Electric meter with anti-theft device

Abstract

An electricity meter with an anti-theft device disclosed by the present invention comprises a rear shell, a front cover is hinged to one side of the front end surface of the rear shell, two plugging cylinders are integrally formed on the side wall of the front cover, a moving assembly is fixedly installed on one side, close to the plugging cylinders, of the inner wall of the front cover, the moving assembly comprises a sliding cylinder, and a rotation adjusting assembly is installed in the sliding cylinder. A plurality of fixing claws are fixedly installed on the inner wall of the front cover, a hydraulic assembly is fixedly installed in the fixing claws jointly, and a lock box is fixedly installed on the inner wall of the right side of the rear shell through bolts. A multi-layer protection structure is formed through linkage use of the sliding barrel and the sliding assembly in the front cover, the hydraulic assembly, the lock box and other parts, the hydraulic assembly controls the insertion key to move through internal pressure transmission, the anti-theft function is more reliable, and the device is more convenient to use through the ingenious mechanical structure design. The mechanical anti-theft electricity meter which is compact in structure, safe and reliable is provided by combining various technical means of hydraulic pressure, magnetic attraction, mechanical interlocking and the like.

Description

Technical Field

[0001] The invention relates to the field of anti-theft of electric meters, in particular to an electric meter with an anti-theft device. Background Art

[0002] With the rapid growth of electricity supply and consumption, the efficient utilization and management of power resources have become increasingly important. However, in practical applications, due to illegal operations or malicious behaviors of some users, power metering equipment (such as meters) often face the risk of being damaged, tampered or stolen, which not only causes economic losses to power companies, but also affects the normal operation and management of the power system.

[0003] Traditional electric meters mainly rely on electronic technology to achieve metering and protection functions, such as preventing tampering through encrypted communications, anti-disassembly sensors or alarm functions. However, purely electronic protection measures are often insufficient when facing physical damage, forced interference or illegal disassembly. In addition, some users use physical tools, such as strong magnetic fields or mechanical destruction methods, to try to bypass electronic protection mechanisms and illegally use electricity. In the existing technology, mechanical protection measures for this problem are relatively weak and difficult to deal with effectively. Therefore, designing an electric meter with mechanical anti-theft function can provide additional security at the physical level and achieve more comprehensive anti-theft protection, which has become an urgent need in the current technology field.

[0004] After searching, it was found that the prior art publication number is CN210863846U, which discloses an anti-theft device for an electric meter box in a power grid system, including a box body, a box door, and an anti-theft device. The anti-theft device includes a fixed plate, a mounting plate, a sliding seat, a slide groove, a slider, a limit groove, a through groove, an electromagnet, and a reset mechanism. The beneficial effects of the utility model are as follows: the slider is driven by the reset mechanism to make the card plate engage in the through groove of the fixed plate, so that the box door is locked on the box body. Only when the electromagnet is energized by the remote control platform to generate magnetism and drive the slider to move toward the electromagnet, and then the card plate slides out of the through groove of the fixed plate, can the box door be opened, replacing the mechanical lock in the prior art, and at least to a certain extent, the electric meter box has an anti-theft function.

[0005] Therefore, based on the above search and in combination with the existing technology, an existing power grid system meter box anti-theft device has certain technical defects. For example, when the circuit is powered off, the electromagnet cannot be used and the meter box cannot be opened. If a battery is used instead of a circuit power supply, staff will need to regularly visit the site to replace the battery, which is extremely labor-intensive and resource-intensive. At the same time, the protection effect of this device is insufficient, the protection effect is single, and the anti-theft measures are easily cracked, which cannot meet the market demand for meter anti-theft. Summary of the invention

[0006] The object of the present invention is to provide an electric meter with an anti-theft device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: comprising a rear shell, a front cover is hingedly connected to one side of the front end face of the rear shell, the side wall of the front cover is integrally formed with two plug-in cylinders, a moving component is fixedly installed on one side of the inner wall of the front cover close to the plug-in cylinder, the moving component comprises a slide cylinder, a rotation adjustment component is installed in the slide cylinder, a plurality of fixed claws are fixedly installed on the inner wall of the front cover, a hydraulic component is fixedly installed in the plurality of fixed claws, the claw heads of the fixed claws are made of easily deformable plastic material, the fixed claws have a limiting function on the hydraulic component, and the hydraulic component is convenient for rapid installation and disassembly, and a lock box is fixedly installed on the right inner wall of the rear shell by bolts.

[0008] As a further solution of the present invention, a mounting ring is slidably connected in the slide cylinder, a spring 1 is fixedly mounted on the left end surface of the mounting ring, and a push rod is fixedly mounted on one end of the spring 1 away from the mounting ring.

[0009] As a further solution of the present invention, the outer wall of the mounting ring is integrally formed and symmetrically provided with two sliding arms, the outer wall of the slide tube is symmetrically provided with two sliding grooves, the two sliding arms respectively pass through the two sliding grooves and are welded and fixed with mounting plates, magnets are installed on the right end faces of the two mounting plates, the two magnets respectively correspond to the positions of the two plug-in tubes, and the two magnets are made of aluminum nickel cobalt magnets. Aluminum nickel cobalt magnets have the advantages of good thermal stability, can be used in high temperature environments, are easy to be processed into complex shapes and are not easy to corrode. By inserting the magnet block in the plug-in tube, according to the repulsion of magnetic like poles, the mounting ring, spring 1 and push rod are indirectly driven to move synchronously by pushing the magnet to move.

[0010] As a further solution of the present invention, the rotation adjustment assembly includes a rotation rod, which is rotatably connected in the mounting ring. An adjustment plate is integrally formed on the outer wall of one end of the rotation rod close to spring one. The adjustment plate is inserted between the spring wires of spring one. The adjustment plate is driven to rotate by rotating the rotation rod. The adjustment plate can compress part of the spring wire of spring one, thereby changing the length of spring one. Through calculation, magnets with different magnetic forces required to open the front cover under different lengths of spring one are set. The staff records the length of spring one in a book to facilitate the use of the corresponding magnet during the next meter maintenance.

[0011] The outer wall of the sliding plate is provided with a gear ring, and the outer wall of the sliding plate is provided with a gear ring, and the gear ring is meshed with the gear ring, and the outer wall of the sliding plate is provided with a gear ring.

[0012] As a further scheme of the present invention, the hydraulic component includes a transmission pipe, in which silicone oil is poured. The silicone oil has the following advantages: it is not easy to decompose or volatilize at high temperature, does not freeze or thicken at low temperature, has excellent lubrication performance, low friction coefficient, good surface compatibility with various materials, high dielectric strength, and is an excellent electrical insulating medium. In high temperature, high humidity or harsh environment, silicone oil can still maintain good insulation performance, low vapor pressure, and is not easy to volatilize even at high temperature; a starting cylinder is provided at the right end of the transmission pipe, the right end face of the starting cylinder is abutted against the left end face of the sliding cylinder, a control component is slidably installed in the starting cylinder, and an end cylinder is provided at the left end of the transmission pipe, a piston is slidably installed in the end cylinder, and a sliding column is provided on the top surface of the piston.

[0013] As a further solution of the present invention, a splice key is fixedly installed on the top surface of the sliding column, and a plurality of convex plates of different sizes and lengths are provided on the outer wall of the splice key. The whole body of the splice key is made of metal that is not easily deformed, so as to provide sufficient downward pressure to the piston while ensuring the rigidity of the splice key body. A splice groove corresponding to the size of the plurality of convex plates is provided on the front end surface of the lock box, and a sliding groove is provided inside the lock box.

[0014] As a further scheme of the present invention, a pressure relief cylinder is provided on the side of the transmission pipe close to the starting end cylinder, the height of the pressure relief cylinder is lower than that of the end cylinder, the pressure relief cylinder is connected to the transmission pipe through a connecting pipe, a spring is installed in the connecting pipe, a ball valve is fixedly installed at the bottom end of the spring, an upper convex ring and a lower convex ring are respectively provided on the inner wall of the connecting pipe, the top of the spring is fixedly installed on the bottom surface of the upper convex ring, the spring applies downward pressure on the ball valve, the diameter of the ball valve is smaller than the inner diameter of the connecting pipe, the diameter of the ball valve is larger than the inner diameter of the lower convex ring, the outer wall of the ball valve abuts against the lower convex ring, so that a closed space is formed inside the pressure relief cylinder.

[0015] As a further solution of the present invention, the control component includes piston two, which is slidably connected in the starting end cylinder, the right end face of piston two is abutted against the end of the push rod, an extension plate is provided at the center of the left end face of piston two, a safety cylinder is provided at the end of the extension plate, a safety ejector pin is slidably installed in the safety cylinder, a spring three is sandwiched between the bottom surface of the safety ejector pin and the bottom surface of the safety cylinder, when the push rod pushes piston two to move too much, piston two drives the safety cylinder to the bottom of the pressure relief cylinder, spring three releases the elastic force to drive the safety ejector pin to move upward, the safety ejector pin pushes the ball valve upward, compresses spring two, and connects the internal space of the pressure relief cylinder with the space of the transmission pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the linkage of the sliding cylinder and sliding assembly, hydraulic assembly and lock box in the front cover, a multi-level protection structure is formed. By inserting a magnet block in the plug-in cylinder, the push rod is indirectly driven to move synchronously by pushing the magnet to move according to the repulsion of the same poles of magnetism. The push rod applies pressure to one end of the hydraulic assembly, and the hydraulic assembly controls the movement of the plug key through internal pressure transmission, making the anti-theft function more reliable;

[0018] 2. The rotating adjustment component is combined with the rotating rod and the adjusting plate, and the active gear is driven to rotate by rotating the torsion block, which indirectly drives the gear ring and the rotating disk to rotate. The rotating disk drives the rotating rod to rotate synchronously through the sliding rod, and the rotating rod drives the adjusting plate to rotate, so as to adjust the length of the spring, thereby realizing the precise control of the spring length. Then, through the close cooperation between the plug-in key and the lock box, the plug-in key can only be disengaged from the lock box and the meter cover can be opened when it rises to a certain height, thereby improving the practicality of the meter lock and reducing the possibility of opening with general tools or violence;

[0019] 3. By providing a pressure relief cylinder, a spring and a ball valve structure in the hydraulic component, and providing a safety ejector pin and a spring structure in the control component, when the push rod pushes the piston 2 to move too much, the internal space of the pressure relief cylinder is connected with the transmission pipe, and the silicone oil in the transmission pipe enters the pressure relief cylinder first, so that non-staff cannot use a magnet with huge magnetic force to unlock the door, thereby further enhancing the anti-theft safety performance. The present invention provides a compact, safe and reliable mechanical anti-theft electric meter through ingenious mechanical structure design combined with various technical means such as hydraulics, magnetic attraction and mechanical interlocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a front view of the overall structure of the present invention;

[0022] Figure 3 It is an exploded view of the overall structure of the present invention;

[0023] Figure 4 The local structure explosion of the present invention Figure 1 ;

[0024] Figure 5 An exploded view of the rotation adjustment assembly structure of the present invention;

[0025] Figure 6 The local structure explosion of the present invention Figure 2 ;

[0026] Figure 7 It is an exploded view of the control component structure of the present invention;

[0027] Figure 8 It is the working state diagram of the overall structure of the present invention;

[0028] Fig. 9 It is a cross-sectional view of the overall structure of the present invention;

[0029] Fig.10 The local structure of the present invention is cut away Figure 1 ;

[0030] Fig.11 The local structure of the present invention is cut away Figure 2 ;

[0031] Fig.12 The local structure of the present invention is cut away Figure 3 .

[0032] In the figure: 1, rear housing; 11, extension arm; 2, front cover; 21, plug-in tube; 22, mounting arm; 23, card slot; 24, display screen;

[0033] 3. Moving assembly; 31. Slide; 311. Slide groove; 312. Limit rail; 313. Exposure groove; 32. Mounting ring; 321. Mounting plate; 33. Spring 1; 34. Push rod; 35. Magnet; 351. Shielding cylinder;

[0034] 4. Rotation adjustment assembly; 41. Rotation rod; 411. Rotation ring; 412. Adjustment plate; 413. Plug hole; 42. Sliding rod; 421. Rotation disk; 422. Limiting ring; 43. Gear ring; 44. Driving gear; 45. Torsion block;

[0035] 5. Hydraulic assembly; 51. Transmission pipe; 52. Start cylinder; 53. End cylinder; 54. Pressure relief cylinder; 55. Piston 1; 551. Sealing ring 1; 552. Sliding column; 56. Plug key; 57. Spring 2; 58. Ball valve;

[0036] 6. Control assembly; 61. Piston 2; 62. Sealing ring 2; 611. Extension plate; 612. Safety cylinder; 63. Spring 3; 64. Safety ejector pin;

[0037] 7. Fixed claw;

[0038] 8. Lock box; 81. Plug-in slot; 82. Sliding slot; 83. Fixed arm. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1: Please refer to Figures 1 to 12 , an electric meter with an anti-theft device, comprising a rear shell 1, a front cover 2 is hingedly connected to one side of the front end face of the rear shell 1, specifically, the rear shell 1 and the front cover 2 are made of reinforced plastic throughout, and extension arms 11 are provided at the four corners of the rear end face of the rear shell 1, and the extension arms 11 are provided with connection holes, and bolts are passed through the connection holes to be fixedly connected to the wall, so that the rear shell 1 is fixedly installed on the wall surface, and the side wall of the front cover 2 is integrally formed with two plug-in barrels 21, specifically, the plug-in barrel 21 is used to plug in the magnet block, and the outer wall of the front cover 2 is provided with a card slot 23 and a display Display screen 24, a moving component 3 is fixedly installed on one side of the inner wall of the front cover 2 close to the plug-in cylinder 21, the moving component 3 includes a slide cylinder 31, and a rotation adjustment component 4 is installed in the slide cylinder 31, a plurality of fixed claws 7 are fixedly installed on the inner wall of the front cover 2, and a hydraulic component 5 is fixedly installed in the plurality of fixed claws 7. Specifically, the claw heads of the fixed claws 7 are made of easily deformable plastic material, and the fixed claws 7 have a limiting function on the hydraulic component 5, which facilitates the rapid installation and disassembly of the hydraulic component 5, and a lock box 8 is fixedly installed on the right inner wall of the rear shell 1 by bolts.

[0041] See also Figure 3 , Figure 4The slide cylinder 31 is slidably connected with a mounting ring 32, and a spring 33 is fixedly installed on the left end surface of the mounting ring 32. A push rod 34 is fixedly installed on the end of the spring 33 away from the mounting ring 32. Specifically, a circular slider is integrally formed on the right end surface of the push rod 34, and the right end surface of the circular slider is fixedly connected to the spring 33. The circular slider is slidably connected to the slide cylinder 31, and the inner wall of the slide cylinder 31 has a guiding effect on the circular slider. The outer wall of the mounting ring 32 is integrally formed with two sliding arms symmetrically provided, and two sliding grooves 311 are symmetrically opened on the outer wall of the slide cylinder 31. The two sliding arms pass through the two sliding grooves 311 respectively and are welded and fixed with a mounting plate 321. Specifically, the size of the sliding arm is adapted to the size of the sliding groove 311, and the sliding groove 311 has a limiting and guiding effect on the sliding arm. Magnets are installed on the right end surfaces of the two mounting plates 321 35, the two magnets 35 correspond to the positions of the two plug-in cylinders 21 respectively. Specifically, the two magnets 35 are both made of aluminum nickel cobalt magnets. The aluminum nickel cobalt magnet has the advantages of good thermal stability, can be used in high temperature environment, easy to be processed into complex shapes and not easy to corrode. The right end faces of the two mounting plates 321 are fixedly installed with shielding cylinders 351. The two magnets 35 are respectively fixedly installed in the two shielding cylinders 351. The shielding cylinders 351 can shield the magnetic force of the magnets 35 and reduce the influence of the magnets 35 on the internal components of the meter. The right end of the shielding cylinder 351 is open, so that the magnetism of the magnet 35 is released only toward the plug-in cylinder 21. By plugging the magnet block into the plug-in cylinder 21, according to the magnetic repulsion of the same poles, the magnet 35 is pushed to move, which indirectly drives the mounting ring 32, the spring 1 33 and the push rod 34 to move synchronously.

[0042] See also Figure 3 to Figure 5 The rotation adjustment assembly 4 includes a rotation rod 41, and the rotation rod 41 is rotatably connected in the mounting ring 32. Specifically, a rotation ring 411 is provided in the middle of the outer wall of the rotation rod 41, and an annular groove is provided in the mounting ring 32. The rotation ring 411 is rotatably connected in the annular groove. The annular groove has a limiting effect on the rotation ring 411. When the mounting ring 32 moves in the slide cylinder 31, the rotation rod 41 is driven to move synchronously. An adjustment plate 412 is integrally formed on the outer wall of one end of the rotation rod 41 close to the spring 1 33. The adjustment plate 412 is inserted between the spring wires of the spring 1 33. For details, please refer to Fig.10The adjusting plate 412 is driven to rotate by rotating the rotating rod 41. The adjusting plate 412 can compress part of the spring wire of the spring 33, so as to change the length of the spring 33. The right end face of the rotating rod 41 is provided with a plug hole 413, and a slide bar 42 is slidably plugged into the plug hole 413. Specifically, a groove is provided on the inner wall of the plug hole 413, and a convex strip is provided on the outer wall of the slide bar 42. The convex strip is slidably connected in the groove. The groove has a limiting and guiding effect on the convex strip. When the slide bar 42 rotates, it can drive the rotating rod 41 to rotate simultaneously. The right end of the slide rod 42 is coaxially welded with a rotating disk 421, and the rotating disk 421 is rotatably connected and installed on the right end of the slide cylinder 31. Specifically, the right end of the slide cylinder 31 is provided with a limiting rail 312, and the outer wall of the rotating disk 421 is provided with a limiting ring 422, and the limiting ring 422 is rotatably connected in the limiting rail 312. The limiting rail 312 has a limiting effect on the limiting ring 422. The limiting rail 312 is used to prevent the rotating disk 421 from slipping off. The outer wall of the rotating disk 421 is coaxially fixed with a gear ring 43, please refer to Figure 3 The inner wall of the front cover 2 is provided with a mounting arm 22, and the end of the mounting arm 22 is rotatably connected with a driving gear 44. The rotating shaft of the driving gear 44 passes through the mounting arm 22 and is coaxially fixedly connected with a torsion block 45. The driving gear 44 is meshed and transmitted with the gear ring 43. Specifically, rubber strips for increasing friction are equidistantly bonded to the outer wall of the torsion block 45. The driving gear 44 is driven to rotate by rotating the torsion block 45, and the gear ring 43 and the rotating disk 421 are indirectly driven to rotate. The rotating disk 421 drives the rotating rod 41 to rotate through the sliding rod 42, and the rotating rod 41 drives the adjusting plate 412 to rotate. The adjusting plate 412 compresses or releases part of the spring wire of the spring 33, thereby changing the length of the spring 33. The outer wall of the slide cylinder 31 is provided with a revealing groove 313, and the revealing groove 313 is used to facilitate the staff to observe the length of the spring 33.

[0043] Example 2: Please refer to Figure 6 to Figure 12, an electric meter with an anti-theft device, which is different from the embodiment 1 in that the hydraulic component 5 includes a transmission tube 51, a starting tube 52 is provided at the right end of the transmission tube 51, the right end surface of the starting tube 52 abuts against the left end surface of the sliding tube 31, a control component 6 is slidably installed in the starting tube 52, a terminal tube 53 is provided at the left end of the transmission tube 51, a piston 55 is slidably installed in the terminal tube 53, specifically, the transmission tube 51 is filled with silicone oil, which has the following advantages: it is not easy to decompose or volatilize at high temperature, it does not freeze or thicken at low temperature, it has excellent lubrication performance, low friction coefficient, good compatibility with the surface of various materials, high dielectric strength, and is an excellent electrical insulating medium. In high temperature, high humidity or harsh environment, silicone oil can still maintain good insulation performance, low vapor pressure, and is not easy to volatilize even at high temperature. The outer wall of the piston 55 and the terminal tube 5 A sealing ring 551 is sandwiched between the inner walls of the piston 55, and the sealing ring 551 is used to improve the sealing performance of the piston 55. A sliding column 552 is provided on the top surface of the piston 55. Specifically, the sliding column 552 is a rectangular column. A square hole is provided on the top surface of the end tube 53. The square hole has a limiting effect on the sliding column 552. The square hole is used to prevent the sliding column 552 from rotating in the end tube 53. A plug-in key 56 is fixedly installed on the top surface of the sliding column 552. The outer wall of the plug-in key 56 is provided with a plurality of convex plates of different sizes and lengths. Specifically, the plug-in key 56 is made of a metal that is not easy to deform, and the rigidity of the plug-in key 56 body is ensured while providing sufficient downward pressure to the piston 55. The front end surface of the lock box 8 is provided with a plug-in groove 81 corresponding to the size of the plurality of convex plates, and a sliding groove 82 is provided inside the lock box 8. For details, please refer to Fig.12 The convex plate on the outer wall of the plug key 56 passes through the plug slot 81 of the lock box 8 and enters the sliding slot 82. The plug key 56 can move freely up and down in the lock box 8. The lock box 8 is fixedly mounted on the inner wall of the rear shell 1 through the fixed arm 83.

[0044] Example 3: Please refer to Figure 6 , Figure 7 , Fig.11 , an electric meter with an anti-theft device, which is different from Example 1 in that a pressure relief cylinder 54 is provided on one side of a transmission tube 51 close to a starting cylinder 52, and the height of the pressure relief cylinder 54 is lower than that of the terminal cylinder 53. The pressure relief cylinder 54 is connected to the transmission tube 51 through a connecting tube, and a spring 57 is installed in the connecting tube. A ball valve 58 is fixedly installed at the bottom end of the spring 57. Specifically, an upper convex ring and a lower convex ring are respectively provided on the inner wall of the connecting tube, and the top of the spring 57 is fixedly installed on the bottom surface of the upper convex ring. The spring 57 applies downward pressure to the ball valve 58. The diameter of the ball valve 58 is smaller than the inner diameter of the connecting tube, and the diameter of the ball valve 58 is larger than the inner diameter of the lower convex ring. The outer wall of the ball valve 58 abuts against the lower convex ring, so that a closed space is formed inside the pressure relief cylinder 54.

[0045] The control assembly 6 includes a second piston 61, which is slidably connected in the starting end tube 52. Specifically, a second sealing ring 62 is sandwiched between the outer wall of the second piston 61 and the inner wall of the starting end tube 52. The second sealing ring 62 is used to improve the sealing performance of the second piston 61. The right end surface of the second piston 61 abuts against the end of the push rod 34. An extension plate 611 is provided at the center of the left end surface of the second piston 61. A safety cylinder 612 is provided at the end of the extension plate 611. A safety ejector pin 64 is slidably installed in the safety cylinder 612. A spring 3 63 is sandwiched between the bottom surface of the safety ejector pin 64 and the inner bottom surface of the safety cylinder 612. For details, please refer to Fig.11 When the push rod 34 pushes the piston 2 61 to move too much, the piston 2 61 drives the safety cylinder 612 to the bottom of the pressure relief cylinder 54, and the spring 3 63 releases the elastic force to drive the safety ejector pin 64 to move upward. The safety ejector pin 64 pushes the ball valve 58 upward, compressing the spring 2 57, and connecting the internal space of the pressure relief cylinder 54 with the transmission pipe 51. Since the height of the pressure relief cylinder 54 is lower than the end cylinder 53, the silicone oil in the transmission pipe 51 enters the pressure relief cylinder 54 first until the pressure relief cylinder 54 is full, so that non-staff cannot use the magnet with huge magnetic force to unlock the lock.

[0046] The working principle of the present invention is: when the front cover 2 needs to be opened, a magnet block is inserted into the plug-in tube 21. According to the principle of magnetic repulsion of like poles, the magnet block pushes the magnet 35 to move. The movement of the magnet 35 indirectly drives the mounting ring 32, the spring 1 33 and the push rod 34 to move synchronously. The push rod 34 drives the piston 2 61 to move in the starting tube 52. The piston 2 61 transmits the silicone oil in the starting tube 52 to the terminal tube 53 through the transmission tube 51. The silicone oil pushes the piston 1 55 in the terminal tube 53 to move upward. The piston 1 55 drives the plug-in key 56 to move in the sliding groove 82 of the lock box 8 through the sliding column 552 until the convex plate on the outer wall of the plug-in key 56 corresponds to the tooth position of the plug-in groove 81 of the lock box 8, thereby rotating to open the front cover 2;

[0047] When the staff has finished the maintenance, in order to increase the safety of the electric meter, the length of the spring 33 is adjusted to change the magnetic force of the magnet required to open the front cover 2, and the active gear 44 is driven to rotate by rotating the torsion block 45, which indirectly drives the gear ring 43 and the rotating disk 421 to rotate, and the rotating disk 421 drives the rotating rod 41 to rotate through the sliding rod 42, and the rotating rod 41 drives the adjusting plate 412 to rotate, and the adjusting plate 412 compresses or releases part of the spring wire of the spring 33 to change the length of the spring 33. The outer wall of the slide 31 is provided with a revealing groove 313, and the revealing groove 313 is used for the staff to observe the length of the spring 33. Through calculation, the staff can set the magnets with different magnetic forces required to open the front cover 2 under the conditions of different lengths of the spring 33. The staff records the length of the spring 33 in the book, so that the corresponding magnet can be used when the electric meter is repaired next time.

[0048] The device still has certain hidden dangers when working in the above manner. For example, non-staff members can use a magnet with huge magnetic force to push the plug key 56 to the top of the sliding groove 82 of the lock box 8, and slowly pull out the magnet to reduce the repulsive force between the magnet and the magnet 35 so that the plug key 56 slowly falls in the sliding groove 82 of the lock box 8, while continuously applying a rotational force to the front cover 2, so as to achieve the purpose of unlocking. In view of this situation, a safety device is installed in the hydraulic assembly 5. When the push rod 34 pushes the piston 2 61 to move too much, the piston 2 61 drives the safety cylinder 612 to the bottom of the pressure relief cylinder 54. Spring three 63 releases the elastic force to drive the safety ejector pin 64 to move upward, and the safety ejector pin 64 pushes the ball valve 58 upward, compressing the spring two 57, connecting the internal space of the pressure relief cylinder 54 with the transmission pipe 51. Since the height of the pressure relief cylinder 54 is lower than the end cylinder 53, the silicone oil in the transmission pipe 51 preferentially enters the pressure relief cylinder 54 until the pressure relief cylinder 54 is full. Since the amount of silicone oil in the transmission pipe 51 is constant, the plug-in key 56 cannot reach the predetermined height, so that non-staff cannot use the magnet with huge magnetic force to unlock the door, thereby further enhancing the anti-theft safety performance. At this point, the device is completed.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric meter with an anti-theft device, comprising a rear housing (1), characterized in that: A front cover (2) is hingedly connected to one side of the front end surface of the rear shell (1); the side wall of the front cover (2) is integrally formed with two plug-in cylinders (21); a moving assembly (3) is fixedly installed on the inner wall of the front cover (2) close to the plug-in cylinder (21); the moving assembly (3) includes a slide cylinder (31); a rotation adjustment assembly (4) is installed in the slide cylinder (31); a plurality of fixed claws (7) are fixedly installed on the inner wall of the front cover (2); a hydraulic assembly (5) is fixedly installed in the plurality of fixed claws (7); and a lock box (8) is fixedly installed on the right inner wall of the rear shell (1) by bolts.

2. The electric meter with an anti-theft device according to claim 1, characterized in that: A mounting ring (32) is slidably connected inside the slide cylinder (31), a spring 1 (33) is fixedly mounted on the left end surface of the mounting ring (32), and a push rod (34) is fixedly mounted on one end of the spring 1 (33) away from the mounting ring (32).

3. The electric meter with an anti-theft device according to claim 2, characterized in that: The outer wall of the mounting ring (32) is integrally formed with two sliding arms symmetrically provided thereon, and the outer wall of the slide cylinder (31) is symmetrically provided with two sliding grooves (311), and the two sliding arms respectively pass through the two sliding grooves (311) and are then welded and fixed with mounting plates (321), and magnets (35) are both installed on the right end surfaces of the two mounting plates (321), and the two magnets (35) respectively correspond to the positions of the two plug-in cylinders (21).

4. The electric meter with an anti-theft device according to claim 3, characterized in that: The rotation adjustment assembly (4) comprises a rotation rod (41), the rotation rod (41) being rotationally connected in the mounting ring (32), and an adjustment plate (412) being integrally formed on the outer wall of one end of the rotation rod (41) close to the spring one (33), and the adjustment plate (412) being inserted between the spring wires of the spring one (33).

5. The electric meter with anti-theft device according to claim 4, characterized in that: The right end surface of the rotating rod (41) is provided with an inserting hole (413), a sliding rod (42) is slidably inserted in the inserting hole (413), a rotating disk (421) is coaxially welded and fixed to the right end of the sliding rod (42), the rotating disk (421) is rotatably connected and installed on the right end of the sliding cylinder (31), a gear ring (43) is coaxially fixedly installed on the outer wall of the rotating disk (421), a mounting arm (22) is provided on the inner wall of the front cover (2), a driving gear (44) is rotatably connected to the end of the mounting arm (22), a rotating shaft of the driving gear (44) passes through the mounting arm (22) and is coaxially fixedly connected to a torsion block (45), and the driving gear (44) is meshed and transmission-connected with the gear ring (43).

6. The electric meter with an anti-theft device according to claim 1, characterized in that: The hydraulic assembly (5) comprises a transmission pipe (51), a starting end tube (52) is provided at the right end of the transmission pipe (51), the right end surface of the starting end tube (52) is in contact with the left end surface of the slide tube (31), a control assembly (6) is slidably installed in the starting end tube (52), an end tube (53) is provided at the left end of the transmission pipe (51), a piston (55) is slidably installed in the end tube (53), and a sliding column (552) is provided on the top surface of the piston (55).

7. An electric meter with an anti-theft device according to claim 6, characterized in that: A plug-in key (56) is fixedly mounted on the top surface of the sliding column (552), and the outer wall of the plug-in key (56) is provided with a plurality of convex plates of different sizes and lengths. The front end surface of the lock box (8) is provided with a plug-in groove (81) corresponding to the size of the plurality of convex plates, and a sliding groove (82) is provided inside the lock box (8).

8. The electric meter with an anti-theft device according to claim 6, characterized in that: A pressure relief cylinder (54) is provided on one side of the transmission pipe (51) close to the starting cylinder (52). The height of the pressure relief cylinder (54) is lower than that of the terminal cylinder (53). The pressure relief cylinder (54) is connected to the transmission pipe (51) via a connecting pipe. A second spring (57) is installed in the connecting pipe. A ball valve (58) is fixedly installed at the bottom end of the second spring (57).

9. The electric meter with an anti-theft device according to claim 6, characterized in that: The control assembly (6) comprises a second piston (61), the second piston (61) being slidably connected in the starting end tube (52), the right end surface of the second piston (61) being in contact with the end of the push rod (34), an extension plate (611) being provided at the center of the left end surface of the second piston (61), a safety cylinder (612) being provided at the end of the extension plate (611), a safety ejector pin (64) being slidably installed in the safety cylinder (612), and a third spring (63) being sandwiched between the bottom surface of the safety ejector pin (64) and the inner bottom surface of the safety cylinder (612).

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