Electric operating mechanism for chassis truck

Abstract

The present invention belongs to the technical field of the application of power switch cabinets, and specifically discloses an electric operating mechanism for a chassis truck, which is composed of a housing arranged on the outer wall of the middle part of a middle-mounted switch cabinet body and a driving component arranged in the housing. The beneficial effects of the electric operating mechanism for the chassis truck of the present invention are as follows: 1. Its design structure is reasonable, realizing two control methods for the chassis truck of the middle-mounted switch cabinet. At the same time, the switching between the two control methods (electric or manual) is convenient, and the rotation control is accurate and stable; 2. The overall structure is installed on the outer wall of the middle-mounted switch cabinet, which does not affect the layout structure of the internal power components and eliminates the generation of potential safety hazards; 3. The overall structure is installed on the outer wall of the middle-mounted switch cabinet, which is also convenient for inspection and maintenance, with low manufacturing cost, convenient installation, time-saving and labor-saving; 4. It solves the problems that the existing structure is used in cooperation with a manual rotary control handle and a limit joint, and is prone to problems such as wear and fracture.

Description

Technical Field

[0001] The present invention belongs to the technical field of the application of power switch cabinets, and particularly relates to an electric operating mechanism for a chassis truck, which is used for accurately, stably, conveniently and efficiently controlling a chassis truck of a medium-mounted switch cabinet, and improving the overhaul and maintenance efficiency. Background Art

[0002] A switch cabinet is an electrical device. The external lines of the switch cabinet first enter the main control switch inside the cabinet, and then enter the sub-control switches. Each branch is set as required. Such as instruments, automatic controls, motor magnetic switches, various AC contactors, etc. Some also have high-voltage and low-voltage switch cabinets, with high-voltage busbars, such as power plants, etc. Some also have low-frequency load shedding to protect the main equipment.

[0003] The main function of a switchgear is to switch, control and protect electrical equipment during the processes of power generation, power transmission, power distribution and power conversion in a power system. The components inside the switchgear mainly include a circuit breaker, a disconnector, a load switch, an operating mechanism, an instrument transformer and various protection devices, etc.

[0004] A medium-mounted switch cabinet, full name: metal-clad medium-mounted withdrawable switchgear, belongs to high-voltage distribution equipment, with a maximum operating voltage of 3.6 / 7.2 / 12 / 40.5 kV, which is an indoor complete set of distribution equipment for a three-phase AC 50 Hz single-busbar sectional system or double-busbar sectional system, used for receiving and distributing network electric energy of 3.6 - 40.5 kV, and for controlling, protecting, monitoring and measuring power circuits. Medium-mounted switch cabinets are mainly used in power plants, for sending electricity from small and medium-sized generators, receiving and sending electricity in secondary substations of the power system, power distribution in industrial and mining enterprises and institutions, and starting large high-voltage motors, etc.

[0005] The chassis truck is the withdrawable part of a medium-mounted switch cabinet. The main electrical components inside the switch cabinet are installed on it. The chassis truck (draw-out trolley) is the main component of a withdrawable switch cabinet, generally having two types: a PT trolley and a switch (circuit breaker) trolley. The trolley is also called a small car. Taking the switch trolley as an example, in the case of the switch being opened, after laying the guide rails, it can be pulled out of the switch cabinet by hand for overhaul or replacement. The existing improvement is to change the manual drive to an electric drive, that is, to change the handle rotation drive to a motor rotation drive. However, the existing drawback is that the entire drive component is installed inside the medium-mounted switch cabinet. On the one hand, it is inconvenient to install, affecting the internal layout structure of the medium-mounted switch cabinet and posing a safety hazard. On the other hand, it is inconvenient to overhaul and has a high cost. At the same time, the limit joint used in cooperation with the manual rotation control handle is of a circular structure, etc. After long-term use, the manual rotation control handle will cause the limit joint to break and wear, becoming thinner and thinner and prone to fracture, and there are also problems such as slipping after wear, and it is impossible to achieve manual control (rotating the transmission square shaft of the chassis truck) in special situations.

[0006] Therefore, based on the above problems, the present invention provides an electric operating mechanism for a chassis truck. Summary of the Invention

[0007] Object of the Invention: The object of the present invention is to provide an electric operating mechanism for a chassis truck, whose design structure is reasonable, realizing two control modes of a medium-mounted switch cabinet chassis truck. At the same time, the switching between the two control modes (electric or manual) is convenient, the rotation control is accurate and stable, and the problems of easy wear and fracture of the existing structure when cooperating with a manual rotation control handle and a limit joint are solved.

[0008] Technical Solution: The electric operating mechanism for a chassis truck provided by the present invention is composed of a housing arranged on the outer wall of the middle part of a medium-mounted switch cabinet body and a driving component arranged in the housing; the driving component includes a motor mounting plate and a rear mounting plate arranged at one end of the housing, a motor arranged at the other end of the housing, an output gear arranged on the upper surface of the motor mounting plate and connected to the motor, a worm whose two ends are respectively connected to the motor mounting plate and the rear mounting plate, a transmission spur gear arranged at one end of the worm and cooperating with the output gear, a worm wheel arranged between the motor mounting plate and the rear mounting plate and below the worm, a driving member arranged on the inner wall of the worm wheel, two circular limit rings symmetrically arranged on the inner wall of one end of the driving member, two groups of limit slots symmetrically arranged on the circular limit rings, a driven member cooperating with the driving member, a group of limit protrusions arranged on the outer wall of one end of the driven member, and a square protrusion for external handle operation and a concave block for connecting the square shaft of the switch cabinet respectively arranged at both ends of the driven member.

[0009] In this technical solution, the electric operating mechanism for a chassis truck further includes a plurality of positioning threaded holes arranged in the housing and cooperating with the medium-mounted switch cabinet body. Among them, a through groove cooperating with the concave block for connecting the square shaft of the switch cabinet is arranged in the outer wall of the middle part of the medium-mounted switch cabinet body, and a through groove cooperating with the square protrusion for external handle operation is arranged in the outer wall of the housing.

[0010] In this technical solution, the electric operating mechanism for a chassis truck further includes a plurality of motor mounting plate positioning threaded holes and a plurality of rear mounting plate positioning threaded holes respectively arranged on the motor mounting plate and the rear mounting plate.

[0011] In this technical solution, the motor is a DC motor.

[0012] In this technical solution, the driving member is arranged as a circular hollow structure, the two groups of limit slots are arranged as arc-shaped structures, the driven member is arranged as a cylindrical structure, and a group of limit protrusions are arranged as arc-shaped structures. Among them, the two groups of limit slots are respectively larger than the size of a group of limit protrusions.

[0013] For the technical solution of this invention, the electric operating mechanism of the chassis truck further includes a front steel sleeve and a rear steel sleeve arranged on both sides of the worm gear, a plain bearing arranged on the driven member and on one side of the rear steel sleeve, a spring limit ring arranged at one end of the driven member and on one side of the concave block for connecting the square shaft of the switch cabinet, and a compression spring arranged on the driven member. Among them, the plain bearing is installed on the spring limit ring, and both ends of the compression spring are respectively connected to the end face of the spring limit ring and the end face of the driving member. An installation groove for the compression spring is arranged at one end of the driving member.

[0014] For the technical solution of this invention, the diameters of the concave block for connecting the square shaft of the switch cabinet, the driven member, and the spring limit ring decrease in sequence.

[0015] For the technical solution of this invention, the electric operating mechanism of the chassis truck further includes a through hole of the driving member arranged inside the driving member. Among them, the driving member and the worm gear are firmly connected through the through hole of the driving member by a positioning screw.

[0016] For the technical solution of this invention, the electric operating mechanism of the chassis truck further includes shafts respectively arranged on the end faces of the upper side walls of the motor mounting plate and the rear mounting plate and respectively cooperating with the worm.

[0017] For the technical solution of this invention, the motor mounting plate and the rear mounting plate are respectively arranged as strip plate structures.

[0018] Compared with the prior art, the beneficial effects of the electric operating mechanism of the chassis truck of the present invention are as follows: 1. Its design structure is reasonable, realizing two control methods for the chassis truck of the medium-mounted switch cabinet. At the same time, the switching between the two control methods (electric or manual) is convenient, and the rotation control is accurate and stable; 2. The overall structure is installed on the outer wall of the medium-mounted switch cabinet, which does not affect the layout structure of the internal power components and eliminates the generation of potential safety hazards; 3. The overall structure installed on the outer wall of the medium-mounted switch cabinet is also convenient for inspection and maintenance, with low manufacturing cost, convenient installation, and time-saving and labor-saving; 4. It solves the problems that the existing structure is used in cooperation with the manual rotation control handle and the limit joint is prone to wear, fracture, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the housing, etc. of the electric operating mechanism of the chassis truck of the present invention;

[0020] Figure 2 It is a rear view structural schematic diagram of the housing, etc. of the electric operating mechanism of the chassis truck of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the electric operating mechanism of the chassis truck of the present invention installed on the medium-mounted switch cabinet body;

[0022] Figure 4 It is a front view partial structural schematic diagram of the driving component, etc. of the electric operating mechanism of the chassis truck of the present invention;

[0023] Figure 5 It is a schematic rear view structure diagram of the driving component and the like of the electric operating mechanism of the chassis vehicle of the present invention;

[0024] Figure 6 It is a schematic front view structure diagram of the driving member, worm gear, driven member and the like of the electric operating mechanism of the chassis vehicle of the present invention;

[0025] Figure 7 It is a schematic vertical view structure diagram of the driving member, worm gear, front steel sleeve and the like of the electric operating mechanism of the chassis vehicle of the present invention;

[0026] Figure 8 and Figure 9 It is a schematic vertical view structure diagram of the driving member, worm gear, rear steel sleeve, planar rotating shaft and the like of the electric operating mechanism of the chassis vehicle of the present invention;

[0027] Figure 10 It is a schematic front view structure diagram of the driving member, circular limit ring, two groups of limit card slots, driven member and the like of the electric operating mechanism of the chassis vehicle of the present invention;

[0028] Figure 11 、 Figure 12 、 Figure 13 It is a schematic vertical view structure diagram of the driving member, spring limit ring, compression spring and the like of the electric operating mechanism of the chassis vehicle of the present invention. Detailed implementation manners

[0029] The present invention will be further clarified below in conjunction with the accompanying drawings and specific embodiments.

[0030] As Figures 1 to 13 shown, the electric operating mechanism of the chassis vehicle includes a housing 1 provided on the outer wall of the middle part of the medium-mounted switch cabinet body, and a driving component provided in the housing 1; the driving component includes a motor mounting plate 5 and a rear mounting plate 6 provided at one end of the housing 1, a motor 4 provided at the other end of the housing 1, an outlet gear 7 provided on one side of the upper part of the motor mounting plate 5 and connected to the motor 4, a worm 9 with both ends respectively connected to the motor mounting plate 5 and the rear mounting plate 6, a transmission spur gear 8 provided at one end of the worm 9 and cooperating with the outlet gear 7, a worm gear 10 provided between the motor mounting plate 5 and the rear mounting plate 6 and below the worm 9, a driving member 14 provided on the inner wall of the worm gear 10, a circular limit ring 23 symmetrically provided on the inner wall of one end of the driving member 14, two groups of limit card slots 24 symmetrically provided on the circular limit ring 23, a driven member 15 cooperating with the driving member 14, a group of limit protrusions 22 provided on the outer wall of one end of the driven member 15, and a square protrusion 2 for external handle operation of the switch cabinet and a concave block 3 for connection with the square shaft of the switch cabinet respectively provided at both ends of the driven member 15.

[0031] Further preferably, the electric operating mechanism of the chassis truck further includes a plurality of positioning threaded holes 25 disposed in the housing 1 and used in cooperation with the medium-mounted switch cabinet body. Among them, a through groove used in cooperation with the concave block 3 connected to the switch cabinet square shaft is provided in the middle outer wall of the medium-mounted switch cabinet body, and a through groove used in cooperation with the square convex block 2 for operating the handle outside the cabinet is provided in the outer wall of the housing 1; and the electric operating mechanism of the chassis truck further includes a plurality of motor mounting plate positioning threaded holes 11 and a plurality of rear mounting plate positioning threaded holes 12 respectively disposed on the motor mounting plate 5 and the rear mounting plate 6; and the motor 4 is a DC motor; and the driving member 14 is provided with a circular hollow structure, the two groups of limit card slots 24 are provided with an arc structure, the driven member 15 is provided with a cylindrical structure, and one group of limit convex blocks 22 is provided with an arc structure. Among them, the two groups of limit card slots 24 are respectively larger than the size of one group of limit convex blocks 22; and the electric operating mechanism of the chassis truck further includes a front steel sleeve 17 and a rear steel sleeve 18 disposed on both sides of the worm gear 10, and a plain bearing 19 disposed on the driven member 15 and on one side of the rear steel sleeve 18, and a spring limit ring 20 disposed at one end of the driven member 15 and on one side of the concave block 3 connected to the switch cabinet square shaft, and a compression spring 21 disposed on the driven member 15. Among them, the plain bearing 19 is mounted on the spring limit ring 20, and the two ends of the compression spring 21 are respectively connected to the end face of the spring limit ring 20 and the end face of the driving member 14. An installation groove for the compression spring 21 is provided at one end of the driving member 14 (see Figure 11 , Figure 12 , Figure 13 . The grooves are not marked in the figures); and the diameters of the concave block 3 connected to the switch cabinet square shaft, the driven member 15, and the spring limit ring 20 decrease in sequence; and the electric operating mechanism of the chassis truck further includes a through hole 16 of the driving member disposed in the driving member 14. Among them, the driving member 14 and the worm gear 10 are tightly connected by a positioning screw through the through hole 16 of the driving member (the positioning screw and the threaded hole of the worm gear 10 Figure 6 are not marked in the figures); and the electric operating mechanism of the chassis truck further includes bearings 13 respectively disposed on the upper side wall end faces of the motor mounting plate 5 and the rear mounting plate 6 and used in cooperation with the worm 9 (among them, the bearing 13 in the motor mounting plate 5 Figure 5 is not marked in the figures); and the motor mounting plate 5 and the rear mounting plate 6 are respectively provided with a strip plate structure.

[0032] The electric drive mode of the electric operating mechanism of this chassis truck is as follows: After the overall operating mechanism is installed on the outer wall of the center-mounted switch cabinet, at this time, the threaded rotating shaft (square shaft end) of the switch cabinet is clamped into the square shaft connecting concave block 3 of the switch cabinet. Then, the current-on motor 4 is started to drive the rotation of the DC motor output gear 7, and the DC motor output gear 7 drives the rotation of the transmission spur gear 8. The transmission spur gear 8 drives the rotation of the worm gear 10 through the worm 9. At this time, a set of limit protrusions 22 on the outer wall of one end of the driven member 15 are clamped into the circular limit ring 23 on the driving member 14. When the worm gear 10 rotates, it drives the driving member 14 on the inner wall to rotate. The driving member 14 drives the driven member 15 to rotate. Finally, the driven member 15 drives the threaded rotating shaft (square shaft end) of the switch cabinet in the square shaft connecting concave block 3 of the switch cabinet to rotate.

[0033] The manual drive mode of the electric operating mechanism of this chassis truck is as follows: After the overall operating mechanism is installed on the outer wall of the center-mounted switch cabinet, the groove of the external handle of the cabinet is clamped and limitedly connected with the square convex block 2 for operating the external handle of the cabinet. The threaded rotating shaft (square shaft end) of the switch cabinet is clamped into the square shaft connecting concave block 3 of the switch cabinet. First, by pushing the external handle of the cabinet inward, at this time, a set of limit protrusions 22 on the outer wall of one end of the driven member 15 are disengaged from the circular limit ring 23 on the driving member 14 (the driven member 15 and a set of limit protrusions 22 move inward and disengage from the circular limit ring 23). Then, by rotating the external handle of the cabinet, the driven member 15 and a set of limit protrusions 22 are synchronously rotated to realize the rotational drive of the threaded rotating shaft of the switch cabinet in the square shaft connecting concave block 3 of the switch cabinet. Finally, when the rotational drive is completed, no more inward pressure is applied. At this time, the compression spring 21 pushes the driven member 15 outward in the reverse direction, and a set of limit protrusions 22 on the outer wall of one end of the driven member 15 are re-fixed and limited and locked with the circular limit ring 23 on the driving member 14 (normal electric rotational drive can be carried out).

[0034] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements can still be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. Electric operating mechanism for chassis vehicle, characterized in that: It consists of a housing (1) arranged on the outer wall of the middle part of the medium-mounted switch cabinet body, and a driving component arranged in the housing (1); the driving component includes a motor mounting plate (5), a rear mounting plate (6) arranged at one end inside the housing (1), a motor (4) arranged at the other end inside the housing (1), an outlet gear (7) arranged on the upper surface of the motor mounting plate (5) and connected to the motor (4), a worm (9) with both ends respectively connected to the motor mounting plate (5) and the rear mounting plate (6), a transmission spur gear (8) arranged at one end of the worm (9) and cooperating with the outlet gear (7), a worm wheel (10) arranged between the motor mounting plate (5) and the rear mounting plate (6) and below the worm (9), a driving member (14) arranged on the inner wall of the worm wheel (10), two circular limiting rings (23) symmetrically arranged on the inner wall of one end of the driving member (14), two groups of limiting card slots (24) symmetrically arranged on the circular limiting rings (23), a driven member (15) cooperating with the driving member (14), a group of limiting protrusions (22) arranged on the outer wall of one end of the driven member (15), and a square protrusion (2) for operating the handle outside the cabinet and a concave block (3) for connecting the square shaft of the switch cabinet respectively arranged at both ends of the driven member (15); the electric operating mechanism of the chassis car further includes a front steel sleeve (17) and a rear steel sleeve (18) arranged on both sides of the worm wheel (10), a plain bearing (19) arranged on the driven member (15) and on one side of the rear steel sleeve (18), a spring limiting ring (20) arranged at one end of the driven member (15) and on one side of the concave block (3) for connecting the square shaft of the switch cabinet, and a compression spring (21) arranged on the driven member (15), wherein the plain bearing (19) is installed on the spring limiting ring (20), both ends of the compression spring (21) are respectively connected to the end face of the spring limiting ring (20) and the end face of the driving member (14), and an installation groove for the compression spring (21) is arranged at one end of the driving member (14).

2. The electric operating mechanism for chassis vehicle according to claim 1, characterized in that: The electric operating mechanism of the chassis car further includes a plurality of positioning threaded holes (25) arranged in the housing (1) and cooperating with the medium-mounted switch cabinet body, wherein a through groove cooperating with the concave block (3) for connecting the square shaft of the switch cabinet is arranged in the outer wall of the middle part of the medium-mounted switch cabinet body, and a through groove cooperating with the square protrusion (2) for operating the handle outside the cabinet is arranged in the outer wall of the housing (1).

3. The electric operating mechanism for chassis vehicle according to claim 2, characterized in that: The electric operating mechanism of the chassis car further includes a plurality of motor mounting plate positioning threaded holes (11) and a plurality of rear mounting plate positioning threaded holes (12) respectively arranged on the motor mounting plate (5) and the rear mounting plate (6).

4. The electric operating mechanism for chassis vehicle according to claim 1, characterized in that: The motor (4) is a DC motor.

5. The electric operating mechanism for chassis vehicle according to claim 1, characterized in that: The driving member (14) is arranged as a circular hollow structure, the two groups of limiting card slots (24) are arranged as arc-shaped structures, the driven member (15) is arranged as a cylindrical structure, and a group of limiting protrusions (22) are arranged as arc-shaped structures, wherein the two groups of limiting card slots (24) are respectively larger than the size of a group of limiting protrusions (22).

6. The electric operating mechanism for chassis vehicle according to claim 1, characterized in that: The square shaft connecting concave block (3) of the switch cabinet, the follower (15), and the spring limiting ring (20) are successively decreasing in diameter size.

7. The electric operating mechanism for chassis vehicle according to claim 6, characterized in that: The electric operating mechanism of the chassis truck further includes a through hole (16) of the driving member provided in the driving member (14), wherein the driving member (14) and the worm gear (10) are fixedly connected through the through hole (16) of the driving member by using a positioning screw.

8. The electric operating mechanism for chassis vehicle according to claim 1 or 7, characterized in that: The electric operating mechanism of the chassis truck further includes bearings (13) respectively arranged on the upper side wall end faces of the motor mounting plate (5) and the rear mounting plate (6) and respectively cooperating with the worm (9).

9. The electric operating mechanism for chassis vehicle according to claim 8, characterized in that: The motor mounting plate (5) and the rear mounting plate (6) are respectively arranged as strip plate structures.

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