A progressive elevator safety gear

Abstract

The present invention relates to the technical field of elevator safety gear, specifically a progressive elevator safety gear; it includes side plates, and a top plate and a bottom plate respectively fixed at the upper and lower ends of the side plates; two guiding seats are arranged inside the two side plates; a wedge-shaped clamping block is slidably connected through a guiding groove on one side where the two guiding seats are close to each other; a bracket with a supporting groove is arranged at the rear side of the guiding seat; two supporting pins connecting with the clamping block pass through the two supporting grooves from front to back; a pull rod is arranged at the upper end of the bracket and penetrates upward through the top plate; adjusting ears are arranged at the edges where the two guiding seats are far away from each other and face backward; by adjusting the distance between the two guiding seats, the initial distance between the two clamping blocks is changed, so that the safety gear can meet the installation requirements of guide rails with different widths while maintaining a certain safety gap with the guide rail, improving the application range of the safety gear, and the adjustment method is more convenient and fast.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator safety tongs, and more specifically to a progressive elevator safety tong. Background Art

[0002] For a lift elevator operating in a marine environment, its safety guarantee is of crucial importance, and the elevator safety tong is one of the key components. The working principle of a common progressive elevator safety tong is as follows: The safety tong is installed at the bottom of the elevator and can move vertically along the guide rail. During normal operation, the safety tong is in an open state. Once an emergency such as overspeed or out-of-control occurs during the downward movement of the elevator, the speed limiter will trigger relevant actions. A trigger device is provided at the top of the pull rope connected to the safety tong. When the downward movement speed of the safety tong exceeds the specified value, the speed of the pull rope will also exceed the standard, and the flywheel in the trigger device will be stuck due to the centrifugal force, resulting in the pull rope being unable to continue moving downward with the safety tong. At this time, the continued downward movement of the elevator will pull the bracket structure inside the safety tong, and the bracket drives two wedge-shaped clamping mechanisms to move upward and approach each other inside the safety tong, thereby clamping the elevator guide rail to achieve the deceleration and stop of the elevator.

[0003] However, the existing elevator safety tongs have certain technical defects. The two wedge-shaped blocks inside it for clamping the guide rail need to maintain a certain safety distance from the elevator guide rail during the movement process. In the initial state, the safety distance between these two wedge-shaped blocks and the guide rail is fixed, and it can only meet the use requirements of elevator guide rails of a single specification. However, in marine engineering, due to factors such as different usage scenarios and design requirements, the widths of the guide rails of offshore lift elevators have multiple specifications. This design with a fixed safety distance makes the applicable range of the existing safety tongs relatively narrow, unable to flexibly adapt to guide rails of different widths, and difficult to meet the diverse safety requirements of offshore lift elevators, which to a certain extent limits its application in marine engineering. Summary of the Invention

[0004] In order to make up for the deficiencies of the existing technology, the present invention proposes a progressive elevator safety tong. By adjusting the distance between two guide seats, the initial distance between two clamping blocks is changed, so that the safety tong can meet the installation requirements of guide rails of different widths while maintaining a certain safety gap from the guide rail, improving the applicable range of the safety tong, and the adjustment method is relatively convenient and fast.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: A progressive elevator safety clamp of the present invention includes side plates, and a top plate and a bottom plate respectively fixed at the upper and lower ends of the side plates; two guiding seats are arranged inside the two side plates; a wedge-shaped clamping block is slidably connected through a guiding groove on the side facing each other of the two guiding seats; a bracket with a supporting groove is arranged at the rear of the guiding seat; two supporting grooves pass through a supporting pin connected to the clamping block front and back; a pull rod penetrates upward through the top plate at the upper end of the bracket; adjusting ears are arranged at the edges of the two guiding seats away from each other and face backward; a sliding rod penetrates through and is slidably connected to the lower ends of the two adjusting ears left and right; the end of the sliding rod is fixed to the side plate; the upper ends of the two adjusting ears penetrate through and are threadedly driven and connected to a screw rod; the end of the screw rod is rotatably connected to the side plate; the threads at both ends of the screw rod are arranged in opposite directions; a plurality of clamping grooves are evenly arranged on the smooth outer wall of the middle section of the screw rod; a clamping block aligned with the clamping grooves is elastically slidably connected to the lower surface of the top plate.

[0006] Preferably, the upper end of the pull rod penetrates through a corresponding top hole on the top plate; the lower surface of the top plate and the upper end of the bracket are connected by a first spring; the first spring is sleeved on the outer wall of the pull rod; a rope seat is fixed at the upper end of the pull rod; an adjusting bolt is threadedly connected to the outer thread on the outer wall of the pull rod; the adjusting bolt is located in a first hexagonal groove on the upper surface of the top plate.

[0007] Preferably, a second hexagonal groove is arranged at the end of the screw rod; a hexagonal block is slidably connected in the second hexagonal groove; the hexagonal block and the bottom of the second hexagonal groove are connected by a second spring and a first limiting rope; an anti-blocking strip is slidably connected to the inner wall of the clamping groove; the anti-blocking strip and the bottom of the clamping groove are connected by a third spring and a second limiting rope; a groove corresponding to the clamping groove is arranged on the lower surface of the top plate; a fourth spring is connected between the clamping block and the bottom of the groove; the elastic force of the fourth spring is greater than the elastic force of the third spring.

[0008] Preferably, the hexagonal block is slidably and sealingly connected to the second hexagonal groove; the clamping groove is slidably and sealingly connected to the anti-blocking strip; a liquid medium is filled in the second hexagonal groove; the bottom of the second hexagonal groove and the bottom of the clamping groove are communicated through a first liquid hole; the cross section of the clamping block is adapted to the cross section of the anti-blocking strip.

[0009] Preferably, a driving groove is arranged inside the sliding rod; a driving strip is slidably connected up and down in the driving groove; a first tooth groove penetrates downward through the driving groove; a first tooth is slidably connected in the first tooth groove; the first tooth is fixed to the driving strip; the upper surface of the driving strip is connected to the upper groove wall of the driving groove by a fifth spring; the adjusting ear is slidably connected to the sliding rod through a sliding hole; a second tooth groove is arranged at the lower position of the inner wall of the sliding hole; a second tooth is evenly fixed in the second tooth groove; the second tooth is engaged with the first tooth.

[0010] Preferably, the first tooth is slidably and sealingly connected to the first tooth groove; the driving bar is slidably and sealingly connected to the driving groove; the driving bar divides the driving groove into an upper cavity and a lower cavity; the upper cavity is provided with a vent hole penetrating upward; the lower cavity is communicated with the first liquid hole through a second liquid hole.

[0011] Preferably, second hexagonal grooves are provided at both ends of the screw; corresponding hexagonal blocks are slidably and sealingly connected in the second hexagonal grooves respectively.

[0012] Preferably, the elastic force of the second spring, the elastic force of the third spring and the elastic force of the fourth spring increase in sequence; after the clamping block is inserted into the corresponding clamping groove, the hexagonal block in the second hexagonal groove resets.

[0013] Preferably, the screw is in threaded drive and sealing connection with the adjusting ear; rotating grooves are provided on both sides of the adjusting ear; the screw is located inside the rotating grooves; a rotating ring is rotatably and sealingly connected in the rotating grooves; an elastic sleeve is sleeved on the external thread position of the screw; one end of the elastic sleeve is fixed to the rotating ring, and the other end is connected to the outer wall of the middle section of the screw or the inner side of the side plate.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. By adjusting the distance between the two guiding seats, the initial distance between the two clamping blocks is changed, so that the safety clamp can meet the installation requirements of guide rails with different widths while maintaining a certain safety gap from the guide rail, improving the application range of the safety clamp, and the adjustment method is relatively convenient and fast.

[0016] 2. By inserting a hexagonal wrench into the second hexagonal groove, the screw is unlocked automatically, and by pulling out the second hexagonal groove, the screw is locked automatically, thus facilitating the movement adjustment of the screw driving the guiding seat and the operation of the safety clamp.

[0017] 3. During the downward movement of the driving bar, the first tooth will protrude from the first tooth groove, and during the downward movement of the first tooth, it will be stuck with a plurality of second teeth, realizing the axial locking of the adjusting ear and the sliding rod. In this way, when the upper end and the lower end of the adjusting ear are both locked, the stability of the distance adjustment between the two guiding seats is improved, and the use stability of the safety clamp is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the drawings and embodiments.

[0019] Figure 1 is a perspective view of the present invention;

[0020] Figure 2 is Figure 1 a perspective view from one of the angles;

[0021] Figure 3 is Figure 2 an enlarged view of part A in

[0022] Figure 4 is Figure 1 a perspective view from another angle;

[0023] Figure 5 is Figure 4 an enlarged view of part B in

[0024] Figure 6 is a schematic diagram of the transmission connection of the screw rod, the sliding rod and the adjusting ear in the present invention;

[0025] Figure 7 is Figure 6 an enlarged view of part C in

[0026] Figure 8 is a perspective view of the adjusting ear and the guide seat in the present invention;

[0027] Figure 9 is a cross-sectional view of the present invention;

[0028] Figure 10 is Figure 9 an enlarged view of part D in

[0029] Figure 11 is Figure 9 an enlarged view of part E in

[0030] Figure 12 is Figure 9 an enlarged view of part F in

[0031] In the figure: side plate 1, top plate 2, clamping block 21, top hole 22, first spring 23, first hexagonal groove 24, groove 25, fourth spring 26, bottom plate 3, guide seat 4, guide groove 41, adjusting ear 42, sliding hole 43, second tooth groove 44, second tooth 45, rotating groove 46, rotating ring 47, clamping block 5, bracket 6, support groove 61, support pin 62, pull rod 63, rope seat 64, adjusting bolt 65, sliding rod 7, driving groove 71, upper cavity 711, lower cavity 712, ventilation hole 713, second liquid hole 714, driving strip 72, first tooth groove 73, first tooth 74, fifth spring 75, screw rod 8, clamping groove 81, second hexagonal groove 82, hexagonal block 83, second spring 831, first limiting rope 832, anti-blocking strip 84, third spring 841, second limiting rope 842, first liquid hole 85, elastic sleeve 9. Detailed implementation manners

[0032] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0033] As Figures 1 to 12 shown, the present invention includes the following embodiments:

[0034] Embodiment 1: A progressive elevator safety gear, comprising side plates 1 and a top plate 2 and a bottom plate 3 respectively fixed to the upper and lower ends of the side plates 1; two guide seats 4 are provided inside the two side plates 1; a wedge-shaped clamping block 5 is slidably connected to one side of the two guide seats 4 close to each other through a guide groove 41; a bracket 6 with a support groove 61 is provided at the rear of the guide seat 4; the two support grooves 61 pass through a support pin 62 connected to the clamping block 5 front and rear; the upper end of the bracket 6 penetrates upward through the top plate 2 and is provided with a pull rod 63; the edges of the two guide seats 4 away from each other are provided with adjusting ears 42 at the rear; the lower ends of the two adjusting ears 42 penetrate left and right and are slidably connected to a slide rod 7; the end of the slide rod 7 is fixed to the side plate 1; the upper ends of the two adjusting ears 42 penetrate left and right and are threadedly connected to a screw rod 8 in a threaded manner; the end of the screw rod 8 is rotatably connected to the side plate 1; the threads at both ends of the screw rod 8 are arranged in opposite directions; a plurality of card slots 81 are evenly arranged on the smooth outer wall of the middle section of the screw rod 8; a card block 21 aligned with the card slots 81 is elastically slidably connected to the lower surface of the top plate 2.

[0035] In this embodiment, the upper end of the pull rod 63 passes through a corresponding top hole 22 on the top plate 2; the lower surface of the top plate 2 and the upper end of the bracket 6 are connected by a first spring 23; the first spring 23 is sleeved on the outer wall of the pull rod 63; a rope seat 64 is fixed to the upper end of the pull rod 63; an adjusting bolt 65 is threadedly connected to the outer thread of the outer wall of the pull rod 63; the adjusting bolt 65 is located in a first hexagonal groove 24 on the upper surface of the top plate 2.

[0036] When checking that the safety gear is fault-free, turn the screw 8 according to the width of the guide rail. Before turning the screw 8, move the latch 21 out of the slot 81 on the outer wall of the middle section of the screw 8 to unlock the screw 8. After unlocking, the screw 8 can rotate freely. During the rotation of the screw 8, the threads at both ends on the outer wall will rotate in opposite directions. Since the upper end of the adjusting ear 42 is in threaded transmission connection with the screw 8 and the lower end of the adjusting ear 42 slides on the slide bar 7, the rotation of the screw 8 can drive the two adjusting ears 42 to approach or move away from each other synchronously. The two guide seats 4 will move with the movement of the adjusting ears 42, so that the distance between the two guide seats 4 is adjusted to adapt to the width of the guide rail. After completing the rotation adjustment of the screw 8, release the latch 21, and the latch 21 on the top plate 2 will snap into the corresponding slot 81 under the action of elastic force to lock the rotation of the screw 8. In this way, the distance between the two adjusting ears 42 and the two guide seats 4 is locked. By adjusting the distance between the two guide seats 4, the clamping blocks 5 on the inner sides of the guide seats 4 can change with the position change of the guide seats 4, making the safety gear applicable to guide rails of different widths and having a wider application range;

[0037] After completing the adjustment of the distance between the two guide seats 4, place the two clamping blocks 5 on the inner sides of the two guide seats 4 on both sides of the guide rail, and then install the entire safety gear at the bottom of the elevator car. Then lift the rope seat 64. When the rope seat 64 is lifted, it will drive the pull rod 63 to move upward. When the pull rod 63 moves upward along the top hole 22, it will drive the bracket 6 to move upward. When the bracket 6 moves upward, it will drive the pin 62 in the pin slot 61 to move upward. When the two pins 62 move upward, they will drive the two clamping blocks 5 to slide upward along the guide groove 41, and the two clamping blocks 5 will approach each other. When the pull rod 63 moves upward, it will drive the adjusting bolt 65 out of the first hexagonal groove 24. The outer cross-section of the adjusting bolt 65 is hexagonal. After the adjusting bolt 65 moves out of the first hexagonal groove 24, the adjusting bolt 65 can rotate on the outer wall of the pull rod 63, so as to change the distance between the adjusting bolt 65 and the bracket 6. When the distance between the adjusting bolt 65 and the bracket 6 is shorter, the initial position of the clamping block 5 on the guide groove 41 is higher, making the speed at which the guide rail is clamped by the clamping block 5 faster, and further adjusting the sensitivity of the clamping block 5;

[0038] After completing the rotational adjustment of the adjusting bolt 65, loosen the tie rod 63. The first spring 23 will push the bracket 6 downward. The bracket 6 will drive the tie rod 63 downward. The tie rod 63 will drive the adjusting bolt 65 back into the first hexagonal groove 24 to lock the adjusting bolt 65, changing the initial clamping position of the clamping block 5 on the guiding groove 41, further expanding the applicable range of the safety clamp. Finally, connect the rope seat 64 with the pull rope. During the operation of the safety clamp, when the car moves downward, it will drive the safety clamp to move downward synchronously. The safety clamp will pull the pull rope through the rope seat 64, causing the flywheel (not shown in the figure) at the upper end of the pull rope (not shown in the figure) to rotate. If the downward movement speed of the car is greater than the standard value, the rotational speed of the flywheel will be greater than the standard value and jam, making the pull rope unable to move downward with the downward movement of the safety clamp. The pull rope will pull the rope seat 64 and the tie rod 63. The tie rod 63 will drive the bracket 6 to drive the two pin supports 62 upward. The pin supports 62 will drive the two clamping blocks 5 to slide along the guiding groove 41 and approach each other. After the clamping blocks 5 contact the guide rail, the safety clamp will be locked with the guide rail to brake the car. After unlocking the pull rope, the first spring 23 pushes the bracket 6 to move downward inside the safety clamp, and the two clamping blocks 5 will disengage from the contact with the guide rail, unlocking the safety clamp and the car. By adjusting the distance between the two guiding seats 4, the initial distance between the two clamping blocks 5 is changed, enabling the safety clamp to maintain a certain safety gap with the guide rail and meet the installation requirements of guide rails with different widths, improving the application range of the safety clamp, and the adjustment method is convenient and fast.

[0039] Embodiment 2: A second hexagonal groove 82 is provided at the end of the screw rod 8; a hexagonal block 83 is slidably connected in the second hexagonal groove 82; the hexagonal block 83 is connected with the bottom of the second hexagonal groove 82 through a second spring 831 and a first limiting rope 832; an anti-blocking strip 84 is slidably connected to the inner wall of the card slot 81; the anti-blocking strip 84 is connected with the bottom of the card slot 81 through a third spring 841 and a second limiting rope 842; a groove 25 corresponding to the card slot 81 is provided on the lower surface of the top plate 2; the clamping block 21 is connected with the bottom of the groove 25 through a fourth spring 26; the elastic force of the fourth spring 26 is greater than the elastic force of the third spring 841.

[0040] In this embodiment, the hexagonal block 83 is slidably and sealingly connected with the second hexagonal groove 82; the card slot 81 is slidably and sealingly connected with the anti-blocking strip 84; a liquid medium is filled in the second hexagonal groove 82; the bottom of the second hexagonal groove 82 is communicated with the bottom of the card slot 81 through a first liquid hole 85; the cross section of the clamping block 21 is adapted to the cross section of the anti-blocking strip 84.

[0041] Before the screw 8 needs to be rotated, first insert one end of a hex wrench along the notch of the second hexagonal groove 82. During the process of one end of the hex wrench entering the second hexagonal groove 82, it will squeeze the hexagonal block 83. The hexagonal block 83 will be pressed and overcome the second spring 831 to approach the bottom of the second hexagonal groove 82. The liquid medium in the second hexagonal groove 82 will be pressed and flow into the card slot 81 along the first liquid hole 85. The space in the card slot 81 will give the anti-blocking strip 84 a force away from the bottom of the card slot 81 when the liquid medium enters. The anti-blocking strip 84 that is not in contact with the clamping block 21 will be located at the notch of the card slot 81 and cannot move out further under the pulling and limiting of the second limiting rope 842. In this way, the anti-blocking strip 84 in contact with the clamping block 21 will move out under the push of the liquid medium, and the clamping block 21 will be pushed out of the corresponding card slot 81 under the push of the corresponding anti-blocking strip 84, so that the screw 8 is unlocked. The outer surfaces of multiple anti-blocking strips 84 adapt to the outer wall of the middle section of the screw 8 under the action of hydraulic pressure. In this way, when the outer wall of the middle section of the screw 8 is smooth and complete, the rotation of the screw 8 will not cause obstruction to the clamping block 21. After completing the rotation adjustment of the screw 8, remove one end of the hex wrench from the second hexagonal groove 82. Since the fourth spring 26, the third spring 841, and the second spring 831 decrease in sequence, the fourth spring 26 will push the clamping block 21 into the corresponding card slot 81, making the screw 8 rotationally locked. The anti-blocking strip 84 in contact with the clamping block 21 will overcome the third spring 841 and retract to the bottom of the card slot 81. The medium entering the card slot 81 of the clamping block 21 will flow into the second hexagonal groove 82 along the first liquid hole 85. The hexagonal block 83 will move along the groove wall of the second hexagonal groove 82 to a position flush with the end of the screw 8. The second hexagonal groove 82 will not be blocked when blocked by the hexagonal block 83 to ensure that the screw 8 is driven. The card slot 81 not inserted by the clamping block 21 is blocked by the anti-blocking strip 84 to achieve the protection and anti-blocking of the card slot 81; in this embodiment, the screw 8 is self-unlocked by inserting the hex wrench into the second hexagonal groove 82 and automatically locked when the second hexagonal groove 82 is pulled out, so as to facilitate the movement adjustment of the screw 8 driving the guide seat 4 and make the operation of the safety clamp more convenient and safe.

[0042] Embodiment 3: A drive groove 71 is provided inside the slide bar 7; a drive bar 72 is slidably connected up and down in the drive groove 71; a first tooth groove 73 is provided through the drive groove 71 downward; a first tooth 74 is slidably connected in the first tooth groove 73; the first tooth 74 is fixed to the drive bar 72; the upper surface of the drive bar 72 is connected to the upper groove wall of the drive groove 71 through a fifth spring 75; the adjustment ear 42 is slidably connected to the slide bar 7 through a slide hole 43; a second tooth groove 44 is provided at a lower position on the inner wall of the slide hole 43; a second tooth 45 is uniformly fixed in the second tooth groove 44; the second tooth 45 is engaged with the first tooth 74.

[0043] In this embodiment, the first tooth 74 is slidably and sealingly connected to the first tooth groove 73; the driving bar 72 is slidably and sealingly connected to the driving groove 71; the driving bar 72 divides the driving groove 71 into an upper cavity 711 and a lower cavity 712; the upper cavity 711 is provided with a vent hole 713 penetrating upward; the lower cavity 712 is communicated with the first liquid hole 85 through the second liquid hole 714.

[0044] During the process of inserting one end of the hexagon wrench into the second hexagonal groove 82, the hexagon wrench will squeeze the hexagonal block 83, and part of the liquid medium in the second hexagonal groove 82 will flow into the lower cavity 712 along the first liquid hole 85 and the second liquid hole 714. In this way, the driving bar 72 will be pressed and move upward along the driving groove 71. The space in the lower cavity 712 becomes larger, and the space in the upper cavity 711 becomes smaller. The gas in the upper cavity 711 will be discharged along the vent hole 713. During the upward movement of the driving bar 72, it will drive the first tooth 74 to move along the first tooth groove 73 and retract into the first tooth groove 73, making the outer wall of the slide bar 7 flat again, realizing the unlocking of the slide bar 7 and the adjusting ear 42. The clamping block 21 will also disengage from the corresponding clamping groove 81 to unlock the screw rod 8. Subsequently, controlling the rotation of the screw rod 8 realizes the adjustment of the distance between the two guide seats 4. The adjusting ear 42 will have an axial movement with the slide bar 7. Then, one end of the hexagon wrench is removed from the second hexagonal groove 82. The fifth spring 75 will push the driving bar 72 to move downward in the driving groove 71. The outside gas will enter the upper cavity 711 along the vent hole 713 for replenishment. The liquid in the lower cavity 712 will flow back along the second liquid hole 714 and the first liquid hole 85. During the downward movement of the driving bar 72, it will drive the first tooth 74 to protrude from the first tooth groove 73. During the downward movement of the first tooth 74, it will engage with multiple second teeth 45 to realize the axial locking of the adjusting ear 42 and the slide bar 7. In this way, when both the upper end and the lower end of the adjusting ear 42 are locked, the stability after adjusting the distance between the two guide seats 4 is improved, and the use stability of the safety clamp is improved; the first tooth 74 protrudes from the lower surface of the slide bar 7 and is not likely to be contaminated with impurities, ensuring the cleanliness of the first tooth 74.

[0045] Embodiment 4: Second hexagonal grooves 82 are provided at both ends of the screw rod 8; corresponding hexagonal blocks 83 are slidably and sealingly connected in the second hexagonal grooves 82 respectively.

[0046] In this embodiment, the elastic force of the second spring 831, the elastic force of the third spring 841, and the elastic force of the fourth spring 26 increase in sequence; after the clamping block 21 is inserted into the corresponding clamping groove 81, the hexagonal block 83 in the second hexagonal groove 82 resets.

[0047] Second hexagonal grooves 82 are provided at both ends of the screw rod 8, and both ends of the screw rod 8 are located on both sides of the safety clamp respectively. Therefore, installers can adjust the rotation of the screw rod 8 on either side of the safety clamp, which facilitates the installation and operation of the safety clamp. Specifically, a hexagonal wrench is inserted into the second hexagonal groove 82 on either side to move the clamping block 21 out of the clamping groove 81, unlocking the screw rod 8. Rotating the screw rod 8 adjusts the distance between the two guide seats 4. After the adjustment is completed, when the groove 25 is aligned with the clamping groove 81, the clamping block 21 will snap into the corresponding clamping groove 81. The clamping block 21 is pushed by the fourth spring 26 and snaps into the clamping groove 81, squeezing the anti-blocking strip 84 and the third spring 841. The medium in the clamping groove 81 will enter the hexagonal groove to push the hexagonal block 83 to reset. Therefore, it is possible to observe whether the hexagonal block 83 in the second hexagonal groove 82 is reset to determine whether the clamping block 21 has snapped into the clamping groove 81, further improving the convenience and accuracy of installation. Since the elastic forces of the second spring 831, the third spring 841, and the fourth spring 26 increase in sequence, when the clamping block 21 does not snap into the corresponding clamping groove 81, the hexagonal block 83 cannot be reset, prompting the installer whether the screw rod 8 is locked.

[0048] Embodiment 5: The screw rod 8 is in threaded drive sealing connection with the adjusting ear 42; rotating grooves 46 are provided on both sides of the adjusting ear 42; the screw rod 8 is located inside the rotating grooves 46; a rotating ring 47 is rotatably and sealingly connected in the rotating grooves 46; an elastic sleeve 9 is sleeved on the external thread position of the screw rod 8; one end of the elastic sleeve 9 is fixed to the rotating ring 47, and the other end is connected to the outer wall of the middle section of the screw rod 8 or the inner side of the side plate 1.

[0049] During the rotation of the screw rod 8, the screw rod 8 will drive the two adjusting ears 42 to move along the axial direction of the screw rod 8. The two sides of the adjusting ear 42 are connected to the rotating ring 47 through the rotating grooves 46, and the rotating ring 47 is rotatably and sealingly connected to the rotating grooves 46. Therefore, the setting of the elastic sleeve 9 will not affect the rotation of the screw rod 8. When the adjusting ear 42 moves along the axial direction of the screw rod 8, it will squeeze one of the elastic sleeves 9 and pull the other elastic sleeve 9. The squeezed elastic sleeve 9 will bulge, and the inner wall of the bulged elastic sleeve 9 will move away from the screw rod 8, without interfering with the movement of the adjusting ear 42. After the adjustment is completed, the elastic sleeve 9 provides dust protection for the external thread of the screw rod 8, preventing impurities such as oil sludge and floating ash from affecting the transmission of the screw rod 8 and ensuring the stable adjustment of the screw rod 8.

[0050] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the attached Figure 1The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0051] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A progressive elevator safety gear, comprising side plates, and a top plate and a bottom plate respectively fixed to the upper and lower ends of the side plates; two guide seats are provided inside the two side plates; a clamping block is slidably connected to one side of the two guide seats close to each other through a guide groove; the two clamping blocks are connected to a bracket at the rear; a pull rod is arranged upward at the upper end of the bracket; characterized in that: Adjusting ears are arranged at the edges of the two guide seats facing away from each other towards the rear; the lower ends of the two adjusting ears are slidably connected to a slide bar left and right; the end of the slide bar is fixed to the side plate; the upper ends of the two adjusting ears are threadedly driven to be connected to a screw rod left and right; the end of the screw rod is rotatably connected to the side plate; the threads at both ends of the screw rod are arranged in opposite directions; a plurality of card slots are evenly arranged on the smooth outer wall of the middle section of the screw rod; the lower surface of the top plate is elastically slidably connected to a card block aligned with the card slots; A second hexagonal groove is arranged at the end of the screw rod; a first liquid hole communicates between the bottom of the second hexagonal groove and the bottom of the card slot; a driving groove is arranged inside the slide bar; a driving bar is elastically slidably connected up and down in the driving groove; a first tooth groove runs through the driving groove downward; a first tooth engaged with the driving bar is slidably connected in the first tooth groove; the adjusting ear is slidably connected to the slide bar through a slide hole; a second tooth groove is arranged at the lower position of the inner wall of the slide hole; a second tooth engaged with the first tooth is evenly fixed in the second tooth groove; The first tooth is slidably and sealingly connected to the first tooth groove; the driving bar is slidably and sealingly connected to the driving groove; the driving bar divides the driving groove into an upper cavity and a lower cavity; a ventilation hole runs through the upper cavity upward; the lower cavity is communicated with the first liquid hole through a second liquid hole.

2. The progressive elevator safety tongs according to claim 1, characterized in that: The upper end of the pull rod passes through a corresponding top hole in the top plate; the lower surface of the top plate and the upper end of the bracket are connected by a first spring; a rope seat is fixed to the upper end of the pull rod; an adjusting bolt is threadedly connected to the external thread on the outer wall of the pull rod; the adjusting bolt is located in a first hexagonal groove on the upper surface of the top plate.

3. The progressive elevator safety tongs according to claim 1, characterized in that: A hexagonal block is elastically slidably connected in the second hexagonal groove; an anti-blocking strip is elastically slidably connected to the inner wall of the card slot; a groove corresponding to the card slot is arranged on the lower surface of the top plate; the card block is elastically slidably connected in the groove; the elastic force on the card block is greater than the elastic force on the anti-blocking strip.

4. The progressive elevator safety tongs according to claim 3, characterized in that: The hexagonal block is slidably and sealingly connected to the second hexagonal groove; the card slot is slidably and sealingly connected to the anti-blocking strip; a liquid medium is filled in the second hexagonal groove.

5. The progressive elevator safety gear according to claim 4, characterized in that: Second hexagonal grooves are arranged at both ends of the screw rod; corresponding hexagonal blocks are slidably and sealingly connected in the second hexagonal grooves respectively.

6. The progressive elevator safety tongs according to claim 4, characterized in that: After the card block is inserted into the corresponding card slot, the hexagonal block in the second hexagonal groove resets.

7. A progressive elevator safety gear according to claim 1, characterized in that: The screw rod is threadedly driven and sealingly connected to the adjusting ear; rotating grooves are arranged on both sides of the adjusting ear; the screw rod is located inside the rotating grooves; a rotating ring is rotatably and sealingly connected in the rotating grooves; an elastic sleeve is sleeved on the external thread position of the screw rod; one end of the elastic sleeve is fixed to the rotating ring, and the other end is connected to the outer wall of the middle section of the screw rod or the inner side of the side plate.

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