CN114568142B - Topping cutter, topping actuator and topping method - Google Patents
Topping cutter, topping actuator and topping method Download PDFInfo
- Publication number
- CN114568142B CN114568142B CN202011387359.0A CN202011387359A CN114568142B CN 114568142 B CN114568142 B CN 114568142B CN 202011387359 A CN202011387359 A CN 202011387359A CN 114568142 B CN114568142 B CN 114568142B
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- topping
- cutter
- blade
- blades
- mounting ring
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
Abstract
The invention provides a topping cutter, a topping actuator and a topping method, wherein the topping cutter comprises the following components: a cutter mounting ring, a drive mechanism and at least three blades; the blades are rotationally connected to the cutter mounting ring, and at least three blades are circumferentially distributed around the axis of the cutter mounting ring; the blade has a first blade edge and a second blade edge; the driving mechanism is connected with the blades and is used for driving each blade to rotate on the cutter mounting ring to an open state or a closed state; when the cutter is in an open state, the terminal bud to be topped can penetrate into the cutter mounting ring, and at least three blades surround the terminal bud to be topped; when in a closed state, the first edge of one blade abuts against the second edge of the other blade in the adjacent two blades. The invention relieves the technical problem that the side branches and the leaves around the top buds of the cotton are easy to damage when the cotton is topped in the prior art, and the yield of the cotton is reduced.
Description
Technical Field
The invention relates to the technical field of agricultural machinery equipment, in particular to a topping cutter, a topping actuator and a topping method.
Background
Cotton topping refers to pinching off the top buds of cotton in order to inhibit the top dominance of the cotton, promote the growth of side branches and increase the yield in the cotton growth process. Cotton topping is an indispensable operation in the cotton planting process. Currently, cotton topping techniques include manual pinching, cutting topping, manual shearing topping, and mechanical automated topping. Mechanical automated topping devices typically cut cotton using a disc cutter. The cotton terminal bud is typically 5 cm below the top cotton leaf. The disc cutter is easy to damage side branches and leaves around the cotton terminal buds while the cotton terminal buds are knocked off, so that the cotton yield is reduced.
Disclosure of Invention
The invention aims to provide a topping cutter, a topping actuator and a topping method, which are used for solving the technical problem that the side branches and blades around the top buds of cotton are easily damaged when topping cotton in the prior art, so that the yield of the cotton is reduced.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a topping cutter, comprising: a cutter mounting ring, a drive mechanism and at least three blades; the blades are rotationally connected to the cutter mounting ring, and at least three blades are circumferentially distributed around the axis of the cutter mounting ring; the blade has a first blade edge and a second blade edge; the driving mechanism is connected with the blades and is used for driving the blades to rotate on the cutter mounting ring to an open state or a closed state; when in the open state, the terminal bud to be topped can penetrate into the cutter mounting ring, and at least three blades surround the terminal bud to be topped; when in the closed state, the first edge of one of the adjacent two blades abuts against the second edge of the other blade.
In a preferred embodiment, the first blade is curved to be convex outward, the second blade is curved to be concave inward, and the radius of the curved shape of the first blade is equal to the radius of the curved shape of the second blade.
In a preferred embodiment, the tool mounting ring is provided with at least three radial through slots on its side, in which the blades are mounted.
In a preferred embodiment, the driving mechanism includes a motor, a driving housing, a sun gear, and at least three planetary gears, each of which is mounted to the driving housing and is capable of rotating on the driving housing, at least three of the planetary gears are disposed around the sun gear, and the planetary gears are engaged with the sun gear; the motor is connected with the sun gear, at least three planetary gears are in one-to-one correspondence with at least three blades, and the planetary gears are connected with rotating shafts of the blades.
In a preferred embodiment, the drive mechanism includes an internal gear disk mounted to the drive housing; the internal gear plate can rotate in the driving seat, the central gear is arranged in the internal gear plate and is coaxial with the internal gear plate, the planetary gears are arranged in the internal gear plate, and the planetary gears are meshed with the internal gear plate.
In a preferred embodiment, the planetary gear is connected with a transmission output shaft, and the transmission output shaft is connected with the rotating shaft of the blade; the driving seat body is arranged above the cutter mounting ring; the transmission output shaft is sleeved with a connecting sleeve, the upper end of the connecting sleeve is fixedly connected with the driving seat body, and the lower end of the connecting sleeve is fixedly connected with the cutter mounting ring.
In a preferred embodiment, the topping cutter comprises a top plate fixedly arranged above the driving seat body, and the motor is fixed on the top plate; the side wall of the top plate is provided with a plurality of dials She Aocao, and the dials She Aocao are recessed inwards along the radial direction of the cutter mounting ring.
In a preferred embodiment, the top plate is connected with the driving seat body through a plurality of connecting rods, and the top surface of the top plate is provided with a mounting connecting seat.
The invention provides a topping actuator, comprising: the topping cutter is arranged on the moving device, and the moving device can drive the topping cutter to move.
The invention provides a topping method, which adopts the topping cutter and comprises the following steps:
step S10, the driving mechanism drives the blade to rotate to the open state;
step S20, the cutter mounting ring moves from top to bottom, so that at least three blades surround the terminal buds to be topped;
and S30, the driving mechanism drives the blade to rotate to the closed state, and the terminal buds are sheared off.
The invention has the characteristics and advantages that:
in the topping cutter, at least three blades are circumferentially distributed, and shearing is realized through opening and closing of the at least three blades. When the device works, the topping cutter is kept in an open state, and can move downwards from top to bottom, so that the top bud to be topping penetrates into the cutter mounting ring, at least three blades surround the top bud to be topping, and the driving mechanism drives at least three blades to be closed to shear the top bud. The topping cutter can accurately shear the terminal buds, reduces the lateral branches and blades around the terminal buds of cotton from entering the cutter mounting ring, reduces the damage to the lateral branches and the blades, and is beneficial to improving the cotton yield.
This topping cutter cuts the back with the terminal bud, and at least three blade can keep closed state to bear the terminal bud of cutting, this topping cutter can carry the terminal bud, shifts out terminal bud position department, conveniently collects the terminal bud, avoids the terminal bud to fall in cotton field, is favorable to preventing that cotton from receiving the insect pest influence, has improved cotton quality and output.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a topping cutter provided by the invention;
FIG. 2 is a schematic view of the blade in the topping cutter shown in FIG. 1 in an open position;
FIG. 3 is a schematic view of the blade in the topping cutter shown in FIG. 1 in a closed position;
FIG. 4 is a schematic illustration of the attachment of the blade to the tool mounting ring in the topping tool of FIG. 1;
FIG. 5 is a schematic view of the blade in the topping cutter shown in FIG. 1;
FIG. 6 is a schematic view of a drive mechanism in the topping cutter shown in FIG. 1;
FIG. 7 is a left side view of FIG. 6;
FIG. 8 is a top view of FIG. 1;
FIG. 9 is a front view of FIG. 1;
fig. 10 is a schematic diagram of a topping method according to the present invention.
Reference numerals illustrate:
10. a cutter mounting ring; 100. an axis of the tool mounting ring; 11. radial through grooves;
20. a blade; 21. a first blade; 22. a second blade; 23. a blade mounting shaft; 24. a knife handle;
30. a driving mechanism; 31. a motor; 32. a transmission input shaft; 33. a transmission output shaft; 34. a connecting sleeve;
40. a driving seat body; 41. a sun gear; 42. a planetary gear; 43. an internal gear disk;
50. a top plate; 51. a dial She Aocao;
60. a connecting rod; 70. installing a connecting seat; 71. and (5) mounting a rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The present invention provides a topping cutter, as shown in fig. 1 to 3 and 9, comprising: a cutter mounting ring 10, a drive mechanism 30, and at least three blades 20; the blades 20 are rotatably connected to the tool mounting ring 10, with at least three blades 20 circumferentially distributed about the axis 100 of the tool mounting ring; the blade 20 has a first blade edge 21 and a second blade edge 22; the driving mechanism 30 is connected with the blades 20 and is used for driving each blade 20 to rotate on the cutter mounting ring 10 to an open state or a closed state; when in the open state, the terminal bud to be topped can penetrate into the cutter mounting ring 10, and at least three blades 20 surround the terminal bud to be topped; when in the closed state, the first edge 21 of one blade 20 abuts against the second edge 22 of the other blade 20 in the adjacent two blades 20.
In the topping cutter, at least three blades 20 are circumferentially distributed, shearing is realized by opening and closing at least three blades 20, and shearing of terminal buds is completed when a first blade 21 of one blade 20 and a second blade 22 of the other blade 20 are gradually close to each other to be abutted. When the topping cutter works, the topping cutter can move from top to bottom, so that the top buds to be topping penetrate into the cutter mounting ring 10, at least three blades 20 surround the top buds to be topping, and the driving mechanism 30 drives the at least three blades 20 to be closed so as to shear the top buds. The topping cutter can shear the terminal buds more accurately, and side branches and blades around the terminal buds of cotton are reduced to enter the cutter mounting ring 10, so that damage to the side branches and the blades is reduced, and the cotton yield is improved.
After the top cutting tool cuts off the terminal buds, at least three blades 20 can be kept in a closed state so as to bear the cut terminal buds, the top cutting tool can carry the terminal buds to move out of the position of the terminal buds, the terminal buds are conveniently collected, the terminal buds are prevented from falling in cotton fields, the cotton is prevented from being affected by diseases and insect pests, and the quality and the yield of cotton are improved.
As shown in fig. 2 and 4, the blade 20 is mounted to the tool mounting ring 10 by a blade mounting shaft 23, the blade mounting shaft 23 serving as a rotation shaft of the blade 20, and the blade 20 is rotatable on the tool mounting ring 10 about an axis of the blade mounting shaft 23. Preferably, the blade mounting shaft 23 of each blade 20 is parallel to the axis 100 of the tool mounting ring. The individual blade mounting shafts 23 may be evenly circumferentially distributed about the axis 100 of the tool mounting ring. In one embodiment, the blade 20 has an integrally formed handle 24, and the tool mounting shaft is provided to the handle 24.
The blades 20 distributed circumferentially cut the terminal buds by opening and closing, and the structure can shorten the movement stroke of the blades 20 for cutting the cotton terminal buds and improve the topping efficiency. The blade 20 is made of a lightweight material, preferably an aluminum alloy. The number of blades 20 may be 3, 4 or 5, preferably the number of blades 20 is 3, and the 3 blades 20 are circumferentially uniformly arranged. The dimensional parameters of the blade 20 may be designed based on the cotton terminal bud status.
As shown in fig. 3 and 5, the first blade 21 is in an outwardly convex arc shape, the second blade 22 is in an inwardly concave arc shape, and the arc shape of the first blade 21 is equal to the arc shape of the second blade 22 in radius, so that the respective blades 20 are conveniently opened and closed, and in the closed state, the first blade 21 and the second blade 22 are abutted together in the adjacent two blades 20 so as to cut off the terminal bud more stably and reliably, and bear the bearing of the cut-off terminal bud.
In one embodiment of the invention, the tool mounting ring 10 is provided with at least three radial through slots 11 on the side, and the inserts 20 are mounted in the radial through slots 11. The cutter mounting ring 10 can better protect the blade 20 and reduce the blocking of sundries to the movement of the blade 20; and, the top surface of the cutter mounting ring 10 is higher than the blades 20, and in the closed state, the upper parts of the blades 20 form grooves which can accommodate the sheared terminal buds and prevent the terminal buds from falling into the cotton fields.
The drive mechanism 30 provides power for rotation of the blade 20, and the structure of the drive mechanism 30 is not limited to one type, for example: the drive mechanism 30 may include a plurality of motors, each motor being coupled in a one-to-one correspondence with each blade 20. The inventor has made improvements in the structure of the drive mechanism 30: the drive mechanism 30 includes a motor 31, a drive housing 40, a sun gear 41, and at least three planetary gears 42, as shown in fig. 6, the sun gear 41 and the planetary gears 42 are each mounted to the drive housing 40 and are capable of rotating on the drive housing 40, the at least three planetary gears 42 are disposed around the sun gear 41, and the planetary gears 42 are meshed with the sun gear 41; the motor 31 is connected to the sun gear 41, at least three planetary gears 42 are in one-to-one correspondence with at least three blades 20, and the planetary gears 42 are connected to the blade mounting shaft 23. With this structure, at least three planetary gears 42 can be driven to rotate synchronously by one sun gear 41, so that each blade 20 is driven to rotate synchronously, closing and opening are realized, the terminal bud is cut off, the efficiency is improved, the structure is simplified, the structure is more compact, and the volume of the topping cutter is reduced.
Further, the driving mechanism 30 includes an internal gear plate 43 mounted to the driving housing 40; the internal gear plate 43 is rotatable in the drive housing 40, the sun gear 41 is disposed coaxially within the internal gear plate 43, the planetary gears 42 are disposed within the internal gear plate 43, and the planetary gears 42 are meshed with the internal gear plate 43. The internal gear 43 can rotate freely relative to the driving base 40, and the internal gear 43 can provide support for the planetary gears 42, so that the planetary gears 42 rotate more smoothly. Specifically, the driving housing 40 is provided with a cylindrical inner cavity in which the internal gear plate 43 is disposed, and a side wall of the internal gear plate 43 is slidably fitted with an inner wall of the cylindrical inner cavity so that the internal gear plate 43 can smoothly rotate within the cylindrical inner cavity.
As shown in fig. 1, 2, 6 and 7, the planetary gear 42 is connected to a transmission output shaft 33, and the transmission output shaft 33 is connected to the blade mounting shaft 23; the driving seat body 40 is arranged above the cutter mounting ring 10; the transmission output shaft 33 is sleeved with a connecting sleeve 34, the upper end of the connecting sleeve 34 is fixedly connected with a driving seat body 40, and the lower end of the connecting sleeve 34 is fixedly connected with a cutter mounting ring 10. The driving seat body 40 and the cutter mounting ring 10 are relatively fixed through the connecting sleeve 34, so that the stability of the whole structure is improved; the transmission output shaft 33 is installed in the round hole of the driving seat body 40, the transmission output shaft 33 can rotate around the axis of the transmission output shaft 33 on the driving seat body 40, and the planetary gear 42 drives the blade 20 to rotate through the transmission output shaft 33.
In an embodiment of the present invention, the topping cutter includes a top plate 50 fixed above the driving base 40, as shown in fig. 1 and 8, the motor 31 is fixed on the top plate 50; the side wall of the top plate 50 is provided with a plurality of dials She Aocao, the dials She Aocao being recessed radially inward of the tool mounting ring 10. The motor 31 is connected to a sun gear 41 via a transmission input shaft 32. When the topping cutter moves from top to bottom, the leaves around the top buds can be pulled out, the leaves are protected from being damaged by the cutter, and the cotton yield is improved; by arranging the poking She Aocao, better poking of leaves with higher growth vigor is facilitated.
As shown in fig. 1 and 9, the top plate 50, the driving seat body 40 and the cutter mounting ring 10 are sequentially arranged from top to bottom, thus simplifying the transmission structure and facilitating the pulling out of the leaves around the terminal bud and bearing the cut-off terminal bud during topping. Specifically, the top plate 50 is connected with the inner gear 43 through a plurality of connecting rods 60, the top surface of the top plate 50 is provided with a mounting connecting seat 70 for connecting with an external mechanism, the topping cutter can be mounted on a moving device through the mounting connecting seat 70, and the topping cutter is driven to move up and down through the moving device. Specifically, as shown in fig. 1, the mounting connection base 70 may include a plurality of mounting bars 71.
The motor 31 can adopt a 24V direct current motor 31, and the direct current motor 31 is used for dampproof, dustproof and sun-proof protection, and is suitable for the use environment of fields. As a specific embodiment of the invention, in order to better adapt to cotton topping, the topping cutter is optimally designed, and the topping cutter has a mass of 3.5Kg. The motor 31 is installed to be dampproof and dustproof, and is suitable for the working environment; the motor 31 has a power of 200W and a mass of less than 2Kg and has an electric controller for opening, closing, speed regulation and forward and reverse rotation. The diameter of the inner hole of the cutter mounting ring 10 is 80-100 mm, so that most cotton terminal buds can enter the hole, and peripheral side branches and cotton leaves do not enter the cutter mounting ring 10; the insert 20 and the tool mounting ring 10 are preferably aluminum material model 6061, which reduces the weight of the tool while providing rust protection. The thickness of the driving seat body 40 is 40mm, the size of a transmission gap is ensured to be within 0.5-2mm during processing and installation, and the driving seat body is coated with lubricant and completely sealed, so that the flexible and light transmission is kept. The transmission input shaft 32 and the transmission output shaft 33 are made of high-quality carbon steel, so that the strength of the driving mechanism 30 is ensured.
When the topping cutter is used for topping cotton, the topping cutter can realize topping off of cotton terminal buds and reduce damage to peripheral side branches and blades; in addition, the topping cutter also has a function of collecting topping cotton terminal buds, prevents cotton bolls from being affected by diseases and insect pests, and can effectively improve the quality and yield of cotton. The topping cutter is not only suitable for cotton topping operation, but also suitable for agronomic processes such as crop picking, harvesting, pruning and the like.
Example two
The invention provides a topping actuator, comprising: the moving device and the topping cutter are arranged on the moving device, and the moving device can drive the topping cutter to move. The moving device can drive the topping cutter to move up and down so that the blade to be topping penetrates into the cutter mounting ring 10; in particular, the movement means may be a robotic arm.
The topping cutter adopted by the topping actuator can shear the terminal buds more accurately, and side branches and blades around the terminal buds of cotton are reduced from entering the cutter mounting ring 10, so that damage to the side branches and the blades is reduced, and the cotton yield is improved; after the top cutting tool cuts off the top buds, at least three blades 20 can be kept in a closed state so as to bear the cut top buds and collect the top buds conveniently, the top cutting tool can carry the top buds, the moving device drives the top cutting tool to move out of the position of the top buds, the blades 20 are opened again after the top cutting tool moves out of the cotton ridge, the top buds are prevented from falling into cotton fields, the influence of diseases and insect pests on cotton is prevented, and the quality and the yield of the cotton are improved.
Example III
The invention provides a topping method, which adopts the topping cutter, as shown in fig. 10, and comprises the following steps: step S10, the driving mechanism 30 drives the blade 20 to rotate to an open state; step S20, the cutter mounting ring 10 moves from top to bottom, so that at least three blades 20 surround the top buds to be topped; in step S30, the driving mechanism 30 drives the blade 20 to rotate to the closed state, and the terminal bud is sheared.
The topping method can accurately shear the terminal buds, reduces the entering of side branches and blades around the terminal buds into the cutter mounting ring 10, reduces the damage to the side branches and blades, and is beneficial to improving the cotton yield; after the top cutting tool cuts off the terminal buds, at least three blades 20 can be kept in a closed state so as to bear the cut terminal buds, the top cutting tool can carry the terminal buds to move out of the terminal bud positions, the terminal buds are conveniently collected, the terminal buds are prevented from falling into cotton fields, the cotton is prevented from being affected by diseases and insect pests, and the cotton quality and yield are improved.
Further, the topping method can be based on a cotton top bud recognition positioning technology, the height of the cotton top buds is detected through a sensor, the positions of the cotton top buds are recognized, then a motion device is controlled to drive a topping cutter to move to the top buds to be topping, topping is carried out, and mechanical automatic topping is achieved.
The foregoing is merely a few embodiments of the present invention and those skilled in the art may make various modifications or alterations to the embodiments of the present invention in light of the disclosure herein without departing from the spirit and scope of the invention.
Claims (8)
1. A topping cutter, comprising: a cutter mounting ring, a drive mechanism and at least three blades; the blades are rotationally connected to the cutter mounting ring, and at least three blades are circumferentially distributed around the axis of the cutter mounting ring;
the blade has a first blade edge and a second blade edge; the driving mechanism is connected with the blades and is used for driving the blades to rotate on the cutter mounting ring to an open state or a closed state;
when in the open state, the terminal bud to be topped can penetrate into the cutter mounting ring, and at least three blades surround the terminal bud to be topped;
when in the closed state, the first edge of one blade is abutted with the second edge of the other blade in two adjacent blades;
the driving mechanism comprises a motor, a driving seat body, a sun gear and at least three planetary gears, wherein the sun gear and the planetary gears are both arranged on the driving seat body and can rotate on the driving seat body, the at least three planetary gears are arranged around the sun gear, and the planetary gears are meshed with the sun gear;
the motor is connected with the central gear, at least three planetary gears are in one-to-one correspondence with at least three blades, and the planetary gears are connected with rotating shafts of the blades;
the driving mechanism further comprises an internal gear disk arranged on the driving seat body; the internal gear plate can rotate in the driving seat, the central gear is arranged in the internal gear plate and is coaxial with the internal gear plate, the planetary gears are arranged in the internal gear plate, and the planetary gears are meshed with the internal gear plate.
2. The topping cutter of claim 1, wherein the first blade is outwardly convex arcuate, the second blade is inwardly concave arcuate, and the arcuate of the first blade is equal to the arcuate of the second blade in radius.
3. The topping cutter of claim 1, wherein the cutter mounting ring is laterally provided with at least three radial channels in which the blades are mounted.
4. The topping cutter according to claim 1, wherein the planetary gear is connected with a transmission output shaft, and the transmission output shaft is connected with a rotating shaft of the blade;
the driving seat body is arranged above the cutter mounting ring; the transmission output shaft is sleeved with a connecting sleeve, the upper end of the connecting sleeve is fixedly connected with the driving seat body, and the lower end of the connecting sleeve is fixedly connected with the cutter mounting ring.
5. The topping cutter of claim 1, wherein the topping cutter comprises a top plate fixedly arranged above the driving seat body, and the motor is fixed on the top plate;
the side wall of the top plate is provided with a plurality of dials She Aocao, and the dials She Aocao are recessed inwards along the radial direction of the cutter mounting ring.
6. The topping cutter of claim 5, wherein the top plate is connected with the driving seat body through a plurality of connecting rods, and a mounting connecting seat is arranged on the top surface of the top plate.
7. A topping actuator, comprising: a movement device and the topping cutter according to any one of claims 1 to 6, wherein the topping cutter is mounted on the movement device, and the movement device can drive the topping cutter to move.
8. A topping method, characterized by using the topping cutter according to any one of claims 1 to 6, comprising:
step S10, the driving mechanism drives the blade to rotate to the open state;
step S20, the cutter mounting ring moves from top to bottom, so that at least three blades surround the terminal buds to be topped;
and S30, the driving mechanism drives the blade to rotate to the closed state, and the terminal buds are sheared off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011387359.0A CN114568142B (en) | 2020-12-01 | 2020-12-01 | Topping cutter, topping actuator and topping method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011387359.0A CN114568142B (en) | 2020-12-01 | 2020-12-01 | Topping cutter, topping actuator and topping method |
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| CN114568142A CN114568142A (en) | 2022-06-03 |
| CN114568142B true CN114568142B (en) | 2023-10-20 |
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| 高速旋转机械径向振动检测系统关键技术研究;佟庆彬;马惠萍;刘丽华;张晓冬;李桂斌;;仪器仪表学报(第05期);全文 * |
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