CN216678516U - Extrusion forming device for waste agricultural machinery - Google Patents

Extrusion forming device for waste agricultural machinery Download PDF

Info

Publication number
CN216678516U
CN216678516U CN202220163570.2U CN202220163570U CN216678516U CN 216678516 U CN216678516 U CN 216678516U CN 202220163570 U CN202220163570 U CN 202220163570U CN 216678516 U CN216678516 U CN 216678516U
Authority
CN
China
Prior art keywords
crushing
iron sheet
waste
extrusion
old
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.)
Active
Application number
CN202220163570.2U
Other languages
Chinese (zh)
Inventor
杨柳天
赵艳龙
李自康
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.)
Jining Yehong Environmental Protection Technology Development Co ltd
Original Assignee
Jining Yehong Scrapped Motor Vehicle Dismantling Co ltd
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 Jining Yehong Scrapped Motor Vehicle Dismantling Co ltd filed Critical Jining Yehong Scrapped Motor Vehicle Dismantling Co ltd
Priority to CN202220163570.2U priority Critical patent/CN216678516U/en
Application granted granted Critical
Publication of CN216678516U publication Critical patent/CN216678516U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Landscapes

  • Crushing And Pulverization Processes (AREA)

Abstract

The utility model discloses an extrusion forming device for waste agricultural machinery, which belongs to the technical field of waste agricultural machinery treatment and comprises an extrusion forming shell, a waste iron sheet crushing cavity and a waste iron sheet extrusion forming cavity, wherein the waste iron sheet crushing cavity is arranged at an opening at one side in the extrusion forming shell, and the waste iron sheet extrusion forming cavity is arranged at an opening at the other side of the extrusion forming shell, which is close to the lower position of the waste iron sheet crushing cavity. According to the iron sheet crushing device, the motor and the gear plate are used for transmission, so that the use of electric energy is reduced, the cost expenditure for iron sheet crushing is further reduced, the practicability and the universality of the device are improved, more energy is saved, the iron sheet can be more quickly pulled to enter the crushing roller for quick fine crushing through the crushing teeth on one side of the crushing fluted disc and the specially-made refining crushing teeth, the iron sheet is prevented from slipping between the crushing roller and the extrusion force applied to the iron sheet during crushing, and the efficiency for iron sheet crushing is increased.

Description

Extrusion forming device for waste agricultural machinery
Technical Field
The utility model belongs to the technical field of waste agricultural machinery treatment, and particularly relates to an extrusion forming device for waste agricultural machinery.
Background
Agricultural machinery refers to various machines used in the production process of crop planting and animal husbandry, and the primary processing and treatment process of agricultural and animal products, and the agricultural machinery needs to be disassembled after being scrapped, and the iron sheet of the agricultural machinery needs to be disassembled for extrusion forming in order to facilitate transportation and secondary use.
Traditional old and useless iron sheet extrusion device need smash the cutting back extrusion to the iron sheet, comparatively consume the use of electric energy when smashing the iron sheet, the kibbling cost of iron sheet has been increased, and traditional iron sheet rubbing crusher dish is comparatively single, it is comparatively low to smash tooth simple structure and lead to its crushing efficiency, the recovery efficiency again of old and useless iron sheet has been influenced, last traditional iron sheet extrusion device uses the inevitable mar that can produce of stripper plate for a long time, comparatively troublesome inconvenient change when changing the stripper plate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: in order to solve the above problems, an extrusion molding apparatus for a waste agricultural machine is provided.
The technical scheme adopted by the utility model is as follows: the utility model provides a waste agricultural machinery is with extrusion forming device, smashes chamber, waste iron sheet extrusion molding chamber including extrusion shell, waste iron sheet, the inside one side opening of extrusion shell is provided with waste iron sheet and smashes the chamber, extrusion shell opposite side is close to waste iron sheet and smashes chamber below position opening and is provided with waste iron sheet extrusion molding chamber, waste iron sheet is smashed intracavity portion and is provided with iron sheet and smashes conveying mechanism, waste iron sheet extrusion molding intracavity portion is provided with extrusion forming mechanism, conveying mechanism is smashed to the iron sheet includes: motor, toothed disc, crushing roller, crushing fluted disc, crushing tooth, refine crushing tooth, crawler belt, the crushing chamber of old and useless iron sheet inner chamber fixed mounting has the motor, motor one side has the toothed disc through output shaft connection, the crushing intracavity portion both sides of old and useless iron sheet all run through to rotate and install crushing roller, two crushing equal fixed mounting in roller one side has crushing fluted disc, crushing fluted disc one side fixed mounting has crushing tooth, crushing tooth one side fixed mounting has the crushing tooth of refining, old and useless iron sheet is smashed the chamber and is close to crushing roller below position and be provided with crawler belt.
The gear disc is in meshed transmission connection with the two crushing rollers through the gear disc.
The crushing fluted discs on one side of the crushing rollers are arranged in a staggered mode, and the thinning crushing teeth are arranged in a triangular mode.
Wherein, extrusion mechanism includes: hydraulic telescoping rod, prevent slow-witted installation head, hydroforming plate, prevent slow-witted mounting groove, anti-skidding arch, bottom plate, lead screw slide rail, bottom plate standing groove, fixed mounting has hydraulic telescoping rod, a plurality of all runs through fixed mounting to old and useless iron sheet extrusion molding chamber top inner wall and inner wall both sides the equal fixed mounting in hydraulic telescoping rod one side has prevents slow-witted installation head, and is a plurality of prevent that slow-witted installation head one side all installs hydroforming plate, top through preventing slow-witted mounting groove screw rod screw thread hydroforming plate bottom fixed mounting has anti-skidding arch, the equal fixed mounting in old and useless iron sheet extrusion molding chamber bottom both sides has the lead screw slide rail, two threaded mounting has the bottom plate between the lead screw slide rail, old and useless iron sheet extrusion molding chamber bottom is close to bottom plate below position opening and is provided with the bottom plate standing groove.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1. according to the utility model, the motor and the gear plate are used for transmission, so that the use of electric energy is reduced, the cost for crushing the iron sheet is reduced, the practicability and the popularity of the device are increased, and more energy is saved.
2. According to the iron sheet crushing device, the iron sheet can be pulled into the crushing rollers more quickly to be crushed finely and rapidly through the crushing teeth on one side of the crushing fluted disc and the specially-made thinning crushing teeth, so that the iron sheet is prevented from slipping between the crushing rollers and the extrusion force applied to the iron sheet during crushing, and the iron sheet crushing efficiency is improved.
3. According to the utility model, the hydraulic forming plate is quickly replaced and installed through the fool-proof groove and the fool-proof installation head, the working labor force of workers is conveniently reduced through the bottom plate and the bottom plate placing groove, the cost expenditure of iron sheet hydraulic forming is further reduced, and the practicability of the device is improved.
Drawings
FIG. 1 is a schematic diagram of the front structure of the present invention;
FIG. 2 is a schematic diagram of an enlarged structure at A in FIG. 1 according to the present invention;
FIG. 3 is a schematic diagram of an enlarged structure at B of FIG. 1 according to the present invention;
FIG. 4 is a schematic diagram of a top view structure of a waste iron sheet crushing cavity in the utility model;
FIG. 5 is a schematic view of the side structure of the crushing roller in the present invention.
The labels in the figure are: 1. extruding and forming the shell; 101. a waste iron sheet crushing cavity; 102. extruding the waste iron sheet into a cavity; 2. a motor; 201. a gear plate; 3. a crushing roller; 301. crushing a fluted disc; 302. crushing teeth; 303. thinning and crushing teeth; 4. a crawler belt; 5. a hydraulic telescopic rod; 501. fool-proof mounting heads; 6. hydraulic forming of the plates; 601. a fool-proof mounting groove; 602. anti-skid projections; 7. a base plate; 701. a screw slide rail; 702. the bottom plate standing groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the utility model:
referring to fig. 1-5, an extrusion forming device for waste agricultural machinery comprises an extrusion forming shell 1, a waste iron sheet crushing cavity 101 and a waste iron sheet extrusion forming cavity 102, wherein the waste iron sheet crushing cavity 101 is arranged at an opening at one side inside the extrusion forming shell 1, the waste iron sheet extrusion forming cavity 102 is arranged at an opening at the other side of the extrusion forming shell 1, which is close to the lower position of the waste iron sheet crushing cavity 101, the waste iron sheet crushing cavity 101 is internally provided with an iron sheet crushing and conveying mechanism, and the waste iron sheet extrusion forming cavity 102 is internally provided with an extrusion forming mechanism;
iron sheet crushing and conveying mechanism includes: the device comprises a motor 2, a gear disc 201, a crushing roller 3, a crushing gear disc 301, crushing teeth 302, thinning crushing teeth 303 and a crawler belt 4;
waste iron sheet crushing cavity 101 one side inner chamber fixed mounting has motor 2, there is toothed disc 201 motor 2 one side through output shaft connection, waste iron sheet crushing cavity 101 inside both sides all run through to rotate and install crushing roller 3, two crushing roller 3 one sides equal fixed mounting have crushing fluted disc 301, crushing fluted disc 301 one side fixed mounting has crushing tooth 302, crushing tooth 302 one side fixed mounting has to refine crushing tooth 303, waste iron sheet crushing cavity 101 is close to and is provided with crawler belt 4 in crushing roller 3 below position.
Referring to fig. 1 and 4, in this embodiment, gear plate 201 is connected through gear plate interlock transmission with two crushing rollers 3, and the staff pours waste agricultural machine's iron sheet into waste iron sheet crushing chamber 101 through transport machinery, and staff's starter motor 2, and motor 2 passes through the output shaft and rotates gear plate 201, and two gear plates of gear plate 201 are the transmission of each other in pivoted simultaneously, make two crushing rollers 3 rotate and rub the iron sheet, have reduced the loss of electric energy source through the transmission, have reduced the kibbling cost spending of iron sheet.
Referring to fig. 1, 2, 4, 5, in this embodiment, the crushing fluted disc 301 of two crushing roller 3 one sides is the setting of staggering, it is triangle-shaped setting to refine crushing tooth 303, two crushing roller 3 are when rotating, a plurality of crushing fluted disc 301 are crisscross to rub the iron sheet each other, crushing tooth 302 of smashing fluted disc 301 one side cuts the supplementary crushing fluted disc 301 of cutting off of partial iron sheet pressure and cuts the iron sheet and smashes, it is triangle-shaped setting to refine crushing tooth 303 of crushing tooth 302 upside, the summit comparatively can effectually like the cutting to the iron sheet, it can effectually pull the iron sheet into two crushing roller 3 insides and smash to refine the gap between the crushing tooth 303 simultaneously, it is transported on crawler belt 4 to drop by kibbling old iron sheet.
Referring to fig. 1 and 3, in the present embodiment, the extrusion molding mechanism includes: the hydraulic expansion rod 5, the fool-proof mounting head 501, the hydraulic forming plate 6, the fool-proof mounting groove 601, the anti-skid protrusion 602, the bottom plate 7, the screw rod slide rail 701 and the bottom plate placing groove 702;
the inner wall of the top of the waste iron sheet extrusion molding cavity 102 and two sides of the inner wall are fixedly provided with hydraulic telescopic rods 5 in a penetrating way, one side of each hydraulic telescopic rod 5 is fixedly provided with a foolproof installation head 501, one side of each foolproof installation head 501 is provided with a plurality of trapezoidal anti-skidding blocks, one side of each foolproof installation head 501 is provided with a hydraulic molding plate 6 through screw threads of a foolproof installation groove 601, anti-skidding bulges 602 are fixedly arranged at the bottom of the top hydraulic molding plate 6, a crawler belt 4 transports the cut iron sheets to the waste iron sheet extrusion molding cavity 102 and drops on a bottom plate 7, a worker starts the hydraulic telescopic rods 5 at two sides to press the hydraulic molding plates 6 to extrude the two sides, then the worker starts the hydraulic telescopic rods 5 at the top to press down the hydraulic molding plates 6 at the top to compress the iron sheets into square blocks, and the bottom of the hydraulic molding plates 6 at the top is provided with a plurality of anti-skidding bulges 602, can increase and the iron sheet between frictional force, slide when avoiding the iron sheet to be extruded, use the mar when hydraulic forming board 6 is comparatively serious for a long time, the staff demolishs old hydraulic forming board 6 through the screw rod of preventing slow-witted installation head 501 one side, then carry out the threaded mounting through preventing slow-witted mounting groove 601 and preventing slow-witted installation head 501 with new hydraulic forming board 6 through one side, prevent that the trapezoidal groove of slow-witted mounting groove 601 bottom and prevent that trapezoidal arch in installation head 501 bottom can further prevent that hydraulic forming board 6 from taking place the dislocation when using, prevent simultaneously that slow-witted mounting groove 601 and prevent slow-witted installation head 501 from having made things convenient for the dismantlement installation of staff to hydraulic forming board 6.
Referring to fig. 1 and 3, in this embodiment, the screw rod sliding rails 701 are fixedly mounted on two sides of the bottom of the waste iron sheet extrusion forming cavity 102, the bottom plate 7 is installed between the two screw rod sliding rails 701 through threads, a bottom plate placing groove 702 is formed in the bottom of the waste iron sheet extrusion forming cavity 102 close to a position opening below the bottom plate 7, after extrusion forming is completed, a worker lowers the bottom plate 7 to the bottom plate placing groove 702 through the two screw rod sliding rails 701, so that the extruded square iron sheet blocks are flush with the ground, and the worker can conveniently transport the square iron sheet blocks.
In this embodiment, motor 2, crawler belt 4, lead screw slide rail 701 all with external power switch electric connection, hydraulic telescoping rod 5 and external hydraulic pump connection.
The working principle is as follows: firstly, a worker pours the iron sheet of the waste agricultural machine into the waste iron sheet crushing cavity 101 through a transport machine, the worker starts the motor 2, the motor 2 rotates the gear disc 201 through the output shaft, the gear disc 201 rotates and the two gear discs mutually transmit, so that the two crushing rollers 3 rotate to crush the iron sheet, the loss of an electric energy source is reduced through transmission, the cost of iron sheet crushing is reduced, the crushing gear discs 301 are mutually staggered to crush the iron sheet, the crushing teeth 302 on one side of the crushing gear disc 301 press and cut part of the iron sheet to assist the crushing gear disc 301 to cut and crush the iron sheet, the refined crushing teeth 303 on the upper side of the crushing teeth 302 are arranged in a triangle shape, the top point is sharp and can effectively like to cut the iron sheet, and the gaps between the refined crushing teeth 303 can effectively draw the iron sheet into the two crushing rollers 3 to crush, crushed old iron sheets drop onto a crawler belt 4 to be transported, the crawler belt 4 transports the cut iron sheets to the inside of a waste iron sheet extrusion molding cavity 102 to drop onto a bottom plate 7, a worker starts hydraulic telescopic rods 5 at two sides to press hydraulic molding plates 6 to extrude the two sides of the waste iron sheets, then the worker starts the hydraulic telescopic rods 5 at the top to press the hydraulic molding plates 6 at the top to compress the iron sheets into square blocks, a plurality of anti-slip protrusions 602 are arranged at the bottom of the hydraulic molding plates 6 at the top to increase the friction force between the anti-slip protrusions and the iron sheets and avoid the sliding of the iron sheets when the iron sheets are extruded, after extrusion molding, the worker lowers the bottom plate 7 into a bottom plate placing groove 702 through two lead screw slide rails 701, so that the extruded square iron sheets are flush with the ground, the worker can transport the iron sheets conveniently, when the hydraulic molding plates 6 are seriously scratched after being used for a long time, the staff demolishs old hydroformed plate 6 through the screw rod of preventing slow-witted installation head 501 one side, then carries out the screw thread installation with preventing slow-witted installation head 501 through the slow-witted mounting groove 601 of preventing of new hydroformed plate 6 through one side, prevents that the trapezoidal channel of slow-witted mounting groove 601 bottom can further prevent that hydroformed plate 6 from taking place the dislocation when using with preventing the trapezoidal arch of installation head 501 bottom, prevents slow-witted mounting groove 601 simultaneously and prevents slow-witted installation head 501 and made things convenient for the dismantlement installation of staff to hydroformed plate 6.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. The utility model provides a waste agricultural machinery is with extrusion forming device, includes extrusion shell (1), old and useless iron sheet crushing chamber (101), old and useless iron sheet extrusion molding chamber (102), the inside one side opening of extrusion shell (1) is provided with old and useless iron sheet crushing chamber (101), extrusion shell (1) opposite side is close to old and useless iron sheet crushing chamber (101) below position opening and is provided with old and useless iron sheet extrusion molding chamber (102), its characterized in that: an iron sheet crushing and conveying mechanism is arranged inside the waste iron sheet crushing cavity (101), and an extrusion forming mechanism is arranged inside the waste iron sheet extrusion forming cavity (102);
transport mechanism is smashed to iron sheet includes: the device comprises a motor (2), a gear plate (201), a crushing roller (3), a crushing fluted disc (301), crushing teeth (302), thinning crushing teeth (303) and a crawler belt (4);
motor (2) are installed to old and useless iron sheet crushing chamber (101) one side inner chamber, there is toothed disc (201) motor (2) one side through output shaft connection, old and useless iron sheet crushing chamber (101) inside both sides all run through movable mounting and have crushing roller (3), two crushing roller (3) one side all installs crushing fluted disc (301), crushing fluted disc (301) one side is installed and is smashed tooth (302), it installs to refine crushing tooth (303) to smash tooth (302) one side, old and useless iron sheet crushing chamber (101) are close to crushing roller (3) below position and are provided with crawler belt (4).
2. The extrusion molding apparatus for waste agricultural machinery as claimed in claim 1, wherein: the gear disc (201) is in meshed transmission connection with the two crushing rollers (3) through the gear disc.
3. The extrusion molding apparatus for waste agricultural machinery as claimed in claim 1, wherein: two crushing fluted discs (301) on one side of the crushing roller (3) are arranged in a staggered manner, and the thinning crushing teeth (303) are arranged in a triangular manner.
4. The extrusion molding apparatus for waste agricultural machinery as claimed in claim 1, wherein: the extrusion forming mechanism comprises: the hydraulic expansion rod (5), the fool-proof mounting head (501), the hydraulic forming plate (6), the fool-proof mounting groove (601), the anti-skid protrusion (602), the bottom plate (7), the screw rod slide rail (701) and the bottom plate placing groove (702);
old and useless iron sheet extrusion die cavity (102) top inner wall and inner wall both sides all run through and install hydraulic telescoping rod (5), are a plurality of hydraulic telescoping rod (5) one side is all installed and is prevented slow-witted installation head (501), and is a plurality of prevent slow-witted installation head (501) one side all installs hydraulic forming board (6), top through preventing slow-witted mounting groove (601) screw rod screw thread hydraulic forming board (6) bottom is installed anti-skidding arch (602).
5. The extrusion molding apparatus for waste agricultural machinery as claimed in claim 1, wherein: screw rod slide rails (701) are installed on two sides of the bottom of the waste iron sheet extrusion molding cavity (102), a bottom plate (7) is installed between the screw rod slide rails (701) in a threaded mode, and a bottom plate placing groove (702) is formed in the position, close to the bottom plate (7), of the bottom of the waste iron sheet extrusion molding cavity (102) in an open mode.
CN202220163570.2U 2022-01-21 2022-01-21 Extrusion forming device for waste agricultural machinery Active CN216678516U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220163570.2U CN216678516U (en) 2022-01-21 2022-01-21 Extrusion forming device for waste agricultural machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220163570.2U CN216678516U (en) 2022-01-21 2022-01-21 Extrusion forming device for waste agricultural machinery

Publications (1)

Publication Number Publication Date
CN216678516U true CN216678516U (en) 2022-06-07

Family

ID=81826126

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202220163570.2U Active CN216678516U (en) 2022-01-21 2022-01-21 Extrusion forming device for waste agricultural machinery

Country Status (1)

Country Link
CN (1) CN216678516U (en)

Similar Documents

Publication Publication Date Title
CN205392695U (en) Breaker for fodder
CN110385805B (en) A recovery processing device for abandonment tire
CN112387378A (en) Garbage crushing device for environment-friendly recycling bin
CN216678516U (en) Extrusion forming device for waste agricultural machinery
CN217568930U (en) Crushing device for waste copper recovery
CN210362066U (en) Plastic product compression reducing mechanism
CN213000228U (en) Cutting extrusion device is prepared in chinese-medicinal material mixture
CN111330515B (en) Biomass granulator
CN210758645U (en) Broken recovery unit of plastic bottle
CN211563203U (en) Paper crushing apparatus for product design
CN210808330U (en) Multifunctional silk kneading machine
CN2435409Y (en) Vertical bluish dogbane decorticating machine
CN211137604U (en) Energy-saving automatic brick pressing device
CN210121509U (en) Tea bag production is with extrusion reducing mechanism
CN210453360U (en) High efficiency rubbing crusher is used in plastics breakage
CN219745811U (en) Disassembling device for recycling waste batteries
CN2296765Y (en) Crusher
CN213349207U (en) Reducing mechanism is used in biodegradable plastic preparation
CN219583333U (en) Plastic crushing equipment
CN216857734U (en) Novel waste paper baling press
CN216801145U (en) Extruder with cooling device for aluminum profile production
CN221558637U (en) Continuous raw material crushing equipment
CN220075254U (en) PVC film recycling machine
CN217962871U (en) Waste plastic chair recycling and crushing device
CN221360313U (en) Waste plastic recycling and crushing device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: 272300 north head of Nanmazhuang village, ZAOCAO line, 500m west of Wangmiao Town, Yutai County, Jining City, Shandong Province

Patentee after: Jining Yehong Environmental Protection Technology Development Co.,Ltd.

Address before: 272300 north head of Nanmazhuang village, ZAOCAO line, 500m west of Wangmiao Town, Yutai County, Jining City, Shandong Province

Patentee before: Jining Yehong scrapped motor vehicle dismantling Co.,Ltd.

CP01 Change in the name or title of a patent holder
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Extrusion forming device for waste agricultural machinery

Effective date of registration: 20220926

Granted publication date: 20220607

Pledgee: Shandong Yutai Rural Commercial Bank Co.,Ltd.

Pledgor: Jining Yehong Environmental Protection Technology Development Co.,Ltd.

Registration number: Y2022980016246

PE01 Entry into force of the registration of the contract for pledge of patent right