阅读说明：本技术 防爆静电接地钳 (Explosion-proof static grounding clamp ) 是由 陆志仁 邵家辉 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,特别是防爆静电接地钳。其特征是：钳口中有接地齿,接地齿连接有常闭防爆磁控开关,所述常闭防爆磁控开关由常闭干簧管、永磁体、弹性件构成,在钳口张开状态,在弹性件的弹力下使常闭干簧管和永磁体接近而处于开路状态,常闭干簧管跨接在接地齿和地线之间,当钳口咬合导体时,所述常闭干簧管和接地齿随动远离所述永磁体而闭合,此时导体和地线导通。有益效果是：在使用该静电接地钳时不产生静电电火花,进一步对人体静电进行安全释放,并且在人体静电释放过程中对人不产生电击感。(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 normally closed anti-explosion magnetic control switch consists of a normally closed reed switch, a permanent magnet and an elastic piece, wherein the normally closed reed switch and the permanent magnet are close to each other and are in an open circuit state under the elastic force of the elastic piece in the opening state of the jaw, the normally closed reed switch is bridged between the grounding tooth and the ground wire, when the jaw is meshed with the conductor, the normally closed reed switch and the grounding tooth are closed along with the movement away from the permanent magnet, and the conductor is conducted with the ground wire. The beneficial effects are that: when the electrostatic grounding clamp is used, electrostatic electric sparks are not generated, human static electricity is further safely released, and electric shock feeling is not generated to people in the human static electricity releasing process.)

1. The utility model provides an explosion-proof static ground connection pincers, includes keeping silent, pincers body spring, tong arm, characterized by: the normally closed anti-explosion magnetic control switch consists of a normally closed reed switch, a permanent magnet and an elastic piece, wherein the normally closed reed switch and the permanent magnet are close to each other and are in an open circuit state under the elastic force of the elastic piece in the opening state of the jaw, the normally closed reed switch is bridged between the grounding tooth and the ground wire, when the jaw is meshed with the conductor, the normally closed reed switch and the grounding tooth are closed along with the movement away from the permanent magnet, and the conductor is conducted with the ground wire.

2. The explosion-proof electrostatic grounding clamp of claim 1, wherein: the installation positions of the normally closed reed pipe and the permanent magnet can be interchanged.

3. The explosion-proof electrostatic grounding clamp of claim 2, wherein: and when the forceps arms of the electrostatic grounding forceps are held by hands until the jaws are opened, the hand-touch electrode and the grounding electrode are certainly contacted and conducted by overcoming the elastic force, so that the hand-touch electrode is grounded to release human body static electricity.

4. The explosion-proof electrostatic grounding clamp of claim 2, wherein: at least one of the forceps arms is provided with a hand touch electrode and a pressure switch, the pressure switch is bridged between the hand touch electrode and the ground wire, the hand touch electrode is attached to a pressure handle of the pressure switch, the touch pressure of the pressure switch is smaller than the elastic force of a forceps body spring, and when the forceps arms of the electrostatic grounding forceps are held by hands until the forceps jaws are opened, the holding force of the hands inevitably overcomes the touch pressure to close and conduct the pressure switch, so that the hand touch electrode is grounded to release the static electricity of a human body.

5. The explosion-proof electrostatic grounding clamp of claim 2, wherein: at least one of the forceps arms is provided with a hand touch electrode and a pressure switch, the pressure switch is bridged between the hand touch electrode and the ground wire, the hand touch electrode and a pressure handle of the pressure switch are kept separated or in zero pressure contact by elasticity, the resultant force of the sum of the elasticity and the touch pressure of the pressure switch is smaller than the elasticity of a forceps body spring, when the forceps arms of the electrostatic grounding forceps are held by hands until the jaws are opened, the holding force of the hands overcomes the resultant force to close and conduct the pressure switch, and the hand touch electrode is grounded to release the static electricity of a human body.

6. The explosion-proof electrostatic grounding clamp of claim 2, wherein: the permanent magnet and the normally open magnetic control switch are kept separated by elasticity to be in an open circuit, the elasticity is smaller than that of a clamp body spring, when the clamp arms of the electrostatic grounding clamp are held by hands until a clamp jaw is opened, the permanent magnet is inevitably close to the normally open magnetic control switch to be conducted, and the grounding of the hand contact electrode is realized to release human static electricity.

7. The explosion-proof electrostatic grounding clamp of claim 2, wherein: the permanent magnet and the normally closed magnetic control switch are kept close to each other by elasticity and can be driven to be in an open circuit, the elasticity is smaller than that of a clamp body spring, when the clamp arms of the electrostatic grounding clamp are held by hands until a clamp jaw is opened, the permanent magnet is inevitably conducted by overcoming the elasticity and keeping away from the normally closed magnetic control switch, and the grounding of the hand contact electrode is realized to release the static electricity of a human body.

8. The explosion-proof electrostatic grounding clamp according to any one of claims 1 to 7, characterized in that: the clamp arms are wrapped with elastic cavities, and the elastic force is provided by the elastic cavities.

9. The explosion-proof electrostatic grounding clamp according to any one of claims 1 to 7, characterized in that: the hand touch electrode is coupled to the jawarms by a spring, the spring being provided by the spring.

10. The explosion-proof electrostatic grounding clamp according to any one of claims 1 to 7, characterized in that: set up the resistance cross-over connection and pass through when the tong arm of hand contact static ground connection pincers to human static predischarge between hand electrode and ground wire resistance value is R, and resistance value R is: 10 megohm-1000 megohm.

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.

The jaw of the scheme adopts a normally closed reed switch to form the explosion-proof electrostatic grounding clamp.

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 eliminate electric sparks possibly generated during grounding operation of the electrostatic grounding clamp.

Because two electric contacts of the reed switch are positioned in the closed space and belong to an explosion-proof device, electric sparks generated by the electric contacts of the reed switch cannot be transmitted to the outside, so that the reed switch is an intrinsic safety explosion-proof device, and further, the outer wall of the reed switch can be made of nonmagnetic materials, such as an aluminum pipe, so that the explosion-proof effect is better. The reed switch adopted by the jaw of the invention is a normally closed reed switch so as to be different from the prior technical scheme.

Furthermore, the reed switch can be popularized to a magnetic control switch, such as a solid switch adopting a Hall device, and further, the reed switch is definitely an explosion-proof magnetic control switch.

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 normally closed anti-explosion magnetic control switch consists of a normally closed reed switch, a permanent magnet and an elastic piece, wherein the normally closed reed switch and the permanent magnet are close to each other and are in an open circuit state under the elastic force of the elastic piece in the opening state of the jaw, the normally closed reed switch is bridged between the grounding tooth and the ground wire, when the jaw is meshed with the conductor, the normally closed reed switch and the grounding tooth are closed along with the movement away from the permanent magnet, and the conductor is conducted with the ground wire.

The explosion-proof static grounding clamp is characterized in that: the installation positions of the normally closed reed pipe and the permanent magnet can be interchanged.

The explosion-proof static grounding clamp is characterized in that: the normally closed reed switch is connected with a resistor R1 in parallel, and pre-discharges the conductor in the process that the electrostatic grounding clamp bites the conductor.

Further, the range of resistance R1: 1 mega ohm to 1000 mega ohm.

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

The explosion-proof static grounding clamp is characterized in that: the spring is a tension spring or a compression spring.

The explosion-proof static grounding clamp is characterized in that: and when the forceps arms of the electrostatic grounding forceps are held by hands until the jaws are opened, the hand-touch electrode and the grounding electrode are certainly contacted and conducted by overcoming the elastic force, so that the hand-touch electrode is grounded to release human body static electricity.

The explosion-proof static grounding clamp is characterized in that: at least one of the forceps arms is provided with a hand touch electrode and a pressure switch, the pressure switch is bridged between the hand touch electrode and the ground wire, the hand touch electrode is attached to a pressure handle of the pressure switch, the touch pressure of the pressure switch is smaller than the elastic force of a forceps body spring, and when the forceps arms of the electrostatic grounding forceps are held by hands until the forceps jaws are opened, the holding force of the hands inevitably overcomes the touch pressure to close and conduct the pressure switch, so that the hand touch electrode is grounded to release the static electricity of a human body.

The explosion-proof static grounding clamp is characterized in that: at least one of the forceps arms is provided with a hand touch electrode and a pressure switch, the pressure switch is bridged between the hand touch electrode and the ground wire, the hand touch electrode and a pressure handle of the pressure switch are kept separated or in zero pressure contact by elasticity, the resultant force of the sum of the elasticity and the touch pressure of the pressure switch is smaller than the elasticity of a forceps body spring, when the forceps arms of the electrostatic grounding forceps are held by hands until the jaws are opened, the holding force of the hands overcomes the resultant force to close and conduct the pressure switch, and the hand touch electrode is grounded to release the static electricity of a human body.

The explosion-proof static grounding clamp is characterized in that: the pressure switch is hermetically wrapped in the elastic cavity 1.

The explosion-proof static grounding clamp is characterized in that: the permanent magnet and the normally open magnetic control switch are kept separated by elasticity to be in an open circuit, the elasticity is smaller than that of a clamp body spring, when the clamp arms of the electrostatic grounding clamp are held by hands until a clamp jaw is opened, the permanent magnet is inevitably close to the normally open magnetic control switch to be conducted, and the grounding of the hand contact electrode is realized to release human static electricity.

The explosion-proof static grounding clamp is characterized in that: the permanent magnet and the normally closed magnetic control switch are kept close to each other by elasticity and can be driven to be in an open circuit, the elasticity is smaller than that of a clamp body spring, when the clamp arms of the electrostatic grounding clamp are held by hands until a clamp jaw is opened, the permanent magnet is inevitably conducted by overcoming the elasticity and keeping away from the normally closed magnetic control switch, and the grounding of the hand contact electrode is realized to release the static electricity of a human body.

The explosion-proof static grounding clamp is characterized in that: the installation positions of the magnetic control switch and the permanent magnet can be interchanged.

The explosion-proof static grounding clamp is characterized in that: the magnetic control switch is an explosion-proof magnetic control switch.

The explosion-proof static grounding clamp is characterized in that: the magnetic control switch is a reed switch.

The explosion-proof static grounding clamp is characterized in that: the clamp arms are wrapped with elastic cavities, and the elastic force is provided by the elastic cavities.

The explosion-proof static grounding clamp is characterized in that: the elastic cavity is made of sub-conductor material, and the resistance value R of the elastic cavity is larger than the resistance value R of the elastic cavity.

The explosion-proof static grounding clamp is characterized in that: the elastic cavity is made of conductive rubber, and the resistance value R of the elastic cavity is larger than the resistance value R of the elastic cavity.

The explosion-proof static grounding clamp is characterized in that: the hand touch electrode is coupled to the jawarms by a spring, the spring being provided by the spring.

The explosion-proof static grounding clamp is characterized in that: the resistance is arranged to be bridged between the hand contact electrode and the ground wire, when the hand contacts the clamp arm of the electrostatic grounding clamp, the resistance is used for pre-discharging the static electricity of the human body, and the resistance value is R.

The explosion-proof static grounding clamp is characterized in that: the resistance value R is: 10 megohm-1000 megohm.

The invention has the beneficial effects that: when the electrostatic grounding clamp is used, electrostatic electric sparks are not generated, human static electricity is further safely released, and electric shock feeling is not generated to people in the human static electricity releasing process.

Drawings

Fig. 1 is a schematic structural view of the present invention (the elastic member is a tension spring).

Fig. 2 is a schematic structural diagram of the present invention (the elastic member is a compression spring).

Fig. 3 is a schematic diagram of the electrical appliance with the grounded jaw.

Fig. 4 is an embodiment of the clamp arm provided with electrode contacts for safely discharging human static electricity.

Fig. 5 is an embodiment of the clamp arm with a pressure switch for safely discharging human static electricity.

Fig. 6 is an embodiment of the forceps arm provided with a normally open reed switch for safely releasing human static electricity.

Fig. 7 is an embodiment of the forceps arm provided with a normally closed reed switch for safely discharging human static electricity.

Fig. 8 shows the design of the hand electrode coupled to the jawarms via the resilient members.

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 elastic member is a tension spring), the electrostatic grounding clamp includes a clamp arm 101, a clamp arm 105, a clamp jaw clamping lip 103, a clamp body spring 102, and an explosion-proof clamp jaw container 104, a movable member 202 is disposed in the explosion-proof clamp jaw container 104, a grounding tooth 201 is disposed at a position of the movable member 202 corresponding to the clamp jaw clamping lip 103, a normally closed dry reed pipe 205 is disposed on the movable member, a permanent magnet 204 is disposed at a position corresponding to the normally closed dry reed pipe 205, the permanent magnet 204 is fixed on the explosion-proof clamp jaw container 104, the normally closed dry reed pipe 205 is tensioned and stopped on the permanent magnet 204 by the elastic force of the tension spring 203 to make the normally closed dry reed pipe 205 in an open circuit state, one end of the normally closed dry reed pipe 205 is connected to the grounding tooth 201, the other end is connected to a ground wire, the sum elastic force of the two tension springs 203 is smaller than the elastic force of the, when the jaw bites the conductor 1000, the grounding tooth 201, the normally closed reed pipe 205 and the moving part 202 follow to be away from the permanent magnet 204, and at the moment, the normally closed reed pipe 205 loses the large magnetic field of the permanent magnet 204 and is closed, so that the conductor 1000 is conducted with the ground wire. Of course, the installation positions of the permanent magnet 204 and the normally closed reed switch can be interchanged.

Fig. 2 is a schematic structural diagram of the present invention (the elastic member is a compression spring), in which the compression spring 2031 is replaced by a tension spring in this embodiment. Of course, the installation positions of the permanent magnet 204 and the normally closed reed switch can be interchanged.

With reference to fig. 1 and 2, a tension spring and a compression spring may be used together.

Fig. 3 is a schematic diagram of the electrical appliance with the grounded jaw.

Fig. 4 is an embodiment of the clamp arm provided with electrode contacts for safely discharging static electricity of a human body, and considering that the human body can carry the static electricity, even if the grounding clamp is intrinsically safe, the personnel still can generate electric sparks in an explosion-proof environment to cause unsafe hidden troubles. The elastic cavity 1051 is arranged or wrapped on at least one tong arm of the electrostatic grounding tong, the hand touch electrode 301 is arranged on the elastic cavity 1051, the grounding electrode 302 is arranged in the elastic cavity 1051, the hand touch electrode 301 and the grounding electrode 302 are kept separated by the elastic force F of the elastic cavity 1051, the elastic force F is smaller than the elastic force F of a tong body spring, when the tong arm of the electrostatic grounding tong is held by a hand until a tong mouth is opened, the hand touch electrode 301 and the grounding electrode 302 are certainly contacted and conducted by overcoming the elastic force F, the grounding of the hand touch electrode 301 is realized to release the static electricity of a human body, and the elastic cavity 1051 has a sealing function, so the hand touch electrode 301 and the grounding electrode 302 are sealed in the elastic cavity 1051 even if sparks are generated, and the explosion-proof clamp. Here, the caliper arm 101 is covered with an insulating material to prevent the human body from being directly grounded. Considering the electrostatic grounding concept, the leakage resistance is 10 megohm-1000 megohm, and actually, the resistance of several megohms is equivalent to direct grounding (zero resistance grounding easily generates electrostatic spark), a resistor R can be set to bridge between the hand touch electrode 301 and the ground wire, and the resistance value is: 10 megohm-1000 megohm. When a hand holds the clamp arm of the electrostatic grounding clamp, the electrostatic pre-release is carried out through the hand touch electrode 301 and the resistor R, 70% of human body voltage can be pre-released in about 3 seconds according to an RC discharge curve, the human body capacitance is generally 200pF, the human body resistance is 10 kilo ohm, the resistance value of the resistor R is 330 mega ohm, the electrostatic pre-release is basically completed after 3 seconds according to the RC curve, meanwhile, no touch inductance is generated on the human body, the residual voltage is less than 100 volts, when the clamp arm of the electrostatic grounding clamp is held by the hand until a clamp jaw is opened, the hand touch electrode 301 and the grounding electrode 302 are inevitably contacted and conducted by overcoming the elastic force f, the human body is directly grounded to release the residual voltage, the residual voltage is very low, the touch inductance cannot be generated on the human body, meanwhile, the low residual voltage release is intrinsically safe (the energy is less than 0.28 mJ), namely, even if the elastic.

In addition, as an implementation scheme, the elastic cavity 1051 is made of a sub-conductor material, such as conductive rubber or plastic, and the ground resistance of the sub-conductor material is 10 mega ohm to 1000 mega ohm.

In addition, since the breakdown voltage of air is about 3kv/mm, it is desirable to design the distance between the hand touch electrode 301 and the ground electrode 302 to be greater than 3mm in most cases.

Fig. 5 shows an embodiment in which the clamp arms are provided with pressure switches to safely discharge human static electricity, an elastic cavity 1051 is arranged on or wrapped around at least one clamp arm of the electrostatic grounding clamp, the hand touch electrode 301 is arranged on the elastic cavity 1051, the pressure switch K is arranged in the elastic cavity 1051, the pressure switch is triggered and conducted by the pressure exerted on the pressure handle, the triggering pressure is set as F1, the pressure switch K is bridged between the hand touch electrode 301 and the ground wire, the hand touch electrode 301 and the pressure handle of the pressure switch are kept away or in zero pressure contact by the elastic force F of the elastic cavity 1051, the resultant force of the sum of the elastic force F and the triggering pressure F1 is less than the elastic force F of the clamp body spring, when the forceps arms of the electrostatic grounding forceps are held by hands until the forceps jaws are opened, the pressure switch K is closed and conducted by overcoming the resultant force of the sum of the elastic force f + the touch pressure f1, and the hand touch electrode 301 is grounded to release human body static electricity. Further, pressure switch K is wrapped up by sealed elasticity cavity 3000, constitutes flame-proof type pressure switch like this. Here, the caliper arm 101 is covered with an insulating material to prevent the human body from being directly grounded. Considering the electrostatic grounding concept, the leakage resistance is 10 megohm-1000 megohm, and actually, the resistance of several megohms is equivalent to direct grounding (zero resistance grounding easily generates electrostatic spark), a resistor R can be set to bridge between the hand touch electrode 301 and the ground wire, and the resistance value is: 10 megohm-1000 megohm. When a hand holds the clamp arm of the electrostatic grounding clamp, the electrostatic pre-release is carried out through the hand touch electrode 301 and the resistor R, 70% of human body voltage can be pre-released in about 3 seconds according to an RC discharge curve, the human body capacitance is generally 200pF, the human body resistance is 10 kilo ohm, the resistance value of the resistor R is 330 mega ohm, the electrostatic pre-release is basically completed after 3 seconds according to the RC curve, meanwhile, no touch inductance is generated on the human body, the residual voltage is less than 100 volts, when the clamp arm of the electrostatic grounding clamp is held by the hand until a clamp jaw is opened, the pressure switch is necessarily closed and conducted, the human body is directly grounded to release the residual voltage, the residual voltage is very low, no touch inductance is generated on the human body, meanwhile, the low residual voltage release is intrinsically safe (the energy is less than 0.28 mJ), namely, even if the elastic cavity 1051 is not sealed, and the elastic cavity 3000.

Alternatively, as an embodiment, the reset can be achieved by directly using the touch pressure f1 of the pressure spring, i.e. the hand touch electrode 301 is directly attached to the pressure handle of the pressure switch, and then the sexual cavity 1051 can be removed.

In addition, as an implementation scheme, the elastic cavity 1051 is made of a sub-conductor material, such as conductive rubber or plastic, and the ground resistance of the sub-conductor material is 10 mega ohm to 1000 mega ohm.

Fig. 6 is an embodiment of arranging a normally open reed switch on a forceps arm to safely release human static electricity, an elastic cavity 1051 is arranged on or wrapped around at least one forceps arm of an electrostatic grounding forceps, a hand contact electrode 301 is arranged on the elastic cavity 1051, a permanent magnet 401 is arranged on the elastic cavity 1051, a normally open reed switch 402 is arranged in the elastic cavity 1051, the hand contact electrode 301 and the permanent magnet 401 are mounted together and can follow, the permanent magnet 401 and the normally open reed switch 402 are kept separated by an elastic force F of the elastic cavity 1051 to be open, the elastic force F is smaller than an elastic force F of a forceps body spring, when the forceps arm of the electrostatic grounding forceps is held by a hand until a forceps jaw is opened, the permanent magnet 401 is necessarily close to the normally open reed switch 402 to be conductive, and the hand contact electrode 301 is grounded to release human static electricity. Here, the caliper arm 101 is covered with an insulating material to prevent the human body from being directly grounded. Considering the electrostatic grounding concept, the leakage resistance is 10 megohm-1000 megohm, and actually, the resistance of several megohms is equivalent to direct grounding (zero resistance grounding easily generates electrostatic spark), a resistor R can be set to bridge between the hand touch electrode 301 and the ground wire, and the resistance value is: 10 megohm-1000 megohm. When a clamp arm of the electrostatic grounding clamp is held by a hand, electrostatic pre-release is carried out through a hand touch electrode 301 and a resistor R, 70% of human body voltage can be pre-released in about 3 seconds according to an RC discharge curve, the human body capacitance is generally 200pF, the human body resistance is 10 kilo-ohm, the resistance value of the resistor R is 330 mega-ohm, electrostatic pre-release is basically completed after 3 seconds according to the RC curve, meanwhile, no touch inductance is generated on a human body, the residual voltage is less than 100 volts, when the clamp arm of the electrostatic grounding clamp is held by the hand until a clamp jaw is opened, a permanent magnet 401 is inevitably close to a normally open reed 402 to close and conduct the normally open reed 402, the human body is directly grounded to release the residual voltage, the residual voltage is very low, and no touch inductance is generated on the.

Considering that the permanent magnet 401 and the normally open reed pipe 402 constitute a proximity switch, the installation positions of the permanent magnet 401 and the normally open reed pipe 402 can be interchanged.

In addition, as an implementation scheme, the elastic cavity 1051 is made of a sub-conductor material, such as conductive rubber or plastic, and the ground resistance of the sub-conductor material is 10 mega ohm to 1000 mega ohm.

Fig. 7 is an embodiment of providing a normally closed dry reed pipe for a forceps arm to safely discharge human static electricity, considering that a proximity switch may also be implemented by the normally closed dry reed pipe, an elastic cavity 1051 is provided or wrapped on at least one forceps arm of an electrostatic grounding forceps, a hand touch electrode 301 is provided on the elastic cavity 1051, a permanent magnet 401 is fixedly provided in the elastic cavity 1051 through a connecting part 4022, a normally closed dry reed pipe 4021 is further provided in the elastic cavity 1051, the hand touch electrode 301 and the permanent magnet 401 are connected together through the connecting part 4022 and can follow up, the permanent magnet 401 and the normally closed dry reed pipe 4021 are kept close to each other by an elastic force F of 1051 and are open, the elastic force F is smaller than an elastic force F of a forceps body spring, when the forceps arm of the electrostatic grounding forceps is held by a hand until a forceps jaw is opened, the permanent magnet 401 is necessarily far away from the normally closed dry reed pipe to conduct, and the hand touch. Here, the caliper arm 101 is covered with an insulating material to prevent the human body from being directly grounded. Considering the electrostatic grounding concept, the leakage resistance is 10 megohm-1000 megohm, and actually, the resistance of several megohms is equivalent to direct grounding (zero resistance grounding easily generates electrostatic spark), a resistor R can be set to bridge between the hand touch electrode 301 and the ground wire, and the resistance value is: 10 megohm-1000 megohm. When a clamp arm of the electrostatic grounding clamp is held by a hand, electrostatic pre-release is carried out through a hand touch electrode 301 and a resistor R, 70% of human body voltage can be pre-released in about 3 seconds according to an RC discharge curve, a human body capacitor is generally 200pF, a human body resistor is 10 kilo-ohm, a resistor R is taken as 330 mega-ohm, electrostatic pre-release is basically completed after 3 seconds according to the RC curve, meanwhile, no touch inductance is generated on a human body, the residual voltage is less than 100 volts, when the clamp arm of the electrostatic grounding clamp is held by the hand until a clamp jaw is opened, a permanent magnet 401 is inevitably far away from a normally closed reed 4021 to close and conduct the normally closed reed 4021, the human body is directly grounded to release the residual voltage, the residual voltage is very low, and no touch inductance is generated on the human.

Considering that the permanent magnet 401 and the normally open reed switch 4021 form an exit switch, the installation positions of the permanent magnet 401 and the normally closed reed switch 4021 can be interchanged.

In addition, as an implementation scheme, the elastic cavity 1051 is made of a sub-conductor material, such as conductive rubber or plastic, and the ground resistance of the sub-conductor material is 10 mega ohm to 1000 mega ohm, and the sub-conductor elastic cavity can replace the resistor R, and certainly, the resistor R can be still arranged

Fig. 8 shows a design scheme of coupling the hand touch electrode with the clamp arm through an elastic member, in this case, the elastic member in the embodiments of fig. 4, 5, 6 and 7 provides the restoring force of the grounding switch by the elasticity of the elastic cavity 1051, so that an elastic member may be used instead, the hand touch electrode 301 is coupled with the clamp arm through an elastic member 3011, the elastic force f is provided by an elastic member, such as a spring, a spring plate, etc., in the design, it should be considered that the hand touch electrode 301 should be insulated from the ground wire, which is a routine process for those skilled in the art, and fig. 8 is described by taking the embodiment of fig. 4 as an example, and the design scheme is also applicable to the schemes described in fig. 5, 6 and 7.

In addition, the embodiment of fig. 4, 5, 6, 7, and 8 actually discloses an electrostatic grounding clamp capable of safely discharging human body static electricity, which is characterized in that based on the design of the clamp arm of the clamp body spring, the determined event of human body grounding is ensured by using the characteristic that the elasticity of the clamp body spring is greater than the required elasticity of the grounding switch, and the large clamp jaw form of the electrostatic grounding clamp capable of safely discharging human body static electricity can be: the traditional jaw, or the jaw formed by adopting a normally closed reed pipe in the case, or the jaw formed by adopting a normally open reed pipe in CN 200810123358.8.

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, in consideration of the pressure resistance of the reed switch, a vacuum reed switch can be adopted and the gap between electrodes is enlarged, and alternatively, the reed switch can be filled with insulating pressure-resistant oil to form an oil-immersed reed switch, for example, transformer oil is adopted, the electric strength of the transformer oil can reach more than 4000kV/cm, the components of the transformer oil mainly comprise naphthene, alkane and aromatic hydrocarbon, and the relative dielectric constant of the transformer oil is between 2.2 and 2.4. The oil-immersed reed switch has the advantages that opening or closing is delayed, for the scheme, the delayed closing of the normally-open reed switch is beneficial to prolonging the time of electrostatic pre-release of a human body, and the delayed closing of the normally-closed reed switch is beneficial to the stable occlusion state of the electrostatic grounding clamp (namely, the normally-closed reed switch is closed and conducted after the grounding tooth and the conductor are stably connected).

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.