An anti-pinch protection mechanism for elevator doors

Abstract

This utility model discloses an anti-pinch protection mechanism for elevator doors, including a mounting base. The mounting base is a rectangular strip structure with mounting screw holes at both ends. The mounting base is fixedly connected to the intersecting side walls of the elevator door through the mounting screw holes and bolts. A switch control box is fixedly installed at the center of the mounting base. The switch control box contains a hinged linkage anti-pinch component. Symmetrical support grooves are formed on the mounting base between the mounting screw holes at both ends, and panel support pins pass through the support grooves. This anti-pinch protection mechanism for elevator doors, through the linkage design of the anti-pinch trigger panel, primary transmission linkage, secondary transmission linkage, and normally closed trigger switch, directly converts the mechanical displacement of the clamped object into a switching action. It is completely unaffected by environmental factors and can cover the entire height of the elevator door's contact surface for clamping detection, with no trigger blind spots, ensuring the accuracy and reliability of the anti-pinch trigger.

Description

Technical Field

[0001] This utility model relates to the field of special equipment, specifically an anti-pinch protection mechanism for elevator doors. Background Technology

[0002] During elevator operation, accidents involving people or objects being trapped in elevator doors occur frequently, causing personal injury to passengers and potentially damaging elevator equipment or the trapped items. To ensure elevator safety, elevator door anti-pinch protection mechanisms have been developed.

[0003] 1. Currently available traditional elevator door anti-pinch devices, such as infrared light curtain anti-pinch devices, are easily affected by environmental factors such as dust, water vapor, and strong light, resulting in untimely or false triggering of the anti-pinch action. Mechanical touch plate anti-pinch devices have trigger blind spots, and may not be able to effectively trigger the anti-pinch action for some small objects or objects stuck on the edge of the door.

[0004] 2. Currently, some traditional anti-pinch devices on the market have unreasonable transmission structure designs. During long-term use, problems such as component wear and jamming are prone to occur, leading to the failure of the anti-pinch function. At the same time, the buffer structure design of some devices is poor, and the impact force on the switch and related components is large when the anti-pinch is triggered, which shortens the service life of the device.

[0005] Therefore, an anti-pinch protection mechanism for elevator doors is proposed to solve the aforementioned problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides an anti-pinch protection mechanism for elevator doors, which has the advantages of accurate and reliable anti-pinch triggering and strong durability. It solves the problems of traditional devices currently used in the market being easily interfered with by environmental factors such as dust, water vapor, and strong light, resulting in untimely or false triggering of anti-pinch action, and mechanical contact plate type anti-pinch devices having trigger blind zones, which may not be able to effectively trigger the anti-pinch action for some small objects or objects clamped on the edge of the door.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an anti-pinch protection mechanism for elevator doors, comprising a mounting base, the mounting base being a rectangular strip structure with mounting screw holes at its left and right ends respectively, the mounting base being fixedly connected to the intersecting sidewalls of the elevator door through the mounting screw holes and bolts, a switch control box being fixedly installed at the center of the mounting base, the switch control box containing a hinged linkage anti-pinch assembly, support grooves being symmetrically formed on the mounting base between the mounting screw holes at the left and right ends, a panel support pin passing through the support groove, an anti-pinch reset spring being nested around the outer periphery of the panel support pin, a spring positioning seat abutting the bottom of the anti-pinch reset spring, the spring positioning seat being fixed to the bottom of the support groove, an anti-pinch trigger panel being welded to the top of the panel support pin, and a flexible buffer pad being pasted on the end of the anti-pinch trigger panel facing the elevator door contact surface;

[0008] The hinged linkage anti-pinch assembly includes a normally closed trigger switch, which is fixedly installed on the left side inside the switch control box. Two primary transmission linkages are symmetrically arranged on the right side of the normally closed trigger switch, distributed on both sides inside the switch control box. A linkage guide seat is fixedly installed inside the switch control box at the position corresponding to the primary transmission linkage. A guide groove is formed in the middle of the linkage guide seat, and the primary transmission linkage is slidably connected to the guide groove of the linkage guide seat. A hinge hole is formed at the end of the primary transmission linkage away from the normally closed trigger switch, and a secondary transmission linkage is hinged to this hinge hole via a pin. There are two secondary transmission linkages, each corresponding to a primary transmission linkage, symmetrically distributed on both sides inside the switch control box. A rotating hinge seat is hinged to the end of the secondary transmission linkage away from the primary transmission linkage, with a fixed hinge shaft passing through the middle. The rotating hinge seat rotates around the fixed hinge shaft, and both ends of the fixed hinge shaft are fixedly installed on the inner wall of the switch control box.

[0009] Furthermore, both ends of the primary transmission link are provided with buffer structures. One end is in contact with the contacts of the normally closed trigger switch. The buffer structure at this end is a rubber buffer sleeve fitted onto the end of the primary transmission link. The rubber buffer sleeve is made of EPDM rubber. The other end extends to the outside through the through hole opened on the right side wall of the switch control box. This end is in contact with the inner side wall of the anti-pinch trigger panel. The inner wall of the through hole on the right side wall of the switch control box is provided with a rubber sealing ring. The rubber sealing ring is in contact with the outer periphery of the primary transmission link.

[0010] Furthermore, the spring positioning seat has an annular limiting protrusion inside, which is a boss structure integrally formed on the inner wall of the spring positioning seat. The top of the anti-pinch reset spring is fitted with a circular spring seat, and an annular limiting groove is opened on the outer periphery of the spring seat. The width of the annular limiting groove is adapted to the height of the annular limiting protrusion inside the spring positioning seat.

[0011] Furthermore, the flexible buffer pad is made of silicone, and hemispherical protrusions are evenly distributed on the side of its surface facing the elevator door. The flexible buffer pad is glued and fixed to the anti-pinch trigger panel with food-grade silicone adhesive.

[0012] Furthermore, the inner wall of the guide groove of the connecting rod guide seat is covered with a polytetrafluoroethylene wear-resistant layer, and both ends of the guide groove are provided with flared guide portions.

[0013] Furthermore, a brass bushing is provided at the hinge point between the secondary transmission link and the rotary hinge seat. The inner diameter of the brass bushing is adapted to the outer diameter of the hinge pin. The length of the bushing is equal to the thickness of the rotary hinge seat, and both ends of the bushing are flush with the two side walls of the rotary hinge seat. The inner wall of the bushing is coated with lithium-based grease.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] 1. The anti-pinch protection mechanism of this elevator door, through the linkage design of the anti-pinch trigger panel, the first-stage transmission link, the second-stage transmission link and the normally closed trigger switch, directly converts the mechanical displacement of the clamped object into a switching action. It is completely unaffected by environmental factors and can cover the entire height of the elevator door's contact surface for clamping detection. There is no trigger blind spot, ensuring the accuracy and reliability of the anti-pinch trigger.

[0016] 2. The anti-pinch protection mechanism of this elevator door enhances durability through multiple wear-resistant and buffering designs: the PTFE wear-resistant layer in the guide groove of the connecting rod guide seat, the brass bushing and lithium-based grease at the hinge of the secondary transmission connecting rod and the rotating hinge seat significantly reduce wear between components; the rubber buffer sleeves at both ends of the primary transmission connecting rod and the flexible buffer pad of the anti-pinch trigger panel effectively buffer the impact force when the anti-pinch is triggered; the annular limiting structure of the spring positioning seat ensures the long-term stable operation of the anti-pinch reset spring. These designs collectively extend the service life of the device and reduce maintenance frequency and costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an anti-pinch protection mechanism for elevator doors according to the present invention.

[0018] Figure 2 This is a schematic diagram of the mounting base structure for this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the spring positioning seat in this utility model;

[0020] Figure 4 This is a schematic diagram of the anti-pinch assembly structure of the hinged connecting rod in this practical application.

[0021] In the diagram: 1. Mounting base; 2. Mounting screw hole; 3. Switch control box; 4. Hinge linkage anti-pinch assembly; 401. Normally closed trigger switch; 402. Primary transmission linkage; 403. Linkage guide seat; 404. Secondary transmission linkage; 405. Rotary hinge seat; 5. Support groove; 6. Panel support pin; 7. Anti-pinch return spring; 8. Spring positioning seat; 9. Anti-pinch trigger panel; 10. Flexible buffer pad. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 An anti-pinch protection mechanism for elevator doors in this embodiment includes a mounting base 1, which is a rectangular strip structure with mounting screw holes 2 at its left and right ends. The mounting base 1 is fixedly connected to the intersecting side wall of the elevator door through the mounting screw holes 2 and bolts. A switch control box 3 is fixedly installed at the center of the mounting base 1. A hinged linkage anti-pinch assembly 4 is installed inside the switch control box 3. A support groove 5 is symmetrically opened on the mounting base 1 between the mounting screw holes 2 at the left and right ends. A panel support pin 6 passes through the support groove 5. An anti-pinch reset spring 7 is nested on the outer periphery of the panel support pin 6. A spring positioning seat 8 is abutted at the bottom of the anti-pinch reset spring 7. The spring positioning seat 8 is fixed to the bottom of the support groove 5. An anti-pinch trigger panel 9 is welded to the top of the panel support pin 6. A flexible buffer pad 10 is pasted on the end of the anti-pinch trigger panel 9 facing the elevator door contact surface.

[0024] The articulated linkage anti-pinch assembly 4 includes a normally closed trigger switch 401, which is fixedly installed on the left side inside the switch control box 3. Two primary transmission linkages 402 are symmetrically arranged on the right side of the normally closed trigger switch 401, distributed on both sides inside the switch control box 3. A linkage guide seat 403 is fixedly installed inside the switch control box 3 corresponding to the position of the primary transmission linkage 402. A guide groove is formed in the middle of the linkage guide seat 403, and the primary transmission linkage 402 is slidably connected to the guide groove of the linkage guide seat 403. A hinge hole is provided at the end of the primary transmission link 402 away from the normally closed trigger switch 401. A secondary transmission link 404 is hinged to this hinge hole via a pin. There are two secondary transmission links 404, which correspond one-to-one with the primary transmission link 402 and are symmetrically distributed on both sides inside the switch control box 3. A rotating hinge seat 405 is hinged to the end of the secondary transmission link 404 away from the primary transmission link 402. A fixed hinge shaft passes through the middle of the rotating hinge seat 405. The rotating hinge seat 405 rotates around the fixed hinge shaft, and the two ends of the fixed hinge shaft are fixedly installed on the inner wall of the switch control box 3.

[0025] Both ends of the primary transmission link 402 are equipped with buffer structures. One end of the buffer structure is in close contact with the contacts of the normally closed trigger switch 401. Specifically, the buffer structure at this end is a rubber buffer sleeve fitted onto the end of the primary transmission link 402. The rubber buffer sleeve is made of EPDM rubber, which has excellent aging resistance and elasticity. When the primary transmission link 402 contacts the normally closed trigger switch 401, it can effectively reduce the impact force between the two, avoid long-term friction leading to wear of the switch contacts, and extend the service life of the normally closed trigger switch 401. The other end of the primary transmission link 402 extends through a pre-set through hole on the right side wall of the switch control box 3 to the outside of the box, and this end is in contact with the inner side wall of the anti-pinch trigger panel 9. A rubber sealing ring is also embedded in the inner wall of the through hole on the right side wall of the switch control box 3. The rubber sealing ring is in close contact with the outer periphery of the primary transmission link 402, which can reduce the friction between the primary transmission link 402 and the inner wall of the through hole when sliding, and also prevent external dust and moisture from entering the interior of the switch control box 3, protecting the components of the hinged link anti-pinch assembly 4 inside the box from contamination and maintaining the stable operation of the mechanism.

[0026] The spring positioning seat 8 has an annular limiting protrusion machined inside. This annular limiting protrusion is a boss structure integrally formed on the inner wall of the spring positioning seat 8, which has strong structural integrity, requires no additional assembly, and reduces the risk of component loosening. The top of the anti-pinch return spring 7 is fitted with a circular spring seat, and the outer circumference of the spring seat has an annular limiting groove. The width of the annular limiting groove is adapted to the height of the annular limiting protrusion inside the spring positioning seat 8. During assembly, the annular limiting protrusion can be engaged in the annular limiting groove. This matching method can play a precise radial limiting role for the anti-pinch return spring 7, preventing the anti-pinch return spring 7 from shifting or tilting during compression or reset, ensuring that the anti-pinch return spring 7 always exerts force along the axial direction, ensuring that the anti-pinch trigger panel 9 can be reset smoothly, and improving the operational stability of the anti-pinch mechanism.

[0027] The flexible buffer pad 10 is made of silicone, which is soft and has good elasticity and toughness. The side of the flexible buffer pad 10 facing the elevator door has hemispherical protrusions evenly distributed. The hemispherical protrusions not only increase the contact area between the flexible buffer pad 10 and the object being pinched, but also further disperse the impact force through its own deformation. When the elevator door accidentally pinches a person's limbs or objects, it can significantly reduce the risk of pinching injury and the probability of damage to the objects. The flexible buffer pad 10 is fixed to the anti-pinch trigger panel 9 by food-grade silicone adhesive. Food-grade silicone adhesive has non-toxic and environmentally friendly properties. Even if the adhesive ages slightly during long-term use of the elevator, it will not produce harmful substances. It is especially suitable for scenarios with high requirements for environmental cleanliness, such as hospitals and food workshops. At the same time, the bonding method is firm and reliable, which can prevent the flexible buffer pad 10 from falling off during long-term use.

[0028] The inner wall of the guide groove of the connecting rod guide seat 403 is coated with a polytetrafluoroethylene (PTFE) wear-resistant layer. PTFE has an extremely low coefficient of friction and is wear-resistant and corrosion-resistant, which can significantly reduce the frictional resistance when the primary transmission connecting rod 402 slides in the guide groove, making the movement of the primary transmission connecting rod 402 smoother and avoiding jamming due to excessive friction, ensuring timely response of the anti-pinch trigger action. The two ends of the guide groove are also designed with flared guide parts with a gradually changing opening structure. When the primary transmission connecting rod 402 is resetting and sliding, even if there is a slight positional deviation, it can smoothly enter the guide groove through the guidance of the guide parts, avoiding collision and jamming between the primary transmission connecting rod 402 and the end of the guide groove, and improving the fault tolerance of the mechanism operation.

[0029] A brass bushing is installed at the hinge point between the secondary transmission link 404 and the rotary hinge seat 405. The inner diameter of the brass bushing matches the outer diameter of the hinge pin, and the length of the bushing is the same as the thickness of the rotary hinge seat 405. Both ends of the bushing are flush with the side walls of the rotary hinge seat 405. This dimensional matching design ensures that the brass bushing completely fills the hinge gap, preventing wobbling between the secondary transmission link 404 and the rotary hinge seat 405. The inner wall of the brass bushing is also coated with lithium-based grease. Lithium-based grease has good lubrication performance and temperature resistance, forming a stable lubricating film at the hinge point. This reduces frictional loss between the secondary transmission link 404, the brass bushing, and the hinge pin, extending the service life of the hinged parts. Simultaneously, it ensures more flexible rotation of the secondary transmission link 404 and the rotary hinge seat 405, guaranteeing timely transmission of the anti-pinch signal.

[0030] In summary, the operating principle of this anti-pinch protection mechanism for elevator doors is clear. When an object is caught during the closing process of the elevator door, the object presses against the anti-pinch trigger panel 9, causing the panel support pin 6 to move into the support groove 5, which in turn pushes the first-stage transmission link 402 to slide in the guide groove of the link guide seat 403. When the first-stage transmission link 402 moves, it pulls the second-stage transmission link 404, causing the rotating hinge seat 405 to rotate around the fixed hinge axis. At the same time, the contacts of the first-stage transmission link 402 and the normally closed trigger switch 401 separate, and the normally closed type... Trigger switch 401 sends a signal to control the elevator door operator to reverse and open the door; after the object is removed, the anti-pinch reset spring 7 releases its elastic potential energy under the limiting action of spring positioning seat 8, pushing the panel support pin 6 and the anti-pinch trigger panel 9 to reset. The first-stage transmission link 402 and the second-stage transmission link 404 are also reset together. The first-stage transmission link 402 re-engages with the normally closed trigger switch 401 contact, and the mechanism returns to its initial state. The entire process relies on the fixed support of the mounting base 1 and the switch control box 3 to achieve a complete anti-pinch action closed loop.

[0031] Furthermore, by employing a mechanically linked hinged anti-pinch assembly 4 in conjunction with an anti-pinch trigger panel 9, it is unaffected by environmental factors such as dust and moisture, ensuring no blind spots in anti-pinch triggering and timely response, effectively improving the safety of elevator door operation. The buffer structures at both ends of the primary transmission link 402, the PTFE wear-resistant layer in the link guide seat 403, and the brass bushing at the hinge point between the secondary transmission link 404 and the rotating hinge seat 405 significantly reduce component wear and extend the service life of the mechanism. The limiting cooperation between the spring positioning seat 8 and the anti-pinch reset spring 7, and the elastic protection of the flexible buffer pad 10, ensure stable operation of the mechanism and reduce the impact force when clamping objects, balancing reliability and user experience. The overall structure is adaptable to various elevator door scenarios and is highly practical.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-pinch protection mechanism for elevator doors, comprising a mounting base (1), characterized in that: The mounting base (1) is a rectangular strip structure with mounting screw holes (2) at its left and right ends respectively. The mounting base (1) is fixedly connected to the intersecting side wall of the elevator door through the mounting screw holes (2) and bolts. A switch control box (3) is fixedly installed at the center of the mounting base (1). A hinged linkage anti-pinch assembly (4) is installed inside the switch control box (3). A support groove (5) is symmetrically opened on the mounting base (1) between the mounting screw holes (2) at the left and right ends. A panel support pin (6) is inserted inside the support groove (5). An anti-pinch reset spring (7) is nested on the outer periphery of the panel support pin (6). A spring positioning seat (8) is abutted at the bottom of the anti-pinch reset spring (7). The spring positioning seat (8) is fixed to the bottom of the support groove (5). An anti-pinch trigger panel (9) is welded to the top of the panel support pin (6). A flexible buffer pad (10) is pasted on the end of the anti-pinch trigger panel (9) facing the elevator door contact surface. The articulated link anti-pinch assembly (4) includes a normally closed trigger switch (401). The normally closed trigger switch (401) is fixedly installed on the left side inside the switch control box (3). Two primary transmission links (402) are symmetrically arranged on the right side of the normally closed trigger switch (401), and the two primary transmission links (402) are distributed on both sides inside the switch control box (3). A link guide seat (403) is fixedly installed inside the switch control box (3) at the position corresponding to the primary transmission link (402). A guide groove is opened in the middle of the link guide seat (403), and the primary transmission link (402) is slidably connected to the guide of the link guide seat (403). Inside the slot, the end of the primary transmission link (402) away from the normally closed trigger switch (401) is provided with a hinge hole. The hinge hole is hinged to the secondary transmission link (404) by a pin. There are two secondary transmission links (404), which correspond one-to-one with the primary transmission link (402) and are symmetrically distributed on both sides inside the switch control box (3). The end of the secondary transmission link (404) away from the primary transmission link (402) is hinged to a rotating hinge seat (405), and a fixed hinge shaft passes through it. The rotating hinge seat (405) rotates around the fixed hinge shaft, and the two ends of the fixed hinge shaft are fixedly installed on the inner wall of the switch control box (3).

2. The anti-pinch protection mechanism for elevator doors according to claim 1, characterized in that: Both ends of the primary transmission link (402) are provided with buffer structures. One end is attached to the contact of the normally closed trigger switch (401). The buffer structure at this end is a rubber buffer sleeve fitted on the end of the primary transmission link (402). The rubber buffer sleeve is made of EPDM rubber. The other end extends to the outside through the through hole opened on the right side wall of the switch control box (3). This end is attached to the inner side wall of the anti-pinch trigger panel (9). The inner wall of the through hole on the right side wall of the switch control box (3) is provided with a rubber sealing ring. The rubber sealing ring is attached to the outer periphery of the primary transmission link (402).

3. The anti-pinch protection mechanism for elevator doors according to claim 1, characterized in that: The spring positioning seat (8) has an annular limiting protrusion inside. The annular limiting protrusion is a boss structure integrally formed on the inner wall of the spring positioning seat (8). The top of the anti-pinch reset spring (7) is fitted with a circular spring seat. An annular limiting groove is opened on the outer periphery of the spring seat. The width of the annular limiting groove is adapted to the height of the annular limiting protrusion inside the spring positioning seat (8).

4. The anti-pinch protection mechanism for elevator doors according to claim 1, characterized in that: The flexible buffer pad (10) is made of silicone. Hemispherical protrusions are evenly distributed on the side of the surface facing the elevator door. The flexible buffer pad (10) is glued and fixed to the anti-pinch trigger panel (9) with food-grade silicone glue.

5. The anti-pinch protection mechanism for elevator doors according to claim 1, characterized in that: The inner wall of the guide groove of the connecting rod guide seat (403) is covered with a polytetrafluoroethylene wear-resistant layer, and both ends of the guide groove are provided with flared guide parts.

6. The anti-pinch protection mechanism for elevator doors according to claim 1, characterized in that: The hinge between the secondary transmission link (404) and the rotary hinge seat (405) is provided with a brass bushing. The inner diameter of the brass bushing is adapted to the outer diameter of the hinge pin. The length of the bushing is equal to the thickness of the rotary hinge seat (405), and both ends of the bushing are flush with the two side walls of the rotary hinge seat (405). The inner wall of the bushing is coated with lithium-based grease.

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