CN213842491U - Chain pin shaft pressing force detection equipment - Google Patents
Chain pin shaft pressing force detection equipment Download PDFInfo
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- CN213842491U CN213842491U CN202022988168.1U CN202022988168U CN213842491U CN 213842491 U CN213842491 U CN 213842491U CN 202022988168 U CN202022988168 U CN 202022988168U CN 213842491 U CN213842491 U CN 213842491U
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Abstract
The utility model relates to a chain detection technical field provides a chain pin roll extrusion force detection equipment, aim at solving current pin roll extrusion detection equipment complete equipment volume is huge, the structure is complicated, the price is expensive, use cost is higher, and use operating procedure is too loaded down with trivial details, when detecting the extrusion force of chain link, degree of automation and serialization are low, detection efficiency is also extremely slow problem, including the chain detection platform, slip table module and the back guard plate that rectangular shape frame and frame upper end arranged from front to back in proper order, place the chain that waits to detect that sets up with slip table module in parallel below the chain detection platform, the built-in pressure force detection mechanism that puts of slip table module; the pressure output detection mechanism comprises an output force cylinder base which is slidably mounted above the sliding table module, and a servo motor which is vertically arranged is mounted on the side wall of the output force cylinder base. The utility model discloses especially, be applicable to the automation of chain round pin axle, high-efficient pressure power detection, have higher social use value and application prospect.
Description
Technical Field
The utility model relates to a chain detects technical field, concretely relates to chain pin axle pushes out force check out test set.
Background
The chain is generally a metal chain ring or ring, is mainly used for mechanical transmission and traction, wherein the conveying chain is mainly a chain with a continuous flat top surface and is composed of two basic parts, namely a hinged chain plate and a pin shaft, and is mainly suitable for conveying objects. The conveying surface of the chain is flat and smooth, the friction force is small, the transition of materials among conveying lines is stable, and the chain can be used for conveying various glass bottles, PET bottles, ring-pull cans and other materials and conveying various bags. The chain can turn and climb, has high conveying speed and is suitable for conveying small articles.
The chain needs to carry out the detection of push-out force to its round pin axle after production to guarantee that the chain can not break because of the landing of round pin axle after putting into service, and then lead to the article of carrying to take place to damage. The conventional pin shaft extrusion detection equipment generally uses a universal material testing machine, the whole set of equipment is large in size, complex in structure, high in price and high in use cost, the equipment is uneconomical to equip in small and medium-sized enterprises, the universal material testing machine is excessively complex in use and operation procedures, the automation and continuity degree is low when the extrusion force of a chain link is detected, and the detection efficiency is extremely low.
The patent with publication number CN203274991U discloses a chain press force test machine, which comprises a base and a support connected with the base, wherein a link seat is arranged on the base, a cushion block is arranged on the link seat, a force measuring sensor is arranged in the link seat, the force measuring sensor is connected with a display instrument, and a power transmission device matched with the link seat is arranged on the support.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides a not enough to prior art, the utility model provides a chain round pin axle extrusion check out test set has overcome the not enough of prior art, reasonable in design, compact structure aims at solving current round pin axle extrusion check out test set volume huge, and the structure is complicated, and is expensive, and use cost is higher, and uses the operating procedure too loaded down with trivial details, when the pressure of detecting the chain link is exerted oneself, and degree of automation and serialization is low, the problem that detection efficiency is also extremely slow.
(II) technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a chain pin shaft pressing force detection device comprises a long-strip-shaped frame and a chain detection platform, a sliding table module and a rear protection plate which are sequentially arranged at the upper end of the frame from front to back, wherein a chain to be detected, which is arranged in parallel with the sliding table module, is placed below the chain detection platform, and a pressing force detection mechanism is arranged in the sliding table module;
the pressure output detection mechanism comprises an output force cylinder base which is slidably mounted above a sliding table module, a vertically arranged servo motor is mounted on the side wall of the output force cylinder base, a planetary reducer is mounted at the output end below the servo motor, an output gear is mounted at the output end of the planetary reducer and meshed with a rack on the sliding table module, a top plate which extends forwards to a chain detection platform is horizontally mounted at the upper end of the output force cylinder base, a positioning cylinder is vertically mounted on the upper side of the front end of the top plate, the telescopic end of the positioning cylinder penetrates through the top plate and is provided with a chain link positioning sleeve, and a chain link positioning head which is matched with a hinge on a chain to be detected is mounted at the lower end of the chain link positioning sleeve;
the chain pin pressing device is characterized by further comprising an extruding cylinder installed in the output force cylinder base, the telescopic end of the extruding cylinder penetrates through the front wall of the output force cylinder base and is provided with a pin ejector seat, a pressing force ejector pin used for testing the pressing force of the pin shaft on the chain to be detected is installed on the pin ejector seat, and a pressure sensor is installed between the pressing force ejector pin and a connecting portion of the pin ejector seat.
Preferably, a front positioning mechanism and a pre-tensioning mechanism for tensioning the chain to be detected are respectively arranged at two ends of the chain detection platform.
Preferably, the front positioning mechanism comprises two positioning seats which are arranged on one side of the chain detection platform in parallel, a positioning tongue for fixing the head end of the chain to be detected is arranged on one side, close to the pre-tensioning mechanism, between the two positioning seats, a moving rod is symmetrically arranged at one end, located between the two positioning seats, of the positioning tongue, and the moving rod is slidably arranged in a lifting through hole which is vertically formed in the side wall of each positioning seat.
Preferably, prestretch straining device includes the level to the screw rod that sets up, and the thread bush is equipped with the screw rod seat on the screw rod, and screw rod seat fixed mounting is in chain testing platform's upper end, and the hand wheel is installed to the one end that the screw rod deviates from preceding positioning mechanism, and the other end integrated into one piece of screw rod has the end face bearing, and the other end of end face bearing installs force transducer, and force transducer's the other end is installed and is used for the fixed terminal pulling force chain link head of waiting to detect the chain, and the overhead cover of pulling force chain link is equipped with the pulling force axle bed, and pulling force axle bed fixed mounting is in chain testing platform's upper end.
Preferably, the chain detection platform is fixedly provided with a positioning strip for positioning the front side of the chain during detection.
Preferably, a plurality of rack foot cups are installed at the lower end of the rack, and the rack foot cups are heavy-load foot cups.
Preferably, the rack is provided with a power supply case, and a power switch, a servo driver, a circuit breaker, a relay and a direct current power supply block are arranged in the power supply case.
Preferably, a laser distance sensor used for judging the position of the movable hinge roll on the chain to be detected is installed on the bottom wall of the top plate.
Preferably, the chain detection platform is provided with an industrial personal computer through a support, the industrial personal computer is provided with a touch display screen, and the industrial personal computer is provided with a buzzer, a power switch and an emergency stop button.
(III) advantageous effects
The embodiment of the utility model provides a chain round pin axle pushes away power check out test set possesses following beneficial effect:
1. through the arrangement of the pressing force detection mechanism, when the positioning cylinder reaches the positioning point, a signal is fed back to the industrial personal computer, the industrial personal computer outputs a signal to drive the pressing cylinder to move, and a pressing force thimble fixed on the pressure sensor is pushed to detect the pressing force of the chain to be detected; in the embodiment, the initial set thrust of the extrusion cylinder is 1KN, the detection duration starts to time for a fixed time after the extrusion cylinder is in place, if the pin shaft is loosened and displaced in the process, the initial set thrust of the extrusion cylinder is reduced, if the initial set thrust of the extrusion cylinder is lower than the set thrust value of an industrial personal computer, a signal is output to a buzzer, the buzzer gives an alarm, the extrusion cylinder is stopped, an operator is restarted after unqualified marking is carried out, and the detection equipment continues to detect; and if the pin shaft does not loose and displace, continuously detecting the next chain link until the whole process flow is finished.
2. Through the combined structure of the front positioning mechanism and the pre-tensioning mechanism, the positioning of the head of the chain to be detected is realized, the pre-tensioning and the tensioning of the tail of the chain to be detected are combined, the chain plate of the chain is ensured not to be damaged in the detection, loading and unloading processes, the chain to be detected is tensioned, the pre-tensioning is carried out on the chain to be detected, so that the internode gap is eliminated in the measurement process, meanwhile, the load of the chain under the load is simulated to generate the stretching effect on the hinge of the chain, the detection of the pressing force under the use environment can be closer, and the detected data have practical reference significance.
3. Through laser distance sensor's setting, the cooperation servo motor drive carries out the slip table and removes the distance and judges, and when removing pulse volume and laser distance sensor and monitoring to detect that it fixes a position to detect the chain link that detects wherein that detects the chain link positioning head just can descend and will detect the chain, guarantees accurate location and accurate detection.
4. The utility model discloses in, drive through the extrusion cylinder and press the thimble of exerting oneself, press the chain round pin axle of fixing a position and exert oneself and detect, equipment structure is reasonable, and standardized layer degree is high, and easy processing of vulnerable part and interchangeability are good, can realize the chain round pin axle by the efficient and press the automated inspection of exerting oneself and chain length.
Drawings
The above features, technical features, advantages and modes of realisation of a chain pin pressing force detection device will be further described in the following, in a clearly understandable manner, with reference to the accompanying drawings, which illustrate preferred embodiments.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of an extrusion pushing mechanism of the present invention;
fig. 3 is a schematic structural view of a pre-tensioning mechanism in the present invention;
fig. 4 is a schematic structural view of the middle chain front positioning mechanism of the present invention.
In the figure: the device comprises a rack 1, a chain detection platform 2, a rear protection plate 3, a sliding table module 4, a pressure output force detection mechanism 6, an output force cylinder base 61, a top plate 62, an extrusion cylinder 63, a pressure output force thimble 64, a positioning cylinder 65, a chain link positioning sleeve 66, a chain link positioning head 67, a servo motor 68, a planetary reducer 69, a servo control box 610, a pressure sensor 611, an industrial personal computer 7, a power supply case 8, a pre-tensioning mechanism 9, a screw 91, a hand wheel 92, a screw seat 93, an end face bearing 94, a tension chain link head 95, a tension shaft seat 96, a tension sensor 97, a front positioning mechanism 10, a positioning seat 101, a positioning tongue 102, a moving rod 103, a lifting through hole 104, a positioning strip 11, a rack foot cup 12 and a chain a to be detected.
Detailed Description
The invention will be further described with reference to the following figures 1-4 and examples:
example 1
A chain pin shaft pressing force detection device comprises a strip-shaped frame 1 and a chain detection platform 2, a sliding table module 4 and a rear protection plate 3 which are sequentially arranged from front to back at the upper end of the frame 1, wherein a chain to be detected which is arranged in parallel with the sliding table module 4 is placed below the chain detection platform 2, and a pressing force detection mechanism 6 is arranged in the sliding table module 4;
in this embodiment, as shown in fig. 1, the pressing force detection mechanism 6 includes an output force cylinder base 61 slidably mounted above the sliding table of the sliding table module 4, a vertically arranged servo motor 68 is mounted on a side wall of the output force cylinder base 61, a planetary reducer 69 is mounted at an output side below the servo motor 68, an output gear is mounted at an output end of the planetary reducer 69, the output gear is engaged with a rack on the sliding table module 4, a top plate 62 extending forward to the chain detection platform 2 is horizontally mounted at an upper end of the output force cylinder base 61, a positioning cylinder 65 is vertically mounted on an upper side of a front end of the top plate 62, a telescopic end of the positioning cylinder 65 penetrates through the top plate 62 and is mounted with a chain link positioning sleeve 66, and a chain link positioning head 67 matched with a hinge on a chain to be detected is mounted at a lower end of the chain link positioning sleeve 66;
the chain pin pressing device is characterized by further comprising a pressing cylinder 63 installed in the output force cylinder base 61, the telescopic end of the pressing cylinder 63 penetrates through the front wall of the output force cylinder base 61 and is provided with a pin base, a pressing force ejector pin 64 used for testing the pressing force of the pin shaft on the chain to be detected is installed on the pin base, and a pressure sensor 611 is installed between the pressing force ejector pin 64 and the connecting portion of the pin base.
In this embodiment, as shown in fig. 1, a front positioning mechanism 10 and a pre-tensioning mechanism 9 for tensioning a chain to be detected are respectively disposed at two ends of the chain detection platform 2;
in this embodiment, as shown in fig. 4, the front positioning mechanism 10 includes two positioning seats 101 installed in parallel on one side of the chain detecting platform 2, and one side of the two positioning seats 101 close to the pre-tensioning mechanism 9 is provided with a positioning tongue 102 for fixing the head end of the chain to be detected, and one end of the positioning tongue 102 located between the two positioning seats 101 is symmetrically provided with a moving rod 103, and the moving rod 103 is slidably installed in a lifting through hole 104 vertically formed in the side wall of the positioning seat 101, and is matched with the pre-tensioning mechanism 9 to achieve pre-tensioning and tensioning of the chain a to be detected.
In this embodiment, as shown in fig. 3, the pre-tensioning mechanism 9 includes a screw 91 horizontally disposed, a screw seat 93 is threaded on the screw 91, the screw seat 93 is fixedly mounted at the upper end of the chain detection platform 2, a hand wheel 92 is mounted at one end of the screw 91 facing away from the front positioning mechanism 10, an end face bearing 94 is integrally formed at the other end of the screw 91, a tension sensor 97 is mounted at the other end of the end face bearing 94, a tension link head 95 for fixing the tail end of the chain to be detected is mounted at the other end of the tension sensor 97, a tension shaft seat 96 is sleeved on the tension link head 95, the tension shaft seat 96 is fixedly mounted at the upper end of the chain detection platform 2, the tail end of the chain a to be detected is connected with the tension link head 95, the hand wheel 92 is rotated, the chain a to be detected is tensioned through threaded connection of the screw 91 on the screw seat 93, and the chain a to be detected is pre-tensioned, the internode clearance is eliminated during measurement, and simultaneously, the load of the chain under the load is simulated to generate the stretching effect on the chain hinge, so that the detection of the pressing force can be performed closer to the use environment, and the detected data has more practical reference significance;
in this embodiment, the pretensioning force is directly read on the display screen of the industrial personal computer 7 through the tension sensor 17, and when the pretensioning force reaches 1/3 of the tensile load, the pretensioning force is released after staying for 30 seconds.
In this embodiment, as shown in fig. 1, a positioning strip 11 is fixedly installed on the chain detection platform 2, and is used for positioning the front side of the chain during detection, and when the pressing force detection mechanism 6 works, the pitch of the chain a to be detected is measured, so that on one hand, chain length detection and front side positioning of the chain a to be detected can be performed, and on the other hand, initialization of data set by the industrial personal computer 7 is facilitated.
In this embodiment, as shown in fig. 1, a plurality of rack foot cups 12 are installed at the lower end of the rack 1, and the rack foot cups 12 are heavy-duty foot cups, so as to ensure stable support and stable detection of the detection device.
In this embodiment, as shown in fig. 1, a power supply case 8 is installed on the rack 1, a power switch, a servo driver, a circuit breaker, a relay, and a dc power supply block are installed in the power supply case 8, the power switch is used for controlling the on/off and connection of a power supply, the delayer is used for cooperating with the intermittent motion of the reduction motor 68, the circuit breaker and the relay are used for protecting the safety of a circuit, and the dc power supply block is used for current transmission of each electrical component of the equipment, so that the maintenance is facilitated.
In this embodiment, a laser distance sensor for determining the position of the movable hinge roll on the chain a to be detected is installed on the bottom wall of the top plate 62, the moving distance of the output force cylinder base 61 is determined under the driving of the reduction motor 68, and when the moving pulse quantity and the laser distance sensor monitor that the hinge roll of the chain a to be detected meets the requirement at the same time, the link positioning head 67 will descend to position the link of the chain a to be detected therein.
In this embodiment, as shown in fig. 1, install industrial computer 7 through the support on the chain testing platform 2, be equipped with touch display screen on the industrial computer 7, and be provided with bee calling organ, switch, scram button on the industrial computer 7, industrial computer 7 is connected with extrusion cylinder 63, location cylinder 65, gear motor 68, servo control box 610, pressure sensor 611, force sensor 97 and lift cylinder respectively through electric control line, industrial computer 7 is used for coordinating each mechanism coordinated operation of control, and the detection of waiting to detect chain a extrusion force is detected in automatic realization.
In the embodiment, when the positioning cylinder 65 reaches the positioning point, a signal is fed back to the industrial personal computer 7, the industrial personal computer 7 outputs a signal to drive the extruding cylinder 63 to move, and the extruding force thimble 64 fixed on the pressure sensor 611 is pushed to detect the extruding force of the chain a to be detected; in the embodiment, the initial set thrust of the extrusion cylinder 63 is 1KN, the detection duration is 1S from the time when the extrusion cylinder 63 is in place, and the detection duration can be modified on a touch display screen on the industrial personal computer 7 according to actual requirements, in the process, if the pin shaft looses and displaces, the initial set thrust of the extrusion cylinder 63 is reduced, if the initial set thrust is lower than the set thrust value of the industrial personal computer 7, a signal is output to a buzzer, the buzzer gives an alarm, the machine is stopped, the operation personnel is restarted after unqualified marking, and the detection equipment continues to detect; and if the pin shaft does not loose and displace, continuously detecting the next chain link until the whole process flow is finished.
Example 2
The embodiment also provides an operation method based on the chain pin shaft pressing force detection device, which comprises the following steps:
s1, placing the chain to be detected on the upper end of the chain detection platform 2, connecting and fixing the head end of the product to be detected with the positioning tongue 102, connecting the tail end of the product to be detected with the tension chain link head 95, rotating the hand wheel 92, connecting the screw rod 91 on the screw rod seat 93 through threads, tensioning the chain to be detected, and pre-tensioning the chain to be detected;
s2, the industrial personal computer 7 starts the pressing force detection mechanism 6, the servo motor 68 is meshed with a rack on the sliding table module 4 after being decelerated through the planetary reducer 69, the output force cylinder base 61 is driven to intermittently move along the sliding table module 4 according to a set pulse quantity distance, the laser distance sensor detects a movable hinge roll of a chain to be detected at the same time, the output force cylinder base 61 stops moving, and the positioning cylinder 65 drives the chain link positioning head 24 on the chain link positioning sleeve 23 to move downwards and guides and positions a fixed hinge roll of the chain to be detected;
s3, the extrusion cylinder 63 drives the extrusion force thimble 64 to move forwards, the front end of the extrusion force thimble 64 pushes the pin shaft of the chain to be detected, the extrusion force detection is carried out by matching with the pressure sensor 611, the extrusion cylinder 63 initially sets the thrust to be 1KN, the detection time starts to time for 1S after the extrusion cylinder 63 is in place, if the pin shaft loosens and displaces in the process, the initially set thrust of the cylinder is reduced, and if the initially set thrust of the cylinder is lower than the set thrust value of an industrial personal computer, a signal is output to a buzzer, the buzzer gives an alarm and controls the shutdown, the operation personnel restarts after unqualified marking, and the detection device continues to detect; if the pin shaft does not loose and move, the next chain link is continuously detected until all pin shaft detection process flows are finished
The embodiment of the present invention discloses a preferred embodiment, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention according to the above embodiment, and make different extensions and changes, but do not depart from the spirit of the present invention, all of which are within the protection scope of the present invention.
Claims (9)
1. The chain pin shaft pressing force detection equipment comprises a strip-shaped rack (1) and a chain detection platform (2), a sliding table module (4) and a rear protection plate (3) which are sequentially arranged from front to back at the upper end of the rack (1), and is characterized in that a chain to be detected, which is arranged in parallel with the sliding table module (4), is placed below the chain detection platform (2), and a pressing force detection mechanism (6) is arranged in the sliding table module (4);
the pressure output detection mechanism (6) comprises an output force cylinder base (61) which is slidably arranged above the sliding table of the sliding table module (4), a servo motor (68) which is vertically arranged is arranged on the side wall of the output force cylinder base (61), a planetary reducer (69) is output and arranged below the servo motor (68), an output gear is arranged at the output end of the planetary reducer (69), and the output gear is meshed with the rack on the sliding table module (4), the upper end of the output force cylinder base (61) is horizontally provided with a top plate (62) which extends forwards to the chain detection platform (2), a positioning cylinder (65) is vertically arranged on the upper side of the front end of the top plate (62), the telescopic end of the positioning cylinder (65) penetrates through the top plate (62) and is provided with a chain link positioning sleeve (66), and the lower end of the chain link positioning sleeve (66) is provided with a chain link positioning head (67) matched with a hinged roll on a chain to be detected;
the chain pin pushing device is characterized by further comprising an extruding cylinder (63) installed in the output force cylinder base (61), the telescopic end of the extruding cylinder (63) penetrates through the front wall of the output force cylinder base (61) and is provided with a pin base, a pressure output ejector pin (64) used for testing the pressure output of the pin shaft on the chain to be detected is installed on the pin base, and a pressure sensor (611) is installed between the pressure output ejector pin (64) and the connecting portion of the pin base.
2. The chain pin extrusion force detection device of claim 1, wherein: and a front positioning mechanism (10) and a pre-tensioning mechanism (9) for tensioning the chain to be detected are respectively arranged at two ends of the chain detection platform (2).
3. The chain pin extrusion force detection device of claim 2, wherein: the front positioning mechanism (10) comprises two positioning seats (101) which are arranged on one side of the chain detection platform (2) in parallel, a positioning tongue (102) used for fixing the head end of the chain to be detected is arranged on one side, close to the pre-tensioning mechanism (9), between the two positioning seats (101), a moving rod (103) is symmetrically arranged at one end, located between the two positioning seats (101), of the positioning tongue (102), and the moving rod (103) is slidably arranged in a lifting through hole (104) which is vertically formed in the side wall of the positioning seat (101).
4. The chain pin extrusion force detection device of claim 2, wherein: prestretch straining device (9) including level to screw rod (91) that sets up, threaded sleeve is equipped with screw rod seat (93) on screw rod (91), and screw rod seat (93) fixed mounting is in the upper end of chain testing platform (2), hand wheel (92) are installed to the one end that screw rod (91) deviate from preceding positioning mechanism (10), the other end integrated into one piece of screw rod (91) has end face bearing (94), and end face bearing's (94) the other end installs tension sensor (97), tension sensor's (97) the other end is installed and is used for the fixed terminal pulling force link head (95) of waiting to detect the chain, the cover is equipped with pulling force axle bed (96) on pulling force link head (95), and pulling force axle bed (96) fixed mounting is in the upper end of chain testing platform (2).
5. The chain pin extrusion force detection device of claim 1, wherein: and a positioning strip (11) is fixedly mounted on the chain detection platform (2) and used for positioning the front side of the chain during detection.
6. The chain pin extrusion force detection device of claim 1, wherein: a plurality of rack foot cups (12) are installed to the lower extreme of frame (1), and rack foot cup (12) are heavy load foot cup.
7. The chain pin extrusion force detection device of claim 1, wherein: a power supply case (8) is installed on the rack (1), and a power switch, a servo driver, a circuit breaker, a relay and a direct-current power supply block are arranged in the power supply case (8).
8. The chain pin extrusion force detection device of claim 1, wherein: and a laser distance sensor for judging the position of the movable hinge on the chain (a) to be detected is arranged on the bottom wall of the top plate (62).
9. The chain pin extrusion force detection device of claim 1, wherein: the chain detection platform (2) is provided with an industrial personal computer (7) through a support, the industrial personal computer (7) is provided with a touch display screen, and the industrial personal computer (7) is provided with a buzzer, a power switch and an emergency stop button.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022988168.1U CN213842491U (en) | 2020-12-09 | 2020-12-09 | Chain pin shaft pressing force detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022988168.1U CN213842491U (en) | 2020-12-09 | 2020-12-09 | Chain pin shaft pressing force detection equipment |
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| CN213842491U true CN213842491U (en) | 2021-07-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115077896A (en) * | 2022-08-23 | 2022-09-20 | 邢台军华机械科技有限公司 | Pin shaft pressing force detection equipment for chain detection and operation method thereof |
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2020
- 2020-12-09 CN CN202022988168.1U patent/CN213842491U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115077896A (en) * | 2022-08-23 | 2022-09-20 | 邢台军华机械科技有限公司 | Pin shaft pressing force detection equipment for chain detection and operation method thereof |
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