Electronic safety tongs

Abstract

The utility model belongs to the technical field of elevator accessories, and particularly relates to an electronic safety gear which comprises a gear body, a brake pin roller and a friction block, and the gear body is provided with a guide rail channel extending vertically and a roller path and an embedding groove which are distributed on the two sides of the guide rail channel; the brake pin roller is arranged on the caliper body through the pin roller cover plate and is movably matched with the roller path; the friction block is mounted in the embedding groove of the caliper body through the limiting cover plate; the electronic safety tongs further comprise an electronic trigger piece installed on the tongs body, and are characterized in that the roller cover plate is provided with a roller movable avoiding strip-shaped hole and a cover plate transverse movable stroke hole, and the convex shaft of the brake roller is inserted into the roller movable avoiding strip-shaped hole; the pin roller cover plate penetrates through the cover plate transverse movement stroke hole through a fixing piece to be fixed to the clamp body so that the pin roller cover plate can be movably installed on the clamp body in a matched mode. In the power-off state, the electronic triggering piece drives the roller cover plate to move transversely to be close to the guide rail channel, and the roller cover plate synchronously links the braking roller to move transversely to be in contact with the elevator guide rail. The electronic safety tongs are better in safety and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of elevator parts technology, specifically relating to an electronic safety clamp. Background Technology

[0002] Electronic safety clamps use electronic triggering, resulting in a short response time and effectively improving elevator safety. However, existing instantaneous electronic safety clamps have a relatively large reset force, making on-site reset relatively difficult. To improve the triggering reliability and reliable reset after braking, the braking drive and reset structure of electronic safety clamps need further improvement. Utility Model Content

[0003] Based on the aforementioned shortcomings and deficiencies in the prior art, one of the objectives of this utility model is to at least solve one or more of the aforementioned problems in the prior art. In other words, one of the objectives of this utility model is to provide an electronic safety clamp that meets one or more of the aforementioned requirements.

[0004] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0005] An electronic safety clamp includes a clamp body, a brake roller, and a friction block. The clamp body has a vertically extending guide channel and raceways and mounting slots distributed on both sides. The brake roller is mounted on the clamp body through a roller cover plate and movably engages with the raceway. The friction block is mounted in the mounting slot of the clamp body through a limiting cover plate. The electronic safety clamp also includes an electronic trigger installed on the clamp body. The roller cover plate has a roller movement clearance slot and a cover plate lateral movement stroke hole. The convex shaft of the brake roller is inserted into the roller movement clearance slot. The roller cover plate is fixed to the clamp body through a fixing member passing through the cover plate lateral movement stroke hole, so that the roller cover plate is movably engaged with the clamp body.

[0006] In the event of a power failure, the electronic trigger drives the roller cover to move laterally to approach the guide rail channel, and the roller cover synchronously brakes the roller to move laterally until it contacts the elevator guide rail.

[0007] As a preferred embodiment, the roller movable avoidance strip hole includes a vertical section and a movable avoidance section. The vertical section is used to prevent the brake roller from malfunctioning, and the movable avoidance section is used to avoid the stroke of the brake roller friction braking with the elevator guide rail.

[0008] As a preferred embodiment, the raceway has an inclined surface structure.

[0009] As a preferred embodiment, the friction block is a wedge structure, and the bottom of the groove of the clamp body is an inclined structure, with the inclined surface of the friction block fitting against the bottom of the groove.

[0010] As a preferred embodiment, the cover plate has at least two transverse travel holes, which are staggered.

[0011] As a preferred embodiment, the lateral movement hole of the cover plate is an oblong hole.

[0012] As a preferred embodiment, the roller cover plate is bent and extended to have a drive seat, and the drive end of the electronic trigger is drivenly connected to the drive seat of the roller cover plate for vertically driving the roller cover plate.

[0013] The drive unit has a lateral travel hole to allow for relative lateral movement between the roller cover and the drive end of the electronic trigger.

[0014] As a preferred embodiment, the roller cover is equipped with an electrical switch. Before the roller cover moves laterally in sync with the brake roller to contact the elevator guide rail, the electrical switch disengages from the clamp body to disconnect the electrical switch.

[0015] As a preferred embodiment, the two ends of the friction block along the guide rail channel are respectively abutted against the clamp body and the displacement reset mechanism. The displacement reset mechanism is used to provide the friction block with displacement stroke and reset the friction block after displacement when the safety clamp is reset.

[0016] The displacement reset mechanism includes a guide post and a compression spring. One end of the guide post has a boss that abuts against the friction block, and the other end passes through the clamp body. The compression spring is sleeved outside the guide post, and its two ends abut against the boss and the clamp body, respectively.

[0017] The guide post is linked to the friction block to move along the extension direction of the guide rail channel;

[0018] The limiting cover plate has a movable clearance groove corresponding to the friction block, and the friction block has a guide protrusion. The guide protrusion is inserted into the movable clearance groove to avoid lateral and vertical movement of the friction block.

[0019] As a preferred embodiment, the electronic trigger is an electromagnet.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] (1) The electronic safety clamp of this utility model uses an electronic trigger to drive the roller cover plate to move laterally to approach the guide rail channel. The roller cover plate synchronously links to brake the roller to move laterally until it contacts the elevator guide rail, thus achieving braking. This makes the safety and reliability better.

[0022] (2) The roller movable avoidance strip hole of this utility model has a vertical section, which can prevent the brake roller from malfunctioning and avoid the safety clamp from malfunctioning.

[0023] (3) The present invention is provided with a friction block, the inclined surface of which fits with the inclined surface structure of the bottom of the groove, which can reduce the reset force of the safety clamp.

[0024] (4) The electrical switch of this utility model is installed on the roller cover plate. When the electromagnet is de-energized, the roller cover plate moves upward, causing the brake roller to contact the elevator guide rail and move upward to brake, while simultaneously disconnecting the electrical switch. When the reset is completed, the electrical switch is turned on. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the electronic safety clamp according to Embodiment 1 of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the electronic safety clamp according to Embodiment 1 of this utility model (the roller cover plate and the limiting cover plate are omitted);

[0027] Figure 3 This is a schematic diagram of the clamp body of Embodiment 1 of this utility model;

[0028] Figure 4 This is a structural schematic diagram of the clamp body from another perspective of Embodiment 1 of this utility model;

[0029] Figure 5 This is a structural schematic diagram of the clamp body from another perspective of Embodiment 1 of this utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the roller cover plate of Embodiment 1 of this utility model;

[0031] Figure 7 This is a structural schematic diagram of the roller cover plate of Embodiment 1 of this utility model from another perspective. Detailed Implementation

[0032] To more clearly illustrate the embodiments of this utility model, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0033] Example 1:

[0034] like Figures 1 to 7 As shown, the electronic safety clamp of this embodiment includes a clamp body 1, a brake roller 2, a roller cover plate 3, a friction block 4, a limit cover plate 5, an electromagnet 6, and a displacement reset mechanism.

[0035] In this embodiment, the clamp body 1 has a vertically extending guide rail channel 10. The clamp body 1 forms a first recess I and a second recess II on the right and left sides of the guide rail channel 10. The first recess I is used to install the brake roller 2. The bottom of the first recess I is the raceway G of the brake roller 2. The raceway G has an inclined structure. The distance between the top of the raceway G and the guide rail channel 10 is smaller than the distance between the bottom of the raceway G and the guide rail channel 10. The second recess II forms the mounting groove of the friction block 4 and is used to install the friction block 4, so that the brake roller 2 and the friction block 4 are located on the left and right sides of the guide rail channel 10, respectively, so as to cooperate with the elevator guide rail braking.

[0036] Specifically, the first recess I of the clamp body 1 has a front opening corresponding to the mounting roller cover plate 3 of the brake roller 2. The brake roller 2 is movably fitted into the raceway G, and the rear side of the brake roller 2 is attached to the inner wall of the clamp body 1, achieving guidance through the inner wall of the clamp body 1. The large guiding area results in good rolling stability of the brake roller 2. The roller cover plate 3 has a roller movement clearance slot 31 and a cover plate transverse movement stroke hole 32. The convex shaft on the front side of the brake roller 2 is inserted into the roller movement clearance slot 31 to achieve a guiding fit. The circumferential surface of the brake roller 2 can be knurled, grooved, or otherwise designed to increase friction to improve self-locking reliability. The brake roller 2 is movably fitted into the raceway G to engage or disengage with the elevator guide rail.

[0037] In this embodiment, the roller cover plate 3 is fixed to the clamp body 1 by fixing bolts 7 passing through the lateral movement hole 32 of the cover plate, so that the roller cover plate 3 can be movably installed in the clamp body 1. The lateral movement hole 32 of the cover plate is an oblong hole inclined to the guide rail channel 10 to allow for vertical and lateral movement of the roller cover plate 3. Furthermore, there are two lateral movement holes 32 of the cover plate, which are staggered to improve structural stability.

[0038] In this embodiment, the roller movable avoidance strip hole 31 includes a vertical section 31a and a movable avoidance section 31b. The vertical section 31a is used to prevent the brake roller 2 from malfunctioning, and the movable avoidance section 31b is used to avoid the friction braking stroke between the brake roller 2 and the elevator guide rail. Specifically, from bottom to top, the distance between the movable avoidance section 31b and the guide rail channel becomes smaller and smaller, so that the brake roller 2 can brake with the elevator guide rail.

[0039] In this embodiment, the friction block 4, at both ends along the guide rail channel direction, i.e., the upper and lower ends of the friction block, respectively abuts against the top wall of the second recess II of the clamp body and the bottom wall of the second recess II of the clamp body, forming a displacement reset mechanism. The friction block 4 has a wedge structure, and the bottom of the corresponding friction block's mounting groove is a slope structure X. The slope of the friction block fits against the bottom of the mounting groove, and the wedge's slope reduces the reset force of the safety clamp.

[0040] In this embodiment, the front opening of the second recess II of the clamp body 1 corresponds to the installation limiting cover plate 5 of the friction block 4. The limiting cover plate 5 has a guide limiting groove 50, and the friction block 4 has a guide pin 40 that guides and cooperates with the guide limiting groove 50 to guide the friction block 4 to move vertically and limit its movement to move laterally.

[0041] The displacement reset mechanism of this embodiment is designed to reduce the reset force of the safety clamp and to reset the displacement of the friction block along the guide rail channel after the safety clamp has reset. Specifically, the displacement reset mechanism includes a guide post 8 and a compression spring 9. The upper end of the guide post 8 has a coaxial boss 80, the diameter of which is larger than the diameter of the guide post 8. This increases the contact area with the friction block 4 and facilitates the installation of the compression spring 9. The friction block 4 abuts against the top of the boss 80. The lower end of the guide post 8 penetrates the bottom wall of the second recess of the clamp body and the horizontal bend of the limiting cover plate 5. The compression spring 9 is sleeved outside the guide post 8, and its upper and lower ends abut against the boss 80 and the bend of the limiting cover plate 5 or the bottom wall of the second recess of the clamp body, respectively. The guide post 8 is linked to the friction block 4 and moves along the extension direction of the guide rail channel, that is, the guide post 8 is movably coupled to the clamp body 1.

[0042] In this embodiment, the electromagnet 6 is mounted below the roller cover plate 3 via a mounting bracket 60 fixed to the clamp body 1. When power is lost, it drives the roller cover plate 3 to move laterally closer to the guide rail channel 10. Simultaneously, the roller cover plate 3 engages with the brake roller 2, which moves laterally until it contacts the elevator guide rail. The elevator guide rail then drives the brake roller 2 along the roller movement avoidance slot 31 to the top of the avoidance section 31b, ultimately achieving braking engagement between the brake roller 2 and the elevator guide rail. Specifically, the roller cover plate 3 has a bent extension with a drive seat 33. The drive end of the electromagnet 6 is drivenly connected to the drive seat 33 of the roller cover plate, used to vertically drive the roller cover plate 3. The drive seat 33 has a lateral travel hole 330 to avoid relative lateral movement between the roller cover plate 3 and the drive end of the electromagnet 6.

[0043] In addition, an electrical switch 11 is installed on the top of the roller cover plate 3 in this embodiment. Before the roller cover plate 3 synchronously brakes the roller 2 to move laterally and contact the elevator guide rail, the electrical switch 11 is disengaged from the top of the clamp body 1 to disconnect the electrical switch 11.

[0044] The braking principle of the electronic safety clamp in this embodiment is as follows:

[0045] When the electromagnet is de-energized, its driving end pops out, vertically driving the roller cover plate to move vertically and simultaneously laterally to approach the guide rail channel. The roller cover plate simultaneously brakes the roller to move laterally until it contacts the elevator guide rail, and simultaneously disconnects the electrical switch, ultimately causing both the brake roller and the friction block to contact the elevator guide rail for braking. During the reset process, only a small reset force is needed to move the friction block of the wedge structure downward, reducing the normal pressure of the friction block on the elevator guide rail. After moving, the friction block returns to its original position under the reset action of the displacement reset mechanism.

[0046] Example 2:

[0047] The difference between the power failure-triggered safety clamp in this embodiment and embodiment 1 is as follows:

[0048] Electromagnets can also be installed on the side of the roller cover plate to directly drive the roller cover plate to move laterally, thus meeting the needs of different applications.

[0049] Other structures can be found in Example 1.

[0050] The above description is only a detailed explanation of the preferred embodiments and principles of this utility model. For those skilled in the art, there may be changes in the specific implementation methods based on the ideas provided by this utility model, and these changes should also be considered within the protection scope of this utility model.

Claims

1. An electronic safety clamp, comprising a clamp body, a brake roller and a friction block, the clamp body having a vertically extending guide rail channel and its two sides distributed with a raceway and an embedding slot; the brake roller is installed on the clamp body through a roller cover plate and movably fitted in the raceway; the friction block is installed in the embedding slot of the clamp body through a limiting cover plate; the electronic safety clamp further comprises an electronic trigger installed on the clamp body, characterized in that, The roller cover plate has a roller movable avoiding strip hole and a cover plate transverse movable stroke hole, the convex shaft of the brake roller is inserted into the roller movable avoiding strip hole; the roller cover plate is fixed to the tongs body through the fixed part penetrating the cover plate transverse movable stroke hole, so that the roller cover plate is movably installed on the tongs body. In the power-off state, the electronic trigger drives the roller cover plate to move transversely to approach the guide rail channel, and the roller cover plate synchronously links the brake roller to move transversely to contact the elevator guide rail.

2. An electronic safety clutch according to claim 1, wherein The roller movable avoiding strip hole includes a vertical section and a movable avoiding section, the vertical section is used to prevent the brake roller from malfunctioning, and the movable avoiding section is used to avoid the stroke of the friction between the brake roller and the elevator guide rail.

3. An electronic safety clutch according to claim 1, wherein The raceway is a slope structure.

4. The electronic safety clutch of claim 1, wherein, The friction block is a wedge block structure, the groove bottom of the embedding groove of the tongs body is a slope structure, and the slope of the friction block is matched with the groove bottom of the embedding groove.

5. The electronic safety clutch of claim 1, wherein, The cover plate transverse movable stroke hole is at least two and is distributed in a staggered manner.

6. The electronic safety clutch of claim 1, wherein, The cover plate transverse movable stroke hole is a waist-shaped hole.

7. The electronic safety clutch of claim 1, wherein, The roller cover plate is bent and extended with a driving seat, the driving end of the electronic trigger is drivingly connected with the driving seat of the roller cover plate, and is used to vertically drive the roller cover plate. The driving seat has a transverse stroke hole, which is used to avoid the relative transverse movement of the roller cover plate and the driving end of the electronic trigger.

8. The electronic safety clutch of claim 1, wherein, The roller cover plate is provided with an electrical switch, and before the roller cover plate synchronously links the brake roller to move transversely to contact the elevator guide rail, the electrical switch is separated from the tongs body to disconnect the electrical switch.

9. The electronic safety clutch of claim 1, wherein, The two ends of the friction block in the direction of the guide rail channel abut against the tongs body and the displacement reset mechanism respectively, and the displacement reset mechanism is used to provide displacement stroke for the friction block when the safety tongs is reset and reset the friction block after displacement; The displacement reset mechanism includes a guide column and a compression spring, one end of the guide column has a boss abutting against the friction block, and the other end penetrates the tongs body; the compression spring is sleeved outside the guide column, and the two ends thereof abut against the boss and the tongs body respectively; The guide column is movably connected with the friction block in the extension direction of the guide rail channel. The limiting cover plate has a movable avoiding groove corresponding to the friction block, the friction block has a guide convex column, and the guide convex column is inserted and matched with the movable avoiding groove to avoid the transverse movement and vertical movement of the friction block.

10. The electronic safety clutch according to any of claims 1-9, characterized in that, The electronic trigger is an electromagnet.

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