CN109817483B - Safe and reliable switching device of power system - Google Patents
Safe and reliable switching device of power system Download PDFInfo
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- CN109817483B CN109817483B CN201910087027.1A CN201910087027A CN109817483B CN 109817483 B CN109817483 B CN 109817483B CN 201910087027 A CN201910087027 A CN 201910087027A CN 109817483 B CN109817483 B CN 109817483B
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Abstract
The invention relates to a safe and reliable switch device of an electric power system, which comprises a bottom plate, a blade and two contact plates, the blade is positioned between the two contact plates, the contact plates are vertical to the bottom plate, the blade and the contact plates are positioned at the same side of the bottom plate, the blade is obliquely arranged, the contact plates are positioned between the blade and the bottom, the minimum distance between the two contact plates is smaller than the thickness of the blade, the bottom plate is provided with a protection mechanism, the protection assembly is arranged on one side of the bottom plate close to the blade, the two contact plates are respectively provided with a connecting mechanism, the connecting mechanisms are positioned on one sides of the contact plates far away from the blade, this electric power system's safe and reliable's switching device has improved the security through protection mechanism, and so, still improve the reliability through coupling mechanism, avoid becoming flexible between plug blade and the contact plate.
Description
Technical Field
The invention relates to the field of power equipment, in particular to a safe and reliable switching device of a power system.
Background
The power equipment refers to various equipment used for power generation, power supply, power transmission and power transformation, wherein a disconnecting link is one of manual switches of the power equipment, is also called a disconnecting link, is generally used for low voltage electricity and is divided into a single-phase disconnecting link and a three-phase disconnecting link.
The existing disconnecting link is impacted by mechanical closing force in the switching-on and switching-off process, a contact is deformed and falls off due to mechanical abrasion, or a screw at the joint of the disconnecting link and a lead is loosened due to long-term wind swing, so that the contact resistance is increased, the internal temperature of the disconnecting link is overhigh, the disconnecting link can be burnt seriously, the safe and stable operation of a power grid is influenced, moreover, the existing disconnecting link mostly has the condition of metal exposure, the electric shock accident is easy to happen, and the safety is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, a safe and reliable switching device of a power system is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a safe and reliable switching device of an electric power system comprises a bottom plate, a blade and two contact plates, wherein the blade is positioned between the two contact plates, the contact plates are perpendicular to the bottom plate, the blade and the contact plates are positioned on the same side of the bottom plate, the blade is obliquely arranged, the contact plates are positioned between the blade and the bottom plate, the minimum distance between the two contact plates is smaller than the thickness of the blade, a protection mechanism is arranged on the bottom plate and is arranged on one side, close to the blade, of the bottom plate, a connecting mechanism is arranged on each of the two contact plates, and the connecting mechanism is positioned on one side, far away from the blade, of each contact plate;
the protective mechanism comprises a fixed pipe, a rotating pipe, a connecting plate, a handle, a hinge assembly and two supporting plates, wherein the fixed pipe is parallel to the bottom plate, the fixed pipe and the rotating pipe are coaxially arranged, the fixed pipe is arranged in the rotating pipe, the outer diameter of the fixed pipe is equal to the inner diameter of the rotating pipe, the connecting plate is arranged in the fixed pipe, the connecting plate is parallel to the bottom plate, the fixed pipe is positioned between the bottom plate and the connecting plate, the connecting plate is fixed on the inner wall of the fixed pipe, the supporting plates are vertical to the bottom plate, the two ends of the fixed pipe are respectively fixedly connected with the two supporting plates, the supporting plates are fixed on the bottom plate, the two ends of the rotating pipe are respectively abutted against the two supporting plates, the brake blade is positioned on one side of the connecting plate, which is far away from the bottom plate, a sliding groove is arranged on the fixed, the gate blade is positioned in the sliding groove, one end of the gate blade is fixedly connected with the inner wall of the rotating tube, the hinge assembly is arranged at the other end of the gate blade and is arranged on one side, far away from the bottom plate, of the connecting plate, the distance between one end, close to the rotating tube, of the gate blade and the bottom plate is larger than the distance between the other end of the gate blade and the bottom plate, the handle is fixed on the rotating tube and is positioned on one side, far away from the bottom plate, of the rotating tube;
coupling mechanism includes slider, movable plate, electro-magnet, two slide bars and two springs, the slider is fixed on the connecting plate, the electro-magnet is fixed in the one side of keeping away from the contact plate of slider, the slide bar is parallel with fixed pipe, the electro-magnet is located between two slide bars, spring and slide bar one-to-one, the slider cover is established on the slide bar, the one end fixed connection of contact plate and slide bar, the other end at the slide bar is fixed to the movable plate, the movable plate is parallel with the contact plate, the movable plate is just to setting up with the electro-magnet, the spring is located between contact plate and the slider, the slider passes through the spring and is connected with the contact plate.
Preferably, the sliding block and the sliding rod are made of insulating materials for improving safety.
Preferably, the sliding rod is coated with a lubricating oil in order to reduce the friction between the sliding rod and the sliding block.
Preferably, in order to realize the function of the rotation of the blade, the hinge assembly comprises a rotating shaft and two bearing seats, the rotating shaft is parallel to the fixed pipe, the two bearing seats are respectively installed at two ends of the rotating shaft, the bearing seats are fixed on the connecting plate, and one end of the blade, far away from the rotating pipe, is fixedly connected with the rotating shaft.
Preferably, in order to fix the rotating pipe, a magnet block and a fixing rod are arranged on the rotating pipe, the fixing rod is perpendicular to the bottom, one end of the fixing rod is fixed on one side, close to the rotating pipe, of the bottom plate, the other end of the fixing rod is abutted against the magnet block, the magnet block is fixed on the rotating pipe, and the fixing pipe is made of iron.
Preferably, in order to realize automation, a contact sensor is arranged on the rotating pipe and is positioned between the bottom plate and the connecting plate, a PLC is arranged on the bottom plate, and the contact sensor and the electromagnet are electrically connected with the PLC.
Preferably, in order to facilitate the contact between the blade and the contact plate, a chamfer is arranged on the contact plate.
Preferably, in order to improve the heat dissipation effect, a through hole and a dust screen are arranged on the supporting plate, the through hole and the fixing pipe are coaxially arranged, the aperture of the through hole is smaller than the inner diameter of the fixing pipe, and the dust screen is arranged in the through hole.
Preferably, the handle is provided with anti-slip threads to avoid slipping.
Preferably, in order to improve sealability, the inner wall of the rotating tube is coated with sealing grease.
The safe and reliable switch device of the power system has the advantages that the safety is improved through the protection mechanism, compared with the existing protection mechanism, the protection mechanism forms a sealed space, the protection is better, in addition, the reliability is improved through the connecting mechanism, the looseness between the gate blade and the contact plate is avoided, compared with the existing connecting mechanism, the connecting mechanism is not limited by the use environment, and the practicability is higher.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the structure of the safety and reliability switchgear of the power system of the present invention;
FIG. 2 is a cross-sectional view of a safety reliable switchgear of the power system of the present invention;
fig. 3 is a schematic structural view of a connection mechanism of a safe and reliable switching device of the power system of the present invention;
FIG. 4 is a schematic structural view of a hinge assembly of the safety and reliability switchgear of the power system of the present invention;
in the figure: 1. the magnetic switch comprises a base plate, 2 parts of a blade, 3 parts of a contact plate, 4 parts of a fixed pipe, 5 parts of a rotating pipe, 6 parts of a connecting plate, 7 parts of a handle, 8 parts of a supporting plate, 9 parts of a sliding block, 10 parts of a moving plate, 11 parts of an electromagnet, 12 parts of a sliding rod, 13 parts of a spring, 14 parts of a rotating shaft, 15 parts of a bearing seat, 16 parts of a magnet block, 17 parts of a fixed rod, 18 parts of a contact sensor and 19 parts of a dust screen.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, a safe and reliable switching device of an electric power system includes a base plate 1, a blade 2 and two contact plates 3, wherein the blade 2 is located between the two contact plates 3, the contact plates 3 are perpendicular to the base plate 1, the blade 2 and the contact plates 3 are located on the same side of the base plate 1, the blade 2 is obliquely arranged, the contact plates 3 are located between the blade 2 and the base plate 1, the minimum distance between the two contact plates 3 is smaller than the thickness of the blade 2, the base plate 1 is provided with a protection mechanism, the protection mechanism is arranged on one side of the base plate 1 close to the blade 2, and both the two contact plates 3 are provided with a connection mechanism, and the connection mechanism is located on one side of the contact plates 3 away from the blade 2;
the two sides of the blade 2 are respectively attached to the two contact plates 3 through operation of a user, the switch device is closed, the connecting mechanism is arranged to prevent the contact plates 3 from loosening from the blade 2, and the protection mechanism is arranged to improve safety.
As shown in fig. 2, the protection mechanism includes a fixed tube 4, a rotating tube 5, a connecting plate 6, a handle 7, a hinge assembly and two supporting plates 8, the fixed tube 4 is parallel to the bottom plate 1, the fixed tube 4 and the rotating tube 5 are coaxially arranged, the fixed tube 4 is arranged in the rotating tube 5, the outer diameter of the fixed tube 4 is equal to the inner diameter of the rotating tube 5, the connecting plate 6 is arranged in the fixed tube 4, the connecting plate 6 is parallel to the bottom plate 1, the fixed tube 4 is located between the bottom plate 1 and the connecting plate 6, the connecting plate 6 is fixed on the inner wall of the fixed tube 4, the supporting plates 8 are perpendicular to the bottom plate 1, two ends of the fixed tube 4 are respectively and fixedly connected with the two supporting plates 8, the supporting plates 8 are fixed on the bottom plate 1, two ends of the rotating tube 5 are respectively abutted against the two supporting plates 8, the guillotine blade 2 is located on one side, the fixed pipe 4 is provided with a sliding chute, the sliding chute is matched with the gate blade 2, the sliding chute is positioned on one side of the connecting plate 6 far away from the bottom plate 1, the gate blade 2 is positioned in the sliding chute, one end of the gate blade 2 is fixedly connected with the inner wall of the rotating pipe 5, the hinge assembly is arranged at the other end of the gate blade 2, the hinge assembly is arranged on one side of the connecting plate 6 far away from the bottom plate 1, the distance between one end of the gate blade 2 close to the rotating pipe 5 and the bottom plate 1 is greater than the distance between the other end of the gate blade 2 and the bottom plate 1, the handle 7 is fixed on the rotating pipe 5, and the handle 7 is positioned on one side of the rotating pipe 5 far away from the bottom plate;
the fixed pipe 4 keeps the relative static position relation through backup pad 8 and bottom plate 1, and the fixed pipe 4 keeps the relative static position relation through connecting plate 6 and contact plate 3, and the user promotes handle 7, makes the rotating tube 5 rotate, and the rotation of rotating tube 5 drives the plug blade 2 and passes through hinge assembly and rotate, makes the both sides of plug blade 2 laminate with two contact plates 3 respectively.
As shown in fig. 3, the connecting mechanism includes a slider 9, a moving plate 10, an electromagnet 11, two sliding rods 12 and two springs 13, the slider 9 is fixed on the connecting plate 6, the electromagnet 11 is fixed on one side of the slider 9, which is far away from the contact plate 3, the sliding rods 12 are parallel to the fixed tube 4, the electromagnet 11 is located between the two sliding rods 12, the springs 13 are in one-to-one correspondence with the sliding rods 12, the slider 9 is sleeved on the sliding rods 12, the contact plate 3 is fixedly connected with one end of the sliding rods 12, the moving plate 10 is fixed at the other end of the sliding rods 12, the moving plate 10 is parallel to the contact plate 3, the moving plate 10 is opposite to the electromagnet 11, the springs 13 are located between the contact plate 3 and the slider 9, the slider 9 is connected with the contact plate 3 through the.
When two sides of the blade 2 are respectively attached to the two contact plates 3, the blade 2 pushes the contact plates 3 to move towards the direction close to the slider 9, the springs 13 are compressed, then the electromagnets 11 are electrified, so that a mutual attraction acting force is generated between the iron moving plate 10 and the electromagnets 11, the moving plate 10 drives the contact plates 3 to move towards the direction close to the blade 2 under the supporting action of the slider 9 through the sliding rods 12, the attaching strength of the contact plates 3 and the blade 2 is improved, when the blade 2 is separated from the contact plates 3, the electromagnets 11 are powered off, and the contact plates 3 are reset under the elastic action of the springs 13.
Preferably, the sliding block 9 and the sliding rod 12 are made of insulating materials for improving safety.
The insulating material is a non-conductive material under the allowable voltage, but is not an absolutely non-conductive material, so that the short circuit phenomenon can be avoided when the contact plate 3 is electrified, and the electricity utilization safety is improved.
Preferably, in order to reduce the friction between the sliding rod 12 and the sliding block 9, the sliding rod 12 is coated with a lubricating oil.
The lubricating oil has the function of reducing the friction force between the sliding rod 12 and the sliding block 9 and improving the moving fluency of the sliding rod 12.
As shown in fig. 4, the hinge assembly includes a rotating shaft 14 and two bearing seats 15, the rotating shaft 14 is parallel to the fixed tube 4, the two bearing seats 15 are respectively installed at two ends of the rotating shaft 14, the bearing seats 15 are fixed on the connecting plate 6, and one end of the blade 2, which is far away from the rotating tube 5, is fixedly connected to the rotating shaft 14.
When the rotating pipe 5 rotates, the blade 2 is driven to rotate under the supporting action of the bearing seat 15 through the rotating shaft 14, and the function of rotating the blade 2 is realized.
Preferably, in order to fix the rotating tube 5, a magnet block 16 and a fixing rod 17 are arranged on the rotating tube 5, the fixing rod 17 is perpendicular to the bottom, one end of the fixing rod 17 is fixed on one side of the bottom plate 1 close to the rotating tube 5, the other end of the fixing rod 17 abuts against the magnet block 16, the magnet block 16 is fixed on the rotating tube 5, and the fixing tube 4 is made of iron.
The magnet block 16 is abutted against the iron fixing rod 17, so that the magnet block 16 is firmly attracted with the fixing rod 17, the rotating tube 5 is prevented from rotating under the action of gravity, and the function of fixing the rotating tube 5 is achieved.
Preferably, in order to realize automation, a contact sensor 18 is arranged on the rotating pipe 5, the contact sensor 18 is located between the bottom plate 1 and the connecting plate 6, a PLC is arranged on the bottom plate 1, and both the contact sensor 18 and the electromagnet 11 are electrically connected with the PLC.
When a user pushes the handle 7 to enable the rotating pipe 5 to rotate, the rotating pipe 5 drives the contact sensor 18 to abut against the bottom plate 1, so that the contact sensor 18 detects signals and transmits the signals to the PLC, the PLC controls the electromagnet 11 to be electrified, and automation is achieved.
Preferably, in order to facilitate the contact between the blade 2 and the contact plate 3, the contact plate 3 is provided with a chamfer.
The chamfer is used for preventing the contact plate 3 from being stuck with the blade 2, so that the contact plate 3 is stuck with the blade 2 conveniently.
Preferably, in order to improve the heat dissipation effect, a through hole and a dust screen 19 are arranged on the support plate 8, the through hole and the fixed pipe 4 are coaxially arranged, the aperture of the through hole is smaller than the inner diameter of the fixed pipe 4, and the dust screen 19 is arranged in the through hole.
Through the through hole, the switch device can discharge the heat inside in the using process conveniently, and the dust can be prevented from entering the fixed pipe 4 from the through hole through the dustproof net 19, so that the dustproof effect is realized.
Preferably, the handle 7 is provided with anti-slip threads to avoid slipping.
The anti-slip lines are used for improving the friction force between the hand part of the using shaft and the handle 7 and avoiding slipping.
Preferably, the inner wall of the rotating tube 5 is coated with a sealing grease for improving sealability.
The effect of sealing grease reduces the space between rotating tube 5 and fixed tube 4, has improved the leakproofness, avoids inside the dust gets into fixed tube 4.
The use method of the switch device comprises the following steps:
the user promotes handle 7, make rotating tube 5 rotate, rotating tube 5's rotation promotes plug blade 2, plug blade 2 drives axis of rotation 14 and rotates under the supporting action of bearing frame 15, thereby plug blade 2 rotates, make the both sides of plug blade 2 laminate with two contact plates 3 respectively, plug blade 2 promotes contact plate 3 and moves towards being close to slider 9 direction, make spring 13 compress, subsequently, electro-magnet 11 circular telegram, make the effort of producing the inter attraction between the moving plate 10 of iron and electro-magnet 11, thereby make moving plate 10 drive contact plate 3 through slide bar 12 under the supporting action of slider 9 and move towards being close to plug blade 2 direction, improve the intensity that contact plate 3 and plug blade 2 laminated, when plug blade 2 and contact plate 3 separated, electro-magnet 11 cuts off the power supply, contact plate 3 resets under the elastic action of spring 13.
Here, make contact plate 3 and plug blade 2 be in a sealed space through fixed tube 4, rotating tube 5 and backup pad 8 to can avoid taking place the electric shock phenomenon, improve the security, through improving the intensity of laminating between contact plate 3 and the plug blade 2, avoid contact plate 3 and plug blade 2 not hard up, reduce contact resistance, reduce this switching device's internal temperature, improve the reliability.
Compared with the prior art, this electric power system's safe and reliable's switching device has improved the security through protection machanism, compares with current protection machanism, and this protection machanism has constituteed a sealed space, and the protection is better each other, and not only, has still improved the reliability through coupling mechanism, avoids becoming flexible between plug blade 2 and the contact plate 3, compares with current coupling mechanism, and this coupling mechanism does not have service environment's restriction, and the practicality is stronger.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A safe and reliable switch device of an electric power system comprises a bottom plate (1), a blade (2) and two contact plates (3), the blade (2) is positioned between two contact plates (3), the contact plates (3) are vertical to the bottom plate (1), the blade (2) and the contact plate (3) are positioned at the same side of the bottom plate (1), the blade (2) is obliquely arranged, the contact plates (3) are positioned between the blade (2) and the bottom plate (1), the minimum distance between the two contact plates (3) is smaller than the thickness of the blade (2), it is characterized in that the bottom plate (1) is provided with a protection mechanism which is arranged on one side of the bottom plate (1) close to the blade (2), the two contact plates (3) are both provided with a connecting mechanism, the connecting mechanism is positioned on one side of the contact plate (3) far away from the blade (2);
the protection mechanism comprises a fixed pipe (4), a rotating pipe (5), a connecting plate (6), a handle (7), a hinge assembly and two supporting plates (8), wherein the fixed pipe (4) is parallel to the bottom plate (1), the fixed pipe (4) and the rotating pipe (5) are coaxially arranged, the fixed pipe (4) is arranged in the rotating pipe (5), the outer diameter of the fixed pipe (4) is equal to the inner diameter of the rotating pipe (5), the connecting plate (6) is arranged in the fixed pipe (4), the connecting plate (6) is parallel to the bottom plate (1), the fixed pipe (4) is positioned between the bottom plate (1) and the connecting plate (6), the connecting plate (6) is fixed on the inner wall of the fixed pipe (4), the supporting plates (8) are vertical to the bottom plate (1), the two ends of the fixed pipe (4) are respectively fixedly connected with the two supporting plates (8), and the supporting plates (8) are fixed on the bottom plate (1), the both ends of rotating tube (5) support with two backup pads (8) respectively and lean on, plug blade (2) are located the one side of keeping away from bottom plate (1) of connecting plate (6), be equipped with the spout on fixed pipe (4), the spout matches with plug blade (2), the spout is located the one side of keeping away from bottom plate (1) of connecting plate (6), plug blade (2) are located the spout, the one end of plug blade (2) and the inner wall fixed connection of rotating tube (5), articulated subassembly sets up the other end at plug blade (2), articulated subassembly sets up the one side of keeping away from bottom plate (1) of connecting plate (6), the distance between the one end that is close to rotating tube (5) of plug blade (2) and bottom plate (1) is greater than the distance between the other end of plug blade (2) and bottom plate (1), handle (7) are fixed on rotating tube (5), the handle (7) is positioned on one side of the rotating pipe (5) far away from the bottom plate (1);
the connecting mechanism comprises a sliding block (9), a moving plate (10), an electromagnet (11), two sliding rods (12) and two springs (13), the sliding block (9) is fixed on a connecting plate (6), the electromagnet (11) is fixed on one side, far away from a contact plate (3), of the sliding block (9), the sliding rod (12) is parallel to a fixed pipe (4), the electromagnet (11) is located between the two sliding rods (12), the springs (13) are in one-to-one correspondence with the sliding rods (12), the sliding block (9) is sleeved on the sliding rods (12), the contact plate (3) is fixedly connected with one end of each sliding rod (12), the moving plate (10) is fixed at the other end of each sliding rod (12), the moving plate (10) is parallel to the contact plate (3), the moving plate (10) is opposite to the electromagnet (11), and the springs (13) are located between the contact plate (3) and the sliding block (9), the sliding block (9) is connected with the contact plate (3) through a spring (13) to drive the moving plate (10) to be made of iron.
2. A safe and reliable switching device for electric power systems according to claim 1, characterized in that the slider (9) and the slide (12) are both of insulating material.
3. A safety and reliable switching device for electric power systems according to claim 1 characterized in that said sliding rod (12) is coated with a lubricating oil.
4. A safe and reliable switching device for an electric power system according to claim 1, wherein the hinge assembly comprises a rotating shaft (14) and two bearing seats (15), the rotating shaft (14) is parallel to the fixed pipe (4), the two bearing seats (15) are respectively installed at both ends of the rotating shaft (14), the bearing seats (15) are fixed on the connecting plate (6), and one end of the guillotine blade (2) far away from the rotating pipe (5) is fixedly connected with the rotating shaft (14).
5. The safe and reliable switching device of the power system as claimed in claim 1, wherein the rotating tube (5) is provided with a magnet block (16) and a fixed rod (17), the fixed rod (17) is perpendicular to the bottom, one end of the fixed rod (17) is fixed on the side of the bottom plate (1) close to the rotating tube (5), the other end of the fixed rod (17) abuts against the magnet block (16), the magnet block (16) is fixed on the rotating tube (5), and the fixed tube (4) is made of iron.
6. A safe and reliable switching device of an electric power system according to claim 1, characterized in that the rotating pipe (5) is provided with a contact sensor (18), the contact sensor (18) is located between the bottom plate (1) and the connecting plate (6), the bottom plate (1) is provided with a PLC, and the contact sensor (18) and the electromagnet (11) are both electrically connected with the PLC.
7. A safety and reliable switching device for electric power systems according to claim 1, characterized in that the contact plate (3) is provided with a chamfer.
8. A safety and reliable switching device for an electric power system as claimed in claim 1, characterized in that the support plate (8) is provided with a through hole and a dust screen (19), the through hole is arranged coaxially with the fixed pipe (4), the aperture of the through hole is smaller than the inner diameter of the fixed pipe (4), and the dust screen (19) is arranged in the through hole.
9. A safety switch device for an electric power system according to claim 1, characterized in that said handle (7) is provided with anti-slip threads.
10. A safety and reliable switching device for electric power systems according to claim 1, characterized in that the inner wall of the rotating tube (5) is coated with a sealing grease.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910087027.1A CN109817483B (en) | 2019-01-29 | 2019-01-29 | Safe and reliable switching device of power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910087027.1A CN109817483B (en) | 2019-01-29 | 2019-01-29 | Safe and reliable switching device of power system |
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| Publication Number | Publication Date |
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| CN109817483A CN109817483A (en) | 2019-05-28 |
| CN109817483B true CN109817483B (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910087027.1A Active CN109817483B (en) | 2019-01-29 | 2019-01-29 | Safe and reliable switching device of power system |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3949918A (en) * | 1974-08-05 | 1976-04-13 | Borden, Inc. | Machine for dispensing uniform lengths of thick plastic film |
| CN100555494C (en) * | 2006-07-17 | 2009-10-28 | 同方威视技术股份有限公司 | High-voltage automatic change-over switch |
| CN203690183U (en) * | 2014-02-28 | 2014-07-02 | 邵千秋 | High-security knife switch |
| DE102016015050A1 (en) * | 2016-12-16 | 2018-06-21 | Johnson Electric Germany GmbH & Co. KG | switching device |
| CN206806249U (en) * | 2017-06-07 | 2017-12-26 | 瑞安市阿汉汽车部件有限公司 | A kind of protection against electric shock magnetic switch |
| CN107946120B (en) * | 2017-12-24 | 2019-06-28 | 浙江柳晶整流器有限公司 | A kind of low-voltage knife switch for avoiding that electric shock accidents occurs |
| CN108022788B (en) * | 2017-12-24 | 2019-06-28 | 乐清市驰林电气有限公司 | A kind of household low pressure knife-like switch that safety in utilization is good |
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Effective date of registration: 20200415 Address after: 071100 Wei Village, Weicun Town, Qingyuan District, Baoding City, Hebei Province Applicant after: HEBEI JIENENG ELECTRICAL EQUIPMENT Co.,Ltd. Address before: 510000, No. 68, No. seven, Zhongshan Road, Liwan District, Guangdong, Guangzhou Applicant before: Meng Litao |
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