Elevator toe guards for shallow pits

Abstract

The present application discloses an elevator toeboard suitable for shallow pits, comprising: a first toeboard mounted on the sill, and a second toeboard that can be slidably folded relative to the first toeboard, and also comprising: a bracket fixed on the car bottom platform; a turntable rotatably mounted on the bracket, the turntable being provided with a track extending along an arc, the track being arranged around the axis of the turntable, and at least in one rotation direction, the distances of each point on at least a part of the track relative to the axis of the turntable increase successively; a transmission member mounted on the second toeboard and matched with the track, the transmission member being driven by the track to drive the second toeboard to fold or unfold relative to the first toeboard when the turntable rotates; a driving member fixed relative to the hoistway for driving the turntable to rotate. The elevator toeboard suitable for shallow pits provided by the present application can automatically fold and unfold the toeboard through a mechanical structure, has low production cost, good working stability, and is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The present application relates to the technical field of elevators, and in particular to an elevator toe plate suitable for shallow pits. Background Art

[0002] The elevator door toe guard is installed below the door sill to prevent people from being cut and injured by the descending car after entering the shaft by mistake. The vertical height of the toe guard is an important factor in ensuring passenger safety. The national standard GB7588-2003 requires that the vertical height of the car toe guard should not be less than 750mm. In actual use, many elevators are affected by the installation environment. Especially when installing elevators in old buildings, the depth of the elevator pit is limited by underground pipes and other facilities, resulting in interference between the toe guard and the pit after the car is completely lowered. Summary of the invention

[0003] Based on this, the present application provides a toe guard that can meet both national standard requirements and the needs of shallow pits.

[0004] An elevator toeboard suitable for a shallow pit, comprising: a first toeboard installed on a sill, and a second toeboard slidably foldable relative to the first toeboard, and further comprising:

[0005] A bracket fixed on the car bottom platform;

[0006] Rotating a turntable mounted on the bracket, the turntable is provided with a track extending in a curve, the track is arranged around the axis of the turntable, and at least in one rotation direction, the distances of various points on at least a part of the track relative to the axis of the turntable increase sequentially;

[0007] A transmission member installed on the second foot guard and matched with the track, when the turntable rotates, the transmission member is driven by the track to drive the second foot guard to fold or unfold relative to the first foot guard;

[0008] A driving member for driving the turntable to rotate is fixed relative to the well.

[0009] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0010] Optionally, a safety switch is provided on the first toe guard plate, and a trigger member cooperating with the safety switch to confirm the deployed state is provided on the second toe guard plate.

[0011] Optionally, the track extends along an arc and the arc is an axially symmetrical figure, and the points where the track intersects the axis of symmetry are respectively a proximal point close to the axis of the turntable and a distal point far from the axis of the turntable, and the transmission member cooperates with the track of the proximal point when the second toe guard is in the extended state, and cooperates with the track of the distal point when the second toe guard is in the folded state.

[0012] Optionally, the track is continuously arranged around the axis of the turntable, and in a certain rotation direction, the distances between each point on the track located on one side of the symmetry axis and the axis of the turntable increase successively.

[0013] Optionally, the transmission member is two rotating shafts arranged in sequence along the vertical direction, and the two rotating shafts are respectively located on opposite sides of the track.

[0014] Optionally, the track extends along an arc and the arc is an axially symmetrical figure. The track is arranged at intervals around the axis of the turntable. The track located on one side of the symmetry axis includes at least two sections. In a certain rotation direction, the distances of each point on each section of the track relative to the axis of the turntable increase successively, and there is a radial spacing between two adjacent sections of the track as a guide channel.

[0015] Optionally, the transmission member is at least two rotating shafts arranged in sequence along the vertical direction, and two adjacent rotating shafts are respectively located on opposite sides of a corresponding section of the track. When the turntable rotates, each section of the track cooperates with the corresponding two rotating shafts in sequence.

[0016] Optionally, the second foot guard plate is provided with a plurality of strip holes extending in the horizontal direction, and each rotating shaft is slidably installed in the corresponding strip hole.

[0017] Optionally, a rotating shaft is rotatably mounted on the bracket, one end of the rotating shaft is fixedly connected to the turntable, and a force-applying wheel is fixedly mounted on the other end of the rotating shaft.

[0018] Optionally, the driving member is a driving plate installed on the inner wall of the well, and the driving plate is frictionally matched with the outer periphery of the force-applying wheel.

[0019] The elevator toe guard suitable for shallow pits provided in the present application can automatically fold and unfold the toe guard through a mechanical structure, has low production cost, good working stability, and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of Embodiment 1 of an elevator toeboard applicable to a shallow pit of the present application;

[0021] Figure 2 A side view of Embodiment 1 of an elevator toeboard applicable to a shallow pit of the present application;

[0022] Figure 3aThis is a schematic diagram of an elevator toeboard embodiment 1 of the present application applicable to a shallow pit in an unfolded state;

[0023] Figure 3b This is a schematic diagram of Embodiment 1 of an elevator toeboard suitable for a shallow pit of the present application in a half-folded state;

[0024] Figure 3c This is a perspective view of Embodiment 1 of the elevator toeboard applicable to a shallow pit of the present application in a half-folded state;

[0025] Figure 3d This is a schematic diagram of Embodiment 1 of the elevator toeboard applicable to a shallow pit in the present application in a folded state;

[0026] Figure 3e This is a perspective view of Embodiment 1 of the elevator toeboard applicable to a shallow pit in the present application in a folded state;

[0027] Figure 4a This is a schematic diagram of the turntable and track in Example 1 of the elevator toeboard applicable to a shallow pit of the present application;

[0028] Figure 4b This is a side view of the turntable and track in Example 1 of the elevator toeboard for a shallow pit of the present application;

[0029] Figure 4c This is a front view of the turntable and track in Example 1 of the elevator toeboard for a shallow pit of the present application;

[0030] Figure 5a A side view of the guide rail in Embodiment 1 of the elevator toeboard for a shallow pit of the present application;

[0031] Figure 5b for Figure 5a A-direction view in the figure;

[0032] Figure 5c This is a schematic diagram of the guide rail in Example 1 of the elevator toeboard applicable to a shallow pit of the present application;

[0033] Figure 6a This is a perspective view of Embodiment 2 of an elevator toeboard suitable for a shallow pit in the present application in an unfolded state;

[0034] Figure 6b A perspective view of Embodiment 2 of an elevator toeboard suitable for a shallow pit of the present application during the folding process;

[0035] Figure 6c A perspective view of Embodiment 2 of an elevator toeboard suitable for a shallow pit of the present application during the folding process;

[0036] Figure 6d This is a perspective view of Embodiment 2 of the elevator toeboard applicable to a shallow pit in the present application in a folded state;

[0037] Figure 7a This is a schematic diagram of a turntable and a track in Example 2 of an elevator toeboard suitable for a shallow pit of the present application;

[0038] Figure 7b This is a side view of the turntable and track in Example 2 of the elevator toeboard for a shallow pit of the present application;

[0039] Figure 7c This is a front view of the turntable and track in Example 2 of the elevator toe guard applicable to a shallow pit of the present application.

[0040] In the figure: 1. car bottom platform; 2. bracket; 3. sill; 4. force wheel; 5. driving member; 6. turntable; 7. reinforcement plate; 8. first footboard; 9. second footboard; 10. second guide member; 11. first guide member; 111. guide groove; 112. slide groove; 113. mounting hole; 114. side screw hole; 115. bottom screw hole; 12. folding edge; 13. rotating shaft; 14. rotating shaft; 141. first rotating shaft; 142. second rotating shaft; 143. third rotating shaft; 144. fourth rotating shaft; 15. track; 151. first section of track; 152. second section of track; 153. third section of track; 16. safety switch. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the invention of the present application, any of the currently described embodiments or preferred methods.

[0043] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] The horizontal direction, vertical direction, up, down, left, right and other directions described in the text refer to the state of use, and clockwise, counterclockwise, etc. refer to the state shown in the figure.

[0046] Example 1

[0047] See also Figure 1 As shown, an elevator toeboard suitable for a shallow pit comprises: a first toeboard 8 mounted on a sill 3, and a second toeboard 9 slidably foldable relative to the first toeboard 8, and further comprises:

[0048] A bracket 2 fixed on the car bottom platform 1;

[0049] A turntable 6 mounted on the bracket 2 is rotated, and a track 15 extending along a curve is provided on the turntable 6. The track 15 is arranged around the axis of the turntable 6, and at least in one rotation direction, the distances of various points on at least a part of the track 15 relative to the axis of the turntable 6 increase sequentially;

[0050] A transmission member installed on the second footboard 9 and matched with the track 15, when the turntable 6 rotates, the transmission member is driven by the track 15 to drive the second footboard 9 to be folded or unfolded relative to the first footboard 8;

[0051] A driving member 5 for driving a rotating disk 6 to rotate is fixed relative to the hoistway.

[0052] When the elevator car descends to the pit, the turntable 6 is driven to rotate by the driving member 5, and the track 15 on the turntable 6 rotates synchronously. The track 15 drives the transmission member to drive the second footboard 9 to be folded relative to the first footboard 8. When the elevator car rises from the pit, the turntable 6 is driven to rotate in the opposite direction by the driving member 5, and the track 15 on the turntable 6 rotates synchronously. The track 15 drives the transmission member to drive the second footboard 9 to be unfolded relative to the first footboard 8. At the same time, the gravity of the second footboard 9 will also assist the second footboard 9 to be unfolded relative to the first footboard 8.

[0053] The curve is a curve in a two-dimensional plane. The shape of the curve is varied and any shape can be adopted as long as it can meet the function to be achieved by the track.

[0054] The present application automatically drives the second footboard 9 to fold and unfold relative to the first footboard 8 through the driving member 5, without the assistance of any electronic equipment, and has low cost. When the elevator car runs close to the pit, the second footboard 9 switches to a folded state relative to the first footboard 8, reducing the height space occupied by the footboard, so that the footboard can be stably accommodated in the shallow pit. When the car leaves the pit, the second footboard 9 switches to an unfolded state relative to the first footboard 8 to meet the national standard requirement that the height of the footboard is not less than 750mm when the elevator is working, which effectively blocks and protects passengers, and has good safety and working stability.

[0055] See also Figure 1 As shown, the bottom of the second toe guard 9 is provided with a folded edge 12 which is arranged obliquely relative to the vertical plane. When the second toe guard 9 descends and touches a foreign object, the guiding effect of the folded edge 12 can effectively reduce the damage.

[0056] The first foot guard 8 and the second foot guard 9 are provided with mutually cooperating guide mechanisms, which can take various forms, see Figure 5a As shown, two opposite sides of the first foot guard 8 in the horizontal direction are provided with guide grooves 111 , and two opposite sides of the second foot guard 9 in the horizontal direction are provided with guide strips matching with the corresponding guide grooves 111 .

[0057] The guide mechanisms on both sides in the horizontal direction can improve the stability of the movement of the second foot guard 9 and avoid the second foot guard 9 from getting stuck.

[0058] See also Figure 5a , Figure 5b , Figure 5c As shown, the guide groove 111 is a dovetail groove, and the guide strip has a cross-sectional shape corresponding to the dovetail groove. During the mutual folding and unfolding of the first toe guard 8 and the second toe guard 9, the guide strip only performs linear reciprocating motion in the guide groove 111.

[0059] The first foot guard 8 is a plate member, and first folding edges are respectively provided on both sides of the first foot guard 8 in the horizontal direction. The guide groove 111 is provided on the first guide member 11, see Figure 5a , Figure 5b , Figure 5c The first guide component 11 is provided with a bottom edge abutting against the first folded edge, and a side edge abutting against the first foot guard plate 8, and screw holes are respectively provided on the bottom edge and the side edge. The first guide component 11 is fixedly installed on the first foot guard plate 8 by bolts passing through the bottom edge screw holes 115 and the first folded edge, and bolts passing through the side edge screw holes 114 and the first foot guard plate 8.

[0060] The second foot guard 9 is a plate member, and second folded edges are respectively provided on both sides of the second foot guard 9 in the horizontal direction. The guide strip is arranged on the second guide component 10, and the second guide component 10 is in contact with the second folded edge and fixed by bolts.

[0061] The second guide member 10 is used not only to support the guide bar, but also to play a certain balancing role together with the guide bar, so that the second foot guard 9 can maintain the consistency of displacement on both sides in the horizontal direction during the movement.

[0062] When the second foot guard 9 is in the expanded state, the second guide component 10, the guide bar and the gravity of the second foot guard 9 can keep the second foot guard 9 in the expanded state, that is, within a certain upward thrust range, the second foot guard 9 can maintain the expanded state, further ensuring safety and working stability.

[0063] In a top view in the use state, the first guide member 11 and the second guide member 10 are located between the first folded edge and the second folded edge, and the guide strip and the guide groove 111 are slidably matched with each other.

[0064] The first guide component 11 and the second guide component 10 can correspondingly increase the force strength of the first foot guard 8 and the second foot guard 9, prevent the board surface of the first foot guard 8 and the second foot guard 9 from being deformed, and improve safety and reliability.

[0065] The track 15 is arranged on the turntable 6, and the turntable 6 plays the role of supporting the track 15. When the turntable 6 rotates, the track 15 moves with the turntable 6. Figure 4a , Figure 7a As shown, the rail 15 can be arranged beyond the edge of the turntable 6 .

[0066] For increased security, see Figure 3c As shown, the first foot guard plate 8 is provided with a safety switch 16, and the second foot guard plate 9 is provided with a trigger member that cooperates with the safety switch 16 to confirm the unfolded state.

[0067] See also Figure 5a As shown, a slide groove 112 is provided on the side of the first guide member 11, and the length of the slide groove 112 defines the travel of the trigger member. The trigger member is a trigger rod, which is fixed to the top of the second foot guard 9, passes through the slide groove 112 and extends to the inside of the guide groove 111 to cooperate with the safety switch 16. The cooperation between the trigger rod and the slide groove 112 also guides the movement of the second foot guard 9 to a certain extent, making the second foot guard 9 run more smoothly.

[0068] See also Figure 5cAs shown, a mounting hole 113 is provided on the bottom edge of the first guide member 11, and the safety switch 16 is fixed on the first guide member 11. The contact arm of the safety switch 16 passes through the mounting hole 113 and extends into the guide slot 111 to cooperate with the trigger rod. The safety switch 16 is an electrical switch.

[0069] The safety switch 16 is fixed to the bottom end of the first foot guard 8. When the first foot guard 8 and the second foot guard 9 are in the unfolded state, the trigger triggers the safety switch 16. When the second foot guard 9 is folded relative to the first foot guard 8, the trigger is disengaged from the safety switch 16. Through the cooperation of the trigger and the safety switch 16, the abnormality of the unfolded state of the second foot guard 9 is discovered in time to ensure safety.

[0070] Safety switches 16 are provided on both sides of the first toe guard 8 in the horizontal direction, and corresponding triggering members are provided on both sides of the second toe guard 9 in the horizontal direction. The accuracy of the detection of the unfolded state of the second toe guard 9 is ensured by the redundant settings on both sides.

[0071] When there is a foreign object (person or object) under the toe guard in the shaft, the elevator car descends and the second toe guard 9 touches the foreign object first. When the force exerted by the foreign object on the second toe guard 9 is greater than the gravity of the second guide member 10, the guide bar and the second toe guard 9, the transmission member on the second toe guard 9 drives the second toe guard 9 to rise by acting on the track 15, the trigger member disengages from the safety switch 16, and the elevator stops running to prevent the car from continuing to descend and causing damage to the foreign object. Compared with the second toe guard 9 being set to a bent shape or an overall rigid structure, it is safer.

[0072] There are many ways to set up the track and transmission parts, see Figure 4a , Figure 4b , Figure 4c As shown, the track 15 extends along an arc, and the track 15 is an axisymmetric figure. The points where the track 15 intersects with the symmetry axis OO' are respectively the proximal point C close to the axis of the turntable 6 and the distal point B far away from the axis of the turntable 6. The transmission member cooperates with the track 15 at the proximal point C when the second foot guard 9 is in the unfolded state, and cooperates with the track 15 at the distal point B when the second foot guard 9 is in the folded state.

[0073] The track 15 is continuously arranged around the axis of the turntable 6, see Figure 4a As shown, in the counterclockwise direction in Figure 4, the distances of the points on the track 15 located on the right side of the symmetry axis OO' relative to the axis of the turntable 6 increase successively, i.e., L3>L2>L1. The track 15 on both sides of the symmetry axis OO' is smoothly connected, and the connection between the two proximal axis points C forms a concave part.

[0074] See also Figure 3a , Figure 3cAs shown, the transmission member is two rotating shafts 14 arranged in sequence along the vertical direction, and the two rotating shafts 14 are respectively located on opposite sides of the track 15.

[0075] See also Figure 3a As shown, when the second foot guard 9 is in the unfolded state, one of the rotation axes 14 is located in the recess formed by two proximal axis points, and the recess has a certain limiting effect on the rotation axis 14, thereby maintaining the unfolded state of the second foot guard 9.

[0076] See also Figure 3a to Figure 3e As shown, the working process of this embodiment is as follows:

[0077] See also Figure 3a As shown, when the second foot guard plate 9 is unfolded to the full extent, the rotation axis 14 cooperates with the track 15 at the proximal axis point C.

[0078] See also Figure 3b , Figure 3c As shown, when the car runs to the bottom pit, the driving member 5 drives the turntable 6 to rotate, and the turntable 6 moves along Figure 3a Turn counterclockwise to Figure 3c In the position shown, the rotating shaft 14 separates from the proximal axis point C and gradually moves toward the distal axis point B. Since the proximal axis point C is closer to the axis of the turntable 6 and the distal axis point B is farther from the axis of the turntable 6, when the track 15 rotates with the turntable 6, the axis of the turntable 6 remains stationary, and a force is applied to the rotating shaft 14 through different parts of the track 15, pushing the second foot guard 9 to fold upward.

[0079] See also Figure 3d , Figure 3e As shown, when the second foot guard plate 9 is folded into place, the rotating shaft 14 cooperates with the track 15 at the far axis point B.

[0080] The tracks in this application are all designed with an axisymmetric design. In actual use, usually only one side is used. When the elevator car is used for a long time and the track and turntable 6 used for a long time cannot meet the needs, the service life can be doubled by changing the installation position of the drive member 5 and using the track and turntable 6 on the other side.

[0081] See also Figure 3a As shown, a reinforcing plate 7 is provided at the middle position of the second foot guard plate 9 in the horizontal direction, and each rotating shaft 14 is rotatably mounted on the reinforcing plate 7. When the rotating shaft 14 acts on the track, the rotating shaft 14 can rotate freely to reduce the friction between the track.

[0082] The second foot guard plate 9 is provided with a plurality of strip-shaped holes extending in the horizontal direction, and each rotating shaft 14 is slidably installed in the corresponding strip-shaped hole.

[0083] The number of the strip holes is the same as the number of the rotating shafts 14. Each rotating shaft 14 has a certain movable space in the horizontal direction, so that the rotating shaft 14 has the ability to automatically adapt to the track during track movement, reducing the wear and deformation of the rotating shaft 14, increasing reliability, and extending service life.

[0084] See also Figure 2 As shown, the turntable 6 is arranged in a vertical plane, and the track on the turntable 6 faces the second foot guard 9 .

[0085] The bracket 2 is fixedly mounted on the bottom of the car bottom platform 1 , and a rotating shaft 13 is rotatably mounted on the bracket 2 . One end of the rotating shaft 13 is fixedly connected to the turntable 6 , and the other end of the rotating shaft 13 is fixedly mounted with a force applying wheel 4 .

[0086] The bracket 2 adopts a double support form for the rotating shaft 13, see Figure 1 As shown, the bracket 2 is made of channel steel, and the opposite side walls of the channel steel both support the rotating shaft 13 to prevent the axis of the rotating shaft 13 from being deflected, resulting in unsmooth rotation of the turntable 6.

[0087] The driving member 5 is used to drive the turntable 6 to rotate. The driving method can be in various forms. For example, the driving member 5 is a rack, and the turntable 6 is provided with a gear meshing with the rack. Figure 1 As shown, the driving member 5 is a driving plate installed on the inner wall of the well, and the driving plate is frictionally matched with the outer periphery of the force-applying wheel 4.

[0088] The driving plate is installed on the inner wall of the shaft through a support, and the driving plate and the force wheel 4 are transmitted through friction. During the ascent and descent of the car, the force wheel 4 is driven to rotate by the driving plate. In order to ensure that there is sufficient friction between the driving plate and the force wheel 4, friction-increasing patterns are provided on at least one of the driving plate or the force wheel 4. The friction can also be increased by changing the material. For example, a rubber layer is provided on the driving plate to interact with the force wheel 4, and a polyurethane sleeve is provided on the outer peripheral sleeve of the force wheel 4 (in order to reduce the relative rotation between the force wheel 4 and the polyurethane sleeve, knurling is provided on the surface of the force wheel 4 to reduce the friction loss between the force wheel 4 and the polyurethane). The polyurethane sleeve can also increase the deformation resistance of the force wheel 4, and protect the turntable 6, track and other transmission components when the foot guard is subjected to vibration or lateral force to avoid bending or loosening, thereby ensuring safety.

[0089] Example 2

[0090] The difference between this embodiment and embodiment 1 lies in the shape of the track, the setting method of the rotating shaft, and the matching method between the track and the rotating shaft. The rest of the structure refers to embodiment 1.

[0091] See also Figure 7a , Figure 7b , Figure 7cAs shown, the tracks are arranged at intervals around the axis of the turntable 6. The track located on one side of the symmetry axis OO' includes three sections, namely the first track section 151, the second track section 152 and the third track section 153. Figure 7a In the counterclockwise direction, the distances of each point on each track relative to the axis of the turntable 6 increase successively, and there is a radial spacing between two adjacent track sections as a guide channel.

[0092] For example, for the third track 153, Figure 7a In the counterclockwise direction, the distance between each point on the third track 153 and the axis of the turntable gradually increases, that is, it gradually increases from L6 to L7 and continues to increase. From the first track 151 to the third track 153, the distance between each point on the track and the axis of the turntable 6 gradually increases as a whole, for example, L6>L5>L4, but this trend is not met at the end points of each track. The track connection on both sides of the symmetry axis OO' is smoothly transitioned, and the connection between the two near-axis points forms a concave area.

[0093] There is a radial distance D1 between the first track section 151 and the second track section 152 , and there is a radial distance D2 between the second track section 152 and the third track section 153 .

[0094] See also Figure 6a to Figure 6d As shown, the transmission parts are four rotating shafts 14 arranged in sequence along the vertical direction, which are respectively the first rotating shaft 141, the second rotating shaft 142, the third rotating shaft 143 and the fourth rotating shaft 144 from top to bottom. Two adjacent rotating shafts 14 are respectively located on the opposite sides of the corresponding section track 15. When the turntable 6 rotates, each section track 15 cooperates with the corresponding two rotating shafts 14 in sequence.

[0095] See also Figure 6a As shown, when the second foot guard 9 is in the unfolded state, the first rotation axis 141 is located in the recess formed by the two proximal axis points C. The recess has a certain limiting effect on the rotation axis 14, thereby maintaining the unfolded state of the second foot guard 9.

[0096] See also Figure 6a to Figure 6d As shown, the working process of this embodiment is as follows:

[0097] See also Figure 6a As shown, when the second foot guard plate 9 is unfolded, the first rotation axis 141 and the second rotation axis 142 match the track at the proximal axis point C, and the first rotation axis 141 is located in the recess formed by the two proximal axis points C.

[0098] See also Figure 6b As shown, when the car runs to the bottom pit, the driving member 5 drives the turntable 6 to rotate, and the turntable 6 moves along Figure 6a Turn counterclockwise to Figure 6bIn the position shown, the first rotating shaft 141 and the second rotating shaft 142 move to the end of the first section track 151 .

[0099] See also Figure 6c As shown, the turntable 6 is along Figure 6b Turn counterclockwise to Figure 6c In the position shown, the first rotating shaft 141 and the second rotating shaft 142 are separated from the first section track 151 , and the second rotating shaft 142 and the third rotating shaft 143 are located on both sides of the second section track 152 .

[0100] See also Figure 6d As shown, the turntable 6 is along Figure 6c Turn counterclockwise to Figure 6d In the position shown, the second and third rotating shafts 143 are separated from the second track 152, and the third rotating shaft 143 and the fourth rotating shaft 144 are located on both sides of the third track 153. When the second foot guard 9 is folded into place, the rotating shaft 14 cooperates with the track at the far axis point B.

[0101] By sequentially cooperating between different rotating shafts 14 and tracks of different track sections, the gravity of the second toe guard 9 is shared, the force-bearing time of each track section and each rotating shaft 14 is reduced, the wear of components is reduced, and the stability and reliability of operation are increased.

[0102] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0103] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. Elevator toeboards suitable for shallow pits, including: A first footboard installed on the sill, and a second footboard slidably foldable relative to the first footboard, characterized in that it also includes: A bracket fixed on the car bottom platform; Rotate a turntable mounted on the bracket, wherein the turntable is provided with a track extending along a curve, the track is arranged around the axis of the turntable, and at least in one rotation direction, the distances of various points on at least a portion of the track relative to the axis of the turntable increase sequentially; A transmission member installed on the second foot guard and matched with the track, when the turntable rotates, the transmission member is driven by the track to drive the second foot guard to fold or unfold relative to the first foot guard; A driving member fixed relative to the wellbore for driving the turntable to rotate; The first foot guard is provided with a safety switch, and the second foot guard is provided with a trigger member that cooperates with the safety switch to confirm the deployed state; The track extends along an arc line and the arc line is an axisymmetric figure. The points where the track intersects with the axis of symmetry are respectively a proximal point close to the axis of the turntable and a distal point far from the axis of the turntable. The transmission member cooperates with the track at the proximal point when the second foot guard is in an extended state, and cooperates with the track at the distal point when the second foot guard is in a folded state. The tracks are continuously arranged around the axis of the turntable, and in a certain rotation direction, the distances of the points on the tracks located on one side of the axis of symmetry relative to the axis of the turntable increase successively; The transmission member is two rotating shafts arranged in sequence along the vertical direction, and the two rotating shafts are respectively located on two opposite sides of the track.

2. The elevator toeboard suitable for a shallow pit according to claim 1, characterized in that: A rotating shaft is rotatably mounted on the bracket, one end of the rotating shaft is fixedly connected to the rotating disk, and a force-applying wheel is fixedly mounted on the other end of the rotating shaft.

3. The elevator toeboard suitable for a shallow pit according to claim 2, characterized in that: The driving member is a driving plate installed on the inner wall of the well, and the driving plate is frictionally matched with the outer periphery of the force-applying wheel.

4. Elevator toeboards suitable for shallow pits, including: A first footboard installed on the sill, and a second footboard slidably foldable relative to the first footboard, characterized in that it also includes: A bracket fixed on the car bottom platform; Rotate a turntable mounted on the bracket, wherein the turntable is provided with a track extending along a curve, the track is arranged around the axis of the turntable, and at least in one rotation direction, the distances of various points on at least a portion of the track relative to the axis of the turntable increase sequentially; A transmission member installed on the second foot guard and matched with the track, when the turntable rotates, the transmission member is driven by the track to drive the second foot guard to fold or unfold relative to the first foot guard; A driving member fixed relative to the wellbore for driving the turntable to rotate; The first foot guard is provided with a safety switch, and the second foot guard is provided with a trigger member that cooperates with the safety switch to confirm the deployed state; The track extends along an arc line and the arc line is an axisymmetric figure. The track is arranged at intervals around the axis of the turntable. The track located on one side of the symmetry axis includes at least two sections. In a certain rotation direction, the distances of each point on each track section relative to the axis of the turntable increase successively, and there is a radial spacing between two adjacent track sections as a guide channel; The transmission member is at least two rotating shafts arranged in sequence along the vertical direction, and two adjacent rotating shafts are respectively located on opposite sides of the corresponding track section. When the turntable rotates, each track section cooperates with the corresponding two rotating shafts in sequence.

5. The elevator toeboard suitable for a shallow pit according to claim 4, characterized in that: The second foot guard plate is provided with a plurality of strip holes extending in the horizontal direction, and each rotating shaft is slidably installed in the corresponding strip hole.

6. The elevator toeboard suitable for a shallow pit according to claim 4, characterized in that: A rotating shaft is rotatably mounted on the bracket, one end of the rotating shaft is fixedly connected to the rotating disk, and a force-applying wheel is fixedly mounted on the other end of the rotating shaft.

7. The elevator toeboard suitable for a shallow pit according to claim 6, characterized in that: The driving member is a driving plate installed on the inner wall of the well, and the driving plate is frictionally matched with the outer periphery of the force-applying wheel.

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