Gear shift position limiting and locking device

Abstract

The utility model discloses a gear shift limiting locking device, including gear position indicator, transmission shaft, positioning hole, handle and limiting piece, gear position indicator is equipped with gear number, transmission shaft rotation sleeve is set in the hole of gear position indicator middle part default and its upper end reaches gear position indicator top, positioning hole is a few set on gear position indicator and with gear position indicator on gear number one to one correspondence's through -hole, handle is located gear position indicator top and is fixed on transmission shaft, limiting piece is screwed on handle default screw hole in and its lower end points to gear position indicator, and limiting piece can with handle's rotation respectively aim at the positioning hole on gear position indicator, after limiting piece alignment positioning hole, its lower end can spiral down and insert into positioning hole. The utility model discloses simple structure can effectively solve the problem that operator gear shift is not in position, make no excitation tap changer work its performance can be maximum application, avoid various because gear shift is not in position lead to unnecessary safety hidden danger.

Description

Technical Field

[0001] This utility model relates to the field of tap changer technology, specifically to a shift limit locking device. This device is used in a strip-type de-energized tap changer to ensure the accuracy of shifting in the de-energized state. Background Technology

[0002] When manually shifting the tap changer of a strip-type off-grid tap changer, it is essential to ensure accurate and complete shifting to guarantee the optimal performance of the switch. Improper operation leading to incomplete shifting can cause poor contact and burnout of the contacts, breakage of the tap leads, transformer malfunction, and in severe cases, endanger personal safety.

[0003] In practical applications of non-excited tap changers, serious accidents have occurred due to incomplete tap shifting. During maintenance, negligence led to incomplete tap shifting, resulting in a loose connection between the contacts. Prolonged overheating caused the insulating oil to decompose, producing flammable gases, ultimately triggering an internal arc and an oil tank explosion. Several similar incidents have occurred. Therefore, accurate tap shifting of non-excited tap changers is crucial for the normal operation of transformers. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a shift limit locking device that ensures accurate shifting of the de-energized tap changer, thereby preventing transformer malfunctions and the resulting series of serious accidents.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A gear shifting limit locking device includes a gear position indicator fixedly mounted on a transformer and a drive shaft rotatably mounted inside the transformer. The upper surface of the gear position indicator has several gear position numbers for indicating the gear position. The drive shaft is rotatably fitted into a pre-set hole in the middle of the gear position indicator, with its upper end extending above the gear position indicator. It also includes positioning holes, a handle, and limiting members. The positioning holes are several through holes set on the gear position indicator and corresponding one-to-one with the gear position numbers on the gear position indicator. The handle is located above the gear position indicator and fixed to the drive shaft. The limiting member is threadedly connected to a pre-set threaded hole on the handle, with its lower end pointing towards the gear position indicator. The limiting member can align with the positioning holes on the gear position indicator as the handle rotates. After the limiting member aligns with the positioning holes, its lower end can spiral downwards and insert into the positioning holes.

[0007] Furthermore, the shift limit locking device also includes a locking mechanism, which includes a lock hole and a lock. The lock hole is disposed on the limit member and penetrates the limit member perpendicularly. The lock is a padlock. When the lower end of the limit member is inserted into the positioning hole, the lock beam of the padlock passes through the lock hole and is re-fastened into the lock body of the padlock. When the lower end of the limit member is inserted downward into the positioning hole, the lock hole is located between the lower surface of the handle and the upper surface of the gear position indicator. When the lower end of the limit member is disengaged upward from the positioning hole, the lock hole moves into the threaded hole of the handle.

[0008] This utility model has a simple structure and can effectively solve the problem of operators not shifting gears properly, so that the performance of the de-energized tap changer can be maximized when it is working, and avoids various unnecessary safety hazards caused by improper gear shifting. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings.

[0010] Figure 1 This is a schematic diagram of the gear shifting limit locking device described in this utility model.

[0011] Figure 2 This is a rear view of the shifting limit locking device described in this utility model.

[0012] Figure 3 This is a schematic diagram of the gear position indicator of this utility model.

[0013] Figure 4 This is a schematic diagram of the structure of the limiting member described in this utility model.

[0014] The diagram shows: 1-drive shaft, 2-mounting flange, 3-gear indicator, 4-positioning hole, 5-handle, 6-limiting component, 61-tightening part, 62-screw part, 63-locking rod part, 7-locking hole, 8-gear number. Detailed Implementation

[0015] The following specific embodiments illustrate the implementation 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 merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0018] like Figure 1 and Figure 2 As shown, this embodiment provides a gear shifting limit locking device, including a mounting flange 2, a gear position indicator 3, a drive shaft 1, a handle 5, and a limit member 6.

[0019] The mounting flange 2 is fixed to the transformer, and a bearing (such as a bushing) is fixed inside the mounting flange 2 (inner hole or center hole).

[0020] The gear position indicator 3 is fixed to the top of the mounting flange 2 by two bolts (that is, the gear position indicator 3 is mounted on the transformer through the mounting flange 2). The upper surface of the gear position indicator 3 is provided with a number of gear position numbers 8 for indicating the gear position. In this embodiment, the gear position indicator 3 shows the gear position numbers 8 corresponding to gears 1-5 respectively. The gear position indicator 3 is provided with a number of positioning holes 4. The positioning holes 4 are through holes that correspond one-to-one with the gear position numbers 8 on the gear position indicator 3. Each positioning hole 4 is located inside the corresponding gear position number 8.

[0021] The drive shaft 1 is a transmission component for shifting gears in a bar-type non-excitation tap changer. It is generally long and rod-shaped, with its lower end mounted on the bar-type non-excitation tap changer inside the transformer. Rotation of the drive shaft 1 drives gear switching. The upper end of the drive shaft 1 is rotatably fitted into a pre-set hole in the center of the gear position indicator 3, extending above the indicator 3. Simultaneously, the upper end of the drive shaft 1 is also rotatably fitted into a bearing within the mounting flange 2.

[0022] The handle 5 is located above the gear position indicator 3 and is bolted to the drive shaft 1. Rotating the handle 5 allows the drive shaft 1 to rotate axially. The lower part of the handle 5 is horizontally positioned above the gear position indicator 3 and is bolted to the drive shaft 1. The upper part of the handle 5 is first bent upwards and then downwards to form a C-shaped structure (the handle 5 is designed to bend according to the normal size of an adult's palm to ensure user comfort). The handle 5 consists of two horizontal bars, one long and one short, positioned horizontally above the gear position indicator 3, and a vertical bar integrated between the two horizontal bars, with the shorter bar at the bottom and the longer bar at the bottom). To ensure product traceability, product-related information is laser-printed on the top and sides of the handle 5 (the top and sides of the long bar). The product information on the handle allows for quick location of relevant production information, greatly improving the efficiency of subsequent maintenance and repair.

[0023] The limiting member 6 is threaded into a pre-set threaded hole on the handle 5 (the short crossbar at the bottom). The lower end (vertical) of the limiting member 6 points towards the gear position indicator 3. The limiting member 6 can align with the positioning hole 4 on the gear position indicator 3 as the handle 5 rotates. After the limiting member 6 is aligned with the positioning hole 4, its lower end can spiral down and insert into the positioning hole 4. The limiting member 6 includes a rotating part 61, a screw part 62, and a locking rod part 63, which are coaxially fixed together and are all cylindrical. The rotating part 61 is located on the side of the handle 5 facing away from the gear position indicator 3. The outer surface of the rotating part 61 is provided with anti-slip texture (knurling). The screw part 62 is provided with external threads and is threaded into a pre-set threaded hole on the handle 5. The locking rod part 63 can be inserted into or disengaged from the positioning hole 4 as the screw part 62 moves up and down. The locking rod part 63 slides into the positioning hole 4, and the locking rod part 63 can easily slide into the positioning hole 4, but still maintains a tight connection.

[0024] To ensure that the bar-type non-excitation tap changer shift limit locking device can be used normally in harsh environments such as humidity and exposure to sunlight, the entire device is made of 316L material to avoid oxidation and rust in harsh environments over a long period of time, thereby reducing its service life.

[0025] When shifting gears in the strip-type non-excitation tap changer, manually operate the handle 5 to shift gears according to the gear number 8 on the gear position indicator 3. When the gear is roughly shifted, rotate the limit member 6 downwards and rotate the handle 5 to fine-tune the gear position so that the locking rod part 63 of the limit member 6 aligns with the positioning hole 4 of the corresponding gear on the gear position indicator 3. Continue to rotate the limit member 6 downwards so that the locking rod part 63 at the bottom of the limit member 6 engages in the positioning hole 4 of the gear position indicator 3, thus ensuring the accuracy of the shift position and the self-locking property of the switch gear under vibration and shaking. Example 2

[0026] To further ensure the self-locking function of the gear positions, prevent unauthorized operation by non-professional personnel, and guarantee the normal operation of the equipment and personal safety, this embodiment adds the following structure based on embodiment 1.

[0027] The shift limit locking device further includes a locking mechanism, which includes a lock hole 7 and a lock. The lock hole 7 is disposed on the limit member 6 and passes vertically through the limit member 6. The lock is a padlock. When the lower end of the limit member is inserted into the positioning hole 4, the lock beam of the padlock passes through the lock hole 7 and is re-fastened into the lock body of the padlock. When the lower end of the limit member 6 is inserted downward into the positioning hole 4, the lock hole 7 is located between the lower surface of the handle 5 and the upper surface of the gear position indicator 3. When the lower end of the limit member 6 is disengaged upward from the positioning hole 4, the lock hole 7 moves into the threaded hole of the handle 5.

[0028] After the locking bar 63 at the bottom of the limiting component 6 is inserted into the positioning hole 4 of the gear position indicator 3, the lock beam of the padlock is passed through the lock hole 7 and re-attached to the lock body of the padlock to lock it, further ensuring the self-locking of the gear position. The padlock key is kept by the professional operator to prevent non-professional operators from performing illegal operations, ensuring the normal operation of the equipment and personal safety.

[0029] Installation steps: First, use two sets of M6×12 hexagonal head bolts and spring flat washers to install the gear position indicator 3 on the transformer mounting flange 2 (the mounting flange 2 has been pre-fixed to the transformer). Then, use special bolts and self-locking nuts to install the handle 5 on the drive shaft 1 of the strip-shaped non-excitation tap changer. Finally, install the limit piece 6 into the handle 5 (in the pre-set screw hole). If necessary, hang the padlock in the locking hole 7 of the limit piece 6 to complete the installation of the gear shift limit locking device.

[0030] Operating Procedures: Perform the gear shifting operation with the bar-type de-energized tap changer powered off. If a padlock is present, remove it first. Twist the rotating part 61 of the limiting member 6 by hand, from bottom to top, causing the screw part 62 and locking rod part 63 to move downwards until the locking rod part 63 at the bottom of the limiting member 6 is fully exposed above the positioning hole 4 of the gear indicator 3. Rotate the handle 5 by hand, driving the gear and rack transmission mechanism via the drive shaft 1 to achieve the gear shifting operation. After rotating to the desired gear position, twist the limiting member 6 downwards to check if the locking rod part 63 can be smoothly inserted into the positioning hole 4 of the gear indicator 3 (whether the locking rod part 63 is aligned with the positioning hole 4 of the designated gear). Adjust the gear position by rotating the handle 5. Continue rotating and lowering the limiting member 6 until the locking rod part 63 of the limiting member 6 can be fully and smoothly inserted into the positioning hole 4 of the gear indicator 3. If necessary, engage the padlock to complete a precise gear shift.

[0031] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0032] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A gear shifting limit locking device, comprising a gear position indicator fixedly mounted on a transformer, and a drive shaft rotatably mounted inside the transformer; the upper surface of the gear position indicator is provided with a plurality of gear position numbers for indicating the gear position; the drive shaft is rotatably sleeved in a pre-set hole in the middle of the gear position indicator and its upper end extends above the gear position indicator; characterized in that: It also includes positioning holes, a handle, and limiting components; the positioning holes are several through holes set on the gear position indicator and corresponding one-to-one with the gear position numbers on the gear position indicator; the handle is located above the gear position indicator and fixed on the drive shaft; the limiting component is threaded into a pre-set threaded hole on the handle and its lower end points towards the gear position indicator; the limiting component can be aligned with the positioning holes on the gear position indicator as the handle is rotated; after the limiting component is aligned with the positioning hole, its lower end can be spirally moved down and inserted into the positioning hole.

2. The shifting limit locking device according to claim 1, characterized in that: It also includes a mounting flange, which is fixed to the transformer; the gear position indicator is fixed to the mounting flange by bolts; and the drive shaft is rotatably sleeved inside the mounting flange.

3. The shift limit locking device according to claim 2, characterized in that: A bushing is installed between the mounting flange and the drive shaft. The bushing is rotatably fitted around the drive shaft and fixedly connected to the mounting flange.

4. The shift limit locking device according to claim 1, characterized in that: The lower part of the handle is horizontally positioned above the gear indicator and is fixedly connected to the drive shaft by bolts. The upper part of the handle is first bent upwards and then bent downwards to form a C-shaped structure. The limiting part is threadedly connected to the lower part of the handle.

5. The shift limit locking device according to claim 1, characterized in that: The limiting component includes a screw part, a screw part, and a locking rod part that are coaxially fixed together in sequence; the screw part is located on the side of the handle facing away from the gear position indicator, the screw part is threadedly connected to the handle, and the locking rod part can be inserted into or disengaged from the positioning hole as the screw part moves up and down.

6. The shift limit locking device according to claim 5, characterized in that: Anti-slip texture is provided on the outer side of the twisting part.

7. The shift limit locking device according to claim 5, characterized in that: The locking rod portion slides into the positioning hole.

8. The shift limit locking device according to claim 1, characterized in that: Product information is displayed on the top and sides of the handle.

9. The shift limit locking device according to any one of claims 1-8, characterized in that: It also includes a locking mechanism, which includes a keyhole and a lock. The keyhole is located on the limiting member and passes vertically through the limiting member. The lock is a padlock. When the positioning hole is inserted into the lower end of the limiting member, the lock beam of the padlock passes through the keyhole and is re-fastened to the lock body of the padlock.

10. The shift limit locking device according to claim 9, characterized in that: When the lower end of the limiting component is inserted downward into the positioning hole, the locking hole is located between the lower surface of the handle and the upper surface of the gear indicator. When the lower end of the limiting component is disengaged upward from the positioning hole, the locking hole moves into the threaded hole of the handle.

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