Electrostatic grounding device and control method thereof

Abstract

The present application relates to the field of static electricity release elimination, and particularly to a static electricity grounding device and a control method thereof. The static electricity grounding device comprises at least a relay, a control module 1, a resistance detection module 1, and two mutually insulated grounding electrodes, wherein one of the two mutually insulated grounding electrodes is connected in series with a grounding line of the relay to form a grounding loop, the two mutually insulated grounding electrodes and a conductor contacted thereby form a contact loop, the resistance detection module 1 detects a resistance of the contact loop to obtain a detection value r1, and if the detection value r1 is less than or equal to a set resistance value R1, the control module 1 drives the relay to be conductive, so that the one of the two mutually insulated grounding electrodes is connected to the ground line, and the resistance of the grounding loop between the one of the two mutually insulated grounding electrodes and the ground line is ensured to be less than or equal to the set resistance value R1. The beneficial effect is that the grounding is realized by the explosion-proof relay only after the static electricity object and the grounding device are stably contacted, and the intrinsic safety operation in the whole grounding process is realized, and the grounding device is used in an explosion-proof area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of static electricity elimination, in particular to a static electricity grounding device and a control method thereof. BACKGROUND

[0002] The static electricity grounding devices currently applied in explosion-proof places such as petroleum and petrochemical industry include static electricity grounding clamps, static electricity grounding boxes (fixed type and mobile type), which transfer and release static electricity to avoid the harm of static electricity. Static electricity exists in two cases, one is that the original object has static electricity (such as the static electricity generated by the friction between the wheels and the ground of an oil tank truck), and the other is that static electricity is generated in real time (such as the static electricity generated by the friction between oil and pipelines during oil loading and unloading). For the case that the original object has static electricity, contact discharge sparks will be generated when the static electricity grounding clamp is used. For the case that static electricity is generated in real time, contact discharge sparks will also be generated when the grounding is disconnected and then reconnected in the explosion-proof dangerous place 0. SUMMARY

[0003] Intrinsic safety is based on the GB3836.4—201 standard, and explosion-proof electrical appliances are divided into explosion-proof type, increased safety type, and intrinsic safety type. The characteristic of intrinsic safety type electrical equipment is that all circuits are intrinsically safe circuits, that is, the electric sparks and thermal effects generated under normal working or specified fault conditions cannot ignite the specified explosive mixture. That is, this type of electrical appliance is not explosion-proof by the shell and the filling, but the energy of the electric sparks or thermal effects generated by the circuit under normal use or fault is less than 0.28mJ, that is, the minimum ignition energy of the gas concentration of 8.5% (the most explosive concentration).

[0004] The device of the present application can be divided into static electricity grounding clamps, fixed static electricity grounding boxes, and mobile static electricity grounding boxes, and the circuit can be an analog circuit (function module circuit) or a single-chip microcomputer circuit (program control circuit).

[0005] The purpose of the present application is to conduct grounding by the explosion-proof relay after the stable contact (contact resistance less than the set value) between the static electricity object and the grounding device, so that static electricity sparks will not be generated when the static electricity object and the grounding device are in contact, and the conduction of the explosion-proof relay is explosion-proof (explosion-proof or intrinsically safe type), so that the intrinsic safety operation of the whole grounding process can be realized.

[0006] The technical scheme of the present application is:

[0007] An electrostatic grounding device, characterized in that: at least including a relay, a control module 1, a resistance detection module 1, two mutually insulated grounding electrodes, one of which is connected in series with the grounding line of the relay to form a grounding loop, the two mutually insulated grounding electrodes and the conductor contacted thereby form a contact loop, the resistance detection module 1 detects the resistance of the contact loop to obtain a detection value r1, and if the detection value r1 is less than or equal to a set resistance value R1, the control module 1 drives the relay to turn on, realizing that one of the grounding electrodes is connected to the ground wire, and ensuring that the resistance of the grounding loop between the grounding electrode and the ground wire is less than or equal to the set resistance value R1.

[0008] An electrostatic grounding device, characterized in that: at least including a dual-channel relay, a control module 1, a resistance detection module 1, a resistance detection module 2, two mutually insulated grounding electrodes 1 and 2, the grounding electrode 1 is connected in series with one of the grounding lines a of the relay to form a grounding loop, the grounding electrode 2 is connected in series with the other grounding line b of the relay through the resistance detection module 2, the grounding electrode 1, the resistance detection module 1, and the grounding electrode 2 form a contact loop, the grounding electrode 1, one channel of the dual-channel relay, the ground wire a, the ground wire b, the other channel of the dual-channel relay, the resistance detection module 2, and the grounding electrode 2 form a grounding detection loop, the resistance detection module 1 detects the resistance of the contact loop to obtain a detection value r1, and if the detection value r1 is less than or equal to a set resistance value R1, the control module 1 drives the dual-channel relay to turn on both channels, realizing that the grounding electrode 1 and the ground wire are connected, and the resistance detection module 2 detects the resistance of the grounding loop to obtain a detection value and provides it to the control module 1 for monitoring the grounding resistance of the grounding loop and providing an alarm function.

[0009] The electrostatic grounding device, characterized in that: the electrostatic grounding device is an electrostatic grounding clamp, and the grounding electrode is a grounding tooth of the electrostatic grounding clamp.

[0010] The electrostatic grounding device, characterized in that: the electrostatic grounding device is a fixed electrostatic grounding box, and the two mutually insulated grounding teeth of the electrostatic clamp 1 are connected to the internal circuit of the electrostatic grounding box as grounding electrodes.

[0011] An electrostatic grounding device, characterized in that: the electrostatic grounding device is a mobile electrostatic grounding box, two mutually insulated grounding teeth 1 and 2 of an electrostatic clamp 1 are connected to the internal circuit of the electrostatic grounding box as grounding electrodes, two mutually insulated grounding teeth 3 and 4 of an electrostatic clamp 2 are connected to the internal circuit of the electrostatic grounding box as grounding electrodes, the internal circuit of the electrostatic grounding box at least includes a double-way relay, a control module 1, a resistance detection module 1, a resistance detection module 2, a control module 2, a resistance detection module 3, and an AND gate module, a contact circuit 1 of the electrostatic clamp 1 is composed of the grounding tooth 1, the resistance detection module 1, and the grounding tooth 2, the resistance detection module 1 detects the resistance of the contact circuit 1 to obtain a detection value r1, if the detection value r1 is less than or equal to a set resistance value R1, the control module 1 sends an on driving signal to an input end 1 of the AND gate module, a contact circuit 2 of the electrostatic clamp 2 is composed of the grounding tooth 3, the resistance detection module 3, and the grounding tooth 4, the resistance detection module 3 detects the resistance of the contact circuit 2 to obtain a detection value r2, if the detection value r2 is less than or equal to the set resistance value R1, the control module 2 sends an on driving signal to an input end 2 of the AND gate module, when both input ends of the AND gate obtain the on driving signal, the output end of the AND gate module drives the double-way relay to be on, that is, when the contact resistances of the contact circuit 1 and the contact circuit 2 are both less than or equal to the set resistance value R1, the double-way relay is turned on to make the grounding tooth of the electrostatic clamp 1 and the grounding tooth of the electrostatic clamp 2 be on to realize a grounding circuit, the resistance detection module 2 detects the resistance of the grounding circuit to obtain a detection value and provide it to the control module 1 for monitoring the grounding resistance of the grounding circuit and providing an alarm function.

[0012] The electrostatic grounding device, characterized in that: a photoelectric coupler is arranged at at least one input end of the AND gate module.

[0013] The electrostatic grounding device, characterized in that: the relay is an explosion-proof relay.

[0014] The electrostatic grounding device, characterized in that: the relay is sealed by an explosion-proof cover.

[0015] The electrostatic grounding device, characterized in that: the relay is a solid-state relay.

[0016] The electrostatic grounding device, characterized in that: the relay is a magnetic reed relay, and the magnetic reed is filled with pressure-resistant insulating oil.

[0017] The electrostatic grounding device, characterized in that: an indicating lamp is arranged for contact circuit resistance alarm or / and grounding circuit resistance alarm.

[0018] The electrostatic grounding device, characterized in that: a buzzer is arranged for contact circuit resistance alarm or / and grounding circuit resistance alarm.

[0019] The electrostatic grounding device is characterized in that the resistance value R1 is set to 50 Ω.

[0020] The control method of the electrostatic grounding device is characterized in that it comprises the steps of:

[0021] (1) detecting the resistance value r1 of the grounding tooth contact circuit resistance;

[0022] (2) judging the resistance value, if r1 > the set resistance value R1, returning to step (1) and issuing a poor contact red R display; if r1 ≤ the set resistance value R1, executing step (3);

[0023] (3) delaying t;

[0024] (4) driving the relay to turn on.

[0025] The control method of the electrostatic grounding device is characterized in that it comprises the steps of:

[0026] (1) detecting the resistance value r1 of the grounding tooth contact circuit resistance;

[0027] (2) judging the resistance value, if r1 > the set resistance value R1, returning to step (1) and issuing a poor contact red R display; if r1 ≤ the set resistance value R1, executing step (3);

[0028] (3) delaying t;

[0029] (4) driving the relay to turn on.

[0030] (5) detecting the resistance value r2 of the grounding circuit resistance;

[0031] (6) judging the resistance value, if r2 > the set resistance value R2, returning to step (5) and issuing a poor contact red R display; if r2 ≤ the set resistance value R2, performing a safe grounding display G.

[0032] The control method of the electrostatic grounding device is characterized in that it further comprises the steps of continuously repeating steps (5) and (6) to perform dynamic grounding detection.

[0033] The control method of the electrostatic grounding device is characterized in that 0 < t ≤ 5 seconds.

[0034] The control method of the electrostatic grounding device is characterized in that it comprises the steps of:

[0035] (1) detecting the resistance value r1 of the grounding tooth contact circuit resistance;

[0036] (2), if r1 > set resistance value R1, return to step (1) and issue a poor contact red R display; if r1 < set resistance value R1, execute step (3);

[0037] (3), the resistance value r1 is obtained by detecting the resistance of the grounding tooth contact circuit;

[0038] (4), if r1 > set resistance value R1, return to step (1); if r1 < set resistance value R1, execute step (5);

[0039] (5), drive the relay to turn on.

[0040] A control method of an electrostatic grounding device, characterized in that it comprises the steps of:

[0041] (1), the resistance value r1 is obtained by detecting the resistance of the grounding tooth contact circuit;

[0042] (2), if r1 > set resistance value R1, return to step (1) and issue a poor contact red R display; if r1 < set resistance value R1, execute step (3);

[0043] (3), the resistance value r1 is obtained by detecting the resistance of the grounding tooth contact circuit;

[0044] (4), if r1 > set resistance value R1, return to step (1); if r1 < set resistance value R1, execute step (5);

[0045] (5), drive the relay to turn on.

[0046] (6), the resistance value r2 is obtained by detecting the resistance of the grounding circuit;

[0047] (7), if r2 > set resistance value R2, return to step (6) and issue a poor contact red R display; if r2 < set resistance value R2, execute step (7).

[0048] The control method of the electrostatic grounding device, characterized in that it further comprises the steps of: steps (6) ~ (7) are repeatedly performed to dynamically detect the grounding.

[0049] The control method of the electrostatic grounding device, characterized in that it further comprises the steps of: steps (1) ~ (2) can be repeated multiple times.

[0050] The beneficial effect of the present application is that the grounding is conducted by the explosion-proof relay only after the stable contact (contact resistance less than a set value) between the electrostatic object and the grounding device, so that no electrostatic spark is generated when the electrostatic object contacts the grounding device, and the conduction of the explosion-proof relay is explosion-proof (flameproof or intrinsically safe), so that the present application can realize the intrinsically safe operation in the whole grounding process, and further provide the on-off indication and alarm. Of course, the electrostatic grounding device of the present application can also be applied to the electrical grounding device in the explosion-proof area. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 Embodiment of the electrostatic grounding clamp of the present application (contact loop resistance detection).

[0052] Figure 2 Embodiment of the fixed electrostatic grounding box of the present application (contact loop resistance detection).

[0053] Figure 3 Flowchart of the embodiment of the present application. Figure 1 , Figure 2 Flowchart of the embodiment of the present application.

[0054] Figure 4 Another embodiment of the electrostatic grounding clamp of the present application (contact loop resistance detection, grounding loop resistance detection).

[0055] Figure 5 Another embodiment of the fixed electrostatic grounding box of the present application (contact loop resistance detection, grounding loop resistance detection).

[0056] Figure 6 Flowchart of the embodiment of the present application (time delay scheme). Figure 4 , Figure 5 Flowchart of the embodiment of the present application (time delay scheme).

[0057] Figure 7 Embodiment of the mobile electrostatic grounding box of the present application.

[0058] Figure 8 Embodiment of the mobile electrostatic grounding box of the present application provided with a photoelectric coupler.

[0059] Figure 9 Flowchart of the secondary detection scheme of the embodiment of the present application. Figure 1 , Figure 2 Flowchart of the secondary detection scheme of the embodiment of the present application.

[0060] Figure 10 Flowchart of the secondary detection scheme of the embodiment of the present application. Figure 4 , Figure 5 Flowchart of the secondary detection scheme of the embodiment of the present application.

[0061] In the figure: 101 jaw, 102 jaw lip, 103 grounding teeth, 104 grounding teeth, 105 grounding teeth, 106 grounding teeth, 107 jaw lip, 108 resistance detection module 1, 109 control module 1, 110 single-channel relay, 111 jaw, 112 jaw spring, 201 box, 202 grounding teeth, 203 grounding teeth, 204 conventional electrostatic grounding clamp, 401 double-channel relay, 402 resistance detection module 2, 701 resistance detection module 3, 702 control module 2, 704 grounding teeth, 705 grounding teeth, 706 conventional electrostatic grounding clamp, 801 photoelectric coupler, 802 photoelectric coupler. DETAILED DESCRIPTION

[0062] Figure 1 For the embodiment of the electrostatic grounding clamp (contact loop resistance detection), including jaw 101, jaw lip 102, grounding teeth 103, grounding teeth 104, grounding teeth 105, grounding teeth 106, jaw lip 107, resistance detection module 108, control module 109, single-channel relay 110, jaw 111, jaw spring 112, select any two of grounding teeth 103, grounding teeth 104, grounding teeth 105, grounding teeth 106 as the conductive loop, select grounding teeth 105 and grounding teeth 106 as the conductive contact loop in the figure (i.e. form a contact loop with the engaged conductor), grounding teeth 105 and grounding teeth 106 are insulated from each other, the contact loop is composed of grounding teeth 105, resistance detection module 108, and grounding teeth 106, resistance detection module 108 detects the resistance of the contact loop to obtain the detection value r1, the grounding loop is composed of grounding teeth 106, single-channel relay 110, and ground wire a stake, when the electrostatic grounding clamp engages the conductor, the engaged conductor is between grounding teeth 105 and grounding teeth 106, i.e. the engaged conductor is in the conductive loop of the contact loop, if r1≤ set resistance value R1, then single-channel relay 110 is driven by control module 109 to conduct (① end and ② end are conducted), which realizes that grounding teeth 106 connects to the ground wire, assuming that the grounding path is reliable, then it can ensure that the resistance of the grounding loop between the grounding teeth of the electrostatic grounding clamp and the ground wire is less than the set resistance value R1. In this process, the grounding teeth of the electrostatic grounding clamp first engage the conductor, and relay 110 is only conducted under the condition that the contact is ensured, thus avoiding that the electrostatic grounding clamp generates an electric spark at the moment of engaging the conductor, the relay can be selected as an explosion-proof relay, or sealed and explosion-proof, or sealed and explosion-proof by the jaw of the grounding clamp, or a solid-state relay. Set alarm buzzer H, red light tube D1, and green light tube D2, control module 109 outputs an alarm signal according to the detection result of resistance detection module 108: if r1≤ set resistance value R1, then D2 shines green light, if r1> set resistance value R1, then D1 shines red light and alarm sound spectrum is emitted by alarm buzzer H. In order to ensure that the relay is only actuated after the electrostatic grounding clamp stably engages the conductor, the relay can be selected as a delay relay or a program control circuit is adopted.

[0063] Figure 2 This is an embodiment of the fixed electrostatic grounding box of the present invention (contact circuit resistance detection). Figure 1 In one variation of the implementation scheme, the resistance detection module 108, control module 109, and single-channel relay 110 are housed within a enclosure 201. Enclosure 201 can be manufactured as a sealed, explosion-proof type. 204 is a traditional electrostatic grounding clamp (i.e., an electrostatic clip). 202 and 203 are two mutually insulated grounding teeth. A contact circuit is formed by the grounding teeth 202, the resistance detection module 108, and the grounding teeth 203. The resistance detection module 108 detects the resistance of this contact circuit to obtain a detection value r1. The grounding teeth 202 and the single-channel relay... 110. Grounding wire a stake forms a grounding loop. When the electrostatic grounding clamp engages the conductor, the engaged conductor is between grounding teeth 202 and 203, meaning the engaged conductor is in the conductive loop of the contact loop. If r1 ≤ the set resistance value R1, the control module 109 drives the single-channel relay 110 to conduct (terminals ① and ② are connected), thus connecting grounding teeth 202 to the ground wire. Assuming the grounding path is reliable, it ensures that the resistance of the grounding loop between the grounding teeth of the electrostatic grounding clamp and the ground wire is less than the set resistance value R1. During this process, the grounding teeth of the electrostatic grounding clamp engage the conductor first, and the relay 110 only conducts after ensuring good contact. This avoids the electrostatic grounding clamp generating electric sparks at the moment of engaging the conductor. The relay can be an explosion-proof relay, or sealed explosion-proof, or sealed explosion-proof by the clamp arm, or a solid-state relay. Considering the stable engagement of the electrostatic grounding clamp, a time-delay relay can be used. Of course, the time-delay function can also be implemented through circuits or programs. The alarm buzzer H, red LED D1, and green LED D2 are set. The control module 109 outputs an alarm signal based on the detection result of the resistance detection module 108: if r1 ≤ set resistance value R1, D2 lights up green; if r1 > set resistance value R1, D1 lights up red and the alarm buzzer H emits an alarm sound spectrum.

[0064] Figure 3 For the present invention Figure 1 , Figure 2 The flowchart of the implementation plan includes the following steps:

[0065] 301. Obtain the resistance value r1 by detecting the grounding tooth contact circuit resistance;

[0066] 302. Determine the resistance value. If r1 > the set resistance value R1, return to step 301 and display a red R indicator for poor contact. If r1 ≤ the set resistance value R1, proceed to step 303.

[0067] 303. Delay t: Considering the stable engagement of the electrostatic grounding clamp, select 0 < t ≤ 5 seconds;

[0068] 304. Drive the relay to turn on.

[0069] Figure 9 For the secondary detection scheme of the present invention Figure 1 , Figure 2 The flow chart of the secondary detection scheme of the present invention takes into account the stable bite of the electrostatic grounding clamp, Figure 3 The flow chart of the secondary detection scheme of the present invention takes into account the stable bite of the electrostatic grounding clamp, Figure 9 The secondary detection scheme can of course be repeated, i.e. at least twice. The steps include:

[0070] 901. Detect the resistance value r1 of the contact circuit of the grounding teeth.

[0071] 902. Judge the resistance value. If r1 > the set resistance value R1, return to step 301 and issue the red R display of poor contact. If r1 ≤ the set resistance value R1, execute step 903.

[0072] 903. Detect the resistance value r1 of the contact circuit of the grounding teeth.

[0073] 904. Judge the resistance value. If r1 > the set resistance value R1, return to step 901. If r1 ≤ the set resistance value R1, execute step 905.

[0074] 905. Drive the relay to turn on.

[0075] Of course, the steps of 901 and 902 can be repeated multiple times.

[0076] Figure 4 For another embodiment of the electrostatic grounding clamp of the present invention (contact circuit resistance detection, grounding circuit resistance detection), the embodiment takes into account the stable bite of the electrostatic grounding clamp, Figure 1The grounding loop resistance detection and alarm is added to the base of the embodiment, including the clamp arm 101, the clamp jaw 102, the grounding tooth 103, the grounding tooth 104, the grounding tooth 105, the grounding tooth 106, the clamp jaw 107, the resistance detection module 108, the control module 109, the two-way relay 401, the resistance detection module 402, the clamp arm 111, the clamp body spring 112, the a pile and the b pile are two different position points of the same grounding wire pile, any two of the grounding tooth 103, the grounding tooth 104, the grounding tooth 105 and the grounding tooth 106 are selected as the conductive contact loop, the grounding tooth 105 and the grounding tooth 106 are selected as the conductive contact loop in the figure (i.e. form a contact loop with the occluded conductor), the grounding tooth 105 and the grounding tooth 106 are insulated from each other, the grounding tooth 105, the resistance detection module 108 and the grounding tooth 106 constitute a contact loop, the resistance detection module 108 detects the resistance of the contact loop to obtain a detection value r1, the grounding tooth 106, the ② end and the ① end of the two-way relay 401, the grounding wire a pile constitute a grounding loop, the grounding tooth 106, the ② end and the ① end of the two-way relay 401, the grounding wire a pile, the grounding wire b pile, the ③ end and the ④ end of the two-way relay 401, the resistance detection module 402 and the grounding tooth 105 constitute a grounding detection loop, the resistance detection module 402 detects the resistance of the grounding loop to obtain a detection value r2, when the electrostatic grounding clamp occludes the conductor, the occluded conductor is between the grounding tooth 105 and the grounding tooth 106, i.e. the occluded conductor is in the conductive loop of the contact loop, if r1≤ the set resistance value R1, the control module 109 drives the two-way relay 401 to be conductive (the ① end and the ② end are conductive, the ③ end and the ④ end are conductive), the ① end and the ② end are conductive to realize that the grounding tooth 106 is connected to the grounding wire, first, it is ensured that the resistance between the grounding tooth of the electrostatic grounding clamp and the occluded conductor is less than the set resistance value R1, in this process, the grounding tooth of the electrostatic grounding clamp first occludes the conductor, under the condition of ensuring good contact, the relay 401 is only conductive, thus, the electric spark generated by the electrostatic grounding clamp in the moment of occluding the conductor is avoided, the relay can be an explosion-proof relay, or be sealed and explosion-proof, or be sealed and explosion-proof by the clamp arm of the grounding clamp, or be a solid-state relay, considering the stable occlusion of the electrostatic grounding clamp, the relay can adopt a delay relay, of course, the delay function can also be realized by a circuit or a program. The alarm buzzer H, the red light-emitting tube D1 and the green light-emitting tube D2 are arranged, the control module 109 outputs an alarm signal according to the detection result of the resistance detection module 108: if r1≤ the set resistance value R1, the D2 is bright green, if r1> the set resistance value R1, the D1 is bright red and the alarm buzzer H emits an alarm sound spectrum.When the ③ terminal and the ④ terminal of the two-way relay 401 are turned on, the resistance detection module 402 detects the resistance of the grounding loop to obtain a detection value r2. If r2≤ the set resistance value R2, the control module 109 drives the green light emitting tube D4 to display safe grounding. If r2> the set resistance value R2, the control module 109 drives the red light emitting tube D3 to display poor grounding and the alarm buzzer H emits an alarm sound spectrum.

[0077] Figure 5 For another embodiment (contact loop resistance detection, grounding loop resistance detection) of the fixed electrostatic grounding box of the present application, the embodiment is in Figure 2The grounding circuit resistance detection and alarm is additionally added on the basis of the embodiment. The resistance detection module 108, the control module 109 and the double-way relay 401 are arranged in the box 201. The box 201 can be manufactured as a sealed explosion-proof type. The 204 is a traditional electrostatic grounding clamp (i.e. electrostatic clamp). The 202 and 203 are two mutually insulated grounding teeth. The contact circuit is formed by the grounding tooth 202, the resistance detection module 108, the grounding tooth 203 (i.e. and the contact circuit formed by the occluded conductor). The resistance detection module 108 detects the resistance of the contact circuit to obtain the detection value r1. The grounding circuit is formed by the grounding tooth 202, the ② end and the ① end of the double-way relay 401 and the grounding wire a stake. When the electrostatic grounding clamp occludes the conductor, the occluded conductor is between the grounding tooth 202 and the grounding tooth 203, i.e. the occluded conductor is in the conductive circuit of the contact circuit. If r1≤ the set resistance value R1, the control module 109 drives the double-way relay 401 to be conductive (the ① end and the ② end are conductive, and the ③ end and the ④ end are conductive). The ① end and the ② end being conductive realizes that the grounding tooth 202 is connected to the grounding wire. First, it is ensured that the resistance between the grounding tooth of the electrostatic grounding clamp and the occluded conductor is less than the set resistance value R1. In this process, the grounding tooth of the electrostatic grounding clamp first occludes the conductor. The relay 401 is only conductive in the condition of ensuring good contact. Thus, the electric spark generated by the electrostatic grounding clamp in the moment of occluding the conductor is avoided. The relay can be selected from an explosion-proof relay, a sealed explosion-proof relay, a solid-state relay, etc. Considering the stable occlusion of the electrostatic grounding clamp, the relay can be a time-delay relay. Of course, the time-delay function can also be realized by a circuit or a program. The alarm buzzer H, the red light-emitting tube D1 and the green light-emitting tube D2 are arranged. The control module 109 outputs an alarm signal according to the detection result of the resistance detection module 108: if r1≤ the set resistance value R1, the D2 is bright green; if r1> the set resistance value R1, the D1 is bright red and the alarm buzzer H emits an alarm sound spectrum. The grounding detection circuit is formed by the grounding tooth 202, the ② end and the ① end of the double-way relay 401, the grounding wire a stake, the grounding wire b stake, the ③ end and the ④ end of the double-way relay 401, the resistance detection module 402 and the grounding tooth 203. After the ③ end and the ④ end of the double-way relay 401 are conductive, the resistance detection module 402 detects the resistance of the grounding circuit to obtain the detection value r2. If r2≤ the set resistance value R2, the control module 109 drives the green light-emitting tube D4 to display safe grounding. If r2> the set resistance value R2, the control module 109 drives the red light-emitting tube D3 to display poor grounding and the alarm buzzer H emits an alarm sound spectrum.

[0078] Figure 6 For the present application Figure 4 , Figure 5 The flowchart of the embodiment (time-delay scheme) comprises the following steps:

[0079] 601, the resistance value r1 is obtained by detecting the resistance of the grounding tooth contact circuit;

[0080] 602, judge the resistance value, if r1 > set resistance value R1, return to step 601 and issue a poor contact red R display; if r1 < set resistance value R1, execute step 603;

[0081] 603, delay t, considering the stable engagement of the electrostatic grounding clamp, select 0 < t < 5 seconds;

[0082] 604, drive the relay to turn on;

[0083] 605, ground loop resistance detection obtains resistance value r2;

[0084] 606, judge the resistance value, if r2 > set resistance value R2, return to step 605 and issue a poor contact red R display; if r2 < set resistance value R2, perform safe grounding display green G.

[0085] Steps 605-606 are repeatedly repeated to perform dynamic grounding detection.

[0086] Figure 10 For the present application Figure 4 , Figure 5 the flow chart of the secondary detection scheme of the embodiment, considering the stable engagement of the electrostatic grounding clamp, Figure 6 the flow chart adopts the scheme of relay delay turn-on, Figure 10 the scheme of secondary detection, of course, can be multiple, that is, at least twice. Including steps:

[0087] 1001, ground tooth contact loop resistance detection obtains resistance value r1;

[0088] 1002, judge the resistance value, if r1 > set resistance value R1, return to step 1001 and issue a poor contact red R display; if r1 < set resistance value R1, execute step 1003;

[0089] 1003, ground tooth contact loop resistance detection obtains resistance value r1;

[0090] 1004, judge the resistance value, if r1 > set resistance value R1, return to step 1001; if r1 < set resistance value R1, execute step 1005;

[0091] 1005, drive the relay to turn on;

[0092] 1006, ground loop resistance detection obtains resistance value r2;

[0093] 1007, if r2 > set resistance value R2, return to step 1006 and issue a poor contact red R display; if r2 < set resistance value R2, proceed to safety ground display green G.

[0094] Of course, the steps of 1001, 1002 can be repeated multiple times.

[0095] 1006~1007 steps are repeated to perform dynamic ground detection.

[0096] Figure 7 For the mobile electrostatic grounding box embodiment of the present application, the essence of the embodiment is to change the fixed grounding end of the fixed electrostatic grounding box shown in Figure 2 the fixed grounding end of the fixed electrostatic grounding box shown in Figure 2 On the basis of the embodiment, control module 702, resistance detection module 701, and electrostatic clamp 706 are further provided. Electrostatic clamp 706 has mutually insulated grounding teeth 704, 705. The resistance detection module 701 detects the resistance of the contact circuit formed by grounding teeth 704, 705 and electrostatic clamp 706. When electrostatic clamp 706 clamps a conductor, the clamped conductor is between grounding teeth 704 and 705, i.e., in the conductive circuit of the clamping contact circuit of electrostatic clamp 706. If r3 < set resistance value R1, the control module 702 outputs a closing signal. In this embodiment, an AND gate 703 is provided. The two input ends of AND gate 703 are respectively connected to the signal output ends of control module 109 and control module 702. The output end of AND gate 703 is connected to double-relay 401. Only when control module 109 and control module 702 both output closing signals can the output end of the AND gate drive double-relay 401 to actuate and conduct. This ensures that the grounding circuit is only conducted when electrostatic clamp 204 and electrostatic clamp 706 both stably and safely connect to the conductor, avoiding the possibility of static spark when either electrostatic clamp 204 or electrostatic clamp 706 clamps the conductor. Control module 702 controls red light-emitting tube D5, green light-emitting tube D6, and buzzer H1 to realize state alarm of electrostatic clamp 706: D6 emits green light G to indicate that the resistance of the contact circuit of the clamped conductor of electrostatic clamp 706 meets the set requirements, and D5 emits red light R to indicate that the resistance of the contact circuit of the clamped conductor of electrostatic clamp 706 is greater than the set value, while buzzer H1 emits an alarm sound spectrum 1.

[0097] Figure 7The grounding loop of the embodiment is the loop formed by the connection of the double-way relay 401 between the electrostatic clamp 204 and the electrostatic clamp 706, that is, after the double-way relay 401 is turned on, the grounding loop is composed of the grounding tooth 202, the ② end of the double-way relay 401, the ① end of the double-way relay 401, and the grounding tooth 705, the grounding detection loop is composed of the grounding tooth 203, the resistance detection module 402, the ④ end of the double-way relay 401, the ③ end of the double-way relay 401, and the grounding tooth 704, and the grounding loop detection is implemented by the control module 109 through the resistance detection module 402.

[0098] Figure 8 The embodiment of the mobile electrostatic grounding box of the application is provided with photoelectric couplers, considering that the electrostatic clamp 204 and the electrostatic clamp 706 respectively engage the ground wire and the released electrostatic conductor, the electrostatic voltage of the released electrostatic conductor to the ground can be very high (thousands of volts to tens of thousands of volts), and the breakdown voltage of the ordinary circuit is generally lower than 1000 volts, so the photoelectric couplers 801 and 802 are provided, the photoelectric coupler can be provided with only one, of course, two photoelectric couplers can also be provided, that is, at least one of the input ends of the gate 703 is provided with a photoelectric coupler, and the photoelectric coupler optoelectronically isolates the circuit related to the electrostatic clamp 204 and the circuit related to the electrostatic clamp 706, avoiding the high-voltage electrostatic breakdown of the detection and control circuit.

[0099] Since the electrostatic voltage is generally several thousand to several ten thousand volts, the relay in the application should be selected from a relay with high withstand voltage, and here an oil-immersed reed relay is provided. Since the two electrical contacts of the reed relay are located in a closed space, it is an explosion-proof device. Even if the electrical contacts of the reed relay produce an electric spark, it will not be transmitted to the outside, so it is an intrinsically safe explosion-proof device. In addition, considering the withstand voltage of the reed relay, a vacuum reed relay can be used and the gap between the electrodes can be increased. As another solution, the reed relay can be filled with insulating oil to form an oil-immersed reed relay (see patent application 2020103348286 for details). If transformer oil is used, the withstand voltage of the transformer oil can reach more than 4000 kV / cm. The main components of the transformer oil are naphthenes, alkanes, and aromatic hydrocarbons, and the relative dielectric constant ε of the transformer oil is between 2.2 and 2.4. One feature of the oil-immersed reed relay is that it has a delay open circuit or a delay closed circuit. In this case, even if a delay circuit or program is not provided, the delay closed circuit of the normally open reed relay is beneficial to the delay effect of the application (i.e., the reed relay is turned on only after the grounding tooth and the conductor are stably connected).

[0100] According to the electrostatic grounding specification, the grounding resistance is required to be less than 100 Ω, and the application Figure 1 , Figure 2 In the embodiment, it is assumed that all connections except the grounding tooth are reliable, and the grounding tooth contact resistance is required to be less than 100 Ω; the application Figure 4 , Figure 5In the embodiment, the resistance of the grounding path is considered, the grounding path and the grounding tooth path are connected in series, so the resistance of the grounding path is required to be less than 50Ω, and the resistance of the grounding tooth path is required to be less than 50Ω. Therefore, the setting value of R1 and R2 can be set as 50Ω. Of course, the resistance value given in the present application can be understood as a recommended value, which is not necessarily limited to the protection scope of the present application, and is specifically executed according to the standard of the relevant industry.

[0101] The circuit of the present application can be powered by a battery to meet the requirement of intrinsic safety.

[0102] The above application modes and rules do not limit the basic characteristics of the method and application of the present application, and are not limited to the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An electrostatic grounding device, characterized by: The device comprises a relay, a control module I, a resistance detection module I, two mutually insulated grounding electrodes, one of which is connected in series with the grounding line of the relay to form a grounding loop, and the two mutually insulated grounding electrodes and the conductor contacted thereby form a contact loop, the resistance detection module I detects the resistance of the contact loop to obtain a detection value r1, and if the detection value r1 is less than or equal to a set resistance value R1, the control module I drives the relay to turn on, thereby connecting the one grounding electrode to the ground line and ensuring that the resistance of the grounding loop between the one grounding electrode and the ground line is less than or equal to the set resistance value R1.

2. An electrostatic grounding device, characterized by: The device comprises a double-path relay, a control module I, a resistance detection module I, a resistance detection module II, two mutually insulated grounding electrodes I and II, the grounding electrode I is connected in series with one path of the grounding line a post of the relay to form a grounding loop, the grounding electrode II is connected in series with the other path of the grounding line b post of the relay through the resistance detection module II, the grounding electrode I, the resistance detection module I and the grounding electrode II form a contact loop, the grounding electrode I, one path of the double-path relay, the ground line a post, the ground line b post, the other path of the double-path relay, the resistance detection module II and the grounding electrode II form a grounding detection loop, the resistance detection module I detects the resistance of the contact loop to obtain a detection value r1, and if the detection value r1 is less than or equal to a set resistance value R1, the control module I drives the double-path relay to turn on both paths, thereby connecting the grounding electrode I to the ground line, the resistance detection module II detects the resistance of the grounding loop to obtain a detection value and provides it to the control module I, and the control module I monitors the grounding resistance of the grounding loop and provides an alarm function.

3. An electrostatic grounding device according to claim 1 or 2, characterised in that: The electrostatic grounding device is an electrostatic grounding clamp, and the grounding electrode is a grounding tooth of the electrostatic grounding clamp.

4. An electrostatic grounding device according to claim 1 or 2, characterised in that: The electrostatic grounding device is a fixed electrostatic grounding box, and the two mutually insulated grounding teeth of the electrostatic clamp I are connected to the internal circuit of the electrostatic grounding box as grounding electrodes.

5. An electrostatic grounding device, characterized by: The static grounding device is a mobile static grounding box, two mutually insulated grounding teeth I and II of the static grounding clamp I are connected to the internal circuit of the static grounding box as grounding electrodes, two mutually insulated grounding teeth III and IV of the static grounding clamp II are connected to the internal circuit of the static grounding box as grounding electrodes, the internal circuit of the static grounding box comprises a double-way relay, a control module I, a resistance detection module I, a resistance detection module II, a control module II, a resistance detection module III, and an AND gate module, a contact circuit I of the static grounding clamp I is formed by the grounding teeth I, the resistance detection module I, and the grounding teeth II, the resistance detection module I detects the resistance of the contact circuit I to obtain a detection value r1, if the detection value r1 is less than or equal to a set resistance value R1, the control module I sends an on driving signal to an input end I of the AND gate module, a contact circuit II of the static grounding clamp II is formed by the grounding teeth III, the resistance detection module III, and the grounding teeth IV, the resistance detection module III detects the resistance of the contact circuit II to obtain a detection value r2, if the detection value r2 is less than or equal to the set resistance value R1, the control module II sends an on driving signal to an input end II of the AND gate module, when both input ends of the AND gate obtain the on driving signal, the output end of the AND gate module drives the double-way relay to be on, that is, when the contact resistances of the contact circuit I and the contact circuit II are both less than or equal to the set resistance value R1, the double-way relay is turned on to make the grounding teeth of the static grounding clamp I and the grounding teeth of the static grounding clamp II be on to realize a grounding circuit, the resistance detection module II detects the resistance of the grounding circuit to obtain a detection value and provide the detection value to the control module I, and the control module I is used to monitor the grounding resistance of the grounding circuit and provide an alarm function.

6. An electrostatic grounding device according to claim 5, characterised in that: A photoelectric coupler is arranged at at least one input end of the AND gate module.

7. An electrostatic grounding device according to claim 1 or 2 or 5 or 6, characterised in that: The relay is an explosion-proof relay.

8. An electrostatic grounding device according to claim 1 or 2 or 5 or 6, characterized in that: The relay is sealed by an explosion-proof cover.

9. An electrostatic grounding device according to claim 1 or 2 or 5 or 6, characterized in that: The relay is a solid-state relay.

10. An electrostatic grounding device according to claim 1 or 2 or 5 or 6, characterized in that: The relay is a magnetic reed relay, and the magnetic reed is filled with pressure-resistant insulating oil.

11. An electrostatic grounding device according to claim 1 or 2 or 5 or 6, characterized in that: An indicating lamp is arranged for contact circuit resistance alarm or / and grounding circuit resistance alarm.

12. An electrostatic grounding device according to claim 1 or 2 or 5 or 6, characterized in that: A buzzer is arranged for contact circuit resistance alarm or / and grounding circuit resistance alarm.

13. An electrostatic grounding device according to claim 1 or 2 or 5 or 6, characterized in that: The set resistance value R1 is 50Ω.

14. A control method of a static grounding device, using the static grounding device according to claim 3 or 4, comprising the steps of: (1) detecting the resistance value r1 of the grounding teeth contact circuit; (2) judging the resistance value, if r1 > the set resistance value R1, returning to step (1) and sending a poor contact red R display, if r1 ≤ the set resistance value R1, executing step (3); (3) delaying t; (4) driving the relay to be on.

15. A control method of a static grounding device, using the static grounding device according to claim 3 or 4, comprising the steps of: (1) detecting the resistance value r1 of the grounding teeth contact circuit; (2) judging the resistance value, if r1 > set resistance value R1, returning to step (1) and issuing a poor contact red R display; if r1 < set resistance value R1, executing step (3); (3) time delay t; (4) driving the relay to turn on; (5) detecting the ground loop resistance to obtain resistance value r2; (6) judging the resistance value, if r2 > set resistance value R2, returning to step (5) and issuing a poor contact red R display; if r2 < set resistance value R2, performing a safe ground display green G.

16. The control method of an electrostatic grounding device according to claim 15, wherein Further comprising steps: steps (5)~(6) are repeatedly performed to conduct dynamic ground detection.

17. A method of controlling an electrostatic grounding device according to claim 14 or 15 or 16, characterized in that: 0 < t < 5 seconds.

18. A control method of an electrostatic grounding device, using the electrostatic grounding device according to claim 3 or 4, characterized by comprising steps of: (1) detecting the ground tooth contact loop resistance to obtain resistance value r1; (2) judging the resistance value, if r1 > set resistance value R1, returning to step (1) and issuing a poor contact red R display; if r1 < set resistance value R1, executing step (3); (3) detecting the ground tooth contact loop resistance to obtain resistance value r1; (4) judging the resistance value, if r1 > set resistance value R1, returning to step (1); if r1 < set resistance value R1, executing step (5); (5) driving the relay to turn on.

19. A control method of an electrostatic grounding device, using the electrostatic grounding device according to claim 3 or 4, characterized by comprising steps of: (1) detecting the ground tooth contact loop resistance to obtain resistance value r1; (2) judging the resistance value, if r1 > set resistance value R1, returning to step (1) and issuing a poor contact red R display; if r1 < set resistance value R1, executing step (3); (3) detecting the ground tooth contact loop resistance to obtain resistance value r1; (4) judging the resistance value, if r1 > set resistance value R1, returning to step (1); if r1 < set resistance value R1, executing step (5); (5) driving the relay to turn on; (6) detecting the ground loop resistance to obtain resistance value r2; (7) judging the resistance value, if r2 > set resistance value R2, returning to step (6) and issuing a poor contact red R display; if r2 < set resistance value R2, performing a safe ground display green G.

20. The control method of an electrostatic grounding device according to claim 19, wherein Further comprising steps: steps (6)~(7) are repeatedly performed to conduct dynamic ground detection.

21. A method of controlling an electrostatic grounding device according to claim 18 or 19 or 20, characterized in that, Further comprising steps: steps (1)~(2) are repeated multiple times.

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