CN113184698B - Spring force detection device and method of traveling hydraulic push rod brake - Google Patents
Spring force detection device and method of traveling hydraulic push rod brake Download PDFInfo
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- CN113184698B CN113184698B CN202010037303.6A CN202010037303A CN113184698B CN 113184698 B CN113184698 B CN 113184698B CN 202010037303 A CN202010037303 A CN 202010037303A CN 113184698 B CN113184698 B CN 113184698B
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- spring
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- push rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
- F16D49/16—Brakes with two brake-blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C9/00—Travelling gear incorporated in or fitted to trolleys or cranes
- B66C9/18—Travelling gear incorporated in or fitted to trolleys or cranes with means for locking trolleys or cranes to runways or tracks to prevent inadvertent movements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/005—Force, torque, stress or strain
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a spring force detection device and a method of a traveling hydraulic push rod brake, wherein the device comprises a fixing plate (1), a connecting plate (2), a connecting bolt (3), a locking nut (4) and a torque wrench (5); the pair of fixed plates are oppositely arranged and symmetrically arranged on the two triangular transmission plates (108) of the hydraulic push rod brake; the pair of connecting plates are correspondingly arranged at the tops of the pair of fixing plates, are connected in an attaching mode through connecting bolts and are locked and fixed through locking nuts, and therefore the spring force detection device is fixedly arranged on the triangular transmission plate; the torque wrench is installed on a pair of connecting plates, rotates and drives the triangular transmission plate to synchronously rotate through the connecting plates and the fixing plate, and a torque display disc (51) is arranged on the torque wrench. According to the invention, when the length of the spring is adjusted, the accuracy of the adjustment of the length of the spring is improved, the adjustment time of the length of the spring is shortened and the same braking force at two sides of a travelling crane is ensured by comparing the torque detection value with the torque standard value.
Description
Technical Field
The invention relates to a detection device and a detection method for a crane service brake, in particular to a spring force detection device and a spring force detection method for a hydraulic push rod brake of a crane.
Background
The crane, i.e. a crane, is mainly used for hoisting various steel coils, plates, wires, steel pipes and the like, and the left side and the right side of the crane are respectively provided with a hydraulic push rod brake for braking and parking, such as a hydraulic push rod brake with the model number of YWZ 300. Referring to fig. 1 and 2, after the crane lifts the goods to a predetermined height during operation, the speed reducer 100 at the crane operates to drive the crane wheels 102 to rotate through the cardan shaft 101 and slide along the rails 103, so that when the crane travels to a designated location, the output end of the hydraulic push rod 104 is connected to one end of the triangular transmission plate 108, the bottom of the other end of the triangular transmission plate 108 is connected to one end of the brake 105, the top of the other end of the triangular transmission plate 108 is connected to the other end of the brake 105 through the transmission rod 109, the long bolt 121 is installed in the brake 105 through the nut 122, the two ends of the spring 107 are respectively installed on the long bolt 121 through the movable pressing plate 120 and the fixed pressing plate 123, the brake wheel 106 is installed in the brake 105, the hydraulic push rod 104 controls the rotation of the triangular transmission plate 108 through the transmission rod 109, and the two ends of the brake 105 rotate relatively through the transmission rod 109 to clamp, the spring 107 on the long bolt 121 in the brake 105 is compressed, and the brake wheel 106 is clamped and braked through the pair of the brake pads 110, thereby achieving the purpose of controlling the crane to stop operation.
Because the tonnage of the hoisting operation is large and the daily operation is busy, the spring is aged and the performance is reduced after the hydraulic push rod brake is used for a long time. In the process of driving site operation, if the elastic force of a spring of the hydraulic push rod brake is too small, namely the braking force is too small, the driving braking stroke exceeds the standard; if the elastic force of the spring is too large, that is, the braking force is too large, the abrasion of each movable joint/joint pin of the brake is increased, and the brake is damaged. If the braking force of the hydraulic push rod brakes on the left side and the right side of the travelling crane is inconsistent, the conditions of high speed on one side and low speed on the other side can occur during the braking of the travelling crane, so that the travelling crane is severely twisted, great damage is generated to wheels, horizontal wheels and a steel structure of the travelling crane, and unhooking and falling of hoisted goods are extremely easily caused. Therefore, the magnitude of the braking force of the hydraulic push rod brake spring needs to be adjusted by adjusting the length of the hydraulic push rod brake spring.
The hydraulic push rod brake can adjust a brand new spring to a standard length at the initial stage of use so as to ensure the braking force, the length adjustment of the aged spring has no specific standard, the spring can be adjusted only by experience in the adjustment process, and the situation that the braking forces of brakes at two sides of a service are inconsistent frequently occurs, so that the vehicle body is seriously twisted during service braking. For solving the condition that the service braking is twisted, the springs of the hydraulic push rod brakes on the left side and the right side need to be adjusted and trial run for many times, and due to the fact that no specific detection standard exists, the adjusting difficulty of the springs is large, the adjusting time is long, the final effect is not ideal, the normal hoisting operation of the service is influenced, and great fluctuation is brought to the stability of the whole transportation, storage and logistics system.
In addition, because the detection and adjustment can not meet the requirement of safe operation, frequent replacement of the spring and even replacement of the whole hydraulic push rod brake are feasible schemes for recovering the driving performance, but the cost for replacing new parts is high, and especially the cost investment is greatly increased for replacing the whole hydraulic push rod brake.
Disclosure of Invention
The invention aims to provide a spring force detection device and a spring force detection method for a hydraulic push rod brake of a traveling crane.
The invention is realized by the following steps:
a spring force detection device and method of a hydraulic push rod brake of a traveling crane comprise a fixing plate, a connecting bolt, a locking nut and a torque wrench; the pair of fixed plates are oppositely arranged and symmetrically arranged on the two triangular transmission plates of the hydraulic push rod brake; the pair of connecting plates are correspondingly arranged at the tops of the pair of fixing plates respectively, are connected in an attaching mode through bolt holes through connecting bolts and are locked and fixed through locking nuts, and therefore the spring force detection device is fixedly arranged on the triangular transmission plate; the torque wrench is provided with connecting blocks, the pair of connecting plates are provided with connecting holes, the torque wrench is fixedly installed on the connecting holes of the pair of connecting plates through the connecting blocks, the torque wrench rotates and drives the triangular transmission plate to synchronously rotate through the connecting plates and the fixing plate, and the torque wrench is provided with a torque display disc.
The top and the bottom of fixed plate all be equipped with the flange, triangle driving plate fixing clip is put between the flange of fixed plate top and bottom, makes triangle driving plate and fixed plate simultaneous movement.
The flange at the top of the fixing plate is of an inclined surface structure, so that the top end inclined surface of the triangular transmission plate can be matched and attached with the flange at the top of the fixing plate.
A spring force detection method of a hydraulic push rod brake of a traveling crane comprises the following steps:
step 1: measuring a standard value of the torque force;
step 2: the spring force detection device is fixedly arranged on two triangular transmission plates of the hydraulic push rod brake to be detected through a fixing plate;
and 3, step 3: rotating a torque wrench to drive the triangular transmission plate to rotate anticlockwise, and recording a numerical value displayed by a torque display disc as a torque detection value when an aged spring is about to be compressed;
and 4, step 4: and adjusting the length of the aged spring according to the torsion value until the adjusted torsion detection value is equal to the torsion standard value.
In the step 1, the torsion standard value is determined by the following method:
step 1.1: a brand new spring is arranged on the hydraulic push rod brake and is adjusted to a standard length;
step 1.2: the spring force detection device is fixedly arranged on a triangular transmission plate of the hydraulic push rod brake with a brand new spring through a fixing plate;
step 1.3: and pulling the torque wrench, and recording the display numerical value of the torque display disc as a standard numerical value when a brand-new spring is about to be compressed.
The method for judging that the spring is about to be compressed comprises the following steps: the torque wrench rotates anticlockwise and drives the triangular transmission plate to rotate synchronously, so that the triangular transmission plate drives the brake to clamp through the transmission rod and compress the spring, and the moment when the fixed pressing plate and the long bolt move relatively is the moment when the spring is about to be compressed.
In the step 4, the length adjustment method of the spring comprises the following steps: if the torque detection value is smaller than the torque standard value, the length of the spring is shortened, so that the elasticity of the spring is increased; if the detected value of the torsion is larger than the standard value of the torsion, the length of the spring is lengthened, and the elasticity of the spring is reduced.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention takes the torsion of a brand-new spring with standard length to be compressed as the torsion standard value, is convenient to compare with the torsion detection value, forms a uniform adjustment standard and provides accurate guidance for adjusting the length of the spring of the hydraulic push rod brake.
2. The invention adopts the torque wrench with the torque display disc, and can display the braking torque in real time, thereby timely finding the condition of overlarge or undersize braking force, providing data support for the adjustment of the length of the spring and ensuring that the length of the spring is adjusted within a reasonable range.
3. The invention ensures that the braking forces at two sides of the travelling crane are the same by comparing the detected value of the torsion with the standard value, thereby avoiding the situation of left and right torsion swing caused by different braking forces at two sides in the process of braking the travelling crane, playing a better protection role on wheels, horizontal wheels, steel structures and the like of the travelling crane and reducing the failure rate.
The invention takes the torsion force when the brand new spring is about to contract as the torsion force standard value, the torsion force wrench drives the torsion force when the aging spring is about to compress as the torsion force detection value, and the torsion force detection value is only required to be adjusted to be equivalent to the torsion force standard value when the length of the spring is adjusted, thereby not only improving the accuracy of the adjustment of the length of the spring, shortening the adjustment time of the length of the spring, but also ensuring the same braking force at two sides of a traveling crane and avoiding the occurrence of torsion pendulum in the braking process of the traveling crane, thereby improving the operating efficiency of the traveling crane and ensuring the safe, efficient and stable operation of the traveling crane.
Drawings
FIG. 1 is a structure diagram of driving and braking a cart in a traveling crane in the prior art;
FIG. 2 is a schematic diagram of a prior art service hydraulic push rod brake;
FIG. 3 is an exploded view of the spring force sensing device of the service hydraulic pushrod brake of the present invention;
FIG. 4 is a side view of a fixed plate in the spring force sensing device of the service hydraulic push rod brake of the present invention;
FIG. 5 is a front view of the spring force sensing device of the service hydraulic push rod brake of the present invention installed;
FIG. 6 is a side view of the installation of the spring force sensing device of the service hydraulic pushrod brake of the present invention;
FIG. 7 is a flow chart of a spring force detection method of the service hydraulic push rod brake of the present invention.
In the figure, 1 a fixing plate, 11 flanges, 2 connecting plates, 21 bolt holes, 22 connecting holes, 3 connecting bolts, 4 locking nuts, 5 torque wrenches, 51 torque display plates, 52 connecting blocks, 100 speed reducers, 101 cardan shafts, 102 cart wheels, 103 rails, 104 hydraulic push rods, 105 brakes, 106 brake wheels, 107 springs, 108 triangular transmission plates, 109 transmission rods, 110 brake plates, 120 fixed pressing plates, 121 long bolts, 122 nuts and 123 movable pressing plates.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 3 and 4, the spring force detection device of the hydraulic push rod brake of the traveling crane comprises a fixing plate 1, a connecting plate 2, a connecting bolt 3, a locking nut 4 and a torque wrench 5; referring to fig. 5 and fig. 6, a pair of fixing plates 1 are oppositely arranged and symmetrically installed on two triangular transmission plates 108 of the hydraulic push rod brake; the pair of connecting plates 2 are respectively and correspondingly arranged at the tops of the pair of fixing plates 1, the pair of connecting plates 2 are connected in an attaching mode through the bolt holes 21 through the connecting bolts 3 and are locked and fixed through the locking nuts 4, the spring force detection device is fixedly arranged on the triangular transmission plate 108, and the pair of fixing plates 1 can hold the triangular transmission plate 108 tightly; the torque wrench 5 is provided with a connecting block 52, the pair of connecting plates 2 are provided with connecting holes 22, the torque wrench 5 is fixedly installed on the connecting holes 22 of the pair of connecting plates 2 through the connecting block 52, the connecting holes 22 are generally square, the corresponding connecting block 52 is also square and matched with the connecting block 22, or the connecting block 52 and the connecting holes 22 can be fastened through a fixing part, so that the torque wrench 5 is ensured to rotate and drives the triangular transmission plate 108 to synchronously rotate through the connecting plates 2 through the fixing plate 1, and the torque wrench 5 is provided with a torque display disc 51 for recording a torque value corresponding to the rotation of the torque wrench 5.
The top and the bottom of fixed plate 1 all be equipped with flange 11, the fixed card of triangle driving plate 108 is put between the flange 11 of fixed plate 1 top and bottom, makes triangle driving plate 108 can with fixed plate 1 simultaneous movement to ensure that torque wrench 5 drives triangle driving plate 108 pivoted synchronism through fixed plate 1, and then realize spring 107 compression and tensile accurate control.
Referring to fig. 4, the flange 11 at the top of the fixing plate 1 is an inclined surface structure, so that the inclined surface at the top of the triangular transmission plate 108 can be matched and attached to the flange 11 at the top of the fixing plate 1, thereby ensuring the reliability of installation and rotating force transmission.
Referring to fig. 7, a method for detecting a spring force of a hydraulic push rod brake of a traveling crane includes the following steps:
step 1: and (6) measuring a standard value of the torsion.
The method for measuring the standard value of the torsion force comprises the following steps:
step 1.1: a new spring 107 is mounted on the hydraulic push rod brake and adjusted to a standard length.
Step 1.2: the spring force detection device is fixedly arranged on a triangle transmission plate 108 of the hydraulic push rod brake with a brand-new spring 107 through the fixing plate 1.
Step 1.3: when the torque wrench 5 is wrenched, the displayed value of the torque display plate 51 is recorded as the standard value when the new spring 107 is about to be compressed.
Step 2: the spring force detection device is fixedly arranged on two triangular transmission plates 108 of the hydraulic push rod brake to be detected through the fixing plate 1.
And step 3: when the torque wrench 5 is rotated to drive the triangular transmission plate 108 to rotate counterclockwise, the display value of the torque display panel 51 is recorded as the torque detection value when the aged spring 107 is about to be compressed.
The method for determining that the spring 107 is about to be compressed is as follows: the torque wrench 5 rotates counterclockwise and drives the triangular transmission plate 108 to rotate synchronously, so that the triangular transmission plate 108 drives the brake 105 to clamp through the transmission rod 109 and compress the spring 107, and the moment when the fixed pressing plate 120 and the long bolt 121 move relatively is the moment when the spring 107 is about to compress. The compression threshold point position can be determined in this manner for either a new or an aged spring 107.
And 4, step 4: the length of the aged spring 107 is adjusted according to the torsion value until the adjusted torsion detection value is equal to the torsion standard value.
The length adjusting method of the spring 107 comprises the following steps: if the detected value of the torsion is smaller than the standard value of the torsion, the length of the spring 107 is shortened, so that the elasticity of the spring 107 is increased; if the detected value of the torsion is larger than the standard value of the torsion, the length of the spring 107 is lengthened, so that the elastic force of the spring 107 is reduced.
Referring to fig. 5, the length standard value of the new spring 107 installed on the hydraulic push rod 4 is 21cm, the torque wrench 5 is used to detect the elasticity of the spring 107 when it is about to compress, and the standard value of the torque wrench is 80n.m.
Example 1: when the spring force of the brake of the 5# service cart in the railway depot is detected, the length of the spring 107 is found to be 19.5cm, the detection value of the torque wrench 5 is 60N.m and is smaller than the standard value 80N.m, which shows that the elastic force of the spring 107 is too small, the braking force of the brake 5 is too small, the braking distance exceeds the standard value, the spring 107 needs to be compressed and adjusted, the wrench acts on the locking nut 122, the nut 122 is rotated in the tightening direction to complete the compression of the spring 107, and the torque wrench 5 is used for continuously detecting the elastic force of the spring 107 after the compression until the torque display disc 51 displays the standard value 80N.m, so that the adjustment can be completed.
Example 2: when the spring force of the brake of the railway depot # 8 service cart is detected, the length of the spring is 21cm, the detection value of the torque wrench 5 is 100N.m, which is larger than the standard value 80N.m, which indicates that the elasticity of the spring 107 is too large, the abrasion of the brake pad 110 is accelerated, the service brake is rough, the spring 107 needs to be compressed and adjusted, the wrench acts on the nut 122, the nut 122 is rotated in the loosening direction to complete the release of the spring 107, and the torque wrench 5 is used to continue to detect the elasticity of the spring 107 after the release until the torque display disc 51 displays the standard value 80N.m, so that the adjustment can be completed.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a spring force detection device of driving hydraulic push rod stopper, characterized by: comprises a fixing plate (1), a connecting plate (2), a connecting bolt (3), a locking nut (4) and a torque wrench (5); the pair of fixed plates (1) are oppositely arranged and symmetrically arranged on two triangular transmission plates (108) of the hydraulic push rod brake; the pair of connecting plates (2) are respectively and correspondingly arranged at the tops of the pair of fixing plates (1), the pair of connecting plates (2) are connected in an attaching mode through bolt holes through connecting bolts (3) and are locked and fixed through locking nuts (4), and the spring force detection device is fixedly arranged on the triangular transmission plate (108); be equipped with the connecting block on torque wrench (5), all be equipped with the connecting hole on a pair of connecting plate (2), torque wrench (5) pass through connecting block fixed mounting on the connecting hole of a pair of connecting plate (2), and torque wrench (5) rotate and drive triangle driving plate (108) synchronous rotation through connecting plate (2) through fixed plate (1), are equipped with torque display dish (51) on torque wrench (5).
2. The spring force sensing device of a service hydraulic tappet brake as claimed in claim 1, wherein: the top and the bottom of fixed plate (1) all be equipped with flange (11), triangle driving plate (108) fixed card is put between flange (11) of fixed plate (1) top and bottom, makes triangle driving plate (108) can with fixed plate (1) simultaneous movement.
3. The spring force detection device of a traveling hydraulic push rod brake as claimed in claim 2, wherein: the flange (11) at the top of the fixing plate (1) is of an inclined surface structure, so that the inclined surface at the top end of the triangular transmission plate (108) can be matched and attached with the flange (11) at the top of the fixing plate (1).
4. A spring force detection method of a service hydraulic push rod brake using the spring force detection device of a service hydraulic push rod brake according to claim 1, characterized by: the method comprises the following steps:
step 1: measuring a standard value of the torque force;
step 2: the spring force detection device is fixedly arranged on two triangular transmission plates (108) of a hydraulic push rod brake to be detected through a fixing plate (1);
and 3, step 3: rotating the torque wrench (5) to drive the triangular transmission plate (108) to rotate anticlockwise, and recording a display value of the torque display disc (51) as a torque detection value when the aged spring (107) is about to be compressed;
and 4, step 4: the length of the aged spring (107) is adjusted according to the torsion value until the adjusted torsion detection value is equal to the torsion standard value.
5. The method for detecting the spring force of a traveling hydraulic push rod brake as claimed in claim 4, wherein the method comprises the following steps: in the step 1, the torsion standard value is determined by the following method:
step 1.1: a brand new spring (107) is arranged on the hydraulic push rod brake and is adjusted to a standard length;
step 1.2: the spring force detection device is fixedly arranged on a triangular transmission plate (108) of a hydraulic push rod brake with a brand new spring (107) through a fixing plate (1);
step 1.3: when the torque wrench (5) is wrenched, the display value of the torque display plate (51) is recorded as the standard value when the brand-new spring (107) is about to be compressed.
6. The method for detecting the spring force of a service hydraulic push rod brake as claimed in claim 4 or 5, wherein the method comprises the following steps: the method for judging that the spring (107) is about to be compressed comprises the following steps: the torque wrench (5) rotates anticlockwise and drives the triangular transmission plate (108) to rotate synchronously, so that the triangular transmission plate (108) drives the brake (105) to clamp through the transmission rod (109) and compress the spring (107), and the moment when the fixed pressing plate (120) and the long bolt (121) move relatively is the moment when the spring (107) is to be compressed.
7. The method for detecting the spring force of a traveling hydraulic push rod brake as claimed in claim 4, wherein the method comprises the following steps: in the step 4, the length adjusting method of the spring (107) comprises the following steps: if the torque detection value is smaller than the torque standard value, the length of the spring (107) is shortened, so that the elastic force of the spring (107) is increased; if the detected value of the torsion is larger than the standard value of the torsion, the length of the spring (107) is lengthened, so that the elastic force of the spring (107) is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010037303.6A CN113184698B (en) | 2020-01-14 | 2020-01-14 | Spring force detection device and method of traveling hydraulic push rod brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010037303.6A CN113184698B (en) | 2020-01-14 | 2020-01-14 | Spring force detection device and method of traveling hydraulic push rod brake |
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| Publication Number | Publication Date |
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| CN113184698A CN113184698A (en) | 2021-07-30 |
| CN113184698B true CN113184698B (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010037303.6A Active CN113184698B (en) | 2020-01-14 | 2020-01-14 | Spring force detection device and method of traveling hydraulic push rod brake |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713238A (en) * | 1994-08-17 | 1998-02-03 | Nai Anchorlok, Inc. | Spring brake actuator with spring force measurement |
| TW200804041A (en) * | 2006-07-12 | 2008-01-16 | Matatakitoyo Tool Co Ltd | Structure of torque wrench |
| CN101975670A (en) * | 2010-09-08 | 2011-02-16 | 同济大学 | Device for stimulating braking characteristics of railway wheel pair |
| CN103979379A (en) * | 2014-06-06 | 2014-08-13 | 浙江工业大学之江学院 | Elevator brake performance whole process real-time monitoring control system and using method |
| CN107244597A (en) * | 2017-06-16 | 2017-10-13 | 深圳市特种设备安全检验研究院 | The measurement apparatus of elevator drum brake spring force |
| CN110077984A (en) * | 2019-04-18 | 2019-08-02 | 宁波市凹凸重工有限公司 | A kind of system and method for crane brake safety monitoring control |
-
2020
- 2020-01-14 CN CN202010037303.6A patent/CN113184698B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713238A (en) * | 1994-08-17 | 1998-02-03 | Nai Anchorlok, Inc. | Spring brake actuator with spring force measurement |
| TW200804041A (en) * | 2006-07-12 | 2008-01-16 | Matatakitoyo Tool Co Ltd | Structure of torque wrench |
| CN101975670A (en) * | 2010-09-08 | 2011-02-16 | 同济大学 | Device for stimulating braking characteristics of railway wheel pair |
| CN103979379A (en) * | 2014-06-06 | 2014-08-13 | 浙江工业大学之江学院 | Elevator brake performance whole process real-time monitoring control system and using method |
| CN107244597A (en) * | 2017-06-16 | 2017-10-13 | 深圳市特种设备安全检验研究院 | The measurement apparatus of elevator drum brake spring force |
| CN110077984A (en) * | 2019-04-18 | 2019-08-02 | 宁波市凹凸重工有限公司 | A kind of system and method for crane brake safety monitoring control |
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