阅读说明：本技术 一种防爆静电接地钳 (Explosion-proof static ground connection pincers ) 是由 王彦杰 顾裕宁 吴凡 于 2020-04-24 设计创作，主要内容包括：本发明涉及静电释放消除的技术领域,特别是一种防爆静电接地钳。其特征是：钳口中设置有接触电极、隔离罩,所述接触电极位于隔离罩内,当接地钳咬合导体时首先所述隔离罩和导体接触并形成密封腔和外空间隔离,接地钳继续咬合导体直至所述接触电极和导体接触导通而实现接地。有益效果是：在使用该静电接地钳时可以隔离可能产生的静电电火花实现防爆效果。(The invention relates to the technical field of static discharge elimination, in particular to an explosion-proof static grounding clamp. The method is characterized in that: the contact electrode and the isolation cover are arranged in the jaw, the contact electrode is positioned in the isolation cover, when the grounding clamp bites the conductor, the isolation cover is firstly contacted with the conductor to form a sealed cavity and an external space for isolation, and the grounding clamp continues to bite the conductor until the contact electrode is in contact conduction with the conductor to realize grounding. The beneficial effects are that: when the electrostatic grounding clamp is used, electrostatic electric sparks which are possibly generated can be isolated, and an explosion-proof effect is achieved.)

1. The utility model provides an explosion-proof static ground connection pincers, includes keeping silent, pincers body spring, tong arm, characterized by: the contact electrode and the isolation cover are arranged in the jaw, the contact electrode is positioned in the isolation cover, when the grounding clamp bites the conductor, the isolation cover is firstly contacted with the conductor to form a sealed cavity and an external space for isolation, and the grounding clamp continues to bite the conductor until the contact electrode is in contact conduction with the conductor to realize grounding.

2. The explosion-proof electrostatic grounding clamp of claim 1, wherein: the isolation cover is made of sub-conductor elastic material.

3. The explosion-proof electrostatic grounding clamp of claim 2, wherein: the sub-conductor elastic material is conductive rubber.

4. The explosion-proof electrostatic grounding clamp of claim 1, wherein: the isolation cover is made of insulating elastic material.

5. The explosion-proof electrostatic grounding clamp of claim 1, wherein: the isolation cover is composed of an elastic piece and an isolation sleeve.

6. The explosion-proof electrostatic grounding clamp of claim 5, wherein: the isolation sleeve is made of hard sub-conductor material.

7. The explosion-proof electrostatic grounding clamp of claim 5, wherein: the spacer sleeve is made of a hard insulating material.

8. The explosion-proof electrostatic grounding clamp of claim 5, wherein: the elastic element is a spring.

9. The explosion-proof electrostatic grounding clamp of claim 2, 3 or 6, wherein: the sub-conductor material has a resistance value of 1 kiloohm-1000 megohm.

10. The explosion-proof electrostatic grounding clamp according to any one of claims 1 to 8, characterized in that: the clamp arm is also provided with a contact electrode, a sub-conductor elastic isolation cover, a grounding electrode, a hand-touch electrode and an elastic piece, the hand-touch electrode is connected with the contact electrode, the hand-touch electrode is connected to the clamp arm through the elastic piece, the contact electrode is kept to be separated from the grounding electrode by the elastic force F of the elastic piece, the sum of the elastic force F and the elastic force of the sub-conductor elastic isolation cover is smaller than the elastic force F of a clamp body spring, when the clamp arm of the electrostatic grounding clamp is held by a hand until a clamp jaw is opened, the contact electrode overcomes the elastic force F to compress the sub-conductor elastic isolation cover, the sub-conductor elastic isolation cover is contacted with the grounding electrode to pre-release the static electricity of a human body, the sub-conductor elastic isolation cover is further compressed to contact the contact electrode and the.

Technical Field

The invention relates to the technical field of static discharge elimination, in particular to an explosion-proof static grounding clamp.

Background

At present, the static grounding tongs comprise a grounding tooth mouth, a tong body spring, a tong arm and the like, when a fully loaded oil tank car unloads oil, static carried by the oil tank car (the oil tank car generally has a ground capacitance of about 1500PF, and the static generated by the friction between wheels and the ground has about 2-3 KV) is contacted with the conventional grounding tongs, and an electric arc generated at the moment of meshing of the grounding tooth mouth can cause harm in an explosion area. CN200810123358.8 discloses an explosion-proof electrostatic grounding clamp applying normally open reed pipe: including the pincers body, pincers body large spring installs on the pincers body, and the characteristic is: the insulating sheath is sleeved on the plier body, the small springs are arranged in the plier opening shell, the permanent magnet steel is arranged between the small springs, the vacuum reed pipe is arranged in the insulating part, the insulating part is arranged in the plier body and is fastened with the plier body by the fixing bolt, the insulating gasket between the fixing bolt and the plier body is arranged in the plier body, and the plier opening toothed plate is arranged on the plier opening shell.

Disclosure of Invention

The intrinsic safety is derived from the GB 3836.4-201 standard, explosion-proof electrical appliances are classified into explosion-proof type, safety-increasing type, intrinsic safety type and the like, and the intrinsic safety type electrical equipment is characterized in that all circuits are intrinsic safety circuits, namely, the circuits cannot ignite specified explosive mixtures due to electric sparks and thermal effects generated under normal work or specified fault states. That is, the electric appliance is not explosion-proof by the outer shell and the filler, but the energy of electric spark or heat effect generated by the circuit in normal use or failure is less than 0.28mJ, namely the gas concentration is 8.5% (the most explosive concentration) of the minimum ignition energy.

The invention aims to isolate electric sparks possibly generated during grounding operation of the electrostatic grounding clamp.

The technical scheme of the invention is as follows:

the utility model provides an explosion-proof static ground connection pincers, includes keeping silent, pincers body spring, tong arm, characterized by: the contact electrode and the isolation cover are arranged in the jaw, the contact electrode is positioned in the isolation cover, when the grounding clamp bites the conductor, the isolation cover is firstly contacted with the conductor to form a sealed cavity and an external space for isolation, and the grounding clamp continues to bite the conductor until the contact electrode is in contact conduction with the conductor to realize grounding.

The explosion-proof static grounding clamp is characterized in that: the isolation cover is made of sub-conductor elastic material.

The explosion-proof static grounding clamp is characterized in that: the sub-conductor elastic material is conductive rubber.

The explosion-proof static grounding clamp is characterized in that: the isolation cover is made of insulating elastic material.

The explosion-proof static grounding clamp is characterized in that: the isolation cover is composed of an elastic piece and an isolation sleeve.

The explosion-proof static grounding clamp is characterized in that: the isolation sleeve is made of hard sub-conductor material.

The explosion-proof static grounding clamp is characterized in that: the spacer sleeve is made of a hard insulating material.

The explosion-proof static grounding clamp is characterized in that: the elastic element is a spring.

The explosion-proof static grounding clamp is characterized in that: the sub-conductor material has a resistance value of 1 kiloohm-1000 megohm.

The explosion-proof static grounding clamp is characterized in that: the clamp arm is also provided with a contact electrode, a sub-conductor elastic isolation cover, a grounding electrode, a hand-touch electrode and an elastic piece, the hand-touch electrode is connected with the contact electrode, the hand-touch electrode is connected to the clamp arm through the elastic piece, the contact electrode is kept to be separated from the grounding electrode by the elastic force F of the elastic piece, the sum of the elastic force F and the elastic force of the sub-conductor elastic isolation cover is smaller than the elastic force F of a clamp body spring, when the clamp arm of the electrostatic grounding clamp is held by a hand until a clamp jaw is opened, the contact electrode overcomes the elastic force F to compress the sub-conductor elastic isolation cover, the sub-conductor elastic isolation cover is contacted with the grounding electrode to pre-release the static electricity of a human body, the sub-conductor elastic isolation cover is further compressed to contact the contact electrode and the. Furthermore, the sub-conductor elastic isolation cover has a resistance value of 10 megohm to 1000 megohm.

The invention has the beneficial effects that: when the electrostatic grounding clamp is used, electrostatic electric sparks which are possibly generated can be isolated, and an explosion-proof effect is achieved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Fig. 2 is an embodiment of the shield of the present invention comprised of an elastomeric member and a spacer sleeve.

Fig. 3 is an embodiment of the invention for increasing the human body static electricity safety release function.

Fig. 4 shows an embodiment of the human body electrostatic safety release device formed by the contact electrode and the isolation cover of the invention applied to a traditional electrostatic grounding clamp.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of the present invention, the electrostatic grounding clamp includes clamp arms 101, 105, a clamp body spring 102, a clamp jaw, clamp jaw clamping lips 103, 104 constitute the clamp jaw, a contact electrode 201, an isolation cover 202 are arranged in the clamp jaw, the contact electrode 201 is located in the isolation cover 202, when the grounding clamp bites the conductor 1000, the isolation cover 202 contacts the conductor 1000 first and forms a sealed cavity and an external space isolation, the elastic force of the clamp body spring 102 is greater than the elastic force of the isolation cover 202, the grounding clamp continues to bite the conductor 1000 until the contact electrode 201 and the conductor 1000 are in contact conduction to realize grounding, so that the electrostatic spark is enclosed in the isolation cover to realize the explosion-proof effect.

The cage may be made of an insulating elastomeric material such as rubber, plastic, etc.

In addition, as an implementation scheme, the isolation hood is made of a sub-conductor elastic material, the sub-conductor elastic material is made of conductive rubber or conductive plastic, the resistance value is 1 kilo ohm-1000 mega ohm, therefore, when the isolation hood is in contact with the conductor, pre-discharge is carried out through the resistance of the sub-conductor elastic material, the energy of the pre-discharge is less than 0.28mJ, the explosion-proof requirement can be met, further, when the contact electrode is in contact with the conductor, the energy to be released is reduced, and a better explosion-proof effect is achieved.

Fig. 2 shows an embodiment of the shield according to the present invention, which is composed of an elastic member 301 and a spacer 302, wherein the spacer may be made of a hard insulating material, and the elastic member may be a spring.

In addition, as an implementation scheme, the isolation hood is made of a sub-conductor hard material, the sub-conductor hard material is made of conductive plastic, the resistance value is 1 kilo ohm-1000 mega ohm, therefore, when the isolation hood is in contact with the conductor, pre-discharge is carried out through the resistance of the sub-conductor hard material, the energy of the pre-discharge is less than 0.28mJ, the explosion-proof requirement can be met, further, when the contact electrode is in contact with the conductor, the energy to be released is reduced, and a better explosion-proof effect is achieved.

Fig. 3 is an embodiment of the present invention for increasing the safety discharge function of human static electricity, and considering that human body itself may have static electricity, even though the grounding clamp is intrinsically safe, the personnel still may generate electric spark to cause unsafe hidden trouble in the explosion-proof environment. At least one clamp arm of the electrostatic grounding clamp is provided with a contact electrode 2011, a shielding cover 2021, a grounding electrode 402, a hand contact electrode 401 and an elastic piece 404, the hand contact electrode 401 is connected with the contact electrode 2011, the hand contact electrode 401 is connected on the clamp arm 105 through the elastic piece 404, the contact electrode 2011 is kept separated from the grounding electrode 402 by the elastic force F of the elastic piece 404, the sum of the elastic force F + the elastic force of the shielding cover 2021 is less than the elastic force F of a clamp body spring, when the forceps arms of the electrostatic grounding forceps are held by hands until the forceps jaws are opened, the contact electrode 2011 inevitably overcomes the elastic force f to compress the isolation cover 2021, and further the contact electrode 2011 is contacted with the grounding electrode 402 by compressing the isolation cover 2021, so that the hand contact electrode 401 is grounded to release the static electricity of the human body, due to the sealing function of the shield 2021, the contact electrode 2011 and the ground electrode 402 are in contact with each other, even if sparks are generated, and are sealed in the shield 2021, so that the explosion-proof structure is provided. Considering the electrostatic grounding concept, the leakage resistance is 10 mega ohm to 1000 mega ohm, and actually the resistance of several mega ohm is equivalent to direct grounding (zero resistance grounding is easy to generate electrostatic spark), the isolation cover 2021 is made of sub-conductor elastic material, such as conductive rubber or conductive plastic, with the resistance value of 10 mega ohm to 1000 mega ohm, so that pre-discharge is performed through the resistance of the sub-conductor elastic material when the isolation cover 2021 and the grounding electrode 402 are in contact. When the electrostatic grounding clamp arm is held by hand, the shielding cover 2021 is firstly contacted with the grounding electrode 402, electrostatic pre-discharge is carried out through the resistance of the hand-touch electrode 401 and the shielding cover 2021, according to the RC discharge curve, 70% of human body voltage can be pre-released in about 3 seconds, the human body capacitance is generally 200pF, the human body resistance is 10 kilo-ohm, the resistance value of the isolation cover 2021 is 330 mega-ohm, the electrostatic pre-discharge is basically completed after 3 seconds according to the RC curve, meanwhile, no touch inductance is generated to human bodies, the residual voltage is less than 100 volts, when the forceps arms of the electrostatic grounding forceps are held by hands until the forceps jaws are opened, the residual voltage of the human body is released through the hand-touch electrode 401, the contact electrode 2011 and the grounding electrode 402, the residual voltage is very low, no touch inductance is generated to the human body, at the same time, the low residual voltage discharge is intrinsically safe (energy less than 0.28 mJ), i.e. even if the insulating hood 2021 is not sealed.

In addition, since the breakdown voltage of air is about 3kv/mm, it is desirable to design the distance between the contact electrode 2021 and the ground electrode 402 to be greater than 3mm in most cases.

Fig. 4 shows an embodiment of applying the device for releasing electrostatic charges from human body, which is composed of the contact electrode and the shielding case of the present invention, to a conventional electrostatic grounding clamp, and includes a clamp arm 101, a clamp arm 105, a clamp spring 102, and a clamp jaw, wherein the clamp jaw has a grounding tooth 403, the clamp arm is provided with a contact electrode 2011, a sub-conductor elastic shielding case 2021, a grounding electrode 402, a hand-touch electrode 401, and an elastic member 404, the hand-touch electrode 401 is connected to the contact electrode 2011, the hand-touch electrode 401 is connected to the clamp arm 105 through the elastic member 404, the contact electrode 2011 is kept separated from the grounding electrode 402 by the elastic force F of the elastic member 404, the sum of the elastic force F + the elastic force of the sub-conductor elastic shielding case 2021 is smaller than the elastic force F of the clamp spring, when the clamp arm of the electrostatic grounding clamp is manually moved until the clamp jaw 2011 is opened, the sub-conductor elastic shielding case 2021 is compressed by overcoming the elastic force F, during, further, the contact electrode 2011 and the grounding electrode 402 are contacted by compressing the sub-conductor elastic isolation cover 2021, so that the grounding of the hand touch electrode 401 is realized, and the static electricity of the human body is completely released. Furthermore, the sub-conductor elastic isolation cover 2021 has a resistance value of 10 mega ohm to 1000 mega ohm.

Therefore, the embodiment of fig. 4 can form an independent technical solution, the isolation hood 2021 is made of sub-conductor elastic material to form a sub-conductor elastic isolation hood, that is, an electrostatic grounding clamp for safely releasing human body static electricity, which includes a clamp arm 5, a clamp body spring, and a clamp jaw, and is characterized in that: the clamp arm is provided with a contact electrode, a sub-conductor elastic isolation cover, a grounding electrode, a hand-touch electrode and an elastic piece, the hand-touch electrode is connected with the contact electrode, the hand-touch electrode is connected to the clamp arm through the elastic piece, the contact electrode is kept to be separated from the grounding electrode by the elastic force F of the elastic piece, the sum of the elastic force F and the elastic force of the sub-conductor elastic isolation cover is smaller than the elastic force F of a clamp body spring, when the clamp arm of the electrostatic grounding clamp is held by a hand until a clamp jaw is opened, the contact electrode inevitably overcomes the elastic force F to compress the sub-conductor elastic isolation cover, the sub-conductor elastic isolation cover is contacted with the grounding electrode to pre-release the static electricity of a human body, the sub-conductor elastic isolation cover is further compressed to contact the contact electrode and. Furthermore, the sub-conductor elastic isolation cover has a resistance value of 10 megohm to 1000 megohm.

In addition, a glow discharge tube can be arranged in the electrostatic discharge loop to display the discharge process of the static electricity (in the case of meeting the explosion-proof requirement, such as explosion-proof neon bubbles).

In addition, the isolation cover can be made of gas-generating arc-extinguishing materials, arc-extinguishing gas is generated when the electrodes are subjected to electric spark to realize arc extinguishing, and the gas-generating arc-extinguishing materials comprise: polyamide arc extinguishing composite material, aminoplast, acetal resin, organic glass, red vulcanized paper, reverse white paper and the like.

The resistance value of the resistor provided by the invention can be understood as a recommended value, the protection range of the resistor is not necessarily limited, and the reference implementation is specifically carried out according to the standard of the related industry, such as GB4385-1995 (the recommended value is 100k omega-1000M omega), GB/T11210 2014 (the recommended value is not more than 300M omega), GJB 2605 1996, GB 12014 1989, and the industry standard SY/T7354-2017 (the recommended value is 10 Megaohm-1000 MegaOhm).

The above application modes and rules do not limit the basic features of the method and application of the present invention, and do not limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.