Slide rheostat

Abstract

The utility model relates to the technical field of rheostats, in particular to a slide rheostat which is internally provided with a main box body, a guide cavity connected with the outside is arranged in the main box body, a positioning rack is fixedly arranged between the left wall and the right wall of the guide cavity, a coil is fixedly arranged on the outer circle face of the positioning rack, and a supporting rack is fixedly arranged on the rear end face of the main box body. A sliding cavity connected with the outside is formed in the supporting rack, a metal sliding block capable of moving left and right is arranged in the sliding cavity, an insulating shell is fixedly arranged on the outer circle face of the metal sliding block, a feeding rack capable of moving up and down is arranged on the front side of the insulating shell, and two sets of damping springs which are symmetrical front and back and can stretch out and draw back are fixedly arranged on the lower end face of the feeding rack. And the contact distance between the slip sheet and the coil can be adjusted, so that the situation that the traditional slip sheet is in long-time contact with the coil, so that scratches and damage are caused, the experiment precision is influenced, large errors are caused, and the use effect of the rheostat is poor is further prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of rheostats, in particular to a sliding rheostat. Background Art

[0002] The sliding rheostat is a circuit element that can change its own resistance to control the circuit. In circuit analysis, the sliding rheostat can be used as a fixed resistor or a variable resistor. The sliding rheostat generally consists of five parts: a terminal, a slider, a coil, a metal connecting rod, and a porcelain tube. During the use of the existing sliding rheostat, the slider and the coil will wear out due to long-term use, which will lead to poor contact during experiments or use, and thus make it impossible to accurately adjust the resistance, which further leads to the poor practicality of the rheostat. Utility Model Content

[0003] The purpose of the utility model is to provide a sliding rheostat to overcome the above-mentioned defects in the prior art.

[0004] According to the utility model, a sliding rheostat comprises a main box body, a guide cavity connected to the outside is provided in the main box body, a positioning frame is fixedly provided between the left and right walls of the guide cavity, a coil is fixedly provided on the outer circular surface of the positioning frame, a supporting frame is fixedly provided on the rear end surface of the main box body, a sliding cavity connected to the outside is provided in the supporting frame, a metal slider that can move left and right is provided in the sliding cavity, an insulating shell is fixedly provided on the outer circular surface of the metal slider, a feed frame that can move up and down is provided on the front side of the insulating shell, two groups of shock-absorbing springs that are symmetrical front and back and can move telescopically are fixedly provided on the lower end surface of the feed frame, so that the shock-absorbing spring plays a role in reducing the pressure during contact, a sliding plate that can move up and down is provided in the feed frame, and the upper end surface of the sliding plate is fixedly connected to the other end of the shock-absorbing spring.

[0005] In some embodiments, a sliding shaft is fixedly provided between the left and right walls of the sliding cavity and passes through the left and right walls of the sliding cavity, and the sliding shaft is rotationally matched with the metal sliding block.

[0006] In some embodiments, a threaded screw is rotatably provided on the upper end surface of the insulating shell, and a threaded slider that can move up and down is provided on the outer cylindrical surface of the threaded screw. The threaded slider is threadably matched with the threaded screw, and the front end surface of the threaded slider is fixedly connected to the feed frame. A pressure shaft that can move up and down is provided in the feed frame, and the lower end surface of the pressure shaft is fixedly connected to the slide.

[0007] In some embodiments, metal rings are fixedly provided on the left and right end surfaces of the coil, and screws are rotatably provided on the front end surface of the metal ring.

[0008] Compared with the prior art, the advantages of the utility model are:

[0009] 1. The utility model is connected to the screw outlet through wires, and another set of wires is connected to the sliding shaft. At this time, the sliding insulating shell starts to move left and right along the supporting frame, and reaches the specified position. At this time, the threaded screw is rotated, and the threaded slider and the feed frame start to move downward. At this time, the slider starts to contact the coil, so that the current passes through the coil, thereby realizing the control of the size of the resistance. When the slider contacts the coil, the shock-absorbing spring begins to shrink, thereby ensuring that the slider can resist the coil and preventing damage caused by excessive pressure. Moreover, since the contact distance between the slider and the coil can be adjusted, the traditional slider is further prevented from being in contact with the coil for a long time, which causes scratches and damage, thereby affecting the experimental accuracy and causing large errors, resulting in poor use of the variable resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a left view of the utility model;

[0011] Figure 2 It is a front view of the utility model;

[0012] Figure 3 This utility model Figure 2 Schematic diagram of AA in the middle;

[0013] Figure 4 This utility model Figure 2 Schematic diagram of BB.

[0014] In the figure:

[0015] 11. Main box; 12. Guide cavity; 13. Positioning frame; 14. Coil; 15. Metal ring; 16. Screw; 17. Support frame; 18. Sliding shaft; 19. Sliding cavity; 20. Metal slider; 21. Insulating shell; 22. Threaded screw; 23. Threaded slider; 24. Feed frame; 25. Shock-absorbing spring; 26. Pressure shaft; 27. Slide. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0017] See also Figure 1-Figure 4, is the first embodiment of the utility model, which provides an embodiment of a sliding rheostat, including a main box body 11, wherein a guide cavity 12 connected to the outside is provided in the main box body 11, a positioning frame 13 is fixedly provided between the left and right walls of the guide cavity 12, a coil 14 is fixedly provided on the outer circumferential surface of the positioning frame 13, a supporting frame 17 is fixedly provided on the rear end surface of the main box body 11, a sliding cavity 19 connected to the outside is provided in the supporting frame 17, a metal slider 20 capable of moving left and right is provided in the sliding cavity 19, an insulating shell 21 is fixedly provided on the outer circumferential surface of the metal slider 20, a feeding frame 24 capable of moving up and down is provided on the front side of the insulating shell 21, two groups of shock-absorbing springs 25 which are symmetrical front and back and can move telescopically are fixedly provided on the lower end surface of the feeding frame 24, and then the shock-absorbing spring 25 plays a role in reducing the pressure during contact, a sliding plate 27 capable of moving up and down is provided in the feeding frame 24, and the upper end surface of the sliding plate 27 is fixedly connected to the other end of the shock-absorbing spring 25.

[0018] A sliding shaft 18 is fixedly disposed between the left and right walls of the sliding cavity 19 and penetrates the left and right walls of the sliding cavity 19 . The sliding shaft 18 is rotatably matched with the metal sliding block 20 .

[0019] A threaded screw 22 is rotatably provided on the upper end surface of the insulating shell 21, and a threaded slider 23 capable of moving up and down is provided on the outer circumferential surface of the threaded screw 22. The threaded slider 23 is threadedly matched with the threaded screw 22, and the front end surface of the threaded slider 23 is fixedly connected to the feed frame 24. A pressure shaft 26 capable of moving up and down is provided in the feed frame 24, and the lower end surface of the pressure shaft 26 is fixedly connected to the slide 27.

[0020] Metal rings 15 are fixedly disposed on the left and right end surfaces of the coil 14 , and screws 16 are rotatably disposed on the front end surface of the metal ring 15 .

[0021] Specific workflow:

[0022] When in use, the wires are connected to the screw 16, and another set of wires are connected to the sliding shaft 18. The sliding insulating housing 21 starts to move left and right along the supporting frame 17 to reach the specified position. The threaded screw 22 is rotated, and the threaded slider 23 and the feed frame 24 start to move downward. The slider 27 starts to contact the coil 14, so that the current passes through the coil 14, thereby realizing the control of the size of the resistance. When the slider 27 contacts the coil 14, the shock-absorbing spring 25 starts to shrink, thereby ensuring that the slider 27 can resist the coil 14 and prevent damage caused by excessive pressure. Moreover, since the contact distance between the slider 27 and the coil 14 can be adjusted, the traditional slider 27 is further prevented from being in contact with the coil 14 for a long time, which causes scratches and damage, thereby affecting the experimental accuracy and causing large errors, resulting in poor use of the variable resistor.

[0023] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A sliding rheostat, comprising a main box (11), characterized in that: The main housing (11) is provided with a guide cavity (12) connected to the outside, a positioning frame (13) is fixedly provided between left and right walls of the guide cavity (12), a coil (14) is fixedly provided on the outer circumferential surface of the positioning frame (13), a support frame (17) is fixedly provided on the rear end surface of the main housing (11), a sliding cavity (19) connected to the outside is provided in the support frame (17), and a metal sliding block (20) capable of moving left and right is provided in the sliding cavity (19); An insulating shell (21) is fixedly provided on the outer circumferential surface of the metal slider (20), a feed frame (24) capable of moving up and down is provided on the front side of the insulating shell (21), two groups of shock-absorbing springs (25) that are symmetrical in front and back and capable of telescopic movement are fixedly provided on the lower end surface of the feed frame (24), a sliding plate (27) capable of moving up and down is provided inside the feed frame (24), and an upper end surface of the sliding plate (27) is fixedly connected to the other end of the shock-absorbing spring (25).

2. A sliding resistor according to claim 1, characterized in that: A sliding shaft (18) is fixedly provided between the left and right walls of the sliding cavity (19) and penetrates the left and right walls of the sliding cavity (19), and the sliding shaft (18) is rotationally matched with the metal sliding block (20).

3. A sliding resistor according to claim 1, characterized in that: The upper end surface of the insulating housing (21) is rotatably provided with a threaded screw (22), the outer circumferential surface of the threaded screw (22) is provided with a threaded slider (23) that can move up and down, the threaded slider (23) is threadedly matched with the threaded screw (22), the front end surface of the threaded slider (23) is fixedly connected to the feed frame (24), the feed frame (24) is provided with a pressure shaft (26) that can move up and down, and the lower end surface of the pressure shaft (26) is fixedly connected to the slide (27).

4. A sliding resistor according to claim 1, characterized in that: Metal rings (15) are fixedly provided on the left and right end surfaces of the coil (14), and screws (16) are rotatably provided on the front end surface of the metal ring (15).

Images