CN107443283B - A spanner that declutches for checking drum brake spring - Google Patents
A spanner that declutches for checking drum brake spring Download PDFInfo
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- CN107443283B CN107443283B CN201710910710.1A CN201710910710A CN107443283B CN 107443283 B CN107443283 B CN 107443283B CN 201710910710 A CN201710910710 A CN 201710910710A CN 107443283 B CN107443283 B CN 107443283B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/48—Spanners; Wrenches for special purposes
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Abstract
The invention provides a brake release wrench for checking a drum brake spring, which comprises a distance adjusting component, a pressure sensor, a pair of tong heads, a pair of wrench handles and a distance adjusting component, wherein the pair of tong heads are movably hinged through tong head pin shafts, the tops of the pair of tong heads are connected with a pressing part, one side perpendicular to the top surfaces of the pair of pressing parts is internally provided with a circular inner cavity, the side surface of the circular inner cavity is provided with an opening, the surface of the inner cavity is provided with an internal thread, the distance adjusting component consists of a sleeve-in-sleeve screw rod with an internal thread hole and an adjusting head with adjustable protrusion height, and the sleeve-in-sleeve screw rod and the pressure sensor are arranged in the circular inner cavity; the distance subassembly comprises chi and the fastener that is equipped with the bar groove, and a pair of trigger afterbody respectively is equipped with the through-hole, and the chi passes through the fastener to be installed in the trigger afterbody, through the elasticity of adjusting the fastener for the interval of fixed trigger afterbody.
Description
Technical Field
The present invention relates to elevator inspection tools, and more particularly, to a brake release wrench for calibrating drum brake springs.
Background
The brake is an important safety part of the elevator, and once the brake fails, the brake can cause severe consequences such as the squat of the elevator car, the top rushing and the door opening operation so as to cause personnel to be sheared and injured. Therefore, the brake system of the elevator should have an electromechanical friction type brake, which has both parking brake and service brake functions, in addition to the electric brake.
The main types of elevator brakes are drum and disc type, drum brakes, which due to their simple construction and low cost are commonly used in asynchronous motor hoisters and in a considerable part of synchronous motor hoisters, including most freight elevators and a considerable number of passenger elevators. Of these drum brakes, most designs are equipped with only one set of manual brake release devices, except that a few synchronous machines use block-type drum brakes installed separately on both sides, and fig. 1 shows the most common type of elevator drum brake.
In FIG. 1, the designations illustrate: 1-brake hub, 2-brake shoe seat, 3-brake shoe, 4-brake arm, 5-graduated scale, 6-compression nut, 7-compression spring, 8-adjusting screw, 9-coil end cover, 10-iron core, 11-coil, 12-brake release device and 13-bidirectional brake release rotating shaft.
In the "safety code for manufacturing and installing elevators" (GB 7588-2003), the following regulations apply to electromechanical brakes for elevators:
12.4.2.1 when the car is loaded with 125% of rated load and is moving down at rated speed, the brake should be operated to stop the machine. In the above case the deceleration of the car should not exceed the deceleration caused by the safety gear action or the car hitting the buffer.
All brake mechanisms participating in applying a braking force to the brake wheel or disc should be installed in groups. If one set of components is not functioning, there should still be sufficient braking force to decelerate a car carrying a rated load descending at a rated speed.
12.4.2.4 elevator drive machine with manual emergency operating device should be able to release the brake by hand and need to maintain its released state with a constant force.
Thus, as an important safety component of an elevator, GB7588-2003 has a certain safety redundancy requirement on the braking capacity of an elevator brake, and when the brake works normally, a traction machine which is loaded with a 125% rated load and descends at a rated speed can be stopped; in terms of reliability, mechanical parts are required to be installed in groups, and if one of the mechanical parts fails, the other mechanical part still has enough braking force to decelerate the cage carrying the rated load descending at the rated speed. When the brake release 12 is in a natural state, the brake shoes 3 of 2 (or more) independent brakes are all kept in a contracting state.
In the daily inspection of an elevator brake, we have found that some brakes of the type shown in fig. 1 are excessively worn due to insufficient adjustment or long-term brake operation of the brake, and the like, and only one group of braking devices is in a working state for a long time, and in an initial stage when only one group of braking devices is in action, the elevator can normally work, because the working clearance between the braking shoe 3 and the braking hub 1 is small, a group of failed braking shoes 3 seems to be still attached to the braking hub 1 when the elevator is braked, the situation cannot be easily found by visual inspection, and when overload occurs or another group of brakes have problems, an elevator safety accident can be caused.
In the test process of testing the braking capability of the drum brake, because two groups of mechanical components of the brake act simultaneously, the braking capability of the mechanical components of the single group of the brake required in 12.4.2.1 of GB7588-2003 cannot be verified, and if the performance of the single group of the mechanical components is reduced or completely fails, the test method is difficult to find according to the existing braking test method.
The reason for this is related to the structural characteristics of this type of brake, as shown in fig. 1, when the brake is de-energized, under the action of the compression spring 7, the brake arm 4, which is equipped with the brake shoe 3 and the brake release gap adjusting screw 8, may be limited by 2 mechanical elements, 1 by the brake hub 1 via the brake shoe 3, 2 by the iron core 10 via the brake release gap adjusting screw 8, or 2 limiting elements. Under the condition that the brake normally works, when the brake is powered off, the brake shoe 3 arranged on the brake arm 2 is limited by the brake hub 1 (as shown in the left group of mechanical parts in figure 1), namely, the brake shoe 3 is clung to the brake hub 1 to brake the brake hub 1 (d) 1 Zero) and the brake release gap adjusting bolt 8 installed on the brake arm 2 does not contact the iron core 10 but maintains a small gap (c of fig. 1) 1 ) However, if the brake is not properly adjusted or the brake shoe 3 is excessively worn, the brake release gap adjusting bolt 8 mounted on the brake arm 4 is limited by the right iron core 10 under the action of the hold-down spring 7 when the brake is off (c in fig. 1) 2 Zero) so that the brake shoes 3 are not in contact with the brake hub 1, i.e. there is a gap (d in fig. 1) 2 ) Or when the brake is de-energized, the brake arms 4 contact both the core 10 and the brake hub 1, which leaves a considerable safety hazard for elevator operation.
In a certain period of 2015, a journal of an elevator, namely 'Chinese elevator', an article of 'design of a single-group manual brake release wrench commonly used for drum brakes for elevators' is published, wherein a design structure and an inspection method of the manual brake release wrench are described in detail, as shown in fig. 2, after two wrench arms 11 rotate around an axis and are opened, a brake arm 4 of the drum brake and a coil end cover 9 outside a brake release coil 11 are separated from each other to release the brake, and the manual brake release wrench has the characteristics of simple structure and low manufacturing cost.
However, during the use process, the manual brake release wrench has the following disadvantages: the adjustable spring pressing force measuring device cannot be used for measuring the spring pressing force of the brake, the distance between the brake arm and the coil end cover is different due to different brands, models and specifications of elevators, the adjustable stroke of the adjusting screw is very limited, the adjusting screw with the corresponding size needs to be equipped for adapting to the brakes with different distances, a plurality of adjusting screws need to be carried, and inconvenience is brought to inspection and test work.
The pressing force of the brake pressing spring meets the relevant standards and specifications of elevator manufacturers and countries, and when the pressing force is too large or too small, the safety performance of the elevator is adversely affected, and when the pressing force of the pressing spring is too large, the band-type brake cannot be opened and the band-type brake operates, so that accidents are finally caused, or passengers feel uncomfortable and even fall down when the elevator is stopped accidentally; the pressing force of the pressing spring is too small, so that the elevator cannot be stopped in time, and serious consequences are caused.
The conventional brake adjusts the compression amount of the compression spring 7 by rotating the compression nut 6 to adjust the compression value of the spring force, which is obtained by observing a scale value of the scale 5 and the corresponding position of the brake arm (as shown in fig. 1). The method has the following defects: 1. the numerical value of the spring pressure is difficult to directly obtain, the spring pressure depends on data provided by a brake manufacturer, and particularly the actual pressure of the brake spring is difficult to control due to different spring manufacturers or production batches; 2. after the pressure of the brake spring changes due to aging or replacement in use, the adjusting method generates large errors; 3. some old elevators are usually adjusted by experience due to lack of data and accessories; 4. when the elevator brake is identified, corresponding data cannot be provided.
In other cases, the brake spring force measurement point is difficult to measure directly at the spring mounting location due to limitations of the elevator machine structure, requiring a specially made measuring tool.
It follows that the lack of a practical on-site testing device does not allow the pressing force of the pressing spring of such widely used elevator drum brakes to be detected, which leaves safety hazards and drawbacks for elevator operation.
Disclosure of Invention
The invention aims to provide a brake release wrench for checking a drum brake spring.
The technical scheme adopted by the invention for solving the technical problem is as follows: the brake release wrench for checking and correcting the drum brake spring comprises a distance adjusting assembly, a pressure sensor, a pair of tong heads, a pair of trigger handles and a distance fixing assembly, wherein the pair of tong heads are movably hinged through tong head pin shafts; the distance adjusting assembly consists of a sleeve-in-sleeve screw rod with an internal thread hole and an adjusting head with adjustable height of a bulge, and the sleeve-in-sleeve screw rod and the pressure sensor are arranged in the inner cavity of the circular ring; the distance subassembly comprises chi and the fastener that is equipped with the bar groove, a pair of trigger afterbody respectively is equipped with the through-hole, and the chi passes through the fastener to be installed in the trigger afterbody, through the elasticity of adjusting the fastener for the interval of fixed trigger afterbody.
Furthermore, the side surface perpendicular to the top surfaces of the tail parts of the pair of triggers is provided with anti-skid grains.
Furthermore, the surface of the ruler strip is provided with anti-skid grains and scales.
Preferably, in the brake release wrench for checking a drum brake spring, the distance assembly comprises a screw rod with a circular ring at one end and a nut mounted on the screw rod; the tail parts of the pair of triggers are respectively provided with a groove, and a through hole penetrating through the tail parts of the triggers is arranged in a manner of being vertical to the side surfaces of the grooves; the distance assembly penetrates through the groove in the tail of the trigger, one end of the distance assembly is movably connected with the tail of one trigger through the rivet, and the other trigger is fixed by adjusting the position of the nut on the distance assembly.
Furthermore, in the brake release wrench for checking the drum brake spring, the upper end parts of the two triggers are movably hinged with each other through the trigger pin shaft, the lower body parts of the two tong heads are respectively movably connected to the triggers through a rivet, and the lower body parts of the two tong heads are respectively embedded in the grooves in the upper parts of the two triggers.
Furthermore, the pressure sensor and the distance adjusting assembly which are respectively installed in the pair of pressing parts respectively press the brake arm and the coil cover of the drum brake to be away from each other.
Furthermore, the external thread of the screw rod sleeved in the sleeve is matched with the internal thread of the inner cavity of the circular ring, so that the height of the screw rod sleeved in the sleeve is adjusted.
Further, the adjusting head comprises a screw matched with the screw in the sleeve-in-sleeve screw in a threaded manner so as to adjust the height of the protrusion of the adjusting head.
Preferably, the lower body part or the trigger part of the tong head is provided with a threaded sleeve for storing the distance adjusting component.
The brake release wrench for checking the springs of the drum brake is used for measuring the pressing force of the compression springs of the drum brake.
The measuring process for measuring the hold-down force of a drum brake hold-down spring comprises the following steps:
(1) Placing a pair of tong heads of the brake releasing spanner at the same height as a brake spring to stop against between a brake arm and a coil cover;
(2) Compacting the brake release wrench continuously for three times to enable the brake release wrench to spread the brake arm and the coil cover;
(3) When the brake releasing spanner is pressed, the distance assembly is adjusted to fix the spanner handle, the distance between the tail ends of the spanner handle is measured, and the pressure value of the pressure sensor is read;
(4) Calculating the rigidity coefficient of the drum brake spring by using a spring characteristic formula and the distance and pressure values measured in the step (3);
(5) And calculating the pressing force of the spring brake arm of the drum brake.
The brake release wrench for checking the spring of the drum brake has the following beneficial effects: 1. the pressure sensor is arranged in the circular inner cavity of the pressing part and connected with the display instrument, and can measure the pressure of the compression spring when the pressing part presses the brake arm and the coil end cover of the drum brake when the pressing part applies pressure to the trigger to tighten the pair of triggers; 2. the interplanting sleeve screw rod is internally provided with a threaded hole, and the adjusting head connecting screw is assembled in the threaded hole, so that the adjusting head and the interplanting sleeve screw rod can be not replacedThe height of the adjusting head is adjusted downwards to adapt to the space between the brake arm and the coil end cover of the elevator brands with different specifications and models; 3. when a drum brake with a small distance between a brake arm and a coil end cover is measured, the opening of the circular inner cavity of the pressing part of the brake release wrench can be over against a convex part at a measuring point A, so that the brake release wrench is placed between the brake arm and the coil end cover, and the elevator mainframe structure with different specifications and models is suitable; 4. the distance assembly is arranged between the through holes or the grooves at the tail parts of the pair of triggers, and when the pressing part presses the brake arm, the distance between the brake arm and the coil end cover is in the L state 1 、L 2 Or L 3 When the position of the nut is fastened or adjusted through the fastening piece, when the triggers are not adjusted to the dead point, the pair of triggers can be separated from each other under the action of the moment applied to the brake release wrench by the compression spring, the distance between the triggers is locked, and the data of the pressure sensor can be read conveniently from the display instrument; 5. the ruler strip in the distance assembly is provided with scales, so that the distance between a pair of triggers at different intervals can be conveniently read, and the distance between the corresponding brake arm and the coil end cover can be converted through the specification and the size of the brake release wrench.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
fig. 1 is a schematic view illustrating a structural state of an elevator drum brake in the background art;
FIG. 2 is a schematic view showing the structure of the spanner head of the release wrench of embodiment 1 when it is folded to extend between the brake arm and the coil cover of FIG. 1;
FIG. 3 is a schematic structural view of the release wrench of embodiment 1 with the wrench head opened to stop the brake arm and the coil cover in FIG. 1;
FIG. 4 is a schematic configuration diagram of a cross section of j-j surface of the distance member in embodiment 1;
FIG. 5 is a schematic view of the hinge structure of the upper end of the two triggers of the spanner of this invention at section G-G in FIGS. 2 and 7;
FIG. 6 is a schematic view of the hinge structure of the lower bodies of the two binding clip bodies of the brake release wrench shown in the F-F section of FIGS. 2 and 7;
FIG. 7 is a schematic view showing the structure of the spanner head of the release wrench of embodiment 2 when it is folded to extend between the brake arm and the coil cover of FIG. 1;
FIG. 8 is a schematic view showing the structure of the spanner head of the brake release wrench of embodiment 2 when it is opened to abut between the brake arm and the coil cover of FIG. 1;
FIG. 9 is a structural schematic view of a cross section of the I-I face of the distance member assembly in example 2;
FIG. 10 is a structural schematic diagram in section of the H-H face of the distance member in embodiment 2;
FIG. 11 is a schematic structural view of a pair of pliers heads of the spanner for releasing the brake of the present invention;
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
To measure the pressing force of the drum brake hold-down spring, the force applying mechanism is placed at the same height as the brake spring (point A in FIG. 1) because the horizontal distance D between the center of rotation of the brake arm and the measuring surface is compared with the horizontal distance H 1 、H 2 The brake arm is much smaller, and for convenient calculation, D =0 is set, no acting force is generated between the brake shoe and the brake wheel, all the acting force generated by the compression spring is applied to the point A, and the measuring point of the brake arm is arranged at 3 positions A 1 (actual pressure of spring), A 2 (open to L) 2 Spring pressure in time), A 3 (open to L) 3 Spring pressure in time) is F 1 、F 2 、F 3 In FIG. 1, the brake arm measurement point is from L 1 Open to L 2 In the process, because the brake shoe is not completely separated from the brake wheel, an acting force exists between the brake shoe and the brake wheel, and when a measuring point of the brake arm is opened to L 2 Then, the brake shoe and the brake wheel are completely separated from contact, and A is 2 The acting force of is F 2 To measure the value of the stiffness coefficient K of the hold-down spring, the brake arm is opened to L3 and the corresponding value F is measured 3 For example, the spring characteristic formula, the stiffness coefficient of the spring: k＝(F 3 -F 2 )/(L 3 -L 2 ) Then the pressing force of the spring of the brake arm 4 is: f 1 ＝F 2 -K(L 2 -L 1 ). It is obvious that the relative distance of the tail end of the brake release wrench handle is changed in proportion to the opening distance of the brake release wrench head.
Example 1
A brake release wrench for calibrating drum brake springs in a preferred embodiment of the invention is shown in figure 2,3. The clamp comprises a distance adjusting assembly 3, a pressure sensor 302, an upper tong head 300, a lower tong head 400, an upper trigger 700, a lower handle 800 and a distance assembly 8, wherein a pair of tong heads are movably hinged through a tong head pin shaft 200, the tops of the tong heads are connected with pressing parts, circular inner cavities 301 are respectively arranged in one sides perpendicular to the top surfaces of the pressing parts, openings are arranged on the side surfaces of the circular inner cavities, and internal threads are arranged on the surfaces of the inner cavities; the distance adjusting assembly consists of a sleeve-in-sleeve screw 303 with an internal thread hole and an adjusting head 305 with adjustable protrusion height, and the sleeve-in-sleeve screw 303 and the pressure sensor 302 are arranged in the inner cavity of the circular ring; the distance assembly 8 is composed of a ruler 810 provided with a strip-shaped groove and a fastener, the fastener comprises a nut 822 and a washer 823, the tail parts of a pair of triggers are respectively provided with a through hole 812, the ruler is mounted at the tail parts of the triggers through the fastener, and the distance between the tail parts of the triggers is fixed by adjusting the tightness of the fastener.
The side surface vertical to the top surface of the tail parts of the pair of triggers is provided with an anti-skid thread 813.
The surface of the ruler strip is provided with anti-skid grains 813 and scales.
Referring to fig. 5 and 6, in the brake release wrench for verifying a drum brake spring according to the present invention, the upper ends of two triggers are movably hinged to each other by a trigger pin 500, the lower bodies of two bits are movably connected to the triggers by rivets 600 and 100, respectively, and the lower bodies of two bits are respectively inserted into the grooves of the upper ends of the two triggers.
Furthermore, a pressure sensor and a distance adjusting component which are respectively arranged in the pair of pressing parts respectively press the brake arm 4 and the coil cover 9 of the drum brake to be far away from each other, the pressure sensor is a ceramic pressure sensor, the pressure directly acts on the front surface of the ceramic diaphragm to enable the diaphragm to generate tiny deformation, a thick film resistor is printed on the back surface of the ceramic diaphragm to be connected into a Wheatstone bridge, the bridge generates a voltage signal which is in direct proportion to the pressure and is highly linear and is also in direct proportion to the excitation voltage due to the piezoresistive effect of the piezoresistor, standard signals such as different pressure ranges are marked into different voltages, and the standard signals are amplified by an instrumentation amplifier and transmitted to A/D conversion for display.
Furthermore, the external thread of the screw rod sleeved in the sleeve is matched with the internal thread of the inner cavity of the circular ring, so that the height of the screw rod sleeved in the sleeve is adjusted.
Further, the adjusting head comprises a screw matched with the screw in the sleeve-in-sleeve screw in a threaded manner so as to adjust the height of the protrusion of the adjusting head.
Preferably, as shown in fig. 8, the lower body or trigger of the binding clip is provided with a threaded sleeve 9 for storing the distance adjusting assembly.
Example 2
As shown in fig. 7 and 8, a brake release wrench for calibrating a drum brake spring in a preferred embodiment of the present invention. The clamp comprises a distance adjusting assembly 3, a pressure sensor 302, an upper tong head 300, a lower tong head 400, an upper trigger 700, a lower handle 800 and a distance assembly 8, wherein a pair of tong heads are movably hinged through a tong head pin shaft 200, the tops of the tong heads are connected with pressing parts, circular inner cavities 301 are respectively arranged in one sides perpendicular to the top surfaces of the pressing parts, openings are arranged on the side surfaces of the circular inner cavities, and internal threads are arranged on the surfaces of the inner cavities; the distance adjusting assembly consists of a sleeve-in-sleeve screw 303 provided with an internal thread hole and an adjusting head 304 with adjustable convex height, and the sleeve-in-sleeve screw and the pressure sensor 302 are arranged in the circular ring inner cavity 301; preferably, as shown in fig. 9 and 10, the distance assembly 8 includes a screw 810 provided with a circular ring at one side end and a nut 825 mounted on the screw; the tail parts of the pair of triggers are respectively provided with a groove, and through holes 812 and 820 penetrating through the tail parts of the triggers are arranged vertical to the side surfaces of the grooves; the distance assembly passes through the recess in the end of the trigger and one end 824 of the distance assembly is movably connected to one end of the trigger by means of a rivet 822 and a nut 821 to secure the other trigger by adjusting the position of the nut 825 on the distance assembly.
Referring to fig. 5 and 6, in the release wrench for checking a drum brake spring according to the present invention, the upper ends of two triggers are movably hinged to each other by a trigger pin 500, the lower bodies of two bits are movably connected to the triggers by rivets 600 and 100, respectively, and the lower bodies of two bits are respectively inserted into the grooves of the upper portions of the two triggers.
As shown in fig. 6, the pressure sensors 302 and the distance adjusting component 3 respectively installed in the pair of pressing parts respectively press the brake arm 4 and the coil cover 9 of the drum brake to be away from each other, the pressure sensors are ceramic pressure sensors, pressure directly acts on the front surface of the ceramic diaphragm to make the diaphragm generate micro deformation, the thick film resistor is printed on the back surface of the ceramic diaphragm to connect into a wheatstone bridge, due to the piezoresistive effect of the piezoresistors, the bridge generates a voltage signal which is highly linear and proportional to the pressure and is also proportional to the excitation voltage, the standard signals such as different pressure ranges are marked as different voltages, and the voltage signals are amplified by the instrumentation amplifier and transmitted to the a/D converter for display.
Furthermore, the external thread of the screw rod sleeved in the sleeve is matched with the internal thread of the inner cavity of the circular ring, so that the height of the screw rod sleeved in the sleeve is adjusted.
Further, the adjusting head comprises a screw matched with the screw in the sleeve-in-sleeve screw in a threaded manner so as to adjust the height of the protrusion of the adjusting head.
As shown in FIG. 8, the lower body or trigger of the binding clip is preferably provided with a threaded sleeve 9 for storing the distance adjusting assembly.
It is to be understood that the above-described respective technical features may be used in any combination without limitation.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a spanner that declutches for checking drum brake spring which characterized in that, includes roll adjustment subassembly, pressure sensor, a pair of binding clip, a pair of trigger, distance subassembly, and a pair of binding clip is through binding clip round pin axle activity hinge joint, its characterized in that: the tops of the pair of tong heads are connected with the pressing parts, circular inner cavities are respectively arranged in one sides perpendicular to the top surfaces of the pair of pressing parts, openings are arranged on the side surfaces of the circular inner cavities, and internal threads are arranged on the surfaces of the inner cavities; the distance adjusting assembly consists of a sleeve-in-sleeve screw rod with an internal thread hole and an adjusting head with adjustable height of a bulge, and the sleeve-in-sleeve screw rod and the pressure sensor are arranged in the inner cavity of the circular ring; the distance assembly consists of a ruler strip provided with a strip-shaped groove and a fastener, the tails of the pair of triggers are respectively provided with a through hole, the ruler strip is arranged at the tail of the trigger through the fastener, and the distance between the tails of the triggers is fixed by adjusting the tightness of the fastener;
the application of a brake release wrench for checking a drum brake spring in measuring the pressing force of the drum brake hold-down spring comprises the following steps:
(1) Placing a pair of tong heads of the brake releasing spanner at the same height as a brake spring to stop against between a brake arm and a coil cover;
(2) Compacting the brake release wrench continuously for three times to enable the brake release wrench to spread the brake arm and the coil cover;
(3) When the brake releasing spanner is pressed, the distance assembly is adjusted to fix the spanner handle, the distance between the tail ends of the spanner handle is measured, and the pressure value of the pressure sensor is read;
(4) Calculating the rigidity coefficient of the drum brake spring by using a spring characteristic formula and the distance and pressure values measured in the step (3);
(5) And calculating the pressing force of the spring brake arm of the drum brake.
2. A brake release wrench for calibrating a drum brake spring as claimed in claim 1, wherein: the side surface vertical to the top surfaces of the tails of the pair of triggers is provided with anti-skid grains; the surface of the ruler strip is provided with anti-skid grains and scales.
3. A brake release wrench for calibrating a drum brake spring according to claim 1, further comprising: the distance assembly comprises a screw rod with a circular ring arranged at one side end part and a nut arranged on the screw rod; the tail parts of the pair of triggers are respectively provided with a groove, and a through hole penetrating through the tail parts of the triggers is arranged in a manner of being vertical to the side surfaces of the grooves; the distance assembly penetrates through the groove in the tail of the trigger, one end of the distance assembly is movably connected with the tail of one trigger through a rivet, and the other trigger is fixed by adjusting the position of a nut on the distance assembly.
4. A brake release wrench for calibrating a drum brake spring as claimed in claim 1, wherein: the upper ends of the two triggers are movably hinged with each other through a trigger pin shaft, the lower bodies of the two tong heads are respectively movably connected on the triggers through a rivet, and the lower bodies of the two tong heads are respectively embedded in the grooves at the upper parts of the two triggers.
5. A brake release wrench for calibrating a drum brake spring as claimed in claim 1, wherein: the pressure sensors and the distance adjusting assemblies which are respectively arranged in the pair of pressing parts respectively press the brake arm and the coil cover of the drum brake to be away from each other.
6. The brake release wrench for verifying a drum brake spring as set forth in claim 1, wherein said set-in-sleeve screw external thread is engaged with the annular internal cavity internal thread to adjust a height of said set-in-sleeve screw.
7. The release wrench for verifying a drum brake spring as set forth in claim 1, wherein said adjustment head includes a screw for mating with an internal thread of said set screw in said set to adjust a height of a protrusion of said adjustment head.
8. A brake release wrench as claimed in any one of claims 1 to 7 for calibrating a drum brake spring, adapted to measure the hold down force of a drum brake hold down spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710910710.1A CN107443283B (en) | 2017-09-29 | 2017-09-29 | A spanner that declutches for checking drum brake spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710910710.1A CN107443283B (en) | 2017-09-29 | 2017-09-29 | A spanner that declutches for checking drum brake spring |
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| Publication Number | Publication Date |
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| CN107443283A CN107443283A (en) | 2017-12-08 |
| CN107443283B true CN107443283B (en) | 2023-04-07 |
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| CN201710910710.1A Active CN107443283B (en) | 2017-09-29 | 2017-09-29 | A spanner that declutches for checking drum brake spring |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2273237Y (en) * | 1996-10-23 | 1998-01-28 | 杨海涛 | Tongs-spanner |
| JP2011121669A (en) * | 2009-12-09 | 2011-06-23 | Nippon Otis Elevator Co | Abnormality detecting device of electromagnetic brake in elevator |
| JP2014084937A (en) * | 2012-10-23 | 2014-05-12 | Volvo Lastvagnar Aktiebolag | Drum brake device |
| CN204265152U (en) * | 2014-06-06 | 2015-04-15 | 浙江工业大学之江学院 | The omnidistance real-time inspection and control system of a kind of elevator brake performance |
| CN204147090U (en) * | 2014-08-15 | 2015-02-11 | 张锐 | A kind of Novel bone holding forceps |
| CN205497304U (en) * | 2016-03-31 | 2016-08-24 | 深圳市特种设备安全检验研究院 | Drum brake singly organizes manual spanner that declutches energetically |
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