CN110648581A - Manual type plane cam profile acquisition experiment teaching device and experiment method - Google Patents
Manual type plane cam profile acquisition experiment teaching device and experiment method Download PDFInfo
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- CN110648581A CN110648581A CN201910986134.8A CN201910986134A CN110648581A CN 110648581 A CN110648581 A CN 110648581A CN 201910986134 A CN201910986134 A CN 201910986134A CN 110648581 A CN110648581 A CN 110648581A
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Abstract
The invention provides a manual plane cam profile acquisition experiment teaching device and an experiment method, which can conveniently realize high-order matching between a plane cam and a driven part, conveniently replace plane cams with different profiles and driven parts of different types, adjust the offset distance of the driven part according to requirements, drive a ratchet mechanism to move in a single direction and at a fixed angle through a handle and a link mechanism to drive the cam to perform intermittent motion, realize the intermittent motion interval angle of the cam by replacing ratchets with different tooth numbers, and simultaneously change the position of a crank support in a sliding chute to ensure that the accurate intermittent angle is realized after the replacement of the ratchets. Through pointer on the cam follower and scale on the follower guide way, conveniently acquire follower displacement, this experimental apparatus can realize manual detection plane cam profile.
Description
Technical Field
The invention belongs to the technical field of mechanical principle mechanics, particularly relates to a cam mechanism, and particularly relates to a manual plane cam profile acquisition experiment teaching device and an experiment method.
Background
The cam mechanism is one of the most common mechanisms in mechanical equipment, and is widely applied to various automatic control equipment because the cam mechanism has a simple and compact structure and a driven part can realize the change of a preset rule.
The theoretical content of the cam mechanism is abstract, students can difficultly learn, and the cam mechanism is particularly designed and analyzed and is comprehensively applied.
At present, cam teaching equipment is integrated with motor drive and sensor acquisition into a whole in China, and a computer is combined for quantitative or qualitative test analysis, so that the equipment is high in comprehensiveness and helpful for students to learn and understand a cam mechanism, but the cam mechanism knowledge comprehensive utilization and design analysis of the students are flat in effect.
These cam mechanism experimental devices generally cannot change system parameters, are complex to operate and install, are heavy, and are not beneficial to being used in cam mechanism teaching experiments.
Disclosure of Invention
The invention aims to provide a brand-new manual type plane cam profile acquisition experiment teaching device aiming at the actual requirements in the current cam mechanism experiment teaching and combining the defects of the current cam teaching equipment. The device has the characteristics of light and simple structure, convenient use, flexible replacement of the experimental cam and the driven part, low cost and the like, and can well meet the requirement of acquiring profile curves of different types of disc cams in experimental teaching of the cam mechanism. The technical scheme of the invention is as follows:
the utility model provides a manual formula plane cam profile acquisition experiment teaching device which characterized in that includes following part: the device comprises an equipment base, a plurality of supporting seats, fixing bolts, an experiment cam mounting shaft, a mounting supporting plate, an experiment cam, a driven piece guide path, a reset spring, a scale pointer, a plurality of hinge bolts and locking nuts thereof, a connecting rod, a crank, a handle, a crank bracket, a rocker, a pawl, a ratchet wheel, a locking nut and a driven piece guide path set screw; the experimental cam mounting shaft is provided with a ratchet wheel positioning flat key, a ratchet wheel positioning sleeve, a bearing, an experimental cam positioning sleeve, an experimental cam positioning flat key, a mounting shaft locking nut and a pin shaft;
the equipment base and the supporting seat of the mounting support plate are positioned through dovetail grooves, rectangular grooves are formed in the supporting seat, the mounting support plate and the crank support are respectively embedded in the rectangular grooves of the supporting seat, and the mounting support plate and the crank support are fixed through fixing bolts and locking nuts; the supporting seat can manually move along the groove direction in a dovetail groove of the equipment base;
the upper part of the supporting plate is provided with a horizontal dovetail-shaped slide rail, a driven piece guide path is arranged above the slide rail, the driven piece guide path is in sliding connection with the dovetail-shaped slide rail and is locked by a driven piece guide path set screw, and the driven piece is in sliding connection with the driven piece guide path to realize the guide fit of the vertical movement of the driven piece; the return spring is arranged on the driven piece; the dial indicator is mounted in a hole on the driven member and is in contact with the lower end of the return spring;
the middle of the supporting plate is provided with a hole which is provided with a bearing, the bearing supports an experimental cam installation shaft, an experimental cam positioning sleeve and an experimental cam positioning flat key are arranged on the experimental cam installation shaft, an experimental cam is arranged on the experimental cam installation shaft and is axially positioned by the cam positioning sleeve, the cam positioning flat key is used for circumferential positioning, the tail end of the experimental cam installation shaft is circumferentially positioned and locked by an installation shaft locking nut, a ratchet wheel is simultaneously arranged on the other side of the experimental cam installation shaft and is axially positioned by the ratchet wheel positioning sleeve, the ratchet wheel positioning flat key is used for circumferential positioning, the tail end of the ratchet wheel installation side is provided with an installation shaft locking nut for axial positioning and locking of the ratchet wheel, and the experimental;
the ratchet wheel can perform unidirectional intermittent motion under the driving of the pawl, the pawl is mounted on a rocker through a hinge bolt and a hinge locking nut and forms a revolute pair with the rocker, the rocker forms a revolute pair with a connecting rod through the hinge bolt and the hinge locking nut, the connecting rod forms a revolute pair with a crank through the hinge bolt and the hinge locking nut, the crank and a handle are fixed into a component through a pin shaft in an interference fit mode, and the pin shaft is arranged in a crank support hole and forms a revolute pair with the crank.
Furthermore, the driven part guide path is provided with an upper rectangular groove part and a lower rectangular groove part, the driven part is arranged in the two rectangular grooves of the driven part guide path and is guided by the two rectangular grooves, and the upper end of the reset spring is contacted with the upper rectangular groove part.
Furthermore, scales of the lifting distance of the driven part are arranged on the driven part guide way, and/or a length scale is arranged on the installation supporting plate along the horizontal dovetail-shaped sliding rail.
The invention also provides a plane cam profile acquisition experimental method which is characterized in that any one of the plane cam profile acquisition experimental teaching instruments is adopted, and the method comprises the following steps:
installing and fixing the experimental cam, and adjusting the offset distance between the driven piece and the rotation center of the cam; secondly, adjusting the distance between the crank support and the rotation center of the cam according to the number of the ratchet teeth; then, because the angle is determined every time the handle rotates for one circle, only the corresponding displacement value of the driven part needs to be recorded, and finally, curve drawing and numerical processing are carried out to obtain the motion rule of the driven part;
the plane cam profile acquisition experiment of different driven members under the centering/biasing condition can be realized by replacing the cam, replacing the ratchet wheel, replacing the type of the driven member and moving the driven member to adjust the position of the horizontal dovetail-shaped slide rail corresponding to the upper part of the supporting plate, and the adjustment of the corresponding sampling point number in one period of the plane cam profile can be realized by moving the crank support to adjust the distance between the crank support and the center of the cam.
The novel cam mechanism experimental device provided by the invention has reasonable component configuration, can be easily disassembled without professional technology, can realize the replacement of the type of the driven part, the adjustment of the offset distance of the driven part and the replacement of the disc-shaped cam with different profiles, and meets the teaching requirements and characteristics. The dovetail groove track design can make things convenient for dismouting and distance adjustment, and ratchet combines four-bar linkage to ensure the degree of accuracy of cam corner interval, can realize cam mechanism turned angle's change through the distance of adjustment crank support. The device easy operation, cam mechanism component part change is convenient, and parameter adjustment is convenient, can satisfy different dish type cam mechanism profile measurement's experimental task, can combine the experiment teaching, and help the student understand more vividly and study relevant teaching content.
Drawings
Fig. 1, 2 and 3 are a front view, a rear view and a left view of a manual type plane cam profile acquisition experiment teaching device according to an embodiment of the invention.
Fig. 4 is a three-dimensional view of the experimental cam mounting shaft.
Fig. 5 and 6 are three-dimensional views of a roller follower and a flat bottom follower, respectively.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
A manual type plane cam profile collection experiment teaching device comprises an equipment base 1, a supporting seat 2, a fixing bolt 3, an experiment cam mounting shaft 4, a mounting supporting plate 5, an experiment cam 6, a sharp-top driven piece 7, a driven piece guide path 8, a reset spring 9, a scale pointer 10, a hinge bolt 11, a connecting rod 12, a crank 13, a handle 14, a crank support 15, a rocker 16, a pawl 17, a ratchet wheel 18, a locking nut 19, a hinge locking nut 20, a driven piece guide path fastening screw 21, a ratchet wheel positioning flat key 22 on the experiment cam mounting shaft 4, a ratchet wheel positioning sleeve 23, a bearing 24, an experiment cam positioning sleeve 25, an experiment cam positioning flat key 26, a mounting shaft locking nut 27 and a pin shaft 28;
the cavity of the lower cavity of the equipment base 1 and the supporting seat 2 are positioned through the dovetail groove, the positioning can be realized through the friction force generated by transition fit between the dovetail groove and the sliding block of the supporting seat in the groove, thus, the precision meets the teaching requirement, the operation is more convenient when the experiment parameters are adjusted, a screw hole can be formed in the bottom of the equipment base 1, and the equipment base is locked and positioned through a screw. Rectangular grooves are arranged in the supporting seat 2 for mounting the supporting plate 5 and the crank bracket 15. The mounting support plate 5 is embedded in the rectangular groove of the support seat 2 thereof, and the mounting support plate 5 is fixed by the fixing bolt 3 and the lock nut 19, and the support seat 2 of the crank bracket 15 fixedly embeds the crank bracket 15 in the rectangular groove thereof by the fixing bolt 3 and the lock nut 19. According to the experimental requirement, the supporting seat 2 can move along the groove direction manually in the dovetail groove of the equipment base 1, and the positioning is realized by using friction force.
A horizontal dovetail slide rail is arranged at the upper part of the supporting plate 5, a driven piece guide path 8 is arranged on the slide rail, the driven piece guide path 8 can horizontally move along the dovetail slide rail at the upper part of the supporting plate 5, and locked by a follower guide path set screw 21, the pinnacle follower 7 passes through two rectangular guide groove members 81 and 82 on the follower guide path 8, the vertical movement of the pinnacle driven member 7 can be realized, the reset spring 9 is arranged on the pinnacle driven member 7, the highest position is limited by an upper rectangular groove member 81 of the driven member guide path (8), the dial indicator 10 is arranged in a hole on the pinnacle driven member 7, and contacts with the lower end of the return spring 9, compresses the return spring 9 as the follower 7 moves upward, and a dial scale 80 is arranged on the right side of the driven piece guide path 8, and a dial scale pointer 10 reads the moving distance of the pinnacle driven piece 7 through the dial scale.
The centre of backup pad 5 is equipped with a hole, is equipped with bearing 24, and bearing 24 supports experiment cam installation axle 4, experiment cam installation axle 4 facial make-up experiment cam positioning sleeve 25, experiment cam location parallel key 26, and experiment cam 6 is installed on experiment cam installation axle 4, carries out axial positioning by cam positioning sleeve 25, carries out circumference location by cam location parallel key 26, and the end is carried out circumference location and locking by installation axle lock nut 27, ratchet 18 is installed simultaneously to experiment cam installation axle 4 opposite side, carries out axial positioning by ratchet positioning sleeve 23, and ratchet location parallel key 22 carries out circumference location, and ratchet 18 installation side end is equipped with installation axle lock nut 27 and carries out the axial positioning and the locking of ratchet 18, experiment cam 6 and ratchet 18 form a component.
The ratchet wheel 18 can intermittently move in a single direction under the driving of the pawl 17, the pawl 17 is mounted on a rocker 16 through a hinge bolt 11 and a hinge lock nut 20 and forms a rotating pair with the rocker 16, the rocker 16 forms a rotating pair with a connecting rod 12 through the hinge bolt 11 and the hinge lock nut 20, the connecting rod 12 forms a rotating pair with a crank 13 through the hinge bolt 11 and the hinge lock nut 20, the crank 13 and a handle 14 are fixed into a component through a pin shaft 28 and the pin shaft 28 in an interference fit mode, and the pin shaft 28 is arranged in a hole of a crank support 15 and forms a rotating pair with the crank 14.
The handle 14 rotates clockwise for a circle, the crank 13 and the connecting rod 12 drive the rocker 16 to swing back and forth once, the rocker 16 drives the ratchet 18 to rotate clockwise for an angle corresponding to the ratchet teeth through the pawl 17, and at the moment, the cam 6 rotates synchronously for the same angle along with the ratchet 18.
The driven member guide path 8 drives the pinnacle driven member 7 to move along a dovetail-shaped slide rail on the upper portion of the supporting plate 5, so that the eccentric distance of the plane cam can be adjusted, and correspondingly, a scale 50 related to the eccentric distance is arranged along the dovetail-shaped slide rail. The pointed push rod follower 7 can be replaced by a roller follower 29 and a flat bottom follower 30, the inner ring of a roller 32 on the roller follower 29 is fixed on a roller follower bracket through a pin shaft 31, and the experiment cam 6 can be replaced by an experiment flat cam through disassembling and assembling a lock nut 27.
The profile curve of the cam in the cam mechanism is closely related to the offset distance of the cam mechanism, and different cam profiles can be designed according to different offset distances and the same motion rule of the push rod. The experimental device can actively adjust the offset distance between the driven part and the center of the cam, and the eccentric distance is kept constant after the adjustment is fixed by the set screw. The offset distance in the device is adjusted in the horizontal direction through the driven part guide path 8, and a dovetail groove guide rail is adopted, so that the device has good guidance. The locking mode of the driven part guide path 8 is realized by adopting a driven part guide path set screw 21, and when the adjustment is needed, the set screw is loosened for adjustment; and after the adjustment is finished, screwing the fastening screw.
Common follower types for flat disc cam mechanisms are pointed push rods, flat push rods and roller push rods. The three types of push rods have different structures and friction conditions and are suitable for different working occasions. The cam mechanism experimental apparatus must be capable of replacing different types of followers. The experimental system adopts the double-rectangular guide path to ensure the precision requirement of the linear motion of the driven part, and the driven part is very convenient to replace. The scale pointer 10 is pulled out of the push rod, so that the driven piece and the reset spring can be detached, the other push rod is sleeved with the reset spring while being installed along the lower part of the double-rectangular guide path, finally, the reset spring is compressed upwards, the scale pointer is inserted into a hole of the push rod, the replacement is completed, the replacement time is greatly shortened, and the precision requirement of the driven piece in the running direction can be ensured in the double guide rails.
The follower displacement is read by the scale on the right side of the follower guide 8 by the scale hand 10 mounted on the pinnacle follower 7, and it is necessary to ensure that the hand side of the scale hand 10 is parallel to the scale disc when reading. The displacement range of the driven part can be adjusted by processing a plurality of mounting holes of the scale pointers 10 on the push rod of the driven part, the requirements of different experimental cam strokes are met, and the maximum displacement range is determined by the distance between two rectangular grooves on the guide path of the driven part.
The cam is used as a measured object of the experimental device, the replaceability principle is met, and the measured cam of the experimental device can be freely replaced. The relevant determining parameters of the cam profile, such as base circle radius and stroke, can be deduced through test data.
The cam motion is that after the crank rocker mechanism is driven by the handle 14 to move, the ratchet wheel is pushed by the ratchet wheel mechanism to rotate for a fixed angle, and at the moment, the experimental cam also rotates for a corresponding angle. The designed ratchet wheel has 30 ratchet teeth, one ratchet tooth records one angle and displacement per rotation, namely (theta, s), and 30 groups of data can be recorded when the experimental cam rotates once. Therefore, the lengths of all the rods of the crank rocker mechanism must meet a certain relationship, and the rod length relationship is as follows:
Δφ＝φ1-φ1≤2π/k
wherein: l1-crank length; l2-the length of the connecting rod; l3-the length of the rocker; l4Frame length (distance between crank rotation center and ratchet rotation center); k is the number of ratchet teeth; delta phi is the swing angle of the rocker.
For further fine recording, a ratchet with more ratchet teeth can be installed. In order to ensure that ratchets with different ratchet teeth can rotate the handle for one circle in the same experimental device, the ratchets rotate for an angle corresponding to one tooth, the crank support 15 is restrained with the equipment base through the dovetail groove, and therefore l can be changed by moving the crank support 154The length of the cam is adjusted to meet the requirement of the rotating angle interval of the cam.
The experimental device can realize the test of the given cam profile and the test of the motion rule of the driven part, the corner precision of the cam is guaranteed by the ratchet mechanism, the displacement of the push rod is read by manpower, the precision is limited, but the manual operation is favorable for flexibly reflecting the test process and the essence. The experimental device specifically comprises the following operation steps: firstly, installing and fixing an experimental cam 4, adjusting the offset distance between a driven piece and the rotation center of the cam, and referring to a scale 50 during adjustment; secondly, adjusting the distance between the crank support and the rotation center of the cam according to the number of the ratchet teeth; then, because the angle is determined every turn of the handle, only the corresponding displacement value of the driven part needs to be recorded, and finally, curve drawing and numerical processing are carried out to obtain the motion rule of the driven part.
The plane cam mechanism can move according to a preset rule mainly based on the contour curve of the cam, and the movement rule of the contour curve of the plane cam can be obtained by combining the rotating angle of the cam with the displacement of the push rod follower at a corresponding angle.
The plane cam profile acquisition experiment of different driven members under the centering/biasing condition can be realized by replacing the cam, replacing the ratchet wheel, replacing the type of the driven member and moving the driven member to adjust the position of the horizontal dovetail-shaped slide rail corresponding to the upper part of the supporting plate, and the adjustment of the corresponding sampling point number in one period of the plane cam profile can be realized by moving the crank support to adjust the distance between the crank support and the center of the cam.
When the device is introduced in the specification, the self-made parts are taken as examples for description. Other embodiments using common standard components and corresponding combinations to achieve the functions and purposes of the present invention are within the scope of the present invention.
Claims (4)
1. The utility model provides a manual formula plane cam profile acquisition experiment teaching device which characterized in that includes following part: the device comprises an equipment base (1), a plurality of supporting seats (2), fixing bolts (3), an experiment cam mounting shaft (4), a mounting supporting plate (5), an experiment cam (6), a driven piece guide path (8), a reset spring (9), a scale pointer (10), a plurality of hinge bolts (11), locking nuts (20) of the hinge bolts, a connecting rod (12), a crank (13), a handle (14), a crank support (15), a rocker (16), a pawl (17), a ratchet wheel (18), a locking nut (19) and a driven piece guide path set screw (21); a ratchet wheel positioning flat key (22), a ratchet wheel positioning sleeve (23), a bearing (24), an experiment cam positioning sleeve (25), an experiment cam positioning flat key (26), a mounting shaft locking nut (27) and a pin shaft (28) are arranged on the experiment cam mounting shaft (4);
the equipment base (1) and the supporting seat (2) of the mounting supporting plate (5) are positioned through dovetail grooves, rectangular grooves are formed in the supporting seat (2), the mounting supporting plate (5) and the crank bracket (15) are respectively embedded in the rectangular grooves of the supporting seat (2), and are fixed through a fixing bolt (3) and a locking nut (19); the supporting seat (2) can manually move along the groove direction in a dovetail groove of the equipment base (1);
a horizontal dovetail-shaped sliding rail is arranged at the upper part of the supporting plate (5), a driven piece guide path (8) is arranged above the sliding rail, the driven piece guide path (8) is in sliding connection with the dovetail-shaped sliding rail and is locked by a driven piece guide path set screw (21), and the driven piece (7) is in sliding connection with the driven piece guide path (8) to realize the guide matching of the vertical movement of the driven piece (7); the return spring (9) is arranged on the driven piece (8); the dial indicator (10) is mounted in a hole on the driven member (7) and is in contact with the lower end of the return spring (9);
a hole is arranged in the middle of the supporting plate (5), a bearing (24) is arranged, the bearing (24) supports the experimental cam installation shaft (4), an experimental cam positioning sleeve (25) and an experimental cam positioning flat key (26) are arranged on the experimental cam installation shaft (4), the experimental cam (6) is arranged on the experimental cam installation shaft (4), axial positioning is carried out by the cam positioning sleeve (25), circumferential positioning is carried out by the cam positioning flat key (26), circumferential positioning and locking are carried out at the tail end by an installation shaft locking nut (27), a ratchet wheel (18) is simultaneously installed on the other side of the experimental cam installation shaft (4), axial positioning is carried out through a ratchet wheel positioning sleeve (23), circumferential positioning is carried out through a ratchet wheel positioning flat key (22), an installation shaft locking nut (27) is arranged at the tail end of the installation side of the ratchet wheel (18) to carry out axial positioning and locking on the ratchet wheel (18), and the experimental cam (6) and the ratchet wheel (18) form a component;
the ratchet wheel (18) can move intermittently in a single direction under the driving of the pawl (17), the pawl (17) is installed on the rocker (16) through the hinge bolt (11) and the hinge locking nut (20) and forms a revolute pair with the rocker (16), the rocker (16) forms a revolute pair with the connecting rod (12) through the hinge bolt (11) and the hinge locking nut (20), the connecting rod (12) forms a revolute pair with the crank (13) through the hinge bolt (11) and the hinge locking nut (20), the crank (13) and the handle (14) are fixed into a component through the pin shaft (28) in an interference fit mode, and the pin shaft (18) is arranged in a hole of the crank support (15) and forms a revolute pair with the crank (14).
2. A manual type plane cam profile collection experiment teaching device according to claim 1, wherein the follower guide path (8) is provided with upper and lower rectangular groove members, the follower (7) is fitted in and guided by the two rectangular groove members of the follower guide path (8), and the upper end of the return spring (9) contacts the upper rectangular groove members.
3. A manual type plane cam profile collection experiment teaching device according to claim 1, wherein the driven member guide path (8) is provided with scales of the lifting distance of the driven member (7), and/or the mounting support plate (5) is provided with a length scale along the horizontal dovetail-shaped slide rail.
4. A plane cam profile collection experiment method, which adopts any one of the plane cam profile collection experiment teaching instruments of claims 1, 2 or 3, and comprises the following steps:
installing and fixing the experimental cam, and adjusting the offset distance between the driven piece and the rotation center of the cam; secondly, adjusting the distance between the crank support and the rotation center of the cam according to the number of the ratchet teeth; then, because the angle is determined every time the handle rotates for one circle, only the corresponding displacement value of the driven part needs to be recorded, and finally, curve drawing and numerical processing are carried out to obtain the motion rule of the driven part;
the plane cam profile acquisition experiment of different driven members under the centering/biasing condition can be realized by replacing the cam, replacing the ratchet wheel, replacing the type of the driven member and moving the driven member to adjust the position of the horizontal dovetail-shaped slide rail corresponding to the upper part of the supporting plate, and the adjustment of the corresponding sampling point number in one period of the plane cam profile can be realized by moving the crank support to adjust the distance between the crank support and the center of the cam.
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| CN201910986134.8A CN110648581A (en) | 2019-10-17 | 2019-10-17 | Manual type plane cam profile acquisition experiment teaching device and experiment method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111899626A (en) * | 2020-06-02 | 2020-11-06 | 浙大城市学院 | Multifunctional experiment teaching instrument and experiment method for disc-shaped cam mechanism of oscillating follower |
| CN111899627A (en) * | 2020-06-02 | 2020-11-06 | 浙大城市学院 | Multifunctional experimental teaching instrument of space cam mechanism |
| CN113607033A (en) * | 2021-08-02 | 2021-11-05 | 常熟纺织机械厂有限公司 | Cam curve parameter detection device |
-
2019
- 2019-10-17 CN CN201910986134.8A patent/CN110648581A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111899626A (en) * | 2020-06-02 | 2020-11-06 | 浙大城市学院 | Multifunctional experiment teaching instrument and experiment method for disc-shaped cam mechanism of oscillating follower |
| CN111899627A (en) * | 2020-06-02 | 2020-11-06 | 浙大城市学院 | Multifunctional experimental teaching instrument of space cam mechanism |
| CN111899627B (en) * | 2020-06-02 | 2022-04-12 | 浙大城市学院 | Multifunctional experimental teaching instrument of space cam mechanism |
| CN111899626B (en) * | 2020-06-02 | 2022-07-08 | 浙大城市学院 | Multifunctional experiment teaching instrument and experiment method for disc-shaped cam mechanism of oscillating follower |
| CN113607033A (en) * | 2021-08-02 | 2021-11-05 | 常熟纺织机械厂有限公司 | Cam curve parameter detection device |
| CN113607033B (en) * | 2021-08-02 | 2024-01-26 | 常熟纺织机械厂有限公司 | Cam curve parameter detection device |
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