtain 320 are mounted on the other side of the bracket 200, so that the transmitter and receiver are arranged at intervals along the second direction and are positioned opposite each other to complete the through-beam design arrangement.

[0066] In this embodiment, the support 200 includes a horizontal bar 210 and a vertical bar 220. The length of the horizontal bar 210 extends along a first direction, and the length of the vertical bar 220 extends along a vertical direction. One end of the horizontal bar 210 is fixedly connected to the vertical bar 220, and the other end of the horizontal bar 210 is directly connected to the open mill 100 or fixedly connected to another vertical bar 220. The horizontal bar 210 and the vertical bar 220 are perpendicularly connected. The lower end of the vertical bar 220 can directly abut against the ground or be fixed to the ground by expansion bolts. The transmitter and receiver of the first safety light curtain 310 and the transmitter and receiver of the second safety light curtain 320 are arranged on the corresponding horizontal bar 210 along the extension direction of the horizontal bar 210.

[0067] Furthermore, the support 200 is provided with a receiving groove 211, which is located on the side of the support 200 near the loading area along the second direction. The opening of the receiving groove 211 is open towards the second direction. The first safety light curtain 310 and the second safety light curtain 320 are disposed within the receiving groove 211. In this embodiment, the crossbar 210 is provided with the receiving groove 211. The crossbar 210 is a channel-shaped steel component. This arrangement can effectively protect the first safety light curtain 310 and the second safety light curtain 320, effectively preventing damage to the first safety light curtain 310 and the second safety light curtain 320 due to falling objects.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rubber open mixing apparatus, characterized in that, include: An open mill has two rollers with a feed inlet defined between them. The open mill is provided with a feeding zone located near the feed inlet. The feeding zone includes a first area and a second area that are connected to each other. The second area is located between the feed inlet and the first area. A first safety light curtain is disposed in the first area and configured to generate a first detection signal when the operator's feet are located in the first area; A second safety light curtain is disposed in the second area and configured to generate a second detection signal when the operator's feet are located in the second area; The open mill is configured to stop when the second detection signal changes from present to absent and the first detection signal is absent.

2. The rubber open mill apparatus according to claim 1, characterized in that, It also includes an alarm device configured to emit at least one of an audible alarm message and an optical alarm message when the first detection signal changes from present to absent and the second detection signal is absent.

3. The rubber open mill apparatus according to claim 2, characterized in that, The alarm device is a warning light, which is configured to emit a first light warning signal when the first detection signal is generated, and to emit a second light warning signal when the second detection signal is generated.

4. The rubber open mill apparatus according to claim 3, characterized in that, The warning light is also configured to emit a third light warning signal when there are no first detection signals and second detection signals and the open mill is not stopped.

5. The rubber open mill apparatus according to claim 1, characterized in that, The open mill has a brake mechanism configured to brake the twin rolls when the second detection signal changes from present to absent and the first detection signal is absent.

6. The rubber open mill apparatus according to claim 1, characterized in that, The first safety light curtain and the second safety light curtain are both located below the feed inlet. The first safety light curtain and the second safety light curtain are arranged sequentially along the first direction and are located on one side of the feed inlet along the first direction. The first safety light curtain and the second safety light curtain are both configured to emit a detection beam along the second direction. The first direction, the second direction and the up and down direction are perpendicular to each other.

7. The rubber open mill apparatus according to claim 6, characterized in that, Both the first and second safety light curtains are through-beam safety light curtains; and / or, The dimension of the first safety light curtain along the first direction is larger than the dimension of the second safety light curtain along the first direction; and / or, The second region and the feed inlet have a set distance in the first direction.

8. The rubber open mill apparatus according to claim 7, characterized in that, The first safety light curtain and the second safety light curtain are arranged vertically at intervals, and the detection range of the first safety light curtain partially overlaps with the detection range of the second safety light curtain.

9. The rubber open mill apparatus according to claim 8, characterized in that, The feeding area is provided with supports on both sides along the second direction, and the first safety light curtain and the second safety light curtain are provided on the supports.

10. The rubber open mill apparatus according to claim 9, characterized in that, The support has a receiving groove on the side of the support near the feeding area along the second direction. The opening of the receiving groove is open on the side of the second direction. The first safety light curtain and the second safety light curtain are disposed in the receiving groove.

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