Low-voltage terminal for an explosion-proof electrical apparatus

Abstract

The application relates to the technical field of electrical equipment parts, in particular to a low-voltage wiring terminal for an explosion-proof electrical equipment, which is characterized in that the cable joint is fixed by the crimping threaded column, so that the cable joint is in close contact with the contact head in the connecting socket; the rotating hand screw block in the auxiliary assembly is used in cooperation with the screw column head to provide an auxiliary function for tightening or loosening the crimping threaded column, that is, the crimping threaded column is rotated by the rotating hand screw block, so that the staff can operate conveniently; on the other hand, the crimping threaded column is fastened by the positioning structure, which has a positive effect on improving the contact stability of the cable joint and the contact head; the cylindrical cavity, the communication groove, the first auxiliary cavity and the first filtering through hole are used in cooperation in the crimping threaded column, so that the crimping threaded column has a corresponding heat dissipation auxiliary function on the basis of the crimping effect on the cable joint.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment components technology, and in particular to a low-voltage terminal block for explosion-proof electrical equipment. Background Technology

[0002] A Chinese patent document with publication number CN214313614U discloses a terminal block and electrical equipment. The solution involves a screw mounted on a terminal block and driven by a fastener. Tightening the screw drives the fastener to swing, pressing an external wire inserted between the fastener and the terminal block. The terminal block includes a first sidewall and a second sidewall spaced apart, and a wire-pressing sidewall whose two ends are bent and connected to the first and second sidewalls respectively. The external wire is pressed between the fastener and the wire-pressing sidewall. The second sidewall includes a first plate and a second plate connected in a staggered manner, with the distance between the first plate and the first sidewall being smaller than the distance between the second plate and the first sidewall. The external wire is located between the second plate and the first sidewall. The terminal block is simple to wire and has a small size.

[0003] The above-mentioned solution uses screws to fix the wire ends during wiring, making contact between the wire ends and the internal contacts of the terminal block. However, relying solely on screws for tightening has several drawbacks. Firstly, the stability of the crimping needs improvement. Secondly, after the cable connector is tightened, there is a lack of heat dissipation structure at the contact point between the cable connector and the internal contacts of the terminal block. This means that when the internal temperature is high, it can easily affect the connection. In existing low-voltage terminal blocks used in explosion-proof electrical equipment, when screws are used to fix cable connectors, auxiliary tools are generally required to turn the screws, which places certain demands on the operating space. When the operating space is insufficient, the use of screw-fixed terminal blocks becomes inconvenient.

[0004] To address these issues, this invention proposes a low-voltage terminal block for explosion-proof electrical equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a low-voltage terminal block for explosion-proof electrical equipment to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage terminal block for explosion-proof electrical equipment, comprising a terminal block body and connection sockets equidistantly disposed at one end of the terminal block body, wherein a contact head is provided at the bottom end of the inner cavity of the connection socket;

[0007] The connection socket is plugged into a cable connector, which is located at one end of the connecting cable. A connecting threaded cavity is provided at the top of the connection socket, and the connecting threaded cavity is connected to the connection socket. The top opening of the connecting threaded cavity is provided with a receiving cavity, and an annular protrusion is fixedly provided at the opening of the receiving cavity. An annular groove is provided on the outer annular surface of the annular protrusion. The connecting threaded cavity is connected to a connecting fastening assembly, which presses the cable connector.

[0008] Preferably, the number of sets of the annular protrusion and the receiving cavity are the same, and the opening of the receiving cavity is circular, with the diameter of the opening of the receiving cavity being larger than the diameter of the opening of the connecting threaded cavity.

[0009] Preferably, the connecting fastening assembly includes a crimped threaded post, a stud head, a cylindrical cavity, a connecting groove, a square mating groove, and auxiliary components; the crimped threaded post is threadedly connected to the connecting threaded cavity, and a stud head is fixedly provided at one end of the crimped threaded post.

[0010] Preferably, a cylindrical cavity is provided in the crimped threaded post, and a connecting groove is provided in the threaded post head, and the connecting groove and the cylindrical cavity are connected.

[0011] Preferably, a square mating groove is provided on the top of the stud head, the groove opening of the square mating groove is square, and the square mating groove is connected to the connecting groove body.

[0012] Preferably, the crimped threaded post is positioned by an auxiliary component, which includes an auxiliary component mating block, a rotating hand-tightening block, a first flow channel, a first auxiliary cavity, a first filter through hole, and a positioning structure; the mating block is fixedly disposed at the bottom end of the rotating hand-tightening block, and the mating block is adapted to be inserted into the square mating groove on the top of the stud head.

[0013] Preferably, a first flow groove is provided in the mating plug, a first auxiliary cavity is provided in the rotating hand-tightening block, and the first auxiliary cavity and the first flow groove are connected. The first flow groove is positioned corresponding to the connecting groove in the stud head.

[0014] Preferably, first filter holes are evenly arranged on both sides of the rotating hand-tightening block. The rotating hand-tightening block is positioned by a positioning structure, which includes a first clamping plate, a first threaded slot, a first positioning clamping screw, and a first auxiliary knob. The first clamping plate is symmetrically fixedly arranged on the bottom side of both ends of the rotating hand-tightening block, and a first threaded slot is provided in the first clamping plate. An arc-shaped contact surface is provided on the inner side wall of the first clamping plate. The first positioning clamping screw is threadedly connected to the first threaded slot, and a first auxiliary knob is fixedly provided at one end of the first positioning clamping screw. The end of the first positioning clamping screw is engaged with the annular groove on the outer side of the annular protrusion.

[0015] Preferably, the auxiliary component is replaced by an auxiliary accessory, and the threaded post is positioned by the auxiliary accessory. The auxiliary accessory includes a second mating block, a series bar, a second flow groove, a second auxiliary cavity, a second filter through hole, a second clamping plate, a second threaded hole groove, a second positioning clamping screw, and a second auxiliary knob. The bottom side of the series bar is fixedly provided with second mating blocks at equal intervals. The second mating block is provided with a second flow groove. The series bar is provided with a second auxiliary cavity, and the second auxiliary cavity and the second flow groove are connected. The second mating block is adapted to fit and insert into the square mating groove at the top of the post head.

[0016] Preferably, a second filter through hole is provided at the top of the serial strip, the second filter through holes are evenly arranged to form a mesh area, and the mesh area is staggered with the second docking block; a second clamping plate is symmetrically fixed on the bottom side of both ends of the serial strip, the inner side of the second clamping plate is provided with an arc-shaped surface, and a second threaded groove is provided in the second clamping plate, the second positioning clamping screw is threadedly connected to the second threaded groove, and a second auxiliary knob is fixedly provided at one end of the second positioning clamping screw, and one end of the second positioning clamping screw is adapted to and engaged with the annular groove on the outer side of the annular protrusion.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention relates to an explosion-proof low-voltage terminal block for electrical equipment, comprising a terminal block body and connecting sockets equidistantly disposed at one end of the terminal block body. A contact head is provided at the bottom of the inner cavity of the connecting socket. A cable connector is inserted into the connecting socket, with the cable connector located at one end of a connecting cable. A threaded cavity is provided at the top of the connecting socket, communicating with the connecting socket. A receiving cavity is provided at the top opening of the threaded cavity, and an annular protrusion is fixedly provided at the opening of the receiving cavity. An annular groove is provided on the outer annular surface of the annular protrusion. The threaded cavity is connected to a fastening assembly, wherein the cable connector is pressed and fixed by a crimping threaded post, ensuring tight contact between the cable connector and the contact head in the connecting socket. Meanwhile, the auxiliary components, including a hand-tightening block that works in conjunction with the stud head, assist in tightening or loosening the crimped threaded post. Tightening the hand-tightening block causes the crimped threaded post to rotate, facilitating operation. Furthermore, a positioning structure secures the crimped threaded post by engaging the first positioning locking screw with the annular groove on the outer side of the annular protrusion, improving its stability and enhancing the contact stability between the cable connector and the contact head. Moreover, this design incorporates a cylindrical cavity within the crimped threaded post that works in conjunction with the connecting groove, the first auxiliary cavity, and the first filter through-hole. This allows the crimped threaded post to not only tighten the cable connector but also provide heat dissipation assistance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram on the right side showing the connection between the main body of the terminal block and the connecting fastening assembly structure of the present invention;

[0020] Figure 2 for Figure 1 Enlarged schematic diagram of the structural connection at point A in the middle;

[0021] Figure 3 This is a schematic diagram of the left side of the connection between the main body of the terminal block and the connecting fastening assembly structure of the present invention;

[0022] Figure 4 for Figure 3 Enlarged schematic diagram of the structural connection at point B;

[0023] Figure 5 This is a side view of the terminal block structure of the present invention.

[0024] Figure 6 for Figure 5 Enlarged schematic diagram of the structural connection at point C;

[0025] Figure 7 This is an exploded bottom view of the connection between the crimped threaded post and the auxiliary component structure of the present invention;

[0026] Figure 8 This is an exploded top view of the connection between the crimped threaded post and the auxiliary component structure of the present invention;

[0027] Figure 9 This is a schematic diagram showing the connection between the main body of the terminal block and the auxiliary accessories of the present invention;

[0028] Figure 10 for Figure 9 Enlarged schematic diagram of the structural connection at point D;

[0029] Figure 11 This is a bottom view of the auxiliary accessory structure connection of the present invention;

[0030] Figure 12 for Figure 11 Enlarged schematic diagram of the structural connection at point E in the middle;

[0031] Figure 13 This is a schematic diagram of the left side of the auxiliary accessory structure connection of the present invention;

[0032] Figure 14 for Figure 13 Enlarged schematic diagram of the structural connection at point F.

[0033] In the diagram: Terminal block body 1, connector 11, contact head 12, connecting cable 2, cable connector 21, connecting threaded cavity 3, receiving cavity 31, annular protrusion 32, annular groove 33, crimping threaded post 401, stud head 402, cylindrical cavity 403, connecting groove 404, square mating groove 405, mating block 501, rotating hand-tightening block 502, first flow channel 503, first auxiliary cavity 504, first filter through hole 505, first clamping plate 601, first threaded hole groove 602, first positioning clamping screw 603, first auxiliary knob 604, second mating block 701, series bar 702, second flow channel 703, second auxiliary cavity 704, second filter through hole 705, second clamping plate 706, second threaded hole groove 707, second positioning clamping screw 708, second auxiliary knob 709. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figures 1-8A low-voltage terminal block for explosion-proof electrical equipment includes a terminal block body 1 and connection sockets 11 equidistantly arranged at one end of the terminal block body 1. A contact head 12 is provided at the bottom of the inner cavity of the connection socket 11. The connection socket 11 is plugged into a cable connector 21, which is located at one end of a connecting cable 2. A threaded cavity 3 is provided at the top of the connection socket 11 and is connected to the connection socket 11. A receiving cavity 31 is provided at the top opening of the threaded cavity 31, and an annular protrusion 32 is fixedly provided at the opening of the receiving cavity 31. An annular groove 33 is provided on the outer annular surface of the annular protrusion 32. The threaded cavity 3 is connected to a fastening assembly, which presses the cable connector 21. The number of annular protrusions 32 and receiving cavities 31 is the same, and the opening of the receiving cavity 31 is circular, with the diameter of the opening of the receiving cavity 31 being larger than the diameter of the opening of the threaded cavity 3.

[0036] In this design, the cable connector 21 is clamped and fixed by the crimping threaded post 401, ensuring tight contact between the cable connector 21 and the contact head 12 in the connector 11. Simultaneously, the auxiliary component, a rotating hand-tightening block 502, works in conjunction with the stud head 402 to assist in tightening or loosening the crimping threaded post 401. Rotating the hand-tightening block 502 causes the crimping threaded post 401 to rotate, facilitating operation. Furthermore, the positioning structure secures the crimping threaded post 401. Specifically, the first positioning clamping screw 603 engages with the annular groove 33 on the outer side of the annular protrusion 32 to improve the stability of the crimping threaded post 401, which has a positive effect on improving the contact stability between the cable connector 21 and the contact head 12. Furthermore, this solution also provides a cylindrical cavity 403 in the crimping threaded post 401 that works in conjunction with the connecting groove 404, the first auxiliary cavity 504, and the first filter through hole 505, so that the crimping threaded post 401 not only has a pressing effect on the cable connector 21, but also has a corresponding heat dissipation auxiliary effect.

[0037] The connection and fastening components in this solution include a crimped threaded post 401, a stud head 402, a cylindrical cavity 403, a connecting groove 404, a square mating groove 405, and auxiliary components. The crimped threaded post 401 is threadedly connected to the connecting threaded cavity 402, and a stud head 402 is fixedly provided at one end of the crimped threaded post 401. A cylindrical cavity 403 is provided in the crimped threaded post 401, and a connecting groove 404 is provided in the stud head 402, with the connecting groove 404 and the cylindrical cavity 403 communicating with each other. A square mating groove 405 is provided on the top of the stud head 402, with the groove opening of the square mating groove 405 being square, and the square mating groove 405 communicating with the connecting groove 404. When the cable connector 21 is inserted into the connection socket 11, the cable connector 21 contacts the contact head 12 in the connection socket 11, i.e., the cable connector 21... The head 21 is positioned above the contact head 12. The operator then uses their hands to hold the stud head 402 and rotate it to crimp the threaded post 401. During the rotation, to facilitate the operator's operation, the mating block 501 at the bottom of the rotating hand-tightening block 502 can be inserted into the square mating groove 405 at the top of the stud head 402. Then, by rotating the hand-tightening block 502, the crimping threaded post 401 is rotated. In this process, using the hand-tightening block 502 is less strenuous than directly rotating the crimping threaded post 401 by hand, and it is easier for the operator to operate. Furthermore, no auxiliary tools are needed to rotate the crimping threaded post 401. Even when the operating space does not allow for the use of auxiliary tools, the operation of rotating the crimping threaded post 401 is still relatively convenient, improving the ease and flexibility of connecting the terminal block body 1 and the cable connector 21.

[0038] To further improve the crimping stability of the crimping threaded post 401 to the cable connector 21, this solution uses auxiliary components to position the crimping threaded post 401. These auxiliary components include an auxiliary mating block 501, a rotating hand-tightening block 502, a first flow channel 503, a first auxiliary cavity 504, a first filter through-hole 505, and a positioning structure. The mating block 501 is fixedly disposed at the bottom end of the rotating hand-tightening block 502, and the mating block 501 is adapted to and inserted into the square mating groove 405 on the top of the stud head 402. The mating block 501 contains the first flow channel 503, and the rotating hand-tightening block 502 contains the first auxiliary cavity 504. The cavity 504 and the first flow channel 503 are connected, and the first flow channel 503 corresponds to the connecting channel 404 in the stud head 402. First filter through holes 505 are evenly arranged on both sides of the rotating hand-tightening block 502. The rotating hand-tightening block 502 is positioned by a positioning structure, which includes a first clamping plate 601, a first threaded slot 602, a first positioning clamping screw 603, and a first auxiliary knob 604. The first clamping plate 601 is symmetrically fixed at the bottom sides of both ends of the rotating hand-tightening block 502, and a first threaded slot 602 is provided in the first clamping plate 601. An arc-shaped contact surface is provided on the inner side wall of the first clamping plate 601. A positioning locking screw 603 is threadedly connected to a first threaded slot 602, and a first auxiliary knob 604 is fixedly provided at one end of the first positioning locking screw 603. The end of the first positioning locking screw 603 is engaged with the annular groove 33 on the outer side of the annular protrusion 32. During the rotation of the hand-tightening block 502 to drive the crimping threaded post 401 to rotate, after the crimping threaded post 401 crimps the cable connector 21, at the same time, the first locking plate 601 provided at the bottom of both ends of the hand-tightening block 502 reaches the position of the annular protrusion 32 at the cavity opening of the receiving cavity 31, that is, the inner wall of the first locking plate 601 contacts the outer ring surface of the annular protrusion 32, and the first locking plate 601 is provided with the first auxiliary knob 604. The first threaded slot 602 in 601 is aligned with the groove of the annular groove 33 on the outer side of the annular protrusion 32. Then, the first positioning locking screw 603 is used to tighten the rotating hand-tightening block 502. That is, the first positioning locking screw 603 is rotated through the first auxiliary knob 604 until one end of the first positioning locking screw 603 is engaged in the annular groove 33. The positioning of the rotating hand-tightening block 502 is completed. At the same time, the locking of the crimping threaded post 401 is completed. That is, at this time, rotating the hand-tightening block 502 provides a squeezing limit effect on the crimping threaded post 401. After tightening the crimping threaded post 401, it can prevent the crimping threaded post 401 from loosening in the axial direction.

[0039] This design also includes a cylindrical cavity 403 in the crimped threaded post 401, a connecting groove 404 in the stud head 402, and when the mating block 501 is inserted into the square mating groove 405 at the top of the stud head 402, the first flow groove 503 in the mating block 501 aligns and connects with the connecting groove 404. Furthermore, a first auxiliary cavity 504 is provided in the rotating hand-tightening block 502, and a first filter through hole 505 is provided on the side of the rotating hand-tightening block 502. The combination of the threaded post 401 and the cable connector 21 provides a fastening and clamping effect, while also providing a corresponding auxiliary heat dissipation effect. The purpose of setting the first filter through hole 505 on the side wall of the rotating hand-tightening block 502 is to provide a corresponding anti-slip effect when the operator squeezes the rotating hand-tightening block 502 to rotate it, in addition to providing corresponding heat dissipation. This further improves the convenience of the operator in rotating the hand-tightening block 502.

[0040] Example 2: Based on Example 1, please refer to... Figures 9-14If the installation space for the terminal block is limited, and tightening the lever block 502 would take up space and hinder the installation of other components after securing the threaded post 401 with the auxiliary components, the auxiliary components in this solution can be replaced with auxiliary accessories. The threaded post 401 is positioned using the auxiliary accessories, which include a second mating block 701, a series bar 702, a second flow channel 703, a second auxiliary cavity 704, a second filter through hole 705, a second clamping plate 706, a second threaded slot 707, a second positioning clamping screw 708, and a second auxiliary knob 709. The second mating blocks 701 are equidistantly fixed to the bottom side of the series bar 702. A second flow channel 703 is provided in the second mating block 701, and a second auxiliary cavity 704 is provided in the series bar 702. The auxiliary cavity 704 and the second flow channel 703 are connected. The second docking block 701 is adapted to be inserted into the square docking groove 405 at the top of the stud head 402. A second filter through hole 705 is provided on the top of the series bar 702. The second filter through holes 705 are evenly arranged to form a mesh area. The mesh area and the second docking block 701 are staggered. A second clamping plate 706 is symmetrically fixed on the bottom side of both ends of the series bar 702. The inner side of the second clamping plate 706 is provided with an arc-shaped surface. A second threaded hole groove 707 is provided in the second clamping plate 706. The second positioning clamping screw 708 is adapted to be threadedly connected to the second threaded hole groove 707. A second auxiliary knob 709 is fixedly provided on one end of the second positioning clamping screw 708. One end of the second positioning clamping screw 708 is adapted to be engaged with the annular groove 33 on the outer side of the annular protrusion 32.

[0041] When using auxiliary accessories to secure the crimped threaded posts 401, firstly, for tightening the crimped threaded posts 401, appropriate auxiliary tools can be used to tighten them first, or the hand-tightening block 502 can be used to tighten them first. Then, the hand-tightening block 502 is removed. Next, the second mating blocks 701 on the bottom side of the series bar 702 are simultaneously inserted into the square mating grooves 405 on the top stud heads 402 of each crimped threaded post 401. This tightens the crimped threaded posts 401, and then the second mating blocks 701 located at both ends of the series bar 702 are... The second positioning locking screw 708 on the card plate 706 is tightened again, so that one end of the second positioning locking screw 708 is engaged in the annular groove 33 on the outside of the annular protrusion 32, thereby positioning the series bar 702 and further stabilizing the crimped threaded column 401. The second flow groove 703 provided in the second mating block 701, the second auxiliary cavity 704 provided in the series bar 702, and the second filter through hole 705 provided at the top of the series bar 702 cooperate with the cylindrical cavity 403 in the crimped threaded column 401 to provide a corresponding heat dissipation function.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-voltage terminal for an explosion-proof electrical device, comprising a terminal body (1) and a connecting socket (11) equidistantly arranged at one end of the terminal body (1), wherein a contact head (12) is arranged at the bottom end of the inner cavity of the connecting socket (11); characterized in that The connecting socket (11) is inserted with a cable connector (21) arranged at one end of a connecting cable (2), a connecting threaded cavity (3) is arranged at the top of the connecting socket (11) and is in communication with the connecting socket (11), the top cavity of the connecting threaded cavity (3) is provided with a containing cavity (31), and an annular protrusion (32) is fixedly arranged at the cavity opening position of the containing cavity (31), the outer side ring surface of the annular protrusion (32) is provided with an annular clamping groove (33), the connecting threaded cavity (3) is connected with a connecting and fastening assembly, and the connecting and fastening assembly is used for pressing the cable connector (21); The connecting and fastening assembly comprises a crimping threaded column (401), a stud head (402), a cylindrical cavity (403), a communication groove (404), a square butt joint groove (405) and an auxiliary assembly; the crimping threaded column (401) is threadedly connected with the connecting threaded cavity (3), and the stud head (402) is fixedly arranged at one end of the crimping threaded column (401); A square butt joint groove (405) is arranged at the top of the stud head (402), the shape of the groove opening of the square butt joint groove (405) is square, and the square butt joint groove (405) is in communication with the communication groove (404); The crimping threaded column (401) is positioned by the auxiliary assembly, and the auxiliary assembly comprises a butt joint plug block (501), a rotating hand screw block (502), a first flow-through groove (503), a first auxiliary cavity (504), a first filter through hole (505) and a positioning structure; The first flow-through groove (503) is arranged in the butt joint plug block (501), the first auxiliary cavity (504) is arranged in the rotating hand screw block (502), and the first auxiliary cavity (504) and the first flow-through groove (503) are in communication; and the first flow-through groove (503) is arranged at a position corresponding to the communication groove (404) in the stud head (402). First filter through holes (505) are evenly arranged on both sides of the rotating hand screw block (502), the rotating hand screw block (502) is positioned through the positioning structure, and the positioning structure comprises a first clamping plate (601), a first threaded hole slot (602), a first positioning clamping screw (603) and a first auxiliary knob (604); the first clamping plate (601) is symmetrically and fixedly arranged at the bottom side of the two ends of the rotating hand screw block (502), the first threaded hole slot (602) is arranged in the first clamping plate (601), an arc surface is arranged on the inner side wall of the first clamping plate (601), the first positioning clamping screw (603) is in threaded connection with the first threaded hole slot (602), the first auxiliary knob (604) is fixedly arranged at one end of the first positioning clamping screw (603), and the end of the first positioning clamping screw (603) is clamped with the annular clamping groove (33) on the outer side of the annular convex portion (32).

2. The low-voltage terminal for an explosion-proof electrical apparatus according to claim 1, characterized by: The annular convex portion (32) and the accommodating cavity (31) are arranged in the same number of groups, the cavity opening of the accommodating cavity (31) is circular, and the cavity opening diameter of the accommodating cavity (31) is greater than the cavity opening diameter of the connecting threaded cavity (3).

3. The low-voltage terminal for an explosion-proof electrical apparatus according to claim 1, characterized by: A cylindrical cavity (403) is arranged in the crimping threaded column (401), a communication groove body (404) is arranged in the screw column head (402), and the communication groove body (404) and the cylindrical cavity (403) are in communication.

4. The low-voltage terminal for an explosion-proof electrical apparatus according to claim 1, characterized by: The butt joint plug block (501) is fixedly arranged at the bottom end of the rotating hand screw block (502), and the butt joint plug block (501) is in plug connection with the square butt joint groove (405) at the top of the screw column head (402).

5. The low voltage terminal for an explosion-proof electrical apparatus according to claim 1, characterized in that: The auxiliary assembly is replaced with an auxiliary accessory, the crimping threaded column (401) is positioned through the auxiliary accessory, and the auxiliary accessory comprises a second butt joint plug block (701), a series connection strip body (702), a second flow-through groove body (703), a second auxiliary cavity (704), a second filter through hole (705), a second clamping plate (706), a second threaded hole slot (707), a second positioning clamping screw (708) and a second auxiliary knob (709); the second butt joint plug block (701) is fixedly arranged at the bottom side of the series connection strip body (702) at equal intervals, the second flow-through groove body (703) is arranged in the second butt joint plug block (701), the second auxiliary cavity (704) is arranged in the series connection strip body (702), the second auxiliary cavity (704) and the second flow-through groove body (703) are in communication, and the second butt joint plug block (701) is in plug connection with the square butt joint groove (405) at the top of the screw column head (402).

6. A low voltage terminal for an explosion-proof electrical apparatus according to claim 5, characterized in that: Second filter through hole (705) is arranged at top of series connection strip (702), second filter through hole (705) is uniformly arranged, and the uniformly arranged second filter through hole (705) forms a mesh area, and the mesh area is staggered with the second butt joint plug block (701);Second clamping plate (706) is symmetrically and fixedly arranged at the bottom of both ends of series connection strip (702), the inner side of second clamping plate (706) is provided with an arc surface, and second threaded hole slot (707) is arranged in second clamping plate (706), second positioning clamping screw (708) is threadedly connected with second threaded hole slot (707), second auxiliary knob (709) is fixedly arranged at one end of second positioning clamping screw (708), and one end of second positioning clamping screw (708) is clamped with the annular clamping groove (33) outside the annular convex part (32).

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