A safety protection device for multi-car parallel elevators

Abstract

The present invention provides a safety protection device for a multi-car parallel elevator, wherein the car runs along a guide rail, the safety protection device is installed on a suspension, the suspension is connected to the car, the safety protection device includes a speed limiter and a safety clamp, the speed limiter and the safety clamp are connected, the speed limiter includes a speed taking unit and a mechanical action unit connected to each other, the speed taking unit rolls along the guide rail, and when the speed of the speed taking unit exceeds a set value, the mechanical action unit is triggered, and the mechanical action unit drives the safety clamp to clamp the guide rail. The present invention performs deceleration and stopping protection on the overspeeding car in two ways, thereby improving the reliability of deceleration and stopping, and the suspension protection device performs suspension protection on the car, thereby further improving the safety of the car operation.

Description

Technical Field

[0001] The invention belongs to the technical field of elevators, and in particular relates to a safety protection device for multi-car parallel elevators. Background Art

[0002] In modern society and economic activities, elevators have become an indispensable means of vertical transportation for people or goods. Since the invention of the elevator in 1854, the elevator car has been driven by a wire rope pulley. The machine room, traction motor and reduction device are set on the top floor of the building to drive the wire rope to pull the car and counterweight to run on the track in the shaft. This driving method usually allows only one car to run in a single shaft. Elevators in a single-car operation mode can still meet the use needs in low-rise buildings and floors with low passenger flow. With the rapid development of modern cities, high-rise buildings and super-high-rise buildings with high population density have sprung up. The shortcomings of elevators in a single-car operation mode, such as long waiting time and low transportation efficiency, have been continuously magnified. This traditional single-car elevator operation mode has been difficult to adapt to the needs of the rapid development of modern urban buildings.

[0003] In order to improve the utilization rate of building space and the efficiency of elevator transportation, and reduce the cost of buildings and elevators, with the continuous development of engineering technology, a multi-car parallel elevator is being developed and applied. The multi-car parallel elevator adopts the direct drive technology without traction wire rope, which enables multiple elevators to run simultaneously in the same shaft, and the elevators between the shafts can switch shafts to achieve overtaking operation. However, the traditional safety protection device composed of the speed limiter installed in the machine room, the safety clamp fixed on the car frame, and the speed limiter wire rope running through the entire shaft can only achieve overspeed protection on the vertical track of a single shaft, and cannot meet the application requirements of multi-car parallel elevators. At the same time, the multi-car elevator achieves the effect of interoperable operation of multiple elevator tracks through track switching. When the track switching is working, the original track will have a suspended distance in the track switching section, which is bound to cause safety hazards to other cars on the original track. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a safety protection device for multi-car parallel elevators, which can decelerate and stop the overspeeding car in two ways: by driving the trigger ring with the speed limiter wheel and by driving the trigger ring with the active action unit, thereby improving the reliability of deceleration and stopping. A suspension protection device is provided to protect the car from being suspended in the air and prevent the car from falling, thereby further improving the safety of the car operation.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A safety protection device for a multi-car parallel elevator, wherein the car runs along a guide rail, the safety protection device is installed on a suspension, the suspension and the car are connected, the safety protection device includes a speed limiter and a safety clamp, the speed limiter and the safety clamp are connected, the speed limiter includes a speed taking unit and a mechanical action unit connected to each other, the speed taking unit rolls along the guide rail, when the speed of the speed taking unit exceeds a set value, the mechanical action unit is triggered, and the mechanical action unit drives the safety clamp to clamp the guide rail.

[0007] As a further improvement of the above technical solution:

[0008] The safety protection device also includes an active action unit, which is connected to the mechanical action unit and is also electrically connected to the monitoring and control system of the elevator. When the car running speed monitored by the monitoring and control system exceeds the set value and the speed taking unit of the speed limiter does not trigger the mechanical action unit, the monitoring and control system starts the active action unit, and the active action unit triggers the mechanical action unit, so that the mechanical action unit drives the safety clamp to clamp the guide rail.

[0009] The safety protection device also includes an action detection unit, which is electrically connected to the monitoring and control system. The action detection unit is a normally closed safety switch, which is installed on the safety clamp. When the safety clamp moves the clamping guide rail, its action will be triggered, causing the normally closed contacts of the normally closed safety switch to become normally open contacts, thereby disconnecting the electrical circuit.

[0010] The safety protection device also includes a lifting member, which is a flexible rope. The two ends of the lifting member are respectively connected to the speed limiter and the safety clamp. The speed limiter is wound around the lifting member to trigger the action of the safety clamp.

[0011] The speed taking unit includes a speed limiter wheel, which rolls along the guide rail. The speed triggering unit includes a centrifugal block, which is located on one end face of the speed limiter wheel. When the car running speed exceeds the set value, the centrifugal block undergoes centrifugal motion and triggers the mechanical action unit.

[0012] The safety protection device also includes an electrical action unit. When the speed of the speed acquisition unit exceeds a set value, the speed trigger unit triggers the electrical action unit and the mechanical action unit in sequence.

[0013] The electrical action unit is a normally closed safety switch connected in series to the electrical circuit of the elevator. After the speed trigger unit triggers the electrical action unit, the electrical action unit is disconnected.

[0014] The speed limiter also includes a mounting body, which is the base of the speed limiter, and the speed taking unit is rotatably mounted on the mounting body.

[0015] The mechanical action unit includes a trigger ring and at least one trigger ring damper. The trigger ring is rotatably mounted on the mounting body. The trigger ring damper for stabilizing the trigger ring is mounted on the mounting body. One end of the lifting member is fixed on the trigger ring and the other end is connected to the safety clamp. When the centrifugal block undergoes centrifugal motion, it will drive the trigger ring to rotate and wind the lifting member.

[0016] The active action unit is a motor, which is connected to a trigger ring. After the motor is started, the trigger ring can be driven to rotate, and the trigger ring rotates to wind up the lifting member.

[0017] A backstop is provided on the active action unit. When the trigger ring rotates, the trigger ring cannot drive the active action unit to rotate. The movement of the active action unit can drive the trigger ring to rotate.

[0018] The centrifugal block comprises a large head end and a small head end which are integrally connected, and the middle part of the centrifugal block is hinged on the speed limiter wheel through a hinged joint.

[0019] There are two centrifugal blocks, and the speed trigger unit also includes a linkage rod and a tension spring. The two centrifugal blocks are arranged on the same end face of the speed limiter wheel in a centrally symmetrical manner relative to the rotation axis of the speed limiter wheel. One end of the tension spring is fixedly connected to the end face, and the other end is connected to the large end of one centrifugal block. The small end of this centrifugal block is connected to the large end of another centrifugal block through a linkage rod.

[0020] The speed trigger unit also includes a mechanical trigger block, which is hinged on the speed limiter wheel and is located on the same end face as the centrifugal block. When the centrifugal block undergoes centrifugal motion, it hits the mechanical trigger block, and the mechanical trigger block triggers the mechanical action unit.

[0021] The mechanical trigger block includes a trigger limit block, a trigger limit block reset spring, a pawl, a pawl reset spring and two limit blocks. The trigger limit block is hinged on the speed limiter wheel and is located on the same end face as the centrifugal block. It can rotate in a plane parallel to the end face. The trigger limit block reset spring is a torsion spring that limits the rotation range of the trigger limit block. Two limit blocks that are respectively used to limit the rotation range of the trigger limit block and the pawl are fixed on the speed limiter wheel. When the trigger limit block contacts one limit block, the trigger limit block reset spring is in In a state with elastic potential energy, one end of the pawl is hinged on the speed limiter wheel, the pawl and the centrifugal block are located on the same end face, and can rotate around the hinged end in a plane parallel to the end face. The pawl reset spring is a torsion spring that limits the rotation range of the pawl. The other end of the pawl can contact the trigger limit block. When the pawl contacts the trigger limit block, the pawl reset spring is in a state with elastic potential energy. When the pawl disengages from the trigger limit block, the pawl rotates clockwise under the action of the pawl reset spring until it is blocked by the limit block.

[0022] The trigger ring is a ring-shaped ratchet structure, and the teeth of the ratchet are installed on the inner side of the trigger ring. When the pawl disengages from the trigger limit block, the pawl touches the teeth of the trigger ring.

[0023] The suspension is provided with two sets of guide and limit wheel groups arranged at intervals, each set of guide and limit wheel groups includes two guide wheels, and the two guide wheels of each set of guide and limit wheel groups are clamped on both sides of one side of the guide rail. The guide and limit wheel groups guide the car to run along the track of the guide rail, driving the suspension to adapt to the changing direction of the guide rail.

[0024] The safety clamp includes a safety clamp seat, a stationary wedge and a dynamic wedge. The safety clamp seat is fixedly installed on the suspension. The dynamic wedge and the stationary wedge are both wedge-shaped. The inclined surfaces of the dynamic wedge and the stationary wedge cooperate with each other. The lifting piece is connected and drives the dynamic wedge to move, so that the dynamic wedge moves toward the guide rail to contact and press the side of the guide rail. The safety clamp is a single-braking-surface safety clamp. The guide limiting wheel group guides the suspension and the dynamic wedge to adapt to the changing direction of the guide rail, so that the dynamic wedge is in full contact with the guide rail surface when the safety clamp is actuated.

[0025] The safety clamp seat has a U-shaped opening, and the static wedge and the dynamic wedge are located in the U-shaped opening of the safety clamp seat. The static wedge is fixedly installed on the safety clamp seat, and the dynamic wedge is located between the static wedge and the guide rail. Along the downward running direction of the car, the dynamic wedge is small at the top and large at the bottom, and the static wedge is large at the top and small at the bottom.

[0026] The side of the stationary wedge block opposite to its inclined surface is a vertical surface, and the side of the moving wedge block opposite to its inclined surface is a vertical surface. When the car is on the vertical guide rail in the hoistway, the vertical surfaces of the stationary wedge block and the moving wedge block are parallel to the guide rail.

[0027] An elastic buffer element is added between the stationary wedge and the safety clamp seat.

[0028] A return spring is arranged between the bottom surface of the moving wedge and the safety clamp seat.

[0029] A plurality of rolling bodies are arranged between the stationary wedge block and the moving wedge block.

[0030] A slide groove is arranged on the upper side of the moving wedge block, the length direction of the slide groove is parallel to the running direction of the moving wedge block toward or away from the guide rail, and one end of the lifting member is slidably arranged in the slide groove.

[0031] The elevator comprises a switching mechanism, the guide rail comprises a movable active rail and a fixed upper car rail and a fixed lower car rail which are fixedly arranged at intervals on the same straight line, and the switching mechanism drives the movable rail to move in or out between the fixed upper car rail and the fixed lower car rail.

[0032] The safety protection device also includes a suspended protection device, which includes a mounting component, a driving component and a safety component. The safety component is fixedly arranged on the mounting component. One end of the driving component is fixed on the base, and the other end drives the mounting component to move until the safety component is connected to the lower end of the fixed upper car track or is moved away from the fixed upper car track.

[0033] The switching mechanism drives the movable track to move between the fixed upper car track and the fixed lower car track so that the three are connected into a continuous track. The elevator also includes a transition track, which includes a fixed transition track and a movable movable transition track. The switching mechanism drives the movable transition track to move between the fixed transition track and the fixed lower car track so that the three are connected into a continuous track, or drives the movable transition track to move out from between the fixed transition track and the fixed lower car track.

[0034] The suspension protection device also includes a buffer component, which is installed on the safety component.

[0035] The buffer component includes a buffer plate, multiple springs and multiple movable pins. The movable pin includes a large head end and a small head end. The outer diameter of the large head end is larger than the outer diameter of the small head end. The safety component includes a top. The top is provided with multiple holes with apertures not smaller than that of the small head end and smaller than that of the large head end. The small heads of the multiple movable pins pass through the multiple holes from bottom to top and are fixedly connected to the buffer plate. A spring is provided on the outside of each small head end. One end of the spring is fixedly connected to the buffer plate and the other end is connected to the top of the safety component.

[0036] The cushioning component is rubber.

[0037] The suspension protection device also includes multiple limit locking components, which include limit sliders, positioning pins and pushers. The multiple limit sliders of the multiple limit locking components are evenly fixed on the mounting components. The limit sliders are provided with positioning holes. The pusher is installed on the base. The driving end of the pusher is connected to and drives one end of the positioning pin. The outer diameter of the other end of the positioning pin is not larger than the aperture of the positioning hole.

[0038] The limiting sliding block is fixedly mounted on an end of the mounting component away from the driving component.

[0039] The safety component comprises a plurality of pins, and the lower end of the fixed upper car track is provided with pin holes matched with the plurality of pins, and the driving component drives the plurality of pins of the safety component to be inserted into or drawn out from the plurality of pin holes.

[0040] The beneficial effects of the present invention are:

[0041] 1) Compared with the traditional safety protection device where the speed limiter is in the machine room and the safety clamp is arranged in a dispersed manner on the car, the speed limiter and the safety clamp of the present invention are arranged in an integrated manner, which has a simple and compact structure, saves layout space and reduces costs;

[0042] 2) The traditional safety protection device can only be applied to the vertical track of a single shaft, while the present invention can be applied to the straight track and curved track of multiple shafts; the speed limiter does not need the steel wire rope and the steel wire rope tensioning mechanism running through the entire shaft;

[0043] 3) When the speed limiter triggers the safety clamp to operate, it is achieved by winding the lifting rope around the trigger ring. The trigger ring and one end of the lifting rope are fixedly connected, without slipping, and no large friction is required. At the same time, as the trigger ring rotates (the operation of the car), the lifting rope will gradually be tightened, increasing the lifting force and ensuring reliable operation.

[0044] 4) The safety clamp is a single-braking-surface safety clamp, which is equivalent to having only one brake block. It can achieve braking by clamping one side of the guide rail, and does not need to set a jaw to avoid the guide rail. The structure is simple and compact. When passing through an arc track, the braking surface of the safety clamp can be fully in contact with the guide rail surface when it is actuated, and the braking force is balanced, which has a better braking effect and higher safety performance.

[0045] 5) When the main track is in the switched suspended state, the car stop protection and brake fail or the elevator system logic control error causes unexpected movement or falling, the safety component blocks the suspended area of ​​the main track, thereby playing a braking function for the elevator that moves or falls unexpectedly;

[0046] 6) The suspended protection device is arranged in the track switching movable section, and can share driving components and installation components with the track switching module, and can flexibly link actions with the track switching, which can not only protect the suspended section of the track after switching, but also ensure that there is no interference with the operation of the elevator on the track before switching.

[0047] 7) The safety protection device is suitable for the operation of elevators without traction wire ropes, ensuring the safe operation of elevator cars without traction wire ropes. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the structure of the safety clamp of Embodiment 1 of the present invention which is not driven by the lifting member.

[0049] Figure 2 It is a schematic diagram of the structure of the safety clamp of the first embodiment of the present invention after being driven by the lifting member.

[0050] Figure 3 It is a schematic diagram of the structure of the speed limiter according to the first embodiment of the present invention.

[0051] Figure 4 It is a structural schematic diagram of a mechanical trigger block according to the first embodiment of the present invention.

[0052] Figure 5 It is a schematic structural diagram of the safety clamp according to the first embodiment of the present invention.

[0053] Figure 6 It is a structural diagram of embodiment 3 of the present invention.

[0054] Figure 7 It is a schematic diagram of the structure of the suspended protection device of the fourth embodiment of the present invention.

[0055] Figure 8 This is a schematic diagram of a safety component and a buffer component according to a fourth embodiment of the present invention.

[0056] Fig. 9 yes Figure 8 Schematic diagram of CC cross section.

[0057] Fig.10 Schematic diagram of the structure of the limit locking component of the fourth embodiment of the present invention.

[0058] Fig.11 This is a schematic diagram of the safety component structure of Embodiment 5 of the present invention. DETAILED DESCRIPTION

[0059] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0060] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0061] Embodiment 1

[0062] A safety protection device for a multi-car parallel elevator, such as Figures 1 to 5 As shown, the car runs along the guide rail 4, the safety protection device is installed on the suspension 3, the suspension 3 is connected to the car, and the safety protection device includes a speed limiter 1, a safety clamp 2, a lifting member 5, an electrical action unit 14 and an action detection unit.

[0063] The suspension 3 is provided with two sets of guide and limit wheel sets 31 arranged at intervals, each set of guide and limit wheel sets 31 includes two guide wheels, and the two guide wheels of each set of guide and limit wheel sets 31 are clamped on both sides of one side of the guide rail 4. The guide and limit wheel sets 31 guide the car to run along the track of the guide rail 4, drive the suspension 3 to adapt to the changing direction of the guide rail 4, and drive the speed limiter 1 and the safety clamp 2 to run synchronously, playing the role of guiding and limiting.

[0064] Speed ​​limiter 1 Figure 3 As shown, it includes a mounting body 11, a speed obtaining unit, a speed triggering unit and a mechanical action unit.

[0065] The mounting body 11 is the base of the speed limiter, and the mounting body 11 is mounted on the suspension 3 , that is, the speed limiter is mounted on the suspension 3 .

[0066] The speed taking unit includes a speed limiter wheel 121 and an axle 122. The axle 122 is fixedly mounted on the mounting body 11, and the speed limiter wheel 121 is mounted on the axle 122 through a bearing, that is, the speed limiter wheel 121 can rotate freely relative to the axle 122. The speed limiter wheel 121 is in direct contact with the guide rail. When the car moves, the speed limiter wheel 121 rolls along the guide rail through friction transmission. At this time, the speed limiter wheel 121 directly serves as a speed taking wheel.

[0067] The speed trigger unit includes a linkage rod 132, a mechanical trigger block, a tension spring 139, two centrifugal blocks 131 and a plurality of articulated joints 133. The mechanical trigger block includes a trigger limit block 134, a trigger limit block return spring 135, a pawl 137, a pawl return spring 138 and two limit blocks 136.

[0068] The two centrifugal blocks 131 are arranged on the same end face of the speed limiter wheel 121 in a centrally symmetrical manner relative to the rotation axis of the speed limiter wheel 121. The centrifugal block 131 includes a large end and a small end connected in one piece, and the middle part of the centrifugal block 131 is hinged on the speed limiter wheel 121 through a hinge joint 133, that is, the centrifugal block 131 can rotate around the hinge joint 133 in a plane parallel to the speed limiter wheel 121. One end of the tension spring 139 is fixedly connected to the end face, and the other end is connected to the large end of one centrifugal block 131, and the small end of this centrifugal block 131 is connected to the large end of another centrifugal block 131 through a linkage rod 132. The linkage rod 132 is rigid, and the two ends of the linkage rod 132 are respectively hinged to the two centrifugal blocks 131, so that the two centrifugal blocks 131 rotate synchronously. When the speed limiter wheel 121 rotates, in this embodiment, the rotation direction is clockwise, as shown by the arrow direction on the speed limiter wheel 121 in the attached figure, and the two centrifugal blocks 131 are driven to move; when the speed limiter wheel 121 rotates beyond a certain value, the centrifugal block 131 will undergo centrifugal motion, which is manifested as the centrifugal block 131 moving with the speed limiter wheel 121, and rotating with the articulated joint 133 as the central axis, and the rotation direction is clockwise, as shown by the arrow direction on the centrifugal block 131 in the attached figure, that is, the rotation direction is that the large end moves away from the rotation axis of the speed limiter wheel 121, and the tension spring 139 is stretched. The large end of the centrifugal block 131 triggers the electrical action unit 14 and the mechanical action unit to act successively. When the speed limiter wheel 121 rotates at different speeds, the centrifugal block 131 rotates at different angles around its articulated joint 133.

[0069] The trigger limit block 134 is hinged on the speed limiter wheel 121 and is located on the same end face as the centrifugal block 131, and can rotate in a plane parallel to the end face. The trigger limit block 134 includes two limit rods, which intersect at the hinge. The trigger limit block reset spring 135 is a torsion spring, which has a tendency to cause the trigger limit block 134 to rotate clockwise, as shown by the arrow direction on the side of the trigger limit block 134 in the attached figure. Two limit blocks 136 are fixed on the speed limiter wheel 121, respectively limiting the further rotation of the trigger limit block 134 and the ratchet 137. For the trigger limit block 134, when a limit rod of the trigger limit block 134 contacts a limit block 136, the trigger limit block reset spring 135 is not in a free state, but in a state with elastic potential energy. At this time, the distance between the limit rod of the trigger limit block 134 that does not contact the limit block 136 and the rotation axis of the speed limiter wheel 121 is smaller than the distance between the limit rod that contacts the limit block 136 and the rotation axis of the speed limiter wheel 121.

[0070] One end of the pawl 137 is hinged on the speed limiter wheel 121. The pawl 137 and the centrifugal block 131 are located on the same end face and can rotate around the hinged end in a plane parallel to the end face. The pawl reset spring 138 is a torsion spring, which has a tendency to cause the pawl 137 to rotate counterclockwise, as shown in the arrow direction on the side of the pawl 137 in the attached figure. The other end of the pawl 137 can contact the limit rod of the contact limit block 136 of the trigger limit block 134. At this time, the other ends of the limit block 136 and the pawl 137 are respectively located on both sides of the limit rod. When the other end of the pawl 137 contacts the limit rod, the pawl reset spring 138 is not in a free state, but in a state with elastic potential energy. The distance between the limit block 136 that limits the pawl 137 and the hinged end of the pawl 137 is smaller than the distance between the overhanging end of the pawl 137. When the pawl 137 disengages from the trigger limit block 134, the pawl 137 rotates counterclockwise under the action of the pawl return spring 138 until it is blocked by the limit block 136.

[0071] When the speed limiter wheel 121 rotates clockwise and the speed reaches a certain value, the centrifugal block 131 undergoes centrifugal motion, or when the large end of the centrifugal block 131 moves away from the rotation axis of the speed limiter wheel 121, it hits the limit rod of the trigger limit block 134 that does not contact the limit block 136, causing the trigger limit block 134 to rotate counterclockwise and disengage the pawl 137. The pawl 137 rotates counterclockwise under the elastic force of the pawl return spring 138 and is blocked by the limit block 136. As the speed limiter wheel 121 continues to rotate, the pawl 137 contacts the mechanical action unit.

[0072] The electrical action unit 14 is installed on the installation body 11. The electrical action unit 14 is a normally closed safety switch connected in series with the electrical circuit of the elevator. After the centrifugal block 131 hits the electrical action unit 14, the electrical action unit 14 is disconnected, that is, the normally closed safety switch of the electrical circuit is disconnected, and the elevator host stops running.

[0073] The distance between the electric action unit 14 and the rotation axis of the speed limiter wheel 121 is smaller than the distance between the trigger limit block 134 and the rotation axis of the speed limiter wheel 121. That is, when the speed limiter wheel 121 rotates clockwise, as the speed increases, the centrifugal block 131 first hits the electric action unit 14 and then hits the trigger limit block 134.

[0074] The mechanical action unit includes a trigger ring 151 and at least one trigger ring damper 152. The trigger ring 151 is an annular ratchet structure, and the teeth of the ratchet are installed on the inner side of the trigger ring 151. When the pawl 137 disengages the trigger limit block 134, the pawl 137 rotates counterclockwise under the elastic force of the pawl reset spring 138 and is blocked by the limit block 136. As the speed limiter wheel 121 continues to rotate clockwise, the pawl 137 touches the teeth of the trigger ring 151 and drives the trigger ring 151 to rotate clockwise. The trigger ring 151 is installed on the wheel shaft 122 through a bearing and can rotate freely relative to the wheel shaft 122. The trigger ring damper 152 is installed on the mounting body 11 and contacts the trigger ring 151, and is used to achieve stability of the trigger ring 151 to ensure that it does not rotate when it is not driven by the pawl 137.

[0075] One end of the lifting member 5 is fixed on the trigger ring 151, and the other end is connected to the safety clamp. Preferably, the lifting member 5 is a flexible rope, and when the trigger ring 151 rotates, the lifting member 5 can be wound around the trigger ring 151, and the other end of the lifting member 5 can pull and trigger the safety clamp to clamp the guide rail and stop the elevator.

[0076] If affected by the arrangement, a guide wheel 153 can be added to the path of the lifting member 5 to change the direction of the lifting member 5 to achieve lifting in different directions, so that the arrangement relationship between the speed limiter 1 and the safety clamp 2 is not restricted.

[0077] The safety clamp 2 is installed on the suspension 3, and the safety clamp 2 includes a safety clamp seat 21, a stationary wedge 22, a dynamic wedge 23 and a reset spring 51. The safety clamp seat 21 is fixedly installed on the suspension 3, and a mounting interface adapted to the suspension 3 is provided on the safety clamp seat 21. The safety clamp seat 21 is used to install the stationary wedge 22, the dynamic wedge 23 and the lifting member 5, and the safety clamp seat 21 has a U-shaped opening.

[0078] The stationary wedge 22 and the moving wedge 23 are located in the U-shaped opening of the safety clamp seat 21. The stationary wedge 22 is fixedly mounted on the safety clamp seat 21, and the moving wedge 23 is located between the stationary wedge 22 and the guide rail 4. The moving wedge 23 and the stationary wedge 22 are both wedge-shaped. Along the downward running direction of the car, the moving wedge 23 is small at the top and large at the bottom, and the stationary wedge 22 is large at the top and small at the bottom. The inclined surfaces of the moving wedge 23 and the stationary wedge 22 cooperate, and specifically, the inclined surfaces of the moving wedge 23 and the stationary wedge 22 are in contact.

[0079] The side of the stationary wedge 22 opposite to its inclined surface is a vertical surface, and the side of the moving wedge 23 opposite to its inclined surface is a vertical surface. When the car is on the vertical guide rail 4 in the hoistway, the vertical surface of the stationary wedge 22 and the vertical surface of the moving wedge 23 are parallel to the guide rail 4, and the vertical surface of the moving wedge 23 is a braking surface.

[0080] The vertical surface of the stationary wedge block 22 is fixed on the safety clamp seat 21. In order to reduce the impact during deceleration, an elastic buffer element 211 is added between the stationary wedge block 22 and the safety clamp seat 21. The elastic buffer element 211 is a buffer rubber, a buffer spring, etc.

[0081] The return spring 51 is arranged between the bottom surface of the moving wedge 23 and the safety clamp seat 21. One end of the lifting member 5 is connected to the top of the moving wedge 23, and the other end is connected to the trigger ring 151. The trigger ring 151 pulls the lifting member 5, and the lifting member 5 drives the moving wedge 23 to move upward and move toward the guide rail 4. The moving wedge 23 gradually approaches and clamps the guide rail 4, so that the vertical surface of the moving wedge 23 contacts the guide rail 4 to generate friction resistance. The resistance is opposite to the gravity of the car and the downward movement direction. After the moving wedge 23 contacts the guide rail 4, the resistance increases when it continues to move upward until the car stops running, achieving the function of stopping the car, and the return spring 51 is stretched at the same time. When the lifting force of the lifting member 5 on the moving wedge 23 is cancelled, the moving wedge 23 moves downward and moves away from the guide rail 4 under the elastic force of the return spring 51, detaches from the guide rail 4, and returns to the initial state.

[0082] In order to reduce the running resistance between the stationary wedge block 22 and the moving wedge block 23, measures can be taken to reduce the friction resistance between the inclined surface of the stationary wedge block 22 and the inclined surface of the moving wedge block 23, including but not limited to: adding multiple rolling bodies between the stationary wedge block 22 and the moving wedge block 23, or coating and embedding friction-reducing materials on the contact surface. The rolling body installation adopts existing installation methods such as bearing roller cages.

[0083] In order to increase the frictional resistance between the moving wedge block 23 and the guide rail 4, measures can be taken to increase the frictional resistance between the vertical surface of the moving wedge block 23 and the guide rail 4, including but not limited to: increasing the friction treatment on the surface where the vertical surface of the moving wedge block 23 contacts the guide rail 4, such as coating and embedding friction-increasing materials or surface knurling to reduce surface roughness.

[0084] In order to make the movement direction of the lifting member 5 adapt to the movement direction of the moving wedge block 23 and reduce or eliminate the deviation of the movement direction caused by the buffer element 1-1 or installation error, a slide groove 231 is provided on the moving wedge block 23. The length direction of the slide groove 231 is parallel to the running direction of the moving wedge block 23 toward or away from the guide rail 4. One end of the lifting member 5 is slid in the slide groove 231: the moving wedge block 23 moves upward and toward the guide rail 4, or moves downward and away from the guide rail 4. The end of the lifting member 5 connected to the moving wedge block 23 moves along the slide groove 231.

[0085] The safety clamp is equivalent to having only one brake block, and is a single-braking-surface safety clamp, which can achieve braking by clamping one side of the guide rail. The guide limit wheel set 31 drives the suspension 3 to adapt to the changing direction of the guide rail 4, and at the same time drives the safety clamp seat 21 to adapt to the changing direction of the guide rail 4, so that the vertical surface of the moving wedge block 23 remains parallel to the guide rail 4. When braking, the vertical surface of the moving wedge block 23 can completely contact the guide rail 4, achieving effective braking, and overcoming the defects of traditional clamping braking.

[0086] The motion detection unit is electrically connected to the monitoring and control system of the elevator. The motion detection unit is a normally closed safety switch, which is installed on the safety clamp 2. When the moving wedge 23 moves the clamping guide rail 4, it triggers its action, making the normally closed contact of the normally closed safety switch become normally open contact, disconnecting the electrical circuit, and the elevator system will not be able to start the elevator again until the switch state of the motion detection unit is restored.

[0087] When the mechanical action unit is actuated, that is, the moving wedge 23 moves, the normally closed safety switch serving as the action detection unit is triggered to be disconnected. In other words, at this time, the normally closed safety switch is disconnected, the circuit is disconnected, and the elevator monitoring and control system determines that the safety protection device has started to act and realizes the protection function. The elevator will not be able to start the car operation again until the switch state of the action detection unit is restored.

[0088] It should be noted that the electrical action unit 14 and the action detection unit are both normally closed switches. The electrical action unit 14 and the action detection unit are both connected in series to the electrical safety circuit of the elevator. When disconnected, the elevator's safety circuit will be disconnected, the power supply circuit and the brake circuit of the main engine will be cut off, the elevator will stop supplying power and brake, and the car will stop running. The difference is that their monitoring objects are different. The electrical action unit 14 is located on the speed limiter 1, and is used to monitor and respond to the speed of the speed limiter wheel 121. When the car running speed exceeds a certain value (such as 115% of the normal running speed of the car), the speed of the speed limiter wheel 121 exceeds the set value, the centrifugal block 131 will produce centrifugal movement and trigger the electrical action unit 14, disconnecting the electrical circuit and cutting off the main engine operation. If the cutting effect of the electrical action unit 14 fails, or the car continues to run at an overspeed, the action of the safety clamp 2 will be triggered, and the moving wedge block 23 will clamp the guide rail 4 to stop the elevator. The action detection unit is located on the safety clamp seat 21, and is used to monitor and respond to whether the moving wedge block 23 is in motion. When the moving wedge block 23 is in motion, it touches the action detection unit to make it move, cut off the electrical circuit, and stop the operation of the elevator system.

[0089] The working process of the present invention is as follows: the suspension 3 drives the speed limiter 1 and the safety clamp 2 to run synchronously with the car, and the monitoring control system of the elevator monitors the parameters such as the running speed of the car. The speed limiter wheel 121 contacts the guide rail 4 and rolls clockwise along the guide rail 4. When the speed limiter wheel 121 rotates clockwise and the speed reaches a certain value, the centrifugal block 131 undergoes centrifugal motion, or the large end of the centrifugal block 131 moves away from the rotation axis of the speed limiter wheel 121. As the speed of the speed limiter wheel 121 increases, the large end of the centrifugal block 131 first hits the electrical action unit 14, and the electrical action unit 14 is disconnected, that is, the normally closed safety switch of the electrical circuit is disconnected, and the elevator host stops running. If the elevator speed does not decrease and further exceeds the speed limit, the large end of the centrifugal block 131 will hit the limit rod of the trigger limit block 134 that does not contact the limit block 136, causing the trigger limit block 134 to rotate counterclockwise and disengage the pawl 137. The pawl 137 rotates counterclockwise under the elastic force of the pawl reset spring 138 and is blocked by the limit block 136. As the speed limiter wheel 121 continues to rotate clockwise, the pawl 137 will touch the teeth of the trigger ring 151, overcoming the resistance of the trigger ring damper 152 to the trigger ring 151, driving the trigger ring 151 to rotate clockwise. After the trigger ring 151 rotates, one end of the lifting member 5 rotates around the trigger ring 151 and the other end transmits the drive to the safety clamp 2, lifting the wedge block 23 to move upward and approach the guide rail 4, so that the moving wedge block 23 clamps the guide rail to stop the car. When the speed of the car slows down or stops, the speed of the speed limiter wheel 121 slows down or stops, the centrifugal motion of the centrifugal block 131 stops, and the trigger ring 151 gradually stops rotating under the action of the speed limiter wheel 121 and the ratchet 137, and keeps the lifting effect on the moving wedge 23 of the safety clamp 2 through the lifting member 5. When the car is lifted upward or the car is moved so that the weight of the car is not supported by the braking force of the moving wedge 23 of the safety clamp 2, the speed limiter 1 is reset, and the trigger ring 151 is rotated in the reverse direction to release the lifting member 5, so that it stops lifting the moving wedge 23 of the safety clamp 2. At this time, the moving wedge 23 will move downward under the action of the spring 51 and separate from the guide rail 4 to achieve reset.

[0090] Embodiment 2

[0091] Different from the first embodiment, this embodiment further includes an active action unit (not shown in the figure), the active action unit is connected to the mechanical action unit, and the active action unit is also electrically connected to the monitoring and control system of the elevator.

[0092] In this embodiment, the active action unit is a driving motor, which is installed on the suspension 3 and connected to the trigger ring 151. After the motor is started, it can drive the trigger ring 151 to rotate, and the trigger ring 151 rotates to wind up the lifting member 5.

[0093] When the car running speed monitored by the monitoring and control system exceeds the set value, and the speed taking unit of the speed limiter 1 does not trigger the mechanical action unit, that is, the moving wedge 23 does not move, and the normally closed safety switch as the action detection unit cannot be triggered to disconnect it. In other words, at this time, the normally closed safety switch is closed, the circuit is connected, and the elevator monitoring and control system starts the motor as the active action unit. The active action unit triggers the mechanical action unit, so that the mechanical action unit drives the safety clamp 2 to clamp the guide rail 4 to achieve slow speed braking.

[0094] Furthermore, a backstop is provided on the active action unit, and when the trigger ring 151 is driven to rotate by the centrifugal block 131, the trigger ring 151 cannot drive the active action unit to rotate.

[0095] The technical solution of the elevator monitoring and control system for monitoring the car running speed and controlling the motor to turn on or off can be achieved through existing technologies, such as monitoring the car running speed through position or speed sensors, etc., which will not be repeated here.

[0096] Embodiment 3

[0097] Different from the first embodiment, if it is not convenient to make the speed limiter wheel 121 and the guide rail directly contact due to the layout, a speed wheel transmission mechanism can be added, and the two sides of the speed wheel transmission mechanism are connected to the guide rail and the speed limiter wheel 121 respectively. Figure 6 As shown, the speed-taking wheel transmission mechanism includes a roller 61, a tensioning mechanism 63 and a transmission device 62. The roller 61 rolls along the guide rail 4. The two sides of the transmission device 62 are respectively connected to the speed limiter wheel 121 and the roller 61. The roller 61 drives the speed limiter wheel 121 to rotate through the transmission device 62. The transmission device 62 is a transmission belt, a transmission chain, etc. In this way, the running speed of the car can be transmitted to the speed limiter wheel 121. In order to ensure reliable speed taking, a tensioning mechanism 63 can be added to make the contact between the speed-taking wheel and the guide rail more reliable. The tensioning mechanism 63 is a transition wheel that tensions the transmission device 62.

[0098] Embodiment 4

[0099] Unlike the first or third embodiment, the safety protection device of this embodiment also includes a suspended protection device. The multi-car parallel elevator is provided with at least two hoistways and at least two cars, each hoistway is provided with a car guide rail 4, and the elevator also includes a driving mechanism, a switching mechanism and a braking mechanism. When the car encounters an obstacle during the upward or downward movement, it is switched to a different hoistway for operation through the switching mechanism. The switching mechanism of the elevator system is provided with a switching track, and the detailed structure is disclosed in the patents of the applicant's application numbers 2018115767300 and 2018115767391, and no repeated description is made here. The driving mechanism drives the car to go up or down along the guide rail 4, and the structure of the driving mechanism is similar to the applicant's patents 2019101726579 and PCT / CN2020 / 078116, and no repeated description is made here. The braking device has a detailed structure disclosed in the applicant's application numbers 2019101726579 and 2019110232629, and no repeated description is made here.

[0100] like Figures 7-10 As shown, the guide rail 4 of the elevator includes a car track and a transition track, the car track includes a movable active track 751 and a fixed upper car track 752 and a fixed lower car track 753 located on the same straight line and fixedly arranged at intervals, and the transition track includes a fixed transition track 77 and a movable active transition track 771. The switching mechanism drives the active track 751 to move between the fixed upper car track 752 and the fixed lower car track 753 so that the three are connected to form a continuous track, or drives the active track 751 to move out from between the fixed upper car track 752 and the fixed lower car track 753. The switching mechanism also drives the active transition track 771 to move between the fixed transition track 77 and the fixed lower car track 753 so that the three are connected to form a continuous track, or drives the active transition track 771 to move out from between the fixed transition track 77 and the fixed lower car track 753.

[0101] The fixed upper car rail 752 and the fixed lower car rail 753 are fixedly installed on the base at intervals in a colinear manner.

[0102] The fixed transition track 77 is located on one side of the fixed upper car track 752. When the movable track 751 is moved out from between the fixed upper car track 752 and the fixed lower car track 753, the movable transition track 771 can be moved between the fixed transition track 77 and the fixed lower car track 753, so that the fixed transition track 77, the movable transition track 771 and the fixed lower car track 753 are connected in sequence.

[0103] The suspension protection device includes a mounting component 71, a driving component 73, a safety component 72, a buffer component 74 and a plurality of limit locking components.

[0104] The safety component 72 is fixedly arranged on the mounting component 71, and one end of the driving component 73 is fixed on the base, and the other end drives the mounting component 71 to move, thereby driving the safety component 72 on the mounting component 71 to move synchronously. Preferably, the driving component 73 drives the mounting component 71 to move horizontally. The safety component 72 moves to be connected to the lower end of the fixed upper car track 752 or moves away from the fixed upper car track 752. The safety component 72 may contact or not contact the lower end of the fixed upper car track 752.

[0105] The safety component 72 is a frame structure, including a top, and the buffer component is installed on the safety component 72, preferably, installed on the top of the safety component 72. The buffer component 74 includes a buffer plate 743, a plurality of springs 741 and a plurality of movable pins 742. The movable pins 742 include a large head end and a small head end. The outer diameter of the large head end is larger than the outer diameter of the small head end. The top is provided with a plurality of holes with a diameter not smaller than that of the small head end and smaller than that of the large head end. The small heads of the plurality of movable pins 742 pass through the plurality of holes from bottom to top respectively and are fixedly connected to the buffer plate 743. A spring 741 is provided on the outside of each small head end. One end of the spring 741 is fixedly connected to the buffer plate 743 and the other end is connected to the top of the safety component 72.

[0106] Based on the above arrangement, when the safety component 72 and the buffer component 74 are not subjected to external forces other than gravity, the buffer plate 743 is lifted up by the elastic force of the plurality of springs 741 to separate the buffer plate 743 from the top of the safety component 72 .

[0107] The limit locking component includes a limit slider 761, a positioning pin 762 and a pusher 763. The limit sliders 761 of the limit locking components are evenly fixedly mounted on the mounting component 71, preferably, mounted on the end of the mounting component 71 away from the driving component 73. A positioning hole is provided on the limit slider 761, and the pusher 763 is mounted on the base. The driving end of the pusher 763 is connected to and drives one end of the positioning pin 762, and the outer diameter of the other end of the positioning pin 762 is not greater than the aperture of the positioning hole. The pusher 763 can drive the positioning pin 762 to move to the positioning hole inserted into the limit slider 761, or to be pulled out from the positioning hole of the limit slider 761. The limit locking component limits and locks the mounting component 71 in the working position.

[0108] The positions of the movable rail 751, the movable transition rail 771 and the safety component 72 on the installation component 71 and the distance relationship between each other, as well as the position relationship with the limit locking component are defined as follows: when the fixed upper car rail 752, the movable rail 751 and the fixed lower car rail 753 are connected in sequence, the movable transition rail 771 is not connected to the fixed transition rail 77 and the fixed lower car rail 753; when the safety component 72 is connected to the lower end of the fixed upper car rail 752, the movable rail 751 moves out from between the fixed upper car rail 752 and the fixed lower car rail 753, the fixed transition rail 77, the movable transition rail 771 and the fixed lower car rail 753 are connected in sequence, and the positioning pin shaft 762 is aligned with and can be inserted into the positioning hole on the installation component 71, which plays a limit locking role on the installation component 71 and the safety component 72 located thereon.

[0109] In summary, when the movable rail 751 moves out from between the fixed upper car rail 752 and the fixed lower car rail 753, the lower end of the fixed upper car rail 752 is suspended in the air, and the safety component 72 is located at the lower end of the fixed upper car rail 752 for suspension protection.

[0110] The above-mentioned base is a fixed body such as an elevator shaft where the elevator is installed.

[0111] The working process of the suspension protection device is as follows: the first state of the elevator is: the fixed upper car track 752, the movable track 751 and the fixed lower car track 753 are connected in sequence to form a continuous track, and the movable transition track 771 is not connected to the transition track 7 and the fixed lower car track 753.

[0112] When the running car needs to switch tracks, specifically, needs to switch from other tracks to the fixed lower car track 753 through the fixed transition track 77, the switching mechanism drives the movable track 751 and the movable transition track 771 to move, so that the movable track 751 moves out from between the fixed upper car track 752 and the fixed lower car track 753, and the movable transition track 771 moves between the fixed transition track 77 and the fixed lower car track 753, so that the fixed transition track 77, the movable transition track 771 and the fixed lower car track 753 are connected in sequence to form a continuous track.

[0113] When the movable rail 751 moves out from between the fixed upper car rail 752 and the fixed lower car rail 753, the driving component 73 drives the installation component 71 to translate, so that the safety component 72 moves to the lower end connected to the fixed upper car rail 752. At this time, the pusher 763 drives the positioning pin shaft 762 to move and just insert it into the positioning hole of the limiting slider 761, thereby realizing the positioning of the installation component 71.

[0114] When the elevator track is to be restored to the first state, the pusher 763 drives the positioning pin shaft 762 to move, so that the positioning pin shaft 762 is pulled out from the positioning hole of the limit slider 761, and then the driving component 73 drives the installation component 71 to translate, so that the safety component 72 is moved away from the lower end of the fixed upper car track 752, and the switching mechanism drives the movable transition track 771 to move out from between the fixed transition track 77 and the fixed lower car track 753, and the movable track 751 moves to between the fixed upper car track 752 and the fixed lower car track 753 to form a continuous track.

[0115] Based on the above structure, assuming that after the movable track 751 is moved out, the car on the fixed upper car track 752 falls accidentally, first the contact on the car contacts the buffer component 74, and further contacts the buffer plate 743 of the buffer component 74, and the force is transmitted to the safety component 72 and the mounting component 71 through the spring 741 and the movable pin shaft 742, and finally transmitted to the fixed base through the limit sliders 761 evenly arranged on the mounting component 71, thereby protecting the car.

[0116] Embodiment 5

[0117] The difference between the fifth embodiment and the fourth embodiment lies in the safety component 72. In this embodiment, Fig.11 As shown, the safety component 72 includes a plurality of pins, which are arranged in parallel and spaced apart, one end of which is fixedly mounted on the mounting component 71 and the other end is cantilevered. The lower end of the fixed upper car rail 752 is provided with pin holes that match the plurality of pins, and the driving component 73 drives the plurality of pins of the safety component 72 to be inserted into or pulled out of the plurality of pin holes respectively.

[0118] The working process of the present invention is different from that of Example 2 in that when the running car needs to switch from other tracks to the fixed lower car track 753 through the fixed transition track 77, the safety component 72 moves to the multiple pin holes inserted into the lower end of the fixed upper car track 752. When the track of the elevator is to be restored to the first state, the safety component 72 is pulled out from the multiple pin holes.

[0119] Embodiment 6

[0120] The difference between the sixth embodiment and the fourth embodiment lies in the buffer component 74. In this embodiment, the buffer component 74 is rubber, and the rubber is connected to the top of the safety component 72. When the car falls accidentally, the contact point at the bottom of the car contacts the rubber, which plays a buffering role.

[0121] Finally, it is necessary to explain here that the above embodiments are only used to further illustrate the technical solution of the present invention in detail and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above content of the present invention all fall within the scope of protection of the present invention.

Claims

1. A safety protection device for a multi-car parallel elevator, wherein the cars run along guide rails (4), characterized in that: The safety protection device is installed on a suspension (3), the suspension (3) is connected to the car, the safety protection device comprises a speed limiter (1) and a safety clamp (2), the speed limiter (1) and the safety clamp (2) are connected, the speed limiter (1) comprises a speed taking unit and a mechanical action unit connected to each other, and the speed taking unit rolls along a guide rail (4); The speed limiter (1) comprises a mounting body (11), a speed acquisition unit, a speed trigger unit and a mechanical action unit; The mechanical action unit comprises a trigger ring (151) and at least one trigger ring damper (152); The safety protection device also includes an active action unit, which is connected to the mechanical action unit and is also electrically connected to the monitoring and control system of the elevator; the active action unit is installed on the suspension (3), and is connected to the trigger ring (151) to drive the trigger ring (151) to rotate; When the speed of the speed taking unit exceeds the set value, the speed trigger unit of the speed limiter (1) triggers the trigger ring (151) of the mechanical action unit; if the speed trigger unit of the speed limiter (1) does not trigger the mechanical action unit, and the car running speed detected by the monitoring control system exceeds the set value, the active action unit triggers the trigger ring (151) of the mechanical action unit; The trigger ring (151) of the mechanical action unit drives the safety clamp (2) to press the guide rail (4).

2. The safety protection device according to claim 1, characterized in that: The safety protection device also includes an action detection unit, which is electrically connected to the elevator monitoring control system. The action detection unit is a normally closed safety switch, which is mounted on the safety clamp (2). When the safety clamp (2) moves the clamping guide rail (4), its action is triggered, so that the normally closed contact of the normally closed safety switch becomes a normally open contact, thereby disconnecting the electrical circuit.

3. The safety protection device according to claim 1, characterized in that: The safety protection device also includes a lifting member (5), which is a flexible rope. The two ends of the lifting member (5) are respectively connected to the speed limiter (1) and the safety clamp (2). The speed limiter (1) is wound around the lifting member (5) to trigger the safety clamp (2) to operate.

4. The safety protection device according to claim 3, characterized in that: The speed taking unit comprises a speed limiter wheel (121) which rolls along a guide rail. The speed triggering unit comprises a centrifugal block (131) which is located on an end surface of the speed limiter wheel (121). When the running speed of the elevator car exceeds a set value, the centrifugal block (131) undergoes centrifugal motion and triggers the mechanical action unit.

5. The safety protection device according to claim 4, characterized in that: The speed limiter (1) further comprises a mounting body (11), the mounting body (11) being the base of the speed limiter, and the speed taking unit being rotatably mounted on the mounting body (11).

6. The safety protection device according to claim 5, characterized in that: The mechanical action unit comprises a trigger ring (151) and at least one trigger ring damper (152); the trigger ring (151) is rotatably mounted on a mounting body (11); the trigger ring damper (152) for stabilizing the trigger ring (151) is mounted on the mounting body (11); one end of a lifting member (5) is fixed on the trigger ring (151) and the other end is connected to a safety clamp (2); when the centrifugal block (131) undergoes centrifugal motion, it drives the trigger ring (151) to rotate and winds up the lifting member (5).

7. The safety protection device according to any one of claims 1 to 6, characterized in that: The elevator comprises a switching mechanism, wherein the guide rail (4) comprises a movable active rail (751) and a fixed upper car rail (752) and a fixed lower car rail (753) which are fixedly arranged at intervals on the same straight line, and the switching mechanism drives the movable rail (751) to move in or out between the fixed upper car rail (752) and the fixed lower car rail (753).

8. The safety protection device according to claim 7, characterized in that: The safety protection device also includes a suspended protection device, which includes a mounting component (71), a driving component (73) and a safety component (72), wherein the safety component (72) is fixedly arranged on the mounting component (71), and one end of the driving component (73) is fixed on a base body, and the other end drives the mounting component (71) to move until the safety component (72) is connected to the lower end of the fixed upper car track (752) or moves away from the fixed upper car track (752).

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