An intrinsically safe explosion-proof electrostatic grounding clamp

Abstract

The present invention relates to the technical field of electrostatic discharge elimination, and in particular to an intrinsically safe, explosion-proof, electrostatic grounding clamp. The clamp is characterized in that at least one clamp arm is provided with a normally closed tactile switch, which is connected between the grounding teeth and the grounding wire. When the clamp arm of the electrostatic grounding clamp is grasped, the normally closed tactile switch responds and opens. Continued grasping of the clamp arm until the jaws open causes the grounding teeth to engage the conductor. During the engagement process, the normally closed tactile switch remains in an open state. After engagement is complete, the grounding teeth and conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed tactile switch closes and conducts, completing the grounding operation. Advantageously, the use of the electrostatic grounding clamp does not generate static sparks, further safely discharges static electricity from the human body, and does not produce a shock sensation during the static discharge process.

Description

Technical Field

[0001] The invention relates to the technical field of static discharge elimination, in particular to an intrinsically safe explosion-proof static grounding clamp. Background Art

[0002] Currently, an electrostatic grounding clamp consists of a grounding jaw, a jaw spring, and a clamp arm. When a fully loaded tank truck is unloading oil, its static electricity (a tank truck typically has a ground capacitance of approximately 1500 pF, with the static electricity generated by friction between the wheels and the ground reaching approximately 2-3 kV) comes into contact with a conventional grounding clamp. The arc generated at the moment the grounding jaws engage is sufficient to cause damage within the explosion zone. CN200810123358.8 discloses an explosion-proof electrostatic grounding clamp with a vacuum reed switch. The clamp comprises a jaw body and a large jaw spring mounted on the jaw body. The clamp features an insulating sheath mounted on the jaw body, small springs mounted within the jaw housing, and permanent magnets positioned between the small springs. A vacuum reed switch is mounted within an insulating member, which is mounted within the jaw body. The insulating member is secured to the jaw body by a fixing bolt. An insulating washer is positioned within the jaw body between the fixing bolt and the jaw body, and a jaw jaw plate is mounted on the jaw housing. However, there is a problem with CN200810123358.8. When the jaws of the grounding clamp bite the conductor, the reed switch is triggered to conduct, and the engaging process is still in progress. That is to say, stable grounding is not achieved when the reed switch is conducting. Thus, the unstable grounding state may cause sparks. Summary of the Invention

[0003] Intrinsically safe electrical equipment is classified according to the GB3836.4-201 standard, which categorizes explosion-proof electrical appliances into flameproof, increased safety, and intrinsically safe types. Intrinsically safe electrical equipment is characterized by its entire circuit being intrinsically safe. This means that neither the sparks nor the thermal effects generated during normal operation or under specified fault conditions can ignite a specified explosive mixture. This means that these appliances rely not on explosion-proofing through their casing or fillings, but rather on ensuring that the energy of the sparks or thermal effects generated during normal operation or under specified fault conditions is less than 0.28mJ, equivalent to the minimum ignition energy at a gas concentration of 8.5% (the most explosive concentration).

[0004] The purpose of the present invention is to conduct grounding only after the grounding teeth of the grounding clamp stably bite the conductor (stable bite of the conductor means no longer moving), so as to reliably eliminate the electric sparks that may be generated during the grounding operation of the electrostatic grounding clamp.

[0005] Since the two electrical contacts of the reed switch are located in a closed space, it is an explosion-proof device. Even if the electrical contacts of the reed switch generate electric sparks, they will not be transmitted to the outside world. Therefore, it is an intrinsically safe explosion-proof device. Furthermore, the outer wall of the reed switch can be made of non-magnetic materials, such as aluminum tubes, which has a better explosion-proof effect.

[0006] Furthermore, the reed switch can be extended to a magnetically controlled switch, such as a solid-state switch using a Hall device, and further, specifically an explosion-proof magnetically controlled switch.

[0007] The technical solution of the present invention is:

[0008] An intrinsically safe and explosion-proof electrostatic grounding clamp comprises a clamp arm, a clamp body spring, and a jaw with a grounding tooth in the jaw. The clamp arm is characterized in that at least one clamp arm is provided with a normally closed tactile switch, which is connected between the grounding tooth and the grounding wire. When the clamp arm of the electrostatic grounding clamp is grasped, the normally closed tactile switch responds and opens. The clamp arm is continued to be grasped until the jaw is opened, whereupon the grounding tooth engages the conductor. During the engagement process, the normally closed tactile switch remains in an open state. After engagement is completed, the grounding tooth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed tactile switch closes and conducts, completing the grounding operation.

[0009] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that a normally closed hand-touch switch is connected in parallel with a resistor R1 to pre-discharge the conductor when the electrostatic grounding clamp is engaged with the conductor.

[0010] Furthermore, the range of the resistor R1 is 1 megohm to 1000 megohm.

[0011] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the normally closed hand-touch switch is a normally closed push switch, which is connected between the grounding teeth and the grounding wire. When the clamp arm of the electrostatic grounding clamp is grasped, the normally closed push switch is actuated to open the circuit. The clamp arm of the electrostatic grounding clamp is further grasped until the jaws open, whereupon the grounding teeth engage the conductor. During the engagement process, the normally closed push switch remains in the open circuit state. After engagement is completed, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed push switch closes and conducts, completing the grounding operation.

[0012] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the normally closed push switch is an explosion-proof push switch.

[0013] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the normally closed push switch is sealed and wrapped in the elastic cavity 1 to achieve isolation and explosion protection.

[0014] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: the normally closed push switch is composed of a fixed electrode and a moving electrode, and the fixed electrode and the moving electrode are maintained in a normally closed state under the elastic force of the moving electrode. The fixed electrode and the moving electrode are connected across the grounding teeth and the grounding wire. When the clamp arm of the electrostatic grounding clamp is gripped by the hand, the moving electrode is separated from the fixed electrode under the grip of the hand and the circuit is opened. The clamp arm of the electrostatic grounding clamp is continued to be gripped until the jaws are opened, and then the grounding teeth engage the conductor. During the engagement process, the fixed electrode and the moving electrode are always in a separated state. After the engagement is completed, the grounding teeth and the conductor are in stable contact. After the clamp arm of the electrostatic grounding clamp is released by the hand, the fixed electrode and the moving electrode are closed and connected under the elastic force of the moving electrode to complete the grounding operation.

[0015] The intrinsically safe and explosion-proof electrostatic grounding clamp is characterized in that the normally closed push-button switch is composed of a permanent magnet and a magnetically controlled switch, and the magnetically controlled switch is connected between the grounding teeth and the grounding wire. When the electrostatic grounding clamp is grasped, the normally closed push-button switch is activated and opens the circuit. The clamp arm of the electrostatic grounding clamp is further grasped until the jaws open, whereupon the grounding teeth engage the conductor. During the engagement process, the normally closed push-button switch remains in the open circuit state. After engagement is completed, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed push-button switch closes and conducts, completing the grounding operation.

[0016] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the normally closed push switch is composed of a permanent magnet and a normally closed magnetic switch, the normally closed magnetic switch being connected between the grounding teeth and the grounding wire. The permanent magnet and the normally closed magnetic switch are kept separated and closed by a spring force. When the electrostatic grounding clamp is grasped, the permanent magnet and the normally closed magnetic switch approach each other, opening the circuit. The clamp arm of the electrostatic grounding clamp is further grasped until the jaws open, whereupon the grounding teeth engage the conductor. During the engagement process, the normally closed magnetic switch remains in an open state. After engagement is completed, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed magnetic switch loses the magnetic field of the permanent magnet and closes, completing the grounding operation.

[0017] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: the normally closed push switch is composed of a permanent magnet and a normally open magnetic control switch, the normally open magnetic control switch being connected between the grounding teeth and the grounding wire. The permanent magnet and the normally open magnetic control switch are kept in close proximity and closed by a spring force. When the electrostatic grounding clamp is grasped, the permanent magnet and the normally open magnetic control switch move away from each other, opening the circuit. The clamp arm of the electrostatic grounding clamp is further grasped until the jaws open, whereupon the grounding teeth engage the conductor. During the engagement process, the normally open magnetic control switch remains in an open circuit state. After the engagement is completed, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally open magnetic control switch regains the magnetic field of the permanent magnet and closes and conducts, completing the grounding operation.

[0018] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the clamp arm of the electrostatic grounding clamp is wrapped by an elastic cavity 2, and the normally closed push switch is located in the elastic cavity 2.

[0019] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: the clamp arm of the electrostatic grounding clamp is wrapped by a sealed elastic cavity 2, and the normally closed push switch is located in the sealed elastic cavity 2.

[0020] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: the clamp arm of the electrostatic grounding clamp is provided with a movable arm, the movable arm is connected to the clamp arm through an elastic member, and when the clamp arm is held by hand, the normally closed push switch is actuated by the movable arm.

[0021] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: the clamp arm is further provided with a hand-touch electrode and a normally open push switch, and the normally open push switch is connected between the hand-touch electrode and the grounding wire. When the clamp arm of the electrostatic grounding clamp is grasped by hand, the normally open push switch is actuated and closed, thereby grounding the hand-touch electrode and releasing static electricity from the human body.

[0022] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the normally open push switch is an explosion-proof push switch.

[0023] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the normally open push switch is sealed and wrapped in the elastic cavity 3 to achieve isolation and explosion protection.

[0024] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: a hand-touch electrode and a normally open push switch are further provided on the clamp arm; the normally open push switch is composed of a hand-touch electrode and a ground electrode; the hand-touch electrode and the ground electrode are kept separated by elastic force; when the clamp arm of the electrostatic grounding clamp is grasped by hand, the hand-touch electrode and the ground electrode are brought into contact and electrically conductive, thereby grounding the hand-touch electrode and releasing static electricity from the human body.

[0025] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: the clamp arm is further provided with a hand-touch electrode and a normally open push switch, the normally open push switch is composed of a permanent magnet and a normally open magnetic control switch, the hand-touch electrode and the permanent magnet are installed together and can move with each other, the permanent magnet and the normally open magnetic control switch are kept apart and open by elastic force, and when the clamp arm of the electrostatic grounding clamp is grasped by hand, the permanent magnet and the normally open magnetic control switch are brought into proximity, closing and conducting the switch, thereby grounding the hand-touch electrode and releasing static electricity from the human body.

[0026] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that: the clamp arm is further provided with a hand-touch electrode and a normally open push switch, the normally open push switch is composed of a permanent magnet and a normally closed magnetic control switch, the hand-touch electrode and the permanent magnet are installed together and can move with each other, the permanent magnet and the normally closed magnetic control switch are kept close to each other by elastic force and open, and when the clamp arm of the electrostatic grounding clamp is grasped by hand, the permanent magnet and the normally closed magnetic control switch move away from each other, closing and conducting, thereby achieving grounding of the hand-touch electrode and releasing static electricity from the human body.

[0027] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the installation positions of the magnetic control switch and the permanent magnet are interchangeable.

[0028] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the magnetic control switch is an explosion-proof magnetic control switch.

[0029] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the magnetic control switch is a reed switch.

[0030] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that an elastic cavity 2 is wrapped around the clamp arm, and the elastic force is provided by the elastic cavity 2.

[0031] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the elastic cavity 2 is made of a sub-conductor material and has a resistance value R.

[0032] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the elastic cavity 2 is made of conductive rubber and has a resistance value R.

[0033] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the hand-touch electrode is installed on the movable arm, and the elastic force is provided by an elastic member.

[0034] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that a resistor R is arranged across the hand-touch electrode and the ground wire. When the hand touches the clamp arm of the electrostatic grounding clamp and presses the clamp arm, the human body's static electricity is pre-discharged through the resistor R, and the resistance value is R.

[0035] The intrinsically safe explosion-proof electrostatic grounding clamp is characterized in that the resistance value R is 10 megohms to 1000 megohms.

[0036] The beneficial effects of the present invention are: no static electric sparks are generated when the electrostatic grounding clamp is used, static electricity in the human body is further safely released, and no electric shock is generated to the person during the process of releasing static electricity in the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention adopts a normally closed pressure switch implementation scheme.

[0038] Figure 2This is an embodiment of the present invention using an electrode contact switch.

[0039] Figure 3 The present invention adopts the implementation scheme of normally closed reed switch.

[0040] Figure 4 The present invention adopts the implementation scheme of normally open reed switch.

[0041] Figure 5 Implementation plan for adding a pressure switch to the clamp arm to safely release static electricity from the human body.

[0042] Figure 6 An implementation plan for adding electrode contacts to the clamp arm to safely release static electricity from the human body.

[0043] Figure 7 An implementation plan for adding a normally open reed switch to the clamp arm to safely release static electricity from the human body.

[0044] Figure 8 Implementation plan for adding a normally closed reed switch to the clamp arm to safely release static electricity from the human body.

[0045] Figure 9 The present invention is an embodiment of a pressure switch using normally open and normally closed double-electrode contacts.

[0046] Figure 10 The present invention adopts an implementation scheme of a normally open and normally closed double-electrode reed switch.

[0047] Figure 11 This is a schematic diagram of the concept switch used in the present invention.

[0048] Figure 12 This is an implementation scheme of the present invention using a movable arm + elastic member.

[0049] Figure 13 This is an implementation scheme of the present invention using a hand-touch electrode + elastic member.

[0050] Figure 14 This is an implementation scheme of the present invention using a normally closed touch switch. DETAILED DESCRIPTION

[0051] The present invention will be further described below with reference to the accompanying drawings and examples.

[0052] Figure 1The present invention adopts a normally closed pressure switch implementation scheme. The electrostatic grounding clamp includes a clamp arm 101, a clamp arm 105, a jaw lip 103, a jaw lip 104, a clamp body spring 102, and a grounding tooth 201 is set in the jaw lip. An elastic cavity 1051 is set or wrapped on at least one clamp arm of the electrostatic grounding clamp. A normally closed pressure switch K is set in the elastic cavity 1051. The normally closed pressure switch (a type of push switch) is opened and disconnected by the pressure applied to the pressure handle. Assume that the triggering pressure is f1. The normally closed pressure switch K is connected between the grounding tooth 201 and the ground wire. The pressure of the normally closed pressure switch K is The force handle and elastic cavity 1051 remain separated or in zero-pressure contact. Assuming the elastic force of elastic cavity 1051 is f, the combined force of the elastic force f + the trigger pressure f1 is less than the elastic force F of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is gripped until the jaws open, the pressure of the hand must have overcome the combined force of the elastic force f + the trigger pressure f1, causing the normally closed pressure switch K to open. At this point, the jaws engage the conductor. During the engagement process, the normally closed pressure switch K remains in an open state. After engagement is complete, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed pressure switch closes and conducts, completing the grounding operation. Furthermore, the normally closed pressure switch K is enclosed by a sealed elastic cavity 2000, thus forming a flameproof pressure switch. Of course, the normally closed pressure switch K itself can be an explosion-proof switch. Here, the clamp arm 101 is encased in an insulating material to prevent direct grounding by the human body, and the elastic cavity 1051 is made of an insulating elastic material.

[0053] Figure 1 In the embodiment, the elastic cavity 1051 can seal and wrap the clamp arm and the normally closed pressure switch, so that even if a non-explosion-proof switch is used, the elastic cavity 1051 can provide explosion-proof isolation.

[0054] Figure 1 In the embodiment, a normally closed pressure switch is used. Considering that the trigger pressure must be less than the elastic force of the caliper spring, it can actually be assumed that the trigger pressure of the normally closed pressure switch can be zero, such as a touch switch. In this way, the concept of the normally closed pressure switch can be extended to a normally closed press switch, and further extended to a normally closed hand-touch switch, that is, a switch that responds when touched by hand.

[0055] Alternatively, as an implementation, the pressure switch's triggering pressure f1 can be directly utilized for reset. Specifically, a pressing surface is provided directly attached to the pressure handle of the pressure switch, and in this case, the elastic cavity 1051 can be removed. The invention is characterized in that at least one clamp arm is provided with a normally closed pressure switch, which is connected between the grounding tooth and the ground wire. A pressing surface is attached to the pressure handle of the normally closed pressure switch. The triggering pressure of the normally closed pressure switch is less than the elastic force of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is gripped, the gripping force overcomes the triggering pressure, causing the normally closed pressure switch to open. When the clamp jaws engage a conductor, the normally closed pressure switch remains open. When the clamp arm is released, allowing the grounding tooth to contact the conductor, the pressure handle of the normally closed pressure switch loses grip and closes, achieving safe grounding of the conductor.

[0056] Figure 2 This is an embodiment of the present invention using an electrode contact switch. The electrostatic grounding clamp includes a clamp arm 101, a clamp arm 105, a jaw lip 103, a jaw lip 104, a clamp body spring 102, and a grounding tooth 201 is provided in the jaw lip. An elastic cavity 1051 is provided or wrapped on at least one clamp arm of the electrostatic grounding clamp. Within the elastic cavity 1051, a normally closed push switch is formed by a fixed electrode 501, a movable electrode 502, and a pressure rod 503. The fixed electrode 501 and the movable electrode 502 maintain a normally closed state under the elastic force f2 of the movable electrode 502. The fixed electrode 501 and the movable electrode 502 are connected between the grounding tooth 201 and the ground wire (the connection does not distinguish between the connection endpoints, and the movable electrode can also be connected to the ground tooth and the fixed electrode to the ground wire). The pressure rod 503 is connected to the ground wire. 03 and the elastic cavity 1051 remain separated or in zero-pressure contact. Assuming the elastic force of the elastic cavity 1051 is f, and the combined force of the elastic force f + the elastic force f2 is less than the elastic force F of the clamp body spring, when the clamp arm of the dynamic electrostatic grounding clamp is gripped until the jaws open, the pressure applied by the hand must have overcome the combined force of the elastic force f2 + the elastic force f1, causing the movable electrode 502 and the fixed electrode 501 to separate and open the circuit. At this time, the jaws engage the conductor. During the engagement process, the movable electrode 502 and the fixed electrode 501 remain separated. After engagement is completed, the grounding teeth 201 and the conductor maintain stable contact. After the clamp arm of the electrostatic grounding clamp is released, the fixed electrode 501 and the movable electrode 502 return to their normally closed state under the elastic force f2 of the movable electrode 502, and the grounding operation is completed. Because the elastic cavity 1051 has a sealing effect, even if the movable electrode 502 and the fixed electrode 501 collide and generate sparks, they are sealed within the elastic cavity 1051, thus achieving explosion-proof properties. Here, the clamp arm 101 is wrapped in insulating material to prevent direct grounding of the human body, and the elastic cavity 1051 is made of insulating elastic material. One advantage of using an electrode contact switch is that a larger contact distance can be designed to increase the switch's withstand voltage. Since the breakdown voltage of air is approximately 3kV / mm, a contact gap of 3mm is sufficient in most situations.

[0057] Figure 3 The present invention adopts an implementation scheme of a normally closed reed switch. The electrostatic grounding clamp includes a clamp arm 101, a clamp arm 105, a jaw lip 103, a jaw lip 104, a clamp body spring 102, and a grounding tooth 201 is set in the jaw lip. An elastic cavity 1051 is set or wrapped on at least one clamp arm of the electrostatic grounding clamp. A permanent magnet 602 and a normally closed reed switch 601 are set in the elastic cavity 1051. The normally closed reed switch is connected between the grounding tooth 201 and the grounding wire. The permanent magnet 602 and the normally closed reed switch are kept separated and closed by the elastic force of the elastic cavity 1051. The elastic force of the elastic cavity 1051 is f, which is less than the elastic force F of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is gripped until the jaws open, the pressure of the hand inevitably overcomes the elastic force, causing the permanent magnet 602 to approach the normally closed reed switch, opening the circuit. The jaws then engage the conductor, and during the engagement process, the normally closed reed switch remains in an open-circuit state. After engagement is complete, the grounding teeth 201 and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the elastic force of the elastic cavity 1051 separates the permanent magnet 602 from the normally closed reed switch 601, closing the circuit and completing the grounding operation. Here, the clamp arm 101 is wrapped in an insulating material to prevent direct grounding of the human body, and the elastic cavity 1051 is made of an insulating elastic material. Given that the permanent magnet 602 and normally closed reed switch 601 form a proximity-activated switch, their mounting positions can be interchanged.

[0058] Figure 4The present invention adopts an implementation scheme of a normally open reed switch. The electrostatic grounding clamp includes a clamp arm 101, a clamp arm 105, a jaw lip 103, a jaw lip 104, a clamp body spring 102, and a grounding tooth 201 is set in the jaw lip. An elastic cavity 1051 is set or wrapped on at least one clamp arm of the electrostatic grounding clamp. A permanent magnet 602 and a normally open reed switch 6011 are set in the elastic cavity 1051. The permanent magnet 602 is installed and connected together through a connecting portion 6012 so that it can move with the connection. The normally open reed switch 6011 is connected between the grounding tooth 201 and the grounding wire. The permanent magnet 602 and the normally open reed switch are connected by the elasticity of the elastic cavity 1051. The force is maintained through the connection portion 6012, closing the conductor. Assuming the elastic force of the elastic cavity 1051 is f, which is less than the elastic force F of the clamp body spring, when the clamp arm of the electrostatic grounding clamp is gripped until the jaws open, the gripping force must have overcome the elastic force, causing the permanent magnet 602 to move away from the normally open reed switch, thereby opening the circuit. At this point, the jaws engage the conductor, and during the engagement process, the normally open reed switch remains in an open state. After engagement is complete, the grounding teeth 201 and the conductor maintain stable contact. After the clamp arm of the electrostatic grounding clamp is released, the permanent magnet 602, under the elastic force of the elastic cavity 1051, approaches the normally open reed switch 6011, closing and conducting the circuit, completing the grounding operation. Here, the clamp arm 101 is wrapped with an insulating material to prevent direct grounding of the human body, and the elastic cavity 1051 is made of an insulating elastic material. Considering that the permanent magnet 602 and the normally closed reed switch 6011 form a remote action switch, the installation positions of the permanent magnet 602 and the normally open reed switch 6011 can be interchanged.

[0059] Figure 5The implementation plan of adding a pressure switch to the clamp arm to safely release the static electricity of the human body takes into account that the human body itself carries static electricity. Even if the grounding clamp is intrinsically safe, sparks will still be generated when people operate it in an explosion-proof environment, creating safety hazards. An elastic cavity 1051 is provided or enclosed on at least one arm of the electrostatic grounding clamp. A hand-touch electrode 301 is provided on elastic cavity 1051. A pressure switch K1 is located within elastic cavity 1051. The pressure switch is activated by pressure applied to the pressure handle, with the trigger pressure being f1. Pressure switch K1 is connected 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 apart or in contact with zero pressure by the elastic force f of elastic cavity 1051. The combined force of the elastic force f + the trigger pressure 2f1 (taking into account the f1 of K) is less than the spring force F of the clamp body. When the clamp arm of the electrostatic grounding clamp is gripped until the jaws open, the gripping force overcomes the combined force of the elastic force f + the trigger pressure 2f1, closing the pressure switch and causing it to conduct, grounding the hand-touch electrode 301 and dissipating static electricity from the human body. Furthermore, pressure switch K1 is enclosed by a sealed elastic cavity 3000, thus forming a flameproof pressure switch. Considering the concept of electrostatic grounding, materials with leakage resistance between 10 megohms and 1000 megohms are considered anti-static materials. In fact, a resistance of several megohms is equivalent to direct grounding (zero resistance grounding is prone to generate electrostatic sparks). A resistor R can be set across the hand touch electrode 301 and the ground wire, and its resistance value is: 10 megohms to 1000 megohms. When the hand grasps the arm of the electrostatic grounding clamp, static electricity is pre-discharged through the hand-touch electrode 301 and the resistor R. According to the RC discharge curve, 70% of the human body voltage can be pre-discharged in about 3 seconds. The human body capacitance is generally 200pF, the human body resistance is 10 kiloohms, and the resistance of the resistor R is 330 megohms. According to the RC curve, static electricity pre-discharge is essentially completed after 3 seconds, and no electric shock is caused to the human body. The residual voltage is less than 100 volts. When the hand grasps the arm of the electrostatic grounding clamp until the jaws open, the pressure switch must have closed and turned on, directly grounding the human body and releasing the residual voltage. The residual voltage is very low and does not cause an electric shock to the human body. At the same time, the low residual voltage discharge is intrinsically safe (energy is less than 0.28mJ). In other words, even if the elastic cavity 1051 is not sealed and the sealing elastic cavity 3000 is not provided, it is intrinsically safe.

[0060] Figure 5 The technical features of the safe release of human static electricity are: a hand-touch electrode and a pressure switch are provided on at least one clamp arm, the pressure switch is connected across the hand-touch electrode and the ground wire, the hand-touch electrode and the pressure handle of the pressure switch are kept separated or in zero-pressure contact by elastic force, the resultant force of the elastic force and the triggering pressure of the pressure switch is less than the elastic force of the clamp body spring, and when the clamp arm of the electrostatic grounding clamp is gripped by the hand until the jaws open, the gripping force of the hand must have overcome the resultant force to close and conduct the pressure switch, thereby achieving grounding of the hand-touch electrode and releasing human static electricity.

[0061] Alternatively, as an implementation, the trigger pressure f1 of the pressure switch can be directly utilized for reset. Specifically, the hand-touch electrode 301 is directly attached to the pressure handle of the pressure switch, and the elastic cavity 1051 can be removed. This embodiment is characterized in that at least one clamp arm is provided with a hand-touch electrode and a pressure switch, the pressure switch being connected between the hand-touch electrode and a ground line. The hand-touch electrode is attached to the pressure handle of the pressure switch, and the trigger pressure of the pressure switch is less than the elastic force of the clamp body spring. When the clamp arm of the static grounding clamp is gripped until the jaws open, the gripping force overcomes the trigger pressure, causing the pressure switch to close and conduct, thereby grounding the hand-touch electrode and discharging static electricity from the human body.

[0062] In addition, as an implementation scheme, the elastic cavity 1051 is made of sub-conductive material, such as conductive rubber or plastic, and its grounding resistance is 10 megohms to 1000 megohms. The sub-conductive elastic cavity can replace the resistor R, and of course the resistor R can still be set.

[0063] Figure 6The embodiment of adding electrode contacts to the clamp arms to safely discharge static electricity from the human body takes into account that the human body itself carries static electricity. Even if the grounding clamp is intrinsically safe, sparks can still be generated when operated in an explosion-proof environment, creating a safety hazard. An elastic cavity 1051 is provided or enclosed on at least one clamp arm of the electrostatic grounding clamp. A hand-touch electrode 301 is provided on the elastic cavity 1051, and a grounding electrode 302 is provided within the elastic cavity 1051. The hand-touch electrode 301 and the grounding electrode 302 are kept separate by the elastic force f of the elastic cavity 1051. The elastic force f+f2 is less than the elastic force F of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is grasped and the jaws are opened, the hand-touch electrode 301 will inevitably overcome the elastic force f+f2 and make contact with the grounding electrode 302, thus achieving grounding of the hand-touch electrode 301 and discharging static electricity from the human body. Because the elastic cavity 1051 has a sealing effect, even if sparks are generated when the hand-touch electrode 301 and the grounding electrode 302 collide, they are sealed within the elastic cavity 1051, thus achieving explosion-proof. Considering the concept of electrostatic grounding, materials with leakage resistance between 10 megohms and 1000 megohms are considered anti-static materials. In fact, a resistance of several megohms is equivalent to direct grounding (zero resistance grounding is prone to generate electrostatic sparks). A resistor R can be set across the hand touch electrode 301 and the ground wire, and its resistance value is: 10 megohms to 1000 megohms. When the hand grasps the arm of the static grounding clamp, static electricity is pre-discharged through the hand-touch electrode 301 and the resistor R. According to the RC discharge curve, 70% of the human body voltage can be pre-discharged in about 3 seconds. The human body capacitance is generally 200pF, the human body resistance is 10 kiloohms, and the resistor R is 330 megohms. According to the RC curve, static electricity pre-discharge is essentially complete after 3 seconds, and no electric shock is caused to the human body. The residual voltage is less than 100 volts. When the hand grasps the arm of the static grounding clamp until the jaws open, the hand-touch electrode 301 must have overcome the elastic force f and come into contact with the grounding electrode 302 for electrical conduction, directly grounding the human body and releasing the residual voltage. The residual voltage is very low and does not cause an electric shock to the human body. At the same time, the low residual voltage discharge is intrinsically safe (energy is less than 0.28mJ), which means that it is intrinsically safe even if the elastic cavity 1051 is not sealed. The feature of this embodiment is that: a hand-touch electrode and a grounding electrode are provided on at least one clamp arm, and the hand-touch electrode and the grounding electrode are kept separated by an elastic force, and the elastic force is smaller than the elastic force of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is grasped by hand until the jaws are opened, the hand-touch electrode must have overcome the elastic force and the hand-touch electrode and the grounding electrode are in contact and conductive, thereby achieving grounding of the hand-touch electrode and releasing static electricity from the human body.

[0064] In addition, as an implementation scheme, the elastic cavity 1051 is made of sub-conductive material, such as conductive rubber or plastic, and its grounding resistance is 10 megohms to 1000 megohms. The sub-conductive elastic cavity can replace the resistor R, and of course the resistor R can still be set.

[0065] Figure 7 An implementation scheme for safely discharging static electricity from the human body by adding a normally open reed switch to the clamp arm includes: an elastic cavity 1051 provided on or wrapped around at least one clamp arm of the electrostatic grounding clamp; a hand touch electrode 301 is provided on the elastic cavity 1051; a permanent magnet 401 is provided on the elastic cavity 1051; and a normally open reed switch 402 is provided within the elastic cavity 1051. The hand touch electrode 301 and the permanent magnet 401 are installed together and can move with each other. The permanent magnet 401 and the normally open reed switch 402 are kept separated and open by the elastic force f of the elastic cavity 1051. The elastic force f is less than the elastic force F of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is grasped by hand until the jaws open, the permanent magnet 401 must be close to the normally open reed switch 402, causing it to conduct, thereby grounding the hand touch electrode 301 and discharging static electricity from the human body. Considering the concept of electrostatic grounding, materials with leakage resistance between 10 megohms and 1000 megohms are considered anti-static materials. In fact, a resistance of several megohms is equivalent to direct grounding (zero resistance grounding is prone to generate electrostatic sparks). A resistor R can be set across the hand touch electrode 301 and the ground wire, and its resistance value is: 10 megohms to 1000 megohms. When the hand grasps the arm of the electrostatic grounding clamp, static electricity is pre-discharged through the hand-touch electrode 301 and the resistor R. According to the RC discharge curve, 70% of the human body voltage can be pre-discharged in about 3 seconds. The human body capacitance is generally 200pF, the human body resistance is 10 kiloohms, and the resistance of the resistor R is 330 megohms. According to the RC curve, static electricity pre-discharge is essentially completed after 3 seconds, and no electric shock is caused to the human body. The residual voltage is less than 100 volts. When the hand grasps the arm of the electrostatic grounding clamp until the jaws open, the permanent magnet 401 must be close to the normally open reed switch 402, causing the normally open reed switch 402 to close and conduct, directly grounding the human body and releasing the residual voltage. The residual voltage is very low and does not cause an electric shock to the human body. The technical features of this implementation scheme are: a hand-touch electrode, a permanent magnet, and a normally-open magnetic control switch are provided on at least one clamp arm; the hand-touch electrode and the permanent magnet are installed together and can move with each other; the permanent magnet and the normally-open magnetic control switch are kept separated and open by an elastic force; the elastic force is less than the elastic force of the clamp body spring; when the clamp arm of the electrostatic grounding clamp is grasped by hand until the jaws are opened, the permanent magnet must have overcome the elastic force and approached the normally-open magnetic control switch to make it conductive, thereby achieving grounding of the hand-touch electrode and releasing static electricity from the human body.

[0066] Considering that the permanent magnet 401 and the normally open reed switch 402 form a proximity switch, the installation positions of the permanent magnet 401 and the normally open reed switch 402 can be interchanged.

[0067] In addition, as an implementation scheme, the elastic cavity 1051 is made of sub-conductive material, such as conductive rubber or plastic, and its grounding resistance is 10 megohms to 1000 megohms. The sub-conductive elastic cavity can replace the resistor R, and of course the resistor R can still be set.

[0068] Figure 8 In an implementation scheme for safely discharging static electricity from the human body by adding a normally closed reed switch to the clamp arm, considering that a proximity switch can also be implemented by a normally closed reed switch, an elastic cavity 1051 is provided on or wrapped around at least one clamp arm of the electrostatic grounding clamp, a hand touch electrode 301 is provided on the elastic cavity 1051, a permanent magnet 401 is fixedly provided in the elastic cavity 1051 via a connecting portion 4022, and a normally closed reed switch 4021 is also provided in the elastic cavity 1051. The hand touch electrode 301 and the permanent magnet 401 are mounted and connected together via the connecting portion 4022 so as to be movable. The permanent magnet 401 and the normally closed reed switch 4021 are kept in proximity and open circuit by the elastic force f of 1051. The elastic force f is less than the elastic force F of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is grasped by the hand until the jaws are opened, the permanent magnet 401 must have moved away from the normally closed reed switch, causing it to be conductive, thereby grounding the hand touch electrode 301 and discharging static electricity from the human body. Considering the concept of electrostatic grounding, materials with leakage resistance between 10 megohms and 1000 megohms are considered anti-static materials. In fact, a resistance of several megohms is equivalent to direct grounding (zero resistance grounding is prone to generate electrostatic sparks). A resistor R can be set across the hand touch electrode 301 and the ground wire, and its resistance value is: 10 megohms to 1000 megohms. When the hand grasps the arm of the electrostatic grounding clamp, static electricity is pre-discharged through the hand-touch electrode 301 and the resistor R. According to the RC discharge curve, 70% of the human body voltage can be pre-discharged in about 3 seconds. The human body capacitance is generally 200pF, the human body resistance is 10 kiloohms, and the resistance of the resistor R is 330 megohms. According to the RC curve, static electricity pre-discharge is essentially completed after 3 seconds, and the human body does not feel an electric shock. The residual voltage is less than 100 volts. When the hand grasps the arm of the electrostatic grounding clamp until the jaws open, the permanent magnet 401 must have moved away from the normally closed reed switch 4021, causing the normally closed reed switch 4021 to close and conduct, directly grounding the human body and releasing the residual voltage. The residual voltage is very low and does not cause an electric shock. The technical features of this implementation scheme are: a hand-touch electrode, a permanent magnet, and a normally closed magnetic control switch are provided on at least one clamp arm; the hand-touch electrode and the permanent magnet are installed together and can move with each other; the permanent magnet and the normally closed magnetic control switch are kept close to each other and open by elastic force; the elastic force is less than the elastic force of the clamp body spring; when the clamp arm of the electrostatic grounding clamp is grasped by hand until the jaws are opened, the permanent magnet must have overcome the elastic force and moved away from the normally closed magnetic control switch, making it conductive, thereby achieving grounding of the hand-touch electrode and releasing static electricity from the human body.

[0069] Considering that the permanent magnet 401 and the normally open reed switch 4021 form an off switch, the installation positions of the permanent magnet 401 and the normally closed reed switch 4021 can be interchanged.

[0070] In addition, as an implementation scheme, the elastic cavity 1051 is made of sub-conductive material, such as conductive rubber or plastic, and its grounding resistance is 10 megohms to 1000 megohms. The sub-conductive elastic cavity can replace the resistor R, and of course the resistor R can still be set.

[0071] Figure 9 The embodiment of the pressure switch of the present invention adopts normally open normally closed double electrode contacts. Figure 5 A variation of the illustrated embodiment replaces K and K1 with a normally open, normally closed, dual-pole pressure switch K2. K2 is a single-pole, double-throw (SPDT) switch. As an implementation, this eliminates the human body's static pre-discharge resistor R. When the clamp arm is held until the jaws open, the body's static electricity is discharged through the normally open contact of the pressure switch, which connects to the ground. At this point, the body is separated from the conductor to be engaged by the clamp. After the clamp is released, the normally open contact of the pressure switch opens, and only then does the normally closed contact of the pressure switch close. Therefore, the body remains separated from the engaged conductor during operation. Furthermore, K2 can be enclosed in a sealed elastic cavity 2000 or 3000, similar to K or K1, to achieve isolation and explosion protection.

[0072] Figure 10 The present invention adopts the embodiment of the normally open normally closed double electrode reed switch, which is Figure 7 A variation of the illustrated embodiment uses a two-electrode reed switch device in place of 402 and 601. 701 is a two-electrode reed switch, i.e., a single-pole, double-throw (SPDT) reed switch, and 702 is a permanent magnet. As one implementation, this eliminates the human body's static pre-discharge resistor, R. When the clamp arm is gripped until the jaws open, the human body's static electricity is discharged through the normally open contacts of the two-electrode reed switch. At this point, the human body is separated from the conductor to be engaged by the clamp. After the grip is released, the normally open contacts of the two-electrode reed switch open, and only then do the normally closed contacts of the two-electrode reed switch close, conducting. Therefore, the human body remains separated from the engaged conductor during operation.

[0073] Figure 11This is a schematic diagram of the conceptual switch used in the present invention. Considering the normally closed pressure switch K, the normally closed switch composed of the fixed electrode 501 and the movable electrode 502, the switch composed of the permanent magnet 602 and the normally closed reed switch 601, and the switch composed of the permanent magnet 602 and the normally open reed switch 6011 in this case, the purpose of these switches is to connect the grounding tooth and the ground wire after the grounding clamp stably bites the conductor. Therefore, 901 is defined as a normally closed hand-touch switch, that is, it opens when the hand touches it and closes when the hand leaves it. The contact pressure can be zero, including a touch switch. Considering the pressure switch K1 in this case, the switch composed of the hand touch electrode 301 and the ground electrode 302, the switch composed of the permanent magnet 401 and the normally open reed switch 402, and the switch composed of the permanent magnet 401 and the normally closed reed switch 4021, the purpose of these switches is to close and connect before the jaws open when the grounding clamp is held by hand (the hand and the hand touch electrode are in stable contact) to achieve human body grounding and release of static electricity. Therefore, 902 is defined as a normally open press switch. Combined with the human body static pre-release resistor R, the pressing action process includes a certain amount of time to achieve static pre-release.

[0074] Figure 12 The present invention adopts an implementation scheme of a movable arm + elastic member. In this case, the implementation scheme of setting or wrapping the elastic cavity 1051 on the clamp arm can be replaced by a movable arm 3012 + elastic member 3011. The clamp arm 105 of the electrostatic grounding clamp is provided with a movable arm 3012, and the movable arm 3012 is connected to the clamp arm 105 through the elastic member 3011. The elastic force f is provided by the elastic member 3011. The elastic member 3011 can be a spring. When the clamp arm is held by hand, the normally closed hand touch switch 901 is actuated through the movable arm 3012.

[0075] Figure 13 This is an implementation scheme of the present invention using a hand-touch electrode + elastic member. The hand-touch electrode is installed on the movable arm, and the elastic member 3011 provides elastic force f.

[0076] Figure 14 The present invention adopts an implementation scheme of a normally closed touch switch. Considering that the purpose of switch 1401 is to connect the grounding teeth and the ground wire after the grounding clamp stably bites the conductor, it can also be understood that the circuit is opened when the hand touches the grounding clamp switch 1401. When the hand leaves the grounding clamp, the grounding teeth of the grounding clamp must have been in stable contact with the conductor. Therefore, 1401 is a normally closed touch switch and 1402 is a touch electrode.

[0077] In this case Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 12 、 Figure 14The solution shown does not have the function of discharging static electricity from the human body. It is suitable for use scenarios where the grounding wire is connected to the oil truck and the grounding clamp is engaged with the grounding conductor before unloading the oil. In these application scenarios, the grounding clamp arm should be an insulator. Therefore, the clamp arm 101 is wrapped with insulating material to prevent the human body from being directly grounded. At the same time, the elastic cavity 1051 is made of insulating elastic material. Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 13 The scheme shown adds a human body static electricity release function, which is suitable for use scenarios where the grounding terminal is connected, such as when the grounding clamp is connected to the grounding pile of the oil depot, and the oil tanker is engaged with the grounding conductor of the oil tanker before unloading the oil. In these application scenarios, the grounding clamp arm can be a sub-conductor to pre-release the static electricity of the human body. Therefore, the clamp arm 101 can be wrapped with a sub-conductor material to pre-release the static electricity of the human body. At the same time, the elastic cavity 1051 can be made of a sub-conductor elastic material. Of course, the technical solution of insulating material + resistor R can be adopted, and of course, insulating material can still be used.

[0078] In this case, a resistor R1 can be connected in parallel with the normally closed manual switch to pre-discharge the conductor while the electrostatic grounding clamp is engaged with the conductor. Furthermore, the value of resistor R1 is 1 megohm to 1000 megohm.

[0079] In addition, a glow discharge tube can be set in the electrostatic discharge circuit to display the static discharge process (if the explosion-proof requirements are met, such as using explosion-proof neon bubbles).

[0080] Furthermore, considering the reed switch's withstand voltage, a vacuum reed switch can be used with a larger gap between the electrodes. Alternatively, the reed switch can be filled with insulating, pressure-resistant oil, creating an oil-immersed reed switch. For example, transformer oil, with a dielectric strength exceeding 4000 kV / cm, is used. Transformer oil is primarily composed of cycloalkanes, alkanes, and aromatic hydrocarbons, with a relative dielectric constant ε between 2.2 and 2.4. A characteristic of oil-immersed reed switches is delayed opening or closing. In this case, the delayed closing of the normally open reed switch helps extend the pre-discharge period for static electricity from the human body, while the delayed closing of the normally closed reed switch helps maintain the stable engagement of the electrostatic grounding clamp (i.e., the normally closed reed switch closes only after the grounding teeth and conductor are firmly connected).

[0081] The resistance values ​​of the resistors given in the present invention can be understood as recommended values ​​and do not necessarily limit the scope of protection of this case. They are specifically implemented in accordance with the standards of relevant industries, such as GB4385-1995 (recommended resistance value range is 100kΩ ~ 1000MΩ), GB / T 11210-2014 (recommended resistance value not exceeding 300MΩ), GJB 2605-1996, GB 12014-1989, and industry standard SY / T7354-2017 (recommended resistance value is 10MΩ ~ 1000MΩ).

[0082] The above application modes and rules do not limit the basic characteristics of the methods and applications of the present invention, nor do they limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An intrinsically safe explosion-proof electrostatic grounding clamp, comprising a clamp arm, a clamp body spring, and a jaw with grounding teeth, characterized by: At least one clamp arm is provided with a normally closed hand-touch switch, which is a switch that responds when touched by hand. The normally closed hand-touch switch is connected across the grounding teeth and the grounding wire. When the clamp arm of the electrostatic grounding clamp is gripped and touched by hand, the normally closed hand-touch switch responds and opens. The clamp arm of the electrostatic grounding clamp is continued to be gripped until the jaws are opened and the grounding teeth engage the conductor. During the engagement process, the normally closed hand-touch switch is always in the open state. After the clamp arm of the electrostatic grounding clamp is released, the grounding teeth and the conductor come into contact. The normally closed hand-touch switch is closed and connected only after the hand leaves the clamp arm of the electrostatic grounding clamp, ensuring that the normally closed hand-touch switch is in the open state before the hand leaves the clamp arm of the electrostatic grounding clamp.

2. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 1 is characterized in that: The normally closed hand-touch switch is connected in parallel with the resistor R1 to pre-discharge the conductor when the electrostatic grounding clamp bites the conductor.

3. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 2, characterized in that: The value of resistor R1 is 1 megohm to 1000 megohm.

4. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 1, characterized in that: The normally closed hand-touch switch is a touch switch.

5. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 1 is characterized in that: The normally closed hand-touch switch is a normally closed push switch, which is connected between the grounding tooth and the grounding wire. The touch pressure f1 of the normally closed push switch is less than the elastic force F of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is held by the hand until the jaws are opened, the pressure of the hand must have overcome the touch pressure f1 and the normally closed push switch is opened, and the grounding tooth and the ground wire are disconnected. At this time, the grounding tooth in the jaws bites the conductor. During the biting process, the normally closed push switch is always in an open state. After the biting is completed, the grounding tooth and the conductor are in stable contact when the pressure of the hand is less than the elastic force F of the clamp body spring. After the clamp arm of the electrostatic grounding clamp is released, the pressure of the hand is less than the touch pressure f1 of the normally closed push switch, and the normally closed push switch will be closed and connected to complete the grounding operation.

6. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 5, characterized in that: The normally closed push switch is an explosion-proof push switch.

7. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 5, characterized in that: The normally closed push-button switch is sealed and wrapped in elastic cavity 1 to achieve isolation and explosion protection. Assuming the elastic force of elastic cavity 1 is f, the combined force of the elastic force f and the trigger pressure f1 is less than the elastic force F of the clamp body spring. When the clamp arm of the electrostatic grounding clamp is grasped until the jaws open, the pressure of the hand must have overcome the combined force of the elastic force f and the trigger pressure f1, causing the normally closed push-button switch to open. At this time, the jaws bite the conductor. During the biting process, the normally closed push-button switch is always in the open state. After the biting is completed, the grounding teeth and the conductor are in stable contact. Only after the clamp arm of the electrostatic grounding clamp is released does the normally closed push-button switch close and conduct to complete the grounding operation.

8. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 5, characterized in that: The normally closed push switch is composed of a fixed electrode and a moving electrode. The fixed electrode and the moving electrode are kept in a normally closed state under the elastic force of the moving electrode. The fixed electrode and the moving electrode are connected across the grounding teeth and the grounding wire. When the clamp arm of the static grounding clamp is gripped by the hand, the moving electrode is separated from the fixed electrode under the grip of the hand and the circuit is opened. The clamp arm of the static grounding clamp is continued to be gripped until the jaws are opened and the grounding teeth engage the conductor. During the engagement process, the fixed electrode and the moving electrode are always in a separated state. After the engagement is completed, the grounding teeth and the conductor are in stable contact. After the clamp arm of the static grounding clamp is released by the hand, the fixed electrode and the moving electrode are closed and connected under the elastic force of the moving electrode to complete the grounding operation.

9. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 5, characterized in that: The normally closed push-button switch is composed of a permanent magnet and a magnetically controlled switch. The magnetically controlled switch is connected between the grounding teeth and the grounding wire. When the electrostatic grounding clamp is gripped, the normally closed push-button switch is activated and opens the circuit. The clamp arm of the electrostatic grounding clamp is further gripped until the jaws open, whereupon the grounding teeth engage the conductor. During the engagement process, the normally closed push-button switch remains in the open circuit state. After the engagement is completed, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed push-button switch closes and conducts, completing the grounding operation.

10. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 5, characterized in that: The normally closed push switch is composed of a permanent magnet and a normally closed magnetic control switch. The normally closed magnetic control switch is connected between the grounding teeth and the grounding wire. The permanent magnet and the normally closed magnetic control switch are kept separated and closed by elastic force. When the electrostatic grounding clamp is grasped, the permanent magnet and the normally closed magnetic control switch approach each other and open the circuit. The clamp arm of the electrostatic grounding clamp is further grasped until the jaws open, and then the grounding teeth engage the conductor. During the engagement process, the normally closed magnetic control switch remains in the open circuit state. After the engagement is completed, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally closed magnetic control switch loses the magnetic field of the permanent magnet and closes and conducts, completing the grounding operation.

11. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 5, characterized in that: The normally closed push-button switch is composed of a permanent magnet and a normally open magnetic control switch. The normally open magnetic control switch is connected between the grounding teeth and the grounding wire. The permanent magnet and the normally open magnetic control switch are kept close to each other by elastic force and closed. When the electrostatic grounding clamp is grasped, the permanent magnet and the normally open magnetic control switch move away from each other and open the circuit. The clamp arm of the electrostatic grounding clamp is further grasped until the jaws open, and then the grounding teeth engage the conductor. During the engagement process, the normally open magnetic control switch remains in the open circuit state. After the engagement is completed, the grounding teeth and the conductor are in stable contact. When the clamp arm of the electrostatic grounding clamp is released, the normally open magnetic control switch regains the magnetic field of the permanent magnet and closes and conducts, completing the grounding operation.

12. The intrinsically safe explosion-proof electrostatic grounding clamp according to any one of claims 1 to 11, characterized in that: The clamp arm of the electrostatic grounding clamp is wrapped by the second elastic cavity, and the normally closed hand-touch switch is located in the second elastic cavity.

13. The intrinsically safe explosion-proof electrostatic grounding clamp according to any one of claims 1 to 11, characterized in that: The clamp arm of the electrostatic grounding clamp is wrapped by the second sealed elastic cavity, and the normally closed hand-touch switch is located in the second sealed elastic cavity.

14. The intrinsically safe explosion-proof electrostatic grounding clamp according to any one of claims 1 to 11, characterized in that: The clamp arm of the electrostatic grounding clamp is provided with a movable arm, and the movable arm is connected to the clamp arm through an elastic member. When the clamp arm is held by hand, the normally closed push switch is actuated through the movable arm.

15. The intrinsically safe explosion-proof electrostatic grounding clamp according to any one of claims 1 to 11, characterized in that: The clamp arm is also provided with a hand touch electrode and a normally open push switch. The normally open push switch is connected between the hand touch and the grounding wire. When the clamp arm of the electrostatic grounding clamp is grasped by hand, the normally open push switch is actuated and closed, thereby grounding the hand touch electrode and releasing static electricity from the human body.

16. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 15, characterized in that: The normally open push switch is an explosion-proof push switch.

17. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 15, characterized in that: The normally open push switch is sealed and wrapped in the elastic cavity three to achieve isolation and explosion protection.

18. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 15, characterized in that: The clamp arm is also provided with a hand-touch electrode and a normally-open push switch. The normally-open push switch is composed of a hand-touch electrode and a ground electrode. The hand-touch electrode and the ground electrode are kept separated by elastic force. When the clamp arm of the electrostatic grounding clamp is grasped by hand, the hand-touch electrode and the ground electrode touch and conduct electricity, thereby grounding the hand-touch electrode and releasing static electricity from the human body.

19. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 15, characterized in that: The clamp arm is also provided with a hand-touch electrode and a normally-open push switch. The normally-open push switch is composed of a permanent magnet and a normally-open magnetic control switch. The hand-touch electrode and the permanent magnet are installed together and can move with each other. The permanent magnet and the normally-open magnetic control switch are kept apart and open by elastic force. When the clamp arm of the electrostatic grounding clamp is grasped by hand, the permanent magnet and the normally-open magnetic control switch are close to each other and closed and turned on, thereby grounding the hand-touch electrode and releasing static electricity from the human body.

20. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 15, characterized in that: The clamp arm is also provided with a hand-touch electrode and a normally-open push switch. The normally-open push switch is composed of a permanent magnet and a normally-closed magnetic control switch. The hand-touch electrode and the permanent magnet are installed together and can move with each other. The permanent magnet and the normally-closed magnetic control switch are kept close to each other by elastic force and open. When the clamp arm of the electrostatic grounding clamp is grasped by hand, the permanent magnet and the normally-closed magnetic control switch move away from each other, closing and conducting the switch, thereby grounding the hand-touch electrode and releasing static electricity from the human body.

21. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 9, 10, 11, 19 or 20, characterized in that: The installation positions of the magnetic switch and the permanent magnet can be interchanged.

22. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 21, characterized in that: The magnetic control switch is explosion-proof.

23. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 21, characterized in that: The magnetic switch is a reed switch.

24. The intrinsically safe explosion-proof electrostatic grounding clamp according to any one of claims 16 to 20, characterized in that: A resistor R is connected across the hand touch electrode and the ground wire. When the hand touches the clamp arm of the electrostatic grounding clamp and presses the clamp arm, the static electricity of the human body is pre-discharged through the resistor R. The resistance value is R.

25. The intrinsically safe explosion-proof electrostatic grounding clamp according to claim 24, characterized in that: The resistance value R is: 10 megohm ~ 1000 megohm.

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