Voltage transformer cabinet and operating hole locking device thereof

Abstract

The utility model discloses an operating hole locking device, which comprises a base fixed on the outer wall of a cabinet body of a voltage transformer cabinet, and the base is positioned on one side of an operating hole of a handcart type voltage transformer along the radial direction of the operating hole of the handcart type voltage transformer; a locking piece is arranged on the base and comprises an adjusting section movably arranged on the base and a blocking section capable of being matched with an operation hole of the handcart type voltage transformer in an aligned shielding mode. The plugging section is arranged at one end, facing an operation hole of the handcart type voltage transformer, of the adjusting section in a linkage mode in the moving direction of the adjusting section. The operating hole locking device can be used for reliably limiting and locking the handcart type voltage transformer so as to ensure that the handcart type voltage transformer is stably positioned at a working position and reliably runs. The utility model further discloses a voltage transformer cabinet using the operating hole locking device.

Description

Technical Field

[0001] The utility model relates to the technical field of supporting equipment for medium-voltage system voltage transformer cabinets, and particularly relates to an operation hole locking device. The utility model also relates to a voltage transformer cabinet applying the operation hole locking device. Background Art

[0002] In current nuclear power plants and other working conditions involving large-scale power transmission and transformation systems, it is usually necessary to equip voltage transformer cabinets as supporting equipment for devices such as generators.

[0003] Generally, a plurality of functional devices including medium-voltage busbars and trolley-type voltage transformers are arranged inside the voltage transformer cabinet. Among them, during the operation of the voltage transformer, voltage signals at the generator outlet end are collected for related working condition parameter measurement, relay protection, and excitation regulation and other working condition supporting requirements.

[0004] Under the normal load-bearing working condition of the generator, the trolley-type voltage transformer is rocked into the working position for voltage signal collection. The trolley-type voltage transformer is not equipped with any locking device at its working position to lock its position. As a result, during the actual operation process, there is a defect that the trolley-type voltage transformer can be rocked out to the isolation position during the generator's load operation. This will cause the voltage transformer to be unable to collect the generator voltage signal, and further cause related unit equipment to trip, posing a major safety hazard to the operation of power system equipment.

[0005] In view of this, how to provide a reliable limit locking for the trolley-type voltage transformer to ensure that it stably stays in the working position and operates reliably is an important technical problem that needs to be solved by those skilled in the art at present. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an operation hole locking device that can reliably limit and lock the trolley-type voltage transformer to ensure that it stably stays in the working position and operates reliably. Another purpose of the utility model is to provide a voltage transformer cabinet applying the above operation hole locking device.

[0007] To solve the above technical problems, the utility model provides an operation hole locking device, which includes a base fixed on the outer wall of the voltage transformer cabinet. The base is located on one side of the operation hole of the trolley-type voltage transformer along the radial direction of the operation hole of the trolley-type voltage transformer.

[0008] A locking piece is provided on the base, and the locking piece includes an adjustment section movably arranged on the base and a blocking section that can cooperate with the operating hole of the trolley-type voltage transformer to block and cover the operating hole of the trolley-type voltage transformer. The blocking section is linked to the moving direction of the adjustment section and is arranged at one end of the adjustment section facing the operating hole of the trolley-type voltage transformer.

[0009] Preferably, the base comprises a substrate fixed on the outer wall of the voltage transformer cabinet, a support plate is provided on each side of the substrate, the two support plates are symmetrically arranged along the width direction of the substrate, the main extension surface of the substrate is parallel to the plane of the outer wall of the voltage transformer cabinet where the substrate is located, and the main extension surfaces of the two support plates are perpendicular to the main extension surface of the substrate;

[0010] The middle part of the support plate is provided with a guide hole, the adjustment section can be reciprocatingly moved and inserted into the guide hole, and the two ends of the adjustment section extend out of the outer side walls of the two support plates respectively;

[0011] The blocking section is arranged on the outer side of the support plate close to the operation hole of the two support plates.

[0012] Preferably, a stopper capable of abutting against an inner side wall of the support plate is detachably provided on the adjustment section.

[0013] Preferably, a locking hole is penetrated through the middle of the adjusting section along a direction perpendicular to the moving direction of the adjusting section, and the limiting member is a locking pin inserted into the locking hole.

[0014] Preferably, there are at least two locking holes, and the locking holes are evenly spaced along the moving direction of the adjustment section.

[0015] Preferably, an anti-dropping piece capable of abutting against an outer side wall of the support plate is respectively provided on the free end of the adjusting section and the blocking section.

[0016] Preferably, the locking member is an integrally formed rod-shaped member, and the anti-slip member is a boss protruding from the outer peripheral walls at both ends of the locking member.

[0017] Preferably, the locking member and the base are both made of stainless steel.

[0018] The utility model also provides a voltage transformer cabinet, including a cabinet body capable of accommodating a trolley-type voltage transformer, the side wall of the cabinet body having an operating hole adapted to the trolley-type voltage transformer, the cabinet body being provided with an operating hole locking device matched with the operating hole, and the operating hole locking device being an operating hole locking device as described in any one of the above items.

[0019] Compared with the above prior art, during the assembly, operation and use of the operating hole locking device provided by the utility model, the base is arranged on one side of the operating hole located on the cabinet body of the voltage transformer cabinet, and the base is reliably fixed and installed on the outer wall of the voltage transformer cabinet. After the handcart type voltage transformer is pushed into the interior of the cabinet body of the voltage transformer cabinet, the staff can control and adjust the adjustment section to move moderately, thereby driving the synchronous linkage of the blocking section, realizing the overall position adjustment of the locking part, until the blocking section is aligned and blocked at the orifice of the operating hole. At this time, if the handcart type voltage transformer is moved outwards of the cabinet body, the adapter part located in the operating hole on the handcart type voltage transformer will be blocked and limited by the blocking section, so that the adapter part cannot move outwards from the operating hole, thus preventing the handcart type voltage transformer from being completely removed from the cabinet body. Thus, the handcart type voltage transformer can be reliably limited and locked inside the cabinet body, avoiding the handcart type voltage transformer from being disengaged and moved from the working position due to misoperation or other conditions during the overall operation of the system equipment, thereby avoiding the situation that the handcart type voltage transformer is rocked from the working position to the isolation position during the operation of the system equipment, eliminating the potential safety hazards of the system equipment such as the tripping of the unit equipment caused thereby, and effectively ensuring the stable and reliable operation of the handcart type voltage transformer, and making the operation of the relevant power equipment and system safer and more stable.

[0020] In another preferred embodiment of the present utility model, the base includes a substrate fixed on the outer wall of the voltage transformer cabinet. A support plate is provided on each of the two sides of the substrate. The two support plates are symmetrically arranged along the width direction of the substrate. The main extension plane of the substrate is parallel to the plane where the outer wall of the voltage transformer cabinet where the substrate is located. The main extension planes of the two support plates are perpendicular to the main extension plane of the substrate. A guiding hole is provided in the middle of the support plate. The adjustment section can be reciprocally moved and inserted into the guiding hole in a matching manner. The two ends of the adjustment section respectively extend out of the outer side walls of the two support plates. Among the two support plates, the blocking section is arranged on the outer side of the support plate close to the operating hole. The substrate can be reliably connected to the cabinet body of the voltage transformer cabinet, thereby providing reliable structural support for the support plates and the locking part. On this basis, the two symmetrically arranged support plates are used as the direct matching structure of the locking part, and the position of the blocking section is adjusted in a linked manner by the reciprocal insertion and sliding matching of the adjustment section and the guiding hole, so as to realize the alignment and blocking and the release of the blocking of the operating hole, thereby meeting the actual operation requirements of the handcart type voltage transformer in specific working conditions. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 The front view of the base of the operation hole locking device provided by a specific embodiment of the present invention;

[0023] Figure 2 For Figure 1 The top view;

[0024] Figure 3 For Figure 1 The side view;

[0025] Figure 4 The top view of the locking member of the operation hole locking device provided by a specific embodiment of the present invention.

[0026] Wherein:

[0027] 10 - Base;

[0028] 11 - Substrate;

[0029] 12 - Support plate; 121 - Guide hole;

[0030] 20 - Locking member;

[0031] 21 - Adjustment section; 211 - Lock hole;

[0032] 22 - Sealing section;

[0033] 23 - Anti - detachment member. Specific embodiments

[0034] The core of the present invention is to provide an operation hole locking device, which can reliably limit and lock the handcart - type voltage transformer to ensure that it is stably in the working position and operates reliably; in addition, a voltage transformer cabinet applying the above - mentioned operation hole locking device is also provided.

[0035] To enable those skilled in the art to better understand the solution of the present invention, the following will further elaborate on the present invention in combination with the drawings and specific embodiments.

[0036] It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, in the present invention, unless otherwise clearly stipulated and limited, a first feature “on” or “under” a second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature therebetween.

[0038] In addition, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] Please refer to Figures 1 to 4 .

[0040] In a specific implementation, the operation hole locking device provided by the utility model includes a base 10 fixed on the outer wall of the voltage transformer cabinet, and the base 10 is located on one side of the operation hole of the trolley-type voltage transformer along the radial direction of the operation hole of the trolley-type voltage transformer.

[0041] A locking member 20 is provided on the base 10, and the locking member 20 includes an adjustment section 21 movably provided on the base 10 and a blocking section 22 that can be aligned and blocked with the operating hole of the trolley-type voltage transformer. The blocking section 22 is linked along the moving direction of the adjustment section 21 and is arranged at one end of the adjustment section 21 facing the operating hole of the trolley-type voltage transformer.

[0042] During assembly and operation, the base 10 is arranged on one side of the operating hole on the cabinet of the voltage transformer cabinet, and the base 10 is reliably fixed and installed on the outer wall of the cabinet of the voltage transformer cabinet. After the trolley-type voltage transformer is pushed into the cabinet of the voltage transformer cabinet, the staff can control the adjustment section 21 to move appropriately, thereby driving the synchronous linkage of the blocking section 22, and realizing the overall position adjustment of the locking member 20, until the blocking section 22 is aligned and blocked at the opening of the operating hole. At this time, if the trolley-type voltage transformer is operated to move outside the cabinet, the adapter part of the trolley-type voltage transformer located in the operating hole will be blocked and limited by the blocking section 22, so that the adapter part cannot move outward from the operating hole, so that the trolley-type voltage transformer cannot be removed from the cabinet as a whole.

[0043] In this way, the trolley-type voltage transformer can be reliably limited and locked inside the cabinet, preventing the trolley-type voltage transformer from being dislodged and moved from the working position due to misoperation or other situations during the overall operation of the system equipment, thereby avoiding the trolley-type voltage transformer from being shaken out of the working position to the isolation position during the operation of the system equipment, eliminating the related system equipment safety hazards such as unit equipment tripping caused by this, thereby effectively ensuring the smooth and reliable operation of the trolley-type voltage transformer, and making the operation of related power equipment and systems safer and more stable.

[0044] When the trolley-type voltage transformer needs to be pulled out of the cabinet, the adjustment section 21 can be controlled to move in the opposite direction and reset, thereby driving the blocking section 22 to reset in conjunction, thereby releasing the positioning blockage at the opening of the operating hole, so that the adapter part on the trolley-type voltage transformer can be pulled out of the operating hole, thereby realizing the overall withdrawal of the trolley-type voltage transformer from the cabinet to meet the corresponding working condition operation requirements.

[0045] In addition, it should be noted that, for the equipment layout under general working conditions, the operating hole locking device is usually arranged horizontally on one side of the operating hole on the cabinet to match the operating habits of the staff under most working conditions, and the reciprocating movement of the locking member 20 is also along the horizontal direction. Of course, depending on the actual working conditions, the operating hole locking device can also be arranged above, below or at other relative positions of the operating hole on the cabinet, and the staff can flexibly select and adjust according to the actual application requirements. But in principle, the blocking and locking effect of the blocking section 22 on the operating hole should be guaranteed.

[0046] Specifically, the base 10 includes a substrate 11 fixed to the outer wall of the voltage transformer cabinet. On each side of the substrate 11, there is a support plate 12. The two support plates 12 are symmetrically arranged along the width direction of the substrate 11. The main extension plane of the substrate 11 is parallel to the plane of the outer wall of the voltage transformer cabinet where the substrate 11 is located, and the main extension planes of the two support plates 12 are perpendicular to the main extension plane of the substrate 11. The middle of the support plate 12 has a guiding hole 121, and the adjusting section 21 can be reciprocally and movably inserted into the guiding hole 121 in a position-aligned manner. The two ends of the adjusting section 21 respectively extend out of the outer side walls of the two support plates 12. On the two support plates 12, a blocking section 22 is arranged on the outer side of the support plate 12 close to the operation hole.

[0047] It is not difficult to understand that the inner side wall of the support plate 12 refers to the outer wall of any support plate 12 facing the other support plate 12, and the outer side wall of the support plate 12 refers to the outer wall of any support plate 12 facing away from the other support plate 12. The relevant expressions regarding the inner side wall and the outer side wall of the support plate 12 in the rest of this article can be understood correspondingly with reference to this, and will not be elaborated further.

[0048] The substrate 11 can be reliably connected to the cabinet body of the voltage transformer cabinet, thereby providing reliable structural support for the support plates 12 and the locking member 20. On this basis, two symmetrically arranged support plates 12 are used as the direct adaptation structure of the locking member 20, and the position-aligned insertion and sliding adaptation of the adjusting section 21 and the guiding hole 121 are used to realize the linkage adjustment of the position of the blocking section 22, so as to realize the position-aligned blocking and unblocking of the operation hole, thereby meeting the actual operation requirements of the handcart-type voltage transformer in specific working conditions.

[0049] Generally, the substrate 11 is preferably arranged in a fitting manner with the outer wall of the voltage transformer cabinet to reduce the structural vibration at the substrate 11 during the operation of the equipment and avoid the loosening and misalignment of the substrate 11.

[0050] Under normal circumstances, the substrate 11 is reliably fixed to the outer wall of the cabinet body of the voltage transformer cabinet by screws, so that the substrate 11 can be removed from the cabinet body when necessary, facilitating corresponding component maintenance or replacement operations. Of course, the substrate 11 can also be welded to the outer wall of the cabinet body to further improve the assembly strength of the substrate 11 and the cabinet body.

[0051] On this basis, a limiting member capable of abutting against the inner side wall of the support plate 12 is detachably arranged on the adjustment section 21. After the blocking section 22 blocks and locks the operation hole in place, the limiting member can be reliably installed on the adjustment section 21, so as to ensure the stable relative matching position between the adjustment section 21 and the support plate 12 through the abutting fit between the limiting member and the inner side wall of the support plate 12, and thereby realize the position locking of the blocking section 22, avoiding the loosening or dislocation of the blocking section 22 from the working position during the blocking and locking process of the operation hole, and further optimizing the position locking effect and operation reliability of the operation hole locking device for the handcart type voltage transformer.

[0052] In practical applications, a lock hole 211 runs through the middle of the adjustment section 21 in a direction perpendicular to the moving direction of the adjustment section 21, and the limiting member is a lock pin inserted into the lock hole 211. The insertion and matching structure of the lock pin and the lock hole 211 is simple and reliable, with good limiting effect and easy operation, which can further improve the operation efficiency of the operation hole locking device.

[0053] Of course, in practical applications, the limiting member can also be a lock ring or a lock catch that is detachably matched with the lock hole 211. The staff can flexibly select and adjust the specific type of the limiting member and its matching method with the adjustment section 21 according to the actual working conditions and application requirements. In principle, as long as it can meet the actual application needs of the operation hole locking device, it is acceptable.

[0054] On this basis, there are at least two lock holes 211, and the lock holes 211 are evenly distributed at equal intervals along the moving direction of the adjustment section 21. The equidistant arrangement of multiple lock holes 211 can enable the lock pin to have different matching installation positions, thereby realizing the adaptive adjustment of the extreme extended position of the end of the adjustment section 21 facing the operation hole, and thereby realizing the linkage adjustment of the extreme working position of the blocking section 22, so as to meet the requirements of the operation hole locking device for the alignment blocking and locking adaptation of operation holes with different sizes and specifications under different working conditions.

[0055] On the other hand, anti-detachment members 23 capable of abutting against the outer side wall of the support plate 12 are respectively arranged at the free end of the adjustment section 21 and on the blocking section 22. The anti-detachment member 23 can effectively prevent the main structure of the locking member 20 from falling off the base 10, thereby ensuring that the installation and matching positions of the adjustment section 21 and the blocking section 22 are within the range required by the working conditions and ensuring the operation and application needs of the operation hole locking device.

[0056] More specifically, the locking member 20 is a rod-shaped member formed integrally, and the anti-disengagement members 23 are bosses respectively protruding from the outer peripheral walls at both ends of the locking member 20. The integrally formed structure helps to further optimize the linkage adaptation effect between the adjustment section 21 and the plugging section 22. Moreover, the rod-shaped member is easy to process, and the movement operation is simple and efficient, which can further optimize the controllability and operation efficiency of the movement operation of the locking member 20. Of course, the guiding hole 121 should also be selected as a round hole structure adapted to the rod-shaped member to further optimize the structural adaptability and operation convenience between the adjustment section 21 and the guiding hole 121.

[0057] Furthermore, in practical applications, the anti-disengagement members 23 can be annular bosses protruding from the outer peripheral walls at both ends of the locking member 20 and joined end to end along the circumferential direction of the locking member 20, or can be block-shaped bosses with independent structures, or can be multiple bosses arranged in an array. The staff can flexibly select and adjust the specific structural form of the anti-disengagement members 23 according to the actual working conditions and application requirements. In principle, as long as it can meet the actual application needs of the operation hole locking device, it is acceptable.

[0058] In addition, both the locking member 20 and the base 10 are made of stainless steel. The stainless steel parts have high structural strength, good anti-fatigue and corrosion resistance, which can effectively improve the working condition tolerance and fatigue strength of the locking member 20 and the base 10, so as to meet the requirements of long-term high-intensity frequent operation and use.

[0059] Of course, the specific materials of the locking member 20 and the base 10 can also be selected according to the actual working conditions. In principle, as long as it can ensure the actual application needs of the operation hole locking device, it is acceptable.

[0060] In the specific embodiment, the voltage transformer cabinet provided by the present invention includes a cabinet body capable of accommodating a handcart-type voltage transformer inside. An operation hole adapted to the handcart-type voltage transformer is provided on the side wall of the cabinet body. An operation hole locking device cooperating with the operation hole is provided on the cabinet body, and the operation hole locking device is the operation hole locking device as described above. The operation hole locking device of the voltage transformer cabinet can perform reliable limit locking on the handcart-type voltage transformer to ensure that it is stably in the working position and operates reliably.

[0061] In summary, the operation hole locking device provided in the present invention includes a base fixed on the outer wall of the cabinet of the voltage transformer cabinet. The base is located on one side of the operation hole of the handcart-type voltage transformer along the radial direction of the operation hole of the handcart-type voltage transformer. A locking member is provided on the base. The locking member includes an adjustment section movably arranged on the base and a plugging section capable of being in alignment and occlusion cooperation with the operation hole of the handcart-type voltage transformer. The plugging section is linked and arranged at one end of the adjustment section facing the operation hole of the handcart-type voltage transformer along the moving direction of the adjustment section.

[0062] During its assembly, operation, and use, the base is arranged on one side of the operation hole located on the cabinet body of the voltage transformer cabinet, and the base is fixedly installed on the outer wall of the cabinet body of the voltage transformer cabinet in a reliable manner. After the trolley-type voltage transformer is pushed into the interior of the cabinet body of the voltage transformer cabinet, the staff can control the appropriate movement of the adjustment section, thereby driving the synchronous linkage of the blocking section to achieve the overall position adjustment of the locking member until the blocking section is aligned and blocked at the orifice of the operation hole. At this time, if the trolley-type voltage transformer is operated to move out of the cabinet body, the adapter portion located in the operation hole on the trolley-type voltage transformer will be blocked and limited by the blocking section, so that the adapter portion cannot move out of the operation hole, thereby preventing the trolley-type voltage transformer from being removed from the cabinet body as a whole. Thus, the trolley-type voltage transformer can be reliably limited and locked inside the cabinet body, avoiding the situation that the trolley-type voltage transformer moves out of the working position due to misoperation or other circumstances during the overall operation of the system equipment, thereby avoiding the situation that the trolley-type voltage transformer is rocked from the working position to the isolation position during the operation of the system equipment, eliminating the potential safety hazards of the system equipment such as the tripping of the unit equipment caused thereby, and effectively ensuring the stable and reliable operation of the trolley-type voltage transformer, and making the operation of the relevant power equipment and system safer and more stable.

[0063] The present utility model also provides a voltage transformer cabinet, the operation hole locking device of which can reliably limit and lock the trolley-type voltage transformer to ensure its stable operation in the working position.

[0064] The operation hole locking device provided by the present utility model and the voltage transformer cabinet applying the operation hole locking device have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. An operation hole locking device, characterized in that: It comprises a base fixed on the outer wall of the voltage transformer cabinet, wherein the base is located on one side of the operating hole of the trolley-type voltage transformer along the radial direction of the operating hole of the trolley-type voltage transformer; A locking piece is provided on the base, and the locking piece includes an adjustment section movably provided on the base and a blocking section capable of cooperating with the operating hole of the trolley-type voltage transformer to block and cover the operating hole of the trolley-type voltage transformer. The blocking section is linkedly provided along the moving direction of the adjustment section at one end of the adjustment section facing the operating hole of the trolley-type voltage transformer.

2. The operation hole locking device according to claim 1, characterized in that: The base includes a base plate fixed on the outer wall of the voltage transformer cabinet, a support plate is provided on each side of the base plate, the two support plates are symmetrically arranged along the width direction of the base plate, the main extension surface of the base plate is parallel to the plane of the outer wall of the voltage transformer cabinet where the base plate is located, and the main extension surfaces of the two support plates are perpendicular to the main extension surface of the base plate; The middle part of the support plate is provided with a guide hole, the adjustment section can be reciprocatingly moved and inserted into the guide hole, and the two ends of the adjustment section extend out of the outer side walls of the two support plates respectively; The blocking section is arranged on the outer side of the support plate close to the operation hole of the two support plates.

3. The operation hole locking device according to claim 2, characterized in that: The adjusting section is detachably provided with a limiting piece capable of abutting against the inner side wall of the supporting plate.

4. The operation hole locking device according to claim 3, characterized in that: A locking hole is penetrated through the middle of the adjusting section along a direction perpendicular to the moving direction of the adjusting section, and the limiting member is a locking pin inserted into the locking hole.

5. The operation hole locking device according to claim 4, characterized in that: There are at least two locking holes, and the locking holes are evenly spaced along the moving direction of the adjusting section.

6. The operation hole locking device according to claim 2, characterized in that: The free end of the adjusting section and the blocking section are respectively provided with anti-dropping parts capable of abutting against the outer side wall of the supporting plate.

7. The operation hole locking device according to claim 6, characterized in that: The locking member is an integrally formed rod-shaped member, and the anti-dropping member is a boss protruding from the outer peripheral walls at both ends of the locking member.

8. The operation hole locking device according to claim 1, characterized in that: The locking member and the base are both made of stainless steel.

9. A voltage transformer cabinet, comprising a cabinet body capable of accommodating a trolley-type voltage transformer, the side wall of the cabinet body having an operation hole adapted to the trolley-type voltage transformer, characterized in that: The cabinet body is provided with an operation hole locking device matched with the operation hole, and the operation hole locking device is the operation hole locking device according to any one of claims 1 to 8.

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