Mining tulip contact

Abstract

A mining plum blossom contact comprises a supporting shaft, the outer surface of the supporting shaft is sleeved with an insulating shell, the insulating shell is fixedly installed on a partition plate of an inner cavity of a mining feed switch, the upper end of the supporting shaft penetrates through the insulating shell and is connected with a fixing nut through threads, and an annular plum blossom frame is arranged below the supporting shaft. A plurality of clamping grooves are evenly formed in the outer circumference of the annular plum blossom frame, a contact piece is clamped in each clamping groove, the contact pieces are matched with one another to form a plum blossom-shaped structure with the middle wide and the two ends narrow, the inner side faces of the upper ends of the contact pieces are attached to the outer surface of the supporting shaft, and the upper portions and the lower portions of the outer side surfaces of the contact pieces are sleeved with annular tension springs. The lower end of the insulating shell is provided with a hollow notch, and the contact pieces are located in the hollow notch. According to the utility model, the defects in the prior art are overcome, the plum blossom-shaped contact structure with a wide middle part and two narrow ends is formed by uniformly and densely distributing the contact pieces, and the two ends of the contact pieces are tightly hooped through the annular tension springs, so that the conductive performance between the plug and the support shaft is effectively ensured.

Description

Technical Field

[0001] This utility model relates to the field of mining equipment technology, specifically to a mining plum blossom contact. Background Technology

[0002] In mine power supply switchgear, pluggable contacts are widely used to achieve power-off and power-on functions. Currently, mine power supply switches typically mount the contacts on a partition, which divides the entire internal cavity of the power supply switch into a main cavity and a wiring cavity, with the wiring cavity used for the user's incoming and outgoing wiring.

[0003] However, conventional contacts suffer from problems such as excessive heat generation, small contact area, high insertion and extraction force, high manufacturing cost, and poor insulation performance. Furthermore, existing contacts lack external leads, requiring equipment within the main chamber to be temporarily powered, necessitating access to the wiring chamber for operation, significantly increasing complexity and cost. Therefore, there is an urgent need to design a novel contact structure to address these issues and meet the technical requirements of mining switchgear. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a mining plum blossom contact, which overcomes the deficiencies of existing technologies. By evenly and densely distributing the contact pieces to form a plum blossom-shaped contact structure that is wide in the middle and narrow at both ends, and by using an annular tension spring to tighten the two ends of the contact pieces, the conductivity between the plug and the support shaft is effectively guaranteed.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A mining-grade plum blossom contact includes a support shaft with an insulating shell fitted on its outer surface. The insulating shell is fixedly installed on a partition inside the cavity of a mining power supply switch. The upper end of the support shaft passes through the insulating shell and is connected to a fixing nut via a thread. A circular plum blossom frame is provided below the support shaft. Several slots are evenly formed on the outer circumference of the circular plum blossom frame, and each slot holds a contact piece. The contact pieces cooperate with each other to form a plum blossom-shaped structure that is wide in the middle and narrow at both ends. The inner surface of the upper end of the contact piece is attached to the outer surface of the support shaft. A ring-shaped tension spring is sleeved above and below the outer surface of the contact piece. A hollow slot is formed at the lower end of the insulating shell, and the contact pieces are all located in the hollow slot.

[0007] Preferably, a limiting slot is provided at the bottom of the hollow slot cavity, and a stop pin is fixedly installed on the outer surface of the support shaft, the stop pin engaging with the limiting slot.

[0008] Preferably, the surface of the insulating shell is provided with a wire outlet hole, one end of the external lead is fixedly connected to the support shaft, and the other end of the external lead passes through the wire outlet hole and is connected to an external device.

[0009] Preferably, the upper and lower ends of the outer side of the contact piece are provided with snap-fit ​​grooves, and the annular tension spring is fitted into the snap-fit ​​grooves.

[0010] Preferably, the insulating shell includes a lower shell and an upper shell with an integral structure design, the diameter of the lower shell is larger than the diameter of the upper shell, and a fixing sleeve is fitted on the outer surface of the upper shell.

[0011] Preferably, a limiting groove is provided at the edge of the upper surface of the lower housing.

[0012] Preferably, a spring washer and a flat washer are arranged sequentially below the fixing nut. The spring washer and the flat washer are both fitted onto the outer surface of the support shaft, and the lower surface of the flat washer is in contact with the upper surface of the fixing sleeve.

[0013] This utility model provides a mining-grade plum blossom contact. It has the following beneficial effects: By setting a circular plum blossom frame and opening multiple slots on the outer circumference of the frame to engage multiple contact pieces, the contact pieces are evenly and densely distributed to form a plum blossom-shaped structure that is wider in the middle and narrower at both ends. A ring-shaped tension spring is used to tighten the ends of the contact pieces, effectively ensuring the conductive contact area and connection stability between each contact piece and the plug and support shaft, thereby effectively ensuring the conductivity between the plug and the support shaft. Furthermore, the elasticity of the ring-shaped tension spring allows each contact piece to have a certain outward expansion range when the plug is inserted into the plum blossom contact, greatly reducing the resistance to the plug entering the contact. Moreover, the plum blossom-shaped structure formed by the interaction of the contact pieces creates an outwardly flared, trumpet-shaped interface, providing a guiding effect and ensuring accurate plug insertion. In addition, an insulating shell is fitted onto the outer surface of the support shaft, which is then fixedly installed on the partition inside the mine power supply switch. This ensures the electrical clearance and creepage distance during the entire installation and use of the plum blossom contact. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of the prior art will be briefly introduced below.

[0015] Figure 1 A schematic diagram of the structure of this utility model;

[0016] Figure 2 A schematic diagram of the cross-sectional structure of this utility model;

[0017] Figure 3 A schematic diagram of the installation structure of the support shaft in this utility model;

[0018] Figure 4A schematic diagram of the structure of this utility model in use;

[0019] Explanation of the labels in the diagram:

[0020] 1. Support shaft; 2. Insulating housing; 3. Fixing nut; 4. Circular bracket; 5. Slot; 6. Contact piece; 7. Ring spring; 8. Hollow slot; 9. Limiting slot; 10. Stop pin; 11. External lead wire; 12. Fixing sleeve; 13. Spring washer; 14. Flat washer; 15. Partition; 16. Insulating plate; 17. Plug; 21. Lower housing; 22. Upper housing; 23. Limiting slot. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0022] Example 1, as Figures 1 to 4 As shown, a mining plum blossom contact includes a support shaft 1, an insulating shell 2 fitted on the outer surface of the support shaft 1, the insulating shell 2 being fixedly installed on a partition 15 inside the mining power supply switch, the upper end of the support shaft 1 passing through the insulating shell 2 and being threadedly connected to a fixing nut 3, a circular plum blossom frame 4 being provided below the support shaft 1, a plurality of slots 5 being evenly opened on the outer circumference of the circular plum blossom frame 4, each slot 5 containing a contact piece 6, the middle position of each contact piece 6 being engaged in each slot 5, the contact pieces 6 cooperating with each other to form a plum blossom-shaped structure that is wide in the middle and narrow at both ends, the upper inner side of the contact piece 6 being attached to the outer surface of the support shaft 1, and annular tension springs 7 being sleeved above and below the outer surface of the contact piece 6, the lower end of the insulating shell 2 having a hollow slot 8, the contact pieces 6 being located in the hollow slot 8.

[0023] Working principle:

[0024] In use, as shown in the figure, the insulating shell 2 can be fixedly installed on the partition 15 inside the mine power supply switch, so that one end of the support shaft 1 equipped with the contact piece 6 is located in the main cavity of the mine power supply switch, and the other end of the support shaft 1 is located in the wiring cavity. The plum blossom-shaped contact structure formed by the cooperation of each contact piece 6 corresponds to the plug 17 of the circuit breaker in the main cavity of the mine power supply switch. By controlling the movement of the circuit breaker (specifically, the circuit breaker can be installed on a moving trolley, and the movement of the circuit breaker can be controlled by controlling the forward and backward movement of the moving trolley. This is the prior art. For details, please refer to the application number: CN202322633502.5, patent name: A mine explosion-proof and intrinsically safe permanent magnet low-voltage vacuum power supply switch, so it will not be described in detail here), the plug-in and plug-out action of the circuit breaker plug 17 and the plum blossom-shaped contact structure can be realized, thereby realizing the on and off effect of the circuit breaker.

[0025] In this embodiment, a circular bracket 4 is provided, and multiple slots 5 are formed on the outer circumference of the circular bracket 4 to engage multiple contact pieces 6. This results in the contact pieces 6 being evenly distributed to form a plum blossom-shaped structure that is wider in the middle and narrower at both ends. A ring-shaped tension spring 7 is used to tighten the ends of the contact pieces 6, effectively ensuring the conductive contact area and connection stability between the ends of each contact piece 6 and the plug 17 and the support shaft 1, thereby effectively ensuring the conductivity between the plug and the support shaft 1. Furthermore, the elasticity of the ring-shaped tension spring 7 allows each contact piece 6 to have a certain amount of outward expansion when the circuit breaker plug is inserted between them, significantly reducing the resistance to the plug entering the plum blossom contacts. The plum blossom-shaped structure formed by the interaction of the contact pieces 6 creates an outwardly flared interface, providing a guiding effect and ensuring accurate insertion of the plug. In addition, an insulating shell 2 is fitted on the outer surface of the support shaft 1, so that the insulating shell 2 is fixedly installed on the partition 15 inside the mine power supply switch. Thus, the electrical clearance and creepage distance can be effectively guaranteed during the installation and use of the plum blossom contact through the insulating shell 2.

[0026] In Example 2, as a further preferred embodiment of Example 1, a limiting slot 9 is formed at the bottom of the hollow slot 8. A stop pin 10 is fixedly installed on the outer surface of the support shaft 1, and the stop pin 10 engages with the limiting slot 9. By forming a limiting slot 9 in the hollow slot 8 of the insulating shell 2, the stop pin 10 on the outer surface of the support shaft 1 can be engaged in the limiting slot 9 during installation, thereby achieving a limiting and fixing effect on the support shaft 1 and effectively preventing the support shaft 1 from rotating during use.

[0027] In Example 3, as a further preferred embodiment of Example 1, a wire outlet hole is provided on the surface of the insulating shell 2. One end of the external lead 11 is fixedly connected to the support shaft 1, and the other end of the external lead 11 passes through the wire outlet hole and is connected to the equipment inside the main cavity of the mine power supply switch. This allows the equipment inside the main cavity of the mine power supply switch to directly draw power through the external lead 11 when temporary power is needed, without having to cross into the wiring cavity, thus effectively saving costs.

[0028] In Example 4, as a further preferred embodiment of Example 1, both the upper and lower ends of the outer surface of the contact piece 6 are provided with outward-curving locking grooves, and the annular tension spring 7 is fitted into the locking grooves. The locking grooves not only limit the movement of the annular tension spring 7, ensuring its stable fit within the grooves, but also, through the outward-curving structure of the locking grooves, create an outward-opening trumpet-shaped structure at the interface of the contact piece 6, providing a guiding effect and allowing the plug to enter accurately.

[0029] In Example 5, as a further preferred embodiment of Example 1, the insulating housing 2 includes a lower housing 21 and an upper housing 22 with an integral structure. The diameter of the lower housing 21 is larger than that of the upper housing 22. A fixing sleeve 12 is fitted onto the outer surface of the upper housing 22. A spring washer 13 and a flat washer 14 are sequentially arranged below the fixing nut 3. Both the spring washer 13 and the flat washer 14 are fitted onto the outer surface of the support shaft 1, and the lower surface of the flat washer 14 contacts the upper surface of the fixing sleeve 8. Therefore, during installation, the lower housing 21 of the insulating housing 2 can be passed through the through hole of the partition, allowing it to enter the wiring cavity of the mine power supply switch. Then, the fixing sleeve 12 is fitted onto the outer surface of the lower housing 21. By rotating the fixing nut 3, the flat washer 14 can be pressed against the end face of the fixing sleeve 12. The mating clamping action between the stepped end face of the lower housing 21 and the fixing sleeve 12 ensures that the entire insulating housing 2 is stably fixed to the partition.

[0030] In Embodiment Six, as a further preferred embodiment of Embodiment One, a limiting groove 23 is provided at the edge of the upper surface of the lower housing 21. In this embodiment, an insulating plate 16 can be fixedly installed on the side of the partition inside the cavity of the mine power supply switch, and an oblong hole is provided on the surface of the insulating plate 16, so that the limiting groove 23 at the edge of the upper surface of the lower housing 21 can be precisely engaged in the oblong hole. Thus, the limiting groove 23 and the oblong hole cooperate to achieve the limiting effect on the entire insulating shell 2, so as to effectively prevent the insulating shell 2 from rotating.

[0031] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mining plum blossom contact, characterized in that: The device includes a support shaft (1), an insulating shell (2) fitted on the outer surface of the support shaft (1), the insulating shell (2) being fixedly installed on the partition plate inside the mine power supply switch, the upper end of the support shaft (1) passing through the insulating shell (2) and being connected to a fixing nut (3) by a thread, a circular plum blossom frame (4) being provided below the support shaft (1), a number of slots (5) being evenly opened on the outer circumference of the circular plum blossom frame (4), a contact piece (6) being engaged in each slot (5), and each contact piece (6) cooperating with each other to form a plum blossom-shaped structure that is wide in the middle and narrow at both ends, the inner side of the upper end of the contact piece (6) being attached to the outer surface of the support shaft (1), and a ring-shaped tension spring (7) being sleeved above and below the outer surface of the contact piece (6), a hollow slot (8) being opened at the lower end of the insulating shell (2), and the contact pieces (6) being located in the hollow slot (8).

2. A mining plum blossom contact as described in claim 1, characterized in that: The hollow slot (8) has a limiting slot (9) at the bottom of its inner cavity. A stop pin (10) is fixedly installed on the outer surface of the support shaft (1). The stop pin (10) engages with the limiting slot (9).

3. A mining plum blossom contact as described in claim 1, characterized in that: The insulating shell (2) has a wire outlet hole on its surface. The support shaft (1) is fixedly connected to one end of the external lead wire (11). The other end of the external lead wire (11) passes through the wire outlet hole and is connected to an external device.

4. A mining plum blossom contact as described in claim 1, characterized in that: The upper and lower ends of the outer side of the contact piece (6) are provided with snap-fit ​​grooves, and the annular tension spring (7) is fitted into the snap-fit ​​grooves.

5. A mining plum blossom contact according to claim 1, characterized in that: The insulating shell (2) includes a lower shell (21) and an upper shell (22) with an integral structure design. The diameter of the lower shell (21) is larger than the diameter of the upper shell (22). A fixing sleeve (12) is fitted on the outer surface of the upper shell (22).

6. A mining plum blossom contact according to claim 5, characterized in that: A limiting slot (23) is provided at the edge of the upper surface of the lower housing (21).

7. A mining plum blossom contact according to claim 5, characterized in that: Below the fixing nut (3), spring washer (13) and flat washer (14) are arranged in sequence. Spring washer (13) and flat washer (14) are both fitted on the outer surface of the support shaft (1). The lower surface of flat washer (14) is in contact with the upper surface of fixing sleeve (12).

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