A selector contact limiting mechanism and a multi-position positive and negative adjustable tap changer

Abstract

The present invention provides a selector contact limiting mechanism. The selector contact limiting mechanism includes a transmission shaft, an upper sheave, a limiting dial groove member, a limiting rod, and a limiting pin. One end of the limiting dial groove member is rotatably installed on the transmission shaft, and the other end points to the upper sheave. One end of the limiting rod is fixed on the limiting dial groove member, and an acute angle is formed between the other end and the limiting dial groove member. The limiting rod can be driven by the limiting dial groove member to approach or move away from the upper sheave. A first groove is provided at the other end of the limiting dial groove member. A limiting groove is provided on the side of the limiting dial groove member away from the limiting rod. The limiting pin is fixed on the upper sheave and corresponds to the positions of the first groove and the limiting groove. The present invention also provides a multi-position forward and reverse adjustable tap selector including the above selector contact limiting mechanism. The present invention can effectively limit the tap selector contacts, prevent the tap selector contacts from exceeding the gear positions, and at the same time can meet the user's requirements for the gear positions, improving the transmission accuracy of the polarity conversion contacts.

Description

Technical Field

[0001] The present invention belongs to the technical field of on-load tap changers for transformers, and particularly relates to a selector contact limiting mechanism and a multi-step forward and reverse adjustable tap selector. This limiting structure is used to limit the maximum or minimum positions of the selector contacts of the forward and reverse adjustable on-load tap changer. Background Art

[0002] Normally, a set of on-load tap changers (including the on-load tap changer body and the electric operating mechanism) has three sets of limiting devices to ensure the reliable and safe operation of the on-load tap changer. They are respectively: the electrical limit and the mechanical limit device of the electric mechanism, and the mechanical limit device of the on-load tap changer. The mechanical limit device of the combined on-load tap changer is usually arranged in the grooved wheel mechanism of the contact selector.

[0003] The multi-step forward and reverse adjustable on-load tap changer belongs to the combined on-load tap changer. In the existing multi-step forward and reverse adjustable on-load tap changer selector contacts, there is no limiting structure provided on the switch selector contacts, and the limit can only be achieved by relying on the electric mechanism box connected to its transmission rod. If the tap selector contact exceeds the position, the step voltage of its action becomes the full voltage of the voltage regulating winding, greatly exceeding the design capacity of the switching switch and making it impossible to extinguish the arc, resulting in a major accident of burning out the switching switch. The situation where the tap selector contact exceeds the position is mainly caused by the following reasons:

[0004] (1) The connection between the electric mechanism and the tap changer is misaligned;

[0005] (2) The tap changer position indication is misaligned;

[0006] (3) The number of turns of the electric mechanism in both forward and reverse directions from start to switching is asymmetric;

[0007] (4) The contact selector is deformed or severely distorted under force.

[0008] In addition, the existing multi-step forward and reverse adjustable on-load tap changer also has many problems, such as fewer contacts distributed circumferentially on the selector contacts, low utilization rate of the circumferential space, insufficient positions, the use of a grooved wheel structure for the polarity conversion contacts, and poor transmission accuracy. Summary of the Invention

[0009] To solve the above problems, the purpose of the present invention is to provide a selector contact limiting mechanism and a multi-step forward and reverse adjustable tap selector that can effectively limit the contacts of the contact selector, prevent the contacts of the contact selector from exceeding the position, and at the same time can meet the user's requirements for positions and improve the transmission accuracy of the polarity conversion contacts.

[0010] The purpose of the present invention is achieved through the following technical solutions:

[0011] A selector contact limiting mechanism comprises a transmission shaft, an upper sheave, and a limiting device, the limiting device comprising a limiting notch, a limiting rod, and a limiting pin. One end of the limiting notch is rotatably mounted on the transmission shaft, with the other end pointing toward the upper sheave. One end of the limiting rod is fixed to the limiting notch, while the other end extends outward, forming an acute angle with the limiting notch. Driven by the limiting notch, the limiting rod can move toward or away from the upper sheave. A groove 1 is provided on the side of the limiting notch pointing toward the upper sheave. A limiting groove is provided on the side of the limiting notch away from the limiting rod. The limiting pin is fixed to the upper sheave and corresponds to the position of groove 1 and the limiting groove. The limiting pin rotates with the upper sheave and shifts groove 1 to rotate the limiting notch. After the limiting notch is shifted, the limiting pin continues to rotate with the upper sheave until it contacts the other end of the limiting rod or becomes lodged in the limiting groove, preventing the upper sheave from rotating.

[0012] When the upper groove wheel rotates forward, the limit pin pushes the groove 1, causing the limit groove member to rotate a certain angle in the rotation direction of the upper groove wheel. At the same time, the limit groove member drives the other end of the limit rod to approach the upper groove wheel, so that the other end of the limit rod is located on the rotation path of the limit pin. After that, the upper groove wheel continues to rotate forward, and the limit pin will press against the other end of the limit rod, limiting the upper groove wheel, making it difficult for the groove wheel mechanism to continue to rotate.

[0013] When the upper groove wheel rotates in the opposite direction, the limiting pin pushes the groove 1, causing the limiting groove-pushing member to rotate a certain angle in the direction of rotation of the upper groove wheel. The limiting groove-pushing member drives the other end of the limiting rod away from the upper groove wheel, so that the limiting groove is located on the rotation path of the limiting pin. The upper groove wheel continues to rotate in the opposite direction, and the limiting pin will be stuck in the limiting groove, limiting the upper groove wheel, and the groove wheel mechanism will be difficult to continue to rotate.

[0014] Furthermore, one end of the limiting rod is rotatably sleeved outside the transmission shaft and is fixed to the limiting groove member through an elastic pin and a bolt.

[0015] Furthermore, in order to facilitate the movement and locking of the limiting slot member and reduce wear on parts, a roller is rotatably provided on the limiting pin and matches the groove 1 and the limiting slot.

[0016] Furthermore, when the limit slot member drives the other end of the limit rod close to the upper groove wheel, the other end of the limit rod is located on the rotation path of the limit pin; when the limit slot member drives the other end of the limit rod away from the upper groove wheel, the limit slot is located on the rotation path of the limit pin.

[0017] Furthermore, to ensure that the limit pin is stuck in the limit groove, the upper groove wheel is effectively limited, making it difficult for the upper groove wheel (groove wheel mechanism) to continue to rotate; the sum of the rotation radius of the limit pin and the rotation radius of the limit groove is greater than the distance from the center of the transmission shaft to the center of the upper groove wheel.

[0018] A multi-position forward and reverse adjustment tap selector comprises the above-mentioned selector contact limiting mechanism.

[0019] Furthermore, the multi-speed forward and reverse tap selector also includes a hollow support and a contact selector and a polarity converter installed side by side in the support, the selector contact limiting mechanism is installed on the support and connected between the contact selector and the polarity converter; the transmission shaft is rotatably installed on the support.

[0020] Specifically, the contact selector includes a first sleeve, a lower groove wheel, a groove wheel shifting member, a first main shaft, a selected static contact and a selected moving contact; the first sleeve is vertically fixed to the support; the upper groove wheel is rotatably mounted on the first sleeve; the lower groove wheel is rotatably mounted on the first sleeve and is located below the upper groove wheel; the middle of the groove wheel shifting member is fixed on the transmission shaft, and a shifting roller is installed at each end of the groove wheel shifting member, one positive and one negative, and the two ends of the groove wheel shifting member can alternately extend between the upper groove wheel and the lower groove wheel as the groove wheel shifting member rotates, and alternately shift the lower groove wheel and the upper groove wheel; the upper end of the first main shaft is fixedly connected to the first sleeve, and the lower end is fixed to the support. Bottom; the selection static contact is evenly installed on the support through the first insulating rod and is evenly distributed outside the first main shaft in a circular shape, and the selection static contact is provided with multiple upper selection static contacts and multiple lower selection static contacts corresponding to each phase of the power supply; the selection moving contact is rotatably installed on the first main shaft and is located between the first main shaft and the selection static contact; the selection moving contact is provided with an upper selection moving contact and a lower selection moving contact corresponding to each phase of the power supply, the upper selection moving contact of each phase corresponds to the position of the upper selection static contact of the phase and is connected to the upper groove wheel, and the lower selection moving contact of each phase corresponds to the position of the lower selection static contact of the phase and is connected to the lower groove wheel.

[0021] Specifically, the polarity converter includes a second sleeve, a second main shaft, a gear, a transmission gear, a polarity conversion slot member, a slot rod, a polarity conversion static contact and a polarity conversion moving contact; the second sleeve is vertically fixed on the support; the upper end of the second main shaft is fixedly connected to the second sleeve, and the lower end is fixed to the bottom of the support; the gear is rotatably mounted on the second sleeve; one end of the transmission gear is rotatably sleeved outside the transmission shaft, and the other end is meshed with the gear; one end of the polarity conversion slot member is fixedly connected to the transmission gear, and the other end points to the lower groove wheel and points to the lower groove wheel. A second groove is provided on one side of the downward groove wheel; the groove-shifting rod is fixed on the lower groove wheel and can shift the groove of the polarity conversion groove-shifting member in forward and reverse directions under the drive of the lower groove wheel, so that the polarity conversion groove-shifting member rotates forward and reverse; the polarity conversion static contact is installed on the outer periphery of the second main shaft through the second insulating rod, and is divided into a positive polarity conversion static contact and a negative polarity conversion static contact; the polarity conversion moving contact is rotatably installed on the second main shaft and connected to the gear, and the polarity conversion moving contact can alternately contact the positive polarity conversion static contact and the negative polarity conversion static contact after rotating forward and reversely under the drive of the gear.

[0022] Furthermore, one end of the transmission gear is rotatably sleeved outside the transmission shaft and fixed on the polarity conversion slotted part through an elastic pin and a bolt.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention can effectively avoid the contact of the contact selector exceeding the gear position, causing the arc extinction failure of the tap changer and resulting in a major accident of the switching switch being burned out, ensuring the quality of the tap changer. Moreover, the selector contact and the polarity conversion contact in the on-load tap changer are separated and not distributed on the same circumference. More contacts can be distributed on the circumference for the selector contact; the polarity conversion contact adopts a gear transmission mechanism, improving the transmission accuracy of the polarity conversion contact, ensuring the accurate positioning of the polarity conversion contact, meeting the user's requirements for the gear position, and enhancing the market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below with reference to the drawings.

[0026] Figure 1 It is a schematic structural diagram of the contact limiter mechanism of the selector of the present invention;

[0027] Figure 2 It is Figure 1 a cross-sectional view taken along the A-A direction in

[0028] Figure 3 The action flow chart of the present invention when the upper sheave rotates forward;

[0029] Figure 4 The action flow chart of the present invention when the upper sheave rotates reversely;

[0030] Figure 5 It is a schematic structural diagram of the multi-gear positive and negative adjustable tap selector of the present invention;

[0031] Figure 6 It is Figure 5 a cross-sectional view taken along the B-B direction in

[0032] Figure 7 It is Figure 5 a cross-sectional view taken along the C-C direction in

[0033] Figure 8 It is Figure 5 a schematic structural diagram of the upper part in

[0034] Figure 9 It is Figure 8 a cross-sectional view taken along the D-D direction in

[0035] Figure 10 It is a connection relationship diagram of the transmission gear and the polarity conversion slotted part;

[0036] Figure 11 is Figure 10 a cross-sectional view in the E-E direction in the figure;

[0037] As shown in the figure: 1 - support, 2 - upper sheave, 3 - transmission bearing, 4 - limit dial groove part, 5 - first groove, 6 - limit groove, 7 - limit rod, 8 - limit pin, 9 - first sleeve, 10 - lower sheave, 11 - sheave dial groove part, 12 - dial groove roller, 13 - first main shaft, 14 - selection static contact, 141 - upper layer selection static contact, 142 - lower layer selection static contact, 15 - first insulating rod, 16 - selection moving contact, 161 - upper layer selection moving contact, 162 - lower layer selection moving contact, 17 - first connecting rod, 18 - second connecting rod, 19 - second sleeve, 20 - gear, 21 - transmission gear, 22 - polarity conversion dial groove part, 23 - dial groove rod, 24 - second main shaft, 25 - polarity conversion static contact, 251 - positive polarity conversion static contact, 252 - negative polarity conversion static contact, 26 - second insulating rod, 27 - polarity conversion moving contact, 28 - third connecting rod, 29 - second groove. Specific embodiments

[0038] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. Example 1

[0041] like Figure 1 and Figure 2 As shown, this embodiment provides a selector contact limit mechanism, which is used to limit the selection contacts of a multi-speed forward and reverse tap selector. It is a mechanical limit device that can prevent the contact selector contacts from exceeding the gear position, causing the tap changer to fail to extinguish the arc, resulting in a serious accident such as burning of the transfer switch, thereby ensuring the quality of the tap changer.

[0042] The selector contact limiting mechanism comprises an upper groove wheel 2 and a transmission shaft 3 which are respectively rotatably arranged in the multi-speed forward and reverse adjustment tap selector, and a limiting device.

[0043] like Figure 1 As shown, the limiting device includes a limiting groove member 4, a limiting rod 7 and a limiting pin 8.

[0044] One end of the position-limiting and shifting slot member 4 is rotatably mounted on the transmission shaft 3 (rotatably connected thereto via a bearing or sleeve), with the other end pointing toward the upper sheave 2. A groove 1 5 is provided on the side of the position-limiting and shifting slot member 4 that points toward the upper sheave. A limiting groove 6 is provided on the side of the position-limiting and shifting slot member 4 that is away from the limiting rod 7.

[0045] One end of the limit rod 7 is rotatably sleeved on the outside of the transmission shaft 3 and fixed to the limit groove member 4 through an elastic pin and a bolt, and the other end of the limit rod 7 extends outward and forms an acute angle with the limit groove member 4. The limit rod 7 can approach or move away from the upper groove wheel 2 under the drive of the limit groove member 4.

[0046] The limiting pin 8 is fixed to the upper sheave 2 and corresponds to the position of the groove 1 5 and the limiting slot 6. The limiting pin 8 rotates with the upper sheave 2 and rotates the limiting slot-moving member 4 by moving the groove 1 5. After the limiting slot-moving member 4 is rotated, the limiting pin 8 continues to rotate with the upper sheave 2 until it contacts the other end of the limiting rod 7 or becomes lodged in the limiting slot 6, making it difficult for the upper sheave 2 to rotate. To facilitate the movement and locking of the limiting slot-moving member 4 and reduce component wear, the limiting pin 8 is rotatably provided with a roller that matches the groove 1 5 and the limiting slot 6.

[0047] When the limit slot member 4 drives the other end of the limit rod 7 close to the upper groove wheel 2, the other end of the limit rod 7 is located on the rotation path of the limit pin 8; when the limit slot member 4 drives the other end of the limit rod 7 away from the upper groove wheel 2, the limit slot 6 is located on the rotation path of the limit pin 8.

[0048] In order to increase the contact area between the other end of the limiting rod 7 and the limiting nail 8 and ensure the stability of the limit, the other end of the limiting rod 7 can be thickened, and a groove matching the limiting nail 8 can also be provided on the other end of the limiting rod 7.

[0049] To ensure that after the limit pin 8 is stuck in the limit groove 6, the upper groove wheel 2 is effectively limited, so that the upper groove wheel 2 (groove wheel mechanism) is difficult to continue to rotate; the sum of the rotation radius of the limit pin 8 and the rotation radius of the limit groove 6 is greater than the distance from the center of the transmission shaft 3 to the center of the upper groove wheel 2.

[0050] like Figure 3 As shown, when the upper groove wheel 2 rotates forward (clockwise), the limiting pin 8 moves the groove 1 5, causing the limiting groove member 4 to rotate a certain angle in the rotation direction of the upper groove wheel 2. At the same time, the limiting groove member 4 drives the other end of the limiting rod 7 to approach the upper groove wheel 2, so that the other end of the limiting rod 7 is located on the rotation path of the limiting pin 8. After that, after the upper groove wheel 2 continues to rotate forward for a certain angle, the limiting pin 8 will press against the other end of the limiting rod 7, limiting the upper groove wheel 2, and the groove wheel mechanism will be difficult to continue to rotate.

[0051] like Figure 4 As shown, when the upper groove wheel 2 rotates in the opposite direction (counterclockwise), the limiting pin 8 moves the groove 1 5, causing the limiting groove member 4 to rotate a certain angle in the rotation direction of the upper groove wheel 2, and the limiting groove member 4 drives the other end of the limiting rod 7 away from the upper groove wheel 2, so that the limiting groove 6 is located on the rotation path of the limiting pin 8. After that, the upper groove wheel 2 continues to rotate in the opposite direction for a certain angle, and the limiting pin 8 will be stuck in the limiting groove 6, limiting the upper groove wheel 2, and the groove wheel mechanism will be difficult to continue to rotate. Example 2

[0052] like Figures 5 - 9 As shown, this embodiment provides a multi-position forward / reverse tap selector, comprising a hollow support 1, the selector contact limiting mechanism described in Example 1, and a contact selector and a polarity converter mounted side by side within the support. The selector contact limiting mechanism is mounted on the support 1 and connected between the contact selector and the polarity converter. The transmission shaft 3 is rotatably mounted on the support 1 via a rolling bearing and a retaining ring. The transmission shaft 3 can rotate under the drive of either an electric mechanism or a manual mechanism.

[0053] The contact selector includes a first sleeve 9, a lower groove wheel 10, a groove wheel shifting member 11, a first main shaft 13, a selection static contact 14 and a selection moving contact 16; the first sleeve 9 is vertically fixed to the support 1 by bolts; the upper groove wheel 2 is rotatably mounted outside the first sleeve 9; the lower groove wheel 10 is rotatably mounted outside the first sleeve and is located below the upper groove wheel 2; the middle part of the groove wheel shifting member 11 is fixed to the transmission shaft 3 (can rotate synchronously with the transmission shaft 3), and a shifting roller 12 is installed at each end of the groove wheel shifting member 11, one positive and one negative (such as Figure 6 and Figure 9 As shown), the two ends of the groove wheel shifting member 11 can alternately extend between the upper groove wheel 2 and the lower groove wheel 10 as the groove wheel shifting member 11 rotates and alternately shift the upper groove wheel 2 and the lower groove wheel 10, so that the upper groove wheel 2 and the lower groove wheel 10 alternately move once every 180 degrees; the upper end of the first main shaft 13 is coaxially fixedly connected to the first sleeve 9 by bolts, and the lower end is fixed to the bottom of the support 1; the selection static contact 14 is evenly installed on the support 1 through the first insulating rod 15 and is evenly distributed circumferentially outside the first main shaft 13. The selection static contact 14 is provided with a plurality of upper selection static contacts 141 and a plurality of lower selection static contacts 142 corresponding to each phase of the power supply (as shown in FIG. Figure 5 As shown), each phase includes a circle of upper selection static contacts 141 (plural) and a circle of lower selection static contacts 142 (plural), all upper selection static contacts 141 of each phase are located at the same height, and all lower selection static contacts 142 of each phase are also located at the same height but below the upper selection static contacts 141; the selection moving contact 16 is rotatably mounted on the first main shaft 13 and is located between the first main shaft 13 and the selection static contact 14; the selection moving contact 16 is provided with an upper selection moving contact 161 and a lower selection moving contact 162 (as shown) for each phase of the power supply. Figure 7 As shown, the upper selective moving contact 161 of each phase corresponds to the upper selective static contact 141 of that phase (located at the same height) and is connected to the upper sheave 2 via a first connecting rod 17, allowing it to rotate under the drive of the upper sheave 2. The lower selective moving contact 162 of each phase corresponds to the lower selective static contact 142 of that phase (located at the same height) and is connected to the lower sheave 10 via a second connecting rod 18, allowing it to rotate under the drive of the lower sheave 10. The upper selective moving contact 161 and the lower selective moving contact 162 operate alternately.

[0054] The polarity converter includes a second sleeve 19, a gear 20, a transmission gear 21, a polarity conversion groove member 22, a groove rod 23, a second main shaft 24, a polarity conversion static contact 25, and a polarity conversion moving contact 27. The second sleeve 19 is vertically fixed on the support 1 by bolts. The gear 20 is rotatably mounted on the second sleeve 19 (through a bearing or a bushing). The transmission gear 21 is fan-shaped. One end of the transmission gear 21 is rotatably sleeved outside the transmission shaft 3, and the other end meshes with the gear 20. One end of the polarity conversion groove member 22 is fixedly connected to the transmission gear 20 through an elastic pin and a bolt, and the other end points to the lower sheave 10 and has a second groove 29 on the side where it points to the lower sheave 10 (as Figure 10 shown in Figure 11 ). The groove rod 23 is fixed on the lower sheave 10 and can swing the second groove 29 of the polarity conversion groove member 22 in the positive and negative directions under the drive of the lower sheave 10, so that the polarity conversion groove member 22 rotates in the positive and negative directions. The upper end of the second main shaft 24 is coaxially and fixedly connected to the second sleeve 19 by bolts, and the lower end is fixed at the bottom of the support 1. The polarity conversion static contact 25 is installed on the outer periphery of the second main shaft 24 through a second insulating rod 26 and is divided into a positive polarity conversion static contact 251 and a negative polarity conversion static contact 252 (as Figure 7 shown in

[0055] ). The polarity conversion moving contact 27 is rotatably mounted on the second main shaft 24 and is connected to the gear 20 through a third connecting rod 28. After the polarity conversion moving contact 27 rotates in the positive and negative directions under the drive of the gear 20, it alternately contacts the positive polarity conversion static contact 251 and the negative polarity conversion static contact 252.When the gear needs to be switched, the electric mechanism drives the transmission shaft 3 to rotate, driving the groove wheel shifting member 11 to rotate. The shifting rollers 12 at both ends of the groove wheel shifting member 11 alternately extend between the upper groove wheel 2 and the lower groove wheel 10 as the groove wheel shifting member 11 rotates, alternately shifting the upper groove wheel 2 and the lower groove wheel 10 to rotate. The upper groove wheel 2 and the lower groove wheel 10 alternately move once every 180 degrees. When the shifting roller 12 on the upper side of one end of the groove wheel shifting member 11 shifts the upper groove wheel 2 to rotate once, the upper groove wheel 2 drives the upper layer 2 through the first connecting rod 17. The selection moving contact 161 rotates to the next gear and contacts the lower selection static contact 141 of the next gear; similarly, when the groove wheel shifting member 11 continues to rotate 180 degrees, the shifting roller 12 on the lower side of the other end of the groove wheel shifting member 11 shifts the lower groove wheel 10 to rotate once, and the lower groove wheel 10 drives the lower selection moving contact 162 to rotate to the next gear through the second connecting rod 18 and contacts the lower selection static contact 142 of the next gear. The upper groove wheel 2 and the lower groove wheel 10 continuously alternate in this way to achieve gear switching. Whether the upper groove wheel 2 continuously rotates to the maximum gear position in the forward direction or to the minimum gear position in the reverse direction, it will be restricted by the limit device to prevent the contact selector contact from exceeding the gear position, causing the tap changer to fail to extinguish the arc, resulting in a major accident of burning the transfer switch, and ensuring the quality of the tap changer. Moreover, no matter the upper sheave 2 switches from the maximum gear position to the minimum gear position, or switches from the minimum gear position to the maximum gear position, the upper sheave 2 needs to rotate two circles.

[0056] The positive and negative polarity switching of the polarity converter is achieved by the shifting rod 23 on the lower groove wheel 10 shifting the second groove 29 of the polarity conversion shifting member 22, causing the transmission gear 21 to rotate and drive the gear 20 to rotate. The gear 20 then drives the polarity conversion moving contact 27 to rotate forward and reverse through the third connecting rod 28, alternately contacting the positive polarity conversion static contact 251 and the negative polarity conversion static contact 252.

[0057] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0058] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements that are inherent to such process, method, article, or apparatus.

[0059] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A multi - gear forward - reverse adjustable tap selector, characterized in that: It includes a selector contact limiting mechanism, the selector contact limiting mechanism includes a transmission shaft and an upper groove wheel that are respectively rotatably arranged, and a limiting device, the limiting device includes a limiting groove member, a limiting rod and a limiting pin; One end of the limit slot member is rotatably mounted on the transmission shaft, and the other end points to the upper groove wheel; one end of the limit rod is fixed to the limit slot member, and the other end extends outward and forms an acute angle between the limit slot member and the limit rod, which can be driven by the limit slot member to approach or move away from the upper groove wheel; a groove one is provided on the side of the limit slot member pointing to the upper groove wheel at the other end of the limit slot member; a limit slot is provided on the side of the limit slot member away from the limit rod; the limit pin is fixed on the upper groove wheel and corresponds to the position of the groove one and the limit slot; the limit pin can rotate with the upper groove wheel and toggle the groove one to make the limit slot member rotate, and the limit pin can continue to rotate with the upper groove wheel after toggling the limit slot member until it hits the other end of the limit rod or is stuck in the limit slot, making it difficult for the upper groove wheel to rotate; One end of the limit rod is rotatably sleeved outside the transmission shaft and is fixed to the limit slot member through an elastic pin and a bolt; The limiting pin is rotatably provided with a roller that matches the groove 1 and the limiting groove; It also includes a hollow support and a contact selector and a polarity converter mounted side by side in the support, wherein the selector contact limiting mechanism is mounted on the support and connected between the contact selector and the polarity converter; the transmission shaft is rotatably mounted on the support; The contact selector includes a first sleeve, a lower groove wheel, a groove wheel shifting member, a first main shaft, a selection static contact and a selection moving contact; The first sleeve is vertically fixed on the support; The upper groove wheel is rotatably mounted on the first sleeve; The lower sheave is rotatably mounted on the first sleeve and is located below the upper sheave; The middle part of the groove wheel shifting member is fixed on the transmission shaft, and a shifting roller is installed at each end of the groove wheel shifting member, one positive and one negative. The two ends of the groove wheel shifting member can alternately extend between the upper groove wheel and the lower groove wheel as the groove wheel shifting member rotates to alternately shift the lower groove wheel and the upper groove wheel; The upper end of the first main shaft is fixedly connected to the first sleeve, and the lower end is fixed to the bottom of the support; The selective static contacts are evenly mounted on the support through the first insulating rod and are evenly distributed outside the first main shaft in a circumferential manner. The selective static contacts are provided with a plurality of upper selective static contacts and a plurality of lower selective static contacts corresponding to each phase of the power supply; The selective moving contact is rotatably mounted on the first main shaft and is located between the first main shaft and the selective static contact; the selective moving contact is provided with an upper selective moving contact and a lower selective moving contact corresponding to each phase of the power supply, the upper selective moving contact of each phase corresponds to the position of the upper selective static contact of the phase and is connected to the upper groove wheel, and the lower selective moving contact of each phase corresponds to the position of the lower selective static contact of the phase and is connected to the lower groove wheel.

2. The multi-step positive and negative tap selector according to claim 1, characterized in that: When the limit slot member drives the other end of the limit rod close to the upper groove wheel, the other end of the limit rod is located on the rotation path of the limit pin; when the limit slot member drives the other end of the limit rod away from the upper groove wheel, the limit slot is located on the rotation path of the limit pin.

3. The multi-step positive and negative adjustable tap selector according to claim 1, characterized in that: The sum of the rotation radius of the limiting pin and the rotation radius of the limiting groove is greater than the distance from the center of the transmission shaft to the center of the upper groove wheel.

4. The multi-step positive and negative tap selector according to any one of claims 1-3, characterized in that: The polarity converter includes a second sleeve, a second main shaft, a gear, a transmission gear, a polarity conversion groove member, a groove rod, a polarity conversion static contact, and a polarity conversion moving contact; The second sleeve is vertically fixed on the support; The upper end of the second main shaft is fixedly connected to the second sleeve, and the lower end is fixed to the bottom of the support; The gear is rotatably mounted on the second sleeve; One end of the transmission gear is rotatably sleeved outside the transmission shaft, and the other end meshes with the gear; One end of the polarity conversion groove member is fixedly connected to the transmission gear, and the other end points to the lower sheave and has a second groove on the side pointing to the lower sheave; The groove rod is fixed on the lower sheave and can drive the second groove of the polarity conversion groove member to move forward and backward under the drive of the lower sheave, so that the polarity conversion groove member rotates forward and backward; The polarity conversion static contact is installed on the outer periphery of the second main shaft through a second insulating rod and is divided into a positive polarity conversion static contact and a negative polarity conversion static contact; The polarity conversion moving contact is rotatably mounted on the second main shaft and is connected to the gear. After the polarity conversion moving contact rotates forward and backward under the drive of the gear, it alternately contacts the positive polarity conversion static contact and the negative polarity conversion static contact.

5. The multi-step positive and negative adjustable tap selector according to claim 4, characterized in that: One end of the transmission gear is rotatably sleeved outside the transmission shaft and is fixed to the polarity conversion groove member through an elastic pin and a bolt.

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