Limit switch

Abstract

The utility model relates to the technical field of electrical equipment, in particular to a limit switch, which comprises a base, a rotating piece, a contact strip and a contact head connected with one end of the contact strip, the contact strip is provided with a long through groove, the contact strip is connected with the rotating piece through a bolt piece, and the bolt piece penetrates through the long through groove of the contact strip. The end, away from the contact strip, of the rotating piece extends into the base and is sleeved with a first torsional spring, a first protruding block and a second protruding block are arranged at the positions, corresponding to the two sides of the rotating piece, in the base respectively, the two ends of the first torsional spring abut against the first protruding block and the second protruding block respectively, and the end, close to the contact strip, of the rotating piece is sleeved with a second torsional spring. According to the utility model, a structure which helps the contact strip to reset rapidly is provided, the contact strip can reset rapidly when circuit switching is completed, the control is more accurate and rapid, and the contact strip can be prevented from being touched by mistake to rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a limit switch. Background Art

[0002] Limit switch is a commonly used low-current main control electrical appliance. It uses the collision of the moving parts of the production machinery to make its contacts move to connect or disconnect the control circuit to achieve a certain control purpose. Usually, this type of switch is used to limit the position or stroke of mechanical movement, so that the moving machinery can automatically stop, reverse, change speed or automatically reciprocate at a certain position or stroke, and is widely used in steel, chemical, petroleum, electric power and other industries.

[0003] Patent CN106315453A discloses a limit switch for an elevator, which includes a base, etc. The base is fixed to the boundary frame of the elevator by a small cross bolt, a left limit signal lamp and a right limit signal lamp are arranged on the side of the base, the upper end of the base is connected to the rotating member by a torsion spring, the contact strip is fixed to the rotating member by a large cross bolt, a gasket is arranged between the large cross bolt and the contact strip, a contact head is arranged at the front end of the contact strip, the contact head is fixed to the contact strip by an elastic buckle, a long through groove is arranged in the contact strip, a left limit slider and a right limit slider are arranged on both sides of the contact strip, and a locking member is arranged at the upper end of the rotating member. The present invention can adjust the limit conditions of the strip to meet different working conditions and different limit requirements.

[0004] However, the rotating part on the limit switch of the prior art relies on only a small torsion spring for reset, which causes the contact bar to reset slowly, resulting in a slow response of the on-off control circuit, which in turn causes the movement of the moving machinery to fail to change its action in time, and the contact bar is also at risk of being accidentally touched and rotated. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a limit switch. The utility model has a structure that helps the contact strip to quickly reset. When the contact strip completes circuit switching, it can quickly reset, the control is more precise and rapid, and it can also prevent the contact strip from being accidentally touched and rotated.

[0006] The technical solution adopted by the utility model is as follows: a limit switch, comprising a base, a rotating member, a contact strip and a contact head connected to one end of the contact strip, the contact strip being provided with an elongated through slot, the contact strip being connected to the rotating member by a bolt member and the bolt member passing through the elongated through slot of the contact strip, the rotating member extending to the inside of the base at one end away from the contact strip and being covered with a first torsion spring, a first protrusion and a second protrusion being respectively provided at positions corresponding to both sides of the rotating member inside the base, the two ends of the first torsion spring being respectively abutted against the first protrusion and the second protrusion, the end of the rotating member close to the contact strip being covered with a second torsion spring, one end of the second torsion spring being abutted against a side wall of the base and the other end being abutted against a side wall of the contact strip.

[0007] The side wall of the base abutting against the second torsion spring and the side wall of the contact strip contacting the second torsion spring are located on the same side of the rotating member.

[0008] The torsional force of the second torsion spring is greater than the torsional force of the first torsion spring.

[0009] A first micro switch driven and controlled by a rotating member is also arranged in the base, a stopper is arranged on the inner wall of the base, one end of the first micro switch abuts against the inner wall of the base and the other end abuts against the stopper.

[0010] A second micro switch driven and controlled by the rotating member is also arranged in the base, a mounting hole seat is arranged on the bottom wall of the base, and a positioning hole matched with the mounting hole seat is arranged on the second micro switch.

[0011] The first micro switch is provided with a fixed contact, and the fixed contact is arranged obliquely with respect to the side wall of the micro switch.

[0012] The first micro switch and the second micro switch are both sleeved with sealing rings at one end close to the rotating member.

[0013] The base is penetrated by at least two mounting through holes with parallel axes, and the cross sections of the two mounting through holes intersect to form an elongated through hole.

[0014] The beneficial effects of the utility model are as follows: the utility model has a structure that helps the contact strip to quickly reset, that is, the second torsion spring of the rotating part outer cover provides a greater spring force through the second torsion spring and the first torsion spring, so that the contact strip can be quickly reset when the circuit switching is completed, the control is more precise and rapid, and the contact strip can be prevented from being accidentally rotated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0016] Figure 1 This is a schematic diagram of the structure of the limit switch of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0018] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0019] Figure 4 A schematic diagram of the internal structure of the utility model from another perspective;

[0020] Figure 5 This is a schematic diagram of the internal structure of the utility model in which the first micro switch is installed;

[0021] Figure 6 This is a schematic diagram of the structure of the first micro switch in the utility model;

[0022] Figure 7 It is a structural schematic diagram of the second micro switch in the utility model;

[0023] Figure 8 This is a schematic diagram of the internal structure of the utility model in which the second micro switch is installed;

[0024] In the figure, 1-base, 2-rotating member, 3-contact strip, 4-contact head, 5-long through slot, 6-bolt member, 7-first torsion spring, 8-first protrusion, 9-second protrusion, 10-second torsion spring, 11-positioning hole, 12-stopper, 13-mounting hole seat, 14-fixed contact, 15-sealing ring, 16-mounting through hole, 17-first micro switch, 18-second micro switch. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0027] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0028] like Figures 1 to 8 As shown, an embodiment of the utility model is a limit switch, comprising a base 1, a rotating member 2, a contact strip 3 and a contact head 4 connected to one end of the contact strip 3, wherein the contact strip 3 is provided with an elongated through slot 5, the contact strip 3 is connected to the rotating member 2 by a bolt member 6 and the bolt member 6 passes through the elongated through slot 5 of the contact strip 3, the rotating member 2 extends to the inside of the base 1 at one end away from the contact strip 3 and is covered with a first torsion spring 7, the inside of the base 1 is provided with a first protrusion 8 and a second protrusion 9 at positions corresponding to both sides of the rotating member 2, the two ends of the first torsion spring 7 are respectively abutted against the first protrusion 8 and the second protrusion 9, the end of the rotating member 2 close to the contact strip 3 is covered with a second torsion spring 10, one end of the second torsion spring 10 is abutted against the side wall of the base 1 and the other end is abutted against the side wall of the contact strip 3.

[0029] The beneficial effects of such a setting are as follows. The utility model has a structure that helps the contact strip to quickly reset, i.e., the second torsion spring of the rotating member outer sleeve provides a greater spring force through the second torsion spring in combination with the first torsion spring, so that the contact strip can quickly reset when the circuit switching is completed, and the control is more precise and rapid, and the contact strip can be prevented from being accidentally rotated.

[0030] It is further provided that the side wall of the base 1 abutting against the second torsion spring 10 and the side wall of the contact strip 3 contacting the second torsion spring 10 are located on the same side of the rotating member 2 .

[0031] The beneficial effects of such an arrangement are as follows: the second torsion spring can be installed in any two directions, but the two contact surfaces need to be on the same side relative to the rotating member, respectively providing spring force support in two directions of the contact strip, which can be switched at will and is more practical.

[0032] It is further provided that the torsional force of the second torsion spring 10 is greater than the torsional force of the first torsion spring 7 .

[0033] The beneficial effect of such a configuration is as follows: the second torsion spring has a greater torsional force, providing a faster and more effective restoring effect.

[0034] It is further configured that a first micro switch 17 driven and controlled by the rotating member 2 is provided in the base 1 , a stopper 12 is provided on the inner wall of the base 1 , one end of the first micro switch 17 abuts against the inner wall of the base 1 and the other end abuts against the stopper 12 .

[0035] It is further configured that a second micro switch 18 driven and controlled by the rotating member 2 is also provided in the base 1 , a mounting hole seat 13 is provided on the bottom wall of the base 1 , and the second micro switch 18 is provided with a positioning hole 11 matched with the mounting hole seat 13 .

[0036] In this embodiment, the micro switch includes a first micro switch 17 and a second micro switch 18 , and the size of the first micro switch 17 is larger than that of the second micro switch 18 .

[0037] The beneficial effects of such a setting are as follows: the first micro switch is directly abutted against the base through a block, and installation is convenient. Because the second micro switch is smaller in size, a pin shaft can be inserted into the positioning hole during installation, and the other end of the pin shaft extends into the mounting hole seat, so it can be accurately positioned and firmly installed. The structure of the base facilitates the installation of micro switches of different sizes, and has better adaptability and versatility.

[0038] It is further provided that a fixed contact 14 is provided on the first micro switch 17, and the fixed contact 14 is provided at an angle to the side wall of the micro switch.

[0039] The beneficial effects of such a setting are as follows: the inclined setting of the fixed contact facilitates the electrical connection between the first micro switch and the wire, and the wire can be connected without bending when it is inserted into the base, thereby ensuring that the electrical connection of the wire is normal and firm.

[0040] It is further provided that a sealing ring 15 is sleeved on one end of the first micro switch 17 and the second micro switch 18 close to the rotating member 2 .

[0041] The beneficial effects of such a configuration are as follows: the chamber in the base for installing the first microswitch and the second microswitch will be poured with epoxy resin during final assembly, and a sealing ring is provided to provide space for the movable contacts of the first microswitch and the second microswitch to move, and good sealing is provided.

[0042] It is further provided that the base 1 is penetrated by at least two mounting through holes 16 with parallel axes, and the cross sections of the two mounting through holes 16 intersect to form an elongated through hole.

[0043] The beneficial effects of such a setting are as follows: the mounting through hole is used to install the travel switch on the equipment, and the mounting through holes with multiple intersecting cross sections can facilitate the travel switch to adjust the installation position, and the structure is compact and simple, easy to process, and the base size is reduced.

[0044] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A limit switch, comprising a base (1), a rotating member (2), a contact strip (3), and a contact head (4) connected to one end of the contact strip (3), wherein the contact strip (3) is provided with an elongated through slot (5), the contact strip (3) is connected to the rotating member (2) by a bolt member (6), and the bolt member (6) passes through the elongated through slot (5) of the contact strip (3), the end of the rotating member (2) away from the contact strip (3) extends to the inside of the base (1) and is covered with a first torsion spring (7), the inside of the base (1) is provided with a first convex block (8) and a second convex block (9) at positions corresponding to both sides of the rotating member (2), the two ends of the first torsion spring (7) are respectively against the first convex block (8) and the second convex block (9), and the characteristics are: A second torsion spring (10) is sheathed on one end of the rotating member (2) close to the contact strip (3); one end of the second torsion spring (10) abuts against the side wall of the base (1) and the other end abuts against the side wall of the contact strip (3).

2. The limit switch according to claim 1, characterized in that: The side wall of the base (1) abutting against the second torsion spring (10) and the side wall of the contact strip (3) contacting the second torsion spring (10) are located on the same side of the rotating member (2).

3. The limit switch according to claim 1, characterized in that: The torsional force of the second torsion spring (10) is greater than the torsional force of the first torsion spring (7).

4. The limit switch according to claim 1, characterized in that: A first micro switch (17) driven and controlled by the rotating member (2) is also provided in the base (1); a stopper (12) is provided on the inner wall of the base (1); one end of the first micro switch (17) abuts against the inner wall of the base (1) and the other end abuts against the stopper (12).

5. The limit switch according to claim 4, characterized in that: A second micro switch (18) driven and controlled by the rotating member (2) is also provided in the base (1), a mounting hole seat (13) is provided on the bottom wall of the base (1), and a positioning hole (11) adapted to the mounting hole seat (13) is provided on the second micro switch (18).

6. The limit switch according to claim 4, characterized in that: The first micro switch (17) is provided with a fixed contact (14), and the fixed contact (14) is arranged obliquely with respect to the side wall of the micro switch.

7. The limit switch according to claim 5, characterized in that: The first micro switch (17) and the second micro switch (18) are both sleeved with sealing rings (15) at one end close to the rotating member (2).

8. The limit switch according to claim 1, characterized in that: The base (1) is penetrated by at least two mounting through holes (16) with parallel axes, and the cross sections of the two mounting through holes (16) intersect to form an elongated through hole.

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