A safety protection device for elevator maintenance

Abstract

The present invention is applicable to the technical field of elevator maintenance protection brackets, and provides a safety protection device for elevator maintenance, including an elevator shaft pit and a protection bracket arranged in the elevator shaft pit, the protection bracket including two protection top plates, the two protection top plates are arranged in the elevator shaft pit in a mirror-like manner, and rotating shafts are arranged on the front and rear side surfaces on opposite sides of the two protection top plates, and the other end of the rotating shaft is rotatably connected to the inner wall of the elevator shaft pit, and multiple supporting rotating plates are hinged on the left and right inner walls of the elevator shaft pit, the lower surface of the protection top plate is provided with a groove, and the lower side of the protection top plate is provided with multiple supporting components. The present invention is provided with a supporting component, and when the supporting rotating plate supports the protective top plate, the supporting rotating plate can be secondary tightened and fixed, thereby strengthening the supporting effect of the supporting rotating plate on the protective top plate, and avoiding the problem of loosening of the supporting rotating plate due to the falling of the car as much as possible, and further increasing the protection effect of the safety protection device.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator maintenance protection brackets, and more specifically, to a safety protection device for elevator maintenance. Background Art

[0002] The part of the shaft below the lowest floor station served by the car is called the pit, which is equipped with buffers, elevator stop switches, shaft light switches, power sockets and lighting. During daily use, the electrical appliances in the elevator shaft pit need to be inspected and maintained to ensure the stability of the daily operation of the elevator.

[0003] However, the elevator pit lacks safety protection for maintenance personnel. It is only equipped with a buffer for the car. However, the height of most existing buffers is generally 500 mm, which is far lower than the height of a normal person. If the maintenance personnel are performing maintenance in the elevator pit and the car suddenly falls, if the maintenance personnel are standing at this time, the fall of the car can easily cause an impact on the maintenance personnel's head, affecting the maintenance personnel's safety during maintenance. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a safety protection device for elevator maintenance.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A safety protection device for elevator maintenance comprises an elevator shaft pit and a protection bracket arranged in the elevator shaft pit, the protection bracket comprises two protection top plates, the two protection top plates are arranged in the elevator shaft pit in a mirror-like manner, rotating shafts are arranged on the front and rear surfaces on opposite sides of the two protection top plates, the other ends of the rotating shafts are rotatably connected to the inner wall of the elevator shaft pit, a plurality of support rotating plates are hinged on the left and right inner walls of the elevator shaft pit, a plurality of grooves matching the upper sides of the support rotating plates are arranged on the lower surface of the protection top plates, a plurality of support components are arranged on the lower side of the protection top plates, the support components comprise external support columns, the external support columns are arranged on the lower side of the protection top plates, pushing cavities are arranged inside the left and right sides of the elevator shaft pit, a plurality of pushing rods are arranged on the side surface of the external support columns close to the pushing cavities, and the pushing The other end of the rod slides through the pushing cavity, and a synchronous plate is provided at one end of the multiple pushing rods located in the pushing cavity, and a pulling rod is provided on the outer side of the supporting rotating plate. A through groove connected to the pushing cavity is opened on the inner wall of the elevator shaft pit near the pulling rod, and one end of the pulling rod slides into the pushing cavity through the through groove and is connected with the synchronous plate, and a pushing plate is provided at one end of the pulling rod near the supporting rotating plate, and the pushing plate contacts the outer surface of the lower side of the supporting rotating plate, and a first spring movably sleeved on the outer surface of the pulling rod is provided between the synchronous plate and the inner wall of the pushing cavity, a top telescopic support assembly is provided on the top of the external support column, a bottom telescopic support assembly is provided on the bottom of the external support column, a bottom support assembly that supports the bottom of the external support column is provided on the bottom wall of the elevator shaft pit, and a buffer assembly is provided on the upper side of the two protective top plates.

[0007] The present invention is further configured as follows: the top telescopic support assembly includes a top support column, the top support column is arranged on the upper side of the external support column, a top push cavity is opened on the top of the external support column, the top end of the top support column is an inclined surface, and its lower end slides through the top push cavity, the bottom wall of the top push cavity is rotatably connected with a transmission shaft, the upper end of the transmission shaft is arranged on the first screw rod, and the lower surface of the top support column is opened with a first thread groove threadedly sleeved on the outer surface of the first screw rod.

[0008] The present invention is further configured as follows: a first bevel gear is sleeved on the outer surface of the transmission shaft, and a second bevel gear is meshed and connected on the lower side of the first bevel gear. A secondary transmission shaft is arranged on the surface of the second bevel gear facing away from the transmission shaft, and the other end of the secondary transmission shaft slides through the outer surface of the external support column, and a main transmission shaft is arranged at one end of the secondary transmission shaft outside the external support column, and the other end of the main transmission shaft rotates and passes through the pushing cavity. A third bevel gear is sleeved on the outer surface of the main transmission shaft located in the pushing cavity, and a mounting plate is arranged on the inner wall of the pushing cavity close to the main transmission shaft, and a rotating shaft is rotatably sleeved on the mounting plate, and a fourth bevel gear meshed with the third bevel gear is arranged at the lower end of the rotating shaft, and a first gear is arranged on the upper end of the rotating shaft, and a first rack is arranged on the lower surface of the pushing rod close to the first gear, the first rack is meshed and connected with the first gear, and the first rack slides into the bottom pit of the elevator shaft as the pushing rod slides.

[0009] The present invention is further configured as follows: an extension groove is provided on the surface of one side of the main transmission shaft close to the auxiliary transmission shaft, one end of the auxiliary transmission shaft close to the main transmission shaft extends into the extension groove and slides in the extension groove, a limiting slider is provided on the outer surface of the auxiliary transmission shaft, and a limiting slide groove is provided on the inner wall of the extension groove that is adapted to the limiting slider and extends out of the side of the main transmission shaft.

[0010] The present invention is further configured as follows: the bottom telescopic support assembly includes a bottom support column, the bottom support column is arranged on the lower side of the external support column, a bottom pushing cavity is opened at the bottom of the external support column, the upper end of the bottom support column slides through the bottom pushing cavity, the lower end of the transmission shaft rotates and passes through the bottom pushing cavity, a second screw is arranged at the lower end of the transmission shaft, the second screw has an opposite thread to the first screw, and a second thread groove is opened on the upper surface of the bottom support column and is threadedly sleeved on the outer surface of the second screw.

[0011] The present invention is further configured as follows: the bottom support assembly includes an inclined top plate, which is arranged on the bottom wall of the elevator shaft pit, and a storage groove adapted to the inclined top plate is opened on the bottom wall of the elevator shaft pit, and an installation shaft is rotatably connected between the inner walls on both sides of the front and rear of the storage groove, and the side of the inclined top plate close to the external support column is sleeved on the outer surface of the installation shaft.

[0012] The present invention is further configured as follows: a second gear is sleeved on the outer surface of the mounting shaft, a second rack is meshingly connected on the lower side of the second gear, a connecting rod is arranged on the side of the second rack facing the external support column, a bottom cavity is opened in the bottom wall of the elevator shaft pit, the other end of the connecting rod slides through the bottom cavity, a T-shaped shaft is arranged in the bottom cavity, a corner of the bottom support column facing the T-shaped shaft is an inclined surface, the upper end of the T-shaped shaft vertical rod slides through the bottom wall of the elevator shaft pit and contacts the inclined surface on the lower side of the bottom support column, a tension spring movably sleeved on the outer surface of the T-shaped shaft vertical rod is arranged between the T-shaped shaft cross plate and the top wall of the bottom cavity, and a rotating plate is hinged between the lower surface of the T-shaped shaft cross plate and the connecting rod.

[0013] The present invention is further configured as follows: the buffer assembly includes a buffer plate, which is arranged on the upper side of the protective top plate, a shrinkage cavity is opened in the protective top plate, the side of the buffer plate close to the protective top plate slides through the shrinkage cavity, a plurality of supporting springs are arranged between the surface of the buffer plate that penetrates into the shrinkage cavity and the inner wall of the shrinkage cavity, a plurality of docking grooves are opened on the opposite surfaces of the two protective top plates, the docking grooves on the two protective top plates are arranged alternately, a plurality of docking blocks are arranged in the shrinkage cavity, one side of the docking block slides through the outer surface of the protective top plate and is adapted to the docking groove, and a movable rotating plate is hinged between the docking block and the lower side of the buffer plate.

[0014] The present invention is further configured as follows: a built-in cavity located on the upper side of the pushing cavity is opened in the inner wall of the elevator shaft pit, a locking rod is arranged in the built-in cavity, the lower end of the locking rod slides and passes through the through groove, the upper surface of the pulling rod is opened with a locking groove adapted to the lower end of the locking rod, the upper outer surface of the locking rod is provided with a built-in plate, a second spring movably sleeved on the outer surface of the locking rod is arranged between the built-in plate and the bottom wall of the built-in cavity, the upper end of the locking rod is hinged with a built-in rotating plate, the upper side of the built-in rotating plate is hinged with a trigger push rod, the other end of the trigger push rod slides through the inner wall of the elevator shaft pit, the side of the buffer plate away from the docking block is also hinged with a movable rotating plate, the other side of the movable rotating plate is hinged with an extrusion rod, the other end of the extrusion rod slides through the outer surface of the protective top plate and contacts the trigger push rod.

[0015] The advantages of the present invention are:

[0016] First, the present invention is provided with a support assembly, which can perform secondary tightening and fixing of the support rotating plate when the support rotating plate supports the protective top plate, thereby strengthening the supporting effect of the support rotating plate on the protective top plate, and avoiding the problem of loosening of the support rotating plate due to the falling of the car as much as possible, thereby further increasing the protective effect of the safety protection device.

[0017] Secondly, the present invention is provided with a bottom telescopic support assembly, which avoids the problem of the bottom of the bottom support column directly contacting and sliding with the bottom wall of the elevator pit and getting stuck during the displacement of the external support column, thereby ensuring the smoothness of the displacement of the external support column.

[0018] Thirdly, the present invention arranges a bottom support assembly, which can automatically control the inclined top plate to support the bottom of the external support column during the extension of the bottom support column, thereby improving the firmness of the support assembly for the support rotating plate and reducing the operating steps for supporting the protective top plate.

[0019] Fourthly, the present invention can reduce the impact force of the car on the protective top plate by providing a buffer component, and at the same time, the two protective top plates can be connected together when the car falls, thereby strengthening the supporting effect of the two protective top plates on the car and improving the protection effect on maintenance personnel in the elevator shaft.

[0020] Fifth, when the car falls and impacts the protective top plate, the present invention automatically locks the pulling rod, avoiding the displacement of the external support column when the car falls, further ensuring the supporting effect of the support rotating plate, and improving the safety protection effect of the maintenance personnel at the bottom of the elevator pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a safety protection device for elevator maintenance according to the present invention;

[0022] Figure 2 It is a front plan view of the internal structure of the elevator shaft pit of the present invention;

[0023] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0025] Figure 5 for Figure 2 Enlarged view of point C in the middle;

[0026] Figure 6 It is a schematic diagram of the connection structure between the main transmission shaft and the auxiliary transmission shaft of the present invention;

[0027] Figure 7 for Figure 2 Enlarged view of point D in the middle;

[0028] Figure 8 for Figure 1 Enlarged view of point E in the middle.

[0029] In the figure: 1. Elevator shaft pit; 2. Rotating shaft; 3. Protective top plate; 4. Support rotating plate; 5. Groove;

[0030] 6. Support assembly; 61. External support column; 62. Push rod; 63. Push chamber; 64. Pull rod; 65. Push plate; 66. Synchronous plate; 67. First spring; 68. Top push chamber; 69. Top support column; 610. Transmission shaft; 611. First screw; 612. First bevel gear; 613. Main transmission shaft; 614. Secondary transmission shaft; 615. Second bevel gear; 616. Third bevel gear; 617. Mounting plate; 618. Rotation shaft; 619. Fourth bevel gear; 620. First gear; 621. First rack; 622. Bottom push chamber; 623. Bottom support column; 624. Second screw; 625. Extension slot; 626. Limiting slider;

[0031] 7. Bottom support assembly; 71. Inclined top plate; 72. Storage slot; 73. Mounting shaft; 74. Second gear; 75. Second rack; 76. Bottom cavity; 77. Connecting rod; 78. Rotating plate; 79. T-shaped shaft; 710. Tension spring;

[0032] 8. Buffer assembly; 81. Buffer plate; 82. Contraction chamber; 83. Support spring; 84. Docking block; 85. Docking groove; 86. Movable rotating plate; 87. Extrusion rod;

[0033] 9. Built-in cavity; 10. Locking rod; 11. Locking groove; 12. Built-in plate; 13. Second spring; 14. Trigger push rod; 15. Built-in rotating plate. DETAILED DESCRIPTION

[0034] See also Figure 1-8 , the present invention provides the following technical solutions:

[0035] Specifically, it refers to a safety protection device for elevator maintenance, including an elevator shaft pit 1 and a protection bracket arranged in the elevator shaft pit 1, the protection bracket includes two protection top plates 3, the two protection top plates 3 are arranged in the elevator shaft pit 1 in a mirror image, and rotating shafts 2 are arranged on the front and rear surfaces on opposite sides of the two protection top plates 3, and the other end of the rotating shaft 2 is rotatably connected to the inner wall of the elevator shaft pit 1, and multiple support rotating plates 4 are hinged on the left and right inner walls of the elevator shaft pit 1. The lower surface of the protection top plate 3 is provided with multiple grooves 5 adapted to the upper side of the support rotating plate 4. When the maintenance personnel enter the elevator shaft pit 1 for maintenance or cleaning, the protection top plate 3 is first turned flat, and then the upper side of the support rotating plate 4 is inserted into the groove 5, so that the support rotating plate 4 forms a supporting effect on the protection top plate 3. In this way, when the maintenance personnel perform maintenance in the elevator shaft pit 1, the two protection top plates 3 can form a protective effect on the maintenance personnel's head, and try to avoid the car sliding during the maintenance process. The impact on personnel safety is further guaranteed, and the safety of the staff during maintenance is further guaranteed.

[0036] In other embodiments, an electric push rod may be provided between the support rotating plate 4 and the inner wall of the elevator shaft pit 1, so that the protective top plate 3 can be opened or closed by remote control.

[0037] A plurality of support assemblies 6 are provided on the lower side of the protective top plate 3. The support assemblies 6 include an external support column 61, which is provided on the lower side of the protective top plate 3. Push cavities 63 are provided inside the left and right sides of the elevator shaft pit 1. A plurality of push rods 62 are provided on the surface of one side of the external support column 61 close to the push cavity 63. The other end of the push rod 62 slides through the push cavity 63. A synchronous plate 66 is provided on one end of the plurality of push rods 62 located in the push cavity 63. A pulling rod 64 is provided on the outer side of the support rotating plate 4. A through groove communicating with the pushing cavity 63 is provided on the inner wall of the elevator shaft pit 1 close to the pulling rod 64. One end of the pulling rod 64 slides and extends into the pushing cavity 63 through the through groove and is connected with the synchronous plate 66. A pushing plate 65 is provided on the end of the pulling rod 64 close to the support rotating plate 4. The pushing plate 65 contacts the outer surface of the lower side of the support rotating plate 4. A first spring 67 movably sleeved on the outer surface of the pulling rod 64 is provided between the synchronous plate 66 and the inner wall of the pushing cavity 63. When the first spring 67 is not squeezed, the first spring 67 will form a thrust on the synchronous plate 66, so that the synchronous plate 66 is located on the side away from the supporting rotating plate 4. Therefore, the pushing plate 65 will form a pulling force on the supporting rotating plate 4, so that the initial state of the supporting rotating plate 4 is vertical, which is convenient for the storage of the protective top plate 3 and will not affect the protective top plate 3. When the supporting rotating plate 4 needs to support the protective top plate 3, it is necessary to pull the upper side of the supporting rotating plate 4, so that the supporting rotating plate 4 will form a pulling force on the pushing plate 65 and pull the pulling rod 64 to move outward. At this time, the pulling rod 64 synchronously pulls the synchronous plate 66 to move, and the first spring 67 is stressed and compressed. Therefore, multiple pushing rods 62 push the external support column 61 to move to the side away from the inner wall of the elevator shaft pit 1. When the protective top plate 3 is not needed to be supported, the supporting rotating plate 4 will be pulled to the initial position by the first spring 67, and the external support column 61 will move to the inner wall close to the elevator shaft pit 1, thereby not blocking the up and down movement of the elevator car.

[0038] In the present solution, since the push plate 65 is in contact with the outer surface of the lower side of the support rotating plate 4, according to the lever principle, the upper force arm of the support rod is longer, and the longer force arm saves effort, which reduces the difficulty of pulling for the staff. When multiple support rotating plates 4 are arranged between them, a synchronization plate 66 can also be set, so that only one support rotating plate 4 needs to be pulled to rotate synchronously.

[0039] A top push cavity 68 is provided at the top of the external support column 61, and a top support column 69 is arranged in the top push cavity 68. The top end of the top support column 69 is an inclined surface, and slides through the upper surface of the external support column 61. The bottom wall of the top push cavity 68 is rotatably connected to a transmission shaft 610. The upper end of the transmission shaft 610 is arranged on the first screw 611, and the lower surface of the top support column 69 is provided with a first thread groove threadedly sleeved on the outer surface of the first screw 611. When in use, by controlling the rotation of the transmission shaft 610, the first screw 611 rotates synchronously with the transmission shaft 610, so that the top support column 69 can be displaced upward or downward under the transmission of the first screw 611 and the first thread groove.

[0040] The outer surface of the transmission shaft 610 is sleeved with a first bevel gear 612, and the lower side of the first bevel gear 612 is meshedly connected with a second bevel gear 615, and a secondary transmission shaft 614 is arranged on the surface of the second bevel gear 615 facing away from the transmission shaft 610, and the other end of the secondary transmission shaft 614 slides through the outer surface of the external support column 61, and the end of the secondary transmission shaft 614 located outside the external support column 61 is provided with a main transmission shaft 613, and the other end of the main transmission shaft 613 rotates and passes through the push chamber 63, and the main transmission shaft 614 is provided with a main transmission shaft 613. A third bevel gear 616 is sleeved on the outer surface of the push chamber 63, a mounting plate 617 is provided on the inner wall of the push chamber 63 close to the main transmission shaft 613, a rotating shaft 618 is rotatably sleeved on the mounting plate 617, a fourth bevel gear 619 meshingly connected to the third bevel gear 616 is provided at the lower end of the rotating shaft 618, a first gear 620 is provided at the upper end of the rotating shaft 618, a first rack 621 is provided on the lower surface of the push rod 62 close to the first gear 620, and the first rack 621 is meshed with the third bevel gear 616. The first gear 620 is meshed and connected, and the first rack 621 slides into the elevator shaft pit 1 with the push rod 62. Therefore, when the push rod 62 pushes the external support column 61 to move outward, the first rack 621 moves synchronously with the push rod 62, so that the first rack 621 meshes and transmits the first gear 620 to rotate. In this way, the main transmission shaft 613 rotates under the transmission of the third bevel gear 616 and the fourth bevel gear 619, thereby achieving the purpose of driving the secondary transmission shaft 614 to rotate. The transmission shaft 610 rotates synchronously under the transmission of the first bevel gear 612 and the second bevel gear 615, so that the first screw 611 drives the top support column 69 to move upward. When the support turn plate 4 supports the protective top plate 3, the upper side of the top support column 69 contacts the lower surface of the support turn plate 4 and forms a supporting effect on the support turn plate 4. The above structure is adopted to ensure the strength of the support turn plate 4, and the problem of the support turn plate 4 breaking due to the falling of the car is avoided as much as possible, and the protection effect of the safety protection device is further increased.

[0041] An extension groove 625 is provided on the surface of one side of the main transmission shaft 613 close to the auxiliary transmission shaft 614. One end of the auxiliary transmission shaft 614 close to the main transmission shaft 613 extends into the extension groove 625 and slides in the extension groove 625. A limiting slider 626 is provided on the outer surface of the auxiliary transmission shaft 614. A limiting slide groove adapted to the limiting slider 626 and extending from the side of the main transmission shaft 613 is provided on the inner wall of the extension groove 625. When the push rod 62 pushes the external support column 61 to move, the auxiliary transmission shaft 614 will move with the push rod 62. As the external support column 61 moves, the secondary transmission shaft 614 drives the limiting slider 626 to slide in the limiting slide groove. When the main transmission shaft 613 rotates, the secondary transmission shaft 614 is affected by the limiting slider 626, so the secondary transmission shaft 614 will rotate synchronously with the main transmission shaft 613. The above structure can control the displacement of the top support column 69 after the displacement of the external support column 61 is adjusted, thereby avoiding the problem of transmission failure or jamming between the main transmission shaft 613 and the secondary transmission shaft 614 as much as possible.

[0042] A bottom support assembly 7 for supporting the bottom of the external support column 61 is arranged on the bottom wall of the elevator shaft pit 1. The bottom support assembly 7 includes an inclined top plate 71, which is arranged on the bottom wall of the elevator shaft pit 1. A storage groove 72 adapted to the inclined top plate 71 is opened on the bottom wall of the elevator shaft pit 1. A mounting shaft 73 is rotatably connected between the inner walls on both sides of the front and rear of the storage groove 72. The side of the inclined top plate 71 close to the external support column 61 is sleeved on the outer surface of the mounting shaft 73. When the inclined top plate 71 rotates to a horizontal state, The inclined top plate 71 is stored in the storage groove 72. When the top support column 69 supports the support rotating plate 4, the external support column 61 moves to the specified position. At this time, the inclined top plate 71 rotates upward with the installation shaft 73 as the rotation point, so that the side of the inclined top plate 71 away from the installation shaft 73 contacts the bottom of the external support column 61. Therefore, the inclined top plate 71 forms a supporting effect on the bottom of the external support column 61, further improving the supporting effect of the external support column 61 on the support rotating plate 4, and ensuring the firmness of the safety protection device.

[0043] A second gear 74 is sleeved on the outer surface of the mounting shaft 73, and a second rack 75 is meshedly connected to the lower side of the second gear 74. A connecting rod 77 is provided on the side of the second rack 75 facing the external support column 61. A bottom cavity 76 is opened in the bottom wall of the elevator shaft pit 1, and the other end of the connecting rod 77 slides into the bottom cavity 76. A T-shaped shaft 79 is arranged in the bottom cavity 76, and the upper end of the vertical rod of the T-shaped shaft 79 slides through the bottom wall of the elevator shaft pit 1. A tension spring 710 movably sleeved on the outer surface of the vertical rod of the T-shaped shaft 79 is arranged between the cross plate of the T-shaped shaft 79 and the top wall of the bottom cavity 76, and a rotating plate 78 is hinged between the lower surface of the cross plate of the T-shaped shaft 79 and the connecting rod 77. When the tension spring 710 is not pulled, the tension spring 710 will form a pulling force on the cross plate of the T-shaped shaft 79, so that most of the upper end of the vertical rod of the T-shaped shaft 79 extends out of the bottom wall of the elevator shaft pit 1.

[0044] A bottom push cavity 622 is provided at the bottom of the external support column 61, and the lower end of the transmission shaft 610 rotates and penetrates into the bottom push cavity 622. A second screw 624 is provided at the lower end of the transmission shaft 610, and the second screw 624 has a thread opposite to that of the first screw 611. A bottom push cavity 622 is provided with a bottom support column 623 whose lower end slides through the lower surface of the external support column 61, and a second thread groove is provided on the upper surface of the bottom support column 623, which is threadedly sleeved on the outer surface of the second screw 624. The corner of 623 facing the T-shaped shaft 79 is an inclined surface. Therefore, when the transmission shaft 610 rotates, since the second screw rod 624 and the first screw rod 611 have opposite threads, the bottom support column 623 moves downward under the thread transmission of the second screw rod 624. During the downward movement of the bottom support column 623, the inclined surface will contact the upper end of the vertical rod of the T-shaped shaft 79, thereby squeezing the T-shaped shaft 79, causing the T-shaped shaft 79 to move downward. At the same time, the tension spring 710 is stressed and stretched, and the rotating plate 78 pushes the connecting rod 77. The force causes the connecting rod 77 to push the second rack 75 to move toward one side of the inclined top plate 71. At this time, the second rack 75 meshes and transmits the second gear 74 to rotate counterclockwise, and the mounting shaft 73 synchronously drives the inclined top plate 71 to rotate counterclockwise. When the external support column 61 is displaced to the specified position, the bottom support column 623 pushes the distance to the maximum, and the bottom support column 623 contacts the bottom wall of the elevator shaft pit 1. At the same time, the T-shaped shaft 79 moves downward to the longest distance, so that the inclined top plate 71 rotates to contact the outer surface of the bottom of the external support column 61. The above structure can automatically control the inclined top plate 71 to support the bottom of the external support column 61 during the extension of the bottom support column 623, reducing the operation steps when supporting the protective top plate 3. At the same time, the retractable bottom support column 623 is used to avoid the problem of the bottom of the bottom support column 623 directly contacting and sliding with the bottom wall of the elevator shaft pit 1 during the displacement of the external support column 61, thereby ensuring the smoothness of the displacement of the external support column 61.

[0045] A buffer assembly 8 is provided on the upper side of the two protective top plates 3, and the buffer assembly 8 includes a buffer plate 81, which is provided on the upper side of the protective top plate 3. A contraction cavity 82 is opened in the protective top plate 3, and the buffer plate 81 slides into the contraction cavity 82 on the side close to the protective top plate 3. There are multiple support springs 83 between the surface of the buffer plate 81 that passes through the contraction cavity 82 and the inner wall of the contraction cavity 82. When the car suddenly falls, the bottom of the car contacts the upper side of the buffer plate 81, so that the buffer plate 81 is stressed and displaced downward, and at the same time, the support spring 83 is stressed and compressed, thereby achieving the purpose of buffering between the car and the protective top plate 3 and reducing the impact force on the protective top plate 3.

[0046] A plurality of docking grooves 85 are provided on the opposite surfaces of the two protective top plates 3. The docking grooves 85 on the two protective top plates 3 are arranged in an alternating manner. A plurality of docking blocks 84 are arranged in the contraction cavity 82. One side of the docking block 84 slides through the outer surface of the protective top plate 3 and fits with the docking groove 85. A movable rotating plate 86 is hinged between the docking block 84 and the lower side of the buffer plate 81. In this way, when the buffer plate 81 moves downward, the buffer plate 81 will squeeze the movable rotating plate 86, so that the movable rotating plate 86 forms a thrust on the docking block 84, thereby pushing the docking block 84 out of the protective top plate 3. Therefore, the extended docking block 84 can be displaced into the docking groove 85 of the other protective top plate 3. The above structure can make the two protective top plates 3 connected together when the car falls, thereby strengthening the supporting effect of the two protective top plates 3 on the car and improving the protection effect on the maintenance personnel in the elevator shaft.

[0047] The inner wall of the elevator shaft pit 1 is provided with a built-in cavity 9 located on the upper side of the push cavity 63, and a locking rod 10 is arranged in the built-in cavity 9. The lower end of the locking rod 10 slides through the through groove, and the upper surface of the pulling rod 64 is provided with a locking groove 11 adapted to the lower end of the locking rod 10. When the top support column 69 supports the support rotating plate 4, the locking groove 11 moves to the right below the locking rod 10, and the upper end outer surface of the locking rod 10 is provided with a built-in plate 12, and a locking plate 12 is provided between the built-in plate 12 and the bottom wall of the built-in cavity 9. A second spring 13 is movably sleeved on the outer surface of the locking rod 10. When the second spring 13 is not squeezed, the second spring 13 will form a supporting effect on the built-in plate 12, so that the initial position of the locking rod 10 is retracted to the inside of the elevator shaft pit 1. The upper end of the locking rod 10 is hinged with a built-in rotating plate 15, and the upper side of the built-in rotating plate 15 is hinged with a trigger push rod 14. The other end of the trigger push rod 14 slides through the inner wall of the elevator shaft pit 1, and the buffer plate 81 is away from the side of the docking block 84. The same hinged movable rotating plate 86 is provided, and the other side of the movable rotating plate 86 is hinged with an extrusion rod 87. The other end of the extrusion rod 87 slides through the outer surface of the protective top plate 3 and contacts the trigger push rod 14. When the buffer plate 81 is impacted, the buffer plate 81 moves downward. At this time, the movable rotating plate 86 will form a thrust on the extrusion rod 87, causing the extrusion rod 87 to move toward the outside of the protective top plate 3. Therefore, the extrusion rod 87 squeezes the trigger push rod 14, causing the trigger push rod 14 to move into the built-in cavity 9. At this time, the built-in rotating plate 15 causes the locking rod 10 to move downward. At the same time, the second spring 13 is stressed and contracts. Since the locking groove 11 is located directly below the locking rod 10, the locking rod 10 moves into the locking groove 11, thereby completing the locking of the pulling rod 64. This method avoids the displacement of the external support column 61 when the car falls, further ensures the supporting effect of the support rotating plate 4, and improves the safety protection effect of the maintenance personnel at the bottom of the elevator shaft pit 1.

[0048] The working principle of the safety protection device for elevator maintenance provided by the present invention is as follows:

[0049] The first step is that when the maintenance personnel enter the bottom of the elevator pit 1 for maintenance, they first rotate the protective top plate 3 to a horizontal state, then pull the upper side of the support rotating plate 4 to rotate the support rotating plate 4, and finally insert the top of the support rotating plate 4 into the groove 5;

[0050] The second step is that the support rotating plate 4 will form a pulling force on the push plate 65 during the rotation process, and pull the pulling rod 64 to move outward. At this time, the pulling rod 64 synchronously pulls the synchronous plate 66 to move, and the first spring 67 is stressed and compressed. Therefore, multiple push rods 62 push the external support column 61 to move to the side away from the inner wall of the elevator shaft pit 1, and the first rack 621 is synchronously displaced with the push rod 62, so that the first rack 621 meshes and drives the first gear 620 to rotate, so that the main transmission shaft 613 rotates under the transmission of the third bevel gear 616 and the fourth bevel gear 619, thereby achieving the purpose of driving the secondary transmission shaft 614 to rotate, and the transmission shaft 610 rotates synchronously under the transmission of the first bevel gear 612 and the second bevel gear 615, and the top support column 69 moves upward under the transmission of the first screw 611 and the first thread groove. When the support rotating plate 4 supports the protective top plate 3, the top surface of the top support column 69 contacts the lower side of the support rotating plate 4 and supports the support rotating plate 4;

[0051] Step 3: When the transmission shaft 610 rotates, since the second screw 624 and the first screw 611 have opposite threads, the bottom support column 623 moves downward under the thread transmission of the second screw 624. During the downward movement of the bottom support column 623, the inclined surface will contact the upper end of the vertical rod of the T-shaped shaft 79, thereby squeezing the T-shaped shaft 79, causing the T-shaped shaft 79 to move downward. At the same time, the tension spring 710 is stressed and stretched, and the rotating plate 78 will form a thrust on the connecting rod 77, so that the connecting rod 77 pushes the second rack 75. It moves to one side of the inclined top plate 71. At this time, the second rack 75 meshes and transmits the second gear 74 to rotate counterclockwise. The mounting shaft 73 simultaneously drives the inclined top plate 71 to rotate counterclockwise. When the external support column 61 moves to the specified position, the bottom support column 623 pushes the distance to the maximum, and the bottom support column 623 contacts the bottom wall of the elevator shaft pit 1. At the same time, the T-shaped shaft 79 moves downward by the longest distance, so that the inclined top plate 71 rotates to contact the outer surface of the bottom of the external support column 61.

Claims

1. A safety protection device for elevator maintenance, comprising an elevator shaft pit (1) and a protection bracket arranged in the elevator shaft pit (1), characterized in that: The protective bracket comprises two protective top plates (3), the two protective top plates (3) are arranged in a mirror image in the elevator shaft pit (1), and a rotating shaft (2) is arranged on the front and rear surfaces of the two opposite sides of the two protective top plates (3), and the other end of the rotating shaft (2) is rotatably connected to the inner wall of the elevator shaft pit (1), and a plurality of supporting rotating plates (4) are hinged on the inner walls of the left and right sides of the elevator shaft pit (1), and a plurality of grooves (5) adapted to the upper side of the supporting rotating plates (4) are provided on the lower surface of the protective top plate (3), and a plurality of supporting components (6) are arranged on the lower side of the protective top plate (3); The support assembly (6) comprises an external support column (61), the external support column (61) being arranged on the lower side of the protective top plate (3), a push cavity (63) being provided inside the left and right sides of the elevator shaft pit (1), a plurality of push rods (62) being provided on the surface of one side of the external support column (61) close to the push cavity (63), the other end of the push rod (62) slidingly passing through the push cavity (63), a synchronization plate (66) being provided on one end of the plurality of push rods (62) located in the push cavity (63), a pulling rod (64) being provided on the outer side of the support rotating plate (4), a through groove communicating with the push cavity (63) being provided on the inner wall of the elevator shaft pit (1) close to the pulling rod (64), one end of the pulling rod (64) slidingly passing through the through groove The pull rod (64) is movably extended into the push chamber (63) and connected to the synchronization plate (66); a push plate (65) is provided at one end of the pull rod (64) close to the support rotating plate (4); the push plate (65) contacts the outer surface of the lower side of the support rotating plate (4); a first spring (67) movably sleeved on the outer surface of the pull rod (64) is provided between the synchronization plate (66) and the inner wall of the push chamber (63); a top telescopic support assembly is provided at the top of the external support column (61); a bottom telescopic support assembly is provided at the bottom of the external support column (61); a bottom support assembly (7) supporting the bottom of the external support column (61) is provided on the bottom wall of the elevator shaft pit (1); and a buffer assembly (8) is provided on the upper side of the two protective top plates (3).

2. A safety protection device for elevator maintenance according to claim 1, characterized in that: The top telescopic support assembly comprises a top support column (69), the top support column (69) being arranged on the upper side of the external support column (61), a top push cavity (68) being provided at the top of the external support column (61), the top end of the top support column (69) being an inclined surface, and the lower end thereof slidingly penetrates into the top push cavity (68), the bottom wall of the top push cavity (68) being rotatably connected to a transmission shaft (610), the upper end of the transmission shaft (610) being provided with a first screw rod (611), and a first thread groove being threadedly sleeved on the outer surface of the first screw rod (611) being provided on the lower surface of the top support column (69).

3. A safety protection device for elevator maintenance according to claim 2, characterized in that: The outer surface of the transmission shaft (610) is sleeved with a first bevel gear (612), the lower side of the first bevel gear (612) is meshingly connected with a second bevel gear (615), a secondary transmission shaft (614) is arranged on the surface of the second bevel gear (615) facing away from the transmission shaft (610), the other end of the secondary transmission shaft (614) slides through the outer surface of the external support column (61), a main transmission shaft (613) is arranged at one end of the secondary transmission shaft (614) located outside the external support column (61), the other end of the main transmission shaft (613) rotates and penetrates into the push chamber (63), and a third bevel gear is sleeved on the outer surface of the main transmission shaft (613) located in the push chamber (63). A wheel (616) is provided, and a mounting plate (617) is provided on the inner wall of the push chamber (63) near the main transmission shaft (613); a rotating shaft (618) is rotatably sleeved on the mounting plate (617); a fourth bevel gear (619) meshingly connected to the third bevel gear (616) is provided at the lower end of the rotating shaft (618); a first gear (620) is provided at the upper end of the rotating shaft (618); a first rack (621) is provided on the lower surface of the push rod (62) near the first gear (620); the first rack (621) is meshingly connected to the first gear (620); and the first rack (621) slides along with the push rod (62) and penetrates into the elevator shaft bottom pit (1).

4. A safety protection device for elevator maintenance according to claim 3, characterized in that: An extension groove (625) is provided on a side surface of the main transmission shaft (613) close to the auxiliary transmission shaft (614); one end of the auxiliary transmission shaft (614) close to the main transmission shaft (613) extends into the extension groove (625) and slides in the extension groove (625); a limiting slide block (626) is provided on the outer surface of the auxiliary transmission shaft (614); and a limiting slide groove adapted to the limiting slide block (626) and extending out of the side surface of the main transmission shaft (613) is provided on the inner wall of the extension groove (625).

5. A safety protection device for elevator maintenance according to claim 4, characterized in that: The bottom telescopic support assembly comprises a bottom support column (623), the bottom support column (623) being arranged at the lower side of the external support column (61), the bottom of the external support column (61) being provided with a bottom push cavity (622), the upper end of the bottom support column (623) slidingly passing through the bottom push cavity (622), the lower end of the transmission shaft (610) rotatingly passing through the bottom push cavity (622), the lower end of the transmission shaft (610) being provided with a second screw rod (624), the second screw rod (624) having a thread opposite to that of the first screw rod (611), and the upper surface of the bottom support column (623) being provided with a second thread groove threadedly sleeved on the outer surface of the second screw rod (624).

6. A safety protection device for elevator maintenance according to claim 5, characterized in that: The bottom support assembly (7) comprises an inclined top plate (71), the inclined top plate (71) being arranged on the bottom wall of the elevator shaft pit (1), a receiving groove (72) adapted to the inclined top plate (71) being provided on the bottom wall of the elevator shaft pit (1), a mounting shaft (73) being rotatably connected between the inner walls on both sides of the front and rear of the receiving groove (72), and a side of the inclined top plate (71) close to the external support column (61) being sleeved on the outer surface of the mounting shaft (73).

7. A safety protection device for elevator maintenance according to claim 6, characterized in that: A second gear (74) is sleeved on the outer surface of the mounting shaft (73), a second rack (75) is meshedly connected to the lower side of the second gear (74), a connecting rod (77) is provided on the side of the second rack (75) facing the external support column (61), a bottom cavity (76) is provided in the bottom wall of the elevator shaft pit (1), the other end of the connecting rod (77) slides through the bottom cavity (76), a T-shaped shaft (79) is provided in the bottom cavity (76), and the bottom support column One corner of (623) facing the T-shaped shaft (79) is an inclined surface, the upper end of the vertical rod of the T-shaped shaft (79) slides through the bottom wall of the elevator shaft pit (1) and contacts the inclined surface on the lower side of the bottom support column (623), a tension spring (710) movably sleeved on the outer surface of the vertical rod of the T-shaped shaft (79) is provided between the cross plate of the T-shaped shaft (79) and the top wall of the bottom cavity (76), and a rotating plate (78) is hinged between the lower surface of the cross plate of the T-shaped shaft (79) and the connecting rod (77).

8. A safety protection device for elevator maintenance according to claim 1 or 7, characterized in that: The buffer assembly (8) comprises a buffer plate (81), the buffer plate (81) being arranged on the upper side of the protective top plate (3), a contraction cavity (82) being provided in the protective top plate (3), a side of the buffer plate (81) close to the protective top plate (3) slidingly passing through the contraction cavity (82), a plurality of supporting springs (83) being arranged between the surface of the buffer plate (81) passing through the contraction cavity (82) and the inner wall of the contraction cavity (82), a plurality of docking grooves (85) being arranged on opposite surfaces of the two protective top plates (3), the docking grooves (85) on the two protective top plates (3) being arranged in a staggered manner, a plurality of docking blocks (84) being arranged in the contraction cavity (82), a side of the docking block (84) slidingly passing through the outer surface of the protective top plate (3) and being adapted to the docking groove (85), and a movable rotating plate (86) being hingedly connected between the docking block (84) and the lower side of the buffer plate (81).

9. A safety protection device for elevator maintenance according to claim 8, characterized in that: The inner wall of the elevator shaft pit (1) is provided with a built-in cavity (9) located on the upper side of the pushing cavity (63), a locking rod (10) is arranged in the built-in cavity (9), the lower end of the locking rod (10) slides through the through groove, the upper surface of the pulling rod (64) is provided with a locking groove (11) adapted to the lower end of the locking rod (10), the upper end outer surface of the locking rod (10) is provided with a built-in plate (12), and a second spring (12) movably sleeved on the outer surface of the locking rod (10) is arranged between the built-in plate (12) and the bottom wall of the built-in cavity (9). 13), the upper end of the locking rod (10) is hinged with a built-in rotating plate (15), the upper side of the built-in rotating plate (15) is hinged with a trigger push rod (14), the other end of the trigger push rod (14) slides through the inner wall of the elevator shaft pit (1), and the side of the buffer plate (81) away from the docking block (84) is also hinged with a movable rotating plate (86), the other side of the movable rotating plate (86) is hinged with an extrusion rod (87), the other end of the extrusion rod (87) slides through the outer surface of the protective top plate (3) and contacts the trigger push rod (14).

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