Cam operating mechanism and automatic transfer switch

Abstract

The present invention discloses a cam operating mechanism and an automatic transfer switch, which include: a housing composed of a first housing and a second housing, with a space formed between the two; a rotating cam that can be reciprocated and placed in the space of the housing, the rotating cam having a hollow interlayer, a first channel provided perpendicular to the interlayer on one side of the rotating cam, a shaft provided through the interlayer at one end of the rotating cam, and both ends of the shaft forming a sliding fit with a first curved groove; a camshaft that is installed in the interlayer of the rotating cam via the first channel and can be reciprocated relative to the housing, a linkage shaft provided at one end of the camshaft, and both ends of the linkage shaft forming a sliding fit with a second curved groove; and an elastic member provided in the interlayer of the rotating cam. The rotating cam is configured to have an interlayer structure, and the camshaft is fixedly provided in the interlayer, so that the elastic member used to connect the two is confined in the interlayer, which can ensure the reliability of the elastic member's fixation and prevent it from falling off, while improving synchronization.

Description

Technical Field

[0001] The present invention particularly relates to a cam operating mechanism and an automatic transfer switch. Background Art

[0002] Currently, most ATSE operating mechanisms utilize double tension springs. The forces acting on the mechanical movement can create resistance on the friction surface, leading to asynchronous movement at both ends. This can cause the mechanism to slow down or even fail, severely impacting its speed. Furthermore, most utilize rotating brackets. Due to surface contact, the materials used are mostly thermoplastic, which can cause fuzzing after friction. Lubricants are often required to maintain smooth rotation, but lubricants rely on uniform application by workers and are affected by climate and environmental factors. This can lead to mechanism jamming or clogging after a short period of use, shortening the lifespan of the operating mechanism and even damaging the motor.

[0003] For example, Chinese patent CN 109509647 A discloses an operating mechanism and a switch device thereof, which utilizes a first driving member and a second operating rod passing through a housing and connected to the driving mechanism via two tension springs. The second operating rod is also arranged through the housing, that is, the first driving member and the second operating rod are fixed by two tension springs. However, its reliability depends on the housing. Deformation of the housing may cause conversion failure. At the same time, drying up of the housing grease or the influence of climatic factors may cause jamming. At the same time, since the first driving rod and the second operating rod are both arranged through the housing, there is no left and right fixation, and they are fixed closely to the tension springs, which may cause the tension springs to fall off, resulting in conversion failure. In addition, the use of two tension springs may cause the two tension springs to be out of sync after wear, thereby causing separation or energy storage failure. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a cam operating mechanism and an automatic transfer switch.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A cam operating mechanism comprising:

[0007] The housing is composed of a first housing and a second housing, with a space formed therebetween, and a first curved groove and a second curved groove are symmetrically provided on opposite sides of the first housing and the second housing;

[0008] A rotating cam is reciprocatingly rotatable and disposed within the space of the housing. The rotating cam is provided with a hollow interlayer. A first channel is provided on one side of the rotating cam and is perpendicular to the interlayer. An axis is provided at one end of the rotating cam and passes through the interlayer. Both ends of the axis respectively form a sliding fit with the first curved groove.

[0009] A camshaft is installed in the interlayer of the rotating cam via the first channel and can reciprocate relative to the housing. A linkage shaft is provided at one end of the camshaft, and both ends of the linkage shaft form a sliding fit with the second curved groove;

[0010] An elastic member is arranged in the interlayer of the rotating cam, one end of which is connected to the shaft and the other end of which is connected to the linkage shaft. The elastic member accumulates energy during the rotation of the rotating cam and releases the energy when the rotating cam rotates to the release position to drive the camshaft to move quickly.

[0011] The rotating cam includes a first clamping plate and a second clamping plate. The first clamping plate is partially connected to the second clamping plate to form an interlayer therebetween for accommodating the cam shaft. A first channel communicating with the interlayer is provided on the first clamping plate.

[0012] The first channel is composed of a non-full circle portion for placing the cam shaft and an arc portion for limiting the moving path of the linkage shaft.

[0013] The shaft and the rotating cam are integrally formed, and limiting pieces for limiting the elastic piece are provided at both ends of the shaft located in the interlayer.

[0014] The camshaft comprises:

[0015] The rotating part is rotatably arranged in the interlayer of the rotating cam;

[0016] The rotating arm is connected to the rotating part and is composed of two layers. A waist-shaped hole is provided on the rotating arm for the linkage shaft to pass through, and a clamping space for limiting the elastic member is formed between the two layers.

[0017] One end of the camshaft extends to form an indicator, and a rotating shaft of the indicator is coaxially arranged with a rotating portion of the camshaft.

[0018] A fire protection feedback switch is provided on one side of the second shell, and a groove adapted to the fire protection feedback switch is correspondingly provided on the rotating shaft of the indicator.

[0019] The first shell and the second shell are provided with a third curved groove at the upper ends of the first curved groove and the second curved groove, and balls are provided on both sides of the rotating cam for sliding fit with the third curved groove.

[0020] A circuit board is provided on the outside of the first shell, and a plurality of Hall sensors for position indication are provided on the circuit board. Corresponding positioning holes are provided on the first shell, and the positioning holes are arranged corresponding to the Hall sensors. The rotating cam is located above the shaft and is provided with a magnet mounting groove, and a magnet is provided in the magnet mounting groove.

[0021] An automatic transfer switch using the cam operating mechanism comprises the cam operating mechanism. A driving mechanism is provided on the outer side of the cam operating mechanism and is linked to the rotating cam.

[0022] The beneficial effects of the present invention are as follows: the rotating cam is set to have a sandwich structure, and the camshaft is fixedly set in the sandwich, so that the elastic part used to connect the two is confined in the sandwich, which can ensure the fixing reliability of the elastic part and make it not easy to fall off. At the same time, the synchronization is improved, and the sliding fit between the shaft and the housing is utilized to improve the movement reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0025] Figure 3 This is a schematic diagram of one side of the present invention (without the driving mechanism).

[0026] Figure 4 This is a schematic diagram of the other side of the present invention (without the driving mechanism).

[0027] Figure 5 It is a schematic diagram of the cooperation between the rotating cam and the camshaft of the present invention.

[0028] Figure 6 It is a structural schematic diagram of the second shell of the present invention.

[0029] Figure 7 It is a structural schematic diagram of the first shell of the present invention.

[0030] Figure 8 It is a structural schematic diagram of the camshaft of the present invention.

[0031] Figure 9 It is a structural schematic diagram of the rotating cam of the present invention.

[0032] Figure 10 It is a side view of the rotating cam of the present invention.

[0033] Figure 11 It is a side view of the other side of the rotating cam of the present invention.

[0034] Figure 12 Schematic diagram of the explosion of the camshaft of the present invention. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] As shown in the figure, a cam operating mechanism includes:

[0040] The housing 1 is composed of a first housing 5 and a second housing 6, with a space formed therebetween. A first curved groove and a second curved groove are symmetrically provided on opposite sides of the first housing and the second housing. The first housing is provided with a through hole for the driving shaft of the driving mechanism to pass through. The first curved groove 52 and the second curved groove are both distributed with the through hole as the center of a circle. The second curved groove 51 includes an arc groove and a plurality of limiting grooves 53 connected to the arc groove. There are three limiting grooves, which are respectively located at both ends and in the middle of the arc groove. When the linkage shaft is located in the left and right limiting grooves, the contact mechanism is in the connected state, and the moving contact is in contact and connected with the common static contact or the spare static contact. When the linkage shaft is located in the middle limiting groove, the contact mechanism is in the disconnected state, and the moving contact is not in contact and connected with the common static contact or the spare static contact. The number of limiting grooves can be selected according to needs, and the shape of the limiting groove can be semicircular or U-shaped, which can be set according to needs.

[0041] A rotating cam 2 is disposed within the housing and is rotatable. The rotating cam has a hollow interlayer. A first channel 23 is provided on one side of the rotating cam and is perpendicular to the interlayer. A shaft is provided at one end of the rotating cam and passes through the interlayer. Both ends of the shaft form a sliding fit with the first curved groove.

[0042] The rotating cam includes a first clamping plate 24 and a second clamping plate 25. The first clamping plate is partially connected to the second clamping plate, and a sandwich 26 for accommodating the cam shaft is formed therebetween. A first channel connecting the sandwich is provided on the first clamping plate.

[0043] The thickness of the rotating cam is consistent with the width of the interior space of the housing, ensuring that after the rotating cam is placed in the housing, its two surfaces are in contact with the housing, and the thickness of the internal interlayer is adapted to the thickness of the camshaft. This ensures that after the camshaft is installed in the rotating cam, it can rotate relative to the rotating cam. The first clamping plate of the rotating cam is provided with a positioning shaft, and the camshaft cooperates with the positioning shaft to rotate relative to the positioning shaft. The center of the positioning shaft is provided with a hole that is linked to the drive shaft, so that it can be driven by the drive mechanism.

[0044] The first channel is composed of a non-circular portion 231 for placing the camshaft and an arc portion 232 for limiting the moving path of the linkage shaft, wherein the camshaft can be placed in the interlayer of the rotating cam through the first channel. In addition, the non-circular portion is a circular structure, and its lower side is connected to the arc portion to form an incomplete circle. The rotating part of the camshaft is placed in the non-circular portion, and the rotating arm connected to the rotating part is placed in the arc portion. The linkage shaft linked to the rotating arm moves back and forth along the arc portion with the rotating part as the center of the circle.

[0045] At one end of the rotating cam, that is, the protruding end, there are convex points 21 on both sides. After the cam is installed in the housing, the convex points are embedded in the first curved groove and can slide along the first curved groove. The two convex points are connected to form an axis for hanging the elastic member. In order to ensure that the elastic member does not move left and right, limit members 22 are set at both ends of the axis. The gap between the two limit members is used to limit the elastic member to prevent it from shaking left and right.

[0046] The shaft is integrally formed with the rotating cam, and can also support the two clamping plates, so that the rotating cam is not easily deformed.

[0047] A camshaft 7 is mounted in the interlayer of the rotating cam via a first channel 23 and is reciprocatable relative to the housing. A linkage shaft 14 is provided at one end of the camshaft. Both ends of the linkage shaft form a sliding fit with the second curved groove. The camshaft is used to drive the switching action of the contact mechanism. The contact mechanism includes a normal static contact, a spare static contact, and a movable contact that switches between the normal static contact and the spare static contact.

[0048] The camshaft 7 includes:

[0049] The rotating portion 76 is rotatably disposed in the interlayer of the rotating cam. The rotating portion is provided with a positioning groove adapted to the positioning shaft. The rotating portion can rotate relative to the rotating cam.

[0050] The rotating arm 73 is connected to the rotating part and is composed of two layers. A waist-shaped hole 74 is provided on the rotating arm for the linkage shaft to pass through, and a clamping space 75 for restricting the elastic member is formed between the two layers.

[0051] One end of the camshaft extends to form an indicator member 72. The rotating shaft of the indicator member is coaxially arranged with the rotating part of the camshaft. The camshaft and the indicator member are integrally formed, which reduces the installation steps and prevents the indicator member from being broken due to inertia during separation and combination.

[0052] The camshaft and the indicator may be separate structures, wherein the indicator comprises a rotating shaft having a through hole, and the rotating portion of the camshaft extends and is inserted into the through hole and forms a whole therewith. In order to ensure that the rotating portion can drive the indicator to rotate, the through hole is arranged into a non-circular structure, and a groove adapted to the fire feedback switch 9 is provided at the lower end of the rotating shaft for triggering the fire feedback switch.

[0053] The elastic member 8 is a tension spring, which is arranged in the interlayer of the rotating cam. One end of the elastic member is connected to the shaft, and the other end is connected to the linkage shaft. The elastic member accumulates energy during the rotation of the rotating cam, and releases energy when the rotating cam rotates to the release position to drive the camshaft to move quickly.

[0054] Energy is stored by fixing the elastic part in the center. When the rotation passes the dead point, the trigger is triggered, and the mechanism moves instantly, accelerating the movement. The left and right limiters are used to prevent the tension spring from falling off.

[0055] A fire alarm feedback switch 9 is installed on one side of the second housing. A corresponding groove 71 is provided on the rotating shaft of the indicator. A semicircular camshaft is provided to micro-touch the switch, achieving interlocking of the fire alarm linkage, preventing false feedback of fire alarm activation. Compared with the previous method of using relays to output fire alarm linkage signals, this method has a higher reliability of signal interlocking.

[0056] The first shell and the second shell are provided with a third curved groove 54 at the upper end of the first curved groove and the second curved groove, and balls 13 for sliding fit in the third curved groove are provided on both sides of the rotating cam. In order to make the rotation smooth and reduce resistance, a third curved groove is provided in the shell, and balls are provided on both sides of the rotating cam so that the balls are adapted to the third curved groove, thereby making the switching smoother. The balls move along the third curved groove through the cooperation with the first shell and the second shell, effectively reducing friction.

[0057] A circuit board 12 is provided on the outside of the first shell, and a plurality of Hall sensors for position indication are provided on the circuit board. A corresponding positioning hole 55 is provided on the first shell, and the positioning hole is arranged corresponding to the Hall sensor. The rotating cam is located above the shaft and is provided with a magnet mounting groove, and a magnet is provided in the magnet mounting groove. The rotation path of the magnet is adapted to the arc formed by the plurality of Hall sensors, and when the magnet moves to the positioning hole, it is sensed by the corresponding Hall sensor.

[0058] The mechanical micro-control separation and connection is replaced with Hall lossless sensing devices to increase service life.

[0059] Two micro switches 11 are provided on the circuit board. The driving rod of the driving mechanism is linked with a cam control member 10. When the cam control member is in motion, the two micro switches are triggered by controlling the rotation of the cam control member, thereby outputting different signals.

[0060] During assembly, the camshaft needs to be inserted into the rotating cam through the first channel first, and then the linkage shaft is inserted into the waist-shaped hole of the rotating arm of the camshaft, and one end of the elastic member is hung on the linkage shaft and the other end is hung on the shaft of the rotating cam, thereby completing the assembly of the rotating cam assembly. The rotating cam assembly is then placed on the inside of the second shell, and the ball is embedded in the mounting groove of the rotating cam during assembly, and then another ball and magnet are placed on the other side, and then the first shell is covered to complete the assembly. Subsequently, other parts are assembled on both sides of the shell.

[0061] An automatic transfer switch using the cam operating mechanism comprises the cam operating mechanism. A driving mechanism is provided on the outer side of the cam operating mechanism and is linked to a rotating cam.

[0062] One side of the shell is fixedly connected to the mounting bracket 4, and the mounting bracket 4 is provided with a motor 3. The driving rod of the motor is linked to the rotating cam of the cam operating mechanism. A circuit board is provided between the mounting bracket and the shell. The circuit board is provided with a semicircular notch with the driving rod as the center, and two micro switches are provided on both sides of the semicircular notch. A cam control part is provided on the driving rod, which rotates as the driving rod rotates, thereby triggering the two micro switches respectively. An indicator part is provided on the other side of the shell, which is connected to the camshaft. At the same time, a fire feedback switch is provided on the shell, and the switch of the fire feedback switch is adapted to the semicircular groove on the indicator part.

[0063] The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A cam operating mechanism, characterized in that: It includes: The housing is composed of a first housing and a second housing, with a space formed therebetween, and a first curved groove and a second curved groove are symmetrically provided on opposite sides of the first housing and the second housing; A rotating cam is reciprocatingly rotatable and disposed within the space of the housing. The rotating cam is provided with a hollow interlayer. A first channel is provided on one side of the rotating cam and is perpendicular to the interlayer. An axis is provided at one end of the rotating cam and passes through the interlayer. Both ends of the axis respectively form a sliding fit with the first curved groove. A camshaft is installed in the interlayer of the rotating cam via the first channel and can reciprocate relative to the housing. A linkage shaft is provided at one end of the camshaft, and both ends of the linkage shaft form a sliding fit with the second curved groove; An elastic member is arranged in the interlayer of the rotating cam, one end of which is connected to the shaft and the other end of which is connected to the linkage shaft. The elastic member accumulates energy during the rotation of the rotating cam and releases the energy when the rotating cam rotates to the release position to drive the camshaft to move quickly.

2. The cam operating mechanism according to claim 1, characterized in that: The rotating cam includes a first clamping plate and a second clamping plate. The first clamping plate is partially connected to the second clamping plate to form an interlayer therebetween for accommodating the cam shaft. A first channel communicating with the interlayer is provided on the first clamping plate.

3. A cam operating mechanism according to claim 1 or 2, characterized in that: The first channel is composed of a non-full circle portion for placing the cam shaft and an arc portion for limiting the moving path of the linkage shaft.

4. A cam operating mechanism according to claim 1 or 2, characterized in that: The shaft and the rotating cam are integrally formed, and limiting pieces for limiting the elastic piece are provided at both ends of the shaft located in the interlayer.

5. The cam operating mechanism according to claim 1, characterized in that: The camshaft comprises: The rotating part is rotatably arranged in the interlayer of the rotating cam; The rotating arm is connected to the rotating part and has two layers. A waist-shaped hole for the linkage shaft to pass through is provided on the rotating arm, and a clamping space for limiting the elastic member is formed between the two layers.

6. The cam operating mechanism according to claim 5, characterized in that: One end of the camshaft extends to form an indicator, and a rotating shaft of the indicator is coaxially arranged with a rotating portion of the camshaft.

7. The cam operating mechanism according to claim 6, characterized in that: A fire protection feedback switch is provided on one side of the second shell, and a groove adapted to the fire protection feedback switch is correspondingly provided on the rotating shaft of the indicator.

8. The cam operating mechanism according to claim 1, characterized in that: The first shell and the second shell are provided with a third curved groove at the upper ends of the first curved groove and the second curved groove, and balls are provided on both sides of the rotating cam for sliding fit with the third curved groove.

9. The cam operating mechanism according to claim 1, characterized in that: A circuit board is provided on the outside of the first shell, and a plurality of Hall sensors for position indication are provided on the circuit board. Corresponding positioning holes are provided on the first shell, and the positioning holes are arranged corresponding to the Hall sensors. The rotating cam is located above the shaft and is provided with a magnet mounting groove, and a magnet is provided in the magnet mounting groove.

10. An automatic transfer switch using the cam operating mechanism according to any one of claims 1 to 9, characterized in that: It comprises the above-mentioned cam operating mechanism, and a driving mechanism is provided on the outer side of the cam operating mechanism and is linked with the rotating cam.

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