CN1031510A - Belt capturing device - Google Patents

Belt capturing device Download PDF

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Publication number
CN1031510A
CN1031510A CN88103577A CN88103577A CN1031510A CN 1031510 A CN1031510 A CN 1031510A CN 88103577 A CN88103577 A CN 88103577A CN 88103577 A CN88103577 A CN 88103577A CN 1031510 A CN1031510 A CN 1031510A
Authority
CN
China
Prior art keywords
adhesive tape
frame
axle
guide groove
pressure roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN88103577A
Other languages
Chinese (zh)
Other versions
CN1011875B (en
Inventor
王成学
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
No2 Factory Of Xibei Coal Mining Machinery Corp
LU'AN MINERAL ENGINEERING ADMINISTRATION
Original Assignee
No2 Factory Of Xibei Coal Mining Machinery Corp
LU'AN MINERAL ENGINEERING ADMINISTRATION
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by No2 Factory Of Xibei Coal Mining Machinery Corp, LU'AN MINERAL ENGINEERING ADMINISTRATION filed Critical No2 Factory Of Xibei Coal Mining Machinery Corp
Priority to CN88103577A priority Critical patent/CN1011875B/en
Publication of CN1031510A publication Critical patent/CN1031510A/en
Publication of CN1011875B publication Critical patent/CN1011875B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3415—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated in hot water, e.g. boil pouches
    • B65D81/3423—Packages shrinking in hot water, e.g. for boiling hams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1328—Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y10T428/1383—Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2809—Web or sheet containing structurally defined element or component and having an adhesive outermost layer including irradiated or wave energy treated component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2813—Heat or solvent activated or sealable
    • Y10T428/2817—Heat sealable
    • Y10T428/2826—Synthetic resin or polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide
    • Y10T428/31739—Nylon type
    • Y10T428/31743—Next to addition polymer from unsaturated monomer[s]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide
    • Y10T428/3175—Next to addition polymer from unsaturated monomer[s]

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Adhesive Tapes (AREA)
  • Belt Conveyors (AREA)

Abstract

The present invention is that a kind of adhesive tape conveyor is operated in that the inclination angle is big, the fender guard of the seizure fracture adhesive tape under the haul distance elongate member.It is made up of pressure roller, base, clear device for coal, control setup and frame.Its structure principal feature is, when adhesive tape normally moves, pressure roller by frame support away from adhesive tape, when fracture takes place in adhesive tape, pressure roller moves downward along the guide groove on the frame under the effect of control setup, and the combined action of pressure roller and base is caught the adhesive tape that glides tightly.

Description

Belt capturing device
The invention belongs to a kind of belt capturing device.
At present, when China's coal-mine down-hole inclined shaft utilizes adhesive tape conveyor toward aboveground fortune coal, the fender guard of catching the fracture adhesive tape is not set.The adhesive tape conveyor big for the inclination angle, that haul distance is long, in the course of the work, if in a single day adhesive tape ruptures, adhesive tape glides under the effect of its deadweight and coal, and grave accident will take place.The adhesive tape of fracture not only can stop up pit shaft, and will destroy all facilities of pit shaft, comprises adhesive tape frame itself, and according to the pertinent data statistics, the grave accident that adhesive tape generation fracture causes once took place repeatedly in China.
According to the data that we grasped, there is not the device of practical, safe and reliable seizure fracture adhesive tape at present abroad yet.
The purpose of this invention is to provide a kind of coal mine and have a down dip the tunnel when utilizing adhesive tape conveyor, in case the adhesive tape fracture takes place and the adhesive tape that glides can be caught the belt capturing device that does not damage adhesive tape tightly toward aboveground fortune coal.
Below in conjunction with description of drawings technical scheme of the present invention.
Fig. 1 is the technical solution of the present invention scheme drawing;
Fig. 2 is a moulding scheme drawing of going up pressure roller (1) and lower compression roller (2) of the present invention;
Fig. 3 is clear device for coal of the present invention (a 8) structural representation.
(1) → service direction of last adhesive tape when representing the transport plane normal operation among Fig. 1; (2) → during expression transport plane normal operation or the broken belt service direction of adhesive tape at present.
Belt capturing device provided by the present invention has:
(1) goes up pressure roller (1), lower compression roller (2), the little axle at last pressure roller (1) axis direction two ends is placed on respectively in the last guide groove (4) that is provided with on frame (3) biside plate, and support by this guide groove (4), the little axle at lower compression roller (2) axis direction two ends is placed on respectively in the following guide groove (5) that is provided with on frame (3) biside plate, and is supported by this guide groove (5);
(2) upper bed-plate (6), lower bottom base (7), upper bed-plate (6) places between adhesive tape and the following adhesive tape, is fixed on frame (3) biside plate, and lower bottom base (7) is placed on down the bottom of adhesive tape, is fixed on the frame (3);
(3) clear device for coal (8), two axle heads on this device are placed on respectively on another that is provided with on frame (3) biside plate in the guide groove (9);
(4) control setup (10).
Control setup among the present invention (10) can be made up of two rocking bars and an axle, axle be placed on frame (3) biside plate and its corresponding hole in, and by this two holes support, the bottom of rocking bar is inverted U-shaped, top has two wings, simultaneously tangent with the axle of the axle of last pressure roller (1) and clear device for coal (8), also have one and the corresponding circular hole of axle in the middle of two wings of rocking bar top, the bottom of two rocking bars rides over respectively on two little axles with its corresponding lower compression roller (2).
Clear device for coal (8) among the present invention can be made up of a v-shaped plate and axle fixed thereon.
Frame among the present invention (3) can all be provided with a steel plate of establishing in its both sides, biside plate equal height, same area place are provided with identical guide groove and circular hole.
Working process of the present invention is:
When adhesive tape conveyor is operated in inclined shaft and is in normal operating condition, last pressure roller (1)
Support by the last guide groove (4) on the frame (3), be in the upper position of guide groove (4), above last adhesive tape, have certain distance, normally pass through so that guarantee the coal that last adhesive tape carries apart from gluing.Clear device for coal (8) is gone up guide groove (9) by on the frame (3) another and is supported, and is in the upper position of this guide groove, above last adhesive tape, has certain distance apart from gluing, so that the coal that adhesive tape carries in the assurance normally passes through.Lower compression roller (2) is supported by the following guide groove (5) on the frame (3), is in the upper position of guide groove (5) down, following tangent with last adhesive tape, and lower compression roller (2) can be done and the consistent rotation of gluing tape running direction.The bottom of two rocking bars rides on the little axle of lower compression roller (2) in the control setup (10), and the bottom of the little axle of the left wing on two rocking bar tops and last pressure roller (1) is tangent, and the right wing on top is tangent with the top of (8) two little axles of clear device for coal.
When fracture took place adhesive tape, last adhesive tape at first glided under the effect of its deadweight and contained coal, and lower compression roller (2) acts on following guide groove (5) downslide on the effect lower edge frame (3) of all one's effort on it at last adhesive tape.Simultaneously, drive in the control setup (10) of the rotation of two rocking bars around control setup (10) axis, make go up pressure roller (1) and clearly device for coal (8) move downward along separately last guide groove (4), (9) respectively simultaneously.Design the guide groove on frame (3) biside plate according to actual needs, make clear device for coal (9) move to the extreme lower position of its guide groove (9) earlier, the still removing of the coal on the adhesive tape on gliding that will contact with clear device for coal (9) bottom, after this, to move to the bottom along self guide groove (4) tangent with the last adhesive tape that has been eliminated coal for last pressure roller (1).Because guide groove (4) bottom of last pressure roller (1) is to the adhesive tape gliding direction angle that tilts, institute's above pressure roller (1) acts under the combined action of the tangential force on it at adhesive tape in its deadweight and the downslide, and continuation is moved to the adhesive tape gliding direction; Again because when last pressure roller
When (1) moving to the extreme lower position of the guide groove (4) that self leads, distance between last pressure roller (1) and the upper bed-plate (6) is less than the thickness of adhesive tape, so, along with last pressure roller (1) constantly moving to its guide groove (4) extreme lower position, distance between last pressure roller (1) and the upper bed-plate (6) is constantly dwindled, the power of adhesive tape then constantly increases in last pressure roller (1) and upper bed-plate (6) seizure, and then will go up adhesive tape and catch tightly, make the last adhesive tape of fracture act on or else downslide under the combined action of the power of catching thereon at last pressure roller (1) and upper bed-plate (6).In addition, lower compression roller (2) and lower bottom base (7) are also caught (speed that following adhesive tape glides is less than last adhesive tape) tightly according to the following adhesive tape that the mode of adhesive tape in last pressure roller (1) and upper bed-plate (6) seizure will glide, and make the following adhesive tape that glides to glide.From the above, when adhesive tape generation fracture accident, the adhesive tape up and down that glides acts on respectively at last pressure roller (1) and upper bed-plate (6), lower compression roller (2) and lower bottom base (7) under the combined action of seizure power thereon and can not glide, thereby reached the rupture purpose of adhesive tape of seizure.
The present invention is owing to adopt said structure and the course of work to make it have following advantage:
1. the downslide adhesive tape of fracture can be caught, seizure power is enough, and is safe and reliable.
2. this trap setting is simple in structure, and the parts compactness adapts to the coal mine narrow needs of lane space that have a down dip.
3. belt capturing device does not damage adhesive tape again when guaranteeing to catch the downslide adhesive tape that firmly ruptures.
4. it is ingenious that control setup is got the broken belt signal, and control is sensitive, accurately and reliably.

Claims (4)

1, a kind of belt capturing device is characterized in that having:
(1) the little axle at last pressure roller (1), lower compression roller (2), last pressure roller (1) axis direction two ends is placed on respectively in the last guide groove (4) that is provided with on frame (3) biside plate, and support by this guide groove (4), the little axle at lower compression roller (2) axis direction two ends is placed on respectively in the following guide groove (5) that is provided with on frame (3) biside plate, and support by this guide groove (5)
(2) upper bed-plate (6), lower bottom base (7), upper bed-plate (6) places between adhesive tape and the following adhesive tape, is fixed on frame (3) biside plate, and lower bottom base (7) is placed on down the bottom of adhesive tape, is fixed on the frame (3),
(3) clear device for coal (8), two axle heads on this device are placed on respectively on another that is provided with on frame (3) biside plate in the guide groove (9),
(4) control setup (10).
2, belt capturing device according to claim 1, it is characterized in that control setup (10) is made up of two rocking bars and an axle, axle be placed on frame (3) biside plate and its corresponding hole in, and by this two holes support, the bottom of rocking bar is inverted U-shaped, top has two wings, simultaneously tangent with the axle of the axle of last pressure roller (1) and clear device for coal (8), also have one and the corresponding circular hole of axle in the middle of rocking bar top two wings, the bottom of two rocking bars rides over respectively on two little axles with its corresponding lower compression roller (2).
3, belt capturing device according to claim 1 is characterized in that device for coal (8) is made up of a v-shaped plate and axle fixed thereon clearly.
4, belt capturing device according to claim 1 is characterized in that frame (3) both sides all are provided with a steel plate of establishing, and biside plate equal height, same area place are provided with identical guide groove and circular hole.
CN88103577A 1988-06-11 1988-06-11 Belt capturing device Expired CN1011875B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN88103577A CN1011875B (en) 1988-06-11 1988-06-11 Belt capturing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN88103577A CN1011875B (en) 1988-06-11 1988-06-11 Belt capturing device

Publications (2)

Publication Number Publication Date
CN1031510A true CN1031510A (en) 1989-03-08
CN1011875B CN1011875B (en) 1991-03-06

Family

ID=4832667

Family Applications (1)

Application Number Title Priority Date Filing Date
CN88103577A Expired CN1011875B (en) 1988-06-11 1988-06-11 Belt capturing device

Country Status (1)

Country Link
CN (1) CN1011875B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332464A (en) * 2013-07-02 2013-10-02 扬州凯思特机械有限公司 Broken belt capturing device for flat conveyer belt
CN103332463A (en) * 2013-07-02 2013-10-02 扬州凯思特机械有限公司 Capturing device of broken belt of groove-shaped conveying belt
CN106966136A (en) * 2017-03-22 2017-07-21 河南理工大学 A kind of ribbon conveyer Weight type belt break protection device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332464A (en) * 2013-07-02 2013-10-02 扬州凯思特机械有限公司 Broken belt capturing device for flat conveyer belt
CN103332463A (en) * 2013-07-02 2013-10-02 扬州凯思特机械有限公司 Capturing device of broken belt of groove-shaped conveying belt
CN103332463B (en) * 2013-07-02 2015-09-30 扬州凯思特机械有限公司 A kind of flute profile conveyor belt breakage break catching apparatus
CN103332464B (en) * 2013-07-02 2016-01-27 扬州凯思特机械有限公司 A kind of flat shape conveyor belt breakage break catching apparatus
CN106966136A (en) * 2017-03-22 2017-07-21 河南理工大学 A kind of ribbon conveyer Weight type belt break protection device

Also Published As

Publication number Publication date
CN1011875B (en) 1991-03-06

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