Additional braking device, escalator and moving sidewalk

Abstract

The invention relates to an additional braking device, an escalator and a moving sidewalk, the additional braking device comprises a first gear, a braking mechanism and a driving mechanism, and the first gear is used for being connected with a driving main shaft and can synchronously rotate with the driving main shaft; the braking mechanism comprises a supporting base, a second gear and a braking assembly, the tooth number of the second gear is smaller than that of the first gear, the second gear is rotationally connected with the supporting base, and the braking assembly is connected with the second gear and used for limiting rotation of the second gear; the supporting seat is provided with a braking position and a separating position, and when the supporting seat is in the braking position, the second gear is meshed with the first gear; at the separation position, the second gear is separated from the first gear; the driving mechanism is connected with the supporting base and used for driving the supporting base to move between the braking position and the separation position. The additional brake is stable in braking process and convenient to maintain.

Description

Technical Field

[0001] The present application relates to the technical field of escalators and moving walkways, and in particular to an additional braking device, an escalator and a moving walkway. Background Art

[0002] The main function of the additional brake in an escalator or moving walkway is to brake in emergency situations such as drive chain break, overspeed, underspeed, reversal, etc.

[0003] In the related art, the braking force of the auxiliary brake is applied directly to the drive spindle. The braking process requires a large braking torque and a large instantaneous impact load, resulting in unstable braking. Furthermore, due to the large impact load, the strength requirements of the brake elements in the auxiliary brake are high, resulting in heavy components and high costs. Furthermore, due to structural limitations, the auxiliary brake in the related art can only be placed on the side of the step sprocket and truss, where there is little space for placement, making maintenance inconvenient. Furthermore, due to the limited space, it is difficult to effectively prevent the auxiliary brake from oiling. The drive spindle requires a large amount of lubricating oil, which can easily splash into or drift into the auxiliary brake in the form of oil mist, causing the auxiliary brake's braking capacity to decrease. Summary of the Invention

[0004] Based on this, it is necessary to provide an additional braking device, an escalator and a moving walkway to solve the problems of unstable braking and inconvenient maintenance of the current additional brake.

[0005] In a first aspect, the present application provides an additional braking device, comprising:

[0006] a first gear, the first gear being connected to the driving main shaft and capable of rotating synchronously with the driving main shaft;

[0007] A braking mechanism comprising a support base, a second gear, and a braking assembly, wherein the second gear has fewer teeth than the first gear, the second gear is rotatably connected to the support base, and the braking assembly is connected to the second gear, and the braking assembly is used to limit the rotation of the second gear; the support base has a braking position and a disengaging position, wherein in the braking position, the second gear is engaged with the first gear; and in the disengaging position, the second gear is disengaged from the first gear;

[0008] A driving mechanism is connected to the support base, and is used to drive the support base to transfer between the braking position and the separation position.

[0009] The technical solution is further described below:

[0010] In one embodiment, the brake assembly includes:

[0011] a rotating shaft, the rotating shaft being rotatably disposed on the supporting base and connected to the second gear;

[0012] a friction disc, the friction disc being connected to the rotating shaft and being capable of rotating synchronously with the rotating shaft;

[0013] A friction assembly is mounted on the support seat and is in contact with the friction disc.

[0014] In one embodiment, the second gear is located on one side of the support seat, the friction plate is located on the other side of the support seat, the rotating shaft passes through the support seat, and one end of the rotating shaft is fixedly connected to the second gear, and the other end of the rotating shaft is fixedly connected to the friction plate.

[0015] In one embodiment, the friction assembly includes a pressure plate, which is mounted on the support seat via a fastening assembly, and the pressure plate is in abutment with a side of the friction disc facing away from the support seat.

[0016] In one embodiment, a first friction plate is provided between the friction disc and the pressure plate; and / or a second friction plate is provided between the friction disc and the support seat.

[0017] In one embodiment, the friction assembly further includes a first elastic member, which is disposed on the fastening assembly and abuts against a side of the pressure plate facing away from the friction disc, and is used to drive the pressure plate to be pressed against the friction disc.

[0018] In one embodiment, the additional braking device further includes a guide rail member, the guide rail member is provided with a slide groove, at least a portion of the support seat is disposed in the slide groove, and the support seat can move along the slide groove between the braking position and the separation position under the drive of a driving mechanism.

[0019] In one embodiment, the driving mechanism includes a second elastic member and an electromagnetic driving member, and the second elastic member and the electromagnetic driving member are respectively connected to opposite ends of the support seat in a one-to-one correspondence; the electromagnetic driving member is configured as follows: when an electrical signal is received, the electromagnetic driving member drives the support seat to resist the elastic force of the second elastic member to enter and maintain the separation position; when the electrical signal is lost, the electromagnetic driving member releases the support seat, so that the support seat enters and maintains the braking position under the elastic force of the second elastic member.

[0020] In a second aspect, the present application provides an escalator comprising the above-mentioned additional braking device.

[0021] In a third aspect, the present application provides a moving walkway comprising the above-mentioned additional braking device.

[0022] The additional braking device, escalator and moving walk of the present application have at least the following beneficial effects:

[0023] First, because the second gear has fewer teeth than the first gear, during the braking process, after the second gear meshes with the first gear, the speed of the second gear is greater than that of the first gear. Based on the principle that speed and torque are inversely proportional when power is constant, the torque required to brake the second gear is less than the torque required to directly brake the drive shaft. Therefore, after adopting the above-mentioned additional braking device, the braking torque required for the escalator or moving walkway in an emergency is smaller, the impact generated by braking is smaller, and the braking process is smoother.

[0024] Second, because the impact load generated by braking is small, the strength requirements of the components in the auxiliary braking device can be effectively reduced, thereby reducing material costs. Furthermore, during normal operation of the escalator or moving walkway, the second gear is separated from the first gear, eliminating the need to consider noise, lubrication, and other issues, further reducing costs.

[0025] 3. When the escalator or moving walkway is operating normally, the second gear is separated from the first gear and the additional braking device does not participate in braking. The second gear engages with the first gear for braking only under abnormal conditions such as overspeed, underspeed or reversal. Therefore, there is no need to consider the load fatigue life of the gear pair, and only the braking strength needs to be checked. Therefore, a miniaturized design can be used to reduce the space occupied by the additional braking device. In this way, the additional braking device can be arranged in the upper machine room for easy daily maintenance.

[0026] Fourth, since the additional braking device does not need to directly apply braking force to the drive sprocket, the additional braking device can be arranged away from the drive sprocket, which can effectively prevent the lubricating oil on the drive sprocket from splashing into the brake mechanism, thereby avoiding the adverse effect of the reduction of braking torque due to the infiltration of lubricating oil into the brake mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only for illustrative purposes and are not necessarily drawn to true scale.

[0030] Figure 1 Schematic diagram of the structure of an additional braking device according to an embodiment.

[0031] Figure 2 for Figure 1 Schematic diagram of the structure of the additional braking device shown in another perspective.

[0032] Figure 3 This is a schematic structural diagram of a support base of an additional braking device in a separated position according to an embodiment.

[0033] Figure 4 This is a schematic structural diagram of a support base of an additional braking device in a braking position according to an embodiment.

[0034] Figure 5 Schematic diagram of the structure of the braking mechanism of the additional braking device of one embodiment.

[0035] Figure 6 for Figure 5 A front view of the brake mechanism of the braking device shown in FIG.

[0036] Figure 7 for Figure 6 Cross-sectional view of the braking mechanism of the intermediate braking device along section AA.

[0037] Description of Reference Numerals

[0038] 11. Driving spindle; 12. Driving sprocket; 21. First gear; 22. Braking mechanism; 221. Second gear; 222. Support seat; 223. Friction disc; 224. Rotating shaft; 225. Pressure plate; 2261. First friction plate; 2262. Second friction plate; 227. Fastening assembly; 228. First elastic member; 229. Guide rail member; 2291. Slide groove; 23. Driving mechanism; 231. Electromagnetic driving member; 232. Second elastic member. DETAILED DESCRIPTION

[0039] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0042] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0045] An embodiment of the present application provides an additional braking device that can be used in an escalator or a moving walkway to brake the escalator or moving walkway in emergency situations such as drive chain breakage, overspeed, underspeed, or reversal.

[0046] Specifically, see Figure 1 as well as Figure 2 The braking device of one embodiment includes a first gear 21, a braking mechanism 22 and a driving mechanism 23.

[0047] See also Figure 1 The first gear 21 is connected to the drive shaft 11 and can rotate synchronously with the drive shaft 11. Specifically, the drive shaft 11 is used to drive the escalator or moving walkway. The drive shaft 11 can be equipped with a drive sprocket 12, which can cooperate with the chain to drive the escalator or moving walkway. For example, in one embodiment, the drive sprocket 12 is mounted on one end of the drive shaft 11, and the first gear 21 is mounted on the other end of the drive shaft 11.

[0048] See also Figures 5 to 7 The brake mechanism 22 includes a support base 222, a second gear 221, and a brake assembly. The second gear 221 has fewer teeth than the first gear 21; in other words, the second gear 221 is a small gear, while the first gear 21 is a large gear. The second gear 221 is rotationally connected to the support base 222. The brake assembly is connected to the second gear 221 and is used to limit the rotation of the second gear 221; illustratively, the brake assembly can limit the rotation of the second gear 221 through friction.

[0049] The support base 222 is movably provided, and has a braking position and a separation position. Figure 4 , when in the braking position, the second gear 221 is meshed with the first gear 21; combined Figure 3 In the separation position, the second gear 221 is separated from the first gear 21.

[0050] See also Figure 2The driving mechanism 23 is connected to the support seat 222 , and the driving mechanism 23 is used to drive the support seat 222 to transfer between the braking position and the separation position, so that the second gear 221 is engaged with or separated from the first gear 21 .

[0051] In the aforementioned additional braking device, when the escalator or moving walkway is operating normally, the drive mechanism 23 maintains the support base 222 in the disengaged position. At this point, the second gear 221 is disengaged from the first gear 21, and the braking device does not brake the drive spindle 11, allowing the drive spindle 11 to drive the escalator or moving walkway normally. In the event of an emergency such as a drive chain break, overspeed, underspeed, or reverse motion, the drive mechanism 23 drives the support base 222 into and maintains the braking position. The second gear 221 meshes with the first gear 21, and the brake assembly restricts the rotation of the second gear 221, thereby braking the drive spindle 11 and bringing the escalator or moving walkway to a timely stop.

[0052] Since the second gear 221 has fewer teeth than the first gear 21, during the braking process, after the second gear 221 meshes with the first gear 21, the speed of the second gear 221 is greater than the speed of the first gear 21. According to the principle that when the power is constant, the speed and torque are inversely proportional, the torque required to brake the second gear 221 is less than the torque required to directly brake the drive shaft 11. Therefore, after adopting the above-mentioned additional braking device, the braking torque required for the escalator or moving walkway in an emergency is smaller, the impact generated by braking is smaller, and the braking process is smoother.

[0053] Furthermore, since the impact load generated by braking is small, the strength requirements of the components in the auxiliary braking device can be effectively reduced, thereby reducing material costs. Furthermore, during normal operation of the escalator or moving walkway, the second gear 221 is separated from the first gear 21, eliminating the need to consider noise, lubrication, and other issues, further reducing costs.

[0054] At the same time, when the escalator or moving walkway is operating normally, the second gear 221 is separated from the first gear 21, and the additional braking device does not participate in braking. The second gear 221 engages with the first gear 21 for braking only under abnormal conditions such as overspeed, underspeed or reversal. Therefore, there is no need to consider the load fatigue life of the gear pair, and only the strength during braking needs to be checked. Therefore, a miniaturized design can be made to reduce the space occupied by the additional braking device. In this way, the additional braking device can be arranged in the upper machine room for easy daily maintenance.

[0055] In addition, since the additional braking device does not need to directly apply braking force to the drive sprocket 12, the additional braking device can be arranged away from the drive sprocket 12, which can effectively prevent the lubricating oil on the drive sprocket 12 from splashing into the braking mechanism 22, thereby avoiding the adverse effect of the reduction of braking torque due to the lubricating oil seeping into the braking mechanism 22.

[0056] See also Figure 7 In some embodiments, the brake assembly includes a rotating shaft 224, a friction disc 223, and a friction assembly. The rotating shaft 224 is rotatably mounted on a support base 222 and connected to a second gear 221, allowing the second gear 221 to rotate relative to the support base 222. The friction disc 223 is connected to the rotating shaft 224 and can rotate synchronously with the rotating shaft 224. The friction assembly is mounted on the support base 222 and contacts and engages with the friction disc 223.

[0057] In this way, when the escalator or moving walkway needs emergency braking, the driving mechanism 23 drives the support seat 222 to enter the braking position, so that the second gear 221 is engaged with the first gear 21. Since the friction component is in contact with the friction disk 223, the friction force between the friction component and the friction disk 223 can limit the rotation of the friction disk 223, thereby limiting the rotation of the rotating shaft 224 and the second gear 221. The second gear 221 then limits the rotation of the first gear 21 and the driving spindle 11, thereby achieving emergency braking of the escalator or moving walkway.

[0058] See also Figure 7 In some embodiments, the second gear 221 is located on one side of the support seat 222, and the friction plate 223 is located on the other side of the support seat 222; by arranging the second gear 221 and the friction plate 223 on opposite sides of the support seat 222, respectively, it is convenient to set the friction assembly and the friction plate 223 in contact with each other.

[0059] Furthermore, the rotating shaft 224 passes through the support base 222, and one end of the rotating shaft 224 is fixedly connected to the second gear 221, and the other end of the rotating shaft 224 is fixedly connected to the friction plate 223, thereby ensuring that the friction plate 223 rotates synchronously with the second gear 221. For example, one end of the rotating shaft 224 is connected to the second gear 221 via a flat key, and the other end of the rotating shaft 224 is connected to the friction plate 223 via a flat key, so that the rotating shaft 224, the second gear 221, and the friction plate 223 form an integral body.

[0060] Continue to see Figure 7 In some embodiments, the friction assembly includes a pressure plate 225, which is mounted on the support seat 222 via a fastening assembly 227. The pressure plate 225 abuts and engages with the side of the friction disc 223 facing away from the support seat 222. For example, the fastening assembly 227 may include a bolt and a nut. By inserting the bolt through the pressure plate 225 and the support seat 222 and then tightening the nut, the pressure plate 225 can be mounted on the support seat 222 and abutted against the friction disc 223.

[0061] In this way, the friction disc 223 can be clamped between the pressure plate 225 and the support seat 222 , and the friction disc 223 can be braked by utilizing the friction force between the friction disc 223 and the pressure plate 225 and the friction force between the friction disc 223 and the support seat 222 .

[0062] See also Figure 7 In some embodiments, a first friction plate 2261 is disposed between the friction disc 223 and the pressure plate 225. For example, in one embodiment, the first friction plate 2261 may be fixed to the surface of the friction disc 223 near the pressure plate 225. For example, the first friction plate 2261 may be fixed to the surface of the friction disc 223 near the pressure plate 225 by gluing or other methods. It is understood that in other embodiments, the first friction plate 2261 may also be fixed to the surface of the pressure plate 225 near the friction disc 223. Furthermore, the first friction plate 2261 is made of a material with a high coefficient of friction, such as silicone or rubber. This increases the friction between the friction disc 223 and the pressure plate 225, thereby improving the braking effect on the friction disc 223.

[0063] Similarly, in one embodiment, a second friction plate 2262 is disposed between the friction disc 223 and the support base 222. For example, in one embodiment, the second friction plate 2262 may be fixed to a side surface of the friction disc 223 proximate to the support base 222. For example, the second friction plate 2262 may be fixed to a side surface of the friction disc 223 proximate to the support base 222 by gluing or other methods. It is understood that in other embodiments, the second friction plate 2262 may also be fixed to a side surface of the support base proximate to the friction disc 223. Furthermore, the second friction plate 2262 may be made of a material with a high coefficient of friction, such as silicone or rubber. This increases the friction between the friction disc 223 and the support base 222, thereby enhancing the braking effect on the friction disc 223.

[0064] See also Figure 7 In some embodiments, the friction assembly further includes a first elastic member 228. The first elastic member 228 is disposed on the fastening assembly 227 and abuts against a side of the pressure plate 225 facing away from the friction disc 223. The first elastic member 228 is used to force the pressure plate 225 to press against the friction disc 223. For example, the first elastic member 228 may be a disc spring. The first elastic member 228 can apply a pressing force toward the friction disc 223 to the pressure plate 225, ensuring full contact between the pressure plate 225 and the friction disc 223, thereby maintaining the friction torque between the pressure plate 225 and the friction disc 223.

[0065] Illustratively, the pressure plate 225 is provided with a plurality of fastening assemblies 227, which are spaced apart along the circumference of the pressure plate 225. Correspondingly, each fastening assembly 227 is provided with a first elastic member 228. The plurality of first elastic members 228 collectively compress the pressure plate 225, further enhancing the braking effect of the pressure plate 225 on the friction disc 223.

[0066] See also Figure 5 In one embodiment, the additional braking device further includes a guide rail 229 having a slide groove 2291. At least a portion of the support seat 222 is disposed in the slide groove 2291. Driven by the drive mechanism 23, the support seat 222 can move along the slide groove 2291 between a braking position and a disengaged position. The guide rail 229 ensures smooth movement of the support seat 222 by guiding the support seat 222.

[0067] See also Figure 3 as well as Figure 4 In some embodiments, the driving mechanism 23 includes a second elastic member 232 and an electromagnetic driving member 231. The second elastic member 232 and the electromagnetic driving member 231 are connected to opposite ends of the support base 222 in a one-to-one correspondence. When the electromagnetic driving member 231 receives an electrical signal, the electromagnetic driving member 231 drives the support base 222 to resist the elastic force of the second elastic member 232 and enter and maintain it in the separated position. When the electromagnetic driving member 231 loses the electrical signal, the electromagnetic driving member 231 releases the support base 222, so that the support base 222 is driven by the elastic force of the second elastic member 232 to enter and maintain it in the braking position.

[0068] Specifically, when the escalator or moving walkway is working normally, the electromagnetic drive component 231 receives an electrical signal, and the push rod of the electromagnetic drive component 231 extends to drive the support seat 222 to maintain in the separated position. At this time, the second elastic component 232 is compressed, and the first gear 21 is separated from the second gear 221. The braking device will not brake the drive shaft 11, and the drive shaft 11 can drive the escalator or moving walkway to operate normally.

[0069] When the escalator or moving walkway encounters an emergency situation such as drive chain breakage, overspeed, underspeed, reversal, etc., the electromagnetic drive component 231 loses the electrical signal, and the subsequent push rod retracts. At this time, the second elastic component 232 releases the elastic force to drive the support seat 222 to enter and maintain the braking position. At this time, the second gear 221 is engaged with the first gear 21, and the rotation of the second gear 221 is restricted by the brake assembly, thereby braking the drive spindle 11, and then stopping the escalator or moving walkway in time.

[0070] It is understandable that in other embodiments, the driving mechanism 23 can be an electric push rod or a cylinder, etc., as long as it can maintain the support base 222 in the separated position when the escalator or moving walkway is working normally, and drive the support base 222 to move to the braking position in an emergency, without limitation here.

[0071] In a second aspect, the present application further provides an escalator. The escalator in one embodiment includes the additional braking device of any one of the above embodiments.

[0072] In a third aspect, the present application further provides a moving walkway. The moving walkway in one embodiment includes the additional braking device of any of the above embodiments.

[0073] In the aforementioned escalator or moving walkway, during normal operation, the drive mechanism 23 maintains the support base 222 in the disengaged position. At this point, the second gear 221 is disengaged from the first gear 21, and the braking device does not brake the drive spindle 11, allowing the drive spindle 11 to drive the escalator or moving walkway normally. In the event of an emergency situation such as a drive chain break, overspeed, underspeed, or reverse rotation, the drive mechanism 23 drives the support base 222 into and maintains the braking position. The second gear 221 meshes with the first gear 21, and the brake assembly restricts the rotation of the second gear 221, thereby braking the drive spindle 11 and bringing the escalator or moving walkway to a timely stop.

[0074] Since the second gear 221 has fewer teeth than the first gear 21, during the braking process, after the second gear 221 meshes with the first gear 21, the speed of the second gear 221 is greater than the speed of the first gear 21. According to the principle that when the power is constant, the speed and torque are inversely proportional, the torque required to brake the second gear 221 is less than the torque required to directly brake the drive shaft 11. Therefore, after adopting the above-mentioned additional braking device, the braking torque required for the escalator or moving walkway in an emergency is smaller, the impact generated by braking is smaller, and the braking process is smoother.

[0075] Furthermore, since the impact load generated by braking is small, the strength requirements of the components in the auxiliary braking device can be effectively reduced, thereby reducing material costs. Furthermore, during normal operation of the escalator or moving walkway, the second gear 221 is separated from the first gear 21, eliminating the need to consider noise, lubrication, and other issues, further reducing costs.

[0076] At the same time, when the escalator or moving walkway is operating normally, the second gear 221 is separated from the first gear 21, and the additional braking device does not participate in braking; the second gear 221 engages with the first gear 21 for braking only under abnormal conditions such as overspeed, underspeed or reversal, so there is no need to consider the load fatigue life of the gear pair, and only the strength during braking needs to be checked. Therefore, a miniaturized design can be used to reduce the space occupied by the additional braking device. In this way, the additional braking device can be arranged in the upper machine room for easy daily maintenance.

[0077] In addition, since the additional braking device does not need to directly apply braking force to the drive sprocket 12, the additional braking device can be arranged away from the drive sprocket 12, which can effectively prevent the lubricating oil on the drive sprocket 12 from splashing into the braking mechanism 22, thereby avoiding the adverse effect of a decrease in braking torque due to the lubricating oil seeping into the braking mechanism 22.

[0078] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An additional braking device, characterized in that: include: a first gear, the first gear being connected to the driving main shaft and capable of rotating synchronously with the driving main shaft; A braking mechanism comprising a support base, a second gear, and a braking assembly, wherein the second gear has fewer teeth than the first gear, the second gear is rotatably connected to the support base, and the braking assembly is connected to the second gear, and the braking assembly is used to limit the rotation of the second gear; the support base is movably arranged, and the support base has a braking position and a disengagement position, and when in the braking position, the second gear is meshed with the first gear; In the disengaged position, the second gear is disengaged from the first gear; A driving mechanism is connected to the support base, and is used to drive the support base to transfer between the braking position and the separation position.

2. The additional braking device according to claim 1, characterized in that The brake assembly comprises: a rotating shaft, the rotating shaft being rotatably disposed on the supporting base and connected to the second gear; a friction disc, the friction disc being connected to the rotating shaft and being capable of rotating synchronously with the rotating shaft; A friction assembly is mounted on the support seat and is in contact with the friction disc.

3. The additional braking device according to claim 2, characterized in that: The second gear is located on one side of the support seat, the friction plate is located on the other side of the support seat, the rotating shaft passes through the support seat, and one end of the rotating shaft is fixedly connected to the second gear, and the other end of the rotating shaft is fixedly connected to the friction plate.

4. The additional braking device according to claim 3, characterized in that: The friction assembly includes a pressure plate, which is mounted on the support seat through a fastening assembly. The pressure plate is in abutment with a side of the friction disc facing away from the support seat.

5. The additional braking device according to claim 4, characterized in that: A first friction plate is provided between the friction disc and the pressure plate; and / or a second friction plate is provided between the friction disc and the support seat.

6. The additional braking device according to claim 4, characterized in that: The friction assembly further includes a first elastic member, which is disposed on the fastening assembly and abuts against a side of the pressure plate facing away from the friction disc. The first elastic member is used to drive the pressure plate to press against the friction disc.

7. The additional braking device according to claim 1, characterized in that: The additional braking device further comprises a guide rail member, which is provided with a slide groove, in which at least a portion of the support seat is disposed, and the support seat can move along the slide groove between the braking position and the separation position under the drive of a driving mechanism.

8. The additional braking device according to any one of claims 1 to 7, characterized in that: The driving mechanism includes a second elastic member and an electromagnetic driving member, and the second elastic member and the electromagnetic driving member are respectively connected to the opposite ends of the support seat in a one-to-one correspondence; the electromagnetic driving member is configured as follows: when an electrical signal is received, the electromagnetic driving member drives the support seat to resist the elastic force of the second elastic member to enter and maintain the separation position; when the electrical signal is lost, the electromagnetic driving member releases the support seat, so that the support seat enters and maintains the braking position under the elastic force of the second elastic member.

9. An escalator, characterized in that: The invention comprises the additional braking device according to any one of claims 1 to 8.

10. A moving walkway, characterized in that: The invention comprises the additional braking device according to any one of claims 1 to 8.

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