Electric safety tongs

Abstract

The invention provides a pair of electric safety tongs, belongs to the technical field of elevators, and solves the problem that the lifting action of the existing safety tongs can only be realized through linkage of a speed limiting rope of a speed limiter during braking when the elevator is overspeed or stalled in the lifting process. The electric safety tongs comprise a mounting plate, a plate block is detachably connected to the mounting plate, a first clamping block and a second clamping block are fixed to the plate block, a mounting block is detachably connected to the mounting plate, a mounting groove is formed in the mounting block, a first pressing block is slidably connected into the mounting groove, a cover plate is detachably connected to the mounting block, and a sliding opening is formed in the cover plate. A sliding column is fixed to the first pressing block, the sliding opening is in sliding connection with the sliding column, and an electromagnetic valve is fixed to the mounting block. The device can achieve the braking function of accidental movement protection of the elevator car, and has the advantages of improving the braking effect and safety.

Description

Technical Field

[0001] This invention belongs to the field of elevator technology and relates to an electric safety clamp, particularly an electric safety clamp. Background Technology

[0002] The safety brake is a crucial safety component of elevator equipment, playing a vital role in ensuring safety in the event of elevator overspeed or loss of control. The safety brake mechanism operates by having the speed governor activate, causing the rope clamps to grip the speed governor rope. As the car descends, the speed governor rope pulls the safety brake linkage mechanism, activating the safety brake's linkage mechanism and causing the safety brake's braking elements to contact the guide rails. This simultaneously clamps the safety brakes on both sides of the guide rails, bringing the car to a complete stop.

[0003] A search revealed that Chinese patent documents disclose an elevator safety clamp wedge [Application No.: 201811609551.2; Publication No.: CN111377336 A]. This invention discloses an elevator safety clamp wedge, which includes a wedge body and a guide rail cleaning device. The lower part of the guide rail contact surface of the wedge body is recessed, and the upper part is a braking surface. The guide rail cleaning device includes a retainer, a spring, and a toothed shoe. The retainer is fixed to the lower recess of the guide rail contact surface of the wedge body. The bottom plate of the toothed shoe is engaged under the retainer. The toothed surface of the toothed shoe protrudes upward from the retainer and is higher than the braking surface. The spring is placed between the bottom plate of the toothed shoe and the lower recess of the guide rail contact surface of the wedge body. The elevator safety clamp wedge of this invention can effectively clean the oil stains on the guide rail surface when the safety clamp is activated, so that the guide rail surface in contact with the braking surface of the wedge is cleaned, thus enhancing the stability of the safety clamp braking.

[0004] The guide rail cleaning device disclosed in this patent can effectively clean the oil stains on the guide rail surface when the safety clamp is activated, ensuring that the guide rail surface in contact with the braking surface of the wedge is cleaned, thus enhancing the stability of the safety clamp braking. However, during the emergency stop of the elevator car, the elevator car will continue to move a certain distance due to inertia. After the wedge body clamps the elevator guide rail, the distance between the wedge body and the elevator guide rail will not change. As the wedge body rubs against the elevator guide rail, it will wear down, weakening the friction between the wedge body and the elevator guide rail, affecting the braking effect, or even causing the braking effect to be lost. In addition, some existing safety clamps are relatively effective when braking downwards, but poor when braking upwards, resulting in poor safety (this description is somewhat problematic). Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an electric safety brake. The technical problem this invention aims to solve is: how to ensure the braking effect and safety of elevators during overspeed or stalling.

[0006] The objective of this invention can be achieved through the following technical solutions: An electric safety clamp includes a mounting plate with a detachable plate attached thereto. A first locking block and a second locking block are fixed to the plate. A mounting block is detachably connected to the mounting plate, and a mounting groove is formed within the mounting block. A first pressure block is slidably connected within the mounting groove. A cover plate is detachably connected to the mounting block, and a sliding opening is formed on the cover plate. A sliding column is fixed to the first pressure block, and the sliding opening is slidably connected to the sliding column. A solenoid valve is fixed to the mounting block, and a cylinder is slidably connected to the solenoid valve, and the cylinder is slidably connected to the first pressure block.

[0007] The working principle of this invention is as follows: An mounting plate is installed on the top or bottom of the elevator car, and the elevator slide rail is locked between locking block one and locking block two, limiting the elevator car and preventing accidental movement. In the event of overspeed ascent or descent, an emergency stop is activated. A solenoid valve controls a cylinder to press down on locking block one, which in turn presses against the elevator slide rail to stop it. When locking block one slides against the elevator slide rail due to inertia, friction causes it to experience an upward or downward force, causing it to move upward or downward within the slide opening. This upward or downward movement brings locking block one closer to the elevator slide rail, further pressing it against the rail and improving the braking effect. This reduces the travel distance due to inertia, thus reducing wear on locking block one and improving safety.

[0008] Multiple fixing posts are fixed between the first and second card blocks, and multiple pulleys are rotatably connected to the fixing posts.

[0009] By adopting the above structure and installing pulleys, the elevator car can slide more smoothly on the slide rails, reducing resistance.

[0010] The pressure block has a T-shaped slider inside, and the cylinder is fixedly connected to the slider.

[0011] By adopting the above structure, and by opening a limit groove and installing a slider, it is possible to ensure that when the pressure block moves up and down under the inertia of the elevator car, the cylinder on the solenoid valve that controls the rightward movement of the pressure block remains stationary and does not affect the up and down movement of the pressure block.

[0012] The slider has a square groove, and a stop block is fixed at the other end of the cylinder. The stop block is slidably connected to the square groove.

[0013] By adopting the above structure, and by opening a square groove and installing a stop block, the cylinder on the solenoid valve will slide in the square groove of the slider during the up and down movement of the pressure block one, so as not to restrict the movement of the pressure block one, and the stop block can prevent the cylinder from detaching from the pressure block one.

[0014] The mounting plate, plate, mounting block, and cover plate are all provided with threaded holes. The plate and mounting block are connected to the mounting plate by bolts, and the cover plate and mounting block are connected by bolts.

[0015] The above structure, with the use of mounting bolts, allows for easy disassembly of the mounting blocks, plates, and cover plates, resulting in a more secure installation.

[0016] The sliding groove includes a semi-circular arc groove and a horizontal groove, and the horizontal groove is connected to the middle of the semi-circular arc groove.

[0017] By adopting the above structure, the movement range of the pressure block one within the mounting groove is limited by connecting the horizontal sliding opening with the middle of the semi-circular sliding opening.

[0018] The mounting groove has an opening at the right end, and a pressure block two is fixed inside the opening.

[0019] With the above structure, by installing the second pressure block, the elevator slide rail is positioned between the first and second pressure blocks. Under the control of the solenoid valve, the first pressure block moves towards the second pressure block, thereby reducing the distance between the first and second pressure blocks and squeezing and stopping the elevator slide rail.

[0020] The surfaces of the first and second pressure blocks are each connected to friction plates by bolts, and the friction plates are provided with anti-limiting grooves.

[0021] By adopting the above structure and installing friction plates, the friction between the first and second pressure blocks on the elevator slide rail is increased, preventing the elevator car from continuing to slide during the braking process.

[0022] A connecting plate is fixed on the mounting plate, and the connecting plate has multiple circular openings.

[0023] By adopting the above structure and installing a connecting plate, the mounting plate can be detachably fixed to the top or bottom of the elevator car.

[0024] A right-angled triangular support plate is fixed between the mounting plate and the connecting plate.

[0025] By adopting the above structure and installing a triangular support plate, a stable connection between the mounting plate and the connecting plate is achieved.

[0026] Compared with existing technologies, this electric safety clamp has the following advantages: 1. Install the mounting plate on the top or bottom of the elevator car, locking the elevator slide rail between locking block one and locking block two to limit the elevator car's movement and prevent accidental movement. In the event of overspeed ascent or descent, an emergency stop will be activated. The solenoid valve controls the cylinder to press down on pressure block one, which in turn presses down on the elevator slide rail to stop it. (The instructions repeat the process.) The system will initiate an emergency stop. The solenoid valve controls the cylinder to press the pressure block downwards. The pressure block then presses against the elevator rail to stop it. When the pressure block slides against the elevator rail due to inertia, it experiences an upward or downward force due to friction. This causes the pressure block to move upwards or downwards within the sliding opening. As the pressure block moves upwards or downwards, it moves closer to the elevator rail, thus pressing it firmly against the rail. This further enhances the braking effect on the elevator, reduces the travel distance of the elevator due to inertia, reduces wear on the pressure block, and improves safety.

[0027] 2. By opening a limit groove and installing a slider, when the pressure block moves left and right under the inertia of the elevator car, the cylinder on the solenoid valve that controls the rightward movement of the pressure block remains stationary and does not affect the up-and-down movement of the pressure block.

[0028] 3. By opening a square groove and installing a stop block, the cylinder on the solenoid valve slides in the square groove of the slider during the up and down movement of the pressure block one, thus not restricting the movement of the pressure block one. The stop block can prevent the cylinder from detaching from the pressure block one. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 This is a cross-sectional view of the mounting block in this invention.

[0031] Figure 3 This is a schematic diagram of the rear structure of the present invention.

[0032] Figure 4 This is a schematic diagram of the pulley structure in this invention.

[0033] Figure 5 This is a cross-sectional view of the limiting groove in this invention.

[0034] Figure 6 This is a schematic diagram of the mounting plate in this invention.

[0035] Figure 7 This is a schematic diagram of the mounting block in this invention.

[0036] Figure 8 This is a schematic diagram of the cover plate in this invention.

[0037] In the diagram, 1. Mounting plate; 2. Plate; 3. Locking block one; 4. Locking block two; 5. Mounting block; 6. Mounting groove; 7. Pressing block one; 8. Solenoid valve; 9. Fixing column; 10. Pulley; 11. Slider; 12. Cylinder; 13. Sliding port; 14. Sliding column; 15. Cover plate; 16. Groove; 17. Pressing block two; 18. Friction plate; 19. Connecting plate; 20. Round opening; 21. Support plate; 22. Limiting groove; 23. Square groove; 24. Stop block. Detailed Implementation

[0038] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0039] like Figures 1-8 As shown, this electric safety clamp includes a mounting plate 1, a plate 2 detachably connected to the mounting plate 1, a locking block 3 and a locking block 4 fixed on the plate 2, a mounting block 5 detachably connected to the mounting plate 1, a mounting groove 6 formed in the mounting block 5, a pressure block 7 slidably connected in the mounting groove 6, a cover plate 15 detachably connected to the mounting block 5, a sliding opening 13 formed on the cover plate 15, a sliding column 14 fixed on the pressure block 7, the sliding opening 13 and the sliding column 14 slidably connected, a solenoid valve 8 fixed on the mounting block 5, a cylinder 12 slidably connected to the solenoid valve 8, and the cylinder 12 slidably connected to the pressure block 7.

[0040] The working principle of this invention is as follows: Mounting plate 1 is installed on the top or bottom of the elevator car, and the elevator slide rail is locked between locking block 3 and locking block 4, limiting the elevator car and preventing accidental movement. In the event of overspeed ascent or descent, an emergency stop is initiated. Electromagnetic valve 8 controls cylinder 12 to press down on pressure block 7, which in turn presses down on the elevator slide rail to stop it. When pressure block 7 slides against the elevator slide rail due to inertia, under the action of friction, pressure block 7 experiences an upward or downward force, causing it to move upward or downward within the sliding opening 13. As pressure block 7 moves upward or downward within the sliding opening 13, it moves closer to the elevator slide rail, thus pressing it firmly. This further enhances the braking effect on the elevator, reduces the travel distance due to inertia, reduces wear on pressure block 7, and improves safety.

[0041] Multiple fixing posts 9 are fixed between the first fixing block 3 and the second fixing block 4, and multiple pulleys 10 are rotatably connected to the fixing posts 9.

[0042] By adopting the above structure and installing pulley 10, the elevator car slides more smoothly on the slide rail, reducing resistance.

[0043] The pressure block 7 has a T-shaped slider 11 inside, and the cylinder 12 is fixedly connected to the slider 11.

[0044] By adopting the above structure, and by opening the limiting groove 22 and installing the slider 11, when the pressure block 7 moves up and down under the action of the elevator car inertia, the cylinder 12 on the solenoid valve 8 that controls the rightward movement of the pressure block 7 remains stationary and does not affect the up and down movement of the pressure block 7.

[0045] The slider 11 has a square groove 23, and the other end of the cylinder 12 is fixed with a stop 24, which is slidably connected to the square groove 23.

[0046] By adopting the above structure, by opening the square groove 23 and installing the stop block 24, the cylinder 12 on the solenoid valve 8 will slide in the square groove 23 of the slider 11 during the up and down movement of the pressure block 7, so as not to restrict the movement of the pressure block 7. The stop block 24 can prevent the cylinder 12 from falling off the pressure block 7.

[0047] The mounting plate 1, plate 2, mounting block 5 and cover plate 15 are all provided with threaded holes. The plate 2 and the mounting block 5 are both connected to the mounting plate 1 by bolts, and the cover plate 15 and the mounting block 5 are connected by bolts.

[0048] With the above structure, the mounting block 5, plate 2 and cover plate 15 can be easily disassembled and installed more securely by using mounting bolts.

[0049] The slide 13 includes a semi-circular arc slide groove and a horizontal slide groove, and the horizontal slide groove is connected to the middle of the semi-circular arc slide groove.

[0050] By adopting the above structure, the horizontal sliding opening 13 is connected to the middle of the semi-circular sliding opening 13, thus limiting the range of movement of the pressure block 7 within the mounting groove 6.

[0051] The mounting groove 6 has a slot 16 at its right end, and a pressure block 17 is fixed inside the slot 16.

[0052] Using the above structure, by installing pressure block 2 17, the elevator slide rail is between pressure block 1 7 and pressure block 2 17, so that pressure block 1 7 moves towards pressure block 2 17 under the control of solenoid valve 8, thereby reducing the distance between pressure block 1 7 and pressure block 2 17 and squeezing and stopping the elevator slide rail.

[0053] The surfaces of the first pressure block 7 and the second pressure block 17 are connected to friction plates 18 by bolts, and the friction plates 18 are provided with anti-limiting grooves 22.

[0054] By adopting the above structure and installing friction plates 18, the friction between pressure block 1 7 and pressure block 2 17 on the elevator slide rail is increased, preventing the elevator car from continuing to slide during the braking process.

[0055] A connecting plate 19 is fixed on the mounting plate 1, and the connecting plate 19 has multiple circular openings 20.

[0056] With the above structure, the mounting plate 1 can be detachably fixed to the top or bottom of the elevator car by installing the connecting plate 19.

[0057] A right-angled triangular support plate 21 is fixed between the mounting plate 1 and the connecting plate 19.

[0058] By adopting the above structure and installing the triangular support plate 21, a stable connection relationship is achieved between the mounting plate 1 and the connecting plate 19.

[0059] The working principle of this invention is as follows: The connecting block 19 on the mounting plate 1 is detachably installed on the top or bottom of the elevator car, and the elevator slide rail is locked between the locking block 3 and the locking block 4 to limit the elevator car and prevent it from moving unexpectedly. In the event of overspeed ascent or descent of the elevator, an emergency stop will be initiated. The solenoid valve 8 controls the cylinder 12 to press the pressure block 7 to the right. The pressure block 7 presses the elevator slide rail to stop. During the emergency stop of the elevator car, the elevator car will move up and down under the action of inertia. The sliding column 14 of the pressure block 7 moves in the sliding port 13 with the second direction of elevator car movement, making the pressure block 7 press tighter.

[0060] In summary, the braking effect and safety are improved by using sliding joints and sliding columns.

[0061] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An electrically operated safety clamp comprising a mounting plate (1), characterised in that, The mounting plate (1) is detachably connected with a plate (2), the plate (2) is fixed with a clamping block one (3) and a clamping block two (4), the mounting plate (1) is detachably connected with a mounting block (5), the mounting block (5) is internally provided with a mounting slot (6), the mounting slot (6) is slidably connected with a pressing block one (7), the mounting block (5) is detachably connected with a cover plate (15), the cover plate (15) is internally provided with a sliding opening (13), the pressing block one (7) is fixedly connected with a sliding column (14), the sliding opening (13) is slidably connected with the sliding column (14), the mounting block (5) is fixedly connected with a solenoid valve (8), the solenoid valve (8) is slidably connected with a cylinder (12), and the cylinder (12) is slidably connected with the pressing block one (7).

2. An electrically powered safety clamp according to claim 1, wherein A plurality of fixed columns (9) are fixed between the clamping block one (3) and the clamping block two (4), and a plurality of pulleys (10) are rotatably connected with the fixed columns (9).

3. The electrically powered safety clamp of claim 1, wherein, The pressing block one (7) is internally provided with a "T"-shaped limiting slot (22), and a sliding block (11) is slidably connected in the limiting slot (22).

4. The electrically powered safety clamp of claim 1, wherein, The sliding block (11) is internally provided with a square slot (23), and a stop block (24) is fixedly connected with the other end of the cylinder (12), and the stop block (24) is slidably connected with the square slot (23).

5. An electrically powered safety clamp according to claim 4, wherein Threaded holes are formed in the mounting plate (1), the plate (2), the mounting block (5) and the cover plate (15), the plate (2) and the mounting block (5) are connected with the mounting plate (1) through bolts, and the cover plate (15) and the mounting block (5) are connected through bolts.

6. An electrically powered safety clamp according to claim 5, wherein, The sliding opening (13) comprises a semicircular sliding groove and a horizontal sliding groove, and the horizontal sliding groove is connected with the middle of the semicircular sliding groove.

7. The electrically powered safety clamp of claim 1, wherein, A slot (16) is formed in the right end of the mounting slot (6), and a pressing block two (17) is fixed in the slot (16).

8. The electrically powered safety clamp of claim 1, wherein, Friction plates (18) are connected with the opposite surfaces of the pressing block one (7) and the pressing block two (17) through bolts, and anti-limiting grooves are formed in the friction plates (18).

9. The electrically powered safety clamp of claim 1, wherein, A connecting plate (19) is fixed on the mounting plate (1), and a plurality of round openings (20) are formed in the connecting plate (19).

10. An electrically powered safety clamp according to claim 9, wherein, A right-angled triangular supporting plate (21) is fixed between the mounting plate (1) and the connecting plate (19).

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