An adjustable valve mechanism and low voltage switchgear

Abstract

The application discloses a kind of adjustable valve mechanism and low-voltage switch cabinet, it is related to low-voltage power distribution switchgear technical field.Low-voltage cabinet includes electrical cabinet body, chassis car, guide rail group and adjustable valve mechanism, adjustable valve mechanism includes two valve plates, two guide rods and two-way screw sleeve, two-way screw sleeve is sleeved on guide rod and two ends are equipped with the spiral section of opposite rotation, two valve plates are installed between two two-way screw sleeves by guide sleeve.Two-way screw sleeve is slidably connected with guide rod by guide key, the lower end of two-way screw sleeve is equipped with jaw assembly, jaw assembly includes two clamping claws, and opening and closing control of clamping claw is realized by driving screw rod and limit screw.Transmission mechanism includes bevel gear set, transmission rack and transmission gear, and the automatic opening and closing of valve plate is driven by the push-in and pull-out of chassis car.The application can realize the flexible adjustment of the distance between valve plates and overall height, is suitable for different specifications electrical cabinet, with the advantages of high transmission precision, safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of low-voltage power transmission and distribution switchgear technology, specifically to an adjustable valve mechanism and a low-voltage switchgear. Background Technology

[0002] Low-voltage withdrawable switchgear (low-voltage cabinets) are indispensable and important equipment in power distribution systems, widely used in power distribution and control in data centers, power plants, substations, industrial and mining enterprises, and high-rise buildings. In the circuit breaker compartment of the low-voltage cabinet, the valve mechanism is a key component ensuring the safe operation of the equipment and the personal safety of operators. When the circuit breaker trolley (chassis) is withdrawn, the valve mechanism needs to close quickly to isolate the stationary contact box and prevent operators from accidentally touching live parts; when the circuit breaker trolley is pushed in, the valve mechanism needs to open promptly to reliably engage the moving contact with the stationary contact box.

[0003] Currently, traditional low-voltage switchgear door mechanisms generally employ a linkage drive structure. This type of door mechanism typically consists of components such as linkages, springs, and guide rods. The movement of the circuit breaker trolley drives the linkage mechanism, which in turn drives the door panel to open and close. However, this traditional structure has several drawbacks: Firstly, the transmission accuracy of the linkage mechanism is not high. Due to the numerous connection points and large hinge gaps, wear and loosening are prone to occur during long-term use, leading to asynchronous opening and closing of the valve plate, lateral tilting, or even jamming. Furthermore, the long-term friction between the positioning holes on both sides of the valve plate and the guide rods generates noise, affecting the operating environment of the equipment.

[0004] Secondly, traditional valve mechanisms are difficult to adjust and have low applicability. The vertical spacing of the contact boxes inside low-voltage switchgear varies depending on the specifications, and there are no standardized installation heights; all are set according to actual needs. However, the spacing between the valve plates and the overall height of traditional valve mechanisms are often fixed, making it difficult to adjust to the actual layout of different electrical cabinet specifications. This means that different specifications of electrical cabinets require custom-made valve mechanisms, which not only increases design and manufacturing costs but also extends the production cycle.

[0005] Third, traditional valve mechanisms rely on springs for reset, resulting in poor reliability. Most existing valve mechanisms depend on the elastic potential energy of a stretched spring to achieve valve reset and closure, especially lower valves which rely entirely on spring force to return to the closed state. Springs are prone to fatigue deformation or damage during long-term use. Once a spring fails, the valve cannot close completely, failing to effectively isolate the stationary contact box, posing a serious safety hazard to operators.

[0006] Fourth, the longitudinal transmission rod of the traditional valve mechanism is prone to interference with the fixing bolts and nuts of the stationary contact box mounting plate, resulting in jamming and affecting the normal operation of the valve mechanism.

[0007] In summary, existing low-voltage switchgear door mechanisms have significant shortcomings in terms of transmission accuracy, adjustment flexibility, reliability, and applicability. There is an urgent need for a new type of door mechanism and low-voltage switchgear that can achieve flexible adjustment of door spacing and overall height, reliable transmission, and applicability to electrical cabinets of different specifications. Summary of the Invention

[0008] In view of the above-mentioned defects in the prior art, the present invention provides an adjustable door mechanism and a low-voltage switchgear. The present invention aims to solve the following technical problems: (1) the traditional door mechanism adopts linkage transmission, which has the problems of low accuracy, easy jamming and high noise; (2) the door plate spacing and overall height of the traditional door mechanism are fixed, which cannot be adjusted according to the contact box layout of different electrical cabinets, resulting in low applicability; (3) the traditional door mechanism relies on spring reset, which has poor reliability and safety hazards; (4) the longitudinal transmission rod of the traditional door mechanism is prone to interference with surrounding components.

[0009] To achieve the above objectives, the present invention provides an adjustable door mechanism for installation in an electrical cabinet body to isolate or expose the stationary contact box. The mechanism includes: Two flaps are configured to move vertically toward or away from each other; two guide rods are vertically and rotatably mounted on both sides of the electrical cabinet body; two bidirectional screw sleeves are respectively fitted onto the corresponding guide rods, and the outer wall of each bidirectional screw sleeve has two helical sections with opposite directions of rotation; the two flaps are threadedly engaged with the helical sections of the two bidirectional screw sleeves through the guide sleeves, so that when the bidirectional screw sleeves rotate, the two flaps can move synchronously closer or further away under the guidance of the guide rods.

[0010] A claw assembly is installed at the lower end of the bidirectional screw sleeve and can engage or disengage from the guide rod. When the claw assembly disengages from the guide rod, the bidirectional screw sleeve can drive the valve plate to slide along the axial direction of the guide rod to adjust the overall height of the valve plate. When the claw assembly engages with the guide rod, the axial positions of the bidirectional screw sleeve and the guide rod are relatively fixed.

[0011] Furthermore, the claw assembly includes a hinge seat, two claws, two hinge rods, a push rod, a sliding tooth seat, and a drive screw. The hinge seat is connected to the lower end of the bidirectional screw sleeve, the upper ends of the two claws are hinged to the hinge seat, and the middle portions of the two claws are each connected to the hinge seat via a hinge rod. One end of the hinge rod is hinged to the claw, and the other end is hinged to the push rod. The push rod is fixed to the sliding tooth seat, and the sliding tooth seat is slidably mounted on the hinge seat. The drive screw drives the sliding tooth seat to slide via a gear and rack meshing mechanism, thereby causing the two claws to open or close via the push rod and the hinge rod, so as to achieve engagement or disengagement with the guide rod.

[0012] Furthermore, the guide rod is provided with a guide key extending axially, and the lower end of the guide key is provided with a snap-fit ​​tooth; the inner wall of the bidirectional screw sleeve is provided with a keyway that slides with the guide key; the shape of the snap-fit ​​claw end matches the snap-fit ​​tooth to achieve snap-fit ​​fixation.

[0013] Furthermore, the driving rotor is mounted on one side of the hinge seat via a rod seat, and a limiting screw is screwed onto the rod seat. The upper end of the limiting screw can abut against the abutting plane of the driving rotor to lock the rotation of the driving rotor.

[0014] Furthermore, it also includes a transmission mechanism, which includes a bevel gear set, a transmission gear, and a transmission rack; the bevel gear set is connected to the lower end of the guide rod, the transmission gear is connected to the bevel gear set, and the transmission rack can selectively mesh with the transmission gear; the transmission rack is slidably mounted on the electrical cabinet body and is provided with a stop bar that can abut against the rear end of the chassis vehicle, and the transmission rack is driven by a spring to return to its original position.

[0015] According to another aspect of the present invention, a low-voltage switchgear is also provided, comprising: The electrical cabinet body has a central compartment; a chassis trolley is disposed in the central compartment and can be pushed in or pulled out; a guide rail assembly is installed on both sides of the central compartment for guiding the chassis trolley; and an adjustable door mechanism as described above, the door mechanism is installed at the rear end of the guide rail assembly and is connected to the chassis trolley through a transmission mechanism; when the chassis trolley is pushed in or pulled out, the guide rod is driven to rotate through the transmission mechanism, thereby controlling the opening or closing of the door panel.

[0016] Furthermore, the transmission mechanism includes a bevel gear set, a transmission gear, and a transmission rack; the bevel gear set is connected to the lower end of the guide rod, the transmission gear is driven by the bevel gear set, and the transmission rack is slidably mounted on the guide rail assembly; the transmission rack is provided with a stop rod, which can abut against the rear end of the chassis vehicle; when the chassis vehicle is pushed in, it pushes the transmission rack to mesh with the transmission gear and drives it to rotate, thereby driving the guide rod to rotate, causing the two valve plates to move towards each other and open; when the chassis vehicle is pulled out, the transmission rack is reset under the action of a spring and drives the transmission gear to rotate in the opposite direction, causing the two valve plates to move away from each other and close.

[0017] Furthermore, the guide rail assembly includes a mounting bracket fixed to the side wall of the central chamber and a chassis guide rail fixed to the mounting bracket; the guide rod of the adjustable valve mechanism is rotatably mounted on the mounting bracket.

[0018] Furthermore, the guide sleeve is provided with a lubricating bushing made of wear-resistant self-lubricating material.

[0019] Beneficial effects: 1. The gap between the valve plates of this invention is bidirectionally adjustable, adapting to electrical cabinets of different specifications. This invention drives a guide rod to rotate via a transmission mechanism, which in turn drives the corresponding bidirectional screw sleeve to rotate. Because the helical segments at both ends of the bidirectional screw sleeve rotate in opposite directions, the two valve plates are threaded into the helical segments at both ends, allowing the two valve plates to move towards or away from each other when the bidirectional screw sleeve rotates. Operators can easily and precisely adjust the gap between the two valve plates by simply rotating any bevel gear set or guide rod, matching it to the vertical spacing of the contact boxes in electrical cabinets of different specifications. This design completely changes the shortcomings of traditional valve mechanisms, which have fixed gaps and require custom-made cabinets, significantly improving the versatility and applicability of the valve mechanism.

[0020] 2. The overall height of the valve panel is adjustable, allowing for flexible installation and positioning. This invention utilizes a claw assembly to achieve sliding adjustment of the two bidirectional screw sleeves along the guide rod height. When adjusting the overall height of the valve panel, first rotate the limiting screw to separate it from the drive rod, releasing the limiting lock; then rotate the drive rod, which drives the sliding tooth seat to slide via the drive gear. The sliding tooth seat pushes the push rod and hinge rod, causing the two locking claws to rotate and open. After opening, the locking claws disengage from the locking teeth of the guide key, allowing the entire claw assembly and bidirectional screw sleeve to slide up and down along the guide rod, adjusting the two valve panels to the height corresponding to the contact box position. After adjustment, rotate the drive rod in the opposite direction to close the locking claws, then tighten the limiting screw to lock the drive rod, reliably fixing the position of the bidirectional screw sleeve. This height adjustment function allows the invention to flexibly adapt to different installation heights of contact boxes in different electrical cabinets, further expanding the applicability of the valve mechanism.

[0021] 3. The threaded transmission between the guide rod and the double-ended screw sleeve ensures high transmission accuracy, reliable operation, and no jamming. This invention abandons the traditional linkage transmission method of the valve mechanism, adopting a threaded transmission between the guide rod and the double-ended screw sleeve. Its transmission path is simple and direct, without redundant hinge points or transmission backlash, effectively avoiding problems such as asynchronous operation, lateral tilting, and jamming caused by hinge wear in traditional linkage mechanisms. Simultaneously, the guide rod and the double-ended screw sleeve slide together via a guide key and keyway, ensuring the smoothness and guiding accuracy of the double-ended screw sleeve's axial movement along the guide rod, thus making the opening and closing of the valve plate more precise and reliable.

[0022] 4. This invention features both automatic and manual dual-mode drive, offering convenient operation. When the chassis is withdrawn, the spring pushes the transmission rack away from the transmission gear, disengaging the transmission gear from the rack. Operators can then manually adjust the gap between the valve plates by rotating any bevel gear set or guide rod, providing flexible and convenient operation. When the chassis is pushed in, the rear end of the chassis pushes the stop rod, which moves the transmission rack against the spring force and engages with the transmission gear. The transmission gear drives the bevel gear set, which in turn rotates the guide rod. The guide rod rotates the bidirectional screw sleeve, causing the two valve plates to move towards each other, automatically opening the contact box. Conversely, when the chassis is withdrawn, the transmission rack resets under the spring's action, and the valve plates automatically close. This design organically combines automatic drive and manual adjustment for valve opening and closing, ensuring automated operation under normal working conditions while providing convenience for manual adjustment during installation, commissioning, and maintenance.

[0023] 5. No spring reset required, high safety and reliability. The opening and closing of the valve plate in this invention is directly driven by the threaded transmission of the guide rod and the bidirectional screw sleeve, without relying on the elastic potential energy of the spring for reset. The opening and closing of the valve plate are precisely controlled by the forward and reverse rotation of the transmission mechanism, eliminating the safety hazard of traditional valve mechanisms that cannot be fully closed due to spring fatigue failure, greatly improving the safety and reliability of equipment operation.

[0024] 6. Compact structure, no interference risk. The transmission mechanism of this invention adopts a compact layout of bevel gear set, transmission rack and transmission gear, avoiding the problem of interference between the longitudinal transmission rod and the fixing screw cap of the stationary contact box mounting plate in traditional valve mechanisms. The structure is reasonably designed and easy to install and maintain. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of the low-voltage switchgear of the present invention; Figure 2 This is a three-dimensional structural diagram of the valve mechanism of the present invention. Figure 1 ; Figure 3This is a three-dimensional structural diagram of the valve mechanism of the present invention. Figure 2 ; Figure 4 This is a three-dimensional structural diagram of the valve mechanism of the present invention. Figure 3 ; Figure 5 This is a three-dimensional structural diagram of the valve mechanism of the present invention. Figure 4 ; Figure 6 This is a three-dimensional structural diagram of the claw assembly of the present invention.

[0026] The labels in the diagram are as follows: 1-Electrical cabinet body; 11-Central compartment; 2-Chassis; 3-Guide rail assembly; 31-Chassis guide rail; 32-Mounting bracket; 4-Adjustable door mechanism; 41-Door panel; 42-Guide rod; 43-Double-direction screw sleeve; 431-Spiral section; 432-Keyway; 44-Guide sleeve; 45-Guide key; 451-Snap-fit ​​tooth; 46-Claw assembly; 461-Snap-fit ​​claw. 462-Hinged rod; 463-Hinged seat; 464-Connecting seat; 465-Push rod; 466-Sliding gear seat; 467-Drive rotating rod; 4671-Abutting surface; 468-Rod seat; 469-Limiting screw; 4610-Drive gear; 5-Transmission mechanism; 51-Bevel gear set; 52-Transmission rack; 53-Transmission gear; 54-Sliding guide rod; 55-Spring; 56-Abutting rod. Detailed Implementation

[0027] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0028] Example 1 like Figures 1 to 6 As shown, this embodiment provides an adjustable door mechanism and a low-voltage switchgear, including an electrical cabinet body 1, a chassis 2, a guide rail assembly 3, and an adjustable door mechanism 4.

[0029] The electrical cabinet body 1 has a central control compartment 11 inside, and guide rail assemblies 3 are installed on both side walls of the central control compartment 11. The guide rail assembly 3 includes a chassis guide rail 31 and a mounting bracket 32. The chassis guide rail 31 is fixed to the mounting bracket 32, and the mounting bracket 32 ​​is fixedly installed on both side walls of the central control compartment 11. The chassis 2 is slidably installed in the central control compartment 11 via the chassis guide rail 31, and a circuit breaker (not shown in the figure) is installed on the chassis 2. An adjustable valve mechanism 4 is installed at the rear end of the mounting bracket 32, that is, at the rear of the central control compartment 11, corresponding to the position of the stationary contact box inside the electrical cabinet body 1.

[0030] The adjustable valve mechanism 4 includes two valve plates 41, two guide rods 42, and two bidirectional screw sleeves 43. The two guide rods 42 are rotatably mounted on the mounting brackets 32 of the guide rail assemblies 3 on both sides, respectively. The guide rods 42 are vertically arranged, and their lower ends are connected to the transmission mechanism 5. The bidirectional screw sleeves 43 are sleeved on the corresponding guide rods 42, and there is a sliding connection between the bidirectional screw sleeves 43 and the guide rods 42, meaning the bidirectional screw sleeves 43 can slide along the axial direction of the guide rods 42. A keyway 432 is provided on the inner side of the bidirectional screw sleeves 43, and a guide key 45 is fixedly provided on the guide rods 42. The guide key 45 slides in conjunction with the keyway 432, allowing the bidirectional screw sleeves 43 to slide along the axial direction of the guide rods 42. Simultaneously, when the guide rods 42 rotate, the guide key 45 drives the bidirectional screw sleeves 43 to rotate synchronously through the keyway 432.

[0031] The outer wall of the bidirectional screw sleeve 43 has two helical sections 431, located at the upper and lower ends of the bidirectional screw sleeve 43 respectively, with opposite rotation directions (one left-handed and the other right-handed). Two valve plates 41 are installed between the two bidirectional screw sleeves 43 via guide sleeves 44. Specifically, both ends of each valve plate 41 are connected to the two bidirectional screw sleeves 43 on both sides via guide sleeves 44. The guide sleeves 44 are slidably fitted onto the guide rod 42, and simultaneously threadedly engage with the helical sections 431 of the bidirectional screw sleeve 43. Since the two helical sections 431 rotate in opposite directions, when the bidirectional screw sleeve 43 rotates, the two guide sleeves 44 (i.e., the two valve plates 41) move towards each other or away from each other along the guide rod 42, thereby adjusting the distance between the two valve plates 41.

[0032] A claw assembly 46 is installed at the lower end of the bidirectional screw sleeve 43. The claw assembly 46 includes two locking claws 461, two hinge rods 462, and a hinge seat 463. The hinge seat 463 is fixedly connected to the lower end of the bidirectional screw sleeve 43 via a connecting seat 464. The upper ends of the two locking claws 461 are hinged to the hinge seat 463, and the middle of each locking claw 461 is connected to the hinge seat 463 via a hinge rod 462. One end of the hinge rod 462 is hinged to the middle of the corresponding locking claw 461, and the other end of the hinge rod 462 is connected to the hinge seat 463 via a push rod 465 and is hinged to the push rod 465. The push rod 465 is fixed to the sliding tooth seat 466, and the sliding tooth seat 466 is slidably mounted on the hinge seat 463. A drive rod 467 is provided on one side of the hinge base 463. The drive rod 467 is rotatably mounted on one side of the hinge base 463 via a rod seat 468. A limit screw 469 is provided below the drive rod 467. The limit screw 469 is screwed onto the rod seat 468, and the upper end of the limit screw 469 can abut against the abutment plane 4671 of the drive rod 467. The drive rod 467 and the sliding gear seat 466 are driven by a drive gear 4610. Specifically, the sliding gear seat 466 is provided with a rack segment, and the drive gear 4610 meshes with the rack segment.

[0033] A guide key 45 is provided on the guide rod 42, extending axially along the guide rod 42. A locking tooth 451 is provided at the lower end of the guide key 45, extending axially along the lower end of the guide key 45. The shape of the claw tip of the locking claw 461 matches the tooth shape of the locking tooth 451. When the two locking claws 461 are closed, the claw tip of the locking claw 461 engages with the locking tooth 451, thus securing the claw assembly 46 to the guide rod 42. When the two locking claws 461 are open, the claw tip of the locking claw 461 disengages from the locking tooth 451, allowing the claw assembly 46 to slide axially along the guide rod 42.

[0034] The transmission mechanism 5 is mounted on the mounting bracket 32 ​​of the two side guide rail assemblies 3. The transmission mechanism 5 includes a bevel gear set 51, a transmission rack 52, and a transmission gear 53. The bevel gear set 51 includes two meshing bevel gears, one of which is fixedly connected to the lower end of the corresponding guide rod 42, and the other bevel gear is coaxially fixedly connected to the transmission gear 53. The transmission gear 53 is rotatably mounted on one side of the mounting bracket 32. The transmission rack 52 is slidably mounted on the mounting bracket 32, and the transmission rack 52 and the transmission gear 53 can mesh and transmit power. The transmission rack 52 and the mounting bracket 32 ​​are slidably connected by a sliding guide rod 54, which is fixed to the mounting bracket 32. The transmission rack 52 is sleeved on the sliding guide rod 54 and can slide along the sliding guide rod 54. A spring 55 is sleeved on the sliding guide rod 54, with one end of the spring 55 abutting against the transmission rack 52 and the other end abutting against the mounting bracket 32. A stop rod 56 is fixedly installed on the transmission rack 52. The stop rod 56 extends forward of the central chamber 11 and can abut against the rear end of the chassis vehicle 2.

[0035] The working principle of this embodiment is as follows: (a) Adjustment of the gap between the door panels When the chassis 2 is pulled out of the electrical cabinet body 1, the spring 55 pushes the transmission rack 52 away from the transmission gear 53, at which point the transmission rack 52 and transmission gear 53 disengage. The operator can manually rotate either side of the bevel gear set 51 or directly rotate the upper end of the guide rod 42. When the guide rod 42 rotates, the guide key 45, in conjunction with the keyway 432, drives the bidirectional screw sleeve 43 to rotate synchronously. As the bidirectional screw sleeve 43 rotates, the two helical sections 431 with opposite directions of rotation drive the two guide sleeves 44 to move towards or away from each other along the guide rod 42, thereby causing the two valve plates 41 to move towards or away from each other. The operator can adjust the two valve plates 41 to a suitable distance according to the actual vertical distance of the contact boxes inside the electrical cabinet and then stop rotating.

[0036] (ii) Adjustment of the overall height of the trapdoor panel When it is necessary to adjust the overall height of the two valve plates 41 to match the installation height of the contact box, first rotate the limiting screw 469 so that the upper end of the limiting screw 469 moves downward and disengages from the abutment plane 4671 of the drive rotating rod 467, thus releasing the rotation limit on the drive rotating rod 467. Then rotate the drive rotating rod 467, which drives the sliding tooth seat 466 to slide through the drive gear 4610. The sliding tooth seat 466 pushes the push rod 465 to move, and the push rod 465 pushes the hinge rod 462 to swing. The hinge rod 462 drives the two locking claws 461 to rotate and open around their upper hinge points. After the two locking claws 461 open, the claw ends of the locking claws 461 disengage from the locking teeth 451 at the lower end of the guide key 45. At this time, the operator can push the entire locking claw assembly 46 and the bidirectional screw sleeve 43 to slide up and down along the guide rod 42 to adjust the two valve plates 41 to the height corresponding to the position of the contact box. After adjustment, rotate the drive rod 467 in the opposite direction to close the two locking claws 461. The claw ends of the locking claws 461 re-engage with the locking teeth 451. Then rotate the limiting screw 469 in the opposite direction to make the upper end of the limiting screw 469 abut against the abutting surface 4671 of the drive rod 467, locking the drive rod 467 and completing the height adjustment.

[0037] (iii) Automatic opening and closing of the trapdoor panel When chassis 2 is pushed into the central chamber 11, the rear end of chassis 2 abuts against the abutment rod 56 and pushes the abutment rod 56 backward. The abutment rod 56 drives the transmission rack 52 to slide along the sliding guide rod 54, compressing the spring 55. After the transmission rack 52 moves to the position of meshing with the transmission gear 53, it continues to move, driving the transmission gear 53 to rotate. The transmission gear 53 drives the guide rod 42 to rotate through the bevel gear set 51. The guide rod 42 drives the double-acting screw sleeve 43 to rotate. The double-acting screw sleeve 43 drives the two valve plates 41 to move towards each other (closer to each other), thereby opening the contact box and reliably engaging the moving contact on chassis 2 with the stationary contact box.

[0038] When chassis 2 is pulled out of the central chamber 11, the rear end of chassis 2 disengages from the abutment rod 56. Spring 55 releases its elastic potential energy, pushing the transmission rack 52 to slide back to its original position along the sliding guide rod 54. When the transmission rack 52 moves in the reverse direction, it drives the transmission gear 53 to reverse. The transmission gear 53 drives the guide rod 42 to reverse through the bevel gear set 51. The guide rod 42 drives the bidirectional screw sleeve 43 to reverse. The bidirectional screw sleeve 43 drives the two valve plates 41 to move away from each other, thereby closing the contact box, isolating the stationary contact box, and ensuring the safety of the operator.

[0039] Example 2 This embodiment further optimizes the guide structure of the valve plate 41. A lubrication bushing (not shown in the figure) is provided on the inner wall of the guide sleeve 44. The lubrication bushing is made of a wear-resistant, self-lubricating material, such as polytetrafluoroethylene (PTFE) or copper-based powder metallurgy material. The lubrication bushing is fitted onto the guide rod 42. When the guide sleeve 44 slides along the guide rod 42, the lubrication bushing effectively reduces frictional resistance, improves the smoothness of the valve plate 41's movement, and simultaneously reduces wear and noise.

[0040] In addition, the surface of the guide rod 42 is hardened or plated with hard chrome to improve the surface hardness and wear resistance of the guide rod 42 and extend its service life.

[0041] Example 3 This embodiment further optimizes the limiting structure of the claw assembly 46. An elastic washer (not shown in the figure) is provided at the upper end of the limiting screw 469. The elastic washer is made of rubber or polyurethane material. When the upper end of the limiting screw 469 abuts against the abutting plane 4671 of the drive rotor 467, the elastic washer undergoes elastic deformation, generating a preload force. This more reliably locks the drive rotor 467 and prevents it from rotating unexpectedly under vibration.

[0042] Meanwhile, the end of the drive lever 467 is equipped with an operating handle, and the outer surface of the operating handle is provided with anti-slip patterns to facilitate the staff to hold and rotate the drive lever 467.

[0043] Example 4 This embodiment further optimizes the transmission mechanism 5. A protective cover (not shown in the figure) is provided at the meshing part of the transmission rack 52 and the transmission gear 53. The protective cover is fixedly installed on the mounting bracket 32 ​​to cover the meshing area of ​​the transmission rack 52 and the transmission gear 53, preventing external debris from entering the meshing area and affecting the transmission accuracy and reliability.

[0044] Spring 55 is a compression spring, with spring seats (not shown in the figure) at both ends. The spring seats abut against the transmission rack 52 and the mounting bracket 32, respectively. The spring seats ensure that the spring 55 is subjected to uniform force and prevent the spring 55 from tilting or twisting during compression and reset.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications should fall within the scope of the invention as claimed. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An adjustable door mechanism for installation in an electrical cabinet body, characterized in that, include: Two hinged door panels (41); two guide rods (42), respectively vertically and rotatably disposed on both sides of the electrical cabinet body; two bidirectional screw sleeves (43), respectively sleeved on the corresponding guide rods (42), each bidirectional screw sleeve (43) having two helical sections (431) with opposite directions of rotation on its outer wall; the two hinged door panels (41) are respectively threadedly engaged with the helical sections (431) of the two bidirectional screw sleeves (43) through guide sleeves (44), so that when the bidirectional screw sleeves (43) rotate, the two hinged door panels (41) can be positioned on the guide rods (42). Guided by the guide rod (42), the two-way screw sleeve (43) moves synchronously closer to or further away from the guide rod (42); and the claw assembly (46) is installed at the lower end of the bidirectional screw sleeve (43) and can engage or disengage from the guide rod (42); when the claw assembly (46) disengages from the guide rod (42), the bidirectional screw sleeve (43) can drive the valve plate (41) to slide axially along the guide rod (42) to adjust the overall height of the valve plate (41); when the claw assembly (46) engages with the guide rod (42), the axial position of the bidirectional screw sleeve (43) and the guide rod (42) is relatively fixed.

2. The adjustable valve mechanism according to claim 1, characterized in that, The jaw assembly (46) includes a hinge seat (463), two jaws (461), two hinge rods (462), a push rod (465), a sliding tooth seat (466), and a drive screw (467); the hinge seat (463) is connected to the lower end of the bidirectional screw sleeve (43), the upper ends of the two jaws (461) are hinged to the hinge seat (463), and the middle parts of the two jaws (461) are respectively connected to the hinge seat (463) through a hinge rod (462); the hinge rod (462) One end is hinged to the locking claw (461), and the other end is hinged to the push rod (465); the push rod (465) is fixed on the sliding tooth seat (466), and the sliding tooth seat (466) is slidably mounted on the hinge seat (463); the drive rotor (467) drives the sliding tooth seat (466) to slide through the gear and rack meshing method, and then drives the two locking claws (461) to open or close through the push rod (465) and the hinge rod (462) to achieve locking or disengagement with the guide rod (42).

3. The adjustable valve mechanism according to claim 2, characterized in that, The guide rod (42) is provided with a guide key (45) extending axially, and the lower end of the guide key (45) is provided with a snap-fit ​​tooth (451); the inner wall of the bidirectional screw sleeve (43) is provided with a keyway (432) that slides with the guide key (45); the shape of the claw end of the snap-fit ​​claw (461) matches the snap-fit ​​tooth (451) to achieve snap-fit ​​fixation.

4. The adjustable valve mechanism according to claim 2, characterized in that, The drive rotor (467) is mounted on one side of the hinge seat (463) via a rod seat (468), and a limiting screw (469) is screwed onto the rod seat (468). The upper end of the limiting screw (469) can abut against the abutting plane (4671) of the drive rotor (467) to lock the rotation of the drive rotor (467).

5. The adjustable valve mechanism according to claim 1, characterized in that, It also includes a transmission mechanism (5), which includes a bevel gear set (51), a transmission gear (53), and a transmission rack (52); the bevel gear set (51) is connected to the lower end of the guide rod (42), the transmission gear (53) is connected to the bevel gear set (51) in a transmission manner, and the transmission rack (52) can selectively mesh with the transmission gear (53); the transmission rack (52) is slidably mounted on the electrical cabinet body and is provided with a stop rod (56) that can abut against the rear end of the chassis vehicle, and the transmission rack (52) is driven to reset by a spring (55).

6. A low-voltage switchgear, characterized in that, include: The electrical cabinet body (1) has a central compartment (11); a chassis (2) is disposed in the central compartment (11) in a way that can be pushed in or pulled out; a guide rail assembly (3) is installed on both sides of the central compartment (11) for guiding the chassis (2); and an adjustable door mechanism (4) as described in any one of claims 1 to 5, wherein the door mechanism (4) is installed at the rear end of the guide rail assembly (3) and is connected to the chassis (2) through a transmission mechanism (5); when the chassis (2) is pushed in or pulled out, the guide rod (42) is driven to rotate through the transmission mechanism (5), thereby controlling the opening or closing of the door panel (41).

7. The low-voltage switchgear according to claim 6, characterized in that, The transmission mechanism (5) includes a bevel gear set (51), a transmission gear (53), and a transmission rack (52); the bevel gear set (51) is connected to the lower end of the guide rod (42), the transmission gear (53) is connected to the bevel gear set (51) in a transmission manner, and the transmission rack (52) is slidably mounted on the guide rail set (3); the transmission rack (52) is provided with a stop rod (56), and the stop rod (56) can abut against the rear end of the chassis (2); when the chassis (2) is pushed in, it pushes the transmission rack (52) to mesh with the transmission gear (53) and drives it to rotate, thereby driving the guide rod (42) to rotate, so that the two valve plates (41) move towards each other and open; when the chassis (2) is pulled out, the transmission rack (52) is reset under the action of the spring (55) and drives the transmission gear (53) to rotate in the opposite direction, so that the two valve plates (41) move away from each other and close.

8. The low-voltage switchgear according to claim 6, characterized in that, The guide rail assembly (3) includes a mounting bracket (32) fixed to the side wall of the central chamber (11) and a chassis guide rail (31) fixed to the mounting bracket (32); the guide rod (42) of the adjustable valve mechanism (4) is rotatably mounted on the mounting bracket (32).

9. The low-voltage switchgear according to claim 6, characterized in that, The guide sleeve (44) is provided with a lubricating bushing made of wear-resistant self-lubricating material.

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