CN114955784B - Unidirectional safety tongs - Google Patents
Unidirectional safety tongs Download PDFInfo
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- CN114955784B CN114955784B CN202110216797.9A CN202110216797A CN114955784B CN 114955784 B CN114955784 B CN 114955784B CN 202110216797 A CN202110216797 A CN 202110216797A CN 114955784 B CN114955784 B CN 114955784B
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- wedge block
- guide rail
- elastic rod
- block
- left wedge
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- 230000009471 action Effects 0.000 claims abstract description 7
- 230000004044 response Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 8
- 238000007906 compression Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
- B66B5/22—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces by means of linearly-movable wedges
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention belongs to the technical field of safety tongs for elevators, and in particular relates to a one-way safety tongs which comprises a tongs body, wherein the tongs body is provided with a guide rail channel which is longitudinally communicated; the pliers body is provided with wedge block mounting concave parts respectively positioned at two sides of the guide rail channel, so as to be respectively used for mounting a left wedge block and a right wedge block; the left wedge block and the right wedge block are movably matched with the clamp body, the unidirectional safety clamp further comprises an elastic rod, the elastic rod longitudinally extends, the top end of the elastic rod is propped against the clamp body, and the bottom end of the elastic rod is propped against the left wedge block; when the right wedge block is lifted to the target position, the linkage left wedge block contacts and rubs with the elevator guide rail, so that the linkage elastic rod deforms to generate a component force towards the elevator guide rail for the left wedge block. Compared with the existing disc spring, the safety tongs provided by the invention have the advantages that the response is quicker under the action of external force, and the stroke is reduced, so that the safety braking is instantaneously decelerated.
Description
Technical Field
The invention belongs to the technical field of safety tongs for elevators, and particularly relates to a one-way safety tongs.
Background
When the elevator falls abnormally, a safety clamp is arranged on the elevator car to protect the safety of passengers in the elevator car as much as possible, and when the elevator car is in a normal running state, under the action of dead weight, the two wedge blocks are at the lowest part, and the clamping surfaces of the wedge blocks and the elevator guide rail keep a certain distance; when the elevator is in an abnormal state, the elevator car rapidly drops and the speed reaches the action speed set by the speed limiter, then the speed limiter acts, and the wedge blocks are lifted upwards until the clamping surfaces of the two wedge blocks are contacted with the elevator guide rail until the two wedge blocks firmly clamp the elevator guide rail, so that the elevator car stops moving, and the safety of elevator passengers in the elevator car is ensured.
For example, a safety gear structure disclosed in patent document publication No. CA 1298214C. During braking, a quick response is required for the chock to obtain stable braking performance. In the safety tongs disclosed in the above patent document, a compression spring is provided between the housing and the upper end of the wedge, the compression spring pushes the wedge obliquely downward, the compression spring is fixed in place by a fixing bolt, the fixing bolt is fixed in the wedge, but can move relative to the housing through an opening of the housing, and the diameter of the opening is larger than that of the fixing bolt; in addition, the surface of the housing on which the compression spring acts is inclined such that the spring force acting on the wedge is parallel to the guide surface of the wedge.
The compression spring as the elastic element is mostly formed by connecting a plurality of disc springs in series, so that the response of internal resistance or compression process and braking force cannot be responded quickly, and the stability of the braking process is reduced. Moreover, the disc springs after being connected in series are higher in height, so that the structural size of the safety tongs is larger, and the installation space is affected.
In addition, in the conventional safety tongs for friction braking by a wedge, since a certain braking force is obtained, the compression amount of the elastic element is controlled by limiting the vertical stroke of the wedge, and thus different positive pressures are obtained. Positive pressure delivery is set under the condition that delivery debugging meets a certain P+Q weight and guide rail structure size and state. However, as the wedges and the elevator guide rails wear during braking, the distance between the wedges increases and the positive pressure of the elastic element decreases, with the result that there is a certain risk of the braking life and reliability of the braking device. In order to solve the abrasion problem in the braking process, the limit amount needs to be adjusted through abrasion detection, and the limit after abrasion is changed along with the change to control the positive pressure of the elastic element.
Moreover, the existing wedge blocks have instability in static or low-speed braking under full load and light load. The positive pressure is relatively small during the static braking under light load, and the static braking is disabled due to the relative sliding generated during the braking of different elevator guide rails caused by the unstable friction of the wedge blocks with large area.
Disclosure of Invention
Based on the above-mentioned drawbacks and deficiencies of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a one-way safety gear which meets one or more of the above-mentioned needs.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
A unidirectional safety tongs comprises a tongs body, wherein the tongs body is provided with a guide rail channel which is longitudinally penetrated, and the guide rail channel is used for the elevator guide rail to penetrate; the pliers body is provided with wedge block mounting concave parts respectively positioned at two sides of the guide rail channel, so as to be respectively used for mounting a left wedge block and a right wedge block; the left wedge block and the right wedge block are movably matched with the clamp body, the unidirectional safety clamp further comprises an elastic rod, the elastic rod longitudinally extends, the top end of the elastic rod is propped against the clamp body, and the bottom end of the elastic rod is propped against the left wedge block; when the right wedge block is lifted to the target position, the linkage left wedge block contacts and rubs with the elevator guide rail, so that the linkage elastic rod deforms to generate a component force towards the elevator guide rail for the left wedge block.
As an optimal scheme, the top of the right wedge block is provided with a compensation block arranged on the clamp body, and the compensation block is movably matched with the clamp body to be close to or far from the elevator guide rail; when the right wedge block is lifted to the corresponding position, the right wedge block links the compensation block to contact and rub with the elevator guide rail.
Preferably, the clamp body is provided with a guide structure for guiding the compensation block to be close to or far away from the elevator guide rail.
As a preferable scheme, a sliding positioning structure is arranged between the clamp body and the right wedge block corresponding to the compensation block, so that the compensation block moves along the direction vertical to the braking surface of the elevator guide rail under the action of the right wedge block and contacts the elevator guide rail.
As an optimal scheme, the compensation block is limited by a right wedge cover plate arranged on the clamp body; the right wedge cover plate and the sliding positioning structure are respectively positioned at two sides of the compensation block.
As an optimal scheme, the sliding positioning structure comprises a chute positioned on the pliers body and a positioning piece arranged on the compensation block, wherein the positioning piece extends into the chute and is in sliding fit with the chute;
or the sliding positioning structure comprises a positioning piece arranged on the clamp body and a chute positioned on the compensation block, wherein the positioning piece extends into the chute, and the chute is in sliding fit with the positioning piece.
Preferably, the vertical distance between the top end of the elastic rod and the braking surface of the left wedge block is larger than the vertical distance between the bottom end of the elastic rod and the braking surface of the left wedge block.
Preferably, the bottom end of the elastic rod extends to a predetermined depth inside the left wedge.
Preferably, elastic rods are respectively arranged on two sides of the left wedge block.
As a preferable scheme, the top end of the elastic rod is provided with a pressure-bearing seat, and the pressure-bearing seat, the elastic rod and the left wedge block form an integrated linkage structure; the pressure-bearing seat is in surface contact fit with the clamp body.
Compared with the prior art, the invention has the beneficial effects that:
(1) When the left wedge block contacts and rubs with the elevator guide rail, the linkage elastic rod deforms, so that component force towards the elevator guide rail is generated on the left wedge block, the stability of braking force is improved, and the safety of unidirectional braking is higher; compared with the existing disc spring, the elastic rod responds faster under the action of external force, and the stroke is reduced to enable the safety brake to be instantaneously decelerated;
(2) The occupied space of the elastic rod is smaller than that of the disc spring, so that the problem that the installation space is influenced due to the fact that the structural size is large due to the fact that the height of the disc spring is increased is solved, and miniaturization of the safety protection device is facilitated; after the disc spring is replaced, the defect that the force value is unstable due to the resistance in the disc spring is overcome; and a plurality of disc springs are not required to be installed, so that the installation is more convenient;
(3) The elastic rod can extend into the left wedge block or is arranged on two sides of the left wedge block, so that space is saved, and the structural size of the unidirectional safety tongs is reduced;
(4) The pressure-bearing seat, the elastic rod and the left wedge block form an integrated linkage structure, so that the force application angle of the elastic rod is ensured;
(5) Based on the defect of braking force reduction caused by abrasion of the wedge blocks and the elevator guide rails, larger friction force is obtained by utilizing the contact friction compensation and static small contact surface of the compensation blocks and the elevator guide rails, the braking safety of the unidirectional safety tongs is improved, and effective safety protection under various working conditions is realized.
Drawings
Fig. 1 is a schematic structural view of a one-way safety gear according to embodiment 1 of the present invention (the wedge covers on both sides are omitted);
FIG. 2 is a schematic view of the structure of the left wedge block of embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the structure of an elastic rod according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a base body of the pressure-bearing base of embodiment 1 of the present invention;
fig. 5 is a schematic structural view of a limiting plate of the pressure-bearing seat according to embodiment 1 of the present invention;
FIG. 6 is a schematic structural view of an integral linkage structure composed of a pressure-bearing seat, an elastic rod and a left wedge block in embodiment 1 of the present invention;
Fig. 7 is a schematic structural view of a one-way safety gear according to embodiment 1 of the present invention;
Fig. 8 is a schematic structural view of a one-way safety gear according to embodiment 7 of the present invention (the wedge cover plates on both sides are omitted);
Fig. 9 is a schematic view of the structure of the body of the one-way safety gear according to embodiment 7 of the present invention;
FIG. 10 is a schematic view showing the mounting structure of the compensation block and the positioning pin according to embodiment 7 of the present invention;
Fig. 11 is a schematic structural view of a one-way safety gear according to embodiment 7 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Example 1:
As shown in fig. 1 to 7, the unidirectional safety tongs of the embodiment comprises a tongs body 1, a left wedge block 2-1 and a right wedge block 2-2, wherein a guide rail channel with a U-shaped cross section is longitudinally formed in the middle of the tongs body 1, and the guide rail channel penetrates through the top surface and the bottom surface of the tongs body and is used for installing an elevator guide rail; the two sides of the guide rail channel on the clamp body 1 are respectively provided with two wedge block mounting concave parts, the two wedge block mounting concave parts are parallel, the bottom of the left wedge block 2-1 mounting concave part is closer to the channel than the top of the left wedge block, and the bottom of the right wedge block 2-2 mounting concave part is farther from the channel than the top of the right wedge block. Wherein the right wedge block 2-2 is connected with a lifting mechanism so as to carry out lifting and pulling. When the right wedge block is lifted to the target position, the braking surfaces of the two wedge blocks are rubbed with the elevator guide rail to realize braking.
The unidirectional safety tongs of the embodiment further comprise an elastic rod 3, wherein the elastic rod 3 extends along the lifting direction of the wedge block (namely vertically extends), the top end of the elastic rod 3 is propped against the transition section between the mounting concave part of the left wedge block 2-1 and the top of the tongs body, and the bottom end of the elastic rod 3 is propped against the left wedge block 2-1; wherein, as shown in fig. 2, the top of the left wedge block 2-1 is provided with a deep groove 2a extending along the inside thereof, and the bottom end of the elastic rod 3 extends into the deep groove 2 a; as shown in fig. 3, the bottom end of the elastic rod 3 is provided with an anti-falling hole 3a, and the elastic rod 3 and the left wedge block 2-1 are propped against the anti-falling hole through a bolt to realize anti-falling installation, so that part of the length of the elastic rod 3 is built-in, the size of the unidirectional safety tongs can be reduced, and the elastic rod 3 and the left wedge block 2-1 are linked. In addition, the vertical distance between the top end of the elastic rod 3 and the braking surface of the left wedge block 2-1 is larger than the vertical distance between the bottom end of the elastic rod 3 and the braking surface of the left wedge block 2-1, and the change from the vertical distance between the top end of the elastic rod 3 and the braking surface of the left wedge block 2-1 to the vertical distance between the bottom end of the elastic rod 3 and the braking surface of the left wedge block 2-1 is an arc change, namely the elastic rod 3 is of an arc bent rod structure. By the design, when the left wedge block 2-1 is lifted to the target position after being contacted and rubbed with the elevator guide rail, the left wedge block 2-1 is linked with the elastic rod 3 to deform so as to generate component force towards the elevator guide rail for the left wedge block 2-1, and the stability of braking force is improved, so that the braking safety is higher.
In addition, the top end of the elastic rod 3 is provided with a pressure bearing seat 4, and the pressure bearing seat 4 is positioned below a transition section between the mounting concave part of the left wedge block 2-1 of the clamp body and the top of the clamp body; specifically, as shown in fig. 1,4 and 5, the pressure-bearing seat 4 comprises a seat body positioned at the upper side and a limiting plate 40 attached to the lower side of the seat body and fixedly installed, the seat body is provided with a limiting groove 4a, and the limiting groove 4a is matched with the structure of the spherical top end of the elastic rod 3; in addition, the lower side of the spherical top end of the elastic rod 3 is provided with a clamping groove 3b (as shown in fig. 3), the clamping position of the limiting plate 40 is matched with the clamping groove of the elastic rod in a clamping way, and the limiting plate is fixedly installed on the bearing seat body, so that the bearing seat 4 and the elastic rod 3 are linked, and the stability of braking force generated by deformation of the elastic rod is ensured. As shown in fig. 6, the pressure-bearing seat 4, the elastic rod 3 and the left wedge block 2-1 form an integral linkage structure, that is, the three move along with the movement of the left wedge block, and the pressure-bearing seat 4 and the clamp body 1 are in surface contact fit, so that on one hand, the top end of the elastic rod 3 is prevented from being displaced under the action of external force, and on the other hand, the force application angle of the elastic rod 3 is ensured.
Example 2:
the unidirectional safety tongs of this embodiment are different from embodiment 1 in that:
The change from the vertical distance between the top end of the elastic rod and the braking surface of the left wedge block to the vertical distance between the bottom end of the elastic rod and the braking surface of the left wedge block is linear change, namely, the elastic rod is of an inclined rod structure, so that component force towards the elevator guide rail can be generated on the left wedge block, structural diversification is realized, and the requirements of different application occasions are met.
Other structures can be referred to embodiment 1.
Example 3:
the unidirectional safety tongs of this embodiment are different from embodiment 1 in that:
The change in the vertical distance between the top end of the elastic rod and the braking surface of the left wedge block to the vertical distance between the bottom end of the elastic rod and the braking surface of the left wedge block is linear change + nonlinear change, for example: the upper half section of the elastic rod is a linear change section, and the lower half section is an arc section, so that component force towards the elevator guide rail can be generated on the left wedge block, structural diversification is realized, and the requirements of different application occasions are met.
Other structures can be referred to embodiment 1.
Example 4:
the unidirectional safety tongs of this embodiment are different from embodiment 1 in that:
The elastic rod can be fixedly arranged without the left wedge block, namely, the elastic rod is inserted into the deep groove of the left wedge block, so long as the elastic rod is not separated from the left wedge block or is fixed with the pressure bearing seat in the movable stroke of the left wedge block, the structure is diversified, and the requirements of different application occasions are met.
Other structures can be referred to embodiment 1.
Example 5:
the unidirectional safety tongs of this embodiment are different from embodiment 1 in that:
The installation mode and the quantity of the elastic rods are different, the elastic rods can be respectively installed on the front side and the rear side of the left wedge block, namely lugs or installation grooves are distributed and formed on the front side and the rear side of the left wedge block, the elastic rods are abutted against the corresponding lugs or are embedded into the corresponding installation grooves, component force towards the elevator guide rail can be generated on the left wedge block, structural diversification is realized, and the requirements of different application occasions are met.
Other structures can be referred to embodiment 1.
Example 6:
the unidirectional safety tongs of this embodiment are different from embodiment 1 in that:
the setting of pressure-bearing seat is omitted, can be when the clamp body shaping, directly correspond to the draw-in groove in the top design of elastic rod in the relevant position of clamp body, the top and the draw-in groove joint cooperation of elastic rod also can guarantee the stability that elastic rod warp and produce the braking force. Realizing structural diversification and meeting the requirements of different application occasions.
Other structures can be referred to embodiment 1.
Example 7:
the unidirectional safety tongs of this embodiment are different from embodiment 1 in that: on the basis of the unidirectional safety tongs of example 1, the following improvements in wedge wear compensation were made:
As shown in fig. 8, the unidirectional safety tongs of the present embodiment further includes a compensation block 5, and correspondingly, the right side of the channel of the tongs body 1 has a mounting recess of the compensation block 5, and the compensation block 5 is located at one side of the lifting direction of the right wedge block 2-2, that is, above the right wedge block 2-2; the compensation block 5 is movably fitted to the clamp body 1 to be close to or far from the elevator guide rail. When the right wedge block 2-2 is lifted to the corresponding position, the right wedge block 2-2 is linked with the compensation block 5 to contact friction with the elevator guide rail, so that self compensation of wedge block abrasion is realized.
Specifically, as shown in fig. 9, the top of the mounting recess of the compensating block 5 has a guide structure 6 for guiding the compensating block 5 toward or away from the elevator guide rail; the guide structure 6 is an inclined plane and is matched with the top surface of the compensation block 5; when the compensation block is lifted by the right wedge block in a linkage way, the compensation block moves along the direction close to the elevator guide rail until the compensation block moves to contact with the elevator guide rail for friction braking.
As shown in fig. 9-11, the clamp body 1 and the compensation block 5 are in installation fit through a sliding positioning structure, and the compensation block 5 is positioned through a wedge cover plate 7 installed on the clamp body 1; the wedge cover plate 7 and the sliding positioning structure are respectively positioned at the front side and the rear side of the compensation block 5; the sliding positioning structure comprises a chute 1a positioned on the pliers body and a positioning piece 8 arranged on the compensation block 5, wherein the positioning piece 8 extends into the chute 1a, and the positioning piece 8 is in sliding fit with the chute 1a, so that the sliding positioning structure of the embodiment can realize the positioning of the compensation block 5 and the guiding of the compensation block 5. When the right wedge block 2-2 is linked with the compensation block 5 to ascend, the compensation block 5 moves to contact friction with the elevator guide rail along the direction close to the elevator guide rail so as to realize safe braking.
Wherein, the number of the sliding grooves 1a is 2, and the sliding grooves are parallel to each other; correspondingly, the positioning pieces 8 are matched with the sliding grooves 1a in a one-to-one correspondence manner, and the positioning pieces 8 are preferably positioning pins, screws and the like. In addition, the contact surface between the top surface of the compensation block 5 and the top surface of the wedge block is an inclined surface (can also be a plane), so that the contact area is increased, and the linkage stability of the two is improved.
Example 8:
The unidirectional safety tongs of this embodiment are different from embodiment 7 in that:
The relative positions of the locating pin and the sliding groove included in the sliding locating structure are exchanged, namely, the locating pin is installed on the pliers body, the sliding groove is formed in the compensation block, and the compensation block can be located, so that the structure is diversified, and the requirements of different application occasions are met.
Other structures can be referred to embodiment 1 and embodiment 7.
Example 9:
The unidirectional safety tongs of this embodiment are different from embodiment 7 in that:
The number of the sliding grooves parallel to each other is not limited to two, one sliding groove, three sliding grooves and the like, and the sliding grooves are specifically arranged according to actual requirements, so that structural diversification is realized, and the requirements of different application occasions are met.
Other structures can be referred to embodiment 1 and embodiment 7.
Example 10:
The unidirectional safety tongs of this embodiment are different from embodiment 7 in that:
The guide structure that the compensation piece corresponds can also be curved surface and rolling element that sets up wherein to can realize the direction of compensation piece, so that the compensation piece is close to or keeps away from the elevator guide rail, specifically sets up according to actual demand, realizes the structure diversified, satisfies the demand of different application occasion.
Other structures can be referred to embodiment 1 and embodiment 7.
Example 11:
The unidirectional safety tongs of this embodiment are different from embodiment 7 in that:
The contact surface between the compensation block and the wedge block corresponding to the compensation block can be a curved surface, and accordingly, rolling bodies are arranged between the compensation block and the wedge block, and the rolling bodies are specifically arranged according to actual requirements, so that structural diversification is realized, and requirements of different application occasions are met.
Other structures can be referred to embodiment 1 and embodiment 7.
Example 12:
The unidirectional safety tongs of this embodiment are different from embodiment 7 in that:
The locating part can also be the spin, and the spout of the clamp body and the spout of compensation piece are imbedded respectively to the both sides of spin to can realize slide positioning's effect, specifically set up according to actual demand, realize the structure diversified, satisfy the demand of different application occasion.
Other structures can be referred to embodiment 1 and embodiment 7.
Example 13:
The unidirectional safety tongs of this embodiment are different from embodiment 7 in that:
The compensation surface of the compensation block can also be an arc surface or a plane or an arc surface with lines and the like, and is specifically arranged according to actual requirements, so that structural diversification is realized, and the requirements of different application occasions are met.
Other structures can be referred to embodiment 1 and embodiment 7.
The foregoing is only illustrative of the preferred embodiments and principles of the present invention, and changes in specific embodiments will occur to those skilled in the art upon consideration of the teachings provided herein, and such changes are intended to be included within the scope of the invention as defined by the claims.
Claims (5)
1. A unidirectional safety tongs comprises a tongs body, wherein the tongs body is provided with a guide rail channel which is longitudinally penetrated, and the guide rail channel is used for the elevator guide rail to penetrate; the pliers body is provided with wedge block mounting concave parts respectively positioned at two sides of the guide rail channel, so as to be respectively used for mounting a left wedge block and a right wedge block; the left wedge block and the right wedge block are movably matched with the clamp body, and the unidirectional safety clamp is characterized by further comprising an elastic rod, wherein the elastic rod longitudinally extends, the top end of the elastic rod is propped against the clamp body, and the bottom end of the elastic rod is propped against the left wedge block; when the right wedge block is lifted to a target position, the linkage left wedge block contacts and rubs with the elevator guide rail, so that the linkage elastic rod deforms to generate a component force towards the elevator guide rail for the left wedge block;
The top of the right wedge block is provided with a compensation block which is arranged on the clamp body and is movably matched with the clamp body to be close to or far away from the elevator guide rail; when the right wedge block is lifted to the corresponding position, the right wedge block is linked with the compensation block to contact and rub with the elevator guide rail;
the pliers body is provided with a guide structure for guiding the compensation block to approach or depart from the elevator guide rail;
a sliding positioning structure is arranged between the clamp body and the right wedge block corresponding to the compensation block so that the compensation block moves along the direction vertical to the braking surface of the elevator guide rail and contacts the elevator guide rail under the action of the right wedge block;
the compensation block is limited by a right wedge cover plate arranged on the clamp body; the right wedge cover plate and the sliding positioning structure are respectively positioned at two sides of the compensation block;
The sliding positioning structure comprises a chute positioned on the pliers body and a positioning piece arranged on the compensation block, wherein the positioning piece extends into the chute and is in sliding fit with the chute;
or the sliding positioning structure comprises a positioning piece arranged on the clamp body and a chute positioned on the compensation block, wherein the positioning piece extends into the chute, and the chute is in sliding fit with the positioning piece.
2. A one-way safety gear according to claim 1, wherein the vertical distance between the top end of the resilient lever and the braking surface of the left wedge is greater than the vertical distance between the bottom end thereof and the braking surface of the left wedge.
3. A one-way safety gear according to claim 1, wherein the bottom end of the resilient lever extends to a predetermined depth inside the left wedge.
4. A one-way safety gear according to claim 1, wherein the left wedge is provided with elastic bars on both sides thereof.
5. The unidirectional safety tongs of claim 1, wherein the top end of the elastic rod is provided with a pressure-bearing seat, and the pressure-bearing seat, the elastic rod and the left wedge block form an integral linkage structure; the pressure-bearing seat is in surface contact fit with the clamp body.
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| CN202110216797.9A CN114955784B (en) | 2021-02-26 | 2021-02-26 | Unidirectional safety tongs |
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| CN202110216797.9A CN114955784B (en) | 2021-02-26 | 2021-02-26 | Unidirectional safety tongs |
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| CN114955784B true CN114955784B (en) | 2024-05-07 |
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| CN2685301Y (en) * | 2004-03-17 | 2005-03-16 | 上海精润金属制品有限公司 | Elevator safety tongs |
| CN206606884U (en) * | 2016-08-20 | 2017-11-03 | 丹阳市华发环保机械有限公司 | A kind of elevator of use one-way safety pincers |
| CN207932826U (en) * | 2016-08-22 | 2018-10-02 | 泊头市恒发机械制造有限公司 | Using the elevator of unidirectional progressive safety gear |
| WO2019029314A1 (en) * | 2017-08-08 | 2019-02-14 | 无锡市一品电梯配件有限公司 | Safety gear with constant brake deceleration |
| CN212222084U (en) * | 2020-06-03 | 2020-12-25 | 苏州东方富力电梯部件有限公司 | Safety tongs for elevator |
| CN214652835U (en) * | 2021-02-26 | 2021-11-09 | 杭州沪宁电梯部件股份有限公司 | One-way safety tongs |
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| CN114955784A (en) | 2022-08-30 |
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