CN117990253A - Force measuring device for pull rope and use method - Google Patents

Abstract

The invention relates to a force measuring device for a pull rope and a use method thereof, wherein the force measuring device comprises a vertical bracket, a pulley assembly, a tension meter, a driving piece and a sliding rail assembly; the slide rail assembly comprises a guide rail and a slide block, the guide rail is arranged on the vertical support, the slide block is arranged on the guide rail and can slide along the guide rail, and the tension meter is connected to the slide block so as to slide along the slide block. The pulley assembly comprises at least one fixed pulley, at least one movable pulley and a pulley line, wherein the at least one movable pulley is arranged on the sliding block to slide along the sliding block, at least part of the at least one fixed pulley is fixed on the top end of the vertical support, one end of the pulley line is fixed on the vertical support, the other end of the pulley line is fixed on the driving piece, and part of the line segment of the pulley line is wound on the at least one fixed pulley and the at least one movable pulley, so that: the tension meter can be driven by the driving piece to slide along the guide rail through the pulley assembly. When measuring force, one end of the pull rope to be measured is connected with the pull ring of the tension meter. According to the invention, through the cooperation of the pulley assembly and the driving piece, compared with the traditional force measuring device, a larger force value can be achieved and the production cost is effectively reduced under the condition of outputting smaller force.

Description

Force measuring device for pull rope and use method

Technical Field

The invention relates to the field of sensor equipment detection, in particular to a force measuring device for a pull rope and a using method.

Background

The stay cord sensor mainly comprises a flexible cable, a spring type winding drum and a sensor assembly, is used for accurately measuring linear positions, has a travel ranging from hundreds of millimeters to tens of meters, and is a precise length measuring device. The flexible cable is mainly made of a steel wire rope, and is used as a main component of the pull rope sensor, so that the bearing capacity of the flexible cable is required to be detected. At present, the mode of carrying out tension detection on a steel wire rope is to install pull rings at two ends of the steel wire rope and install the pull rings on a push-pull force meter frame, the frame is usually a hand-operated screw rod, and whether the steel wire rope can bear a target force value or not is tested by applying force to the hand-operated screw rod.

At present, tension measuring devices are divided into an automatic type and a manual type, and the automatic type is provided with a universal tension tester which is driven by a motor or a hydraulic system to obtain larger tension. The manual hand dynamometer is driven by a hand screw rod or a gear rack, the pulling force is provided manually, and the force amplification factor depends on the lever proportion, namely the ratio of the hand wheel to the screw rod radius or the ratio of the length of a handle rocker to the gear radius.

However, the manual driving mode is adopted, if manual driving is adopted, the manpower is limited, the force measuring requirement of a larger target value cannot be met, batch detection is not applicable, and the force measuring value is difficult to be stabilized at the target value only by means of thread self-locking and manpower, so that the measuring accuracy is influenced. If the motor is used for driving, a motor or a hydraulic system with larger power is needed, the structure is complex and the cost is high, and the motor or the hydraulic system cannot be suitable for small laboratories or research and development sites.

Therefore, the prior art has the problem that the force measurement scale and the production cost are difficult to be compatible.

Disclosure of Invention

The invention provides a force measuring device for a pull rope and a use method thereof, which solve the problem that the force measuring scale and the production cost are difficult to be compatible in the prior art.

The invention provides a force measuring device for a pull rope, which comprises a vertical bracket, a pulley assembly, a tension meter, a driving piece and a sliding rail assembly, wherein the pulley assembly is arranged on the vertical bracket; the slide rail assembly comprises a guide rail and a slide block, the guide rail is arranged on the vertical support, the slide block is arranged on the guide rail and can slide along the guide rail, and the tension meter is connected with the slide block so as to slide along with the slide block;

The pulley assembly comprises at least one fixed pulley, at least one movable pulley and a pulley line, wherein the at least one movable pulley is arranged on the sliding block to slide along the sliding block, at least part of the at least one fixed pulley is fixed on the top end of the vertical support, one end of the pulley line is fixed on the vertical support, the other end of the pulley line is fixed on the driving piece, and part of the line segment of the pulley line is wound on the at least one fixed pulley and the at least one movable pulley, so that: the tension meter can be driven by the driving piece to slide along the guide rail through the pulley assembly;

when measuring force, one end of the pull rope to be measured is connected with the pull ring of the tension meter.

According to the invention, through the cooperation of the pulley assembly and the driving piece, compared with the traditional force measuring device, a larger force value can be achieved under the condition of outputting smaller force, the force measuring device meets the force measuring requirement of a larger target value, is more suitable for batch force measurement, is beneficial to improving the force measuring scale, and can reduce the input cost of the driving end (such as personnel input, output power of a motor and the like) no matter manual driving or motor driving is adopted, so that the production cost can be effectively reduced.

Optionally, the device further comprises a wire pressing assembly, and the driving piece comprises a reel and a handle rocker;

The other end of the pulley wire is connected with the reel, and part of the line segment of the pulley wire is wound on the reel, and the handle rocker is connected with the wheel shaft of the reel so as to drive the reel to rotate around the wheel shaft;

The line ball subassembly includes line ball section of thick bamboo and clamp plate, and the clamp plate can laminate in the circumference lateral wall of line ball section of thick bamboo, and during the dynamometry, the partial rope segment of the stay cord that awaits measuring winds to establish and the centre gripping compresses tightly between line ball section of thick bamboo and clamp plate.

The pulley wire is wound on the reel, so that the friction force of the pulley wire on the reel can be greatly increased, the stability and accuracy of the pulley assembly in the running process can be greatly increased, the pull rope to be tested is clamped and fixed through the wire pressing assembly in the force measuring process, the friction force is further increased through winding the pull rope to be tested on the wire pressing cylinder, movement and deflection can be avoided when the pull rope to be tested is stressed, and the stability and accuracy of the whole force measuring device can be increased through cooperation of the reel, the handle rocker and the wire pressing assembly, so that the accuracy of force measuring can be effectively improved.

Optionally, the driving member further comprises a ratchet mechanism and a mounting table;

The reel is located the downside of mount table, and ratchet installs in the side that the mount table was kept away from the reel, and the shaft of reel passes ratchet and connects to the handle rocker to by the step-by-step rotation of handle rocker drive along anticlockwise or clockwise according to the pitch.

Optionally, the ratchet mechanism comprises a housing, a ratchet, a first pawl, a second pawl, and a direction-adjusting button;

The shell is internally provided with a ratchet cavity and a pawl cavity which are communicated with each other, a ratchet is arranged in the ratchet cavity, a first pawl and a second pawl are positioned in the pawl cavity, a rotating part of the first pawl and a rotating part of the second pawl are respectively and rotatably connected to the inner wall of the shell, and a direction-adjusting buckle is positioned between the first pawl and the second pawl;

The steering button can be switched between a first position and a second position, when the steering button is positioned at the first position, the meshing part of the first pawl is meshed with the ratchet wheel and the second pawl is not meshed with the ratchet wheel, and when the steering button is positioned at the second position, the meshing part of the second pawl is meshed with the ratchet wheel and the first pawl is not meshed with the ratchet wheel, so that: the ratchet wheel can only rotate in one direction.

According to the embodiment of the invention, bidirectional winding (anticlockwise or clockwise) and self-locking of the pulley wire can be realized through the ratchet mechanism, and the cooperation of the ratchet, the pawl and the direction-adjusting buckle enables the whole pulley assembly to have better self-locking performance, so that the target force value can be maintained for a long time without additional manual control, and the accuracy of force measurement is improved.

Optionally, the ratchet mechanism further includes a first elastic member and a second elastic member, the first elastic member is disposed between the inner wall of the housing and the first pawl, and the second elastic member is disposed between the inner wall of the housing and the second pawl; the direction-adjusting buckle is in a fan-shaped structure and is rotationally connected to the shell through the rotating shaft, the direction-adjusting buckle is provided with an arc part and a tip part which are arranged in a back-to-back mode, and the rotating radius of the arc part rotating around the rotating shaft is larger than the distance from the tip part to the rotating shaft.

Optionally, the wire pressing assembly further includes a vertical plate and a locking member, and the locking member is capable of being switched between a locking position and an unlocking position; the first side wall of the line pressing barrel along the axial direction is arranged on the vertical plate, and one end of the pressing plate is hinged to the vertical plate;

when the retaining member is in the locking position, the other end of the pressing plate is locked on the second side wall of the pressing wire barrel along the axial direction, so that: the clamp plate compresses tightly with the circumference lateral wall of line ball section of thick bamboo towards the lateral wall of line ball section of thick bamboo in order to fix the stay cord that awaits measuring.

According to the embodiment of the invention, the to-be-measured pull rope can be pressed by the wire pressing assembly in the testing process to be always in the tensioning state, so that the to-be-measured pull rope can be effectively prevented from sliding during force measurement, and the measuring precision is further influenced.

Optionally, the locking member is a snap fastener, the snap fastener including a fastener body having a spring and a fastener head;

The hasp head is located the other end of clamp plate, and the hasp main part is located the line ball section of thick bamboo and follows axial second lateral wall.

Optionally, the at least one fixed pulley comprises two fixed pulley blocks, each fixed pulley block comprises at least one fixed pulley, one fixed pulley block of the two fixed pulley blocks is fixed at the top end of the vertical support, and the other fixed pulley block is fixed at the bottom end of the vertical support.

Alternatively, the relationship between the driving force generated by the driving member and the target force measurement value can be calculated by the following formula:

wherein F1 is a force measurement target value, F2 is a human force value number, l ₂ is the length of a handle rocker, l ₁ is the radius of a winding wheel, and n is the number of winding wires on a movable pulley in a pulley assembly.

The invention also provides a using method of the force measuring device for the pull rope, which adopts the force measuring device for the pull rope, which is related to the embodiments and possible implementation modes, to measure the force of the pull rope to be measured; the using method comprises the following steps:

Step S1: one end of a pull rope to be tested is hooked on a tension meter, and the other end of the pull rope is wound on a wire pressing cylinder;

step S2: pressing a pressing plate in the pressing line assembly on the pressing line barrel, and operating the locking piece to enable the locking piece to be in a locking position;

step S3: the direction adjusting buckle is adjusted to a first position, and the handle rocker is rotated to enable the tension meter to slide along the guide rail until the pull rope to be tested is in a tensioning state;

Step S4: continuously rotating the handle rocker, and according to the tooth pitch stepping mode, until the display value of the tension meter reaches the target force measurement value;

Step S5: and adjusting the locking piece to an unlocking position, adjusting the direction adjusting buckle to a second position, rotating the handle rocker to reset the tension meter to an initial position, and completing force measurement.

Drawings

FIG. 1 is a schematic perspective view of a force measuring device for a pull rope according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a second perspective structure of a force measuring device for a pull rope according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a vertical support, pulley assembly and tension meter according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a pulley assembly according to an embodiment of the present invention;

FIGS. 5 a-5 d are schematic structural views of a pulley assembly according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a driving member according to an embodiment of the present invention;

fig. 7 is a schematic three-dimensional structure of a pull rope force applying device according to an embodiment of the present invention, wherein a driving member is a motor;

FIG. 8 is a schematic cross-sectional view of a ratchet mechanism in a driver according to an embodiment of the present invention;

Fig. 9 is a schematic perspective view of a first view of a wire pressing assembly according to an embodiment of the present invention;

Fig. 10 is a schematic perspective view of a second view of the wire pressing assembly according to an embodiment of the invention.

Reference numerals illustrate:

1: force measuring device for pull rope;

11: a vertical support; 110: a base; 12: a pulley assembly; 121: a movable pulley; 122: a fixed pulley; 123: a pulley wire; 13: a tension meter; 130: a pull ring; 131: mounting metal plates;

14: a driving member; 141: a reel; 142: a ratchet mechanism; 142A: a ratchet cavity; 142B: a pawl cavity; 1420: a housing; 1421: a first pawl; 1422: a second pawl; 1423: a ratchet wheel; 1424: a direction-adjusting buckle; 1425: a rotating shaft; 1426: an arc part; 1427: a tip portion; 1428: a first elastic member; 1429: a second elastic member; 143: a mounting table; 144: a handle rocker; 145: a motor;

15: a slide rail assembly; 151: a guide rail; 152: a slide block; 153: a first limiting member; 154: a second limiting piece;

16: a wire pressing assembly; 161: a vertical plate; 162: a wire pressing cylinder; 163: a pressing plate; 164: a locking member; 1641: a buckle body.

Detailed Description

The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.

It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present invention.

The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 to 3, the present invention provides a force measuring device 1 for a pull rope, which specifically includes a vertical bracket 11, a pulley assembly 12, a tension meter 13, a driving member 14, and a sliding rail assembly 15 (including a guide rail 151 and a sliding block 152), wherein the guide rail 151 is mounted on the vertical bracket 11, the sliding block 152 is mounted on the guide rail 151 and can slide along the guide rail 151, and the tension meter 13 is connected to the sliding block 152 so as to slide along the sliding block 152. In one embodiment, as shown in fig. 1, the tension meter 13 is connected to the slider 152 by a mounting sheet metal 131.

Referring to fig. 4, and as will be understood with reference to fig. 1 and 2, the pulley assembly 12 includes at least one fixed pulley 122, at least one movable pulley 121, and a pulley wire 123, wherein the at least one movable pulley 121 is mounted on the slider 152 to slide along with the slider 152, at least a portion of the at least one fixed pulley 122 is fixed on the top end of the vertical support 11, one end of the pulley wire 123 is fixed on the vertical support 11, the other end of the pulley wire 123 is fixed on the driving member 14, and a portion of the pulley wire 123 is wound around the at least one fixed pulley 122 and the at least one movable pulley 121 such that: the tension meter 13 can slide along the guide rail 151 by being driven by the driving member 14 through the pulley assembly 12; when measuring force, one end of the pull rope to be measured is connected to the pull ring 130 (shown in fig. 3) of the tension meter 13.

In an exemplary embodiment, as shown in fig. 1, a first limiting member 153 and a second limiting member 154 are respectively disposed at two ends of the guide rail 151, so that the sliding block 152 slides between the first limiting member 153 and the second limiting member 154, so as to avoid the over-travel of the tension meter 13 during the vertical sliding process of the sliding block 152 on the guide rail 151.

In one embodiment, the force measuring device 1 for pulling rope further comprises a base 110 connected to the bottom of the vertical support 11, and as shown in fig. 1 and 2, the vertical support 11 and the base 110 form a structure as a support of the force measuring device 1 for pulling rope. Further, the pulley assembly 12 may have various combinations, and in one embodiment, as shown in fig. 4, the number of fixed pulleys 122 is three, two fixed to the top end of the vertical support 11 (for example, the position is higher than the upper end of the guide rail 151), the other fixed to the base 110, the number of movable pulleys 121 is one, one end of the pulley wire 123 is fixed to the vertical support 11 (for example, the position of the vertical support is a support section above the guide rail 151), and sequentially wound around the movable pulleys 121, two fixed pulleys 122 fixed to the top of the vertical support 11 and the fixed pulleys 122 fixed to the base 110, and the other end is connected to the driving member 14. In other alternative embodiments, the number of fixed pulleys 122 and movable pulleys 121 may be other numbers, for example, as shown in fig. 5a, the number of fixed pulleys 122 and movable pulleys 121 is one, for example, as shown in fig. 5b, the number of fixed pulleys 122 is two, vertically arranged and connected to the top of the vertical support 11, the number of movable pulleys 121 is one, for example, as shown in fig. 5c, the number of fixed pulleys 122 and movable pulleys 121 is two, two fixed pulleys 122 are vertically arranged and connected to the top of the vertical support 11, and two movable pulleys 121 are vertically arranged and connected together. In other examples, as shown in fig. 5d, the number of fixed pulleys 122 may be five, wherein two fixed pulleys 122 are horizontally arranged and connected to the top of the vertical support 11, the other two fixed pulleys 122 are vertically arranged and connected to any one of the two fixed pulleys 122 horizontally arranged, the other one fixed pulley 122 is fixed to the base 110, and the number of movable pulleys 121 may be two and vertically arranged. Those skilled in the art will appreciate that the number and arrangement of the pulleys in the pulley assembly 12 may be as desired. And then, the process is performed. With the pulley assembly 12, the relationship between the driving force generated by the driving member 14 and the target force measurement value can be calculated by the following formula:

wherein F1 is a force measurement target value, F2 is a human force value number, l ₂ is the length of a handle rocker, l ₁ is the radius of a winding wheel, and n is the number of winding wires on a movable pulley in a pulley assembly.

According to the invention, through the cooperation of the pulley assembly 12 and the driving piece 14, compared with the traditional force measuring device, a larger force value can be achieved under the condition of outputting smaller force, the force measuring device meets the force measuring requirement of a larger target value, is more suitable for batch force measurement, and is beneficial to improving the force measuring scale.

In one embodiment, as shown in fig. 1, the driving member 14 is a manual structure including a reel 141 and a handle rocker 144. The force measuring device 1 for the pull rope further comprises a wire pressing component 16, the other end of the pulley wire 123 is connected to the reel 141, a part of the wire segment of the pulley wire 123 is wound on the reel 141, and the handle rocker 144 is connected to the wheel shaft of the reel 141 so as to drive the reel 141 to rotate around the wheel shaft;

As will be understood from fig. 9, the wire pressing assembly 16 includes a wire pressing drum 162 and a pressing plate 163, the pressing plate 163 can be attached to a circumferential side wall of the wire pressing drum 162, and when force is measured, a part of a rope portion of the to-be-measured pull rope is wound around and clamped between the wire pressing drum 162 and the pressing plate 163.

According to the embodiment of the application, the pulley wire 123 is wound on the reel 141, so that the friction force of the pulley wire 123 on the reel 141 can be greatly increased, the stability and accuracy of the pulley assembly in the running process are greatly increased, the pull rope to be measured is clamped and fixed through the wire pressing assembly 16 in the force measuring process, and the pull rope to be measured is wound on the wire pressing barrel 162 to further increase the friction force, so that the movement and deflection of the pull rope to be measured when being stressed can be avoided.

Further, the driver 14 includes a ratchet mechanism 142 and a mounting table 143.

The reel 141 is located at the lower side of the mounting table 143, the ratchet mechanism 142 is mounted at the side of the mounting table 143 far away from the reel 141, and the wheel axle of the reel 141 passes through the ratchet mechanism 142 and is connected to the handle rocker 144 to be driven by the handle rocker 144 to rotate counterclockwise or clockwise; a partial segment of the pulley wire 123 is wound around the reel 141 and the other end of the pulley wire 123 is fixed to the reel 141. Wherein, as shown in fig. 6, the axle of the reel 141 is parallel to the rail 151, and in other alternative embodiments, the axle of the reel 141 is perpendicular to the rail 151. In other alternative embodiments, the driving member 14 may be an electric structure, as shown in fig. 7, where the driving member 14 includes a reel 141, a mounting table 143, and a motor 145, the motor 145 and the reel 141 are located on two sides of the mounting table 143, respectively, and an axle of the reel 141 is connected to a rotating shaft of the motor 145 to be driven by the motor 145.

Specifically, as shown in FIG. 8, the ratchet mechanism 142 includes a housing 1420, a ratchet 1423, a first pawl 1421, a second pawl 1422, and a steering buckle 1424. Wherein, the housing 1420 has a ratchet cavity 142A and a pawl cavity 142B which are mutually communicated, a ratchet 1423 is arranged in the ratchet cavity 142A, a first pawl 1421 and a second pawl 1422 are positioned in the pawl cavity 142B, a rotating part of the first pawl 1421 and a rotating part of the second pawl 1422 are abutted against the inner wall of the housing 1420, and a direction-adjusting buckle 1424 is positioned between the first pawl 1421 and the second pawl 1422;

The steering button 1424 is capable of switching between a first position in which the engagement portion of the first pawl 1421 engages the ratchet wheel 1423 and the second pawl 1422 does not engage the ratchet wheel 1423, and a second position in which the engagement portion of the second pawl 1422 engages the ratchet wheel 1423 and the first pawl 1421 does not engage the ratchet wheel 1423. Or can be understood as: the lower end of the wheel axle of the reel 141 is fixed, the upper end passes through the ratchet mechanism 142 and then is connected with the handle rocker 144, and the handle rocker 144 can drive the reel 141 to rotate forward and backward and is locked by the ratchet mechanism 142. The other end of the pulley wire 123 is wound around the reel 141 after being wound around the fixed pulley 122, and is fixed after being wound around the reel 141 for several turns (the winding length exceeds the slider stroke).

It can be seen that the embodiment of the present invention can achieve bidirectional winding (counterclockwise or clockwise) and self-locking of the pulley wire 123 through the ratchet mechanism 142, and the cooperation of the ratchet 1423, the pawl (including the first pawl 1421 and the second pawl 1422) and the direction-adjusting buckle 1424 enables the whole pulley assembly 12 to have better self-locking performance, so that the target force value can be maintained for a long time without additional manual control, and the accuracy of force measurement is improved.

Further, as shown in fig. 8, in one embodiment, the ratchet mechanism 142 further includes a first elastic member 1428 and a second elastic member 1429, the first elastic member 1428 is disposed between the inner wall of the housing 1420 and the first pawl 1421, and the second elastic member 1429 is disposed between the inner wall of the housing 1420 and the second pawl 1422. In one embodiment, as shown in fig. 8, the steering buckle 1424 has a fan-shaped structure, the steering buckle 1424 is rotatably connected to the housing 1420 through a rotation shaft 1425, and the steering buckle 1424 has a circular arc portion 1426 and a tip portion 1427 that are disposed opposite to each other, where a rotation radius of the circular arc portion 1426 rotating around the rotation shaft 1425 is greater than a distance from the tip portion 1427 to the rotation shaft 1425.

Or can be understood as: the two pawls (i.e., the first pawl 1421 and the second pawl 1422) form a lever structure by a first elastic member 1428 (e.g., a spring) and a second elastic member 1429 (e.g., a spring), and when the steering button 1424 is shifted to one side, the one side pawl is engaged with the ratchet 1423, and the other side spring is compressed, so that the pawl portion is separated from the ratchet. The engaged pawl wedges itself into the ratchet in one direction and slides freely in the other direction, thereby ensuring a one-way tightening lock, as will be appreciated by those skilled in the art, the radius of the ratchet 1423 and the number of ratchet teeth on the surface can be configured according to the tightening accuracy required by the force measurement, as the invention is not limited in this regard.

In one embodiment, the distance of the corresponding pulley line of the ratchet wheel traveling one tooth is reduced by the pulley block, the tension meter only travels by one n times of the distance, and the tension value is measured by adopting a stepping thought, so that the manual operation output force value can also be circulated regularly, and if the step length is further reduced, the force value output can be more accurate.

Further, as shown in fig. 9 and 10, the wire pressing assembly 16 includes a vertical plate 161, a wire pressing cylinder 162, a pressing plate 163, and a locking member 164, the locking member 164 being switchable between a locking position and an unlocking position; the platen 162 is mounted to the vertical plate 161 along a first axial sidewall, and one end of the platen 163 is hinged to the vertical plate 161. When the locking member 164 is in the locking position, the other end of the pressing plate 163 is locked to the second axial side wall of the pressing cylinder 162, and the side wall of the pressing plate 163 facing the pressing cylinder 162 is attached to the circumferential side wall of the pressing cylinder 162. When measuring force, at least part of the pull rope to be measured is positioned between the pressing plate 163 and the circumferential side wall of the wire pressing cylinder 162. Specifically, the pull rope to be measured is wound on the wire pressing cylinder for 3-5 circles and then is clamped between the pressing plate 153 and the wire pressing cylinder 162. In one embodiment, retaining member 164 is a snap fastener comprising a fastener body 1641 with a spring and a fastener head (not shown); specifically, a snap (not shown) is disposed at the other end of the pressing plate 163, and a snap body 1641 is disposed on the second axial side wall of the pressing barrel 162.

In an exemplary embodiment, the vertical plate 161 is in an i shape, the i-shaped vertical plate 161 is fixedly installed on the base 110, one side surface of the wire pressing cylinder 162 is installed on the upper portion of the vertical plate 161, one end of the pressing plate 163 is hinged to the vertical plate 161, the other end surface of the pressing plate is provided with a hasp head of a snap fastener, the other side surface of the wire pressing cylinder 162 is provided with a hasp main body 1641 matched with the hasp head, when the snap fastener is buckled, the optimal force rubber surface of the pressing plate 163 is tightly attached to the wire pressing cylinder 162, and the pretightening force is provided by the snap fastener, in addition, the higher friction force can be improved by a mode of increasing the surface roughness of the wire pressing cylinder 162 (such as arranging a plurality of micro protrusions or polishing treatment), so that the wire clamping clamp is tighter, and the stay rope to be detected during force measurement is prevented from sliding.

In addition, as the traditional tension testing device is a wire clamping mechanism, two ends of a to-be-tested pull rope are clamped and then tension testing is carried out, loss is caused on the surface of the to-be-tested pull rope at the clamped place, and in the embodiment of the invention, the radius of the wire pressing cylinder is far larger than that of a steel wire rope bending sheet metal, and bending loss is not caused on the steel wire rope; another benefit of the wire pressing assembly is that the tightening force provided to the pull cord to be tested is much greater than that provided by the wire clamping mechanism. For example, the fastening force of the pull rope to be tested is friction force f, and in the wire clamping mechanism, the maximum static friction force is approximately equal to dynamic friction force f=un, wherein the source of the pressure N is only the pretightening force of the screw. But in the embodiments of the present invention. In the line ball subassembly, after the stay cord that awaits measuring twines several circles, the summation of each circle frictional force equals the pulling force, and pressure N and pulling force have certain positive correlation, and the clamp plate compresses tightly in addition and guarantees that the stay cord end that awaits measuring can not slide simultaneously also can provide certain pressure.

The friction force exists between each circle of the pull rope (such as a steel wire rope) to be tested and the winding reel, the friction force is determined by positive pressure, the steel wire rope is pulled open, the sum of the friction force of each circle of the steel wire rope is overcome, and although the friction force of a single circle of the steel wire rope is usually not large, the friction force is several times of that of a plurality of circles. And the line pressing component is used for pressing the pull rope to be tested on the line pressing barrel, so that positive pressure is increased. In addition, the pull rope to be tested is wound on the wire pressing cylinder, and the component force of the pull force in the radial direction is provided for the pressure between the pull rope to be tested and the wire pressing cylinder, so that when the total pull force is increased, the pressure between the pull rope to be tested and the wire pressing cylinder is also increased, and then the maximum static friction force is synchronously increased. In general, the friction is proportional to the magnitude of the pulling force and exponentially related to the total number of windings. Under certain parameter conditions, the relative sliding can not occur even if the tensile force is larger, and the self-locking, namely the tension locking, occurs.

Therefore, the embodiment of the invention can compress the pull rope to be tested through the wire pressing assembly 16 in the test process so that the pull rope to be tested is always in a tensioning state, and the pull rope to be tested is prevented from sliding during force measurement, thereby affecting the measurement accuracy.

The invention also provides a use method of the force measuring device for the pull rope, which comprises the following steps:

Step S1: one end of a pull rope to be tested is hooked on a tension meter, and the other end of the pull rope is wound on a wire pressing cylinder;

step S2: pressing a pressing plate in the pressing line assembly on the pressing line barrel, and operating the locking piece to enable the locking piece to be in a locking position;

step S3: the direction adjusting buckle is adjusted to a first position, and the handle rocker is rotated to enable the tension meter to slide along the guide rail until the pull rope to be tested is in a tensioning state;

Step S4: continuously rotating the handle rocker, and according to the tooth pitch stepping mode, until the display value of the tension meter reaches the target force measurement value;

Step S5: and adjusting the locking piece to an unlocking position, adjusting the direction adjusting buckle to a second position, rotating the handle rocker to reset the tension meter to an initial position, and completing force measurement.

The following is a specific description of a method for using the force measuring device for a pull rope according to an embodiment of the present invention:

before the force measurement, all the components are connected, after the connection is completed, the pulley wire is in a loose state, and the sliding block on the guide rail is in a lower limit position. At the moment, the handle rocker is rotated to tighten the pulley wire, and the sliding block is lifted. Even after the handle rocker is released, the ratchet wheel is tightly propped by the pawl meshed in the ratchet mechanism, the handle rocker cannot loosen, the pulley wire can be tensioned, and the parts on the guide rail cannot slide downwards due to gravity. The handle rocker can be continuously rotated, the tension meter on the guide rail is adjusted to an ideal position, and the initial setting of the device is completed.

When the force is measured, firstly, when the pulling force test is needed to be carried out on the pulling rope (such as the steel wire rope of the pulling rope sensor), the steel wire rope of the pulling rope sensor is pulled out and wound on the winding drum in the line pressing assembly for 3-5 circles (actually, the steel wire rope of the pulling rope sensor can be pulled on the winding drum in the line pressing assembly for corresponding circles according to the required test force value), and the pull ring on the steel wire rope is hung on the pull ring of the tension meter. Then pressing the pressing plate in the line pressing assembly onto the winding drum, pressing the steel wire rope on the surface of the winding drum by a spring hasp buckling pressing plate, adjusting the buckle to a first position, rotating a handle rocker, enabling the tension meter to slide upwards along the guide rail along with the sliding block, gradually tensioning the steel wire rope of the pull rope sensor, continuously rotating the handle rocker tooth by tooth until the tension meter displays a target force value and is stable, releasing the handle rocker, opening the spring hasp after a certain time is stopped according to the test requirement, loosening the steel wire rope, finally, adjusting the buckle to a second position opposite to the buckle, rotating the handle rocker to adjust the tension meter to an initial position, and adjusting the pull meter to the buckle to complete the tension test.

Compared with the traditional tension testing device, the tension testing device for the pull rope combines the principle of labor saving of the movable pulley on the basis of the lever principle, simultaneously utilizes the principle of reverse rotation of the ratchet mechanism, rotates the handle rocker, drives the ratchet to move forwards, and moves a corresponding distance once every time until the pull rope to be tested is tensioned and reaches a target force value, and is very labor-saving and very accurate.

The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (10)

1. The force measuring device for the pull rope is characterized by comprising a vertical bracket, a pulley assembly, a tension meter, a driving piece and a sliding rail assembly; the sliding rail assembly comprises a guide rail and a sliding block, the guide rail is arranged on the vertical support, the sliding block is arranged on the guide rail and can slide along the guide rail, and the tension meter is connected with the sliding block so as to slide along the sliding block;

The pulley assembly comprises at least one fixed pulley, at least one movable pulley and a pulley wire, wherein the at least one movable pulley is mounted on the sliding block so as to slide along the sliding block, at least part of the at least one fixed pulley is fixed on the top end of the vertical support, one end of the pulley wire is fixed on the vertical support, the other end of the pulley wire is fixed on the driving piece, and part of the pulley wire is wound on the at least one fixed pulley and the at least one movable pulley, so that: the tension meter can slide along the guide rail through the pulley assembly driven by the driving piece;

When measuring force, one end of the pull rope to be measured is connected with the pull ring of the tension meter.

2. The force measuring device for a pull cord of claim 1, further comprising a wire pressing assembly, the drive including a reel and a handle rocker;

The other end of the pulley wire is connected with the reel, a part of line segment of the pulley wire is wound on the reel, and the handle rocker is connected with the wheel shaft of the reel so as to drive the reel to rotate around the wheel shaft;

The wire pressing assembly comprises a wire pressing barrel and a pressing plate, the pressing plate can be attached to the circumferential side wall of the wire pressing barrel, and when force is measured, part of a rope portion of a to-be-measured pull rope is wound and clamped and pressed between the wire pressing barrel and the pressing plate.

3. The force measuring device for a pull cord according to claim 2, wherein the driving member further comprises a ratchet mechanism and a mount;

The reel is located the downside of mount table, ratchet install in the mount table keep away from the side of reel, the shaft of reel pass ratchet and connect in the handle rocker to by the step-by-step rotation of anticlockwise or clockwise according to the pitch is pressed to the handle rocker drive.

4. A force measuring device for a pull cord according to claim 3, wherein the ratchet mechanism comprises a housing, a ratchet, a first pawl, a second pawl, and a steering button;

The ratchet wheel is arranged in the ratchet wheel cavity, the first pawl and the second pawl are positioned in the pawl cavity, the rotating part of the first pawl and the rotating part of the second pawl are respectively and rotatably connected to the inner wall of the shell, and the direction-adjusting buckle is positioned between the first pawl and the second pawl;

The steering button is switchable between a first position and a second position, when the steering button is in the first position, the engagement portion of the first pawl engages the ratchet wheel and the second pawl does not engage the ratchet wheel, when the steering button is in the second position, the engagement portion of the second pawl engages the ratchet wheel and the first pawl does not engage the ratchet wheel, such that: the ratchet wheel can only rotate in one direction.

5. The force measuring device for a pull cord according to claim 4, wherein the ratchet mechanism further comprises a first elastic member and a second elastic member, the first elastic member being provided between an inner wall of the housing and the first pawl, the second elastic member being provided between the inner wall of the housing and the second pawl;

The direction-adjusting buckle is of a fan-shaped structure and is rotationally connected to the shell through a rotating shaft, the direction-adjusting buckle is provided with an arc portion and a tip portion which are arranged in a back-to-back mode, and the rotating radius of the arc portion, which rotates around the rotating shaft, is larger than the distance from the tip portion to the rotating shaft.

6. The force measuring device for a pull cord as claimed in claim 2, wherein the cord pressing assembly further comprises a riser and a locking member, the locking member being switchable between a locked position and an unlocked position; the first side wall of the wire pressing cylinder along the axial direction is arranged on the vertical plate, and one end of the pressing plate is hinged to the vertical plate;

When the locking piece is in a locking position, the other end of the pressing plate is locked on the second side wall of the line pressing barrel along the axial direction, so that: the pressing plate is pressed towards the side wall of the wire pressing cylinder and the circumferential side wall of the wire pressing cylinder to fix the pull rope to be tested.

7. The force measuring device for a pull cord according to claim 6, wherein the locking member is a snap fastener including a fastener body provided with a spring and a fastener head;

The hasp head is arranged at the other end of the pressing plate, and the hasp main body is arranged on the second side wall of the line pressing barrel along the axial direction.

8. The force measuring device for a pull rope according to claim 1, wherein the at least one fixed pulley comprises two fixed pulley blocks, each fixed pulley block comprises at least one fixed pulley, one fixed pulley block of the two fixed pulley blocks is fixed at the top end of the vertical support, and the other fixed pulley block is fixed at the bottom end of the vertical support.

9. The force measuring device for a pull cord according to claim 2, wherein the relation between the driving force generated by the driving member and the target force value is calculated by the following formula:

Wherein F1 is a force measurement target value, F2 is a human force value number, l ₂ is the length of the handle rocker, l ₁ is the radius of the reel, and n is the number of windings on a movable pulley in the pulley assembly.

10. A method of using the force measuring device for a pull rope, characterized in that the force measuring device for a pull rope according to any one of claims 1 to 9 is used for measuring force of the pull rope to be measured; the using method comprises the following steps:

step S1: one end of the pull rope to be tested is hooked on the tension meter, and the other end of the pull rope to be tested is wound on the wire pressing cylinder;

Step S2: pressing a pressing plate in the pressing line assembly on the pressing line cylinder, and operating a locking piece to enable the locking piece to be in a locking position;

Step S3: adjusting the direction adjusting buckle to a first position, and rotating the handle rocker to enable the tension meter to slide along the guide rail until the pull rope to be tested is in a tensioning state;

Step S4: continuing to rotate the handle rocker in a tooth pitch stepping mode until the display value of the tension meter reaches a target force measurement value;

step S5: and adjusting the locking piece to an unlocking position, adjusting the direction adjusting buckle to a second position, rotating the handle rocker to reset the tension meter to an initial position, and completing force measurement.