Signal switching mechanism of two-station switch

Abstract

A signal switching mechanism of a two-station switch comprises a case, a transmission device is connected in the case through a support, a mounting plate is arranged on the support, a cam is rotationally connected to the mounting plate, a travel switch is arranged on the periphery of the cam, and the transmission device drives the cam to rotate forwards and backwards to press the travel switch. The travel switch comprises a first travel switch, a second travel switch and a third travel switch which are arranged clockwise; a first flange and a second flange are clockwise arranged on the outer edge of the cam at intervals; at the opening position, the first flange is located between the first travel switch and the second travel switch, and the second flange presses the third travel switch; and at the closing position, the first flange and the second flange respectively press the first travel switch and the second travel switch in sequence, and the second flange releases the third travel switch. The delay trigger of the travel switch is realized, and then the delay determination of the opening and closing in-place signal output is realized, so that the safety of equipment operation is improved, and foreign project standards are met.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment operating mechanisms, in particular to a signal switching mechanism for a two-position switch. Background Art

[0002] The signal switching device is a commonly used electrical switch device with a wide range of applications. Its main structure is to change the switch state of the travel switch through a transmission mechanism, output a position signal, and realize the function of one-button sequential control. For example, document No. CN 216435701U discloses an improved three-position mechanism one-button sequential control device.

[0003] However, the existing signal switching mechanism, in use, realizes one-button sequential control by pressing the travel switch simultaneously with the cam, and cannot fully judge the output of the opening and closing signal corresponding to each travel switch. There is a situation where the opening and closing are not in place, resulting in the discharge of the circuit breaker, arcing, leakage, and even explosion in severe cases. Especially in some foreign projects, there are strict requirements on the safety of electrical switch equipment.

[0004] In order to fully judge the opening and closing signal output of the mechanism, we optimized the existing structure and designed a two-position signal switching mechanism to make up for the above shortcomings. Utility Model Content

[0005] In view of the problems and shortcomings in the prior art, the utility model provides a signal switching mechanism for a two-position switch, which delays the triggering of travel switches at different positions by improving the cam structure, thereby meeting the manufacturer's timing requirements and accurately judging the triggering status of each travel switch.

[0006] The technical solution of this utility model is as follows:

[0007] A signal switching mechanism for a two-position switch, comprising a chassis and a transmission device, wherein the transmission device is connected to the chassis via a bracket, a mounting plate is provided above the bracket, a cam is rotatably connected to the mounting plate, travel switches are arranged at intervals on the periphery of the cam, and the transmission device presses the travel switch by driving the cam to rotate forward and reversely;

[0008] The travel switch comprises a first travel switch, a second travel switch and a third travel switch which are arranged clockwise;

[0009] A first flange and a second flange are arranged on the outer edge of the cam in a clockwise manner;

[0010] The spacing distance between the first flange and the second flange and the spacing distance between the first travel switch and the second travel switch are set as:

[0011] In the open position, the first flange is located between the first travel switch and the second travel switch, so that they are in an open state, and the second flange presses the third travel switch to close;

[0012] When in the closing position, the first flange first presses the first travel switch to close, the second flange then presses the second travel switch to close, and releases the third travel switch to open.

[0013] Working principle: in the initial position, the cam is in the open state, that is, the first flange is located between the first and second travel switches, the rollers of the first and second travel switches are in the released state, disconnected from the circuit, and the three travel switches are in the pressed state; when the cam rotates 90° counterclockwise under the drive of the transmission device, the cam is in the closed state. At this time, the first flange first presses the first travel switch. After a certain period of time, as the cam rotates, the front end of the second flange begins to press the second travel switch, and then continues to rotate to 90°, the rear end of the second flange releases the roller of the third travel switch, and the front end continues to press the second travel switch. At the same time, the first flange maintains the pressed state with the first travel switch, thereby realizing the delayed triggering of the second travel opening and the first travel switch, and finally closing the switch.

[0014] In a specific embodiment, the spacing L1 between the rollers of the first travel switch and the rollers of the second travel switch is greater than the arc length of the first flange, and less than the arc length L2 between the first flange and the starting edge of the second flange.

[0015] Specifically, the travel switches are arranged at equal intervals, that is, L1=L3, and the center angle between L1 and L3 is 90°-110°. The angle of the cam's forward or reverse rotation is 90°. The center angle of the second flange is 120°, and its starting edge is horizontal, and the extension line passes through the center of the cam. The center angle of the first flange is 40°-50°. The specific values ​​of the spacings L1 and L3 between the first travel switch, the second travel switch and the third travel switch are calculated based on the radius of the cam and the width of the first flange and the second flange, and are not described in detail here.

[0016] In a specific embodiment, the transmission device includes a driving mechanism and a transmission mechanism connected to the bracket, the driving mechanism is used to provide power, the transmission mechanism is used to drive the cam to rotate, and the transmission mechanism includes:

[0017] A driving shaft is vertically rotatably connected to the middle portion and is connected to a first gear;

[0018] The camshaft is vertically rotatably connected to the mounting plate, the upper part of which is fixedly connected to the cam, and the second gear is connected thereto, and the second gear is meshed with the first gear.

[0019] When the drive shaft is running forward or reversed, the motion and power are transmitted to the camshaft through the meshing of the first gear and the second gear, and the camshaft drives the cam to run forward or reverse.

[0020] In a specific implementation, the first gear and the second gear are located below the mounting plate and above the bracket. The purpose is to make a reasonable layout to prevent the first gear and the second gear from interfering with the mounting plate or the travel switch. The driving mechanism includes a motor, a driving rod connected to the motor, a sleeve slidingly matched with the driving rod, and a driving disk connected to the sleeve and driven by the sleeve to rotate forward and reversely, and the driving disk drives the driving shaft forward and reversely through the gear assembly. Specifically, the driving rod is a lead screw, the lower part of the sleeve slidingly matches with the driving rod through a threaded pair, and the upper part is connected to the driving disk and drives it to reciprocate. The travel switch is electrically connected to the closing microswitch and the opening microswitch, and is connected to the power supply through other electrical components to realize the functions of opening and closing. The relevant electrical parts are prior art, so they will not be introduced in detail here.

[0021] The beneficial effects of the utility model are:

[0022] By setting the first flange and the second flange on the cam at intervals in a clockwise direction, the first travel switch and the second travel switch are delayed pressed, thereby realizing the delayed triggering of the travel switches at different positions, and then realizing the delayed determination of the output of the opening and closing signals, so as to facilitate and accurately judge the triggering status of each travel switch. The safety of equipment operation is improved, and foreign project standards are met, so as to avoid the output error of the opening and closing signals due to the inadequate triggering of the travel switch, which may cause leakage or electric explosion, and lead to equipment failure or safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an embodiment;

[0024] Figure 2 It is a partial enlarged view of the positional relationship between the cam and the travel switch;

[0025] Figure 3 Cam position diagram in open and closed states, where (a) is the open state; (b) is the closed state;

[0026] 1. Chassis; 2. Driving mechanism; 21. Driving bracket; 22. Driving disk; 3. Transmission mechanism; 31. Driving shaft; 32. First gear; 33. Second gear; 34. Camshaft; 4. Mounting plate; 5. Cam; 51. First flange; 52. Second flange; 6. Travel switch; 61. First travel switch; 62. Second travel switch; 63. Third travel switch; 7. Opening micro switch; 8. Closing micro switch. DETAILED DESCRIPTION

[0027] The following will further describe the technical means adopted to achieve the predetermined inventive purpose of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0028] See also Figure 1 and Figure 2 As shown, a signal switching mechanism of a two-position switch includes a chassis 1 and a transmission device, wherein the transmission device is connected to the chassis 1 through a bracket, a mounting plate 4 is provided above the bracket, a cam 5 is rotatably connected to the mounting plate 4, and a travel switch 6 is arranged at intervals on the outer periphery of the cam 5, and the transmission device presses the travel switch 6 by driving the cam 5 to rotate forward and reversely;

[0029] The travel switch 6 includes a first travel switch 61, a second travel switch 62 and a third travel switch 63 arranged clockwise;

[0030] A first flange 51 and a second flange 52 are arranged on the outer edge of the cam 5 in a clockwise manner;

[0031] The spacing distance between the first flange 51 and the second flange 52 and the spacing distance between the first travel switch 61 and the second travel switch 62 are set to:

[0032] In the open position, the first flange 51 is located between the first travel switch 61 and the second travel switch 62, so that they are in an open state, and the second flange 52 presses the third travel switch 63 to close;

[0033] When in the closing position, the first flange 51 first presses the first travel switch 61 to close, and then the second flange 52 presses the second travel switch 62 to close, and releases the third travel switch 63 to open.

[0034] See also Figure 2 and Figure 3 As shown in the specific working principle, in the initial position, the cam 5 is in the open state, see Figure 3 (a), that is, the first flange is located between the first and second travel switches 62, the rollers of the first travel switch 61 and the second travel switch 62 are in the released state, disconnected from the circuit, and the three-travel switch 6 is in the pressed state; when the cam 5 rotates 90° counterclockwise under the drive of the transmission device, the cam 5 is in the closed state, see Figure 3(b) At this time, the first flange first presses the first travel switch 61, and after a certain interval, as the cam 5 rotates, the front end of the second flange begins to press the second travel switch 62, and then when it continues to rotate to 90°, the rear end of the second flange releases the roller of the third travel switch 63, and the front end continues to press the second travel switch 62. At the same time, the first flange maintains the pressing state with the first travel switch 61, thereby realizing the function of delaying the triggering of the second travel switch 61 and the first travel switch 61, and finally closing the switch. After that, the cam 5 reverses 90° and returns to the initial position, the first travel switch 61 and the second travel switch 62 are in the released state, and the third travel switch 63 is in the pressed trigger state.

[0035] See also Figure 2 As shown, in a specific embodiment, the spacing L1 between the rollers of the first travel switch 61 and the second travel switch 62 is greater than the arc length of the first flange, and less than the arc length L2 between the starting edges of the first flange and the second flange.

[0036] Specifically, the travel switches 6 are arranged at equal intervals, that is, L1=L3, and the central angle between L1 and L3 is 90°-110°. The angle of the cam 5 for forward or reverse rotation is 90°. The central angle of the second flange is 120°, and its starting edge is horizontal, and the extension line passes through the center of the cam 5. The central angle of the first flange is 40°-50°. The specific values ​​of the spacings L1 and L3 between the first travel switch 6, the second travel switch 62 and the third travel switch 63 are calculated based on the radius of the cam 5 and the width of the first flange and the second flange, and are not described in detail here.

[0037] See also Figure 1 As shown, in a specific embodiment, the transmission device includes a driving mechanism 2 and a transmission mechanism 3 connected to the bracket, the driving mechanism 2 is used to provide power, and the transmission mechanism 3 is used to drive the cam 5 to rotate. The transmission mechanism 3 includes:

[0038] A driving shaft 31 is vertically rotatably connected to the middle, and a first gear 32 is connected to the driving shaft 31;

[0039] The camshaft 34 is vertically rotatably connected to the mounting plate 4 , and the upper part thereof is fixedly connected to the cam 5 , to which the second gear 33 is connected, and the second gear 33 is meshed with the first gear 32 .

[0040] When the driving shaft 31 is running forward or reversed, the motion and power are transmitted to the camshaft 34 through the meshing of the first gear 32 and the second gear 33, and the camshaft 34 drives the cam 5 to run forward or reverse.

[0041] Specifically, the first gear 32 and the second gear 33 are located below the mounting plate 4 and above the bracket. The purpose is to reasonably arrange and prevent the first gear 32 and the second gear 33 from interfering with the mounting plate 4 or the travel switch 6.

[0042] In a specific embodiment, the driving mechanism 2 includes a motor, a driving rod connected to the motor, a sleeve slidingly matched with the driving rod, and a driving disk 22 connected to the sleeve and driven by the sleeve to rotate forward and reversely. The driving disk 22 drives the driving shaft 31 forward and reversely through a gear assembly. Specifically, the driving rod is a lead screw, the lower part of the sleeve slidingly matches the driving rod through a threaded pair, and the upper part is connected to the driving disk 22 and drives it to reciprocate. The travel switch 6 is electrically connected to the closing microswitch 8 and the opening microswitch 7, and is connected to the power supply through other electrical components to realize the opening and closing functions. The relevant electrical parts are prior art, so they are not introduced in detail here.

[0043] The above is a preferred embodiment of the present invention, but the present invention is not limited to the above embodiments and examples. Various changes, equivalent substitutions, improvements, etc. made within the knowledge scope of those skilled in the art without departing from the concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A signal switching mechanism for a two-position switch, comprising a chassis (1), a transmission device connected to the chassis via a bracket, a mounting plate (4) provided above the bracket, a cam (5) rotatably connected to the mounting plate, travel switches (6) provided at intervals on the outer periphery of the cam, the transmission device driving the cam to rotate forward and reverse to press the travel switch; characterized in that: The travel switch comprises a first travel switch (61), a second travel switch (62) and a third travel switch (63) which are arranged clockwise; A first flange (51) and a second flange (52) are arranged on the outer edge of the cam (5) in a clockwise manner; The spacing distance between the first flange (51) and the second flange (52) and the spacing distance between the first travel switch (61) and the second travel switch (62) are set as: When in the open position, the first flange (51) is located between the first travel switch (61) and the second travel switch (62), so that they are in an open state, and the second flange (52) presses the third travel switch (63) to close; When in the closing position, the first flange (51) first presses the first travel switch (61) to close, and then the second flange (52) presses the second travel switch (62) to close, and then releases the third travel switch (63) to open.

2. The signal switching mechanism according to claim 1, characterized in that: The spacing L1 between the rollers of the first travel switch (61) and the second travel switch (62) is greater than the arc length of the first flange (51) and less than the arc length L2 between the first flange (51) and the starting edge of the second flange (52).

3. The signal switching mechanism according to claim 2, characterized in that: The travel switches (6) are arranged at equal intervals, that is, L1 = L3, and the central angle between L1 and L3 is 90°-110°.

4. The signal switching mechanism according to claim 2 or 3, characterized in that: The angle of the cam (5) for forward or reverse rotation is 90°.

5. The signal switching mechanism according to claim 4, characterized in that: The central angle of the second flange (52) is 120°, and its starting edge is horizontal, and its extension line passes through the center of the cam (5).

6. The signal switching mechanism according to claim 5, characterized in that: The central angle of the first flange (51) is 40°-50°.

7. The signal switching mechanism according to claim 1, characterized in that: The transmission device comprises a driving mechanism (2) and a transmission mechanism (3) connected to a bracket, wherein the driving mechanism (2) is used to provide power, and the transmission mechanism (3) is used to drive the cam (5) to rotate, and the transmission mechanism (3) comprises: A driving shaft (31) is vertically rotatably connected thereto, and a first gear (32) is connected thereto; The camshaft (34) is vertically rotatably connected to the mounting plate (4), and the upper part thereof is fixedly connected to the cam (5), and the second gear (33) is connected thereto, and the second gear is meshed with the first gear (32).

8. The signal switching mechanism according to claim 7, characterized in that: The driving mechanism (2) comprises a motor, a driving rod connected to the motor, a sliding sleeve slidably matched with the driving rod, and a driving disk (22) connected to the sliding sleeve and driven by the sliding sleeve to rotate forward and reversely. The driving disk (22) drives the driving shaft (31) to rotate forward and reversely through a gear assembly.

9. The signal switching mechanism according to claim 8, characterized in that: The driving rod is a lead screw, the lower part of the sliding sleeve is slidably matched with the driving rod through a threaded pair, and the upper part is connected to the driving disk (22) and drives it to reciprocate.

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